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 int a3000_release(struct Scsi_Host *instance);
29
30 static irqreturn_t a3000_intr (int irq, void *dummy)
31 {
32 unsigned long flags;
33 unsigned int status = DMA(a3000_host)->ISTR;
34
35 if (!(status & ISTR_INT_P))
36 return IRQ_NONE;
37 if (status & ISTR_INTS)
38 {
39 spin_lock_irqsave(a3000_host->host_lock, flags);
40 wd33c93_intr (a3000_host);
41 spin_unlock_irqrestore(a3000_host->host_lock, flags);
42 return IRQ_HANDLED;
43 }
44 printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
45 return IRQ_NONE;
46 }
47
48 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
49 {
50 unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
51 unsigned long addr = virt_to_bus(cmd->SCp.ptr);
52
53 /*
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
58 */
59 if (addr & A3000_XFER_MASK)
60 {
61 HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
62 & ~0x1ff;
63 HDATA(a3000_host)->dma_bounce_buffer =
64 kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL);
65
66 /* can't allocate memory; use PIO */
67 if (!HDATA(a3000_host)->dma_bounce_buffer) {
68 HDATA(a3000_host)->dma_bounce_len = 0;
69 return 1;
70 }
71
72 if (!dir_in) {
73 /* copy to bounce buffer for a write */
74 memcpy (HDATA(a3000_host)->dma_bounce_buffer,
75 cmd->SCp.ptr, cmd->SCp.this_residual);
76 }
77
78 addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
79 }
80
81 /* setup dma direction */
82 if (!dir_in)
83 cntr |= CNTR_DDIR;
84
85 /* remember direction */
86 HDATA(a3000_host)->dma_dir = dir_in;
87
88 DMA(a3000_host)->CNTR = cntr;
89
90 /* setup DMA *physical* address */
91 DMA(a3000_host)->ACR = addr;
92
93 if (dir_in)
94 /* invalidate any cache */
95 cache_clear (addr, cmd->SCp.this_residual);
96 else
97 /* push any dirty cache */
98 cache_push (addr, cmd->SCp.this_residual);
99
100 /* start DMA */
101 mb(); /* make sure setup is completed */
102 DMA(a3000_host)->ST_DMA = 1;
103 mb(); /* make sure DMA has started before next IO */
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 DMA(instance)->CNTR = cntr;
119 mb(); /* make sure CNTR is updated before next IO */
120
121 /* flush if we were reading */
122 if (HDATA(instance)->dma_dir) {
123 DMA(instance)->FLUSH = 1;
124 mb(); /* don't allow prefetch */
125 while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
126 barrier();
127 mb(); /* no IO until FLUSH is done */
128 }
129
130 /* clear a possible interrupt */
131 /* I think that this CINT is only necessary if you are
132 * using the terminal count features. HM 7 Mar 1994
133 */
134 DMA(instance)->CINT = 1;
135
136 /* stop DMA */
137 DMA(instance)->SP_DMA = 1;
138 mb(); /* make sure DMA is stopped before next IO */
139
140 /* restore the CONTROL bits (minus the direction flag) */
141 DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
142 mb(); /* make sure CNTR is updated before next IO */
143
144 /* copy from a bounce buffer, if necessary */
145 if (status && HDATA(instance)->dma_bounce_buffer) {
146 if (SCpnt) {
147 if (HDATA(instance)->dma_dir && SCpnt)
148 memcpy (SCpnt->SCp.ptr,
149 HDATA(instance)->dma_bounce_buffer,
150 SCpnt->SCp.this_residual);
151 kfree (HDATA(instance)->dma_bounce_buffer);
152 HDATA(instance)->dma_bounce_buffer = NULL;
153 HDATA(instance)->dma_bounce_len = 0;
154 } else {
155 kfree (HDATA(instance)->dma_bounce_buffer);
156 HDATA(instance)->dma_bounce_buffer = NULL;
157 HDATA(instance)->dma_bounce_len = 0;
158 }
159 }
160 }
161
162 static int __init a3000_detect(struct scsi_host_template *tpnt)
163 {
164 wd33c93_regs regs;
165
166 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
167 return 0;
168 if (!request_mem_region(0xDD0000, 256, "wd33c93"))
169 return 0;
170
171 tpnt->proc_name = "A3000";
172 tpnt->proc_info = &wd33c93_proc_info;
173
174 a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
175 if (a3000_host == NULL)
176 goto fail_register;
177
178 a3000_host->base = ZTWO_VADDR(0xDD0000);
179 a3000_host->irq = IRQ_AMIGA_PORTS;
180 DMA(a3000_host)->DAWR = DAWR_A3000;
181 regs.SASR = &(DMA(a3000_host)->SASR);
182 regs.SCMD = &(DMA(a3000_host)->SCMD);
183 HDATA(a3000_host)->no_sync = 0xff;
184 HDATA(a3000_host)->fast = 0;
185 HDATA(a3000_host)->dma_mode = CTRL_DMA;
186 wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
187 if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
188 a3000_intr))
189 goto fail_irq;
190 DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;
191
192 return 1;
193
194 fail_irq:
195 wd33c93_release();
196 scsi_unregister(a3000_host);
197 fail_register:
198 release_mem_region(0xDD0000, 256);
199 return 0;
200 }
201
202 static int a3000_bus_reset(struct scsi_cmnd *cmd)
203 {
204 /* FIXME perform bus-specific reset */
205
206 /* FIXME 2: kill this entire function, which should
207 cause mid-layer to call wd33c93_host_reset anyway? */
208
209 spin_lock_irq(cmd->device->host->host_lock);
210 wd33c93_host_reset(cmd);
211 spin_unlock_irq(cmd->device->host->host_lock);
212
213 return SUCCESS;
214 }
215
216 #define HOSTS_C
217
218 static struct scsi_host_template driver_template = {
219 .proc_name = "A3000",
220 .name = "Amiga 3000 built-in SCSI",
221 .detect = a3000_detect,
222 .release = a3000_release,
223 .queuecommand = wd33c93_queuecommand,
224 .eh_abort_handler = wd33c93_abort,
225 .eh_bus_reset_handler = a3000_bus_reset,
226 .eh_host_reset_handler = wd33c93_host_reset,
227 .can_queue = CAN_QUEUE,
228 .this_id = 7,
229 .sg_tablesize = SG_ALL,
230 .cmd_per_lun = CMD_PER_LUN,
231 .use_clustering = ENABLE_CLUSTERING
232 };
233
234
235 #include "scsi_module.c"
236
237 static int a3000_release(struct Scsi_Host *instance)
238 {
239 wd33c93_release();
240 DMA(instance)->CNTR = 0;
241 release_mem_region(0xDD0000, 256);
242 free_irq(IRQ_AMIGA_PORTS, a3000_intr);
243 return 1;
244 }
245
246 MODULE_LICENSE("GPL");
247
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