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Linux/drivers/scsi/sgiwd93.c

  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 (davem@davemloft.net)
  7  * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu)
  8  * Copyright (C) 2001 Florian Lohoff (flo@rfc822.org)
  9  * Copyright (C) 2003, 07 Ralf Baechle (ralf@linux-mips.org)
 10  * 
 11  * (In all truth, Jed Schimmel wrote all this code.)
 12  */
 13 
 14 #undef DEBUG
 15 
 16 #include <linux/delay.h>
 17 #include <linux/dma-mapping.h>
 18 #include <linux/gfp.h>
 19 #include <linux/interrupt.h>
 20 #include <linux/init.h>
 21 #include <linux/kernel.h>
 22 #include <linux/types.h>
 23 #include <linux/module.h>
 24 #include <linux/platform_device.h>
 25 #include <linux/spinlock.h>
 26 
 27 #include <asm/sgi/hpc3.h>
 28 #include <asm/sgi/ip22.h>
 29 #include <asm/sgi/wd.h>
 30 
 31 #include "scsi.h"
 32 #include "wd33c93.h"
 33 
 34 struct ip22_hostdata {
 35         struct WD33C93_hostdata wh;
 36         dma_addr_t dma;
 37         void *cpu;
 38         struct device *dev;
 39 };
 40 
 41 #define host_to_hostdata(host) ((struct ip22_hostdata *)((host)->hostdata))
 42 
 43 struct hpc_chunk {
 44         struct hpc_dma_desc desc;
 45         u32 _padding;   /* align to quadword boundary */
 46 };
 47 
 48 /* space for hpc dma descriptors */
 49 #define HPC_DMA_SIZE   PAGE_SIZE
 50 
 51 #define DMA_DIR(d)   ((d == DATA_OUT_DIR) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)
 52 
 53 static irqreturn_t sgiwd93_intr(int irq, void *dev_id)
 54 {
 55         struct Scsi_Host * host = dev_id;
 56         unsigned long flags;
 57 
 58         spin_lock_irqsave(host->host_lock, flags);
 59         wd33c93_intr(host);
 60         spin_unlock_irqrestore(host->host_lock, flags);
 61 
 62         return IRQ_HANDLED;
 63 }
 64 
 65 static inline
 66 void fill_hpc_entries(struct ip22_hostdata *hd, struct scsi_cmnd *cmd, int din)
 67 {
 68         unsigned long len = cmd->SCp.this_residual;
 69         void *addr = cmd->SCp.ptr;
 70         dma_addr_t physaddr;
 71         unsigned long count;
 72         struct hpc_chunk *hcp;
 73 
 74         physaddr = dma_map_single(hd->dev, addr, len, DMA_DIR(din));
 75         cmd->SCp.dma_handle = physaddr;
 76         hcp = hd->cpu;
 77 
 78         while (len) {
 79                 /*
 80                  * even cntinfo could be up to 16383, without
 81                  * magic only 8192 works correctly
 82                  */
 83                 count = len > 8192 ? 8192 : len;
 84                 hcp->desc.pbuf = physaddr;
 85                 hcp->desc.cntinfo = count;
 86                 hcp++;
 87                 len -= count;
 88                 physaddr += count;
 89         }
 90 
 91         /*
 92          * To make sure, if we trip an HPC bug, that we transfer every single
 93          * byte, we tag on an extra zero length dma descriptor at the end of
 94          * the chain.
 95          */
 96         hcp->desc.pbuf = 0;
 97         hcp->desc.cntinfo = HPCDMA_EOX;
 98         dma_cache_sync(hd->dev, hd->cpu,
 99                        (unsigned long)(hcp + 1) - (unsigned long)hd->cpu,
100                        DMA_TO_DEVICE);
101 }
102 
103 static int dma_setup(struct scsi_cmnd *cmd, int datainp)
104 {
105         struct ip22_hostdata *hdata = host_to_hostdata(cmd->device->host);
106         struct hpc3_scsiregs *hregs =
107                 (struct hpc3_scsiregs *) cmd->device->host->base;
108 
109         pr_debug("dma_setup: datainp<%d> hcp<%p> ", datainp, hdata->cpu);
110 
111         hdata->wh.dma_dir = datainp;
112 
113         /*
114          * wd33c93 shouldn't pass us bogus dma_setups, but it does:-(  The
115          * other wd33c93 drivers deal with it the same way (which isn't that
116          * obvious).  IMHO a better fix would be, not to do these dma setups
117          * in the first place.
