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David S. Millercd9ad582007-04-26 21:19:23 -07001/* sun_esp.c: ESP front-end for Sparc SBUS systems.
2 *
David S. Miller334ae612008-08-27 17:01:57 -07003 * Copyright (C) 2007, 2008 David S. Miller (davem@davemloft.net)
David S. Millercd9ad582007-04-26 21:19:23 -07004 */
5
6#include <linux/kernel.h>
7#include <linux/types.h>
David S. Miller6025dfe2007-04-29 16:12:29 -07008#include <linux/delay.h>
David S. Millercd9ad582007-04-26 21:19:23 -07009#include <linux/module.h>
Andrea Righi27ac7922008-07-23 21:28:13 -070010#include <linux/mm.h>
David S. Millercd9ad582007-04-26 21:19:23 -070011#include <linux/init.h>
David S. Miller738f2b72008-08-27 18:09:11 -070012#include <linux/dma-mapping.h>
David S. Miller05bb5e92008-08-27 00:20:58 -070013#include <linux/of.h>
14#include <linux/of_device.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090015#include <linux/gfp.h>
David S. Millercd9ad582007-04-26 21:19:23 -070016
17#include <asm/irq.h>
18#include <asm/io.h>
19#include <asm/dma.h>
20
David S. Millercd9ad582007-04-26 21:19:23 -070021#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 ": "
David S. Miller05bb5e92008-08-27 00:20:58 -070027#define DRV_VERSION "1.100"
28#define DRV_MODULE_RELDATE "August 27, 2008"
David S. Millercd9ad582007-04-26 21:19:23 -070029
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
David S. Miller334ae612008-08-27 17:01:57 -070035/* DVMA chip revisions */
36enum dvma_rev {
37 dvmarev0,
38 dvmaesc1,
39 dvmarev1,
40 dvmarev2,
41 dvmarev3,
42 dvmarevplus,
43 dvmahme
44};
45
46static int __devinit esp_sbus_setup_dma(struct esp *esp,
Grant Likely2dc11582010-08-06 09:25:50 -060047 struct platform_device *dma_of)
David S. Millercd9ad582007-04-26 21:19:23 -070048{
David S. Miller334ae612008-08-27 17:01:57 -070049 esp->dma = dma_of;
David S. Millercd9ad582007-04-26 21:19:23 -070050
David S. Miller334ae612008-08-27 17:01:57 -070051 esp->dma_regs = of_ioremap(&dma_of->resource[0], 0,
52 resource_size(&dma_of->resource[0]),
53 "espdma");
54 if (!esp->dma_regs)
55 return -ENOMEM;
David S. Millercd9ad582007-04-26 21:19:23 -070056
David S. Miller334ae612008-08-27 17:01:57 -070057 switch (dma_read32(DMA_CSR) & DMA_DEVICE_ID) {
58 case DMA_VERS0:
59 esp->dmarev = dvmarev0;
60 break;
61 case DMA_ESCV1:
62 esp->dmarev = dvmaesc1;
63 break;
64 case DMA_VERS1:
65 esp->dmarev = dvmarev1;
66 break;
67 case DMA_VERS2:
68 esp->dmarev = dvmarev2;
69 break;
70 case DMA_VERHME:
71 esp->dmarev = dvmahme;
72 break;
73 case DMA_VERSPLUS:
74 esp->dmarev = dvmarevplus;
75 break;
David S. Millercd9ad582007-04-26 21:19:23 -070076 }
77
David S. Millercd9ad582007-04-26 21:19:23 -070078 return 0;
79
80}
81
82static int __devinit esp_sbus_map_regs(struct esp *esp, int hme)
83{
Grant Likely2dc11582010-08-06 09:25:50 -060084 struct platform_device *op = esp->dev;
David S. Millercd9ad582007-04-26 21:19:23 -070085 struct resource *res;
86
87 /* On HME, two reg sets exist, first is DVMA,
88 * second is ESP registers.
