summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/maps/scx200_docflash.c
blob: 7f1a0e690c4f93399f551fad40ed80ad83a3b5db (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
/* linux/drivers/mtd/maps/scx200_docflash.c

   Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>

   National Semiconductor SCx200 flash mapped with DOCCS
*/

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>

#include <linux/pci.h>
#include <linux/scx200.h>

#define NAME "scx200_docflash"

MODULE_AUTHOR("Christer Weinigel <wingel@hack.org>");
MODULE_DESCRIPTION("NatSemi SCx200 DOCCS Flash Driver");
MODULE_LICENSE("GPL");

static int probe = 0;		/* Don't autoprobe */
static unsigned size = 0x1000000; /* 16 MiB the whole ISA address space */
static unsigned width = 8;	/* Default to 8 bits wide */
static char *flashtype = "cfi_probe";

module_param(probe, int, 0);
MODULE_PARM_DESC(probe, "Probe for a BIOS mapping");
module_param(size, int, 0);
MODULE_PARM_DESC(size, "Size of the flash mapping");
module_param(width, int, 0);
MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)");
module_param(flashtype, charp, 0);
MODULE_PARM_DESC(flashtype, "Type of MTD probe to do");

static struct resource docmem = {
	.flags = IORESOURCE_MEM,
	.name  = "NatSemi SCx200 DOCCS Flash",
};

static struct mtd_info *mymtd;

static struct mtd_partition partition_info[] = {
	{
		.name   = "DOCCS Boot kernel",
		.offset = 0,
		.size   = 0xc0000
	},
	{
		.name   = "DOCCS Low BIOS",
		.offset = 0xc0000,
		.size   = 0x40000
	},
	{
		.name   = "DOCCS File system",
		.offset = 0x100000,
		.size   = ~0	/* calculate from flash size */
	},
	{
		.name   = "DOCCS High BIOS",
		.offset = ~0, 	/* calculate from flash size */
		.size   = 0x80000
	},
};
#define NUM_PARTITIONS ARRAY_SIZE(partition_info)

static struct map_info scx200_docflash_map = {
	.name      = "NatSemi SCx200 DOCCS Flash",
};

static int __init init_scx200_docflash(void)
{
	unsigned u;
	unsigned base;
	unsigned ctrl;
	unsigned pmr;
	struct pci_dev *bridge;

	printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n");

	if ((bridge = pci_get_device(PCI_VENDOR_ID_NS,
				      PCI_DEVICE_ID_NS_SCx200_BRIDGE,
				      NULL)) == NULL)
		return -ENODEV;

	/* check that we have found the configuration block */
	if (!scx200_cb_present()) {
		pci_dev_put(bridge);
		return -ENODEV;
	}

	if (probe) {
		/* Try to use the present flash mapping if any */
		pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base);
		pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl);
		pci_dev_put(bridge);

		pmr = inl(scx200_cb_base + SCx200_PMR);

		if (base == 0
		    || (ctrl & 0x07000000) != 0x07000000
		    || (ctrl & 0x0007ffff) == 0)
			return -ENODEV;

		size = ((ctrl&0x1fff)<<13) + (1<<13);

		for (u = size; u > 1; u >>= 1)
			;
		if (u != 1)
			return -ENODEV;

		if (pmr & (1<<6))
			width = 16;
		else
			width = 8;

		docmem.start = base;
		docmem.end = base + size;

		if (request_resource(&iomem_resource, &docmem)) {
			printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
			return -ENOMEM;
		}
	} else {
		pci_dev_put(bridge);
		for (u = size; u > 1; u >>= 1)
			;
		if (u != 1) {
			printk(KERN_ERR NAME ": invalid size for flash mapping\n");
			return -EINVAL;
		}

		if (width != 8 && width != 16) {
			printk(KERN_ERR NAME ": invalid bus width for flash mapping\n");
			return -EINVAL;
		}

		if (allocate_resource(&iomem_resource, &docmem,
				      size,
				      0xc0000000, 0xffffffff,
				      size, NULL, NULL)) {
			printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
			return -ENOMEM;
		}

		ctrl = 0x07000000 | ((size-1) >> 13);

		printk(KERN_INFO "DOCCS BASE=0x%08lx, CTRL=0x%08lx\n", (long)docmem.start, (long)ctrl);

		pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start);
		pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl);
		pmr = inl(scx200_cb_base + SCx200_PMR);

		if (width == 8) {
			pmr &= ~(1<<6);
		} else {
			pmr |= (1<<6);
		}
		outl(pmr, scx200_cb_base + SCx200_PMR);
	}

	printk(KERN_INFO NAME ": DOCCS mapped at %pR, width %d\n",
	       &docmem, width);

	scx200_docflash_map.size = size;
	if (width == 8)
		scx200_docflash_map.bankwidth = 1;
	else
		scx200_docflash_map.bankwidth = 2;

	simple_map_init(&scx200_docflash_map);

	scx200_docflash_map.phys = docmem.start;
	scx200_docflash_map.virt = ioremap(docmem.start, scx200_docflash_map.size);
	if (!scx200_docflash_map.virt) {
		printk(KERN_ERR NAME ": failed to ioremap the flash\n");
		release_resource(&docmem);
		return -EIO;
	}

	mymtd = do_map_probe(flashtype, &scx200_docflash_map);
	if (!mymtd) {
		printk(KERN_ERR NAME ": unable to detect flash\n");
		iounmap(scx200_docflash_map.virt);
		release_resource(&docmem);
		return -ENXIO;
	}

	if (size < mymtd->size)
		printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n");

	mymtd->owner = THIS_MODULE;

	partition_info[3].offset = mymtd->size-partition_info[3].size;
	partition_info[2].size = partition_info[3].offset-partition_info[2].offset;
	mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);

	return 0;
}

static void __exit cleanup_scx200_docflash(void)
{
	if (mymtd) {
		mtd_device_unregister(mymtd);
		map_destroy(mymtd);
	}
	if (scx200_docflash_map.virt) {
		iounmap(scx200_docflash_map.virt);
		release_resource(&docmem);
	}
}

module_init(init_scx200_docflash);
module_exit(cleanup_scx200_docflash);