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1// SPDX-License-Identifier: GPL-2.0-only2/* linux/drivers/mtd/maps/scx200_docflash.c3 4 Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>5 6 National Semiconductor SCx200 flash mapped with DOCCS7*/8 9#include <linux/module.h>10#include <linux/types.h>11#include <linux/kernel.h>12#include <linux/init.h>13#include <asm/io.h>14#include <linux/mtd/mtd.h>15#include <linux/mtd/map.h>16#include <linux/mtd/partitions.h>17 18#include <linux/pci.h>19#include <linux/scx200.h>20 21#define NAME "scx200_docflash"22 23MODULE_AUTHOR("Christer Weinigel <wingel@hack.org>");24MODULE_DESCRIPTION("NatSemi SCx200 DOCCS Flash Driver");25MODULE_LICENSE("GPL");26 27static int probe = 0; /* Don't autoprobe */28static unsigned size = 0x1000000; /* 16 MiB the whole ISA address space */29static unsigned width = 8; /* Default to 8 bits wide */30static char *flashtype = "cfi_probe";31 32module_param(probe, int, 0);33MODULE_PARM_DESC(probe, "Probe for a BIOS mapping");34module_param(size, int, 0);35MODULE_PARM_DESC(size, "Size of the flash mapping");36module_param(width, int, 0);37MODULE_PARM_DESC(width, "Data width of the flash mapping (8/16)");38module_param(flashtype, charp, 0);39MODULE_PARM_DESC(flashtype, "Type of MTD probe to do");40 41static struct resource docmem = {42 .flags = IORESOURCE_MEM,43 .name = "NatSemi SCx200 DOCCS Flash",44};45 46static struct mtd_info *mymtd;47 48static struct mtd_partition partition_info[] = {49 {50 .name = "DOCCS Boot kernel",51 .offset = 0,52 .size = 0xc000053 },54 {55 .name = "DOCCS Low BIOS",56 .offset = 0xc0000,57 .size = 0x4000058 },59 {60 .name = "DOCCS File system",61 .offset = 0x100000,62 .size = ~0 /* calculate from flash size */63 },64 {65 .name = "DOCCS High BIOS",66 .offset = ~0, /* calculate from flash size */67 .size = 0x8000068 },69};70#define NUM_PARTITIONS ARRAY_SIZE(partition_info)71 72static struct map_info scx200_docflash_map = {73 .name = "NatSemi SCx200 DOCCS Flash",74};75 76static int __init init_scx200_docflash(void)77{78 unsigned u;79 unsigned base;80 unsigned ctrl;81 unsigned pmr;82 struct pci_dev *bridge;83 84 printk(KERN_DEBUG NAME ": NatSemi SCx200 DOCCS Flash Driver\n");85 86 if ((bridge = pci_get_device(PCI_VENDOR_ID_NS,87 PCI_DEVICE_ID_NS_SCx200_BRIDGE,88 NULL)) == NULL)89 return -ENODEV;90 91 /* check that we have found the configuration block */92 if (!scx200_cb_present()) {93 pci_dev_put(bridge);94 return -ENODEV;95 }96 97 if (probe) {98 /* Try to use the present flash mapping if any */99 pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base);100 pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl);101 pci_dev_put(bridge);102 103 pmr = inl(scx200_cb_base + SCx200_PMR);104 105 if (base == 0106 || (ctrl & 0x07000000) != 0x07000000107 || (ctrl & 0x0007ffff) == 0)108 return -ENODEV;109 110 size = ((ctrl&0x1fff)<<13) + (1<<13);111 112 for (u = size; u > 1; u >>= 1)113 ;114 if (u != 1)115 return -ENODEV;116 117 if (pmr & (1<<6))118 width = 16;119 else120 width = 8;121 122 docmem.start = base;123 docmem.end = base + size;124 125 if (request_resource(&iomem_resource, &docmem)) {126 printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");127 return -ENOMEM;128 }129 } else {130 pci_dev_put(bridge);131 for (u = size; u > 1; u >>= 1)132 ;133 if (u != 1) {134 printk(KERN_ERR NAME ": invalid size for flash mapping\n");135 return -EINVAL;136 }137 138 if (width != 8 && width != 16) {139 printk(KERN_ERR NAME ": invalid bus width for flash mapping\n");140 return -EINVAL;141 }142 143 if (allocate_resource(&iomem_resource, &docmem,144 size,145 0xc0000000, 0xffffffff,146 size, NULL, NULL)) {147 printk(KERN_ERR NAME ": unable to allocate memory for flash mapping\n");148 return -ENOMEM;149 }150 151 ctrl = 0x07000000 | ((size-1) >> 13);152 153 printk(KERN_INFO "DOCCS BASE=0x%08lx, CTRL=0x%08lx\n", (long)docmem.start, (long)ctrl);154 155 pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start);156 pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl);157 pmr = inl(scx200_cb_base + SCx200_PMR);158 159 if (width == 8) {160 pmr &= ~(1<<6);161 } else {162 pmr |= (1<<6);163 }164 outl(pmr, scx200_cb_base + SCx200_PMR);165 }166 167 printk(KERN_INFO NAME ": DOCCS mapped at %pR, width %d\n",168 &docmem, width);169 170 scx200_docflash_map.size = size;171 if (width == 8)172 scx200_docflash_map.bankwidth = 1;173 else174 scx200_docflash_map.bankwidth = 2;175 176 simple_map_init(&scx200_docflash_map);177 178 scx200_docflash_map.phys = docmem.start;179 scx200_docflash_map.virt = ioremap(docmem.start, scx200_docflash_map.size);180 if (!scx200_docflash_map.virt) {181 printk(KERN_ERR NAME ": failed to ioremap the flash\n");182 release_resource(&docmem);183 return -EIO;184 }185 186 mymtd = do_map_probe(flashtype, &scx200_docflash_map);187 if (!mymtd) {188 printk(KERN_ERR NAME ": unable to detect flash\n");189 iounmap(scx200_docflash_map.virt);190 release_resource(&docmem);191 return -ENXIO;192 }193 194 if (size < mymtd->size)195 printk(KERN_WARNING NAME ": warning, flash mapping is smaller than flash size\n");196 197 mymtd->owner = THIS_MODULE;198 199 partition_info[3].offset = mymtd->size-partition_info[3].size;200 partition_info[2].size = partition_info[3].offset-partition_info[2].offset;201 mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);202 203 return 0;204}205 206static void __exit cleanup_scx200_docflash(void)207{208 if (mymtd) {209 mtd_device_unregister(mymtd);210 map_destroy(mymtd);211 }212 if (scx200_docflash_map.virt) {213 iounmap(scx200_docflash_map.virt);214 release_resource(&docmem);215 }216}217 218module_init(init_scx200_docflash);219module_exit(cleanup_scx200_docflash);220