89 */
90 if (hme)
David S. Miller05bb5e92008-08-27 00:20:58 -070091 res = &op->resource[1];
David S. Millercd9ad582007-04-26 21:19:23 -070092 else
David S. Miller05bb5e92008-08-27 00:20:58 -070093 res = &op->resource[0];
David S. Millercd9ad582007-04-26 21:19:23 -070094
David S. Miller05bb5e92008-08-27 00:20:58 -070095 esp->regs = of_ioremap(res, 0, SBUS_ESP_REG_SIZE, "ESP");
David S. Millercd9ad582007-04-26 21:19:23 -070096 if (!esp->regs)
97 return -ENOMEM;
98
99 return 0;
100}
101
102static int __devinit esp_sbus_map_command_block(struct esp *esp)
103{
Grant Likely2dc11582010-08-06 09:25:50 -0600104 struct platform_device *op = esp->dev;
David S. Millercd9ad582007-04-26 21:19:23 -0700105
David S. Miller05bb5e92008-08-27 00:20:58 -0700106 esp->command_block = dma_alloc_coherent(&op->dev, 16,
David S. Miller738f2b72008-08-27 18:09:11 -0700107 &esp->command_block_dma,
108 GFP_ATOMIC);
David S. Millercd9ad582007-04-26 21:19:23 -0700109 if (!esp->command_block)
110 return -ENOMEM;
111 return 0;
112}
113
114static int __devinit esp_sbus_register_irq(struct esp *esp)
115{
116 struct Scsi_Host *host = esp->host;
Grant Likely2dc11582010-08-06 09:25:50 -0600117 struct platform_device *op = esp->dev;
David S. Millercd9ad582007-04-26 21:19:23 -0700118
Grant Likely1636f8a2010-06-18 11:09:58 -0600119 host->irq = op->archdata.irqs[0];
David S. Millercd9ad582007-04-26 21:19:23 -0700120 return request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
121}
122
Grant Likely2dc11582010-08-06 09:25:50 -0600123static void __devinit esp_get_scsi_id(struct esp *esp, struct platform_device *espdma)
David S. Millercd9ad582007-04-26 21:19:23 -0700124{
Grant Likely2dc11582010-08-06 09:25:50 -0600125 struct platform_device *op = esp->dev;
David S. Miller05bb5e92008-08-27 00:20:58 -0700126 struct device_node *dp;
David S. Millercd9ad582007-04-26 21:19:23 -0700127
Grant Likely61c7a082010-04-13 16:12:29 -0700128 dp = op->dev.of_node;
David S. Millercd9ad582007-04-26 21:19:23 -0700129 esp->scsi_id = of_getintprop_default(dp, "initiator-id", 0xff);
130 if (esp->scsi_id != 0xff)
131 goto done;
132
133 esp->scsi_id = of_getintprop_default(dp, "scsi-initiator-id", 0xff);
134 if (esp->scsi_id != 0xff)
135 goto done;
136
Grant Likely61c7a082010-04-13 16:12:29 -0700137 esp->scsi_id = of_getintprop_default(espdma->dev.of_node,
David S. Millercd9ad582007-04-26 21:19:23 -0700138 "scsi-initiator-id", 7);
139
140done:
141 esp->host->this_id = esp->scsi_id;
142 esp->scsi_id_mask = (1 << esp->scsi_id);
143}
144
145static void __devinit esp_get_differential(struct esp *esp)
146{
Grant Likely2dc11582010-08-06 09:25:50 -0600147 struct platform_device *op = esp->dev;
David S. Miller05bb5e92008-08-27 00:20:58 -0700148 struct device_node *dp;
David S. Millercd9ad582007-04-26 21:19:23 -0700149
Grant Likely61c7a082010-04-13 16:12:29 -0700150 dp = op->dev.of_node;
David S. Millercd9ad582007-04-26 21:19:23 -0700151 if (of_find_property(dp, "differential", NULL))
