1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Libata based driver for Apple "macio" family of PATA controllers
4 *
5 * Copyright 2008/2009 Benjamin Herrenschmidt, IBM Corp
6 * <benh@kernel.crashing.org>
7 *
8 * Some bits and pieces from drivers/ide/ppc/pmac.c
9 *
10 */
11
12 #undef DEBUG
13 #undef DEBUG_DMA
14
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/blkdev.h>
19 #include <linux/ata.h>
20 #include <linux/libata.h>
21 #include <linux/adb.h>
22 #include <linux/pmu.h>
23 #include <linux/scatterlist.h>
24 #include <linux/irqdomain.h>
25 #include <linux/of.h>
26 #include <linux/gfp.h>
27 #include <linux/pci.h>
28
29 #include <scsi/scsi.h>
30 #include <scsi/scsi_host.h>
31 #include <scsi/scsi_device.h>
32
33 #include <asm/macio.h>
34 #include <asm/io.h>
35 #include <asm/dbdma.h>
36 #include <asm/machdep.h>
37 #include <asm/pmac_feature.h>
38 #include <asm/mediabay.h>
39
40 #ifdef DEBUG_DMA
41 #define dev_dbgdma(dev, format, arg...) \
42 dev_printk(KERN_DEBUG , dev , format , ## arg)
43 #else
44 #define dev_dbgdma(dev, format, arg...) \
45 ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
46 #endif
47
48 #define DRV_NAME "pata_macio"
49 #define DRV_VERSION "0.9"
50
51 /* Models of macio ATA controller */
52 enum {
53 controller_ohare, /* OHare based */
54 controller_heathrow, /* Heathrow/Paddington */
55 controller_kl_ata3, /* KeyLargo ATA-3 */
56 controller_kl_ata4, /* KeyLargo ATA-4 */
57 controller_un_ata6, /* UniNorth2 ATA-6 */
58 controller_k2_ata6, /* K2 ATA-6 */
59 controller_sh_ata6, /* Shasta ATA-6 */
60 };
61
62 static const char* macio_ata_names[] = {
63 "OHare ATA", /* OHare based */
64 "Heathrow ATA", /* Heathrow/Paddington */
65 "KeyLargo ATA-3", /* KeyLargo ATA-3 (MDMA only) */
66 "KeyLargo ATA-4", /* KeyLargo ATA-4 (UDMA/66) */
67 "UniNorth ATA-6", /* UniNorth2 ATA-6 (UDMA/100) */
68 "K2 ATA-6", /* K2 ATA-6 (UDMA/100) */
69 "Shasta ATA-6", /* Shasta ATA-6 (UDMA/133) */
70 };
71
72 /*
73 * Extra registers, both 32-bit little-endian
74 */
75 #define IDE_TIMING_CONFIG 0x200
76 #define IDE_INTERRUPT 0x300
77
78 /* Kauai (U2) ATA has different register setup */
79 #define IDE_KAUAI_PIO_CONFIG 0x200
80 #define IDE_KAUAI_ULTRA_CONFIG 0x210
81 #define IDE_KAUAI_POLL_CONFIG 0x220
82
83 /*
84 * Timing configuration register definitions
85 */
86
87 /* Number of IDE_SYSCLK_NS ticks, argument is in nanoseconds */
88 #define SYSCLK_TICKS(t) (((t) + IDE_SYSCLK_NS - 1) / IDE_SYSCLK_NS)
89 #define SYSCLK_TICKS_66(t) (((t) + IDE_SYSCLK_66_NS - 1) / IDE_SYSCLK_66_NS)
90 #define IDE_SYSCLK_NS 30 /* 33Mhz cell */
91 #define IDE_SYSCLK_66_NS 15 /* 66Mhz cell */
92
93 /* 133Mhz cell, found in shasta.
94 * See comments about 100 Mhz Uninorth 2...
95 * Note that PIO_MASK and MDMA_MASK seem to overlap, that's just
96 * weird and I don't now why .. at this stage
97 */
98 #define TR_133_PIOREG_PIO_MASK 0xff000fff
99 #define TR_133_PIOREG_MDMA_MASK 0x00fff800
100 #define TR_133_UDMAREG_UDMA_MASK 0x0003ffff
101 #define TR_133_UDMAREG_UDMA_EN 0x00000001
102
103 /* 100Mhz cell, found in Uninorth 2 and K2. It appears as a pci device
104 * (106b/0033) on uninorth or K2 internal PCI bus and it's clock is
105 * controlled like gem or fw. It appears to be an evolution of keylargo
106 * ATA4 with a timing register extended to 2x32bits registers (one
107 * for PIO & MWDMA and one for UDMA, and a similar DBDMA channel.
108 * It has it's own local feature control register as well.
109 *
110 * After scratching my mind over the timing values, at least for PIO
111 * and MDMA, I think I've figured the format of the timing register,
112 * though I use pre-calculated tables for UDMA as usual...
113 */
114 #define TR_100_PIO_ADDRSETUP_MASK 0xff000000 /* Size of field unknown */
115 #define TR_100_PIO_ADDRSETUP_SHIFT 24
116 #define TR_100_MDMA_MASK 0x00fff000
117 #define TR_100_MDMA_RECOVERY_MASK 0x00fc0000
118 #define TR_100_MDMA_RECOVERY_SHIFT 18
119 #define TR_100_MDMA_ACCESS_MASK 0x0003f000
120 #define TR_100_MDMA_ACCESS_SHIFT 12
121 #define TR_100_PIO_MASK 0xff000fff
122 #define TR_100_PIO_RECOVERY_MASK 0x00000fc0
123 #define TR_100_PIO_RECOVERY_SHIFT 6
124 #define TR_100_PIO_ACCESS_MASK 0x0000003f
125 #define TR_100_PIO_ACCESS_SHIFT 0
126
127 #define TR_100_UDMAREG_UDMA_MASK 0x0000ffff
128 #define TR_100_UDMAREG_UDMA_EN 0x00000001
129
130
131 /* 66Mhz cell, found in KeyLargo. Can do ultra mode 0 to 2 on
132 * 40 connector cable and to 4 on 80 connector one.
133 * Clock unit is 15ns (66Mhz)
134 *
135 * 3 Values can be programmed:
136 * - Write data setup, which appears to match the cycle time. They
137 * also call it DIOW setup.
138 * - Ready to pause time (from spec)
139 * - Address setup. That one is weird. I don't see where exactly
140 * it fits in UDMA cycles, I got it's name from an obscure piece
141 * of commented out code in Darwin. They leave it to 0, we do as
142 * well, despite a comment that would lead to think it has a
143 * min value of 45ns.
144 * Apple also add 60ns to the write data setup (or cycle time ?) on
145 * reads.
