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/*
* sun6i specific clock code
*
* (C) Copyright 2007-2012
* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
* Tom Cubie <tangliang@allwinnertech.com>
*
* (C) Copyright 2013 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
*
* 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;
struct sunxi_prcm_reg * const prcm =
(struct sunxi_prcm_reg *)SUNXI_PRCM_BASE;
/* Set PLL ldo voltage without this PLL6 does not work properly.
*
* As the A31 manual states, that "before enable PLL, PLLVDD
* LDO should be set to 1.37v", we need to configure this to 2.5v
* in the "PLL Input Power Select" (0 << 15) and (7 << 16).
*/
clrsetbits_le32(&prcm->pll_ctrl1, PRCM_PLL_CTRL_LDO_KEY_MASK,
PRCM_PLL_CTRL_LDO_KEY);
clrsetbits_le32(&prcm->pll_ctrl1, ~PRCM_PLL_CTRL_LDO_KEY_MASK,
PRCM_PLL_CTRL_LDO_DIGITAL_EN | PRCM_PLL_CTRL_LDO_ANALOG_EN |
PRCM_PLL_CTRL_EXT_OSC_EN | PRCM_PLL_CTRL_LDO_OUT_L(1370) );
clrbits_le32(&prcm->pll_ctrl1, PRCM_PLL_CTRL_LDO_KEY_MASK);
/* Give the PLL LDO voltage setting some time to take hold.
* Notes:
* 1) We need to use sdelay() as the timers aren't set up yet.
* 2) The 100k iterations come from Boot1, which spin's for 100k
* iterations through a loop.
*/
sdelay(100000);
clock_set_pll1(408000000);
writel(AHB1_ABP1_DIV_DEFAULT, &ccm->ahb1_apb1_div);
/* Enable PLL6 at 600MHz */
clock_pll6_init();
writel(MBUS_CLK_DEFAULT, &ccm->mbus0_clk_cfg);
writel(MBUS_CLK_DEFAULT, &ccm->mbus1_clk_cfg);
}
#endif
void clock_init_uart(void)
{
#if CONFIG_CONS_INDEX < 5
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));
#else
/* enable R_PIO and R_UART clocks, and de-assert resets */
prcm_apb0_enable(PRCM_APB0_GATE_PIO | PRCM_APB0_GATE_UART);
#endif
}
int clock_twi_onoff(int port, int state)
{
struct sunxi_ccm_reg *const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
if (port > 3)
return -1;
/* set the apb clock gate for twi */
if (state)
setbits_le32(&ccm->apb2_gate,
CLK_GATE_OPEN << (APB2_GATE_TWI_SHIFT+port));
else
clrbits_le32(&ccm->apb2_gate,
CLK_GATE_OPEN << (APB2_GATE_TWI_SHIFT+port));
return 0;
}
static inline void wait_for_pll_lock(u32 *reg)
{
do {
/* spin */
} while ((readl(reg) & CCM_PLLx_CTRL_LOCK) != CCM_PLLx_CTRL_LOCK);
}
#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;
int k = 2;
int m = 2;
if (clk > 1152000000) {
k = 4;
m = 2;
} else if (clk > 768000000) {
k = 3;
m = 2;
}
/* Switch to 24MHz clock while changing PLL1 */
writel(AXI_DIV_3 << AXI_DIV_SHIFT |
ATB_DIV_2 << ATB_DIV_SHIFT |
CPU_CLK_SRC_OSC24M << CPU_CLK_SRC_SHIFT,
&ccm->cpu_axi_cfg);
/*
* sun6i: PLL1 rate = ((24000000 * n * k) >> 0) / m (p is ignored)
* sun8i: PLL1 rate = ((24000000 * n * k) >> p) / m
*/
writel(CCM_PLL1_CTRL_EN | CCM_PLL1_CTRL_P(p) |
CCM_PLL1_CTRL_N(clk / (24000000 * k / m)) |
CCM_PLL1_CTRL_K(k) | CCM_PLL1_CTRL_M(m), &ccm->pll1_cfg);
