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-rw-r--r--arch/arm/cpu/arm926ejs/davinci/reset.c2
-rw-r--r--arch/arm/cpu/armv7/am33xx/Makefile2
-rw-r--r--arch/arm/cpu/armv7/am33xx/board.c1
-rw-r--r--arch/arm/cpu/armv7/am33xx/clock.c10
-rw-r--r--arch/arm/cpu/armv7/am33xx/elm.c212
-rw-r--r--arch/arm/cpu/armv7/am33xx/mem.c101
-rw-r--r--arch/arm/cpu/armv7/omap-common/Makefile5
-rw-r--r--arch/arm/cpu/armv7/omap-common/boot-common.c1
-rw-r--r--arch/arm/cpu/armv7/omap-common/emif-common.c41
-rw-r--r--arch/arm/cpu/armv7/omap3/board.c4
-rw-r--r--arch/arm/cpu/armv7/omap3/mem.c18
-rw-r--r--arch/arm/cpu/armv7/omap3/sdrc.c36
-rw-r--r--arch/arm/cpu/armv7/omap4/clocks.c2
-rw-r--r--arch/arm/cpu/armv7/omap4/hwinit.c4
-rw-r--r--arch/arm/include/asm/arch-am33xx/cpu.h53
-rw-r--r--arch/arm/include/asm/arch-am33xx/elm.h93
-rw-r--r--arch/arm/include/asm/arch-am33xx/hardware.h3
-rw-r--r--arch/arm/include/asm/arch-am33xx/mem.h83
-rw-r--r--arch/arm/include/asm/arch-am33xx/omap_gpmc.h120
-rw-r--r--arch/arm/include/asm/arch-am33xx/sys_proto.h3
-rw-r--r--arch/arm/include/asm/arch-omap3/sys_proto.h13
-rw-r--r--arch/arm/include/asm/omap_gpio.h7
22 files changed, 762 insertions, 52 deletions
diff --git a/arch/arm/cpu/arm926ejs/davinci/reset.c b/arch/arm/cpu/arm926ejs/davinci/reset.c
index 968fb03..80f1ce9 100644
--- a/arch/arm/cpu/arm926ejs/davinci/reset.c
+++ b/arch/arm/cpu/arm926ejs/davinci/reset.c
@@ -16,7 +16,7 @@
void reset_cpu(unsigned long a)
{
struct davinci_timer *const wdttimer =
- (struct davinci_timer *)DAVINCI_TIMER1_BASE;
+ (struct davinci_timer *)DAVINCI_WDOG_BASE;
writel(0x08, &wdttimer->tgcr);
writel(readl(&wdttimer->tgcr) | 0x03, &wdttimer->tgcr);
writel(0, &wdttimer->tim12);
diff --git a/arch/arm/cpu/armv7/am33xx/Makefile b/arch/arm/cpu/armv7/am33xx/Makefile
index 74875b3..70c443e 100644
--- a/arch/arm/cpu/armv7/am33xx/Makefile
+++ b/arch/arm/cpu/armv7/am33xx/Makefile
@@ -18,10 +18,12 @@ LIB = $(obj)lib$(SOC).o
COBJS += clock.o
COBJS += sys_info.o
+COBJS += mem.o
COBJS += ddr.o
COBJS += emif4.o
COBJS += board.o
COBJS += mux.o
+COBJS-$(CONFIG_NAND_OMAP_GPMC) += elm.o
SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(COBJS) $(COBJS-y) $(SOBJS))
diff --git a/arch/arm/cpu/armv7/am33xx/board.c b/arch/arm/cpu/armv7/am33xx/board.c
index da5bc73..ab31326 100644
--- a/arch/arm/cpu/armv7/am33xx/board.c
+++ b/arch/arm/cpu/armv7/am33xx/board.c
@@ -25,6 +25,7 @@
#include <asm/arch/ddr_defs.h>
#include <asm/arch/clock.h>
#include <asm/arch/gpio.h>
+#include <asm/arch/mem.h>
#include <asm/arch/mmc_host_def.h>
#include <asm/arch/sys_proto.h>
#include <asm/io.h>
diff --git a/arch/arm/cpu/armv7/am33xx/clock.c b/arch/arm/cpu/armv7/am33xx/clock.c
index 0b4cb4e..d7d98d1 100644
--- a/arch/arm/cpu/armv7/am33xx/clock.c
+++ b/arch/arm/cpu/armv7/am33xx/clock.c
@@ -151,6 +151,16 @@ static void enable_per_clocks(void)
;
#endif /* CONFIG_SERIAL6 */
+ /* GPMC */
+ writel(PRCM_MOD_EN, &cmper->gpmcclkctrl);
+ while (readl(&cmper->gpmcclkctrl) != PRCM_MOD_EN)
+ ;
+
+ /* ELM */
+ writel(PRCM_MOD_EN, &cmper->elmclkctrl);
+ while (readl(&cmper->elmclkctrl) != PRCM_MOD_EN)
+ ;
+
/* MMC0*/
writel(PRCM_MOD_EN, &cmper->mmc0clkctrl);
while (readl(&cmper->mmc0clkctrl) != PRCM_MOD_EN)
diff --git a/arch/arm/cpu/armv7/am33xx/elm.c b/arch/arm/cpu/armv7/am33xx/elm.c
new file mode 100644
index 0000000..9eed23d
--- /dev/null
+++ b/arch/arm/cpu/armv7/am33xx/elm.c
@@ -0,0 +1,212 @@
+/*
+ * (C) Copyright 2010-2011 Texas Instruments, <www.ti.com>
+ * Mansoor Ahamed <mansoor.ahamed@ti.com>
+ *
+ * BCH Error Location Module (ELM) support.
