[PATCH 2/2] ARM i.MX: move reset source detection code
Sascha Hauer
s.hauer at pengutronix.de
Mon Oct 8 07:04:40 EDT 2012
- for i.MX1 the register is in the System Control unit, so move
the code to arch/arm/mach-imx/imx1.c
- for the other i.MX the register is in the watchdog unit, so move
the code to drivers/watchdog/imxwd.c
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
arch/arm/mach-imx/Makefile | 1 -
arch/arm/mach-imx/imx1.c | 27 ++++++++++++++
arch/arm/mach-imx/reset_source.c | 72 --------------------------------------
drivers/watchdog/imxwd.c | 34 ++++++++++++++++++
4 files changed, 61 insertions(+), 73 deletions(-)
delete mode 100644 arch/arm/mach-imx/reset_source.c
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index e43f92e..517a5a7 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -1,5 +1,4 @@
obj-y += clocksource.o gpio.o
-obj-$(CONFIG_RESET_SOURCE) += reset_source.o
obj-$(CONFIG_ARCH_IMX1) += imx1.o iomux-v1.o clk-imx1.o
obj-$(CONFIG_ARCH_IMX25) += imx25.o iomux-v3.o clk-imx25.o
obj-$(CONFIG_ARCH_IMX21) += imx21.o iomux-v1.o clk-imx21.o
diff --git a/arch/arm/mach-imx/imx1.c b/arch/arm/mach-imx/imx1.c
index 2b2b924..7ac16fd 100644
--- a/arch/arm/mach-imx/imx1.c
+++ b/arch/arm/mach-imx/imx1.c
@@ -16,6 +16,31 @@
#include <io.h>
#include <mach/imx-regs.h>
#include <mach/weim.h>
+#include <reset_source.h>
+
+#define MX1_RSR MX1_SCM_BASE_ADDR
+#define RSR_EXR (1 << 0)
+#define RSR_WDR (1 << 1)
+
+static void imx1_detect_reset_source(void)
+{
+ u32 val = readl((void *)MX1_RSR) & 0x3;
+
+ switch (val) {
+ case RSR_EXR:
+ set_reset_source(RESET_RST);
+ return;
+ case RSR_WDR:
+ set_reset_source(RESET_WDG);
+ return;
+ case 0:
+ set_reset_source(RESET_POR);
+ return;
+ default:
+ /* else keep the default 'unknown' state */
+ return;
+ }
+}
void imx1_setup_eimcs(size_t cs, unsigned upper, unsigned lower)
{
@@ -25,6 +50,8 @@ void imx1_setup_eimcs(size_t cs, unsigned upper, unsigned lower)
static int imx1_init(void)
{
+ imx1_detect_reset_source();
+
add_generic_device("imx1-ccm", 0, NULL, MX1_CCM_BASE_ADDR, 0x1000, IORESOURCE_MEM, NULL);
add_generic_device("imx1-gpt", 0, NULL, MX1_TIM1_BASE_ADDR, 0x100, IORESOURCE_MEM, NULL);
add_generic_device("imx1-gpio", 0, NULL, MX1_GPIO1_BASE_ADDR, 0x100, IORESOURCE_MEM, NULL);
diff --git a/arch/arm/mach-imx/reset_source.c b/arch/arm/mach-imx/reset_source.c
deleted file mode 100644
index e7b2a90..0000000
--- a/arch/arm/mach-imx/reset_source.c
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
- * (C) Copyright 2012 Juergen Beisert - <kernel at pengutronix.de>
- *
- * 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.
