Commit | Line | Data |
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cd9ad58d DM |
1 | /* sun_esp.c: ESP front-end for Sparc SBUS systems. |
2 | * | |
334ae614 | 3 | * Copyright (C) 2007, 2008 David S. Miller (davem@davemloft.net) |
cd9ad58d DM |
4 | */ |
5 | ||
6 | #include <linux/kernel.h> | |
7 | #include <linux/types.h> | |
6025dfe5 | 8 | #include <linux/delay.h> |
cd9ad58d | 9 | #include <linux/module.h> |
27ac792c | 10 | #include <linux/mm.h> |
cd9ad58d | 11 | #include <linux/init.h> |
738f2b7b | 12 | #include <linux/dma-mapping.h> |
05bb5e93 DM |
13 | #include <linux/of.h> |
14 | #include <linux/of_device.h> | |
5a0e3ad6 | 15 | #include <linux/gfp.h> |
cd9ad58d DM |
16 | |
17 | #include <asm/irq.h> | |
18 | #include <asm/io.h> | |
19 | #include <asm/dma.h> | |
20 | ||
cd9ad58d DM |
21 | #include <scsi/scsi_host.h> |
22 | ||
23 | #include "esp_scsi.h" | |
24 | ||
25 | #define DRV_MODULE_NAME "sun_esp" | |
26 | #define PFX DRV_MODULE_NAME ": " | |
05bb5e93 DM |
27 | #define DRV_VERSION "1.100" |
28 | #define DRV_MODULE_RELDATE "August 27, 2008" | |
cd9ad58d DM |
29 | |
30 | #define dma_read32(REG) \ | |
31 | sbus_readl(esp->dma_regs + (REG)) | |
32 | #define dma_write32(VAL, REG) \ | |
33 | sbus_writel((VAL), esp->dma_regs + (REG)) | |
34 | ||
334ae614 DM |
35 | /* DVMA chip revisions */ |
36 | enum dvma_rev { | |
37 | dvmarev0, | |
38 | dvmaesc1, | |
39 | dvmarev1, | |
40 | dvmarev2, | |
41 | dvmarev3, | |
42 | dvmarevplus, | |
43 | dvmahme | |
44 | }; | |
cd9ad58d | 45 | |
6f039790 | 46 | static int esp_sbus_setup_dma(struct esp *esp, struct platform_device *dma_of) |
334ae614 DM |
47 | { |
48 | esp->dma = dma_of; | |
cd9ad58d | 49 | |
334ae614 DM |
50 | esp->dma_regs = of_ioremap(&dma_of->resource[0], 0, |
51 | resource_size(&dma_of->resource[0]), | |
52 | "espdma"); | |
53 | if (!esp->dma_regs) | |
54 | return -ENOMEM; | |
cd9ad58d | 55 | |
334ae614 DM |
56 | switch (dma_read32(DMA_CSR) & DMA_DEVICE_ID) { |
57 | case DMA_VERS0: | |
58 | esp->dmarev = dvmarev0; | |
59 | break; | |
60 | case DMA_ESCV1: | |
61 | esp->dmarev = dvmaesc1; | |
62 | break; | |
63 | case DMA_VERS1: | |
64 | esp->dmarev = dvmarev1; | |
65 | break; | |
66 | case DMA_VERS2: | |
67 | esp->dmarev = dvmarev2; | |
68 | break; | |
69 | case DMA_VERHME: | |
70 | esp->dmarev = dvmahme; | |
71 | break; | |
72 | case DMA_VERSPLUS: | |
73 | esp->dmarev = dvmarevplus; | |
74 | break; | |
cd9ad58d | 75 | } |
cd9ad58d DM |
76 | |
77 | return 0; | |
78 | ||
79 | } | |
80 | ||
6f039790 | 81 | static int esp_sbus_map_regs(struct esp *esp, int hme) |
cd9ad58d | 82 | { |
2dc11581 | 83 | struct platform_device *op = esp->dev; |
cd9ad58d DM |
84 | struct resource *res; |
85 | ||
86 | /* On HME, two reg sets exist, first is DVMA, | |
