You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
321 lines
7.3 KiB
321 lines
7.3 KiB
/*
|
|
* Copyright (c) 2001 Maciej W. Rozycki
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* $Id: ms02-nv.c,v 1.11 2005/11/14 13:41:47 macro Exp $
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <asm/addrspace.h>
|
|
#include <asm/bootinfo.h>
|
|
#include <asm/dec/ioasic_addrs.h>
|
|
#include <asm/dec/kn02.h>
|
|
#include <asm/dec/kn03.h>
|
|
#include <asm/io.h>
|
|
#include <asm/paccess.h>
|
|
|
|
#include "ms02-nv.h"
|
|
|
|
|
|
static char version[] __initdata =
|
|
"ms02-nv.c: v.1.0.0 13 Aug 2001 Maciej W. Rozycki.\n";
|
|
|
|
MODULE_AUTHOR("Maciej W. Rozycki <macro@linux-mips.org>");
|
|
MODULE_DESCRIPTION("DEC MS02-NV NVRAM module driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
|
|
/*
|
|
* Addresses we probe for an MS02-NV at. Modules may be located
|
|
* at any 8MiB boundary within a 0MiB up to 112MiB range or at any 32MiB
|
|
* boundary within a 0MiB up to 448MiB range. We don't support a module
|
|
* at 0MiB, though.
|
|
*/
|
|
static ulong ms02nv_addrs[] __initdata = {
|
|
0x07000000, 0x06800000, 0x06000000, 0x05800000, 0x05000000,
|
|
0x04800000, 0x04000000, 0x03800000, 0x03000000, 0x02800000,
|
|
0x02000000, 0x01800000, 0x01000000, 0x00800000
|
|
};
|
|
|
|
static const char ms02nv_name[] = "DEC MS02-NV NVRAM";
|
|
static const char ms02nv_res_diag_ram[] = "Diagnostic RAM";
|
|
static const char ms02nv_res_user_ram[] = "General-purpose RAM";
|
|
static const char ms02nv_res_csr[] = "Control and status register";
|
|
|
|
static struct mtd_info *root_ms02nv_mtd;
|
|
|
|
|
|
static int ms02nv_read(struct mtd_info *mtd, loff_t from,
|
|
size_t len, size_t *retlen, u_char *buf)
|
|
{
|
|
struct ms02nv_private *mp = mtd->priv;
|
|
|
|
if (from + len > mtd->size)
|
|
return -EINVAL;
|
|
|
|
memcpy(buf, mp->uaddr + from, len);
|
|
*retlen = len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ms02nv_write(struct mtd_info *mtd, loff_t to,
|
|
size_t len, size_t *retlen, const u_char *buf)
|
|
{
|
|
struct ms02nv_private *mp = mtd->priv;
|
|
|
|
if (to + len > mtd->size)
|
|
return -EINVAL;
|
|
|
|
memcpy(mp->uaddr + to, buf, len);
|
|
*retlen = len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static inline uint ms02nv_probe_one(ulong addr)
|
|
{
|
|
ms02nv_uint *ms02nv_diagp;
|
|
ms02nv_uint *ms02nv_magicp;
|
|
uint ms02nv_diag;
|
|
uint ms02nv_magic;
|
|
size_t size;
|
|
|
|
int err;
|
|
|
|
/*
|
|
* The firmware writes MS02NV_ID at MS02NV_MAGIC and also
|
|
* a diagnostic status at MS02NV_DIAG.
