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e8689e63 LW |
1 | /* |
2 | * Copyright (c) 2006 ARM Ltd. | |
3 | * Copyright (c) 2010 ST-Ericsson SA | |
4 | * | |
5 | * Author: Peter Pearse <peter.pearse@arm.com> | |
6 | * Author: Linus Walleij <linus.walleij@stericsson.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the Free | |
10 | * Software Foundation; either version 2 of the License, or (at your option) | |
11 | * any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
16 | * more details. | |
17 | * | |
94ae8522 RKAL |
18 | * The full GNU General Public License is in this distribution in the file |
19 | * called COPYING. | |
e8689e63 LW |
20 | * |
21 | * Documentation: ARM DDI 0196G == PL080 | |
94ae8522 | 22 | * Documentation: ARM DDI 0218E == PL081 |
da1b6c05 | 23 | * Documentation: S3C6410 User's Manual == PL080S |
e8689e63 | 24 | * |
94ae8522 RKAL |
25 | * PL080 & PL081 both have 16 sets of DMA signals that can be routed to any |
26 | * channel. | |
e8689e63 LW |
27 | * |
28 | * The PL080 has 8 channels available for simultaneous use, and the PL081 | |
29 | * has only two channels. So on these DMA controllers the number of channels | |
30 | * and the number of incoming DMA signals are two totally different things. | |
31 | * It is usually not possible to theoretically handle all physical signals, | |
32 | * so a multiplexing scheme with possible denial of use is necessary. | |
33 | * | |
34 | * The PL080 has a dual bus master, PL081 has a single master. | |
35 | * | |
da1b6c05 TF |
36 | * PL080S is a version modified by Samsung and used in S3C64xx SoCs. |
37 | * It differs in following aspects: | |
38 | * - CH_CONFIG register at different offset, | |
39 | * - separate CH_CONTROL2 register for transfer size, | |
40 | * - bigger maximum transfer size, | |
41 | * - 8-word aligned LLI, instead of 4-word, due to extra CCTL2 word, | |
42 | * - no support for peripheral flow control. | |
43 | * | |
e8689e63 LW |
44 | * Memory to peripheral transfer may be visualized as |
45 | * Get data from memory to DMAC | |
46 | * Until no data left | |
47 | * On burst request from peripheral | |
48 | * Destination burst from DMAC to peripheral | |
49 | * Clear burst request | |
50 | * Raise terminal count interrupt | |
51 | * | |
52 | * For peripherals with a FIFO: | |
53 | * Source burst size == half the depth of the peripheral FIFO | |
54 | * Destination burst size == the depth of the peripheral FIFO | |
55 | * | |
56 | * (Bursts are irrelevant for mem to mem transfers - there are no burst | |
57 | * signals, the DMA controller will simply facilitate its AHB master.) | |
58 | * | |
59 | * ASSUMES default (little) endianness for DMA transfers | |
60 | * | |
9dc2c200 RKAL |
61 | * The PL08x has two flow control settings: |
62 | * - DMAC flow control: the transfer size defines the number of transfers | |
63 | * which occur for the current LLI entry, and the DMAC raises TC at the | |
64 | * end of every LLI entry. Observed behaviour shows the DMAC listening | |
65 | * to both the BREQ and SREQ signals (contrary to documented), | |
66 | * transferring data if either is active. The LBREQ and LSREQ signals | |
67 | * are ignored. | |
68 | * | |
69 | * - Peripheral flow control: the transfer size is ignored (and should be | |
70 | * zero). The data is transferred from the current LLI entry, until | |
71 | * after the final transfer signalled by LBREQ or LSREQ. The DMAC | |
da1b6c05 | 72 | * will then move to the next LLI entry. Unsupported by PL080S. |
e8689e63 | 73 | */ |
730404ac | 74 | #include <linux/amba/bus.h> |
e8689e63 LW |
75 | #include <linux/amba/pl08x.h> |
76 | #include <linux/debugfs.h> | |
0c38d701 VK |
77 | #include <linux/delay.h> |
78 | #include <linux/device.h> | |
79 | #include <linux/dmaengine.h> | |
80 | #include <linux/dmapool.h> | |
8516f52f | 81 | #include <linux/dma-mapping.h> |
6d05c9fa | 82 | #include <linux/export.h> |
0c38d701 VK |
83 | #include <linux/init.h> |
84 | #include <linux/interrupt.h> | |
85 | #include <linux/module.h> | |
aa4734da LW |
86 | #include <linux/of.h> |
87 | #include <linux/of_dma.h> | |
b7b6018b | 88 | #include <linux/pm_runtime.h> |
e8689e63 | 89 | #include <linux/seq_file.h> |
0c38d701 | 90 | #include <linux/slab.h> |
3a95b9fb | 91 | #include <linux/amba/pl080.h> |
e8689e63 | 92 | |
d2ebfb33 | 93 | #include "dmaengine.h" |
01d8dc64 | 94 | #include "virt-dma.h" |
d2ebfb33 | 95 | |
e8689e63 LW |
96 | #define DRIVER_NAME "pl08xdmac" |
97 | ||
ea524c7e MB |
98 | #define PL80X_DMA_BUSWIDTHS \ |
99 | BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \ | |
100 | BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ | |
101 | BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ | |
102 | BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | |
103 | ||
7703eac9 | 104 | static struct amba_driver pl08x_amba_driver; |
b23f204c | 105 | struct pl08x_driver_data; |
7703eac9 | 106 | |
e8689e63 | 107 | /** |
94ae8522 | 108 | * struct vendor_data - vendor-specific config parameters for PL08x derivatives |
da7cbd20 | 109 | * @config_offset: offset to the configuration register |
e8689e63 | 110 | * @channels: the number of channels available in this variant |
f9cd4761 | 111 | * @signals: the number of request signals available from the hardware |
94ae8522 | 112 | * @dualmaster: whether this version supports dual AHB masters or not. |
affa115e LW |
113 | * @nomadik: whether the channels have Nomadik security extension bits |
114 | * that need to be checked for permission before use and some registers are | |
115 | * missing | |
da1b6c05 TF |
116 | * @pl080s: whether this version is a PL080S, which has separate register and |
117 | * LLI word for transfer size. | |
f9cd4761 LW |
118 | * @max_transfer_size: the maximum single element transfer size for this |
119 | * PL08x variant. | |
e8689e63 LW |
120 | */ |
121 | struct vendor_data { | |
d86ccea7 | 122 | u8 config_offset; |
e8689e63 | 123 | u8 channels; |
f9cd4761 | 124 | u8 signals; |
e8689e63 | 125 | bool dualmaster; |
affa115e | 126 | bool nomadik; |
da1b6c05 | 127 | bool pl080s; |
5110e51d | 128 | u32 max_transfer_size; |
e8689e63 LW |
129 | }; |
130 | ||
b23f204c RK |
131 | /** |
132 | * struct pl08x_bus_data - information of source or destination | |
133 | * busses for a transfer | |
134 | * @addr: current address | |
135 | * @maxwidth: the maximum width of a transfer on this bus | |
136 | * @buswidth: the width of this bus in bytes: 1, 2 or 4 | |
137 | */ | |
138 | struct pl08x_bus_data { | |
139 | dma_addr_t addr; | |
140 | u8 maxwidth; | |
141 | u8 buswidth; | |
142 | }; | |
143 | ||
1c38b289 AP |
144 | #define IS_BUS_ALIGNED(bus) IS_ALIGNED((bus)->addr, (bus)->buswidth) |
145 | ||
b23f204c RK |
146 | /** |
147 | * struct pl08x_phy_chan - holder for the physical channels | |
148 | * @id: physical index to this channel | |
da7cbd20 LW |
149 | * @base: memory base address for this physical channel |
150 | * @reg_config: configuration address for this physical channel | |
b23f204c | 151 | * @lock: a lock to use when altering an instance of this struct |
b23f204c RK |
152 | * @serving: the virtual channel currently being served by this physical |
153 | * channel | |
ad0de2ac RK |
154 | * @locked: channel unavailable for the system, e.g. dedicated to secure |
155 | * world | |
b23f204c RK |
156 | */ |
157 | struct pl08x_phy_chan { | |
158 | unsigned int id; | |
159 | void __iomem *base; | |
d86ccea7 | 160 | void __iomem *reg_config; |
b23f204c | 161 | spinlock_t lock; |
b23f204c | 162 | struct pl08x_dma_chan *serving; |
ad0de2ac | 163 | bool locked; |
b23f204c RK |
164 | }; |
165 | ||
166 | /** | |
167 | * struct pl08x_sg - structure containing data per sg | |
168 | * @src_addr: src address of sg | |
169 | * @dst_addr: dst address of sg | |
170 | * @len: transfer len in bytes | |
171 | * @node: node for txd's dsg_list | |
172 | */ | |
173 | struct pl08x_sg { | |
174 | dma_addr_t src_addr; | |
175 | dma_addr_t dst_addr; | |
176 | size_t len; | |
177 | struct list_head node; | |
178 | }; | |
179 | ||
180 | /** | |
181 | * struct pl08x_txd - wrapper for struct dma_async_tx_descriptor | |
01d8dc64 | 182 | * @vd: virtual DMA descriptor |
b23f204c | 183 | * @dsg_list: list of children sg's |
b23f204c RK |
184 | * @llis_bus: DMA memory address (physical) start for the LLIs |
185 | * @llis_va: virtual memory address start for the LLIs | |
186 | * @cctl: control reg values for current txd | |
187 | * @ccfg: config reg values for current txd | |
18536134 RK |
188 | * @done: this marks completed descriptors, which should not have their |
189 | * mux released. | |
3b24c20b | 190 | * @cyclic: indicate cyclic transfers |
b23f204c RK |
191 | */ |
192 | struct pl08x_txd { | |
01d8dc64 | 193 | struct virt_dma_desc vd; |
b23f204c | 194 | struct list_head dsg_list; |
b23f204c | 195 | dma_addr_t llis_bus; |
ba6785ff | 196 | u32 *llis_va; |
b23f204c RK |
197 | /* Default cctl value for LLIs */ |
198 | u32 cctl; | |
199 | /* | |
200 | * Settings to be put into the physical channel when we | |
201 | * trigger this txd. Other registers are in llis_va[0]. | |
202 | */ | |
203 | u32 ccfg; | |
18536134 | 204 | bool done; |
3b24c20b | 205 | bool cyclic; |
b23f204c RK |
206 | }; |
207 | ||
208 | /** | |
8ee1bdc5 | 209 | * enum pl08x_dma_chan_state - holds the PL08x specific virtual channel |
b23f204c RK |
210 | * states |
211 | * @PL08X_CHAN_IDLE: the channel is idle | |
212 | * @PL08X_CHAN_RUNNING: the channel has allocated a physical transport | |
213 | * channel and is running a transfer on it | |
214 | * @PL08X_CHAN_PAUSED: the channel has allocated a physical transport | |
215 | * channel, but the transfer is currently paused | |
216 | * @PL08X_CHAN_WAITING: the channel is waiting for a physical transport | |
217 | * channel to become available (only pertains to memcpy channels) | |
218 | */ | |
219 | enum pl08x_dma_chan_state { | |
220 | PL08X_CHAN_IDLE, | |
221 | PL08X_CHAN_RUNNING, | |
222 | PL08X_CHAN_PAUSED, | |
223 | PL08X_CHAN_WAITING, | |
224 | }; | |
225 | ||
226 | /** | |
227 | * struct pl08x_dma_chan - this structure wraps a DMA ENGINE channel | |
01d8dc64 | 228 | * @vc: wrappped virtual channel |
b23f204c | 229 | * @phychan: the physical channel utilized by this channel, if there is one |
b23f204c RK |
230 | * @name: name of channel |
231 | * @cd: channel platform data | |
da7cbd20 | 232 | * @cfg: slave configuration |
b23f204c | 233 | * @at: active transaction on this channel |
b23f204c RK |
234 | * @host: a pointer to the host (internal use) |
235 | * @state: whether the channel is idle, paused, running etc | |
236 | * @slave: whether this channel is a device (slave) or for memcpy | |
ad0de2ac | 237 | * @signal: the physical DMA request signal which this channel is using |
5e2479bd | 238 | * @mux_use: count of descriptors using this DMA request signal setting |
b23f204c RK |
239 | */ |
240 | struct pl08x_dma_chan { | |
01d8dc64 | 241 | struct virt_dma_chan vc; |
b23f204c | 242 | struct pl08x_phy_chan *phychan; |
550ec36f | 243 | const char *name; |
f9cd4761 | 244 | struct pl08x_channel_data *cd; |
ed91c13d | 245 | struct dma_slave_config cfg; |
b23f204c | 246 | struct pl08x_txd *at; |
b23f204c RK |
247 | struct pl08x_driver_data *host; |
248 | enum pl08x_dma_chan_state state; | |
249 | bool slave; | |
ad0de2ac | 250 | int signal; |
5e2479bd | 251 | unsigned mux_use; |
b23f204c RK |
252 | }; |
253 | ||
e8689e63 LW |
254 | /** |
255 | * struct pl08x_driver_data - the local state holder for the PL08x | |
256 | * @slave: slave engine for this instance | |
257 | * @memcpy: memcpy engine for this instance | |
258 | * @base: virtual memory base (remapped) for the PL08x | |
259 | * @adev: the corresponding AMBA (PrimeCell) bus entry | |
260 | * @vd: vendor data for this PL08x variant | |
261 | * @pd: platform data passed in from the platform/machine | |
262 | * @phy_chans: array of data for the physical channels | |
263 | * @pool: a pool for the LLI descriptors | |
3e27ee84 VK |
264 | * @lli_buses: bitmask to or in to LLI pointer selecting AHB port for LLI |
265 | * fetches | |
30749cb4 | 266 | * @mem_buses: set to indicate memory transfers on AHB2. |
da7cbd20 | 267 | * @lli_words: how many words are used in each LLI item for this variant |
e8689e63 LW |
268 | */ |
269 | struct pl08x_driver_data { | |
270 | struct dma_device slave; | |
271 | struct dma_device memcpy; | |
272 | void __iomem *base; | |
273 | struct amba_device *adev; | |
f96ca9ec | 274 | const struct vendor_data *vd; |
e8689e63 LW |
275 | struct pl08x_platform_data *pd; |
276 | struct pl08x_phy_chan *phy_chans; | |
277 | struct dma_pool *pool; | |
30749cb4 RKAL |
278 | u8 lli_buses; |
279 | u8 mem_buses; | |
ba6785ff | 280 | u8 lli_words; |
