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authorAkshay Saraswat <akshay.s@samsung.com>2015-02-04 16:00:05 +0530
committerMinkyu Kang <mk7.kang@samsung.com>2015-02-13 17:23:06 +0900
commit2e82e9252695a612ab0cbf40fa0c7368515f6506 (patch)
treef8fa04405338a19bfcd2aa1efb494a25649267cb /arch/arm
parentc5d32170bb98032781be0537ce56159fa52ade97 (diff)
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Exynos: Clock: Cleanup soc_get_periph_rate
Since we have src, div and pre-div mask bits defined corresponding to peripherals, calculation of clock specific to I2C appears redundant and confusing. Using clk_bit_info struct we can write calculations generic to all peripherals which makes code easy to understand and free from peripheral specific exceptions. Signed-off-by: Akshay Saraswat <akshay.s@samsung.com> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/cpu/armv7/exynos/clock.c74
1 files changed, 35 insertions, 39 deletions
diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c
index 83e5b18..c6455c2 100644
--- a/arch/arm/cpu/armv7/exynos/clock.c
+++ b/arch/arm/cpu/armv7/exynos/clock.c
@@ -366,8 +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();
@@ -389,30 +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:
@@ -422,12 +422,10 @@ static unsigned long exynos5_get_periph_rate(int peripheral)
case PERIPH_ID_I2C5:
case PERIPH_ID_I2C6:
case PERIPH_ID_I2C7:
- sclk = exynos5_get_pll_clk(MPLL);
- sub_div = ((readl(&clk->div_top1) >> bit_info->div_bit)
- & bit_info->div_mask) + 1;
- div = ((readl(&clk->div_top0) >> bit_info->prediv_bit)
- & bit_info->prediv_mask) + 1;
- return (sclk / sub_div) / div;
+ src = EXYNOS_SRC_MPLL;
+ div = readl(&clk->div_top0);
+ sub_div = readl(&clk->div_top1);
+ break;
default:
debug("%s: invalid peripheral %d", __func__, peripheral);
return -1;
@@ -447,28 +445,28 @@ static unsigned long exynos5_get_periph_rate(int peripheral)
sclk = exynos5_get_pll_clk(VPLL);
break;
default:
+ debug("%s: EXYNOS_SRC %d not supported\n", __func__, src);
return 0;
}
- /* Ratio clock division for this peripheral */
- if (bit_info->div_bit >= 0) {
- sub_div = (div >> bit_info->div_bit) & bit_info->div_mask;
- 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) & bit_info->prediv_mask;
- 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;
+ /* Calculate and return required clock rate */
+ return (sclk / (div + 1)) / (sub_div + 1);
}
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 = 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();
@@ -516,10 +514,9 @@ static unsigned long exynos542x_get_periph_rate(int peripheral)
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)
- & bit_info->div_mask) + 1;
- return sclk / sub_div;
+ src = EXYNOS542X_SRC_MPLL;
+ div = readl(&clk->div_top1);
+ break;
default:
debug("%s: invalid peripheral %d", __func__, peripheral);
return -1;
@@ -542,22 +539,21 @@ static unsigned long exynos542x_get_periph_rate(int peripheral)
sclk = exynos542x_get_pll_clk(RPLL);
break;
default:
+ debug("%s: EXYNOS542X_SRC %d not supported", __func__, src);
return 0;
}
- /* Ratio clock division for this peripheral */
- if (bit_info->div_bit >= 0) {
+ /* Clock divider ratio for this peripheral */
+ if (bit_info->div_bit >= 0)
div = (div >> bit_info->div_bit) & bit_info->div_mask;
- sub_clk = sclk / (div + 1);
- }
- if (bit_info->prediv_bit >= 0) {
+ /* 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 / (sub_div + 1);
- }
+ & 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)