drm/radeon/kms: fix DDIA enable on some rs690 systems
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / a3000.c
blobd9468027fb6150caed5a9854623b5673ddff58a4
1 #include <linux/types.h>
2 #include <linux/mm.h>
3 #include <linux/ioport.h>
4 #include <linux/init.h>
5 #include <linux/slab.h>
6 #include <linux/spinlock.h>
7 #include <linux/interrupt.h>
8 #include <linux/platform_device.h>
10 #include <asm/page.h>
11 #include <asm/pgtable.h>
12 #include <asm/amigaints.h>
13 #include <asm/amigahw.h>
15 #include "scsi.h"
16 #include "wd33c93.h"
17 #include "a3000.h"
20 struct a3000_hostdata {
21 struct WD33C93_hostdata wh;
22 struct a3000_scsiregs *regs;
25 static irqreturn_t a3000_intr(int irq, void *data)
27 struct Scsi_Host *instance = data;
28 struct a3000_hostdata *hdata = shost_priv(instance);
29 unsigned int status = hdata->regs->ISTR;
30 unsigned long flags;
32 if (!(status & ISTR_INT_P))
33 return IRQ_NONE;
34 if (status & ISTR_INTS) {
35 spin_lock_irqsave(instance->host_lock, flags);
36 wd33c93_intr(instance);
37 spin_unlock_irqrestore(instance->host_lock, flags);
38 return IRQ_HANDLED;
40 pr_warning("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
41 return IRQ_NONE;
44 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
46 struct Scsi_Host *instance = cmd->device->host;
47 struct a3000_hostdata *hdata = shost_priv(instance);
48 struct WD33C93_hostdata *wh = &hdata->wh;
49 struct a3000_scsiregs *regs = hdata->regs;
50 unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
51 unsigned long addr = virt_to_bus(cmd->SCp.ptr);
54 * if the physical address has the wrong alignment, or if
55 * physical address is bad, or if it is a write and at the
56 * end of a physical memory chunk, then allocate a bounce
57 * buffer
59 if (addr & A3000_XFER_MASK) {
60 wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
61 wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
62 GFP_KERNEL);
64 /* can't allocate memory; use PIO */
65 if (!wh->dma_bounce_buffer) {
66 wh->dma_bounce_len = 0;
67 return 1;
70 if (!dir_in) {
71 /* copy to bounce buffer for a write */
72 memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
73 cmd->SCp.this_residual);
76 addr = virt_to_bus(wh->dma_bounce_buffer);
79 /* setup dma direction */
80 if (!dir_in)
81 cntr |= CNTR_DDIR;
83 /* remember direction */
84 wh->dma_dir = dir_in;
86 regs->CNTR = cntr;
88 /* setup DMA *physical* address */
89 regs->ACR = addr;
91 if (dir_in) {
92 /* invalidate any cache */
93 cache_clear(addr, cmd->SCp.this_residual);
94 } else {
95 /* push any dirty cache */
96 cache_push(addr, cmd->SCp.this_residual);
99 /* start DMA */
100 mb(); /* make sure setup is completed */
101 regs->ST_DMA = 1;
102 mb(); /* make sure DMA has started before next IO */
104 /* return success */
105 return 0;
108 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
109 int status)
111 struct a3000_hostdata *hdata = shost_priv(instance);
112 struct WD33C93_hostdata *wh = &hdata->wh;
113 struct a3000_scsiregs *regs = hdata->regs;
115 /* disable SCSI interrupts */
116 unsigned short cntr = CNTR_PDMD;
118 if (!wh->dma_dir)
119 cntr |= CNTR_DDIR;
121 regs->CNTR = cntr;
122 mb(); /* make sure CNTR is updated before next IO */
124 /* flush if we were reading */
125 if (wh->dma_dir) {
126 regs->FLUSH = 1;
127 mb(); /* don't allow prefetch */
128 while (!(regs->ISTR & ISTR_FE_FLG))
129 barrier();
130 mb(); /* no IO until FLUSH is done */
133 /* clear a possible interrupt */
134 /* I think that this CINT is only necessary if you are
135 * using the terminal count features. HM 7 Mar 1994
137 regs->CINT = 1;
139 /* stop DMA */
140 regs->SP_DMA = 1;
141 mb(); /* make sure DMA is stopped before next IO */
143 /* restore the CONTROL bits (minus the direction flag) */
144 regs->CNTR = CNTR_PDMD | CNTR_INTEN;
145 mb(); /* make sure CNTR is updated before next IO */
147 /* copy from a bounce buffer, if necessary */
