MIPS: OCTEON: Use device tree to probe for flash chips.

Don't assume they are there, the device tree will tell us.

Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@auriga.com>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9461/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 37 insertions, 5 deletions

diff --git a/arch/mips/cavium-octeon/flash_setup.c b/arch/mips/cavium-octeon/flash_setup.c
index 39e26dfe7d8d..a3d609da4510 100644
--- a/arch/mips/cavium-octeon/flash_setup.c
+++ b/arch/mips/cavium-octeon/flash_setup.c
@@ -8,10 +8,11 @@
  * Copyright (C) 2007, 2008 Cavium Networks
  */
 #include <linux/kernel.h>
-#include <linux/export.h>
+#include <linux/module.h>
 #include <linux/semaphore.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/map.h>
+#include <linux/of_platform.h>
 #include <linux/mtd/partitions.h>
 
 #include <asm/octeon/octeon.h>
@@ -66,14 +67,22 @@ static void octeon_flash_map_copy_to(struct map_info *map, unsigned long to,
  *
  * Returns Zero on success
  */
-static int __init flash_init(void)
+static int octeon_flash_probe(struct platform_device *pdev)
 {
+        union cvmx_mio_boot_reg_cfgx region_cfg;
+        u32 cs;
+        int r;
+        struct device_node *np = pdev->dev.of_node;
+
+        r = of_property_read_u32(np, "reg", &cs);
+        if (r)
+                return r;
+
         /*
          * Read the bootbus region 0 setup to determine the base
          * address of the flash.
          */
-        union cvmx_mio_boot_reg_cfgx region_cfg;
-        region_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(0));
+        region_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(cs));
         if (region_cfg.s.en) {
                 /*
                  * The bootloader always takes the flash and sets its
@@ -109,4 +118,27 @@ static int __init flash_init(void)
         return 0;
 }
 
-late_initcall(flash_init);
+static const struct of_device_id of_flash_match[] = {
+        {
+                .compatible     = "cfi-flash",
+        },
+        { },
+};
+MODULE_DEVICE_TABLE(of, of_flash_match);
+
+static struct platform_driver of_flash_driver = {
+        .driver = {
+                .name = "octeon-of-flash",
+                .owner = THIS_MODULE,
+                .of_match_table = of_flash_match,
+        },
+        .probe          = octeon_flash_probe,
+};
+
+static int octeon_flash_init(void)
+{
+        return platform_driver_register(&of_flash_driver);
+}
+late_initcall(octeon_flash_init);
+
+MODULE_LICENSE("GPL");