[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>

1 files changed, 105 insertions, 0 deletions

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);