Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / mtd / maps / uclinux.c

diff --git a/kernel/drivers/mtd/maps/uclinux.c b/kernel/drivers/mtd/maps/uclinux.c
new file mode 100644 (file)
index 0000000..c1af83d
--- /dev/null
+++ b/kernel/drivers/mtd/maps/uclinux.c
@@ -0,0 +1,143 @@
+/****************************************************************************/
+
+/*
+ *     uclinux.c -- generic memory mapped MTD driver for uclinux
+ *
+ *     (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com)
+ */
+
+/****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/major.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+#include <asm/io.h>
+#include <asm/sections.h>
+
+/****************************************************************************/
+
+#ifdef CONFIG_MTD_ROM
+#define MAP_NAME "rom"
+#else
+#define MAP_NAME "ram"
+#endif
+
+/*
+ * Blackfin uses uclinux_ram_map during startup, so it must not be static.
+ * Provide a dummy declaration to make sparse happy.
+ */
+extern struct map_info uclinux_ram_map;
+
+struct map_info uclinux_ram_map = {
+       .name = MAP_NAME,
+       .size = 0,
+};
+
+static unsigned long physaddr = -1;
+module_param(physaddr, ulong, S_IRUGO);
+
+static struct mtd_info *uclinux_ram_mtdinfo;
+
+/****************************************************************************/
+
+static struct mtd_partition uclinux_romfs[] = {
+       { .name = "ROMfs" }
+};
+
+#define        NUM_PARTITIONS  ARRAY_SIZE(uclinux_romfs)
+
+/****************************************************************************/
+
+static int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,
+       size_t *retlen, void **virt, resource_size_t *phys)
+{
+       struct map_info *map = mtd->priv;
+       *virt = map->virt + from;
+       if (phys)
+               *phys = map->phys + from;
+       *retlen = len;
+       return(0);
+}
+
+/****************************************************************************/
+
+static int __init uclinux_mtd_init(void)
+{
+       struct mtd_info *mtd;
+       struct map_info *mapp;
+
+       mapp = &uclinux_ram_map;
+
+       if (physaddr == -1)
+               mapp->phys = (resource_size_t)__bss_stop;
+       else
+               mapp->phys = physaddr;
+
+       if (!mapp->size)
+               mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8))));
+       mapp->bankwidth = 4;
+
+       printk("uclinux[mtd]: probe address=0x%x size=0x%x\n",
+               (int) mapp->phys, (int) mapp->size);
+
+       /*
+        * The filesystem is guaranteed to be in direct mapped memory. It is
+        * directly following the kernels own bss region. Following the same
+        * mechanism used by architectures setting up traditional initrds we
+        * use phys_to_virt to get the virtual address of its start.
+        */
+       mapp->virt = phys_to_virt(mapp->phys);
+
+       if (mapp->virt == 0) {
+               printk("uclinux[mtd]: no virtual mapping?\n");
+               return(-EIO);
+       }
+
+       simple_map_init(mapp);
+
+       mtd = do_map_probe("map_" MAP_NAME, mapp);
+       if (!mtd) {
+               printk("uclinux[mtd]: failed to find a mapping?\n");
+               return(-ENXIO);
+       }
+
+       mtd->owner = THIS_MODULE;
+       mtd->_point = uclinux_point;
+       mtd->priv = mapp;
+
+       uclinux_ram_mtdinfo = mtd;
+       mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS);
+
+       return(0);
+}
+
+/****************************************************************************/
+
+static void __exit uclinux_mtd_cleanup(void)
+{
+       if (uclinux_ram_mtdinfo) {
+               mtd_device_unregister(uclinux_ram_mtdinfo);
+               map_destroy(uclinux_ram_mtdinfo);
+               uclinux_ram_mtdinfo = NULL;
+       }
+       if (uclinux_ram_map.virt)
+               uclinux_ram_map.virt = 0;
+}
+
+/****************************************************************************/
+
+module_init(uclinux_mtd_init);
+module_exit(uclinux_mtd_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
+MODULE_DESCRIPTION("Generic MTD for uClinux");
+
+/****************************************************************************/