[PATCH] cpuidle: kirkwood: Move out of mach directory, add DT.
Rob Herring
robherring2 at gmail.com
Fri Dec 28 09:18:42 EST 2012
On 12/28/2012 06:47 AM, Andrew Lunn wrote:
> Move the Kirkwood cpuidle driver out of arch/arm/mach-kirkwood and
> into drivers/cpuidle. Convert the driver into a platform driver and
> add a device tree binding. Add a DT node to instantiate the driver for
> boards converted to DT, and a platform data for old style boards.
Is this an old comment? I don't see any platform data.
>
> Signed-off-by: Andrew Lunn <andrew at lunn.ch>
> ---
> .../devicetree/bindings/power/qnap-poweroff.txt | 14 +++
> arch/arm/boot/dts/kirkwood.dtsi | 5 +
> arch/arm/configs/kirkwood_defconfig | 1 +
> arch/arm/mach-kirkwood/Makefile | 1 -
> arch/arm/mach-kirkwood/common.c | 23 ++++
> arch/arm/mach-kirkwood/cpuidle.c | 73 -------------
> arch/arm/mach-kirkwood/include/mach/kirkwood.h | 3 +-
> drivers/cpuidle/Kconfig | 6 ++
> drivers/cpuidle/Makefile | 1 +
> drivers/cpuidle/cpuidle-kirkwood.c | 114 ++++++++++++++++++++
> 10 files changed, 166 insertions(+), 75 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/power/qnap-poweroff.txt
> delete mode 100644 arch/arm/mach-kirkwood/cpuidle.c
> create mode 100644 drivers/cpuidle/cpuidle-kirkwood.c
>
> diff --git a/Documentation/devicetree/bindings/power/qnap-poweroff.txt b/Documentation/devicetree/bindings/power/qnap-poweroff.txt
> new file mode 100644
> index 0000000..e15a334
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/qnap-poweroff.txt
> @@ -0,0 +1,14 @@
> +* QNAP Power Off
This doesn't match the rest of the patch.
> +
> +QNAP NAS devices have a microcontroller controlling the main power
> +supply. This microcontroller is connected to UART1 of the Kirkwood and
> +Orion5x SoCs. Sending the charactor 'A', at 19200 baud, tells the
> +microcontroller to turn the power off. This driver adds a handler to
> +pm_power_off which is called to turn the power off.
> +
> +Required Properties:
> +- compatibile: Should be "qnap,power-off"
> +
> +- reg: Address and length of the register set for UART1
> +- clocks: tclk clock
> +
> diff --git a/arch/arm/boot/dts/kirkwood.dtsi b/arch/arm/boot/dts/kirkwood.dtsi
> index 7735cee..ca99aa2 100644
> --- a/arch/arm/boot/dts/kirkwood.dtsi
> +++ b/arch/arm/boot/dts/kirkwood.dtsi
> @@ -23,6 +23,11 @@
> #address-cells = <1>;
> #size-cells = <1>;
>
> + cpuidle at 1418 {
> + compatible = "marvell,kirkwood-cpuidle";
> + reg = <0x1418 0x4>;
> + };
> +
This is describing what linux wants, not the hardware. This is a common
problem with cpuidle drivers in that they use shared registers. I don't
have a good solution, but this doesn't belong in DTS.
