omap3: SDP: Introducing 'board-sdp-flash.c' for flash init

This patch adds 'board-sdp-flash.c', which could be utilized
by boards similar to 3430SDP. (For ex: 2430sdp, 36030sdp).

This file does initialization for all three flash devices present
in SDP boards (NOR, NAND, OneNAND), by finding there 'cs' number
dynamically using switch setting information (S8: 1-4).
This also expects partition information from core board files (for
ex: board-3430sdp.c). Which allows to choose different default
partitions for different boards.

A new structure is created for this purpose: 'flash_partitions'
in 'mach/board-sdp.h'. This has two members:
1. struct mtd_partition *parts
2. int nr_parts

A board file is expected to fill this structure and pass it to
'sdp-flsash-init'. Partition information should be passed in
structure array of 'flash_partitions'. Partition information should
be passed in below sequence in array:
NOR
OneNAND
NAND

Signed-off-by: Vimal Singh <vimalsingh@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 272 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/board-sdp-flash.c b/arch/arm/mach-omap2/board-sdp-flash.c
new file mode 100644
index 000000000000..b1b88deec7f2
--- /dev/null
+++ b/arch/arm/mach-omap2/board-sdp-flash.c
@@ -0,0 +1,272 @@
+/*
+ * board-sdp-flash.c
+ * Modified from mach-omap2/board-3430sdp-flash.c
+ *
+ * Copyright (C) 2009 Nokia Corporation
+ * Copyright (C) 2009 Texas Instruments
+ *
+ * Vimal Singh <vimalsingh@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/mtd/physmap.h>
+#include <linux/io.h>
+
+#include <plat/gpmc.h>
+#include <plat/nand.h>
+#include <plat/onenand.h>
+#include <plat/tc.h>
+#include <mach/board-sdp.h>
+
+#define REG_FPGA_REV                    0x10
+#define REG_FPGA_DIP_SWITCH_INPUT2      0x60
+#define MAX_SUPPORTED_GPMC_CONFIG       3
+
+#define DEBUG_BASE              0x08000000 /* debug board */
+
+#define PDC_NOR         1
+#define PDC_NAND        2
+#define PDC_ONENAND     3
+#define DBG_MPDB        4
+
+/* various memory sizes */
+#define FLASH_SIZE_SDPV1        SZ_64M  /* NOR flash (64 Meg aligned) */
+#define FLASH_SIZE_SDPV2        SZ_128M /* NOR flash (256 Meg aligned) */
+
+/*
+ * SDP3430 V2 Board CS organization
+ * Different from SDP3430 V1. Now 4 switches used to specify CS
+ *
+ * See also the Switch S8 settings in the comments.
+ *
+ * REVISIT: Add support for 2430 SDP
+ */
+static const unsigned char chip_sel_sdp[][GPMC_CS_NUM] = {
+        {PDC_NOR, PDC_NAND, PDC_ONENAND, DBG_MPDB, 0, 0, 0, 0}, /* S8:1111 */
+        {PDC_ONENAND, PDC_NAND, PDC_NOR, DBG_MPDB, 0, 0, 0, 0}, /* S8:1110 */
+        {PDC_NAND, PDC_ONENAND, PDC_NOR, DBG_MPDB, 0, 0, 0, 0}, /* S8:1101 */
+};
+
+static struct physmap_flash_data sdp_nor_data = {
+        .width          = 2,
+};
+
+static struct resource sdp_nor_resource = {
+        .flags          = IORESOURCE_MEM,
+};
+
+static struct platform_device sdp_nor_device = {
+        .name           = "physmap-flash",
+        .id             = 0,
+        .dev            = {
+                        .platform_data = &sdp_nor_data,
+        },
+        .num_resources  = 1,
+        .resource       = &sdp_nor_resource,
+};
+
+static void
+__init board_nor_init(struct flash_partitions sdp_nor_parts, u8 cs)
+{
+        int err;
+
+        sdp_nor_data.parts      = sdp_nor_parts.parts;
+        sdp_nor_data.nr_parts   = sdp_nor_parts.nr_parts;
