Commit 6b6844dd authored by Abhilash Kesavan's avatar Abhilash Kesavan Committed by Kukjin Kim
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ARM: S5P64X0: Add Power Management support 



Add suspend-to-ram support for SMDK6440/50

Signed-off-by: default avatarAbhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: default avatarKukjin Kim <kgene.kim@samsung.com>
parent e2e13621

arch/arm/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -2093,7 +2093,7 @@ menu "Power management options" 
source "kernel/power/Kconfig"



config ARCH_SUSPEND_POSSIBLE

	depends on !ARCH_S5P64X0 && !ARCH_S5PC100

	depends on !ARCH_S5PC100

	depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \

		CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE

	def_bool y

arch/arm/mach-s5p64x0/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -11,6 +11,8 @@ config CPU_S5P6440 
	bool

	select SAMSUNG_DMADEV

	select S5P_HRT

	select S5P_SLEEP if PM

	select SAMSUNG_WAKEMASK if PM

	help

	  Enable S5P6440 CPU support
@@ -18,6 +20,8 @@ config CPU_S5P6450 
	bool

	select SAMSUNG_DMADEV

	select S5P_HRT

	select S5P_SLEEP if PM

	select SAMSUNG_WAKEMASK if PM

	help

	  Enable S5P6450 CPU support

arch/arm/mach-s5p64x0/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ obj-$(CONFIG_ARCH_S5P64X0) += cpu.o init.o clock.o dma.o 
obj-$(CONFIG_ARCH_S5P64X0)	+= setup-i2c0.o irq-eint.o

obj-$(CONFIG_CPU_S5P6440)	+= clock-s5p6440.o

obj-$(CONFIG_CPU_S5P6450)	+= clock-s5p6450.o

obj-$(CONFIG_PM)		+= pm.o irq-pm.o



# machine support

arch/arm/mach-s5p64x0/include/mach/map.h

+1 −0
Original line number Diff line number Diff line
@@ -88,5 +88,6 @@ 
#define S5P_PA_UART5		S5P6450_PA_UART(5)



#define S5P_SZ_UART		SZ_256

#define S3C_VA_UARTx(x)		(S3C_VA_UART + ((x) * S3C_UART_OFFSET))



#endif /* __ASM_ARCH_MAP_H */

arch/arm/mach-s5p64x0/include/mach/pm-core.h

0 → 100644
+117 −0
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/* linux/arch/arm/mach-s5p64x0/include/mach/pm-core.h

 *

 * Copyright (c) 2011 Samsung Electronics Co., Ltd.

 *		http://www.samsung.com

 *

 * S5P64X0 - PM core support for arch/arm/plat-samsung/pm.c

 *

 * Based on PM core support for S3C64XX by Ben Dooks

 *

 * 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 <mach/regs-gpio.h>



static inline void s3c_pm_debug_init_uart(void)

{

	u32 tmp = __raw_readl(S5P64X0_CLK_GATE_PCLK);



	/*

	 * As a note, since the S5P64X0 UARTs generally have multiple

	 * clock sources, we simply enable PCLK at the moment and hope

	 * that the resume settings for the UART are suitable for the

	 * use with PCLK.

	 */

	tmp |= S5P64X0_CLK_GATE_PCLK_UART0;

	tmp |= S5P64X0_CLK_GATE_PCLK_UART1;

	tmp |= S5P64X0_CLK_GATE_PCLK_UART2;

	tmp |= S5P64X0_CLK_GATE_PCLK_UART3;



	__raw_writel(tmp, S5P64X0_CLK_GATE_PCLK);

	udelay(10);

}



static inline void s3c_pm_arch_prepare_irqs(void)

{

	/* VIC should have already been taken care of */



	/* clear any pending EINT0 interrupts */

	__raw_writel(__raw_readl(S5P64X0_EINT0PEND), S5P64X0_EINT0PEND);

}



static inline void s3c_pm_arch_stop_clocks(void) { }

static inline void s3c_pm_arch_show_resume_irqs(void) { }



/*

 * make these defines, we currently do not have any need to change

 * the IRQ wake controls depending on the CPU we are running on

 */

#define s3c_irqwake_eintallow	((1 << 16) - 1)

#define s3c_irqwake_intallow	(~0)



static inline void s3c_pm_arch_update_uart(void __iomem *regs,

					struct pm_uart_save *save)

{

	u32 ucon = __raw_readl(regs + S3C2410_UCON);

	u32 ucon_clk = ucon & S3C6400_UCON_CLKMASK;

	u32 save_clk = save->ucon & S3C6400_UCON_CLKMASK;

	u32 new_ucon;

	u32 delta;



	/*

	 * S5P64X0 UART blocks only support level interrupts, so ensure that

	 * when we restore unused UART blocks we force the level interrupt

	 * settings.

	 */

	save->ucon |= S3C2410_UCON_TXILEVEL | S3C2410_UCON_RXILEVEL;



	/*

	 * We have a constraint on changing the clock type of the UART

	 * between UCLKx and PCLK, so ensure that when we restore UCON

	 * that the CLK field is correctly modified if the bootloader

	 * has changed anything.

	 */

	if (ucon_clk != save_clk) {

		new_ucon = save->ucon;

		delta = ucon_clk ^ save_clk;



		/*

		 * change from UCLKx => wrong PCLK,

		 * either UCLK can be tested for by a bit-test

		 * with UCLK0

		 */

		if (ucon_clk & S3C6400_UCON_UCLK0 &&

		!(save_clk & S3C6400_UCON_UCLK0) &&

		delta & S3C6400_UCON_PCLK2) {

			new_ucon &= ~S3C6400_UCON_UCLK0;

		} else if (delta == S3C6400_UCON_PCLK2) {

			/*

			 * as a precaution, don't change from

			 * PCLK2 => PCLK or vice-versa

			 */

			new_ucon ^= S3C6400_UCON_PCLK2;

		}



		S3C_PMDBG("ucon change %04x => %04x (save=%04x)\n",

			ucon, new_ucon, save->ucon);

		save->ucon = new_ucon;

	}

}



static inline void s3c_pm_restored_gpios(void)

{

	/* ensure sleep mode has been cleared from the system */

	__raw_writel(0, S5P64X0_SLPEN);

}



static inline void samsung_pm_saved_gpios(void)

{

	/*

	 * turn on the sleep mode and keep it there, as it seems that during

	 * suspend the xCON registers get re-set and thus you can end up with

	 * problems between going to sleep and resuming.

	 */

	__raw_writel(S5P64X0_SLPEN_USE_xSLP, S5P64X0_SLPEN);

}