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V4L/DVB (11131): cx231xx: avoid trying to access unfilled dev struct
[linux-2.6/verdex.git] / drivers / ata / pata_mpc52xx.c
blob68d27bc70d06c8722038fe8d459755425fa293bd
1 /*
2 * drivers/ata/pata_mpc52xx.c
3 *
4 * libata driver for the Freescale MPC52xx on-chip IDE interface
5 *
6 * Copyright (C) 2006 Sylvain Munaut <tnt@246tNt.com>
7 * Copyright (C) 2003 Mipsys - Benjamin Herrenschmidt
8 *
9 * UDMA support based on patches by Freescale (Bernard Kuhn, John Rigby),
10 * Domen Puncer and Tim Yamin.
11 *
12 * This file is licensed under the terms of the GNU General Public License
13 * version 2. This program is licensed "as is" without any warranty of any
14 * kind, whether express or implied.
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/slab.h>
20 #include <linux/delay.h>
21 #include <linux/libata.h>
22 #include <linux/of_platform.h>
23 #include <linux/types.h>
24
25 #include <asm/cacheflush.h>
26 #include <asm/prom.h>
27 #include <asm/mpc52xx.h>
28
29 #include <sysdev/bestcomm/bestcomm.h>
30 #include <sysdev/bestcomm/bestcomm_priv.h>
31 #include <sysdev/bestcomm/ata.h>
32
33 #define DRV_NAME "mpc52xx_ata"
34
35 /* Private structures used by the driver */
36 struct mpc52xx_ata_timings {
37 u32 pio1;
38 u32 pio2;
39 u32 mdma1;
40 u32 mdma2;
41 u32 udma1;
42 u32 udma2;
43 u32 udma3;
44 u32 udma4;
45 u32 udma5;
46 int using_udma;
47 };
48
49 struct mpc52xx_ata_priv {
50 unsigned int ipb_period;
51 struct mpc52xx_ata __iomem *ata_regs;
52 phys_addr_t ata_regs_pa;
53 int ata_irq;
54 struct mpc52xx_ata_timings timings[2];
55 int csel;
56
57 /* DMA */
58 struct bcom_task *dmatsk;
59 const struct udmaspec *udmaspec;
60 const struct mdmaspec *mdmaspec;
61 int mpc52xx_ata_dma_last_write;
62 int waiting_for_dma;
63 };
64
65
66 /* ATAPI-4 PIO specs (in ns) */
67 static const int ataspec_t0[5] = {600, 383, 240, 180, 120};
68 static const int ataspec_t1[5] = { 70, 50, 30, 30, 25};
69 static const int ataspec_t2_8[5] = {290, 290, 290, 80, 70};
70 static const int ataspec_t2_16[5] = {165, 125, 100, 80, 70};
71 static const int ataspec_t2i[5] = { 0, 0, 0, 70, 25};
72 static const int ataspec_t4[5] = { 30, 20, 15, 10, 10};
73 static const int ataspec_ta[5] = { 35, 35, 35, 35, 35};
74
75 #define CALC_CLKCYC(c,v) ((((v)+(c)-1)/(c)))
76
77 /* ======================================================================== */
78
79 /* ATAPI-4 MDMA specs (in clocks) */
80 struct mdmaspec {
81 u32 t0M;
82 u32 td;
83 u32 th;
84 u32 tj;
85 u32 tkw;
86 u32 tm;
87 u32 tn;
88 };
89
90 static const struct mdmaspec mdmaspec66[3] = {
91 { .t0M = 32, .td = 15, .th = 2, .tj = 2, .tkw = 15, .tm = 4, .tn = 1 },
92 { .t0M = 10, .td = 6, .th = 1, .tj = 1, .tkw = 4, .tm = 2, .tn = 1 },
93 { .t0M = 8, .td = 5, .th = 1, .tj = 1, .tkw = 2, .tm = 2, .tn = 1 },
94 };
95
96 static const struct mdmaspec mdmaspec132[3] = {
97 { .t0M = 64, .td = 29, .th = 3, .tj = 3, .tkw = 29, .tm = 7, .tn = 2 },
98 { .t0M = 20, .td = 11, .th = 2, .tj = 1, .tkw = 7, .tm = 4, .tn = 1 },
99 { .t0M = 16, .td = 10, .th = 2, .tj = 1, .tkw = 4, .tm = 4, .tn = 1 },
100 };
101
102 /* ATAPI-4 UDMA specs (in clocks) */
103 struct udmaspec {
104 u32 tcyc;
105 u32 t2cyc;
106 u32 tds;
107 u32 tdh;
108 u32 tdvs;
109 u32 tdvh;
110 u32 tfs;
111 u32 tli;
112 u32 tmli;
113 u32 taz;
114 u32 tzah;
115 u32 tenv;
116 u32 tsr;
117 u32 trfs;
118 u32 trp;
119 u32 tack;
120 u32 tss;
121 };
122
123 static const struct udmaspec udmaspec66[6] = {
124 { .tcyc = 8, .t2cyc = 16, .tds = 1, .tdh = 1, .tdvs = 5, .tdvh = 1,
125 .tfs = 16, .tli = 10, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2,
