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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 | * | |
18 | * You should have received a copy of the GNU General Public License along with | |
19 | * this program; if not, write to the Free Software Foundation, Inc., 59 | |
20 | * Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
21 | * | |
94ae8522 RKAL |
22 | * The full GNU General Public License is in this distribution in the file |
23 | * called COPYING. | |
e8689e63 LW |
24 | * |
25 | * Documentation: ARM DDI 0196G == PL080 | |
94ae8522 | 26 | * Documentation: ARM DDI 0218E == PL081 |
e8689e63 | 27 | * |
94ae8522 RKAL |
28 | * PL080 & PL081 both have 16 sets of DMA signals that can be routed to any |
29 | * channel. | |
e8689e63 LW |
30 | * |
31 | * The PL080 has 8 channels available for simultaneous use, and the PL081 | |
32 | * has only two channels. So on these DMA controllers the number of channels | |
33 | * and the number of incoming DMA signals are two totally different things. | |
34 | * It is usually not possible to theoretically handle all physical signals, | |
35 | * so a multiplexing scheme with possible denial of use is necessary. | |
36 | * | |
37 | * The PL080 has a dual bus master, PL081 has a single master. | |
38 | * | |
39 | * Memory to peripheral transfer may be visualized as | |
40 | * Get data from memory to DMAC | |
41 | * Until no data left | |
42 | * On burst request from peripheral | |
43 | * Destination burst from DMAC to peripheral | |
44 | * Clear burst request | |
45 | * Raise terminal count interrupt | |
46 | * | |
47 | * For peripherals with a FIFO: | |
48 | * Source burst size == half the depth of the peripheral FIFO | |
49 | * Destination burst size == the depth of the peripheral FIFO | |
50 | * | |
51 | * (Bursts are irrelevant for mem to mem transfers - there are no burst | |
52 | * signals, the DMA controller will simply facilitate its AHB master.) | |
53 | * | |
54 | * ASSUMES default (little) endianness for DMA transfers | |
55 | * | |
9dc2c200 RKAL |
56 | * The PL08x has two flow control settings: |
57 | * - DMAC flow control: the transfer size defines the number of transfers | |
58 | * which occur for the current LLI entry, and the DMAC raises TC at the | |
59 | * end of every LLI entry. Observed behaviour shows the DMAC listening | |
60 | * to both the BREQ and SREQ signals (contrary to documented), | |
61 | * transferring data if either is active. The LBREQ and LSREQ signals | |
62 | * are ignored. | |
63 | * | |
64 | * - Peripheral flow control: the transfer size is ignored (and should be | |
65 | * zero). The data is transferred from the current LLI entry, until | |
66 | * after the final transfer signalled by LBREQ or LSREQ. The DMAC | |
67 | * will then move to the next LLI entry. | |
68 | * | |
e8689e63 LW |
69 | * Global TODO: |
70 | * - Break out common code from arch/arm/mach-s3c64xx and share | |
71 | */ | |
730404ac | 72 | #include <linux/amba/bus.h> |
e8689e63 LW |
73 | #include <linux/amba/pl08x.h> |
74 | #include <linux/debugfs.h> | |
0c38d701 VK |
75 | #include <linux/delay.h> |
76 | #include <linux/device.h> | |
77 | #include <linux/dmaengine.h> | |
78 | #include <linux/dmapool.h> | |
8516f52f | 79 | #include <linux/dma-mapping.h> |
0c38d701 VK |
80 | #include <linux/init.h> |
81 | #include <linux/interrupt.h> | |
82 | #include <linux/module.h> | |
b7b6018b | 83 | #include <linux/pm_runtime.h> |
e8689e63 | 84 | #include <linux/seq_file.h> |
0c38d701 | 85 | #include <linux/slab.h> |
e8689e63 | 86 | #include <asm/hardware/pl080.h> |
e8689e63 | 87 | |
d2ebfb33 RKAL |
88 | #include "dmaengine.h" |
89 | ||
e8689e63 LW |
90 | #define DRIVER_NAME "pl08xdmac" |
91 | ||
7703eac9 | 92 | static struct amba_driver pl08x_amba_driver; |
b23f204c | 93 | struct pl08x_driver_data; |
7703eac9 | 94 | |
e8689e63 | 95 | /** |
94ae8522 | 96 | * struct vendor_data - vendor-specific config parameters for PL08x derivatives |
e8689e63 | 97 | * @channels: the number of channels available in this variant |
94ae8522 | 98 | * @dualmaster: whether this version supports dual AHB masters or not. |
affa115e LW |
99 | * @nomadik: whether the channels have Nomadik security extension bits |
100 | * that need to be checked for permission before use and some registers are | |
101 | * missing | |
e8689e63 LW |
102 | */ |
103 | struct vendor_data { | |
e8689e63 LW |
104 | u8 channels; |
105 | bool dualmaster; | |
affa115e | 106 | bool nomadik; |
e8689e63 LW |
107 | }; |
108 | ||
109 | /* | |
110 | * PL08X private data structures | |
e8b5e11d | 111 | * An LLI struct - see PL08x TRM. Note that next uses bit[0] as a bus bit, |
e25761d7 RKAL |
112 | * start & end do not - their bus bit info is in cctl. Also note that these |
113 | * are fixed 32-bit quantities. | |
e8689e63 | 114 | */ |
7cb72ad9 | 115 | struct pl08x_lli { |
e25761d7 RKAL |
116 | u32 src; |
117 | u32 dst; | |
bfddfb45 | 118 | u32 lli; |
e8689e63 LW |
119 | u32 cctl; |
120 | }; | |
121 | ||
b23f204c RK |
122 | /** |
123 | * struct pl08x_bus_data - information of source or destination | |
124 | * busses for a transfer | |
125 | * @addr: current address | |
126 | * @maxwidth: the maximum width of a transfer on this bus | |
127 | * @buswidth: the width of this bus in bytes: 1, 2 or 4 | |
128 | */ | |
129 | struct pl08x_bus_data { | |
130 | dma_addr_t addr; | |
131 | u8 maxwidth; | |
132 | u8 buswidth; | |
133 | }; | |
134 | ||
135 | /** | |
136 | * struct pl08x_phy_chan - holder for the physical channels | |
137 | * @id: physical index to this channel | |
138 | * @lock: a lock to use when altering an instance of this struct | |
139 | * @signal: the physical signal (aka channel) serving this physical channel | |
140 | * right now | |
141 | * @serving: the virtual channel currently being served by this physical | |
142 | * channel | |
143 | */ | |
144 | struct pl08x_phy_chan { | |
145 | unsigned int id; | |
146 | void __iomem *base; | |
147 | spinlock_t lock; | |
148 | int signal; | |
149 | struct pl08x_dma_chan *serving; | |
150 | }; | |
151 | ||
152 | /** | |
153 | * struct pl08x_sg - structure containing data per sg | |
154 | * @src_addr: src address of sg | |
155 | * @dst_addr: dst address of sg | |
156 | * @len: transfer len in bytes | |
157 | * @node: node for txd's dsg_list | |
158 | */ | |
159 | struct pl08x_sg { | |
160 | dma_addr_t src_addr; | |
161 | dma_addr_t dst_addr; | |
162 | size_t len; | |
163 | struct list_head node; | |
164 | }; | |
165 | ||
166 | /** | |
167 | * struct pl08x_txd - wrapper for struct dma_async_tx_descriptor | |
168 | * @tx: async tx descriptor | |
169 | * @node: node for txd list for channels | |
170 | * @dsg_list: list of children sg's | |
171 | * @direction: direction of transfer | |
172 | * @llis_bus: DMA memory address (physical) start for the LLIs | |
173 | * @llis_va: virtual memory address start for the LLIs | |
174 | * @cctl: control reg values for current txd | |
175 | * @ccfg: config reg values for current txd | |
176 | */ | |
177 | struct pl08x_txd { | |
178 | struct dma_async_tx_descriptor tx; | |
179 | struct list_head node; | |
180 | struct list_head dsg_list; | |
181 | enum dma_transfer_direction direction; | |
182 | dma_addr_t llis_bus; | |
183 | struct pl08x_lli *llis_va; | |
184 | /* Default cctl value for LLIs */ | |
185 | u32 cctl; | |
186 | /* | |
187 | * Settings to be put into the physical channel when we | |
188 | * trigger this txd. Other registers are in llis_va[0]. | |
189 | */ | |
190 | u32 ccfg; | |
191 | }; | |
192 | ||
193 | /** | |
194 | * struct pl08x_dma_chan_state - holds the PL08x specific virtual channel | |
195 | * states | |
196 | * @PL08X_CHAN_IDLE: the channel is idle | |
197 | * @PL08X_CHAN_RUNNING: the channel has allocated a physical transport | |
198 | * channel and is running a transfer on it | |
199 | * @PL08X_CHAN_PAUSED: the channel has allocated a physical transport | |
200 | * channel, but the transfer is currently paused | |
201 | * @PL08X_CHAN_WAITING: the channel is waiting for a physical transport | |
202 | * channel to become available (only pertains to memcpy channels) | |
203 | */ | |
204 | enum pl08x_dma_chan_state { | |
205 | PL08X_CHAN_IDLE, | |
206 | PL08X_CHAN_RUNNING, | |
207 | PL08X_CHAN_PAUSED, | |
208 | PL08X_CHAN_WAITING, | |
209 | }; | |
210 | ||
211 | /** | |
212 | * struct pl08x_dma_chan - this structure wraps a DMA ENGINE channel | |
213 | * @chan: wrappped abstract channel | |
214 | * @phychan: the physical channel utilized by this channel, if there is one | |
215 | * @phychan_hold: if non-zero, hold on to the physical channel even if we | |
216 | * have no pending entries | |
217 | * @tasklet: tasklet scheduled by the IRQ to handle actual work etc | |
218 | * @name: name of channel | |
219 | * @cd: channel platform data | |
220 | * @runtime_addr: address for RX/TX according to the runtime config | |
b23f204c RK |
221 | * @pend_list: queued transactions pending on this channel |
222 | * @at: active transaction on this channel | |
223 | * @lock: a lock for this channel data | |
224 | * @host: a pointer to the host (internal use) | |
225 | * @state: whether the channel is idle, paused, running etc | |
226 | * @slave: whether this channel is a device (slave) or for memcpy | |
b23f204c RK |
227 | * @waiting: a TX descriptor on this channel which is waiting for a physical |
228 | * channel to become available | |
229 | */ | |
230 | struct pl08x_dma_chan { | |
231 | struct dma_chan chan; | |
232 | struct pl08x_phy_chan *phychan; | |
233 | int phychan_hold; | |
234 | struct tasklet_struct tasklet; | |
550ec36f | 235 | const char *name; |
b23f204c | 236 | const struct pl08x_channel_data *cd; |
ed91c13d | 237 | struct dma_slave_config cfg; |
b23f204c RK |
238 | struct list_head pend_list; |
239 | struct pl08x_txd *at; | |
240 | spinlock_t lock; | |
241 | struct pl08x_driver_data *host; | |
242 | enum pl08x_dma_chan_state state; | |
243 | bool slave; | |
b23f204c RK |
244 | struct pl08x_txd *waiting; |
245 | }; | |
246 | ||
e8689e63 LW |
247 | /** |
248 | * struct pl08x_driver_data - the local state holder for the PL08x | |
249 | * @slave: slave engine for this instance | |
250 | * @memcpy: memcpy engine for this instance | |
251 | * @base: virtual memory base (remapped) for the PL08x | |
252 | * @adev: the corresponding AMBA (PrimeCell) bus entry | |
253 | * @vd: vendor data for this PL08x variant | |
254 | * @pd: platform data passed in from the platform/machine | |
