MTD: nand: make au1550nd.c a platform_driver

Transform the au1550nd.c driver into a platform_driver and hook it
up in the PB1550 board (gen_nand works fine on the DB1550, but since
I don't have a PB1550 to test this driver stays for now).

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
Cc: linux-mtd@lists.infradead.org
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2875/
Patchwork: https://patchwork.linux-mips.org/patch/3160/
Acked-by: Artem Bityutskiy <dedekind1@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 66 insertions, 0 deletions

diff --git a/arch/mips/alchemy/devboards/pb1550.c b/arch/mips/alchemy/devboards/pb1550.c
index e4a00a56a20f..b37e7de8d920 100644
--- a/arch/mips/alchemy/devboards/pb1550.c
+++ b/arch/mips/alchemy/devboards/pb1550.c
@@ -24,6 +24,7 @@
 #include <linux/platform_device.h>
 #include <asm/mach-au1x00/au1000.h>
 #include <asm/mach-au1x00/au1xxx_dbdma.h>
+#include <asm/mach-au1x00/au1550nd.h>
 #include <asm/mach-au1x00/gpio.h>
 #include <asm/mach-db1x00/bcsr.h>
 #include "platform.h"
@@ -131,6 +132,67 @@ static struct platform_device pb1550_i2c_dev = {
         .resource       = au1550_psc2_res,
 };
 
+static struct mtd_partition pb1550_nand_parts[] = {
+        [0] = {
+                .name   = "NAND FS 0",
+                .offset = 0,
+                .size   = 8 * 1024 * 1024,
+        },
+        [1] = {
+                .name   = "NAND FS 1",
+                .offset = MTDPART_OFS_APPEND,
+                .size   = MTDPART_SIZ_FULL,
+        },
+};
+
+static struct au1550nd_platdata pb1550_nand_pd = {
+        .parts          = pb1550_nand_parts,
+        .num_parts      = ARRAY_SIZE(pb1550_nand_parts),
+        .devwidth       = 0,    /* x8 NAND default, needs fixing up */
+};
+
+static struct resource pb1550_nand_res[] = {
+        [0] = {
+                .start  = 0x20000000,
+                .end    = 0x20000fff,
+                .flags  = IORESOURCE_MEM,
+        },
+};
+
+static struct platform_device pb1550_nand_dev = {
+        .name           = "au1550-nand",
+        .id             = -1,
+        .resource       = pb1550_nand_res,
+        .num_resources  = ARRAY_SIZE(pb1550_nand_res),
+        .dev            = {
+                .platform_data  = &pb1550_nand_pd,
+        },
+};
+
+static void __init pb1550_nand_setup(void)
+{
+        int boot_swapboot = (au_readl(MEM_STSTAT) & (0x7 << 1)) |
+                            ((bcsr_read(BCSR_STATUS) >> 6) & 0x1);
+
+        switch (boot_swapboot) {
+        case 0:
+        case 2:
+        case 8:
+        case 0xC:
+        case 0xD:
+                /* x16 NAND Flash */
+                pb1550_nand_pd.devwidth = 1;
+                /* fallthrough */
+        case 1:
+        case 9:
+        case 3:
+        case 0xE:
+        case 0xF:
+                /* x8 NAND, already set up */
+                platform_device_register(&pb1550_nand_dev);
+        }
+}
+
 static int __init pb1550_dev_init(void)
 {
         int swapped;
@@ -168,6 +230,10 @@ static int __init pb1550_dev_init(void)
                 AU1000_PCMCIA_IO_PHYS_ADDR   + 0x008010000 - 1,
                 AU1550_GPIO201_205_INT, AU1550_GPIO1_INT, 0, 0, 1);
 
+        /* NAND setup */
+        gpio_direction_input(206);      /* GPIO206 high */
+        pb1550_nand_setup();
+
         swapped = bcsr_read(BCSR_STATUS) & BCSR_STATUS_PB1550_SWAPBOOT;
         db1x_register_norflash(128 * 1024 * 1024, 4, swapped);
         platform_device_register(&pb1550_pci_host);