126 .tsr = 3, .trfs = 5, .trp = 11, .tack = 2, .tss = 4,
127 },
128 { .tcyc = 5, .t2cyc = 11, .tds = 1, .tdh = 1, .tdvs = 4, .tdvh = 1,
129 .tfs = 14, .tli = 10, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2,
130 .tsr = 2, .trfs = 5, .trp = 9, .tack = 2, .tss = 4,
131 },
132 { .tcyc = 4, .t2cyc = 8, .tds = 1, .tdh = 1, .tdvs = 3, .tdvh = 1,
133 .tfs = 12, .tli = 10, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2,
134 .tsr = 2, .trfs = 4, .trp = 7, .tack = 2, .tss = 4,
135 },
136 { .tcyc = 3, .t2cyc = 6, .tds = 1, .tdh = 1, .tdvs = 2, .tdvh = 1,
137 .tfs = 9, .tli = 7, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2,
138 .tsr = 2, .trfs = 4, .trp = 7, .tack = 2, .tss = 4,
139 },
140 { .tcyc = 2, .t2cyc = 4, .tds = 1, .tdh = 1, .tdvs = 1, .tdvh = 1,
141 .tfs = 8, .tli = 8, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2,
142 .tsr = 2, .trfs = 4, .trp = 7, .tack = 2, .tss = 4,
143 },
144 { .tcyc = 2, .t2cyc = 2, .tds = 1, .tdh = 1, .tdvs = 1, .tdvh = 1,
145 .tfs = 6, .tli = 5, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2,
146 .tsr = 2, .trfs = 4, .trp = 6, .tack = 2, .tss = 4,
147 },
148 };
149
150 static const struct udmaspec udmaspec132[6] = {
151 { .tcyc = 15, .t2cyc = 31, .tds = 2, .tdh = 1, .tdvs = 10, .tdvh = 1,
152 .tfs = 30, .tli = 20, .tmli = 3, .taz = 2, .tzah = 3, .tenv = 3,
153 .tsr = 7, .trfs = 10, .trp = 22, .tack = 3, .tss = 7,
154 },
155 { .tcyc = 10, .t2cyc = 21, .tds = 2, .tdh = 1, .tdvs = 7, .tdvh = 1,
156 .tfs = 27, .tli = 20, .tmli = 3, .taz = 2, .tzah = 3, .tenv = 3,
157 .tsr = 4, .trfs = 10, .trp = 17, .tack = 3, .tss = 7,
158 },
159 { .tcyc = 6, .t2cyc = 12, .tds = 1, .tdh = 1, .tdvs = 5, .tdvh = 1,
160 .tfs = 23, .tli = 20, .tmli = 3, .taz = 2, .tzah = 3, .tenv = 3,
161 .tsr = 3, .trfs = 8, .trp = 14, .tack = 3, .tss = 7,
162 },
163 { .tcyc = 7, .t2cyc = 12, .tds = 1, .tdh = 1, .tdvs = 3, .tdvh = 1,
164 .tfs = 15, .tli = 13, .tmli = 3, .taz = 2, .tzah = 3, .tenv = 3,
165 .tsr = 3, .trfs = 8, .trp = 14, .tack = 3, .tss = 7,
166 },
167 { .tcyc = 2, .t2cyc = 5, .tds = 0, .tdh = 0, .tdvs = 1, .tdvh = 1,
168 .tfs = 16, .tli = 14, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2,
169 .tsr = 2, .trfs = 7, .trp = 13, .tack = 2, .tss = 6,
170 },
171 { .tcyc = 3, .t2cyc = 6, .tds = 1, .tdh = 1, .tdvs = 1, .tdvh = 1,
172 .tfs = 12, .tli = 10, .tmli = 3, .taz = 2, .tzah = 3, .tenv = 3,
173 .tsr = 3, .trfs = 7, .trp = 12, .tack = 3, .tss = 7,
174 },
175 };
176
177 /* ======================================================================== */
178
179 /* Bit definitions inside the registers */
180 #define MPC52xx_ATA_HOSTCONF_SMR 0x80000000UL /* State machine reset */
181 #define MPC52xx_ATA_HOSTCONF_FR 0x40000000UL /* FIFO Reset */
182 #define MPC52xx_ATA_HOSTCONF_IE 0x02000000UL /* Enable interrupt in PIO */
183 #define MPC52xx_ATA_HOSTCONF_IORDY 0x01000000UL /* Drive supports IORDY protocol */
184
185 #define MPC52xx_ATA_HOSTSTAT_TIP 0x80000000UL /* Transaction in progress */
186 #define MPC52xx_ATA_HOSTSTAT_UREP 0x40000000UL /* UDMA Read Extended Pause */
187 #define MPC52xx_ATA_HOSTSTAT_RERR 0x02000000UL /* Read Error */
188 #define MPC52xx_ATA_HOSTSTAT_WERR 0x01000000UL /* Write Error */
189
190 #define MPC52xx_ATA_FIFOSTAT_EMPTY 0x01 /* FIFO Empty */
191 #define MPC52xx_ATA_FIFOSTAT_ERROR 0x40 /* FIFO Error */
192
193 #define MPC52xx_ATA_DMAMODE_WRITE 0x01 /* Write DMA */
194 #define MPC52xx_ATA_DMAMODE_READ 0x02 /* Read DMA */
195 #define MPC52xx_ATA_DMAMODE_UDMA 0x04 /* UDMA enabled */
196 #define MPC52xx_ATA_DMAMODE_IE 0x08 /* Enable drive interrupt to CPU in DMA mode */
197 #define MPC52xx_ATA_DMAMODE_FE 0x10 /* FIFO Flush enable in Rx mode */
