MIPS: Netlogic: Platform NAND/NOR flash support

Changes to add support for the boot NOR flash on XLR boards and the
boot NAND/NOR flash drivers on the XLS boards.

Signed-off-by: Ganesan Ramalingam <ganesanr@netlogicmicro.com>
Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3758/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 221 insertions, 1 deletions

diff --git a/arch/mips/netlogic/xlr/Makefile b/arch/mips/netlogic/xlr/Makefile
index f01e4d7a0600..c287dea87570 100644
--- a/arch/mips/netlogic/xlr/Makefile
+++ b/arch/mips/netlogic/xlr/Makefile
@@ -1,2 +1,2 @@
-obj-y                           += setup.o platform.o
+obj-y                           += setup.o platform.o platform-flash.o
 obj-$(CONFIG_SMP)               += wakeup.o
diff --git a/arch/mips/netlogic/xlr/platform-flash.c b/arch/mips/netlogic/xlr/platform-flash.c
new file mode 100644
index 000000000000..340ab1601c42
--- /dev/null
+++ b/arch/mips/netlogic/xlr/platform-flash.c
@@ -0,0 +1,220 @@
+/*
+ * Copyright 2011, Netlogic Microsystems.
+ * Copyright 2004, Matt Porter <mporter@kernel.crashing.org>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/resource.h>
+#include <linux/spi/flash.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/physmap.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/netlogic/haldefs.h>
+#include <asm/netlogic/xlr/iomap.h>
+#include <asm/netlogic/xlr/flash.h>
+#include <asm/netlogic/xlr/bridge.h>
+#include <asm/netlogic/xlr/gpio.h>
+#include <asm/netlogic/xlr/xlr.h>
+
+/*
+ * Default NOR partition layout
+ */
+static struct mtd_partition xlr_nor_parts[] = {
+        {
+                .name = "User FS",
+                .offset = 0x800000,
+                .size   = MTDPART_SIZ_FULL,
+        }
+};
+
+/*
+ * Default NAND partition layout
+ */
+static struct mtd_partition xlr_nand_parts[] = {
+        {
+                .name   = "Root Filesystem",
+                .offset = 64 * 64 * 2048,
+                .size   = 432 * 64 * 2048,
+        },
+        {
+                .name   = "Home Filesystem",
+                .offset = MTDPART_OFS_APPEND,
+                .size   = MTDPART_SIZ_FULL,
+        },
+};
+
+/* Use PHYSMAP flash for NOR */
+struct physmap_flash_data xlr_nor_data = {
+        .width          = 2,
+        .parts          = xlr_nor_parts,
+        .nr_parts       = ARRAY_SIZE(xlr_nor_parts),
+};
+
+static struct resource xlr_nor_res[] = {
+        {
+                .flags  = IORESOURCE_MEM,
+        },
+};
+
+static struct platform_device xlr_nor_dev = {
+        .name   = "physmap-flash",
+        .dev    = {
+                .platform_data  = &xlr_nor_data,
+        },
+        .num_resources  = ARRAY_SIZE(xlr_nor_res),
+        .resource       = xlr_nor_res,
+};
+
+const char *xlr_part_probes[] = { "cmdlinepart", NULL };
+
+/*
+ * Use "gen_nand" driver for NAND flash
+ *
+ * There seems to be no way to store a private pointer containing
+ * platform specific info in gen_nand drivier. We will use a global
+ * struct for now, since we currently have only one NAND chip per board.
+ */
+struct xlr_nand_flash_priv {
+        int cs;
+        uint64_t flash_mmio;
+};
+
+static struct xlr_nand_flash_priv nand_priv;
+
+static void xlr_nand_ctrl(struct mtd_info *mtd, int cmd,
+                unsigned int ctrl)
+{
+        if (ctrl & NAND_CLE)
+                nlm_write_reg(nand_priv.flash_mmio,
+                        FLASH_NAND_CLE(nand_priv.cs), cmd);
+        else if (ctrl & NAND_ALE)
+                nlm_write_reg(nand_priv.flash_mmio,
+                        FLASH_NAND_ALE(nand_priv.cs), cmd);
+}
+
+struct platform_nand_data xlr_nand_data = {
+        .chip = {
+                .nr_chips       = 1,
+                .nr_partitions  = ARRAY_SIZE(xlr_nand_parts),
+                .chip_delay     = 50,
+                .partitions     = xlr_nand_parts,
+                .part_probe_types = xlr_part_probes,
