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/gfp.h>
20 #include <linux/delay.h>
21 #include <linux/libata.h>
22 #include <linux/of.h>
23 #include <linux/of_address.h>
24 #include <linux/of_irq.h>
25 #include <linux/platform_device.h>
26 #include <linux/types.h>
27
28 #include <asm/cacheflush.h>
29 #include <asm/mpc52xx.h>
30
31 #include <linux/fsl/bestcomm/bestcomm.h>
32 #include <linux/fsl/bestcomm/bestcomm_priv.h>
33 #include <linux/fsl/bestcomm/ata.h>
34
35 #define DRV_NAME "mpc52xx_ata"
36
37 /* Private structures used by the driver */
38 struct mpc52xx_ata_timings {
39 u32 pio1;
40 u32 pio2;
41 u32 mdma1;
42 u32 mdma2;
43 u32 udma1;
44 u32 udma2;
45 u32 udma3;
46 u32 udma4;
47 u32 udma5;
48 int using_udma;
49 };
50
51 struct mpc52xx_ata_priv {
52 unsigned int ipb_period;
53 struct mpc52xx_ata __iomem *ata_regs;
54 phys_addr_t ata_regs_pa;
55 int ata_irq;
56 struct mpc52xx_ata_timings timings[2];
57 int csel;
58
59 /* DMA */
60 struct bcom_task *dmatsk;
61 const struct udmaspec *udmaspec;
62 const struct mdmaspec *mdmaspec;
63 int mpc52xx_ata_dma_last_write;
64 int waiting_for_dma;
65 };
66
67
68 /* ATAPI-4 PIO specs (in ns) */
69 static const u16 ataspec_t0[5] = {600, 383, 240, 180, 120};
70 static const u16 ataspec_t1[5] = { 70, 50, 30, 30, 25};
71 static const u16 ataspec_t2_8[5] = {290, 290, 290, 80, 70};
72 static const u16 ataspec_t2_16[5] = {165, 125, 100, 80, 70};
73 static const u16 ataspec_t2i[5] = { 0, 0, 0, 70, 25};
74 static const u16 ataspec_t4[5] = { 30, 20, 15, 10, 10};
75 static const u16 ataspec_ta[5] = { 35, 35, 35, 35, 35};
76
77 #define CALC_CLKCYC(c,v) ((((v)+(c)-1)/(c)))
78
79 /* ======================================================================== */
80
81 /* ATAPI-4 MDMA specs (in clocks) */
82 struct mdmaspec {
83 u8 t0M;
84 u8 td;
85 u8 th;
86 u8 tj;
87 u8 tkw;
88 u8 tm;
89 u8 tn;
90 };
91
92 static const struct mdmaspec mdmaspec66[3] = {
93 { .t0M = 32, .td = 15, .th = 2, .tj = 2, .tkw = 15, .tm = 4, .tn = 1 },
94 { .t0M = 10, .td = 6, .th = 1, .tj = 1, .tkw = 4, .tm = 2, .tn = 1 },
95 { .t0M = 8, .td = 5, .th = 1, .tj = 1, .tkw = 2, .tm = 2, .tn = 1 },
96 };
97
98 static const struct mdmaspec mdmaspec132[3] = {
99 { .t0M = 64, .td = 29, .th = 3, .tj = 3, .tkw = 29, .tm = 7, .tn = 2 },
100 { .t0M = 20, .td = 11, .th = 2, .tj = 1, .tkw = 7, .tm = 4, .tn = 1 },
101 { .t0M = 16, .td = 10, .th = 2, .tj = 1, .tkw = 4, .tm = 4, .tn = 1 },
102 };
103
104 /* ATAPI-4 UDMA specs (in clocks) */
105 struct udmaspec {
106 u8 tcyc;
107 u8 t2cyc;
108 u8 tds;
109 u8 tdh;
110 u8 tdvs;
111 u8 tdvh;
112 u8 tfs;
113 u8 tli;
114 u8 tmli;
115 u8 taz;
116 u8 tzah;
117 u8 tenv;
118 u8 tsr;
119 u8 trfs;
120 u8 trp;
121 u8 tack;
122 u8 tss;
123 };
124
125 static const struct udmaspec udmaspec66[6] = {
126 { .tcyc = 8, .t2cyc = 16, .tds = 1, .tdh = 1, .tdvs = 5, .tdvh = 1,
127 .tfs = 16, .tli = 10, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2,
128 .tsr = 3, .trfs = 5, .trp = 11, .tack = 2, .tss = 4,
129 },
130 { .tcyc = 5, .t2cyc = 11, .tds = 1, .tdh = 1, .tdvs = 4, .tdvh = 1,
131 .tfs = 14, .tli = 10, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2,
132 .tsr = 2, .trfs = 5, .trp = 9, .tack = 2, .tss = 4,
133 },
134 { .tcyc = 4, .t2cyc = 8, .tds = 1, .tdh = 1, .tdvs = 3, .tdvh = 1,
135 .tfs = 12, .tli = 10, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2,
136 .tsr = 2, .trfs = 4, .trp = 7, .tack = 2, .tss = 4,
137 },