152 esp->flags |= ESP_FLAG_DIFFERENTIAL;
153 else
154 esp->flags &= ~ESP_FLAG_DIFFERENTIAL;
155}
156
157static void __devinit esp_get_clock_params(struct esp *esp)
158{
Grant Likely2dc11582010-08-06 09:25:50 -0600159 struct platform_device *op = esp->dev;
David S. Miller05bb5e92008-08-27 00:20:58 -0700160 struct device_node *bus_dp, *dp;
David S. Millercd9ad582007-04-26 21:19:23 -0700161 int fmhz;
162
Grant Likely61c7a082010-04-13 16:12:29 -0700163 dp = op->dev.of_node;
David S. Miller05bb5e92008-08-27 00:20:58 -0700164 bus_dp = dp->parent;
David S. Millercd9ad582007-04-26 21:19:23 -0700165
166 fmhz = of_getintprop_default(dp, "clock-frequency", 0);
167 if (fmhz == 0)
David S. Miller05bb5e92008-08-27 00:20:58 -0700168 fmhz = of_getintprop_default(bus_dp, "clock-frequency", 0);
David S. Millercd9ad582007-04-26 21:19:23 -0700169
170 esp->cfreq = fmhz;
171}
172
Grant Likely2dc11582010-08-06 09:25:50 -0600173static void __devinit esp_get_bursts(struct esp *esp, struct platform_device *dma_of)
David S. Millercd9ad582007-04-26 21:19:23 -0700174{
Grant Likely61c7a082010-04-13 16:12:29 -0700175 struct device_node *dma_dp = dma_of->dev.of_node;
Grant Likely2dc11582010-08-06 09:25:50 -0600176 struct platform_device *op = esp->dev;
David S. Miller334ae612008-08-27 17:01:57 -0700177 struct device_node *dp;
178 u8 bursts, val;
David S. Millercd9ad582007-04-26 21:19:23 -0700179
Grant Likely61c7a082010-04-13 16:12:29 -0700180 dp = op->dev.of_node;
David S. Millercd9ad582007-04-26 21:19:23 -0700181 bursts = of_getintprop_default(dp, "burst-sizes", 0xff);
David S. Miller334ae612008-08-27 17:01:57 -0700182 val = of_getintprop_default(dma_dp, "burst-sizes", 0xff);
183 if (val != 0xff)
184 bursts &= val;
David S. Millercd9ad582007-04-26 21:19:23 -0700185
David S. Miller05bb5e92008-08-27 00:20:58 -0700186 val = of_getintprop_default(dma_dp->parent, "burst-sizes", 0xff);
187 if (val != 0xff)
188 bursts &= val;
David S. Millercd9ad582007-04-26 21:19:23 -0700189
190 if (bursts == 0xff ||
191 (bursts & DMA_BURST16) == 0 ||
192 (bursts & DMA_BURST32) == 0)
193 bursts = (DMA_BURST32 - 1);
194
195 esp->bursts = bursts;
196}
197
Grant Likely2dc11582010-08-06 09:25:50 -0600198static void __devinit esp_sbus_get_props(struct esp *esp, struct platform_device *espdma)
David S. Millercd9ad582007-04-26 21:19:23 -0700199{
David S. Miller05bb5e92008-08-27 00:20:58 -0700200 esp_get_scsi_id(esp, espdma);
David S. Millercd9ad582007-04-26 21:19:23 -0700201 esp_get_differential(esp);
202 esp_get_clock_params(esp);
203 esp_get_bursts(esp, espdma);
204}
205
206static void sbus_esp_write8(struct esp *esp, u8 val, unsigned long reg)
207{
208 sbus_writeb(val, esp->regs + (reg * 4UL));
209}
210
211static u8 sbus_esp_read8(struct esp *esp, unsigned long reg)
212{
213 return sbus_readb(esp->regs + (reg * 4UL));
214}
215
216static dma_addr_t sbus_esp_map_single(struct esp *esp, void *buf,
217 size_t sz, int dir)
218{
