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1da177e4 LT |
1 | /* |
2 | * | |
3 | * BRIEF MODULE DESCRIPTION | |
4 | * The Descriptor Based DMA channel manager that first appeared | |
5 | * on the Au1550. I started with dma.c, but I think all that is | |
6 | * left is this initial comment :-) | |
7 | * | |
8 | * Copyright 2004 Embedded Edge, LLC | |
9 | * dan@embeddededge.com | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by the | |
13 | * Free Software Foundation; either version 2 of the License, or (at your | |
14 | * option) any later version. | |
15 | * | |
16 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN | |
19 | * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF | |
22 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
23 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
26 | * | |
27 | * You should have received a copy of the GNU General Public License along | |
28 | * with this program; if not, write to the Free Software Foundation, Inc., | |
29 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
30 | * | |
31 | */ | |
e3ad1c23 | 32 | |
78814465 | 33 | #include <linux/init.h> |
1da177e4 | 34 | #include <linux/kernel.h> |
1da177e4 LT |
35 | #include <linux/slab.h> |
36 | #include <linux/spinlock.h> | |
1da177e4 | 37 | #include <linux/interrupt.h> |
2d32ffa4 | 38 | #include <linux/module.h> |
96d660c4 | 39 | #include <linux/sysdev.h> |
1da177e4 LT |
40 | #include <asm/mach-au1x00/au1000.h> |
41 | #include <asm/mach-au1x00/au1xxx_dbdma.h> | |
e3ad1c23 | 42 | |
1da177e4 LT |
43 | #if defined(CONFIG_SOC_AU1550) || defined(CONFIG_SOC_AU1200) |
44 | ||
45 | /* | |
46 | * The Descriptor Based DMA supports up to 16 channels. | |
47 | * | |
48 | * There are 32 devices defined. We keep an internal structure | |
49 | * of devices using these channels, along with additional | |
50 | * information. | |
51 | * | |
52 | * We allocate the descriptors and allow access to them through various | |
53 | * functions. The drivers allocate the data buffers and assign them | |
54 | * to the descriptors. | |
55 | */ | |
2f69ddcc | 56 | static DEFINE_SPINLOCK(au1xxx_dbdma_spin_lock); |
1da177e4 | 57 | |
c1dcb14e | 58 | /* I couldn't find a macro that did this... */ |
1da177e4 LT |
59 | #define ALIGN_ADDR(x, a) ((((u32)(x)) + (a-1)) & ~(a-1)) |
60 | ||
e3ad1c23 | 61 | static dbdma_global_t *dbdma_gptr = (dbdma_global_t *)DDMA_GLOBAL_BASE; |
c1dcb14e | 62 | static int dbdma_initialized; |
1da177e4 | 63 | |
1da177e4 LT |
64 | static dbdev_tab_t dbdev_tab[] = { |
65 | #ifdef CONFIG_SOC_AU1550 | |
66 | /* UARTS */ | |
67 | { DSCR_CMD0_UART0_TX, DEV_FLAGS_OUT, 0, 8, 0x11100004, 0, 0 }, | |
68 | { DSCR_CMD0_UART0_RX, DEV_FLAGS_IN, 0, 8, 0x11100000, 0, 0 }, | |
69 | { DSCR_CMD0_UART3_TX, DEV_FLAGS_OUT, 0, 8, 0x11400004, 0, 0 }, | |
70 | { DSCR_CMD0_UART3_RX, DEV_FLAGS_IN, 0, 8, 0x11400000, 0, 0 }, | |
71 | ||
72 | /* EXT DMA */ | |
73 | { DSCR_CMD0_DMA_REQ0, 0, 0, 0, 0x00000000, 0, 0 }, | |
74 | { DSCR_CMD0_DMA_REQ1, 0, 0, 0, 0x00000000, 0, 0 }, | |
75 | { DSCR_CMD0_DMA_REQ2, 0, 0, 0, 0x00000000, 0, 0 }, | |
76 | { DSCR_CMD0_DMA_REQ3, 0, 0, 0, 0x00000000, 0, 0 }, | |
77 | ||
78 | /* USB DEV */ | |
79 | { DSCR_CMD0_USBDEV_RX0, DEV_FLAGS_IN, 4, 8, 0x10200000, 0, 0 }, | |
80 | { DSCR_CMD0_USBDEV_TX0, DEV_FLAGS_OUT, 4, 8, 0x10200004, 0, 0 }, | |
81 | { DSCR_CMD0_USBDEV_TX1, DEV_FLAGS_OUT, 4, 8, 0x10200008, 0, 0 }, | |
82 | { DSCR_CMD0_USBDEV_TX2, DEV_FLAGS_OUT, 4, 8, 0x1020000c, 0, 0 }, | |
83 | { DSCR_CMD0_USBDEV_RX3, DEV_FLAGS_IN, 4, 8, 0x10200010, 0, 0 }, | |
84 | { DSCR_CMD0_USBDEV_RX4, DEV_FLAGS_IN, 4, 8, 0x10200014, 0, 0 }, | |
85 | ||
86 | /* PSC 0 */ | |
87 | { DSCR_CMD0_PSC0_TX, DEV_FLAGS_OUT, 0, 0, 0x11a0001c, 0, 0 }, | |
88 | { DSCR_CMD0_PSC0_RX, DEV_FLAGS_IN, 0, 0, 0x11a0001c, 0, 0 }, | |
89 | ||
90 | /* PSC 1 */ | |
91 | { DSCR_CMD0_PSC1_TX, DEV_FLAGS_OUT, 0, 0, 0x11b0001c, 0, 0 }, | |
92 | { DSCR_CMD0_PSC1_RX, DEV_FLAGS_IN, 0, 0, 0x11b0001c, 0, 0 }, | |
93 | ||
94 | /* PSC 2 */ | |
95 | { DSCR_CMD0_PSC2_TX, DEV_FLAGS_OUT, 0, 0, 0x10a0001c, 0, 0 }, | |
96 | { DSCR_CMD0_PSC2_RX, DEV_FLAGS_IN, 0, 0, 0x10a0001c, 0, 0 }, | |
97 | ||
98 | /* PSC 3 */ | |
99 | { DSCR_CMD0_PSC3_TX, DEV_FLAGS_OUT, 0, 0, 0x10b0001c, 0, 0 }, | |
100 | { DSCR_CMD0_PSC3_RX, DEV_FLAGS_IN, 0, 0, 0x10b0001c, 0, 0 }, | |
101 | ||
102 | { DSCR_CMD0_PCI_WRITE, 0, 0, 0, 0x00000000, 0, 0 }, /* PCI */ | |
103 | { DSCR_CMD0_NAND_FLASH, 0, 0, 0, 0x00000000, 0, 0 }, /* NAND */ | |
104 | ||
105 | /* MAC 0 */ | |
106 | { DSCR_CMD0_MAC0_RX, DEV_FLAGS_IN, 0, 0, 0x00000000, 0, 0 }, | |
107 | { DSCR_CMD0_MAC0_TX, DEV_FLAGS_OUT, 0, 0, 0x00000000, 0, 0 }, | |
108 | ||
109 | /* MAC 1 */ | |
110 | { DSCR_CMD0_MAC1_RX, DEV_FLAGS_IN, 0, 0, 0x00000000, 0, 0 }, | |
111 | { DSCR_CMD0_MAC1_TX, DEV_FLAGS_OUT, 0, 0, 0x00000000, 0, 0 }, | |
112 | ||
113 | #endif /* CONFIG_SOC_AU1550 */ | |
114 | ||
115 | #ifdef CONFIG_SOC_AU1200 | |
116 | { DSCR_CMD0_UART0_TX, DEV_FLAGS_OUT, 0, 8, 0x11100004, 0, 0 }, | |
117 | { DSCR_CMD0_UART0_RX, DEV_FLAGS_IN, 0, 8, 0x11100000, 0, 0 }, | |
118 | { DSCR_CMD0_UART1_TX, DEV_FLAGS_OUT, 0, 8, 0x11200004, 0, 0 }, | |
119 | { DSCR_CMD0_UART1_RX, DEV_FLAGS_IN, 0, 8, 0x11200000, 0, 0 }, | |
120 | ||
121 | { DSCR_CMD0_DMA_REQ0, 0, 0, 0, 0x00000000, 0, 0 }, | |
122 | { DSCR_CMD0_DMA_REQ1, 0, 0, 0, 0x00000000, 0, 0 }, | |
