MIPS: ath25: register AR5312 flash controller
authorSergey Ryazanov <ryazanov.s.a@gmail.com>
Tue, 28 Oct 2014 23:18:46 +0000 (03:18 +0400)
committerRalf Baechle <ralf@linux-mips.org>
Mon, 24 Nov 2014 06:45:28 +0000 (07:45 +0100)
AR5312 SoC flash controller maps the flash content to memory and
translates the memory access operations to the flash access operations.
Such controller is fully supported by the physmap-flash driver.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>R5312 SoC flash
Cc: Linux MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/8245/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
arch/mips/ath25/ar5312.c

index 26942a2c298d26aa78e0a9a61587527661519009..383dd6c38e0ab457b1ca740ecf9ed62b4a936a6a 100644 (file)
@@ -19,6 +19,8 @@
 #include <linux/bitops.h>
 #include <linux/irqdomain.h>
 #include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/mtd/physmap.h>
 #include <linux/reboot.h>
 #include <asm/bootinfo.h>
 #include <asm/reboot.h>
@@ -160,6 +162,24 @@ void __init ar5312_arch_init_irq(void)
        ar5312_misc_irq_domain = domain;
 }
 
+static struct physmap_flash_data ar5312_flash_data = {
+       .width = 2,
+};
+
+static struct resource ar5312_flash_resource = {
+       .start = AR5312_FLASH_BASE,
+       .end = AR5312_FLASH_BASE + AR5312_FLASH_SIZE - 1,
+       .flags = IORESOURCE_MEM,
+};
+
+static struct platform_device ar5312_physmap_flash = {
+       .name = "physmap-flash",
+       .id = 0,
+       .dev.platform_data = &ar5312_flash_data,
+       .resource = &ar5312_flash_resource,
+       .num_resources = 1,
+};
+
 static void __init ar5312_flash_init(void)
 {
        void __iomem *flashctl_base;
@@ -168,12 +188,24 @@ static void __init ar5312_flash_init(void)
        flashctl_base = ioremap_nocache(AR5312_FLASHCTL_BASE,
                                        AR5312_FLASHCTL_SIZE);
 
+       ctl = __raw_readl(flashctl_base + AR5312_FLASHCTL0);
+       ctl &= AR5312_FLASHCTL_MW;
+
+       /* fixup flash width */
+       switch (ctl) {
+       case AR5312_FLASHCTL_MW16:
+               ar5312_flash_data.width = 2;
+               break;
+       case AR5312_FLASHCTL_MW8:
+       default:
+               ar5312_flash_data.width = 1;
+               break;
+       }
+
        /*
         * Configure flash bank 0.
         * Assume 8M window size. Flash will be aliased if it's smaller
         */
-       ctl = __raw_readl(flashctl_base + AR5312_FLASHCTL0);
-       ctl &= AR5312_FLASHCTL_MW;
        ctl |= AR5312_FLASHCTL_E | AR5312_FLASHCTL_AC_8M | AR5312_FLASHCTL_RBLE;
        ctl |= 0x01 << AR5312_FLASHCTL_IDCY_S;
        ctl |= 0x07 << AR5312_FLASHCTL_WST1_S;
@@ -212,6 +244,8 @@ void __init ar5312_init_devices(void)
        /* Everything else is probably AR5312 or compatible */
        else
                ath25_soc = ATH25_SOC_AR5312;
+
+       platform_device_register(&ar5312_physmap_flash);
 }
 
 static void ar5312_restart(char *command)