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 | |
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 | |
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(shost: 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 | |
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 const 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 | |
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(shost: mvme147_shost); |
110 | hdata->no_sync = 0xff; |
111 | hdata->fast = 0; |
112 | hdata->dma_mode = CTRL_DMA; |
113 | |
114 | wd33c93_init(instance: mvme147_shost, regs, setup: dma_setup, stop: dma_stop, WD33C93_FS_8_10); |
115 | |
116 | error = request_irq(irq: MVME147_IRQ_SCSI_PORT, handler: mvme147_intr, flags: 0, |
117 | name: "MVME147 SCSI PORT" , dev: mvme147_shost); |
118 | if (error) |
119 | goto err_unregister; |
120 | error = request_irq(irq: MVME147_IRQ_SCSI_DMA, handler: mvme147_intr, flags: 0, |
121 | name: "MVME147 SCSI DMA" , dev: 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(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(t: mvme147_shost); |
146 | err_out: |
147 | return error; |
148 | } |
149 | |
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(t: mvme147_shost); |
159 | } |
160 | |
161 | module_init(mvme147_init); |
162 | module_exit(mvme147_exit); |
163 | |