307 lines
7.0 KiB
C
307 lines
7.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2001 Maciej W. Rozycki
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*/
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mtd/mtd.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <asm/addrspace.h>
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#include <asm/bootinfo.h>
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#include <asm/dec/ioasic_addrs.h>
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#include <asm/dec/kn02.h>
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#include <asm/dec/kn03.h>
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#include <asm/io.h>
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#include <asm/paccess.h>
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#include "ms02-nv.h"
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static char version[] __initdata =
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"ms02-nv.c: v.1.0.0 13 Aug 2001 Maciej W. Rozycki.\n";
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MODULE_AUTHOR("Maciej W. Rozycki <macro@linux-mips.org>");
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MODULE_DESCRIPTION("DEC MS02-NV NVRAM module driver");
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MODULE_LICENSE("GPL");
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/*
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* Addresses we probe for an MS02-NV at. Modules may be located
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* at any 8MiB boundary within a 0MiB up to 112MiB range or at any 32MiB
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* boundary within a 0MiB up to 448MiB range. We don't support a module
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* at 0MiB, though.
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*/
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static ulong ms02nv_addrs[] __initdata = {
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0x07000000, 0x06800000, 0x06000000, 0x05800000, 0x05000000,
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0x04800000, 0x04000000, 0x03800000, 0x03000000, 0x02800000,
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0x02000000, 0x01800000, 0x01000000, 0x00800000
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};
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static const char ms02nv_name[] = "DEC MS02-NV NVRAM";
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static const char ms02nv_res_diag_ram[] = "Diagnostic RAM";
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static const char ms02nv_res_user_ram[] = "General-purpose RAM";
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static const char ms02nv_res_csr[] = "Control and status register";
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static struct mtd_info *root_ms02nv_mtd;
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static int ms02nv_read(struct mtd_info *mtd, loff_t from,
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size_t len, size_t *retlen, u_char *buf)
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{
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struct ms02nv_private *mp = mtd->priv;
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memcpy(buf, mp->uaddr + from, len);
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*retlen = len;
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return 0;
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}
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static int ms02nv_write(struct mtd_info *mtd, loff_t to,
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size_t len, size_t *retlen, const u_char *buf)
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{
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struct ms02nv_private *mp = mtd->priv;
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memcpy(mp->uaddr + to, buf, len);
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*retlen = len;
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return 0;
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}
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static inline uint ms02nv_probe_one(ulong addr)
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{
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ms02nv_uint *ms02nv_diagp;
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ms02nv_uint *ms02nv_magicp;
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uint ms02nv_diag;
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uint ms02nv_magic;
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size_t size;
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int err;
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/*
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* The firmware writes MS02NV_ID at MS02NV_MAGIC and also
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* a diagnostic status at MS02NV_DIAG.
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*/
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ms02nv_diagp = (ms02nv_uint *)(CKSEG1ADDR(addr + MS02NV_DIAG));
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ms02nv_magicp = (ms02nv_uint *)(CKSEG1ADDR(addr + MS02NV_MAGIC));
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err = get_dbe(ms02nv_magic, ms02nv_magicp);
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if (err)
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return 0;
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if (ms02nv_magic != MS02NV_ID)
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return 0;
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ms02nv_diag = *ms02nv_diagp;
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size = (ms02nv_diag & MS02NV_DIAG_SIZE_MASK) << MS02NV_DIAG_SIZE_SHIFT;
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if (size > MS02NV_CSR)
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size = MS02NV_CSR;
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return size;
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}
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static int __init ms02nv_init_one(ulong addr)
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{
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struct mtd_info *mtd;
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struct ms02nv_private *mp;
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struct resource *mod_res;
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struct resource *diag_res;
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struct resource *user_res;
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struct resource *csr_res;
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ulong fixaddr;
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size_t size, fixsize;
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static int version_printed;
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int ret = -ENODEV;
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/* The module decodes 8MiB of address space. */
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mod_res = kzalloc(sizeof(*mod_res), GFP_KERNEL);
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if (!mod_res)
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return -ENOMEM;
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mod_res->name = ms02nv_name;
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mod_res->start = addr;
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mod_res->end = addr + MS02NV_SLOT_SIZE - 1;
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mod_res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
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if (request_resource(&iomem_resource, mod_res) < 0)
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goto err_out_mod_res;
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size = ms02nv_probe_one(addr);
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if (!size)
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goto err_out_mod_res_rel;
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if (!version_printed) {
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printk(KERN_INFO "%s", version);
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version_printed = 1;
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}
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ret = -ENOMEM;
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mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
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if (!mtd)
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goto err_out_mod_res_rel;
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mp = kzalloc(sizeof(*mp), GFP_KERNEL);
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if (!mp)
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goto err_out_mtd;
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mtd->priv = mp;
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mp->resource.module = mod_res;
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/* Firmware's diagnostic NVRAM area. */
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diag_res = kzalloc(sizeof(*diag_res), GFP_KERNEL);
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if (!diag_res)
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goto err_out_mp;
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diag_res->name = ms02nv_res_diag_ram;
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diag_res->start = addr;
