diff options
| author | Simon Glass <sjg@chromium.org> | 2016-01-21 19:45:17 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2016-01-21 20:42:37 -0700 |
| commit | dae594f2105b08ce76aa6b3b02433abb0796be51 (patch) | |
| tree | b4245d9043e7cadd9df635c7807ed6dcb3df3240 /drivers/clk | |
| parent | 318922b30fd0f255a72d7ccd7d7fd58dfb5feb2e (diff) | |
rockchip: spl: Support full-speed CPU in SPL
Add a feature which speeds up the CPU to full speed in SPL to minimise
boot time. This is only supported for certain boards (at present only
jerry).
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/clk')
| -rw-r--r-- | drivers/clk/clk_rk3288.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/clk/clk_rk3288.c b/drivers/clk/clk_rk3288.c index 8ef68fe0cd..2a85e93a6c 100644 --- a/drivers/clk/clk_rk3288.c +++ b/drivers/clk/clk_rk3288.c @@ -59,6 +59,16 @@ enum { /* PLL CON3 */ PLL_RESET_SHIFT = 5, + /* CLKSEL0 */ + CORE_SEL_PLL_MASK = 1, + CORE_SEL_PLL_SHIFT = 15, + A17_DIV_MASK = 0x1f, + A17_DIV_SHIFT = 8, + MP_DIV_MASK = 0xf, + MP_DIV_SHIFT = 4, + M0_DIV_MASK = 0xf, + M0_DIV_SHIFT = 0, + /* CLKSEL1: pd bus clk pll sel: codec or general */ PD_BUS_SEL_PLL_MASK = 15, PD_BUS_SEL_CPLL = 0, @@ -438,6 +448,52 @@ static void rkclk_init(struct rk3288_cru *cru, struct rk3288_grf *grf) } #endif +void rkclk_configure_cpu(struct rk3288_cru *cru, struct rk3288_grf *grf) +{ + /* 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_init_cfg); + + /* waiting for pll lock */ + while (!(readl(&grf->soc_status[1]) & SOCSTS_APLL_LOCK)) + udelay(1); + + /* + * core clock pll source selection and + * set up dependent divisors for MPAXI/M0AXI and ARM clocks. + * core clock select apll, apll clk = 1800MHz + * arm clk = 1800MHz, mpclk = 450MHz, m0clk = 900MHz + */ + rk_clrsetreg(&cru->cru_clksel_con[0], + CORE_SEL_PLL_MASK << CORE_SEL_PLL_SHIFT | + A17_DIV_MASK << A17_DIV_SHIFT | + MP_DIV_MASK << MP_DIV_SHIFT | + M0_DIV_MASK << M0_DIV_SHIFT, + 0 << A17_DIV_SHIFT | + 3 << MP_DIV_SHIFT | + 1 << M0_DIV_SHIFT); + + /* + * set up dependent divisors for L2RAM/ATCLK and PCLK clocks. + * l2ramclk = 900MHz, atclk = 450MHz, pclk_dbg = 450MHz + */ + rk_clrsetreg(&cru->cru_clksel_con[37], + CLK_L2RAM_DIV_MASK << CLK_L2RAM_DIV_SHIFT | + ATCLK_CORE_DIV_CON_MASK << ATCLK_CORE_DIV_CON_SHIFT | + PCLK_CORE_DBG_DIV_MASK >> PCLK_CORE_DBG_DIV_SHIFT, + 1 << CLK_L2RAM_DIV_SHIFT | + 3 << ATCLK_CORE_DIV_CON_SHIFT | + 3 << PCLK_CORE_DBG_DIV_SHIFT); + + /* PLL enter normal-mode */ + rk_clrsetreg(&cru->cru_mode_con, + APLL_MODE_MASK << APLL_MODE_SHIFT, + APLL_MODE_NORMAL << APLL_MODE_SHIFT); +} + /* Get pll rate by id */ static uint32_t rkclk_pll_get_rate(struct rk3288_cru *cru, enum rk_clk_id clk_id) |