138 { .tcyc = 3, .t2cyc = 6, .tds = 1, .tdh = 1, .tdvs = 2, .tdvh = 1,
139 .tfs = 9, .tli = 7, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2,
140 .tsr = 2, .trfs = 4, .trp = 7, .tack = 2, .tss = 4,
141 },
142 { .tcyc = 2, .t2cyc = 4, .tds = 1, .tdh = 1, .tdvs = 1, .tdvh = 1,
143 .tfs = 8, .tli = 8, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2,
144 .tsr = 2, .trfs = 4, .trp = 7, .tack = 2, .tss = 4,
145 },
146 { .tcyc = 2, .t2cyc = 2, .tds = 1, .tdh = 1, .tdvs = 1, .tdvh = 1,
147 .tfs = 6, .tli = 5, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2,
148 .tsr = 2, .trfs = 4, .trp = 6, .tack = 2, .tss = 4,
149 },
150 };
151
152 static const struct udmaspec udmaspec132[6] = {
153 { .tcyc = 15, .t2cyc = 31, .tds = 2, .tdh = 1, .tdvs = 10, .tdvh = 1,
154 .tfs = 30, .tli = 20, .tmli = 3, .taz = 2, .tzah = 3, .tenv = 3,
155 .tsr = 7, .trfs = 10, .trp = 22, .tack = 3, .tss = 7,
156 },
157 { .tcyc = 10, .t2cyc = 21, .tds = 2, .tdh = 1, .tdvs = 7, .tdvh = 1,
158 .tfs = 27, .tli = 20, .tmli = 3, .taz = 2, .tzah = 3, .tenv = 3,
159 .tsr = 4, .trfs = 10, .trp = 17, .tack = 3, .tss = 7,
160 },
161 { .tcyc = 6, .t2cyc = 12, .tds = 1, .tdh = 1, .tdvs = 5, .tdvh = 1,
162 .tfs = 23, .tli = 20, .tmli = 3, .taz = 2, .tzah = 3, .tenv = 3,
163 .tsr = 3, .trfs = 8, .trp = 14, .tack = 3, .tss = 7,
164 },
165 { .tcyc = 7, .t2cyc = 12, .tds = 1, .tdh = 1, .tdvs = 3, .tdvh = 1,
166 .tfs = 15, .tli = 13, .tmli = 3, .taz = 2, .tzah = 3, .tenv = 3,
167 .tsr = 3, .trfs = 8, .trp = 14, .tack = 3, .tss = 7,
168 },
169 { .tcyc = 2, .t2cyc = 5, .tds = 0, .tdh = 0, .tdvs = 1, .tdvh = 1,
170 .tfs = 16, .tli = 14, .tmli = 2, .taz = 1, .tzah = 2, .tenv = 2,
171 .tsr = 2, .trfs = 7, .trp = 13, .tack = 2, .tss = 6,
172 },
173 { .tcyc = 3, .t2cyc = 6, .tds = 1, .tdh = 1, .tdvs = 1, .tdvh = 1,
174 .tfs = 12, .tli = 10, .tmli = 3, .taz = 2, .tzah = 3, .tenv = 3,
175 .tsr = 3, .trfs = 7, .trp = 12, .tack = 3, .tss = 7,
176 },
177 };
178
179 /* ======================================================================== */
180
181 /* Bit definitions inside the registers */
182 #define MPC52xx_ATA_HOSTCONF_SMR 0x80000000UL /* State machine reset */
183 #define MPC52xx_ATA_HOSTCONF_FR 0x40000000UL /* FIFO Reset */
184 #define MPC52xx_ATA_HOSTCONF_IE 0x02000000UL /* Enable interrupt in PIO */
185 #define MPC52xx_ATA_HOSTCONF_IORDY 0x01000000UL /* Drive supports IORDY protocol */
186
187 #define MPC52xx_ATA_HOSTSTAT_TIP 0x80000000UL /* Transaction in progress */
188 #define MPC52xx_ATA_HOSTSTAT_UREP 0x40000000UL /* UDMA Read Extended Pause */
189 #define MPC52xx_ATA_HOSTSTAT_RERR 0x02000000UL /* Read Error */
190 #define MPC52xx_ATA_HOSTSTAT_WERR 0x01000000UL /* Write Error */
191
192 #define MPC52xx_ATA_FIFOSTAT_EMPTY 0x01 /* FIFO Empty */
193 #define MPC52xx_ATA_FIFOSTAT_ERROR 0x40 /* FIFO Error */
194
195 #define MPC52xx_ATA_DMAMODE_WRITE 0x01 /* Write DMA */
196 #define MPC52xx_ATA_DMAMODE_READ 0x02 /* Read DMA */
197 #define MPC52xx_ATA_DMAMODE_UDMA 0x04 /* UDMA enabled */
198 #define MPC52xx_ATA_DMAMODE_IE 0x08 /* Enable drive interrupt to CPU in DMA mode */
199 #define MPC52xx_ATA_DMAMODE_FE 0x10 /* FIFO Flush enable in Rx mode */
200 #define MPC52xx_ATA_DMAMODE_FR 0x20 /* FIFO Reset */
201 #define MPC52xx_ATA_DMAMODE_HUT 0x40 /* Host UDMA burst terminate */
202
203 #define MAX_DMA_BUFFERS 128
204 #define MAX_DMA_BUFFER_SIZE 0x20000u
205
206 /* Structure of the hardware registers */
207 struct mpc52xx_ata {
208
