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From eff8924b57d21eadfe749e500617340b1a730c17 Mon Sep 17 00:00:00 2001
From: Schuyler Patton <spatton@ti.com>
Date: Thu, 30 Jun 2011 13:39:25 -0500
Subject: [PATCH 1/3] omap3_evm: Added function calls to set volts, speed on OMAP36xx parts
* evm.c
* Added setup calls to set voltage and speed
* Added calls in misc_init_r to twl4030_power_mpu_init and set_mpu_clock
functions. These set VDD1 to 1.35v and mpu clock to 1GHz respectively.
There is a check performed to make sure that this is only called on
omap36xx class parts.
* twl4030.c
* Added twl4030_power_mpu_init function to set VDD1 to 1.35 Volts
* This is done to allow omap36xx parts to run at 1GHz.
* clock.c
* Added set_mpu_clk function to allow u-boot to set the clock
rate.
* sys_proto.h
* Added the function prototype set_mpu_clock
* twl4030.h
* Added twl4030_power_mpu_init function prototype
Upstream-Status: Pending
Signed-off-by: Schuyler Patton <spatton@ti.com>
---
arch/arm/cpu/armv7/omap3/clock.c | 15 +++++++++++++++
arch/arm/include/asm/arch-omap3/sys_proto.h | 2 ++
board/ti/evm/evm.c | 5 +++++
drivers/power/twl4030.c | 12 ++++++++++++
include/twl4030.h | 3 +++
5 files changed, 37 insertions(+), 0 deletions(-)
diff --git a/arch/arm/cpu/armv7/omap3/clock.c b/arch/arm/cpu/armv7/omap3/clock.c
index 567817e..46a28a3 100644
--- a/arch/arm/cpu/armv7/omap3/clock.c
+++ b/arch/arm/cpu/armv7/omap3/clock.c
@@ -35,6 +35,21 @@
#include <command.h>
/******************************************************************************
+ * Setting the Clock speed
+ *
+ *****************************************************************************/
+void set_mpu_clk(int speed)
+{
+ struct prcm *prcm_base = (struct prcm *)PRCM_BASE;
+
+
+ /* Set M */
+ sr32(&prcm_base->clksel1_pll_mpu, 8, 11, speed);
+ /* lock mode */
+ sr32(&prcm_base->clken_pll_mpu, 0, 3, PLL_LOCK);
+}
+
+/******************************************************************************
* get_sys_clk_speed() - determine reference oscillator speed
* based on known 32kHz clock and gptimer.
*****************************************************************************/
diff --git a/arch/arm/include/asm/arch-omap3/sys_proto.h b/arch/arm/include/asm/arch-omap3/sys_proto.h
index 2a89e56..9db13d7 100644
--- a/arch/arm/include/asm/arch-omap3/sys_proto.h
+++ b/arch/arm/include/asm/arch-omap3/sys_proto.h
@@ -36,6 +36,8 @@ void prcm_init(void);
void per_clocks_enable(void);
void ehci_clocks_enable(void);
+void set_mpu_clk(int speed);
+
void memif_init(void);
void sdrc_init(void);
void do_sdrc_init(u32, u32);
diff --git a/board/ti/evm/evm.c b/board/ti/evm/evm.c
index 8497aee..91eb93d 100644
--- a/board/ti/evm/evm.c
+++ b/board/ti/evm/evm.c
@@ -39,6 +39,7 @@
#include <asm/mach-types.h>
#include <linux/mtd/nand.h>
#include "evm.h"
+#include <twl4030.h>
#define OMAP3EVM_GPIO_ETH_RST_GEN1 64
#define OMAP3EVM_GPIO_ETH_RST_GEN2 7
@@ -177,6 +178,10 @@ int misc_init_r(void)
#endif
dieid_num_r();
+ if (get_cpu_family() == CPU_OMAP36XX) {
+ twl4030_power_mpu_init();
+ set_mpu_clk(500);
+ }
return 0;
}
diff --git a/drivers/power/twl4030.c b/drivers/power/twl4030.c
index 36b2144..670b4cb 100644
--- a/drivers/power/twl4030.c
+++ b/drivers/power/twl4030.c
@@ -105,6 +105,18 @@ void twl4030_power_init(void)
TWL4030_PM_RECEIVER_DEV_GRP_P1);
}
+#define VDD1_VSEL_135 0x3C
+
+void twl4030_power_mpu_init(void)
+{
+ unsigned char byte;
+
+ /* 1.4 Volts */
+ byte = VDD1_VSEL_135;
+ twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, byte,
+ TWL4030_PM_RECEIVER_VDD1_VSEL);
+}
+
void twl4030_power_mmc_init(void)
{
/* Set VMMC1 to 3.15 Volts */
diff --git a/include/twl4030.h b/include/twl4030.h
index 9cd32ab..91d36b8 100644
--- a/include/twl4030.h
+++ b/include/twl4030.h
@@ -510,6 +510,9 @@ static inline int twl4030_i2c_read_u8(u8 chip_no, u8 *val, u8 reg)
* Power
*/
+/*For setting VDD1 */
+void twl4030_power_mpu_init(void);
+
/* For hardware resetting */
void twl4030_power_reset_init(void);
/* For setting device group and voltage */
--
1.7.0.4
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