123 | ||
124 | { DSCR_CMD0_MAE_BE, DEV_FLAGS_ANYUSE, 0, 0, 0x00000000, 0, 0 }, | |
125 | { DSCR_CMD0_MAE_FE, DEV_FLAGS_ANYUSE, 0, 0, 0x00000000, 0, 0 }, | |
126 | { DSCR_CMD0_MAE_BOTH, DEV_FLAGS_ANYUSE, 0, 0, 0x00000000, 0, 0 }, | |
127 | { DSCR_CMD0_LCD, DEV_FLAGS_ANYUSE, 0, 0, 0x00000000, 0, 0 }, | |
128 | ||
e3ad1c23 PP |
129 | { DSCR_CMD0_SDMS_TX0, DEV_FLAGS_OUT, 4, 8, 0x10600000, 0, 0 }, |
130 | { DSCR_CMD0_SDMS_RX0, DEV_FLAGS_IN, 4, 8, 0x10600004, 0, 0 }, | |
131 | { DSCR_CMD0_SDMS_TX1, DEV_FLAGS_OUT, 4, 8, 0x10680000, 0, 0 }, | |
132 | { DSCR_CMD0_SDMS_RX1, DEV_FLAGS_IN, 4, 8, 0x10680004, 0, 0 }, | |
1da177e4 | 133 | |
e3ad1c23 PP |
134 | { DSCR_CMD0_AES_RX, DEV_FLAGS_IN , 4, 32, 0x10300008, 0, 0 }, |
135 | { DSCR_CMD0_AES_TX, DEV_FLAGS_OUT, 4, 32, 0x10300004, 0, 0 }, | |
1da177e4 | 136 | |
13bb199f PP |
137 | { DSCR_CMD0_PSC0_TX, DEV_FLAGS_OUT, 0, 16, 0x11a0001c, 0, 0 }, |
138 | { DSCR_CMD0_PSC0_RX, DEV_FLAGS_IN, 0, 16, 0x11a0001c, 0, 0 }, | |
1da177e4 LT |
139 | { DSCR_CMD0_PSC0_SYNC, DEV_FLAGS_ANYUSE, 0, 0, 0x00000000, 0, 0 }, |
140 | ||
13bb199f PP |
141 | { DSCR_CMD0_PSC1_TX, DEV_FLAGS_OUT, 0, 16, 0x11b0001c, 0, 0 }, |
142 | { DSCR_CMD0_PSC1_RX, DEV_FLAGS_IN, 0, 16, 0x11b0001c, 0, 0 }, | |
1da177e4 LT |
143 | { DSCR_CMD0_PSC1_SYNC, DEV_FLAGS_ANYUSE, 0, 0, 0x00000000, 0, 0 }, |
144 | ||
e3ad1c23 PP |
145 | { DSCR_CMD0_CIM_RXA, DEV_FLAGS_IN, 0, 32, 0x14004020, 0, 0 }, |
146 | { DSCR_CMD0_CIM_RXB, DEV_FLAGS_IN, 0, 32, 0x14004040, 0, 0 }, | |
147 | { DSCR_CMD0_CIM_RXC, DEV_FLAGS_IN, 0, 32, 0x14004060, 0, 0 }, | |
1da177e4 LT |
148 | { DSCR_CMD0_CIM_SYNC, DEV_FLAGS_ANYUSE, 0, 0, 0x00000000, 0, 0 }, |
149 | ||
150 | { DSCR_CMD0_NAND_FLASH, DEV_FLAGS_IN, 0, 0, 0x00000000, 0, 0 }, | |
151 | ||
c1dcb14e | 152 | #endif /* CONFIG_SOC_AU1200 */ |
1da177e4 LT |
153 | |
154 | { DSCR_CMD0_THROTTLE, DEV_FLAGS_ANYUSE, 0, 0, 0x00000000, 0, 0 }, | |
155 | { DSCR_CMD0_ALWAYS, DEV_FLAGS_ANYUSE, 0, 0, 0x00000000, 0, 0 }, | |
e3ad1c23 PP |
156 | |
157 | /* Provide 16 user definable device types */ | |
0ec734c2 WO |
158 | { ~0, 0, 0, 0, 0, 0, 0 }, |
159 | { ~0, 0, 0, 0, 0, 0, 0 }, | |
160 | { ~0, 0, 0, 0, 0, 0, 0 }, | |
161 | { ~0, 0, 0, 0, 0, 0, 0 }, | |
162 | { ~0, 0, 0, 0, 0, 0, 0 }, | |
163 | { ~0, 0, 0, 0, 0, 0, 0 }, | |
164 | { ~0, 0, 0, 0, 0, 0, 0 }, | |
165 | { ~0, 0, 0, 0, 0, 0, 0 }, | |
166 | { ~0, 0, 0, 0, 0, 0, 0 }, | |
167 | { ~0, 0, 0, 0, 0, 0, 0 }, | |
168 | { ~0, 0, 0, 0, 0, 0, 0 }, | |
169 | { ~0, 0, 0, 0, 0, 0, 0 }, | |
170 | { ~0, 0, 0, 0, 0, 0, 0 }, | |
171 | { ~0, 0, 0, 0, 0, 0, 0 }, | |
172 | { ~0, 0, 0, 0, 0, 0, 0 }, | |
173 | { ~0, 0, 0, 0, 0, 0, 0 }, | |
1da177e4 LT |
174 | }; |
175 | ||
2b22c034 | 176 | #define DBDEV_TAB_SIZE ARRAY_SIZE(dbdev_tab) |
1da177e4 | 177 | |
ac15dad0 | 178 | |
1da177e4 LT |
179 | static chan_tab_t *chan_tab_ptr[NUM_DBDMA_CHANS]; |
180 | ||
c1dcb14e | 181 | static dbdev_tab_t *find_dbdev_id(u32 id) |
1da177e4 LT |
182 | { |
183 | int i; | |
184 | dbdev_tab_t *p; | |
185 | for (i = 0; i < DBDEV_TAB_SIZE; ++i) { | |
186 | p = &dbdev_tab[i]; | |
187 | if (p->dev_id == id) | |
188 | return p; | |
189 | } | |
190 | return NULL; | |
191 | } | |
192 | ||
c1dcb14e | 193 | void *au1xxx_ddma_get_nextptr_virt(au1x_ddma_desc_t *dp) |
26a940e2 | 194 | { |
c1dcb14e | 195 | return phys_to_virt(DSCR_GET_NXTPTR(dp->dscr_nxtptr)); |
26a940e2 PP |
196 | } |
197 | EXPORT_SYMBOL(au1xxx_ddma_get_nextptr_virt); | |
198 | ||
c1dcb14e | 199 | u32 au1xxx_ddma_add_device(dbdev_tab_t *dev) |
e3ad1c23 PP |
200 | { |
201 | u32 ret = 0; | |
c1dcb14e SS |
202 | dbdev_tab_t *p; |
203 | static u16 new_id = 0x1000; | |
e3ad1c23 | 204 | |
0ec734c2 | 205 | p = find_dbdev_id(~0); |
c1dcb14e | 206 | if (NULL != p) { |
e3ad1c23 | 207 | memcpy(p, dev, sizeof(dbdev_tab_t)); |
21a151d8 | 208 | p->dev_id = DSCR_DEV2CUSTOM_ID(new_id, dev->dev_id); |
e3ad1c23 PP |
209 | ret = p->dev_id; |
210 | new_id++; | |
211 | #if 0 | |
c1dcb14e SS |
212 | printk(KERN_DEBUG "add_device: id:%x flags:%x padd:%x\n", |
213 | p->dev_id, p->dev_flags, p->dev_physaddr); | |
e3ad1c23 PP |
214 | #endif |
215 | } | |
216 | ||
217 | return ret; | |
218 | } | |
219 | EXPORT_SYMBOL(au1xxx_ddma_add_device); | |
220 | ||
ccdb0034 ML |
221 | void au1xxx_ddma_del_device(u32 devid) |
222 | { | |
223 | dbdev_tab_t *p = find_dbdev_id(devid); | |
224 | ||
225 | if (p != NULL) { | |
226 | memset(p, 0, sizeof(dbdev_tab_t)); | |
227 | p->dev_id = ~0; | |
228 | } | |
229 | } | |
230 | EXPORT_SYMBOL(au1xxx_ddma_del_device); | |
231 | ||
c1dcb14e SS |
232 | /* Allocate a channel and return a non-zero descriptor if successful. */ |
233 | u32 au1xxx_dbdma_chan_alloc(u32 srcid, u32 destid, | |
53e62d3a | 234 | void (*callback)(int, void *), void *callparam) |
1da177e4 LT |
235 | { |
236 | unsigned long flags; | |
da4afffc | 237 | u32 used, chan; |
1da177e4 LT |
238 | u32 dcp; |
239 | int i; | |
240 | dbdev_tab_t *stp, *dtp; | |
241 | chan_tab_t *ctp; | |
e3ad1c23 | 242 | au1x_dma_chan_t *cp; |
1da177e4 | 243 | |
c1dcb14e SS |
244 | /* |
245 | * We do the intialization on the first channel allocation. | |
1da177e4 LT |
246 | * We have to wait because of the interrupt handler initialization |
247 | * which can't be done successfully during board set up. | |
248 | */ | |
249 | if (!dbdma_initialized) | |
78814465 | 250 | return 0; |
1da177e4 | 251 | |