87 | * second is ESP registers. | |
88 | */ | |
89 | if (hme) | |
05bb5e93 | 90 | res = &op->resource[1]; |
cd9ad58d | 91 | else |
05bb5e93 | 92 | res = &op->resource[0]; |
cd9ad58d | 93 | |
05bb5e93 | 94 | esp->regs = of_ioremap(res, 0, SBUS_ESP_REG_SIZE, "ESP"); |
cd9ad58d DM |
95 | if (!esp->regs) |
96 | return -ENOMEM; | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
6f039790 | 101 | static int esp_sbus_map_command_block(struct esp *esp) |
cd9ad58d | 102 | { |
2dc11581 | 103 | struct platform_device *op = esp->dev; |
cd9ad58d | 104 | |
05bb5e93 | 105 | esp->command_block = dma_alloc_coherent(&op->dev, 16, |
738f2b7b DM |
106 | &esp->command_block_dma, |
107 | GFP_ATOMIC); | |
cd9ad58d DM |
108 | if (!esp->command_block) |
109 | return -ENOMEM; | |
110 | return 0; | |
111 | } | |
112 | ||
6f039790 | 113 | static int esp_sbus_register_irq(struct esp *esp) |
cd9ad58d DM |
114 | { |
115 | struct Scsi_Host *host = esp->host; | |
2dc11581 | 116 | struct platform_device *op = esp->dev; |
cd9ad58d | 117 | |
1636f8ac | 118 | host->irq = op->archdata.irqs[0]; |
cd9ad58d DM |
119 | return request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp); |
120 | } | |
121 | ||
6f039790 | 122 | static void esp_get_scsi_id(struct esp *esp, struct platform_device *espdma) |
cd9ad58d | 123 | { |
2dc11581 | 124 | struct platform_device *op = esp->dev; |
05bb5e93 | 125 | struct device_node *dp; |
cd9ad58d | 126 | |
61c7a080 | 127 | dp = op->dev.of_node; |
cd9ad58d DM |
128 | esp->scsi_id = of_getintprop_default(dp, "initiator-id", 0xff); |
129 | if (esp->scsi_id != 0xff) | |
130 | goto done; | |
131 | ||
132 | esp->scsi_id = of_getintprop_default(dp, "scsi-initiator-id", 0xff); | |
133 | if (esp->scsi_id != 0xff) | |
134 | goto done; | |
135 | ||
61c7a080 | 136 | esp->scsi_id = of_getintprop_default(espdma->dev.of_node, |
cd9ad58d DM |
137 | "scsi-initiator-id", 7); |
138 | ||
139 | done: | |
140 | esp->host->this_id = esp->scsi_id; | |
141 | esp->scsi_id_mask = (1 << esp->scsi_id); | |
142 | } | |
143 | ||
6f039790 | 144 | static void esp_get_differential(struct esp *esp) |
cd9ad58d | 145 | { |
2dc11581 | 146 | struct platform_device *op = esp->dev; |
05bb5e93 | 147 | struct device_node *dp; |
cd9ad58d | 148 | |
61c7a080 | 149 | dp = op->dev.of_node; |
cd9ad58d DM |
150 | if (of_find_property(dp, "differential", NULL)) |
151 | esp->flags |= ESP_FLAG_DIFFERENTIAL; | |
152 | else | |
153 | esp->flags &= ~ESP_FLAG_DIFFERENTIAL; | |
154 | } | |
155 | ||
6f039790 | 156 | static void esp_get_clock_params(struct esp *esp) |
cd9ad58d | 157 | { |
2dc11581 | 158 | struct platform_device *op = esp->dev; |
05bb5e93 | 159 | struct device_node *bus_dp, *dp; |
cd9ad58d DM |