Rob
> core_clk: core-clocks at 10030 {
> compatible = "marvell,kirkwood-core-clock";
> reg = <0x10030 0x4>;
> diff --git a/arch/arm/configs/kirkwood_defconfig b/arch/arm/configs/kirkwood_defconfig
> index 93f3794..13482ea 100644
> --- a/arch/arm/configs/kirkwood_defconfig
> +++ b/arch/arm/configs/kirkwood_defconfig
> @@ -56,6 +56,7 @@ CONFIG_AEABI=y
> CONFIG_ZBOOT_ROM_TEXT=0x0
> CONFIG_ZBOOT_ROM_BSS=0x0
> CONFIG_CPU_IDLE=y
> +CONFIG_CPU_IDLE_KIRKWOOD=y
> CONFIG_NET=y
> CONFIG_PACKET=y
> CONFIG_UNIX=y
> diff --git a/arch/arm/mach-kirkwood/Makefile b/arch/arm/mach-kirkwood/Makefile
> index 8d2e5a9..d665309 100644
> --- a/arch/arm/mach-kirkwood/Makefile
> +++ b/arch/arm/mach-kirkwood/Makefile
> @@ -19,7 +19,6 @@ obj-$(CONFIG_MACH_NET2BIG_V2) += netxbig_v2-setup.o lacie_v2-common.o
> obj-$(CONFIG_MACH_NET5BIG_V2) += netxbig_v2-setup.o lacie_v2-common.o
> obj-$(CONFIG_MACH_T5325) += t5325-setup.o
>
> -obj-$(CONFIG_CPU_IDLE) += cpuidle.o
> obj-$(CONFIG_ARCH_KIRKWOOD_DT) += board-dt.o
> obj-$(CONFIG_MACH_DREAMPLUG_DT) += board-dreamplug.o
> obj-$(CONFIG_MACH_ICONNECT_DT) += board-iconnect.o
> diff --git a/arch/arm/mach-kirkwood/common.c b/arch/arm/mach-kirkwood/common.c
> index bac21a5..e8a2978 100644
> --- a/arch/arm/mach-kirkwood/common.c
> +++ b/arch/arm/mach-kirkwood/common.c
> @@ -499,6 +499,28 @@ void __init kirkwood_wdt_init(void)
> orion_wdt_init();
> }
>
> +/*****************************************************************************
> + * CPU idle
> + ****************************************************************************/
> +static struct resource kirkwood_cpuidle_resource[] = {
> + {
> + .flags = IORESOURCE_MEM,
> + .start = DDR_OPERATION_BASE,
> + .end = 3,
> + },
> +};
> +
> +static struct platform_device kirkwood_cpuidle = {
> + .name = "kirkwood_cpuidle",
> + .id = -1,
> + .resource = kirkwood_cpuidle_resource,
> + .num_resources = 1,
> +};
> +
> +static void __init kirkwood_cpuidle_init(void)
> +{
> + platform_device_register(&kirkwood_cpuidle);
> +}
>
> /*****************************************************************************
> * Time handling
> @@ -671,6 +693,7 @@ void __init kirkwood_init(void)
> kirkwood_xor1_init();
> kirkwood_crypto_init();
>
> + kirkwood_cpuidle_init();
> #ifdef CONFIG_KEXEC
> kexec_reinit = kirkwood_enable_pcie;
> #endif
> diff --git a/arch/arm/mach-kirkwood/cpuidle.c b/arch/arm/mach-kirkwood/cpuidle.c
> deleted file mode 100644
> index f730467..0000000
> --- a/arch/arm/mach-kirkwood/cpuidle.c
> +++ /dev/null
> @@ -1,73 +0,0 @@
> -/*
> - * arch/arm/mach-kirkwood/cpuidle.c
> - *
> - * CPU idle Marvell Kirkwood SoCs
> - *
> - * This file is licensed under the terms of the GNU General Public
> - * License version 2. This program is licensed "as is" without any
> - * warranty of any kind, whether express or implied.
