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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>
This commit is contained in:
Akshay Saraswat 2015-02-04 16:00:05 +05:30 committed by Minkyu Kang
parent c5d32170bb
commit 2e82e92526
1 changed files with 35 additions and 39 deletions
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74
arch/arm/cpu/armv7/exynos/clock.c
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@ -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)