1 #include <linux/types.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>
11 #include <asm/pgtable.h>
12 #include <asm/amigaints.h>
13 #include <asm/amigahw.h>
17 #include <scsi/scsi_host.h>
21 #include<linux/stat.h>
23 #define DMA(ptr) ((a3000_scsiregs *)((ptr)->base))
24 #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
26 static struct Scsi_Host *a3000_host = NULL;
28 static irqreturn_t a3000_intr (int irq, void *dummy)
31 unsigned int status = DMA(a3000_host)->ISTR;
33 if (!(status & ISTR_INT_P))
35 if (status & ISTR_INTS)
37 spin_lock_irqsave(a3000_host->host_lock, flags);
38 wd33c93_intr (a3000_host);
39 spin_unlock_irqrestore(a3000_host->host_lock, flags);
42 printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
46 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
48 unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
49 unsigned long addr = virt_to_bus(cmd->SCp.ptr);
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
57 if (addr & A3000_XFER_MASK)
59 HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
61 HDATA(a3000_host)->dma_bounce_buffer =
62 kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL);
64 /* can't allocate memory; use PIO */
65 if (!HDATA(a3000_host)->dma_bounce_buffer) {
66 HDATA(a3000_host)->dma_bounce_len = 0;
71 /* copy to bounce buffer for a write */
72 memcpy (HDATA(a3000_host)->dma_bounce_buffer,
73 cmd->SCp.ptr, cmd->SCp.this_residual);
76 addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
79 /* setup dma direction */
83 /* remember direction */
84 HDATA(a3000_host)->dma_dir = dir_in;
86 DMA(a3000_host)->CNTR = cntr;
88 /* setup DMA *physical* address */
89 DMA(a3000_host)->ACR = addr;
92 /* invalidate any cache */
93 cache_clear (addr, cmd->SCp.this_residual);
95 /* push any dirty cache */
96 cache_push (addr, cmd->SCp.this_residual);
99 mb(); /* make sure setup is completed */
100 DMA(a3000_host)->ST_DMA = 1;
101 mb(); /* make sure DMA has started before next IO */
107 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
110 /* disable SCSI interrupts */
111 unsigned short cntr = CNTR_PDMD;
113 if (!HDATA(instance)->dma_dir)
116 DMA(instance)->CNTR = cntr;
117 mb(); /* make sure CNTR is updated before next IO */
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))
125 mb(); /* no IO until FLUSH is done */
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
132 DMA(instance)->CINT = 1;
135 DMA(instance)->SP_DMA = 1;
136 mb(); /* make sure DMA is stopped before next IO */
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 */
142 /* copy from a bounce buffer, if necessary */
143 if (status && HDATA(instance)->dma_bounce_buffer) {
145 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;
153 kfree (HDATA(instance)->dma_bounce_buffer);
154 HDATA(instance)->dma_bounce_buffer = NULL;
155 HDATA(instance)->dma_bounce_len = 0;
160 int __init a3000_detect(struct scsi_host_template *tpnt)
164 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
166 if (!request_mem_region(0xDD0000, 256, "wd33c93"))
169 tpnt->proc_name = "A3000";
170 tpnt->proc_info = &wd33c93_proc_info;
172 a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
173 if (a3000_host == NULL)
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);
181 wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
182 if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
185 DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;
191 scsi_unregister(a3000_host);
193 release_mem_region(0xDD0000, 256);
197 static int a3000_bus_reset(struct scsi_cmnd *cmd)
199 /* FIXME perform bus-specific reset */
201 /* FIXME 2: kill this entire function, which should
202 cause mid-layer to call wd33c93_host_reset anyway? */
204 spin_lock_irq(cmd->device->host->host_lock);
205 wd33c93_host_reset(cmd);
206 spin_unlock_irq(cmd->device->host->host_lock);
213 static struct scsi_host_template driver_template = {
214 .proc_name = "A3000",
215 .name = "Amiga 3000 built-in SCSI",
216 .detect = a3000_detect,
217 .release = a3000_release,
218 .queuecommand = wd33c93_queuecommand,
219 .eh_abort_handler = wd33c93_abort,
220 .eh_bus_reset_handler = a3000_bus_reset,
221 .eh_host_reset_handler = wd33c93_host_reset,
222 .can_queue = CAN_QUEUE,
224 .sg_tablesize = SG_ALL,
225 .cmd_per_lun = CMD_PER_LUN,
226 .use_clustering = ENABLE_CLUSTERING
230 #include "scsi_module.c"
232 int a3000_release(struct Scsi_Host *instance)
235 DMA(instance)->CNTR = 0;
236 release_mem_region(0xDD0000, 256);
237 free_irq(IRQ_AMIGA_PORTS, a3000_intr);
241 MODULE_LICENSE("GPL");