[U-Boot] [PATCH v3 3/6] Exynos542x: Add and enable get_periph_rate support
Akshay Saraswat
akshay.s at samsung.com
Fri Jan 16 06:48:17 CET 2015
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 v2:
- Fixed enum and exynos542x_get_periph_rate switch.
- Added checks for negative values in exynos542x_get_periph_rate.
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 | 3 +
2 files changed, 147 insertions(+), 7 deletions(-)
diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c
index 5dc9ed2..ee6c13b 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},
@@ -61,6 +61,42 @@ 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_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_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 },
@@ -306,16 +342,22 @@ 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;
}
- if (clk_bit_info[i].id == PERIPH_ID_NONE)
+ if (info[i].id == PERIPH_ID_NONE)
debug("ERROR: Peripheral ID %d not found\n", peripheral);
- return &clk_bit_info[i];
+ return &info[i];
}
static unsigned long exynos5_get_periph_rate(int peripheral)
@@ -414,12 +456,107 @@ 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 = 0;
+ 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:
+ 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;
+ 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;
+ };
+
+ if (bit_info->src_bit >= 0)
+ 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 */
+ if (bit_info->div_bit >= 0) {
+ 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..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);
--
1.9.1
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