staging/bcm: add sparse annotations
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / a2091.c
blob1bb5d3f0e260f1a94a74b15deb47301212784d19
1 #include <linux/types.h>
2 #include <linux/init.h>
3 #include <linux/interrupt.h>
4 #include <linux/mm.h>
5 #include <linux/slab.h>
6 #include <linux/spinlock.h>
7 #include <linux/zorro.h>
9 #include <asm/page.h>
10 #include <asm/pgtable.h>
11 #include <asm/amigaints.h>
12 #include <asm/amigahw.h>
14 #include "scsi.h"
15 #include "wd33c93.h"
16 #include "a2091.h"
19 struct a2091_hostdata {
20 struct WD33C93_hostdata wh;
21 struct a2091_scsiregs *regs;
24 static irqreturn_t a2091_intr(int irq, void *data)
26 struct Scsi_Host *instance = data;
27 struct a2091_hostdata *hdata = shost_priv(instance);
28 unsigned int status = hdata->regs->ISTR;
29 unsigned long flags;
31 if (!(status & (ISTR_INT_F | ISTR_INT_P)) || !(status & ISTR_INTS))
32 return IRQ_NONE;
34 spin_lock_irqsave(instance->host_lock, flags);
35 wd33c93_intr(instance);
36 spin_unlock_irqrestore(instance->host_lock, flags);
37 return IRQ_HANDLED;
40 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
42 struct Scsi_Host *instance = cmd->device->host;
43 struct a2091_hostdata *hdata = shost_priv(instance);
44 struct WD33C93_hostdata *wh = &hdata->wh;
45 struct a2091_scsiregs *regs = hdata->regs;
46 unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
47 unsigned long addr = virt_to_bus(cmd->SCp.ptr);
49 /* don't allow DMA if the physical address is bad */
50 if (addr & A2091_XFER_MASK) {
51 wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
52 wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
53 GFP_KERNEL);
55 /* can't allocate memory; use PIO */
56 if (!wh->dma_bounce_buffer) {
57 wh->dma_bounce_len = 0;
58 return 1;
61 /* get the physical address of the bounce buffer */
62 addr = virt_to_bus(wh->dma_bounce_buffer);
64 /* the bounce buffer may not be in the first 16M of physmem */
65 if (addr & A2091_XFER_MASK) {
66 /* we could use chipmem... maybe later */
67 kfree(wh->dma_bounce_buffer);
68 wh->dma_bounce_buffer = NULL;
69 wh->dma_bounce_len = 0;
70 return 1;
73 if (!dir_in) {
74 /* copy to bounce buffer for a write */
75 memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
76 cmd->SCp.this_residual);
80 /* setup dma direction */
81 if (!dir_in)
82 cntr |= CNTR_DDIR;
84 /* remember direction */
85 wh->dma_dir = dir_in;
87 regs->CNTR = cntr;
89 /* setup DMA *physical* address */
90 regs->ACR = addr;
92 if (dir_in) {
93 /* invalidate any cache */
94 cache_clear(addr, cmd->SCp.this_residual);
95 } else {
96 /* push any dirty cache */
97 cache_push(addr, cmd->SCp.this_residual);
99 /* start DMA */
100 regs->ST_DMA = 1;
102 /* return success */
103 return 0;
106 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
107 int status)
109 struct a2091_hostdata *hdata = shost_priv(instance);
110 struct WD33C93_hostdata *wh = &hdata->wh;
111 struct a2091_scsiregs *regs = hdata->regs;
113 /* disable SCSI interrupts */
114 unsigned short cntr = CNTR_PDMD;
116 if (!wh->dma_dir)
117 cntr |= CNTR_DDIR;
119 /* disable SCSI interrupts */
120 regs->CNTR = cntr;
122 /* flush if we were reading */
123 if (wh->dma_dir) {
124 regs->FLUSH = 1;
125 while (!(regs->ISTR & ISTR_FE_FLG))
129 /* clear a possible interrupt */
130 regs->CINT = 1;
132 /* stop DMA */
133 regs->SP_DMA = 1;
135 /* restore the CONTROL bits (minus the direction flag) */
136 regs->CNTR = CNTR_PDMD | CNTR_INTEN;
138 /* copy from a bounce buffer, if necessary */
139 if (status && wh->dma_bounce_buffer) {
140 if (wh->dma_dir)