+ *
+ * NOTE:
+ * 1. Supports only continuous mode. Dont see need for page mode in uboot
+ * 2. Supports only syndrome polynomial 0. i.e. poly local variable is
+ * always set to ELM_DEFAULT_POLY. Dont see need for other polynomial
+ * sets in uboot
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/omap_gpmc.h>
+#include <asm/arch/elm.h>
+
+#define ELM_DEFAULT_POLY (0)
+
+struct elm *elm_cfg;
+
+/**
+ * elm_load_syndromes - Load BCH syndromes based on nibble selection
+ * @syndrome: BCH syndrome
+ * @nibbles:
+ * @poly: Syndrome Polynomial set to use
+ *
+ * Load BCH syndromes based on nibble selection
+ */
+static void elm_load_syndromes(u8 *syndrome, u32 nibbles, u8 poly)
+{
+ u32 *ptr;
+ u32 val;
+
+ /* reg 0 */
+ ptr = &elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[0];
+ val = syndrome[0] | (syndrome[1] << 8) | (syndrome[2] << 16) |
+ (syndrome[3] << 24);
+ writel(val, ptr);
+ /* reg 1 */
+ ptr = &elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[1];
+ val = syndrome[4] | (syndrome[5] << 8) | (syndrome[6] << 16) |
+ (syndrome[7] << 24);
+ writel(val, ptr);
+
+ /* BCH 8-bit with 26 nibbles (4*8=32) */
+ if (nibbles > 13) {
+ /* reg 2 */
+ ptr = &elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[2];
+ val = syndrome[8] | (syndrome[9] << 8) | (syndrome[10] << 16) |
+ (syndrome[11] << 24);
+ writel(val, ptr);
+ /* reg 3 */
+ ptr = &elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[3];
+ val = syndrome[12] | (syndrome[13] << 8) |
+ (syndrome[14] << 16) | (syndrome[15] << 24);
+ writel(val, ptr);
+ }
+
+ /* BCH 16-bit with 52 nibbles (7*8=56) */
+ if (nibbles > 26) {
+ /* reg 4 */
+ ptr = &elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[4];
+ val = syndrome[16] | (syndrome[17] << 8) |
+ (syndrome[18] << 16) | (syndrome[19] << 24);
+ writel(val, ptr);
+
+ /* reg 5 */
+ ptr = &elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[5];
+ val = syndrome[20] | (syndrome[21] << 8) |
+ (syndrome[22] << 16) | (syndrome[23] << 24);
+ writel(val, ptr);
+
+ /* reg 6 */
+ ptr = &elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[6];
+ val = syndrome[24] | (syndrome[25] << 8) |
+ (syndrome[26] << 16) | (syndrome[27] << 24);
+ writel(val, ptr);
+ }
+}
+
+/**
+ * elm_check_errors - Check for BCH errors and return error locations
+ * @syndrome: BCH syndrome
+ * @nibbles:
+ * @error_count: Returns number of errrors in the syndrome
+ * @error_locations: Returns error locations (in decimal) in this array
+ *
+ * Check the provided syndrome for BCH errors and return error count
+ * and locations in the array passed. Returns -1 if error is not correctable,
+ * else returns 0
+ */
+int elm_check_error(u8 *syndrome, u32 nibbles, u32 *error_count,
+ u32 *error_locations)
+{
+ u8 poly = ELM_DEFAULT_POLY;
+ s8 i;
+ u32 location_status;
+
+ elm_load_syndromes(syndrome, nibbles, poly);
+
+ /* start processing */
+ writel((readl(&elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[6])
+ | ELM_SYNDROME_FRAGMENT_6_SYNDROME_VALID),
+ &elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[6]);
+
+ /* wait for processing to complete */
+ while ((readl(&elm_cfg->irqstatus) & (0x1 << poly)) != 0x1)
+ ;
+ /* clear status */
+ writel((readl(&elm_cfg->irqstatus) | (0x1 << poly)),
+ &elm_cfg->irqstatus);
+
+ /* check if correctable */
+ location_status = readl(&elm_cfg->error_location[poly].location_status);
+ if (!(location_status & ELM_LOCATION_STATUS_ECC_CORRECTABLE_MASK))
+ return -1;
+
+ /* get error count */
+ *error_count = readl(&elm_cfg->error_location[poly].location_status) &
+ ELM_LOCATION_STATUS_ECC_NB_ERRORS_MASK;
+
+ for (i = 0; i < *error_count; i++) {
+ error_locations[i] =
+ readl(&elm_cfg->error_location[poly].error_location_x[i]);
+ }
+
+ return 0;
+}
+
+
+/**
+ * elm_config - Configure ELM module
+ * @level: 4 / 8 / 16 bit BCH
+ *
+ * Configure ELM module based on BCH level.
+ * Set mode as continuous mode.
+ * Currently we are using only syndrome 0 and syndromes 1 to 6 are not used.
+ * Also, the mode is set only for syndrome 0
+ */
+int elm_config(enum bch_level level)
+{
+ u32 val;
+ u8 poly = ELM_DEFAULT_POLY;
+ u32 buffer_size = 0x7FF;
+
+ /* config size and level */
+ val = (u32)(level) & ELM_LOCATION_CONFIG_ECC_BCH_LEVEL_MASK;
+ val |= ((buffer_size << ELM_LOCATION_CONFIG_ECC_SIZE_POS) &
+ ELM_LOCATION_CONFIG_ECC_SIZE_MASK);
+ writel(val, &elm_cfg->location_config);
+
+ /* config continous mode */
+ /* enable interrupt generation for syndrome polynomial set */
+ writel((readl(&elm_cfg->irqenable) | (0x1 << poly)),
+ &elm_cfg->irqenable);
+ /* set continuous mode for the syndrome polynomial set */
+ writel((readl(&elm_cfg->page_ctrl) & ~(0x1 << poly)),
+ &elm_cfg->page_ctrl);
+
+ return 0;
+}
+
+/**
+ * elm_reset - Do a soft reset of ELM
+ *
+ * Perform a soft reset of ELM and return after reset is done.