|
|
*/
|
|
ms02nv_diagp = (ms02nv_uint *)(CKSEG1ADDR(addr + MS02NV_DIAG));
|
|
ms02nv_magicp = (ms02nv_uint *)(CKSEG1ADDR(addr + MS02NV_MAGIC));
|
|
err = get_dbe(ms02nv_magic, ms02nv_magicp);
|
|
if (err)
|
|
return 0;
|
|
if (ms02nv_magic != MS02NV_ID)
|
|
return 0;
|
|
|
|
ms02nv_diag = *ms02nv_diagp;
|
|
size = (ms02nv_diag & MS02NV_DIAG_SIZE_MASK) << MS02NV_DIAG_SIZE_SHIFT;
|
|
if (size > MS02NV_CSR)
|
|
size = MS02NV_CSR;
|
|
|
|
return size;
|
|
}
|
|
|
|
static int __init ms02nv_init_one(ulong addr)
|
|
{
|
|
struct mtd_info *mtd;
|
|
struct ms02nv_private *mp;
|
|
struct resource *mod_res;
|
|
struct resource *diag_res;
|
|
struct resource *user_res;
|
|
struct resource *csr_res;
|
|
ulong fixaddr;
|
|
size_t size, fixsize;
|
|
|
|
static int version_printed;
|
|
|
|
int ret = -ENODEV;
|
|
|
|
/* The module decodes 8MiB of address space. */
|
|
mod_res = kzalloc(sizeof(*mod_res), GFP_KERNEL);
|
|
if (!mod_res)
|
|
return -ENOMEM;
|
|
|
|
mod_res->name = ms02nv_name;
|
|
mod_res->start = addr;
|
|
mod_res->end = addr + MS02NV_SLOT_SIZE - 1;
|
|
mod_res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
|
|
if (request_resource(&iomem_resource, mod_res) < 0)
|
|
goto err_out_mod_res;
|
|
|
|
size = ms02nv_probe_one(addr);
|
|
if (!size)
|
|
goto err_out_mod_res_rel;
|
|
|
|
if (!version_printed) {
|
|
printk(KERN_INFO "%s", version);
|
|
version_printed = 1;
|
|
}
|
|
|
|
ret = -ENOMEM;
|
|
mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
|
|
if (!mtd)
|
|
goto err_out_mod_res_rel;
|
|
mp = kzalloc(sizeof(*mp), GFP_KERNEL);
|
|
if (!mp)
|
|
goto err_out_mtd;
|
|
|
|
mtd->priv = mp;
|
|
mp->resource.module = mod_res;
|
|
|
|
/* Firmware's diagnostic NVRAM area. */
|
|
diag_res = kzalloc(sizeof(*diag_res), GFP_KERNEL);
|
|
if (!diag_res)
|
|
goto err_out_mp;
|
|
|
|
diag_res->name = ms02nv_res_diag_ram;
|
|
diag_res->start = addr;
|
|
diag_res->end = addr + MS02NV_RAM - 1;
|
|
diag_res->flags = IORESOURCE_BUSY;
|
|
request_resource(mod_res, diag_res);
|
|
|
|
mp->resource.diag_ram = diag_res;
|
|
|
|
/* User-available general-purpose NVRAM area. */
|
|
user_res = kzalloc(sizeof(*user_res), GFP_KERNEL);
|
|
if (!user_res)
|
|
goto err_out_diag_res;
|
|
|
|
user_res->name = ms02nv_res_user_ram;
|
|
user_res->start = addr + MS02NV_RAM;
|
|
user_res->end = addr + size - 1;
|
|
user_res->flags = IORESOURCE_BUSY;
|
|
request_resource(mod_res, user_res);
|
|
|
|
mp->resource.user_ram = user_res;
|
|
|
|
/* Control and status register. */
|
|
csr_res = kzalloc(sizeof(*csr_res), GFP_KERNEL);
|
|
if (!csr_res)
|
|
goto err_out_user_res;
|
|
|
|
csr_res->name = ms02nv_res_csr;
|
|
csr_res->start = addr + MS02NV_CSR;
|
|
csr_res->end = addr + MS02NV_CSR + 3;
|
|
csr_res->flags = IORESOURCE_BUSY;
|
|
request_resource(mod_res, csr_res);
|
|
|
|
mp->resource.csr = csr_res;
|
|
|
|
mp->addr = phys_to_virt(addr);
|
|
mp->size = size;
|
|
|
|
/*
|
|
* Hide the firmware's diagnostic area. It may get destroyed
|
|
* upon a reboot. Take paging into account for mapping support.