e8689e63 LW |
281 | }; |
282 | ||
283 | /* | |
284 | * PL08X specific defines | |
285 | */ | |
286 | ||
ba6785ff TF |
287 | /* The order of words in an LLI. */ |
288 | #define PL080_LLI_SRC 0 | |
289 | #define PL080_LLI_DST 1 | |
290 | #define PL080_LLI_LLI 2 | |
291 | #define PL080_LLI_CCTL 3 | |
da1b6c05 | 292 | #define PL080S_LLI_CCTL2 4 |
ba6785ff TF |
293 | |
294 | /* Total words in an LLI. */ | |
295 | #define PL080_LLI_WORDS 4 | |
da1b6c05 | 296 | #define PL080S_LLI_WORDS 8 |
e8689e63 | 297 | |
ba6785ff TF |
298 | /* |
299 | * Number of LLIs in each LLI buffer allocated for one transfer | |
300 | * (maximum times we call dma_pool_alloc on this pool without freeing) | |
301 | */ | |
302 | #define MAX_NUM_TSFR_LLIS 512 | |
e8689e63 LW |
303 | #define PL08X_ALIGN 8 |
304 | ||
305 | static inline struct pl08x_dma_chan *to_pl08x_chan(struct dma_chan *chan) | |
306 | { | |
01d8dc64 | 307 | return container_of(chan, struct pl08x_dma_chan, vc.chan); |
e8689e63 LW |
308 | } |
309 | ||
501e67e8 RKAL |
310 | static inline struct pl08x_txd *to_pl08x_txd(struct dma_async_tx_descriptor *tx) |
311 | { | |
01d8dc64 | 312 | return container_of(tx, struct pl08x_txd, vd.tx); |
501e67e8 RKAL |
313 | } |
314 | ||
6b16c8b1 RK |
315 | /* |
316 | * Mux handling. | |
317 | * | |
318 | * This gives us the DMA request input to the PL08x primecell which the | |
319 | * peripheral described by the channel data will be routed to, possibly | |
320 | * via a board/SoC specific external MUX. One important point to note | |
321 | * here is that this does not depend on the physical channel. | |
322 | */ | |
ad0de2ac | 323 | static int pl08x_request_mux(struct pl08x_dma_chan *plchan) |
6b16c8b1 RK |
324 | { |
325 | const struct pl08x_platform_data *pd = plchan->host->pd; | |
326 | int ret; | |
327 | ||
d7cabeed MB |
328 | if (plchan->mux_use++ == 0 && pd->get_xfer_signal) { |
329 | ret = pd->get_xfer_signal(plchan->cd); | |
5e2479bd RK |
330 | if (ret < 0) { |
331 | plchan->mux_use = 0; | |
6b16c8b1 | 332 | return ret; |
5e2479bd | 333 | } |
6b16c8b1 | 334 | |
ad0de2ac | 335 | plchan->signal = ret; |
6b16c8b1 RK |
336 | } |
337 | return 0; | |
338 | } | |
339 | ||
340 | static void pl08x_release_mux(struct pl08x_dma_chan *plchan) | |
341 | { | |
342 | const struct pl08x_platform_data *pd = plchan->host->pd; | |
343 | ||
5e2479bd RK |
344 | if (plchan->signal >= 0) { |
345 | WARN_ON(plchan->mux_use == 0); | |
346 | ||
d7cabeed MB |
347 | if (--plchan->mux_use == 0 && pd->put_xfer_signal) { |
348 | pd->put_xfer_signal(plchan->cd, plchan->signal); | |
5e2479bd RK |
349 | plchan->signal = -1; |
350 | } | |
6b16c8b1 RK |
351 | } |
352 | } | |
353 | ||
e8689e63 LW |
354 | /* |
355 | * Physical channel handling | |
356 | */ | |
357 | ||
358 | /* Whether a certain channel is busy or not */ | |
359 | static int pl08x_phy_channel_busy(struct pl08x_phy_chan *ch) | |
360 | { | |
361 | unsigned int val; | |
362 | ||
d86ccea7 | 363 | val = readl(ch->reg_config); |
e8689e63 LW |
364 | return val & PL080_CONFIG_ACTIVE; |
365 | } | |
366 | ||
ba6785ff TF |
367 | static void pl08x_write_lli(struct pl08x_driver_data *pl08x, |
368 | struct pl08x_phy_chan *phychan, const u32 *lli, u32 ccfg) | |
369 | { | |
da1b6c05 TF |
370 | if (pl08x->vd->pl080s) |
371 | dev_vdbg(&pl08x->adev->dev, | |
372 | "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, " | |
373 | "clli=0x%08x, cctl=0x%08x, cctl2=0x%08x, ccfg=0x%08x\n", | |
374 | phychan->id, lli[PL080_LLI_SRC], lli[PL080_LLI_DST], | |
375 | lli[PL080_LLI_LLI], lli[PL080_LLI_CCTL], | |
376 | lli[PL080S_LLI_CCTL2], ccfg); | |
377 | else | |
378 | dev_vdbg(&pl08x->adev->dev, | |
379 | "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, " | |
380 | "clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n", | |
381 | phychan->id, lli[PL080_LLI_SRC], lli[PL080_LLI_DST], | |
382 | lli[PL080_LLI_LLI], lli[PL080_LLI_CCTL], ccfg); | |
ba6785ff TF |
383 | |
384 | writel_relaxed(lli[PL080_LLI_SRC], phychan->base + PL080_CH_SRC_ADDR); | |
385 | writel_relaxed(lli[PL080_LLI_DST], phychan->base + PL080_CH_DST_ADDR); | |
386 | writel_relaxed(lli[PL080_LLI_LLI], phychan->base + PL080_CH_LLI); | |
387 | writel_relaxed(lli[PL080_LLI_CCTL], phychan->base + PL080_CH_CONTROL); | |
388 | ||
da1b6c05 TF |
389 | if (pl08x->vd->pl080s) |
390 | writel_relaxed(lli[PL080S_LLI_CCTL2], | |
391 | phychan->base + PL080S_CH_CONTROL2); | |
392 | ||
ba6785ff TF |
393 | writel(ccfg, phychan->reg_config); |
394 | } | |
395 | ||
e8689e63 LW |
396 | /* |
397 | * Set the initial DMA register values i.e. those for the first LLI | |
e8b5e11d | 398 | * The next LLI pointer and the configuration interrupt bit have |
c885bee4 RKAL |
399 | * been set when the LLIs were constructed. Poke them into the hardware |
400 | * and start the transfer. | |
e8689e63 | 401 | */ |
eab82533 | 402 | static void pl08x_start_next_txd(struct pl08x_dma_chan *plchan) |
e8689e63 | 403 | { |
c885bee4 | 404 | struct pl08x_driver_data *pl08x = plchan->host; |
e8689e63 | 405 | struct pl08x_phy_chan *phychan = plchan->phychan; |
879f127b RK |
406 | struct virt_dma_desc *vd = vchan_next_desc(&plchan->vc); |
407 | struct pl08x_txd *txd = to_pl08x_txd(&vd->tx); | |
09b3c323 | 408 | u32 val; |
c885bee4 | 409 | |
879f127b | 410 | list_del(&txd->vd.node); |
eab82533 | 411 | |
c885bee4 | 412 | plchan->at = txd; |
e8689e63 | 413 | |
c885bee4 RKAL |
414 | /* Wait for channel inactive */ |
415 | while (pl08x_phy_channel_busy(phychan)) | |
416 | cpu_relax(); | |
e8689e63 | 417 | |
ba6785ff | 418 | pl08x_write_lli(pl08x, phychan, &txd->llis_va[0], txd->ccfg); |
c885bee4 RKAL |
419 | |
420 | /* Enable the DMA channel */ | |
421 | /* Do not access config register until channel shows as disabled */ | |
ded091fe | 422 | while (readl(pl08x->base + PL080_EN_CHAN) & BIT(phychan->id)) |
19386b32 | 423 | cpu_relax(); |
e8689e63 | 424 | |
c885bee4 | 425 | /* Do not access config register until channel shows as inactive */ |
d86ccea7 | 426 | val = readl(phychan->reg_config); |
e8689e63 | 427 | while ((val & PL080_CONFIG_ACTIVE) || (val & PL080_CONFIG_ENABLE)) |
d86ccea7 | 428 | val = readl(phychan->reg_config); |
e8689e63 | 429 | |
d86ccea7 | 430 | writel(val | PL080_CONFIG_ENABLE, phychan->reg_config); |
e8689e63 LW |
431 | } |
432 | ||
433 | /* | |
81796616 | 434 | * Pause the channel by setting the HALT bit. |
e8689e63 | 435 | * |
81796616 RKAL |
436 | * For M->P transfers, pause the DMAC first and then stop the peripheral - |
437 | * the FIFO can only drain if the peripheral is still requesting data. | |
438 | * (note: this can still timeout if the DMAC FIFO never drains of data.) | |
e8689e63 | 439 | * |
81796616 RKAL |
440 | * For P->M transfers, disable the peripheral first to stop it filling |
441 | * the DMAC FIFO, and then pause the DMAC. | |
e8689e63 LW |
442 | */ |
443 | static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch) | |
444 | { | |
445 | u32 val; | |
81796616 | 446 | int timeout; |
e8689e63 LW |
447 | |
448 | /* Set the HALT bit and wait for the FIFO to drain */ | |
d86ccea7 | 449 | val = readl(ch->reg_config); |
e8689e63 | 450 | val |= PL080_CONFIG_HALT; |
d86ccea7 | 451 | writel(val, ch->reg_config); |
e8689e63 LW |
452 | |
453 | /* Wait for channel inactive */ | |
81796616 RKAL |
454 | for (timeout = 1000; timeout; timeout--) { |
455 | if (!pl08x_phy_channel_busy(ch)) | |
456 | break; | |
457 | udelay(1); | |
458 | } | |
459 | if (pl08x_phy_channel_busy(ch)) | |
460 | pr_err("pl08x: channel%u timeout waiting for pause\n", ch->id); | |
e8689e63 LW |
461 | } |
462 | ||
463 | static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch) | |
464 | { | |
465 | u32 val; | |
466 | ||
467 | /* Clear the HALT bit */ | |
d86ccea7 | 468 | val = readl(ch->reg_config); |
e8689e63 | 469 | val &= ~PL080_CONFIG_HALT; |
d86ccea7 | 470 | writel(val, ch->reg_config); |
e8689e63 LW |
471 | } |
472 | ||
fb526210 RKAL |
473 | /* |
474 | * pl08x_terminate_phy_chan() stops the channel, clears the FIFO and | |
475 | * clears any pending interrupt status. This should not be used for | |
476 | * an on-going transfer, but as a method of shutting down a channel | |
477 | * (eg, when it's no longer used) or terminating a transfer. | |
478 | */ | |
479 | static void pl08x_terminate_phy_chan(struct pl08x_driver_data *pl08x, | |
480 | struct pl08x_phy_chan *ch) | |
e8689e63 | 481 | { |
d86ccea7 | 482 | u32 val = readl(ch->reg_config); |
e8689e63 | 483 | |
fb526210 | 484 | val &= ~(PL080_CONFIG_ENABLE | PL080_CONFIG_ERR_IRQ_MASK | |
5835aa86 | 485 | PL080_CONFIG_TC_IRQ_MASK); |
e8689e63 | 486 | |
d86ccea7 | 487 | writel(val, ch->reg_config); |
fb526210 | 488 | |
ded091fe LW |
489 | writel(BIT(ch->id), pl08x->base + PL080_ERR_CLEAR); |
490 | writel(BIT(ch->id), pl08x->base + PL080_TC_CLEAR); | |
e8689e63 LW |
491 | } |
492 | ||
493 | static inline u32 get_bytes_in_cctl(u32 cctl) | |
494 | { | |
495 | /* The source width defines the number of bytes */ | |
496 | u32 bytes = cctl & PL080_CONTROL_TRANSFER_SIZE_MASK; | |
497 | ||
f3287a52 AB |
498 | cctl &= PL080_CONTROL_SWIDTH_MASK; |
499 | ||
e8689e63 LW |
500 | switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) { |
501 | case PL080_WIDTH_8BIT: | |
502 | break; | |
503 | case PL080_WIDTH_16BIT: | |
504 | bytes *= 2; | |
505 | break; | |
506 | case PL080_WIDTH_32BIT: | |
507 | bytes *= 4; | |
508 | break; | |
509 | } | |
510 | return bytes; | |
511 | } | |
512 | ||
da1b6c05 TF |
513 | static inline u32 get_bytes_in_cctl_pl080s(u32 cctl, u32 cctl1) |
514 | { | |
515 | /* The source width defines the number of bytes */ | |
516 | u32 bytes = cctl1 & PL080S_CONTROL_TRANSFER_SIZE_MASK; | |
517 | ||
f3287a52 AB |
518 | cctl &= PL080_CONTROL_SWIDTH_MASK; |
519 | ||
e8689e63 LW |
520 | switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) { |
521 | case PL080_WIDTH_8BIT: | |
522 | break; | |
523 | case PL080_WIDTH_16BIT: | |
524 | bytes *= 2; | |
525 | break; | |
526 | case PL080_WIDTH_32BIT: | |
527 | bytes *= 4; | |
528 | break; | |
529 | } | |
530 | return bytes; | |
531 | } | |
532 | ||
533 | /* The channel should be paused when calling this */ | |
534 | static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan) | |
535 | { | |
ba6785ff TF |
536 | struct pl08x_driver_data *pl08x = plchan->host; |
537 | const u32 *llis_va, *llis_va_limit; | |
e8689e63 | 538 | struct pl08x_phy_chan *ch; |
68a7faa2 | 539 | dma_addr_t llis_bus; |
e8689e63 | 540 | struct pl08x_txd *txd; |
ba6785ff | 541 | u32 llis_max_words; |
68a7faa2 | 542 | size_t bytes; |
68a7faa2 | 543 | u32 clli; |
e8689e63 | 544 | |
e8689e63 LW |
545 | ch = plchan->phychan; |
546 | txd = plchan->at; | |
547 | ||
68a7faa2 TF |
548 | if (!ch || !txd) |
549 | return 0; | |
550 | ||
e8689e63 | 551 | /* |
db9f136a RKAL |
552 | * Follow the LLIs to get the number of remaining |
553 | * bytes in the currently active transaction. | |
e8689e63 | 554 | */ |
68a7faa2 | 555 | clli = readl(ch->base + PL080_CH_LLI) & ~PL080_LLI_LM_AHB2; |
e8689e63 | 556 | |
68a7faa2 | 557 | /* First get the remaining bytes in the active transfer */ |
da1b6c05 TF |
558 | if (pl08x->vd->pl080s) |
559 | bytes = get_bytes_in_cctl_pl080s( | |
560 | readl(ch->base + PL080_CH_CONTROL), | |
561 | readl(ch->base + PL080S_CH_CONTROL2)); | |
562 | else | |
e8689e63 LW |
563 | bytes = get_bytes_in_cctl(readl(ch->base + PL080_CH_CONTROL)); |
564 | ||
68a7faa2 TF |
565 | if (!clli) |
566 | return bytes; | |
db9f136a | 567 | |
68a7faa2 TF |
568 | llis_va = txd->llis_va; |
569 | llis_bus = txd->llis_bus; | |
e8689e63 | 570 | |
ba6785ff | 571 | llis_max_words = pl08x->lli_words * MAX_NUM_TSFR_LLIS; |
68a7faa2 | 572 | BUG_ON(clli < llis_bus || clli >= llis_bus + |
ba6785ff | 573 | sizeof(u32) * llis_max_words); |
db9f136a | 574 | |
68a7faa2 TF |
575 | /* |
576 | * Locate the next LLI - as this is an array, | |
577 | * it's simple maths to find. | |
578 | */ | |
ba6785ff | 579 | llis_va += (clli - llis_bus) / sizeof(u32); |
e8689e63 | 580 | |
ba6785ff TF |
581 | llis_va_limit = llis_va + llis_max_words; |
582 | ||
583 | for (; llis_va < llis_va_limit; llis_va += pl08x->lli_words) { | |
da1b6c05 TF |
584 | if (pl08x->vd->pl080s) |
585 | bytes += get_bytes_in_cctl_pl080s( | |
586 | llis_va[PL080_LLI_CCTL], | |
587 | llis_va[PL080S_LLI_CCTL2]); | |
588 | else | |
589 | bytes += get_bytes_in_cctl(llis_va[PL080_LLI_CCTL]); | |
68a7faa2 TF |
590 | |
591 | /* | |
3b24c20b | 592 | * A LLI pointer going backward terminates the LLI list |
68a7faa2 | 593 | */ |
3b24c20b | 594 | if (llis_va[PL080_LLI_LLI] <= clli) |
68a7faa2 | 595 | break; |
e8689e63 LW |
596 | } |
597 | ||
e8689e63 LW |
598 | return bytes; |
599 | } | |
600 | ||
601 | /* | |
602 | * Allocate a physical channel for a virtual channel | |
94ae8522 RKAL |
603 | * |