160 | int fmhz; |
161 | ||
61c7a080 | 162 | dp = op->dev.of_node; |
05bb5e93 | 163 | bus_dp = dp->parent; |
cd9ad58d DM |
164 | |
165 | fmhz = of_getintprop_default(dp, "clock-frequency", 0); | |
166 | if (fmhz == 0) | |
05bb5e93 | 167 | fmhz = of_getintprop_default(bus_dp, "clock-frequency", 0); |
cd9ad58d DM |
168 | |
169 | esp->cfreq = fmhz; | |
170 | } | |
171 | ||
6f039790 | 172 | static void esp_get_bursts(struct esp *esp, struct platform_device *dma_of) |
cd9ad58d | 173 | { |
61c7a080 | 174 | struct device_node *dma_dp = dma_of->dev.of_node; |
2dc11581 | 175 | struct platform_device *op = esp->dev; |
334ae614 DM |
176 | struct device_node *dp; |
177 | u8 bursts, val; | |
cd9ad58d | 178 | |
61c7a080 | 179 | dp = op->dev.of_node; |
cd9ad58d | 180 | bursts = of_getintprop_default(dp, "burst-sizes", 0xff); |
334ae614 DM |
181 | val = of_getintprop_default(dma_dp, "burst-sizes", 0xff); |
182 | if (val != 0xff) | |
183 | bursts &= val; | |
cd9ad58d | 184 | |
05bb5e93 DM |
185 | val = of_getintprop_default(dma_dp->parent, "burst-sizes", 0xff); |
186 | if (val != 0xff) | |
187 | bursts &= val; | |
cd9ad58d DM |
188 | |
189 | if (bursts == 0xff || | |
190 | (bursts & DMA_BURST16) == 0 || | |
191 | (bursts & DMA_BURST32) == 0) | |
192 | bursts = (DMA_BURST32 - 1); | |
193 | ||
194 | esp->bursts = bursts; | |
195 | } | |
196 | ||
6f039790 | 197 | static void esp_sbus_get_props(struct esp *esp, struct platform_device *espdma) |
cd9ad58d | 198 | { |
05bb5e93 | 199 | esp_get_scsi_id(esp, espdma); |
cd9ad58d DM |
200 | esp_get_differential(esp); |
201 | esp_get_clock_params(esp); | |
202 | esp_get_bursts(esp, espdma); | |
203 | } | |
204 | ||
205 | static void sbus_esp_write8(struct esp *esp, u8 val, unsigned long reg) | |
206 | { | |
207 | sbus_writeb(val, esp->regs + (reg * 4UL)); | |
208 | } | |
209 | ||
210 | static u8 sbus_esp_read8(struct esp *esp, unsigned long reg) | |
211 | { | |
212 | return sbus_readb(esp->regs + (reg * 4UL)); | |
213 | } | |
214 | ||
215 | static dma_addr_t sbus_esp_map_single(struct esp *esp, void *buf, | |
216 | size_t sz, int dir) | |
217 | { | |
2dc11581 | 218 | struct platform_device *op = esp->dev; |
7a715f46 | 219 | |
05bb5e93 | 220 | return dma_map_single(&op->dev, buf, sz, dir); |
cd9ad58d DM |
221 | } |
222 | ||
223 | static int sbus_esp_map_sg(struct esp *esp, struct scatterlist *sg, | |
224 | int num_sg, int dir) | |
225 | { | |
2dc11581 | 226 | struct platform_device *op = esp->dev; |
7a715f46 | 227 | |
05bb5e93 | 228 | return dma_map_sg(&op->dev, sg, num_sg, dir); |
cd9ad58d DM |
229 | } |
230 | ||
231 | static void sbus_esp_unmap_single(struct esp *esp, dma_addr_t addr, | |
232 | size_t sz, int dir) | |
233 | { | |
2dc11581 | 234 | struct platform_device *op = esp->dev; |