198 #define MPC52xx_ATA_DMAMODE_FR 0x20 /* FIFO Reset */
199 #define MPC52xx_ATA_DMAMODE_HUT 0x40 /* Host UDMA burst terminate */
200
201 #define MAX_DMA_BUFFERS 128
202 #define MAX_DMA_BUFFER_SIZE 0x20000u
203
204 /* Structure of the hardware registers */
205 struct mpc52xx_ata {
206
207 /* Host interface registers */
208 u32 config; /* ATA + 0x00 Host configuration */
209 u32 host_status; /* ATA + 0x04 Host controller status */
210 u32 pio1; /* ATA + 0x08 PIO Timing 1 */
211 u32 pio2; /* ATA + 0x0c PIO Timing 2 */
212 u32 mdma1; /* ATA + 0x10 MDMA Timing 1 */
213 u32 mdma2; /* ATA + 0x14 MDMA Timing 2 */
214 u32 udma1; /* ATA + 0x18 UDMA Timing 1 */
215 u32 udma2; /* ATA + 0x1c UDMA Timing 2 */
216 u32 udma3; /* ATA + 0x20 UDMA Timing 3 */
217 u32 udma4; /* ATA + 0x24 UDMA Timing 4 */
218 u32 udma5; /* ATA + 0x28 UDMA Timing 5 */
219 u32 share_cnt; /* ATA + 0x2c ATA share counter */
220 u32 reserved0[3];
221
222 /* FIFO registers */
223 u32 fifo_data; /* ATA + 0x3c */
224 u8 fifo_status_frame; /* ATA + 0x40 */
225 u8 fifo_status; /* ATA + 0x41 */
226 u16 reserved7[1];
227 u8 fifo_control; /* ATA + 0x44 */
228 u8 reserved8[5];
229 u16 fifo_alarm; /* ATA + 0x4a */
230 u16 reserved9;
231 u16 fifo_rdp; /* ATA + 0x4e */
232 u16 reserved10;
233 u16 fifo_wrp; /* ATA + 0x52 */
234 u16 reserved11;
235 u16 fifo_lfrdp; /* ATA + 0x56 */
236 u16 reserved12;
237 u16 fifo_lfwrp; /* ATA + 0x5a */
238
239 /* Drive TaskFile registers */
240 u8 tf_control; /* ATA + 0x5c TASKFILE Control/Alt Status */
241 u8 reserved13[3];
242 u16 tf_data; /* ATA + 0x60 TASKFILE Data */
243 u16 reserved14;
244 u8 tf_features; /* ATA + 0x64 TASKFILE Features/Error */
245 u8 reserved15[3];
246 u8 tf_sec_count; /* ATA + 0x68 TASKFILE Sector Count */
247 u8 reserved16[3];
248 u8 tf_sec_num; /* ATA + 0x6c TASKFILE Sector Number */
249 u8 reserved17[3];
250 u8 tf_cyl_low; /* ATA + 0x70 TASKFILE Cylinder Low */
251 u8 reserved18[3];
252 u8 tf_cyl_high; /* ATA + 0x74 TASKFILE Cylinder High */
253 u8 reserved19[3];
254 u8 tf_dev_head; /* ATA + 0x78 TASKFILE Device/Head */
255 u8 reserved20[3];
256 u8 tf_command; /* ATA + 0x7c TASKFILE Command/Status */
257 u8 dma_mode; /* ATA + 0x7d ATA Host DMA Mode configuration */
258 u8 reserved21[2];
259 };
260
261
262 /* ======================================================================== */
263 /* Aux fns */
264 /* ======================================================================== */
265
266
267 /* MPC52xx low level hw control */
268 static int
269 mpc52xx_ata_compute_pio_timings(struct mpc52xx_ata_priv *priv, int dev, int pio)
270 {
271 struct mpc52xx_ata_timings *timing = &priv->timings[dev];
272 unsigned int ipb_period = priv->ipb_period;
273 unsigned int t0, t1, t2_8, t2_16, t2i, t4, ta;
274
275 if ((pio < 0) || (pio > 4))
276 return -EINVAL;
277
278 t0 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t0[pio]);
279 t1 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t1[pio]);
280 t2_8 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t2_8[pio]);
281 t2_16 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t2_16[pio]);
282 t2i = CALC_CLKCYC(ipb_period, 1000 * ataspec_t2i[pio]);
283 t4 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t4[pio]);
284 ta = CALC_CLKCYC(ipb_period, 1000 * ataspec_ta[pio]);
285
286 timing->pio1 = (t0 << 24) | (t2_8 << 16) | (t2_16 << 8) | (t2i);
287 timing->pio2 = (t4 << 24) | (t1 << 16) | (ta << 8);
288
289 return 0;
290 }
291
292 static int
293 mpc52xx_ata_compute_mdma_timings(struct mpc52xx_ata_priv *priv, int dev,
294 int speed)
295 {
296 struct mpc52xx_ata_timings *t = &priv->timings[dev];