604 | * Try to locate a physical channel to be used for this transfer. If all | |
605 | * are taken return NULL and the requester will have to cope by using | |
606 | * some fallback PIO mode or retrying later. | |
e8689e63 LW |
607 | */ |
608 | static struct pl08x_phy_chan * | |
609 | pl08x_get_phy_channel(struct pl08x_driver_data *pl08x, | |
610 | struct pl08x_dma_chan *virt_chan) | |
611 | { | |
612 | struct pl08x_phy_chan *ch = NULL; | |
613 | unsigned long flags; | |
614 | int i; | |
615 | ||
e8689e63 LW |
616 | for (i = 0; i < pl08x->vd->channels; i++) { |
617 | ch = &pl08x->phy_chans[i]; | |
618 | ||
619 | spin_lock_irqsave(&ch->lock, flags); | |
620 | ||
affa115e | 621 | if (!ch->locked && !ch->serving) { |
e8689e63 | 622 | ch->serving = virt_chan; |
e8689e63 LW |
623 | spin_unlock_irqrestore(&ch->lock, flags); |
624 | break; | |
625 | } | |
626 | ||
627 | spin_unlock_irqrestore(&ch->lock, flags); | |
628 | } | |
629 | ||
630 | if (i == pl08x->vd->channels) { | |
631 | /* No physical channel available, cope with it */ | |
632 | return NULL; | |
633 | } | |
634 | ||
635 | return ch; | |
636 | } | |
637 | ||
a5a488db | 638 | /* Mark the physical channel as free. Note, this write is atomic. */ |
e8689e63 LW |
639 | static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x, |
640 | struct pl08x_phy_chan *ch) | |
641 | { | |
a5a488db RK |
642 | ch->serving = NULL; |
643 | } | |
e8689e63 | 644 | |
a5a488db RK |
645 | /* |
646 | * Try to allocate a physical channel. When successful, assign it to | |
647 | * this virtual channel, and initiate the next descriptor. The | |
648 | * virtual channel lock must be held at this point. | |
649 | */ | |
650 | static void pl08x_phy_alloc_and_start(struct pl08x_dma_chan *plchan) | |
651 | { | |
652 | struct pl08x_driver_data *pl08x = plchan->host; | |
653 | struct pl08x_phy_chan *ch; | |
fb526210 | 654 | |
a5a488db RK |
655 | ch = pl08x_get_phy_channel(pl08x, plchan); |
656 | if (!ch) { | |
657 | dev_dbg(&pl08x->adev->dev, "no physical channel available for xfer on %s\n", plchan->name); | |
658 | plchan->state = PL08X_CHAN_WAITING; | |
659 | return; | |
660 | } | |
e8689e63 | 661 | |
a5a488db RK |
662 | dev_dbg(&pl08x->adev->dev, "allocated physical channel %d for xfer on %s\n", |
663 | ch->id, plchan->name); | |
664 | ||
665 | plchan->phychan = ch; | |
666 | plchan->state = PL08X_CHAN_RUNNING; | |
667 | pl08x_start_next_txd(plchan); | |
668 | } | |
669 | ||
670 | static void pl08x_phy_reassign_start(struct pl08x_phy_chan *ch, | |
671 | struct pl08x_dma_chan *plchan) | |
672 | { | |
673 | struct pl08x_driver_data *pl08x = plchan->host; | |
674 | ||
675 | dev_dbg(&pl08x->adev->dev, "reassigned physical channel %d for xfer on %s\n", | |
676 | ch->id, plchan->name); | |
677 | ||
678 | /* | |
679 | * We do this without taking the lock; we're really only concerned | |
680 | * about whether this pointer is NULL or not, and we're guaranteed | |
681 | * that this will only be called when it _already_ is non-NULL. | |
682 | */ | |
683 | ch->serving = plchan; | |
684 | plchan->phychan = ch; | |
685 | plchan->state = PL08X_CHAN_RUNNING; | |
686 | pl08x_start_next_txd(plchan); | |
687 | } | |
688 | ||
689 | /* | |
690 | * Free a physical DMA channel, potentially reallocating it to another | |
691 | * virtual channel if we have any pending. | |
692 | */ | |
693 | static void pl08x_phy_free(struct pl08x_dma_chan *plchan) | |
694 | { | |
695 | struct pl08x_driver_data *pl08x = plchan->host; | |
696 | struct pl08x_dma_chan *p, *next; | |
697 | ||
698 | retry: | |
699 | next = NULL; | |
700 | ||
701 | /* Find a waiting virtual channel for the next transfer. */ | |
01d8dc64 | 702 | list_for_each_entry(p, &pl08x->memcpy.channels, vc.chan.device_node) |
a5a488db RK |
703 | if (p->state == PL08X_CHAN_WAITING) { |
704 | next = p; | |
705 | break; | |
706 | } | |
707 | ||
708 | if (!next) { | |
01d8dc64 | 709 | list_for_each_entry(p, &pl08x->slave.channels, vc.chan.device_node) |
a5a488db RK |
710 | if (p->state == PL08X_CHAN_WAITING) { |
711 | next = p; | |
712 | break; | |
713 | } | |
714 | } | |
715 | ||
716 | /* Ensure that the physical channel is stopped */ | |
717 | pl08x_terminate_phy_chan(pl08x, plchan->phychan); | |
718 | ||
719 | if (next) { | |
720 | bool success; | |
721 | ||
722 | /* | |
723 | * Eww. We know this isn't going to deadlock | |
724 | * but lockdep probably doesn't. | |
725 | */ | |
083be28a | 726 | spin_lock(&next->vc.lock); |
a5a488db RK |
727 | /* Re-check the state now that we have the lock */ |
728 | success = next->state == PL08X_CHAN_WAITING; | |
729 | if (success) | |
730 | pl08x_phy_reassign_start(plchan->phychan, next); | |
083be28a | 731 | spin_unlock(&next->vc.lock); |
a5a488db RK |
732 | |
733 | /* If the state changed, try to find another channel */ | |
734 | if (!success) | |
735 | goto retry; | |
736 | } else { | |
737 | /* No more jobs, so free up the physical channel */ | |
738 | pl08x_put_phy_channel(pl08x, plchan->phychan); | |
739 | } | |
740 | ||
741 | plchan->phychan = NULL; | |
742 | plchan->state = PL08X_CHAN_IDLE; | |
e8689e63 LW |
743 | } |
744 | ||
745 | /* | |
746 | * LLI handling | |
747 | */ | |
748 | ||
749 | static inline unsigned int pl08x_get_bytes_for_cctl(unsigned int coded) | |
750 | { | |
751 | switch (coded) { | |
752 | case PL080_WIDTH_8BIT: | |
753 | return 1; | |
754 | case PL080_WIDTH_16BIT: | |
755 | return 2; | |
756 | case PL080_WIDTH_32BIT: | |
757 | return 4; | |
758 | default: | |
759 | break; | |
760 | } | |
761 | BUG(); | |
762 | return 0; | |
763 | } | |
764 | ||
765 | static inline u32 pl08x_cctl_bits(u32 cctl, u8 srcwidth, u8 dstwidth, | |
cace6585 | 766 | size_t tsize) |
e8689e63 LW |
767 | { |
768 | u32 retbits = cctl; | |
769 | ||
e8b5e11d | 770 | /* Remove all src, dst and transfer size bits */ |
e8689e63 LW |
771 | retbits &= ~PL080_CONTROL_DWIDTH_MASK; |
772 | retbits &= ~PL080_CONTROL_SWIDTH_MASK; | |
773 | retbits &= ~PL080_CONTROL_TRANSFER_SIZE_MASK; | |
774 | ||
775 | /* Then set the bits according to the parameters */ | |
776 | switch (srcwidth) { | |
777 | case 1: | |
778 | retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
779 | break; | |
780 | case 2: | |
781 | retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
782 | break; | |
783 | case 4: | |
784 | retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
785 | break; | |
786 | default: | |
787 | BUG(); | |
788 | break; | |
789 | } | |
790 | ||
791 | switch (dstwidth) { | |
792 | case 1: | |
793 | retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
794 | break; | |
795 | case 2: | |
796 | retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
797 | break; | |
798 | case 4: | |
799 | retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
800 | break; | |
801 | default: | |
802 | BUG(); | |
803 | break; | |
804 | } | |
805 | ||
5110e51d | 806 | tsize &= PL080_CONTROL_TRANSFER_SIZE_MASK; |
e8689e63 LW |
807 | retbits |= tsize << PL080_CONTROL_TRANSFER_SIZE_SHIFT; |
808 | return retbits; | |
809 | } | |
810 | ||
542361f8 RKAL |
811 | struct pl08x_lli_build_data { |
812 | struct pl08x_txd *txd; | |
542361f8 RKAL |
813 | struct pl08x_bus_data srcbus; |
814 | struct pl08x_bus_data dstbus; | |
815 | size_t remainder; | |
25c94f7f | 816 | u32 lli_bus; |
542361f8 RKAL |
817 | }; |
818 | ||
e8689e63 | 819 | /* |
0532e6fc VK |
820 | * Autoselect a master bus to use for the transfer. Slave will be the chosen as |
821 | * victim in case src & dest are not similarly aligned. i.e. If after aligning | |
822 | * masters address with width requirements of transfer (by sending few byte by | |
823 | * byte data), slave is still not aligned, then its width will be reduced to | |
824 | * BYTE. | |
825 | * - prefers the destination bus if both available | |
036f05fd | 826 | * - prefers bus with fixed address (i.e. peripheral) |
e8689e63 | 827 | */ |
542361f8 RKAL |
828 | static void pl08x_choose_master_bus(struct pl08x_lli_build_data *bd, |
829 | struct pl08x_bus_data **mbus, struct pl08x_bus_data **sbus, u32 cctl) | |
e8689e63 LW |
830 | { |
831 | if (!(cctl & PL080_CONTROL_DST_INCR)) { | |
542361f8 RKAL |
832 | *mbus = &bd->dstbus; |
833 | *sbus = &bd->srcbus; | |
036f05fd VK |
834 | } else if (!(cctl & PL080_CONTROL_SRC_INCR)) { |
835 | *mbus = &bd->srcbus; | |
836 | *sbus = &bd->dstbus; | |
e8689e63 | 837 | } else { |
036f05fd | 838 | if (bd->dstbus.buswidth >= bd->srcbus.buswidth) { |
542361f8 RKAL |
839 | *mbus = &bd->dstbus; |
840 | *sbus = &bd->srcbus; | |
036f05fd | 841 | } else { |
542361f8 RKAL |
842 | *mbus = &bd->srcbus; |
843 | *sbus = &bd->dstbus; | |
e8689e63 LW |
844 | } |
845 | } | |
846 | } | |
847 | ||
848 | /* | |
94ae8522 | 849 | * Fills in one LLI for a certain transfer descriptor and advance the counter |
e8689e63 | 850 | */ |
ba6785ff TF |
851 | static void pl08x_fill_lli_for_desc(struct pl08x_driver_data *pl08x, |
852 | struct pl08x_lli_build_data *bd, | |
da1b6c05 | 853 | int num_llis, int len, u32 cctl, u32 cctl2) |
e8689e63 | 854 | { |
ba6785ff TF |
855 | u32 offset = num_llis * pl08x->lli_words; |
856 | u32 *llis_va = bd->txd->llis_va + offset; | |
542361f8 | 857 | dma_addr_t llis_bus = bd->txd->llis_bus; |
e8689e63 LW |
858 | |
859 | BUG_ON(num_llis >= MAX_NUM_TSFR_LLIS); | |
860 | ||
ba6785ff TF |
861 | /* Advance the offset to next LLI. */ |
862 | offset += pl08x->lli_words; | |
863 | ||
864 | llis_va[PL080_LLI_SRC] = bd->srcbus.addr; | |
865 | llis_va[PL080_LLI_DST] = bd->dstbus.addr; | |
866 | llis_va[PL080_LLI_LLI] = (llis_bus + sizeof(u32) * offset); | |
867 | llis_va[PL080_LLI_LLI] |= bd->lli_bus; | |
868 | llis_va[PL080_LLI_CCTL] = cctl; | |
da1b6c05 TF |
869 | if (pl08x->vd->pl080s) |
870 | llis_va[PL080S_LLI_CCTL2] = cctl2; | |
e8689e63 LW |
871 | |
872 | if (cctl & PL080_CONTROL_SRC_INCR) | |
542361f8 | 873 | bd->srcbus.addr += len; |
e8689e63 | 874 | if (cctl & PL080_CONTROL_DST_INCR) |
542361f8 | 875 | bd->dstbus.addr += len; |
e8689e63 | 876 | |
542361f8 | 877 | BUG_ON(bd->remainder < len); |
cace6585 | 878 | |
542361f8 | 879 | bd->remainder -= len; |
e8689e63 LW |
880 | } |
881 | ||
ba6785ff TF |
882 | static inline void prep_byte_width_lli(struct pl08x_driver_data *pl08x, |
883 | struct pl08x_lli_build_data *bd, u32 *cctl, u32 len, | |
884 | int num_llis, size_t *total_bytes) | |
e8689e63 | 885 | { |
03af500f | 886 | *cctl = pl08x_cctl_bits(*cctl, 1, 1, len); |
da1b6c05 | 887 | pl08x_fill_lli_for_desc(pl08x, bd, num_llis, len, *cctl, len); |
03af500f | 888 | (*total_bytes) += len; |
e8689e63 LW |
889 | } |
890 | ||
48924e42 TF |
891 | #ifdef VERBOSE_DEBUG |
892 | static void pl08x_dump_lli(struct pl08x_driver_data *pl08x, | |
893 | const u32 *llis_va, int num_llis) | |
894 | { | |
895 | int i; | |
896 | ||
da1b6c05 | 897 | if (pl08x->vd->pl080s) { |
48924e42 | 898 | dev_vdbg(&pl08x->adev->dev, |
da1b6c05 TF |
899 | "%-3s %-9s %-10s %-10s %-10s %-10s %s\n", |
900 | "lli", "", "csrc", "cdst", "clli", "cctl", "cctl2"); | |
901 | for (i = 0; i < num_llis; i++) { | |
902 | dev_vdbg(&pl08x->adev->dev, | |
903 | "%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n", | |
904 | i, llis_va, llis_va[PL080_LLI_SRC], | |
905 | llis_va[PL080_LLI_DST], llis_va[PL080_LLI_LLI], | |
906 | llis_va[PL080_LLI_CCTL], | |
907 | llis_va[PL080S_LLI_CCTL2]); | |
908 | llis_va += pl08x->lli_words; | |
909 | } | |
910 | } else { | |
911 | dev_vdbg(&pl08x->adev->dev, | |
912 | "%-3s %-9s %-10s %-10s %-10s %s\n", | |
913 | "lli", "", "csrc", "cdst", "clli", "cctl"); | |
914 | for (i = 0; i < num_llis; i++) { | |
915 | dev_vdbg(&pl08x->adev->dev, | |
916 | "%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x\n", | |
917 | i, llis_va, llis_va[PL080_LLI_SRC], | |
918 | llis_va[PL080_LLI_DST], llis_va[PL080_LLI_LLI], | |
919 | llis_va[PL080_LLI_CCTL]); | |
920 | llis_va += pl08x->lli_words; | |
921 | } | |
48924e42 TF |
922 | } |
923 | } | |
924 | #else | |
925 | static inline void pl08x_dump_lli(struct pl08x_driver_data *pl08x, | |
926 | const u32 *llis_va, int num_llis) {} | |
927 | #endif | |
928 | ||
e8689e63 LW |
929 | /* |
930 | * This fills in the table of LLIs for the transfer descriptor | |
931 | * Note that we assume we never have to change the burst sizes | |
932 | * Return 0 for error | |
933 | */ | |
934 | static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, | |
935 | struct pl08x_txd *txd) | |
936 | { | |
e8689e63 | 937 | struct pl08x_bus_data *mbus, *sbus; |
542361f8 | 938 | struct pl08x_lli_build_data bd; |
e8689e63 | 939 | int num_llis = 0; |
03af500f | 940 | u32 cctl, early_bytes = 0; |
b7f69d9d | 941 | size_t max_bytes_per_lli, total_bytes; |
ba6785ff | 942 | u32 *llis_va, *last_lli; |
b7f69d9d | 943 | struct pl08x_sg *dsg; |
e8689e63 | 944 | |