7a715f46 | 235 | |
05bb5e93 | 236 | dma_unmap_single(&op->dev, addr, sz, dir); |
cd9ad58d DM |
237 | } |
238 | ||
239 | static void sbus_esp_unmap_sg(struct esp *esp, struct scatterlist *sg, | |
240 | int num_sg, int dir) | |
241 | { | |
2dc11581 | 242 | struct platform_device *op = esp->dev; |
7a715f46 | 243 | |
05bb5e93 | 244 | dma_unmap_sg(&op->dev, sg, num_sg, dir); |
cd9ad58d DM |
245 | } |
246 | ||
247 | static int sbus_esp_irq_pending(struct esp *esp) | |
248 | { | |
249 | if (dma_read32(DMA_CSR) & (DMA_HNDL_INTR | DMA_HNDL_ERROR)) | |
250 | return 1; | |
251 | return 0; | |
252 | } | |
253 | ||
254 | static void sbus_esp_reset_dma(struct esp *esp) | |
255 | { | |
256 | int can_do_burst16, can_do_burst32, can_do_burst64; | |
257 | int can_do_sbus64, lim; | |
2dc11581 | 258 | struct platform_device *op; |
cd9ad58d DM |
259 | u32 val; |
260 | ||
261 | can_do_burst16 = (esp->bursts & DMA_BURST16) != 0; | |
262 | can_do_burst32 = (esp->bursts & DMA_BURST32) != 0; | |
263 | can_do_burst64 = 0; | |
264 | can_do_sbus64 = 0; | |
05bb5e93 | 265 | op = esp->dev; |
63237eeb | 266 | if (sbus_can_dma_64bit()) |
cd9ad58d | 267 | can_do_sbus64 = 1; |
63237eeb | 268 | if (sbus_can_burst64()) |
cd9ad58d DM |
269 | can_do_burst64 = (esp->bursts & DMA_BURST64) != 0; |
270 | ||
271 | /* Put the DVMA into a known state. */ | |
334ae614 | 272 | if (esp->dmarev != dvmahme) { |
cd9ad58d DM |
273 | val = dma_read32(DMA_CSR); |
274 | dma_write32(val | DMA_RST_SCSI, DMA_CSR); | |
275 | dma_write32(val & ~DMA_RST_SCSI, DMA_CSR); | |
276 | } | |
334ae614 | 277 | switch (esp->dmarev) { |
cd9ad58d DM |
278 | case dvmahme: |
279 | dma_write32(DMA_RESET_FAS366, DMA_CSR); | |
280 | dma_write32(DMA_RST_SCSI, DMA_CSR); | |
281 | ||
282 | esp->prev_hme_dmacsr = (DMA_PARITY_OFF | DMA_2CLKS | | |
283 | DMA_SCSI_DISAB | DMA_INT_ENAB); | |
284 | ||
285 | esp->prev_hme_dmacsr &= ~(DMA_ENABLE | DMA_ST_WRITE | | |
286 | DMA_BRST_SZ); | |
287 | ||
288 | if (can_do_burst64) | |
289 | esp->prev_hme_dmacsr |= DMA_BRST64; | |
290 | else if (can_do_burst32) | |
291 | esp->prev_hme_dmacsr |= DMA_BRST32; | |
292 | ||
293 | if (can_do_sbus64) { | |
294 | esp->prev_hme_dmacsr |= DMA_SCSI_SBUS64; | |
05bb5e93 | 295 | sbus_set_sbus64(&op->dev, esp->bursts); |
cd9ad58d DM |
296 | } |
297 | ||
298 | lim = 1000; | |
299 | while (dma_read32(DMA_CSR) & DMA_PEND_READ) { | |
300 | if (--lim == 0) { | |
301 | printk(KERN_ALERT PFX "esp%d: DMA_PEND_READ " | |
302 | "will not clear!\n", | |
303 | esp->host->unique_id); | |
304 | break; | |
305 | } | |
306 | udelay(1); | |
307 | } | |
308 | ||
309 | dma_write32(0, DMA_CSR); | |
310 | dma_write32(esp->prev_hme_dmacsr, DMA_CSR); | |
311 | ||
312 | dma_write32(0, DMA_ADDR); | |