255 | * @phy_chans: array of data for the physical channels | |
256 | * @pool: a pool for the LLI descriptors | |
257 | * @pool_ctr: counter of LLIs in the pool | |
3e27ee84 VK |
258 | * @lli_buses: bitmask to or in to LLI pointer selecting AHB port for LLI |
259 | * fetches | |
30749cb4 | 260 | * @mem_buses: set to indicate memory transfers on AHB2. |
e8689e63 LW |
261 | * @lock: a spinlock for this struct |
262 | */ | |
263 | struct pl08x_driver_data { | |
264 | struct dma_device slave; | |
265 | struct dma_device memcpy; | |
266 | void __iomem *base; | |
267 | struct amba_device *adev; | |
f96ca9ec | 268 | const struct vendor_data *vd; |
e8689e63 LW |
269 | struct pl08x_platform_data *pd; |
270 | struct pl08x_phy_chan *phy_chans; | |
271 | struct dma_pool *pool; | |
272 | int pool_ctr; | |
30749cb4 RKAL |
273 | u8 lli_buses; |
274 | u8 mem_buses; | |
e8689e63 LW |
275 | }; |
276 | ||
277 | /* | |
278 | * PL08X specific defines | |
279 | */ | |
280 | ||
e8689e63 LW |
281 | /* Size (bytes) of each LLI buffer allocated for one transfer */ |
282 | # define PL08X_LLI_TSFR_SIZE 0x2000 | |
283 | ||
e8b5e11d | 284 | /* Maximum times we call dma_pool_alloc on this pool without freeing */ |
7cb72ad9 | 285 | #define MAX_NUM_TSFR_LLIS (PL08X_LLI_TSFR_SIZE/sizeof(struct pl08x_lli)) |
e8689e63 LW |
286 | #define PL08X_ALIGN 8 |
287 | ||
288 | static inline struct pl08x_dma_chan *to_pl08x_chan(struct dma_chan *chan) | |
289 | { | |
290 | return container_of(chan, struct pl08x_dma_chan, chan); | |
291 | } | |
292 | ||
501e67e8 RKAL |
293 | static inline struct pl08x_txd *to_pl08x_txd(struct dma_async_tx_descriptor *tx) |
294 | { | |
295 | return container_of(tx, struct pl08x_txd, tx); | |
296 | } | |
297 | ||
e8689e63 LW |
298 | /* |
299 | * Physical channel handling | |
300 | */ | |
301 | ||
302 | /* Whether a certain channel is busy or not */ | |
303 | static int pl08x_phy_channel_busy(struct pl08x_phy_chan *ch) | |
304 | { | |
305 | unsigned int val; | |
306 | ||
307 | val = readl(ch->base + PL080_CH_CONFIG); | |
308 | return val & PL080_CONFIG_ACTIVE; | |
309 | } | |
310 | ||
311 | /* | |
312 | * Set the initial DMA register values i.e. those for the first LLI | |
e8b5e11d | 313 | * The next LLI pointer and the configuration interrupt bit have |
c885bee4 RKAL |
314 | * been set when the LLIs were constructed. Poke them into the hardware |
315 | * and start the transfer. | |
e8689e63 | 316 | */ |
c885bee4 RKAL |
317 | static void pl08x_start_txd(struct pl08x_dma_chan *plchan, |
318 | struct pl08x_txd *txd) | |
e8689e63 | 319 | { |
c885bee4 | 320 | struct pl08x_driver_data *pl08x = plchan->host; |
e8689e63 | 321 | struct pl08x_phy_chan *phychan = plchan->phychan; |
19524d77 | 322 | struct pl08x_lli *lli = &txd->llis_va[0]; |
09b3c323 | 323 | u32 val; |
c885bee4 RKAL |
324 | |
325 | plchan->at = txd; | |
e8689e63 | 326 | |
c885bee4 RKAL |
327 | /* Wait for channel inactive */ |
328 | while (pl08x_phy_channel_busy(phychan)) | |
329 | cpu_relax(); | |
e8689e63 | 330 | |
c885bee4 RKAL |
331 | dev_vdbg(&pl08x->adev->dev, |
332 | "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, " | |
19524d77 RKAL |
333 | "clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n", |
334 | phychan->id, lli->src, lli->dst, lli->lli, lli->cctl, | |
09b3c323 | 335 | txd->ccfg); |
19524d77 RKAL |
336 | |
337 | writel(lli->src, phychan->base + PL080_CH_SRC_ADDR); | |
338 | writel(lli->dst, phychan->base + PL080_CH_DST_ADDR); | |
339 | writel(lli->lli, phychan->base + PL080_CH_LLI); | |
340 | writel(lli->cctl, phychan->base + PL080_CH_CONTROL); | |
09b3c323 | 341 | writel(txd->ccfg, phychan->base + PL080_CH_CONFIG); |
c885bee4 RKAL |
342 | |
343 | /* Enable the DMA channel */ | |
344 | /* Do not access config register until channel shows as disabled */ | |
345 | while (readl(pl08x->base + PL080_EN_CHAN) & (1 << phychan->id)) | |
19386b32 | 346 | cpu_relax(); |
e8689e63 | 347 | |
c885bee4 RKAL |
348 | /* Do not access config register until channel shows as inactive */ |
349 | val = readl(phychan->base + PL080_CH_CONFIG); | |
e8689e63 | 350 | while ((val & PL080_CONFIG_ACTIVE) || (val & PL080_CONFIG_ENABLE)) |
c885bee4 | 351 | val = readl(phychan->base + PL080_CH_CONFIG); |
e8689e63 | 352 | |
c885bee4 | 353 | writel(val | PL080_CONFIG_ENABLE, phychan->base + PL080_CH_CONFIG); |
e8689e63 LW |
354 | } |
355 | ||
356 | /* | |
81796616 | 357 | * Pause the channel by setting the HALT bit. |
e8689e63 | 358 | * |
81796616 RKAL |
359 | * For M->P transfers, pause the DMAC first and then stop the peripheral - |
360 | * the FIFO can only drain if the peripheral is still requesting data. | |
361 | * (note: this can still timeout if the DMAC FIFO never drains of data.) | |
e8689e63 | 362 | * |
81796616 RKAL |
363 | * For P->M transfers, disable the peripheral first to stop it filling |
364 | * the DMAC FIFO, and then pause the DMAC. | |
e8689e63 LW |
365 | */ |
366 | static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch) | |
367 | { | |
368 | u32 val; | |
81796616 | 369 | int timeout; |
e8689e63 LW |
370 | |
371 | /* Set the HALT bit and wait for the FIFO to drain */ | |
372 | val = readl(ch->base + PL080_CH_CONFIG); | |
373 | val |= PL080_CONFIG_HALT; | |
374 | writel(val, ch->base + PL080_CH_CONFIG); | |
375 | ||
376 | /* Wait for channel inactive */ | |
81796616 RKAL |
377 | for (timeout = 1000; timeout; timeout--) { |
378 | if (!pl08x_phy_channel_busy(ch)) | |
379 | break; | |
380 | udelay(1); | |
381 | } | |
382 | if (pl08x_phy_channel_busy(ch)) | |
383 | pr_err("pl08x: channel%u timeout waiting for pause\n", ch->id); | |
e8689e63 LW |
384 | } |
385 | ||
386 | static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch) | |
387 | { | |
388 | u32 val; | |
389 | ||
390 | /* Clear the HALT bit */ | |
391 | val = readl(ch->base + PL080_CH_CONFIG); | |
392 | val &= ~PL080_CONFIG_HALT; | |
393 | writel(val, ch->base + PL080_CH_CONFIG); | |
394 | } | |
395 | ||
fb526210 RKAL |
396 | /* |
397 | * pl08x_terminate_phy_chan() stops the channel, clears the FIFO and | |
398 | * clears any pending interrupt status. This should not be used for | |
399 | * an on-going transfer, but as a method of shutting down a channel | |
400 | * (eg, when it's no longer used) or terminating a transfer. | |
401 | */ | |
402 | static void pl08x_terminate_phy_chan(struct pl08x_driver_data *pl08x, | |
403 | struct pl08x_phy_chan *ch) | |
e8689e63 | 404 | { |
fb526210 | 405 | u32 val = readl(ch->base + PL080_CH_CONFIG); |
e8689e63 | 406 | |
fb526210 RKAL |
407 | val &= ~(PL080_CONFIG_ENABLE | PL080_CONFIG_ERR_IRQ_MASK | |
408 | PL080_CONFIG_TC_IRQ_MASK); | |
e8689e63 | 409 | |
e8689e63 | 410 | writel(val, ch->base + PL080_CH_CONFIG); |
fb526210 RKAL |
411 | |
412 | writel(1 << ch->id, pl08x->base + PL080_ERR_CLEAR); | |
413 | writel(1 << ch->id, pl08x->base + PL080_TC_CLEAR); | |
e8689e63 LW |
414 | } |
415 | ||
416 | static inline u32 get_bytes_in_cctl(u32 cctl) | |
417 | { | |
418 | /* The source width defines the number of bytes */ | |
419 | u32 bytes = cctl & PL080_CONTROL_TRANSFER_SIZE_MASK; | |
420 | ||
421 | switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) { | |
422 | case PL080_WIDTH_8BIT: | |
423 | break; | |
424 | case PL080_WIDTH_16BIT: | |
425 | bytes *= 2; | |
426 | break; | |
427 | case PL080_WIDTH_32BIT: | |
428 | bytes *= 4; | |
429 | break; | |
430 | } | |
431 | return bytes; | |
432 | } | |
433 | ||
434 | /* The channel should be paused when calling this */ | |
435 | static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan) | |
436 | { | |
437 | struct pl08x_phy_chan *ch; | |
e8689e63 LW |
438 | struct pl08x_txd *txd; |
439 | unsigned long flags; | |
cace6585 | 440 | size_t bytes = 0; |
e8689e63 LW |
441 | |
442 | spin_lock_irqsave(&plchan->lock, flags); | |
e8689e63 LW |
443 | ch = plchan->phychan; |
444 | txd = plchan->at; | |
445 | ||
446 | /* | |
db9f136a RKAL |
447 | * Follow the LLIs to get the number of remaining |
448 | * bytes in the currently active transaction. | |
e8689e63 LW |
449 | */ |
450 | if (ch && txd) { | |
4c0df6a3 | 451 | u32 clli = readl(ch->base + PL080_CH_LLI) & ~PL080_LLI_LM_AHB2; |
e8689e63 | 452 | |
db9f136a | 453 | /* First get the remaining bytes in the active transfer */ |
e8689e63 LW |
454 | bytes = get_bytes_in_cctl(readl(ch->base + PL080_CH_CONTROL)); |
455 | ||
456 | if (clli) { | |
db9f136a RKAL |
457 | struct pl08x_lli *llis_va = txd->llis_va; |
458 | dma_addr_t llis_bus = txd->llis_bus; | |
459 | int index; | |
460 | ||
461 | BUG_ON(clli < llis_bus || clli >= llis_bus + | |
462 | sizeof(struct pl08x_lli) * MAX_NUM_TSFR_LLIS); | |
e8689e63 | 463 | |
db9f136a RKAL |
464 | /* |
465 | * Locate the next LLI - as this is an array, | |
466 | * it's simple maths to find. | |
467 | */ | |
468 | index = (clli - llis_bus) / sizeof(struct pl08x_lli); | |
469 | ||
470 | for (; index < MAX_NUM_TSFR_LLIS; index++) { | |
471 | bytes += get_bytes_in_cctl(llis_va[index].cctl); | |
e8689e63 | 472 | |
e8689e63 | 473 | /* |
e8b5e11d | 474 | * A LLI pointer of 0 terminates the LLI list |
e8689e63 | 475 | */ |
db9f136a RKAL |
476 | if (!llis_va[index].lli) |
477 | break; | |
e8689e63 LW |
478 | } |
479 | } | |
480 | } | |
481 | ||
482 | /* Sum up all queued transactions */ | |
15c17232 | 483 | if (!list_empty(&plchan->pend_list)) { |
db9f136a | 484 | struct pl08x_txd *txdi; |
15c17232 | 485 | list_for_each_entry(txdi, &plchan->pend_list, node) { |
b7f69d9d VK |
486 | struct pl08x_sg *dsg; |
487 | list_for_each_entry(dsg, &txd->dsg_list, node) | |
488 | bytes += dsg->len; | |
e8689e63 | 489 | } |
e8689e63 LW |
490 | } |
491 | ||
492 | spin_unlock_irqrestore(&plchan->lock, flags); | |
493 | ||
494 | return bytes; | |
495 | } | |
496 | ||
497 | /* | |
498 | * Allocate a physical channel for a virtual channel | |
94ae8522 RKAL |
499 | * |
500 | * Try to locate a physical channel to be used for this transfer. If all | |
501 | * are taken return NULL and the requester will have to cope by using | |
502 | * some fallback PIO mode or retrying later. | |
e8689e63 LW |
503 | */ |
504 | static struct pl08x_phy_chan * | |
505 | pl08x_get_phy_channel(struct pl08x_driver_data *pl08x, | |
506 | struct pl08x_dma_chan *virt_chan) | |
507 | { | |
508 | struct pl08x_phy_chan *ch = NULL; | |
509 | unsigned long flags; | |
510 | int i; | |
511 | ||
e8689e63 LW |
512 | for (i = 0; i < pl08x->vd->channels; i++) { |
513 | ch = &pl08x->phy_chans[i]; | |
514 | ||
515 | spin_lock_irqsave(&ch->lock, flags); | |
516 | ||
