1/* linux/drivers/mtd/maps/scx200_docflash.c
2
3   Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
4
5   $Id: scx200_docflash.c,v 1.1.1.1 2007/08/03 18:52:44 Exp $
6
7   National Semiconductor SCx200 flash mapped with DOCCS
8*/
9
10#include <linux/module.h>
11#include <linux/types.h>
12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <asm/io.h>
15#include <linux/mtd/mtd.h>
16#include <linux/mtd/map.h>
17#include <linux/mtd/partitions.h>
18
19#include <linux/pci.h>
20#include <linux/scx200.h>
21
22#define NAME "scx200_docflash"
23
24MODULE_AUTHOR("Christer Weinigel <wingel@hack.org>");
25MODULE_DESCRIPTION("NatSemi SCx200 DOCCS Flash Driver");
26MODULE_LICENSE("GPL");
27
28static int probe = 0;		/* Don't autoprobe */
29static unsigned size = 0x1000000; /* 16 MiB the whole ISA address space */
30static unsigned width = 8;	/* Default to 8 bits wide */
31static char *flashtype = "cfi_probe";
32
33module_param(probe, int, 0);
34MODULE_PARM_DESC(probe, "Probe for a BIOS mapping");
35module_param(size, int, 0);
36MODULE_PARM_DESC(size, "Size of the flash mapping");
37module_param(width, int, 0);
38MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)");
39module_param(flashtype, charp, 0);
40MODULE_PARM_DESC(flashtype, "Type of MTD probe to do");
41
42static struct resource docmem = {
43	.flags = IORESOURCE_MEM,
44	.name  = "NatSemi SCx200 DOCCS Flash",
45};
46
47static struct mtd_info *mymtd;
48
49#ifdef CONFIG_MTD_PARTITIONS
50static struct mtd_partition partition_info[] = {
51	{
52		.name   = "DOCCS Boot kernel",
53		.offset = 0,
54		.size   = 0xc0000
55	},
56	{
57		.name   = "DOCCS Low BIOS",
58		.offset = 0xc0000,
59		.size   = 0x40000
60	},
61	{
62		.name   = "DOCCS File system",
63		.offset = 0x100000,
64		.size   = ~0	/* calculate from flash size */
65	},
66	{
67		.name   = "DOCCS High BIOS",
68		.offset = ~0, 	/* calculate from flash size */
69		.size   = 0x80000
70	},
71};
72#define NUM_PARTITIONS ARRAY_SIZE(partition_info)
73#endif
74
75
76static struct map_info scx200_docflash_map = {
77	.name      = "NatSemi SCx200 DOCCS Flash",
78};
79
80static int __init init_scx200_docflash(void)
81{
82	unsigned u;
83	unsigned base;
84	unsigned ctrl;
85	unsigned pmr;
86	struct pci_dev *bridge;
87
88	printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n");
89
90	if ((bridge = pci_get_device(PCI_VENDOR_ID_NS,
91				      PCI_DEVICE_ID_NS_SCx200_BRIDGE,
92				      NULL)) == NULL)
93		return -ENODEV;
94
95	/* check that we have found the configuration block */
96	if (!scx200_cb_present()) {
97		pci_dev_put(bridge);
98		return -ENODEV;
99	}
100
101	if (probe) {
102		/* Try to use the present flash mapping if any */
103		pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base);
104		pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl);
105		pci_dev_put(bridge);
106
107		pmr = inl(scx200_cb_base + SCx200_PMR);
108
109		if (base == 0
110		    || (ctrl & 0x07000000) != 0x07000000
111		    || (ctrl & 0x0007ffff) == 0)
112			return -ENODEV;
113
114		size = ((ctrl&0x1fff)<<13) + (1<<13);
115
116		for (u = size; u > 1; u >>= 1)
117			;
118		if (u != 1)
119			return -ENODEV;
120
121		if (pmr & (1<<6))
122			width = 16;
123		else
124			width = 8;
125
126		docmem.start = base;
127		docmem.end = base + size;
128
129		if (request_resource(&iomem_resource, &docmem)) {
130			printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
131			return -ENOMEM;
132		}
133	} else {
134		pci_dev_put(bridge);
135		for (u = size; u > 1; u >>= 1)
136			;
137		if (u != 1) {
138			printk(KERN_ERR NAME ": invalid size for flash mapping\n");
139			return -EINVAL;
140		}
141
142		if (width != 8 && width != 16) {
143			printk(KERN_ERR NAME ": invalid bus width for flash mapping\n");
144			return -EINVAL;
145		}
146
147		if (allocate_resource(&iomem_resource, &docmem,
148				      size,
149				      0xc0000000, 0xffffffff,
150				      size, NULL, NULL)) {
151			printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");
152			return -ENOMEM;
153		}
154
155		ctrl = 0x07000000 | ((size-1) >> 13);
156
157		printk(KERN_INFO "DOCCS BASE=0x%08lx, CTRL=0x%08lx\n", (long)docmem.start, (long)ctrl);
158
159		pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start);
160		pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl);
161		pmr = inl(scx200_cb_base + SCx200_PMR);
162
163		if (width == 8) {
164			pmr &= ~(1<<6);
165		} else {
166			pmr |= (1<<6);
167		}
168		outl(pmr, scx200_cb_base + SCx200_PMR);
169	}
170
171       	printk(KERN_INFO NAME ": DOCCS mapped at 0x%llx-0x%llx, width %d\n",
172			(unsigned long long)docmem.start,
173			(unsigned long long)docmem.end, width);
174
175	scx200_docflash_map.size = size;
176	if (width == 8)
177		scx200_docflash_map.bankwidth = 1;
178	else
179		scx200_docflash_map.bankwidth = 2;
180
181	simple_map_init(&scx200_docflash_map);
182
183	scx200_docflash_map.phys = docmem.start;
184	scx200_docflash_map.virt = ioremap(docmem.start, scx200_docflash_map.size);
185	if (!scx200_docflash_map.virt) {
186		printk(KERN_ERR NAME ": failed to ioremap the flash\n");
187		release_resource(&docmem);
188		return -EIO;
189	}
190
191	mymtd = do_map_probe(flashtype, &scx200_docflash_map);
192	if (!mymtd) {
193		printk(KERN_ERR NAME ": unable to detect flash\n");
194		iounmap(scx200_docflash_map.virt);
195		release_resource(&docmem);
196		return -ENXIO;
197	}
198
199	if (size < mymtd->size)
200		printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n");
201
202	mymtd->owner = THIS_MODULE;
203
204#ifdef CONFIG_MTD_PARTITIONS
205	partition_info[3].offset = mymtd->size-partition_info[3].size;
206	partition_info[2].size = partition_info[3].offset-partition_info[2].offset;
207	add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS);
208#else
209	add_mtd_device(mymtd);
210#endif
211	return 0;
212}
213
214static void __exit cleanup_scx200_docflash(void)
215{
216	if (mymtd) {
217#ifdef CONFIG_MTD_PARTITIONS
218		del_mtd_partitions(mymtd);
219#else
220		del_mtd_device(mymtd);
221#endif
222		map_destroy(mymtd);
223	}
224	if (scx200_docflash_map.virt) {
225		iounmap(scx200_docflash_map.virt);
226		release_resource(&docmem);
227	}
228}
229
230module_init(init_scx200_docflash);
231module_exit(cleanup_scx200_docflash);
232
233/*
234    Local variables:
235        compile-command: "make -k -C ../../.. SUBDIRS=drivers/mtd/maps modules"
236        c-basic-offset: 8
237    End:
238*/
239