Grant Likely2dc11582010-08-06 09:25:50 -0600219 struct platform_device *op = esp->dev;
David S. Miller7a715f42008-08-27 18:37:58 -0700220
David S. Miller05bb5e92008-08-27 00:20:58 -0700221 return dma_map_single(&op->dev, buf, sz, dir);
David S. Millercd9ad582007-04-26 21:19:23 -0700222}
223
224static int sbus_esp_map_sg(struct esp *esp, struct scatterlist *sg,
225 int num_sg, int dir)
226{
Grant Likely2dc11582010-08-06 09:25:50 -0600227 struct platform_device *op = esp->dev;
David S. Miller7a715f42008-08-27 18:37:58 -0700228
David S. Miller05bb5e92008-08-27 00:20:58 -0700229 return dma_map_sg(&op->dev, sg, num_sg, dir);
David S. Millercd9ad582007-04-26 21:19:23 -0700230}
231
232static void sbus_esp_unmap_single(struct esp *esp, dma_addr_t addr,
233 size_t sz, int dir)
234{
Grant Likely2dc11582010-08-06 09:25:50 -0600235 struct platform_device *op = esp->dev;
David S. Miller7a715f42008-08-27 18:37:58 -0700236
David S. Miller05bb5e92008-08-27 00:20:58 -0700237 dma_unmap_single(&op->dev, addr, sz, dir);
David S. Millercd9ad582007-04-26 21:19:23 -0700238}
239
240static void sbus_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
241 int num_sg, int dir)
242{
Grant Likely2dc11582010-08-06 09:25:50 -0600243 struct platform_device *op = esp->dev;
David S. Miller7a715f42008-08-27 18:37:58 -0700244
David S. Miller05bb5e92008-08-27 00:20:58 -0700245 dma_unmap_sg(&op->dev, sg, num_sg, dir);
David S. Millercd9ad582007-04-26 21:19:23 -0700246}
247
248static int sbus_esp_irq_pending(struct esp *esp)
249{
250 if (dma_read32(DMA_CSR) & (DMA_HNDL_INTR | DMA_HNDL_ERROR))
251 return 1;
252 return 0;
253}
254
255static void sbus_esp_reset_dma(struct esp *esp)
256{
257 int can_do_burst16, can_do_burst32, can_do_burst64;
258 int can_do_sbus64, lim;
Grant Likely2dc11582010-08-06 09:25:50 -0600259 struct platform_device *op;
David S. Millercd9ad582007-04-26 21:19:23 -0700260 u32 val;
261
262 can_do_burst16 = (esp->bursts & DMA_BURST16) != 0;
263 can_do_burst32 = (esp->bursts & DMA_BURST32) != 0;
264 can_do_burst64 = 0;
265 can_do_sbus64 = 0;
David S. Miller05bb5e92008-08-27 00:20:58 -0700266 op = esp->dev;
David S. Miller63237ee2008-08-26 23:33:42 -0700267 if (sbus_can_dma_64bit())
David S. Millercd9ad582007-04-26 21:19:23 -0700268 can_do_sbus64 = 1;
David S. Miller63237ee2008-08-26 23:33:42 -0700269 if (sbus_can_burst64())
David S. Millercd9ad582007-04-26 21:19:23 -0700270 can_do_burst64 = (esp->bursts & DMA_BURST64) != 0;
271
272 /* Put the DVMA into a known state. */
David S. Miller334ae612008-08-27 17:01:57 -0700273 if (esp->dmarev != dvmahme) {
David S. Millercd9ad582007-04-26 21:19:23 -0700274 val = dma_read32(DMA_CSR);
275 dma_write32(val | DMA_RST_SCSI, DMA_CSR);
276 dma_write32(val & ~DMA_RST_SCSI, DMA_CSR);
277 }
David S. Miller334ae612008-08-27 17:01:57 -0700278 switch (esp->dmarev) {
David S. Millercd9ad582007-04-26 21:19:23 -0700279 case dvmahme:
280 dma_write32(DMA_RESET_FAS366, DMA_CSR);
281 dma_write32(DMA_RST_SCSI, DMA_CSR);
282