> - *
> - * The cpu idle uses wait-for-interrupt and DDR self refresh in order
> - * to implement two idle states -
> - * #1 wait-for-interrupt
> - * #2 wait-for-interrupt and DDR self refresh
> - */
> -
> -#include <linux/kernel.h>
> -#include <linux/init.h>
> -#include <linux/platform_device.h>
> -#include <linux/cpuidle.h>
> -#include <linux/io.h>
> -#include <linux/export.h>
> -#include <asm/proc-fns.h>
> -#include <asm/cpuidle.h>
> -#include <mach/kirkwood.h>
> -
> -#define KIRKWOOD_MAX_STATES 2
> -
> -/* Actual code that puts the SoC in different idle states */
> -static int kirkwood_enter_idle(struct cpuidle_device *dev,
> - struct cpuidle_driver *drv,
> - int index)
> -{
> - writel(0x7, DDR_OPERATION_BASE);
> - cpu_do_idle();
> -
> - return index;
> -}
> -
> -static struct cpuidle_driver kirkwood_idle_driver = {
> - .name = "kirkwood_idle",
> - .owner = THIS_MODULE,
> - .en_core_tk_irqen = 1,
> - .states[0] = ARM_CPUIDLE_WFI_STATE,
> - .states[1] = {
> - .enter = kirkwood_enter_idle,
> - .exit_latency = 10,
> - .target_residency = 100000,
> - .flags = CPUIDLE_FLAG_TIME_VALID,
> - .name = "DDR SR",
> - .desc = "WFI and DDR Self Refresh",
> - },
> - .state_count = KIRKWOOD_MAX_STATES,
> -};
> -
> -static DEFINE_PER_CPU(struct cpuidle_device, kirkwood_cpuidle_device);
> -
> -/* Initialize CPU idle by registering the idle states */
> -static int kirkwood_init_cpuidle(void)
> -{
> - struct cpuidle_device *device;
> -
> - device = &per_cpu(kirkwood_cpuidle_device, smp_processor_id());
> - device->state_count = KIRKWOOD_MAX_STATES;
> -
> - cpuidle_register_driver(&kirkwood_idle_driver);
> - if (cpuidle_register_device(device)) {
> - pr_err("kirkwood_init_cpuidle: Failed registering\n");
> - return -EIO;
> - }
> - return 0;
> -}
> -
> -device_initcall(kirkwood_init_cpuidle);
> diff --git a/arch/arm/mach-kirkwood/include/mach/kirkwood.h b/arch/arm/mach-kirkwood/include/mach/kirkwood.h
> index 041653a..a05563a 100644
> --- a/arch/arm/mach-kirkwood/include/mach/kirkwood.h
> +++ b/arch/arm/mach-kirkwood/include/mach/kirkwood.h
> @@ -60,8 +60,9 @@
> * Register Map
> */
> #define DDR_VIRT_BASE (KIRKWOOD_REGS_VIRT_BASE + 0x00000)
> +#define DDR_PHYS_BASE (KIRKWOOD_REGS_PHYS_BASE + 0x00000)
> #define DDR_WINDOW_CPU_BASE (DDR_VIRT_BASE + 0x1500)
> -#define DDR_OPERATION_BASE (DDR_VIRT_BASE + 0x1418)
> +#define DDR_OPERATION_BASE (DDR_PHYS_BASE + 0x1418)
>
> #define DEV_BUS_PHYS_BASE (KIRKWOOD_REGS_PHYS_BASE + 0x10000)
> #define DEV_BUS_VIRT_BASE (KIRKWOOD_REGS_VIRT_BASE + 0x10000)
> diff --git a/drivers/cpuidle/Kconfig b/drivers/cpuidle/Kconfig
> index c4cc27e..071e2c3 100644
> --- a/drivers/cpuidle/Kconfig
> +++ b/drivers/cpuidle/Kconfig
> @@ -39,4 +39,10 @@ config CPU_IDLE_CALXEDA
> help
> Select this to enable cpuidle on Calxeda processors.
>
> +config CPU_IDLE_KIRKWOOD
> + bool "CPU Idle Driver for Kirkwood processors"
> + depends on ARCH_KIRKWOOD
> + help
> + Select this to enable cpuidle on Kirkwood processors.
> +
> endif
> diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile
> index 03ee874..24c6e7d 100644
> --- a/drivers/cpuidle/Makefile
> +++ b/drivers/cpuidle/Makefile
> @@ -6,3 +6,4 @@ obj-y += cpuidle.o driver.o governor.o sysfs.o governors/
> obj-$(CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED) += coupled.o
>
> obj-$(CONFIG_CPU_IDLE_CALXEDA) += cpuidle-calxeda.o
> +obj-$(CONFIG_CPU_IDLE_KIRKWOOD) += cpuidle-kirkwood.o
> diff --git a/drivers/cpuidle/cpuidle-kirkwood.c b/drivers/cpuidle/cpuidle-kirkwood.c
> new file mode 100644
> index 0000000..2d9d5b3
> --- /dev/null
> +++ b/drivers/cpuidle/cpuidle-kirkwood.c
> @@ -0,0 +1,114 @@
> +/*
> + * arch/arm/mach-kirkwood/cpuidle.c
> + *
> + * CPU idle Marvell Kirkwood SoCs
> + *
> + * This file is licensed under the terms of the GNU General Public
> + * License version 2. This program is licensed "as is" without any
> + * warranty of any kind, whether express or implied.