148 if (status && wh->dma_bounce_buffer) {
149 if (SCpnt) {
150 if (wh->dma_dir && SCpnt)
151 memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
152 SCpnt->SCp.this_residual);
153 kfree(wh->dma_bounce_buffer);
154 wh->dma_bounce_buffer = NULL;
155 wh->dma_bounce_len = 0;
156 } else {
157 kfree(wh->dma_bounce_buffer);
158 wh->dma_bounce_buffer = NULL;
159 wh->dma_bounce_len = 0;
164 static int a3000_bus_reset(struct scsi_cmnd *cmd)
166 struct Scsi_Host *instance = cmd->device->host;
168 /* FIXME perform bus-specific reset */
170 /* FIXME 2: kill this entire function, which should
171 cause mid-layer to call wd33c93_host_reset anyway? */
173 spin_lock_irq(instance->host_lock);
174 wd33c93_host_reset(cmd);
175 spin_unlock_irq(instance->host_lock);
177 return SUCCESS;
180 static struct scsi_host_template amiga_a3000_scsi_template = {
181 .module = THIS_MODULE,
182 .name = "Amiga 3000 built-in SCSI",
183 .proc_info = wd33c93_proc_info,
184 .proc_name = "A3000",
185 .queuecommand = wd33c93_queuecommand,
186 .eh_abort_handler = wd33c93_abort,
187 .eh_bus_reset_handler = a3000_bus_reset,
188 .eh_host_reset_handler = wd33c93_host_reset,
189 .can_queue = CAN_QUEUE,
190 .this_id = 7,
191 .sg_tablesize = SG_ALL,
192 .cmd_per_lun = CMD_PER_LUN,
193 .use_clustering = ENABLE_CLUSTERING
196 static int __init amiga_a3000_scsi_probe(struct platform_device *pdev)
198 struct resource *res;
199 struct Scsi_Host *instance;
200 int error;
201 struct a3000_scsiregs *regs;
202 wd33c93_regs wdregs;
203 struct a3000_hostdata *hdata;
205 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
206 if (!res)
207 return -ENODEV;
209 if (!request_mem_region(res->start, resource_size(res), "wd33c93"))
210 return -EBUSY;
212 instance = scsi_host_alloc(&amiga_a3000_scsi_template,
213 sizeof(struct a3000_hostdata));
214 if (!instance) {
215 error = -ENOMEM;
216 goto fail_alloc;
219 instance->irq = IRQ_AMIGA_PORTS;
221 regs = (struct a3000_scsiregs *)ZTWO_VADDR(res->start);
222 regs->DAWR = DAWR_A3000;
224 wdregs.SASR = &regs->SASR;
225 wdregs.SCMD = &regs->SCMD;
227 hdata = shost_priv(instance);
228 hdata->wh.no_sync = 0xff;
229 hdata->wh.fast = 0;
230 hdata->wh.dma_mode = CTRL_DMA;
231 hdata->regs = regs;
233 wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_12_15);
234 error = request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED,
235 "A3000 SCSI", instance);
236 if (error)
237 goto fail_irq;
239 regs->CNTR = CNTR_PDMD | CNTR_INTEN;
241 error = scsi_add_host(instance, NULL);
242 if (error)
243 goto fail_host;
245 platform_set_drvdata(pdev, instance);
247 scsi_scan_host(instance);
248 return 0;
250 fail_host:
251 free_irq(IRQ_AMIGA_PORTS, instance);
252 fail_irq:
253 scsi_host_put(instance);
254 fail_alloc:
255 release_mem_region(res->start, resource_size(res));
256 return error;
259 static int __exit amiga_a3000_scsi_remove(struct platform_device *pdev)
261 struct Scsi_Host *instance = platform_get_drvdata(pdev);
262 struct a3000_hostdata *hdata = shost_priv(instance);
263 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
265 hdata->regs->CNTR = 0;
266 scsi_remove_host(instance);
267 free_irq(IRQ_AMIGA_PORTS, instance);
268 scsi_host_put(instance);
269 release_mem_region(res->start, resource_size(res));
270 return 0;
273 static struct platform_driver amiga_a3000_scsi_driver = {
274 .remove = __exit_p(amiga_a3000_scsi_remove),
275 .driver = {
276 .name = "amiga-a3000-scsi",
277 .owner = THIS_MODULE,
281 static int __init amiga_a3000_scsi_init(void)
283 return platform_driver_probe(&amiga_a3000_scsi_driver,
284 amiga_a3000_scsi_probe);
286 module_init(amiga_a3000_scsi_init);
288 static void __exit amiga_a3000_scsi_exit(void)
290 platform_driver_unregister(&amiga_a3000_scsi_driver);
292 module_exit(amiga_a3000_scsi_exit);
294 MODULE_DESCRIPTION("Amiga 3000 built-in SCSI");
295 MODULE_LICENSE("GPL");
296 MODULE_ALIAS("platform:amiga-a3000-scsi");