283 esp->prev_hme_dmacsr = (DMA_PARITY_OFF | DMA_2CLKS |
284 DMA_SCSI_DISAB | DMA_INT_ENAB);
285
286 esp->prev_hme_dmacsr &= ~(DMA_ENABLE | DMA_ST_WRITE |
287 DMA_BRST_SZ);
288
289 if (can_do_burst64)
290 esp->prev_hme_dmacsr |= DMA_BRST64;
291 else if (can_do_burst32)
292 esp->prev_hme_dmacsr |= DMA_BRST32;
293
294 if (can_do_sbus64) {
295 esp->prev_hme_dmacsr |= DMA_SCSI_SBUS64;
David S. Miller05bb5e92008-08-27 00:20:58 -0700296 sbus_set_sbus64(&op->dev, esp->bursts);
David S. Millercd9ad582007-04-26 21:19:23 -0700297 }
298
299 lim = 1000;
300 while (dma_read32(DMA_CSR) & DMA_PEND_READ) {
301 if (--lim == 0) {
302 printk(KERN_ALERT PFX "esp%d: DMA_PEND_READ "
303 "will not clear!\n",
304 esp->host->unique_id);
305 break;
306 }
307 udelay(1);
308 }
309
310 dma_write32(0, DMA_CSR);
311 dma_write32(esp->prev_hme_dmacsr, DMA_CSR);
312
313 dma_write32(0, DMA_ADDR);
314 break;
315
316 case dvmarev2:
317 if (esp->rev != ESP100) {
318 val = dma_read32(DMA_CSR);
319 dma_write32(val | DMA_3CLKS, DMA_CSR);
320 }
321 break;
322
323 case dvmarev3:
324 val = dma_read32(DMA_CSR);
325 val &= ~DMA_3CLKS;
326 val |= DMA_2CLKS;
327 if (can_do_burst32) {
328 val &= ~DMA_BRST_SZ;
329 val |= DMA_BRST32;
330 }
331 dma_write32(val, DMA_CSR);
332 break;
333
334 case dvmaesc1:
335 val = dma_read32(DMA_CSR);
336 val |= DMA_ADD_ENABLE;
337 val &= ~DMA_BCNT_ENAB;
338 if (!can_do_burst32 && can_do_burst16) {
339 val |= DMA_ESC_BURST;
340 } else {
341 val &= ~(DMA_ESC_BURST);
342 }
343 dma_write32(val, DMA_CSR);
344 break;
345
346 default:
347 break;
348 }
349
350 /* Enable interrupts. */
351 val = dma_read32(DMA_CSR);
352 dma_write32(val | DMA_INT_ENAB, DMA_CSR);
353}
354
355static void sbus_esp_dma_drain(struct esp *esp)
356{
357 u32 csr;
358 int lim;
359
David S. Miller334ae612008-08-27 17:01:57 -0700360 if (esp->dmarev == dvmahme)
David S. Millercd9ad582007-04-26 21:19:23 -0700361 return;
362
363 csr = dma_read32(DMA_CSR);
364 if (!(csr & DMA_FIFO_ISDRAIN))
365 return;
366
David S. Miller334ae612008-08-27 17:01:57 -0700367 if (esp->dmarev != dvmarev3 && esp->dmarev != dvmaesc1)
David S. Millercd9ad582007-04-26 21:19:23 -0700368 dma_write32(csr | DMA_FIFO_STDRAIN, DMA_CSR);
369
370 lim = 1000;
371 while (dma_read32(DMA_CSR) & DMA_FIFO_ISDRAIN) {
372 if (--lim == 0) {
373 printk(KERN_ALERT PFX "esp%d: DMA will not drain!\n",
374 esp->host->unique_id);
375 break;
376 }
377 udelay(1);
378 }
379}
380
381static void sbus_esp_dma_invalidate(struct esp *esp)
382{
David S. Miller334ae612008-08-27 17:01:57 -0700383 if (esp->dmarev == dvmahme) {
David S. Millercd9ad582007-04-26 21:19:23 -0700384 dma_write32(DMA_RST_SCSI, DMA_CSR);
385
386 esp->prev_hme_dmacsr = ((esp->prev_hme_dmacsr |
387 (DMA_PARITY_OFF | DMA_2CLKS |
388 DMA_SCSI_DISAB | DMA_INT_ENAB)) &
389 ~(DMA_ST_WRITE | DMA_ENABLE));
390
391 dma_write32(0, DMA_CSR);
392 dma_write32(esp->prev_hme_dmacsr, DMA_CSR);
393
394 /* This is necessary to avoid having the SCSI channel
395 * engine lock up on us.