313 | break; | |
314 | ||
315 | case dvmarev2: | |
316 | if (esp->rev != ESP100) { | |
317 | val = dma_read32(DMA_CSR); | |
318 | dma_write32(val | DMA_3CLKS, DMA_CSR); | |
319 | } | |
320 | break; | |
321 | ||
322 | case dvmarev3: | |
323 | val = dma_read32(DMA_CSR); | |
324 | val &= ~DMA_3CLKS; | |
325 | val |= DMA_2CLKS; | |
326 | if (can_do_burst32) { | |
327 | val &= ~DMA_BRST_SZ; | |
328 | val |= DMA_BRST32; | |
329 | } | |
330 | dma_write32(val, DMA_CSR); | |
331 | break; | |
332 | ||
333 | case dvmaesc1: | |
334 | val = dma_read32(DMA_CSR); | |
335 | val |= DMA_ADD_ENABLE; | |
336 | val &= ~DMA_BCNT_ENAB; | |
337 | if (!can_do_burst32 && can_do_burst16) { | |
338 | val |= DMA_ESC_BURST; | |
339 | } else { | |
340 | val &= ~(DMA_ESC_BURST); | |
341 | } | |
342 | dma_write32(val, DMA_CSR); | |
343 | break; | |
344 | ||
345 | default: | |
346 | break; | |
347 | } | |
348 | ||
349 | /* Enable interrupts. */ | |
350 | val = dma_read32(DMA_CSR); | |
351 | dma_write32(val | DMA_INT_ENAB, DMA_CSR); | |
352 | } | |
353 | ||
354 | static void sbus_esp_dma_drain(struct esp *esp) | |
355 | { | |
356 | u32 csr; | |
357 | int lim; | |
358 | ||
334ae614 | 359 | if (esp->dmarev == dvmahme) |
cd9ad58d DM |
360 | return; |
361 | ||
362 | csr = dma_read32(DMA_CSR); | |
363 | if (!(csr & DMA_FIFO_ISDRAIN)) | |
364 | return; | |
365 | ||
334ae614 | 366 | if (esp->dmarev != dvmarev3 && esp->dmarev != dvmaesc1) |
cd9ad58d DM |
367 | dma_write32(csr | DMA_FIFO_STDRAIN, DMA_CSR); |
368 | ||
369 | lim = 1000; | |
370 | while (dma_read32(DMA_CSR) & DMA_FIFO_ISDRAIN) { | |
371 | if (--lim == 0) { | |
372 | printk(KERN_ALERT PFX "esp%d: DMA will not drain!\n", | |
373 | esp->host->unique_id); | |
374 | break; | |
375 | } | |
376 | udelay(1); | |
377 | } | |
378 | } | |
379 | ||
380 | static void sbus_esp_dma_invalidate(struct esp *esp) | |
381 | { | |
334ae614 | 382 | if (esp->dmarev == dvmahme) { |
cd9ad58d DM |
383 | dma_write32(DMA_RST_SCSI, DMA_CSR); |
384 | ||
385 | esp->prev_hme_dmacsr = ((esp->prev_hme_dmacsr | | |
386 | (DMA_PARITY_OFF | DMA_2CLKS | | |
387 | DMA_SCSI_DISAB | DMA_INT_ENAB)) & | |
388 | ~(DMA_ST_WRITE | DMA_ENABLE)); | |
389 | ||
390 | dma_write32(0, DMA_CSR); | |
391 | dma_write32(esp->prev_hme_dmacsr, DMA_CSR); | |
392 | ||
393 | /* This is necessary to avoid having the SCSI channel | |
394 | * engine lock up on us. | |
395 | */ | |
396 | dma_write32(0, DMA_ADDR); | |
397 | } else { | |
398 | u32 val; | |
399 | int lim; | |
400 | ||
401 | lim = 1000; | |
402 | while ((val = dma_read32(DMA_CSR)) & DMA_PEND_READ) { | |
403 | if (--lim == 0) { | |
404 | printk(KERN_ALERT PFX "esp%d: DMA will not " | |
405 | "invalidate!\n", esp->host->unique_id); | |
406 | break; | |