+
+        /* Configure start address and size of NOR device */
+        if (omap_rev() >= OMAP3430_REV_ES1_0) {
+                err = gpmc_cs_request(cs, FLASH_SIZE_SDPV2 - 1,
+                                (unsigned long *)&sdp_nor_resource.start);
+                sdp_nor_resource.end = sdp_nor_resource.start
+                                        + FLASH_SIZE_SDPV2 - 1;
+        } else {
+                err = gpmc_cs_request(cs, FLASH_SIZE_SDPV1 - 1,
+                                (unsigned long *)&sdp_nor_resource.start);
+                sdp_nor_resource.end = sdp_nor_resource.start
+                                        + FLASH_SIZE_SDPV1 - 1;
+        }
+        if (err < 0) {
+                printk(KERN_ERR "NOR: Can't request GPMC CS\n");
+                return;
+        }
+        if (platform_device_register(&sdp_nor_device) < 0)
+                printk(KERN_ERR "Unable to register NOR device\n");
+}
+
+#if defined(CONFIG_MTD_ONENAND_OMAP2) || \
+                defined(CONFIG_MTD_ONENAND_OMAP2_MODULE)
+static struct omap_onenand_platform_data board_onenand_data = {
+        .dma_channel    = -1,   /* disable DMA in OMAP OneNAND driver */
+};
+
+static void
+__init board_onenand_init(struct flash_partitions sdp_onenand_parts, u8 cs)
+{
+        board_onenand_data.cs           = cs;
+        board_onenand_data.parts        = sdp_onenand_parts.parts;
+        board_onenand_data.nr_parts     = sdp_onenand_parts.nr_parts;
+
+        gpmc_onenand_init(&board_onenand_data);
+}
+#else
+static void
+__init board_onenand_init(struct flash_partitions sdp_onenand_parts, u8 cs)
+{
+}
+#endif /* CONFIG_MTD_ONENAND_OMAP2 || CONFIG_MTD_ONENAND_OMAP2_MODULE */
+
+#if defined(CONFIG_MTD_NAND_OMAP2) || \
+                defined(CONFIG_MTD_NAND_OMAP2_MODULE)
+
+/* Note that all values in this struct are in nanoseconds */
+static struct gpmc_timings nand_timings = {
+
+        .sync_clk = 0,
+
+        .cs_on = 0,
+        .cs_rd_off = 36,
+        .cs_wr_off = 36,
+
+        .adv_on = 6,
+        .adv_rd_off = 24,
+        .adv_wr_off = 36,
+
+        .we_off = 30,
+        .oe_off = 48,
+
+        .access = 54,
+        .rd_cycle = 72,
+        .wr_cycle = 72,
+
+        .wr_access = 30,
+        .wr_data_mux_bus = 0,
+};
+
+static struct omap_nand_platform_data sdp_nand_data = {
+        .nand_setup     = NULL,
+        .gpmc_t         = &nand_timings,
+        .dma_channel    = -1,           /* disable DMA in OMAP NAND driver */
+        .dev_ready      = NULL,
+        .devsize        = 0,    /* '0' for 8-bit, '1' for 16-bit device */
+};
+
+static void
+__init board_nand_init(struct flash_partitions sdp_nand_parts, u8 cs)
+{
+        sdp_nand_data.cs                = cs;
+        sdp_nand_data.parts             = sdp_nand_parts.parts;
+        sdp_nand_data.nr_parts          = sdp_nand_parts.nr_parts;
+
+        sdp_nand_data.gpmc_cs_baseaddr  = (void *)(OMAP34XX_GPMC_VIRT +
+                                                        GPMC_CS0_BASE +
+                                                        cs * GPMC_CS_SIZE);
+        sdp_nand_data.gpmc_baseaddr      = (void *) (OMAP34XX_GPMC_VIRT);
+
+        gpmc_nand_init(&sdp_nand_data);
+}
+#else
+static void
+__init board_nand_init(struct flash_partitions sdp_nand_parts, u8 cs)
+{
+}
+#endif /* CONFIG_MTD_NAND_OMAP2 || CONFIG_MTD_NAND_OMAP2_MODULE */
