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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/scsi/sgiwd93.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/scsi/sgiwd93.c')
-rw-r--r--drivers/scsi/sgiwd93.c337
1 files changed, 337 insertions, 0 deletions
diff --git a/drivers/scsi/sgiwd93.c b/drivers/scsi/sgiwd93.c
new file mode 100644
index 000000000000..270f2aa88faa
--- /dev/null
+++ b/drivers/scsi/sgiwd93.c
@@ -0,0 +1,337 @@
1/*
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>
18#include <linux/version.h>
19#include <linux/delay.h>
20#include <linux/dma-mapping.h>
21#include <linux/spinlock.h>
22
23#include <asm/page.h>
24#include <asm/pgtable.h>
25#include <asm/sgialib.h>
26#include <asm/sgi/sgi.h>
27#include <asm/sgi/mc.h>
28#include <asm/sgi/hpc3.h>
29#include <asm/sgi/ip22.h>
30#include <asm/irq.h>
31#include <asm/io.h>
32
33#include "scsi.h"
34#include <scsi/scsi_host.h>
35#include "wd33c93.h"
36#include "sgiwd93.h"
37
38#include <linux/stat.h>
39
40#if 0
41#define DPRINTK(args...) printk(args)
42#else
43#define DPRINTK(args...)
44#endif
45
46#define HDATA(ptr) ((struct ip22_hostdata *)((ptr)->hostdata))
47
48struct ip22_hostdata {
49 struct WD33C93_hostdata wh;
50 struct hpc_data {
51 dma_addr_t dma;
52 void * cpu;
53 } hd;
54};
55
56struct hpc_chunk {
57 struct hpc_dma_desc desc;
58 u32 _padding; /* align to quadword boundary */
59};
60
61struct Scsi_Host *sgiwd93_host;
62struct Scsi_Host *sgiwd93_host1;
63
64/* Wuff wuff, wuff, wd33c93.c, wuff wuff, object oriented, bow wow. */
65static inline void write_wd33c93_count(const wd33c93_regs regs,
66 unsigned long value)
67{
68 *regs.SASR = WD_TRANSFER_COUNT_MSB;
69 mb();
70 *regs.SCMD = ((value >> 16) & 0xff);
71 *regs.SCMD = ((value >> 8) & 0xff);
72 *regs.SCMD = ((value >> 0) & 0xff);
73 mb();
74}
75
76static inline unsigned long read_wd33c93_count(const wd33c93_regs regs)
77{
78 unsigned long value;
79
80 *regs.SASR = WD_TRANSFER_COUNT_MSB;
81 mb();
82 value = ((*regs.SCMD & 0xff) << 16);
83 value |= ((*regs.SCMD & 0xff) << 8);
84 value |= ((*regs.SCMD & 0xff) << 0);
85 mb();
86 return value;
87}
88
89static irqreturn_t sgiwd93_intr(int irq, void *dev_id, struct pt_regs *regs)
90{
91 struct Scsi_Host * host = (struct Scsi_Host *) dev_id;
92 unsigned long flags;
93
94 spin_lock_irqsave(host->host_lock, flags);
95 wd33c93_intr(host);
96 spin_unlock_irqrestore(host->host_lock, flags);
97
98 return IRQ_HANDLED;
99}
100
101static inline
102void fill_hpc_entries(struct hpc_chunk *hcp, Scsi_Cmnd *cmd, int datainp)
103{
104 unsigned long len = cmd->SCp.this_residual;
105 void *addr = cmd->SCp.ptr;
106 dma_addr_t physaddr;
107 unsigned long count;
108
109 physaddr = dma_map_single(NULL, addr, len, cmd->sc_data_direction);
110 cmd->SCp.dma_handle = physaddr;
111
112 while (len) {
113 /*
114 * even cntinfo could be up to 16383, without
115 * magic only 8192 works correctly
116 */
117 count = len > 8192 ? 8192 : len;
118 hcp->desc.pbuf = physaddr;
119 hcp->desc.cntinfo = count;
120 hcp++;
121 len -= count;
122 physaddr += count;
123 }
124
125 /*
126 * To make sure, if we trip an HPC bug, that we transfer every single
127 * byte, we tag on an extra zero length dma descriptor at the end of
128 * the chain.
