[U-Boot] [PATCH v4 6/6] Exynos: clock: change mask bits as per peripheral
Joonyoung Shim
jy0922.shim at samsung.com
Tue Feb 3 06:23:37 CET 2015
Hi,
On 02/02/2015 09:19 PM, Akshay Saraswat wrote:
> We have assumed and kept mask bits for divider and pre-divider
> as 0xf and 0xff, respectively. But these mask bits change from
> one peripheral to another, and hence, need to be specified in
> accordance with the peripherals.
>
> Signed-off-by: Akshay Saraswat <akshay.s at samsung.com>
> ---
> Changes since v3:
> - New patch.
>
> arch/arm/cpu/armv7/exynos/clock.c | 268 +++++++++++++++++++-------------------
> 1 file changed, 135 insertions(+), 133 deletions(-)
>
> diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c
> index f19fb5c..4feb5ba 100644
> --- a/arch/arm/cpu/armv7/exynos/clock.c
> +++ b/arch/arm/cpu/armv7/exynos/clock.c
> @@ -21,79 +21,83 @@
> */
> struct clk_bit_info {
> enum periph_id id;
> + int32_t src_mask;
> + int32_t div_mask;
> + int32_t prediv_mask;
> int8_t src_bit;
> int8_t div_bit;
> int8_t prediv_bit;
> };
>
> -/* periph_id src_bit div_bit prediv_bit */
> 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},
> - {PERIPH_ID_UART3, 12, 12, -1},
> - {PERIPH_ID_I2C0, -1, 24, 0},
> - {PERIPH_ID_I2C1, -1, 24, 0},
> - {PERIPH_ID_I2C2, -1, 24, 0},
> - {PERIPH_ID_I2C3, -1, 24, 0},
> - {PERIPH_ID_I2C4, -1, 24, 0},
> - {PERIPH_ID_I2C5, -1, 24, 0},
> - {PERIPH_ID_I2C6, -1, 24, 0},
> - {PERIPH_ID_I2C7, -1, 24, 0},
> - {PERIPH_ID_SPI0, 16, 0, 8},
> - {PERIPH_ID_SPI1, 20, 16, 24},
> - {PERIPH_ID_SPI2, 24, 0, 8},
> - {PERIPH_ID_SDMMC0, 0, 0, 8},
> - {PERIPH_ID_SDMMC1, 4, 16, 24},
> - {PERIPH_ID_SDMMC2, 8, 0, 8},
> - {PERIPH_ID_SDMMC3, 12, 16, 24},
> - {PERIPH_ID_I2S0, 0, 0, 4},
> - {PERIPH_ID_I2S1, 4, 12, 16},
> - {PERIPH_ID_SPI3, 0, 0, 4},
> - {PERIPH_ID_SPI4, 4, 12, 16},
> - {PERIPH_ID_SDMMC4, 16, 0, 8},
> - {PERIPH_ID_PWM0, 24, 0, -1},
> - {PERIPH_ID_PWM1, 24, 0, -1},
> - {PERIPH_ID_PWM2, 24, 0, -1},
> - {PERIPH_ID_PWM3, 24, 0, -1},
> - {PERIPH_ID_PWM4, 24, 0, -1},
> -
> - {PERIPH_ID_NONE, -1, -1, -1},
> + /* periph id s_mask d_mask p_mask s_bit d_bit p_bit */
> + {PERIPH_ID_UART0, 0xf, 0xf, -1, 0, 0, -1},
> + {PERIPH_ID_UART1, 0xf, 0xf, -1, 4, 4, -1},
> + {PERIPH_ID_UART2, 0xf, 0xf, -1, 8, 8, -1},
> + {PERIPH_ID_UART3, 0xf, 0xf, -1, 12, 12, -1},
> + {PERIPH_ID_I2C0, -1, 0x7, 0x7, -1, 24, 0},
> + {PERIPH_ID_I2C1, -1, 0x7, 0x7, -1, 24, 0},
> + {PERIPH_ID_I2C2, -1, 0x7, 0x7, -1, 24, 0},
> + {PERIPH_ID_I2C3, -1, 0x7, 0x7, -1, 24, 0},