3e27ee84 | 945 | txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT, &txd->llis_bus); |
e8689e63 LW |
946 | if (!txd->llis_va) { |
947 | dev_err(&pl08x->adev->dev, "%s no memory for llis\n", __func__); | |
948 | return 0; | |
949 | } | |
950 | ||
542361f8 | 951 | bd.txd = txd; |
25c94f7f | 952 | bd.lli_bus = (pl08x->lli_buses & PL08X_AHB2) ? PL080_LLI_LM_AHB2 : 0; |
b7f69d9d | 953 | cctl = txd->cctl; |
542361f8 | 954 | |
e8689e63 | 955 | /* Find maximum width of the source bus */ |
542361f8 | 956 | bd.srcbus.maxwidth = |
e8689e63 LW |
957 | pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_SWIDTH_MASK) >> |
958 | PL080_CONTROL_SWIDTH_SHIFT); | |
959 | ||
960 | /* Find maximum width of the destination bus */ | |
542361f8 | 961 | bd.dstbus.maxwidth = |
e8689e63 LW |
962 | pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_DWIDTH_MASK) >> |
963 | PL080_CONTROL_DWIDTH_SHIFT); | |
964 | ||
b7f69d9d VK |
965 | list_for_each_entry(dsg, &txd->dsg_list, node) { |
966 | total_bytes = 0; | |
967 | cctl = txd->cctl; | |
e8689e63 | 968 | |
b7f69d9d VK |
969 | bd.srcbus.addr = dsg->src_addr; |
970 | bd.dstbus.addr = dsg->dst_addr; | |
971 | bd.remainder = dsg->len; | |
972 | bd.srcbus.buswidth = bd.srcbus.maxwidth; | |
973 | bd.dstbus.buswidth = bd.dstbus.maxwidth; | |
e8689e63 | 974 | |
b7f69d9d | 975 | pl08x_choose_master_bus(&bd, &mbus, &sbus, cctl); |
e8689e63 | 976 | |
b90ca063 AP |
977 | dev_vdbg(&pl08x->adev->dev, |
978 | "src=0x%08llx%s/%u dst=0x%08llx%s/%u len=%zu\n", | |
979 | (u64)bd.srcbus.addr, | |
980 | cctl & PL080_CONTROL_SRC_INCR ? "+" : "", | |
b7f69d9d | 981 | bd.srcbus.buswidth, |
b90ca063 AP |
982 | (u64)bd.dstbus.addr, |
983 | cctl & PL080_CONTROL_DST_INCR ? "+" : "", | |
b7f69d9d VK |
984 | bd.dstbus.buswidth, |
985 | bd.remainder); | |
986 | dev_vdbg(&pl08x->adev->dev, "mbus=%s sbus=%s\n", | |
987 | mbus == &bd.srcbus ? "src" : "dst", | |
988 | sbus == &bd.srcbus ? "src" : "dst"); | |
fc74eb79 | 989 | |
b7f69d9d VK |
990 | /* |
991 | * Zero length is only allowed if all these requirements are | |
992 | * met: | |
993 | * - flow controller is peripheral. | |
994 | * - src.addr is aligned to src.width | |
995 | * - dst.addr is aligned to dst.width | |
996 | * | |
997 | * sg_len == 1 should be true, as there can be two cases here: | |
998 | * | |
999 | * - Memory addresses are contiguous and are not scattered. | |
1000 | * Here, Only one sg will be passed by user driver, with | |
1001 | * memory address and zero length. We pass this to controller | |
1002 | * and after the transfer it will receive the last burst | |
1003 | * request from peripheral and so transfer finishes. | |
1004 | * | |
1005 | * - Memory addresses are scattered and are not contiguous. | |
1006 | * Here, Obviously as DMA controller doesn't know when a lli's | |
1007 | * transfer gets over, it can't load next lli. So in this | |
1008 | * case, there has to be an assumption that only one lli is | |
1009 | * supported. Thus, we can't have scattered addresses. | |
1010 | */ | |
1011 | if (!bd.remainder) { | |
1012 | u32 fc = (txd->ccfg & PL080_CONFIG_FLOW_CONTROL_MASK) >> | |
1013 | PL080_CONFIG_FLOW_CONTROL_SHIFT; | |
1014 | if (!((fc >= PL080_FLOW_SRC2DST_DST) && | |
0a235657 | 1015 | (fc <= PL080_FLOW_SRC2DST_SRC))) { |
b7f69d9d VK |
1016 | dev_err(&pl08x->adev->dev, "%s sg len can't be zero", |
1017 | __func__); | |
1018 | return 0; | |
1019 | } | |
0a235657 | 1020 | |
1c38b289 AP |
1021 | if (!IS_BUS_ALIGNED(&bd.srcbus) || |
1022 | !IS_BUS_ALIGNED(&bd.dstbus)) { | |
b7f69d9d VK |
1023 | dev_err(&pl08x->adev->dev, |
1024 | "%s src & dst address must be aligned to src" | |
1025 | " & dst width if peripheral is flow controller", | |
1026 | __func__); | |
1027 | return 0; | |
1028 | } | |
03af500f | 1029 | |
b7f69d9d VK |
1030 | cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth, |
1031 | bd.dstbus.buswidth, 0); | |
ba6785ff | 1032 | pl08x_fill_lli_for_desc(pl08x, &bd, num_llis++, |
da1b6c05 | 1033 | 0, cctl, 0); |
b7f69d9d VK |
1034 | break; |
1035 | } | |
e8689e63 LW |
1036 | |
1037 | /* | |
b7f69d9d VK |
1038 | * Send byte by byte for following cases |
1039 | * - Less than a bus width available | |
1040 | * - until master bus is aligned | |
e8689e63 | 1041 | */ |
b7f69d9d VK |
1042 | if (bd.remainder < mbus->buswidth) |
1043 | early_bytes = bd.remainder; | |
1c38b289 AP |
1044 | else if (!IS_BUS_ALIGNED(mbus)) { |
1045 | early_bytes = mbus->buswidth - | |
1046 | (mbus->addr & (mbus->buswidth - 1)); | |
b7f69d9d VK |
1047 | if ((bd.remainder - early_bytes) < mbus->buswidth) |
1048 | early_bytes = bd.remainder; | |
1049 | } | |
e8689e63 | 1050 | |
b7f69d9d VK |
1051 | if (early_bytes) { |
1052 | dev_vdbg(&pl08x->adev->dev, | |
6fc8ae78 | 1053 | "%s byte width LLIs (remain 0x%08zx)\n", |
b7f69d9d | 1054 | __func__, bd.remainder); |
ba6785ff TF |
1055 | prep_byte_width_lli(pl08x, &bd, &cctl, early_bytes, |
1056 | num_llis++, &total_bytes); | |
e8689e63 LW |
1057 | } |
1058 | ||
b7f69d9d VK |
1059 | if (bd.remainder) { |
1060 | /* | |
1061 | * Master now aligned | |
1062 | * - if slave is not then we must set its width down | |
1063 | */ | |
1c38b289 | 1064 | if (!IS_BUS_ALIGNED(sbus)) { |
b7f69d9d VK |
1065 | dev_dbg(&pl08x->adev->dev, |
1066 | "%s set down bus width to one byte\n", | |
1067 | __func__); | |
fa6a940b | 1068 | |
b7f69d9d VK |
1069 | sbus->buswidth = 1; |
1070 | } | |
e8689e63 LW |
1071 | |
1072 | /* | |
b7f69d9d VK |
1073 | * Bytes transferred = tsize * src width, not |
1074 | * MIN(buswidths) | |
e8689e63 | 1075 | */ |
b7f69d9d | 1076 | max_bytes_per_lli = bd.srcbus.buswidth * |
5110e51d | 1077 | pl08x->vd->max_transfer_size; |
b7f69d9d VK |
1078 | dev_vdbg(&pl08x->adev->dev, |
1079 | "%s max bytes per lli = %zu\n", | |
1080 | __func__, max_bytes_per_lli); | |
e8689e63 LW |
1081 | |
1082 | /* | |
b7f69d9d VK |
1083 | * Make largest possible LLIs until less than one bus |
1084 | * width left | |
e8689e63 | 1085 | */ |
b7f69d9d VK |
1086 | while (bd.remainder > (mbus->buswidth - 1)) { |
1087 | size_t lli_len, tsize, width; | |
e8689e63 | 1088 | |
b7f69d9d VK |
1089 | /* |
1090 | * If enough left try to send max possible, | |
1091 | * otherwise try to send the remainder | |
1092 | */ | |
1093 | lli_len = min(bd.remainder, max_bytes_per_lli); | |
16a2e7d3 | 1094 | |
b7f69d9d VK |
1095 | /* |
1096 | * Check against maximum bus alignment: | |
1097 | * Calculate actual transfer size in relation to | |
1098 | * bus width an get a maximum remainder of the | |
1099 | * highest bus width - 1 | |
1100 | */ | |
1101 | width = max(mbus->buswidth, sbus->buswidth); | |
1102 | lli_len = (lli_len / width) * width; | |
1103 | tsize = lli_len / bd.srcbus.buswidth; | |
1104 | ||
1105 | dev_vdbg(&pl08x->adev->dev, | |
1106 | "%s fill lli with single lli chunk of " | |
1107 | "size 0x%08zx (remainder 0x%08zx)\n", | |
1108 | __func__, lli_len, bd.remainder); | |
1109 | ||
1110 | cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth, | |
16a2e7d3 | 1111 | bd.dstbus.buswidth, tsize); |
ba6785ff | 1112 | pl08x_fill_lli_for_desc(pl08x, &bd, num_llis++, |
da1b6c05 | 1113 | lli_len, cctl, tsize); |
b7f69d9d VK |
1114 | total_bytes += lli_len; |
1115 | } | |
e8689e63 | 1116 | |
b7f69d9d VK |
1117 | /* |
1118 | * Send any odd bytes | |
1119 | */ | |
1120 | if (bd.remainder) { | |
1121 | dev_vdbg(&pl08x->adev->dev, | |
1122 | "%s align with boundary, send odd bytes (remain %zu)\n", | |
1123 | __func__, bd.remainder); | |
ba6785ff TF |
1124 | prep_byte_width_lli(pl08x, &bd, &cctl, |
1125 | bd.remainder, num_llis++, &total_bytes); | |
b7f69d9d | 1126 | } |
e8689e63 | 1127 | } |
16a2e7d3 | 1128 | |
b7f69d9d VK |
1129 | if (total_bytes != dsg->len) { |
1130 | dev_err(&pl08x->adev->dev, | |
1131 | "%s size of encoded lli:s don't match total txd, transferred 0x%08zx from size 0x%08zx\n", | |
1132 | __func__, total_bytes, dsg->len); | |
1133 | return 0; | |
1134 | } | |
e8689e63 | 1135 | |
b7f69d9d VK |
1136 | if (num_llis >= MAX_NUM_TSFR_LLIS) { |
1137 | dev_err(&pl08x->adev->dev, | |
1138 | "%s need to increase MAX_NUM_TSFR_LLIS from 0x%08x\n", | |
ba6785ff | 1139 | __func__, MAX_NUM_TSFR_LLIS); |
b7f69d9d VK |
1140 | return 0; |
1141 | } | |
e8689e63 | 1142 | } |
b58b6b5b RKAL |
1143 | |
1144 | llis_va = txd->llis_va; | |
ba6785ff | 1145 | last_lli = llis_va + (num_llis - 1) * pl08x->lli_words; |
e8689e63 | 1146 | |
3b24c20b AB |
1147 | if (txd->cyclic) { |
1148 | /* Link back to the first LLI. */ | |
1149 | last_lli[PL080_LLI_LLI] = txd->llis_bus | bd.lli_bus; | |
1150 | } else { | |
1151 | /* The final LLI terminates the LLI. */ | |
1152 | last_lli[PL080_LLI_LLI] = 0; | |
1153 | /* The final LLI element shall also fire an interrupt. */ | |
1154 | last_lli[PL080_LLI_CCTL] |= PL080_CONTROL_TC_IRQ_EN; | |
e8689e63 | 1155 | } |
e8689e63 | 1156 | |
48924e42 | 1157 | pl08x_dump_lli(pl08x, llis_va, num_llis); |
e8689e63 LW |
1158 | |
1159 | return num_llis; | |
1160 | } | |
1161 | ||
e8689e63 LW |
1162 | static void pl08x_free_txd(struct pl08x_driver_data *pl08x, |
1163 | struct pl08x_txd *txd) | |
1164 | { | |
b7f69d9d VK |
1165 | struct pl08x_sg *dsg, *_dsg; |
1166 | ||
c1205646 VK |
1167 | if (txd->llis_va) |
1168 | dma_pool_free(pl08x->pool, txd->llis_va, txd->llis_bus); | |
e8689e63 | 1169 | |
b7f69d9d VK |
1170 | list_for_each_entry_safe(dsg, _dsg, &txd->dsg_list, node) { |
1171 | list_del(&dsg->node); | |
1172 | kfree(dsg); | |
1173 | } | |
1174 | ||
e8689e63 LW |
1175 | kfree(txd); |
1176 | } | |
1177 | ||
18536134 RK |
1178 | static void pl08x_desc_free(struct virt_dma_desc *vd) |
1179 | { | |
1180 | struct pl08x_txd *txd = to_pl08x_txd(&vd->tx); | |
1181 | struct pl08x_dma_chan *plchan = to_pl08x_chan(vd->tx.chan); | |
18536134 | 1182 | |
89116bf9 | 1183 | dma_descriptor_unmap(&vd->tx); |
18536134 RK |
1184 | if (!txd->done) |
1185 | pl08x_release_mux(plchan); | |
1186 | ||
18536134 | 1187 | pl08x_free_txd(plchan->host, txd); |
18536134 RK |
1188 | } |
1189 | ||
e8689e63 LW |
1190 | static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x, |
1191 | struct pl08x_dma_chan *plchan) | |
1192 | { | |
ea160561 | 1193 | LIST_HEAD(head); |
e8689e63 | 1194 | |
879f127b | 1195 | vchan_get_all_descriptors(&plchan->vc, &head); |
91998261 | 1196 | vchan_dma_desc_free_list(&plchan->vc, &head); |
e8689e63 LW |
1197 | } |
1198 | ||
1199 | /* | |
1200 | * The DMA ENGINE API | |
1201 | */ | |
e8689e63 LW |
1202 | static void pl08x_free_chan_resources(struct dma_chan *chan) |
1203 | { | |
a068682c RK |
1204 | /* Ensure all queued descriptors are freed */ |
1205 | vchan_free_chan_resources(to_virt_chan(chan)); | |
e8689e63 LW |
1206 | } |
1207 | ||
e8689e63 LW |
1208 | static struct dma_async_tx_descriptor *pl08x_prep_dma_interrupt( |
1209 | struct dma_chan *chan, unsigned long flags) | |
1210 | { | |
1211 | struct dma_async_tx_descriptor *retval = NULL; | |
1212 | ||
1213 | return retval; | |
1214 | } | |
1215 | ||
1216 | /* | |
94ae8522 RKAL |
1217 | * Code accessing dma_async_is_complete() in a tight loop may give problems. |
1218 | * If slaves are relying on interrupts to signal completion this function | |
1219 | * must not be called with interrupts disabled. | |
e8689e63 | 1220 | */ |
3e27ee84 VK |
1221 | static enum dma_status pl08x_dma_tx_status(struct dma_chan *chan, |
1222 | dma_cookie_t cookie, struct dma_tx_state *txstate) | |
e8689e63 LW |
1223 | { |
1224 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
06e885b7 RK |
1225 | struct virt_dma_desc *vd; |
1226 | unsigned long flags; | |
e8689e63 | 1227 | enum dma_status ret; |
06e885b7 | 1228 | size_t bytes = 0; |
e8689e63 | 1229 | |
96a2af41 | 1230 | ret = dma_cookie_status(chan, cookie, txstate); |
0996e895 | 1231 | if (ret == DMA_COMPLETE) |
e8689e63 | 1232 | return ret; |
e8689e63 | 1233 | |
06e885b7 RK |
1234 | /* |
1235 | * There's no point calculating the residue if there's | |
1236 | * no txstate to store the value. | |
1237 | */ | |
1238 | if (!txstate) { | |
1239 | if (plchan->state == PL08X_CHAN_PAUSED) | |
1240 | ret = DMA_PAUSED; | |
1241 | return ret; | |
1242 | } | |
1243 | ||
1244 | spin_lock_irqsave(&plchan->vc.lock, flags); | |
1245 | ret = dma_cookie_status(chan, cookie, txstate); | |
0996e895 | 1246 | if (ret != DMA_COMPLETE) { |
06e885b7 RK |
1247 | vd = vchan_find_desc(&plchan->vc, cookie); |
1248 | if (vd) { | |
1249 | /* On the issued list, so hasn't been processed yet */ | |
1250 | struct pl08x_txd *txd = to_pl08x_txd(&vd->tx); | |
1251 | struct pl08x_sg *dsg; | |
1252 | ||
1253 | list_for_each_entry(dsg, &txd->dsg_list, node) | |
1254 | bytes += dsg->len; | |
1255 | } else { | |
1256 | bytes = pl08x_getbytes_chan(plchan); | |
1257 | } | |
1258 | } | |
1259 | spin_unlock_irqrestore(&plchan->vc.lock, flags); | |
1260 | ||
e8689e63 LW |
1261 | /* |