wait_for_pll_lock(&ccm->pll1_cfg);
/* Switch CPU to PLL1 */
writel(AXI_DIV_3 << AXI_DIV_SHIFT |
ATB_DIV_2 << ATB_DIV_SHIFT |
CPU_CLK_SRC_PLL1 << CPU_CLK_SRC_SHIFT,
&ccm->cpu_axi_cfg);
}
#endif
void clock_set_pll3(unsigned int clk)
{
struct sunxi_ccm_reg * const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
const int m = 8; /* 3 MHz steps just like sun4i, sun5i and sun7i */
if (clk == 0) {
clrbits_le32(&ccm->pll3_cfg, CCM_PLL3_CTRL_EN);
return;
}
/* PLL3 rate = 24000000 * n / m */
writel(CCM_PLL3_CTRL_EN | CCM_PLL3_CTRL_INTEGER_MODE |
CCM_PLL3_CTRL_N(clk / (24000000 / m)) | CCM_PLL3_CTRL_M(m),
&ccm->pll3_cfg);
wait_for_pll_lock(&ccm->pll3_cfg);
}
void clock_set_pll5(unsigned int clk, bool sigma_delta_enable)
{
struct sunxi_ccm_reg * const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
const int max_n = 32;
int k = 1, m = 2;
if (sigma_delta_enable)
writel(CCM_PLL5_PATTERN, &ccm->pll5_pattern_cfg);
/* PLL5 rate = 24000000 * n * k / m */
if (clk > 24000000 * k * max_n / m) {
m = 1;
if (clk > 24000000 * k * max_n / m)
k = 2;
}
writel(CCM_PLL5_CTRL_EN |
(sigma_delta_enable ? CCM_PLL5_CTRL_SIGMA_DELTA_EN : 0) |
CCM_PLL5_CTRL_UPD |
CCM_PLL5_CTRL_N(clk / (24000000 * k / m)) |
CCM_PLL5_CTRL_K(k) | CCM_PLL5_CTRL_M(m), &ccm->pll5_cfg);
wait_for_pll_lock(&ccm->pll5_cfg);
}
void clock_pll6_init()
{
struct sunxi_ccm_reg * const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
/* The A31 reference manual states, that "the PLL6 output
* should be fixed to 600MHz, and is not recommended to be
* modified.".
*
* We always configure this to N=25 and K=2 for 600Mhz:
* 600MHz = 24MHz x N(25) x K(2) / 2
*
* N.B.: The lowest 2 bits need to be writte 01b (0x1),
* as the fixed divider doesn't seem to be fixed.
*/
writel(CCM_PLL6_CTRL_EN | CCM_PLL6_CTRL_24M_OUT_EN |
CCM_PLL6_CTRL_N(25) | CCM_PLL6_CTRL_K(2) |
CCM_PLL6_CTRL_M(2),
&ccm->pll6_cfg);
wait_for_pll_lock(&ccm->pll6_cfg);
}
#ifdef CONFIG_MACH_SUN8I_A33
void clock_set_pll11(unsigned int clk, bool sigma_delta_enable)
{
struct sunxi_ccm_reg * const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
if (sigma_delta_enable)
writel(CCM_PLL11_PATTERN, &ccm->pll5_pattern_cfg);
writel(CCM_PLL11_CTRL_EN | CCM_PLL11_CTRL_UPD |
(sigma_delta_enable ? CCM_PLL11_CTRL_SIGMA_DELTA_EN : 0) |
CCM_PLL11_CTRL_N(clk / 24000000), &ccm->pll11_cfg);
while (readl(&ccm->pll11_cfg) & CCM_PLL11_CTRL_UPD)
;
}
#endif
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) + 1;
int k = ((rval & CCM_PLL6_CTRL_K_MASK) >> CCM_PLL6_CTRL_K_SHIFT) + 1;
return 24000000 * n * k / 2;
}
void clock_set_de_mod_clock(u32 *clk_cfg, unsigned int hz)
{
int pll = clock_get_pll6() * 2;
int div = 1;
while ((pll / div) > hz)
div++;
writel(CCM_DE_CTRL_GATE | CCM_DE_CTRL_PLL6_2X | CCM_DE_CTRL_M(div),
clk_cfg);
}
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