[MTD] PMC MSP71xx flash/rootfs mappings

Add flash and rootfs mappings for the PMC-Sierra MSP71xx devices.

This patch references some platform support files previously submitted to
the linux-mips@linux-mips.org list.

Signed-off-by: Marc St-Jean <Marc_St-Jean@pmc-sierra.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

4 files changed, 324 insertions, 0 deletions

diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index bbf0553bdb2e..5e651721ddb9 100644
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -69,6 +69,39 @@ config MTD_PHYSMAP_OF
           physically into the CPU's memory. The mapping description here is
           taken from OF device tree.
 
+config MTD_PMC_MSP_EVM
+        tristate "CFI Flash device mapped on PMC-Sierra MSP"
+        depends on PMC_MSP && MTD_CFI
+        select MTD_PARTITIONS
+        help
+          This provides a 'mapping' driver which support the way
+          in which user-programmable flash chips are connected on the
+          PMC-Sierra MSP eval/demo boards
+
+choice
+        prompt "Maximum mappable memory avialable for flash IO"
+        depends on MTD_PMC_MSP_EVM
+        default MSP_FLASH_MAP_LIMIT_32M
+
+config MSP_FLASH_MAP_LIMIT_32M
+        bool "32M"
+
+endchoice
+
+config MSP_FLASH_MAP_LIMIT
+        hex
+        default "0x02000000"
+        depends on MSP_FLASH_MAP_LIMIT_32M
+
+config MTD_PMC_MSP_RAMROOT
+        tristate "Embedded RAM block device for root on PMC-Sierra MSP"
+        depends on PMC_MSP_EMBEDDED_ROOTFS && \
+                        (MTD_BLOCK || MTD_BLOCK_RO) && \
+                        MTD_RAM
+        help
+          This provides support for the embedded root file system
+          on PMC MSP devices.  This memory is mapped as a MTD block device.
+
 config MTD_SUN_UFLASH
         tristate "Sun Microsystems userflash support"
         depends on SPARC && MTD_CFI
diff --git a/drivers/mtd/maps/Makefile b/drivers/mtd/maps/Makefile
index 071d0bf922b6..de036c5e6139 100644
--- a/drivers/mtd/maps/Makefile
+++ b/drivers/mtd/maps/Makefile
@@ -27,6 +27,8 @@ obj-$(CONFIG_MTD_CEIVA)		+= ceiva.o
 obj-$(CONFIG_MTD_OCTAGON)       += octagon-5066.o
 obj-$(CONFIG_MTD_PHYSMAP)       += physmap.o
 obj-$(CONFIG_MTD_PHYSMAP_OF)    += physmap_of.o
+obj-$(CONFIG_MTD_PMC_MSP_EVM)   += pmcmsp-flash.o
+obj-$(CONFIG_MTD_PMC_MSP_RAMROOT)+= pmcmsp-ramroot.o
 obj-$(CONFIG_MTD_PNC2000)       += pnc2000.o
 obj-$(CONFIG_MTD_PCMCIA)        += pcmciamtd.o
 obj-$(CONFIG_MTD_RPXLITE)       += rpxlite.o
diff --git a/drivers/mtd/maps/pmcmsp-flash.c b/drivers/mtd/maps/pmcmsp-flash.c
new file mode 100644
index 000000000000..7e0377ec1c40
--- /dev/null
+++ b/drivers/mtd/maps/pmcmsp-flash.c
@@ -0,0 +1,184 @@
+/*
+ * 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 accomodate 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/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",__FUNCTION__,__LINE__)
+
+int __init init_msp_flash(void)
+{
+        int i, j;
+        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 = (struct mtd_info **)kmalloc(
+                        fcnt * sizeof(struct map_info *), GFP_KERNEL);
+        msp_parts = (struct mtd_partition **)kmalloc(
+                        fcnt * sizeof(struct mtd_partition *), GFP_KERNEL);
+        msp_maps = (struct map_info *)kmalloc(
+                        fcnt * sizeof(struct mtd_info), GFP_KERNEL);
+        memset(msp_maps, 0, fcnt * sizeof(struct mtd_info));
+
+        /* 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] = (struct mtd_partition *)kmalloc(
+                        pcnt * sizeof(struct mtd_partition), GFP_KERNEL);
+                memset(msp_parts[i], 0, pcnt * sizeof(struct mtd_partition));
+