c1dcb14e SS |
252 | stp = find_dbdev_id(srcid); |
253 | if (stp == NULL) | |
53e62d3a | 254 | return 0; |
c1dcb14e SS |
255 | dtp = find_dbdev_id(destid); |
256 | if (dtp == NULL) | |
53e62d3a | 257 | return 0; |
1da177e4 LT |
258 | |
259 | used = 0; | |
1da177e4 | 260 | |
c1dcb14e | 261 | /* Check to see if we can get both channels. */ |
1da177e4 LT |
262 | spin_lock_irqsave(&au1xxx_dbdma_spin_lock, flags); |
263 | if (!(stp->dev_flags & DEV_FLAGS_INUSE) || | |
264 | (stp->dev_flags & DEV_FLAGS_ANYUSE)) { | |
a3dddd56 | 265 | /* Got source */ |
1da177e4 LT |
266 | stp->dev_flags |= DEV_FLAGS_INUSE; |
267 | if (!(dtp->dev_flags & DEV_FLAGS_INUSE) || | |
268 | (dtp->dev_flags & DEV_FLAGS_ANYUSE)) { | |
269 | /* Got destination */ | |
270 | dtp->dev_flags |= DEV_FLAGS_INUSE; | |
c1dcb14e SS |
271 | } else { |
272 | /* Can't get dest. Release src. */ | |
1da177e4 LT |
273 | stp->dev_flags &= ~DEV_FLAGS_INUSE; |
274 | used++; | |
275 | } | |
c1dcb14e | 276 | } else |
1da177e4 | 277 | used++; |
1da177e4 LT |
278 | spin_unlock_irqrestore(&au1xxx_dbdma_spin_lock, flags); |
279 | ||
da4afffc RB |
280 | if (used) |
281 | return 0; | |
282 | ||
283 | /* Let's see if we can allocate a channel for it. */ | |
284 | ctp = NULL; | |
285 | chan = 0; | |
286 | spin_lock_irqsave(&au1xxx_dbdma_spin_lock, flags); | |
287 | for (i = 0; i < NUM_DBDMA_CHANS; i++) | |
288 | if (chan_tab_ptr[i] == NULL) { | |
289 | /* | |
290 | * If kmalloc fails, it is caught below same | |
291 | * as a channel not available. | |
1da177e4 | 292 | */ |
da4afffc RB |
293 | ctp = kmalloc(sizeof(chan_tab_t), GFP_ATOMIC); |
294 | chan_tab_ptr[i] = ctp; | |
295 | break; | |
1da177e4 | 296 | } |
da4afffc RB |
297 | spin_unlock_irqrestore(&au1xxx_dbdma_spin_lock, flags); |
298 | ||
299 | if (ctp != NULL) { | |
300 | memset(ctp, 0, sizeof(chan_tab_t)); | |
301 | ctp->chan_index = chan = i; | |
302 | dcp = DDMA_CHANNEL_BASE; | |
303 | dcp += (0x0100 * chan); | |
304 | ctp->chan_ptr = (au1x_dma_chan_t *)dcp; | |
305 | cp = (au1x_dma_chan_t *)dcp; | |
306 | ctp->chan_src = stp; | |
307 | ctp->chan_dest = dtp; | |
308 | ctp->chan_callback = callback; | |
309 | ctp->chan_callparam = callparam; | |
310 | ||
311 | /* Initialize channel configuration. */ | |
312 | i = 0; | |
313 | if (stp->dev_intlevel) | |
314 | i |= DDMA_CFG_SED; | |
315 | if (stp->dev_intpolarity) | |
316 | i |= DDMA_CFG_SP; | |
317 | if (dtp->dev_intlevel) | |
318 | i |= DDMA_CFG_DED; | |
319 | if (dtp->dev_intpolarity) | |
320 | i |= DDMA_CFG_DP; | |
321 | if ((stp->dev_flags & DEV_FLAGS_SYNC) || | |
322 | (dtp->dev_flags & DEV_FLAGS_SYNC)) | |
323 | i |= DDMA_CFG_SYNC; | |
324 | cp->ddma_cfg = i; | |
325 | au_sync(); | |
326 | ||
327 | /* | |
328 | * Return a non-zero value that can be used to find the channel | |
329 | * information in subsequent operations. | |
330 | */ | |
331 | return (u32)(&chan_tab_ptr[chan]); | |
1da177e4 | 332 | } |
da4afffc RB |
333 | |
334 | /* Release devices */ | |
335 | stp->dev_flags &= ~DEV_FLAGS_INUSE; | |
336 | dtp->dev_flags &= ~DEV_FLAGS_INUSE; | |
337 | ||
338 | return 0; | |
1da177e4 | 339 | } |
e3ad1c23 | 340 | EXPORT_SYMBOL(au1xxx_dbdma_chan_alloc); |
1da177e4 | 341 | |
c1dcb14e SS |
342 | /* |
343 | * Set the device width if source or destination is a FIFO. | |
1da177e4 LT |
344 | * Should be 8, 16, or 32 bits. |
345 | */ | |
c1dcb14e | 346 | u32 au1xxx_dbdma_set_devwidth(u32 chanid, int bits) |
1da177e4 LT |
347 | { |
348 | u32 rv; | |
349 | chan_tab_t *ctp; | |
350 | dbdev_tab_t *stp, *dtp; | |
351 | ||
352 | ctp = *((chan_tab_t **)chanid); | |
353 | stp = ctp->chan_src; | |
354 | dtp = ctp->chan_dest; | |
355 | rv = 0; | |
356 | ||
357 | if (stp->dev_flags & DEV_FLAGS_IN) { /* Source in fifo */ | |
358 | rv = stp->dev_devwidth; | |
359 | stp->dev_devwidth = bits; | |
360 | } | |
361 | if (dtp->dev_flags & DEV_FLAGS_OUT) { /* Destination out fifo */ | |
362 | rv = dtp->dev_devwidth; | |
363 | dtp->dev_devwidth = bits; | |
364 | } | |
365 | ||
366 | return rv; | |
367 | } | |
e3ad1c23 | 368 | EXPORT_SYMBOL(au1xxx_dbdma_set_devwidth); |
1da177e4 | 369 | |
c1dcb14e SS |
370 | /* Allocate a descriptor ring, initializing as much as possible. */ |
371 | u32 au1xxx_dbdma_ring_alloc(u32 chanid, int entries) | |
1da177e4 LT |
372 | { |
373 | int i; | |
374 | u32 desc_base, srcid, destid; | |
375 | u32 cmd0, cmd1, src1, dest1; | |
376 | u32 src0, dest0; | |
377 | chan_tab_t *ctp; | |
378 | dbdev_tab_t *stp, *dtp; | |
379 | au1x_ddma_desc_t *dp; | |
380 | ||
c1dcb14e SS |
381 | /* |
382 | * I guess we could check this to be within the | |
1da177e4 LT |
383 | * range of the table...... |
384 | */ | |
385 | ctp = *((chan_tab_t **)chanid); | |
386 | stp = ctp->chan_src; | |
387 | dtp = ctp->chan_dest; | |
388 | ||
c1dcb14e SS |
389 | /* |
390 | * The descriptors must be 32-byte aligned. There is a | |
1da177e4 LT |
391 | * possibility the allocation will give us such an address, |
392 | * and if we try that first we are likely to not waste larger | |
393 | * slabs of memory. | |
394 | */ | |
e3ad1c23 | 395 | desc_base = (u32)kmalloc(entries * sizeof(au1x_ddma_desc_t), |
c1dcb14e | 396 | GFP_KERNEL|GFP_DMA); |
1da177e4 LT |
397 | if (desc_base == 0) |
398 | return 0; | |
399 | ||
400 | if (desc_base & 0x1f) { | |
c1dcb14e SS |
401 | /* |
