a3000.c revision df0ae2497ddefd72a87f3a3b34ff32455d7d4ae0 
1#include <linux/types.h>
2#include <linux/mm.h>
3#include <linux/blkdev.h>
4#include <linux/sched.h>
5#include <linux/ioport.h>
6#include <linux/init.h>
7#include <linux/spinlock.h>
8#include <linux/interrupt.h>
9
10#include <asm/setup.h>
11#include <asm/page.h>
12#include <asm/pgtable.h>
13#include <asm/amigaints.h>
14#include <asm/amigahw.h>
15#include <asm/irq.h>
16
17#include "scsi.h"
18#include <scsi/scsi_host.h>
19#include "wd33c93.h"
20#include "a3000.h"
21
22#include<linux/stat.h>
23
24#define DMA(ptr) ((a3000_scsiregs *)((ptr)->base))
25#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
26
27static struct Scsi_Host *a3000_host = NULL;
28
29static irqreturn_t a3000_intr (int irq, void *dummy, struct pt_regs *fp)
30{
31	unsigned long flags;
32	unsigned int status = DMA(a3000_host)->ISTR;
33
34	if (!(status & ISTR_INT_P))
35		return IRQ_NONE;
36	if (status & ISTR_INTS)
37	{
38		spin_lock_irqsave(a3000_host->host_lock, flags);
39		wd33c93_intr (a3000_host);
40		spin_unlock_irqrestore(a3000_host->host_lock, flags);
41		return IRQ_HANDLED;
42	}
43	printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
44	return IRQ_NONE;
45}
46
47static int dma_setup (Scsi_Cmnd *cmd, int dir_in)
48{
49    unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
50    unsigned long addr = virt_to_bus(cmd->SCp.ptr);
51
52    /*
53     * if the physical address has the wrong alignment, or if
54     * physical address is bad, or if it is a write and at the
55     * end of a physical memory chunk, then allocate a bounce
56     * buffer
57     */
58    if (addr & A3000_XFER_MASK ||
59	(!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
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	    if (cmd->use_sg) {
75		memcpy (HDATA(a3000_host)->dma_bounce_buffer,
76			cmd->SCp.ptr, cmd->SCp.this_residual);
77	    } else
78		memcpy (HDATA(a3000_host)->dma_bounce_buffer,
79			cmd->request_buffer, cmd->request_bufflen);
80	}
81
82	addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
83    }
84
85    /* setup dma direction */
86    if (!dir_in)
87	cntr |= CNTR_DDIR;
88
89    /* remember direction */
90    HDATA(a3000_host)->dma_dir = dir_in;
91
92    DMA(a3000_host)->CNTR = cntr;
93
94    /* setup DMA *physical* address */
95    DMA(a3000_host)->ACR = addr;
96
97    if (dir_in)
98  	/* invalidate any cache */
99	cache_clear (addr, cmd->SCp.this_residual);
100    else
101	/* push any dirty cache */
102	cache_push (addr, cmd->SCp.this_residual);
103
104    /* start DMA */
105    mb();			/* make sure setup is completed */
106    DMA(a3000_host)->ST_DMA = 1;
107    mb();			/* make sure DMA has started before next IO */
108
109    /* return success */
110    return 0;
111}
112
113static void dma_stop (struct Scsi_Host *instance, Scsi_Cmnd *SCpnt,
114		      int status)
115{
116    /* disable SCSI interrupts */
117    unsigned short cntr = CNTR_PDMD;
118
119    if (!HDATA(instance)->dma_dir)
120	cntr |= CNTR_DDIR;
121
122    DMA(instance)->CNTR = cntr;
123    mb();			/* make sure CNTR is updated before next IO */
124
125    /* flush if we were reading */
126    if (HDATA(instance)->dma_dir) {
127	DMA(instance)->FLUSH = 1;
128	mb();			/* don't allow prefetch */
129	while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
130	    barrier();
131	mb();			/* no IO until FLUSH is done */
132    }
133
134    /* clear a possible interrupt */
135    /* I think that this CINT is only necessary if you are