1262 | * This cookie not complete yet | |
96a2af41 | 1263 | * Get number of bytes left in the active transactions and queue |
e8689e63 | 1264 | */ |
06e885b7 | 1265 | dma_set_residue(txstate, bytes); |
e8689e63 | 1266 | |
06e885b7 RK |
1267 | if (plchan->state == PL08X_CHAN_PAUSED && ret == DMA_IN_PROGRESS) |
1268 | ret = DMA_PAUSED; | |
e8689e63 LW |
1269 | |
1270 | /* Whether waiting or running, we're in progress */ | |
06e885b7 | 1271 | return ret; |
e8689e63 LW |
1272 | } |
1273 | ||
1274 | /* PrimeCell DMA extension */ | |
1275 | struct burst_table { | |
760596c6 | 1276 | u32 burstwords; |
e8689e63 LW |
1277 | u32 reg; |
1278 | }; | |
1279 | ||
1280 | static const struct burst_table burst_sizes[] = { | |
1281 | { | |
1282 | .burstwords = 256, | |
760596c6 | 1283 | .reg = PL080_BSIZE_256, |
e8689e63 LW |
1284 | }, |
1285 | { | |
1286 | .burstwords = 128, | |
760596c6 | 1287 | .reg = PL080_BSIZE_128, |
e8689e63 LW |
1288 | }, |
1289 | { | |
1290 | .burstwords = 64, | |
760596c6 | 1291 | .reg = PL080_BSIZE_64, |
e8689e63 LW |
1292 | }, |
1293 | { | |
1294 | .burstwords = 32, | |
760596c6 | 1295 | .reg = PL080_BSIZE_32, |
e8689e63 LW |
1296 | }, |
1297 | { | |
1298 | .burstwords = 16, | |
760596c6 | 1299 | .reg = PL080_BSIZE_16, |
e8689e63 LW |
1300 | }, |
1301 | { | |
1302 | .burstwords = 8, | |
760596c6 | 1303 | .reg = PL080_BSIZE_8, |
e8689e63 LW |
1304 | }, |
1305 | { | |
1306 | .burstwords = 4, | |
760596c6 | 1307 | .reg = PL080_BSIZE_4, |
e8689e63 LW |
1308 | }, |
1309 | { | |
760596c6 RKAL |
1310 | .burstwords = 0, |
1311 | .reg = PL080_BSIZE_1, | |
e8689e63 LW |
1312 | }, |
1313 | }; | |
1314 | ||
121c8476 RKAL |
1315 | /* |
1316 | * Given the source and destination available bus masks, select which | |
1317 | * will be routed to each port. We try to have source and destination | |
1318 | * on separate ports, but always respect the allowable settings. | |
1319 | */ | |
1320 | static u32 pl08x_select_bus(u8 src, u8 dst) | |
1321 | { | |
1322 | u32 cctl = 0; | |
1323 | ||
1324 | if (!(dst & PL08X_AHB1) || ((dst & PL08X_AHB2) && (src & PL08X_AHB1))) | |
1325 | cctl |= PL080_CONTROL_DST_AHB2; | |
1326 | if (!(src & PL08X_AHB1) || ((src & PL08X_AHB2) && !(dst & PL08X_AHB2))) | |
1327 | cctl |= PL080_CONTROL_SRC_AHB2; | |
1328 | ||
1329 | return cctl; | |
1330 | } | |
1331 | ||
f14c426c RKAL |
1332 | static u32 pl08x_cctl(u32 cctl) |
1333 | { | |
1334 | cctl &= ~(PL080_CONTROL_SRC_AHB2 | PL080_CONTROL_DST_AHB2 | | |
1335 | PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR | | |
1336 | PL080_CONTROL_PROT_MASK); | |
1337 | ||
1338 | /* Access the cell in privileged mode, non-bufferable, non-cacheable */ | |
1339 | return cctl | PL080_CONTROL_PROT_SYS; | |
1340 | } | |
1341 | ||
aa88cdaa RKAL |
1342 | static u32 pl08x_width(enum dma_slave_buswidth width) |
1343 | { | |
1344 | switch (width) { | |
1345 | case DMA_SLAVE_BUSWIDTH_1_BYTE: | |
1346 | return PL080_WIDTH_8BIT; | |
1347 | case DMA_SLAVE_BUSWIDTH_2_BYTES: | |
1348 | return PL080_WIDTH_16BIT; | |
1349 | case DMA_SLAVE_BUSWIDTH_4_BYTES: | |
1350 | return PL080_WIDTH_32BIT; | |
f32807f1 VK |
1351 | default: |
1352 | return ~0; | |
aa88cdaa | 1353 | } |
aa88cdaa RKAL |
1354 | } |
1355 | ||
760596c6 RKAL |
1356 | static u32 pl08x_burst(u32 maxburst) |
1357 | { | |
1358 | int i; | |
1359 | ||
1360 | for (i = 0; i < ARRAY_SIZE(burst_sizes); i++) | |
1361 | if (burst_sizes[i].burstwords <= maxburst) | |
1362 | break; | |
1363 | ||
1364 | return burst_sizes[i].reg; | |
1365 | } | |
1366 | ||
9862ba17 RK |
1367 | static u32 pl08x_get_cctl(struct pl08x_dma_chan *plchan, |
1368 | enum dma_slave_buswidth addr_width, u32 maxburst) | |
1369 | { | |
1370 | u32 width, burst, cctl = 0; | |
1371 | ||
1372 | width = pl08x_width(addr_width); | |
1373 | if (width == ~0) | |
1374 | return ~0; | |
1375 | ||
1376 | cctl |= width << PL080_CONTROL_SWIDTH_SHIFT; | |
1377 | cctl |= width << PL080_CONTROL_DWIDTH_SHIFT; | |
1378 | ||
1379 | /* | |
1380 | * If this channel will only request single transfers, set this | |
1381 | * down to ONE element. Also select one element if no maxburst | |
1382 | * is specified. | |
1383 | */ | |
1384 | if (plchan->cd->single) | |
1385 | maxburst = 1; | |
1386 | ||
1387 | burst = pl08x_burst(maxburst); | |
1388 | cctl |= burst << PL080_CONTROL_SB_SIZE_SHIFT; | |
1389 | cctl |= burst << PL080_CONTROL_DB_SIZE_SHIFT; | |
1390 | ||
1391 | return pl08x_cctl(cctl); | |
1392 | } | |
1393 | ||
e8689e63 LW |
1394 | /* |
1395 | * Slave transactions callback to the slave device to allow | |
1396 | * synchronization of slave DMA signals with the DMAC enable | |
1397 | */ | |
1398 | static void pl08x_issue_pending(struct dma_chan *chan) | |
1399 | { | |
1400 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
e8689e63 LW |
1401 | unsigned long flags; |
1402 | ||
083be28a | 1403 | spin_lock_irqsave(&plchan->vc.lock, flags); |
879f127b | 1404 | if (vchan_issue_pending(&plchan->vc)) { |
a5a488db RK |
1405 | if (!plchan->phychan && plchan->state != PL08X_CHAN_WAITING) |
1406 | pl08x_phy_alloc_and_start(plchan); | |
e8689e63 | 1407 | } |
083be28a | 1408 | spin_unlock_irqrestore(&plchan->vc.lock, flags); |
e8689e63 LW |
1409 | } |
1410 | ||
879f127b | 1411 | static struct pl08x_txd *pl08x_get_txd(struct pl08x_dma_chan *plchan) |
ac3cd20d | 1412 | { |
b201c111 | 1413 | struct pl08x_txd *txd = kzalloc(sizeof(*txd), GFP_NOWAIT); |
ac3cd20d RKAL |
1414 | |
1415 | if (txd) { | |
b7f69d9d | 1416 | INIT_LIST_HEAD(&txd->dsg_list); |
4983a04f RKAL |
1417 | |
1418 | /* Always enable error and terminal interrupts */ | |
1419 | txd->ccfg = PL080_CONFIG_ERR_IRQ_MASK | | |
1420 | PL080_CONFIG_TC_IRQ_MASK; | |
ac3cd20d RKAL |
1421 | } |
1422 | return txd; | |
1423 | } | |
1424 | ||
e8689e63 LW |
1425 | /* |
1426 | * Initialize a descriptor to be used by memcpy submit | |
1427 | */ | |
1428 | static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy( | |
1429 | struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, | |
1430 | size_t len, unsigned long flags) | |
1431 | { | |
1432 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1433 | struct pl08x_driver_data *pl08x = plchan->host; | |
1434 | struct pl08x_txd *txd; | |
b7f69d9d | 1435 | struct pl08x_sg *dsg; |
4166a56a | 1436 | u32 cctl = 0; |
e8689e63 LW |
1437 | int ret; |
1438 | ||
879f127b | 1439 | txd = pl08x_get_txd(plchan); |
e8689e63 LW |
1440 | if (!txd) { |
1441 | dev_err(&pl08x->adev->dev, | |
1442 | "%s no memory for descriptor\n", __func__); | |
1443 | return NULL; | |
1444 | } | |
1445 | ||
b7f69d9d VK |
1446 | dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT); |
1447 | if (!dsg) { | |
1448 | pl08x_free_txd(pl08x, txd); | |
b7f69d9d VK |
1449 | return NULL; |
1450 | } | |
1451 | list_add_tail(&dsg->node, &txd->dsg_list); | |
1452 | ||
b7f69d9d VK |
1453 | dsg->src_addr = src; |
1454 | dsg->dst_addr = dest; | |
1455 | dsg->len = len; | |
e8689e63 LW |
1456 | |
1457 | /* Set platform data for m2m */ | |
4983a04f | 1458 | txd->ccfg |= PL080_FLOW_MEM2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT; |
4166a56a LW |
1459 | |
1460 | /* Conjure cctl */ | |
1461 | switch (pl08x->pd->memcpy_burst_size) { | |
1462 | default: | |
1463 | dev_err(&pl08x->adev->dev, | |
1464 | "illegal burst size for memcpy, set to 1\n"); | |
1465 | /* Fall through */ | |
1466 | case PL08X_BURST_SZ_1: | |
1467 | cctl |= PL080_BSIZE_1 << PL080_CONTROL_SB_SIZE_SHIFT | | |
1468 | PL080_BSIZE_1 << PL080_CONTROL_DB_SIZE_SHIFT; | |
1469 | break; | |
1470 | case PL08X_BURST_SZ_4: | |
1471 | cctl |= PL080_BSIZE_4 << PL080_CONTROL_SB_SIZE_SHIFT | | |
1472 | PL080_BSIZE_4 << PL080_CONTROL_DB_SIZE_SHIFT; | |
1473 | break; | |
1474 | case PL08X_BURST_SZ_8: | |
1475 | cctl |= PL080_BSIZE_8 << PL080_CONTROL_SB_SIZE_SHIFT | | |
1476 | PL080_BSIZE_8 << PL080_CONTROL_DB_SIZE_SHIFT; | |
1477 | break; | |
1478 | case PL08X_BURST_SZ_16: | |
1479 | cctl |= PL080_BSIZE_16 << PL080_CONTROL_SB_SIZE_SHIFT | | |
1480 | PL080_BSIZE_16 << PL080_CONTROL_DB_SIZE_SHIFT; | |
1481 | break; | |
1482 | case PL08X_BURST_SZ_32: | |
1483 | cctl |= PL080_BSIZE_32 << PL080_CONTROL_SB_SIZE_SHIFT | | |
1484 | PL080_BSIZE_32 << PL080_CONTROL_DB_SIZE_SHIFT; | |
1485 | break; | |
1486 | case PL08X_BURST_SZ_64: | |
1487 | cctl |= PL080_BSIZE_64 << PL080_CONTROL_SB_SIZE_SHIFT | | |
1488 | PL080_BSIZE_64 << PL080_CONTROL_DB_SIZE_SHIFT; | |
1489 | break; | |
1490 | case PL08X_BURST_SZ_128: | |
1491 | cctl |= PL080_BSIZE_128 << PL080_CONTROL_SB_SIZE_SHIFT | | |
1492 | PL080_BSIZE_128 << PL080_CONTROL_DB_SIZE_SHIFT; | |
1493 | break; | |
1494 | case PL08X_BURST_SZ_256: | |
1495 | cctl |= PL080_BSIZE_256 << PL080_CONTROL_SB_SIZE_SHIFT | | |
1496 | PL080_BSIZE_256 << PL080_CONTROL_DB_SIZE_SHIFT; | |
1497 | break; | |
1498 | } | |
1499 | ||
1500 | switch (pl08x->pd->memcpy_bus_width) { | |
1501 | default: | |
1502 | dev_err(&pl08x->adev->dev, | |
1503 | "illegal bus width for memcpy, set to 8 bits\n"); | |
1504 | /* Fall through */ | |
1505 | case PL08X_BUS_WIDTH_8_BITS: | |
1506 | cctl |= PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT | | |
1507 | PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
1508 | break; | |
1509 | case PL08X_BUS_WIDTH_16_BITS: | |
1510 | cctl |= PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT | | |
1511 | PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
1512 | break; | |
1513 | case PL08X_BUS_WIDTH_32_BITS: | |
1514 | cctl |= PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT | | |
1515 | PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
1516 | break; | |
1517 | } | |
1518 | ||
1519 | /* Protection flags */ | |
1520 | if (pl08x->pd->memcpy_prot_buff) | |
1521 | cctl |= PL080_CONTROL_PROT_BUFF; | |
1522 | if (pl08x->pd->memcpy_prot_cache) | |
1523 | cctl |= PL080_CONTROL_PROT_CACHE; | |
1524 | ||
1525 | /* We are the kernel, so we are in privileged mode */ | |
1526 | cctl |= PL080_CONTROL_PROT_SYS; | |
4983a04f | 1527 | |
e8689e63 | 1528 | /* Both to be incremented or the code will break */ |
4166a56a | 1529 | cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR; |
c7da9a56 | 1530 | |
c7da9a56 | 1531 | if (pl08x->vd->dualmaster) |
4166a56a LW |
1532 | cctl |= pl08x_select_bus(pl08x->mem_buses, |
1533 | pl08x->mem_buses); | |
1534 | ||
1535 | txd->cctl = cctl; | |
e8689e63 | 1536 | |
aa4afb75 RK |
1537 | ret = pl08x_fill_llis_for_desc(plchan->host, txd); |
1538 | if (!ret) { | |
1539 | pl08x_free_txd(pl08x, txd); | |
e8689e63 | 1540 | return NULL; |
aa4afb75 | 1541 | } |
e8689e63 | 1542 | |
879f127b | 1543 | return vchan_tx_prep(&plchan->vc, &txd->vd, flags); |
e8689e63 LW |
1544 | } |
1545 | ||
3b24c20b AB |
1546 | static struct pl08x_txd *pl08x_init_txd( |
1547 | struct dma_chan *chan, | |
1548 | enum dma_transfer_direction direction, | |
1549 | dma_addr_t *slave_addr) | |
e8689e63 LW |
1550 | { |
1551 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1552 | struct pl08x_driver_data *pl08x = plchan->host; | |
1553 | struct pl08x_txd *txd; | |
dc8d5f8d | 1554 | enum dma_slave_buswidth addr_width; |
0a235657 | 1555 | int ret, tmp; |
409ec8db | 1556 | u8 src_buses, dst_buses; |
dc8d5f8d | 1557 | u32 maxburst, cctl; |
e8689e63 | 1558 | |
879f127b | 1559 | txd = pl08x_get_txd(plchan); |
e8689e63 LW |
1560 | if (!txd) { |
1561 | dev_err(&pl08x->adev->dev, "%s no txd\n", __func__); | |
1562 | return NULL; | |
1563 | } | |
1564 | ||
e8689e63 LW |
1565 | /* |
1566 | * Set up addresses, the PrimeCell configured address | |
1567 | * will take precedence since this may configure the | |
1568 | * channel target address dynamically at runtime. | |
1569 | */ | |
db8196df | 1570 | if (direction == DMA_MEM_TO_DEV) { |
dc8d5f8d | 1571 | cctl = PL080_CONTROL_SRC_INCR; |
3b24c20b | 1572 | *slave_addr = plchan->cfg.dst_addr; |
dc8d5f8d RK |
1573 | addr_width = plchan->cfg.dst_addr_width; |
1574 | maxburst = plchan->cfg.dst_maxburst; | |
409ec8db RK |
1575 | src_buses = pl08x->mem_buses; |
1576 | dst_buses = plchan->cd->periph_buses; | |
db8196df | 1577 | } else if (direction == DMA_DEV_TO_MEM) { |
dc8d5f8d | 1578 | cctl = PL080_CONTROL_DST_INCR; |
3b24c20b | 1579 | *slave_addr = plchan->cfg.src_addr; |
dc8d5f8d RK |
1580 | addr_width = plchan->cfg.src_addr_width; |
1581 | maxburst = plchan->cfg.src_maxburst; | |
409ec8db RK |
1582 | src_buses = plchan->cd->periph_buses; |
1583 | dst_buses = pl08x->mem_buses; | |
e8689e63 | 1584 | } else { |
b7f69d9d | 1585 | pl08x_free_txd(pl08x, txd); |
e8689e63 LW |
1586 | dev_err(&pl08x->adev->dev, |
1587 | "%s direction unsupported\n", __func__); | |
1588 | return NULL; | |
1589 | } | |
e8689e63 | 1590 | |
dc8d5f8d | 1591 | cctl |= pl08x_get_cctl(plchan, addr_width, maxburst); |
800d683e RK |
1592 | if (cctl == ~0) { |
1593 | pl08x_free_txd(pl08x, txd); | |