affa115e | 517 | if (!ch->locked && !ch->serving) { |
e8689e63 LW |
518 | ch->serving = virt_chan; |
519 | ch->signal = -1; | |
520 | spin_unlock_irqrestore(&ch->lock, flags); | |
521 | break; | |
522 | } | |
523 | ||
524 | spin_unlock_irqrestore(&ch->lock, flags); | |
525 | } | |
526 | ||
527 | if (i == pl08x->vd->channels) { | |
528 | /* No physical channel available, cope with it */ | |
529 | return NULL; | |
530 | } | |
531 | ||
532 | return ch; | |
533 | } | |
534 | ||
535 | static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x, | |
536 | struct pl08x_phy_chan *ch) | |
537 | { | |
538 | unsigned long flags; | |
539 | ||
fb526210 RKAL |
540 | spin_lock_irqsave(&ch->lock, flags); |
541 | ||
e8689e63 | 542 | /* Stop the channel and clear its interrupts */ |
fb526210 | 543 | pl08x_terminate_phy_chan(pl08x, ch); |
e8689e63 LW |
544 | |
545 | /* Mark it as free */ | |
e8689e63 LW |
546 | ch->serving = NULL; |
547 | spin_unlock_irqrestore(&ch->lock, flags); | |
548 | } | |
549 | ||
550 | /* | |
551 | * LLI handling | |
552 | */ | |
553 | ||
554 | static inline unsigned int pl08x_get_bytes_for_cctl(unsigned int coded) | |
555 | { | |
556 | switch (coded) { | |
557 | case PL080_WIDTH_8BIT: | |
558 | return 1; | |
559 | case PL080_WIDTH_16BIT: | |
560 | return 2; | |
561 | case PL080_WIDTH_32BIT: | |
562 | return 4; | |
563 | default: | |
564 | break; | |
565 | } | |
566 | BUG(); | |
567 | return 0; | |
568 | } | |
569 | ||
570 | static inline u32 pl08x_cctl_bits(u32 cctl, u8 srcwidth, u8 dstwidth, | |
cace6585 | 571 | size_t tsize) |
e8689e63 LW |
572 | { |
573 | u32 retbits = cctl; | |
574 | ||
e8b5e11d | 575 | /* Remove all src, dst and transfer size bits */ |
e8689e63 LW |
576 | retbits &= ~PL080_CONTROL_DWIDTH_MASK; |
577 | retbits &= ~PL080_CONTROL_SWIDTH_MASK; | |
578 | retbits &= ~PL080_CONTROL_TRANSFER_SIZE_MASK; | |
579 | ||
580 | /* Then set the bits according to the parameters */ | |
581 | switch (srcwidth) { | |
582 | case 1: | |
583 | retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
584 | break; | |
585 | case 2: | |
586 | retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
587 | break; | |
588 | case 4: | |
589 | retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
590 | break; | |
591 | default: | |
592 | BUG(); | |
593 | break; | |
594 | } | |
595 | ||
596 | switch (dstwidth) { | |
597 | case 1: | |
598 | retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
599 | break; | |
600 | case 2: | |
601 | retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
602 | break; | |
603 | case 4: | |
604 | retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
605 | break; | |
606 | default: | |
607 | BUG(); | |
608 | break; | |
609 | } | |
610 | ||
611 | retbits |= tsize << PL080_CONTROL_TRANSFER_SIZE_SHIFT; | |
612 | return retbits; | |
613 | } | |
614 | ||
542361f8 RKAL |
615 | struct pl08x_lli_build_data { |
616 | struct pl08x_txd *txd; | |
542361f8 RKAL |
617 | struct pl08x_bus_data srcbus; |
618 | struct pl08x_bus_data dstbus; | |
619 | size_t remainder; | |
25c94f7f | 620 | u32 lli_bus; |
542361f8 RKAL |
621 | }; |
622 | ||
e8689e63 | 623 | /* |
0532e6fc VK |
624 | * Autoselect a master bus to use for the transfer. Slave will be the chosen as |
625 | * victim in case src & dest are not similarly aligned. i.e. If after aligning | |
626 | * masters address with width requirements of transfer (by sending few byte by | |
627 | * byte data), slave is still not aligned, then its width will be reduced to | |
628 | * BYTE. | |
629 | * - prefers the destination bus if both available | |
036f05fd | 630 | * - prefers bus with fixed address (i.e. peripheral) |
e8689e63 | 631 | */ |
542361f8 RKAL |
632 | static void pl08x_choose_master_bus(struct pl08x_lli_build_data *bd, |
633 | struct pl08x_bus_data **mbus, struct pl08x_bus_data **sbus, u32 cctl) | |
e8689e63 LW |
634 | { |
635 | if (!(cctl & PL080_CONTROL_DST_INCR)) { | |
542361f8 RKAL |
636 | *mbus = &bd->dstbus; |
637 | *sbus = &bd->srcbus; | |
036f05fd VK |
638 | } else if (!(cctl & PL080_CONTROL_SRC_INCR)) { |
639 | *mbus = &bd->srcbus; | |
640 | *sbus = &bd->dstbus; | |
e8689e63 | 641 | } else { |
036f05fd | 642 | if (bd->dstbus.buswidth >= bd->srcbus.buswidth) { |
542361f8 RKAL |
643 | *mbus = &bd->dstbus; |
644 | *sbus = &bd->srcbus; | |
036f05fd | 645 | } else { |
542361f8 RKAL |
646 | *mbus = &bd->srcbus; |
647 | *sbus = &bd->dstbus; | |
e8689e63 LW |
648 | } |
649 | } | |
650 | } | |
651 | ||
652 | /* | |
94ae8522 | 653 | * Fills in one LLI for a certain transfer descriptor and advance the counter |
e8689e63 | 654 | */ |
542361f8 RKAL |
655 | static void pl08x_fill_lli_for_desc(struct pl08x_lli_build_data *bd, |
656 | int num_llis, int len, u32 cctl) | |
e8689e63 | 657 | { |
542361f8 RKAL |
658 | struct pl08x_lli *llis_va = bd->txd->llis_va; |
659 | dma_addr_t llis_bus = bd->txd->llis_bus; | |
e8689e63 LW |
660 | |
661 | BUG_ON(num_llis >= MAX_NUM_TSFR_LLIS); | |
662 | ||
30749cb4 | 663 | llis_va[num_llis].cctl = cctl; |
542361f8 RKAL |
664 | llis_va[num_llis].src = bd->srcbus.addr; |
665 | llis_va[num_llis].dst = bd->dstbus.addr; | |
3e27ee84 VK |
666 | llis_va[num_llis].lli = llis_bus + (num_llis + 1) * |
667 | sizeof(struct pl08x_lli); | |
25c94f7f | 668 | llis_va[num_llis].lli |= bd->lli_bus; |
e8689e63 LW |
669 | |
670 | if (cctl & PL080_CONTROL_SRC_INCR) | |
542361f8 | 671 | bd->srcbus.addr += len; |
e8689e63 | 672 | if (cctl & PL080_CONTROL_DST_INCR) |
542361f8 | 673 | bd->dstbus.addr += len; |
e8689e63 | 674 | |
542361f8 | 675 | BUG_ON(bd->remainder < len); |
cace6585 | 676 | |
542361f8 | 677 | bd->remainder -= len; |
e8689e63 LW |
678 | } |
679 | ||
03af500f VK |
680 | static inline void prep_byte_width_lli(struct pl08x_lli_build_data *bd, |
681 | u32 *cctl, u32 len, int num_llis, size_t *total_bytes) | |
e8689e63 | 682 | { |
03af500f VK |
683 | *cctl = pl08x_cctl_bits(*cctl, 1, 1, len); |
684 | pl08x_fill_lli_for_desc(bd, num_llis, len, *cctl); | |
685 | (*total_bytes) += len; | |
e8689e63 LW |
686 | } |
687 | ||
688 | /* | |
689 | * This fills in the table of LLIs for the transfer descriptor | |
690 | * Note that we assume we never have to change the burst sizes | |
691 | * Return 0 for error | |
692 | */ | |
693 | static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, | |
694 | struct pl08x_txd *txd) | |
695 | { | |
e8689e63 | 696 | struct pl08x_bus_data *mbus, *sbus; |
542361f8 | 697 | struct pl08x_lli_build_data bd; |
e8689e63 | 698 | int num_llis = 0; |
03af500f | 699 | u32 cctl, early_bytes = 0; |
b7f69d9d | 700 | size_t max_bytes_per_lli, total_bytes; |
7cb72ad9 | 701 | struct pl08x_lli *llis_va; |
b7f69d9d | 702 | struct pl08x_sg *dsg; |
e8689e63 | 703 | |
3e27ee84 | 704 | txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT, &txd->llis_bus); |
e8689e63 LW |
705 | if (!txd->llis_va) { |
706 | dev_err(&pl08x->adev->dev, "%s no memory for llis\n", __func__); | |
707 | return 0; | |
708 | } | |
709 | ||
710 | pl08x->pool_ctr++; | |
711 | ||
542361f8 | 712 | bd.txd = txd; |
25c94f7f | 713 | bd.lli_bus = (pl08x->lli_buses & PL08X_AHB2) ? PL080_LLI_LM_AHB2 : 0; |
b7f69d9d | 714 | cctl = txd->cctl; |
542361f8 | 715 | |
e8689e63 | 716 | /* Find maximum width of the source bus */ |
542361f8 | 717 | bd.srcbus.maxwidth = |
e8689e63 LW |
718 | pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_SWIDTH_MASK) >> |
719 | PL080_CONTROL_SWIDTH_SHIFT); | |
720 | ||
721 | /* Find maximum width of the destination bus */ | |
542361f8 | 722 | bd.dstbus.maxwidth = |
e8689e63 LW |
723 | pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_DWIDTH_MASK) >> |
724 | PL080_CONTROL_DWIDTH_SHIFT); | |
725 | ||
b7f69d9d VK |
726 | list_for_each_entry(dsg, &txd->dsg_list, node) { |
727 | total_bytes = 0; | |
728 | cctl = txd->cctl; | |
e8689e63 | 729 | |
b7f69d9d VK |
730 | bd.srcbus.addr = dsg->src_addr; |
731 | bd.dstbus.addr = dsg->dst_addr; | |
732 | bd.remainder = dsg->len; | |
733 | bd.srcbus.buswidth = bd.srcbus.maxwidth; | |
734 | bd.dstbus.buswidth = bd.dstbus.maxwidth; | |
e8689e63 | 735 | |
b7f69d9d | 736 | pl08x_choose_master_bus(&bd, &mbus, &sbus, cctl); |
e8689e63 | 737 | |
b7f69d9d VK |
738 | dev_vdbg(&pl08x->adev->dev, "src=0x%08x%s/%u dst=0x%08x%s/%u len=%zu\n", |
739 | bd.srcbus.addr, cctl & PL080_CONTROL_SRC_INCR ? "+" : "", | |
740 | bd.srcbus.buswidth, | |
741 | bd.dstbus.addr, cctl & PL080_CONTROL_DST_INCR ? "+" : "", | |
742 | bd.dstbus.buswidth, | |
743 | bd.remainder); | |
744 | dev_vdbg(&pl08x->adev->dev, "mbus=%s sbus=%s\n", | |
745 | mbus == &bd.srcbus ? "src" : "dst", | |
746 | sbus == &bd.srcbus ? "src" : "dst"); | |
fc74eb79 | 747 | |
b7f69d9d VK |
748 | /* |
749 | * Zero length is only allowed if all these requirements are | |
750 | * met: | |
751 | * - flow controller is peripheral. | |
752 | * - src.addr is aligned to src.width | |
753 | * - dst.addr is aligned to dst.width | |
754 | * | |
755 | * sg_len == 1 should be true, as there can be two cases here: | |
756 | * | |
757 | * - Memory addresses are contiguous and are not scattered. | |
758 | * Here, Only one sg will be passed by user driver, with | |
759 | * memory address and zero length. We pass this to controller | |
760 | * and after the transfer it will receive the last burst | |
761 | * request from peripheral and so transfer finishes. | |
762 | * | |
763 | * - Memory addresses are scattered and are not contiguous. | |
764 | * Here, Obviously as DMA controller doesn't know when a lli's | |
765 | * transfer gets over, it can't load next lli. So in this | |
766 | * case, there has to be an assumption that only one lli is | |
767 | * supported. Thus, we can't have scattered addresses. | |
768 | */ | |
769 | if (!bd.remainder) { | |
770 | u32 fc = (txd->ccfg & PL080_CONFIG_FLOW_CONTROL_MASK) >> | |
771 | PL080_CONFIG_FLOW_CONTROL_SHIFT; | |
772 | if (!((fc >= PL080_FLOW_SRC2DST_DST) && | |
0a235657 | 773 | (fc <= PL080_FLOW_SRC2DST_SRC))) { |
b7f69d9d VK |
774 | dev_err(&pl08x->adev->dev, "%s sg len can't be zero", |
775 | __func__); | |
776 | return 0; | |
777 | } | |
0a235657 | 778 | |
b7f69d9d | 779 | if ((bd.srcbus.addr % bd.srcbus.buswidth) || |
880db3ff | 780 | (bd.dstbus.addr % bd.dstbus.buswidth)) { |
b7f69d9d VK |
781 | dev_err(&pl08x->adev->dev, |
782 | "%s src & dst address must be aligned to src" | |
783 | " & dst width if peripheral is flow controller", | |
784 | __func__); | |
785 | return 0; | |
786 | } | |
03af500f | 787 | |
b7f69d9d VK |
788 | cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth, |
