Merge branch 'master' into upstream
[linux-2.6] / drivers / scsi / a3000.c
1 #include <linux/types.h>
2 #include <linux/mm.h>
3 #include <linux/blkdev.h>
4 #include <linux/ioport.h>
5 #include <linux/init.h>
6 #include <linux/spinlock.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 <asm/irq.h>
15
16 #include "scsi.h"
17 #include <scsi/scsi_host.h>
18 #include "wd33c93.h"
19 #include "a3000.h"
20
21 #include<linux/stat.h>
22
23 #define DMA(ptr) ((a3000_scsiregs *)((ptr)->base))
24 #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
25
26 static struct Scsi_Host *a3000_host = NULL;
27
28 static irqreturn_t a3000_intr (int irq, void *dummy)
29 {
30         unsigned long flags;
31         unsigned int status = DMA(a3000_host)->ISTR;
32
33         if (!(status & ISTR_INT_P))
34                 return IRQ_NONE;
35         if (status & ISTR_INTS)
36         {
37                 spin_lock_irqsave(a3000_host->host_lock, flags);
38                 wd33c93_intr (a3000_host);
39                 spin_unlock_irqrestore(a3000_host->host_lock, flags);
40                 return IRQ_HANDLED;
41         }
42         printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
43         return IRQ_NONE;
44 }
45
46 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
47 {
48     unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
49     unsigned long addr = virt_to_bus(cmd->SCp.ptr);
50
51     /*
52      * if the physical address has the wrong alignment, or if
53      * physical address is bad, or if it is a write and at the
54      * end of a physical memory chunk, then allocate a bounce
55      * buffer
56      */
57     if (addr & A3000_XFER_MASK ||
58         (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
59     {
60         HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
61             & ~0x1ff;
62         HDATA(a3000_host)->dma_bounce_buffer =
63             kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL);
64         
65         /* can't allocate memory; use PIO */
66         if (!HDATA(a3000_host)->dma_bounce_buffer) {
67             HDATA(a3000_host)->dma_bounce_len = 0;
68             return 1;
69         }
70
71         if (!dir_in) {
72             /* copy to bounce buffer for a write */
73             if (cmd->use_sg) {
74                 memcpy (HDATA(a3000_host)->dma_bounce_buffer,
75                         cmd->SCp.ptr, cmd->SCp.this_residual);
76             } else
77                 memcpy (HDATA(a3000_host)->dma_bounce_buffer,
78                         cmd->request_buffer, cmd->request_bufflen);
79         }
80
81         addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
82     }
83
84     /* setup dma direction */
85     if (!dir_in)
86         cntr |= CNTR_DDIR;
87
88     /* remember direction */
89     HDATA(a3000_host)->dma_dir = dir_in;
90
91     DMA(a3000_host)->CNTR = cntr;
92
93     /* setup DMA *physical* address */
94     DMA(a3000_host)->ACR = addr;
95
96     if (dir_in)
97         /* invalidate any cache */
98         cache_clear (addr, cmd->SCp.this_residual);
99     else
100         /* push any dirty cache */
101         cache_push (addr, cmd->SCp.this_residual);
102
103     /* start DMA */
104     mb();                       /* make sure setup is completed */
105     DMA(a3000_host)->ST_DMA = 1;
106     mb();                       /* make sure DMA has started before next IO */
107
108     /* return success */
109     return 0;
110 }
111
112 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
113                      int status)
114 {
115     /* disable SCSI interrupts */
116     unsigned short cntr = CNTR_PDMD;
117
118     if (!HDATA(instance)->dma_dir)
119         cntr |= CNTR_DDIR;
120
121     DMA(instance)->CNTR = cntr;
122     mb();                       /* make sure CNTR is updated before next IO */
123
124     /* flush if we were reading */
125     if (HDATA(instance)->dma_dir) {
126         DMA(instance)->FLUSH = 1;
127         mb();                   /* don't allow prefetch */
128         while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
129             barrier();