297 const struct mdmaspec *s = &priv->mdmaspec[speed];
298
299 if (speed < 0 || speed > 2)
300 return -EINVAL;
301
302 t->mdma1 = (s->t0M << 24) | (s->td << 16) | (s->tkw << 8) | (s->tm);
303 t->mdma2 = (s->th << 24) | (s->tj << 16) | (s->tn << 8);
304 t->using_udma = 0;
305
306 return 0;
307 }
308
309 static int
310 mpc52xx_ata_compute_udma_timings(struct mpc52xx_ata_priv *priv, int dev,
311 int speed)
312 {
313 struct mpc52xx_ata_timings *t = &priv->timings[dev];
314 const struct udmaspec *s = &priv->udmaspec[speed];
315
316 if (speed < 0 || speed > 2)
317 return -EINVAL;
318
319 t->udma1 = (s->t2cyc << 24) | (s->tcyc << 16) | (s->tds << 8) | s->tdh;
320 t->udma2 = (s->tdvs << 24) | (s->tdvh << 16) | (s->tfs << 8) | s->tli;
321 t->udma3 = (s->tmli << 24) | (s->taz << 16) | (s->tenv << 8) | s->tsr;
322 t->udma4 = (s->tss << 24) | (s->trfs << 16) | (s->trp << 8) | s->tack;
323 t->udma5 = (s->tzah << 24);
324 t->using_udma = 1;
325
326 return 0;
327 }
328
329 static void
330 mpc52xx_ata_apply_timings(struct mpc52xx_ata_priv *priv, int device)
331 {
332 struct mpc52xx_ata __iomem *regs = priv->ata_regs;
333 struct mpc52xx_ata_timings *timing = &priv->timings[device];
334
335 out_be32(&regs->pio1, timing->pio1);
336 out_be32(&regs->pio2, timing->pio2);
337 out_be32(&regs->mdma1, timing->mdma1);
338 out_be32(&regs->mdma2, timing->mdma2);
339 out_be32(&regs->udma1, timing->udma1);
340 out_be32(&regs->udma2, timing->udma2);
341 out_be32(&regs->udma3, timing->udma3);
342 out_be32(&regs->udma4, timing->udma4);
343 out_be32(&regs->udma5, timing->udma5);
344 priv->csel = device;
345 }
346
347 static int
348 mpc52xx_ata_hw_init(struct mpc52xx_ata_priv *priv)
349 {
350 struct mpc52xx_ata __iomem *regs = priv->ata_regs;
351 int tslot;
352
353 /* Clear share_cnt (all sample code do this ...) */
354 out_be32(&regs->share_cnt, 0);
355
356 /* Configure and reset host */
357 out_be32(&regs->config,
358 MPC52xx_ATA_HOSTCONF_IE |
359 MPC52xx_ATA_HOSTCONF_IORDY |
360 MPC52xx_ATA_HOSTCONF_SMR |
361 MPC52xx_ATA_HOSTCONF_FR);
362
363 udelay(10);
364
365 out_be32(&regs->config,
366 MPC52xx_ATA_HOSTCONF_IE |
367 MPC52xx_ATA_HOSTCONF_IORDY);
368
369 /* Set the time slot to 1us */
370 tslot = CALC_CLKCYC(priv->ipb_period, 1000000);
371 out_be32(&regs->share_cnt, tslot << 16);
372
373 /* Init timings to PIO0 */
374 memset(priv->timings, 0x00, 2*sizeof(struct mpc52xx_ata_timings));
375
376 mpc52xx_ata_compute_pio_timings(priv, 0, 0);
377 mpc52xx_ata_compute_pio_timings(priv, 1, 0);
378
379 mpc52xx_ata_apply_timings(priv, 0);
380
381 return 0;
382 }
383
384
385 /* ======================================================================== */
386 /* libata driver */
387 /* ======================================================================== */
388
389 static void
390 mpc52xx_ata_set_piomode(struct ata_port *ap, struct ata_device *adev)
391 {
392 struct mpc52xx_ata_priv *priv = ap->host->private_data;
393 int pio, rv;
394
395 pio = adev->pio_mode - XFER_PIO_0;
396
397 rv = mpc52xx_ata_compute_pio_timings(priv, adev->devno, pio);
398
399 if (rv) {
400 dev_err(ap->dev, "error: invalid PIO mode: %d\n", pio);
401 return;
402 }
403
404 mpc52xx_ata_apply_timings(priv, adev->devno);
405 }
406
407 static void
408 mpc52xx_ata_set_dmamode(struct ata_port *ap, struct ata_device *adev)
409 {
410 struct mpc52xx_ata_priv *priv = ap->host->private_data;
411 int rv;
412
413 if (adev->dma_mode >= XFER_UDMA_0) {
414 int dma = adev->dma_mode - XFER_UDMA_0;
415 rv = mpc52xx_ata_compute_udma_timings(priv, adev->devno, dma);
416 } else {
417 int dma = adev->dma_mode - XFER_MW_DMA_0;
418 rv = mpc52xx_ata_compute_mdma_timings(priv, adev->devno, dma);