789 | bd.dstbus.buswidth, 0); | |
790 | pl08x_fill_lli_for_desc(&bd, num_llis++, 0, cctl); | |
791 | break; | |
792 | } | |
e8689e63 LW |
793 | |
794 | /* | |
b7f69d9d VK |
795 | * Send byte by byte for following cases |
796 | * - Less than a bus width available | |
797 | * - until master bus is aligned | |
e8689e63 | 798 | */ |
b7f69d9d VK |
799 | if (bd.remainder < mbus->buswidth) |
800 | early_bytes = bd.remainder; | |
801 | else if ((mbus->addr) % (mbus->buswidth)) { | |
802 | early_bytes = mbus->buswidth - (mbus->addr) % | |
803 | (mbus->buswidth); | |
804 | if ((bd.remainder - early_bytes) < mbus->buswidth) | |
805 | early_bytes = bd.remainder; | |
806 | } | |
e8689e63 | 807 | |
b7f69d9d VK |
808 | if (early_bytes) { |
809 | dev_vdbg(&pl08x->adev->dev, | |
810 | "%s byte width LLIs (remain 0x%08x)\n", | |
811 | __func__, bd.remainder); | |
812 | prep_byte_width_lli(&bd, &cctl, early_bytes, num_llis++, | |
813 | &total_bytes); | |
e8689e63 LW |
814 | } |
815 | ||
b7f69d9d VK |
816 | if (bd.remainder) { |
817 | /* | |
818 | * Master now aligned | |
819 | * - if slave is not then we must set its width down | |
820 | */ | |
821 | if (sbus->addr % sbus->buswidth) { | |
822 | dev_dbg(&pl08x->adev->dev, | |
823 | "%s set down bus width to one byte\n", | |
824 | __func__); | |
fa6a940b | 825 | |
b7f69d9d VK |
826 | sbus->buswidth = 1; |
827 | } | |
e8689e63 LW |
828 | |
829 | /* | |
b7f69d9d VK |
830 | * Bytes transferred = tsize * src width, not |
831 | * MIN(buswidths) | |
e8689e63 | 832 | */ |
b7f69d9d VK |
833 | max_bytes_per_lli = bd.srcbus.buswidth * |
834 | PL080_CONTROL_TRANSFER_SIZE_MASK; | |
835 | dev_vdbg(&pl08x->adev->dev, | |
836 | "%s max bytes per lli = %zu\n", | |
837 | __func__, max_bytes_per_lli); | |
e8689e63 LW |
838 | |
839 | /* | |
b7f69d9d VK |
840 | * Make largest possible LLIs until less than one bus |
841 | * width left | |
e8689e63 | 842 | */ |
b7f69d9d VK |
843 | while (bd.remainder > (mbus->buswidth - 1)) { |
844 | size_t lli_len, tsize, width; | |
e8689e63 | 845 | |
b7f69d9d VK |
846 | /* |
847 | * If enough left try to send max possible, | |
848 | * otherwise try to send the remainder | |
849 | */ | |
850 | lli_len = min(bd.remainder, max_bytes_per_lli); | |
16a2e7d3 | 851 | |
b7f69d9d VK |
852 | /* |
853 | * Check against maximum bus alignment: | |
854 | * Calculate actual transfer size in relation to | |
855 | * bus width an get a maximum remainder of the | |
856 | * highest bus width - 1 | |
857 | */ | |
858 | width = max(mbus->buswidth, sbus->buswidth); | |
859 | lli_len = (lli_len / width) * width; | |
860 | tsize = lli_len / bd.srcbus.buswidth; | |
861 | ||
862 | dev_vdbg(&pl08x->adev->dev, | |
863 | "%s fill lli with single lli chunk of " | |
864 | "size 0x%08zx (remainder 0x%08zx)\n", | |
865 | __func__, lli_len, bd.remainder); | |
866 | ||
867 | cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth, | |
16a2e7d3 | 868 | bd.dstbus.buswidth, tsize); |
b7f69d9d VK |
869 | pl08x_fill_lli_for_desc(&bd, num_llis++, |
870 | lli_len, cctl); | |
871 | total_bytes += lli_len; | |
872 | } | |
e8689e63 | 873 | |
b7f69d9d VK |
874 | /* |
875 | * Send any odd bytes | |
876 | */ | |
877 | if (bd.remainder) { | |
878 | dev_vdbg(&pl08x->adev->dev, | |
879 | "%s align with boundary, send odd bytes (remain %zu)\n", | |
880 | __func__, bd.remainder); | |
881 | prep_byte_width_lli(&bd, &cctl, bd.remainder, | |
882 | num_llis++, &total_bytes); | |
883 | } | |
e8689e63 | 884 | } |
16a2e7d3 | 885 | |
b7f69d9d VK |
886 | if (total_bytes != dsg->len) { |
887 | dev_err(&pl08x->adev->dev, | |
888 | "%s size of encoded lli:s don't match total txd, transferred 0x%08zx from size 0x%08zx\n", | |
889 | __func__, total_bytes, dsg->len); | |
890 | return 0; | |
891 | } | |
e8689e63 | 892 | |
b7f69d9d VK |
893 | if (num_llis >= MAX_NUM_TSFR_LLIS) { |
894 | dev_err(&pl08x->adev->dev, | |
895 | "%s need to increase MAX_NUM_TSFR_LLIS from 0x%08x\n", | |
896 | __func__, (u32) MAX_NUM_TSFR_LLIS); | |
897 | return 0; | |
898 | } | |
e8689e63 | 899 | } |
b58b6b5b RKAL |
900 | |
901 | llis_va = txd->llis_va; | |
94ae8522 | 902 | /* The final LLI terminates the LLI. */ |
bfddfb45 | 903 | llis_va[num_llis - 1].lli = 0; |
94ae8522 | 904 | /* The final LLI element shall also fire an interrupt. */ |
b58b6b5b | 905 | llis_va[num_llis - 1].cctl |= PL080_CONTROL_TC_IRQ_EN; |
e8689e63 | 906 | |
e8689e63 LW |
907 | #ifdef VERBOSE_DEBUG |
908 | { | |
909 | int i; | |
910 | ||
fc74eb79 RKAL |
911 | dev_vdbg(&pl08x->adev->dev, |
912 | "%-3s %-9s %-10s %-10s %-10s %s\n", | |
913 | "lli", "", "csrc", "cdst", "clli", "cctl"); | |
e8689e63 LW |
914 | for (i = 0; i < num_llis; i++) { |
915 | dev_vdbg(&pl08x->adev->dev, | |
fc74eb79 RKAL |
916 | "%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x\n", |
917 | i, &llis_va[i], llis_va[i].src, | |
918 | llis_va[i].dst, llis_va[i].lli, llis_va[i].cctl | |
e8689e63 LW |
919 | ); |
920 | } | |
921 | } | |
922 | #endif | |
923 | ||
924 | return num_llis; | |
925 | } | |
926 | ||
927 | /* You should call this with the struct pl08x lock held */ | |
928 | static void pl08x_free_txd(struct pl08x_driver_data *pl08x, | |
929 | struct pl08x_txd *txd) | |
930 | { | |
b7f69d9d VK |
931 | struct pl08x_sg *dsg, *_dsg; |
932 | ||
e8689e63 | 933 | /* Free the LLI */ |
c1205646 VK |
934 | if (txd->llis_va) |
935 | dma_pool_free(pl08x->pool, txd->llis_va, txd->llis_bus); | |
e8689e63 LW |
936 | |
937 | pl08x->pool_ctr--; | |
938 | ||
b7f69d9d VK |
939 | list_for_each_entry_safe(dsg, _dsg, &txd->dsg_list, node) { |
940 | list_del(&dsg->node); | |
941 | kfree(dsg); | |
942 | } | |
943 | ||
e8689e63 LW |
944 | kfree(txd); |
945 | } | |
946 | ||
947 | static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x, | |
948 | struct pl08x_dma_chan *plchan) | |
949 | { | |
950 | struct pl08x_txd *txdi = NULL; | |
951 | struct pl08x_txd *next; | |
952 | ||
15c17232 | 953 | if (!list_empty(&plchan->pend_list)) { |
e8689e63 | 954 | list_for_each_entry_safe(txdi, |
15c17232 | 955 | next, &plchan->pend_list, node) { |
e8689e63 LW |
956 | list_del(&txdi->node); |
957 | pl08x_free_txd(pl08x, txdi); | |
958 | } | |
e8689e63 LW |
959 | } |
960 | } | |
961 | ||
962 | /* | |
963 | * The DMA ENGINE API | |
964 | */ | |
965 | static int pl08x_alloc_chan_resources(struct dma_chan *chan) | |
966 | { | |
967 | return 0; | |
968 | } | |
969 | ||
970 | static void pl08x_free_chan_resources(struct dma_chan *chan) | |
971 | { | |
972 | } | |
973 | ||
974 | /* | |
975 | * This should be called with the channel plchan->lock held | |
976 | */ | |
977 | static int prep_phy_channel(struct pl08x_dma_chan *plchan, | |
978 | struct pl08x_txd *txd) | |
979 | { | |
980 | struct pl08x_driver_data *pl08x = plchan->host; | |
981 | struct pl08x_phy_chan *ch; | |
982 | int ret; | |
983 | ||
984 | /* Check if we already have a channel */ | |
8f0d30f9 VK |
985 | if (plchan->phychan) { |
986 | ch = plchan->phychan; | |
987 | goto got_channel; | |
988 | } | |
e8689e63 LW |
989 | |
990 | ch = pl08x_get_phy_channel(pl08x, plchan); | |
991 | if (!ch) { | |
992 | /* No physical channel available, cope with it */ | |
993 | dev_dbg(&pl08x->adev->dev, "no physical channel available for xfer on %s\n", plchan->name); | |
994 | return -EBUSY; | |
995 | } | |
996 | ||
997 | /* | |
998 | * OK we have a physical channel: for memcpy() this is all we | |
999 | * need, but for slaves the physical signals may be muxed! | |
1000 | * Can the platform allow us to use this channel? | |
1001 | */ | |
16ca8105 | 1002 | if (plchan->slave && pl08x->pd->get_signal) { |
aeea1808 | 1003 | ret = pl08x->pd->get_signal(plchan->cd); |
e8689e63 LW |
1004 | if (ret < 0) { |
1005 | dev_dbg(&pl08x->adev->dev, | |
1006 | "unable to use physical channel %d for transfer on %s due to platform restrictions\n", | |
1007 | ch->id, plchan->name); | |
1008 | /* Release physical channel & return */ | |
1009 | pl08x_put_phy_channel(pl08x, ch); | |
1010 | return -EBUSY; | |
1011 | } | |
1012 | ch->signal = ret; | |
1013 | } | |
1014 | ||
8f0d30f9 | 1015 | plchan->phychan = ch; |
e8689e63 LW |
1016 | dev_dbg(&pl08x->adev->dev, "allocated physical channel %d and signal %d for xfer on %s\n", |
1017 | ch->id, | |
1018 | ch->signal, | |
1019 | plchan->name); | |
1020 | ||
8f0d30f9 VK |
1021 | got_channel: |
1022 | /* Assign the flow control signal to this channel */ | |
1023 | if (txd->direction == DMA_MEM_TO_DEV) | |
1024 | txd->ccfg |= ch->signal << PL080_CONFIG_DST_SEL_SHIFT; | |
1025 | else if (txd->direction == DMA_DEV_TO_MEM) | |
1026 | txd->ccfg |= ch->signal << PL080_CONFIG_SRC_SEL_SHIFT; | |
1027 | ||
8087aacd | 1028 | plchan->phychan_hold++; |
e8689e63 LW |
1029 | |
1030 | return 0; | |
1031 | } | |
1032 | ||
8c8cc2b1 RKAL |
1033 | static void release_phy_channel(struct pl08x_dma_chan *plchan) |
1034 | { | |
1035 | struct pl08x_driver_data *pl08x = plchan->host; | |
1036 | ||
1037 | if ((plchan->phychan->signal >= 0) && pl08x->pd->put_signal) { | |
aeea1808 | 1038 | pl08x->pd->put_signal(plchan->cd, plchan->phychan->signal); |
8c8cc2b1 RKAL |
1039 | plchan->phychan->signal = -1; |
1040 | } | |
1041 | pl08x_put_phy_channel(pl08x, plchan->phychan); | |
1042 | plchan->phychan = NULL; | |
1043 | } | |
1044 | ||
e8689e63 LW |
1045 | static dma_cookie_t pl08x_tx_submit(struct dma_async_tx_descriptor *tx) |
1046 | { | |
1047 | struct pl08x_dma_chan *plchan = to_pl08x_chan(tx->chan); | |
501e67e8 | 1048 | struct pl08x_txd *txd = to_pl08x_txd(tx); |
c370e594 | 1049 | unsigned long flags; |
884485e1 | 1050 | dma_cookie_t cookie; |
c370e594 RKAL |
1051 | |
1052 | spin_lock_irqsave(&plchan->lock, flags); | |
884485e1 | 1053 | cookie = dma_cookie_assign(tx); |
501e67e8 RKAL |
1054 | |
1055 | /* Put this onto the pending list */ | |
1056 | list_add_tail(&txd->node, &plchan->pend_list); | |
1057 | ||
1058 | /* | |
1059 | * If there was no physical channel available for this memcpy, | |
1060 | * stack the request up and indicate that the channel is waiting | |
1061 | * for a free physical channel. | |
1062 | */ | |
1063 | if (!plchan->slave && !plchan->phychan) { | |
1064 | /* Do this memcpy whenever there is a channel ready */ | |
1065 | plchan->state = PL08X_CHAN_WAITING; | |
1066 | plchan->waiting = txd; | |
8087aacd RKAL |
1067 | } else { |
1068 | plchan->phychan_hold--; | |
501e67e8 RKAL |
1069 | } |
1070 | ||
c370e594 | 1071 | spin_unlock_irqrestore(&plchan->lock, flags); |
e8689e63 | 1072 | |
884485e1 | 1073 | return cookie; |
e8689e63 LW |
1074 | } |
1075 | ||