146 */
147 #define TR_66_UDMA_MASK 0xfff00000
148 #define TR_66_UDMA_EN 0x00100000 /* Enable Ultra mode for DMA */
149 #define TR_66_PIO_ADDRSETUP_MASK 0xe0000000 /* Address setup */
150 #define TR_66_PIO_ADDRSETUP_SHIFT 29
151 #define TR_66_UDMA_RDY2PAUS_MASK 0x1e000000 /* Ready 2 pause time */
152 #define TR_66_UDMA_RDY2PAUS_SHIFT 25
153 #define TR_66_UDMA_WRDATASETUP_MASK 0x01e00000 /* Write data setup time */
154 #define TR_66_UDMA_WRDATASETUP_SHIFT 21
155 #define TR_66_MDMA_MASK 0x000ffc00
156 #define TR_66_MDMA_RECOVERY_MASK 0x000f8000
157 #define TR_66_MDMA_RECOVERY_SHIFT 15
158 #define TR_66_MDMA_ACCESS_MASK 0x00007c00
159 #define TR_66_MDMA_ACCESS_SHIFT 10
160 #define TR_66_PIO_MASK 0xe00003ff
161 #define TR_66_PIO_RECOVERY_MASK 0x000003e0
162 #define TR_66_PIO_RECOVERY_SHIFT 5
163 #define TR_66_PIO_ACCESS_MASK 0x0000001f
164 #define TR_66_PIO_ACCESS_SHIFT 0
165
166 /* 33Mhz cell, found in OHare, Heathrow (& Paddington) and KeyLargo
167 * Can do pio & mdma modes, clock unit is 30ns (33Mhz)
168 *
169 * The access time and recovery time can be programmed. Some older
170 * Darwin code base limit OHare to 150ns cycle time. I decided to do
171 * the same here fore safety against broken old hardware ;)
172 * The HalfTick bit, when set, adds half a clock (15ns) to the access
173 * time and removes one from recovery. It's not supported on KeyLargo
174 * implementation afaik. The E bit appears to be set for PIO mode 0 and
175 * is used to reach long timings used in this mode.
176 */
177 #define TR_33_MDMA_MASK 0x003ff800
178 #define TR_33_MDMA_RECOVERY_MASK 0x001f0000
179 #define TR_33_MDMA_RECOVERY_SHIFT 16
180 #define TR_33_MDMA_ACCESS_MASK 0x0000f800
181 #define TR_33_MDMA_ACCESS_SHIFT 11
182 #define TR_33_MDMA_HALFTICK 0x00200000
183 #define TR_33_PIO_MASK 0x000007ff
184 #define TR_33_PIO_E 0x00000400
185 #define TR_33_PIO_RECOVERY_MASK 0x000003e0
186 #define TR_33_PIO_RECOVERY_SHIFT 5
187 #define TR_33_PIO_ACCESS_MASK 0x0000001f
188 #define TR_33_PIO_ACCESS_SHIFT 0
189
190 /*
191 * Interrupt register definitions. Only present on newer cells
192 * (Keylargo and later afaik) so we don't use it.
193 */
194 #define IDE_INTR_DMA 0x80000000
195 #define IDE_INTR_DEVICE 0x40000000
196
197 /*
198 * FCR Register on Kauai. Not sure what bit 0x4 is ...
199 */
200 #define KAUAI_FCR_UATA_MAGIC 0x00000004
201 #define KAUAI_FCR_UATA_RESET_N 0x00000002
202 #define KAUAI_FCR_UATA_ENABLE 0x00000001
203
204
205 /* Allow up to 256 DBDMA commands per xfer */
206 #define MAX_DCMDS 256
207
208 /* Don't let a DMA segment go all the way to 64K */
209 #define MAX_DBDMA_SEG 0xff00
210
211
212 /*
213 * Wait 1s for disk to answer on IDE bus after a hard reset
214 * of the device (via GPIO/FCR).
215 *
216 * Some devices seem to "pollute" the bus even after dropping
217 * the BSY bit (typically some combo drives slave on the UDMA
218 * bus) after a hard reset. Since we hard reset all drives on
219 * KeyLargo ATA66, we have to keep that delay around. I may end
220 * up not hard resetting anymore on these and keep the delay only
221 * for older interfaces instead (we have to reset when coming
222 * from MacOS...) --BenH.
223 */
224 #define IDE_WAKEUP_DELAY_MS 1000
225
226 struct pata_macio_timing;
227
228 struct pata_macio_priv {
229 int kind;
230 int aapl_bus_id;
231 int mediabay : 1;
232 struct device_node *node;
233 struct macio_dev *mdev;
234 struct pci_dev *pdev;
235 struct device *dev;
236 int irq;
237 u32 treg[2][2];
238 void __iomem *tfregs;
239 void __iomem *kauai_fcr;
240 struct dbdma_cmd * dma_table_cpu;
241 dma_addr_t dma_table_dma;
242 struct ata_host *host;
243 const struct pata_macio_timing *timings;
244 };
245
246 /* Previous variants of this driver used to calculate timings
247 * for various variants of the chip and use tables for others.
248 *
249 * Not only was this confusing, but in addition, it isn't clear
250 * whether our calculation code was correct. It didn't entirely
251 * match the darwin code and whatever documentation I could find
252 * on these cells
253 *
254 * I decided to entirely rely on a table instead for this version
255 * of the driver. Also, because I don't really care about derated
256 * modes and really old HW other than making it work, I'm not going
257 * to calculate / snoop timing values for something else than the
258 * standard modes.
259 */
260 struct pata_macio_timing {
261 int mode;
262 u32 reg1; /* Bits to set in first timing reg */
263 u32 reg2; /* Bits to set in second timing reg */
264 };
265
266 static const struct pata_macio_timing pata_macio_ohare_timings[] = {
267 { XFER_PIO_0, 0x00000526, 0, },
268 { XFER_PIO_1, 0x00000085, 0, },
269 { XFER_PIO_2, 0x00000025, 0, },
270 { XFER_PIO_3, 0x00000025, 0, },
271 { XFER_PIO_4, 0x00000025, 0, },
272 { XFER_MW_DMA_0, 0x00074000, 0, },
273 { XFER_MW_DMA_1, 0x00221000, 0, },
274 { XFER_MW_DMA_2, 0x00211000, 0, },
275 { -1, 0, 0 }
276 };
277
278 static const struct pata_macio_timing pata_macio_heathrow_timings[] = {
279 { XFER_PIO_0, 0x00000526, 0, },
280 { XFER_PIO_1, 0x00000085, 0, },
281 { XFER_PIO_2, 0x00000025, 0, },
282 { XFER_PIO_3, 0x00000025, 0, },
283 { XFER_PIO_4, 0x00000025, 0, },
284 { XFER_MW_DMA_0, 0x00074000, 0, },
285 { XFER_MW_DMA_1, 0x00221000, 0, },
286 { XFER_MW_DMA_2, 0x00211000, 0, },
287 { -1, 0, 0 }
288 };
289
290 static const struct pata_macio_timing pata_macio_kl33_timings[] = {
291 { XFER_PIO_0, 0x00000526, 0, },
292 { XFER_PIO_1, 0x00000085, 0, },
293 { XFER_PIO_2, 0x00000025, 0, },
294 { XFER_PIO_3, 0x00000025, 0, },
295 { XFER_PIO_4, 0x00000025, 0, },
296 { XFER_MW_DMA_0, 0x00084000, 0, },
297 { XFER_MW_DMA_1, 0x00021800, 0, },
298 { XFER_MW_DMA_2, 0x00011800, 0, },
299 { -1, 0, 0 }
300 };
301
302 static const struct pata_macio_timing pata_macio_kl66_timings[] = {
303 { XFER_PIO_0, 0x0000038c, 0, },
304 { XFER_PIO_1, 0x0000020a, 0, },
305 { XFER_PIO_2, 0x00000127, 0, },
306 { XFER_PIO_3, 0x000000c6, 0, },
307 { XFER_PIO_4, 0x00000065, 0, },
308 { XFER_MW_DMA_0, 0x00084000, 0, },
309 { XFER_MW_DMA_1, 0x00029800, 0, },
310 { XFER_MW_DMA_2, 0x00019400, 0, },
311 { XFER_UDMA_0, 0x19100000, 0, },
312 { XFER_UDMA_1, 0x14d00000, 0, },
