tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <linux/types.h>
2#include <linux/mm.h>
3#include <linux/blkdev.h>
4#include <linux/interrupt.h>
5
6#include <asm/page.h>
7#include <asm/pgtable.h>
8#include <asm/mvme147hw.h>
9#include <asm/irq.h>
10
11#include "scsi.h"
12#include <scsi/scsi_host.h>
13#include "wd33c93.h"
14#include "mvme147.h"
15
16#include<linux/stat.h>
17
18#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
19
20static struct Scsi_Host *mvme147_host = NULL;
21
22static irqreturn_t mvme147_intr (int irq, void *dummy)
23{
24 if (irq == MVME147_IRQ_SCSI_PORT)
25 wd33c93_intr (mvme147_host);
26 else
27 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */
28 return IRQ_HANDLED;
29}
30
31static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
32{
33 unsigned char flags = 0x01;
34 unsigned long addr = virt_to_bus(cmd->SCp.ptr);
35
36 /* setup dma direction */
37 if (!dir_in)
38 flags |= 0x04;
39
40 /* remember direction */
41 HDATA(mvme147_host)->dma_dir = dir_in;
42
43 if (dir_in)
44 /* invalidate any cache */
45 cache_clear (addr, cmd->SCp.this_residual);
46 else
47 /* push any dirty cache */
48 cache_push (addr, cmd->SCp.this_residual);
49
50 /* start DMA */
51 m147_pcc->dma_bcr = cmd->SCp.this_residual | (1<<24);
52 m147_pcc->dma_dadr = addr;
53 m147_pcc->dma_cntrl = flags;
54
55 /* return success */
56 return 0;
57}
58
59static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
60 int status)
61{
62 m147_pcc->dma_cntrl = 0;
63}
64
65int mvme147_detect(struct scsi_host_template *tpnt)
66{
67 static unsigned char called = 0;
68 wd33c93_regs regs;
69
70 if (!MACH_IS_MVME147 || called)
71 return 0;
72 called++;
73
74 tpnt->proc_name = "MVME147";
75 tpnt->proc_info = &wd33c93_proc_info;
76
77 mvme147_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
78 if (!mvme147_host)
79 goto err_out;
80
81 mvme147_host->base = 0xfffe4000;
82 mvme147_host->irq = MVME147_IRQ_SCSI_PORT;
83 regs.SASR = (volatile unsigned char *)0xfffe4000;
84 regs.SCMD = (volatile unsigned char *)0xfffe4001;
85 HDATA(mvme147_host)->no_sync = 0xff;
86 HDATA(mvme147_host)->fast = 0;
87 HDATA(mvme147_host)->dma_mode = CTRL_DMA;
88 wd33c93_init(mvme147_host, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
89
90 if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, "MVME147 SCSI PORT", mvme147_intr))
91 goto err_unregister;
92 if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, "MVME147 SCSI DMA", mvme147_intr))
93 goto err_free_irq;
94#if 0 /* Disabled; causes problems booting */
95 m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */
96 udelay(100);
97 m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */
98 udelay(2000);
99 m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */
100#endif
101 m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */
102
103 m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */
104 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */
105
106 return 1;
107
108 err_free_irq:
109 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
110 err_unregister:
111 wd33c93_release();
112 scsi_unregister(mvme147_host);
113 err_out:
114 return 0;
115}
116
117static int mvme147_bus_reset(struct scsi_cmnd *cmd)
118{
119 /* FIXME perform bus-specific reset */
120
121 /* FIXME 2: kill this function, and let midlayer fallback to
122 the same result, calling wd33c93_host_reset() */
123
124 spin_lock_irq(cmd->device->host->host_lock);
125 wd33c93_host_reset(cmd);
126 spin_unlock_irq(cmd->device->host->host_lock);
127
128 return SUCCESS;
129}
130
131#define HOSTS_C
132
133#include "mvme147.h"
134
135static struct scsi_host_template driver_template = {
136 .proc_name = "MVME147",
137 .name = "MVME147 built-in SCSI",
138 .detect = mvme147_detect,
139 .release = mvme147_release,
140 .queuecommand = wd33c93_queuecommand,
141 .eh_abort_handler = wd33c93_abort,
142 .eh_bus_reset_handler = mvme147_bus_reset,
143 .eh_host_reset_handler = wd33c93_host_reset,
144 .can_queue = CAN_QUEUE,
145 .this_id = 7,
146 .sg_tablesize = SG_ALL,
147 .cmd_per_lun = CMD_PER_LUN,
148 .use_clustering = ENABLE_CLUSTERING
149};
150
151
152#include "scsi_module.c"
153
154int mvme147_release(struct Scsi_Host *instance)
155{
156#ifdef MODULE
157 /* XXX Make sure DMA is stopped! */
158 wd33c93_release();
159 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
160 free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr);
161#endif
162 return 1;
163}