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https://github.com/u-boot/u-boot.git
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f542948b1e
Add basic clocks pll1, pll5, and some default values from allwinner u-boot. Signed-off-by: Vishnu Patekar <vishnupatekar0510@gmail.com> [hdegoede@redhat.com] Fix PLL6 init to run at 600 MHz instead of 288 MHz, fixing the mmc support not working [hdegoede@redhat.com] Fix PLL init code to properly wait for the PLL-s to stabilize, fixing cold-booting directly from sdcard not working Signed-off-by: Hans de Goede <hdegoede@redhat.com>
137 lines
3.7 KiB
C
137 lines
3.7 KiB
C
/*
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* A83 specific clock code
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*
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* (C) Copyright 2007-2012
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* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
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* Tom Cubie <tangliang@allwinnertech.com>
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*
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* (C) Copyright 2015 Vishnu Patekar <vishnupatekar0510@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/prcm.h>
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#include <asm/arch/sys_proto.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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/* enable pll_hsic, default is 480M */
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writel(PLL8_CFG_DEFAULT, &ccm->pll8_cfg);
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writel(readl(&ccm->pll8_cfg) | (0x1 << 31), &ccm->pll8_cfg);
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while (!(readl(&ccm->pll_stable_status) & (1 << 8))) {}
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/* switch to default 24MHz before changing to hsic */
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writel(0x0, &ccm->cci400_cfg);
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sdelay(50);
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writel(CCM_CCI400_CLK_SEL_HSIC, &ccm->cci400_cfg);
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sdelay(100);
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/* switch before changing pll6 */
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clrsetbits_le32(&ccm->ahb1_apb1_div, AHB1_CLK_SRC_MASK,
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AHB1_CLK_SRC_OSC24M);
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writel(PLL6_CFG_DEFAULT, &ccm->pll6_cfg);
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while (!(readl(&ccm->pll_stable_status) & (1 << 6))) {}
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writel(AHB1_ABP1_DIV_DEFAULT, &ccm->ahb1_apb1_div);
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writel(CCM_MBUS_RESET_RESET, &ccm->mbus_reset);
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writel(MBUS_CLK_DEFAULT, &ccm->mbus_clk_cfg);
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/* timestamp */
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writel(1, 0x01720000);
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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_div);
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/* open the clock for uart */
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setbits_le32(&ccm->apb2_gate,
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CLK_GATE_OPEN << (APB2_GATE_UART_SHIFT +
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CONFIG_CONS_INDEX - 1));
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/* deassert uart reset */
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setbits_le32(&ccm->apb2_reset_cfg,
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1 << (APB2_RESET_UART_SHIFT +
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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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const int p = 0;
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/* Switch to 24MHz clock while changing PLL1 */
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writel(AXI_DIV_2 << AXI0_DIV_SHIFT |
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AXI_DIV_2 << AXI1_DIV_SHIFT |
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CPU_CLK_SRC_OSC24M << C0_CPUX_CLK_SRC_SHIFT |
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CPU_CLK_SRC_OSC24M << C1_CPUX_CLK_SRC_SHIFT,
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&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_CTRL_P(p) | CMM_PLL1_CLOCK_TIME_2 |
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CCM_PLL1_CTRL_N(clk / 24000000),
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&ccm->pll1_c0_cfg);
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while (!(readl(&ccm->pll_stable_status) & 0x01)) {}
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writel(CCM_PLL1_CTRL_EN | CCM_PLL1_CTRL_P(p) | CMM_PLL1_CLOCK_TIME_2 |
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CCM_PLL1_CTRL_N(clk / (24000000)),
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&ccm->pll1_c1_cfg);
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while (!(readl(&ccm->pll_stable_status) & 0x02)) {}
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/* Switch CPU to PLL1 */
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writel(AXI_DIV_2 << AXI0_DIV_SHIFT |
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AXI_DIV_2 << AXI1_DIV_SHIFT |
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CPU_CLK_SRC_PLL1 << C0_CPUX_CLK_SRC_SHIFT |
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CPU_CLK_SRC_PLL1 << C1_CPUX_CLK_SRC_SHIFT,
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&ccm->cpu_axi_cfg);
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}
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#endif
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void clock_set_pll5(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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unsigned int div1 = 0, div2 = 0;
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/* A83T PLL5 DDR rate = 24000000 * (n+1)/(div1+1)/(div2+1) */
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writel(CCM_PLL5_CTRL_EN | CCM_PLL5_CTRL_UPD |
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CCM_PLL5_CTRL_N(clk / (24000000)) |
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div2 << CCM_PLL5_DIV2_SHIFT |
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div1 << CCM_PLL5_DIV1_SHIFT, &ccm->pll5_cfg);
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udelay(5500);
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}
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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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return 24000000 * n / div1 / div2;
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}
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