313 { XFER_UDMA_2, 0x10900000, 0, },
314 { XFER_UDMA_3, 0x0c700000, 0, },
315 { XFER_UDMA_4, 0x0c500000, 0, },
316 { -1, 0, 0 }
317 };
318
319 static const struct pata_macio_timing pata_macio_kauai_timings[] = {
320 { XFER_PIO_0, 0x08000a92, 0, },
321 { XFER_PIO_1, 0x0800060f, 0, },
322 { XFER_PIO_2, 0x0800038b, 0, },
323 { XFER_PIO_3, 0x05000249, 0, },
324 { XFER_PIO_4, 0x04000148, 0, },
325 { XFER_MW_DMA_0, 0x00618000, 0, },
326 { XFER_MW_DMA_1, 0x00209000, 0, },
327 { XFER_MW_DMA_2, 0x00148000, 0, },
328 { XFER_UDMA_0, 0, 0x000070c1, },
329 { XFER_UDMA_1, 0, 0x00005d81, },
330 { XFER_UDMA_2, 0, 0x00004a61, },
331 { XFER_UDMA_3, 0, 0x00003a51, },
332 { XFER_UDMA_4, 0, 0x00002a31, },
333 { XFER_UDMA_5, 0, 0x00002921, },
334 { -1, 0, 0 }
335 };
336
337 static const struct pata_macio_timing pata_macio_shasta_timings[] = {
338 { XFER_PIO_0, 0x0a000c97, 0, },
339 { XFER_PIO_1, 0x07000712, 0, },
340 { XFER_PIO_2, 0x040003cd, 0, },
341 { XFER_PIO_3, 0x0500028b, 0, },
342 { XFER_PIO_4, 0x0400010a, 0, },
343 { XFER_MW_DMA_0, 0x00820800, 0, },
344 { XFER_MW_DMA_1, 0x0028b000, 0, },
345 { XFER_MW_DMA_2, 0x001ca000, 0, },
346 { XFER_UDMA_0, 0, 0x00035901, },
347 { XFER_UDMA_1, 0, 0x000348b1, },
348 { XFER_UDMA_2, 0, 0x00033881, },
349 { XFER_UDMA_3, 0, 0x00033861, },
350 { XFER_UDMA_4, 0, 0x00033841, },
351 { XFER_UDMA_5, 0, 0x00033031, },
352 { XFER_UDMA_6, 0, 0x00033021, },
353 { -1, 0, 0 }
354 };
355
pata_macio_find_timing(struct pata_macio_priv * priv,int mode)356 static const struct pata_macio_timing *pata_macio_find_timing(
357 struct pata_macio_priv *priv,
358 int mode)
359 {
360 int i;
361
362 for (i = 0; priv->timings[i].mode > 0; i++) {
363 if (priv->timings[i].mode == mode)
364 return &priv->timings[i];
365 }
366 return NULL;
367 }
368
369
pata_macio_apply_timings(struct ata_port * ap,unsigned int device)370 static void pata_macio_apply_timings(struct ata_port *ap, unsigned int device)
371 {
372 struct pata_macio_priv *priv = ap->private_data;
373 void __iomem *rbase = ap->ioaddr.cmd_addr;
374
375 if (priv->kind == controller_sh_ata6 ||
376 priv->kind == controller_un_ata6 ||
377 priv->kind == controller_k2_ata6) {
378 writel(priv->treg[device][0], rbase + IDE_KAUAI_PIO_CONFIG);
379 writel(priv->treg[device][1], rbase + IDE_KAUAI_ULTRA_CONFIG);
380 } else
381 writel(priv->treg[device][0], rbase + IDE_TIMING_CONFIG);
382 }
383
pata_macio_dev_select(struct ata_port * ap,unsigned int device)384 static void pata_macio_dev_select(struct ata_port *ap, unsigned int device)
385 {
386 ata_sff_dev_select(ap, device);
387
388 /* Apply timings */
389 pata_macio_apply_timings(ap, device);
390 }
391
pata_macio_set_timings(struct ata_port * ap,struct ata_device * adev)392 static void pata_macio_set_timings(struct ata_port *ap,
393 struct ata_device *adev)
394 {
395 struct pata_macio_priv *priv = ap->private_data;
396 const struct pata_macio_timing *t;
397
398 dev_dbg(priv->dev, "Set timings: DEV=%d,PIO=0x%x (%s),DMA=0x%x (%s)\n",
399 adev->devno,
400 adev->pio_mode,
401 ata_mode_string(ata_xfer_mode2mask(adev->pio_mode)),
402 adev->dma_mode,
403 ata_mode_string(ata_xfer_mode2mask(adev->dma_mode)));
404
405 /* First clear timings */
406 priv->treg[adev->devno][0] = priv->treg[adev->devno][1] = 0;
407
408 /* Now get the PIO timings */
409 t = pata_macio_find_timing(priv, adev->pio_mode);
410 if (t == NULL) {
411 dev_warn(priv->dev, "Invalid PIO timing requested: 0x%x\n",
412 adev->pio_mode);
413 t = pata_macio_find_timing(priv, XFER_PIO_0);
414 }
415 BUG_ON(t == NULL);
416
417 /* PIO timings only ever use the first treg */
418 priv->treg[adev->devno][0] |= t->reg1;
419
420 /* Now get DMA timings */
421 t = pata_macio_find_timing(priv, adev->dma_mode);
422 if (t == NULL || (t->reg1 == 0 && t->reg2 == 0)) {
423 dev_dbg(priv->dev, "DMA timing not set yet, using MW_DMA_0\n");
424 t = pata_macio_find_timing(priv, XFER_MW_DMA_0);
425 }
426 BUG_ON(t == NULL);
427
428 /* DMA timings can use both tregs */
429 priv->treg[adev->devno][0] |= t->reg1;
430 priv->treg[adev->devno][1] |= t->reg2;
431
432 dev_dbg(priv->dev, " -> %08x %08x\n",
433 priv->treg[adev->devno][0],
434 priv->treg[adev->devno][1]);
435
436 /* Apply to hardware */
437 pata_macio_apply_timings(ap, adev->devno);
438 }
439
440 /*
441 * Blast some well known "safe" values to the timing registers at init or
442 * wakeup from sleep time, before we do real calculation
443 */
pata_macio_default_timings(struct pata_macio_priv * priv)444 static void pata_macio_default_timings(struct pata_macio_priv *priv)
445 {
446 unsigned int value, value2 = 0;
447
448 switch(priv->kind) {
449 case controller_sh_ata6:
450 value = 0x0a820c97;
451 value2 = 0x00033031;
452 break;
453 case controller_un_ata6:
454 case controller_k2_ata6:
455 value = 0x08618a92;
456 value2 = 0x00002921;
457 break;
458 case controller_kl_ata4:
459 value = 0x0008438c;
460 break;
461 case controller_kl_ata3:
462 value = 0x00084526;
463 break;
464 case controller_heathrow:
465 case controller_ohare:
466 default:
467 value = 0x00074526;
468 break;
469 }
470 priv->treg[0][0] = priv->treg[1][0] = value;
471 priv->treg[0][1] = priv->treg[1][1] = value2;
472 }
473
pata_macio_cable_detect(struct ata_port * ap)474 static int pata_macio_cable_detect(struct ata_port *ap)
475 {
476 struct pata_macio_priv *priv = ap->private_data;
477
478 /* Get cable type from device-tree */
479 if (priv->kind == controller_kl_ata4 ||
480 priv->kind == controller_un_ata6 ||
481 priv->kind == controller_k2_ata6 ||
482 priv->kind == controller_sh_ata6) {
483 const char* cable = of_get_property(priv->node, "cable-type",
484 NULL);
485 struct device_node *root = of_find_node_by_path("/");
486 const char *model = of_get_property(root, "model", NULL);
487
488 of_node_put(root);
489
490 if (cable && !strncmp(cable, "80-", 3)) {
491 /* Some drives fail to detect 80c cable in PowerBook
492 * These machine use proprietary short IDE cable
493 * anyway
494 */
495 if (!strncmp(model, "PowerBook", 9))
496 return ATA_CBL_PATA40_SHORT;
497 else
498 return ATA_CBL_PATA80;
499 }
500 }
501
502 /* G5's seem to have incorrect cable type in device-tree.
