[U-Boot] [beagleboard] TI:OMAP: [PATCH 3/4] Support 720Mhz configuration for OMAP35xx
Nishanth Menon
menon.nishanth at gmail.com
Fri Jan 8 20:52:01 CET 2010
On Fri, Jan 8, 2010 at 9:40 AM, Khasim Syed Mohammed
<khasim at beagleboard.org> wrote:
>
> From bba669562fa208d12f4c7cd8188446e8576cd6ee Mon Sep 17 00:00:00 2001
> From: Syed Mohammed Khasim <khasim at ti.com>
> Date: Fri, 8 Jan 2010 20:34:37 +0530
> Subject: [PATCH] Support 720Mhz configuration for OMAP35xx
>
> Adds a new API "twl4030_pmrecv_vsel_cfg" to select voltage and group
> Adds support for 720Mhz in clock.c
> Board file modified to use these new APIs and boot at 720Mhz
Could you split this into three patches please? easier to track
changes at a later date.
a) introducing generic voltage setting API for twl
b) introduce 720mhz
c) beagle support for C4 with 720Mhz.
>
> Signed-off-by: Syed Mohammed Khasim <khasim at ti.com>
> ---
> board/ti/beagle/beagle.c | 20 ++++++++++++++++++--
> cpu/arm_cortexa8/omap3/clock.c | 21 +++++++++++++++++++++
> drivers/power/twl4030.c | 24 +++++++++++++++---------
> include/twl4030.h | 16 ++++++++++++++++
> 4 files changed, 70 insertions(+), 11 deletions(-)
>
> diff --git a/board/ti/beagle/beagle.c b/board/ti/beagle/beagle.c
> index 0def5a6..7985ee9 100644
> --- a/board/ti/beagle/beagle.c
> +++ b/board/ti/beagle/beagle.c
> @@ -122,9 +122,27 @@ int misc_init_r(void)
> struct gpio *gpio5_base = (struct gpio *)OMAP34XX_GPIO5_BASE;
> struct gpio *gpio6_base = (struct gpio *)OMAP34XX_GPIO6_BASE;
>
> + beagle_identify();
> +
> twl4030_power_init();
> twl4030_led_init();
>
> + if (beagle_revision == REVISION_C4) {
> +
> + /* Select TWL4030 VSEL to support 720Mhz */
> + twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VAUX2_DEDICATED,
> + VAUX2_VSEL_18,
> + TWL4030_PM_RECEIVER_VAUX2_DEV_GRP,
> + DEV_GRP_P1);
> +
> + twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VDD1_VSEL,
> + VDD1_VSEL_14,
> + TWL4030_PM_RECEIVER_VDD1_DEV_GRP,
> + DEV_GRP_P1);
> +
> + prcm_config_720mhz();
> + }
> +
> /* Configure GPIOs to output */
> writel(~(GPIO23 | GPIO10 | GPIO8 | GPIO2 | GPIO1), &gpio6_base->oe);
> writel(~(GPIO31 | GPIO30 | GPIO29 | GPIO28 | GPIO22 | GPIO21 |
> @@ -136,8 +154,6 @@ int misc_init_r(void)
> writel(GPIO31 | GPIO30 | GPIO29 | GPIO28 | GPIO22 | GPIO21 |
> GPIO15 | GPIO14 | GPIO13 | GPIO12, &gpio5_base->setdataout);
>
> - beagle_identify();
> -
> dieid_num_r();
>
> return 0;
> diff --git a/cpu/arm_cortexa8/omap3/clock.c b/cpu/arm_cortexa8/omap3/clock.c
> index 174c453..d67517a 100644
> --- a/cpu/arm_cortexa8/omap3/clock.c
> +++ b/cpu/arm_cortexa8/omap3/clock.c
> @@ -402,3 +402,24 @@ void per_clocks_enable(void)
>
> sdelay(1000);
> }
> +
> +/*
> + * Configure PRCM registers to get 720 Mhz
> + *
> + * NOTE: N value doesn't change, only M gets affected
> + */
> +void prcm_config_720mhz(void)
> +{
> + struct prcm *prcm_base = (struct prcm *)PRCM_BASE;
> +
> + /* Unlock MPU DPLL (slows things down, and needed later) */
> + sr32(&prcm_base->clken_pll_mpu, 0, 3, PLL_LOW_POWER_BYPASS);
> + wait_on_value(ST_MPU_CLK, 0, &prcm_base->idlest_pll_mpu, LDELAY);
> +
> + /* Set M */
> + sr32(&prcm_base->clksel1_pll_mpu, 8, 11, 0x2D0);
> +
> + /* lock mode */
> + sr32(&prcm_base->clken_pll_mpu, 0, 3, PLL_LOCK);
> + wait_on_value(ST_MPU_CLK, 1, &prcm_base->idlest_pll_mpu, LDELAY);
I know of dll lock infinite loops in some other system.. but that is a
different topic needing a different patch anyways.
