#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/clk.h>
+#include <asm/arch/periph.h>
/* Epll Clock division values to achive different frequency output */
static struct set_epll_con_val exynos5_epll_div[] = {
return exynos_get_pll_clk(pllreg, r, k);
}
+/* exynos4x12: return pll clock frequency */
+static unsigned long exynos4x12_get_pll_clk(int pllreg)
+{
+ struct exynos4x12_clock *clk =
+ (struct exynos4x12_clock *)samsung_get_base_clock();
+ unsigned long r, k = 0;
+
+ switch (pllreg) {
+ case APLL:
+ r = readl(&clk->apll_con0);
+ break;
+ case MPLL:
+ r = readl(&clk->mpll_con0);
+ break;
+ case EPLL:
+ r = readl(&clk->epll_con0);
+ k = readl(&clk->epll_con1);
+ break;
+ case VPLL:
+ r = readl(&clk->vpll_con0);
+ k = readl(&clk->vpll_con1);
+ break;
+ default:
+ printf("Unsupported PLL (%d)\n", pllreg);
+ return 0;
+ }
+
+ return exynos_get_pll_clk(pllreg, r, k);
+}
+
/* exynos5: return pll clock frequency */
static unsigned long exynos5_get_pll_clk(int pllreg)
{
return armclk;
}
+/* exynos4x12: return ARM clock frequency */
+static unsigned long exynos4x12_get_arm_clk(void)
+{
+ struct exynos4x12_clock *clk =
+ (struct exynos4x12_clock *)samsung_get_base_clock();
+ unsigned long div;
+ unsigned long armclk;
+ unsigned int core_ratio;
+ unsigned int core2_ratio;
+
+ div = readl(&clk->div_cpu0);
+
+ /* CORE_RATIO: [2:0], CORE2_RATIO: [30:28] */
+ core_ratio = (div >> 0) & 0x7;
+ core2_ratio = (div >> 28) & 0x7;
+
+ armclk = get_pll_clk(APLL) / (core_ratio + 1);
+ armclk /= (core2_ratio + 1);
+
+ return armclk;
+}
+
/* exynos5: return ARM clock frequency */
static unsigned long exynos5_get_arm_clk(void)
{
return pclk;
}
+/* exynos4x12: return pwm clock frequency */
+static unsigned long exynos4x12_get_pwm_clk(void)
+{
+ unsigned long pclk, sclk;
+ unsigned int ratio;
+
+ sclk = get_pll_clk(MPLL);
+ ratio = 8;
+
+ pclk = sclk / (ratio + 1);
+
+ return pclk;
+}
+
/* exynos5: return pwm clock frequency */
static unsigned long exynos5_get_pwm_clk(void)
{
return uclk;
}
+/* exynos4x12: return uart clock frequency */
+static unsigned long exynos4x12_get_uart_clk(int dev_index)
+{
+ struct exynos4x12_clock *clk =
+ (struct exynos4x12_clock *)samsung_get_base_clock();
+ unsigned long uclk, sclk;
+ unsigned int sel;
+ unsigned int ratio;
+
+ /*
+ * CLK_SRC_PERIL0
+ * UART0_SEL [3:0]
+ * UART1_SEL [7:4]
+ * UART2_SEL [8:11]
+ * UART3_SEL [12:15]
+ * UART4_SEL [16:19]
+ */
+ sel = readl(&clk->src_peril0);
+ sel = (sel >> (dev_index << 2)) & 0xf;
+
+ if (sel == 0x6)
+ sclk = get_pll_clk(MPLL);
+ else if (sel == 0x7)
+ sclk = get_pll_clk(EPLL);
+ else if (sel == 0x8)
+ sclk = get_pll_clk(VPLL);
+ else
+ return 0;
+
+ /*
+ * CLK_DIV_PERIL0
+ * UART0_RATIO [3:0]
+ * UART1_RATIO [7:4]
+ * UART2_RATIO [8:11]
+ * UART3_RATIO [12:15]
+ * UART4_RATIO [16:19]
+ */
+ ratio = readl(&clk->div_peril0);
