diff options
Diffstat (limited to 'drivers/mtd/maps/scx200_docflash.c')
| -rw-r--r-- | drivers/mtd/maps/scx200_docflash.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/drivers/mtd/maps/scx200_docflash.c b/drivers/mtd/maps/scx200_docflash.c new file mode 100644 index 0000000000..8462662b71 --- /dev/null +++ b/drivers/mtd/maps/scx200_docflash.c @@ -0,0 +1,219 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* 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); |