118          */
119         if (cmd->SCp.ptr == NULL || cmd->SCp.this_residual == 0)
120                 return 1;
121 
122         fill_hpc_entries(hdata, cmd, datainp);
123 
124         pr_debug(" HPCGO\n");
125 
126         /* Start up the HPC. */
127         hregs->ndptr = hdata->dma;
128         if (datainp)
129                 hregs->ctrl = HPC3_SCTRL_ACTIVE;
130         else
131                 hregs->ctrl = HPC3_SCTRL_ACTIVE | HPC3_SCTRL_DIR;
132 
133         return 0;
134 }
135 
136 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
137                      int status)
138 {
139         struct ip22_hostdata *hdata = host_to_hostdata(instance);
140         struct hpc3_scsiregs *hregs;
141 
142         if (!SCpnt)
143                 return;
144 
145         if (SCpnt->SCp.ptr == NULL || SCpnt->SCp.this_residual == 0)
146                 return;
147 
148         hregs = (struct hpc3_scsiregs *) SCpnt->device->host->base;
149 
150         pr_debug("dma_stop: status<%d> ", status);
151 
152         /* First stop the HPC and flush it's FIFO. */
153         if (hdata->wh.dma_dir) {
154                 hregs->ctrl |= HPC3_SCTRL_FLUSH;
155                 while (hregs->ctrl & HPC3_SCTRL_ACTIVE)
156                         barrier();
157         }
158         hregs->ctrl = 0;
159         dma_unmap_single(hdata->dev, SCpnt->SCp.dma_handle,
160                          SCpnt->SCp.this_residual,
161                          DMA_DIR(hdata->wh.dma_dir));
162 
163         pr_debug("\n");
164 }
165 
166 void sgiwd93_reset(unsigned long base)
167 {
168         struct hpc3_scsiregs *hregs = (struct hpc3_scsiregs *) base;
169 
170         hregs->ctrl = HPC3_SCTRL_CRESET;
171         udelay(50);
172         hregs->ctrl = 0;
173 }
174 EXPORT_SYMBOL_GPL(sgiwd93_reset);
175 
176 static inline void init_hpc_chain(struct ip22_hostdata *hdata)
177 {
178         struct hpc_chunk *hcp = (struct hpc_chunk *)hdata->cpu;
179         dma_addr_t dma = hdata->dma;
180         unsigned long start, end;
181 
182         start = (unsigned long) hcp;
183         end = start + HPC_DMA_SIZE;
184         while (start < end) {
185                 hcp->desc.pnext = (u32) (dma + sizeof(struct hpc_chunk));
186                 hcp->desc.cntinfo = HPCDMA_EOX;
187                 hcp++;
188                 dma += sizeof(struct hpc_chunk);
189                 start += sizeof(struct hpc_chunk);
190         };
191         hcp--;
192         hcp->desc.pnext = hdata->dma;
193 }
194 
195 static int sgiwd93_bus_reset(struct scsi_cmnd *cmd)
196 {
197         /* FIXME perform bus-specific reset */
198 
199         /* FIXME 2: kill this function, and let midlayer fallback
200            to the same result, calling wd33c93_host_reset() */
201 
202         spin_lock_irq(cmd->device->host->host_lock);
203         wd33c93_host_reset(cmd);
204         spin_unlock_irq(cmd->device->host->host_lock);
205 
206         return SUCCESS;
207 }
208 
209 /*
210  * Kludge alert - the SCSI code calls the abort and reset method with int
211  * arguments not with pointers.  So this is going to blow up beautyfully
212  * on 64-bit systems with memory outside the compat address spaces.
