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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/mtd/maps/pmcmsp-flash.c
Initial import
Diffstat (limited to 'drivers/mtd/maps/pmcmsp-flash.c')
-rw-r--r--drivers/mtd/maps/pmcmsp-flash.c229
1 files changed, 229 insertions, 0 deletions
diff --git a/drivers/mtd/maps/pmcmsp-flash.c b/drivers/mtd/maps/pmcmsp-flash.c
new file mode 100644
index 000000000..744ca5cac
--- /dev/null
+++ b/drivers/mtd/maps/pmcmsp-flash.c
@@ -0,0 +1,229 @@
+/*
+ * Mapping of a custom board with both AMD CFI and JEDEC flash in partitions.
+ * Config with both CFI and JEDEC device support.
+ *
+ * Basically physmap.c with the addition of partitions and
+ * an array of mapping info to accommodate more than one flash type per board.
+ *
+ * Copyright 2005-2007 PMC-Sierra, Inc.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/io.h>
+
+#include <msp_prom.h>
+#include <msp_regs.h>
+
+
+static struct mtd_info **msp_flash;
+static struct mtd_partition **msp_parts;
+static struct map_info *msp_maps;
+static int fcnt;
+
+#define DEBUG_MARKER printk(KERN_NOTICE "%s[%d]\n", __func__, __LINE__)
+
+static int __init init_msp_flash(void)
+{
+ int i, j, ret = -ENOMEM;
+ int offset, coff;
+ char *env;
+ int pcnt;
+ char flash_name[] = "flash0";
+ char part_name[] = "flash0_0";
+ unsigned addr, size;
+
+ /* If ELB is disabled by "ful-mux" mode, we can't get at flash */
+ if ((*DEV_ID_REG & DEV_ID_SINGLE_PC) &&
+ (*ELB_1PC_EN_REG & SINGLE_PCCARD)) {
+ printk(KERN_NOTICE "Single PC Card mode: no flash access\n");
+ return -ENXIO;
+ }
+
+ /* examine the prom environment for flash devices */
+ for (fcnt = 0; (env = prom_getenv(flash_name)); fcnt++)
+ flash_name[5] = '0' + fcnt + 1;
+
+ if (fcnt < 1)
+ return -ENXIO;
+
+ printk(KERN_NOTICE "Found %d PMC flash devices\n", fcnt);
+
+ msp_flash = kmalloc(fcnt * sizeof(struct map_info *), GFP_KERNEL);
+ if (!msp_flash)
+ return -ENOMEM;
+
+ msp_parts = kmalloc(fcnt * sizeof(struct mtd_partition *), GFP_KERNEL);
+ if (!msp_parts)
+ goto free_msp_flash;
+
+ msp_maps = kcalloc(fcnt, sizeof(struct mtd_info), GFP_KERNEL);
+ if (!msp_maps)
+ goto free_msp_parts;
+
+ /* loop over the flash devices, initializing each */
+ for (i = 0; i < fcnt; i++) {
+ /* examine the prom environment for flash partititions */
+ part_name[5] = '0' + i;
+ part_name[7] = '0';
+ for (pcnt = 0; (env = prom_getenv(part_name)); pcnt++)
+ part_name[7] = '0' + pcnt + 1;
+
+ if (pcnt == 0) {
+ printk(KERN_NOTICE "Skipping flash device %d "
+ "(no partitions defined)\n", i);
+ continue;
+ }
+
+ msp_parts[i] = kcalloc(pcnt, sizeof(struct mtd_partition),
+ GFP_KERNEL);
+ if (!msp_parts[i])
+ goto cleanup_loop;
+