503 * Let's assume they always have a 80 conductor cable, this seem to
504 * be always the case unless the user mucked around
505 */
506 if (of_device_is_compatible(priv->node, "K2-UATA") ||
507 of_device_is_compatible(priv->node, "shasta-ata"))
508 return ATA_CBL_PATA80;
509
510 /* Anything else is 40 connectors */
511 return ATA_CBL_PATA40;
512 }
513
pata_macio_qc_prep(struct ata_queued_cmd * qc)514 static enum ata_completion_errors pata_macio_qc_prep(struct ata_queued_cmd *qc)
515 {
516 unsigned int write = (qc->tf.flags & ATA_TFLAG_WRITE);
517 struct ata_port *ap = qc->ap;
518 struct pata_macio_priv *priv = ap->private_data;
519 struct scatterlist *sg;
520 struct dbdma_cmd *table;
521 unsigned int si, pi;
522
523 dev_dbgdma(priv->dev, "%s: qc %p flags %lx, write %d dev %d\n",
524 __func__, qc, qc->flags, write, qc->dev->devno);
525
526 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
527 return AC_ERR_OK;
528
529 table = (struct dbdma_cmd *) priv->dma_table_cpu;
530
531 pi = 0;
532 for_each_sg(qc->sg, sg, qc->n_elem, si) {
533 u32 addr, sg_len, len;
534
535 /* determine if physical DMA addr spans 64K boundary.
536 * Note h/w doesn't support 64-bit, so we unconditionally
537 * truncate dma_addr_t to u32.
538 */
539 addr = (u32) sg_dma_address(sg);
540 sg_len = sg_dma_len(sg);
541
542 while (sg_len) {
543 /* table overflow should never happen */
544 BUG_ON (pi++ >= MAX_DCMDS);
545
546 len = (sg_len < MAX_DBDMA_SEG) ? sg_len : MAX_DBDMA_SEG;
547 table->command = cpu_to_le16(write ? OUTPUT_MORE: INPUT_MORE);
548 table->req_count = cpu_to_le16(len);
549 table->phy_addr = cpu_to_le32(addr);
550 table->cmd_dep = 0;
551 table->xfer_status = 0;
552 table->res_count = 0;
553 addr += len;
554 sg_len -= len;
555 ++table;
556 }
557 }
558
559 /* Should never happen according to Tejun */
560 BUG_ON(!pi);
561
562 /* Convert the last command to an input/output */
563 table--;
564 table->command = cpu_to_le16(write ? OUTPUT_LAST: INPUT_LAST);
565 table++;
566
567 /* Add the stop command to the end of the list */
568 memset(table, 0, sizeof(struct dbdma_cmd));
569 table->command = cpu_to_le16(DBDMA_STOP);
570
571 dev_dbgdma(priv->dev, "%s: %d DMA list entries\n", __func__, pi);
572
573 return AC_ERR_OK;
574 }
575
576
pata_macio_freeze(struct ata_port * ap)577 static void pata_macio_freeze(struct ata_port *ap)
578 {
579 struct dbdma_regs __iomem *dma_regs = ap->ioaddr.bmdma_addr;
580
581 if (dma_regs) {
582 unsigned int timeout = 1000000;
583
584 /* Make sure DMA controller is stopped */
585 writel((RUN|PAUSE|FLUSH|WAKE|DEAD) << 16, &dma_regs->control);
586 while (--timeout && (readl(&dma_regs->status) & RUN))
587 udelay(1);
588 }
589
590 ata_sff_freeze(ap);
591 }
592
593
pata_macio_bmdma_setup(struct ata_queued_cmd * qc)594 static void pata_macio_bmdma_setup(struct ata_queued_cmd *qc)
595 {
596 struct ata_port *ap = qc->ap;
597 struct pata_macio_priv *priv = ap->private_data;
598 struct dbdma_regs __iomem *dma_regs = ap->ioaddr.bmdma_addr;
599 int dev = qc->dev->devno;
600
601 dev_dbgdma(priv->dev, "%s: qc %p\n", __func__, qc);
602
603 /* Make sure DMA commands updates are visible */
604 writel(priv->dma_table_dma, &dma_regs->cmdptr);
605
606 /* On KeyLargo 66Mhz cell, we need to add 60ns to wrDataSetup on
607 * UDMA reads
608 */
609 if (priv->kind == controller_kl_ata4 &&
610 (priv->treg[dev][0] & TR_66_UDMA_EN)) {
611 void __iomem *rbase = ap->ioaddr.cmd_addr;
612 u32 reg = priv->treg[dev][0];
613
614 if (!(qc->tf.flags & ATA_TFLAG_WRITE))
615 reg += 0x00800000;
616 writel(reg, rbase + IDE_TIMING_CONFIG);
617 }
618
619 /* issue r/w command */
620 ap->ops->sff_exec_command(ap, &qc->tf);
621 }
622
pata_macio_bmdma_start(struct ata_queued_cmd * qc)623 static void pata_macio_bmdma_start(struct ata_queued_cmd *qc)
624 {
625 struct ata_port *ap = qc->ap;
626 struct pata_macio_priv *priv = ap->private_data;
627 struct dbdma_regs __iomem *dma_regs = ap->ioaddr.bmdma_addr;
628
629 dev_dbgdma(priv->dev, "%s: qc %p\n", __func__, qc);
630
631 writel((RUN << 16) | RUN, &dma_regs->control);
632 /* Make sure it gets to the controller right now */
633 (void)readl(&dma_regs->control);
634 }
635
pata_macio_bmdma_stop(struct ata_queued_cmd * qc)636 static void pata_macio_bmdma_stop(struct ata_queued_cmd *qc)
637 {
638 struct ata_port *ap = qc->ap;
639 struct pata_macio_priv *priv = ap->private_data;
640 struct dbdma_regs __iomem *dma_regs = ap->ioaddr.bmdma_addr;
641 unsigned int timeout = 1000000;
642
643 dev_dbgdma(priv->dev, "%s: qc %p\n", __func__, qc);
644
645 /* Stop the DMA engine and wait for it to full halt */
646 writel (((RUN|WAKE|DEAD) << 16), &dma_regs->control);
647 while (--timeout && (readl(&dma_regs->status) & RUN))
648 udelay(1);
649 }
650
pata_macio_bmdma_status(struct ata_port * ap)651 static u8 pata_macio_bmdma_status(struct ata_port *ap)
652 {
653 struct pata_macio_priv *priv = ap->private_data;
654 struct dbdma_regs __iomem *dma_regs = ap->ioaddr.bmdma_addr;
655 u32 dstat, rstat = ATA_DMA_INTR;
656 unsigned long timeout = 0;
657
658 dstat = readl(&dma_regs->status);
659
660 dev_dbgdma(priv->dev, "%s: dstat=%x\n", __func__, dstat);
661
662 /* We have two things to deal with here:
663 *
664 * - The dbdma won't stop if the command was started
665 * but completed with an error without transferring all
666 * datas. This happens when bad blocks are met during
667 * a multi-block transfer.
668 *
669 * - The dbdma fifo hasn't yet finished flushing to
670 * system memory when the disk interrupt occurs.
671 */
672
673 /* First check for errors */
674 if ((dstat & (RUN|DEAD)) != RUN)
675 rstat |= ATA_DMA_ERR;
676
677 /* If ACTIVE is cleared, the STOP command has been hit and
678 * the transfer is complete. If not, we have to flush the
679 * channel.