1594 | dev_err(&pl08x->adev->dev, | |
1595 | "DMA slave configuration botched?\n"); | |
1596 | return NULL; | |
1597 | } | |
1598 | ||
409ec8db RK |
1599 | txd->cctl = cctl | pl08x_select_bus(src_buses, dst_buses); |
1600 | ||
95442b22 | 1601 | if (plchan->cfg.device_fc) |
db8196df | 1602 | tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER_PER : |
0a235657 VK |
1603 | PL080_FLOW_PER2MEM_PER; |
1604 | else | |
db8196df | 1605 | tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER : |
0a235657 VK |
1606 | PL080_FLOW_PER2MEM; |
1607 | ||
1608 | txd->ccfg |= tmp << PL080_CONFIG_FLOW_CONTROL_SHIFT; | |
1609 | ||
c48d4963 RK |
1610 | ret = pl08x_request_mux(plchan); |
1611 | if (ret < 0) { | |
1612 | pl08x_free_txd(pl08x, txd); | |
1613 | dev_dbg(&pl08x->adev->dev, | |
1614 | "unable to mux for transfer on %s due to platform restrictions\n", | |
1615 | plchan->name); | |
1616 | return NULL; | |
1617 | } | |
1618 | ||
1619 | dev_dbg(&pl08x->adev->dev, "allocated DMA request signal %d for xfer on %s\n", | |
1620 | plchan->signal, plchan->name); | |
1621 | ||
1622 | /* Assign the flow control signal to this channel */ | |
1623 | if (direction == DMA_MEM_TO_DEV) | |
1624 | txd->ccfg |= plchan->signal << PL080_CONFIG_DST_SEL_SHIFT; | |
1625 | else | |
1626 | txd->ccfg |= plchan->signal << PL080_CONFIG_SRC_SEL_SHIFT; | |
1627 | ||
3b24c20b AB |
1628 | return txd; |
1629 | } | |
1630 | ||
1631 | static int pl08x_tx_add_sg(struct pl08x_txd *txd, | |
1632 | enum dma_transfer_direction direction, | |
1633 | dma_addr_t slave_addr, | |
1634 | dma_addr_t buf_addr, | |
1635 | unsigned int len) | |
1636 | { | |
1637 | struct pl08x_sg *dsg; | |
1638 | ||
1639 | dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT); | |
1640 | if (!dsg) | |
1641 | return -ENOMEM; | |
1642 | ||
1643 | list_add_tail(&dsg->node, &txd->dsg_list); | |
1644 | ||
1645 | dsg->len = len; | |
1646 | if (direction == DMA_MEM_TO_DEV) { | |
1647 | dsg->src_addr = buf_addr; | |
1648 | dsg->dst_addr = slave_addr; | |
1649 | } else { | |
1650 | dsg->src_addr = slave_addr; | |
1651 | dsg->dst_addr = buf_addr; | |
1652 | } | |
1653 | ||
1654 | return 0; | |
1655 | } | |
1656 | ||
1657 | static struct dma_async_tx_descriptor *pl08x_prep_slave_sg( | |
1658 | struct dma_chan *chan, struct scatterlist *sgl, | |
1659 | unsigned int sg_len, enum dma_transfer_direction direction, | |
1660 | unsigned long flags, void *context) | |
1661 | { | |
1662 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1663 | struct pl08x_driver_data *pl08x = plchan->host; | |
1664 | struct pl08x_txd *txd; | |
1665 | struct scatterlist *sg; | |
1666 | int ret, tmp; | |
1667 | dma_addr_t slave_addr; | |
1668 | ||
1669 | dev_dbg(&pl08x->adev->dev, "%s prepare transaction of %d bytes from %s\n", | |
1670 | __func__, sg_dma_len(sgl), plchan->name); | |
1671 | ||
1672 | txd = pl08x_init_txd(chan, direction, &slave_addr); | |
1673 | if (!txd) | |
1674 | return NULL; | |
1675 | ||
b7f69d9d | 1676 | for_each_sg(sgl, sg, sg_len, tmp) { |
3b24c20b AB |
1677 | ret = pl08x_tx_add_sg(txd, direction, slave_addr, |
1678 | sg_dma_address(sg), | |
1679 | sg_dma_len(sg)); | |
1680 | if (ret) { | |
c48d4963 | 1681 | pl08x_release_mux(plchan); |
b7f69d9d VK |
1682 | pl08x_free_txd(pl08x, txd); |
1683 | dev_err(&pl08x->adev->dev, "%s no mem for pl080 sg\n", | |
1684 | __func__); | |
1685 | return NULL; | |
1686 | } | |
3b24c20b | 1687 | } |
b7f69d9d | 1688 | |
3b24c20b AB |
1689 | ret = pl08x_fill_llis_for_desc(plchan->host, txd); |
1690 | if (!ret) { | |
1691 | pl08x_release_mux(plchan); | |
1692 | pl08x_free_txd(pl08x, txd); | |
1693 | return NULL; | |
1694 | } | |
1695 | ||
1696 | return vchan_tx_prep(&plchan->vc, &txd->vd, flags); | |
1697 | } | |
1698 | ||
1699 | static struct dma_async_tx_descriptor *pl08x_prep_dma_cyclic( | |
1700 | struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, | |
1701 | size_t period_len, enum dma_transfer_direction direction, | |
31c1e5a1 | 1702 | unsigned long flags) |
3b24c20b AB |
1703 | { |
1704 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1705 | struct pl08x_driver_data *pl08x = plchan->host; | |
1706 | struct pl08x_txd *txd; | |
1707 | int ret, tmp; | |
1708 | dma_addr_t slave_addr; | |
1709 | ||
1710 | dev_dbg(&pl08x->adev->dev, | |
6fc8ae78 | 1711 | "%s prepare cyclic transaction of %zd/%zd bytes %s %s\n", |
3b24c20b AB |
1712 | __func__, period_len, buf_len, |
1713 | direction == DMA_MEM_TO_DEV ? "to" : "from", | |
1714 | plchan->name); | |
1715 | ||
1716 | txd = pl08x_init_txd(chan, direction, &slave_addr); | |
1717 | if (!txd) | |
1718 | return NULL; | |
1719 | ||
1720 | txd->cyclic = true; | |
1721 | txd->cctl |= PL080_CONTROL_TC_IRQ_EN; | |
1722 | for (tmp = 0; tmp < buf_len; tmp += period_len) { | |
1723 | ret = pl08x_tx_add_sg(txd, direction, slave_addr, | |
1724 | buf_addr + tmp, period_len); | |
1725 | if (ret) { | |
1726 | pl08x_release_mux(plchan); | |
1727 | pl08x_free_txd(pl08x, txd); | |
1728 | return NULL; | |
b7f69d9d VK |
1729 | } |
1730 | } | |
1731 | ||
aa4afb75 RK |
1732 | ret = pl08x_fill_llis_for_desc(plchan->host, txd); |
1733 | if (!ret) { | |
1734 | pl08x_release_mux(plchan); | |
1735 | pl08x_free_txd(pl08x, txd); | |
e8689e63 | 1736 | return NULL; |
aa4afb75 | 1737 | } |
e8689e63 | 1738 | |
879f127b | 1739 | return vchan_tx_prep(&plchan->vc, &txd->vd, flags); |
e8689e63 LW |
1740 | } |
1741 | ||
bcd1b0b9 MR |
1742 | static int pl08x_config(struct dma_chan *chan, |
1743 | struct dma_slave_config *config) | |
1744 | { | |
1745 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1746 | struct pl08x_driver_data *pl08x = plchan->host; | |
1747 | ||
1748 | if (!plchan->slave) | |
1749 | return -EINVAL; | |
1750 | ||
1751 | /* Reject definitely invalid configurations */ | |
1752 | if (config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES || | |
1753 | config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES) | |
1754 | return -EINVAL; | |
1755 | ||
1756 | if (config->device_fc && pl08x->vd->pl080s) { | |
1757 | dev_err(&pl08x->adev->dev, | |
1758 | "%s: PL080S does not support peripheral flow control\n", | |
1759 | __func__); | |
1760 | return -EINVAL; | |
1761 | } | |
1762 | ||
1763 | plchan->cfg = *config; | |
1764 | ||
1765 | return 0; | |
1766 | } | |
1767 | ||
1768 | static int pl08x_terminate_all(struct dma_chan *chan) | |
e8689e63 LW |
1769 | { |
1770 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1771 | struct pl08x_driver_data *pl08x = plchan->host; | |
1772 | unsigned long flags; | |
e8689e63 | 1773 | |
bcd1b0b9 MR |
1774 | spin_lock_irqsave(&plchan->vc.lock, flags); |
1775 | if (!plchan->phychan && !plchan->at) { | |
1776 | spin_unlock_irqrestore(&plchan->vc.lock, flags); | |
1777 | return 0; | |
e8689e63 LW |
1778 | } |
1779 | ||
bcd1b0b9 MR |
1780 | plchan->state = PL08X_CHAN_IDLE; |
1781 | ||
1782 | if (plchan->phychan) { | |
1783 | /* | |
1784 | * Mark physical channel as free and free any slave | |
1785 | * signal | |
1786 | */ | |
1787 | pl08x_phy_free(plchan); | |
1788 | } | |
1789 | /* Dequeue jobs and free LLIs */ | |
1790 | if (plchan->at) { | |
1791 | pl08x_desc_free(&plchan->at->vd); | |
1792 | plchan->at = NULL; | |
1793 | } | |
1794 | /* Dequeue jobs not yet fired as well */ | |
1795 | pl08x_free_txd_list(pl08x, plchan); | |
1796 | ||
1797 | spin_unlock_irqrestore(&plchan->vc.lock, flags); | |
1798 | ||
1799 | return 0; | |
1800 | } | |
1801 | ||
1802 | static int pl08x_pause(struct dma_chan *chan) | |
1803 | { | |
1804 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1805 | unsigned long flags; | |
1806 | ||
e8689e63 LW |
1807 | /* |
1808 | * Anything succeeds on channels with no physical allocation and | |
1809 | * no queued transfers. | |
1810 | */ | |
083be28a | 1811 | spin_lock_irqsave(&plchan->vc.lock, flags); |
e8689e63 | 1812 | if (!plchan->phychan && !plchan->at) { |
083be28a | 1813 | spin_unlock_irqrestore(&plchan->vc.lock, flags); |
e8689e63 LW |
1814 | return 0; |
1815 | } | |
1816 | ||
bcd1b0b9 MR |
1817 | pl08x_pause_phy_chan(plchan->phychan); |
1818 | plchan->state = PL08X_CHAN_PAUSED; | |
e8689e63 | 1819 | |
bcd1b0b9 MR |
1820 | spin_unlock_irqrestore(&plchan->vc.lock, flags); |
1821 | ||
1822 | return 0; | |
1823 | } | |
1824 | ||
1825 | static int pl08x_resume(struct dma_chan *chan) | |
1826 | { | |
1827 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1828 | unsigned long flags; | |
1829 | ||
1830 | /* | |
1831 | * Anything succeeds on channels with no physical allocation and | |
1832 | * no queued transfers. | |
1833 | */ | |
1834 | spin_lock_irqsave(&plchan->vc.lock, flags); | |
1835 | if (!plchan->phychan && !plchan->at) { | |
1836 | spin_unlock_irqrestore(&plchan->vc.lock, flags); | |
1837 | return 0; | |
e8689e63 LW |
1838 | } |
1839 | ||
bcd1b0b9 MR |
1840 | pl08x_resume_phy_chan(plchan->phychan); |
1841 | plchan->state = PL08X_CHAN_RUNNING; | |
1842 | ||
083be28a | 1843 | spin_unlock_irqrestore(&plchan->vc.lock, flags); |
e8689e63 | 1844 | |
bcd1b0b9 | 1845 | return 0; |
e8689e63 LW |
1846 | } |
1847 | ||
1848 | bool pl08x_filter_id(struct dma_chan *chan, void *chan_id) | |
1849 | { | |
7703eac9 | 1850 | struct pl08x_dma_chan *plchan; |
e8689e63 LW |
1851 | char *name = chan_id; |
1852 | ||
7703eac9 RKAL |
1853 | /* Reject channels for devices not bound to this driver */ |
1854 | if (chan->device->dev->driver != &pl08x_amba_driver.drv) | |
1855 | return false; | |
1856 | ||
1857 | plchan = to_pl08x_chan(chan); | |
1858 | ||
e8689e63 LW |
1859 | /* Check that the channel is not taken! */ |
1860 | if (!strcmp(plchan->name, name)) | |
1861 | return true; | |
1862 | ||
1863 | return false; | |
1864 | } | |
6d05c9fa | 1865 | EXPORT_SYMBOL_GPL(pl08x_filter_id); |
e8689e63 | 1866 | |
da6f8ca1 SN |
1867 | static bool pl08x_filter_fn(struct dma_chan *chan, void *chan_id) |
1868 | { | |
1869 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1870 | ||
1871 | return plchan->cd == chan_id; | |
1872 | } | |
1873 | ||
e8689e63 LW |
1874 | /* |
1875 | * Just check that the device is there and active | |
94ae8522 RKAL |
1876 | * TODO: turn this bit on/off depending on the number of physical channels |
1877 | * actually used, if it is zero... well shut it off. That will save some | |
1878 | * power. Cut the clock at the same time. | |
e8689e63 LW |
1879 | */ |
1880 | static void pl08x_ensure_on(struct pl08x_driver_data *pl08x) | |
1881 | { | |
affa115e LW |
1882 | /* The Nomadik variant does not have the config register */ |
1883 | if (pl08x->vd->nomadik) | |
1884 | return; | |
48a59ef3 | 1885 | writel(PL080_CONFIG_ENABLE, pl08x->base + PL080_CONFIG); |
e8689e63 LW |
1886 | } |
1887 | ||
e8689e63 LW |
1888 | static irqreturn_t pl08x_irq(int irq, void *dev) |
1889 | { | |
1890 | struct pl08x_driver_data *pl08x = dev; | |
28da2836 VK |
1891 | u32 mask = 0, err, tc, i; |
1892 | ||
1893 | /* check & clear - ERR & TC interrupts */ | |
1894 | err = readl(pl08x->base + PL080_ERR_STATUS); | |
1895 | if (err) { | |
1896 | dev_err(&pl08x->adev->dev, "%s error interrupt, register value 0x%08x\n", | |
1897 | __func__, err); | |
1898 | writel(err, pl08x->base + PL080_ERR_CLEAR); | |
e8689e63 | 1899 | } |
d29bf019 | 1900 | tc = readl(pl08x->base + PL080_TC_STATUS); |
28da2836 VK |
1901 | if (tc) |
1902 | writel(tc, pl08x->base + PL080_TC_CLEAR); | |
1903 | ||
1904 | if (!err && !tc) | |
1905 | return IRQ_NONE; | |
1906 | ||
e8689e63 | 1907 | for (i = 0; i < pl08x->vd->channels; i++) { |
ded091fe | 1908 | if ((BIT(i) & err) || (BIT(i) & tc)) { |
e8689e63 LW |
1909 | /* Locate physical channel */ |
1910 | struct pl08x_phy_chan *phychan = &pl08x->phy_chans[i]; | |
1911 | struct pl08x_dma_chan *plchan = phychan->serving; | |
a936e793 | 1912 | struct pl08x_txd *tx; |
e8689e63 | 1913 | |
28da2836 VK |
1914 | if (!plchan) { |
1915 | dev_err(&pl08x->adev->dev, | |
1916 | "%s Error TC interrupt on unused channel: 0x%08x\n", | |
1917 | __func__, i); | |
1918 | continue; | |
1919 | } | |
1920 | ||
083be28a | 1921 | spin_lock(&plchan->vc.lock); |
a936e793 | 1922 | tx = plchan->at; |
3b24c20b AB |
1923 | if (tx && tx->cyclic) { |
1924 | vchan_cyclic_callback(&tx->vd); | |
1925 | } else if (tx) { | |
a936e793 | 1926 | plchan->at = NULL; |
c48d4963 RK |
1927 | /* |
1928 | * This descriptor is done, release its mux | |
1929 | * reservation. | |
1930 | */ | |
1931 | pl08x_release_mux(plchan); | |
18536134 RK |
1932 | tx->done = true; |
1933 | vchan_cookie_complete(&tx->vd); | |
c33b644c | 1934 | |
a5a488db RK |
1935 | /* |
1936 | * And start the next descriptor (if any), | |
1937 | * otherwise free this channel. | |
1938 | */ | |
879f127b | 1939 | if (vchan_next_desc(&plchan->vc)) |
c33b644c | 1940 | pl08x_start_next_txd(plchan); |
a5a488db RK |
1941 | else |