402 | * Lost....do it again, allocate extra, and round | |
1da177e4 LT |
403 | * the address base. |
404 | */ | |
405 | kfree((const void *)desc_base); | |
406 | i = entries * sizeof(au1x_ddma_desc_t); | |
407 | i += (sizeof(au1x_ddma_desc_t) - 1); | |
c1dcb14e SS |
408 | desc_base = (u32)kmalloc(i, GFP_KERNEL|GFP_DMA); |
409 | if (desc_base == 0) | |
1da177e4 LT |
410 | return 0; |
411 | ||
22f4bb68 | 412 | ctp->cdb_membase = desc_base; |
1da177e4 | 413 | desc_base = ALIGN_ADDR(desc_base, sizeof(au1x_ddma_desc_t)); |
22f4bb68 ML |
414 | } else |
415 | ctp->cdb_membase = desc_base; | |
416 | ||
1da177e4 LT |
417 | dp = (au1x_ddma_desc_t *)desc_base; |
418 | ||
c1dcb14e | 419 | /* Keep track of the base descriptor. */ |
1da177e4 LT |
420 | ctp->chan_desc_base = dp; |
421 | ||
c1dcb14e | 422 | /* Initialize the rings with as much information as we know. */ |
1da177e4 LT |
423 | srcid = stp->dev_id; |
424 | destid = dtp->dev_id; | |
425 | ||
426 | cmd0 = cmd1 = src1 = dest1 = 0; | |
427 | src0 = dest0 = 0; | |
428 | ||
429 | cmd0 |= DSCR_CMD0_SID(srcid); | |
430 | cmd0 |= DSCR_CMD0_DID(destid); | |
431 | cmd0 |= DSCR_CMD0_IE | DSCR_CMD0_CV; | |
13bb199f PP |
432 | cmd0 |= DSCR_CMD0_ST(DSCR_CMD0_ST_NOCHANGE); |
433 | ||
c1dcb14e SS |
434 | /* Is it mem to mem transfer? */ |
435 | if (((DSCR_CUSTOM2DEV_ID(srcid) == DSCR_CMD0_THROTTLE) || | |
436 | (DSCR_CUSTOM2DEV_ID(srcid) == DSCR_CMD0_ALWAYS)) && | |
437 | ((DSCR_CUSTOM2DEV_ID(destid) == DSCR_CMD0_THROTTLE) || | |
438 | (DSCR_CUSTOM2DEV_ID(destid) == DSCR_CMD0_ALWAYS))) | |
439 | cmd0 |= DSCR_CMD0_MEM; | |
1da177e4 LT |
440 | |
441 | switch (stp->dev_devwidth) { | |
442 | case 8: | |
443 | cmd0 |= DSCR_CMD0_SW(DSCR_CMD0_BYTE); | |
444 | break; | |
445 | case 16: | |
446 | cmd0 |= DSCR_CMD0_SW(DSCR_CMD0_HALFWORD); | |
447 | break; | |
448 | case 32: | |
449 | default: | |
450 | cmd0 |= DSCR_CMD0_SW(DSCR_CMD0_WORD); | |
451 | break; | |
452 | } | |
453 | ||
454 | switch (dtp->dev_devwidth) { | |
455 | case 8: | |
456 | cmd0 |= DSCR_CMD0_DW(DSCR_CMD0_BYTE); | |
457 | break; | |
458 | case 16: | |
459 | cmd0 |= DSCR_CMD0_DW(DSCR_CMD0_HALFWORD); | |
460 | break; | |
461 | case 32: | |
462 | default: | |
463 | cmd0 |= DSCR_CMD0_DW(DSCR_CMD0_WORD); | |
464 | break; | |
465 | } | |
466 | ||
c1dcb14e SS |
467 | /* |
468 | * If the device is marked as an in/out FIFO, ensure it is | |
1da177e4 LT |
469 | * set non-coherent. |
470 | */ | |
471 | if (stp->dev_flags & DEV_FLAGS_IN) | |
c1dcb14e | 472 | cmd0 |= DSCR_CMD0_SN; /* Source in FIFO */ |
1da177e4 | 473 | if (dtp->dev_flags & DEV_FLAGS_OUT) |
c1dcb14e | 474 | cmd0 |= DSCR_CMD0_DN; /* Destination out FIFO */ |
1da177e4 | 475 | |
c1dcb14e SS |
476 | /* |
477 | * Set up source1. For now, assume no stride and increment. | |
1da177e4 LT |
478 | * A channel attribute update can change this later. |
479 | */ | |
480 | switch (stp->dev_tsize) { | |
481 | case 1: | |
482 | src1 |= DSCR_SRC1_STS(DSCR_xTS_SIZE1); | |
483 | break; | |
484 | case 2: | |
485 | src1 |= DSCR_SRC1_STS(DSCR_xTS_SIZE2); | |
486 | break; | |
487 | case 4: | |
488 | src1 |= DSCR_SRC1_STS(DSCR_xTS_SIZE4); | |
489 | break; | |
490 | case 8: | |
491 | default: | |
492 | src1 |= DSCR_SRC1_STS(DSCR_xTS_SIZE8); | |
493 | break; | |
494 | } | |
495 | ||
c1dcb14e | 496 | /* If source input is FIFO, set static address. */ |
1da177e4 | 497 | if (stp->dev_flags & DEV_FLAGS_IN) { |
c1dcb14e | 498 | if (stp->dev_flags & DEV_FLAGS_BURSTABLE) |
e3ad1c23 PP |
499 | src1 |= DSCR_SRC1_SAM(DSCR_xAM_BURST); |
500 | else | |
c1dcb14e | 501 | src1 |= DSCR_SRC1_SAM(DSCR_xAM_STATIC); |
1da177e4 | 502 | } |
c1dcb14e | 503 | |
e3ad1c23 PP |
504 | if (stp->dev_physaddr) |
505 | src0 = stp->dev_physaddr; | |
1da177e4 | 506 | |
c1dcb14e SS |
507 | /* |
508 | * Set up dest1. For now, assume no stride and increment. | |
1da177e4 LT |
509 | * A channel attribute update can change this later. |
510 | */ | |
511 | switch (dtp->dev_tsize) { | |
512 | case 1: | |
513 | dest1 |= DSCR_DEST1_DTS(DSCR_xTS_SIZE1); | |
514 | break; | |
515 | case 2: | |
516 | dest1 |= DSCR_DEST1_DTS(DSCR_xTS_SIZE2); | |
517 | break; | |
518 | case 4: | |
519 | dest1 |= DSCR_DEST1_DTS(DSCR_xTS_SIZE4); | |
520 | break; | |
521 | case 8: | |
522 | default: | |
523 | dest1 |= DSCR_DEST1_DTS(DSCR_xTS_SIZE8); | |
524 | break; | |
525 | } | |
526 | ||
c1dcb14e | 527 | /* If destination output is FIFO, set static address. */ |
1da177e4 | 528 | if (dtp->dev_flags & DEV_FLAGS_OUT) { |
c1dcb14e SS |
529 | if (dtp->dev_flags & DEV_FLAGS_BURSTABLE) |
530 | dest1 |= DSCR_DEST1_DAM(DSCR_xAM_BURST); | |
531 | else | |
532 | dest1 |= DSCR_DEST1_DAM(DSCR_xAM_STATIC); | |
1da177e4 | 533 | } |
c1dcb14e | 534 | |
e3ad1c23 PP |
535 | if (dtp->dev_physaddr) |
536 | dest0 = dtp->dev_physaddr; | |
1da177e4 | 537 | |
e3ad1c23 | 538 | #if 0 |
c1dcb14e SS |
539 | printk(KERN_DEBUG "did:%x sid:%x cmd0:%x cmd1:%x source0:%x " |
540 | "source1:%x dest0:%x dest1:%x\n", | |
541 | dtp->dev_id, stp->dev_id, cmd0, cmd1, src0, | |
542 | src1, dest0, dest1); | |
e3ad1c23 | 543 | #endif |
c1dcb14e | 544 | for (i = 0; i < entries; i++) { |
1da177e4 LT |
545 | dp->dscr_cmd0 = cmd0; |
546 | dp->dscr_cmd1 = cmd1; | |
547 | dp->dscr_source0 = src0; | |
548 | dp->dscr_source1 = src1; | |
549 | dp->dscr_dest0 = dest0; | |
550 | dp->dscr_dest1 = dest1; | |
