clock_sun8i_a83t.c
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/*
* A83 specific clock code
*
* (C) Copyright 2007-2012
* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
* Tom Cubie <tangliang@allwinnertech.com>
*
* (C) Copyright 2015 Vishnu Patekar <vishnupatekar0510@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/prcm.h>
#include <asm/arch/sys_proto.h>
#ifdef CONFIG_SPL_BUILD
void clock_init_safe(void)
{
struct sunxi_ccm_reg * const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
clock_set_pll1(408000000);
/* enable pll_hsic, default is 480M */
writel(PLL8_CFG_DEFAULT, &ccm->pll8_cfg);
writel(readl(&ccm->pll8_cfg) | (0x1 << 31), &ccm->pll8_cfg);
while (!(readl(&ccm->pll_stable_status) & (1 << 8))) {}
/* switch to default 24MHz before changing to hsic */
writel(0x0, &ccm->cci400_cfg);
sdelay(50);
writel(CCM_CCI400_CLK_SEL_HSIC, &ccm->cci400_cfg);
sdelay(100);
/* switch before changing pll6 */
clrsetbits_le32(&ccm->ahb1_apb1_div, AHB1_CLK_SRC_MASK,
AHB1_CLK_SRC_OSC24M);
writel(PLL6_CFG_DEFAULT, &ccm->pll6_cfg);
while (!(readl(&ccm->pll_stable_status) & (1 << 6))) {}
writel(AHB1_ABP1_DIV_DEFAULT, &ccm->ahb1_apb1_div);
writel(CCM_MBUS_RESET_RESET, &ccm->mbus_reset);
writel(MBUS_CLK_DEFAULT, &ccm->mbus_clk_cfg);
/* timestamp */
writel(1, 0x01720000);
}
#endif
void clock_init_uart(void)
{
struct sunxi_ccm_reg *const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
/* uart clock source is apb2 */
writel(APB2_CLK_SRC_OSC24M|
APB2_CLK_RATE_N_1|
APB2_CLK_RATE_M(1),
&ccm->apb2_div);
/* open the clock for uart */
setbits_le32(&ccm->apb2_gate,
CLK_GATE_OPEN << (APB2_GATE_UART_SHIFT +
CONFIG_CONS_INDEX - 1));
/* deassert uart reset */
setbits_le32(&ccm->apb2_reset_cfg,
1 << (APB2_RESET_UART_SHIFT +
CONFIG_CONS_INDEX - 1));
}
#ifdef CONFIG_SPL_BUILD
void clock_set_pll1(unsigned int clk)
{
struct sunxi_ccm_reg * const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
const int p = 0;
/* Switch to 24MHz clock while changing PLL1 */
writel(AXI_DIV_2 << AXI0_DIV_SHIFT |
AXI_DIV_2 << AXI1_DIV_SHIFT |
CPU_CLK_SRC_OSC24M << C0_CPUX_CLK_SRC_SHIFT |
CPU_CLK_SRC_OSC24M << C1_CPUX_CLK_SRC_SHIFT,
&ccm->cpu_axi_cfg);
/* clk = 24*n/p, p is ignored if clock is >288MHz */
writel(CCM_PLL1_CTRL_EN | CCM_PLL1_CTRL_P(p) | CMM_PLL1_CLOCK_TIME_2 |
CCM_PLL1_CTRL_N(clk / 24000000),
&ccm->pll1_c0_cfg);
while (!(readl(&ccm->pll_stable_status) & 0x01)) {}
writel(CCM_PLL1_CTRL_EN | CCM_PLL1_CTRL_P(p) | CMM_PLL1_CLOCK_TIME_2 |
CCM_PLL1_CTRL_N(clk / (24000000)),
&ccm->pll1_c1_cfg);
while (!(readl(&ccm->pll_stable_status) & 0x02)) {}
/* Switch CPU to PLL1 */
writel(AXI_DIV_2 << AXI0_DIV_SHIFT |
AXI_DIV_2 << AXI1_DIV_SHIFT |
CPU_CLK_SRC_PLL1 << C0_CPUX_CLK_SRC_SHIFT |
CPU_CLK_SRC_PLL1 << C1_CPUX_CLK_SRC_SHIFT,
&ccm->cpu_axi_cfg);
}
#endif
void clock_set_pll5(unsigned int clk)
{
struct sunxi_ccm_reg * const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
unsigned int div1 = 0, div2 = 0;
/* A83T PLL5 DDR rate = 24000000 * (n+1)/(div1+1)/(div2+1) */
writel(CCM_PLL5_CTRL_EN | CCM_PLL5_CTRL_UPD |
CCM_PLL5_CTRL_N(clk / (24000000)) |
div2 << CCM_PLL5_DIV2_SHIFT |
div1 << CCM_PLL5_DIV1_SHIFT, &ccm->pll5_cfg);
udelay(5500);
}
unsigned int clock_get_pll6(void)
{
struct sunxi_ccm_reg *const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
uint32_t rval = readl(&ccm->pll6_cfg);
int n = ((rval & CCM_PLL6_CTRL_N_MASK) >> CCM_PLL6_CTRL_N_SHIFT);
int div1 = ((rval & CCM_PLL6_CTRL_DIV1_MASK) >>
CCM_PLL6_CTRL_DIV1_SHIFT) + 1;
int div2 = ((rval & CCM_PLL6_CTRL_DIV2_MASK) >>
CCM_PLL6_CTRL_DIV2_SHIFT) + 1;
return 24000000 * n / div1 / div2;
}