129 */
130 hcp->desc.pbuf = 0;
131 hcp->desc.cntinfo = HPCDMA_EOX;
132}
133
134static int dma_setup(Scsi_Cmnd *cmd, int datainp)
135{
136 struct ip22_hostdata *hdata = HDATA(cmd->device->host);
137 struct hpc3_scsiregs *hregs =
138 (struct hpc3_scsiregs *) cmd->device->host->base;
139 struct hpc_chunk *hcp = (struct hpc_chunk *) hdata->hd.cpu;
140
141 DPRINTK("dma_setup: datainp<%d> hcp<%p> ", datainp, hcp);
142
143 hdata->wh.dma_dir = datainp;
144
145 /*
146 * wd33c93 shouldn't pass us bogus dma_setups, but it does:-( The
147 * other wd33c93 drivers deal with it the same way (which isn't that
148 * obvious). IMHO a better fix would be, not to do these dma setups
149 * in the first place.
150 */
151 if (cmd->SCp.ptr == NULL || cmd->SCp.this_residual == 0)
152 return 1;
153
154 fill_hpc_entries(hcp, cmd, datainp);
155
156 DPRINTK(" HPCGO\n");
157
158 /* Start up the HPC. */
159 hregs->ndptr = hdata->hd.dma;
160 if (datainp)
161 hregs->ctrl = HPC3_SCTRL_ACTIVE;
162 else
163 hregs->ctrl = HPC3_SCTRL_ACTIVE | HPC3_SCTRL_DIR;
164
165 return 0;
166}
167
168static void dma_stop(struct Scsi_Host *instance, Scsi_Cmnd *SCpnt,
169 int status)
170{
171 struct ip22_hostdata *hdata = HDATA(instance);
172 struct hpc3_scsiregs *hregs;
173
174 if (!SCpnt)
175 return;
176
177 hregs = (struct hpc3_scsiregs *) SCpnt->device->host->base;
178
179 DPRINTK("dma_stop: status<%d> ", status);
180
181 /* First stop the HPC and flush it's FIFO. */
182 if (hdata->wh.dma_dir) {
183 hregs->ctrl |= HPC3_SCTRL_FLUSH;
184 while (hregs->ctrl & HPC3_SCTRL_ACTIVE)
185 barrier();
186 }
187 hregs->ctrl = 0;
188 dma_unmap_single(NULL, SCpnt->SCp.dma_handle, SCpnt->SCp.this_residual,
189 SCpnt->sc_data_direction);
190
191 DPRINTK("\n");
192}
193
194void sgiwd93_reset(unsigned long base)
195{
196 struct hpc3_scsiregs *hregs = (struct hpc3_scsiregs *) base;
197
198 hregs->ctrl = HPC3_SCTRL_CRESET;
199 udelay(50);
200 hregs->ctrl = 0;
201}
202
203static inline void init_hpc_chain(struct hpc_data *hd)
204{
205 struct hpc_chunk *hcp = (struct hpc_chunk *) hd->cpu;
206 struct hpc_chunk *dma = (struct hpc_chunk *) hd->dma;
207 unsigned long start, end;
208
209 start = (unsigned long) hcp;
210 end = start + PAGE_SIZE;
211 while (start < end) {
212 hcp->desc.pnext = (u32) (dma + 1);
213 hcp->desc.cntinfo = HPCDMA_EOX;
214 hcp++; dma++;
215 start += sizeof(struct hpc_chunk);
216 };
217 hcp--;
218 hcp->desc.pnext = hd->dma;
219}
220
221static struct Scsi_Host * __init sgiwd93_setup_scsi(
222 Scsi_Host_Template *SGIblows, int unit, int irq,
223 struct hpc3_scsiregs *hregs, unsigned char *wdregs)
224{
225 struct ip22_hostdata *hdata;
226 struct Scsi_Host *host;
227 wd33c93_regs regs;
228
229 host = scsi_register(SGIblows, sizeof(struct ip22_hostdata));
230 if (!host)
231 return NULL;
232
233 host->base = (unsigned long) hregs;