551 | dp->dscr_stat = 0; | |
13bb199f PP |
552 | dp->sw_context = 0; |
553 | dp->sw_status = 0; | |
1da177e4 LT |
554 | dp->dscr_nxtptr = DSCR_NXTPTR(virt_to_phys(dp + 1)); |
555 | dp++; | |
556 | } | |
557 | ||
c1dcb14e | 558 | /* Make last descrptor point to the first. */ |
1da177e4 LT |
559 | dp--; |
560 | dp->dscr_nxtptr = DSCR_NXTPTR(virt_to_phys(ctp->chan_desc_base)); | |
561 | ctp->get_ptr = ctp->put_ptr = ctp->cur_ptr = ctp->chan_desc_base; | |
562 | ||
c1dcb14e | 563 | return (u32)ctp->chan_desc_base; |
1da177e4 | 564 | } |
e3ad1c23 | 565 | EXPORT_SYMBOL(au1xxx_dbdma_ring_alloc); |
1da177e4 | 566 | |
c1dcb14e SS |
567 | /* |
568 | * Put a source buffer into the DMA ring. | |
1da177e4 LT |
569 | * This updates the source pointer and byte count. Normally used |
570 | * for memory to fifo transfers. | |
571 | */ | |
963accbc | 572 | u32 au1xxx_dbdma_put_source(u32 chanid, dma_addr_t buf, int nbytes, u32 flags) |
1da177e4 LT |
573 | { |
574 | chan_tab_t *ctp; | |
575 | au1x_ddma_desc_t *dp; | |
576 | ||
c1dcb14e SS |
577 | /* |
578 | * I guess we could check this to be within the | |
1da177e4 LT |
579 | * range of the table...... |
580 | */ | |
c1dcb14e | 581 | ctp = *(chan_tab_t **)chanid; |
1da177e4 | 582 | |
c1dcb14e SS |
583 | /* |
584 | * We should have multiple callers for a particular channel, | |
1da177e4 LT |
585 | * an interrupt doesn't affect this pointer nor the descriptor, |
586 | * so no locking should be needed. | |
587 | */ | |
588 | dp = ctp->put_ptr; | |
589 | ||
c1dcb14e SS |
590 | /* |
591 | * If the descriptor is valid, we are way ahead of the DMA | |
1da177e4 LT |
592 | * engine, so just return an error condition. |
593 | */ | |
c1dcb14e | 594 | if (dp->dscr_cmd0 & DSCR_CMD0_V) |
1da177e4 | 595 | return 0; |
1da177e4 | 596 | |
c1dcb14e | 597 | /* Load up buffer address and byte count. */ |
963accbc | 598 | dp->dscr_source0 = buf & ~0UL; |
1da177e4 | 599 | dp->dscr_cmd1 = nbytes; |
c1dcb14e | 600 | /* Check flags */ |
e3ad1c23 PP |
601 | if (flags & DDMA_FLAGS_IE) |
602 | dp->dscr_cmd0 |= DSCR_CMD0_IE; | |
603 | if (flags & DDMA_FLAGS_NOIE) | |
604 | dp->dscr_cmd0 &= ~DSCR_CMD0_IE; | |
1da177e4 | 605 | |
e3ad1c23 PP |
606 | /* |
607 | * There is an errata on the Au1200/Au1550 parts that could result | |
c1dcb14e SS |
608 | * in "stale" data being DMA'ed. It has to do with the snoop logic on |
609 | * the cache eviction buffer. DMA_NONCOHERENT is on by default for | |
610 | * these parts. If it is fixed in the future, these dma_cache_inv will | |
e3ad1c23 | 611 | * just be nothing more than empty macros. See io.h. |
c1dcb14e | 612 | */ |
2d32ffa4 | 613 | dma_cache_wback_inv((unsigned long)buf, nbytes); |
c1dcb14e | 614 | dp->dscr_cmd0 |= DSCR_CMD0_V; /* Let it rip */ |
e3ad1c23 | 615 | au_sync(); |
42ecda1a | 616 | dma_cache_wback_inv((unsigned long)dp, sizeof(*dp)); |
c1dcb14e | 617 | ctp->chan_ptr->ddma_dbell = 0; |
e3ad1c23 | 618 | |
c1dcb14e | 619 | /* Get next descriptor pointer. */ |
13bb199f PP |
620 | ctp->put_ptr = phys_to_virt(DSCR_GET_NXTPTR(dp->dscr_nxtptr)); |
621 | ||
c1dcb14e | 622 | /* Return something non-zero. */ |
1da177e4 LT |
623 | return nbytes; |
624 | } | |
ea071cc7 | 625 | EXPORT_SYMBOL(au1xxx_dbdma_put_source); |
1da177e4 LT |
626 | |
627 | /* Put a destination buffer into the DMA ring. | |
628 | * This updates the destination pointer and byte count. Normally used | |
629 | * to place an empty buffer into the ring for fifo to memory transfers. | |
630 | */ | |
963accbc | 631 | u32 au1xxx_dbdma_put_dest(u32 chanid, dma_addr_t buf, int nbytes, u32 flags) |
1da177e4 LT |
632 | { |
633 | chan_tab_t *ctp; | |
634 | au1x_ddma_desc_t *dp; | |
635 | ||
636 | /* I guess we could check this to be within the | |
637 | * range of the table...... | |
638 | */ | |
639 | ctp = *((chan_tab_t **)chanid); | |
640 | ||
641 | /* We should have multiple callers for a particular channel, | |
642 | * an interrupt doesn't affect this pointer nor the descriptor, | |
643 | * so no locking should be needed. | |
644 | */ | |
645 | dp = ctp->put_ptr; | |
646 | ||
647 | /* If the descriptor is valid, we are way ahead of the DMA | |
648 | * engine, so just return an error condition. | |
649 | */ | |
650 | if (dp->dscr_cmd0 & DSCR_CMD0_V) | |
651 | return 0; | |
652 | ||
e3ad1c23 PP |
653 | /* Load up buffer address and byte count */ |
654 | ||
655 | /* Check flags */ | |
656 | if (flags & DDMA_FLAGS_IE) | |
657 | dp->dscr_cmd0 |= DSCR_CMD0_IE; | |
658 | if (flags & DDMA_FLAGS_NOIE) | |
659 | dp->dscr_cmd0 &= ~DSCR_CMD0_IE; | |
660 | ||
963accbc | 661 | dp->dscr_dest0 = buf & ~0UL; |
1da177e4 | 662 | dp->dscr_cmd1 = nbytes; |
e3ad1c23 | 663 | #if 0 |
c1dcb14e SS |
664 | printk(KERN_DEBUG "cmd0:%x cmd1:%x source0:%x source1:%x dest0:%x dest1:%x\n", |
665 | dp->dscr_cmd0, dp->dscr_cmd1, dp->dscr_source0, | |
666 | dp->dscr_source1, dp->dscr_dest0, dp->dscr_dest1); | |
e3ad1c23 PP |
667 | #endif |
668 | /* | |
669 | * There is an errata on the Au1200/Au1550 parts that could result in | |
c1dcb14e SS |
670 | * "stale" data being DMA'ed. It has to do with the snoop logic on the |
671 | * cache eviction buffer. DMA_NONCOHERENT is on by default for these | |
672 | * parts. If it is fixed in the future, these dma_cache_inv will just | |
e3ad1c23 | 673 | * be nothing more than empty macros. See io.h. |
