a3000.c revision 9387edbe6045f0bde88f0f0ace51e0ead8a318fe 
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
26static struct Scsi_Host *a3000_host = NULL;
27
28static int a3000_release(struct Scsi_Host *instance);
29
30static 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
48static 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
109static 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
162static 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
194fail_irq:
195    wd33c93_release();
196    scsi_unregister(a3000_host);
197fail_register:
198    release_mem_region(0xDD0000, 256);
199    return 0;
200}
201
202static 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
218static 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
237static 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
246MODULE_LICENSE("GPL");
247