blob: 4f1db6f2aae88617f689ae46f3dfa62af0fd0499 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
7 * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu)
8 * Copyright (C) 2001 Florian Lohoff (flo@rfc822.org)
9 * Copyright (C) 2003 Ralf Baechle (ralf@linux-mips.org)
10 *
11 * (In all truth, Jed Schimmel wrote all this code.)
12 */
13#include <linux/init.h>
14#include <linux/interrupt.h>
15#include <linux/types.h>
16#include <linux/mm.h>
17#include <linux/blkdev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/delay.h>
19#include <linux/dma-mapping.h>
20#include <linux/spinlock.h>
21
22#include <asm/page.h>
23#include <asm/pgtable.h>
24#include <asm/sgialib.h>
25#include <asm/sgi/sgi.h>
26#include <asm/sgi/mc.h>
27#include <asm/sgi/hpc3.h>
28#include <asm/sgi/ip22.h>
29#include <asm/irq.h>
30#include <asm/io.h>
31
32#include "scsi.h"
33#include <scsi/scsi_host.h>
34#include "wd33c93.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36#include <linux/stat.h>
37
38#if 0
39#define DPRINTK(args...) printk(args)
40#else
41#define DPRINTK(args...)
42#endif
43
44#define HDATA(ptr) ((struct ip22_hostdata *)((ptr)->hostdata))
45
46struct ip22_hostdata {
47 struct WD33C93_hostdata wh;
48 struct hpc_data {
49 dma_addr_t dma;
50 void * cpu;
51 } hd;
52};
53
54struct hpc_chunk {
55 struct hpc_dma_desc desc;
56 u32 _padding; /* align to quadword boundary */
57};
58
59struct Scsi_Host *sgiwd93_host;
60struct Scsi_Host *sgiwd93_host1;
61
62/* Wuff wuff, wuff, wd33c93.c, wuff wuff, object oriented, bow wow. */
63static inline void write_wd33c93_count(const wd33c93_regs regs,
64 unsigned long value)
65{
66 *regs.SASR = WD_TRANSFER_COUNT_MSB;
67 mb();
68 *regs.SCMD = ((value >> 16) & 0xff);
69 *regs.SCMD = ((value >> 8) & 0xff);
70 *regs.SCMD = ((value >> 0) & 0xff);
71 mb();
72}
73
74static inline unsigned long read_wd33c93_count(const wd33c93_regs regs)
75{
76 unsigned long value;
77
78 *regs.SASR = WD_TRANSFER_COUNT_MSB;
79 mb();
80 value = ((*regs.SCMD & 0xff) << 16);
81 value |= ((*regs.SCMD & 0xff) << 8);
82 value |= ((*regs.SCMD & 0xff) << 0);
83 mb();
84 return value;
85}
86
87static irqreturn_t sgiwd93_intr(int irq, void *dev_id, struct pt_regs *regs)
88{
89 struct Scsi_Host * host = (struct Scsi_Host *) dev_id;
90 unsigned long flags;
91
92 spin_lock_irqsave(host->host_lock, flags);
93 wd33c93_intr(host);
94 spin_unlock_irqrestore(host->host_lock, flags);
95
96 return IRQ_HANDLED;
97}
98
99static inline
Henrik Kretzschmar65396412006-09-12 23:49:33 +0200100void fill_hpc_entries(struct hpc_chunk *hcp, struct scsi_cmnd *cmd, int datainp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
102 unsigned long len = cmd->SCp.this_residual;
103 void *addr = cmd->SCp.ptr;
104 dma_addr_t physaddr;
105 unsigned long count;
106
107 physaddr = dma_map_single(NULL, addr, len, cmd->sc_data_direction);
108 cmd->SCp.dma_handle = physaddr;
109
110 while (len) {
111 /*
112 * even cntinfo could be up to 16383, without
113 * magic only 8192 works correctly
114 */
115 count = len > 8192 ? 8192 : len;
116 hcp->desc.pbuf = physaddr;
117 hcp->desc.cntinfo = count;
118 hcp++;
119 len -= count;
120 physaddr += count;
121 }
122
123 /*
124 * To make sure, if we trip an HPC bug, that we transfer every single
125 * byte, we tag on an extra zero length dma descriptor at the end of
126 * the chain.
