diff options
| -rw-r--r-- | arch/arm/include/asm/arch-rockchip/cru_rk3188.h | 1 | ||||
| -rw-r--r-- | drivers/clk/rockchip/clk_rk3188.c | 63 |
2 files changed, 64 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-rockchip/cru_rk3188.h b/arch/arm/include/asm/arch-rockchip/cru_rk3188.h index 74f0fed..f5d6420 100644 --- a/arch/arm/include/asm/arch-rockchip/cru_rk3188.h +++ b/arch/arm/include/asm/arch-rockchip/cru_rk3188.h @@ -9,6 +9,7 @@ #define OSC_HZ (24 * 1000 * 1000) #define APLL_HZ (1608 * 1000000) +#define APLL_SAFE_HZ (600 * 1000000) #define GPLL_HZ (594 * 1000000) #define CPLL_HZ (384 * 1000000) diff --git a/drivers/clk/rockchip/clk_rk3188.c b/drivers/clk/rockchip/clk_rk3188.c index 459649f..d36cf8f 100644 --- a/drivers/clk/rockchip/clk_rk3188.c +++ b/drivers/clk/rockchip/clk_rk3188.c @@ -168,6 +168,65 @@ static int rkclk_configure_ddr(struct rk3188_cru *cru, struct rk3188_grf *grf, return 0; } +static int rkclk_configure_cpu(struct rk3188_cru *cru, struct rk3188_grf *grf, + unsigned int hz, bool has_bwadj) +{ + static const struct pll_div apll_cfg[] = { + {.nf = 50, .nr = 1, .no = 2}, + {.nf = 67, .nr = 1, .no = 1}, + }; + int div_core_peri, div_aclk_core, cfg; + + /* + * We support two possible frequencies, the safe 600MHz + * which will work with default pmic settings and will + * be set in SPL to get away from the 24MHz default and + * the maximum of 1.6Ghz, which boards can set if they + * were able to get pmic support for it. + */ + switch (hz) { + case APLL_SAFE_HZ: + cfg = 0; + div_core_peri = 1; + div_aclk_core = 3; + break; + case APLL_HZ: + cfg = 1; + div_core_peri = 2; + div_aclk_core = 3; + break; + default: + debug("Unsupported ARMCLK frequency"); + return -EINVAL; + } + + /* pll enter slow-mode */ + rk_clrsetreg(&cru->cru_mode_con, APLL_MODE_MASK << APLL_MODE_SHIFT, + APLL_MODE_SLOW << APLL_MODE_SHIFT); + + rkclk_set_pll(cru, CLK_ARM, &apll_cfg[cfg], has_bwadj); + + /* waiting for pll lock */ + while (!(readl(&grf->soc_status0) & SOCSTS_APLL_LOCK)) + udelay(1); + + /* Set divider for peripherals attached to the cpu core. */ + rk_clrsetreg(&cru->cru_clksel_con[0], + CORE_PERI_DIV_MASK << CORE_PERI_DIV_SHIFT, + div_core_peri << CORE_PERI_DIV_SHIFT); + + /* set up dependent divisor for aclk_core */ + rk_clrsetreg(&cru->cru_clksel_con[1], + CORE_ACLK_DIV_MASK << CORE_ACLK_DIV_SHIFT, + div_aclk_core << CORE_ACLK_DIV_SHIFT); + + /* PLL enter normal-mode */ + rk_clrsetreg(&cru->cru_mode_con, APLL_MODE_MASK << APLL_MODE_SHIFT, + APLL_MODE_NORMAL << APLL_MODE_SHIFT); + + return hz; +} + /* Get pll rate by id */ static uint32_t rkclk_pll_get_rate(struct rk3188_cru *cru, enum rk_clk_id clk_id) @@ -435,6 +494,10 @@ static ulong rk3188_clk_set_rate(struct clk *clk, ulong rate) ulong new_rate; switch (clk->id) { + case PLL_APLL: + new_rate = rkclk_configure_cpu(priv->cru, priv->grf, rate, + priv->has_bwadj); + break; case CLK_DDR: new_rate = rkclk_configure_ddr(priv->cru, priv->grf, rate, priv->has_bwadj); |