> + {PERIPH_ID_I2C4, -1, 0x7, 0x7, -1, 24, 0},
> + {PERIPH_ID_I2C5, -1, 0x7, 0x7, -1, 24, 0},
> + {PERIPH_ID_I2C6, -1, 0x7, 0x7, -1, 24, 0},
> + {PERIPH_ID_I2C7, -1, 0x7, 0x7, -1, 24, 0},
> + {PERIPH_ID_SPI0, 0xf, 0xf, 0xff, 16, 0, 8},
> + {PERIPH_ID_SPI1, 0xf, 0xf, 0xff, 20, 16, 24},
> + {PERIPH_ID_SPI2, 0xf, 0xf, 0xff, 24, 0, 8},
> + {PERIPH_ID_SDMMC0, 0xf, 0xf, 0xff, 0, 0, 8},
> + {PERIPH_ID_SDMMC1, 0xf, 0xf, 0xff, 4, 16, 24},
> + {PERIPH_ID_SDMMC2, 0xf, 0xf, 0xff, 8, 0, 8},
> + {PERIPH_ID_SDMMC3, 0xf, 0xf, 0xff, 12, 16, 24},
> + {PERIPH_ID_I2S0, 0xf, 0xf, 0xff, 0, 0, 4},
> + {PERIPH_ID_I2S1, 0xf, 0xf, 0xff, 4, 12, 16},
> + {PERIPH_ID_SPI3, 0xf, 0xf, 0xff, 0, 0, 4},
> + {PERIPH_ID_SPI4, 0xf, 0xf, 0xff, 4, 12, 16},
> + {PERIPH_ID_SDMMC4, 0xf, 0xf, 0xff, 16, 0, 8},
> + {PERIPH_ID_PWM0, 0xf, 0xf, -1, 24, 0, -1},
> + {PERIPH_ID_PWM1, 0xf, 0xf, -1, 24, 0, -1},
> + {PERIPH_ID_PWM2, 0xf, 0xf, -1, 24, 0, -1},
> + {PERIPH_ID_PWM3, 0xf, 0xf, -1, 24, 0, -1},
> + {PERIPH_ID_PWM4, 0xf, 0xf, -1, 24, 0, -1},
> +
> + {PERIPH_ID_NONE, -1, -1, -1, -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, 8, 0, -1},
> - {PERIPH_ID_SDMMC1, 12, 10, -1},
> - {PERIPH_ID_SDMMC2, 16, 20, -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_SPI3, 12, 16, 0},
> - {PERIPH_ID_SPI4, 16, 20, 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},
> + /* periph id s_mask d_mask p_mask s_bit d_bit p_bit */
> + {PERIPH_ID_UART0, 0xf, 0xf, -1, 4, 8, -1},
> + {PERIPH_ID_UART1, 0xf, 0xf, -1, 8, 12, -1},
> + {PERIPH_ID_UART2, 0xf, 0xf, -1, 12, 16, -1},
> + {PERIPH_ID_UART3, 0xf, 0xf, -1, 16, 20, -1},
> + {PERIPH_ID_I2C0, -1, 0x3f, -1, -1, 8, -1},
> + {PERIPH_ID_I2C1, -1, 0x3f, -1, -1, 8, -1},
> + {PERIPH_ID_I2C2, -1, 0x3f, -1, -1, 8, -1},
> + {PERIPH_ID_I2C3, -1, 0x3f, -1, -1, 8, -1},
> + {PERIPH_ID_I2C4, -1, 0x3f, -1, -1, 8, -1},
> + {PERIPH_ID_I2C5, -1, 0x3f, -1, -1, 8, -1},
> + {PERIPH_ID_I2C6, -1, 0x3f, -1, -1, 8, -1},
> + {PERIPH_ID_I2C7, -1, 0x3f, -1, -1, 8, -1},
> + {PERIPH_ID_SPI0, 0xf, 0xf, 0xff, 20, 20, 8},
> + {PERIPH_ID_SPI1, 0xf, 0xf, 0xff, 24, 24, 16},
> + {PERIPH_ID_SPI2, 0xf, 0xf, 0xff, 28, 28, 24},
> + {PERIPH_ID_SDMMC0, 0x7, 0x3ff, -1, 8, 0, -1},
> + {PERIPH_ID_SDMMC1, 0x7, 0x3ff, -1, 12, 10, -1},
> + {PERIPH_ID_SDMMC2, 0x7, 0x3ff, -1, 16, 20, -1},
> + {PERIPH_ID_I2C8, -1, 0x3f, -1, -1, 8, -1},
> + {PERIPH_ID_I2C9, -1, 0x3f, -1, -1, 8, -1},
> + {PERIPH_ID_I2S0, 0xf, 0xf, 0xff, 0, 0, 4},
> + {PERIPH_ID_I2S1, 0xf, 0xf, 0xff, 4, 12, 16},
> + {PERIPH_ID_SPI3, 0xf, 0xf, 0xff, 12, 16, 0},