c1dcb14e | 674 | */ |
21a151d8 | 675 | dma_cache_inv((unsigned long)buf, nbytes); |
1da177e4 | 676 | dp->dscr_cmd0 |= DSCR_CMD0_V; /* Let it rip */ |
e3ad1c23 | 677 | au_sync(); |
42ecda1a | 678 | dma_cache_wback_inv((unsigned long)dp, sizeof(*dp)); |
c1dcb14e | 679 | ctp->chan_ptr->ddma_dbell = 0; |
1da177e4 | 680 | |
c1dcb14e | 681 | /* Get next descriptor pointer. */ |
1da177e4 LT |
682 | ctp->put_ptr = phys_to_virt(DSCR_GET_NXTPTR(dp->dscr_nxtptr)); |
683 | ||
c1dcb14e | 684 | /* Return something non-zero. */ |
1da177e4 LT |
685 | return nbytes; |
686 | } | |
ea071cc7 | 687 | EXPORT_SYMBOL(au1xxx_dbdma_put_dest); |
1da177e4 | 688 | |
c1dcb14e SS |
689 | /* |
690 | * Get a destination buffer into the DMA ring. | |
1da177e4 LT |
691 | * Normally used to get a full buffer from the ring during fifo |
692 | * to memory transfers. This does not set the valid bit, you will | |
693 | * have to put another destination buffer to keep the DMA going. | |
694 | */ | |
c1dcb14e | 695 | u32 au1xxx_dbdma_get_dest(u32 chanid, void **buf, int *nbytes) |
1da177e4 LT |
696 | { |
697 | chan_tab_t *ctp; | |
698 | au1x_ddma_desc_t *dp; | |
699 | u32 rv; | |
700 | ||
c1dcb14e SS |
701 | /* |
702 | * I guess we could check this to be within the | |
1da177e4 LT |
703 | * range of the table...... |
704 | */ | |
705 | ctp = *((chan_tab_t **)chanid); | |
706 | ||
c1dcb14e SS |
707 | /* |
708 | * We should have multiple callers for a particular channel, | |
1da177e4 LT |
709 | * an interrupt doesn't affect this pointer nor the descriptor, |
710 | * so no locking should be needed. | |
711 | */ | |
712 | dp = ctp->get_ptr; | |
713 | ||
c1dcb14e SS |
714 | /* |
715 | * If the descriptor is valid, we are way ahead of the DMA | |
1da177e4 LT |
716 | * engine, so just return an error condition. |
717 | */ | |
718 | if (dp->dscr_cmd0 & DSCR_CMD0_V) | |
719 | return 0; | |
720 | ||
c1dcb14e | 721 | /* Return buffer address and byte count. */ |
1da177e4 LT |
722 | *buf = (void *)(phys_to_virt(dp->dscr_dest0)); |
723 | *nbytes = dp->dscr_cmd1; | |
724 | rv = dp->dscr_stat; | |
725 | ||
c1dcb14e | 726 | /* Get next descriptor pointer. */ |
1da177e4 LT |
727 | ctp->get_ptr = phys_to_virt(DSCR_GET_NXTPTR(dp->dscr_nxtptr)); |
728 | ||
c1dcb14e | 729 | /* Return something non-zero. */ |
1da177e4 LT |
730 | return rv; |
731 | } | |
3e2c6ef3 DP |
732 | EXPORT_SYMBOL_GPL(au1xxx_dbdma_get_dest); |
733 | ||
c1dcb14e | 734 | void au1xxx_dbdma_stop(u32 chanid) |
1da177e4 LT |
735 | { |
736 | chan_tab_t *ctp; | |
e3ad1c23 | 737 | au1x_dma_chan_t *cp; |
1da177e4 LT |
738 | int halt_timeout = 0; |
739 | ||
740 | ctp = *((chan_tab_t **)chanid); | |
741 | ||
742 | cp = ctp->chan_ptr; | |
743 | cp->ddma_cfg &= ~DDMA_CFG_EN; /* Disable channel */ | |
744 | au_sync(); | |
745 | while (!(cp->ddma_stat & DDMA_STAT_H)) { | |
746 | udelay(1); | |
747 | halt_timeout++; | |
748 | if (halt_timeout > 100) { | |
c1dcb14e | 749 | printk(KERN_WARNING "warning: DMA channel won't halt\n"); |
1da177e4 LT |
750 | break; |
751 | } | |
752 | } | |
753 | /* clear current desc valid and doorbell */ | |
754 | cp->ddma_stat |= (DDMA_STAT_DB | DDMA_STAT_V); | |
755 | au_sync(); | |
756 | } | |
e3ad1c23 | 757 | EXPORT_SYMBOL(au1xxx_dbdma_stop); |
1da177e4 | 758 | |
c1dcb14e SS |
759 | /* |
760 | * Start using the current descriptor pointer. If the DBDMA encounters | |
761 | * a non-valid descriptor, it will stop. In this case, we can just | |
1da177e4 LT |
762 | * continue by adding a buffer to the list and starting again. |
763 | */ | |
c1dcb14e | 764 | void au1xxx_dbdma_start(u32 chanid) |
1da177e4 LT |
765 | { |
766 | chan_tab_t *ctp; | |
e3ad1c23 | 767 | au1x_dma_chan_t *cp; |
1da177e4 LT |
768 | |
769 | ctp = *((chan_tab_t **)chanid); | |
1da177e4 LT |
770 | cp = ctp->chan_ptr; |
771 | cp->ddma_desptr = virt_to_phys(ctp->cur_ptr); | |
772 | cp->ddma_cfg |= DDMA_CFG_EN; /* Enable channel */ | |
773 | au_sync(); | |
e3ad1c23 | 774 | cp->ddma_dbell = 0; |
1da177e4 LT |
775 | au_sync(); |
776 | } | |
e3ad1c23 | 777 | EXPORT_SYMBOL(au1xxx_dbdma_start); |
1da177e4 | 778 | |
c1dcb14e | 779 | void au1xxx_dbdma_reset(u32 chanid) |
1da177e4 LT |
780 | { |
781 | chan_tab_t *ctp; | |
782 | au1x_ddma_desc_t *dp; | |
783 | ||
784 | au1xxx_dbdma_stop(chanid); | |
785 | ||
786 | ctp = *((chan_tab_t **)chanid); | |
787 | ctp->get_ptr = ctp->put_ptr = ctp->cur_ptr = ctp->chan_desc_base; | |
788 | ||
c1dcb14e | 789 | /* Run through the descriptors and reset the valid indicator. */ |
1da177e4 LT |
790 | dp = ctp->chan_desc_base; |
791 | ||
792 | do { | |
793 | dp->dscr_cmd0 &= ~DSCR_CMD0_V; | |
c1dcb14e SS |
794 | /* |
795 | * Reset our software status -- this is used to determine | |
796 | * if a descriptor is in use by upper level software. Since | |
e3ad1c23 PP |
797 | * posting can reset 'V' bit. |
798 | */ | |
799 | dp->sw_status = 0; | |
1da177e4 LT |
800 | dp = phys_to_virt(DSCR_GET_NXTPTR(dp->dscr_nxtptr)); |
801 | } while (dp != ctp->chan_desc_base); | |
802 | } | |
e3ad1c23 | 803 | EXPORT_SYMBOL(au1xxx_dbdma_reset); |
1da177e4 | 804 | |
c1dcb14e | 805 | u32 au1xxx_get_dma_residue(u32 chanid) |
1da177e4 LT |
806 | { |
807 | chan_tab_t *ctp; | |
e3ad1c23 | 808 | au1x_dma_chan_t *cp; |
1da177e4 LT |
809 | u32 rv; |
810 | ||
811 | ctp = *((chan_tab_t **)chanid); | |
812 | cp = ctp->chan_ptr; | |