+ */
+void elm_reset(void)
+{
+ /* initiate reset */
+ writel((readl(&elm_cfg->sysconfig) | ELM_SYSCONFIG_SOFTRESET),
+ &elm_cfg->sysconfig);
+
+ /* wait for reset complete and normal operation */
+ while ((readl(&elm_cfg->sysstatus) & ELM_SYSSTATUS_RESETDONE) !=
+ ELM_SYSSTATUS_RESETDONE)
+ ;
+}
+
+/**
+ * elm_init - Initialize ELM module
+ *
+ * Initialize ELM support. Currently it does only base address init
+ * and ELM reset.
+ */
+void elm_init(void)
+{
+ elm_cfg = (struct elm *)ELM_BASE;
+ elm_reset();
+}
diff --git a/arch/arm/cpu/armv7/am33xx/mem.c b/arch/arm/cpu/armv7/am33xx/mem.c
new file mode 100644
index 0000000..b8f54ab
--- /dev/null
+++ b/arch/arm/cpu/armv7/am33xx/mem.c
@@ -0,0 +1,101 @@
+/*
+ * (C) Copyright 2010
+ * Texas Instruments, <www.ti.com>
+ *
+ * Author :
+ * Mansoor Ahamed <mansoor.ahamed@ti.com>
+ *
+ * Initial Code from:
+ * Manikandan Pillai <mani.pillai@ti.com>
+ * Richard Woodruff <r-woodruff2@ti.com>
+ * Syed Mohammed Khasim <khasim@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/mem.h>
+#include <asm/arch/sys_proto.h>
+#include <command.h>
+
+struct gpmc *gpmc_cfg;
+
+#if defined(CONFIG_CMD_NAND)
+static const u32 gpmc_m_nand[GPMC_MAX_REG] = {
+ M_NAND_GPMC_CONFIG1,
+ M_NAND_GPMC_CONFIG2,
+ M_NAND_GPMC_CONFIG3,
+ M_NAND_GPMC_CONFIG4,
+ M_NAND_GPMC_CONFIG5,
+ M_NAND_GPMC_CONFIG6, 0
+};
+#endif
+
+
+void enable_gpmc_cs_config(const u32 *gpmc_config, struct gpmc_cs *cs, u32 base,
+ u32 size)
+{
+ writel(0, &cs->config7);
+ sdelay(1000);
+ /* Delay for settling */
+ writel(gpmc_config[0], &cs->config1);
+ writel(gpmc_config[1], &cs->config2);
+ writel(gpmc_config[2], &cs->config3);
+ writel(gpmc_config[3], &cs->config4);
+ writel(gpmc_config[4], &cs->config5);
+ writel(gpmc_config[5], &cs->config6);
+ /* Enable the config */
+ writel((((size & 0xF) << 8) | ((base >> 24) & 0x3F) |
+ (1 << 6)), &cs->config7);
+ sdelay(2000);
+}
+
+/*****************************************************
+ * gpmc_init(): init gpmc bus
+ * Init GPMC for x16, MuxMode (SDRAM in x32).
+ * This code can only be executed from SRAM or SDRAM.
+ *****************************************************/
+void gpmc_init(void)
+{
+ /* putting a blanket check on GPMC based on ZeBu for now */
+ gpmc_cfg = (struct gpmc *)GPMC_BASE;
+
+#ifdef CONFIG_CMD_NAND
+ const u32 *gpmc_config = NULL;
+ u32 base = 0;
+ u32 size = 0;
+#endif
+ /* global settings */
+ writel(0x00000008, &gpmc_cfg->sysconfig);
+ writel(0x00000100, &gpmc_cfg->irqstatus);
+ writel(0x00000200, &gpmc_cfg->irqenable);
+ writel(0x00000012, &gpmc_cfg->config);
+ /*
+ * Disable the GPMC0 config set by ROM code
+ */
+ writel(0, &gpmc_cfg->cs[0].config7);
+ sdelay(1000);
+
+#ifdef CONFIG_CMD_NAND
+ gpmc_config = gpmc_m_nand;
+
+ base = PISMO1_NAND_BASE;
+ size = PISMO1_NAND_SIZE;
+ enable_gpmc_cs_config(gpmc_config, &gpmc_cfg->cs[0], base, size);
+#endif
+}
diff --git a/arch/arm/cpu/armv7/omap-common/Makefile b/arch/arm/cpu/armv7/omap-common/Makefile
index 1f2fa02..0efc80d 100644
--- a/arch/arm/cpu/armv7/omap-common/Makefile
+++ b/arch/arm/cpu/armv7/omap-common/Makefile
@@ -25,9 +25,8 @@ include $(TOPDIR)/config.mk
LIB = $(obj)libomap-common.o
-SOBJS := reset.o
-
-COBJS := timer.o
+COBJS := reset.o
+COBJS += timer.o
COBJS += utils.o
ifneq ($(CONFIG_OMAP44XX)$(CONFIG_OMAP54XX),)
diff --git a/arch/arm/cpu/armv7/omap-common/boot-common.c b/arch/arm/cpu/armv7/omap-common/boot-common.c
index 0f19141..2b584e0 100644
--- a/arch/arm/cpu/armv7/omap-common/boot-common.c
+++ b/arch/arm/cpu/armv7/omap-common/boot-common.c
@@ -21,6 +21,7 @@
#include <asm/omap_common.h>
#include <asm/arch/omap.h>
#include <asm/arch/mmc_host_def.h>
+#include <asm/arch/sys_proto.h>
/*
* This is used to verify if the configuration header
diff --git a/arch/arm/cpu/armv7/omap-common/emif-common.c b/arch/arm/cpu/armv7/omap-common/emif-common.c
index 30dcf1b..88253cf 100644
--- a/arch/arm/cpu/armv7/omap-common/emif-common.c
+++ b/arch/arm/cpu/armv7/omap-common/emif-common.c
@@ -33,6 +33,8 @@
#include <asm/utils.h>
#include <linux/compiler.h>
+static int emif1_enabled = -1, emif2_enabled = -1;
+
void set_lpmode_selfrefresh(u32 base)
{
struct emif_reg_struct *emif = (struct emif_reg_struct *)base;
@@ -1109,6 +1111,7 @@ void emif_post_init_config(u32 base)
void dmm_init(u32 base)
{
const struct dmm_lisa_map_regs *lisa_map_regs;
+ u32 i, section, valid;
#ifdef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS
emif_get_dmm_regs(&lisa_map_regs);
@@ -1216,6 +1219,29 @@ void dmm_init(u32 base)
writel(lisa_map_regs->dmm_lisa_map_0,
&hw_lisa_map_regs->dmm_lisa_map_0);
}
+
+ /*
+ * EMIF should be configured only when
+ * memory is mapped on it. Using emif1_enabled
+ * and emif2_enabled variables for this.