396 */
397 dma_write32(0, DMA_ADDR);
398 } else {
399 u32 val;
400 int lim;
401
402 lim = 1000;
403 while ((val = dma_read32(DMA_CSR)) & DMA_PEND_READ) {
404 if (--lim == 0) {
405 printk(KERN_ALERT PFX "esp%d: DMA will not "
406 "invalidate!\n", esp->host->unique_id);
407 break;
408 }
409 udelay(1);
410 }
411
412 val &= ~(DMA_ENABLE | DMA_ST_WRITE | DMA_BCNT_ENAB);
413 val |= DMA_FIFO_INV;
414 dma_write32(val, DMA_CSR);
415 val &= ~DMA_FIFO_INV;
416 dma_write32(val, DMA_CSR);
417 }
418}
419
420static void sbus_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count,
421 u32 dma_count, int write, u8 cmd)
422{
423 u32 csr;
424
425 BUG_ON(!(cmd & ESP_CMD_DMA));
426
427 sbus_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
428 sbus_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
429 if (esp->rev == FASHME) {
430 sbus_esp_write8(esp, (esp_count >> 16) & 0xff, FAS_RLO);
431 sbus_esp_write8(esp, 0, FAS_RHI);
432
433 scsi_esp_cmd(esp, cmd);
434
435 csr = esp->prev_hme_dmacsr;
436 csr |= DMA_SCSI_DISAB | DMA_ENABLE;
437 if (write)
438 csr |= DMA_ST_WRITE;
439 else
440 csr &= ~DMA_ST_WRITE;
441 esp->prev_hme_dmacsr = csr;
442
443 dma_write32(dma_count, DMA_COUNT);
444 dma_write32(addr, DMA_ADDR);
445 dma_write32(csr, DMA_CSR);
446 } else {
447 csr = dma_read32(DMA_CSR);
448 csr |= DMA_ENABLE;
449 if (write)
450 csr |= DMA_ST_WRITE;
451 else
452 csr &= ~DMA_ST_WRITE;
453 dma_write32(csr, DMA_CSR);
David S. Miller334ae612008-08-27 17:01:57 -0700454 if (esp->dmarev == dvmaesc1) {
David S. Millercd9ad582007-04-26 21:19:23 -0700455 u32 end = PAGE_ALIGN(addr + dma_count + 16U);
456 dma_write32(end - addr, DMA_COUNT);
457 }
458 dma_write32(addr, DMA_ADDR);
459
460 scsi_esp_cmd(esp, cmd);
461 }
462
463}
464
465static int sbus_esp_dma_error(struct esp *esp)
466{
467 u32 csr = dma_read32(DMA_CSR);
468
469 if (csr & DMA_HNDL_ERROR)
470 return 1;
471
472 return 0;
473}
474
475static const struct esp_driver_ops sbus_esp_ops = {
476 .esp_write8 = sbus_esp_write8,
477 .esp_read8 = sbus_esp_read8,
478 .map_single = sbus_esp_map_single,
479 .map_sg = sbus_esp_map_sg,
480 .unmap_single = sbus_esp_unmap_single,
481 .unmap_sg = sbus_esp_unmap_sg,
482 .irq_pending = sbus_esp_irq_pending,
483 .reset_dma = sbus_esp_reset_dma,
484 .dma_drain = sbus_esp_dma_drain,
485 .dma_invalidate = sbus_esp_dma_invalidate,
486 .send_dma_cmd = sbus_esp_send_dma_cmd,
487 .dma_error = sbus_esp_dma_error,
488};
489
Grant Likely2dc11582010-08-06 09:25:50 -0600490static int __devinit esp_sbus_probe_one(struct platform_device *op,
491 struct platform_device *espdma,
David S. Millercd9ad582007-04-26 21:19:23 -0700492 int hme)
493{
494 struct scsi_host_template *tpnt = &scsi_esp_template;
495 struct Scsi_Host *host;
496 struct esp *esp;
497 int err;
498
499 host = scsi_host_alloc(tpnt, sizeof(struct esp));
500
501 err = -ENOMEM;
502 if (!host)
503 goto fail;
504
505 host->max_id = (hme ? 16 : 8);
Christoph Hellwig2b14ec72007-05-31 20:12:32 +0200506 esp = shost_priv(host);
David S. Millercd9ad582007-04-26 21:19:23 -0700507
508 esp->host = host;
David S. Miller05bb5e92008-08-27 00:20:58 -0700509 esp->dev = op;
David S. Millercd9ad582007-04-26 21:19:23 -0700510 esp->ops = &sbus_esp_ops;
511
512 if (hme)
513 esp->flags |= ESP_FLAG_WIDE_CAPABLE;
514
David S. Miller334ae612008-08-27 17:01:57 -0700515 err = esp_sbus_setup_dma(esp, espdma);
David S. Millercd9ad582007-04-26 21:19:23 -0700516 if (err < 0)
517 goto fail_unlink;
518
519 err = esp_sbus_map_regs(esp, hme);
520 if (err < 0)
521 goto fail_unlink;
522
523 err = esp_sbus_map_command_block(esp);
524 if (err < 0)
525 goto fail_unmap_regs;
526
527 err = esp_sbus_register_irq(esp);
528 if (err < 0)
529 goto fail_unmap_command_block;
530
531 esp_sbus_get_props(esp, espdma);
532
533 /* Before we try to touch the ESP chip, ESC1 dma can
534 * come up with the reset bit set, so make sure that
535 * is clear first.