234 host->irq = irq;
235
236 hdata = HDATA(host);
237 hdata->hd.cpu = dma_alloc_coherent(NULL, PAGE_SIZE, &hdata->hd.dma,
238 GFP_KERNEL);
239 if (!hdata->hd.cpu) {
240 printk(KERN_WARNING "sgiwd93: Could not allocate memory for "
241 "host %d buffer.\n", unit);
242 goto out_unregister;
243 }
244 init_hpc_chain(&hdata->hd);
245
246 regs.SASR = wdregs + 3;
247 regs.SCMD = wdregs + 7;
248
249 wd33c93_init(host, regs, dma_setup, dma_stop, WD33C93_FS_16_20);
250
251 hdata->wh.no_sync = 0;
252
253 if (request_irq(irq, sgiwd93_intr, 0, "SGI WD93", (void *) host)) {
254 printk(KERN_WARNING "sgiwd93: Could not register irq %d "
255 "for host %d.\n", irq, unit);
256 goto out_free;
257 }
258 return host;
259
260out_free:
261 dma_free_coherent(NULL, PAGE_SIZE, hdata->hd.cpu, hdata->hd.dma);
262 wd33c93_release();
263
264out_unregister:
265 scsi_unregister(host);
266
267 return NULL;
268}
269
270int __init sgiwd93_detect(Scsi_Host_Template *SGIblows)
271{
272 int found = 0;
273
274 SGIblows->proc_name = "SGIWD93";
275 sgiwd93_host = sgiwd93_setup_scsi(SGIblows, 0, SGI_WD93_0_IRQ,
276 &hpc3c0->scsi_chan0,
277 (unsigned char *)hpc3c0->scsi0_ext);
278 if (sgiwd93_host)
279 found++;
280
281 /* Set up second controller on the Indigo2 */
282 if (ip22_is_fullhouse()) {
283 sgiwd93_host1 = sgiwd93_setup_scsi(SGIblows, 1, SGI_WD93_1_IRQ,
284 &hpc3c0->scsi_chan1,
285 (unsigned char *)hpc3c0->scsi1_ext);
286 if (sgiwd93_host1)
287 found++;
288 }
289
290 return found;
291}
292
293int sgiwd93_release(struct Scsi_Host *instance)
294{
295 struct ip22_hostdata *hdata = HDATA(instance);
296 int irq = 0;
297
298 if (sgiwd93_host && sgiwd93_host == instance)
299 irq = SGI_WD93_0_IRQ;
300 else if (sgiwd93_host1 && sgiwd93_host1 == instance)
301 irq = SGI_WD93_1_IRQ;
302
303 free_irq(irq, sgiwd93_intr);
304 dma_free_coherent(NULL, PAGE_SIZE, hdata->hd.cpu, hdata->hd.dma);
305 wd33c93_release();
306
307 return 1;
308}
309
310static int sgiwd93_bus_reset(Scsi_Cmnd *cmd)
311{
312 /* FIXME perform bus-specific reset */
313 wd33c93_host_reset(cmd);
314 return SUCCESS;
315}
316
317/*
318 * Kludge alert - the SCSI code calls the abort and reset method with int
319 * arguments not with pointers. So this is going to blow up beautyfully
320 * on 64-bit systems with memory outside the compat address spaces.
321 */
322static Scsi_Host_Template driver_template = {
323 .proc_name = "SGIWD93",
324 .name = "SGI WD93",
325 .detect = sgiwd93_detect,
326 .release = sgiwd93_release,
327 .queuecommand = wd33c93_queuecommand,
328 .eh_abort_handler = wd33c93_abort,
329 .eh_bus_reset_handler = sgiwd93_bus_reset,
330 .eh_host_reset_handler = wd33c93_host_reset,
331 .can_queue = CAN_QUEUE,
332 .this_id = 7,
333 .sg_tablesize = SG_ALL,
334 .cmd_per_lun = CMD_PER_LUN,
335 .use_clustering = DISABLE_CLUSTERING,
336};
337#include "scsi_module.c"