+ */
+ emif1_enabled = 0;
+ emif2_enabled = 0;
+ for (i = 0; i < 4; i++) {
+ section = __raw_readl(DMM_BASE + i*4);
+ valid = (section & EMIF_SDRC_MAP_MASK) >>
+ (EMIF_SDRC_MAP_SHIFT);
+ if (valid == 3) {
+ emif1_enabled = 1;
+ emif2_enabled = 1;
+ break;
+ } else if (valid == 1) {
+ emif1_enabled = 1;
+ } else if (valid == 2) {
+ emif2_enabled = 1;
+ }
+ }
+
}
/*
@@ -1255,15 +1281,20 @@ void sdram_init(void)
writel(CM_DLL_CTRL_NO_OVERRIDE, &prcm->cm_dll_ctrl);
}
- do_sdram_init(EMIF1_BASE);
- do_sdram_init(EMIF2_BASE);
-
if (!in_sdram)
dmm_init(DMM_BASE);
+ if (emif1_enabled)
+ do_sdram_init(EMIF1_BASE);
+
+ if (emif2_enabled)
+ do_sdram_init(EMIF2_BASE);
+
if (!(in_sdram || warm_reset())) {
- emif_post_init_config(EMIF1_BASE);
- emif_post_init_config(EMIF2_BASE);
+ if (emif1_enabled)
+ emif_post_init_config(EMIF1_BASE);
+ if (emif2_enabled)
+ emif_post_init_config(EMIF2_BASE);
}
/* for the shadow registers to take effect */
diff --git a/arch/arm/cpu/armv7/omap3/board.c b/arch/arm/cpu/armv7/omap3/board.c
index f3cd81a..89c587e 100644
--- a/arch/arm/cpu/armv7/omap3/board.c
+++ b/arch/arm/cpu/armv7/omap3/board.c
@@ -478,7 +478,7 @@ void omap3_outer_cache_disable(void)
*/
omap3_update_aux_cr(0, 0x2);
}
-#endif
+#endif /* !CONFIG_SYS_L2CACHE_OFF */
#ifndef CONFIG_SYS_DCACHE_OFF
void enable_caches(void)
@@ -486,4 +486,4 @@ void enable_caches(void)
/* Enable D-cache. I-cache is already enabled in start.S */
dcache_enable();
}
-#endif
+#endif /* !CONFIG_SYS_DCACHE_OFF */
diff --git a/arch/arm/cpu/armv7/omap3/mem.c b/arch/arm/cpu/armv7/omap3/mem.c
index 2fe5ac7..d04a5a1 100644
--- a/arch/arm/cpu/armv7/omap3/mem.c
+++ b/arch/arm/cpu/armv7/omap3/mem.c
@@ -42,14 +42,7 @@ static const u32 gpmc_m_nand[GPMC_MAX_REG] = {
M_NAND_GPMC_CONFIG5,
M_NAND_GPMC_CONFIG6, 0
};
-
-#if defined(CONFIG_ENV_IS_IN_NAND)
-#define GPMC_CS 0
-#else
-#define GPMC_CS 1
-#endif
-
-#endif
+#endif /* CONFIG_CMD_NAND */
#if defined(CONFIG_CMD_ONENAND)
static const u32 gpmc_onenand[GPMC_MAX_REG] = {
@@ -60,14 +53,7 @@ static const u32 gpmc_onenand[GPMC_MAX_REG] = {
ONENAND_GPMC_CONFIG5,
ONENAND_GPMC_CONFIG6, 0
};
-
-#if defined(CONFIG_ENV_IS_IN_ONENAND)
-#define GPMC_CS 0
-#else
-#define GPMC_CS 1
-#endif
-
-#endif
+#endif /* CONFIG_CMD_ONENAND */
/********************************************************
* mem_ok() - test used to see if timings are correct
diff --git a/arch/arm/cpu/armv7/omap3/sdrc.c b/arch/arm/cpu/armv7/omap3/sdrc.c
index f6d9b97..e32bf11 100644
--- a/arch/arm/cpu/armv7/omap3/sdrc.c
+++ b/arch/arm/cpu/armv7/omap3/sdrc.c
@@ -113,18 +113,18 @@ u32 get_sdr_cs_offset(u32 cs)
* - Test CS to make sure it's OK for use
*/
static void write_sdrc_timings(u32 cs, struct sdrc_actim *sdrc_actim_base,
- u32 mcfg, u32 ctrla, u32 ctrlb, u32 rfr_ctrl, u32 mr)
+ struct board_sdrc_timings *timings)