+        },
+        .ctrl = {
+                .cmd_ctrl       = xlr_nand_ctrl,
+        },
+};
+
+static struct resource xlr_nand_res[] = {
+        {
+                .flags          = IORESOURCE_MEM,
+        },
+};
+
+static struct platform_device xlr_nand_dev = {
+        .name           = "gen_nand",
+        .id             = -1,
+        .num_resources  = ARRAY_SIZE(xlr_nand_res),
+        .resource       = xlr_nand_res,
+        .dev            = {
+                .platform_data  = &xlr_nand_data,
+        }
+};
+
+/*
+ * XLR/XLS supports upto 8 devices on its FLASH interface. The value in
+ * FLASH_BAR (on the MEM/IO bridge) gives the base for mapping all the
+ * flash devices.
+ * Under this, each flash device has an offset and size given by the
+ * CSBASE_ADDR and CSBASE_MASK registers for the device.
+ *
+ * The CSBASE_ registers are expected to be setup by the bootloader.
+ */
+static void setup_flash_resource(uint64_t flash_mmio,
+        uint64_t flash_map_base, int cs, struct resource *res)
+{
+        u32 base, mask;
+
+        base = nlm_read_reg(flash_mmio, FLASH_CSBASE_ADDR(cs));
+        mask = nlm_read_reg(flash_mmio, FLASH_CSADDR_MASK(cs));
+
+        res->start = flash_map_base + ((unsigned long)base << 16);
+        res->end = res->start + (mask + 1) * 64 * 1024;
+}
+
+static int __init xlr_flash_init(void)
+{
+        uint64_t gpio_mmio, flash_mmio, flash_map_base;
+        u32 gpio_resetcfg, flash_bar;
+        int cs, boot_nand, boot_nor;
+
+        /* Flash address bits 39:24 is in bridge flash BAR */
+        flash_bar = nlm_read_reg(nlm_io_base, BRIDGE_FLASH_BAR);
+        flash_map_base = (flash_bar & 0xffff0000) << 8;
+
+        gpio_mmio = nlm_mmio_base(NETLOGIC_IO_GPIO_OFFSET);
+        flash_mmio = nlm_mmio_base(NETLOGIC_IO_FLASH_OFFSET);
+
+        /* Get the chip reset config */
+        gpio_resetcfg = nlm_read_reg(gpio_mmio, GPIO_PWRON_RESET_CFG_REG);
+
+        /* Check for boot flash type */
+        boot_nor = boot_nand = 0;
+        if (nlm_chip_is_xls()) {
+                /* On XLS, check boot from NAND bit (GPIO reset reg bit 16) */
+                if (gpio_resetcfg & (1 << 16))
+                        boot_nand = 1;
+
+                /* check boot from PCMCIA, (GPIO reset reg bit 15 */
+                if ((gpio_resetcfg & (1 << 15)) == 0)
+                        boot_nor = 1;   /* not set, booted from NOR */
+        } else { /* XLR */
+                /* check boot from PCMCIA (bit 16 in GPIO reset on XLR) */
+                if ((gpio_resetcfg & (1 << 16)) == 0)
+                        boot_nor = 1;   /* not set, booted from NOR */
+        }
+
+        /* boot flash at chip select 0 */
+        cs = 0;
+
+        if (boot_nand) {
+                nand_priv.cs = cs;
+                nand_priv.flash_mmio = flash_mmio;
+                setup_flash_resource(flash_mmio, flash_map_base, cs,
+                         xlr_nand_res);
+
+                /* Initialize NAND flash at CS 0 */
+                nlm_write_reg(flash_mmio, FLASH_CSDEV_PARM(cs),
+                                FLASH_NAND_CSDEV_PARAM);
+                nlm_write_reg(flash_mmio, FLASH_CSTIME_PARMA(cs),
+                                FLASH_NAND_CSTIME_PARAMA);
+                nlm_write_reg(flash_mmio, FLASH_CSTIME_PARMB(cs),
+                                FLASH_NAND_CSTIME_PARAMB);
+
+                pr_info("ChipSelect %d: NAND Flash %pR\n", cs, xlr_nand_res);
+                return platform_device_register(&xlr_nand_dev);
+        }
+
+        if (boot_nor) {
+                setup_flash_resource(flash_mmio, flash_map_base, cs,
+                        xlr_nor_res);
+                pr_info("ChipSelect %d: NOR Flash %pR\n", cs, xlr_nor_res);
+                return platform_device_register(&xlr_nor_dev);
+        }
+        return 0;
+}
+
+arch_initcall(xlr_flash_init);