blob: 1ddd7a11a9588a22330abe898e0045af4a0862d6 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#include <linux/types.h>
2#include <linux/mm.h>
3#include <linux/blkdev.h>
4#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005#include <linux/interrupt.h>
6
7#include <asm/page.h>
8#include <asm/pgtable.h>
9#include <asm/mvme147hw.h>
10#include <asm/irq.h>
11
12#include "scsi.h"
13#include <scsi/scsi_host.h>
14#include "wd33c93.h"
15#include "mvme147.h"
16
17#include<linux/stat.h>
18
19#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
20
21static struct Scsi_Host *mvme147_host = NULL;
22
David Howells7d12e782006-10-05 14:55:46 +010023static irqreturn_t mvme147_intr (int irq, void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -070024{
25 if (irq == MVME147_IRQ_SCSI_PORT)
26 wd33c93_intr (mvme147_host);
27 else
28 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */
29 return IRQ_HANDLED;
30}
31
Henrik Kretzschmar65396412006-09-12 23:49:33 +020032static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
Linus Torvalds1da177e2005-04-16 15:20:36 -070033{
34 unsigned char flags = 0x01;
35 unsigned long addr = virt_to_bus(cmd->SCp.ptr);
36
37 /* setup dma direction */
38 if (!dir_in)
39 flags |= 0x04;
40
41 /* remember direction */
42 HDATA(mvme147_host)->dma_dir = dir_in;
43
44 if (dir_in)
45 /* invalidate any cache */
46 cache_clear (addr, cmd->SCp.this_residual);
47 else
48 /* push any dirty cache */
49 cache_push (addr, cmd->SCp.this_residual);
50
51 /* start DMA */
52 m147_pcc->dma_bcr = cmd->SCp.this_residual | (1<<24);
53 m147_pcc->dma_dadr = addr;
54 m147_pcc->dma_cntrl = flags;
55
56 /* return success */
57 return 0;
58}
59
Henrik Kretzschmar65396412006-09-12 23:49:33 +020060static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 int status)
62{
63 m147_pcc->dma_cntrl = 0;
64}
65
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +010066int mvme147_detect(struct scsi_host_template *tpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -070067{
68 static unsigned char called = 0;
69 wd33c93_regs regs;
70
71 if (!MACH_IS_MVME147 || called)
72 return 0;
73 called++;
74
75 tpnt->proc_name = "MVME147";
76 tpnt->proc_info = &wd33c93_proc_info;
77
78 mvme147_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
79 if (!mvme147_host)
80 goto err_out;
81
82 mvme147_host->base = 0xfffe4000;
83 mvme147_host->irq = MVME147_IRQ_SCSI_PORT;
84 regs.SASR = (volatile unsigned char *)0xfffe4000;
85 regs.SCMD = (volatile unsigned char *)0xfffe4001;
86 wd33c93_init(mvme147_host, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
87
88 if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, "MVME147 SCSI PORT", mvme147_intr))
89 goto err_unregister;
90 if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, "MVME147 SCSI DMA", mvme147_intr))
91 goto err_free_irq;
92#if 0 /* Disabled; causes problems booting */
93 m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */
94 udelay(100);
95 m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */
96 udelay(2000);
97 m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */
98#endif
99 m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */
100
101 m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */
102 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */
103
104 return 1;
105
106 err_free_irq:
107 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
108 err_unregister:
109 wd33c93_release();
110 scsi_unregister(mvme147_host);
111 err_out:
112 return 0;
113}
114
Henrik Kretzschmar65396412006-09-12 23:49:33 +0200115static int mvme147_bus_reset(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116{
117 /* FIXME perform bus-specific reset */
Jeff Garzik 68b3aa72005-05-28 07:56:31 -0400118
Jeff Garzik df0ae242005-05-28 07:57:14 -0400119 /* FIXME 2: kill this function, and let midlayer fallback to
120 the same result, calling wd33c93_host_reset() */
121
Jeff Garzik 68b3aa72005-05-28 07:56:31 -0400122 spin_lock_irq(cmd->device->host->host_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 wd33c93_host_reset(cmd);
Jeff Garzik 68b3aa72005-05-28 07:56:31 -0400124 spin_unlock_irq(cmd->device->host->host_lock);
125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 return SUCCESS;
127}
128
129#define HOSTS_C
130
131#include "mvme147.h"
132
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +0100133static struct scsi_host_template driver_template = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 .proc_name = "MVME147",
135 .name = "MVME147 built-in SCSI",
136 .detect = mvme147_detect,
137 .release = mvme147_release,
138 .queuecommand = wd33c93_queuecommand,
139 .eh_abort_handler = wd33c93_abort,
140 .eh_bus_reset_handler = mvme147_bus_reset,
141 .eh_host_reset_handler = wd33c93_host_reset,
142 .can_queue = CAN_QUEUE,
143 .this_id = 7,
144 .sg_tablesize = SG_ALL,
145 .cmd_per_lun = CMD_PER_LUN,
146 .use_clustering = ENABLE_CLUSTERING
147};
148
149
150#include "scsi_module.c"
151
152int mvme147_release(struct Scsi_Host *instance)
153{
154#ifdef MODULE
155 /* XXX Make sure DMA is stopped! */
156 wd33c93_release();
157 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
158 free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr);
159#endif
160 return 1;
161}