{
/* Setup timings we got from the board. */
- writel(mcfg, &sdrc_base->cs[cs].mcfg);
- writel(ctrla, &sdrc_actim_base->ctrla);
- writel(ctrlb, &sdrc_actim_base->ctrlb);
- writel(rfr_ctrl, &sdrc_base->cs[cs].rfr_ctrl);
+ writel(timings->mcfg, &sdrc_base->cs[cs].mcfg);
+ writel(timings->ctrla, &sdrc_actim_base->ctrla);
+ writel(timings->ctrlb, &sdrc_actim_base->ctrlb);
+ writel(timings->rfr_ctrl, &sdrc_base->cs[cs].rfr_ctrl);
writel(CMD_NOP, &sdrc_base->cs[cs].manual);
writel(CMD_PRECHARGE, &sdrc_base->cs[cs].manual);
writel(CMD_AUTOREFRESH, &sdrc_base->cs[cs].manual);
writel(CMD_AUTOREFRESH, &sdrc_base->cs[cs].manual);
- writel(mr, &sdrc_base->cs[cs].mr);
+ writel(timings->mr, &sdrc_base->cs[cs].mr);
/*
* Test ram in this bank
@@ -143,7 +143,7 @@ static void write_sdrc_timings(u32 cs, struct sdrc_actim *sdrc_actim_base,
void do_sdrc_init(u32 cs, u32 early)
{
struct sdrc_actim *sdrc_actim_base0, *sdrc_actim_base1;
- u32 mcfg, ctrla, ctrlb, rfr_ctrl, mr;
+ struct board_sdrc_timings timings;
sdrc_actim_base0 = (struct sdrc_actim *)SDRC_ACTIM_CTRL0_BASE;
sdrc_actim_base1 = (struct sdrc_actim *)SDRC_ACTIM_CTRL1_BASE;
@@ -158,7 +158,7 @@ void do_sdrc_init(u32 cs, u32 early)
* setup CS1.
*/
#ifdef CONFIG_SPL_BUILD
- get_board_mem_timings(&mcfg, &ctrla, &ctrlb, &rfr_ctrl, &mr);
+ get_board_mem_timings(&timings);
#endif
if (early) {
/* reset sdrc controller */
@@ -177,11 +177,9 @@ void do_sdrc_init(u32 cs, u32 early)
writel(ENADLL | DLLPHASE_90, &sdrc_base->dlla_ctrl);
sdelay(0x20000);
#ifdef CONFIG_SPL_BUILD
- write_sdrc_timings(CS0, sdrc_actim_base0, mcfg, ctrla, ctrlb,
- rfr_ctrl, mr);
+ write_sdrc_timings(CS0, sdrc_actim_base0, &timings);
make_cs1_contiguous();
- write_sdrc_timings(CS1, sdrc_actim_base1, mcfg, ctrla, ctrlb,
- rfr_ctrl, mr);
+ write_sdrc_timings(CS1, sdrc_actim_base1, &timings);
#endif
}
@@ -193,14 +191,12 @@ void do_sdrc_init(u32 cs, u32 early)
* so we may be asked now to setup CS1.
*/
if (cs == CS1) {
- mcfg = readl(&sdrc_base->cs[CS0].mcfg),
- rfr_ctrl = readl(&sdrc_base->cs[CS0].rfr_ctrl);
- ctrla = readl(&sdrc_actim_base0->ctrla),
- ctrlb = readl(&sdrc_actim_base0->ctrlb);
- mr = readl(&sdrc_base->cs[CS0].mr);
- write_sdrc_timings(cs, sdrc_actim_base1, mcfg, ctrla, ctrlb,
- rfr_ctrl, mr);
-
+ timings.mcfg = readl(&sdrc_base->cs[CS0].mcfg),
+ timings.rfr_ctrl = readl(&sdrc_base->cs[CS0].rfr_ctrl);
+ timings.ctrla = readl(&sdrc_actim_base0->ctrla);
+ timings.ctrlb = readl(&sdrc_actim_base0->ctrlb);
+ timings.mr = readl(&sdrc_base->cs[CS0].mr);
+ write_sdrc_timings(cs, sdrc_actim_base1, &timings);
}
}
diff --git a/arch/arm/cpu/armv7/omap4/clocks.c b/arch/arm/cpu/armv7/omap4/clocks.c
index 5bd0a88..12c5803 100644
--- a/arch/arm/cpu/armv7/omap4/clocks.c
+++ b/arch/arm/cpu/armv7/omap4/clocks.c
@@ -44,7 +44,7 @@
*/
#define printf(fmt, args...)
