[U-Boot] [PATCH v2 3/6] Exynos542x: Add and enable get_periph_rate support
Joonyoung Shim
jy0922.shim at samsung.com
Fri Jan 16 05:58:33 CET 2015
Hi,
On 01/15/2015 10:31 PM, Akshay Saraswat wrote:
> We planned to fetch peripheral rate through one generic API per
> peripheral. These generic peripheral functions are in turn
> expected to fetch apt values from a function refactored as
> per SoC versions. This patch adds support for fetching peripheral
> rates for Exynos5420 and Exynos5800.
>
> Signed-off-by: Akshay Saraswat <akshay.s at samsung.com>
> ---
> Changes since v1:
> - Changes suuport -> support in commit message.
> - Removed position change of exynos5420_get_pll_clk.
> - Removed #ifdef.
>
> arch/arm/cpu/armv7/exynos/clock.c | 151 +++++++++++++++++++++++++++++++--
> arch/arm/include/asm/arch-exynos/clk.h | 5 +-
> 2 files changed, 148 insertions(+), 8 deletions(-)
>
> diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c
> index 6a1b05f..1ef4f49 100644
> --- a/arch/arm/cpu/armv7/exynos/clock.c
> +++ b/arch/arm/cpu/armv7/exynos/clock.c
> @@ -27,7 +27,7 @@ struct clk_bit_info {
> };
>
> /* periph_id src_bit div_bit prediv_bit */
> -static struct clk_bit_info clk_bit_info[] = {
> +static struct clk_bit_info exynos5_bit_info[] = {
> {PERIPH_ID_UART0, 0, 0, -1},
> {PERIPH_ID_UART1, 4, 4, -1},
> {PERIPH_ID_UART2, 8, 8, -1},
> @@ -65,6 +65,44 @@ static struct clk_bit_info clk_bit_info[] = {
> {PERIPH_ID_NONE, -1, -1, -1},
> };
>
> +static struct clk_bit_info exynos542x_bit_info[] = {
> + {PERIPH_ID_UART0, 4, 8, -1},
> + {PERIPH_ID_UART1, 8, 12, -1},
> + {PERIPH_ID_UART2, 12, 16, -1},
> + {PERIPH_ID_UART3, 16, 20, -1},
> + {PERIPH_ID_I2C0, -1, 8, -1},
> + {PERIPH_ID_I2C1, -1, 8, -1},
> + {PERIPH_ID_I2C2, -1, 8, -1},
> + {PERIPH_ID_I2C3, -1, 8, -1},
> + {PERIPH_ID_I2C4, -1, 8, -1},
> + {PERIPH_ID_I2C5, -1, 8, -1},
> + {PERIPH_ID_I2C6, -1, 8, -1},
> + {PERIPH_ID_I2C7, -1, 8, -1},
> + {PERIPH_ID_SPI0, 20, 20, 8},
> + {PERIPH_ID_SPI1, 24, 24, 16},
> + {PERIPH_ID_SPI2, 28, 28, 24},
> + {PERIPH_ID_SDMMC0, 0, 0, -1},
> + {PERIPH_ID_SDMMC1, 4, 10, -1},
> + {PERIPH_ID_SDMMC2, 8, 20, -1},
> + {PERIPH_ID_SDMMC3, -1, -1, -1},
> + {PERIPH_ID_I2C8, -1, 8, -1},
> + {PERIPH_ID_I2C9, -1, 8, -1},
> + {PERIPH_ID_I2S0, 0, 0, 4},
> + {PERIPH_ID_I2S1, 4, 12, 16},
> + {PERIPH_ID_SROMC, -1, -1, -1},
> + {PERIPH_ID_SPI3, 12, 16, 0},
> + {PERIPH_ID_SPI4, 16, 20, 8},
> + {PERIPH_ID_SDMMC4, 16, 0, 8},
> + {PERIPH_ID_PWM0, 24, 28, -1},
> + {PERIPH_ID_PWM1, 24, 28, -1},
> + {PERIPH_ID_PWM2, 24, 28, -1},
> + {PERIPH_ID_PWM3, 24, 28, -1},
> + {PERIPH_ID_PWM4, 24, 28, -1},
> + {PERIPH_ID_I2C10, -1, 8, -1},
> +
> + {PERIPH_ID_NONE, -1, -1, -1},
> +};
> +
> /* Epll Clock division values to achive different frequency output */
> static struct set_epll_con_val exynos5_epll_div[] = {
> { 192000000, 0, 48, 3, 1, 0 },
> @@ -310,13 +348,19 @@ static unsigned long exynos542x_get_pll_clk(int pllreg)
> static struct clk_bit_info *get_clk_bit_info(int peripheral)
> {
> int i;
> + struct clk_bit_info *info;
>
> - for (i = 0; clk_bit_info[i].id != PERIPH_ID_NONE; i++) {
> - if (clk_bit_info[i].id == peripheral)
> + if (proid_is_exynos5420() || proid_is_exynos5800())
> + info = exynos542x_bit_info;
> + else
> + info = exynos5_bit_info;
> +
> + for (i = 0; info[i].id != PERIPH_ID_NONE; i++) {
> + if (info[i].id == peripheral)
> break;
> }
>
> - return &clk_bit_info[i];
> + return &info[i];
> }
>
> static unsigned long exynos5_get_periph_rate(int peripheral)
> @@ -415,12 +459,107 @@ static unsigned long exynos5_get_periph_rate(int peripheral)
> return sub_clk;
> }
>
> +static unsigned long exynos542x_get_periph_rate(int peripheral)
> +{
> + struct clk_bit_info *bit_info = get_clk_bit_info(peripheral);
> + unsigned long sclk, sub_clk;
> + unsigned int src, div, sub_div = 0;
> + struct exynos5420_clock *clk =
> + (struct exynos5420_clock *)samsung_get_base_clock();
> +
> + switch (peripheral) {
> + case PERIPH_ID_UART0:
> + case PERIPH_ID_UART1:
> + case PERIPH_ID_UART2:
> + case PERIPH_ID_UART3:
> + src = readl(&clk->src_peric0);
> + div = readl(&clk->div_peric0);
> + break;
> + case PERIPH_ID_PWM0:
> + case PERIPH_ID_PWM1:
> + case PERIPH_ID_PWM2:
> + case PERIPH_ID_PWM3:
> + case PERIPH_ID_PWM4:
> + src = readl(&clk->src_peric0);
> + div = readl(&clk->div_peric0);
> + break;
UARTx and PWMx use same register, so you can remove duplicated codes.