136     * using the terminal count features.   HM 7 Mar 1994
137     */
138    DMA(instance)->CINT = 1;
139
140    /* stop DMA */
141    DMA(instance)->SP_DMA = 1;
142    mb();			/* make sure DMA is stopped before next IO */
143
144    /* restore the CONTROL bits (minus the direction flag) */
145    DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
146    mb();			/* make sure CNTR is updated before next IO */
147
148    /* copy from a bounce buffer, if necessary */
149    if (status && HDATA(instance)->dma_bounce_buffer) {
150	if (SCpnt && SCpnt->use_sg) {
151	    if (HDATA(instance)->dma_dir && SCpnt)
152		memcpy (SCpnt->SCp.ptr,
153			HDATA(instance)->dma_bounce_buffer,
154			SCpnt->SCp.this_residual);
155	    kfree (HDATA(instance)->dma_bounce_buffer);
156	    HDATA(instance)->dma_bounce_buffer = NULL;
157	    HDATA(instance)->dma_bounce_len = 0;
158	} else {
159	    if (HDATA(instance)->dma_dir && SCpnt)
160		memcpy (SCpnt->request_buffer,
161			HDATA(instance)->dma_bounce_buffer,
162			SCpnt->request_bufflen);
163
164	    kfree (HDATA(instance)->dma_bounce_buffer);
165	    HDATA(instance)->dma_bounce_buffer = NULL;
166	    HDATA(instance)->dma_bounce_len = 0;
167	}
168    }
169}
170
171int __init a3000_detect(Scsi_Host_Template *tpnt)
172{
173    wd33c93_regs regs;
174
175    if  (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
176	return 0;
177    if (!request_mem_region(0xDD0000, 256, "wd33c93"))
178	return 0;
179
180    tpnt->proc_name = "A3000";
181    tpnt->proc_info = &wd33c93_proc_info;
182
183    a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
184    if (a3000_host == NULL)
185	goto fail_register;
186
187    a3000_host->base = ZTWO_VADDR(0xDD0000);
188    a3000_host->irq = IRQ_AMIGA_PORTS;
189    DMA(a3000_host)->DAWR = DAWR_A3000;
190    regs.SASR = &(DMA(a3000_host)->SASR);
191    regs.SCMD = &(DMA(a3000_host)->SCMD);
192    wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
193    if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, SA_SHIRQ, "A3000 SCSI",
194		    a3000_intr))
195        goto fail_irq;
196    DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;
197
198    return 1;
199
200fail_irq:
201    wd33c93_release();
202    scsi_unregister(a3000_host);
203fail_register:
204    release_mem_region(0xDD0000, 256);
205    return 0;
206}
207
208static int a3000_bus_reset(Scsi_Cmnd *cmd)
209{
210	/* FIXME perform bus-specific reset */
211
212	/* FIXME 2: kill this entire function, which should
213	   cause mid-layer to call wd33c93_host_reset anyway? */
214
215	spin_lock_irq(cmd->device->host->host_lock);
216	wd33c93_host_reset(cmd);
217	spin_unlock_irq(cmd->device->host->host_lock);
218
219	return SUCCESS;
220}
221
222#define HOSTS_C
223
224static Scsi_Host_Template driver_template = {
225	.proc_name		= "A3000",
226	.name			= "Amiga 3000 built-in SCSI",
227	.detect			= a3000_detect,
228	.release		= a3000_release,
229	.queuecommand		= wd33c93_queuecommand,
230	.eh_abort_handler	= wd33c93_abort,
231	.eh_bus_reset_handler	= a3000_bus_reset,
232	.eh_host_reset_handler	= wd33c93_host_reset,
233	.can_queue		= CAN_QUEUE,
234	.this_id		= 7,
235	.sg_tablesize		= SG_ALL,
236	.cmd_per_lun		= CMD_PER_LUN,
237	.use_clustering		= ENABLE_CLUSTERING
238};
239
240
241#include "scsi_module.c"
242
243int a3000_release(struct Scsi_Host *instance)
244{
245    wd33c93_release();
246    DMA(instance)->CNTR = 0;
247    release_mem_region(0xDD0000, 256);
248    free_irq(IRQ_AMIGA_PORTS, a3000_intr);
249    return 1;
250}
251
252MODULE_LICENSE("GPL");
253