813 | ||
c1dcb14e | 814 | /* This is only valid if the channel is stopped. */ |
1da177e4 LT |
815 | rv = cp->ddma_bytecnt; |
816 | au_sync(); | |
817 | ||
818 | return rv; | |
819 | } | |
3e2c6ef3 DP |
820 | EXPORT_SYMBOL_GPL(au1xxx_get_dma_residue); |
821 | ||
c1dcb14e | 822 | void au1xxx_dbdma_chan_free(u32 chanid) |
1da177e4 LT |
823 | { |
824 | chan_tab_t *ctp; | |
825 | dbdev_tab_t *stp, *dtp; | |
826 | ||
827 | ctp = *((chan_tab_t **)chanid); | |
828 | stp = ctp->chan_src; | |
829 | dtp = ctp->chan_dest; | |
830 | ||
831 | au1xxx_dbdma_stop(chanid); | |
832 | ||
22f4bb68 | 833 | kfree((void *)ctp->cdb_membase); |
1da177e4 LT |
834 | |
835 | stp->dev_flags &= ~DEV_FLAGS_INUSE; | |
836 | dtp->dev_flags &= ~DEV_FLAGS_INUSE; | |
837 | chan_tab_ptr[ctp->chan_index] = NULL; | |
838 | ||
839 | kfree(ctp); | |
840 | } | |
e3ad1c23 | 841 | EXPORT_SYMBOL(au1xxx_dbdma_chan_free); |
1da177e4 | 842 | |
c1dcb14e | 843 | static irqreturn_t dbdma_interrupt(int irq, void *dev_id) |
1da177e4 | 844 | { |
2d32ffa4 PP |
845 | u32 intstat; |
846 | u32 chan_index; | |
1da177e4 LT |
847 | chan_tab_t *ctp; |
848 | au1x_ddma_desc_t *dp; | |
e3ad1c23 | 849 | au1x_dma_chan_t *cp; |
1da177e4 LT |
850 | |
851 | intstat = dbdma_gptr->ddma_intstat; | |
852 | au_sync(); | |
4b366732 | 853 | chan_index = __ffs(intstat); |
1da177e4 LT |
854 | |
855 | ctp = chan_tab_ptr[chan_index]; | |
856 | cp = ctp->chan_ptr; | |
857 | dp = ctp->cur_ptr; | |
858 | ||
c1dcb14e | 859 | /* Reset interrupt. */ |
1da177e4 LT |
860 | cp->ddma_irq = 0; |
861 | au_sync(); | |
862 | ||
863 | if (ctp->chan_callback) | |
c1dcb14e | 864 | ctp->chan_callback(irq, ctp->chan_callparam); |
1da177e4 LT |
865 | |
866 | ctp->cur_ptr = phys_to_virt(DSCR_GET_NXTPTR(dp->dscr_nxtptr)); | |
2d32ffa4 | 867 | return IRQ_RETVAL(1); |
1da177e4 LT |
868 | } |
869 | ||
c1dcb14e | 870 | void au1xxx_dbdma_dump(u32 chanid) |
1da177e4 | 871 | { |
c1dcb14e SS |
872 | chan_tab_t *ctp; |
873 | au1x_ddma_desc_t *dp; | |
874 | dbdev_tab_t *stp, *dtp; | |
875 | au1x_dma_chan_t *cp; | |
876 | u32 i = 0; | |
1da177e4 LT |
877 | |
878 | ctp = *((chan_tab_t **)chanid); | |
879 | stp = ctp->chan_src; | |
880 | dtp = ctp->chan_dest; | |
881 | cp = ctp->chan_ptr; | |
882 | ||
52d7ecd0 | 883 | printk(KERN_DEBUG "Chan %x, stp %x (dev %d) dtp %x (dev %d)\n", |
c1dcb14e SS |
884 | (u32)ctp, (u32)stp, stp - dbdev_tab, (u32)dtp, |
885 | dtp - dbdev_tab); | |
886 | printk(KERN_DEBUG "desc base %x, get %x, put %x, cur %x\n", | |
887 | (u32)(ctp->chan_desc_base), (u32)(ctp->get_ptr), | |
888 | (u32)(ctp->put_ptr), (u32)(ctp->cur_ptr)); | |
889 | ||
890 | printk(KERN_DEBUG "dbdma chan %x\n", (u32)cp); | |
891 | printk(KERN_DEBUG "cfg %08x, desptr %08x, statptr %08x\n", | |
892 | cp->ddma_cfg, cp->ddma_desptr, cp->ddma_statptr); | |
893 | printk(KERN_DEBUG "dbell %08x, irq %08x, stat %08x, bytecnt %08x\n", | |
894 | cp->ddma_dbell, cp->ddma_irq, cp->ddma_stat, | |
895 | cp->ddma_bytecnt); | |
896 | ||
897 | /* Run through the descriptors */ | |
1da177e4 LT |
898 | dp = ctp->chan_desc_base; |
899 | ||
900 | do { | |
c1dcb14e SS |
901 | printk(KERN_DEBUG "Dp[%d]= %08x, cmd0 %08x, cmd1 %08x\n", |
902 | i++, (u32)dp, dp->dscr_cmd0, dp->dscr_cmd1); | |
903 | printk(KERN_DEBUG "src0 %08x, src1 %08x, dest0 %08x, dest1 %08x\n", | |
904 | dp->dscr_source0, dp->dscr_source1, | |
905 | dp->dscr_dest0, dp->dscr_dest1); | |
906 | printk(KERN_DEBUG "stat %08x, nxtptr %08x\n", | |
907 | dp->dscr_stat, dp->dscr_nxtptr); | |
1da177e4 LT |
908 | dp = phys_to_virt(DSCR_GET_NXTPTR(dp->dscr_nxtptr)); |
909 | } while (dp != ctp->chan_desc_base); | |
910 | } | |
911 | ||
e3ad1c23 PP |
912 | /* Put a descriptor into the DMA ring. |
913 | * This updates the source/destination pointers and byte count. | |
914 | */ | |
c1dcb14e | 915 | u32 au1xxx_dbdma_put_dscr(u32 chanid, au1x_ddma_desc_t *dscr) |
e3ad1c23 PP |
916 | { |
917 | chan_tab_t *ctp; | |
918 | au1x_ddma_desc_t *dp; | |
c1dcb14e | 919 | u32 nbytes = 0; |
e3ad1c23 | 920 | |
c1dcb14e SS |
921 | /* |
922 | * I guess we could check this to be within the | |
923 | * range of the table...... | |
924 | */ | |
e3ad1c23 PP |
925 | ctp = *((chan_tab_t **)chanid); |
926 | ||
c1dcb14e SS |
927 | /* |
928 | * We should have multiple callers for a particular channel, | |
929 | * an interrupt doesn't affect this pointer nor the descriptor, | |
930 | * so no locking should be needed. | |
931 | */ | |
e3ad1c23 PP |
932 | dp = ctp->put_ptr; |
933 | ||
c1dcb14e SS |
934 | /* |
935 | * If the descriptor is valid, we are way ahead of the DMA | |
936 | * engine, so just return an error condition. | |
937 | */ | |
e3ad1c23 PP |
938 | if (dp->dscr_cmd0 & DSCR_CMD0_V) |
939 | return 0; | |
940 | ||
c1dcb14e | 941 | /* Load up buffer addresses and byte count. */ |
e3ad1c23 PP |
942 | dp->dscr_dest0 = dscr->dscr_dest0; |
943 | dp->dscr_source0 = dscr->dscr_source0; | |
944 | dp->dscr_dest1 = dscr->dscr_dest1; | |
945 | dp->dscr_source1 = dscr->dscr_source1; | |
946 | dp->dscr_cmd1 = dscr->dscr_cmd1; | |
947 | nbytes = dscr->dscr_cmd1; | |
948 | /* Allow the caller to specifiy if an interrupt is generated */ | |
949 | dp->dscr_cmd0 &= ~DSCR_CMD0_IE; | |
950 | dp->dscr_cmd0 |= dscr->dscr_cmd0 | DSCR_CMD0_V; | |
951 | ctp->chan_ptr->ddma_dbell = 0; | |
952 | ||
c1dcb14e | 953 | /* Get next descriptor pointer. */ |