+ ratio = (ratio >> (dev_index << 2)) & 0xf;
+
+ uclk = sclk / (ratio + 1);
+
+ return uclk;
+}
+
/* exynos5: return uart clock frequency */
static unsigned long exynos5_get_uart_clk(int dev_index)
{
return uclk;
}
+static unsigned long exynos4_get_mmc_clk(int dev_index)
+{
+ struct exynos4_clock *clk =
+ (struct exynos4_clock *)samsung_get_base_clock();
+ unsigned long uclk, sclk;
+ unsigned int sel, ratio, pre_ratio;
+ int shift;
+
+ sel = readl(&clk->src_fsys);
+ sel = (sel >> (dev_index << 2)) & 0xf;
+
+ if (sel == 0x6)
+ sclk = get_pll_clk(MPLL);
+ else if (sel == 0x7)
+ sclk = get_pll_clk(EPLL);
+ else if (sel == 0x8)
+ sclk = get_pll_clk(VPLL);
+ else
+ return 0;
+
+ switch (dev_index) {
+ case 0:
+ case 1:
+ ratio = readl(&clk->div_fsys1);
+ pre_ratio = readl(&clk->div_fsys1);
+ break;
+ case 2:
+ case 3:
+ ratio = readl(&clk->div_fsys2);
+ pre_ratio = readl(&clk->div_fsys2);
+ break;
+ case 4:
+ ratio = readl(&clk->div_fsys3);
+ pre_ratio = readl(&clk->div_fsys3);
+ break;
+ default:
+ return 0;
+ }
+
+ if (dev_index == 1 || dev_index == 3)
+ shift = 16;
+
+ ratio = (ratio >> shift) & 0xf;
+ pre_ratio = (pre_ratio >> (shift + 8)) & 0xff;
+ uclk = (sclk / (ratio + 1)) / (pre_ratio + 1);
+
+ return uclk;
+}
+
+static unsigned long exynos5_get_mmc_clk(int dev_index)
+{
+ struct exynos5_clock *clk =
+ (struct exynos5_clock *)samsung_get_base_clock();
+ unsigned long uclk, sclk;
+ unsigned int sel, ratio, pre_ratio;
+ int shift;
+
+ sel = readl(&clk->src_fsys);
+ sel = (sel >> (dev_index << 2)) & 0xf;
+
+ if (sel == 0x6)
+ sclk = get_pll_clk(MPLL);
+ else if (sel == 0x7)
+ sclk = get_pll_clk(EPLL);
+ else if (sel == 0x8)
+ sclk = get_pll_clk(VPLL);
+ else
+ return 0;
+
+ switch (dev_index) {
+ case 0:
+ case 1:
+ ratio = readl(&clk->div_fsys1);
+ pre_ratio = readl(&clk->div_fsys1);
+ break;
+ case 2:
+ case 3:
+ ratio = readl(&clk->div_fsys2);
+ pre_ratio = readl(&clk->div_fsys2);
+ break;
+ default:
+ return 0;
+ }
+
+ if (dev_index == 1 || dev_index == 3)
+ shift = 16;
+
+ ratio = (ratio >> shift) & 0xf;
+ pre_ratio = (pre_ratio >> (shift + 8)) & 0xff;
+ uclk = (sclk / (ratio + 1)) / (pre_ratio + 1);
+
+ return uclk;
+}
+
/* exynos4: set the mmc clock */
static void exynos4_set_mmc_clk(int dev_index, unsigned int div)
{
unsigned int addr;
unsigned int val;
+ /*
+ * CLK_DIV_FSYS1
+ * MMC0_PRE_RATIO [15:8], MMC1_PRE_RATIO [31:24]
+ * CLK_DIV_FSYS2
+ * MMC2_PRE_RATIO [15:8], MMC3_PRE_RATIO [31:24]
+ * CLK_DIV_FSYS3
+ * MMC4_PRE_RATIO [15:8]
+ */
+ if (dev_index < 2) {
+ addr = (unsigned int)&clk->div_fsys1;
+ } else if (dev_index == 4) {
+ addr = (unsigned int)&clk->div_fsys3;
+ dev_index -= 4;
+ } else {
+ addr = (unsigned int)&clk->div_fsys2;
+ dev_index -= 2;
+ }
+
+ val = readl(addr);
+ val &= ~(0xff << ((dev_index << 4) + 8));
+ val |= (div & 0xff) << ((dev_index << 4) + 8);