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diag_res->end = addr + MS02NV_RAM - 1;
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diag_res->flags = IORESOURCE_BUSY;
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request_resource(mod_res, diag_res);
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mp->resource.diag_ram = diag_res;
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/* User-available general-purpose NVRAM area. */
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user_res = kzalloc(sizeof(*user_res), GFP_KERNEL);
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if (!user_res)
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goto err_out_diag_res;
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user_res->name = ms02nv_res_user_ram;
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user_res->start = addr + MS02NV_RAM;
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user_res->end = addr + size - 1;
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user_res->flags = IORESOURCE_BUSY;
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request_resource(mod_res, user_res);
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mp->resource.user_ram = user_res;
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/* Control and status register. */
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csr_res = kzalloc(sizeof(*csr_res), GFP_KERNEL);
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if (!csr_res)
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goto err_out_user_res;
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csr_res->name = ms02nv_res_csr;
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csr_res->start = addr + MS02NV_CSR;
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csr_res->end = addr + MS02NV_CSR + 3;
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csr_res->flags = IORESOURCE_BUSY;
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request_resource(mod_res, csr_res);
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mp->resource.csr = csr_res;
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mp->addr = phys_to_virt(addr);
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mp->size = size;
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/*
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* Hide the firmware's diagnostic area. It may get destroyed
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* upon a reboot. Take paging into account for mapping support.
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*/
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fixaddr = (addr + MS02NV_RAM + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1);
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fixsize = (size - (fixaddr - addr)) & ~(PAGE_SIZE - 1);
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mp->uaddr = phys_to_virt(fixaddr);
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mtd->type = MTD_RAM;
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mtd->flags = MTD_CAP_RAM;
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mtd->size = fixsize;
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mtd->name = ms02nv_name;
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mtd->owner = THIS_MODULE;
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mtd->_read = ms02nv_read;
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mtd->_write = ms02nv_write;
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mtd->writesize = 1;
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ret = -EIO;
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if (mtd_device_register(mtd, NULL, 0)) {
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printk(KERN_ERR
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"ms02-nv: Unable to register MTD device, aborting!\n");
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goto err_out_csr_res;
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}
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printk(KERN_INFO "mtd%d: %s at 0x%08lx, size %zuMiB.\n",
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mtd->index, ms02nv_name, addr, size >> 20);
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mp->next = root_ms02nv_mtd;
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root_ms02nv_mtd = mtd;
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return 0;
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err_out_csr_res:
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release_resource(csr_res);
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kfree(csr_res);
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err_out_user_res:
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release_resource(user_res);
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kfree(user_res);
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err_out_diag_res:
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release_resource(diag_res);
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kfree(diag_res);
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err_out_mp:
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kfree(mp);
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err_out_mtd:
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kfree(mtd);
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err_out_mod_res_rel:
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release_resource(mod_res);
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err_out_mod_res:
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kfree(mod_res);
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return ret;
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}
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static void __exit ms02nv_remove_one(void)
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{
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struct mtd_info *mtd = root_ms02nv_mtd;
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struct ms02nv_private *mp = mtd->priv;
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root_ms02nv_mtd = mp->next;
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mtd_device_unregister(mtd);
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release_resource(mp->resource.csr);
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kfree(mp->resource.csr);
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release_resource(mp->resource.user_ram);
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kfree(mp->resource.user_ram);
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release_resource(mp->resource.diag_ram);
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kfree(mp->resource.diag_ram);
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release_resource(mp->resource.module);
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kfree(mp->resource.module);
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kfree(mp);
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kfree(mtd);
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}
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static int __init ms02nv_init(void)
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{
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volatile u32 *csr;
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uint stride = 0;
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int count = 0;
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int i;
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switch (mips_machtype) {
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case MACH_DS5000_200:
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csr = (volatile u32 *)CKSEG1ADDR(KN02_SLOT_BASE + KN02_CSR);
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if (*csr & KN02_CSR_BNK32M)
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stride = 2;
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break;
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case MACH_DS5000_2X0:
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case MACH_DS5900:
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csr = (volatile u32 *)CKSEG1ADDR(KN03_SLOT_BASE + IOASIC_MCR);
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if (*csr & KN03_MCR_BNK32M)
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stride = 2;
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break;
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default:
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return -ENODEV;
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}
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for (i = 0; i < ARRAY_SIZE(ms02nv_addrs); i++)
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if (!ms02nv_init_one(ms02nv_addrs[i] << stride))
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count++;
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return (count > 0) ? 0 : -ENODEV;
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}
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static void __exit ms02nv_cleanup(void)
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{
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while (root_ms02nv_mtd)
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ms02nv_remove_one();
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}
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module_init(ms02nv_init);
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module_exit(ms02nv_cleanup);
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