ARC: ioremap: use more commonly used PAGE_KERNEL based uncached flag
[linux-2.6-microblaze.git] / drivers / scsi / mvme147.c
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/mvme147hw.h>
12 #include <asm/irq.h>
13
14 #include "scsi.h"
15 #include <scsi/scsi_host.h>
16 #include "wd33c93.h"
17 #include "mvme147.h"
18
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
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
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
67 static struct scsi_host_template mvme147_host_template = {
68         .module                 = THIS_MODULE,
69         .proc_name              = "MVME147",
70         .name                   = "MVME147 built-in SCSI",
71         .queuecommand           = wd33c93_queuecommand,
72         .eh_abort_handler       = wd33c93_abort,
73         .eh_host_reset_handler  = wd33c93_host_reset,
74         .show_info              = wd33c93_show_info,
75         .write_info             = wd33c93_write_info,
76         .can_queue              = CAN_QUEUE,
77         .this_id                = 7,
78         .sg_tablesize           = SG_ALL,
79         .cmd_per_lun            = CMD_PER_LUN,
80 };
81
82 static struct Scsi_Host *mvme147_shost;
83
84 static int __init mvme147_init(void)
85 {
86         wd33c93_regs regs;
87         struct WD33C93_hostdata *hdata;
88         int error = -ENOMEM;
89
90         if (!MACH_IS_MVME147)
91                 return 0;
92
93         mvme147_shost = scsi_host_alloc(&mvme147_host_template,
94                         sizeof(struct WD33C93_hostdata));
95         if (!mvme147_shost)
96                 goto err_out;
97         mvme147_shost->base = 0xfffe4000;
98         mvme147_shost->irq = MVME147_IRQ_SCSI_PORT;
99
100         regs.SASR = (volatile unsigned char *)0xfffe4000;
101         regs.SCMD = (volatile unsigned char *)0xfffe4001;
102
103         hdata = shost_priv(mvme147_shost);
104         hdata->no_sync = 0xff;
105         hdata->fast = 0;
106         hdata->dma_mode = CTRL_DMA;
107
108         wd33c93_init(mvme147_shost, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
109
110         error = request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0,
111                         "MVME147 SCSI PORT", mvme147_shost);
112         if (error)
113                 goto err_unregister;
114         error = request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0,
115                         "MVME147 SCSI DMA", mvme147_shost);
116         if (error)
117                 goto err_free_irq;
118 #if 0   /* Disabled; causes problems booting */
119         m147_pcc->scsi_interrupt = 0x10;        /* Assert SCSI bus reset */
120         udelay(100);
121         m147_pcc->scsi_interrupt = 0x00;        /* Negate SCSI bus reset */
122         udelay(2000);
123         m147_pcc->scsi_interrupt = 0x40;        /* Clear bus reset interrupt */
124 #endif
125         m147_pcc->scsi_interrupt = 0x09;        /* Enable interrupt */
126
127         m147_pcc->dma_cntrl = 0x00;     /* ensure DMA is stopped */
128         m147_pcc->dma_intr = 0x89;      /* Ack and enable ints */
129
130         error = scsi_add_host(mvme147_shost, NULL);
131         if (error)
132                 goto err_free_irq;
133         scsi_scan_host(mvme147_shost);
134         return 0;
135
136 err_free_irq:
137         free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost);
138 err_unregister:
139         scsi_host_put(mvme147_shost);
140 err_out:
141         return error;
142 }
143
144 static void __exit mvme147_exit(void)
145 {
146         scsi_remove_host(mvme147_shost);
147
148         /* XXX Make sure DMA is stopped! */
149         free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost);
150         free_irq(MVME147_IRQ_SCSI_DMA, mvme147_shost);
151
152         scsi_host_put(mvme147_shost);
153 }
154
155 module_init(mvme147_init);
156 module_exit(mvme147_exit);