1/* linux/drivers/mtd/maps/scx200_docflash.c
2
3   Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
4
5   National Semiconductor SCx200 flash mapped with DOCCS
6*/
7
8#include <linux/module.h>
9#include <linux/types.h>
10#include <linux/kernel.h>
11#include <linux/init.h>
12#include <asm/io.h>
13#include <linux/mtd/mtd.h>
14#include <linux/mtd/map.h>
15#include <linux/mtd/partitions.h>
16
17#include <linux/pci.h>
18#include <linux/scx200.h>
19
20#define NAME "scx200_docflash"
21
22MODULE_AUTHOR("Christer Weinigel <wingel@hack.org>");
23MODULE_DESCRIPTION("NatSemi SCx200 DOCCS Flash Driver");
24MODULE_LICENSE("GPL");
25
26static int probe = 0;		/* Don't autoprobe */
27static unsigned size = 0x1000000; /* 16 MiB the whole ISA address space */
28static unsigned width = 8;	/* Default to 8 bits wide */
29static char *flashtype = "cfi_probe";
30
31module_param(probe, int, 0);
32MODULE_PARM_DESC(probe, "Probe for a BIOS mapping");
33module_param(size, int, 0);
34MODULE_PARM_DESC(size, "Size of the flash mapping");
35module_param(width, int, 0);
36MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)");
37module_param(flashtype, charp, 0);
38MODULE_PARM_DESC(flashtype, "Type of MTD probe to do");
39
40static struct resource docmem = {
41	.flags = IORESOURCE_MEM,
42	.name  = "NatSemi SCx200 DOCCS Flash",
43};
44
45static struct mtd_info *mymtd;
46
47static struct mtd_partition partition_info[] = {
48	{
49		.name   = "DOCCS Boot kernel",
50		.offset = 0,
51		.size   = 0xc0000
52	},
53	{
54		.name   = "DOCCS Low BIOS",
55		.offset = 0xc0000,
56		.size   = 0x40000
57	},
58	{
59		.name   = "DOCCS File system",
60		.offset = 0x100000,
61		.size   = ~0	/* calculate from flash size */
62	},
63	{
64		.name   = "DOCCS High BIOS",
65		.offset = ~0, 	/* calculate from flash size */
66		.size   = 0x80000
67	},
68};
69#define NUM_PARTITIONS ARRAY_SIZE(partition_info)
70
71static struct map_info scx200_docflash_map = {
72	.name      = "NatSemi SCx200 DOCCS Flash",
73};
74
75static int __init init_scx200_docflash(void)
76{
77	unsigned u;
78	unsigned base;
79	unsigned ctrl;
80	unsigned pmr;
81	struct pci_dev *bridge;
82
83	printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n");
84
85	if ((bridge = pci_get_device(PCI_VENDOR_ID_NS,
86				      PCI_DEVICE_ID_NS_SCx200_BRIDGE,
87				      NULL)) == NULL)
88		return -ENODEV;
89
90	/* check that we have found the configuration block */
91	if (!scx200_cb_present()) {
92		pci_dev_put(bridge);
93		return -ENODEV;
94	}
95
96	if (probe) {
97		/* Try to use the present flash mapping if any */
98		pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base);
99		pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl);
100		pci_dev_put(bridge);
101
102		pmr = inl(scx200_cb_base + SCx200_PMR);
103
104		if (base == 0
105		    || (ctrl & 0x07000000) != 0x07000000
106		    || (ctrl & 0x0007ffff) == 0)
107			return -ENODEV;
108
109		size = ((ctrl&0x1fff)<<13) + (1<<13);
110
111		for (u = size; u > 1; u >>= 1)
112			;
113		if (u != 1)
114			return -ENODEV;
115
116		if (pmr & (1<<6))
117			width = 16;
118		else
119			width = 8;
120
121		docmem.start = base;
122		docmem.end = base + size;
123
124		if (request_resource(&iomem_resource, &docmem)) {
125			printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
126			return -ENOMEM;
127		}
128	} else {
129		pci_dev_put(bridge);
130		for (u = size; u > 1; u >>= 1)
131			;
132		if (u != 1) {
133			printk(KERN_ERR NAME ": invalid size for flash mapping\n");
134			return -EINVAL;
135		}
136
137		if (width != 8 && width != 16) {
138			printk(KERN_ERR NAME ": invalid bus width for flash mapping\n");
139			return -EINVAL;
140		}
141
142		if (allocate_resource(&iomem_resource, &docmem,
143				      size,
144				      0xc0000000, 0xffffffff,
145				      size, NULL, NULL)) {
146			printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
147			return -ENOMEM;
148		}
149
150		ctrl = 0x07000000 | ((size-1) >> 13);
151
152		printk(KERN_INFO "DOCCS BASE=0x%08lx, CTRL=0x%08lx\n", (long)docmem.start, (long)ctrl);
153
154		pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start);
155		pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl);
156		pmr = inl(scx200_cb_base + SCx200_PMR);
157
158		if (width == 8) {
159			pmr &= ~(1<<6);
160		} else {
161			pmr |= (1<<6);
162		}
163		outl(pmr, scx200_cb_base + SCx200_PMR);
164	}
165
166	printk(KERN_INFO NAME ": DOCCS mapped at %pR, width %d\n",
167	       &docmem, width);
168
169	scx200_docflash_map.size = size;
170	if (width == 8)
171		scx200_docflash_map.bankwidth = 1;
172	else
173		scx200_docflash_map.bankwidth = 2;
174
175	simple_map_init(&scx200_docflash_map);
176
177	scx200_docflash_map.phys = docmem.start;
178	scx200_docflash_map.virt = ioremap(docmem.start, scx200_docflash_map.size);
179	if (!scx200_docflash_map.virt) {
180		printk(KERN_ERR NAME ": failed to ioremap the flash\n");
181		release_resource(&docmem);
182		return -EIO;
183	}
184
185	mymtd = do_map_probe(flashtype, &scx200_docflash_map);
186	if (!mymtd) {
187		printk(KERN_ERR NAME ": unable to detect flash\n");
188		iounmap(scx200_docflash_map.virt);
189		release_resource(&docmem);
190		return -ENXIO;
191	}
192
193	if (size < mymtd->size)
194		printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n");
195
196	mymtd->owner = THIS_MODULE;
197
198	partition_info[3].offset = mymtd->size-partition_info[3].size;
199	partition_info[2].size = partition_info[3].offset-partition_info[2].offset;
200	mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);
201
202	return 0;
203}
204
205static void __exit cleanup_scx200_docflash(void)
206{
207	if (mymtd) {
208		mtd_device_unregister(mymtd);
209		map_destroy(mymtd);
210	}
211	if (scx200_docflash_map.virt) {
212		iounmap(scx200_docflash_map.virt);
213		release_resource(&docmem);
214	}
215}
216
217module_init(init_scx200_docflash);
218module_exit(cleanup_scx200_docflash);
219
220/*
221    Local variables:
222        compile-command: "make -k -C ../../.. SUBDIRS=drivers/mtd/maps modules"
223        c-basic-offset: 8
224    End:
225*/
226