+                /* now initialize the devices proper */
+                flash_name[5] = '0' + i;
+                env = prom_getenv(flash_name);
+
+                if (sscanf(env, "%x:%x", &addr, &size) < 2)
+                        return -ENXIO;
+                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);
+                msp_maps[i].bankwidth = 1;
+                msp_maps[i].name = strncpy(kmalloc(7, GFP_KERNEL),
+                                        flash_name, 7);
+
+                if (msp_maps[i].virt == NULL)
+                        return -ENXIO;
+
+                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)
+                                return -ENXIO;
+
+                        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;
+                        add_mtd_partitions(msp_flash[i], msp_parts[i], pcnt);
+                } else {
+                        printk(KERN_ERR "map probe failed for flash\n");
+                        return -ENXIO;
+                }
+        }
+
+        return 0;
+}
+
+static void __exit cleanup_msp_flash(void)
+{
+        int i;
+
+        for (i = 0; i < sizeof(msp_flash) / sizeof(struct mtd_info **); i++) {
+                del_mtd_partitions(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);
diff --git a/drivers/mtd/maps/pmcmsp-ramroot.c b/drivers/mtd/maps/pmcmsp-ramroot.c
new file mode 100644
index 000000000000..18049bceba8d
--- /dev/null
+++ b/drivers/mtd/maps/pmcmsp-ramroot.c
@@ -0,0 +1,105 @@
+/*
+ * Mapping of the rootfs in a physical region of memory
+ *
+ * Copyright (C) 2005-2007 PMC-Sierra Inc.
+ * Author: Andrew Hughes, Andrew_Hughes@pmc-sierra.com
+ *
+ *  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/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/root_dev.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+
+#include <asm/io.h>
+
+#include <msp_prom.h>
+
+static struct mtd_info *rr_mtd;
+
+struct map_info rr_map = {
+        .name = "ramroot",
+        .bankwidth = 4,
+};
+
+static int __init init_rrmap(void)
+{
+        void *ramroot_start;
+        unsigned long ramroot_size;
+
+        /* Check for supported rootfs types */
+        if (get_ramroot(&ramroot_start, &ramroot_size)) {
+                rr_map.phys = CPHYSADDR(ramroot_start);
+                rr_map.size = ramroot_size;
+
+                printk(KERN_NOTICE
+                        "PMC embedded root device: 0x%08lx @ 0x%08lx\n",
+                        rr_map.size, (unsigned long)rr_map.phys);
+        } else {
+                printk(KERN_ERR
+                        "init_rrmap: no supported embedded rootfs detected!\n");
+                return -ENXIO;
+        }
+
+        /* Map rootfs to I/O space for block device driver */
+        rr_map.virt = ioremap(rr_map.phys, rr_map.size);
+        if (!rr_map.virt) {
+                printk(KERN_ERR "Failed to ioremap\n");
+                return -EIO;
+        }
+
+        simple_map_init(&rr_map);
+
+        rr_mtd = do_map_probe("map_ram", &rr_map);
+        if (rr_mtd) {
+                rr_mtd->owner = THIS_MODULE;
+
+                add_mtd_device(rr_mtd);
+                ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, rr_mtd->index);
+
+                return 0;
+        }
+
+        iounmap(rr_map.virt);
+        return -ENXIO;
+}
+
+static void __exit cleanup_rrmap(void)
+{
+        del_mtd_device(rr_mtd);
+        map_destroy(rr_mtd);
+
+        iounmap(rr_map.virt);
+        rr_map.virt = NULL;
+}
+
+MODULE_AUTHOR("PMC-Sierra, Inc");
+MODULE_DESCRIPTION("MTD map driver for embedded PMC-Sierra MSP filesystem");
+MODULE_LICENSE("GPL");
+
+module_init(init_rrmap);
+module_exit(cleanup_rrmap);