1942 | pl08x_phy_free(plchan); | |
a936e793 | 1943 | } |
083be28a | 1944 | spin_unlock(&plchan->vc.lock); |
a936e793 | 1945 | |
ded091fe | 1946 | mask |= BIT(i); |
e8689e63 LW |
1947 | } |
1948 | } | |
e8689e63 LW |
1949 | |
1950 | return mask ? IRQ_HANDLED : IRQ_NONE; | |
1951 | } | |
1952 | ||
121c8476 RKAL |
1953 | static void pl08x_dma_slave_init(struct pl08x_dma_chan *chan) |
1954 | { | |
121c8476 RKAL |
1955 | chan->slave = true; |
1956 | chan->name = chan->cd->bus_id; | |
ed91c13d RK |
1957 | chan->cfg.src_addr = chan->cd->addr; |
1958 | chan->cfg.dst_addr = chan->cd->addr; | |
121c8476 RKAL |
1959 | } |
1960 | ||
e8689e63 LW |
1961 | /* |
1962 | * Initialise the DMAC memcpy/slave channels. | |
1963 | * Make a local wrapper to hold required data | |
1964 | */ | |
1965 | static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x, | |
3e27ee84 | 1966 | struct dma_device *dmadev, unsigned int channels, bool slave) |
e8689e63 LW |
1967 | { |
1968 | struct pl08x_dma_chan *chan; | |
1969 | int i; | |
1970 | ||
1971 | INIT_LIST_HEAD(&dmadev->channels); | |
94ae8522 | 1972 | |
e8689e63 LW |
1973 | /* |
1974 | * Register as many many memcpy as we have physical channels, | |
1975 | * we won't always be able to use all but the code will have | |
1976 | * to cope with that situation. | |
1977 | */ | |
1978 | for (i = 0; i < channels; i++) { | |
b201c111 | 1979 | chan = kzalloc(sizeof(*chan), GFP_KERNEL); |
aef94fea | 1980 | if (!chan) |
e8689e63 | 1981 | return -ENOMEM; |
e8689e63 LW |
1982 | |
1983 | chan->host = pl08x; | |
1984 | chan->state = PL08X_CHAN_IDLE; | |
ad0de2ac | 1985 | chan->signal = -1; |
e8689e63 LW |
1986 | |
1987 | if (slave) { | |
e8689e63 | 1988 | chan->cd = &pl08x->pd->slave_channels[i]; |
f9cd4761 LW |
1989 | /* |
1990 | * Some implementations have muxed signals, whereas some | |
1991 | * use a mux in front of the signals and need dynamic | |
1992 | * assignment of signals. | |
1993 | */ | |
1994 | chan->signal = i; | |
121c8476 | 1995 | pl08x_dma_slave_init(chan); |
e8689e63 | 1996 | } else { |
4166a56a LW |
1997 | chan->cd = kzalloc(sizeof(*chan->cd), GFP_KERNEL); |
1998 | if (!chan->cd) { | |
1999 | kfree(chan); | |
2000 | return -ENOMEM; | |
2001 | } | |
2002 | chan->cd->bus_id = "memcpy"; | |
2003 | chan->cd->periph_buses = pl08x->pd->mem_buses; | |
e8689e63 LW |
2004 | chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i); |
2005 | if (!chan->name) { | |
4166a56a | 2006 | kfree(chan->cd); |
e8689e63 LW |
2007 | kfree(chan); |
2008 | return -ENOMEM; | |
2009 | } | |
2010 | } | |
175a5e61 | 2011 | dev_dbg(&pl08x->adev->dev, |
e8689e63 LW |
2012 | "initialize virtual channel \"%s\"\n", |
2013 | chan->name); | |
2014 | ||
18536134 | 2015 | chan->vc.desc_free = pl08x_desc_free; |
083be28a | 2016 | vchan_init(&chan->vc, dmadev); |
e8689e63 LW |
2017 | } |
2018 | dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n", | |
2019 | i, slave ? "slave" : "memcpy"); | |
2020 | return i; | |
2021 | } | |
2022 | ||
2023 | static void pl08x_free_virtual_channels(struct dma_device *dmadev) | |
2024 | { | |
2025 | struct pl08x_dma_chan *chan = NULL; | |
2026 | struct pl08x_dma_chan *next; | |
2027 | ||
2028 | list_for_each_entry_safe(chan, | |
01d8dc64 RK |
2029 | next, &dmadev->channels, vc.chan.device_node) { |
2030 | list_del(&chan->vc.chan.device_node); | |
e8689e63 LW |
2031 | kfree(chan); |
2032 | } | |
2033 | } | |
2034 | ||
2035 | #ifdef CONFIG_DEBUG_FS | |
2036 | static const char *pl08x_state_str(enum pl08x_dma_chan_state state) | |
2037 | { | |
2038 | switch (state) { | |
2039 | case PL08X_CHAN_IDLE: | |
2040 | return "idle"; | |
2041 | case PL08X_CHAN_RUNNING: | |
2042 | return "running"; | |
2043 | case PL08X_CHAN_PAUSED: | |
2044 | return "paused"; | |
2045 | case PL08X_CHAN_WAITING: | |
2046 | return "waiting"; | |
2047 | default: | |
2048 | break; | |
2049 | } | |
2050 | return "UNKNOWN STATE"; | |
2051 | } | |
2052 | ||
2053 | static int pl08x_debugfs_show(struct seq_file *s, void *data) | |
2054 | { | |
2055 | struct pl08x_driver_data *pl08x = s->private; | |
2056 | struct pl08x_dma_chan *chan; | |
2057 | struct pl08x_phy_chan *ch; | |
2058 | unsigned long flags; | |
2059 | int i; | |
2060 | ||
2061 | seq_printf(s, "PL08x physical channels:\n"); | |
2062 | seq_printf(s, "CHANNEL:\tUSER:\n"); | |
2063 | seq_printf(s, "--------\t-----\n"); | |
2064 | for (i = 0; i < pl08x->vd->channels; i++) { | |
2065 | struct pl08x_dma_chan *virt_chan; | |
2066 | ||
2067 | ch = &pl08x->phy_chans[i]; | |
2068 | ||
2069 | spin_lock_irqsave(&ch->lock, flags); | |
2070 | virt_chan = ch->serving; | |
2071 | ||
affa115e LW |
2072 | seq_printf(s, "%d\t\t%s%s\n", |
2073 | ch->id, | |
2074 | virt_chan ? virt_chan->name : "(none)", | |
2075 | ch->locked ? " LOCKED" : ""); | |
e8689e63 LW |
2076 | |
2077 | spin_unlock_irqrestore(&ch->lock, flags); | |
2078 | } | |
2079 | ||
2080 | seq_printf(s, "\nPL08x virtual memcpy channels:\n"); | |
2081 | seq_printf(s, "CHANNEL:\tSTATE:\n"); | |
2082 | seq_printf(s, "--------\t------\n"); | |
01d8dc64 | 2083 | list_for_each_entry(chan, &pl08x->memcpy.channels, vc.chan.device_node) { |
3e2a037c | 2084 | seq_printf(s, "%s\t\t%s\n", chan->name, |
e8689e63 LW |
2085 | pl08x_state_str(chan->state)); |
2086 | } | |
2087 | ||
2088 | seq_printf(s, "\nPL08x virtual slave channels:\n"); | |
2089 | seq_printf(s, "CHANNEL:\tSTATE:\n"); | |
2090 | seq_printf(s, "--------\t------\n"); | |
01d8dc64 | 2091 | list_for_each_entry(chan, &pl08x->slave.channels, vc.chan.device_node) { |
3e2a037c | 2092 | seq_printf(s, "%s\t\t%s\n", chan->name, |
e8689e63 LW |
2093 | pl08x_state_str(chan->state)); |
2094 | } | |
2095 | ||
2096 | return 0; | |
2097 | } | |
2098 | ||
2099 | static int pl08x_debugfs_open(struct inode *inode, struct file *file) | |
2100 | { | |
2101 | return single_open(file, pl08x_debugfs_show, inode->i_private); | |
2102 | } | |
2103 | ||
2104 | static const struct file_operations pl08x_debugfs_operations = { | |
2105 | .open = pl08x_debugfs_open, | |
2106 | .read = seq_read, | |
2107 | .llseek = seq_lseek, | |
2108 | .release = single_release, | |
2109 | }; | |
2110 | ||
2111 | static void init_pl08x_debugfs(struct pl08x_driver_data *pl08x) | |
2112 | { | |
2113 | /* Expose a simple debugfs interface to view all clocks */ | |
3e27ee84 VK |
2114 | (void) debugfs_create_file(dev_name(&pl08x->adev->dev), |
2115 | S_IFREG | S_IRUGO, NULL, pl08x, | |
2116 | &pl08x_debugfs_operations); | |
e8689e63 LW |
2117 | } |
2118 | ||
2119 | #else | |
2120 | static inline void init_pl08x_debugfs(struct pl08x_driver_data *pl08x) | |
2121 | { | |
2122 | } | |
2123 | #endif | |
2124 | ||
aa4734da LW |
2125 | #ifdef CONFIG_OF |
2126 | static struct dma_chan *pl08x_find_chan_id(struct pl08x_driver_data *pl08x, | |
2127 | u32 id) | |
2128 | { | |
2129 | struct pl08x_dma_chan *chan; | |
2130 | ||
2131 | list_for_each_entry(chan, &pl08x->slave.channels, vc.chan.device_node) { | |
2132 | if (chan->signal == id) | |
2133 | return &chan->vc.chan; | |
2134 | } | |
2135 | ||
2136 | return NULL; | |
2137 | } | |
2138 | ||
2139 | static struct dma_chan *pl08x_of_xlate(struct of_phandle_args *dma_spec, | |
2140 | struct of_dma *ofdma) | |
2141 | { | |
2142 | struct pl08x_driver_data *pl08x = ofdma->of_dma_data; | |
aa4734da | 2143 | struct dma_chan *dma_chan; |
f9cd4761 | 2144 | struct pl08x_dma_chan *plchan; |
aa4734da LW |
2145 | |
2146 | if (!pl08x) | |
2147 | return NULL; | |
2148 | ||
f9cd4761 LW |
2149 | if (dma_spec->args_count != 2) { |
2150 | dev_err(&pl08x->adev->dev, | |
2151 | "DMA channel translation requires two cells\n"); | |
aa4734da | 2152 | return NULL; |
f9cd4761 | 2153 | } |
aa4734da LW |
2154 | |
2155 | dma_chan = pl08x_find_chan_id(pl08x, dma_spec->args[0]); | |
f9cd4761 LW |
2156 | if (!dma_chan) { |
2157 | dev_err(&pl08x->adev->dev, | |
2158 | "DMA slave channel not found\n"); | |
aa4734da | 2159 | return NULL; |
f9cd4761 | 2160 | } |
aa4734da | 2161 | |
f9cd4761 LW |
2162 | plchan = to_pl08x_chan(dma_chan); |
2163 | dev_dbg(&pl08x->adev->dev, | |
2164 | "translated channel for signal %d\n", | |
2165 | dma_spec->args[0]); | |
aa4734da | 2166 | |
f9cd4761 LW |
2167 | /* Augment channel data for applicable AHB buses */ |
2168 | plchan->cd->periph_buses = dma_spec->args[1]; | |
2169 | return dma_get_slave_channel(dma_chan); | |
aa4734da LW |
2170 | } |
2171 | ||
2172 | static int pl08x_of_probe(struct amba_device *adev, | |
2173 | struct pl08x_driver_data *pl08x, | |
2174 | struct device_node *np) | |
2175 | { | |
2176 | struct pl08x_platform_data *pd; | |
f9cd4761 | 2177 | struct pl08x_channel_data *chanp = NULL; |
aa4734da LW |
2178 | u32 val; |
2179 | int ret; | |
f9cd4761 | 2180 | int i; |
aa4734da LW |
2181 | |
2182 | pd = devm_kzalloc(&adev->dev, sizeof(*pd), GFP_KERNEL); | |
2183 | if (!pd) | |
2184 | return -ENOMEM; | |
2185 | ||
2186 | /* Eligible bus masters for fetching LLIs */ | |
2187 | if (of_property_read_bool(np, "lli-bus-interface-ahb1")) | |
2188 | pd->lli_buses |= PL08X_AHB1; | |
2189 | if (of_property_read_bool(np, "lli-bus-interface-ahb2")) | |
2190 | pd->lli_buses |= PL08X_AHB2; | |
2191 | if (!pd->lli_buses) { | |
2192 | dev_info(&adev->dev, "no bus masters for LLIs stated, assume all\n"); | |
2193 | pd->lli_buses |= PL08X_AHB1 | PL08X_AHB2; | |
2194 | } | |
2195 | ||
2196 | /* Eligible bus masters for memory access */ | |
2197 | if (of_property_read_bool(np, "mem-bus-interface-ahb1")) | |
2198 | pd->mem_buses |= PL08X_AHB1; | |
2199 | if (of_property_read_bool(np, "mem-bus-interface-ahb2")) | |
2200 | pd->mem_buses |= PL08X_AHB2; | |
2201 | if (!pd->mem_buses) { | |
2202 | dev_info(&adev->dev, "no bus masters for memory stated, assume all\n"); | |
2203 | pd->mem_buses |= PL08X_AHB1 | PL08X_AHB2; | |
2204 | } | |
2205 | ||
2206 | /* Parse the memcpy channel properties */ | |
2207 | ret = of_property_read_u32(np, "memcpy-burst-size", &val); | |
2208 | if (ret) { | |
2209 | dev_info(&adev->dev, "no memcpy burst size specified, using 1 byte\n"); | |
2210 | val = 1; | |
2211 | } | |
2212 | switch (val) { | |
2213 | default: | |
2214 | dev_err(&adev->dev, "illegal burst size for memcpy, set to 1\n"); | |
2215 | /* Fall through */ | |
2216 | case 1: | |
4166a56a | 2217 | pd->memcpy_burst_size = PL08X_BURST_SZ_1; |
aa4734da LW |
2218 | break; |
2219 | case 4: | |
4166a56a | 2220 | pd->memcpy_burst_size = PL08X_BURST_SZ_4; |
aa4734da LW |
2221 | break; |
2222 | case 8: | |
4166a56a | 2223 | pd->memcpy_burst_size = PL08X_BURST_SZ_8; |
aa4734da LW |
2224 | break; |
2225 | case 16: | |
4166a56a | 2226 | pd->memcpy_burst_size = PL08X_BURST_SZ_16; |
aa4734da LW |
2227 | break; |
2228 | case 32: | |
4166a56a | 2229 | pd->memcpy_burst_size = PL08X_BURST_SZ_32; |
aa4734da LW |
2230 | break; |
2231 | case 64: | |
4166a56a | 2232 | pd->memcpy_burst_size = PL08X_BURST_SZ_64; |
aa4734da LW |
2233 | break; |
2234 | case 128: | |
4166a56a | 2235 | pd->memcpy_burst_size = PL08X_BURST_SZ_128; |
aa4734da LW |
2236 | break; |
2237 | case 256: | |
4166a56a | 2238 | pd->memcpy_burst_size = PL08X_BURST_SZ_256; |
aa4734da LW |
2239 | break; |
2240 | } | |
2241 | ||
2242 | ret = of_property_read_u32(np, "memcpy-bus-width", &val); | |
2243 | if (ret) { | |
2244 | dev_info(&adev->dev, "no memcpy bus width specified, using 8 bits\n"); | |
2245 | val = 8; | |
2246 | } | |
2247 | switch (val) { | |
2248 | default: | |
2249 | dev_err(&adev->dev, "illegal bus width for memcpy, set to 8 bits\n"); | |
2250 | /* Fall through */ | |
2251 | case 8: | |
4166a56a | 2252 | pd->memcpy_bus_width = PL08X_BUS_WIDTH_8_BITS; |
aa4734da LW |
2253 | break; |
2254 | case 16: | |
4166a56a | 2255 | pd->memcpy_bus_width = PL08X_BUS_WIDTH_16_BITS; |
aa4734da LW |
2256 | break; |
2257 | case 32: | |
4166a56a | 2258 | pd->memcpy_bus_width = PL08X_BUS_WIDTH_32_BITS; |
aa4734da LW |
2259 | break; |
2260 | } | |
2261 | ||
f9cd4761 LW |
2262 | /* |
2263 | * Allocate channel data for all possible slave channels (one | |
2264 | * for each possible signal), channels will then be allocated | |
2265 | * for a device and have it's AHB interfaces set up at | |
2266 | * translation time. | |
2267 | */ | |
2268 | chanp = devm_kcalloc(&adev->dev, | |
2269 | pl08x->vd->signals, | |
2270 | sizeof(struct pl08x_channel_data), | |
2271 | GFP_KERNEL); | |
2272 | if (!chanp) | |
2273 | return -ENOMEM; | |
2274 | ||
2275 | pd->slave_channels = chanp; | |
2276 | for (i = 0; i < pl08x->vd->signals; i++) { | |
2277 | /* chanp->periph_buses will be assigned at translation */ | |
2278 | chanp->bus_id = kasprintf(GFP_KERNEL, "slave%d", i); | |
2279 | chanp++; | |
2280 | } | |
2281 | pd->num_slave_channels = pl08x->vd->signals; | |
2282 | ||
aa4734da LW |
2283 | pl08x->pd = pd; |
2284 | ||
2285 | return of_dma_controller_register(adev->dev.of_node, pl08x_of_xlate, | |