> + {PERIPH_ID_SPI4, 0xf, 0xf, 0xff, 16, 20, 8},
> + {PERIPH_ID_PWM0, 0xf, 0xf, -1, 24, 28, -1},
> + {PERIPH_ID_PWM1, 0xf, 0xf, -1, 24, 28, -1},
> + {PERIPH_ID_PWM2, 0xf, 0xf, -1, 24, 28, -1},
> + {PERIPH_ID_PWM3, 0xf, 0xf, -1, 24, 28, -1},
> + {PERIPH_ID_PWM4, 0xf, 0xf, -1, 24, 28, -1},
> + {PERIPH_ID_I2C10, -1, 0x3f, -1, -1, 8, -1},
> +
> + {PERIPH_ID_NONE, -1, -1, -1, -1, -1, -1},
> };
>
> /* Epll Clock division values to achive different frequency output */
> @@ -362,8 +366,8 @@ static struct clk_bit_info *get_clk_bit_info(int peripheral)
> static unsigned long exynos5_get_periph_rate(int peripheral)
> {
> struct clk_bit_info *bit_info = get_clk_bit_info(peripheral);
> - unsigned long sclk, sub_clk = 0;
> - unsigned int src, div, sub_div = 0;
> + unsigned long sclk = 0;
> + unsigned int src = 0, div = 0, sub_div = 0;
> struct exynos5_clock *clk =
> (struct exynos5_clock *)samsung_get_base_clock();
>
> @@ -385,30 +389,30 @@ static unsigned long exynos5_get_periph_rate(int peripheral)
> break;
> case PERIPH_ID_I2S0:
> src = readl(&clk->src_mau);
> - div = readl(&clk->div_mau);
> + div = sub_div = readl(&clk->div_mau);
> case PERIPH_ID_SPI0:
> case PERIPH_ID_SPI1:
> src = readl(&clk->src_peric1);
> - div = readl(&clk->div_peric1);
> + div = sub_div = readl(&clk->div_peric1);
> break;
> case PERIPH_ID_SPI2:
> src = readl(&clk->src_peric1);
> - div = readl(&clk->div_peric2);
> + div = sub_div = readl(&clk->div_peric2);
> break;
> case PERIPH_ID_SPI3:
> case PERIPH_ID_SPI4:
> src = readl(&clk->sclk_src_isp);
> - div = readl(&clk->sclk_div_isp);
> + div = sub_div = readl(&clk->sclk_div_isp);
> break;
> case PERIPH_ID_SDMMC0:
> case PERIPH_ID_SDMMC1:
> src = readl(&clk->src_fsys);
> - div = readl(&clk->div_fsys1);
> + div = sub_div = readl(&clk->div_fsys1);
> break;
> case PERIPH_ID_SDMMC2:
> case PERIPH_ID_SDMMC3:
> src = readl(&clk->src_fsys);
> - div = readl(&clk->div_fsys2);
> + div = sub_div = readl(&clk->div_fsys2);
> break;
> case PERIPH_ID_I2C0:
> case PERIPH_ID_I2C1:
> @@ -419,52 +423,51 @@ static unsigned long exynos5_get_periph_rate(int peripheral)
> case PERIPH_ID_I2C6:
> case PERIPH_ID_I2C7:
> sclk = exynos5_get_pll_clk(MPLL);
> - sub_div = ((readl(&clk->div_top1) >> bit_info->div_bit)
> - & 0x7) + 1;
> - div = ((readl(&clk->div_top0) >> bit_info->prediv_bit)
> - & 0x7) + 1;
> - return (sclk / sub_div) / div;
> + div = readl(&clk->div_top0);
> + sub_div = readl(&clk->div_top1);
> + break;
This isn't associated with to consider mask bits.