536 */
David S. Miller334ae612008-08-27 17:01:57 -0700537 if (esp->dmarev == dvmaesc1) {
David S. Millercd9ad582007-04-26 21:19:23 -0700538 u32 val = dma_read32(DMA_CSR);
539
540 dma_write32(val & ~DMA_RST_SCSI, DMA_CSR);
541 }
542
David S. Miller05bb5e92008-08-27 00:20:58 -0700543 dev_set_drvdata(&op->dev, esp);
David S. Millercd9ad582007-04-26 21:19:23 -0700544
David S. Miller05bb5e92008-08-27 00:20:58 -0700545 err = scsi_esp_register(esp, &op->dev);
David S. Millercd9ad582007-04-26 21:19:23 -0700546 if (err)
547 goto fail_free_irq;
548
549 return 0;
550
551fail_free_irq:
552 free_irq(host->irq, esp);
553fail_unmap_command_block:
David S. Miller05bb5e92008-08-27 00:20:58 -0700554 dma_free_coherent(&op->dev, 16,
David S. Miller738f2b72008-08-27 18:09:11 -0700555 esp->command_block,
556 esp->command_block_dma);
David S. Millercd9ad582007-04-26 21:19:23 -0700557fail_unmap_regs:
David S. Miller05bb5e92008-08-27 00:20:58 -0700558 of_iounmap(&op->resource[(hme ? 1 : 0)], esp->regs, SBUS_ESP_REG_SIZE);
David S. Millercd9ad582007-04-26 21:19:23 -0700559fail_unlink:
560 scsi_host_put(host);
561fail:
562 return err;
563}
564
Grant Likely2dc11582010-08-06 09:25:50 -0600565static int __devinit esp_sbus_probe(struct platform_device *op, const struct of_device_id *match)
David S. Millercd9ad582007-04-26 21:19:23 -0700566{
David S. Miller334ae612008-08-27 17:01:57 -0700567 struct device_node *dma_node = NULL;
Grant Likely61c7a082010-04-13 16:12:29 -0700568 struct device_node *dp = op->dev.of_node;
Grant Likely2dc11582010-08-06 09:25:50 -0600569 struct platform_device *dma_of = NULL;
David S. Millercd9ad582007-04-26 21:19:23 -0700570 int hme = 0;
571
572 if (dp->parent &&
573 (!strcmp(dp->parent->name, "espdma") ||
574 !strcmp(dp->parent->name, "dma")))
David S. Miller334ae612008-08-27 17:01:57 -0700575 dma_node = dp->parent;
David S. Millercd9ad582007-04-26 21:19:23 -0700576 else if (!strcmp(dp->name, "SUNW,fas")) {
Grant Likely61c7a082010-04-13 16:12:29 -0700577 dma_node = op->dev.of_node;
David S. Millercd9ad582007-04-26 21:19:23 -0700578 hme = 1;
579 }
David S. Miller334ae612008-08-27 17:01:57 -0700580 if (dma_node)
581 dma_of = of_find_device_by_node(dma_node);
582 if (!dma_of)
583 return -ENODEV;
David S. Millercd9ad582007-04-26 21:19:23 -0700584
David S. Miller05bb5e92008-08-27 00:20:58 -0700585 return esp_sbus_probe_one(op, dma_of, hme);
David S. Millercd9ad582007-04-26 21:19:23 -0700586}
587
Grant Likely2dc11582010-08-06 09:25:50 -0600588static int __devexit esp_sbus_remove(struct platform_device *op)
David S. Millercd9ad582007-04-26 21:19:23 -0700589{