209 /* Host interface registers */
210 u32 config; /* ATA + 0x00 Host configuration */
211 u32 host_status; /* ATA + 0x04 Host controller status */
212 u32 pio1; /* ATA + 0x08 PIO Timing 1 */
213 u32 pio2; /* ATA + 0x0c PIO Timing 2 */
214 u32 mdma1; /* ATA + 0x10 MDMA Timing 1 */
215 u32 mdma2; /* ATA + 0x14 MDMA Timing 2 */
216 u32 udma1; /* ATA + 0x18 UDMA Timing 1 */
217 u32 udma2; /* ATA + 0x1c UDMA Timing 2 */
218 u32 udma3; /* ATA + 0x20 UDMA Timing 3 */
219 u32 udma4; /* ATA + 0x24 UDMA Timing 4 */
220 u32 udma5; /* ATA + 0x28 UDMA Timing 5 */
221 u32 share_cnt; /* ATA + 0x2c ATA share counter */
222 u32 reserved0[3];
223
224 /* FIFO registers */
225 u32 fifo_data; /* ATA + 0x3c */
226 u8 fifo_status_frame; /* ATA + 0x40 */
227 u8 fifo_status; /* ATA + 0x41 */
228 u16 reserved7[1];
229 u8 fifo_control; /* ATA + 0x44 */
230 u8 reserved8[5];
231 u16 fifo_alarm; /* ATA + 0x4a */
232 u16 reserved9;
233 u16 fifo_rdp; /* ATA + 0x4e */
234 u16 reserved10;
235 u16 fifo_wrp; /* ATA + 0x52 */
236 u16 reserved11;
237 u16 fifo_lfrdp; /* ATA + 0x56 */
238 u16 reserved12;
239 u16 fifo_lfwrp; /* ATA + 0x5a */
240
241 /* Drive TaskFile registers */
242 u8 tf_control; /* ATA + 0x5c TASKFILE Control/Alt Status */
243 u8 reserved13[3];
244 u16 tf_data; /* ATA + 0x60 TASKFILE Data */
245 u16 reserved14;
246 u8 tf_features; /* ATA + 0x64 TASKFILE Features/Error */
247 u8 reserved15[3];
248 u8 tf_sec_count; /* ATA + 0x68 TASKFILE Sector Count */
249 u8 reserved16[3];
250 u8 tf_sec_num; /* ATA + 0x6c TASKFILE Sector Number */
251 u8 reserved17[3];
252 u8 tf_cyl_low; /* ATA + 0x70 TASKFILE Cylinder Low */
253 u8 reserved18[3];
254 u8 tf_cyl_high; /* ATA + 0x74 TASKFILE Cylinder High */
255 u8 reserved19[3];
256 u8 tf_dev_head; /* ATA + 0x78 TASKFILE Device/Head */
257 u8 reserved20[3];
258 u8 tf_command; /* ATA + 0x7c TASKFILE Command/Status */
259 u8 dma_mode; /* ATA + 0x7d ATA Host DMA Mode configuration */
260 u8 reserved21[2];
261 };
262
263
264 /* ======================================================================== */
265 /* Aux fns */
266 /* ======================================================================== */
267
268
269 /* MPC52xx low level hw control */
270 static int
mpc52xx_ata_compute_pio_timings(struct mpc52xx_ata_priv * priv,int dev,int pio)271 mpc52xx_ata_compute_pio_timings(struct mpc52xx_ata_priv *priv, int dev, int pio)
272 {
273 struct mpc52xx_ata_timings *timing = &priv->timings[dev];
274 unsigned int ipb_period = priv->ipb_period;
275 u32 t0, t1, t2_8, t2_16, t2i, t4, ta;
276
277 if ((pio < 0) || (pio > 4))
278 return -EINVAL;
279
280 t0 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t0[pio]);
281 t1 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t1[pio]);
282 t2_8 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t2_8[pio]);
283 t2_16 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t2_16[pio]);
284 t2i = CALC_CLKCYC(ipb_period, 1000 * ataspec_t2i[pio]);
285 t4 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t4[pio]);
286 ta = CALC_CLKCYC(ipb_period, 1000 * ataspec_ta[pio]);
287
288 timing->pio1 = (t0 << 24) | (t2_8 << 16) | (t2_16 << 8) | (t2i);
289 timing->pio2 = (t4 << 24) | (t1 << 16) | (ta << 8);
290
291 return 0;
292 }
293
294 static int
mpc52xx_ata_compute_mdma_timings(struct mpc52xx_ata_priv * priv,int dev,int speed)295 mpc52xx_ata_compute_mdma_timings(struct mpc52xx_ata_priv *priv, int dev,
296 int speed)
297 {