+ writel(val, addr);
+}
+
+/* exynos4x12: set the mmc clock */
+static void exynos4x12_set_mmc_clk(int dev_index, unsigned int div)
+{
+ struct exynos4x12_clock *clk =
+ (struct exynos4x12_clock *)samsung_get_base_clock();
+ unsigned int addr;
+ unsigned int val;
+
/*
* CLK_DIV_FSYS1
* MMC0_PRE_RATIO [15:8], MMC1_PRE_RATIO [31:24]
*/
cfg = readl(&clk->src_disp1_0);
cfg &= ~(0xf);
- cfg |= 0x8;
+ cfg |= 0x6;
writel(cfg, &clk->src_disp1_0);
/*
return 0;
}
+/**
+ * Linearly searches for the most accurate main and fine stage clock scalars
+ * (divisors) for a specified target frequency and scalar bit sizes by checking
+ * all multiples of main_scalar_bits values. Will always return scalars up to or
+ * slower than target.
+ *
+ * @param main_scalar_bits Number of main scalar bits, must be > 0 and < 32
+ * @param fine_scalar_bits Number of fine scalar bits, must be > 0 and < 32
+ * @param input_freq Clock frequency to be scaled in Hz
+ * @param target_freq Desired clock frequency in Hz
+ * @param best_fine_scalar Pointer to store the fine stage divisor
+ *
+ * @return best_main_scalar Main scalar for desired frequency or -1 if none
+ * found
+ */
+static int clock_calc_best_scalar(unsigned int main_scaler_bits,
+ unsigned int fine_scalar_bits, unsigned int input_rate,
+ unsigned int target_rate, unsigned int *best_fine_scalar)
+{
+ int i;
+ int best_main_scalar = -1;
+ unsigned int best_error = target_rate;
+ const unsigned int cap = (1 << fine_scalar_bits) - 1;
+ const unsigned int loops = 1 << main_scaler_bits;
+
+ debug("Input Rate is %u, Target is %u, Cap is %u\n", input_rate,
+ target_rate, cap);
+
+ assert(best_fine_scalar != NULL);
+ assert(main_scaler_bits <= fine_scalar_bits);
+
+ *best_fine_scalar = 1;
+
+ if (input_rate == 0 || target_rate == 0)
+ return -1;
+
+ if (target_rate >= input_rate)
+ return 1;
+
+ for (i = 1; i <= loops; i++) {
+ const unsigned int effective_div = max(min(input_rate / i /
+ target_rate, cap), 1);
+ const unsigned int effective_rate = input_rate / i /
+ effective_div;
+ const int error = target_rate - effective_rate;
+
+ debug("%d|effdiv:%u, effrate:%u, error:%d\n", i, effective_div,
+ effective_rate, error);
+
+ if (error >= 0 && error <= best_error) {
+ best_error = error;
+ best_main_scalar = i;
+ *best_fine_scalar = effective_div;
+ }
+ }
+
+ return best_main_scalar;
+}
+
+static int exynos5_set_spi_clk(enum periph_id periph_id,
+ unsigned int rate)
+{
+ struct exynos5_clock *clk =
+ (struct exynos5_clock *)samsung_get_base_clock();
+ int main;
+ unsigned int fine;
+ unsigned shift, pre_shift;
+ unsigned mask = 0xff;
+ u32 *reg;
+
+ main = clock_calc_best_scalar(4, 8, 400000000, rate, &fine);
+ if (main < 0) {
+ debug("%s: Cannot set clock rate for periph %d",
+ __func__, periph_id);
+ return -1;
+ }
+ main = main - 1;
+ fine = fine - 1;