> + *
> + * The cpu idle uses wait-for-interrupt and DDR self refresh in order
> + * to implement two idle states -
> + * #1 wait-for-interrupt
> + * #2 wait-for-interrupt and DDR self refresh
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/platform_device.h>
> +#include <linux/cpuidle.h>
> +#include <linux/io.h>
> +#include <linux/export.h>
> +#include <linux/of.h>
> +#include <asm/proc-fns.h>
> +#include <asm/cpuidle.h>
> +
> +#define KIRKWOOD_MAX_STATES 2
> +
> +static void __iomem *ddr_operation_base;
> +
> +/* Actual code that puts the SoC in different idle states */
> +static int kirkwood_enter_idle(struct cpuidle_device *dev,
> + struct cpuidle_driver *drv,
> + int index)
> +{
> + writel(0x7, ddr_operation_base);
> + cpu_do_idle();
> +
> + return index;
> +}
> +
> +static struct cpuidle_driver kirkwood_idle_driver = {
> + .name = "kirkwood_idle",
> + .owner = THIS_MODULE,
> + .en_core_tk_irqen = 1,
> + .states[0] = ARM_CPUIDLE_WFI_STATE,
> + .states[1] = {
> + .enter = kirkwood_enter_idle,
> + .exit_latency = 10,
> + .target_residency = 100000,
> + .flags = CPUIDLE_FLAG_TIME_VALID,
> + .name = "DDR SR",
> + .desc = "WFI and DDR Self Refresh",
> + },
> + .state_count = KIRKWOOD_MAX_STATES,
> +};
> +static struct cpuidle_device *device;
> +
> +static DEFINE_PER_CPU(struct cpuidle_device, kirkwood_cpuidle_device);
> +
> +/* Initialize CPU idle by registering the idle states */
> +static int kirkwood_cpuidle_probe(struct platform_device *pdev)
> +{
> + struct resource *res;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (res == NULL)
> + return -EINVAL;
> +
> + ddr_operation_base = devm_ioremap(&pdev->dev, res->start,
> + resource_size(res));
> + if (ddr_operation_base == NULL)
> + return -EINVAL;
> +
> + device = &per_cpu(kirkwood_cpuidle_device, smp_processor_id());
> + device->state_count = KIRKWOOD_MAX_STATES;
> +
> + cpuidle_register_driver(&kirkwood_idle_driver);
> + if (cpuidle_register_device(device)) {
> + pr_err("kirkwood_init_cpuidle: Failed registering\n");
> + return -EIO;
> + }
> + return 0;
> +}
> +
> +int kirkwood_cpuidle_remove(struct platform_device *pdev)
> +{
> + cpuidle_unregister_device(device);
> + cpuidle_unregister_driver(&kirkwood_idle_driver);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id of_kirkwood_cpuidle_match[] = {
> + { .compatible = "marvell,kirkwood-cpuidle", },
> + {},
> +};
> +
> +static struct platform_driver kirkwood_cpuidle_driver = {
> + .probe = kirkwood_cpuidle_probe,
> + .remove = __devexit_p(kirkwood_cpuidle_remove),
> + .driver = {
> + .name = "kirkwood_cpuidle",
> + .owner = THIS_MODULE,
> + .of_match_table = of_kirkwood_cpuidle_match,
> + },
> +};
> +
> +module_platform_driver(kirkwood_cpuidle_driver);
> +
> +MODULE_AUTHOR("Andrew Lunn <andrew at lunn.ch>");
> +MODULE_DESCRIPTION("Kirkwood cpu idle driver");
> +MODULE_LICENSE("GPLv2");
> +MODULE_ALIAS("platform:kirkwood-cpuidle");
>
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