130         mb();                   /* no IO until FLUSH is done */
131     }
132
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
136      */
137     DMA(instance)->CINT = 1;
138
139     /* stop DMA */
140     DMA(instance)->SP_DMA = 1;
141     mb();                       /* make sure DMA is stopped before next IO */
142
143     /* restore the CONTROL bits (minus the direction flag) */
144     DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
145     mb();                       /* make sure CNTR is updated before next IO */
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 (HDATA(instance)->dma_dir && SCpnt)
151                 memcpy (SCpnt->SCp.ptr,
152                         HDATA(instance)->dma_bounce_buffer,
153                         SCpnt->SCp.this_residual);
154             kfree (HDATA(instance)->dma_bounce_buffer);
155             HDATA(instance)->dma_bounce_buffer = NULL;
156             HDATA(instance)->dma_bounce_len = 0;
157         } else {
158             if (HDATA(instance)->dma_dir && SCpnt)
159                 memcpy (SCpnt->request_buffer,
160                         HDATA(instance)->dma_bounce_buffer,
161                         SCpnt->request_bufflen);
162
163             kfree (HDATA(instance)->dma_bounce_buffer);
164             HDATA(instance)->dma_bounce_buffer = NULL;
165             HDATA(instance)->dma_bounce_len = 0;
166         }
167     }
168 }
169
170 int __init a3000_detect(struct scsi_host_template *tpnt)
171 {
172     wd33c93_regs regs;
173
174     if  (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
175         return 0;
176     if (!request_mem_region(0xDD0000, 256, "wd33c93"))
177         return 0;
178
179     tpnt->proc_name = "A3000";
180     tpnt->proc_info = &wd33c93_proc_info;
181
182     a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
183     if (a3000_host == NULL)
184         goto fail_register;
185
186     a3000_host->base = ZTWO_VADDR(0xDD0000);
187     a3000_host->irq = IRQ_AMIGA_PORTS;
188     DMA(a3000_host)->DAWR = DAWR_A3000;
189     regs.SASR = &(DMA(a3000_host)->SASR);
190     regs.SCMD = &(DMA(a3000_host)->SCMD);
191     wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
192     if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
193                     a3000_intr))
194         goto fail_irq;
195     DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;
196
197     return 1;
198
199 fail_irq:
200     wd33c93_release();
201     scsi_unregister(a3000_host);
202 fail_register:
203     release_mem_region(0xDD0000, 256);
204     return 0;
205 }
206
207 static int a3000_bus_reset(struct scsi_cmnd *cmd)
208 {
209         /* FIXME perform bus-specific reset */
210         
211         /* FIXME 2: kill this entire function, which should
212            cause mid-layer to call wd33c93_host_reset anyway? */
213
214         spin_lock_irq(cmd->device->host->host_lock);
215         wd33c93_host_reset(cmd);
216         spin_unlock_irq(cmd->device->host->host_lock);
217
218         return SUCCESS;
219 }
220
221 #define HOSTS_C
222
223 static struct scsi_host_template driver_template = {
224         .proc_name              = "A3000",
225         .name                   = "Amiga 3000 built-in SCSI",
226         .detect                 = a3000_detect,
227         .release                = a3000_release,
228         .queuecommand           = wd33c93_queuecommand,
229         .eh_abort_handler       = wd33c93_abort,
230         .eh_bus_reset_handler   = a3000_bus_reset,
231         .eh_host_reset_handler  = wd33c93_host_reset,
232         .can_queue              = CAN_QUEUE,
233         .this_id                = 7,
234         .sg_tablesize           = SG_ALL,
235         .cmd_per_lun            = CMD_PER_LUN,
236         .use_clustering         = ENABLE_CLUSTERING
237 };
238
239
240 #include "scsi_module.c"
241
242 int a3000_release(struct Scsi_Host *instance)
243 {
244     wd33c93_release();
245     DMA(instance)->CNTR = 0;
246     release_mem_region(0xDD0000, 256);
247     free_irq(IRQ_AMIGA_PORTS, a3000_intr);
248     return 1;
249 }
250
251 MODULE_LICENSE("GPL");