|
|
*/
|
|
fixaddr = (addr + MS02NV_RAM + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1);
|
|
fixsize = (size - (fixaddr - addr)) & ~(PAGE_SIZE - 1);
|
|
mp->uaddr = phys_to_virt(fixaddr);
|
|
|
|
mtd->type = MTD_RAM;
|
|
mtd->flags = MTD_CAP_RAM;
|
|
mtd->size = fixsize;
|
|
mtd->name = (char *)ms02nv_name;
|
|
mtd->owner = THIS_MODULE;
|
|
mtd->read = ms02nv_read;
|
|
mtd->write = ms02nv_write;
|
|
mtd->writesize = 1;
|
|
|
|
ret = -EIO;
|
|
if (add_mtd_device(mtd)) {
|
|
printk(KERN_ERR
|
|
"ms02-nv: Unable to register MTD device, aborting!\n");
|
|
goto err_out_csr_res;
|
|
}
|
|
|
|
printk(KERN_INFO "mtd%d: %s at 0x%08lx, size %zuMiB.\n",
|
|
mtd->index, ms02nv_name, addr, size >> 20);
|
|
|
|
mp->next = root_ms02nv_mtd;
|
|
root_ms02nv_mtd = mtd;
|
|
|
|
return 0;
|
|
|
|
|
|
err_out_csr_res:
|
|
release_resource(csr_res);
|
|
kfree(csr_res);
|
|
err_out_user_res:
|
|
release_resource(user_res);
|
|
kfree(user_res);
|
|
err_out_diag_res:
|
|
release_resource(diag_res);
|
|
kfree(diag_res);
|
|
err_out_mp:
|
|
kfree(mp);
|
|
err_out_mtd:
|
|
kfree(mtd);
|
|
err_out_mod_res_rel:
|
|
release_resource(mod_res);
|
|
err_out_mod_res:
|
|
kfree(mod_res);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit ms02nv_remove_one(void)
|
|
{
|
|
struct mtd_info *mtd = root_ms02nv_mtd;
|
|
struct ms02nv_private *mp = mtd->priv;
|
|
|
|
root_ms02nv_mtd = mp->next;
|
|
|
|
del_mtd_device(mtd);
|
|
|
|
release_resource(mp->resource.csr);
|
|
kfree(mp->resource.csr);
|
|
release_resource(mp->resource.user_ram);
|
|
kfree(mp->resource.user_ram);
|
|
release_resource(mp->resource.diag_ram);
|
|
kfree(mp->resource.diag_ram);
|
|
release_resource(mp->resource.module);
|
|
kfree(mp->resource.module);
|
|
kfree(mp);
|
|
kfree(mtd);
|
|
}
|
|
|
|
|
|
static int __init ms02nv_init(void)
|
|
{
|
|
volatile u32 *csr;
|
|
uint stride = 0;
|
|
int count = 0;
|
|
int i;
|
|
|
|
switch (mips_machtype) {
|
|
case MACH_DS5000_200:
|
|
csr = (volatile u32 *)CKSEG1ADDR(KN02_SLOT_BASE + KN02_CSR);
|
|
if (*csr & KN02_CSR_BNK32M)
|
|
stride = 2;
|
|
break;
|
|
case MACH_DS5000_2X0:
|
|
case MACH_DS5900:
|
|
csr = (volatile u32 *)CKSEG1ADDR(KN03_SLOT_BASE + IOASIC_MCR);
|
|
if (*csr & KN03_MCR_BNK32M)
|
|
stride = 2;
|
|
break;
|
|
default:
|
|
return -ENODEV;
|
|
break;
|
|
}
|
|
|
|
for (i = 0; i < ARRAY_SIZE(ms02nv_addrs); i++)
|
|
if (!ms02nv_init_one(ms02nv_addrs[i] << stride))
|
|
count++;
|
|
|
|
return (count > 0) ? 0 : -ENODEV;
|
|
}
|
|
|
|
static void __exit ms02nv_cleanup(void)
|
|
{
|
|
while (root_ms02nv_mtd)
|
|
ms02nv_remove_one();
|
|
}
|
|
|
|
|
|
module_init(ms02nv_init);
|
|
module_exit(ms02nv_cleanup);
|
|
|