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