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192.168.1.100 / T103 / c120696e414a5fc38d6b29d727b6f88abffa5282 / . / src / kernel / linux / v4.14 / drivers / scsi / mvme147.c
blob: e6b2b681fda3164b27f0116bfc119ac9d1f3481b [file] [log] [blame]
rjw1f884582022-01-06 17:20:42 +0800[diff] [blame]1// SPDX-License-Identifier: GPL-2.0
2#include <linux/types.h>
3#include <linux/mm.h>
4#include <linux/blkdev.h>
5#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
20static irqreturn_t mvme147_intr(int irq, void *data)
21{
22 struct Scsi_Host *instance = data;
23
24 if (irq == MVME147_IRQ_SCSI_PORT)
25 wd33c93_intr(instance);
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 struct Scsi_Host *instance = cmd->device->host;
34 struct WD33C93_hostdata *hdata = shost_priv(instance);
35 unsigned char flags = 0x01;
36 unsigned long addr = virt_to_bus(cmd->SCp.ptr);
37
38 /* setup dma direction */
39 if (!dir_in)
40 flags |= 0x04;
41
42 /* remember direction */
43 hdata->dma_dir = dir_in;
44
45 if (dir_in) {
46 /* invalidate any cache */
47 cache_clear(addr, cmd->SCp.this_residual);
48 } else {
49 /* push any dirty cache */
50 cache_push(addr, cmd->SCp.this_residual);
51 }
52
53 /* start DMA */
54 m147_pcc->dma_bcr = cmd->SCp.this_residual | (1 << 24);
55 m147_pcc->dma_dadr = addr;
56 m147_pcc->dma_cntrl = flags;
57
58 /* return success */
59 return 0;
60}
61
62static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
63 int status)
64{
65 m147_pcc->dma_cntrl = 0;
66}
67
68int mvme147_detect(struct scsi_host_template *tpnt)
69{
70 static unsigned char called = 0;
71 struct Scsi_Host *instance;
72 wd33c93_regs regs;
73 struct WD33C93_hostdata *hdata;
74
75 if (!MACH_IS_MVME147 || called)
76 return 0;
77 called++;
78
79 tpnt->proc_name = "MVME147";
80 tpnt->show_info = wd33c93_show_info,
81 tpnt->write_info = wd33c93_write_info,
82
83 instance = scsi_register(tpnt, sizeof(struct WD33C93_hostdata));
84 if (!instance)
85 goto err_out;
86
87 instance->base = 0xfffe4000;
88 instance->irq = MVME147_IRQ_SCSI_PORT;
89 regs.SASR = (volatile unsigned char *)0xfffe4000;
90 regs.SCMD = (volatile unsigned char *)0xfffe4001;
91 hdata = shost_priv(instance);
92 hdata->no_sync = 0xff;
93 hdata->fast = 0;
94 hdata->dma_mode = CTRL_DMA;
95 wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
96
97 if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0,
98 "MVME147 SCSI PORT", instance))
99 goto err_unregister;
100 if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0,
101 "MVME147 SCSI DMA", instance))
102 goto err_free_irq;
103#if 0 /* Disabled; causes problems booting */
104 m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */
105 udelay(100);
106 m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */
107 udelay(2000);
108 m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */
109#endif
110 m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */
111
112 m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */
113 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */
114
115 return 1;
116
117err_free_irq:
118 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
119err_unregister:
120 scsi_unregister(instance);
121err_out:
122 return 0;
123}
124
125static struct scsi_host_template driver_template = {
126 .proc_name = "MVME147",
127 .name = "MVME147 built-in SCSI",
128 .detect = mvme147_detect,
129 .release = mvme147_release,
130 .queuecommand = wd33c93_queuecommand,
131 .eh_abort_handler = wd33c93_abort,
132 .eh_host_reset_handler = wd33c93_host_reset,
133 .can_queue = CAN_QUEUE,
134 .this_id = 7,
135 .sg_tablesize = SG_ALL,
136 .cmd_per_lun = CMD_PER_LUN,
137 .use_clustering = ENABLE_CLUSTERING
138};
139
140
141#include "scsi_module.c"
142
143int mvme147_release(struct Scsi_Host *instance)
144{
145#ifdef MODULE
146 /* XXX Make sure DMA is stopped! */
147 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
148 free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr);
149#endif
150 return 1;
151}