680 */
681 if ((dstat & ACTIVE) == 0)
682 return rstat;
683
684 dev_dbgdma(priv->dev, "%s: DMA still active, flushing...\n", __func__);
685
686 /* If dbdma didn't execute the STOP command yet, the
687 * active bit is still set. We consider that we aren't
688 * sharing interrupts (which is hopefully the case with
689 * those controllers) and so we just try to flush the
690 * channel for pending data in the fifo
691 */
692 udelay(1);
693 writel((FLUSH << 16) | FLUSH, &dma_regs->control);
694 for (;;) {
695 udelay(1);
696 dstat = readl(&dma_regs->status);
697 if ((dstat & FLUSH) == 0)
698 break;
699 if (++timeout > 1000) {
700 dev_warn(priv->dev, "timeout flushing DMA\n");
701 rstat |= ATA_DMA_ERR;
702 break;
703 }
704 }
705 return rstat;
706 }
707
708 /* port_start is when we allocate the DMA command list */
pata_macio_port_start(struct ata_port * ap)709 static int pata_macio_port_start(struct ata_port *ap)
710 {
711 struct pata_macio_priv *priv = ap->private_data;
712
713 if (ap->ioaddr.bmdma_addr == NULL)
714 return 0;
715
716 /* Allocate space for the DBDMA commands.
717 *
718 * The +2 is +1 for the stop command and +1 to allow for
719 * aligning the start address to a multiple of 16 bytes.
720 */
721 priv->dma_table_cpu =
722 dmam_alloc_coherent(priv->dev,
723 (MAX_DCMDS + 2) * sizeof(struct dbdma_cmd),
724 &priv->dma_table_dma, GFP_KERNEL);
725 if (priv->dma_table_cpu == NULL) {
726 dev_err(priv->dev, "Unable to allocate DMA command list\n");
727 ap->ioaddr.bmdma_addr = NULL;
728 ap->mwdma_mask = 0;
729 ap->udma_mask = 0;
730 }
731 return 0;
732 }
733
pata_macio_irq_clear(struct ata_port * ap)734 static void pata_macio_irq_clear(struct ata_port *ap)
735 {
736 struct pata_macio_priv *priv = ap->private_data;
737
738 /* Nothing to do here */
739
740 dev_dbgdma(priv->dev, "%s\n", __func__);
741 }
742
pata_macio_reset_hw(struct pata_macio_priv * priv,int resume)743 static void pata_macio_reset_hw(struct pata_macio_priv *priv, int resume)
744 {
745 dev_dbg(priv->dev, "Enabling & resetting... \n");
746
747 if (priv->mediabay)
748 return;
749
750 if (priv->kind == controller_ohare && !resume) {
751 /* The code below is having trouble on some ohare machines
752 * (timing related ?). Until I can put my hand on one of these
753 * units, I keep the old way
754 */
755 ppc_md.feature_call(PMAC_FTR_IDE_ENABLE, priv->node, 0, 1);
756 } else {
757 int rc;
758
759 /* Reset and enable controller */
760 rc = ppc_md.feature_call(PMAC_FTR_IDE_RESET,
761 priv->node, priv->aapl_bus_id, 1);
762 ppc_md.feature_call(PMAC_FTR_IDE_ENABLE,
763 priv->node, priv->aapl_bus_id, 1);
764 msleep(10);
765 /* Only bother waiting if there's a reset control */
766 if (rc == 0) {
767 ppc_md.feature_call(PMAC_FTR_IDE_RESET,
768 priv->node, priv->aapl_bus_id, 0);
769 msleep(IDE_WAKEUP_DELAY_MS);
770 }
771 }
772
773 /* If resuming a PCI device, restore the config space here */
774 if (priv->pdev && resume) {
775 int rc;
776
777 pci_restore_state(priv->pdev);
778 rc = pcim_enable_device(priv->pdev);
779 if (rc)
780 dev_err(&priv->pdev->dev,
781 "Failed to enable device after resume (%d)\n",
782 rc);
783 else
784 pci_set_master(priv->pdev);
785 }
786
787 /* On Kauai, initialize the FCR. We don't perform a reset, doesn't really
788 * seem necessary and speeds up the boot process
789 */
790 if (priv->kauai_fcr)
791 writel(KAUAI_FCR_UATA_MAGIC |
792 KAUAI_FCR_UATA_RESET_N |
793 KAUAI_FCR_UATA_ENABLE, priv->kauai_fcr);
794 }
795
796 /* Hook the standard slave config to fixup some HW related alignment
797 * restrictions
798 */
pata_macio_slave_config(struct scsi_device * sdev)799 static int pata_macio_slave_config(struct scsi_device *sdev)
800 {
801 struct ata_port *ap = ata_shost_to_port(sdev->host);
802 struct pata_macio_priv *priv = ap->private_data;
803 struct ata_device *dev;
804 u16 cmd;
805 int rc;
806
807 /* First call original */
808 rc = ata_scsi_slave_config(sdev);
809 if (rc)
810 return rc;
811
812 /* This is lifted from sata_nv */
813 dev = &ap->link.device[sdev->id];
814
815 /* OHare has issues with non cache aligned DMA on some chipsets */
816 if (priv->kind == controller_ohare) {
817 blk_queue_update_dma_alignment(sdev->request_queue, 31);
818 blk_queue_update_dma_pad(sdev->request_queue, 31);
819
820 /* Tell the world about it */
821 ata_dev_info(dev, "OHare alignment limits applied\n");
822 return 0;
823 }
824
825 /* We only have issues with ATAPI */
826 if (dev->class != ATA_DEV_ATAPI)
827 return 0;
828
829 /* Shasta and K2 seem to have "issues" with reads ... */
830 if (priv->kind == controller_sh_ata6 || priv->kind == controller_k2_ata6) {
831 /* Allright these are bad, apply restrictions */
832 blk_queue_update_dma_alignment(sdev->request_queue, 15);
833 blk_queue_update_dma_pad(sdev->request_queue, 15);
834
835 /* We enable MWI and hack cache line size directly here, this
836 * is specific to this chipset and not normal values, we happen
837 * to somewhat know what we are doing here (which is basically
838 * to do the same Apple does and pray they did not get it wrong :-)
839 */
840 BUG_ON(!priv->pdev);
841 pci_write_config_byte(priv->pdev, PCI_CACHE_LINE_SIZE, 0x08);
842 pci_read_config_word(priv->pdev, PCI_COMMAND, &cmd);
843 pci_write_config_word(priv->pdev, PCI_COMMAND,
844 cmd | PCI_COMMAND_INVALIDATE);
845
846 /* Tell the world about it */
847 ata_dev_info(dev, "K2/Shasta alignment limits applied\n");
848 }
849
850 return 0;
851 }
852