David S. Miller05bb5e92008-08-27 00:20:58 -0700590 struct esp *esp = dev_get_drvdata(&op->dev);
Grant Likely2dc11582010-08-06 09:25:50 -0600591 struct platform_device *dma_of = esp->dma;
David S. Millercd9ad582007-04-26 21:19:23 -0700592 unsigned int irq = esp->host->irq;
David S. Miller05bb5e92008-08-27 00:20:58 -0700593 bool is_hme;
David S. Millercd9ad582007-04-26 21:19:23 -0700594 u32 val;
595
596 scsi_esp_unregister(esp);
597
598 /* Disable interrupts. */
599 val = dma_read32(DMA_CSR);
600 dma_write32(val & ~DMA_INT_ENAB, DMA_CSR);
601
602 free_irq(irq, esp);
David S. Miller05bb5e92008-08-27 00:20:58 -0700603
604 is_hme = (esp->dmarev == dvmahme);
605
606 dma_free_coherent(&op->dev, 16,
David S. Miller738f2b72008-08-27 18:09:11 -0700607 esp->command_block,
608 esp->command_block_dma);
David S. Miller05bb5e92008-08-27 00:20:58 -0700609 of_iounmap(&op->resource[(is_hme ? 1 : 0)], esp->regs,
610 SBUS_ESP_REG_SIZE);
David S. Miller334ae612008-08-27 17:01:57 -0700611 of_iounmap(&dma_of->resource[0], esp->dma_regs,
612 resource_size(&dma_of->resource[0]));
David S. Millercd9ad582007-04-26 21:19:23 -0700613
614 scsi_host_put(esp->host);
615
David S. Miller05bb5e92008-08-27 00:20:58 -0700616 dev_set_drvdata(&op->dev, NULL);
617
David S. Millercd9ad582007-04-26 21:19:23 -0700618 return 0;
619}
620
David S. Millerfd098312008-08-31 01:23:17 -0700621static const struct of_device_id esp_match[] = {
David S. Millercd9ad582007-04-26 21:19:23 -0700622 {
623 .name = "SUNW,esp",
624 },
625 {
626 .name = "SUNW,fas",
627 },
628 {
629 .name = "esp",
630 },
631 {},
632};
633MODULE_DEVICE_TABLE(of, esp_match);
634
635static struct of_platform_driver esp_sbus_driver = {
Grant Likely40182942010-04-13 16:13:02 -0700636 .driver = {
637 .name = "esp",
638 .owner = THIS_MODULE,
639 .of_match_table = esp_match,
640 },
David S. Millercd9ad582007-04-26 21:19:23 -0700641 .probe = esp_sbus_probe,
642 .remove = __devexit_p(esp_sbus_remove),
643};
644
645static int __init sunesp_init(void)
646{
Grant Likely1ab1d632010-06-24 15:14:37 -0600647 return of_register_platform_driver(&esp_sbus_driver);
David S. Millercd9ad582007-04-26 21:19:23 -0700648}
649
650static void __exit sunesp_exit(void)
651{
Grant Likely1ab1d632010-06-24 15:14:37 -0600652 of_unregister_platform_driver(&esp_sbus_driver);
David S. Millercd9ad582007-04-26 21:19:23 -0700653}
654
655MODULE_DESCRIPTION("Sun ESP SCSI driver");
656MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
657MODULE_LICENSE("GPL");
658MODULE_VERSION(DRV_VERSION);
659
660module_init(sunesp_init);
661module_exit(sunesp_exit);