#define puts(s)
-#endif
+#endif /* !CONFIG_SPL_BUILD */
struct omap4_prcm_regs *const prcm = (struct omap4_prcm_regs *)0x4A004100;
diff --git a/arch/arm/cpu/armv7/omap4/hwinit.c b/arch/arm/cpu/armv7/omap4/hwinit.c
index 2c34e48..f4123aa 100644
--- a/arch/arm/cpu/armv7/omap4/hwinit.c
+++ b/arch/arm/cpu/armv7/omap4/hwinit.c
@@ -116,7 +116,7 @@ void do_io_settings(void)
if ((omap4_rev < OMAP4460_ES1_0) || !readl(&ctrl->control_efuse_2))
writel(CONTROL_EFUSE_2_OVERRIDE, &ctrl->control_efuse_2);
}
-#endif
+#endif /* CONFIG_SPL_BUILD */
/* dummy fuction for omap4 */
void config_data_eye_leveling_samples(u32 emif_base)
@@ -182,4 +182,4 @@ void v7_outer_cache_disable(void)
{
set_pl310_ctrl_reg(0);
}
-#endif
+#endif /* !CONFIG_SYS_L2CACHE_OFF */
diff --git a/arch/arm/include/asm/arch-am33xx/cpu.h b/arch/arm/include/asm/arch-am33xx/cpu.h
index d6c038e..16e8a80 100644
--- a/arch/arm/include/asm/arch-am33xx/cpu.h
+++ b/arch/arm/include/asm/arch-am33xx/cpu.h
@@ -60,6 +60,59 @@
#ifndef __KERNEL_STRICT_NAMES
#ifndef __ASSEMBLY__
+struct gpmc_cs {
+ u32 config1; /* 0x00 */
+ u32 config2; /* 0x04 */
+ u32 config3; /* 0x08 */
+ u32 config4; /* 0x0C */
+ u32 config5; /* 0x10 */
+ u32 config6; /* 0x14 */
+ u32 config7; /* 0x18 */
+ u32 nand_cmd; /* 0x1C */
+ u32 nand_adr; /* 0x20 */
+ u32 nand_dat; /* 0x24 */
+ u8 res[8]; /* blow up to 0x30 byte */
+};
+
+struct bch_res_0_3 {
+ u32 bch_result_x[4];
+};
+
+struct gpmc {
+ u8 res1[0x10];
+ u32 sysconfig; /* 0x10 */
+ u8 res2[0x4];
+ u32 irqstatus; /* 0x18 */
+ u32 irqenable; /* 0x1C */
+ u8 res3[0x20];
+ u32 timeout_control; /* 0x40 */
+ u8 res4[0xC];
+ u32 config; /* 0x50 */
+ u32 status; /* 0x54 */
+ u8 res5[0x8]; /* 0x58 */
+ struct gpmc_cs cs[8]; /* 0x60, 0x90, .. */
+ u8 res6[0x14]; /* 0x1E0 */
+ u32 ecc_config; /* 0x1F4 */
+ u32 ecc_control; /* 0x1F8 */
+ u32 ecc_size_config; /* 0x1FC */
+ u32 ecc1_result; /* 0x200 */
+ u32 ecc2_result; /* 0x204 */
+ u32 ecc3_result; /* 0x208 */
+ u32 ecc4_result; /* 0x20C */
+ u32 ecc5_result; /* 0x210 */
+ u32 ecc6_result; /* 0x214 */
+ u32 ecc7_result; /* 0x218 */
+ u32 ecc8_result; /* 0x21C */
+ u32 ecc9_result; /* 0x220 */
+ u8 res7[12]; /* 0x224 */
+ u32 testmomde_ctrl; /* 0x230 */
+ u8 res8[12]; /* 0x234 */
+ struct bch_res_0_3 bch_result_0_3[2]; /* 0x240 */
+};
+
+/* Used for board specific gpmc initialization */
+extern struct gpmc *gpmc_cfg;
+
/* Encapsulating core pll registers */
struct cm_wkuppll {
unsigned int wkclkstctrl; /* offset 0x00 */
diff --git a/arch/arm/include/asm/arch-am33xx/elm.h b/arch/arm/include/asm/arch-am33xx/elm.h
new file mode 100644
index 0000000..e80f7d4
--- /dev/null
+++ b/arch/arm/include/asm/arch-am33xx/elm.h
@@ -0,0 +1,93 @@
+/*
+ * (C) Copyright 2010-2011 Texas Instruments, <www.ti.com>
+ * Mansoor Ahamed <mansoor.ahamed@ti.com>
+ *
+ * Derived from work done by Rohit Choraria <rohitkc@ti.com> for omap3
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#ifndef __ASM_ARCH_ELM_H
+#define __ASM_ARCH_ELM_H
+/*
+ * ELM Module Registers
+ */
+
+/* ELM registers bit fields */
+#define ELM_SYSCONFIG_SOFTRESET_MASK (0x2)
+#define ELM_SYSCONFIG_SOFTRESET (0x2)
+#define ELM_SYSSTATUS_RESETDONE_MASK (0x1)
+#define ELM_SYSSTATUS_RESETDONE (0x1)
+#define ELM_LOCATION_CONFIG_ECC_BCH_LEVEL_MASK (0x3)
+#define ELM_LOCATION_CONFIG_ECC_SIZE_MASK (0x7FF0000)
+#define ELM_LOCATION_CONFIG_ECC_SIZE_POS (16)
+#define ELM_SYNDROME_FRAGMENT_6_SYNDROME_VALID (0x00010000)
+#define ELM_LOCATION_STATUS_ECC_CORRECTABLE_MASK (0x100)
+#define ELM_LOCATION_STATUS_ECC_NB_ERRORS_MASK (0x1F)
+
+#ifndef __ASSEMBLY__
+
+enum bch_level {
+ BCH_4_BIT = 0,
+ BCH_8_BIT,
+ BCH_16_BIT
+};
+
+
+/* BCH syndrome registers */
+struct syndrome {
+ u32 syndrome_fragment_x[7]; /* 0x400, 0x404.... 0x418 */
+ u8 res1[36]; /* 0x41c */
+};
+
+/* BCH error status & location register */
+struct location {
+ u32 location_status; /* 0x800 */
+ u8 res1[124]; /* 0x804 */
+ u32 error_location_x[16]; /* 0x880.... */
+ u8 res2[64]; /* 0x8c0 */
+};
+
+/* BCH ELM register map - do not try to allocate memmory for this structure.
+ * We have used plenty of reserved variables to fill the slots in the ELM
+ * register memory map.
