diff options
| author | Shawn Guo <shawn.guo@linaro.org> | 2013-03-29 02:33:09 +0100 |
|---|---|---|
| committer | Shawn Guo <shawn.guo@linaro.org> | 2013-04-01 14:42:13 +0200 |
| commit | 8f7cf8815f7d87534dda3657f03e925e58c1f5e1 (patch) | |
| tree | 02c73d48dcb2d821029c10af1294d4a12a21a223 | |
| parent | ARM: mxs: remove empty hardware.h (diff) | |
| download | linux-8f7cf8815f7d87534dda3657f03e925e58c1f5e1.tar.xz linux-8f7cf8815f7d87534dda3657f03e925e58c1f5e1.zip | |
ARM: mxs: get reset address from device tree
Instead of using static address definition, get reset address from
device tree with mapping, so that core_initcall mxs_arch_reset_init()
can be killed.
The "rtc" clock code in mxs_arch_reset_init() seems to be zombie, since
there is no clk lookup defined in clock driver at all. Remove it
together.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
| -rw-r--r-- | arch/arm/boot/dts/imx23.dtsi | 2 | ||||
| -rw-r--r-- | arch/arm/boot/dts/imx28.dtsi | 2 | ||||
| -rw-r--r-- | arch/arm/mach-mxs/system.c | 36 |
3 files changed, 19 insertions, 21 deletions
diff --git a/arch/arm/boot/dts/imx23.dtsi b/arch/arm/boot/dts/imx23.dtsi index 8d37aa7430a3..30b410b2e243 100644 --- a/arch/arm/boot/dts/imx23.dtsi +++ b/arch/arm/boot/dts/imx23.dtsi @@ -361,7 +361,7 @@ ranges; clks: clkctrl@80040000 { - compatible = "fsl,imx23-clkctrl"; + compatible = "fsl,imx23-clkctrl", "fsl,clkctrl"; reg = <0x80040000 0x2000>; #clock-cells = <1>; }; diff --git a/arch/arm/boot/dts/imx28.dtsi b/arch/arm/boot/dts/imx28.dtsi index d306ff55e30f..56d84bf208c7 100644 --- a/arch/arm/boot/dts/imx28.dtsi +++ b/arch/arm/boot/dts/imx28.dtsi @@ -756,7 +756,7 @@ ranges; clks: clkctrl@80040000 { - compatible = "fsl,imx28-clkctrl"; + compatible = "fsl,imx28-clkctrl", "fsl,clkctrl"; reg = <0x80040000 0x2000>; #clock-cells = <1>; }; diff --git a/arch/arm/mach-mxs/system.c b/arch/arm/mach-mxs/system.c index 30042e23bfa7..2d64ee9bbd3f 100644 --- a/arch/arm/mach-mxs/system.c +++ b/arch/arm/mach-mxs/system.c @@ -23,6 +23,8 @@ #include <linux/delay.h> #include <linux/init.h> #include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> #include <asm/proc-fns.h> #include <asm/system_misc.h> @@ -37,41 +39,37 @@ #define MXS_MODULE_CLKGATE (1 << 30) #define MXS_MODULE_SFTRST (1 << 31) -static void __iomem *mxs_clkctrl_reset_addr; - /* * Reset the system. It is called by machine_restart(). */ void mxs_restart(char mode, const char *cmd) { + struct device_node *np; + void __iomem *reset_addr; + + np = of_find_compatible_node(NULL, NULL, "fsl,clkctrl"); + reset_addr = of_iomap(np, 0); + if (!reset_addr) + goto soft; + + if (of_device_is_compatible(np, "fsl,imx23-clkctrl")) + reset_addr += MX23_CLKCTRL_RESET_OFFSET; + else + reset_addr += MX28_CLKCTRL_RESET_OFFSET; + /* reset the chip */ - __mxs_setl(MXS_CLKCTRL_RESET_CHIP, mxs_clkctrl_reset_addr); + __mxs_setl(MXS_CLKCTRL_RESET_CHIP, reset_addr); pr_err("Failed to assert the chip reset\n"); /* Delay to allow the serial port to show the message */ mdelay(50); +soft: /* We'll take a jump through zero as a poor second */ soft_restart(0); } -static int __init mxs_arch_reset_init(void) -{ - struct clk *clk; - - mxs_clkctrl_reset_addr = MXS_IO_ADDRESS(MXS_CLKCTRL_BASE_ADDR) + - (cpu_is_mx23() ? MX23_CLKCTRL_RESET_OFFSET : - MX28_CLKCTRL_RESET_OFFSET); - - clk = clk_get_sys("rtc", NULL); - if (!IS_ERR(clk)) - clk_prepare_enable(clk); - - return 0; -} -core_initcall(mxs_arch_reset_init); - /* * Clear the bit and poll it cleared. This is usually called with * a reset address and mask being either SFTRST(bit 31) or CLKGATE |