1076 | static struct dma_async_tx_descriptor *pl08x_prep_dma_interrupt( | |
1077 | struct dma_chan *chan, unsigned long flags) | |
1078 | { | |
1079 | struct dma_async_tx_descriptor *retval = NULL; | |
1080 | ||
1081 | return retval; | |
1082 | } | |
1083 | ||
1084 | /* | |
94ae8522 RKAL |
1085 | * Code accessing dma_async_is_complete() in a tight loop may give problems. |
1086 | * If slaves are relying on interrupts to signal completion this function | |
1087 | * must not be called with interrupts disabled. | |
e8689e63 | 1088 | */ |
3e27ee84 VK |
1089 | static enum dma_status pl08x_dma_tx_status(struct dma_chan *chan, |
1090 | dma_cookie_t cookie, struct dma_tx_state *txstate) | |
e8689e63 LW |
1091 | { |
1092 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
e8689e63 | 1093 | enum dma_status ret; |
e8689e63 | 1094 | |
96a2af41 RKAL |
1095 | ret = dma_cookie_status(chan, cookie, txstate); |
1096 | if (ret == DMA_SUCCESS) | |
e8689e63 | 1097 | return ret; |
e8689e63 | 1098 | |
e8689e63 LW |
1099 | /* |
1100 | * This cookie not complete yet | |
96a2af41 | 1101 | * Get number of bytes left in the active transactions and queue |
e8689e63 | 1102 | */ |
96a2af41 | 1103 | dma_set_residue(txstate, pl08x_getbytes_chan(plchan)); |
e8689e63 LW |
1104 | |
1105 | if (plchan->state == PL08X_CHAN_PAUSED) | |
1106 | return DMA_PAUSED; | |
1107 | ||
1108 | /* Whether waiting or running, we're in progress */ | |
1109 | return DMA_IN_PROGRESS; | |
1110 | } | |
1111 | ||
1112 | /* PrimeCell DMA extension */ | |
1113 | struct burst_table { | |
760596c6 | 1114 | u32 burstwords; |
e8689e63 LW |
1115 | u32 reg; |
1116 | }; | |
1117 | ||
1118 | static const struct burst_table burst_sizes[] = { | |
1119 | { | |
1120 | .burstwords = 256, | |
760596c6 | 1121 | .reg = PL080_BSIZE_256, |
e8689e63 LW |
1122 | }, |
1123 | { | |
1124 | .burstwords = 128, | |
760596c6 | 1125 | .reg = PL080_BSIZE_128, |
e8689e63 LW |
1126 | }, |
1127 | { | |
1128 | .burstwords = 64, | |
760596c6 | 1129 | .reg = PL080_BSIZE_64, |
e8689e63 LW |
1130 | }, |
1131 | { | |
1132 | .burstwords = 32, | |
760596c6 | 1133 | .reg = PL080_BSIZE_32, |
e8689e63 LW |
1134 | }, |
1135 | { | |
1136 | .burstwords = 16, | |
760596c6 | 1137 | .reg = PL080_BSIZE_16, |
e8689e63 LW |
1138 | }, |
1139 | { | |
1140 | .burstwords = 8, | |
760596c6 | 1141 | .reg = PL080_BSIZE_8, |
e8689e63 LW |
1142 | }, |
1143 | { | |
1144 | .burstwords = 4, | |
760596c6 | 1145 | .reg = PL080_BSIZE_4, |
e8689e63 LW |
1146 | }, |
1147 | { | |
760596c6 RKAL |
1148 | .burstwords = 0, |
1149 | .reg = PL080_BSIZE_1, | |
e8689e63 LW |
1150 | }, |
1151 | }; | |
1152 | ||
121c8476 RKAL |
1153 | /* |
1154 | * Given the source and destination available bus masks, select which | |
1155 | * will be routed to each port. We try to have source and destination | |
1156 | * on separate ports, but always respect the allowable settings. | |
1157 | */ | |
1158 | static u32 pl08x_select_bus(u8 src, u8 dst) | |
1159 | { | |
1160 | u32 cctl = 0; | |
1161 | ||
1162 | if (!(dst & PL08X_AHB1) || ((dst & PL08X_AHB2) && (src & PL08X_AHB1))) | |
1163 | cctl |= PL080_CONTROL_DST_AHB2; | |
1164 | if (!(src & PL08X_AHB1) || ((src & PL08X_AHB2) && !(dst & PL08X_AHB2))) | |
1165 | cctl |= PL080_CONTROL_SRC_AHB2; | |
1166 | ||
1167 | return cctl; | |
1168 | } | |
1169 | ||
f14c426c RKAL |
1170 | static u32 pl08x_cctl(u32 cctl) |
1171 | { | |
1172 | cctl &= ~(PL080_CONTROL_SRC_AHB2 | PL080_CONTROL_DST_AHB2 | | |
1173 | PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR | | |
1174 | PL080_CONTROL_PROT_MASK); | |
1175 | ||
1176 | /* Access the cell in privileged mode, non-bufferable, non-cacheable */ | |
1177 | return cctl | PL080_CONTROL_PROT_SYS; | |
1178 | } | |
1179 | ||
aa88cdaa RKAL |
1180 | static u32 pl08x_width(enum dma_slave_buswidth width) |
1181 | { | |
1182 | switch (width) { | |
1183 | case DMA_SLAVE_BUSWIDTH_1_BYTE: | |
1184 | return PL080_WIDTH_8BIT; | |
1185 | case DMA_SLAVE_BUSWIDTH_2_BYTES: | |
1186 | return PL080_WIDTH_16BIT; | |
1187 | case DMA_SLAVE_BUSWIDTH_4_BYTES: | |
1188 | return PL080_WIDTH_32BIT; | |
f32807f1 VK |
1189 | default: |
1190 | return ~0; | |
aa88cdaa | 1191 | } |
aa88cdaa RKAL |
1192 | } |
1193 | ||
760596c6 RKAL |
1194 | static u32 pl08x_burst(u32 maxburst) |
1195 | { | |
1196 | int i; | |
1197 | ||
1198 | for (i = 0; i < ARRAY_SIZE(burst_sizes); i++) | |
1199 | if (burst_sizes[i].burstwords <= maxburst) | |
1200 | break; | |
1201 | ||
1202 | return burst_sizes[i].reg; | |
1203 | } | |
1204 | ||
9862ba17 RK |
1205 | static u32 pl08x_get_cctl(struct pl08x_dma_chan *plchan, |
1206 | enum dma_slave_buswidth addr_width, u32 maxburst) | |
1207 | { | |
1208 | u32 width, burst, cctl = 0; | |
1209 | ||
1210 | width = pl08x_width(addr_width); | |
1211 | if (width == ~0) | |
1212 | return ~0; | |
1213 | ||
1214 | cctl |= width << PL080_CONTROL_SWIDTH_SHIFT; | |
1215 | cctl |= width << PL080_CONTROL_DWIDTH_SHIFT; | |
1216 | ||
1217 | /* | |
1218 | * If this channel will only request single transfers, set this | |
1219 | * down to ONE element. Also select one element if no maxburst | |
1220 | * is specified. | |
1221 | */ | |
1222 | if (plchan->cd->single) | |
1223 | maxburst = 1; | |
1224 | ||
1225 | burst = pl08x_burst(maxburst); | |
1226 | cctl |= burst << PL080_CONTROL_SB_SIZE_SHIFT; | |
1227 | cctl |= burst << PL080_CONTROL_DB_SIZE_SHIFT; | |
1228 | ||
1229 | return pl08x_cctl(cctl); | |
1230 | } | |
1231 | ||
f0fd9446 RKAL |
1232 | static int dma_set_runtime_config(struct dma_chan *chan, |
1233 | struct dma_slave_config *config) | |
e8689e63 LW |
1234 | { |
1235 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
b7f75865 RKAL |
1236 | |
1237 | if (!plchan->slave) | |
1238 | return -EINVAL; | |
e8689e63 | 1239 | |
dc8d5f8d RK |
1240 | /* Reject definitely invalid configurations */ |
1241 | if (config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES || | |
1242 | config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES) | |
f0fd9446 | 1243 | return -EINVAL; |
e8689e63 | 1244 | |
ed91c13d RK |
1245 | plchan->cfg = *config; |
1246 | ||
f0fd9446 | 1247 | return 0; |
e8689e63 LW |
1248 | } |
1249 | ||
1250 | /* | |
1251 | * Slave transactions callback to the slave device to allow | |
1252 | * synchronization of slave DMA signals with the DMAC enable | |
1253 | */ | |
1254 | static void pl08x_issue_pending(struct dma_chan *chan) | |
1255 | { | |
1256 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
e8689e63 LW |
1257 | unsigned long flags; |
1258 | ||
1259 | spin_lock_irqsave(&plchan->lock, flags); | |
9c0bb43b RKAL |
1260 | /* Something is already active, or we're waiting for a channel... */ |
1261 | if (plchan->at || plchan->state == PL08X_CHAN_WAITING) { | |
1262 | spin_unlock_irqrestore(&plchan->lock, flags); | |
e8689e63 | 1263 | return; |
9c0bb43b | 1264 | } |
e8689e63 LW |
1265 | |
1266 | /* Take the first element in the queue and execute it */ | |
15c17232 | 1267 | if (!list_empty(&plchan->pend_list)) { |
e8689e63 LW |
1268 | struct pl08x_txd *next; |
1269 | ||
15c17232 | 1270 | next = list_first_entry(&plchan->pend_list, |
e8689e63 LW |
1271 | struct pl08x_txd, |
1272 | node); | |
1273 | list_del(&next->node); | |
e8689e63 LW |
1274 | plchan->state = PL08X_CHAN_RUNNING; |
1275 | ||
c885bee4 | 1276 | pl08x_start_txd(plchan, next); |
e8689e63 LW |
1277 | } |
1278 | ||
1279 | spin_unlock_irqrestore(&plchan->lock, flags); | |
1280 | } | |
1281 | ||
1282 | static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan, | |
1283 | struct pl08x_txd *txd) | |
1284 | { | |
e8689e63 | 1285 | struct pl08x_driver_data *pl08x = plchan->host; |
c370e594 RKAL |
1286 | unsigned long flags; |
1287 | int num_llis, ret; | |
e8689e63 LW |
1288 | |
1289 | num_llis = pl08x_fill_llis_for_desc(pl08x, txd); | |
dafa7317 | 1290 | if (!num_llis) { |
57001a60 VK |
1291 | spin_lock_irqsave(&plchan->lock, flags); |
1292 | pl08x_free_txd(pl08x, txd); | |
1293 | spin_unlock_irqrestore(&plchan->lock, flags); | |
e8689e63 | 1294 | return -EINVAL; |
dafa7317 | 1295 | } |
e8689e63 | 1296 | |
c370e594 | 1297 | spin_lock_irqsave(&plchan->lock, flags); |
e8689e63 | 1298 | |
e8689e63 LW |
1299 | /* |
1300 | * See if we already have a physical channel allocated, | |
1301 | * else this is the time to try to get one. | |
1302 | */ | |
1303 | ret = prep_phy_channel(plchan, txd); | |
1304 | if (ret) { | |
1305 | /* | |
501e67e8 RKAL |
1306 | * No physical channel was available. |
1307 | * | |
1308 | * memcpy transfers can be sorted out at submission time. | |
1309 | * | |
1310 | * Slave transfers may have been denied due to platform | |
1311 | * channel muxing restrictions. Since there is no guarantee | |
1312 | * that this will ever be resolved, and the signal must be | |
1313 | * acquired AFTER acquiring the physical channel, we will let | |
1314 | * them be NACK:ed with -EBUSY here. The drivers can retry | |
1315 | * the prep() call if they are eager on doing this using DMA. | |
e8689e63 LW |
1316 | */ |
1317 | if (plchan->slave) { | |
1318 | pl08x_free_txd_list(pl08x, plchan); | |
501e67e8 | 1319 | pl08x_free_txd(pl08x, txd); |
c370e594 | 1320 | spin_unlock_irqrestore(&plchan->lock, flags); |
e8689e63 LW |
1321 | return -EBUSY; |
1322 | } | |
e8689e63 LW |
1323 | } else |
1324 | /* | |
94ae8522 RKAL |
1325 | * Else we're all set, paused and ready to roll, status |
1326 | * will switch to PL08X_CHAN_RUNNING when we call | |
1327 | * issue_pending(). If there is something running on the | |
1328 | * channel already we don't change its state. | |
e8689e63 LW |
1329 | */ |
1330 | if (plchan->state == PL08X_CHAN_IDLE) | |
1331 | plchan->state = PL08X_CHAN_PAUSED; | |
1332 | ||
c370e594 | 1333 | spin_unlock_irqrestore(&plchan->lock, flags); |
e8689e63 LW |
1334 | |
1335 | return 0; | |
1336 | } | |
1337 | ||
c0428794 RKAL |
1338 | static struct pl08x_txd *pl08x_get_txd(struct pl08x_dma_chan *plchan, |
1339 | unsigned long flags) | |
ac3cd20d | 1340 | { |
b201c111 | 1341 | struct pl08x_txd *txd = kzalloc(sizeof(*txd), GFP_NOWAIT); |
ac3cd20d RKAL |
1342 | |
1343 | if (txd) { | |
1344 | dma_async_tx_descriptor_init(&txd->tx, &plchan->chan); | |
c0428794 | 1345 | txd->tx.flags = flags; |
ac3cd20d RKAL |
1346 | txd->tx.tx_submit = pl08x_tx_submit; |
1347 | INIT_LIST_HEAD(&txd->node); | |
b7f69d9d | 1348 | INIT_LIST_HEAD(&txd->dsg_list); |
4983a04f RKAL |
1349 | |
1350 | /* Always enable error and terminal interrupts */ | |
1351 | txd->ccfg = PL080_CONFIG_ERR_IRQ_MASK | | |
1352 | PL080_CONFIG_TC_IRQ_MASK; | |