419 }
420
421 if (rv) {
422 dev_alert(ap->dev,
423 "Trying to select invalid DMA mode %d\n",
424 adev->dma_mode);
425 return;
426 }
427
428 mpc52xx_ata_apply_timings(priv, adev->devno);
429 }
430
431 static void
432 mpc52xx_ata_dev_select(struct ata_port *ap, unsigned int device)
433 {
434 struct mpc52xx_ata_priv *priv = ap->host->private_data;
435
436 if (device != priv->csel)
437 mpc52xx_ata_apply_timings(priv, device);
438
439 ata_sff_dev_select(ap, device);
440 }
441
442 static int
443 mpc52xx_ata_build_dmatable(struct ata_queued_cmd *qc)
444 {
445 struct ata_port *ap = qc->ap;
446 struct mpc52xx_ata_priv *priv = ap->host->private_data;
447 struct bcom_ata_bd *bd;
448 unsigned int read = !(qc->tf.flags & ATA_TFLAG_WRITE), si;
449 struct scatterlist *sg;
450 int count = 0;
451
452 if (read)
453 bcom_ata_rx_prepare(priv->dmatsk);
454 else
455 bcom_ata_tx_prepare(priv->dmatsk);
456
457 for_each_sg(qc->sg, sg, qc->n_elem, si) {
458 dma_addr_t cur_addr = sg_dma_address(sg);
459 u32 cur_len = sg_dma_len(sg);
460
461 while (cur_len) {
462 unsigned int tc = min(cur_len, MAX_DMA_BUFFER_SIZE);
463 bd = (struct bcom_ata_bd *)
464 bcom_prepare_next_buffer(priv->dmatsk);
465
466 if (read) {
467 bd->status = tc;
468 bd->src_pa = (__force u32) priv->ata_regs_pa +
469 offsetof(struct mpc52xx_ata, fifo_data);
470 bd->dst_pa = (__force u32) cur_addr;
471 } else {
472 bd->status = tc;
473 bd->src_pa = (__force u32) cur_addr;
474 bd->dst_pa = (__force u32) priv->ata_regs_pa +
475 offsetof(struct mpc52xx_ata, fifo_data);
476 }
477
478 bcom_submit_next_buffer(priv->dmatsk, NULL);
479
480 cur_addr += tc;
481 cur_len -= tc;
482 count++;
483
484 if (count > MAX_DMA_BUFFERS) {
485 dev_alert(ap->dev, "dma table"
486 "too small\n");
487 goto use_pio_instead;
488 }
489 }
490 }
491 return 1;
492
493 use_pio_instead:
494 bcom_ata_reset_bd(priv->dmatsk);
495 return 0;
496 }
497
498 static void
499 mpc52xx_bmdma_setup(struct ata_queued_cmd *qc)
500 {
501 struct ata_port *ap = qc->ap;
502 struct mpc52xx_ata_priv *priv = ap->host->private_data;
503 struct mpc52xx_ata __iomem *regs = priv->ata_regs;
504
505 unsigned int read = !(qc->tf.flags & ATA_TFLAG_WRITE);
506 u8 dma_mode;
507
508 if (!mpc52xx_ata_build_dmatable(qc))
509 dev_alert(ap->dev, "%s: %i, return 1?\n",
510 __func__, __LINE__);
511
512 /* Check FIFO is OK... */
513 if (in_8(&priv->ata_regs->fifo_status) & MPC52xx_ATA_FIFOSTAT_ERROR)
514 dev_alert(ap->dev, "%s: FIFO error detected: 0x%02x!\n",
515 __func__, in_8(&priv->ata_regs->fifo_status));
516
517 if (read) {
518 dma_mode = MPC52xx_ATA_DMAMODE_IE | MPC52xx_ATA_DMAMODE_READ |
519 MPC52xx_ATA_DMAMODE_FE;
520
521 /* Setup FIFO if direction changed */
522 if (priv->mpc52xx_ata_dma_last_write != 0) {
523 priv->mpc52xx_ata_dma_last_write = 0;
524
525 /* Configure FIFO with granularity to 7 */
526 out_8(&regs->fifo_control, 7);
527 out_be16(&regs->fifo_alarm, 128);
528
529 /* Set FIFO Reset bit (FR) */
530 out_8(&regs->dma_mode, MPC52xx_ATA_DMAMODE_FR);
531 }
532 } else {
533 dma_mode = MPC52xx_ATA_DMAMODE_IE | MPC52xx_ATA_DMAMODE_WRITE;
534
535 /* Setup FIFO if direction changed */
536 if (priv->mpc52xx_ata_dma_last_write != 1) {
537 priv->mpc52xx_ata_dma_last_write = 1;
538
539 /* Configure FIFO with granularity to 4 */
540 out_8(&regs->fifo_control, 4);
541 out_be16(&regs->fifo_alarm, 128);
542 }
543 }
544
545 if (priv->timings[qc->dev->devno].using_udma)
546 dma_mode |= MPC52xx_ATA_DMAMODE_UDMA;
547
548 out_8(&regs->dma_mode, dma_mode);
549 priv->waiting_for_dma = ATA_DMA_ACTIVE;
550
551 ata_wait_idle(ap);
552 ap->ops->sff_exec_command(ap, &qc->tf);
553 }
