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/scsi.h>
15 #include <scsi/scsi_cmnd.h>
16 #include <scsi/scsi_device.h>
17 #include <scsi/scsi_eh.h>
18 #include <scsi/scsi_host.h>
19 #include <scsi/scsi_tcq.h>
20 #include "wd33c93.h"
21 #include "mvme147.h"
22
mvme147_intr(int irq,void * data)23 static irqreturn_t mvme147_intr(int irq, void *data)
24 {
25 struct Scsi_Host *instance = data;
26
27 if (irq == MVME147_IRQ_SCSI_PORT)
28 wd33c93_intr(instance);
29 else
30 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */
31 return IRQ_HANDLED;
32 }
33
dma_setup(struct scsi_cmnd * cmd,int dir_in)34 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
35 {
36 struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd);
37 struct Scsi_Host *instance = cmd->device->host;
38 struct WD33C93_hostdata *hdata = shost_priv(instance);
39 unsigned char flags = 0x01;
40 unsigned long addr = virt_to_bus(scsi_pointer->ptr);
41
42 /* setup dma direction */
43 if (!dir_in)
44 flags |= 0x04;
45
46 /* remember direction */
47 hdata->dma_dir = dir_in;
48
49 if (dir_in) {
50 /* invalidate any cache */
51 cache_clear(addr, scsi_pointer->this_residual);
52 } else {
53 /* push any dirty cache */
54 cache_push(addr, scsi_pointer->this_residual);
55 }
56
57 /* start DMA */
58 m147_pcc->dma_bcr = scsi_pointer->this_residual | (1 << 24);
59 m147_pcc->dma_dadr = addr;
60 m147_pcc->dma_cntrl = flags;
61
62 /* return success */
63 return 0;
64 }
65
dma_stop(struct Scsi_Host * instance,struct scsi_cmnd * SCpnt,int status)66 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
67 int status)
68 {
69 m147_pcc->dma_cntrl = 0;
70 }
71
72 static struct scsi_host_template mvme147_host_template = {
73 .module = THIS_MODULE,
74 .proc_name = "MVME147",
75 .name = "MVME147 built-in SCSI",
76 .queuecommand = wd33c93_queuecommand,
77 .eh_abort_handler = wd33c93_abort,
78 .eh_host_reset_handler = wd33c93_host_reset,
79 .show_info = wd33c93_show_info,
80 .write_info = wd33c93_write_info,
81 .can_queue = CAN_QUEUE,
82 .this_id = 7,
83 .sg_tablesize = SG_ALL,
84 .cmd_per_lun = CMD_PER_LUN,
85 .cmd_size = sizeof(struct scsi_pointer),
86 };
87
88 static struct Scsi_Host *mvme147_shost;
89
mvme147_init(void)90 static int __init mvme147_init(void)
91 {
92 wd33c93_regs regs;
93 struct WD33C93_hostdata *hdata;
94 int error = -ENOMEM;
95
96 if (!MACH_IS_MVME147)
97 return 0;
98
99 mvme147_shost = scsi_host_alloc(&mvme147_host_template,
100 sizeof(struct WD33C93_hostdata));
101 if (!mvme147_shost)
102 goto err_out;
103 mvme147_shost->base = 0xfffe4000;
104 mvme147_shost->irq = MVME147_IRQ_SCSI_PORT;
105
106 regs.SASR = (volatile unsigned char *)0xfffe4000;
107 regs.SCMD = (volatile unsigned char *)0xfffe4001;
108
109 hdata = shost_priv(mvme147_shost);
110 hdata->no_sync = 0xff;
111 hdata->fast = 0;
112 hdata->dma_mode = CTRL_DMA;
113
114 wd33c93_init(mvme147_shost, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
115
116 error = request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0,
117 "MVME147 SCSI PORT", mvme147_shost);
118 if (error)
119 goto err_unregister;
120 error = request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0,
121 "MVME147 SCSI DMA", mvme147_shost);
122 if (error)
123 goto err_free_irq;
124 #if 0 /* Disabled; causes problems booting */
125 m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */
126 udelay(100);
127 m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */
128 udelay(2000);
129 m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */
130 #endif
131 m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */
132
133 m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */
134 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */
135
136 error = scsi_add_host(mvme147_shost, NULL);
137 if (error)
138 goto err_free_irq;
139 scsi_scan_host(mvme147_shost);
140 return 0;
141
142 err_free_irq:
143 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost);
144 err_unregister:
145 scsi_host_put(mvme147_shost);
146 err_out:
147 return error;
148 }
149
mvme147_exit(void)150 static void __exit mvme147_exit(void)
151 {
152 scsi_remove_host(mvme147_shost);
153
154 /* XXX Make sure DMA is stopped! */
155 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost);
156 free_irq(MVME147_IRQ_SCSI_DMA, mvme147_shost);
157
158 scsi_host_put(mvme147_shost);
159 }
160
161 module_init(mvme147_init);
162 module_exit(mvme147_exit);
163