> default:
> debug("%s: invalid peripheral %d", __func__, peripheral);
> return -1;
> };
>
> - if (bit_info->src_bit >= 0)
> - src = (src >> bit_info->src_bit) & 0xf;
> + /* Get src clock for this peripheral */
> + if (bit_info->src_bit >= 0) {
> + src = (src >> bit_info->src_bit) & bit_info->src_mask;
>
> - switch (src) {
> - case EXYNOS_SRC_MPLL:
> - sclk = exynos5_get_pll_clk(MPLL);
> - break;
> - case EXYNOS_SRC_EPLL:
> - sclk = exynos5_get_pll_clk(EPLL);
> - break;
> - case EXYNOS_SRC_VPLL:
> - sclk = exynos5_get_pll_clk(VPLL);
> - break;
> - default:
> - return 0;
> + switch (src) {
> + case EXYNOS_SRC_MPLL:
> + sclk = exynos5_get_pll_clk(MPLL);
> + break;
> + case EXYNOS_SRC_EPLL:
> + sclk = exynos5_get_pll_clk(EPLL);
> + break;
> + case EXYNOS_SRC_VPLL:
> + sclk = exynos5_get_pll_clk(VPLL);
> + break;
> + default:
> + return 0;
> + }
Ditto also to move in brace. Should go to patch4?
> }
>
> - /* Ratio clock division for this peripheral */
> - if (bit_info->div_bit >= 0) {
> - sub_div = (div >> bit_info->div_bit) & 0xf;
> - sub_clk = sclk / (sub_div + 1);
> - }
> + /* Clock divider ratio for this peripheral */
> + if (bit_info->div_bit >= 0)
> + div = (div >> bit_info->div_bit) & bit_info->div_mask;
>
> - if (bit_info->prediv_bit >= 0) {
> - div = (div >> bit_info->prediv_bit) & 0xff;
> - return sub_clk / (div + 1);
> - }
> + /* Clock pre-divider ratio for this peripheral */
> + if (bit_info->prediv_bit >= 0)
> + sub_div = (sub_div >> bit_info->prediv_bit)
> + & bit_info->prediv_mask;
>
> - return sub_clk;
As i said above, I think it's better to split changes to clean and
combine codes to get sub_clk.
> + /* Calculate and return required clock rate */
> + return (sclk / (div + 1)) / (sub_div + 1);
> }
>
> static unsigned long exynos542x_get_periph_rate(int peripheral)
Same comments with exynos5_get_periph_rate.
Thanks.
> {
> struct clk_bit_info *bit_info = get_clk_bit_info(peripheral);
> - unsigned long sclk, sub_clk = 0;
> - unsigned int src, div, sub_div = 0;
> + unsigned long sclk = 0;
> + unsigned int src = 0, div = 0, sub_div = 0;
> struct exynos5420_clock *clk =
> (struct exynos5420_clock *)samsung_get_base_clock();
>
> @@ -513,46 +516,45 @@ static unsigned long exynos542x_get_periph_rate(int peripheral)
> 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;
> + div = readl(&clk->div_top1);
> + break;
> default:
> debug("%s: invalid peripheral %d", __func__, peripheral);
> return -1;
> };
>
> - if (bit_info->src_bit >= 0)
> - src = (src >> bit_info->src_bit) & 0xf;
> + if (bit_info->src_bit >= 0) {
> + src = (src >> bit_info->src_bit) & bit_info->src_mask;
>
> - switch (src) {
> - case EXYNOS542X_SRC_MPLL:
> - sclk = exynos542x_get_pll_clk(MPLL);
> - break;
> - case EXYNOS542X_SRC_SPLL:
> - sclk = exynos542x_get_pll_clk(SPLL);
> - 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;
> + switch (src) {
> + case EXYNOS542X_SRC_MPLL:
> + sclk = exynos542x_get_pll_clk(MPLL);
> + break;
> + case EXYNOS542X_SRC_SPLL:
> + sclk = exynos542x_get_pll_clk(SPLL);
> + 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 */
> - if (bit_info->div_bit >= 0) {
> - div = (div >> bit_info->div_bit) & 0xf;
> - sub_clk = sclk / (div + 1);
> - }
> + /* Clock divider ratio for this peripheral */
> + if (bit_info->div_bit >= 0)
> + div = (div >> bit_info->div_bit) & bit_info->div_mask;
>
> - if (bit_info->prediv_bit >= 0) {
> - sub_div = (sub_div >> bit_info->prediv_bit) & 0xff;
> - return sub_clk / (sub_div + 1);
> - }
> + /* Clock pre-divider ratio for this peripheral */
> + if (bit_info->prediv_bit >= 0)
> + sub_div = (sub_div >> bit_info->prediv_bit)
> + & bit_info->prediv_mask;
>
> - return sub_clk;
> + /* Calculate and return required clock rate */
> + return (sclk / (div + 1)) / (sub_div + 1);
> }
>
> unsigned long clock_get_periph_rate(int peripheral)
>
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