[PATCH 16/17] omap3: SDP: Introducing 'board-sdp-flash.c' for flash init

Tony Lindgren
2010-02-11T03:45:34Z

>From 6351a5d5dc656b348074d3ef67a63420c054041a Mon Sep 17 00:00:00 2001
From: Vimal Singh <vimalsingh@ti.com>
Date: Wed, 10 Feb 2010 18:22:55 -0800
Subject: [PATCH] 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>

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 0000000..b1b88de
--- /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);
+}
diff --git a/arch/arm/mach-omap2/include/mach/board-sdp.h b/arch/arm/mach-omap2/include/mach/board-sdp.h
new file mode 100644
index 0000000..465169c
--- /dev/null
+++ b/arch/arm/mach-omap2/include/mach/board-sdp.h
@@ -0,0 +1,21 @@
+/*
+ * board-sdp.h
+ *
+ * Information structures for SDP-specific board config data
+ *
+ * Copyright (C) 2009 Nokia Corporation
+ * Copyright (C) 2009 Texas Instruments
+ *
+ * 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/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+
+struct flash_partitions {
+ struct mtd_partition *parts;
+ int nr_parts;
+};
+
+extern void sdp_flash_init(struct flash_partitions []);
diff --git a/arch/arm/plat-omap/include/plat/gpmc.h b/arch/arm/plat-omap/include/plat/gpmc.h
index 3f3609a..145838a 100644
--- a/arch/arm/plat-omap/include/plat/gpmc.h
+++ b/arch/arm/plat-omap/include/plat/gpmc.h
@@ -27,6 +27,8 @@

#define GPMC_CONFIG 0x50
#define GPMC_STATUS 0x54
+#define GPMC_CS0_BASE 0x60
+#define GPMC_CS_SIZE 0x30

#define GPMC_CONFIG1_WRAPBURST_SUPP (1 << 31)
#define GPMC_CONFIG1_READMULTIPLE_SUPP (1 << 30)