+ /* now initialize the devices proper */
+ flash_name[5] = '0' + i;
+ env = prom_getenv(flash_name);
+
+ if (sscanf(env, "%x:%x", &addr, &size) < 2) {
+ ret = -ENXIO;
+ kfree(msp_parts[i]);
+ goto cleanup_loop;
+ }
+ addr = CPHYSADDR(addr);
+
+ printk(KERN_NOTICE
+ "MSP flash device \"%s\": 0x%08x at 0x%08x\n",
+ flash_name, size, addr);
+ /* This must matchs the actual size of the flash chip */
+ msp_maps[i].size = size;
+ msp_maps[i].phys = addr;
+
+ /*
+ * Platforms have a specific limit of the size of memory
+ * which may be mapped for flash:
+ */
+ if (size > CONFIG_MSP_FLASH_MAP_LIMIT)
+ size = CONFIG_MSP_FLASH_MAP_LIMIT;
+
+ msp_maps[i].virt = ioremap(addr, size);
+ if (msp_maps[i].virt == NULL) {
+ ret = -ENXIO;
+ kfree(msp_parts[i]);
+ goto cleanup_loop;
+ }
+
+ msp_maps[i].bankwidth = 1;
+ msp_maps[i].name = kmalloc(7, GFP_KERNEL);
+ if (!msp_maps[i].name) {
+ iounmap(msp_maps[i].virt);
+ kfree(msp_parts[i]);
+ goto cleanup_loop;
+ }
+
+ msp_maps[i].name = strncpy(msp_maps[i].name, flash_name, 7);
+
+ for (j = 0; j < pcnt; j++) {
+ part_name[5] = '0' + i;
+ part_name[7] = '0' + j;
+
+ env = prom_getenv(part_name);
+
+ if (sscanf(env, "%x:%x:%n", &offset, &size,
+ &coff) < 2) {
+ ret = -ENXIO;
+ kfree(msp_maps[i].name);
+ iounmap(msp_maps[i].virt);
+ kfree(msp_parts[i]);
+ goto cleanup_loop;
+ }
+
+ msp_parts[i][j].size = size;
+ msp_parts[i][j].offset = offset;
+ msp_parts[i][j].name = env + coff;
+ }
+
+ /* now probe and add the device */
+ simple_map_init(&msp_maps[i]);
+ msp_flash[i] = do_map_probe("cfi_probe", &msp_maps[i]);
+ if (msp_flash[i]) {
+ msp_flash[i]->owner = THIS_MODULE;
+ mtd_device_register(msp_flash[i], msp_parts[i], pcnt);
+ } else {
+ printk(KERN_ERR "map probe failed for flash\n");
+ ret = -ENXIO;
+ kfree(msp_maps[i].name);
+ iounmap(msp_maps[i].virt);
+ kfree(msp_parts[i]);
+ goto cleanup_loop;
+ }
+ }
+
+ return 0;
+
+cleanup_loop:
+ while (i--) {
+ mtd_device_unregister(msp_flash[i]);
+ map_destroy(msp_flash[i]);
+ kfree(msp_maps[i].name);
+ iounmap(msp_maps[i].virt);
+ kfree(msp_parts[i]);
+ }
+ kfree(msp_maps);
+free_msp_parts:
+ kfree(msp_parts);
+free_msp_flash:
+ kfree(msp_flash);
+ return ret;
+}
+
+static void __exit cleanup_msp_flash(void)
+{
+ int i;
+
+ for (i = 0; i < fcnt; i++) {
+ mtd_device_unregister(msp_flash[i]);
+ map_destroy(msp_flash[i]);
+ iounmap((void *)msp_maps[i].virt);
+
+ /* free the memory */
+ kfree(msp_maps[i].name);
+ kfree(msp_parts[i]);
+ }
+
+ kfree(msp_flash);
+ kfree(msp_parts);
+ kfree(msp_maps);
+}
+
+MODULE_AUTHOR("PMC-Sierra, Inc");
+MODULE_DESCRIPTION("MTD map driver for PMC-Sierra MSP boards");
+MODULE_LICENSE("GPL");
+
+module_init(init_msp_flash);
+module_exit(cleanup_msp_flash);