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
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
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
mvme147_init(void)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
mvme147_exit(void)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);
157