554
555 static void
556 mpc52xx_bmdma_start(struct ata_queued_cmd *qc)
557 {
558 struct ata_port *ap = qc->ap;
559 struct mpc52xx_ata_priv *priv = ap->host->private_data;
560
561 bcom_set_task_auto_start(priv->dmatsk->tasknum, priv->dmatsk->tasknum);
562 bcom_enable(priv->dmatsk);
563 }
564
565 static void
566 mpc52xx_bmdma_stop(struct ata_queued_cmd *qc)
567 {
568 struct ata_port *ap = qc->ap;
569 struct mpc52xx_ata_priv *priv = ap->host->private_data;
570
571 bcom_disable(priv->dmatsk);
572 bcom_ata_reset_bd(priv->dmatsk);
573 priv->waiting_for_dma = 0;
574
575 /* Check FIFO is OK... */
576 if (in_8(&priv->ata_regs->fifo_status) & MPC52xx_ATA_FIFOSTAT_ERROR)
577 dev_alert(ap->dev, "%s: FIFO error detected: 0x%02x!\n",
578 __func__, in_8(&priv->ata_regs->fifo_status));
579 }
580
581 static u8
582 mpc52xx_bmdma_status(struct ata_port *ap)
583 {
584 struct mpc52xx_ata_priv *priv = ap->host->private_data;
585
586 /* Check FIFO is OK... */
587 if (in_8(&priv->ata_regs->fifo_status) & MPC52xx_ATA_FIFOSTAT_ERROR) {
588 dev_alert(ap->dev, "%s: FIFO error detected: 0x%02x!\n",
589 __func__, in_8(&priv->ata_regs->fifo_status));
590 return priv->waiting_for_dma | ATA_DMA_ERR;
591 }
592
593 return priv->waiting_for_dma;
594 }
595
596 static irqreturn_t
597 mpc52xx_ata_task_irq(int irq, void *vpriv)
598 {
599 struct mpc52xx_ata_priv *priv = vpriv;
600 while (bcom_buffer_done(priv->dmatsk))
601 bcom_retrieve_buffer(priv->dmatsk, NULL, NULL);
602
603 priv->waiting_for_dma |= ATA_DMA_INTR;
604
605 return IRQ_HANDLED;
606 }
607
608 static struct scsi_host_template mpc52xx_ata_sht = {
609 ATA_PIO_SHT(DRV_NAME),
610 };
611
612 static struct ata_port_operations mpc52xx_ata_port_ops = {
613 .inherits = &ata_sff_port_ops,
614 .sff_dev_select = mpc52xx_ata_dev_select,
615 .set_piomode = mpc52xx_ata_set_piomode,
616 .set_dmamode = mpc52xx_ata_set_dmamode,
617 .bmdma_setup = mpc52xx_bmdma_setup,
618 .bmdma_start = mpc52xx_bmdma_start,
619 .bmdma_stop = mpc52xx_bmdma_stop,
620 .bmdma_status = mpc52xx_bmdma_status,
621 .qc_prep = ata_noop_qc_prep,
622 };
623
624 static int __devinit
625 mpc52xx_ata_init_one(struct device *dev, struct mpc52xx_ata_priv *priv,
626 unsigned long raw_ata_regs, int mwdma_mask, int udma_mask)
627 {
628 struct ata_host *host;
629 struct ata_port *ap;
630 struct ata_ioports *aio;
631
632 host = ata_host_alloc(dev, 1);
633 if (!host)
634 return -ENOMEM;
635
636 ap = host->ports[0];
637 ap->flags |= ATA_FLAG_SLAVE_POSS;
638 ap->pio_mask = ATA_PIO4;
639 ap->mwdma_mask = mwdma_mask;
640 ap->udma_mask = udma_mask;
641 ap->ops = &mpc52xx_ata_port_ops;
642 host->private_data = priv;
643
644 aio = &ap->ioaddr;
645 aio->cmd_addr = NULL; /* Don't have a classic reg block */
646 aio->altstatus_addr = &priv->ata_regs->tf_control;
647 aio->ctl_addr = &priv->ata_regs->tf_control;
648 aio->data_addr = &priv->ata_regs->tf_data;
649 aio->error_addr = &priv->ata_regs->tf_features;
650 aio->feature_addr = &priv->ata_regs->tf_features;
651 aio->nsect_addr = &priv->ata_regs->tf_sec_count;
652 aio->lbal_addr = &priv->ata_regs->tf_sec_num;
653 aio->lbam_addr = &priv->ata_regs->tf_cyl_low;
654 aio->lbah_addr = &priv->ata_regs->tf_cyl_high;
655 aio->device_addr = &priv->ata_regs->tf_dev_head;
656 aio->status_addr = &priv->ata_regs->tf_command;
657 aio->command_addr = &priv->ata_regs->tf_command;
658
659 ata_port_desc(ap, "ata_regs 0x%lx", raw_ata_regs);
660
661 /* activate host */
662 return ata_host_activate(host, priv->ata_irq, ata_sff_interrupt, 0,
663 &mpc52xx_ata_sht);
664 }
665
666 static struct mpc52xx_ata_priv *
667 mpc52xx_ata_remove_one(struct device *dev)
668 {