e3ad1c23 PP |
954 | ctp->put_ptr = phys_to_virt(DSCR_GET_NXTPTR(dp->dscr_nxtptr)); |
955 | ||
c1dcb14e | 956 | /* Return something non-zero. */ |
e3ad1c23 PP |
957 | return nbytes; |
958 | } | |
959 | ||
96d660c4 ML |
960 | |
961 | struct alchemy_dbdma_sysdev { | |
962 | struct sys_device sysdev; | |
963 | u32 pm_regs[NUM_DBDMA_CHANS + 1][6]; | |
964 | }; | |
965 | ||
966 | static int alchemy_dbdma_suspend(struct sys_device *dev, | |
967 | pm_message_t state) | |
ac15dad0 | 968 | { |
96d660c4 ML |
969 | struct alchemy_dbdma_sysdev *sdev = |
970 | container_of(dev, struct alchemy_dbdma_sysdev, sysdev); | |
ac15dad0 ML |
971 | int i; |
972 | u32 addr; | |
973 | ||
974 | addr = DDMA_GLOBAL_BASE; | |
96d660c4 ML |
975 | sdev->pm_regs[0][0] = au_readl(addr + 0x00); |
976 | sdev->pm_regs[0][1] = au_readl(addr + 0x04); | |
977 | sdev->pm_regs[0][2] = au_readl(addr + 0x08); | |
978 | sdev->pm_regs[0][3] = au_readl(addr + 0x0c); | |
ac15dad0 ML |
979 | |
980 | /* save channel configurations */ | |
c2e32149 | 981 | for (i = 1, addr = DDMA_CHANNEL_BASE; i <= NUM_DBDMA_CHANS; i++) { |
96d660c4 ML |
982 | sdev->pm_regs[i][0] = au_readl(addr + 0x00); |
983 | sdev->pm_regs[i][1] = au_readl(addr + 0x04); | |
984 | sdev->pm_regs[i][2] = au_readl(addr + 0x08); | |
985 | sdev->pm_regs[i][3] = au_readl(addr + 0x0c); | |
986 | sdev->pm_regs[i][4] = au_readl(addr + 0x10); | |
987 | sdev->pm_regs[i][5] = au_readl(addr + 0x14); | |
ac15dad0 ML |
988 | |
989 | /* halt channel */ | |
96d660c4 | 990 | au_writel(sdev->pm_regs[i][0] & ~1, addr + 0x00); |
ac15dad0 ML |
991 | au_sync(); |
992 | while (!(au_readl(addr + 0x14) & 1)) | |
993 | au_sync(); | |
994 | ||
995 | addr += 0x100; /* next channel base */ | |
996 | } | |
997 | /* disable channel interrupts */ | |
998 | au_writel(0, DDMA_GLOBAL_BASE + 0x0c); | |
999 | au_sync(); | |
96d660c4 ML |
1000 | |
1001 | return 0; | |
ac15dad0 ML |
1002 | } |
1003 | ||
96d660c4 | 1004 | static int alchemy_dbdma_resume(struct sys_device *dev) |
ac15dad0 | 1005 | { |
96d660c4 ML |
1006 | struct alchemy_dbdma_sysdev *sdev = |
1007 | container_of(dev, struct alchemy_dbdma_sysdev, sysdev); | |
ac15dad0 ML |
1008 | int i; |
1009 | u32 addr; | |
1010 | ||
1011 | addr = DDMA_GLOBAL_BASE; | |
96d660c4 ML |
1012 | au_writel(sdev->pm_regs[0][0], addr + 0x00); |
1013 | au_writel(sdev->pm_regs[0][1], addr + 0x04); | |
1014 | au_writel(sdev->pm_regs[0][2], addr + 0x08); | |
1015 | au_writel(sdev->pm_regs[0][3], addr + 0x0c); | |
ac15dad0 ML |
1016 | |
1017 | /* restore channel configurations */ | |
c2e32149 | 1018 | for (i = 1, addr = DDMA_CHANNEL_BASE; i <= NUM_DBDMA_CHANS; i++) { |
96d660c4 ML |
1019 | au_writel(sdev->pm_regs[i][0], addr + 0x00); |
1020 | au_writel(sdev->pm_regs[i][1], addr + 0x04); | |
1021 | au_writel(sdev->pm_regs[i][2], addr + 0x08); | |
1022 | au_writel(sdev->pm_regs[i][3], addr + 0x0c); | |
1023 | au_writel(sdev->pm_regs[i][4], addr + 0x10); | |
1024 | au_writel(sdev->pm_regs[i][5], addr + 0x14); | |
ac15dad0 ML |
1025 | au_sync(); |
1026 | addr += 0x100; /* next channel base */ | |
1027 | } | |
96d660c4 ML |
1028 | |
1029 | return 0; | |
1030 | } | |
1031 | ||
1032 | static struct sysdev_class alchemy_dbdma_sysdev_class = { | |
1033 | .name = "dbdma", | |
1034 | .suspend = alchemy_dbdma_suspend, | |
1035 | .resume = alchemy_dbdma_resume, | |
1036 | }; | |
1037 | ||
1038 | static int __init alchemy_dbdma_sysdev_init(void) | |
1039 | { | |
1040 | struct alchemy_dbdma_sysdev *sdev; | |
1041 | int ret; | |
1042 | ||
1043 | ret = sysdev_class_register(&alchemy_dbdma_sysdev_class); | |
1044 | if (ret) | |
1045 | return ret; | |
1046 | ||
1047 | sdev = kzalloc(sizeof(struct alchemy_dbdma_sysdev), GFP_KERNEL); | |
1048 | if (!sdev) | |
1049 | return -ENOMEM; | |
1050 | ||
1051 | sdev->sysdev.id = -1; | |
1052 | sdev->sysdev.cls = &alchemy_dbdma_sysdev_class; | |
1053 | ret = sysdev_register(&sdev->sysdev); | |
1054 | if (ret) | |
1055 | kfree(sdev); | |
1056 | ||
1057 | return ret; | |
ac15dad0 | 1058 | } |
78814465 ML |
1059 | |
1060 | static int __init au1xxx_dbdma_init(void) | |
1061 | { | |
1062 | int irq_nr, ret; | |
1063 | ||
1064 | dbdma_gptr->ddma_config = 0; | |
1065 | dbdma_gptr->ddma_throttle = 0; | |
1066 | dbdma_gptr->ddma_inten = 0xffff; | |
1067 | au_sync(); | |
1068 | ||
1069 | switch (alchemy_get_cputype()) { | |
1070 | case ALCHEMY_CPU_AU1550: | |
1071 | irq_nr = AU1550_DDMA_INT; | |
1072 | break; | |
1073 | case ALCHEMY_CPU_AU1200: | |
1074 | irq_nr = AU1200_DDMA_INT; | |
1075 | break; | |
1076 | default: | |
1077 | return -ENODEV; | |
1078 | } | |
1079 | ||
1080 | ret = request_irq(irq_nr, dbdma_interrupt, IRQF_DISABLED, | |
1081 | "Au1xxx dbdma", (void *)dbdma_gptr); | |
1082 | if (ret) | |
1083 | printk(KERN_ERR "Cannot grab DBDMA interrupt!\n"); | |
1084 | else { | |
1085 | dbdma_initialized = 1; | |
1086 | printk(KERN_INFO "Alchemy DBDMA initialized\n"); | |
96d660c4 ML |
1087 | ret = alchemy_dbdma_sysdev_init(); |
1088 | if (ret) { | |
1089 | printk(KERN_ERR "DBDMA PM init failed\n"); | |
1090 | ret = 0; | |
1091 | } | |
78814465 ML |
1092 | } |
1093 | ||
1094 | return ret; | |
1095 | } | |
1096 | subsys_initcall(au1xxx_dbdma_init); | |
1097 | ||
1da177e4 | 1098 | #endif /* defined(CONFIG_SOC_AU1550) || defined(CONFIG_SOC_AU1200) */ |