95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/cpu.h>
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#include <asm/arch/clock.h>
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#ifdef CONFIG_SPL_BUILD
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void clock_init_safe(void)
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{
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struct sunxi_ccm_reg *const ccm =
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(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
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clock_set_pll1(408000000);
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writel(CCM_PLL6_DEFAULT, &ccm->pll6_cfg);
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while (!(readl(&ccm->pll6_cfg) & CCM_PLL6_LOCK))
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;
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clrsetbits_le32(&ccm->cpu_axi_cfg, CCM_CPU_AXI_APB_MASK | CCM_CPU_AXI_AXI_MASK,
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CCM_CPU_AXI_DEFAULT_FACTORS);
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writel(CCM_PSI_AHB1_AHB2_DEFAULT, &ccm->psi_ahb1_ahb2_cfg);
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writel(CCM_AHB3_DEFAULT, &ccm->ahb3_cfg);
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writel(CCM_APB1_DEFAULT, &ccm->apb1_cfg);
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/*
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* The mux and factor are set, but the clock will be enabled in
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* DRAM initialization code.
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*/
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writel(MBUS_CLK_SRC_PLL6X2 | MBUS_CLK_M(3), &ccm->mbus_cfg);
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}
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#endif
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void clock_init_uart(void)
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{
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struct sunxi_ccm_reg *const ccm =
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(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
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/* uart clock source is apb2 */
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writel(APB2_CLK_SRC_OSC24M|
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APB2_CLK_RATE_N_1|
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APB2_CLK_RATE_M(1),
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&ccm->apb2_cfg);
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/* open the clock for uart */
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setbits_le32(&ccm->uart_gate_reset,
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1 << (CONFIG_CONS_INDEX - 1));
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/* deassert uart reset */
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setbits_le32(&ccm->uart_gate_reset,
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1 << (RESET_SHIFT + CONFIG_CONS_INDEX - 1));
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}
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#ifdef CONFIG_SPL_BUILD
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void clock_set_pll1(unsigned int clk)
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{
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struct sunxi_ccm_reg * const ccm =
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(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
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u32 val;
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/* Do not support clocks < 288MHz as they need factor P */
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if (clk < 288000000) clk = 288000000;
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/* Switch to 24MHz clock while changing PLL1 */
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val = readl(&ccm->cpu_axi_cfg);
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val &= ~CCM_CPU_AXI_MUX_MASK;
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val |= CCM_CPU_AXI_MUX_OSC24M;
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writel(val, &ccm->cpu_axi_cfg);
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/* clk = 24*n/p, p is ignored if clock is >288MHz */
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writel(CCM_PLL1_CTRL_EN | CCM_PLL1_LOCK_EN | CCM_PLL1_CLOCK_TIME_2 |
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CCM_PLL1_CTRL_N(clk / 24000000), &ccm->pll1_cfg);
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while (!(readl(&ccm->pll1_cfg) & CCM_PLL1_LOCK)) {}
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/* Switch CPU to PLL1 */
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val = readl(&ccm->cpu_axi_cfg);
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val &= ~CCM_CPU_AXI_MUX_MASK;
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val |= CCM_CPU_AXI_MUX_PLL_CPUX;
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writel(val, &ccm->cpu_axi_cfg);
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}
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#endif
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unsigned int clock_get_pll6(void)
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{
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struct sunxi_ccm_reg *const ccm =
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(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
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uint32_t rval = readl(&ccm->pll6_cfg);
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int n = ((rval & CCM_PLL6_CTRL_N_MASK) >> CCM_PLL6_CTRL_N_SHIFT);
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int div1 = ((rval & CCM_PLL6_CTRL_DIV1_MASK) >>
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CCM_PLL6_CTRL_DIV1_SHIFT) + 1;
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int div2 = ((rval & CCM_PLL6_CTRL_DIV2_MASK) >>
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CCM_PLL6_CTRL_DIV2_SHIFT) + 1;
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/* The register defines PLL6-4X, not plain PLL6 */
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return 24000000 / 4 * n / div1 / div2;
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}
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