127 */
128 hcp->desc.pbuf = 0;
129 hcp->desc.cntinfo = HPCDMA_EOX;
130}
131
Henrik Kretzschmar65396412006-09-12 23:49:33 +0200132static int dma_setup(struct scsi_cmnd *cmd, int datainp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133{
134 struct ip22_hostdata *hdata = HDATA(cmd->device->host);
135 struct hpc3_scsiregs *hregs =
136 (struct hpc3_scsiregs *) cmd->device->host->base;
137 struct hpc_chunk *hcp = (struct hpc_chunk *) hdata->hd.cpu;
138
139 DPRINTK("dma_setup: datainp<%d> hcp<%p> ", datainp, hcp);
140
141 hdata->wh.dma_dir = datainp;
142
143 /*
144 * wd33c93 shouldn't pass us bogus dma_setups, but it does:-( The
145 * other wd33c93 drivers deal with it the same way (which isn't that
146 * obvious). IMHO a better fix would be, not to do these dma setups
147 * in the first place.
148 */
149 if (cmd->SCp.ptr == NULL || cmd->SCp.this_residual == 0)
150 return 1;
151
152 fill_hpc_entries(hcp, cmd, datainp);
153
154 DPRINTK(" HPCGO\n");
155
156 /* Start up the HPC. */
157 hregs->ndptr = hdata->hd.dma;
158 if (datainp)
159 hregs->ctrl = HPC3_SCTRL_ACTIVE;
160 else
161 hregs->ctrl = HPC3_SCTRL_ACTIVE | HPC3_SCTRL_DIR;
162
163 return 0;
164}
165
Henrik Kretzschmar65396412006-09-12 23:49:33 +0200166static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 int status)
168{
169 struct ip22_hostdata *hdata = HDATA(instance);
170 struct hpc3_scsiregs *hregs;
171
172 if (!SCpnt)
173 return;
174
175 hregs = (struct hpc3_scsiregs *) SCpnt->device->host->base;
176
177 DPRINTK("dma_stop: status<%d> ", status);
178
179 /* First stop the HPC and flush it's FIFO. */
180 if (hdata->wh.dma_dir) {
181 hregs->ctrl |= HPC3_SCTRL_FLUSH;
182 while (hregs->ctrl & HPC3_SCTRL_ACTIVE)
183 barrier();
184 }
185 hregs->ctrl = 0;
186 dma_unmap_single(NULL, SCpnt->SCp.dma_handle, SCpnt->SCp.this_residual,
187 SCpnt->sc_data_direction);
188
189 DPRINTK("\n");
190}
191
192void sgiwd93_reset(unsigned long base)
193{
194 struct hpc3_scsiregs *hregs = (struct hpc3_scsiregs *) base;
195
196 hregs->ctrl = HPC3_SCTRL_CRESET;
197 udelay(50);
198 hregs->ctrl = 0;
199}
200
201static inline void init_hpc_chain(struct hpc_data *hd)
202{
203 struct hpc_chunk *hcp = (struct hpc_chunk *) hd->cpu;
204 struct hpc_chunk *dma = (struct hpc_chunk *) hd->dma;
205 unsigned long start, end;
206
207 start = (unsigned long) hcp;
208 end = start + PAGE_SIZE;
209 while (start < end) {
210 hcp->desc.pnext = (u32) (dma + 1);
211 hcp->desc.cntinfo = HPCDMA_EOX;
212 hcp++; dma++;
213 start += sizeof(struct hpc_chunk);
214 };
215 hcp--;
216 hcp->desc.pnext = hd->dma;
217}
218
219static struct Scsi_Host * __init sgiwd93_setup_scsi(
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +0100220 struct scsi_host_template *SGIblows, int unit, int irq,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 struct hpc3_scsiregs *hregs, unsigned char *wdregs)
222{
223 struct ip22_hostdata *hdata;
224 struct Scsi_Host *host;
225 wd33c93_regs regs;
226
227 host = scsi_register(SGIblows, sizeof(struct ip22_hostdata));
228 if (!host)
229 return NULL;
230
231 host->base = (unsigned long) hregs;
232 host->irq = irq;
233
234 hdata = HDATA(host);
235 hdata->hd.cpu = dma_alloc_coherent(NULL, PAGE_SIZE, &hdata->hd.dma,
236 GFP_KERNEL);
237 if (!hdata->hd.cpu) {
238 printk(KERN_WARNING "sgiwd93: Could not allocate memory for "
239 "host %d buffer.\n", unit);
240 goto out_unregister;
241 }
242 init_hpc_chain(&hdata->hd);
243
244 regs.SASR = wdregs + 3;
245 regs.SCMD = wdregs + 7;
246