> + case PERIPH_ID_SPI0:
> + case PERIPH_ID_SPI1:
> + case PERIPH_ID_SPI2:
> + src = readl(&clk->src_peric1);
> + div = readl(&clk->div_peric1);
> + sub_div = readl(&clk->div_peric4);
> + break;
> + case PERIPH_ID_SPI3:
> + case PERIPH_ID_SPI4:
> + src = readl(&clk->src_isp);
> + div = readl(&clk->div_isp1);
> + sub_div = readl(&clk->div_isp1);
> + break;
> + case PERIPH_ID_SDMMC0:
> + case PERIPH_ID_SDMMC1:
> + case PERIPH_ID_SDMMC2:
> + case PERIPH_ID_SDMMC3:
> + src = readl(&clk->src_fsys);
> + div = readl(&clk->div_fsys1);
> + break;
> + case PERIPH_ID_I2C0:
> + case PERIPH_ID_I2C1:
> + case PERIPH_ID_I2C2:
> + case PERIPH_ID_I2C3:
> + case PERIPH_ID_I2C4:
> + case PERIPH_ID_I2C5:
> + case PERIPH_ID_I2C6:
> + case PERIPH_ID_I2C7:
> + case PERIPH_ID_I2C8:
> + case PERIPH_ID_I2C9:
> + case PERIPH_ID_I2C10:
> + sclk = exynos542x_get_pll_clk(MPLL);
> + sub_div = ((readl(&clk->div_top1) >> bit_info->div_bit)
> + & 0x7) + 1;
> + return sclk / sub_div;
> + default:
> + debug("%s: invalid peripheral %d", __func__, peripheral);
> + return -1;
> + };
> +
> + src = (src >> bit_info->src_bit) & 0xf;
> +
> + switch (src) {
> + case EXYNOS542x_SRC_MPLL:
> + sclk = exynos542x_get_pll_clk(MPLL);
> + break;
> + case EXYNOS542x_SRC_EPLL:
> + sclk = exynos542x_get_pll_clk(EPLL);
> + break;
> + case EXYNOS542x_SRC_RPLL:
> + sclk = exynos542x_get_pll_clk(RPLL);
> + break;
> + default:
> + return 0;
> + }
> +
> + /* Ratio clock division for this peripheral */
> + div = (div >> bit_info->div_bit) & 0xf;
> + sub_clk = sclk / (div + 1);
> +
> + if (bit_info->prediv_bit >= 0) {
> + sub_div = (sub_div >> bit_info->prediv_bit) & 0xff;
> + return sub_clk / (sub_div + 1);
> + }
> +
> + return sub_clk;
> +}
> +
> unsigned long clock_get_periph_rate(int peripheral)
> {
> - if (cpu_is_exynos5())
> + if (cpu_is_exynos5()) {
> + if (proid_is_exynos5420() || proid_is_exynos5800())
> + return exynos542x_get_periph_rate(peripheral);
> return exynos5_get_periph_rate(peripheral);
> - else
> + } else {
> return 0;
> + }
> }
>
> /* exynos4: return ARM clock frequency */
> diff --git a/arch/arm/include/asm/arch-exynos/clk.h b/arch/arm/include/asm/arch-exynos/clk.h
> index db24dc0..606b3ef 100644
> --- a/arch/arm/include/asm/arch-exynos/clk.h
> +++ b/arch/arm/include/asm/arch-exynos/clk.h
> @@ -23,8 +23,9 @@
> #define SET_RATIO(x, y) ((y & 0xf) << (x << 4))
>
> enum pll_src_bit {
> - EXYNOS_SRC_MPLL = 6,
> - EXYNOS_SRC_EPLL,
> + EXYNOS542x_SRC_MPLL = 3,
> + EXYNOS_SRC_MPLL = EXYNOS542x_SRC_EPLL = 6,
> + EXYNOS_SRC_EPLL = EXYNOS542x_SRC_RPLL,
> EXYNOS_SRC_VPLL,
> };
Could you use one item by one line like below?
diff --git a/arch/arm/include/asm/arch-exynos/clk.h b/arch/arm/include/asm/arch-exynos/clk.h
index db24dc0..da9bfcd 100644
--- a/arch/arm/include/asm/arch-exynos/clk.h
+++ b/arch/arm/include/asm/arch-exynos/clk.h
@@ -26,6 +26,9 @@ enum pll_src_bit {
EXYNOS_SRC_MPLL = 6,
EXYNOS_SRC_EPLL,
EXYNOS_SRC_VPLL,
+ EXYNOS542x_SRC_MPLL = 3,
+ EXYNOS542x_SRC_EPLL = 6,
+ EXYNOS542x_SRC_RPLL,
};
unsigned long get_pll_clk(int pllreg);
Thanks.
More information about the U-Boot
mailing list