407 | } | |
408 | udelay(1); | |
409 | } | |
410 | ||
411 | val &= ~(DMA_ENABLE | DMA_ST_WRITE | DMA_BCNT_ENAB); | |
412 | val |= DMA_FIFO_INV; | |
413 | dma_write32(val, DMA_CSR); | |
414 | val &= ~DMA_FIFO_INV; | |
415 | dma_write32(val, DMA_CSR); | |
416 | } | |
417 | } | |
418 | ||
419 | static void sbus_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count, | |
420 | u32 dma_count, int write, u8 cmd) | |
421 | { | |
422 | u32 csr; | |
423 | ||
424 | BUG_ON(!(cmd & ESP_CMD_DMA)); | |
425 | ||
426 | sbus_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW); | |
427 | sbus_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED); | |
428 | if (esp->rev == FASHME) { | |
429 | sbus_esp_write8(esp, (esp_count >> 16) & 0xff, FAS_RLO); | |
430 | sbus_esp_write8(esp, 0, FAS_RHI); | |
431 | ||
432 | scsi_esp_cmd(esp, cmd); | |
433 | ||
434 | csr = esp->prev_hme_dmacsr; | |
435 | csr |= DMA_SCSI_DISAB | DMA_ENABLE; | |
436 | if (write) | |
437 | csr |= DMA_ST_WRITE; | |
438 | else | |
439 | csr &= ~DMA_ST_WRITE; | |
440 | esp->prev_hme_dmacsr = csr; | |
441 | ||
442 | dma_write32(dma_count, DMA_COUNT); | |
443 | dma_write32(addr, DMA_ADDR); | |
444 | dma_write32(csr, DMA_CSR); | |
445 | } else { | |
446 | csr = dma_read32(DMA_CSR); | |
447 | csr |= DMA_ENABLE; | |
448 | if (write) | |
449 | csr |= DMA_ST_WRITE; | |
450 | else | |
451 | csr &= ~DMA_ST_WRITE; | |
452 | dma_write32(csr, DMA_CSR); | |
334ae614 | 453 | if (esp->dmarev == dvmaesc1) { |
cd9ad58d DM |
454 | u32 end = PAGE_ALIGN(addr + dma_count + 16U); |
455 | dma_write32(end - addr, DMA_COUNT); | |
456 | } | |
457 | dma_write32(addr, DMA_ADDR); | |
458 | ||
459 | scsi_esp_cmd(esp, cmd); | |
460 | } | |
461 | ||
462 | } | |
463 | ||
464 | static int sbus_esp_dma_error(struct esp *esp) | |
465 | { | |
466 | u32 csr = dma_read32(DMA_CSR); | |
467 | ||
468 | if (csr & DMA_HNDL_ERROR) | |
469 | return 1; | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | static const struct esp_driver_ops sbus_esp_ops = { | |
475 | .esp_write8 = sbus_esp_write8, | |
476 | .esp_read8 = sbus_esp_read8, | |
477 | .map_single = sbus_esp_map_single, | |
478 | .map_sg = sbus_esp_map_sg, | |
479 | .unmap_single = sbus_esp_unmap_single, | |
480 | .unmap_sg = sbus_esp_unmap_sg, | |
481 | .irq_pending = sbus_esp_irq_pending, | |
482 | .reset_dma = sbus_esp_reset_dma, | |
483 | .dma_drain = sbus_esp_dma_drain, | |
484 | .dma_invalidate = sbus_esp_dma_invalidate, | |
485 | .send_dma_cmd = sbus_esp_send_dma_cmd, | |
486 | .dma_error = sbus_esp_dma_error, | |
487 | }; | |
488 | ||
6f039790 GKH |
489 | static int esp_sbus_probe_one(struct platform_device *op, |
490 | struct platform_device *espdma, int hme) | |
cd9ad58d DM |
491 | { |