298 struct mpc52xx_ata_timings *t = &priv->timings[dev];
299 const struct mdmaspec *s = &priv->mdmaspec[speed];
300
301 if (speed < 0 || speed > 2)
302 return -EINVAL;
303
304 t->mdma1 = ((u32)s->t0M << 24) | ((u32)s->td << 16) | ((u32)s->tkw << 8) | s->tm;
305 t->mdma2 = ((u32)s->th << 24) | ((u32)s->tj << 16) | ((u32)s->tn << 8);
306 t->using_udma = 0;
307
308 return 0;
309 }
310
311 static int
mpc52xx_ata_compute_udma_timings(struct mpc52xx_ata_priv * priv,int dev,int speed)312 mpc52xx_ata_compute_udma_timings(struct mpc52xx_ata_priv *priv, int dev,
313 int speed)
314 {
315 struct mpc52xx_ata_timings *t = &priv->timings[dev];
316 const struct udmaspec *s = &priv->udmaspec[speed];
317
318 if (speed < 0 || speed > 2)
319 return -EINVAL;
320
321 t->udma1 = ((u32)s->t2cyc << 24) | ((u32)s->tcyc << 16) | ((u32)s->tds << 8) | s->tdh;
322 t->udma2 = ((u32)s->tdvs << 24) | ((u32)s->tdvh << 16) | ((u32)s->tfs << 8) | s->tli;
323 t->udma3 = ((u32)s->tmli << 24) | ((u32)s->taz << 16) | ((u32)s->tenv << 8) | s->tsr;
324 t->udma4 = ((u32)s->tss << 24) | ((u32)s->trfs << 16) | ((u32)s->trp << 8) | s->tack;
325 t->udma5 = (u32)s->tzah << 24;
326 t->using_udma = 1;
327
328 return 0;
329 }
330
331 static void
mpc52xx_ata_apply_timings(struct mpc52xx_ata_priv * priv,int device)332 mpc52xx_ata_apply_timings(struct mpc52xx_ata_priv *priv, int device)
333 {
334 struct mpc52xx_ata __iomem *regs = priv->ata_regs;
335 struct mpc52xx_ata_timings *timing = &priv->timings[device];
336
337 out_be32(®s->pio1, timing->pio1);
338 out_be32(®s->pio2, timing->pio2);
339 out_be32(®s->mdma1, timing->mdma1);
340 out_be32(®s->mdma2, timing->mdma2);
341 out_be32(®s->udma1, timing->udma1);
342 out_be32(®s->udma2, timing->udma2);
343 out_be32(®s->udma3, timing->udma3);
344 out_be32(®s->udma4, timing->udma4);
345 out_be32(®s->udma5, timing->udma5);
346 priv->csel = device;
347 }
348
349 static int
mpc52xx_ata_hw_init(struct mpc52xx_ata_priv * priv)350 mpc52xx_ata_hw_init(struct mpc52xx_ata_priv *priv)
351 {
352 struct mpc52xx_ata __iomem *regs = priv->ata_regs;
353 int tslot;
354
355 /* Clear share_cnt (all sample code do this ...) */
356 out_be32(®s->share_cnt, 0);
357
358 /* Configure and reset host */
359 out_be32(®s->config,
360 MPC52xx_ATA_HOSTCONF_IE |
361 MPC52xx_ATA_HOSTCONF_IORDY |
362 MPC52xx_ATA_HOSTCONF_SMR |
363 MPC52xx_ATA_HOSTCONF_FR);
364
365 udelay(10);
366
367 out_be32(®s->config,
368 MPC52xx_ATA_HOSTCONF_IE |
369 MPC52xx_ATA_HOSTCONF_IORDY);
370
371 /* Set the time slot to 1us */
372 tslot = CALC_CLKCYC(priv->ipb_period, 1000000);
373 out_be32(®s->share_cnt, tslot << 16);
374
375 /* Init timings to PIO0 */
376 memset(priv->timings, 0x00, 2*sizeof(struct mpc52xx_ata_timings));
377
378 mpc52xx_ata_compute_pio_timings(priv, 0, 0);
379 mpc52xx_ata_compute_pio_timings(priv, 1, 0);
380
381 mpc52xx_ata_apply_timings(priv, 0);
382
383 return 0;
384 }
385
386
387 /* ======================================================================== */
388 /* libata driver */
389 /* ======================================================================== */
390
391 static void
mpc52xx_ata_set_piomode(struct ata_port * ap,struct ata_device * adev)392 mpc52xx_ata_set_piomode(struct ata_port *ap, struct ata_device *adev)
393 {
394 struct mpc52xx_ata_priv *priv = ap->host->private_data;
395 int pio, rv;
396
397 pio = adev->pio_mode - XFER_PIO_0;
398
399 rv = mpc52xx_ata_compute_pio_timings(priv, adev->devno, pio);
400
401 if (rv) {