+
+ switch (periph_id) {
+ case PERIPH_ID_SPI0:
+ reg = &clk->div_peric1;
+ shift = 0;
+ pre_shift = 8;
+ break;
+ case PERIPH_ID_SPI1:
+ reg = &clk->div_peric1;
+ shift = 16;
+ pre_shift = 24;
+ break;
+ case PERIPH_ID_SPI2:
+ reg = &clk->div_peric2;
+ shift = 0;
+ pre_shift = 8;
+ break;
+ case PERIPH_ID_SPI3:
+ reg = &clk->sclk_div_isp;
+ shift = 0;
+ pre_shift = 4;
+ break;
+ case PERIPH_ID_SPI4:
+ reg = &clk->sclk_div_isp;
+ shift = 12;
+ pre_shift = 16;
+ break;
+ default:
+ debug("%s: Unsupported peripheral ID %d\n", __func__,
+ periph_id);
+ return -1;
+ }
+ clrsetbits_le32(reg, mask << shift, (main & mask) << shift);
+ clrsetbits_le32(reg, mask << pre_shift, (fine & mask) << pre_shift);
+
+ return 0;
+}
+
+static unsigned long exynos4_get_i2c_clk(void)
+{
+ struct exynos4_clock *clk =
+ (struct exynos4_clock *)samsung_get_base_clock();
+ unsigned long sclk, aclk_100;
+ unsigned int ratio;
+
+ sclk = get_pll_clk(APLL);
+
+ ratio = (readl(&clk->div_top)) >> 4;
+ ratio &= 0xf;
+ aclk_100 = sclk / (ratio + 1);
+ return aclk_100;
+}
+
unsigned long get_pll_clk(int pllreg)
{
if (cpu_is_exynos5())
return exynos5_get_pll_clk(pllreg);
- else
+ else {
+ if (proid_is_exynos4412())
+ return exynos4x12_get_pll_clk(pllreg);
return exynos4_get_pll_clk(pllreg);
+ }
}
unsigned long get_arm_clk(void)
{
if (cpu_is_exynos5())
return exynos5_get_arm_clk();
- else
+ else {
+ if (proid_is_exynos4412())
+ return exynos4x12_get_arm_clk();
return exynos4_get_arm_clk();
+ }
}
unsigned long get_i2c_clk(void)
{
if (cpu_is_exynos5()) {
return exynos5_get_i2c_clk();
+ } else if (cpu_is_exynos4()) {
+ return exynos4_get_i2c_clk();
} else {
debug("I2C clock is not set for this CPU\n");
return 0;
{
if (cpu_is_exynos5())
return exynos5_get_pwm_clk();
- else
+ else {
+ if (proid_is_exynos4412())
+ return exynos4x12_get_pwm_clk();
return exynos4_get_pwm_clk();
+ }
}
unsigned long get_uart_clk(int dev_index)
{
if (cpu_is_exynos5())
return exynos5_get_uart_clk(dev_index);
- else
+ else {
+ if (proid_is_exynos4412())
+ return exynos4x12_get_uart_clk(dev_index);
return exynos4_get_uart_clk(dev_index);
+ }
+}
+
+unsigned long get_mmc_clk(int dev_index)
+{
+ if (cpu_is_exynos5())
+ return exynos5_get_mmc_clk(dev_index);
+ else
+ return exynos4_get_mmc_clk(dev_index);
}
void set_mmc_clk(int dev_index, unsigned int div)
{
if (cpu_is_exynos5())
exynos5_set_mmc_clk(dev_index, div);
- else
+ else {
+ if (proid_is_exynos4412())
+ exynos4x12_set_mmc_clk(dev_index, div);
exynos4_set_mmc_clk(dev_index, div);
+ }
}
unsigned long get_lcd_clk(void)
exynos4_set_mipi_clk();
}
+int set_spi_clk(int periph_id, unsigned int rate)
+{
+ if (cpu_is_exynos5())
+ return exynos5_set_spi_clk(periph_id, rate);
+ else
+ return 0;
+}
+
int set_i2s_clk_prescaler(unsigned int src_frq, unsigned int dst_frq)
{
projects / u-boot / blobdiff