492 | struct scsi_host_template *tpnt = &scsi_esp_template; | |
493 | struct Scsi_Host *host; | |
494 | struct esp *esp; | |
495 | int err; | |
496 | ||
497 | host = scsi_host_alloc(tpnt, sizeof(struct esp)); | |
498 | ||
499 | err = -ENOMEM; | |
500 | if (!host) | |
501 | goto fail; | |
502 | ||
503 | host->max_id = (hme ? 16 : 8); | |
2b14ec78 | 504 | esp = shost_priv(host); |
cd9ad58d DM |
505 | |
506 | esp->host = host; | |
05bb5e93 | 507 | esp->dev = op; |
cd9ad58d DM |
508 | esp->ops = &sbus_esp_ops; |
509 | ||
510 | if (hme) | |
511 | esp->flags |= ESP_FLAG_WIDE_CAPABLE; | |
512 | ||
334ae614 | 513 | err = esp_sbus_setup_dma(esp, espdma); |
cd9ad58d DM |
514 | if (err < 0) |
515 | goto fail_unlink; | |
516 | ||
517 | err = esp_sbus_map_regs(esp, hme); | |
518 | if (err < 0) | |
519 | goto fail_unlink; | |
520 | ||
521 | err = esp_sbus_map_command_block(esp); | |
522 | if (err < 0) | |
523 | goto fail_unmap_regs; | |
524 | ||
525 | err = esp_sbus_register_irq(esp); | |
526 | if (err < 0) | |
527 | goto fail_unmap_command_block; | |
528 | ||
529 | esp_sbus_get_props(esp, espdma); | |
530 | ||
531 | /* Before we try to touch the ESP chip, ESC1 dma can | |
532 | * come up with the reset bit set, so make sure that | |
533 | * is clear first. | |
534 | */ | |
334ae614 | 535 | if (esp->dmarev == dvmaesc1) { |
cd9ad58d DM |
536 | u32 val = dma_read32(DMA_CSR); |
537 | ||
538 | dma_write32(val & ~DMA_RST_SCSI, DMA_CSR); | |
539 | } | |
540 | ||
05bb5e93 | 541 | dev_set_drvdata(&op->dev, esp); |
cd9ad58d | 542 | |
05bb5e93 | 543 | err = scsi_esp_register(esp, &op->dev); |
cd9ad58d DM |
544 | if (err) |
545 | goto fail_free_irq; | |
546 | ||
547 | return 0; | |
548 | ||
549 | fail_free_irq: | |
550 | free_irq(host->irq, esp); | |
551 | fail_unmap_command_block: | |
05bb5e93 | 552 | dma_free_coherent(&op->dev, 16, |
738f2b7b DM |
553 | esp->command_block, |
554 | esp->command_block_dma); | |
cd9ad58d | 555 | fail_unmap_regs: |
05bb5e93 | 556 | of_iounmap(&op->resource[(hme ? 1 : 0)], esp->regs, SBUS_ESP_REG_SIZE); |
cd9ad58d DM |
557 | fail_unlink: |
558 | scsi_host_put(host); | |
559 | fail: | |
560 | return err; | |
561 | } | |
562 | ||
6f039790 | 563 | static int esp_sbus_probe(struct platform_device *op) |
cd9ad58d | 564 | { |
334ae614 | 565 | struct device_node *dma_node = NULL; |
61c7a080 | 566 | struct device_node *dp = op->dev.of_node; |
2dc11581 | 567 | struct platform_device *dma_of = NULL; |
cd9ad58d DM |
568 | int hme = 0; |
569 | ||
570 | if (dp->parent && | |
571 | (!strcmp(dp->parent->name, "espdma") || | |
572 | !strcmp(dp->parent->name, "dma"))) | |
334ae614 | 573 | dma_node = dp->parent; |
cd9ad58d | 574 | else if (!strcmp(dp->name, "SUNW,fas")) { |