402 dev_err(ap->dev, "error: invalid PIO mode: %d\n", pio);
403 return;
404 }
405
406 mpc52xx_ata_apply_timings(priv, adev->devno);
407 }
408
409 static void
mpc52xx_ata_set_dmamode(struct ata_port * ap,struct ata_device * adev)410 mpc52xx_ata_set_dmamode(struct ata_port *ap, struct ata_device *adev)
411 {
412 struct mpc52xx_ata_priv *priv = ap->host->private_data;
413 int rv;
414
415 if (adev->dma_mode >= XFER_UDMA_0) {
416 int dma = adev->dma_mode - XFER_UDMA_0;
417 rv = mpc52xx_ata_compute_udma_timings(priv, adev->devno, dma);
418 } else {
419 int dma = adev->dma_mode - XFER_MW_DMA_0;
420 rv = mpc52xx_ata_compute_mdma_timings(priv, adev->devno, dma);
421 }
422
423 if (rv) {
424 dev_alert(ap->dev,
425 "Trying to select invalid DMA mode %d\n",
426 adev->dma_mode);
427 return;
428 }
429
430 mpc52xx_ata_apply_timings(priv, adev->devno);
431 }
432
433 static void
mpc52xx_ata_dev_select(struct ata_port * ap,unsigned int device)434 mpc52xx_ata_dev_select(struct ata_port *ap, unsigned int device)
435 {
436 struct mpc52xx_ata_priv *priv = ap->host->private_data;
437
438 if (device != priv->csel)
439 mpc52xx_ata_apply_timings(priv, device);
440
441 ata_sff_dev_select(ap, device);
442 }
443
444 static int
mpc52xx_ata_build_dmatable(struct ata_queued_cmd * qc)445 mpc52xx_ata_build_dmatable(struct ata_queued_cmd *qc)
446 {
447 struct ata_port *ap = qc->ap;
448 struct mpc52xx_ata_priv *priv = ap->host->private_data;
449 struct bcom_ata_bd *bd;
450 unsigned int read = !(qc->tf.flags & ATA_TFLAG_WRITE), si;
451 struct scatterlist *sg;
452 int count = 0;
453
454 if (read)
455 bcom_ata_rx_prepare(priv->dmatsk);
456 else
457 bcom_ata_tx_prepare(priv->dmatsk);
458
459 for_each_sg(qc->sg, sg, qc->n_elem, si) {
460 dma_addr_t cur_addr = sg_dma_address(sg);
461 u32 cur_len = sg_dma_len(sg);
462
463 while (cur_len) {
464 unsigned int tc = min(cur_len, MAX_DMA_BUFFER_SIZE);
465 bd = (struct bcom_ata_bd *)
466 bcom_prepare_next_buffer(priv->dmatsk);
467
468 if (read) {
469 bd->status = tc;
470 bd->src_pa = (__force u32) priv->ata_regs_pa +
471 offsetof(struct mpc52xx_ata, fifo_data);
472 bd->dst_pa = (__force u32) cur_addr;
473 } else {
474 bd->status = tc;
475 bd->src_pa = (__force u32) cur_addr;
476 bd->dst_pa = (__force u32) priv->ata_regs_pa +
477 offsetof(struct mpc52xx_ata, fifo_data);
478 }
479
480 bcom_submit_next_buffer(priv->dmatsk, NULL);
481
482 cur_addr += tc;
483 cur_len -= tc;
484 count++;
485
486 if (count > MAX_DMA_BUFFERS) {
487 dev_alert(ap->dev, "dma table"
488 "too small\n");
489 goto use_pio_instead;
490 }
491 }
492 }
493 return 1;
494
495 use_pio_instead:
496 bcom_ata_reset_bd(priv->dmatsk);
497 return 0;
498 }
499
500 static void
mpc52xx_bmdma_setup(struct ata_queued_cmd * qc)501 mpc52xx_bmdma_setup(struct ata_queued_cmd *qc)
502 {
503 struct ata_port *ap = qc->ap;
504 struct mpc52xx_ata_priv *priv = ap->host->private_data;
505 struct mpc52xx_ata __iomem *regs = priv->ata_regs;
506
507 unsigned int read = !(qc->tf.flags & ATA_TFLAG_WRITE);
508 u8 dma_mode;
509
510 if (!mpc52xx_ata_build_dmatable(qc))
511 dev_alert(ap->dev, "%s: %i, return 1?\n",
512 __func__, __LINE__);
513
514 /* Check FIFO is OK... */
515 if (in_8(&priv->ata_regs->fifo_status) & MPC52xx_ATA_FIFOSTAT_ERROR)
516 dev_alert(ap->dev, "%s: FIFO error detected: 0x%02x!\n",
517 __func__, in_8(&priv->ata_regs->fifo_status));
518
519 if (read) {
520 dma_mode = MPC52xx_ATA_DMAMODE_IE | MPC52xx_ATA_DMAMODE_READ |
521 MPC52xx_ATA_DMAMODE_FE;