ac3cd20d RKAL |
1353 | } |
1354 | return txd; | |
1355 | } | |
1356 | ||
e8689e63 LW |
1357 | /* |
1358 | * Initialize a descriptor to be used by memcpy submit | |
1359 | */ | |
1360 | static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy( | |
1361 | struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, | |
1362 | size_t len, unsigned long flags) | |
1363 | { | |
1364 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1365 | struct pl08x_driver_data *pl08x = plchan->host; | |
1366 | struct pl08x_txd *txd; | |
b7f69d9d | 1367 | struct pl08x_sg *dsg; |
e8689e63 LW |
1368 | int ret; |
1369 | ||
c0428794 | 1370 | txd = pl08x_get_txd(plchan, flags); |
e8689e63 LW |
1371 | if (!txd) { |
1372 | dev_err(&pl08x->adev->dev, | |
1373 | "%s no memory for descriptor\n", __func__); | |
1374 | return NULL; | |
1375 | } | |
1376 | ||
b7f69d9d VK |
1377 | dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT); |
1378 | if (!dsg) { | |
1379 | pl08x_free_txd(pl08x, txd); | |
1380 | dev_err(&pl08x->adev->dev, "%s no memory for pl080 sg\n", | |
1381 | __func__); | |
1382 | return NULL; | |
1383 | } | |
1384 | list_add_tail(&dsg->node, &txd->dsg_list); | |
1385 | ||
92d2fd61 | 1386 | txd->direction = DMA_MEM_TO_MEM; |
b7f69d9d VK |
1387 | dsg->src_addr = src; |
1388 | dsg->dst_addr = dest; | |
1389 | dsg->len = len; | |
e8689e63 LW |
1390 | |
1391 | /* Set platform data for m2m */ | |
4983a04f | 1392 | txd->ccfg |= PL080_FLOW_MEM2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT; |
dc8d5f8d | 1393 | txd->cctl = pl08x->pd->memcpy_channel.cctl_memcpy & |
c7da9a56 | 1394 | ~(PL080_CONTROL_DST_AHB2 | PL080_CONTROL_SRC_AHB2); |
4983a04f | 1395 | |
e8689e63 | 1396 | /* Both to be incremented or the code will break */ |
70b5ed6b | 1397 | txd->cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR; |
c7da9a56 | 1398 | |
c7da9a56 | 1399 | if (pl08x->vd->dualmaster) |
121c8476 RKAL |
1400 | txd->cctl |= pl08x_select_bus(pl08x->mem_buses, |
1401 | pl08x->mem_buses); | |
e8689e63 | 1402 | |
e8689e63 LW |
1403 | ret = pl08x_prep_channel_resources(plchan, txd); |
1404 | if (ret) | |
1405 | return NULL; | |
e8689e63 LW |
1406 | |
1407 | return &txd->tx; | |
1408 | } | |
1409 | ||
3e2a037c | 1410 | static struct dma_async_tx_descriptor *pl08x_prep_slave_sg( |
e8689e63 | 1411 | struct dma_chan *chan, struct scatterlist *sgl, |
db8196df | 1412 | unsigned int sg_len, enum dma_transfer_direction direction, |
185ecb5f | 1413 | unsigned long flags, void *context) |
e8689e63 LW |
1414 | { |
1415 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1416 | struct pl08x_driver_data *pl08x = plchan->host; | |
1417 | struct pl08x_txd *txd; | |
b7f69d9d VK |
1418 | struct pl08x_sg *dsg; |
1419 | struct scatterlist *sg; | |
dc8d5f8d | 1420 | enum dma_slave_buswidth addr_width; |
b7f69d9d | 1421 | dma_addr_t slave_addr; |
0a235657 | 1422 | int ret, tmp; |
409ec8db | 1423 | u8 src_buses, dst_buses; |
dc8d5f8d | 1424 | u32 maxburst, cctl; |
e8689e63 | 1425 | |
e8689e63 | 1426 | dev_dbg(&pl08x->adev->dev, "%s prepare transaction of %d bytes from %s\n", |
fdaf9c4b | 1427 | __func__, sg_dma_len(sgl), plchan->name); |
e8689e63 | 1428 | |
c0428794 | 1429 | txd = pl08x_get_txd(plchan, flags); |
e8689e63 LW |
1430 | if (!txd) { |
1431 | dev_err(&pl08x->adev->dev, "%s no txd\n", __func__); | |
1432 | return NULL; | |
1433 | } | |
1434 | ||
e8689e63 LW |
1435 | /* |
1436 | * Set up addresses, the PrimeCell configured address | |
1437 | * will take precedence since this may configure the | |
1438 | * channel target address dynamically at runtime. | |
1439 | */ | |
1440 | txd->direction = direction; | |
c7da9a56 | 1441 | |
db8196df | 1442 | if (direction == DMA_MEM_TO_DEV) { |
dc8d5f8d | 1443 | cctl = PL080_CONTROL_SRC_INCR; |
ed91c13d | 1444 | slave_addr = plchan->cfg.dst_addr; |
dc8d5f8d RK |
1445 | addr_width = plchan->cfg.dst_addr_width; |
1446 | maxburst = plchan->cfg.dst_maxburst; | |
409ec8db RK |
1447 | src_buses = pl08x->mem_buses; |
1448 | dst_buses = plchan->cd->periph_buses; | |
db8196df | 1449 | } else if (direction == DMA_DEV_TO_MEM) { |
dc8d5f8d | 1450 | cctl = PL080_CONTROL_DST_INCR; |
ed91c13d | 1451 | slave_addr = plchan->cfg.src_addr; |
dc8d5f8d RK |
1452 | addr_width = plchan->cfg.src_addr_width; |
1453 | maxburst = plchan->cfg.src_maxburst; | |
409ec8db RK |
1454 | src_buses = plchan->cd->periph_buses; |
1455 | dst_buses = pl08x->mem_buses; | |
e8689e63 | 1456 | } else { |
b7f69d9d | 1457 | pl08x_free_txd(pl08x, txd); |
e8689e63 LW |
1458 | dev_err(&pl08x->adev->dev, |
1459 | "%s direction unsupported\n", __func__); | |
1460 | return NULL; | |
1461 | } | |
e8689e63 | 1462 | |
dc8d5f8d | 1463 | cctl |= pl08x_get_cctl(plchan, addr_width, maxburst); |
800d683e RK |
1464 | if (cctl == ~0) { |
1465 | pl08x_free_txd(pl08x, txd); | |
1466 | dev_err(&pl08x->adev->dev, | |
1467 | "DMA slave configuration botched?\n"); | |
1468 | return NULL; | |
1469 | } | |
1470 | ||
409ec8db RK |
1471 | txd->cctl = cctl | pl08x_select_bus(src_buses, dst_buses); |
1472 | ||
95442b22 | 1473 | if (plchan->cfg.device_fc) |
db8196df | 1474 | tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER_PER : |
0a235657 VK |
1475 | PL080_FLOW_PER2MEM_PER; |
1476 | else | |
db8196df | 1477 | tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER : |
0a235657 VK |
1478 | PL080_FLOW_PER2MEM; |
1479 | ||
1480 | txd->ccfg |= tmp << PL080_CONFIG_FLOW_CONTROL_SHIFT; | |
1481 | ||
b7f69d9d VK |
1482 | for_each_sg(sgl, sg, sg_len, tmp) { |
1483 | dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT); | |
1484 | if (!dsg) { | |
1485 | pl08x_free_txd(pl08x, txd); | |
1486 | dev_err(&pl08x->adev->dev, "%s no mem for pl080 sg\n", | |
1487 | __func__); | |
1488 | return NULL; | |
1489 | } | |
1490 | list_add_tail(&dsg->node, &txd->dsg_list); | |
1491 | ||
1492 | dsg->len = sg_dma_len(sg); | |
db8196df | 1493 | if (direction == DMA_MEM_TO_DEV) { |
cbb796cc | 1494 | dsg->src_addr = sg_dma_address(sg); |
b7f69d9d VK |
1495 | dsg->dst_addr = slave_addr; |
1496 | } else { | |
1497 | dsg->src_addr = slave_addr; | |
cbb796cc | 1498 | dsg->dst_addr = sg_dma_address(sg); |
b7f69d9d VK |
1499 | } |
1500 | } | |
1501 | ||
e8689e63 LW |
1502 | ret = pl08x_prep_channel_resources(plchan, txd); |
1503 | if (ret) | |
1504 | return NULL; | |
e8689e63 LW |
1505 | |
1506 | return &txd->tx; | |
1507 | } | |
1508 | ||
1509 | static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, | |
1510 | unsigned long arg) | |
1511 | { | |
1512 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1513 | struct pl08x_driver_data *pl08x = plchan->host; | |
1514 | unsigned long flags; | |
1515 | int ret = 0; | |
1516 | ||
1517 | /* Controls applicable to inactive channels */ | |
1518 | if (cmd == DMA_SLAVE_CONFIG) { | |
f0fd9446 RKAL |
1519 | return dma_set_runtime_config(chan, |
1520 | (struct dma_slave_config *)arg); | |
e8689e63 LW |
1521 | } |
1522 | ||
1523 | /* | |
1524 | * Anything succeeds on channels with no physical allocation and | |
1525 | * no queued transfers. | |
1526 | */ | |
1527 | spin_lock_irqsave(&plchan->lock, flags); | |
1528 | if (!plchan->phychan && !plchan->at) { | |
1529 | spin_unlock_irqrestore(&plchan->lock, flags); | |
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | switch (cmd) { | |
1534 | case DMA_TERMINATE_ALL: | |
1535 | plchan->state = PL08X_CHAN_IDLE; | |
1536 | ||
1537 | if (plchan->phychan) { | |
fb526210 | 1538 | pl08x_terminate_phy_chan(pl08x, plchan->phychan); |
e8689e63 LW |
1539 | |
1540 | /* | |
1541 | * Mark physical channel as free and free any slave | |
1542 | * signal | |
1543 | */ | |
8c8cc2b1 | 1544 | release_phy_channel(plchan); |
88c08a3f | 1545 | plchan->phychan_hold = 0; |
e8689e63 | 1546 | } |
e8689e63 LW |
1547 | /* Dequeue jobs and free LLIs */ |
1548 | if (plchan->at) { | |
1549 | pl08x_free_txd(pl08x, plchan->at); | |
1550 | plchan->at = NULL; | |
1551 | } | |
1552 | /* Dequeue jobs not yet fired as well */ | |
1553 | pl08x_free_txd_list(pl08x, plchan); | |
1554 | break; | |
1555 | case DMA_PAUSE: | |
1556 | pl08x_pause_phy_chan(plchan->phychan); | |
1557 | plchan->state = PL08X_CHAN_PAUSED; | |
1558 | break; | |
1559 | case DMA_RESUME: | |
1560 | pl08x_resume_phy_chan(plchan->phychan); | |
1561 | plchan->state = PL08X_CHAN_RUNNING; | |
1562 | break; | |
1563 | default: | |
1564 | /* Unknown command */ | |
1565 | ret = -ENXIO; | |
1566 | break; | |
1567 | } | |
1568 | ||
1569 | spin_unlock_irqrestore(&plchan->lock, flags); | |
1570 | ||
1571 | return ret; | |
1572 | } | |
1573 | ||
1574 | bool pl08x_filter_id(struct dma_chan *chan, void *chan_id) | |
1575 | { | |
7703eac9 | 1576 | struct pl08x_dma_chan *plchan; |
e8689e63 LW |
1577 | char *name = chan_id; |
1578 | ||
7703eac9 RKAL |
1579 | /* Reject channels for devices not bound to this driver */ |
1580 | if (chan->device->dev->driver != &pl08x_amba_driver.drv) | |
1581 | return false; | |
1582 | ||
1583 | plchan = to_pl08x_chan(chan); | |
1584 | ||
e8689e63 LW |
1585 | /* Check that the channel is not taken! */ |
1586 | if (!strcmp(plchan->name, name)) | |
1587 | return true; | |
1588 | ||
1589 | return false; | |
1590 | } | |
1591 | ||
1592 | /* | |
1593 | * Just check that the device is there and active | |
94ae8522 RKAL |
1594 | * TODO: turn this bit on/off depending on the number of physical channels |
1595 | * actually used, if it is zero... well shut it off. That will save some | |
1596 | * power. Cut the clock at the same time. | |
e8689e63 LW |
1597 | */ |
1598 | static void pl08x_ensure_on(struct pl08x_driver_data *pl08x) | |
1599 | { | |
affa115e LW |
1600 | /* The Nomadik variant does not have the config register */ |
1601 | if (pl08x->vd->nomadik) | |
1602 | return; | |
48a59ef3 | 1603 | writel(PL080_CONFIG_ENABLE, pl08x->base + PL080_CONFIG); |
e8689e63 LW |
1604 | } |
1605 | ||
3d992e1a RKAL |
1606 | static void pl08x_unmap_buffers(struct pl08x_txd *txd) |
1607 | { | |
1608 | struct device *dev = txd->tx.chan->device->dev; | |
b7f69d9d | 1609 | struct pl08x_sg *dsg; |
3d992e1a RKAL |
1610 | |
1611 | if (!(txd->tx.flags & DMA_COMPL_SKIP_SRC_UNMAP)) { | |
1612 | if (txd->tx.flags & DMA_COMPL_SRC_UNMAP_SINGLE) | |
b7f69d9d VK |
1613 | list_for_each_entry(dsg, &txd->dsg_list, node) |
1614 | dma_unmap_single(dev, dsg->src_addr, dsg->len, | |
1615 | DMA_TO_DEVICE); | |
1616 | else { | |
1617 | list_for_each_entry(dsg, &txd->dsg_list, node) | |
1618 | dma_unmap_page(dev, dsg->src_addr, dsg->len, | |
1619 | DMA_TO_DEVICE); | |
1620 | } | |