853 #ifdef CONFIG_PM_SLEEP
pata_macio_do_suspend(struct pata_macio_priv * priv,pm_message_t mesg)854 static int pata_macio_do_suspend(struct pata_macio_priv *priv, pm_message_t mesg)
855 {
856 /* First, core libata suspend to do most of the work */
857 ata_host_suspend(priv->host, mesg);
858
859 /* Restore to default timings */
860 pata_macio_default_timings(priv);
861
862 /* Mask interrupt. Not strictly necessary but old driver did
863 * it and I'd rather not change that here */
864 disable_irq(priv->irq);
865
866 /* The media bay will handle itself just fine */
867 if (priv->mediabay)
868 return 0;
869
870 /* Kauai has bus control FCRs directly here */
871 if (priv->kauai_fcr) {
872 u32 fcr = readl(priv->kauai_fcr);
873 fcr &= ~(KAUAI_FCR_UATA_RESET_N | KAUAI_FCR_UATA_ENABLE);
874 writel(fcr, priv->kauai_fcr);
875 }
876
877 /* For PCI, save state and disable DMA. No need to call
878 * pci_set_power_state(), the HW doesn't do D states that
879 * way, the platform code will take care of suspending the
880 * ASIC properly
881 */
882 if (priv->pdev) {
883 pci_save_state(priv->pdev);
884 pci_disable_device(priv->pdev);
885 }
886
887 /* Disable the bus on older machines and the cell on kauai */
888 ppc_md.feature_call(PMAC_FTR_IDE_ENABLE, priv->node,
889 priv->aapl_bus_id, 0);
890
891 return 0;
892 }
893
pata_macio_do_resume(struct pata_macio_priv * priv)894 static int pata_macio_do_resume(struct pata_macio_priv *priv)
895 {
896 /* Reset and re-enable the HW */
897 pata_macio_reset_hw(priv, 1);
898
899 /* Sanitize drive timings */
900 pata_macio_apply_timings(priv->host->ports[0], 0);
901
902 /* We want our IRQ back ! */
903 enable_irq(priv->irq);
904
905 /* Let the libata core take it from there */
906 ata_host_resume(priv->host);
907
908 return 0;
909 }
910 #endif /* CONFIG_PM_SLEEP */
911
912 static const struct scsi_host_template pata_macio_sht = {
913 __ATA_BASE_SHT(DRV_NAME),
914 .sg_tablesize = MAX_DCMDS,
915 /* We may not need that strict one */
916 .dma_boundary = ATA_DMA_BOUNDARY,
917 /* Not sure what the real max is but we know it's less than 64K, let's
918 * use 64K minus 256
919 */
920 .max_segment_size = MAX_DBDMA_SEG,
921 .slave_configure = pata_macio_slave_config,
922 .sdev_groups = ata_common_sdev_groups,
923 .can_queue = ATA_DEF_QUEUE,
924 .tag_alloc_policy = BLK_TAG_ALLOC_RR,
925 };
926
927 static struct ata_port_operations pata_macio_ops = {
928 .inherits = &ata_bmdma_port_ops,
929
930 .freeze = pata_macio_freeze,
931 .set_piomode = pata_macio_set_timings,
932 .set_dmamode = pata_macio_set_timings,
933 .cable_detect = pata_macio_cable_detect,
934 .sff_dev_select = pata_macio_dev_select,
935 .qc_prep = pata_macio_qc_prep,
936 .bmdma_setup = pata_macio_bmdma_setup,
937 .bmdma_start = pata_macio_bmdma_start,
938 .bmdma_stop = pata_macio_bmdma_stop,
939 .bmdma_status = pata_macio_bmdma_status,
940 .port_start = pata_macio_port_start,
941 .sff_irq_clear = pata_macio_irq_clear,
942 };
943
pata_macio_invariants(struct pata_macio_priv * priv)944 static void pata_macio_invariants(struct pata_macio_priv *priv)
945 {
946 const int *bidp;
947
948 /* Identify the type of controller */
949 if (of_device_is_compatible(priv->node, "shasta-ata")) {
950 priv->kind = controller_sh_ata6;
951 priv->timings = pata_macio_shasta_timings;
952 } else if (of_device_is_compatible(priv->node, "kauai-ata")) {
953 priv->kind = controller_un_ata6;
954 priv->timings = pata_macio_kauai_timings;
955 } else if (of_device_is_compatible(priv->node, "K2-UATA")) {
956 priv->kind = controller_k2_ata6;
957 priv->timings = pata_macio_kauai_timings;
958 } else if (of_device_is_compatible(priv->node, "keylargo-ata")) {
959 if (of_node_name_eq(priv->node, "ata-4")) {
960 priv->kind = controller_kl_ata4;
961 priv->timings = pata_macio_kl66_timings;
962 } else {
963 priv->kind = controller_kl_ata3;
964 priv->timings = pata_macio_kl33_timings;
965 }
966 } else if (of_device_is_compatible(priv->node, "heathrow-ata")) {
967 priv->kind = controller_heathrow;
968 priv->timings = pata_macio_heathrow_timings;
969 } else {
970 priv->kind = controller_ohare;
971 priv->timings = pata_macio_ohare_timings;
972 }
973
974 /* XXX FIXME --- setup priv->mediabay here */
975
976 /* Get Apple bus ID (for clock and ASIC control) */
977 bidp = of_get_property(priv->node, "AAPL,bus-id", NULL);
978 priv->aapl_bus_id = bidp ? *bidp : 0;
979
980 /* Fixup missing Apple bus ID in case of media-bay */
981 if (priv->mediabay && !bidp)
982 priv->aapl_bus_id = 1;
983 }
984
pata_macio_setup_ios(struct ata_ioports * ioaddr,void __iomem * base,void __iomem * dma)985 static void pata_macio_setup_ios(struct ata_ioports *ioaddr,
986 void __iomem * base, void __iomem * dma)
987 {
988 /* cmd_addr is the base of regs for that port */
989 ioaddr->cmd_addr = base;
990
991 /* taskfile registers */
992 ioaddr->data_addr = base + (ATA_REG_DATA << 4);
993 ioaddr->error_addr = base + (ATA_REG_ERR << 4);
994 ioaddr->feature_addr = base + (ATA_REG_FEATURE << 4);
995 ioaddr->nsect_addr = base + (ATA_REG_NSECT << 4);
996 ioaddr->lbal_addr = base + (ATA_REG_LBAL << 4);
997 ioaddr->lbam_addr = base + (ATA_REG_LBAM << 4);
998 ioaddr->lbah_addr = base + (ATA_REG_LBAH << 4);
999 ioaddr->device_addr = base + (ATA_REG_DEVICE << 4);
1000 ioaddr->status_addr = base + (ATA_REG_STATUS << 4);
1001 ioaddr->command_addr = base + (ATA_REG_CMD << 4);
1002 ioaddr->altstatus_addr = base + 0x160;
1003 ioaddr->ctl_addr = base + 0x160;