522
523 /* Setup FIFO if direction changed */
524 if (priv->mpc52xx_ata_dma_last_write != 0) {
525 priv->mpc52xx_ata_dma_last_write = 0;
526
527 /* Configure FIFO with granularity to 7 */
528 out_8(®s->fifo_control, 7);
529 out_be16(®s->fifo_alarm, 128);
530
531 /* Set FIFO Reset bit (FR) */
532 out_8(®s->dma_mode, MPC52xx_ATA_DMAMODE_FR);
533 }
534 } else {
535 dma_mode = MPC52xx_ATA_DMAMODE_IE | MPC52xx_ATA_DMAMODE_WRITE;
536
537 /* Setup FIFO if direction changed */
538 if (priv->mpc52xx_ata_dma_last_write != 1) {
539 priv->mpc52xx_ata_dma_last_write = 1;
540
541 /* Configure FIFO with granularity to 4 */
542 out_8(®s->fifo_control, 4);
543 out_be16(®s->fifo_alarm, 128);
544 }
545 }
546
547 if (priv->timings[qc->dev->devno].using_udma)
548 dma_mode |= MPC52xx_ATA_DMAMODE_UDMA;
549
550 out_8(®s->dma_mode, dma_mode);
551 priv->waiting_for_dma = ATA_DMA_ACTIVE;
552
553 ata_wait_idle(ap);
554 ap->ops->sff_exec_command(ap, &qc->tf);
555 }
556
557 static void
mpc52xx_bmdma_start(struct ata_queued_cmd * qc)558 mpc52xx_bmdma_start(struct ata_queued_cmd *qc)
559 {
560 struct ata_port *ap = qc->ap;
561 struct mpc52xx_ata_priv *priv = ap->host->private_data;
562
563 bcom_set_task_auto_start(priv->dmatsk->tasknum, priv->dmatsk->tasknum);
564 bcom_enable(priv->dmatsk);
565 }
566
567 static void
mpc52xx_bmdma_stop(struct ata_queued_cmd * qc)568 mpc52xx_bmdma_stop(struct ata_queued_cmd *qc)
569 {
570 struct ata_port *ap = qc->ap;
571 struct mpc52xx_ata_priv *priv = ap->host->private_data;
572
573 bcom_disable(priv->dmatsk);
574 bcom_ata_reset_bd(priv->dmatsk);
575 priv->waiting_for_dma = 0;
576
577 /* Check FIFO is OK... */
578 if (in_8(&priv->ata_regs->fifo_status) & MPC52xx_ATA_FIFOSTAT_ERROR)
579 dev_alert(ap->dev, "%s: FIFO error detected: 0x%02x!\n",
580 __func__, in_8(&priv->ata_regs->fifo_status));
581 }
582
583 static u8
mpc52xx_bmdma_status(struct ata_port * ap)584 mpc52xx_bmdma_status(struct ata_port *ap)
585 {
586 struct mpc52xx_ata_priv *priv = ap->host->private_data;
587
588 /* Check FIFO is OK... */
589 if (in_8(&priv->ata_regs->fifo_status) & MPC52xx_ATA_FIFOSTAT_ERROR) {
590 dev_alert(ap->dev, "%s: FIFO error detected: 0x%02x!\n",
591 __func__, in_8(&priv->ata_regs->fifo_status));
592 return priv->waiting_for_dma | ATA_DMA_ERR;
593 }
594
595 return priv->waiting_for_dma;
596 }
597
598 static irqreturn_t
mpc52xx_ata_task_irq(int irq,void * vpriv)599 mpc52xx_ata_task_irq(int irq, void *vpriv)
600 {
601 struct mpc52xx_ata_priv *priv = vpriv;
602 while (bcom_buffer_done(priv->dmatsk))
603 bcom_retrieve_buffer(priv->dmatsk, NULL, NULL);
604
605 priv->waiting_for_dma |= ATA_DMA_INTR;
606
607 return IRQ_HANDLED;
608 }
609
610 static const struct scsi_host_template mpc52xx_ata_sht = {
611 ATA_PIO_SHT(DRV_NAME),
612 };
613
614 static struct ata_port_operations mpc52xx_ata_port_ops = {
615 .inherits = &ata_bmdma_port_ops,
616 .sff_dev_select = mpc52xx_ata_dev_select,
617 .set_piomode = mpc52xx_ata_set_piomode,
618 .set_dmamode = mpc52xx_ata_set_dmamode,
619 .bmdma_setup = mpc52xx_bmdma_setup,
620 .bmdma_start = mpc52xx_bmdma_start,
621 .bmdma_stop = mpc52xx_bmdma_stop,
622 .bmdma_status = mpc52xx_bmdma_status,
623 .qc_prep = ata_noop_qc_prep,
624 };
625
mpc52xx_ata_init_one(struct device * dev,struct mpc52xx_ata_priv * priv,unsigned long raw_ata_regs,int mwdma_mask,int udma_mask)626 static int mpc52xx_ata_init_one(struct device *dev,
627 struct mpc52xx_ata_priv *priv,
