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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#include <linux/init.h>
7#include <linux/kernel.h>
8#include <linux/module.h>
9
10#include <asm/page.h>
11#include <asm/pgtable.h>
12#include <asm/mvme147hw.h>
13#include <asm/irq.h>
14
15#include "scsi.h"
16#include <scsi/scsi_host.h>
17#include "wd33c93.h"
18#include "mvme147.h"
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
68static struct scsi_host_template mvme147_host_template = {
69 .module = THIS_MODULE,
70 .proc_name = "MVME147",
71 .name = "MVME147 built-in SCSI",
72 .queuecommand = wd33c93_queuecommand,
73 .eh_abort_handler = wd33c93_abort,
74 .eh_host_reset_handler = wd33c93_host_reset,
75 .show_info = wd33c93_show_info,
76 .write_info = wd33c93_write_info,
77 .can_queue = CAN_QUEUE,
78 .this_id = 7,
79 .sg_tablesize = SG_ALL,
80 .cmd_per_lun = CMD_PER_LUN,
81};
82
83static struct Scsi_Host *mvme147_shost;
84
85static int __init mvme147_init(void)
86{
87 wd33c93_regs regs;
88 struct WD33C93_hostdata *hdata;
89 int error = -ENOMEM;
90
91 if (!MACH_IS_MVME147)
92 return 0;
93
94 mvme147_shost = scsi_host_alloc(&mvme147_host_template,
95 sizeof(struct WD33C93_hostdata));
96 if (!mvme147_shost)
97 goto err_out;
98 mvme147_shost->base = 0xfffe4000;
99 mvme147_shost->irq = MVME147_IRQ_SCSI_PORT;
100
101 regs.SASR = (volatile unsigned char *)0xfffe4000;
102 regs.SCMD = (volatile unsigned char *)0xfffe4001;
103
104 hdata = shost_priv(mvme147_shost);
105 hdata->no_sync = 0xff;
106 hdata->fast = 0;
107 hdata->dma_mode = CTRL_DMA;
108
109 wd33c93_init(mvme147_shost, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
110
111 error = request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0,
112 "MVME147 SCSI PORT", mvme147_shost);
113 if (error)
114 goto err_unregister;
115 error = request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0,
116 "MVME147 SCSI DMA", mvme147_shost);
117 if (error)
118 goto err_free_irq;
119#if 0 /* Disabled; causes problems booting */
120 m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */
121 udelay(100);
122 m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */
123 udelay(2000);
124 m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */
125#endif
126 m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */
127
128 m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */
129 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */
130
131 error = scsi_add_host(mvme147_shost, NULL);
132 if (error)
133 goto err_free_irq;
134 scsi_scan_host(mvme147_shost);
135 return 0;
136
137err_free_irq:
138 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost);
139err_unregister:
140 scsi_host_put(mvme147_shost);
141err_out:
142 return error;
143}
144
145static void __exit mvme147_exit(void)
146{
147 scsi_remove_host(mvme147_shost);
148
149 /* XXX Make sure DMA is stopped! */
150 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost);
151 free_irq(MVME147_IRQ_SCSI_DMA, mvme147_shost);
152
153 scsi_host_put(mvme147_shost);
154}
155
156module_init(mvme147_init);
157module_exit(mvme147_exit);
158

Warning: That file was not part of the compilation database. It may have many parsing errors.