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Commit 64f102b6 authored by Yong Shen's avatar Yong Shen Committed by Sascha Hauer
Browse files

cpufreq for freescale mx51 



Currently, only two operating points: 160Mhz and 800Mhz.
the operating points are tested on babbage 3.0

Signed-off-by: default avatarYong Shen <yong.shen@linaro.org>
Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
parent 71e2889d

arch/arm/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -1584,6 +1584,12 @@ if ARCH_HAS_CPUFREQ 


source "drivers/cpufreq/Kconfig"



config CPU_FREQ_IMX

	tristate "CPUfreq driver for i.MX CPUs"

	depends on ARCH_MXC && CPU_FREQ

	help

	  This enables the CPUfreq driver for i.MX CPUs.



config CPU_FREQ_SA1100

	bool

arch/arm/mach-mx5/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ config ARCH_MX51 
	select MXC_TZIC

	select ARCH_MXC_IOMUX_V3

	select ARCH_MXC_AUDMUX_V2

	select ARCH_HAS_CPUFREQ



comment "MX5 platforms:"

arch/arm/mach-mx5/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
# Object file lists.

obj-y   := cpu.o mm.o clock-mx51.o devices.o



obj-$(CONFIG_CPU_FREQ_IMX)    += cpu_op-mx51.o

obj-$(CONFIG_MACH_MX51_BABBAGE) += board-mx51_babbage.o

obj-$(CONFIG_MACH_MX51_3DS) += board-mx51_3ds.o

obj-$(CONFIG_MACH_EUKREA_CPUIMX51) += board-cpuimx51.o

arch/arm/mach-mx5/board-mx51_babbage.c

+5 −1
Original line number Diff line number Diff line 
/*

 * Copyright 2009 Freescale Semiconductor, Inc. All Rights Reserved.

 * Copyright 2009-2010 Freescale Semiconductor, Inc. All Rights Reserved.

 * Copyright (C) 2009-2010 Amit Kucheria <amit.kucheria@canonical.com>

 *

 * The code contained herein is licensed under the GNU General Public
@@ -32,6 +32,7 @@ 


#include "devices-imx51.h"

#include "devices.h"

#include "cpu_op-mx51.h"



#define BABBAGE_USB_HUB_RESET	(0*32 + 7)	/* GPIO_1_7 */

#define BABBAGE_USBH1_STP	(0*32 + 27)	/* GPIO_1_27 */
@@ -298,6 +299,9 @@ static void __init mxc_board_init(void) 
{

	struct pad_desc usbh1stp = MX51_PAD_USBH1_STP__USBH1_STP;



#if defined(CONFIG_CPU_FREQ_IMX)

	get_cpu_op = mx51_get_cpu_op;

#endif

	mxc_iomux_v3_setup_multiple_pads(mx51babbage_pads,

					ARRAY_SIZE(mx51babbage_pads));

	mxc_init_imx_uart();

arch/arm/mach-mx5/clock-mx51.c

+20 −2
Original line number Diff line number Diff line
@@ -362,7 +362,7 @@ static int _clk_lp_apm_set_parent(struct clk *clk, struct clk *parent) 
	return 0;

}



static unsigned long clk_arm_get_rate(struct clk *clk)

static unsigned long clk_cpu_get_rate(struct clk *clk)

{

	u32 cacrr, div;

	unsigned long parent_rate;
@@ -374,6 +374,22 @@ static unsigned long clk_arm_get_rate(struct clk *clk) 
	return parent_rate / div;

}



static int clk_cpu_set_rate(struct clk *clk, unsigned long rate)

{

	u32 reg, cpu_podf;

	unsigned long parent_rate;



	parent_rate = clk_get_rate(clk->parent);

	cpu_podf = parent_rate / rate - 1;

	/* use post divider to change freq */

	reg = __raw_readl(MXC_CCM_CACRR);

	reg &= ~MXC_CCM_CACRR_ARM_PODF_MASK;

	reg |= cpu_podf << MXC_CCM_CACRR_ARM_PODF_OFFSET;

	__raw_writel(reg, MXC_CCM_CACRR);



	return 0;

}



static int _clk_periph_apm_set_parent(struct clk *clk, struct clk *parent)

{

	u32 reg, mux;
@@ -736,7 +752,8 @@ static struct clk periph_apm_clk = { 


static struct clk cpu_clk = {

	.parent = &pll1_sw_clk,

	.get_rate = clk_arm_get_rate,

	.get_rate = clk_cpu_get_rate,

	.set_rate = clk_cpu_set_rate,

};



static struct clk ahb_clk = {
@@ -1064,6 +1081,7 @@ static struct clk_lookup lookups[] = { 
	_REGISTER_CLOCK("imx51-cspi.0", NULL, cspi_clk)

	_REGISTER_CLOCK("sdhci-esdhc-imx.0", NULL, esdhc1_clk)

	_REGISTER_CLOCK("sdhci-esdhc-imx.1", NULL, esdhc2_clk)

	_REGISTER_CLOCK(NULL, "cpu_clk", cpu_clk)

};



static void clk_tree_init(void)