628 unsigned long raw_ata_regs,
629 int mwdma_mask, int udma_mask)
630 {
631 struct ata_host *host;
632 struct ata_port *ap;
633 struct ata_ioports *aio;
634
635 host = ata_host_alloc(dev, 1);
636 if (!host)
637 return -ENOMEM;
638
639 ap = host->ports[0];
640 ap->flags |= ATA_FLAG_SLAVE_POSS;
641 ap->pio_mask = ATA_PIO4;
642 ap->mwdma_mask = mwdma_mask;
643 ap->udma_mask = udma_mask;
644 ap->ops = &mpc52xx_ata_port_ops;
645 host->private_data = priv;
646
647 aio = &ap->ioaddr;
648 aio->cmd_addr = NULL; /* Don't have a classic reg block */
649 aio->altstatus_addr = &priv->ata_regs->tf_control;
650 aio->ctl_addr = &priv->ata_regs->tf_control;
651 aio->data_addr = &priv->ata_regs->tf_data;
652 aio->error_addr = &priv->ata_regs->tf_features;
653 aio->feature_addr = &priv->ata_regs->tf_features;
654 aio->nsect_addr = &priv->ata_regs->tf_sec_count;
655 aio->lbal_addr = &priv->ata_regs->tf_sec_num;
656 aio->lbam_addr = &priv->ata_regs->tf_cyl_low;
657 aio->lbah_addr = &priv->ata_regs->tf_cyl_high;
658 aio->device_addr = &priv->ata_regs->tf_dev_head;
659 aio->status_addr = &priv->ata_regs->tf_command;
660 aio->command_addr = &priv->ata_regs->tf_command;
661
662 ata_port_desc(ap, "ata_regs 0x%lx", raw_ata_regs);
663
664 /* activate host */
665 return ata_host_activate(host, priv->ata_irq, ata_bmdma_interrupt, 0,
666 &mpc52xx_ata_sht);
667 }
668
669 /* ======================================================================== */
670 /* OF Platform driver */
671 /* ======================================================================== */
672
mpc52xx_ata_probe(struct platform_device * op)673 static int mpc52xx_ata_probe(struct platform_device *op)
674 {
675 unsigned int ipb_freq;
676 struct resource res_mem;
677 int ata_irq = 0;
678 struct mpc52xx_ata __iomem *ata_regs;
679 struct mpc52xx_ata_priv *priv = NULL;
680 int rv, task_irq;
681 int mwdma_mask = 0, udma_mask = 0;
682 const __be32 *prop;
683 int proplen;
684 struct bcom_task *dmatsk;
685
686 /* Get ipb frequency */
687 ipb_freq = mpc5xxx_get_bus_frequency(&op->dev);
688 if (!ipb_freq) {
689 dev_err(&op->dev, "could not determine IPB bus frequency\n");
690 return -ENODEV;
691 }
692
693 /* Get device base address from device tree, request the region
694 * and ioremap it. */
695 rv = of_address_to_resource(op->dev.of_node, 0, &res_mem);
696 if (rv) {
697 dev_err(&op->dev, "could not determine device base address\n");
698 return rv;
699 }
700
701 if (!devm_request_mem_region(&op->dev, res_mem.start,
702 sizeof(*ata_regs), DRV_NAME)) {
703 dev_err(&op->dev, "error requesting register region\n");
704 return -EBUSY;
705 }
706
707 ata_regs = devm_ioremap(&op->dev, res_mem.start, sizeof(*ata_regs));
708 if (!ata_regs) {
709 dev_err(&op->dev, "error mapping device registers\n");
710 return -ENOMEM;
711 }
712
713 /*
714 * By default, all DMA modes are disabled for the MPC5200. Some
715 * boards don't have the required signals routed to make DMA work.
716 * Also, the MPC5200B has a silicon bug that causes data corruption
717 * with UDMA if it is used at the same time as the LocalPlus bus.
718 *
719 * Instead of trying to guess what modes are usable, check the
720 * ATA device tree node to find out what DMA modes work on the board.
721 * UDMA/MWDMA modes can also be forced by adding "libata.force=<mode>"
722 * to the kernel boot parameters.
723 *
724 * The MPC5200 ATA controller supports MWDMA modes 0, 1 and 2 and
725 * UDMA modes 0, 1 and 2.