- */
-
-#include <common.h>
-#include <init.h>
-#include <io.h>
-#include <reset_source.h>
-#include <mach/imx-regs.h>
-
-#ifdef CONFIG_ARCH_IMX1
-# define IMX_RESET_SRC_WDOG (1 << 1)
-# define IMX_RESET_SRC_HRDRESET (1 << 0)
-/* let the compiler sort out useless code on this arch */
-# define IMX_RESET_SRC_WARMSTART 0
-# define IMX_RESET_SRC_COLDSTART 0
-#else
- /* WRSR checked for i.MX25, i.MX27, i.MX31, i.MX35 and i.MX51 */
-# define WDOG_WRSR 0x04
- /* valid for i.MX25, i.MX27, i.MX31, i.MX35, i.MX51 */
-# define IMX_RESET_SRC_WARMSTART (1 << 0)
- /* valid for i.MX25, i.MX27, i.MX31, i.MX35, i.MX51 */
-# define IMX_RESET_SRC_WDOG (1 << 1)
- /* valid for i.MX27, i.MX31, always '0' on i.MX25, i.MX35, i.MX51 */
-# define IMX_RESET_SRC_HRDRESET (1 << 3)
- /* valid for i.MX27, i.MX31, always '0' on i.MX25, i.MX35, i.MX51 */
-# define IMX_RESET_SRC_COLDSTART (1 << 4)
-#endif
-
-static unsigned read_detection_register(void)
-{
-#ifdef CONFIG_ARCH_IMX1
- return readl(IMX_SYSCTRL_BASE);
-#else
- return readw(IMX_WDT_BASE + WDOG_WRSR);
-#endif
-}
-
-static int imx_detect_reset_source(void)
-{
- unsigned reg = read_detection_register();
-
- if (reg & IMX_RESET_SRC_COLDSTART) {
- set_reset_source(RESET_POR);
- return 0;
- }
-
- if (reg & (IMX_RESET_SRC_HRDRESET | IMX_RESET_SRC_WARMSTART)) {
- set_reset_source(RESET_RST);
- return 0;
- }
-
- if (reg & IMX_RESET_SRC_WDOG) {
- set_reset_source(RESET_WDG);
- return 0;
- }
-
- /* else keep the default 'unknown' state */
- return 0;
-}
-
-device_initcall(imx_detect_reset_source);
diff --git a/drivers/watchdog/imxwd.c b/drivers/watchdog/imxwd.c
index 7bbb86c..c422f98 100644
--- a/drivers/watchdog/imxwd.c
+++ b/drivers/watchdog/imxwd.c
@@ -42,6 +42,15 @@ struct imx_wd {
#define IMX21_WDOG_WCR_SRS (1 << 4)
#define IMX21_WDOG_WCR_WDA (1 << 5)
+/* valid for i.MX25, i.MX27, i.MX31, i.MX35, i.MX51 */
+#define WSTR_WARMSTART (1 << 0)
+/* valid for i.MX25, i.MX27, i.MX31, i.MX35, i.MX51 */
+#define WSTR_WDOG (1 << 1)
+/* valid for i.MX27, i.MX31, always '0' on i.MX25, i.MX35, i.MX51 */
+#define WSTR_HARDRESET (1 << 3)
+/* valid for i.MX27, i.MX31, always '0' on i.MX25, i.MX35, i.MX51 */
+#define WSTR_COLDSTART (1 << 4)
+
static int imx1_watchdog_set_timeout(struct imx_wd *priv, int timeout)
{
u16 val;
@@ -115,6 +124,28 @@ void __noreturn reset_cpu(unsigned long addr)
hang();
}
+static void imx_watchdog_detect_reset_source(struct imx_wd *priv)
+{
+ u16 val = readw(priv->base + IMX21_WDOG_WSTR);
+
+ if (val & WSTR_COLDSTART) {
+ set_reset_source(RESET_POR);
+ return;
+ }
+
+ if (val & (WSTR_HARDRESET | WSTR_WARMSTART)) {
+ set_reset_source(RESET_RST);
+ return;
+ }
+
+ if (val & WSTR_WDOG) {
+ set_reset_source(RESET_WDG);
+ return;
+ }
+
+ /* else keep the default 'unknown' state */
+}
+
static int imx_wd_probe(struct device_d *dev)
{
struct imx_wd *priv;
@@ -140,6 +171,9 @@ static int imx_wd_probe(struct device_d *dev)
goto on_error;
}
+ if (fn != imx1_watchdog_set_timeout)
+ imx_watchdog_detect_reset_source(priv);
+
dev->priv = priv;
return 0;
--
1.7.10.4
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