228 lines
6.0 KiB
C
228 lines
6.0 KiB
C
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/*
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* Mapping of a custom board with both AMD CFI and JEDEC flash in partitions.
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* Config with both CFI and JEDEC device support.
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*
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* Basically physmap.c with the addition of partitions and
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* an array of mapping info to accommodate more than one flash type per board.
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*
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* Copyright 2005-2007 PMC-Sierra, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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#include <asm/io.h>
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#include <msp_prom.h>
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#include <msp_regs.h>
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static struct mtd_info **msp_flash;
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static struct mtd_partition **msp_parts;
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static struct map_info *msp_maps;
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static int fcnt;
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#define DEBUG_MARKER printk(KERN_NOTICE "%s[%d]\n", __func__, __LINE__)
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static int __init init_msp_flash(void)
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{
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int i, j, ret = -ENOMEM;
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int offset, coff;
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char *env;
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int pcnt;
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char flash_name[] = "flash0";
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char part_name[] = "flash0_0";
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unsigned addr, size;
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/* If ELB is disabled by "ful-mux" mode, we can't get at flash */
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if ((*DEV_ID_REG & DEV_ID_SINGLE_PC) &&
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(*ELB_1PC_EN_REG & SINGLE_PCCARD)) {
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printk(KERN_NOTICE "Single PC Card mode: no flash access\n");
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return -ENXIO;
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}
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/* examine the prom environment for flash devices */
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for (fcnt = 0; (env = prom_getenv(flash_name)); fcnt++)
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flash_name[5] = '0' + fcnt + 1;
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if (fcnt < 1)
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return -ENXIO;
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printk(KERN_NOTICE "Found %d PMC flash devices\n", fcnt);
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msp_flash = kcalloc(fcnt, sizeof(*msp_flash), GFP_KERNEL);
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if (!msp_flash)
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return -ENOMEM;
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msp_parts = kcalloc(fcnt, sizeof(*msp_parts), GFP_KERNEL);
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if (!msp_parts)
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goto free_msp_flash;
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msp_maps = kcalloc(fcnt, sizeof(*msp_maps), GFP_KERNEL);
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if (!msp_maps)
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goto free_msp_parts;
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/* loop over the flash devices, initializing each */
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for (i = 0; i < fcnt; i++) {
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/* examine the prom environment for flash partititions */
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part_name[5] = '0' + i;
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part_name[7] = '0';
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for (pcnt = 0; (env = prom_getenv(part_name)); pcnt++)
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part_name[7] = '0' + pcnt + 1;
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if (pcnt == 0) {
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printk(KERN_NOTICE "Skipping flash device %d "
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"(no partitions defined)\n", i);
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continue;
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}
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msp_parts[i] = kcalloc(pcnt, sizeof(struct mtd_partition),
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GFP_KERNEL);
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if (!msp_parts[i])
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goto cleanup_loop;
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/* now initialize the devices proper */
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flash_name[5] = '0' + i;
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env = prom_getenv(flash_name);
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if (sscanf(env, "%x:%x", &addr, &size) < 2) {
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ret = -ENXIO;
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kfree(msp_parts[i]);
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goto cleanup_loop;
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}
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addr = CPHYSADDR(addr);
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printk(KERN_NOTICE
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"MSP flash device \"%s\": 0x%08x at 0x%08x\n",
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flash_name, size, addr);
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/* This must matchs the actual size of the flash chip */
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msp_maps[i].size = size;
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msp_maps[i].phys = addr;
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/*
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* Platforms have a specific limit of the size of memory
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* which may be mapped for flash:
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*/
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if (size > CONFIG_MSP_FLASH_MAP_LIMIT)
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size = CONFIG_MSP_FLASH_MAP_LIMIT;
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msp_maps[i].virt = ioremap(addr, size);
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if (msp_maps[i].virt == NULL) {
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ret = -ENXIO;
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kfree(msp_parts[i]);
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goto cleanup_loop;
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}
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msp_maps[i].bankwidth = 1;
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msp_maps[i].name = kstrndup(flash_name, 7, GFP_KERNEL);
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if (!msp_maps[i].name) {
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iounmap(msp_maps[i].virt);
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kfree(msp_parts[i]);
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goto cleanup_loop;
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}
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for (j = 0; j < pcnt; j++) {
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part_name[5] = '0' + i;
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part_name[7] = '0' + j;
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env = prom_getenv(part_name);
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if (sscanf(env, "%x:%x:%n", &offset, &size,
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&coff) < 2) {
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ret = -ENXIO;
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kfree(msp_maps[i].name);
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iounmap(msp_maps[i].virt);
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kfree(msp_parts[i]);
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goto cleanup_loop;
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}
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msp_parts[i][j].size = size;
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msp_parts[i][j].offset = offset;
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msp_parts[i][j].name = env + coff;
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}
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/* now probe and add the device */
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simple_map_init(&msp_maps[i]);
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msp_flash[i] = do_map_probe("cfi_probe", &msp_maps[i]);
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if (msp_flash[i]) {
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msp_flash[i]->owner = THIS_MODULE;
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mtd_device_register(msp_flash[i], msp_parts[i], pcnt);
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} else {
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printk(KERN_ERR "map probe failed for flash\n");
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ret = -ENXIO;
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kfree(msp_maps[i].name);
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iounmap(msp_maps[i].virt);
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kfree(msp_parts[i]);
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goto cleanup_loop;
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}
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}
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return 0;
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cleanup_loop:
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while (i--) {
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mtd_device_unregister(msp_flash[i]);
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map_destroy(msp_flash[i]);
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kfree(msp_maps[i].name);
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iounmap(msp_maps[i].virt);
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kfree(msp_parts[i]);
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}
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kfree(msp_maps);
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free_msp_parts:
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kfree(msp_parts);
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free_msp_flash:
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kfree(msp_flash);
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return ret;
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}
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static void __exit cleanup_msp_flash(void)
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{
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int i;
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for (i = 0; i < fcnt; i++) {
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mtd_device_unregister(msp_flash[i]);
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map_destroy(msp_flash[i]);
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iounmap((void *)msp_maps[i].virt);
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/* free the memory */
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kfree(msp_maps[i].name);
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kfree(msp_parts[i]);
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}
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kfree(msp_flash);
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kfree(msp_parts);
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kfree(msp_maps);
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}
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MODULE_AUTHOR("PMC-Sierra, Inc");
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MODULE_DESCRIPTION("MTD map driver for PMC-Sierra MSP boards");
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MODULE_LICENSE("GPL");
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module_init(init_msp_flash);
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module_exit(cleanup_msp_flash);
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