+ * Directly initialize the struct pointer to ELM base address.
+ */
+struct elm {
+ u32 rev; /* 0x000 */
+ u8 res1[12]; /* 0x004 */
+ u32 sysconfig; /* 0x010 */
+ u32 sysstatus; /* 0x014 */
+ u32 irqstatus; /* 0x018 */
+ u32 irqenable; /* 0x01c */
+ u32 location_config; /* 0x020 */
+ u8 res2[92]; /* 0x024 */
+ u32 page_ctrl; /* 0x080 */
+ u8 res3[892]; /* 0x084 */
+ struct syndrome syndrome_fragments[8]; /* 0x400 */
+ u8 res4[512]; /* 0x600 */
+ struct location error_location[8]; /* 0x800 */
+};
+
+int elm_check_error(u8 *syndrome, u32 nibbles, u32 *error_count,
+ u32 *error_locations);
+int elm_config(enum bch_level level);
+void elm_reset(void);
+void elm_init(void);
+#endif /* __ASSEMBLY__ */
+#endif /* __ASM_ARCH_ELM_H */
diff --git a/arch/arm/include/asm/arch-am33xx/hardware.h b/arch/arm/include/asm/arch-am33xx/hardware.h
index 24ab365..6dd3296 100644
--- a/arch/arm/include/asm/arch-am33xx/hardware.h
+++ b/arch/arm/include/asm/arch-am33xx/hardware.h
@@ -80,6 +80,9 @@
#define DDRPHY_0_CONFIG_BASE (CTRL_BASE + 0x1400)
#define DDRPHY_CONFIG_BASE DDRPHY_0_CONFIG_BASE
+/* GPMC Base address */
+#define GPMC_BASE 0x50000000
+
/* CPSW Config space */
#define AM335X_CPSW_BASE 0x4A100000
#define AM335X_CPSW_MDIO_BASE 0x4A101000
diff --git a/arch/arm/include/asm/arch-am33xx/mem.h b/arch/arm/include/asm/arch-am33xx/mem.h
new file mode 100644
index 0000000..c3bf74e
--- /dev/null
+++ b/arch/arm/include/asm/arch-am33xx/mem.h
@@ -0,0 +1,83 @@
+/*
+ * (C) Copyright 2006-2008
+ * Texas Instruments, <www.ti.com>
+ *
+ * Author
+ * Mansoor Ahamed <mansoor.ahamed@ti.com>
+ *
+ * Initial Code from:
+ * Richard Woodruff <r-woodruff2@ti.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef _MEM_H_
+#define _MEM_H_
+
+/*
+ * GPMC settings -
+ * Definitions is as per the following format
+ * #define <PART>_GPMC_CONFIG<x> <value>
+ * Where:
+ * PART is the part name e.g. STNOR - Intel Strata Flash
+ * x is GPMC config registers from 1 to 6 (there will be 6 macros)
+ * Value is corresponding value
+ *
+ * For every valid PRCM configuration there should be only one definition of
+ * the same. if values are independent of the board, this definition will be
+ * present in this file if values are dependent on the board, then this should
+ * go into corresponding mem-boardName.h file
+ *
+ * Currently valid part Names are (PART):
+ * M_NAND - Micron NAND
+ */
+#define GPMC_SIZE_256M 0x0
+#define GPMC_SIZE_128M 0x8
+#define GPMC_SIZE_64M 0xC
+#define GPMC_SIZE_32M 0xE
+#define GPMC_SIZE_16M 0xF
+
+#define M_NAND_GPMC_CONFIG1 0x00000800
+#define M_NAND_GPMC_CONFIG2 0x001e1e00
+#define M_NAND_GPMC_CONFIG3 0x001e1e00
+#define M_NAND_GPMC_CONFIG4 0x16051807
+#define M_NAND_GPMC_CONFIG5 0x00151e1e
+#define M_NAND_GPMC_CONFIG6 0x16000f80
+#define M_NAND_GPMC_CONFIG7 0x00000008
+
+/* max number of GPMC Chip Selects */
+#define GPMC_MAX_CS 8
+/* max number of GPMC regs */
+#define GPMC_MAX_REG 7
+
+#define PISMO1_NOR 1
+#define PISMO1_NAND 2
+#define PISMO2_CS0 3
+#define PISMO2_CS1 4
+#define PISMO1_ONENAND 5
+#define DBG_MPDB 6
+#define PISMO2_NAND_CS0 7
+#define PISMO2_NAND_CS1 8
+
+/* make it readable for the gpmc_init */
+#define PISMO1_NOR_BASE FLASH_BASE
+#define PISMO1_NAND_BASE CONFIG_SYS_NAND_BASE
+#define PISMO1_NAND_SIZE GPMC_SIZE_256M
+
+#endif /* endif _MEM_H_ */
diff --git a/arch/arm/include/asm/arch-am33xx/omap_gpmc.h b/arch/arm/include/asm/arch-am33xx/omap_gpmc.h
new file mode 100644
index 0000000..572f9d0
--- /dev/null
+++ b/arch/arm/include/asm/arch-am33xx/omap_gpmc.h
@@ -0,0 +1,120 @@
+/*
+ * (C) Copyright 2004-2008 Texas Instruments, <www.ti.com>
+ * Rohit Choraria <rohitkc@ti.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#ifndef __ASM_ARCH_OMAP_GPMC_H
+#define __ASM_ARCH_OMAP_GPMC_H
+
+#define GPMC_BUF_EMPTY 0
+#define GPMC_BUF_FULL 1
+
+#define ECCCLEAR (0x1 << 8)
+#define ECCRESULTREG1 (0x1 << 0)
+#define ECCSIZE512BYTE 0xFF
+#define ECCSIZE1 (ECCSIZE512BYTE << 22)
+#define ECCSIZE0 (ECCSIZE512BYTE << 12)
+#define ECCSIZE0SEL (0x000 << 0)
+
+/* Generic ECC Layouts */
