1#include <linux/types.h>
2#include <linux/mm.h>
3#include <linux/blkdev.h>
4#include <linux/interrupt.h>
5
6#include <asm/page.h>
7#include <asm/pgtable.h>
8#include <asm/mvme147hw.h>
9#include <asm/irq.h>
10
11#include "scsi.h"
12#include <scsi/scsi_host.h>
13#include "wd33c93.h"
14#include "mvme147.h"
15
16#include <linux/stat.h>
17
18
19static 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
30static 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
61static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
62		     int status)
63{
64	m147_pcc->dma_cntrl = 0;
65}
66
67int mvme147_detect(struct scsi_host_template *tpnt)
68{
69	static unsigned char called = 0;
70	struct Scsi_Host *instance;
71	wd33c93_regs regs;
72	struct WD33C93_hostdata *hdata;
73
74	if (!MACH_IS_MVME147 || called)
75		return 0;
76	called++;
77
78	tpnt->proc_name = "MVME147";
79	tpnt->show_info = wd33c93_show_info,
80	tpnt->write_info = wd33c93_write_info,
81
82	instance = scsi_register(tpnt, sizeof(struct WD33C93_hostdata));
83	if (!instance)
84		goto err_out;
85
86	instance->base = 0xfffe4000;
87	instance->irq = MVME147_IRQ_SCSI_PORT;
88	regs.SASR = (volatile unsigned char *)0xfffe4000;
89	regs.SCMD = (volatile unsigned char *)0xfffe4001;
90	hdata = shost_priv(instance);
91	hdata->no_sync = 0xff;
92	hdata->fast = 0;
93	hdata->dma_mode = CTRL_DMA;
94	wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
95
96	if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0,
97			"MVME147 SCSI PORT", instance))
98		goto err_unregister;
99	if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0,
100			"MVME147 SCSI DMA", instance))
101		goto err_free_irq;
102#if 0	/* Disabled; causes problems booting */
103	m147_pcc->scsi_interrupt = 0x10;	/* Assert SCSI bus reset */
104	udelay(100);
105	m147_pcc->scsi_interrupt = 0x00;	/* Negate SCSI bus reset */
106	udelay(2000);
107	m147_pcc->scsi_interrupt = 0x40;	/* Clear bus reset interrupt */
108#endif
109	m147_pcc->scsi_interrupt = 0x09;	/* Enable interrupt */
110
111	m147_pcc->dma_cntrl = 0x00;	/* ensure DMA is stopped */
112	m147_pcc->dma_intr = 0x89;	/* Ack and enable ints */
113
114	return 1;
115
116err_free_irq:
117	free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
118err_unregister:
119	scsi_unregister(instance);
120err_out:
121	return 0;
122}
123
124static int mvme147_bus_reset(struct scsi_cmnd *cmd)
125{
126	/* FIXME perform bus-specific reset */
127
128	/* FIXME 2: kill this function, and let midlayer fallback to
129	   the same result, calling wd33c93_host_reset() */
130
131	spin_lock_irq(cmd->device->host->host_lock);
132	wd33c93_host_reset(cmd);
133	spin_unlock_irq(cmd->device->host->host_lock);
134
135	return SUCCESS;
136}
137
138
139static struct scsi_host_template driver_template = {
140	.proc_name		= "MVME147",
141	.name			= "MVME147 built-in SCSI",
142	.detect			= mvme147_detect,
143	.release		= mvme147_release,
144	.queuecommand		= wd33c93_queuecommand,
145	.eh_abort_handler	= wd33c93_abort,
146	.eh_bus_reset_handler	= mvme147_bus_reset,
147	.eh_host_reset_handler	= wd33c93_host_reset,
148	.can_queue		= CAN_QUEUE,
149	.this_id		= 7,
150	.sg_tablesize		= SG_ALL,
151	.cmd_per_lun		= CMD_PER_LUN,
152	.use_clustering		= ENABLE_CLUSTERING
153};
154
155
156#include "scsi_module.c"
157
158int mvme147_release(struct Scsi_Host *instance)
159{
160#ifdef MODULE
161	/* XXX Make sure DMA is stopped! */
162	free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
163	free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr);
164#endif
165	return 1;
166}
167