1004 ioaddr->bmdma_addr = dma;
1005 }
1006
pmac_macio_calc_timing_masks(struct pata_macio_priv * priv,struct ata_port_info * pinfo)1007 static void pmac_macio_calc_timing_masks(struct pata_macio_priv *priv,
1008 struct ata_port_info *pinfo)
1009 {
1010 int i = 0;
1011
1012 pinfo->pio_mask = 0;
1013 pinfo->mwdma_mask = 0;
1014 pinfo->udma_mask = 0;
1015
1016 while (priv->timings[i].mode > 0) {
1017 unsigned int mask = 1U << (priv->timings[i].mode & 0x0f);
1018 switch(priv->timings[i].mode & 0xf0) {
1019 case 0x00: /* PIO */
1020 pinfo->pio_mask |= (mask >> 8);
1021 break;
1022 case 0x20: /* MWDMA */
1023 pinfo->mwdma_mask |= mask;
1024 break;
1025 case 0x40: /* UDMA */
1026 pinfo->udma_mask |= mask;
1027 break;
1028 }
1029 i++;
1030 }
1031 dev_dbg(priv->dev, "Supported masks: PIO=%x, MWDMA=%x, UDMA=%x\n",
1032 pinfo->pio_mask, pinfo->mwdma_mask, pinfo->udma_mask);
1033 }
1034
pata_macio_common_init(struct pata_macio_priv * priv,resource_size_t tfregs,resource_size_t dmaregs,resource_size_t fcregs,unsigned long irq)1035 static int pata_macio_common_init(struct pata_macio_priv *priv,
1036 resource_size_t tfregs,
1037 resource_size_t dmaregs,
1038 resource_size_t fcregs,
1039 unsigned long irq)
1040 {
1041 struct ata_port_info pinfo;
1042 const struct ata_port_info *ppi[] = { &pinfo, NULL };
1043 void __iomem *dma_regs = NULL;
1044
1045 /* Fill up privates with various invariants collected from the
1046 * device-tree
1047 */
1048 pata_macio_invariants(priv);
1049
1050 /* Make sure we have sane initial timings in the cache */
1051 pata_macio_default_timings(priv);
1052
1053 /* Allocate libata host for 1 port */
1054 memset(&pinfo, 0, sizeof(struct ata_port_info));
1055 pmac_macio_calc_timing_masks(priv, &pinfo);
1056 pinfo.flags = ATA_FLAG_SLAVE_POSS;
1057 pinfo.port_ops = &pata_macio_ops;
1058 pinfo.private_data = priv;
1059
1060 priv->host = ata_host_alloc_pinfo(priv->dev, ppi, 1);
1061 if (priv->host == NULL) {
1062 dev_err(priv->dev, "Failed to allocate ATA port structure\n");
1063 return -ENOMEM;
1064 }
1065
1066 /* Setup the private data in host too */
1067 priv->host->private_data = priv;
1068
1069 /* Map base registers */
1070 priv->tfregs = devm_ioremap(priv->dev, tfregs, 0x100);
1071 if (priv->tfregs == NULL) {
1072 dev_err(priv->dev, "Failed to map ATA ports\n");
1073 return -ENOMEM;
1074 }
1075 priv->host->iomap = &priv->tfregs;
1076
1077 /* Map DMA regs */
1078 if (dmaregs != 0) {
1079 dma_regs = devm_ioremap(priv->dev, dmaregs,
1080 sizeof(struct dbdma_regs));
1081 if (dma_regs == NULL)
1082 dev_warn(priv->dev, "Failed to map ATA DMA registers\n");
1083 }
1084
1085 /* If chip has local feature control, map those regs too */
1086 if (fcregs != 0) {
1087 priv->kauai_fcr = devm_ioremap(priv->dev, fcregs, 4);
1088 if (priv->kauai_fcr == NULL) {
1089 dev_err(priv->dev, "Failed to map ATA FCR register\n");
1090 return -ENOMEM;
1091 }
1092 }
1093
1094 /* Setup port data structure */
1095 pata_macio_setup_ios(&priv->host->ports[0]->ioaddr,
1096 priv->tfregs, dma_regs);
1097 priv->host->ports[0]->private_data = priv;
1098
1099 /* hard-reset the controller */
1100 pata_macio_reset_hw(priv, 0);
1101 pata_macio_apply_timings(priv->host->ports[0], 0);
1102
1103 /* Enable bus master if necessary */
1104 if (priv->pdev && dma_regs)
1105 pci_set_master(priv->pdev);
1106
1107 dev_info(priv->dev, "Activating pata-macio chipset %s, Apple bus ID %d\n",
1108 macio_ata_names[priv->kind], priv->aapl_bus_id);
1109
1110 /* Start it up */
1111 priv->irq = irq;
1112 return ata_host_activate(priv->host, irq, ata_bmdma_interrupt, 0,
1113 &pata_macio_sht);
1114 }
1115
pata_macio_attach(struct macio_dev * mdev,const struct of_device_id * match)1116 static int pata_macio_attach(struct macio_dev *mdev,
1117 const struct of_device_id *match)
1118 {
1119 struct pata_macio_priv *priv;
1120 resource_size_t tfregs, dmaregs = 0;
1121 unsigned long irq;
1122 int rc;
1123
1124 /* Check for broken device-trees */
1125 if (macio_resource_count(mdev) == 0) {
1126 dev_err(&mdev->ofdev.dev,
1127 "No addresses for controller\n");
1128 return -ENXIO;
1129 }
1130
1131 /* Enable managed resources */
1132 macio_enable_devres(mdev);
1133
1134 /* Allocate and init private data structure */
1135 priv = devm_kzalloc(&mdev->ofdev.dev,
1136 sizeof(struct pata_macio_priv), GFP_KERNEL);
1137 if (!priv)
1138 return -ENOMEM;
1139
1140 priv->node = of_node_get(mdev->ofdev.dev.of_node);
1141 priv->mdev = mdev;
1142 priv->dev = &mdev->ofdev.dev;
1143
1144 /* Request memory resource for taskfile registers */
1145 if (macio_request_resource(mdev, 0, "pata-macio")) {
1146 dev_err(&mdev->ofdev.dev,
1147 "Cannot obtain taskfile resource\n");
1148 return -EBUSY;
1149 }
1150 tfregs = macio_resource_start(mdev, 0);
1151
1152 /* Request resources for DMA registers if any */
1153 if (macio_resource_count(mdev) >= 2) {
1154 if (macio_request_resource(mdev, 1, "pata-macio-dma"))
1155 dev_err(&mdev->ofdev.dev,
1156 "Cannot obtain DMA resource\n");
1157 else
1158 dmaregs = macio_resource_start(mdev, 1);
1159 }
1160
1161 /*
1162 * Fixup missing IRQ for some old implementations with broken
1163 * device-trees.
1164 *
1165 * This is a bit bogus, it should be fixed in the device-tree itself,
1166 * via the existing macio fixups, based on the type of interrupt
1167 * controller in the machine. However, I have no test HW for this case,
1168 * and this trick works well enough on those old machines...
