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1da177e4 LT |
1 | #include <linux/types.h> |
2 | #include <linux/mm.h> | |
3 | #include <linux/blkdev.h> | |
1da177e4 LT |
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 | ||
be4540db | 16 | #include <linux/stat.h> |
1da177e4 | 17 | |
be4540db | 18 | |
1da177e4 LT |
19 | static struct Scsi_Host *mvme147_host = NULL; |
20 | ||
be4540db | 21 | static irqreturn_t mvme147_intr(int irq, void *dummy) |
1da177e4 | 22 | { |
be4540db GU |
23 | if (irq == MVME147_IRQ_SCSI_PORT) |
24 | wd33c93_intr(mvme147_host); | |
25 | else | |
26 | m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ | |
27 | return IRQ_HANDLED; | |
1da177e4 LT |
28 | } |
29 | ||
65396410 | 30 | static int dma_setup(struct scsi_cmnd *cmd, int dir_in) |
1da177e4 | 31 | { |
ce195662 | 32 | struct WD33C93_hostdata *hdata = shost_priv(mvme147_host); |
be4540db GU |
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 */ | |
ce195662 | 41 | hdata->dma_dir = dir_in; |
be4540db GU |
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 | ||
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; | |
1da177e4 LT |
58 | } |
59 | ||
65396410 | 60 | static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, |
be4540db | 61 | int status) |
1da177e4 | 62 | { |
be4540db | 63 | m147_pcc->dma_cntrl = 0; |
1da177e4 LT |
64 | } |
65 | ||
d0be4a7d | 66 | int mvme147_detect(struct scsi_host_template *tpnt) |
1da177e4 | 67 | { |
be4540db GU |
68 | static unsigned char called = 0; |
69 | wd33c93_regs regs; | |
ce195662 | 70 | struct WD33C93_hostdata *hdata; |
be4540db GU |
71 | |
72 | if (!MACH_IS_MVME147 || called) | |
73 | return 0; | |
74 | called++; | |
75 | ||
76 | tpnt->proc_name = "MVME147"; | |
77 | tpnt->proc_info = &wd33c93_proc_info; | |
78 | ||
79 | mvme147_host = scsi_register(tpnt, sizeof(struct WD33C93_hostdata)); | |
80 | if (!mvme147_host) | |
81 | goto err_out; | |
82 | ||
83 | mvme147_host->base = 0xfffe4000; | |
84 | mvme147_host->irq = MVME147_IRQ_SCSI_PORT; | |
85 | regs.SASR = (volatile unsigned char *)0xfffe4000; | |
86 | regs.SCMD = (volatile unsigned char *)0xfffe4001; | |
ce195662 GU |
87 | hdata = shost_priv(mvme147_host); |
88 | hdata->no_sync = 0xff; | |
89 | hdata->fast = 0; | |
90 | hdata->dma_mode = CTRL_DMA; | |
be4540db GU |
91 | wd33c93_init(mvme147_host, regs, dma_setup, dma_stop, WD33C93_FS_8_10); |
92 | ||
93 | if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, | |
94 | "MVME147 SCSI PORT", mvme147_intr)) | |
95 | goto err_unregister; | |
96 | if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, | |
97 | "MVME147 SCSI DMA", mvme147_intr)) | |
98 | goto err_free_irq; | |
1da177e4 | 99 | #if 0 /* Disabled; causes problems booting */ |
be4540db GU |
100 | m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */ |
101 | udelay(100); | |
102 | m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */ | |
103 | udelay(2000); | |
104 | m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */ | |
1da177e4 | 105 | #endif |
be4540db | 106 | m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */ |
1da177e4 | 107 | |
be4540db GU |
108 | m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */ |
109 | m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ | |
1da177e4 | 110 | |
be4540db | 111 | return 1; |
1da177e4 | 112 | |
be4540db GU |
113 | err_free_irq: |
114 | free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr); | |
115 | err_unregister: | |
116 | scsi_unregister(mvme147_host); | |
117 | err_out: | |
118 | return 0; | |
1da177e4 LT |
119 | } |
120 | ||
65396410 | 121 | static int mvme147_bus_reset(struct scsi_cmnd *cmd) |
1da177e4 LT |
122 | { |
123 | /* FIXME perform bus-specific reset */ | |
68b3aa7c | 124 | |
be4540db | 125 | /* FIXME 2: kill this function, and let midlayer fallback to |
df0ae249 JG |
126 | the same result, calling wd33c93_host_reset() */ |
127 | ||
68b3aa7c | 128 | spin_lock_irq(cmd->device->host->host_lock); |
1da177e4 | 129 | wd33c93_host_reset(cmd); |
68b3aa7c JG |
130 | spin_unlock_irq(cmd->device->host->host_lock); |
131 | ||
1da177e4 LT |
132 | return SUCCESS; |
133 | } | |
134 | ||
135 | #define HOSTS_C | |
136 | ||
137 | #include "mvme147.h" | |
138 | ||
d0be4a7d | 139 | static struct scsi_host_template driver_template = { |
1da177e4 LT |
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 | ||
158 | int mvme147_release(struct Scsi_Host *instance) | |
159 | { | |
160 | #ifdef MODULE | |
be4540db GU |
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); | |
1da177e4 | 164 | #endif |
be4540db | 165 | return 1; |
1da177e4 | 166 | } |