> +}
> diff --git a/drivers/power/twl4030.c b/drivers/power/twl4030.c
> index eb066cb..d68e515 100644
> --- a/drivers/power/twl4030.c
> +++ b/drivers/power/twl4030.c
> @@ -59,16 +59,9 @@ void twl4030_power_reset_init(void)
> }
> }
>
> -
> /*
> * Power Init
> */
> -#define DEV_GRP_P1 0x20
> -#define VAUX3_VSEL_28 0x03
> -#define DEV_GRP_ALL 0xE0
> -#define VPLL2_VSEL_18 0x05
> -#define VDAC_VSEL_18 0x03
> -
> void twl4030_power_init(void)
> {
> unsigned char byte;
> @@ -98,8 +91,6 @@ void twl4030_power_init(void)
> TWL4030_PM_RECEIVER_VDAC_DEDICATED);
> }
>
> -#define VMMC1_VSEL_30 0x02
> -
> void twl4030_power_mmc_init(void)
> {
> unsigned char byte;
> @@ -113,3 +104,18 @@ void twl4030_power_mmc_init(void)
> twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, byte,
> TWL4030_PM_RECEIVER_VMMC1_DEDICATED);
> }
> +
> +/*
> + * Generic function to select Device Group and Voltage
> + */
> +void twl4030_pmrecv_vsel_cfg(u8 vsel_reg, u8 vsel_val,
> + u8 dev_grp, u8 dev_grp_sel)
> +{
> + /* Select the Device Group */
> + twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, dev_grp_sel,
> + dev_grp);
> +
> + /* Select the Voltage */
> + twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, vsel_val,
> + vsel_reg);
> +}
Assumption that i2c operations work 100% successfully! is'nt serial
bus subject to noise? and cant' i2c ops fail?
> diff --git a/include/twl4030.h b/include/twl4030.h
> index f260ecb..b96c96c 100644
> --- a/include/twl4030.h
> +++ b/include/twl4030.h
> @@ -359,6 +359,22 @@
> #define TWL4030_USB_PHY_DPLL_CLK (1 << 0)
>
> /*
> + * Voltage Selection in PM Receiver Module
> + */
> +#define VAUX2_VSEL_18 0x05
> +#define VDD1_VSEL_14 0x40
> +#define VAUX3_VSEL_28 0x03
> +#define VPLL2_VSEL_18 0x05
> +#define VDAC_VSEL_18 0x03
> +#define VMMC1_VSEL_30 0x02
> +
> +/*
> + * Device Selection
> + */
> +#define DEV_GRP_P1 0x20
> +#define DEV_GRP_ALL 0xE0
> +
> +/*
> * Convience functions to read and write from TWL4030
> *
> * chip_no is the i2c address, it must be one of the chip addresses
> --
> 1.5.6.3
we should try review again after you have split the series up.
Regards,
Nishanth Menon
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