247 wd33c93_init(host, regs, dma_setup, dma_stop, WD33C93_FS_16_20);
248
249 hdata->wh.no_sync = 0;
250
251 if (request_irq(irq, sgiwd93_intr, 0, "SGI WD93", (void *) host)) {
252 printk(KERN_WARNING "sgiwd93: Could not register irq %d "
253 "for host %d.\n", irq, unit);
254 goto out_free;
255 }
256 return host;
257
258out_free:
259 dma_free_coherent(NULL, PAGE_SIZE, hdata->hd.cpu, hdata->hd.dma);
260 wd33c93_release();
261
262out_unregister:
263 scsi_unregister(host);
264
265 return NULL;
266}
267
Ralf Baechlea0b6b6e2006-03-09 14:35:13 +0000268static int __init sgiwd93_detect(struct scsi_host_template *SGIblows)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269{
270 int found = 0;
271
272 SGIblows->proc_name = "SGIWD93";
273 sgiwd93_host = sgiwd93_setup_scsi(SGIblows, 0, SGI_WD93_0_IRQ,
274 &hpc3c0->scsi_chan0,
275 (unsigned char *)hpc3c0->scsi0_ext);
276 if (sgiwd93_host)
277 found++;
278
279 /* Set up second controller on the Indigo2 */
280 if (ip22_is_fullhouse()) {
281 sgiwd93_host1 = sgiwd93_setup_scsi(SGIblows, 1, SGI_WD93_1_IRQ,
282 &hpc3c0->scsi_chan1,
283 (unsigned char *)hpc3c0->scsi1_ext);
284 if (sgiwd93_host1)
285 found++;
286 }
287
288 return found;
289}
290
Ralf Baechlea0b6b6e2006-03-09 14:35:13 +0000291static int sgiwd93_release(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292{
293 struct ip22_hostdata *hdata = HDATA(instance);
294 int irq = 0;
295
296 if (sgiwd93_host && sgiwd93_host == instance)
297 irq = SGI_WD93_0_IRQ;
298 else if (sgiwd93_host1 && sgiwd93_host1 == instance)
299 irq = SGI_WD93_1_IRQ;
300
301 free_irq(irq, sgiwd93_intr);
302 dma_free_coherent(NULL, PAGE_SIZE, hdata->hd.cpu, hdata->hd.dma);
303 wd33c93_release();
304
305 return 1;
306}
307
Henrik Kretzschmar65396412006-09-12 23:49:33 +0200308static int sgiwd93_bus_reset(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309{
310 /* FIXME perform bus-specific reset */
Jeff Garzik 68b3aa72005-05-28 07:56:31 -0400311
Jeff Garzik df0ae242005-05-28 07:57:14 -0400312 /* FIXME 2: kill this function, and let midlayer fallback
313 to the same result, calling wd33c93_host_reset() */
314
Jeff Garzik 68b3aa72005-05-28 07:56:31 -0400315 spin_lock_irq(cmd->device->host->host_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 wd33c93_host_reset(cmd);
Jeff Garzik 68b3aa72005-05-28 07:56:31 -0400317 spin_unlock_irq(cmd->device->host->host_lock);
318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 return SUCCESS;
320}
321
322/*
323 * Kludge alert - the SCSI code calls the abort and reset method with int
324 * arguments not with pointers. So this is going to blow up beautyfully
325 * on 64-bit systems with memory outside the compat address spaces.
326 */
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +0100327static struct scsi_host_template driver_template = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 .proc_name = "SGIWD93",
329 .name = "SGI WD93",
330 .detect = sgiwd93_detect,
331 .release = sgiwd93_release,
332 .queuecommand = wd33c93_queuecommand,
333 .eh_abort_handler = wd33c93_abort,
334 .eh_bus_reset_handler = sgiwd93_bus_reset,
335 .eh_host_reset_handler = wd33c93_host_reset,
Ralf Baechled25cf1c2005-10-20 19:04:34 +0100336 .can_queue = 16,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 .this_id = 7,
338 .sg_tablesize = SG_ALL,
Ralf Baechled25cf1c2005-10-20 19:04:34 +0100339 .cmd_per_lun = 8,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 .use_clustering = DISABLE_CLUSTERING,
341};
342#include "scsi_module.c"