Merge with rsync://rsync.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6.git
[linux-2.6] / drivers / scsi / a2091.c
1 #include <linux/types.h>
2 #include <linux/mm.h>
3 #include <linux/blkdev.h>
4 #include <linux/sched.h>
5 #include <linux/version.h>
6 #include <linux/init.h>
7 #include <linux/interrupt.h>
8
9 #include <asm/setup.h>
10 #include <asm/page.h>
11 #include <asm/pgtable.h>
12 #include <asm/amigaints.h>
13 #include <asm/amigahw.h>
14 #include <linux/zorro.h>
15 #include <asm/irq.h>
16 #include <linux/spinlock.h>
17
18 #include "scsi.h"
19 #include <scsi/scsi_host.h>
20 #include "wd33c93.h"
21 #include "a2091.h"
22
23 #include<linux/stat.h>
24
25 #define DMA(ptr) ((a2091_scsiregs *)((ptr)->base))
26 #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
27
28 static irqreturn_t a2091_intr (int irq, void *_instance, struct pt_regs *fp)
29 {
30     unsigned long flags;
31     unsigned int status;
32     struct Scsi_Host *instance = (struct Scsi_Host *)_instance;
33
34     status = DMA(instance)->ISTR;
35     if (!(status & (ISTR_INT_F|ISTR_INT_P)) || !(status & ISTR_INTS))
36         return IRQ_NONE;
37
38     spin_lock_irqsave(instance->host_lock, flags);
39     wd33c93_intr(instance);
40     spin_unlock_irqrestore(instance->host_lock, flags);
41     return IRQ_HANDLED;
42 }
43
44 static int dma_setup (Scsi_Cmnd *cmd, int dir_in)
45 {
46     unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
47     unsigned long addr = virt_to_bus(cmd->SCp.ptr);
48     struct Scsi_Host *instance = cmd->device->host;
49
50     /* don't allow DMA if the physical address is bad */
51     if (addr & A2091_XFER_MASK ||
52         (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
53     {
54         HDATA(instance)->dma_bounce_len = (cmd->SCp.this_residual + 511)
55             & ~0x1ff;
56         HDATA(instance)->dma_bounce_buffer =
57             kmalloc (HDATA(instance)->dma_bounce_len, GFP_KERNEL);
58         
59         /* can't allocate memory; use PIO */
60         if (!HDATA(instance)->dma_bounce_buffer) {
61             HDATA(instance)->dma_bounce_len = 0;
62             return 1;
63         }
64
65         /* get the physical address of the bounce buffer */
66         addr = virt_to_bus(HDATA(instance)->dma_bounce_buffer);
67
68         /* the bounce buffer may not be in the first 16M of physmem */
69         if (addr & A2091_XFER_MASK) {
70             /* we could use chipmem... maybe later */
71             kfree (HDATA(instance)->dma_bounce_buffer);
72             HDATA(instance)->dma_bounce_buffer = NULL;
73             HDATA(instance)->dma_bounce_len = 0;
74             return 1;
75         }
76
77         if (!dir_in) {
78             /* copy to bounce buffer for a write */
79             if (cmd->use_sg)
80 #if 0
81                 panic ("scsi%ddma: incomplete s/g support",
82                        instance->host_no);
83 #else
84                 memcpy (HDATA(instance)->dma_bounce_buffer,
85                         cmd->SCp.ptr, cmd->SCp.this_residual);
86 #endif
87             else
88                 memcpy (HDATA(instance)->dma_bounce_buffer,
89                         cmd->request_buffer, cmd->request_bufflen);
90         }
91     }
92
93     /* setup dma direction */
94     if (!dir_in)
95         cntr |= CNTR_DDIR;
96
97     /* remember direction */
98     HDATA(cmd->device->host)->dma_dir = dir_in;
99
100     DMA(cmd->device->host)->CNTR = cntr;
101
102     /* setup DMA *physical* address */
103     DMA(cmd->device->host)->ACR = addr;
104
105     if (dir_in){
106         /* invalidate any cache */
107         cache_clear (addr, cmd->SCp.this_residual);
108     }else{
109         /* push any dirty cache */
110         cache_push (addr, cmd->SCp.this_residual);
111       }
112     /* start DMA */
113     DMA(cmd->device->host)->ST_DMA = 1;
114
115     /* return success */
116     return 0;
117 }
118
119 static void dma_stop (struct Scsi_Host *instance, Scsi_Cmnd *SCpnt, 
120                       int status)
121 {
122     /* disable SCSI interrupts */
123     unsigned short cntr = CNTR_PDMD;
124
125     if (!HDATA(instance)->dma_dir)
126             cntr |= CNTR_DDIR;
127
128     /* disable SCSI interrupts */
129     DMA(instance)->CNTR = cntr;
130
131     /* flush if we were reading */
132     if (HDATA(instance)->dma_dir) {
133         DMA(instance)->FLUSH = 1;
134         while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
135             ;
136     }
137
138     /* clear a possible interrupt */