+/* Large Page x8 NAND device Layout */
+#ifdef GPMC_NAND_ECC_LP_x8_LAYOUT
+#define GPMC_NAND_HW_ECC_LAYOUT {\
+ .eccbytes = 12,\
+ .eccpos = {1, 2, 3, 4, 5, 6, 7, 8,\
+ 9, 10, 11, 12},\
+ .oobfree = {\
+ {.offset = 13,\
+ .length = 51 } } \
+}
+#endif
+
+/* Large Page x16 NAND device Layout */
+#ifdef GPMC_NAND_ECC_LP_x16_LAYOUT
+#define GPMC_NAND_HW_ECC_LAYOUT {\
+ .eccbytes = 12,\
+ .eccpos = {2, 3, 4, 5, 6, 7, 8, 9,\
+ 10, 11, 12, 13},\
+ .oobfree = {\
+ {.offset = 14,\
+ .length = 50 } } \
+}
+#endif
+
+/* Small Page x8 NAND device Layout */
+#ifdef GPMC_NAND_ECC_SP_x8_LAYOUT
+#define GPMC_NAND_HW_ECC_LAYOUT {\
+ .eccbytes = 3,\
+ .eccpos = {1, 2, 3},\
+ .oobfree = {\
+ {.offset = 4,\
+ .length = 12 } } \
+}
+#endif
+
+/* Small Page x16 NAND device Layout */
+#ifdef GPMC_NAND_ECC_SP_x16_LAYOUT
+#define GPMC_NAND_HW_ECC_LAYOUT {\
+ .eccbytes = 3,\
+ .eccpos = {2, 3, 4},\
+ .oobfree = {\
+ {.offset = 5,\
+ .length = 11 } } \
+}
+#endif
+
+#define GPMC_NAND_HW_BCH4_ECC_LAYOUT {\
+ .eccbytes = 32,\
+ .eccpos = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,\
+ 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,\
+ 28, 29, 30, 31, 32, 33},\
+ .oobfree = {\
+ {.offset = 34,\
+ .length = 30 } } \
+}
+
+#define GPMC_NAND_HW_BCH8_ECC_LAYOUT {\
+ .eccbytes = 56,\
+ .eccpos = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,\
+ 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,\
+ 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39,\
+ 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,\
+ 52, 53, 54, 55, 56, 57},\
+ .oobfree = {\
+ {.offset = 58,\
+ .length = 6 } } \
+}
+
+#define GPMC_NAND_HW_BCH16_ECC_LAYOUT {\
+ .eccbytes = 104,\
+ .eccpos = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,\
+ 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,\
+ 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39,\
+ 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,\
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,\
+ 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75,\
+ 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87,\
+ 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99,\
+ 100, 101, 102, 103, 104, 105},\
+ .oobfree = {\
+ {.offset = 106,\
+ .length = 8 } } \
+}
+#endif /* __ASM_ARCH_OMAP_GPMC_H */
diff --git a/arch/arm/include/asm/arch-am33xx/sys_proto.h b/arch/arm/include/asm/arch-am33xx/sys_proto.h
index 9cf35e0..588d8de 100644
--- a/arch/arm/include/asm/arch-am33xx/sys_proto.h
+++ b/arch/arm/include/asm/arch-am33xx/sys_proto.h
@@ -33,4 +33,7 @@ u32 get_device_type(void);
void setup_clocks_for_console(void);
void ddr_pll_config(unsigned int ddrpll_M);
+void sdelay(unsigned long);
+void gpmc_init(void);
+void omap_nand_switch_ecc(int);
#endif
diff --git a/arch/arm/include/asm/arch-omap3/sys_proto.h b/arch/arm/include/asm/arch-omap3/sys_proto.h
index 9e52b12..d60f2ad 100644
--- a/arch/arm/include/asm/arch-omap3/sys_proto.h
+++ b/arch/arm/include/asm/arch-omap3/sys_proto.h
@@ -32,6 +32,15 @@ struct emu_hal_params {
u32 param1;
};
+/* Board SDRC timing values */
+struct board_sdrc_timings {
+ u32 mcfg;
+ u32 ctrla;
+ u32 ctrlb;
+ u32 rfr_ctrl;
+ u32 mr;
+};
+
void prcm_init(void);
void per_clocks_enable(void);
void ehci_clocks_enable(void);
@@ -39,8 +48,8 @@ void ehci_clocks_enable(void);
void memif_init(void);
void sdrc_init(void);
void do_sdrc_init(u32, u32);
-void get_board_mem_timings(u32 *mcfg, u32 *ctrla, u32 *ctrlb, u32 *rfr_ctrl,
- u32 *mr);
+
+void get_board_mem_timings(struct board_sdrc_timings *timings);
void identify_nand_chip(int *mfr, int *id);
void emif4_init(void);
void gpmc_init(void);
diff --git a/arch/arm/include/asm/omap_gpio.h b/arch/arm/include/asm/omap_gpio.h
index 516cc42..1ebfa86 100644
--- a/arch/arm/include/asm/omap_gpio.h
+++ b/arch/arm/include/asm/omap_gpio.h
@@ -49,4 +49,11 @@ extern const struct gpio_bank *const omap_gpio_bank;
#define METHOD_GPIO_24XX 4
+/**
+ * Check if gpio is valid.
+ *
+ * @param gpio GPIO number
+ * @return 1 if ok, 0 on error
+ */
+int gpio_is_valid(int gpio);
#endif /* _GPIO_H_ */