1169 */
1170 if (macio_irq_count(mdev) == 0) {
1171 dev_warn(&mdev->ofdev.dev,
1172 "No interrupts for controller, using 13\n");
1173 irq = irq_create_mapping(NULL, 13);
1174 } else
1175 irq = macio_irq(mdev, 0);
1176
1177 /* Prevvent media bay callbacks until fully registered */
1178 lock_media_bay(priv->mdev->media_bay);
1179
1180 /* Get register addresses and call common initialization */
1181 rc = pata_macio_common_init(priv,
1182 tfregs, /* Taskfile regs */
1183 dmaregs, /* DBDMA regs */
1184 0, /* Feature control */
1185 irq);
1186 unlock_media_bay(priv->mdev->media_bay);
1187
1188 return rc;
1189 }
1190
pata_macio_detach(struct macio_dev * mdev)1191 static int pata_macio_detach(struct macio_dev *mdev)
1192 {
1193 struct ata_host *host = macio_get_drvdata(mdev);
1194 struct pata_macio_priv *priv = host->private_data;
1195
1196 lock_media_bay(priv->mdev->media_bay);
1197
1198 /* Make sure the mediabay callback doesn't try to access
1199 * dead stuff
1200 */
1201 priv->host->private_data = NULL;
1202
1203 ata_host_detach(host);
1204
1205 unlock_media_bay(priv->mdev->media_bay);
1206
1207 return 0;
1208 }
1209
1210 #ifdef CONFIG_PM_SLEEP
pata_macio_suspend(struct macio_dev * mdev,pm_message_t mesg)1211 static int pata_macio_suspend(struct macio_dev *mdev, pm_message_t mesg)
1212 {
1213 struct ata_host *host = macio_get_drvdata(mdev);
1214
1215 return pata_macio_do_suspend(host->private_data, mesg);
1216 }
1217
pata_macio_resume(struct macio_dev * mdev)1218 static int pata_macio_resume(struct macio_dev *mdev)
1219 {
1220 struct ata_host *host = macio_get_drvdata(mdev);
1221
1222 return pata_macio_do_resume(host->private_data);
1223 }
1224 #endif /* CONFIG_PM_SLEEP */
1225
1226 #ifdef CONFIG_PMAC_MEDIABAY
pata_macio_mb_event(struct macio_dev * mdev,int mb_state)1227 static void pata_macio_mb_event(struct macio_dev* mdev, int mb_state)
1228 {
1229 struct ata_host *host = macio_get_drvdata(mdev);
1230 struct ata_port *ap;
1231 struct ata_eh_info *ehi;
1232 struct ata_device *dev;
1233 unsigned long flags;
1234
1235 if (!host || !host->private_data)
1236 return;
1237 ap = host->ports[0];
1238 spin_lock_irqsave(ap->lock, flags);
1239 ehi = &ap->link.eh_info;
1240 if (mb_state == MB_CD) {
1241 ata_ehi_push_desc(ehi, "mediabay plug");
1242 ata_ehi_hotplugged(ehi);
1243 ata_port_freeze(ap);
1244 } else {
1245 ata_ehi_push_desc(ehi, "mediabay unplug");
1246 ata_for_each_dev(dev, &ap->link, ALL)
1247 dev->flags |= ATA_DFLAG_DETACH;
1248 ata_port_abort(ap);
1249 }
1250 spin_unlock_irqrestore(ap->lock, flags);
1251
1252 }
1253 #endif /* CONFIG_PMAC_MEDIABAY */
1254
1255
pata_macio_pci_attach(struct pci_dev * pdev,const struct pci_device_id * id)1256 static int pata_macio_pci_attach(struct pci_dev *pdev,
1257 const struct pci_device_id *id)
1258 {
1259 struct pata_macio_priv *priv;
1260 struct device_node *np;
1261 resource_size_t rbase;
1262
1263 /* We cannot use a MacIO controller without its OF device node */
1264 np = pci_device_to_OF_node(pdev);
1265 if (np == NULL) {
1266 dev_err(&pdev->dev,
1267 "Cannot find OF device node for controller\n");
1268 return -ENODEV;
1269 }
1270
1271 /* Check that it can be enabled */
1272 if (pcim_enable_device(pdev)) {
1273 dev_err(&pdev->dev,
1274 "Cannot enable controller PCI device\n");
1275 return -ENXIO;
1276 }
1277
1278 /* Allocate and init private data structure */
1279 priv = devm_kzalloc(&pdev->dev,
1280 sizeof(struct pata_macio_priv), GFP_KERNEL);
1281 if (!priv)
1282 return -ENOMEM;
1283
1284 priv->node = of_node_get(np);
1285 priv->pdev = pdev;
1286 priv->dev = &pdev->dev;
1287
1288 /* Get MMIO regions */
1289 if (pci_request_regions(pdev, "pata-macio")) {
1290 dev_err(&pdev->dev,
1291 "Cannot obtain PCI resources\n");
1292 return -EBUSY;
1293 }
1294
1295 /* Get register addresses and call common initialization */
1296 rbase = pci_resource_start(pdev, 0);
1297 if (pata_macio_common_init(priv,
1298 rbase + 0x2000, /* Taskfile regs */
1299 rbase + 0x1000, /* DBDMA regs */
1300 rbase, /* Feature control */
1301 pdev->irq))
1302 return -ENXIO;
1303
1304 return 0;
1305 }
1306
pata_macio_pci_detach(struct pci_dev * pdev)1307 static void pata_macio_pci_detach(struct pci_dev *pdev)
1308 {
1309 struct ata_host *host = pci_get_drvdata(pdev);
1310
1311 ata_host_detach(host);
1312 }
1313
1314 #ifdef CONFIG_PM_SLEEP
pata_macio_pci_suspend(struct pci_dev * pdev,pm_message_t mesg)1315 static int pata_macio_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
1316 {
1317 struct ata_host *host = pci_get_drvdata(pdev);
1318
1319 return pata_macio_do_suspend(host->private_data, mesg);
1320 }
1321
pata_macio_pci_resume(struct pci_dev * pdev)1322 static int pata_macio_pci_resume(struct pci_dev *pdev)
1323 {
1324 struct ata_host *host = pci_get_drvdata(pdev);
1325
1326 return pata_macio_do_resume(host->private_data);
1327 }
1328 #endif /* CONFIG_PM_SLEEP */
1329
1330 static const struct of_device_id pata_macio_match[] =
1331 {
1332 { .name = "IDE", },
1333 { .name = "ATA", },
1334 { .type = "ide", },
1335 { .type = "ata", },
1336 { /* sentinel */ }
1337 };
1338 MODULE_DEVICE_TABLE(of, pata_macio_match);
1339
1340 static struct macio_driver pata_macio_driver =
1341 {
1342 .driver = {
1343 .name = "pata-macio",
1344 .owner = THIS_MODULE,
1345 .of_match_table = pata_macio_match,
1346 },
1347 .probe = pata_macio_attach,
1348 .remove = pata_macio_detach,
1349 #ifdef CONFIG_PM_SLEEP
1350 .suspend = pata_macio_suspend,
1351 .resume = pata_macio_resume,
1352 #endif
1353 #ifdef CONFIG_PMAC_MEDIABAY
1354 .mediabay_event = pata_macio_mb_event,
1355 #endif
1356 };
1357
1358 static const struct pci_device_id pata_macio_pci_match[] = {
1359 { PCI_VDEVICE(APPLE, PCI_DEVICE_ID_APPLE_UNI_N_ATA), 0 },
1360 { PCI_VDEVICE(APPLE, PCI_DEVICE_ID_APPLE_IPID_ATA100), 0 },
1361 { PCI_VDEVICE(APPLE, PCI_DEVICE_ID_APPLE_K2_ATA100), 0 },
1362 { PCI_VDEVICE(APPLE, PCI_DEVICE_ID_APPLE_SH_ATA), 0 },
1363 { PCI_VDEVICE(APPLE, PCI_DEVICE_ID_APPLE_IPID2_ATA), 0 },
1364 {},
1365 };
1366
1367 static struct pci_driver pata_macio_pci_driver = {
1368 .name = "pata-pci-macio",
1369 .id_table = pata_macio_pci_match,
1370 .probe = pata_macio_pci_attach,
1371 .remove = pata_macio_pci_detach,
1372 #ifdef CONFIG_PM_SLEEP
1373 .suspend = pata_macio_pci_suspend,
1374 .resume = pata_macio_pci_resume,
1375 #endif
1376 .driver = {
1377 .owner = THIS_MODULE,
1378 },
1379 };
1380 MODULE_DEVICE_TABLE(pci, pata_macio_pci_match);
1381
1382
pata_macio_init(void)1383 static int __init pata_macio_init(void)
1384 {
1385 int rc;
1386
1387 if (!machine_is(powermac))
1388 return -ENODEV;
1389
1390 rc = pci_register_driver(&pata_macio_pci_driver);
1391 if (rc)
1392 return rc;
1393 rc = macio_register_driver(&pata_macio_driver);
1394 if (rc) {
1395 pci_unregister_driver(&pata_macio_pci_driver);
1396 return rc;
1397 }
1398 return 0;
1399 }
1400
pata_macio_exit(void)1401 static void __exit pata_macio_exit(void)
1402 {
1403 macio_unregister_driver(&pata_macio_driver);
1404 pci_unregister_driver(&pata_macio_pci_driver);
1405 }
1406
1407 module_init(pata_macio_init);
1408 module_exit(pata_macio_exit);
1409
1410 MODULE_AUTHOR("Benjamin Herrenschmidt");
1411 MODULE_DESCRIPTION("Apple MacIO PATA driver");
1412 MODULE_LICENSE("GPL");
1413 MODULE_VERSION(DRV_VERSION);
1414