669 struct ata_host *host = dev_get_drvdata(dev);
670 struct mpc52xx_ata_priv *priv = host->private_data;
671
672 ata_host_detach(host);
673
674 return priv;
675 }
676
677
678 /* ======================================================================== */
679 /* OF Platform driver */
680 /* ======================================================================== */
681
682 static int __devinit
683 mpc52xx_ata_probe(struct of_device *op, const struct of_device_id *match)
684 {
685 unsigned int ipb_freq;
686 struct resource res_mem;
687 int ata_irq = 0;
688 struct mpc52xx_ata __iomem *ata_regs;
689 struct mpc52xx_ata_priv *priv = NULL;
690 int rv, ret, task_irq = 0;
691 int mwdma_mask = 0, udma_mask = 0;
692 const __be32 *prop;
693 int proplen;
694 struct bcom_task *dmatsk = NULL;
695
696 /* Get ipb frequency */
697 ipb_freq = mpc52xx_find_ipb_freq(op->node);
698 if (!ipb_freq) {
699 dev_err(&op->dev, "could not determine IPB bus frequency\n");
700 return -ENODEV;
701 }
702
703 /* Get device base address from device tree, request the region
704 * and ioremap it. */
705 rv = of_address_to_resource(op->node, 0, &res_mem);
706 if (rv) {
707 dev_err(&op->dev, "could not determine device base address\n");
708 return rv;
709 }
710
711 if (!devm_request_mem_region(&op->dev, res_mem.start,
712 sizeof(*ata_regs), DRV_NAME)) {
713 dev_err(&op->dev, "error requesting register region\n");
714 return -EBUSY;
715 }
716
717 ata_regs = devm_ioremap(&op->dev, res_mem.start, sizeof(*ata_regs));
718 if (!ata_regs) {
719 dev_err(&op->dev, "error mapping device registers\n");
720 rv = -ENOMEM;
721 goto err;
722 }
723
724 /*
725 * By default, all DMA modes are disabled for the MPC5200. Some
726 * boards don't have the required signals routed to make DMA work.
727 * Also, the MPC5200B has a silicon bug that causes data corruption
728 * with UDMA if it is used at the same time as the LocalPlus bus.
729 *
730 * Instead of trying to guess what modes are usable, check the
731 * ATA device tree node to find out what DMA modes work on the board.
732 * UDMA/MWDMA modes can also be forced by adding "libata.force=<mode>"
733 * to the kernel boot parameters.
734 *
735 * The MPC5200 ATA controller supports MWDMA modes 0, 1 and 2 and
736 * UDMA modes 0, 1 and 2.
737 */
738 prop = of_get_property(op->node, "mwdma-mode", &proplen);
739 if ((prop) && (proplen >= 4))
740 mwdma_mask = ATA_MWDMA2 & ((1 << (*prop + 1)) - 1);
741 prop = of_get_property(op->node, "udma-mode", &proplen);
742 if ((prop) && (proplen >= 4))
743 udma_mask = ATA_UDMA2 & ((1 << (*prop + 1)) - 1);
744
745 ata_irq = irq_of_parse_and_map(op->node, 0);
746 if (ata_irq == NO_IRQ) {
747 dev_err(&op->dev, "error mapping irq\n");
748 return -EINVAL;
749 }
750
751 /* Prepare our private structure */
752 priv = devm_kzalloc(&op->dev, sizeof(*priv), GFP_ATOMIC);
753 if (!priv) {
754 dev_err(&op->dev, "error allocating private structure\n");
755 rv = -ENOMEM;
756 goto err;
757 }
758
759 priv->ipb_period = 1000000000 / (ipb_freq / 1000);
760 priv->ata_regs = ata_regs;
761 priv->ata_regs_pa = res_mem.start;
762 priv->ata_irq = ata_irq;
763 priv->csel = -1;
764 priv->mpc52xx_ata_dma_last_write = -1;
765
766 if (ipb_freq/1000000 == 66) {
767 priv->mdmaspec = mdmaspec66;
768 priv->udmaspec = udmaspec66;
769 } else {
770 priv->mdmaspec = mdmaspec132;
771 priv->udmaspec = udmaspec132;
772 }
773
774 /* Allocate a BestComm task for DMA */
775 dmatsk = bcom_ata_init(MAX_DMA_BUFFERS, MAX_DMA_BUFFER_SIZE);
776 if (!dmatsk) {
777 dev_err(&op->dev, "bestcomm initialization failed\n");
778 rv = -ENOMEM;
779 goto err;
780 }
781
782 task_irq = bcom_get_task_irq(dmatsk);
