a3000.c revision cc0455fac06f0539277d7b724dbc513284629069 
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 irqreturn_t a3000_intr (int irq, void *dummy)
29{
30	unsigned long flags;
31	unsigned int status = DMA(a3000_host)->ISTR;
32
33	if (!(status & ISTR_INT_P))
34		return IRQ_NONE;
35	if (status & ISTR_INTS)
36	{
37		spin_lock_irqsave(a3000_host->host_lock, flags);
38		wd33c93_intr (a3000_host);
39		spin_unlock_irqrestore(a3000_host->host_lock, flags);
40		return IRQ_HANDLED;
41	}
42	printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
43	return IRQ_NONE;
44}
45
46static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
47{
48    unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
49    unsigned long addr = virt_to_bus(cmd->SCp.ptr);
50
51    /*
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
55     * buffer
56     */
57    if (addr & A3000_XFER_MASK ||
58	(!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
59    {
60	HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
61	    & ~0x1ff;
62	HDATA(a3000_host)->dma_bounce_buffer =
63	    kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL);
64
65	/* can't allocate memory; use PIO */
66	if (!HDATA(a3000_host)->dma_bounce_buffer) {
67	    HDATA(a3000_host)->dma_bounce_len = 0;
68	    return 1;
69	}
70
71	if (!dir_in) {
72	    /* copy to bounce buffer for a write */
73	    memcpy (HDATA(a3000_host)->dma_bounce_buffer,
74		cmd->SCp.ptr, cmd->SCp.this_residual);
75	}
76
77	addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
78    }
79
80    /* setup dma direction */
81    if (!dir_in)
82	cntr |= CNTR_DDIR;
83
84    /* remember direction */
85    HDATA(a3000_host)->dma_dir = dir_in;
86
87    DMA(a3000_host)->CNTR = cntr;
88
89    /* setup DMA *physical* address */
90    DMA(a3000_host)->ACR = addr;
91
92    if (dir_in)
93  	/* invalidate any cache */
94	cache_clear (addr, cmd->SCp.this_residual);
95    else
96	/* push any dirty cache */
97	cache_push (addr, cmd->SCp.this_residual);
98
99    /* start DMA */
100    mb();			/* make sure setup is completed */
101    DMA(a3000_host)->ST_DMA = 1;
102    mb();			/* make sure DMA has started before next IO */
103
104    /* return success */
105    return 0;
106}
107
108static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
109		     int status)
110{
111    /* disable SCSI interrupts */
112    unsigned short cntr = CNTR_PDMD;
113
114    if (!HDATA(instance)->dma_dir)
115	cntr |= CNTR_DDIR;
116
117    DMA(instance)->CNTR = cntr;
118    mb();			/* make sure CNTR is updated before next IO */
119
120    /* flush if we were reading */
121    if (HDATA(instance)->dma_dir) {
122	DMA(instance)->FLUSH = 1;
123	mb();			/* don't allow prefetch */
124	while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
125	    barrier();
126	mb();			/* no IO until FLUSH is done */
127    }
128
129    /* clear a possible interrupt */
130    /* I think that this CINT is only necessary if you are
131     * using the terminal count features.   HM 7 Mar 1994
132     */
133    DMA(instance)->CINT = 1;
134
135    /* stop DMA */
136    DMA(instance)->SP_DMA = 1;
137    mb();			/* make sure DMA is stopped before next IO */
138
139    /* restore the CONTROL bits (minus the direction flag) */
140    DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
141    mb();			/* make sure CNTR is updated before next IO */
142
143    /* copy from a bounce buffer, if necessary */
144    if (status && HDATA(instance)->dma_bounce_buffer) {
145	if (SCpnt) {
146	    if (HDATA(instance)->dma_dir && SCpnt)
147		memcpy (SCpnt->SCp.ptr,
148			HDATA(instance)->dma_bounce_buffer,
149			SCpnt->SCp.this_residual);
150	    kfree (HDATA(instance)->dma_bounce_buffer);
151	    HDATA(instance)->dma_bounce_buffer = NULL;
152	    HDATA(instance)->dma_bounce_len = 0;
153	} else {
154	    kfree (HDATA(instance)->dma_bounce_buffer);
155	    HDATA(instance)->dma_bounce_buffer = NULL;
156	    HDATA(instance)->dma_bounce_len = 0;
157	}
158    }
159}
160
161int __init a3000_detect(struct scsi_host_template *tpnt)
162{
163    wd33c93_regs regs;
164
165    if  (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
166	return 0;
167    if (!request_mem_region(0xDD0000, 256, "wd33c93"))
168	return 0;
169
170    tpnt->proc_name = "A3000";
171    tpnt->proc_info = &wd33c93_proc_info;
172
173    a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
174    if (a3000_host == NULL)
175	goto fail_register;
176
177    a3000_host->base = ZTWO_VADDR(0xDD0000);
178    a3000_host->irq = IRQ_AMIGA_PORTS;
179    DMA(a3000_host)->DAWR = DAWR_A3000;
180    regs.SASR = &(DMA(a3000_host)->SASR);
181    regs.SCMD = &(DMA(a3000_host)->SCMD);
182    wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
183    if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
184		    a3000_intr))
185        goto fail_irq;
186    DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;
187
188    return 1;
189
190fail_irq:
191    wd33c93_release();
192    scsi_unregister(a3000_host);
193fail_register:
194    release_mem_region(0xDD0000, 256);
195    return 0;
196}
197
198static int a3000_bus_reset(struct scsi_cmnd *cmd)
199{
200	/* FIXME perform bus-specific reset */
201
202	/* FIXME 2: kill this entire function, which should
203	   cause mid-layer to call wd33c93_host_reset anyway? */
204
205	spin_lock_irq(cmd->device->host->host_lock);
206	wd33c93_host_reset(cmd);
207	spin_unlock_irq(cmd->device->host->host_lock);
208
209	return SUCCESS;
210}
211
212#define HOSTS_C
213
214static struct scsi_host_template driver_template = {
215	.proc_name		= "A3000",
216	.name			= "Amiga 3000 built-in SCSI",
217	.detect			= a3000_detect,
218	.release		= a3000_release,
219	.queuecommand		= wd33c93_queuecommand,
220	.eh_abort_handler	= wd33c93_abort,
221	.eh_bus_reset_handler	= a3000_bus_reset,
222	.eh_host_reset_handler	= wd33c93_host_reset,
223	.can_queue		= CAN_QUEUE,
224	.this_id		= 7,
225	.sg_tablesize		= SG_ALL,
226	.cmd_per_lun		= CMD_PER_LUN,
227	.use_clustering		= ENABLE_CLUSTERING
228};
229
230
231#include "scsi_module.c"
232
233int a3000_release(struct Scsi_Host *instance)
234{
235    wd33c93_release();
236    DMA(instance)->CNTR = 0;
237    release_mem_region(0xDD0000, 256);
238    free_irq(IRQ_AMIGA_PORTS, a3000_intr);
239    return 1;
240}
241
242MODULE_LICENSE("GPL");
243