726 */
727 prop = of_get_property(op->dev.of_node, "mwdma-mode", &proplen);
728 if ((prop) && (proplen >= 4))
729 mwdma_mask = ATA_MWDMA2 & ((1 << (*prop + 1)) - 1);
730 prop = of_get_property(op->dev.of_node, "udma-mode", &proplen);
731 if ((prop) && (proplen >= 4))
732 udma_mask = ATA_UDMA2 & ((1 << (*prop + 1)) - 1);
733
734 ata_irq = irq_of_parse_and_map(op->dev.of_node, 0);
735 if (!ata_irq) {
736 dev_err(&op->dev, "error mapping irq\n");
737 return -EINVAL;
738 }
739
740 /* Prepare our private structure */
741 priv = devm_kzalloc(&op->dev, sizeof(*priv), GFP_KERNEL);
742 if (!priv) {
743 rv = -ENOMEM;
744 goto err1;
745 }
746
747 priv->ipb_period = 1000000000 / (ipb_freq / 1000);
748 priv->ata_regs = ata_regs;
749 priv->ata_regs_pa = res_mem.start;
750 priv->ata_irq = ata_irq;
751 priv->csel = -1;
752 priv->mpc52xx_ata_dma_last_write = -1;
753
754 if (ipb_freq/1000000 == 66) {
755 priv->mdmaspec = mdmaspec66;
756 priv->udmaspec = udmaspec66;
757 } else {
758 priv->mdmaspec = mdmaspec132;
759 priv->udmaspec = udmaspec132;
760 }
761
762 /* Allocate a BestComm task for DMA */
763 dmatsk = bcom_ata_init(MAX_DMA_BUFFERS, MAX_DMA_BUFFER_SIZE);
764 if (!dmatsk) {
765 dev_err(&op->dev, "bestcomm initialization failed\n");
766 rv = -ENOMEM;
767 goto err1;
768 }
769
770 task_irq = bcom_get_task_irq(dmatsk);
771 rv = devm_request_irq(&op->dev, task_irq, &mpc52xx_ata_task_irq, 0,
772 "ATA task", priv);
773 if (rv) {
774 dev_err(&op->dev, "error requesting DMA IRQ\n");
775 goto err2;
776 }
777 priv->dmatsk = dmatsk;
778
779 /* Init the hw */
780 rv = mpc52xx_ata_hw_init(priv);
781 if (rv) {
782 dev_err(&op->dev, "error initializing hardware\n");
783 goto err2;
784 }
785
786 /* Register ourselves to libata */
787 rv = mpc52xx_ata_init_one(&op->dev, priv, res_mem.start,
788 mwdma_mask, udma_mask);
789 if (rv) {
790 dev_err(&op->dev, "error registering with ATA layer\n");
791 goto err2;
792 }
793
794 return 0;
795
796 err2:
797 irq_dispose_mapping(task_irq);
798 bcom_ata_release(dmatsk);
799 err1:
800 irq_dispose_mapping(ata_irq);
801 return rv;
802 }
803
mpc52xx_ata_remove(struct platform_device * op)804 static void mpc52xx_ata_remove(struct platform_device *op)
805 {
806 struct ata_host *host = platform_get_drvdata(op);
807 struct mpc52xx_ata_priv *priv = host->private_data;
808 int task_irq;
809
810 /* Deregister the ATA interface */
811 ata_platform_remove_one(op);
812
813 /* Clean up DMA */
814 task_irq = bcom_get_task_irq(priv->dmatsk);
815 irq_dispose_mapping(task_irq);
816 bcom_ata_release(priv->dmatsk);
817 irq_dispose_mapping(priv->ata_irq);
818 }
819
820 #ifdef CONFIG_PM_SLEEP
821 static int
mpc52xx_ata_suspend(struct platform_device * op,pm_message_t state)822 mpc52xx_ata_suspend(struct platform_device *op, pm_message_t state)
823 {
824 struct ata_host *host = platform_get_drvdata(op);
825
826 ata_host_suspend(host, state);
827 return 0;
828 }
829
830 static int
mpc52xx_ata_resume(struct platform_device * op)831 mpc52xx_ata_resume(struct platform_device *op)
832 {
833 struct ata_host *host = platform_get_drvdata(op);
834 struct mpc52xx_ata_priv *priv = host->private_data;
835 int rv;
836
837 rv = mpc52xx_ata_hw_init(priv);
838 if (rv) {
839 dev_err(host->dev, "error initializing hardware\n");
840 return rv;
841 }
842
843 ata_host_resume(host);
844
845 return 0;
846 }
847 #endif
848
849 static const struct of_device_id mpc52xx_ata_of_match[] = {
850 { .compatible = "fsl,mpc5200-ata", },
851 { .compatible = "mpc5200-ata", },
852 { /* sentinel */ }
853 };
854
855
856 static struct platform_driver mpc52xx_ata_of_platform_driver = {
857 .probe = mpc52xx_ata_probe,
858 .remove_new = mpc52xx_ata_remove,
859 #ifdef CONFIG_PM_SLEEP
860 .suspend = mpc52xx_ata_suspend,
861 .resume = mpc52xx_ata_resume,
862 #endif
863 .driver = {
864 .name = DRV_NAME,
865 .of_match_table = mpc52xx_ata_of_match,
866 },
867 };
868
869 module_platform_driver(mpc52xx_ata_of_platform_driver);
870
871 MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
872 MODULE_DESCRIPTION("Freescale MPC52xx IDE/ATA libata driver");
873 MODULE_LICENSE("GPL");
874 MODULE_DEVICE_TABLE(of, mpc52xx_ata_of_match);
875
876