3d992e1a RKAL |
1621 | } |
1622 | if (!(txd->tx.flags & DMA_COMPL_SKIP_DEST_UNMAP)) { | |
1623 | if (txd->tx.flags & DMA_COMPL_DEST_UNMAP_SINGLE) | |
b7f69d9d VK |
1624 | list_for_each_entry(dsg, &txd->dsg_list, node) |
1625 | dma_unmap_single(dev, dsg->dst_addr, dsg->len, | |
1626 | DMA_FROM_DEVICE); | |
3d992e1a | 1627 | else |
b7f69d9d VK |
1628 | list_for_each_entry(dsg, &txd->dsg_list, node) |
1629 | dma_unmap_page(dev, dsg->dst_addr, dsg->len, | |
1630 | DMA_FROM_DEVICE); | |
3d992e1a RKAL |
1631 | } |
1632 | } | |
1633 | ||
e8689e63 LW |
1634 | static void pl08x_tasklet(unsigned long data) |
1635 | { | |
1636 | struct pl08x_dma_chan *plchan = (struct pl08x_dma_chan *) data; | |
e8689e63 | 1637 | struct pl08x_driver_data *pl08x = plchan->host; |
858c21c0 | 1638 | struct pl08x_txd *txd; |
bf072af4 | 1639 | unsigned long flags; |
e8689e63 | 1640 | |
bf072af4 | 1641 | spin_lock_irqsave(&plchan->lock, flags); |
e8689e63 | 1642 | |
858c21c0 RKAL |
1643 | txd = plchan->at; |
1644 | plchan->at = NULL; | |
e8689e63 | 1645 | |
858c21c0 | 1646 | if (txd) { |
94ae8522 | 1647 | /* Update last completed */ |
f7fbce07 | 1648 | dma_cookie_complete(&txd->tx); |
e8689e63 | 1649 | } |
8087aacd | 1650 | |
94ae8522 | 1651 | /* If a new descriptor is queued, set it up plchan->at is NULL here */ |
15c17232 | 1652 | if (!list_empty(&plchan->pend_list)) { |
e8689e63 LW |
1653 | struct pl08x_txd *next; |
1654 | ||
15c17232 | 1655 | next = list_first_entry(&plchan->pend_list, |
e8689e63 LW |
1656 | struct pl08x_txd, |
1657 | node); | |
1658 | list_del(&next->node); | |
c885bee4 RKAL |
1659 | |
1660 | pl08x_start_txd(plchan, next); | |
8087aacd RKAL |
1661 | } else if (plchan->phychan_hold) { |
1662 | /* | |
1663 | * This channel is still in use - we have a new txd being | |
1664 | * prepared and will soon be queued. Don't give up the | |
1665 | * physical channel. | |
1666 | */ | |
e8689e63 LW |
1667 | } else { |
1668 | struct pl08x_dma_chan *waiting = NULL; | |
1669 | ||
1670 | /* | |
1671 | * No more jobs, so free up the physical channel | |
1672 | * Free any allocated signal on slave transfers too | |
1673 | */ | |
8c8cc2b1 | 1674 | release_phy_channel(plchan); |
e8689e63 LW |
1675 | plchan->state = PL08X_CHAN_IDLE; |
1676 | ||
1677 | /* | |
94ae8522 RKAL |
1678 | * And NOW before anyone else can grab that free:d up |
1679 | * physical channel, see if there is some memcpy pending | |
1680 | * that seriously needs to start because of being stacked | |
1681 | * up while we were choking the physical channels with data. | |
e8689e63 LW |
1682 | */ |
1683 | list_for_each_entry(waiting, &pl08x->memcpy.channels, | |
1684 | chan.device_node) { | |
3e27ee84 VK |
1685 | if (waiting->state == PL08X_CHAN_WAITING && |
1686 | waiting->waiting != NULL) { | |
e8689e63 LW |
1687 | int ret; |
1688 | ||
1689 | /* This should REALLY not fail now */ | |
1690 | ret = prep_phy_channel(waiting, | |
1691 | waiting->waiting); | |
1692 | BUG_ON(ret); | |
8087aacd | 1693 | waiting->phychan_hold--; |
e8689e63 LW |
1694 | waiting->state = PL08X_CHAN_RUNNING; |
1695 | waiting->waiting = NULL; | |
1696 | pl08x_issue_pending(&waiting->chan); | |
1697 | break; | |
1698 | } | |
1699 | } | |
1700 | } | |
1701 | ||
bf072af4 | 1702 | spin_unlock_irqrestore(&plchan->lock, flags); |
858c21c0 | 1703 | |
3d992e1a RKAL |
1704 | if (txd) { |
1705 | dma_async_tx_callback callback = txd->tx.callback; | |
1706 | void *callback_param = txd->tx.callback_param; | |
1707 | ||
1708 | /* Don't try to unmap buffers on slave channels */ | |
1709 | if (!plchan->slave) | |
1710 | pl08x_unmap_buffers(txd); | |
1711 | ||
1712 | /* Free the descriptor */ | |
1713 | spin_lock_irqsave(&plchan->lock, flags); | |
1714 | pl08x_free_txd(pl08x, txd); | |
1715 | spin_unlock_irqrestore(&plchan->lock, flags); | |
1716 | ||
1717 | /* Callback to signal completion */ | |
1718 | if (callback) | |
1719 | callback(callback_param); | |
1720 | } | |
e8689e63 LW |
1721 | } |
1722 | ||
1723 | static irqreturn_t pl08x_irq(int irq, void *dev) | |
1724 | { | |
1725 | struct pl08x_driver_data *pl08x = dev; | |
28da2836 VK |
1726 | u32 mask = 0, err, tc, i; |
1727 | ||
1728 | /* check & clear - ERR & TC interrupts */ | |
1729 | err = readl(pl08x->base + PL080_ERR_STATUS); | |
1730 | if (err) { | |
1731 | dev_err(&pl08x->adev->dev, "%s error interrupt, register value 0x%08x\n", | |
1732 | __func__, err); | |
1733 | writel(err, pl08x->base + PL080_ERR_CLEAR); | |
e8689e63 | 1734 | } |
d29bf019 | 1735 | tc = readl(pl08x->base + PL080_TC_STATUS); |
28da2836 VK |
1736 | if (tc) |
1737 | writel(tc, pl08x->base + PL080_TC_CLEAR); | |
1738 | ||
1739 | if (!err && !tc) | |
1740 | return IRQ_NONE; | |
1741 | ||
e8689e63 | 1742 | for (i = 0; i < pl08x->vd->channels; i++) { |
28da2836 | 1743 | if (((1 << i) & err) || ((1 << i) & tc)) { |
e8689e63 LW |
1744 | /* Locate physical channel */ |
1745 | struct pl08x_phy_chan *phychan = &pl08x->phy_chans[i]; | |
1746 | struct pl08x_dma_chan *plchan = phychan->serving; | |
1747 | ||
28da2836 VK |
1748 | if (!plchan) { |
1749 | dev_err(&pl08x->adev->dev, | |
1750 | "%s Error TC interrupt on unused channel: 0x%08x\n", | |
1751 | __func__, i); | |
1752 | continue; | |
1753 | } | |
1754 | ||
e8689e63 LW |
1755 | /* Schedule tasklet on this channel */ |
1756 | tasklet_schedule(&plchan->tasklet); | |
e8689e63 LW |
1757 | mask |= (1 << i); |
1758 | } | |
1759 | } | |
e8689e63 LW |
1760 | |
1761 | return mask ? IRQ_HANDLED : IRQ_NONE; | |
1762 | } | |
1763 | ||
121c8476 RKAL |
1764 | static void pl08x_dma_slave_init(struct pl08x_dma_chan *chan) |
1765 | { | |
121c8476 RKAL |
1766 | chan->slave = true; |
1767 | chan->name = chan->cd->bus_id; | |
ed91c13d RK |
1768 | chan->cfg.src_addr = chan->cd->addr; |
1769 | chan->cfg.dst_addr = chan->cd->addr; | |
121c8476 RKAL |
1770 | } |
1771 | ||
e8689e63 LW |
1772 | /* |
1773 | * Initialise the DMAC memcpy/slave channels. | |
1774 | * Make a local wrapper to hold required data | |
1775 | */ | |
1776 | static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x, | |
3e27ee84 | 1777 | struct dma_device *dmadev, unsigned int channels, bool slave) |
e8689e63 LW |
1778 | { |
1779 | struct pl08x_dma_chan *chan; | |
1780 | int i; | |
1781 | ||
1782 | INIT_LIST_HEAD(&dmadev->channels); | |
94ae8522 | 1783 | |
e8689e63 LW |
1784 | /* |
1785 | * Register as many many memcpy as we have physical channels, | |
1786 | * we won't always be able to use all but the code will have | |
1787 | * to cope with that situation. | |
1788 | */ | |
1789 | for (i = 0; i < channels; i++) { | |
b201c111 | 1790 | chan = kzalloc(sizeof(*chan), GFP_KERNEL); |
e8689e63 LW |
1791 | if (!chan) { |
1792 | dev_err(&pl08x->adev->dev, | |
1793 | "%s no memory for channel\n", __func__); | |
1794 | return -ENOMEM; | |
1795 | } | |
1796 | ||
1797 | chan->host = pl08x; | |
1798 | chan->state = PL08X_CHAN_IDLE; | |
1799 | ||
1800 | if (slave) { | |
e8689e63 | 1801 | chan->cd = &pl08x->pd->slave_channels[i]; |
121c8476 | 1802 | pl08x_dma_slave_init(chan); |
e8689e63 LW |
1803 | } else { |
1804 | chan->cd = &pl08x->pd->memcpy_channel; | |
1805 | chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i); | |
1806 | if (!chan->name) { | |
1807 | kfree(chan); | |
1808 | return -ENOMEM; | |
1809 | } | |
1810 | } | |
175a5e61 | 1811 | dev_dbg(&pl08x->adev->dev, |
e8689e63 LW |
1812 | "initialize virtual channel \"%s\"\n", |
1813 | chan->name); | |
1814 | ||
1815 | chan->chan.device = dmadev; | |
d3ee98cd | 1816 | dma_cookie_init(&chan->chan); |
e8689e63 LW |
1817 | |
1818 | spin_lock_init(&chan->lock); | |
15c17232 | 1819 | INIT_LIST_HEAD(&chan->pend_list); |
e8689e63 LW |
1820 | tasklet_init(&chan->tasklet, pl08x_tasklet, |
1821 | (unsigned long) chan); | |
1822 | ||
1823 | list_add_tail(&chan->chan.device_node, &dmadev->channels); | |
1824 | } | |
1825 | dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n", | |
1826 | i, slave ? "slave" : "memcpy"); | |
1827 | return i; | |
1828 | } | |
1829 | ||
1830 | static void pl08x_free_virtual_channels(struct dma_device *dmadev) | |
1831 | { | |
1832 | struct pl08x_dma_chan *chan = NULL; | |
1833 | struct pl08x_dma_chan *next; | |
1834 | ||
1835 | list_for_each_entry_safe(chan, | |
1836 | next, &dmadev->channels, chan.device_node) { | |
1837 | list_del(&chan->chan.device_node); | |
1838 | kfree(chan); | |
1839 | } | |
1840 | } | |
1841 | ||
1842 | #ifdef CONFIG_DEBUG_FS | |
1843 | static const char *pl08x_state_str(enum pl08x_dma_chan_state state) | |
1844 | { | |
1845 | switch (state) { | |
1846 | case PL08X_CHAN_IDLE: | |
1847 | return "idle"; | |
1848 | case PL08X_CHAN_RUNNING: | |
1849 | return "running"; | |
1850 | case PL08X_CHAN_PAUSED: | |
1851 | return "paused"; | |
1852 | case PL08X_CHAN_WAITING: | |
1853 | return "waiting"; | |
1854 | default: | |
1855 | break; | |
1856 | } | |
1857 | return "UNKNOWN STATE"; | |
1858 | } | |
1859 | ||
1860 | static int pl08x_debugfs_show(struct seq_file *s, void *data) | |
1861 | { | |
1862 | struct pl08x_driver_data *pl08x = s->private; | |
1863 | struct pl08x_dma_chan *chan; | |
1864 | struct pl08x_phy_chan *ch; | |
1865 | unsigned long flags; | |
1866 | int i; | |
1867 | ||
1868 | seq_printf(s, "PL08x physical channels:\n"); | |
1869 | seq_printf(s, "CHANNEL:\tUSER:\n"); | |
1870 | seq_printf(s, "--------\t-----\n"); | |
1871 | for (i = 0; i < pl08x->vd->channels; i++) { | |
1872 | struct pl08x_dma_chan *virt_chan; | |
1873 | ||
1874 | ch = &pl08x->phy_chans[i]; | |
1875 | ||
1876 | spin_lock_irqsave(&ch->lock, flags); | |
1877 | virt_chan = ch->serving; | |
1878 | ||
affa115e LW |
1879 | seq_printf(s, "%d\t\t%s%s\n", |
1880 | ch->id, | |
1881 | virt_chan ? virt_chan->name : "(none)", | |
1882 | ch->locked ? " LOCKED" : ""); | |
e8689e63 LW |
1883 | |
1884 | spin_unlock_irqrestore(&ch->lock, flags); | |
1885 | } | |
1886 | ||
1887 | seq_printf(s, "\nPL08x virtual memcpy channels:\n"); | |
1888 | seq_printf(s, "CHANNEL:\tSTATE:\n"); | |
1889 | seq_printf(s, "--------\t------\n"); | |
1890 | list_for_each_entry(chan, &pl08x->memcpy.channels, chan.device_node) { | |
3e2a037c | 1891 | seq_printf(s, "%s\t\t%s\n", chan->name, |
e8689e63 LW |
1892 | pl08x_state_str(chan->state)); |
1893 | } | |
1894 | ||
1895 | seq_printf(s, "\nPL08x virtual slave channels:\n"); | |
1896 | seq_printf(s, "CHANNEL:\tSTATE:\n"); | |
1897 | seq_printf(s, "--------\t------\n"); | |
1898 | list_for_each_entry(chan, &pl08x->slave.channels, chan.device_node) { | |
3e2a037c | 1899 | seq_printf(s, "%s\t\t%s\n", chan->name, |
