blob: 8b449d8acacdb4f249cfa80480a94c9e8cff4cc3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#include <linux/types.h>
2#include <linux/mm.h>
3#include <linux/blkdev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004#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
26static struct Scsi_Host *a3000_host = NULL;
27
David Howells7d12e782006-10-05 14:55:46 +010028static irqreturn_t a3000_intr (int irq, void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -070029{
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
Henrik Kretzschmar65396412006-09-12 23:49:33 +020046static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
Linus Torvalds1da177e2005-04-16 15:20:36 -070047{
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 */
Adrian Bunk7b892802008-02-06 01:36:29 -080057 if (addr & A3000_XFER_MASK)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 {
59 HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
60 & ~0x1ff;
61 HDATA(a3000_host)->dma_bounce_buffer =
62 kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL);
63
64 /* can't allocate memory; use PIO */
65 if (!HDATA(a3000_host)->dma_bounce_buffer) {
66 HDATA(a3000_host)->dma_bounce_len = 0;
67 return 1;
68 }
69
70 if (!dir_in) {
71 /* copy to bounce buffer for a write */
Boaz Harroshcc0455f2007-09-09 20:59:32 +030072 memcpy (HDATA(a3000_host)->dma_bounce_buffer,
73 cmd->SCp.ptr, cmd->SCp.this_residual);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 }
75
76 addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
77 }
78
79 /* setup dma direction */
80 if (!dir_in)
81 cntr |= CNTR_DDIR;
82
83 /* remember direction */
84 HDATA(a3000_host)->dma_dir = dir_in;
85
86 DMA(a3000_host)->CNTR = cntr;
87
88 /* setup DMA *physical* address */
89 DMA(a3000_host)->ACR = addr;
90
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);
97
98 /* start DMA */
99 mb(); /* make sure setup is completed */
100 DMA(a3000_host)->ST_DMA = 1;
101 mb(); /* make sure DMA has started before next IO */
102
103 /* return success */
104 return 0;
105}
106
Henrik Kretzschmar65396412006-09-12 23:49:33 +0200107static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
108 int status)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109{
110 /* disable SCSI interrupts */
111 unsigned short cntr = CNTR_PDMD;
112
113 if (!HDATA(instance)->dma_dir)
114 cntr |= CNTR_DDIR;
115
116 DMA(instance)->CNTR = cntr;
117 mb(); /* make sure CNTR is updated before next IO */
118
119 /* flush if we were reading */
120 if (HDATA(instance)->dma_dir) {
121 DMA(instance)->FLUSH = 1;
122 mb(); /* don't allow prefetch */
123 while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
124 barrier();
125 mb(); /* no IO until FLUSH is done */
126 }
127
128 /* clear a possible interrupt */
129 /* I think that this CINT is only necessary if you are
130 * using the terminal count features. HM 7 Mar 1994
131 */
132 DMA(instance)->CINT = 1;
133
134 /* stop DMA */
135 DMA(instance)->SP_DMA = 1;
136 mb(); /* make sure DMA is stopped before next IO */
137
138 /* restore the CONTROL bits (minus the direction flag) */
139 DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
140 mb(); /* make sure CNTR is updated before next IO */
141
142 /* copy from a bounce buffer, if necessary */
143 if (status && HDATA(instance)->dma_bounce_buffer) {
Boaz Harroshcc0455f2007-09-09 20:59:32 +0300144 if (SCpnt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 if (HDATA(instance)->dma_dir && SCpnt)
146 memcpy (SCpnt->SCp.ptr,
147 HDATA(instance)->dma_bounce_buffer,
148 SCpnt->SCp.this_residual);
149 kfree (HDATA(instance)->dma_bounce_buffer);
150 HDATA(instance)->dma_bounce_buffer = NULL;
151 HDATA(instance)->dma_bounce_len = 0;
152 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 kfree (HDATA(instance)->dma_bounce_buffer);
154 HDATA(instance)->dma_bounce_buffer = NULL;
155 HDATA(instance)->dma_bounce_len = 0;
156 }
157 }
158}
159
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +0100160int __init a3000_detect(struct scsi_host_template *tpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161{
162 wd33c93_regs regs;
163
164 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
165 return 0;
166 if (!request_mem_region(0xDD0000, 256, "wd33c93"))
167 return 0;
168
169 tpnt->proc_name = "A3000";
170 tpnt->proc_info = &wd33c93_proc_info;
171
172 a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
173 if (a3000_host == NULL)
174 goto fail_register;
175
176 a3000_host->base = ZTWO_VADDR(0xDD0000);
177 a3000_host->irq = IRQ_AMIGA_PORTS;
178 DMA(a3000_host)->DAWR = DAWR_A3000;
179 regs.SASR = &(DMA(a3000_host)->SASR);
180 regs.SCMD = &(DMA(a3000_host)->SCMD);
Thomas Bogendoerferbe3cb3d2008-03-21 22:25:43 +0100181 HDATA(a3000_host)->no_sync = 0xff;
182 HDATA(a3000_host)->fast = 0;
183 HDATA(a3000_host)->dma_mode = CTRL_DMA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
Thomas Gleixner1d6f3592006-07-01 19:29:42 -0700185 if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 a3000_intr))
187 goto fail_irq;
188 DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;
189
190 return 1;
191
192fail_irq:
193 wd33c93_release();
194 scsi_unregister(a3000_host);
195fail_register:
196 release_mem_region(0xDD0000, 256);
197 return 0;
198}
199
Henrik Kretzschmar65396412006-09-12 23:49:33 +0200200static int a3000_bus_reset(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201{
202 /* FIXME perform bus-specific reset */
Jeff Garzik df0ae242005-05-28 07:57:14 -0400203
204 /* FIXME 2: kill this entire function, which should
205 cause mid-layer to call wd33c93_host_reset anyway? */
Jeff Garzik 68b3aa72005-05-28 07:56:31 -0400206
207 spin_lock_irq(cmd->device->host->host_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 wd33c93_host_reset(cmd);
Jeff Garzik 68b3aa72005-05-28 07:56:31 -0400209 spin_unlock_irq(cmd->device->host->host_lock);
210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 return SUCCESS;
212}
213
214#define HOSTS_C
215
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +0100216static struct scsi_host_template driver_template = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 .proc_name = "A3000",
218 .name = "Amiga 3000 built-in SCSI",
219 .detect = a3000_detect,
220 .release = a3000_release,
221 .queuecommand = wd33c93_queuecommand,
222 .eh_abort_handler = wd33c93_abort,
223 .eh_bus_reset_handler = a3000_bus_reset,
224 .eh_host_reset_handler = wd33c93_host_reset,
225 .can_queue = CAN_QUEUE,
226 .this_id = 7,
227 .sg_tablesize = SG_ALL,
228 .cmd_per_lun = CMD_PER_LUN,
229 .use_clustering = ENABLE_CLUSTERING
230};
231
232
233#include "scsi_module.c"
234
235int a3000_release(struct Scsi_Host *instance)
236{
237 wd33c93_release();
238 DMA(instance)->CNTR = 0;
239 release_mem_region(0xDD0000, 256);
240 free_irq(IRQ_AMIGA_PORTS, a3000_intr);
241 return 1;
242}
243
244MODULE_LICENSE("GPL");