+
+/**
+ * get_gpmc0_type - Reads the FPGA DIP_SWITCH_INPUT_REGISTER2 to get
+ * the various cs values.
+ */
+static u8 get_gpmc0_type(void)
+{
+        u8 cs = 0;
+        void __iomem *fpga_map_addr;
+
+        fpga_map_addr = ioremap(DEBUG_BASE, 4096);
+        if (!fpga_map_addr)
+                return -ENOMEM;
+
+        if (!(__raw_readw(fpga_map_addr + REG_FPGA_REV)))
+                /* we dont have an DEBUG FPGA??? */
+                /* Depend on #defines!! default to strata boot return param */
+                goto unmap;
+
+        /* S8-DIP-OFF = 1, S8-DIP-ON = 0 */
+        cs = __raw_readw(fpga_map_addr + REG_FPGA_DIP_SWITCH_INPUT2) & 0xf;
+
+        /* ES2.0 SDP's onwards 4 dip switches are provided for CS */
+        if (omap_rev() >= OMAP3430_REV_ES1_0)
+                /* change (S8-1:4=DS-2:0) to (S8-4:1=DS-2:0) */
+                cs = ((cs & 8) >> 3) | ((cs & 4) >> 1) |
+                        ((cs & 2) << 1) | ((cs & 1) << 3);
+        else
+                /* change (S8-1:3=DS-2:0) to (S8-3:1=DS-2:0) */
+                cs = ((cs & 4) >> 2) | (cs & 2) | ((cs & 1) << 2);
+unmap:
+        iounmap(fpga_map_addr);
+        return cs;
+}
+
+/**
+ * sdp3430_flash_init - Identify devices connected to GPMC and register.
+ *
+ * @return - void.
+ */
+void __init sdp_flash_init(struct flash_partitions sdp_partition_info[])
+{
+        u8              cs = 0;
+        u8              norcs = GPMC_CS_NUM + 1;
+        u8              nandcs = GPMC_CS_NUM + 1;
+        u8              onenandcs = GPMC_CS_NUM + 1;
+        u8              idx;
+        unsigned char   *config_sel = NULL;
+
+        /* REVISIT: Is this return correct idx for 2430 SDP?
+         * for which cs configuration matches for 2430 SDP?
+         */
+        idx = get_gpmc0_type();
+        if (idx >= MAX_SUPPORTED_GPMC_CONFIG) {
+                printk(KERN_ERR "%s: Invalid chip select: %d\n", __func__, cs);
+                return;
+        }
+        config_sel = (unsigned char *)(chip_sel_sdp[idx]);
+
+        while (cs < GPMC_CS_NUM) {
+                switch (config_sel[cs]) {
+                case PDC_NOR:
+                        if (norcs > GPMC_CS_NUM)
+                                norcs = cs;
+                        break;
+                case PDC_NAND:
+                        if (nandcs > GPMC_CS_NUM)
+                                nandcs = cs;
+                        break;
+                case PDC_ONENAND:
+                        if (onenandcs > GPMC_CS_NUM)
+                                onenandcs = cs;
+                        break;
+                };
+                cs++;
+        }
+
+        if (norcs > GPMC_CS_NUM)
+                printk(KERN_INFO "OneNAND: Unable to find configuration "
+                                " in GPMC\n ");
+        else
+                board_nor_init(sdp_partition_info[0], norcs);
+
+        if (onenandcs > GPMC_CS_NUM)
+                printk(KERN_INFO "OneNAND: Unable to find configuration "
+                                " in GPMC\n ");
+        else
+                board_onenand_init(sdp_partition_info[1], onenandcs);
+
+        if (nandcs > GPMC_CS_NUM)
+                printk(KERN_INFO "NAND: Unable to find configuration "
+                                " in GPMC\n ");
+        else
+                board_nand_init(sdp_partition_info[2], nandcs);
+}