diff options
Diffstat (limited to 'drivers/clk/clk-stm32f4.c')
| -rw-r--r-- | drivers/clk/clk-stm32f4.c | 56 |
1 files changed, 39 insertions, 17 deletions
diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c index ab609a76706f..68e2a4e499f1 100644 --- a/drivers/clk/clk-stm32f4.c +++ b/drivers/clk/clk-stm32f4.c @@ -429,6 +429,13 @@ static const struct clk_div_table pll_divp_table[] = { { 0, 2 }, { 1, 4 }, { 2, 6 }, { 3, 8 }, { 0 } }; +static const struct clk_div_table pll_divq_table[] = { + { 2, 2 }, { 3, 3 }, { 4, 4 }, { 5, 5 }, { 6, 6 }, { 7, 7 }, + { 8, 8 }, { 9, 9 }, { 10, 10 }, { 11, 11 }, { 12, 12 }, { 13, 13 }, + { 14, 14 }, { 15, 15 }, + { 0 } +}; + static const struct clk_div_table pll_divr_table[] = { { 2, 2 }, { 3, 3 }, { 4, 4 }, { 5, 5 }, { 6, 6 }, { 7, 7 }, { 0 } }; @@ -496,9 +503,9 @@ struct stm32f4_div_data { #define MAX_PLL_DIV 3 static const struct stm32f4_div_data div_data[MAX_PLL_DIV] = { - { 16, 2, 0, pll_divp_table }, - { 24, 4, CLK_DIVIDER_ONE_BASED, NULL }, - { 28, 3, 0, pll_divr_table }, + { 16, 2, 0, pll_divp_table }, + { 24, 4, 0, pll_divq_table }, + { 28, 3, 0, pll_divr_table }, }; struct stm32f4_pll_data { @@ -524,19 +531,26 @@ static int stm32f4_pll_is_enabled(struct clk_hw *hw) return clk_gate_ops.is_enabled(hw); } +#define PLL_TIMEOUT 10000 + static int stm32f4_pll_enable(struct clk_hw *hw) { struct clk_gate *gate = to_clk_gate(hw); struct stm32f4_pll *pll = to_stm32f4_pll(gate); - int ret = 0; - unsigned long reg; + int bit_status; + unsigned int timeout = PLL_TIMEOUT; - ret = clk_gate_ops.enable(hw); + if (clk_gate_ops.is_enabled(hw)) + return 0; - ret = readl_relaxed_poll_timeout_atomic(base + STM32F4_RCC_CR, reg, - reg & (1 << pll->bit_rdy_idx), 0, 10000); + clk_gate_ops.enable(hw); - return ret; + do { + bit_status = !(readl(gate->reg) & BIT(pll->bit_rdy_idx)); + + } while (bit_status && --timeout); + + return bit_status; } static void stm32f4_pll_disable(struct clk_hw *hw) @@ -827,24 +841,32 @@ struct stm32_rgate { u8 bit_rdy_idx; }; -#define RTC_TIMEOUT 1000000 +#define RGATE_TIMEOUT 50000 static int rgclk_enable(struct clk_hw *hw) { struct clk_gate *gate = to_clk_gate(hw); struct stm32_rgate *rgate = to_rgclk(gate); - u32 reg; - int ret; + int bit_status; + unsigned int timeout = RGATE_TIMEOUT; + + if (clk_gate_ops.is_enabled(hw)) + return 0; disable_power_domain_write_protection(); clk_gate_ops.enable(hw); - ret = readl_relaxed_poll_timeout_atomic(gate->reg, reg, - reg & rgate->bit_rdy_idx, 1000, RTC_TIMEOUT); + do { + bit_status = !(readl(gate->reg) & BIT(rgate->bit_rdy_idx)); + if (bit_status) + udelay(100); + + } while (bit_status && --timeout); enable_power_domain_write_protection(); - return ret; + + return bit_status; } static void rgclk_disable(struct clk_hw *hw) @@ -1526,7 +1548,7 @@ static void __init stm32f4_rcc_init(struct device_node *np) } clks[CLK_LSI] = clk_register_rgate(NULL, "lsi", "clk-lsi", 0, - base + STM32F4_RCC_CSR, 0, 2, 0, &stm32f4_clk_lock); + base + STM32F4_RCC_CSR, 0, 1, 0, &stm32f4_clk_lock); if (IS_ERR(clks[CLK_LSI])) { pr_err("Unable to register lsi clock\n"); @@ -1534,7 +1556,7 @@ static void __init stm32f4_rcc_init(struct device_node *np) } clks[CLK_LSE] = clk_register_rgate(NULL, "lse", "clk-lse", 0, - base + STM32F4_RCC_BDCR, 0, 2, 0, &stm32f4_clk_lock); + base + STM32F4_RCC_BDCR, 0, 1, 0, &stm32f4_clk_lock); if (IS_ERR(clks[CLK_LSE])) { pr_err("Unable to register lse clock\n"); |