1 #include <linux/types.h>
3 #include <linux/slab.h>
4 #include <linux/blkdev.h>
5 #include <linux/ioport.h>
6 #include <linux/init.h>
7 #include <linux/spinlock.h>
8 #include <linux/interrupt.h>
10 #include <asm/setup.h>
12 #include <asm/pgtable.h>
13 #include <asm/amigaints.h>
14 #include <asm/amigahw.h>
18 #include <scsi/scsi_host.h>
22 #include <linux/stat.h>
25 #define DMA(ptr) ((a3000_scsiregs *)((ptr)->base))
27 static struct Scsi_Host *a3000_host = NULL;
29 static int a3000_release(struct Scsi_Host *instance);
31 static irqreturn_t a3000_intr(int irq, void *dummy)
34 unsigned int status = DMA(a3000_host)->ISTR;
36 if (!(status & ISTR_INT_P))
38 if (status & ISTR_INTS) {
39 spin_lock_irqsave(a3000_host->host_lock, flags);
40 wd33c93_intr(a3000_host);
41 spin_unlock_irqrestore(a3000_host->host_lock, flags);
44 printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
48 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
50 struct WD33C93_hostdata *hdata = shost_priv(a3000_host);
51 unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
52 unsigned long addr = virt_to_bus(cmd->SCp.ptr);
55 * if the physical address has the wrong alignment, or if
56 * physical address is bad, or if it is a write and at the
57 * end of a physical memory chunk, then allocate a bounce
60 if (addr & A3000_XFER_MASK) {
61 hdata->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
62 hdata->dma_bounce_buffer = kmalloc(hdata->dma_bounce_len,
65 /* can't allocate memory; use PIO */
66 if (!hdata->dma_bounce_buffer) {
67 hdata->dma_bounce_len = 0;
72 /* copy to bounce buffer for a write */
73 memcpy(hdata->dma_bounce_buffer, cmd->SCp.ptr,
74 cmd->SCp.this_residual);
77 addr = virt_to_bus(hdata->dma_bounce_buffer);
80 /* setup dma direction */
84 /* remember direction */
85 hdata->dma_dir = dir_in;
87 DMA(a3000_host)->CNTR = cntr;
89 /* setup DMA *physical* address */
90 DMA(a3000_host)->ACR = addr;
93 /* invalidate any cache */
94 cache_clear(addr, cmd->SCp.this_residual);
96 /* push any dirty cache */
97 cache_push(addr, cmd->SCp.this_residual);
101 mb(); /* make sure setup is completed */
102 DMA(a3000_host)->ST_DMA = 1;
103 mb(); /* make sure DMA has started before next IO */
109 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
112 struct WD33C93_hostdata *hdata = shost_priv(instance);
114 /* disable SCSI interrupts */
115 unsigned short cntr = CNTR_PDMD;
120 DMA(instance)->CNTR = cntr;
121 mb(); /* make sure CNTR is updated before next IO */
123 /* flush if we were reading */
124 if (hdata->dma_dir) {
125 DMA(instance)->FLUSH = 1;
126 mb(); /* don't allow prefetch */
127 while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
129 mb(); /* no IO until FLUSH is done */
132 /* clear a possible interrupt */
133 /* I think that this CINT is only necessary if you are
134 * using the terminal count features. HM 7 Mar 1994
136 DMA(instance)->CINT = 1;
139 DMA(instance)->SP_DMA = 1;
140 mb(); /* make sure DMA is stopped before next IO */
142 /* restore the CONTROL bits (minus the direction flag) */
143 DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
144 mb(); /* make sure CNTR is updated before next IO */
146 /* copy from a bounce buffer, if necessary */
147 if (status && hdata->dma_bounce_buffer) {
149 if (hdata->dma_dir && SCpnt)
150 memcpy(SCpnt->SCp.ptr,
151 hdata->dma_bounce_buffer,
152 SCpnt->SCp.this_residual);
153 kfree(hdata->dma_bounce_buffer);
154 hdata->dma_bounce_buffer = NULL;
155 hdata->dma_bounce_len = 0;
157 kfree(hdata->dma_bounce_buffer);
158 hdata->dma_bounce_buffer = NULL;
159 hdata->dma_bounce_len = 0;
164 static int __init a3000_detect(struct scsi_host_template *tpnt)
167 struct WD33C93_hostdata *hdata;
169 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
171 if (!request_mem_region(0xDD0000, 256, "wd33c93"))
174 tpnt->proc_name = "A3000";
175 tpnt->proc_info = &wd33c93_proc_info;
177 a3000_host = scsi_register(tpnt, sizeof(struct WD33C93_hostdata));
178 if (a3000_host == NULL)
181 a3000_host->base = ZTWO_VADDR(0xDD0000);
182 a3000_host->irq = IRQ_AMIGA_PORTS;
183 DMA(a3000_host)->DAWR = DAWR_A3000;
184 regs.SASR = &(DMA(a3000_host)->SASR);
185 regs.SCMD = &(DMA(a3000_host)->SCMD);
186 hdata = shost_priv(a3000_host);
187 hdata->no_sync = 0xff;
189 hdata->dma_mode = CTRL_DMA;
190 wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
191 if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
194 DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;
199 scsi_unregister(a3000_host);
201 release_mem_region(0xDD0000, 256);
205 static int a3000_bus_reset(struct scsi_cmnd *cmd)
207 /* FIXME perform bus-specific reset */
209 /* FIXME 2: kill this entire function, which should
210 cause mid-layer to call wd33c93_host_reset anyway? */
212 spin_lock_irq(cmd->device->host->host_lock);
213 wd33c93_host_reset(cmd);
214 spin_unlock_irq(cmd->device->host->host_lock);
221 static struct scsi_host_template driver_template = {
222 .proc_name = "A3000",
223 .name = "Amiga 3000 built-in SCSI",
224 .detect = a3000_detect,
225 .release = a3000_release,
226 .queuecommand = wd33c93_queuecommand,
227 .eh_abort_handler = wd33c93_abort,
228 .eh_bus_reset_handler = a3000_bus_reset,
229 .eh_host_reset_handler = wd33c93_host_reset,
230 .can_queue = CAN_QUEUE,
232 .sg_tablesize = SG_ALL,
233 .cmd_per_lun = CMD_PER_LUN,
234 .use_clustering = ENABLE_CLUSTERING
238 #include "scsi_module.c"
240 static int a3000_release(struct Scsi_Host *instance)
242 DMA(instance)->CNTR = 0;
243 release_mem_region(0xDD0000, 256);
244 free_irq(IRQ_AMIGA_PORTS, a3000_intr);
248 MODULE_LICENSE("GPL");