e8689e63 LW |
1900 | pl08x_state_str(chan->state)); |
1901 | } | |
1902 | ||
1903 | return 0; | |
1904 | } | |
1905 | ||
1906 | static int pl08x_debugfs_open(struct inode *inode, struct file *file) | |
1907 | { | |
1908 | return single_open(file, pl08x_debugfs_show, inode->i_private); | |
1909 | } | |
1910 | ||
1911 | static const struct file_operations pl08x_debugfs_operations = { | |
1912 | .open = pl08x_debugfs_open, | |
1913 | .read = seq_read, | |
1914 | .llseek = seq_lseek, | |
1915 | .release = single_release, | |
1916 | }; | |
1917 | ||
1918 | static void init_pl08x_debugfs(struct pl08x_driver_data *pl08x) | |
1919 | { | |
1920 | /* Expose a simple debugfs interface to view all clocks */ | |
3e27ee84 VK |
1921 | (void) debugfs_create_file(dev_name(&pl08x->adev->dev), |
1922 | S_IFREG | S_IRUGO, NULL, pl08x, | |
1923 | &pl08x_debugfs_operations); | |
e8689e63 LW |
1924 | } |
1925 | ||
1926 | #else | |
1927 | static inline void init_pl08x_debugfs(struct pl08x_driver_data *pl08x) | |
1928 | { | |
1929 | } | |
1930 | #endif | |
1931 | ||
aa25afad | 1932 | static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) |
e8689e63 LW |
1933 | { |
1934 | struct pl08x_driver_data *pl08x; | |
f96ca9ec | 1935 | const struct vendor_data *vd = id->data; |
e8689e63 LW |
1936 | int ret = 0; |
1937 | int i; | |
1938 | ||
1939 | ret = amba_request_regions(adev, NULL); | |
1940 | if (ret) | |
1941 | return ret; | |
1942 | ||
1943 | /* Create the driver state holder */ | |
b201c111 | 1944 | pl08x = kzalloc(sizeof(*pl08x), GFP_KERNEL); |
e8689e63 LW |
1945 | if (!pl08x) { |
1946 | ret = -ENOMEM; | |
1947 | goto out_no_pl08x; | |
1948 | } | |
1949 | ||
1950 | /* Initialize memcpy engine */ | |
1951 | dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask); | |
1952 | pl08x->memcpy.dev = &adev->dev; | |
1953 | pl08x->memcpy.device_alloc_chan_resources = pl08x_alloc_chan_resources; | |
1954 | pl08x->memcpy.device_free_chan_resources = pl08x_free_chan_resources; | |
1955 | pl08x->memcpy.device_prep_dma_memcpy = pl08x_prep_dma_memcpy; | |
1956 | pl08x->memcpy.device_prep_dma_interrupt = pl08x_prep_dma_interrupt; | |
1957 | pl08x->memcpy.device_tx_status = pl08x_dma_tx_status; | |
1958 | pl08x->memcpy.device_issue_pending = pl08x_issue_pending; | |
1959 | pl08x->memcpy.device_control = pl08x_control; | |
1960 | ||
1961 | /* Initialize slave engine */ | |
1962 | dma_cap_set(DMA_SLAVE, pl08x->slave.cap_mask); | |
1963 | pl08x->slave.dev = &adev->dev; | |
1964 | pl08x->slave.device_alloc_chan_resources = pl08x_alloc_chan_resources; | |
1965 | pl08x->slave.device_free_chan_resources = pl08x_free_chan_resources; | |
1966 | pl08x->slave.device_prep_dma_interrupt = pl08x_prep_dma_interrupt; | |
1967 | pl08x->slave.device_tx_status = pl08x_dma_tx_status; | |
1968 | pl08x->slave.device_issue_pending = pl08x_issue_pending; | |
1969 | pl08x->slave.device_prep_slave_sg = pl08x_prep_slave_sg; | |
1970 | pl08x->slave.device_control = pl08x_control; | |
1971 | ||
1972 | /* Get the platform data */ | |
1973 | pl08x->pd = dev_get_platdata(&adev->dev); | |
1974 | if (!pl08x->pd) { | |
1975 | dev_err(&adev->dev, "no platform data supplied\n"); | |
1976 | goto out_no_platdata; | |
1977 | } | |
1978 | ||
1979 | /* Assign useful pointers to the driver state */ | |
1980 | pl08x->adev = adev; | |
1981 | pl08x->vd = vd; | |
1982 | ||
30749cb4 RKAL |
1983 | /* By default, AHB1 only. If dualmaster, from platform */ |
1984 | pl08x->lli_buses = PL08X_AHB1; | |
1985 | pl08x->mem_buses = PL08X_AHB1; | |
1986 | if (pl08x->vd->dualmaster) { | |
1987 | pl08x->lli_buses = pl08x->pd->lli_buses; | |
1988 | pl08x->mem_buses = pl08x->pd->mem_buses; | |
1989 | } | |
1990 | ||
e8689e63 LW |
1991 | /* A DMA memory pool for LLIs, align on 1-byte boundary */ |
1992 | pl08x->pool = dma_pool_create(DRIVER_NAME, &pl08x->adev->dev, | |
1993 | PL08X_LLI_TSFR_SIZE, PL08X_ALIGN, 0); | |
1994 | if (!pl08x->pool) { | |
1995 | ret = -ENOMEM; | |
1996 | goto out_no_lli_pool; | |
1997 | } | |
1998 | ||
e8689e63 LW |
1999 | pl08x->base = ioremap(adev->res.start, resource_size(&adev->res)); |
2000 | if (!pl08x->base) { | |
2001 | ret = -ENOMEM; | |
2002 | goto out_no_ioremap; | |
2003 | } | |
2004 | ||
2005 | /* Turn on the PL08x */ | |
2006 | pl08x_ensure_on(pl08x); | |
2007 | ||
94ae8522 | 2008 | /* Attach the interrupt handler */ |
e8689e63 LW |
2009 | writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR); |
2010 | writel(0x000000FF, pl08x->base + PL080_TC_CLEAR); | |
2011 | ||
2012 | ret = request_irq(adev->irq[0], pl08x_irq, IRQF_DISABLED, | |
b05cd8f4 | 2013 | DRIVER_NAME, pl08x); |
e8689e63 LW |
2014 | if (ret) { |
2015 | dev_err(&adev->dev, "%s failed to request interrupt %d\n", | |
2016 | __func__, adev->irq[0]); | |
2017 | goto out_no_irq; | |
2018 | } | |
2019 | ||
2020 | /* Initialize physical channels */ | |
affa115e | 2021 | pl08x->phy_chans = kzalloc((vd->channels * sizeof(*pl08x->phy_chans)), |
e8689e63 LW |
2022 | GFP_KERNEL); |
2023 | if (!pl08x->phy_chans) { | |
2024 | dev_err(&adev->dev, "%s failed to allocate " | |
2025 | "physical channel holders\n", | |
2026 | __func__); | |
2027 | goto out_no_phychans; | |
2028 | } | |
2029 | ||
2030 | for (i = 0; i < vd->channels; i++) { | |
2031 | struct pl08x_phy_chan *ch = &pl08x->phy_chans[i]; | |
2032 | ||
2033 | ch->id = i; | |
2034 | ch->base = pl08x->base + PL080_Cx_BASE(i); | |
2035 | spin_lock_init(&ch->lock); | |
e8689e63 | 2036 | ch->signal = -1; |
affa115e LW |
2037 | |
2038 | /* | |
2039 | * Nomadik variants can have channels that are locked | |
2040 | * down for the secure world only. Lock up these channels | |
2041 | * by perpetually serving a dummy virtual channel. | |
2042 | */ | |
2043 | if (vd->nomadik) { | |
2044 | u32 val; | |
2045 | ||
2046 | val = readl(ch->base + PL080_CH_CONFIG); | |
2047 | if (val & (PL080N_CONFIG_ITPROT | PL080N_CONFIG_SECPROT)) { | |
2048 | dev_info(&adev->dev, "physical channel %d reserved for secure access only\n", i); | |
2049 | ch->locked = true; | |
2050 | } | |
2051 | } | |
2052 | ||
175a5e61 VK |
2053 | dev_dbg(&adev->dev, "physical channel %d is %s\n", |
2054 | i, pl08x_phy_channel_busy(ch) ? "BUSY" : "FREE"); | |
e8689e63 LW |
2055 | } |
2056 | ||
2057 | /* Register as many memcpy channels as there are physical channels */ | |
2058 | ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->memcpy, | |
2059 | pl08x->vd->channels, false); | |
2060 | if (ret <= 0) { | |
2061 | dev_warn(&pl08x->adev->dev, | |
2062 | "%s failed to enumerate memcpy channels - %d\n", | |
2063 | __func__, ret); | |
2064 | goto out_no_memcpy; | |
2065 | } | |
2066 | pl08x->memcpy.chancnt = ret; | |
2067 | ||
2068 | /* Register slave channels */ | |
2069 | ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->slave, | |
3e27ee84 | 2070 | pl08x->pd->num_slave_channels, true); |
e8689e63 LW |
2071 | if (ret <= 0) { |
2072 | dev_warn(&pl08x->adev->dev, | |
2073 | "%s failed to enumerate slave channels - %d\n", | |
2074 | __func__, ret); | |
2075 | goto out_no_slave; | |
2076 | } | |
2077 | pl08x->slave.chancnt = ret; | |
2078 | ||
2079 | ret = dma_async_device_register(&pl08x->memcpy); | |
2080 | if (ret) { | |
2081 | dev_warn(&pl08x->adev->dev, | |
2082 | "%s failed to register memcpy as an async device - %d\n", | |
2083 | __func__, ret); | |
2084 | goto out_no_memcpy_reg; | |
2085 | } | |
2086 | ||
2087 | ret = dma_async_device_register(&pl08x->slave); | |
2088 | if (ret) { | |
2089 | dev_warn(&pl08x->adev->dev, | |
2090 | "%s failed to register slave as an async device - %d\n", | |
2091 | __func__, ret); | |
2092 | goto out_no_slave_reg; | |
2093 | } | |
2094 | ||
2095 | amba_set_drvdata(adev, pl08x); | |
2096 | init_pl08x_debugfs(pl08x); | |
b05cd8f4 RKAL |
2097 | dev_info(&pl08x->adev->dev, "DMA: PL%03x rev%u at 0x%08llx irq %d\n", |
2098 | amba_part(adev), amba_rev(adev), | |
2099 | (unsigned long long)adev->res.start, adev->irq[0]); | |
b7b6018b | 2100 | |
e8689e63 LW |
2101 | return 0; |
2102 | ||
2103 | out_no_slave_reg: | |
2104 | dma_async_device_unregister(&pl08x->memcpy); | |
2105 | out_no_memcpy_reg: | |
2106 | pl08x_free_virtual_channels(&pl08x->slave); | |
2107 | out_no_slave: | |
2108 | pl08x_free_virtual_channels(&pl08x->memcpy); | |
2109 | out_no_memcpy: | |
2110 | kfree(pl08x->phy_chans); | |
2111 | out_no_phychans: | |
2112 | free_irq(adev->irq[0], pl08x); | |
2113 | out_no_irq: | |
2114 | iounmap(pl08x->base); | |
2115 | out_no_ioremap: | |
2116 | dma_pool_destroy(pl08x->pool); | |
2117 | out_no_lli_pool: | |
2118 | out_no_platdata: | |
2119 | kfree(pl08x); | |
2120 | out_no_pl08x: | |
2121 | amba_release_regions(adev); | |
2122 | return ret; | |
2123 | } | |
2124 | ||
2125 | /* PL080 has 8 channels and the PL080 have just 2 */ | |
2126 | static struct vendor_data vendor_pl080 = { | |
e8689e63 LW |
2127 | .channels = 8, |
2128 | .dualmaster = true, | |
2129 | }; | |
2130 | ||
affa115e LW |
2131 | static struct vendor_data vendor_nomadik = { |
2132 | .channels = 8, | |
2133 | .dualmaster = true, | |
2134 | .nomadik = true, | |
2135 | }; | |
2136 | ||
e8689e63 | 2137 | static struct vendor_data vendor_pl081 = { |
e8689e63 LW |
2138 | .channels = 2, |
2139 | .dualmaster = false, | |
2140 | }; | |
2141 | ||
2142 | static struct amba_id pl08x_ids[] = { | |
2143 | /* PL080 */ | |
2144 | { | |
2145 | .id = 0x00041080, | |
2146 | .mask = 0x000fffff, | |
2147 | .data = &vendor_pl080, | |
2148 | }, | |
2149 | /* PL081 */ | |
2150 | { | |
2151 | .id = 0x00041081, | |
2152 | .mask = 0x000fffff, | |
2153 | .data = &vendor_pl081, | |
2154 | }, | |
2155 | /* Nomadik 8815 PL080 variant */ | |
2156 | { | |
affa115e | 2157 | .id = 0x00280080, |
e8689e63 | 2158 | .mask = 0x00ffffff, |
affa115e | 2159 | .data = &vendor_nomadik, |
e8689e63 LW |
2160 | }, |
2161 | { 0, 0 }, | |
2162 | }; | |
2163 | ||
037566df DM |
2164 | MODULE_DEVICE_TABLE(amba, pl08x_ids); |
2165 | ||
e8689e63 LW |
2166 | static struct amba_driver pl08x_amba_driver = { |
2167 | .drv.name = DRIVER_NAME, | |
2168 | .id_table = pl08x_ids, | |
2169 | .probe = pl08x_probe, | |
2170 | }; | |
2171 | ||
2172 | static int __init pl08x_init(void) | |
2173 | { | |
2174 | int retval; | |
2175 | retval = amba_driver_register(&pl08x_amba_driver); | |
2176 | if (retval) | |
2177 | printk(KERN_WARNING DRIVER_NAME | |
e8b5e11d | 2178 | "failed to register as an AMBA device (%d)\n", |
e8689e63 LW |
2179 | retval); |
2180 | return retval; | |
2181 | } | |
2182 | subsys_initcall(pl08x_init); |