213  */
214 static struct scsi_host_template sgiwd93_template = {
215         .module                 = THIS_MODULE,
216         .proc_name              = "SGIWD93",
217         .name                   = "SGI WD93",
218         .queuecommand           = wd33c93_queuecommand,
219         .eh_abort_handler       = wd33c93_abort,
220         .eh_bus_reset_handler   = sgiwd93_bus_reset,
221         .eh_host_reset_handler  = wd33c93_host_reset,
222         .can_queue              = 16,
223         .this_id                = 7,
224         .sg_tablesize           = SG_ALL,
225         .cmd_per_lun            = 8,
226         .use_clustering         = DISABLE_CLUSTERING,
227 };
228 
229 static int sgiwd93_probe(struct platform_device *pdev)
230 {
231         struct sgiwd93_platform_data *pd = pdev->dev.platform_data;
232         unsigned char *wdregs = pd->wdregs;
233         struct hpc3_scsiregs *hregs = pd->hregs;
234         struct ip22_hostdata *hdata;
235         struct Scsi_Host *host;
236         wd33c93_regs regs;
237         unsigned int unit = pd->unit;
238         unsigned int irq = pd->irq;
239         int err;
240 
241         host = scsi_host_alloc(&sgiwd93_template, sizeof(struct ip22_hostdata));
242         if (!host) {
243                 err = -ENOMEM;
244                 goto out;
245         }
246 
247         host->base = (unsigned long) hregs;
248         host->irq = irq;
249 
250         hdata = host_to_hostdata(host);
251         hdata->dev = &pdev->dev;
252         hdata->cpu = dma_alloc_noncoherent(&pdev->dev, HPC_DMA_SIZE,
253                                            &hdata->dma, GFP_KERNEL);
254         if (!hdata->cpu) {
255                 printk(KERN_WARNING "sgiwd93: Could not allocate memory for "
256                        "host %d buffer.\n", unit);
257                 err = -ENOMEM;
258                 goto out_put;
259         }
260 
261         init_hpc_chain(hdata);
262 
263         regs.SASR = wdregs + 3;
264         regs.SCMD = wdregs + 7;
265 
266         hdata->wh.no_sync = 0;
267         hdata->wh.fast = 1;
268         hdata->wh.dma_mode = CTRL_BURST;
269 
270         wd33c93_init(host, regs, dma_setup, dma_stop, WD33C93_FS_MHZ(20));
271 
272         err = request_irq(irq, sgiwd93_intr, 0, "SGI WD93", host);
273         if (err) {
274                 printk(KERN_WARNING "sgiwd93: Could not register irq %d "
275                        "for host %d.\n", irq, unit);
276                 goto out_free;
277         }
278 
279         platform_set_drvdata(pdev, host);
280 
281         err = scsi_add_host(host, NULL);
282         if (err)
283                 goto out_irq;
284 
285         scsi_scan_host(host);
286 
287         return 0;
288 
289 out_irq:
290         free_irq(irq, host);
291 out_free:
292         dma_free_noncoherent(&pdev->dev, HPC_DMA_SIZE, hdata->cpu, hdata->dma);
293 out_put:
294         scsi_host_put(host);
295 out:
296 
297         return err;
298 }
299 
300 static int __exit sgiwd93_remove(struct platform_device *pdev)
301 {
302         struct Scsi_Host *host = platform_get_drvdata(pdev);
303         struct ip22_hostdata *hdata = (struct ip22_hostdata *) host->hostdata;
304         struct sgiwd93_platform_data *pd = pdev->dev.platform_data;
305 
306         scsi_remove_host(host);
307         free_irq(pd->irq, host);
308         dma_free_noncoherent(&pdev->dev, HPC_DMA_SIZE, hdata->cpu, hdata->dma);
309         scsi_host_put(host);
310         return 0;
311 }
312 
313 static struct platform_driver sgiwd93_driver = {
314         .probe  = sgiwd93_probe,
315         .remove = sgiwd93_remove,
316         .driver = {
317                 .name   = "sgiwd93",
318                 .owner  = THIS_MODULE,
319         }
320 };
321 
322 static int __init sgiwd93_module_init(void)
323 {
324         return platform_driver_register(&sgiwd93_driver);
325 }
326 
327 static void __exit sgiwd93_module_exit(void)
328 {
329         return platform_driver_unregister(&sgiwd93_driver);
330 }
331 
332 module_init(sgiwd93_module_init);
333 module_exit(sgiwd93_module_exit);
334 
335 MODULE_DESCRIPTION("SGI WD33C93 driver");
336 MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");
337 MODULE_LICENSE("GPL");
338 MODULE_ALIAS("platform:sgiwd93");
339 

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