61c7a080 | 575 | dma_node = op->dev.of_node; |
cd9ad58d DM |
576 | hme = 1; |
577 | } | |
334ae614 DM |
578 | if (dma_node) |
579 | dma_of = of_find_device_by_node(dma_node); | |
580 | if (!dma_of) | |
581 | return -ENODEV; | |
cd9ad58d | 582 | |
05bb5e93 | 583 | return esp_sbus_probe_one(op, dma_of, hme); |
cd9ad58d DM |
584 | } |
585 | ||
6f039790 | 586 | static int esp_sbus_remove(struct platform_device *op) |
cd9ad58d | 587 | { |
05bb5e93 | 588 | struct esp *esp = dev_get_drvdata(&op->dev); |
2dc11581 | 589 | struct platform_device *dma_of = esp->dma; |
cd9ad58d | 590 | unsigned int irq = esp->host->irq; |
05bb5e93 | 591 | bool is_hme; |
cd9ad58d DM |
592 | u32 val; |
593 | ||
594 | scsi_esp_unregister(esp); | |
595 | ||
596 | /* Disable interrupts. */ | |
597 | val = dma_read32(DMA_CSR); | |
598 | dma_write32(val & ~DMA_INT_ENAB, DMA_CSR); | |
599 | ||
600 | free_irq(irq, esp); | |
05bb5e93 DM |
601 | |
602 | is_hme = (esp->dmarev == dvmahme); | |
603 | ||
604 | dma_free_coherent(&op->dev, 16, | |
738f2b7b DM |
605 | esp->command_block, |
606 | esp->command_block_dma); | |
05bb5e93 DM |
607 | of_iounmap(&op->resource[(is_hme ? 1 : 0)], esp->regs, |
608 | SBUS_ESP_REG_SIZE); | |
334ae614 DM |
609 | of_iounmap(&dma_of->resource[0], esp->dma_regs, |
610 | resource_size(&dma_of->resource[0])); | |
cd9ad58d DM |
611 | |
612 | scsi_host_put(esp->host); | |
613 | ||
05bb5e93 DM |
614 | dev_set_drvdata(&op->dev, NULL); |
615 | ||
cd9ad58d DM |
616 | return 0; |
617 | } | |
618 | ||
fd098316 | 619 | static const struct of_device_id esp_match[] = { |
cd9ad58d DM |
620 | { |
621 | .name = "SUNW,esp", | |
622 | }, | |
623 | { | |
624 | .name = "SUNW,fas", | |
625 | }, | |
626 | { | |
627 | .name = "esp", | |
628 | }, | |
629 | {}, | |
630 | }; | |
631 | MODULE_DEVICE_TABLE(of, esp_match); | |
632 | ||
4ebb24f7 | 633 | static struct platform_driver esp_sbus_driver = { |
4018294b GL |
634 | .driver = { |
635 | .name = "esp", | |
636 | .owner = THIS_MODULE, | |
637 | .of_match_table = esp_match, | |
638 | }, | |
cd9ad58d | 639 | .probe = esp_sbus_probe, |
6f039790 | 640 | .remove = esp_sbus_remove, |
cd9ad58d DM |
641 | }; |
642 | ||
643 | static int __init sunesp_init(void) | |
644 | { | |
4ebb24f7 | 645 | return platform_driver_register(&esp_sbus_driver); |
cd9ad58d DM |
646 | } |
647 | ||
648 | static void __exit sunesp_exit(void) | |
649 | { | |
4ebb24f7 | 650 | platform_driver_unregister(&esp_sbus_driver); |
cd9ad58d DM |
651 | } |
652 | ||
653 | MODULE_DESCRIPTION("Sun ESP SCSI driver"); | |
654 | MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); | |
655 | MODULE_LICENSE("GPL"); | |
656 | MODULE_VERSION(DRV_VERSION); | |
657 | ||
658 | module_init(sunesp_init); | |
659 | module_exit(sunesp_exit); |