139     DMA(instance)->CINT = 1;
140
141     /* stop DMA */
142     DMA(instance)->SP_DMA = 1;
143
144     /* restore the CONTROL bits (minus the direction flag) */
145     DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
146
147     /* copy from a bounce buffer, if necessary */
148     if (status && HDATA(instance)->dma_bounce_buffer) {
149         if (SCpnt && SCpnt->use_sg) {
150 #if 0
151             panic ("scsi%d: incomplete s/g support",
152                    instance->host_no);
153 #else
154             if( HDATA(instance)->dma_dir )
155                 memcpy (SCpnt->SCp.ptr, 
156                         HDATA(instance)->dma_bounce_buffer,
157                         SCpnt->SCp.this_residual);
158             kfree (HDATA(instance)->dma_bounce_buffer);
159             HDATA(instance)->dma_bounce_buffer = NULL;
160             HDATA(instance)->dma_bounce_len = 0;
161             
162 #endif
163         } else {
164             if (HDATA(instance)->dma_dir && SCpnt)
165                 memcpy (SCpnt->request_buffer,
166                         HDATA(instance)->dma_bounce_buffer,
167                         SCpnt->request_bufflen);
168
169             kfree (HDATA(instance)->dma_bounce_buffer);
170             HDATA(instance)->dma_bounce_buffer = NULL;
171             HDATA(instance)->dma_bounce_len = 0;
172         }
173     }
174 }
175
176 int __init a2091_detect(Scsi_Host_Template *tpnt)
177 {
178     static unsigned char called = 0;
179     struct Scsi_Host *instance;
180     unsigned long address;
181     struct zorro_dev *z = NULL;
182     wd33c93_regs regs;
183     int num_a2091 = 0;
184
185     if (!MACH_IS_AMIGA || called)
186         return 0;
187     called = 1;
188
189     tpnt->proc_name = "A2091";
190     tpnt->proc_info = &wd33c93_proc_info;
191
192     while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
193         if (z->id != ZORRO_PROD_CBM_A590_A2091_1 &&
194             z->id != ZORRO_PROD_CBM_A590_A2091_2)
195             continue;
196         address = z->resource.start;
197         if (!request_mem_region(address, 256, "wd33c93"))
198             continue;
199
200         instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata));
201         if (instance == NULL) {
202             release_mem_region(address, 256);
203             continue;
204         }
205         instance->base = ZTWO_VADDR(address);
206         instance->irq = IRQ_AMIGA_PORTS;
207         instance->unique_id = z->slotaddr;
208         DMA(instance)->DAWR = DAWR_A2091;
209         regs.SASR = &(DMA(instance)->SASR);
210         regs.SCMD = &(DMA(instance)->SCMD);
211         wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
212         request_irq(IRQ_AMIGA_PORTS, a2091_intr, SA_SHIRQ, "A2091 SCSI",
213                     instance);
214         DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
215         num_a2091++;
216     }
217
218     return num_a2091;
219 }
220
221 static int a2091_bus_reset(Scsi_Cmnd *cmd)
222 {
223         /* FIXME perform bus-specific reset */
224
225         /* FIXME 2: kill this function, and let midlayer fall back
226            to the same action, calling wd33c93_host_reset() */
227
228         spin_lock_irq(cmd->device->host->host_lock);
229         wd33c93_host_reset(cmd);
230         spin_unlock_irq(cmd->device->host->host_lock);
231
232         return SUCCESS;
233 }
234
235 #define HOSTS_C
236
237 static Scsi_Host_Template driver_template = {
238         .proc_name              = "A2901",
239         .name                   = "Commodore A2091/A590 SCSI",
240         .detect                 = a2091_detect,
241         .release                = a2091_release,
242         .queuecommand           = wd33c93_queuecommand,
243         .eh_abort_handler       = wd33c93_abort,
244         .eh_bus_reset_handler   = a2091_bus_reset,
245         .eh_host_reset_handler  = wd33c93_host_reset,
246         .can_queue              = CAN_QUEUE,
247         .this_id                = 7,
248         .sg_tablesize           = SG_ALL,
249         .cmd_per_lun            = CMD_PER_LUN,
250         .use_clustering         = DISABLE_CLUSTERING
251 };
252
253
254 #include "scsi_module.c"
255
256 int a2091_release(struct Scsi_Host *instance)
257 {
258 #ifdef MODULE
259         DMA(instance)->CNTR = 0;
260         release_mem_region(ZTWO_PADDR(instance->base), 256);
261         free_irq(IRQ_AMIGA_PORTS, instance);
262         wd33c93_release();
263 #endif
264         return 1;
265 }
266
267 MODULE_LICENSE("GPL");