783 ret = request_irq(task_irq, &mpc52xx_ata_task_irq, IRQF_DISABLED,
784 "ATA task", priv);
785 if (ret) {
786 dev_err(&op->dev, "error requesting DMA IRQ\n");
787 goto err;
788 }
789 priv->dmatsk = dmatsk;
790
791 /* Init the hw */
792 rv = mpc52xx_ata_hw_init(priv);
793 if (rv) {
794 dev_err(&op->dev, "error initializing hardware\n");
795 goto err;
796 }
797
798 /* Register ourselves to libata */
799 rv = mpc52xx_ata_init_one(&op->dev, priv, res_mem.start,
800 mwdma_mask, udma_mask);
801 if (rv) {
802 dev_err(&op->dev, "error registering with ATA layer\n");
803 goto err;
804 }
805
806 return 0;
807
808 err:
809 devm_release_mem_region(&op->dev, res_mem.start, sizeof(*ata_regs));
810 if (ata_irq)
811 irq_dispose_mapping(ata_irq);
812 if (task_irq)
813 irq_dispose_mapping(task_irq);
814 if (dmatsk)
815 bcom_ata_release(dmatsk);
816 if (ata_regs)
817 devm_iounmap(&op->dev, ata_regs);
818 if (priv)
819 devm_kfree(&op->dev, priv);
820 return rv;
821 }
822
823 static int
824 mpc52xx_ata_remove(struct of_device *op)
825 {
826 struct mpc52xx_ata_priv *priv;
827 int task_irq;
828
829 /* Deregister the ATA interface */
830 priv = mpc52xx_ata_remove_one(&op->dev);
831
832 /* Clean up DMA */
833 task_irq = bcom_get_task_irq(priv->dmatsk);
834 irq_dispose_mapping(task_irq);
835 bcom_ata_release(priv->dmatsk);
836 irq_dispose_mapping(priv->ata_irq);
837
838 /* Clear up IO allocations */
839 devm_iounmap(&op->dev, priv->ata_regs);
840 devm_release_mem_region(&op->dev, priv->ata_regs_pa,
841 sizeof(*priv->ata_regs));
842 devm_kfree(&op->dev, priv);
843
844 return 0;
845 }
846
847
848 #ifdef CONFIG_PM
849
850 static int
851 mpc52xx_ata_suspend(struct of_device *op, pm_message_t state)
852 {
853 struct ata_host *host = dev_get_drvdata(&op->dev);
854
855 return ata_host_suspend(host, state);
856 }
857
858 static int
859 mpc52xx_ata_resume(struct of_device *op)
860 {
861 struct ata_host *host = dev_get_drvdata(&op->dev);
862 struct mpc52xx_ata_priv *priv = host->private_data;
863 int rv;
864
865 rv = mpc52xx_ata_hw_init(priv);
866 if (rv) {
867 dev_err(host->dev, "error initializing hardware\n");
868 return rv;
869 }
870
871 ata_host_resume(host);
872
873 return 0;
874 }
875
876 #endif
877
878
879 static struct of_device_id mpc52xx_ata_of_match[] = {
880 { .compatible = "fsl,mpc5200-ata", },
881 { .compatible = "mpc5200-ata", },
882 {},
883 };
884
885
886 static struct of_platform_driver mpc52xx_ata_of_platform_driver = {
887 .owner = THIS_MODULE,
888 .name = DRV_NAME,
889 .match_table = mpc52xx_ata_of_match,
890 .probe = mpc52xx_ata_probe,
891 .remove = mpc52xx_ata_remove,
892 #ifdef CONFIG_PM
893 .suspend = mpc52xx_ata_suspend,
894 .resume = mpc52xx_ata_resume,
895 #endif
896 .driver = {
897 .name = DRV_NAME,
898 .owner = THIS_MODULE,
899 },
900 };
901
902
903 /* ======================================================================== */
904 /* Module */
905 /* ======================================================================== */
906
907 static int __init
908 mpc52xx_ata_init(void)
909 {
910 printk(KERN_INFO "ata: MPC52xx IDE/ATA libata driver\n");
911 return of_register_platform_driver(&mpc52xx_ata_of_platform_driver);
912 }
913
914 static void __exit
915 mpc52xx_ata_exit(void)
916 {
917 of_unregister_platform_driver(&mpc52xx_ata_of_platform_driver);
918 }
919
920 module_init(mpc52xx_ata_init);
921 module_exit(mpc52xx_ata_exit);
922
923 MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
924 MODULE_DESCRIPTION("Freescale MPC52xx IDE/ATA libata driver");
925 MODULE_LICENSE("GPL");
926 MODULE_DEVICE_TABLE(of, mpc52xx_ata_of_match);
927
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