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
mvme147_intr(int irq,void * data)19 static irqreturn_t mvme147_intr(int irq, void *data)
20 {
21 struct Scsi_Host *instance = data;
22
23 if (irq == MVME147_IRQ_SCSI_PORT)
24 wd33c93_intr(instance);
25 else
26 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */
27 return IRQ_HANDLED;
28 }
29
dma_setup(struct scsi_cmnd * cmd,int dir_in)30 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
31 {
32 struct Scsi_Host *instance = cmd->device->host;
33 struct WD33C93_hostdata *hdata = shost_priv(instance);
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->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
52 /* start DMA */
53 m147_pcc->dma_bcr = cmd->SCp.this_residual | (1 << 24);
54 m147_pcc->dma_dadr = addr;
55 m147_pcc->dma_cntrl = flags;
56
57 /* return success */
58 return 0;
59 }
60
dma_stop(struct Scsi_Host * instance,struct scsi_cmnd * SCpnt,int status)61 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
62 int status)
63 {
64 m147_pcc->dma_cntrl = 0;
65 }
66
mvme147_detect(struct scsi_host_template * tpnt)67 int mvme147_detect(struct scsi_host_template *tpnt)
68 {
69 static unsigned char called = 0;
70 struct Scsi_Host *instance;
71 wd33c93_regs regs;
72 struct WD33C93_hostdata *hdata;
73
74 if (!MACH_IS_MVME147 || called)
75 return 0;
76 called++;
77
78 tpnt->proc_name = "MVME147";
79 tpnt->show_info = wd33c93_show_info,
80 tpnt->write_info = wd33c93_write_info,
81
82 instance = scsi_register(tpnt, sizeof(struct WD33C93_hostdata));
83 if (!instance)
84 goto err_out;
85
86 instance->base = 0xfffe4000;
87 instance->irq = MVME147_IRQ_SCSI_PORT;
88 regs.SASR = (volatile unsigned char *)0xfffe4000;
89 regs.SCMD = (volatile unsigned char *)0xfffe4001;
90 hdata = shost_priv(instance);
91 hdata->no_sync = 0xff;
92 hdata->fast = 0;
93 hdata->dma_mode = CTRL_DMA;
94 wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
95
96 if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0,
97 "MVME147 SCSI PORT", instance))
98 goto err_unregister;
99 if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0,
100 "MVME147 SCSI DMA", instance))
101 goto err_free_irq;
102 #if 0 /* Disabled; causes problems booting */
103 m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */
104 udelay(100);
105 m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */
106 udelay(2000);
107 m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */
108 #endif
109 m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */
110
111 m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */
112 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */
113
114 return 1;
115
116 err_free_irq:
117 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
118 err_unregister:
119 scsi_unregister(instance);
120 err_out:
121 return 0;
122 }
123
mvme147_bus_reset(struct scsi_cmnd * cmd)124 static int mvme147_bus_reset(struct scsi_cmnd *cmd)
125 {
126 /* FIXME perform bus-specific reset */
127
128 /* FIXME 2: kill this function, and let midlayer fallback to
129 the same result, calling wd33c93_host_reset() */
130
131 spin_lock_irq(cmd->device->host->host_lock);
132 wd33c93_host_reset(cmd);
133 spin_unlock_irq(cmd->device->host->host_lock);
134
135 return SUCCESS;
136 }
137
138
139 static struct scsi_host_template driver_template = {
140 .proc_name = "MVME147",
141 .name = "MVME147 built-in SCSI",
142 .detect = mvme147_detect,
143 .release = mvme147_release,
144 .queuecommand = wd33c93_queuecommand,
145 .eh_abort_handler = wd33c93_abort,
146 .eh_bus_reset_handler = mvme147_bus_reset,
147 .eh_host_reset_handler = wd33c93_host_reset,
148 .can_queue = CAN_QUEUE,
149 .this_id = 7,
150 .sg_tablesize = SG_ALL,
151 .cmd_per_lun = CMD_PER_LUN,
152 .use_clustering = ENABLE_CLUSTERING
153 };
154
155
156 #include "scsi_module.c"
157
mvme147_release(struct Scsi_Host * instance)158 int mvme147_release(struct Scsi_Host *instance)
159 {
160 #ifdef MODULE
161 /* XXX Make sure DMA is stopped! */
162 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
163 free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr);
164 #endif
165 return 1;
166 }
167