141 memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
142 SCpnt->SCp.this_residual);
143 kfree(wh->dma_bounce_buffer);
144 wh->dma_bounce_buffer = NULL;
145 wh->dma_bounce_len = 0;
149 static int a2091_bus_reset(struct scsi_cmnd *cmd)
151 struct Scsi_Host *instance = cmd->device->host;
153 /* FIXME perform bus-specific reset */
155 /* FIXME 2: kill this function, and let midlayer fall back
156 to the same action, calling wd33c93_host_reset() */
158 spin_lock_irq(instance->host_lock);
159 wd33c93_host_reset(cmd);
160 spin_unlock_irq(instance->host_lock);
162 return SUCCESS;
165 static struct scsi_host_template a2091_scsi_template = {
166 .module = THIS_MODULE,
167 .name = "Commodore A2091/A590 SCSI",
168 .proc_info = wd33c93_proc_info,
169 .proc_name = "A2901",
170 .queuecommand = wd33c93_queuecommand,
171 .eh_abort_handler = wd33c93_abort,
172 .eh_bus_reset_handler = a2091_bus_reset,
173 .eh_host_reset_handler = wd33c93_host_reset,
174 .can_queue = CAN_QUEUE,
175 .this_id = 7,
176 .sg_tablesize = SG_ALL,
177 .cmd_per_lun = CMD_PER_LUN,
178 .use_clustering = DISABLE_CLUSTERING
181 static int __devinit a2091_probe(struct zorro_dev *z,
182 const struct zorro_device_id *ent)
184 struct Scsi_Host *instance;
185 int error;
186 struct a2091_scsiregs *regs;
187 wd33c93_regs wdregs;
188 struct a2091_hostdata *hdata;
190 if (!request_mem_region(z->resource.start, 256, "wd33c93"))
191 return -EBUSY;
193 instance = scsi_host_alloc(&a2091_scsi_template,
194 sizeof(struct a2091_hostdata));
195 if (!instance) {
196 error = -ENOMEM;
197 goto fail_alloc;
200 instance->irq = IRQ_AMIGA_PORTS;
201 instance->unique_id = z->slotaddr;
203 regs = (struct a2091_scsiregs *)ZTWO_VADDR(z->resource.start);
204 regs->DAWR = DAWR_A2091;
206 wdregs.SASR = &regs->SASR;
207 wdregs.SCMD = &regs->SCMD;
209 hdata = shost_priv(instance);
210 hdata->wh.no_sync = 0xff;
211 hdata->wh.fast = 0;
212 hdata->wh.dma_mode = CTRL_DMA;
213 hdata->regs = regs;
215 wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_8_10);
216 error = request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
217 "A2091 SCSI", instance);
218 if (error)
219 goto fail_irq;
221 regs->CNTR = CNTR_PDMD | CNTR_INTEN;
223 error = scsi_add_host(instance, NULL);
224 if (error)
225 goto fail_host;
227 zorro_set_drvdata(z, instance);
229 scsi_scan_host(instance);
230 return 0;
232 fail_host:
233 free_irq(IRQ_AMIGA_PORTS, instance);
234 fail_irq:
235 scsi_host_put(instance);
236 fail_alloc:
237 release_mem_region(z->resource.start, 256);
238 return error;
241 static void __devexit a2091_remove(struct zorro_dev *z)
243 struct Scsi_Host *instance = zorro_get_drvdata(z);
244 struct a2091_hostdata *hdata = shost_priv(instance);
246 hdata->regs->CNTR = 0;
247 scsi_remove_host(instance);
248 free_irq(IRQ_AMIGA_PORTS, instance);
249 scsi_host_put(instance);
250 release_mem_region(z->resource.start, 256);
253 static struct zorro_device_id a2091_zorro_tbl[] __devinitdata = {
254 { ZORRO_PROD_CBM_A590_A2091_1 },
255 { ZORRO_PROD_CBM_A590_A2091_2 },
256 { 0 }
258 MODULE_DEVICE_TABLE(zorro, a2091_zorro_tbl);
260 static struct zorro_driver a2091_driver = {
261 .name = "a2091",
262 .id_table = a2091_zorro_tbl,
263 .probe = a2091_probe,
264 .remove = __devexit_p(a2091_remove),
267 static int __init a2091_init(void)
269 return zorro_register_driver(&a2091_driver);
271 module_init(a2091_init);
273 static void __exit a2091_exit(void)
275 zorro_unregister_driver(&a2091_driver);
277 module_exit(a2091_exit);
279 MODULE_DESCRIPTION("Commodore A2091/A590 SCSI");
280 MODULE_LICENSE("GPL");