[ARM] orion5x: ts78xx add NAND support via plat_nand

ts78xx add NAND support via plat_nand

Signed-off-by: Alexander Clouter <alex@digriz.org.uk>
Signed-off-by: Nicolas Pitre <nico@cam.org>

2 files changed, 133 insertions, 0 deletions

diff --git a/arch/arm/mach-orion5x/ts78xx-fpga.h b/arch/arm/mach-orion5x/ts78xx-fpga.h
index 0b8e30faff14..e2c503c7807e 100644
--- a/arch/arm/mach-orion5x/ts78xx-fpga.h
+++ b/arch/arm/mach-orion5x/ts78xx-fpga.h
@@ -17,6 +17,7 @@ struct fpga_device {
 struct fpga_devices {
         /* Technologic Systems */
         struct fpga_device      ts_rtc;
+        struct fpga_device      ts_nand;
 };
 
 struct ts78xx_fpga_data {
diff --git a/arch/arm/mach-orion5x/ts78xx-setup.c b/arch/arm/mach-orion5x/ts78xx-setup.c
index 640b44db5a3f..a6eec4e49424 100644
--- a/arch/arm/mach-orion5x/ts78xx-setup.c
+++ b/arch/arm/mach-orion5x/ts78xx-setup.c
@@ -15,6 +15,8 @@
 #include <linux/mv643xx_eth.h>
 #include <linux/ata_platform.h>
 #include <linux/m48t86.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
@@ -151,11 +153,129 @@ static void ts78xx_ts_rtc_unload(void)
 }
 
 /*****************************************************************************
+ * NAND Flash
+ ****************************************************************************/
+#define TS_NAND_CTRL    (TS78XX_FPGA_REGS_VIRT_BASE | 0x800)    /* VIRT */
+#define TS_NAND_DATA    (TS78XX_FPGA_REGS_PHYS_BASE | 0x804)    /* PHYS */
+
+/*
+ * hardware specific access to control-lines
+ *
+ * ctrl:
+ * NAND_NCE: bit 0 -> bit 2
+ * NAND_CLE: bit 1 -> bit 1
+ * NAND_ALE: bit 2 -> bit 0
+ */
+static void ts78xx_ts_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
+                        unsigned int ctrl)
+{
+        struct nand_chip *this = mtd->priv;
+
+        if (ctrl & NAND_CTRL_CHANGE) {
+                unsigned char bits;
+
+                bits = (ctrl & NAND_NCE) << 2;
+                bits |= ctrl & NAND_CLE;
+                bits |= (ctrl & NAND_ALE) >> 2;
+
+                writeb((readb(TS_NAND_CTRL) & ~0x7) | bits, TS_NAND_CTRL);
+        }
+
+        if (cmd != NAND_CMD_NONE)
+                writeb(cmd, this->IO_ADDR_W);
+}
+
+static int ts78xx_ts_nand_dev_ready(struct mtd_info *mtd)
+{
+        return readb(TS_NAND_CTRL) & 0x20;
+}
+
+const char *ts_nand_part_probes[] = { "cmdlinepart", NULL };
+
+static struct mtd_partition ts78xx_ts_nand_parts[] = {
+        {
+                .name           = "mbr",
+                .offset         = 0,
+                .size           = SZ_128K,
+                .mask_flags     = MTD_WRITEABLE,
+        }, {
+                .name           = "kernel",
+                .offset         = MTDPART_OFS_APPEND,
+                .size           = SZ_4M,
+        }, {
+                .name           = "initrd",
+                .offset         = MTDPART_OFS_APPEND,
+                .size           = SZ_4M,
+        }, {
+                .name           = "rootfs",
+                .offset         = MTDPART_OFS_APPEND,
+                .size           = MTDPART_SIZ_FULL,
+        }
+};
+
+static struct platform_nand_data ts78xx_ts_nand_data = {
+        .chip   = {
+                .part_probe_types       = ts_nand_part_probes,
+                .partitions             = ts78xx_ts_nand_parts,
+                .nr_partitions          = ARRAY_SIZE(ts78xx_ts_nand_parts),
+                .chip_delay             = 15,
+                .options                = NAND_USE_FLASH_BBT,
+        },
+        .ctrl   = {
+                /*
+                 * The HW ECC offloading functions, used to give about a 9%
+                 * performance increase for 'dd if=/dev/mtdblockX' and 5% for
+                 * nanddump.  This all however was changed by git commit
+                 * e6cf5df1838c28bb060ac45b5585e48e71bbc740 so now there is
+                 * no performance advantage to be had so we no longer bother
+                 */
+                .cmd_ctrl               = ts78xx_ts_nand_cmd_ctrl,
+                .dev_ready              = ts78xx_ts_nand_dev_ready,
+        },
+};
+
+static struct resource ts78xx_ts_nand_resources = {
+        .start          = TS_NAND_DATA,
+        .end            = TS_NAND_DATA + 4,
+        .flags          = IORESOURCE_IO,
+};
+
+static struct platform_device ts78xx_ts_nand_device = {
+        .name           = "gen_nand",
+        .id             = -1,
+        .dev            = {
+                .platform_data  = &ts78xx_ts_nand_data,
+        },
+        .resource       = &ts78xx_ts_nand_resources,
+        .num_resources  = 1,
+};
+
+static int ts78xx_ts_nand_load(void)
+{
+        int rc;
+
+        if (ts78xx_fpga.supports.ts_nand.init == 0) {
+                rc = platform_device_register(&ts78xx_ts_nand_device);
+                if (!rc)
+                        ts78xx_fpga.supports.ts_nand.init = 1;
+        } else
+                rc = platform_device_add(&ts78xx_ts_nand_device);
+
+        return rc;
+};
+
+static void ts78xx_ts_nand_unload(void)
+{
+        platform_device_del(&ts78xx_ts_nand_device);
+}
+
+/*****************************************************************************
  * FPGA 'hotplug' support code
  ****************************************************************************/
 static void ts78xx_fpga_devices_zero_init(void)
 {
         ts78xx_fpga.supports.ts_rtc.init = 0;
+        ts78xx_fpga.supports.ts_nand.init = 0;
 }
 
 static void ts78xx_fpga_supports(void)
@@ -164,9 +284,11 @@ static void ts78xx_fpga_supports(void)
         switch (ts78xx_fpga.id) {
         case TS7800_REV_B:
                 ts78xx_fpga.supports.ts_rtc.present = 1;
+                ts78xx_fpga.supports.ts_nand.present = 1;
                 break;
         default:
                 ts78xx_fpga.supports.ts_rtc.present = 0;
+                ts78xx_fpga.supports.ts_nand.present = 0;
         }
 }
 
@@ -182,6 +304,14 @@ static int ts78xx_fpga_load_devices(void)
                 }
                 ret |= tmp;
         }
+        if (ts78xx_fpga.supports.ts_nand.present == 1) {
+                tmp = ts78xx_ts_nand_load();
+                if (tmp) {
+                        printk(KERN_INFO "TS-78xx: NAND not registered\n");
+                        ts78xx_fpga.supports.ts_nand.present = 0;
+                }
+                ret |= tmp;
+        }
 
         return ret;
 }
@@ -192,6 +322,8 @@ static int ts78xx_fpga_unload_devices(void)
 
         if (ts78xx_fpga.supports.ts_rtc.present == 1)
                 ts78xx_ts_rtc_unload();
+        if (ts78xx_fpga.supports.ts_nand.present == 1)
+                ts78xx_ts_nand_unload();
 
         return ret;
 }