2286 | pl08x); | |
2287 | } | |
2288 | #else | |
2289 | static inline int pl08x_of_probe(struct amba_device *adev, | |
2290 | struct pl08x_driver_data *pl08x, | |
2291 | struct device_node *np) | |
2292 | { | |
2293 | return -EINVAL; | |
2294 | } | |
2295 | #endif | |
2296 | ||
aa25afad | 2297 | static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) |
e8689e63 LW |
2298 | { |
2299 | struct pl08x_driver_data *pl08x; | |
f96ca9ec | 2300 | const struct vendor_data *vd = id->data; |
aa4734da | 2301 | struct device_node *np = adev->dev.of_node; |
ba6785ff | 2302 | u32 tsfr_size; |
e8689e63 LW |
2303 | int ret = 0; |
2304 | int i; | |
2305 | ||
2306 | ret = amba_request_regions(adev, NULL); | |
2307 | if (ret) | |
2308 | return ret; | |
2309 | ||
de1a2419 RK |
2310 | /* Ensure that we can do DMA */ |
2311 | ret = dma_set_mask_and_coherent(&adev->dev, DMA_BIT_MASK(32)); | |
2312 | if (ret) | |
2313 | goto out_no_pl08x; | |
2314 | ||
e8689e63 | 2315 | /* Create the driver state holder */ |
b201c111 | 2316 | pl08x = kzalloc(sizeof(*pl08x), GFP_KERNEL); |
e8689e63 LW |
2317 | if (!pl08x) { |
2318 | ret = -ENOMEM; | |
2319 | goto out_no_pl08x; | |
2320 | } | |
2321 | ||
f9cd4761 LW |
2322 | /* Assign useful pointers to the driver state */ |
2323 | pl08x->adev = adev; | |
2324 | pl08x->vd = vd; | |
2325 | ||
e8689e63 LW |
2326 | /* Initialize memcpy engine */ |
2327 | dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask); | |
2328 | pl08x->memcpy.dev = &adev->dev; | |
e8689e63 LW |
2329 | pl08x->memcpy.device_free_chan_resources = pl08x_free_chan_resources; |
2330 | pl08x->memcpy.device_prep_dma_memcpy = pl08x_prep_dma_memcpy; | |
2331 | pl08x->memcpy.device_prep_dma_interrupt = pl08x_prep_dma_interrupt; | |
2332 | pl08x->memcpy.device_tx_status = pl08x_dma_tx_status; | |
2333 | pl08x->memcpy.device_issue_pending = pl08x_issue_pending; | |
bcd1b0b9 MR |
2334 | pl08x->memcpy.device_config = pl08x_config; |
2335 | pl08x->memcpy.device_pause = pl08x_pause; | |
2336 | pl08x->memcpy.device_resume = pl08x_resume; | |
2337 | pl08x->memcpy.device_terminate_all = pl08x_terminate_all; | |
ea524c7e MB |
2338 | pl08x->memcpy.src_addr_widths = PL80X_DMA_BUSWIDTHS; |
2339 | pl08x->memcpy.dst_addr_widths = PL80X_DMA_BUSWIDTHS; | |
2340 | pl08x->memcpy.directions = BIT(DMA_MEM_TO_MEM); | |
2341 | pl08x->memcpy.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT; | |
e8689e63 LW |
2342 | |
2343 | /* Initialize slave engine */ | |
2344 | dma_cap_set(DMA_SLAVE, pl08x->slave.cap_mask); | |
3b24c20b | 2345 | dma_cap_set(DMA_CYCLIC, pl08x->slave.cap_mask); |
e8689e63 | 2346 | pl08x->slave.dev = &adev->dev; |
e8689e63 LW |
2347 | pl08x->slave.device_free_chan_resources = pl08x_free_chan_resources; |
2348 | pl08x->slave.device_prep_dma_interrupt = pl08x_prep_dma_interrupt; | |
2349 | pl08x->slave.device_tx_status = pl08x_dma_tx_status; | |
2350 | pl08x->slave.device_issue_pending = pl08x_issue_pending; | |
2351 | pl08x->slave.device_prep_slave_sg = pl08x_prep_slave_sg; | |
3b24c20b | 2352 | pl08x->slave.device_prep_dma_cyclic = pl08x_prep_dma_cyclic; |
bcd1b0b9 MR |
2353 | pl08x->slave.device_config = pl08x_config; |
2354 | pl08x->slave.device_pause = pl08x_pause; | |
2355 | pl08x->slave.device_resume = pl08x_resume; | |
2356 | pl08x->slave.device_terminate_all = pl08x_terminate_all; | |
ea524c7e MB |
2357 | pl08x->slave.src_addr_widths = PL80X_DMA_BUSWIDTHS; |
2358 | pl08x->slave.dst_addr_widths = PL80X_DMA_BUSWIDTHS; | |
2359 | pl08x->slave.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); | |
2360 | pl08x->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT; | |
e8689e63 LW |
2361 | |
2362 | /* Get the platform data */ | |
2363 | pl08x->pd = dev_get_platdata(&adev->dev); | |
2364 | if (!pl08x->pd) { | |
aa4734da LW |
2365 | if (np) { |
2366 | ret = pl08x_of_probe(adev, pl08x, np); | |
2367 | if (ret) | |
2368 | goto out_no_platdata; | |
2369 | } else { | |
2370 | dev_err(&adev->dev, "no platform data supplied\n"); | |
2371 | ret = -EINVAL; | |
2372 | goto out_no_platdata; | |
2373 | } | |
da6f8ca1 SN |
2374 | } else { |
2375 | pl08x->slave.filter.map = pl08x->pd->slave_map; | |
2376 | pl08x->slave.filter.mapcnt = pl08x->pd->slave_map_len; | |
2377 | pl08x->slave.filter.fn = pl08x_filter_fn; | |
e8689e63 LW |
2378 | } |
2379 | ||
30749cb4 RKAL |
2380 | /* By default, AHB1 only. If dualmaster, from platform */ |
2381 | pl08x->lli_buses = PL08X_AHB1; | |
2382 | pl08x->mem_buses = PL08X_AHB1; | |
2383 | if (pl08x->vd->dualmaster) { | |
2384 | pl08x->lli_buses = pl08x->pd->lli_buses; | |
2385 | pl08x->mem_buses = pl08x->pd->mem_buses; | |
2386 | } | |
2387 | ||
da1b6c05 TF |
2388 | if (vd->pl080s) |
2389 | pl08x->lli_words = PL080S_LLI_WORDS; | |
2390 | else | |
2391 | pl08x->lli_words = PL080_LLI_WORDS; | |
ba6785ff TF |
2392 | tsfr_size = MAX_NUM_TSFR_LLIS * pl08x->lli_words * sizeof(u32); |
2393 | ||
e8689e63 LW |
2394 | /* A DMA memory pool for LLIs, align on 1-byte boundary */ |
2395 | pl08x->pool = dma_pool_create(DRIVER_NAME, &pl08x->adev->dev, | |
ba6785ff | 2396 | tsfr_size, PL08X_ALIGN, 0); |
e8689e63 LW |
2397 | if (!pl08x->pool) { |
2398 | ret = -ENOMEM; | |
2399 | goto out_no_lli_pool; | |
2400 | } | |
2401 | ||
e8689e63 LW |
2402 | pl08x->base = ioremap(adev->res.start, resource_size(&adev->res)); |
2403 | if (!pl08x->base) { | |
2404 | ret = -ENOMEM; | |
2405 | goto out_no_ioremap; | |
2406 | } | |
2407 | ||
2408 | /* Turn on the PL08x */ | |
2409 | pl08x_ensure_on(pl08x); | |
2410 | ||
94ae8522 | 2411 | /* Attach the interrupt handler */ |
e8689e63 LW |
2412 | writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR); |
2413 | writel(0x000000FF, pl08x->base + PL080_TC_CLEAR); | |
2414 | ||
174b537a | 2415 | ret = request_irq(adev->irq[0], pl08x_irq, 0, DRIVER_NAME, pl08x); |
e8689e63 LW |
2416 | if (ret) { |
2417 | dev_err(&adev->dev, "%s failed to request interrupt %d\n", | |
2418 | __func__, adev->irq[0]); | |
2419 | goto out_no_irq; | |
2420 | } | |
2421 | ||
2422 | /* Initialize physical channels */ | |
affa115e | 2423 | pl08x->phy_chans = kzalloc((vd->channels * sizeof(*pl08x->phy_chans)), |
e8689e63 LW |
2424 | GFP_KERNEL); |
2425 | if (!pl08x->phy_chans) { | |
983d7beb | 2426 | ret = -ENOMEM; |
e8689e63 LW |
2427 | goto out_no_phychans; |
2428 | } | |
2429 | ||
2430 | for (i = 0; i < vd->channels; i++) { | |
2431 | struct pl08x_phy_chan *ch = &pl08x->phy_chans[i]; | |
2432 | ||
2433 | ch->id = i; | |
2434 | ch->base = pl08x->base + PL080_Cx_BASE(i); | |
d86ccea7 | 2435 | ch->reg_config = ch->base + vd->config_offset; |
e8689e63 | 2436 | spin_lock_init(&ch->lock); |
affa115e LW |
2437 | |
2438 | /* | |
2439 | * Nomadik variants can have channels that are locked | |
2440 | * down for the secure world only. Lock up these channels | |
2441 | * by perpetually serving a dummy virtual channel. | |
2442 | */ | |
2443 | if (vd->nomadik) { | |
2444 | u32 val; | |
2445 | ||
d86ccea7 | 2446 | val = readl(ch->reg_config); |
affa115e LW |
2447 | if (val & (PL080N_CONFIG_ITPROT | PL080N_CONFIG_SECPROT)) { |
2448 | dev_info(&adev->dev, "physical channel %d reserved for secure access only\n", i); | |
2449 | ch->locked = true; | |
2450 | } | |
2451 | } | |
2452 | ||
175a5e61 VK |
2453 | dev_dbg(&adev->dev, "physical channel %d is %s\n", |
2454 | i, pl08x_phy_channel_busy(ch) ? "BUSY" : "FREE"); | |
e8689e63 LW |
2455 | } |
2456 | ||
2457 | /* Register as many memcpy channels as there are physical channels */ | |
2458 | ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->memcpy, | |
2459 | pl08x->vd->channels, false); | |
2460 | if (ret <= 0) { | |
2461 | dev_warn(&pl08x->adev->dev, | |
2462 | "%s failed to enumerate memcpy channels - %d\n", | |
2463 | __func__, ret); | |
2464 | goto out_no_memcpy; | |
2465 | } | |
e8689e63 LW |
2466 | |
2467 | /* Register slave channels */ | |
2468 | ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->slave, | |
3e27ee84 | 2469 | pl08x->pd->num_slave_channels, true); |
1080411c | 2470 | if (ret < 0) { |
e8689e63 LW |
2471 | dev_warn(&pl08x->adev->dev, |
2472 | "%s failed to enumerate slave channels - %d\n", | |
2473 | __func__, ret); | |
2474 | goto out_no_slave; | |
2475 | } | |
e8689e63 LW |
2476 | |
2477 | ret = dma_async_device_register(&pl08x->memcpy); | |
2478 | if (ret) { | |
2479 | dev_warn(&pl08x->adev->dev, | |
2480 | "%s failed to register memcpy as an async device - %d\n", | |
2481 | __func__, ret); | |
2482 | goto out_no_memcpy_reg; | |
2483 | } | |
2484 | ||
2485 | ret = dma_async_device_register(&pl08x->slave); | |
2486 | if (ret) { | |
2487 | dev_warn(&pl08x->adev->dev, | |
2488 | "%s failed to register slave as an async device - %d\n", | |
2489 | __func__, ret); | |
2490 | goto out_no_slave_reg; | |
2491 | } | |
2492 | ||
2493 | amba_set_drvdata(adev, pl08x); | |
2494 | init_pl08x_debugfs(pl08x); | |
da1b6c05 TF |
2495 | dev_info(&pl08x->adev->dev, "DMA: PL%03x%s rev%u at 0x%08llx irq %d\n", |
2496 | amba_part(adev), pl08x->vd->pl080s ? "s" : "", amba_rev(adev), | |
b05cd8f4 | 2497 | (unsigned long long)adev->res.start, adev->irq[0]); |
b7b6018b | 2498 | |
e8689e63 LW |
2499 | return 0; |
2500 | ||
2501 | out_no_slave_reg: | |
2502 | dma_async_device_unregister(&pl08x->memcpy); | |
2503 | out_no_memcpy_reg: | |
2504 | pl08x_free_virtual_channels(&pl08x->slave); | |
2505 | out_no_slave: | |
2506 | pl08x_free_virtual_channels(&pl08x->memcpy); | |
2507 | out_no_memcpy: | |
2508 | kfree(pl08x->phy_chans); | |
2509 | out_no_phychans: | |
2510 | free_irq(adev->irq[0], pl08x); | |
2511 | out_no_irq: | |
2512 | iounmap(pl08x->base); | |
2513 | out_no_ioremap: | |
2514 | dma_pool_destroy(pl08x->pool); | |
2515 | out_no_lli_pool: | |
2516 | out_no_platdata: | |
2517 | kfree(pl08x); | |
2518 | out_no_pl08x: | |
2519 | amba_release_regions(adev); | |
2520 | return ret; | |
2521 | } | |
2522 | ||
2523 | /* PL080 has 8 channels and the PL080 have just 2 */ | |
2524 | static struct vendor_data vendor_pl080 = { | |
d86ccea7 | 2525 | .config_offset = PL080_CH_CONFIG, |
e8689e63 | 2526 | .channels = 8, |
f9cd4761 | 2527 | .signals = 16, |
e8689e63 | 2528 | .dualmaster = true, |
5110e51d | 2529 | .max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK, |
e8689e63 LW |
2530 | }; |
2531 | ||
affa115e | 2532 | static struct vendor_data vendor_nomadik = { |
d86ccea7 | 2533 | .config_offset = PL080_CH_CONFIG, |
affa115e | 2534 | .channels = 8, |
f9cd4761 | 2535 | .signals = 32, |
affa115e LW |
2536 | .dualmaster = true, |
2537 | .nomadik = true, | |
5110e51d | 2538 | .max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK, |
affa115e LW |
2539 | }; |
2540 | ||
da1b6c05 TF |
2541 | static struct vendor_data vendor_pl080s = { |
2542 | .config_offset = PL080S_CH_CONFIG, | |
2543 | .channels = 8, | |
f9cd4761 | 2544 | .signals = 32, |
da1b6c05 | 2545 | .pl080s = true, |
5110e51d | 2546 | .max_transfer_size = PL080S_CONTROL_TRANSFER_SIZE_MASK, |
affa115e LW |
2547 | }; |
2548 | ||
e8689e63 | 2549 | static struct vendor_data vendor_pl081 = { |
d86ccea7 | 2550 | .config_offset = PL080_CH_CONFIG, |
e8689e63 | 2551 | .channels = 2, |
f9cd4761 | 2552 | .signals = 16, |
e8689e63 | 2553 | .dualmaster = false, |
5110e51d | 2554 | .max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK, |
e8689e63 LW |
2555 | }; |
2556 | ||
2557 | static struct amba_id pl08x_ids[] = { | |
da1b6c05 TF |
2558 | /* Samsung PL080S variant */ |
2559 | { | |
2560 | .id = 0x0a141080, | |
2561 | .mask = 0xffffffff, | |
2562 | .data = &vendor_pl080s, | |
2563 | }, | |
e8689e63 LW |
2564 | /* PL080 */ |
2565 | { | |
2566 | .id = 0x00041080, | |
2567 | .mask = 0x000fffff, | |
2568 | .data = &vendor_pl080, | |
2569 | }, | |
2570 | /* PL081 */ | |
2571 | { | |
2572 | .id = 0x00041081, | |
2573 | .mask = 0x000fffff, | |
2574 | .data = &vendor_pl081, | |
2575 | }, | |
2576 | /* Nomadik 8815 PL080 variant */ | |
2577 | { | |
affa115e | 2578 | .id = 0x00280080, |
e8689e63 | 2579 | .mask = 0x00ffffff, |
affa115e | 2580 | .data = &vendor_nomadik, |
e8689e63 LW |
2581 | }, |
2582 | { 0, 0 }, | |
2583 | }; | |
2584 | ||
037566df DM |
2585 | MODULE_DEVICE_TABLE(amba, pl08x_ids); |
2586 | ||
e8689e63 LW |
2587 | static struct amba_driver pl08x_amba_driver = { |
2588 | .drv.name = DRIVER_NAME, | |
2589 | .id_table = pl08x_ids, | |
2590 | .probe = pl08x_probe, | |
2591 | }; | |
2592 | ||
2593 | static int __init pl08x_init(void) | |
2594 | { | |
2595 | int retval; | |
2596 | retval = amba_driver_register(&pl08x_amba_driver); | |
2597 | if (retval) | |
2598 | printk(KERN_WARNING DRIVER_NAME | |
e8b5e11d | 2599 | "failed to register as an AMBA device (%d)\n", |
e8689e63 LW |
2600 | retval); |
2601 | return retval; | |
2602 | } | |
2603 | subsys_initcall(pl08x_init); |