diff --git a/src/cpu/allwinner/a10/Kconfig b/src/cpu/allwinner/a10/Kconfig index 814b69e1f0..0e5aba98b7 100644 --- a/src/cpu/allwinner/a10/Kconfig +++ b/src/cpu/allwinner/a10/Kconfig @@ -13,5 +13,6 @@ config CPU_SPECIFIC_OPTIONS select HAVE_MONOTONIC_TIMER select HAVE_UART_SPECIAL select BOOTBLOCK_CONSOLE + select UART_OVERRIDE_REFCLK endif # if CPU_ALLWINNER_A10 diff --git a/src/cpu/ti/am335x/Kconfig b/src/cpu/ti/am335x/Kconfig index 8d3c691161..f44c69d686 100644 --- a/src/cpu/ti/am335x/Kconfig +++ b/src/cpu/ti/am335x/Kconfig @@ -7,5 +7,6 @@ config CPU_TI_AM335X select HAVE_UART_SPECIAL select BOOTBLOCK_CONSOLE select GENERIC_UDELAY + select UART_OVERRIDE_REFCLK bool default n diff --git a/src/drivers/uart/Kconfig b/src/drivers/uart/Kconfig index cb129b0643..4faa48d9f0 100644 --- a/src/drivers/uart/Kconfig +++ b/src/drivers/uart/Kconfig @@ -20,6 +20,13 @@ config UART_OVERRIDE_INPUT_CLOCK_DIVIDER Set to "y" when the platform overrides the uart_input_clock_divider routine. +config UART_OVERRIDE_REFCLK + boolean + default n + help + Set to "y" when the platform overrides the uart_platform_refclk + routine. + config DRIVERS_UART_8250MEM bool default n @@ -39,6 +46,7 @@ config DRIVERS_UART_OXPCIE depends on PCI select DRIVERS_UART_8250MEM select EARLY_PCI_BRIDGE + select UART_OVERRIDE_REFCLK help Support for Oxford OXPCIe952 serial port PCIe cards. Currently only devices with the vendor ID 0x1415 and device ID diff --git a/src/drivers/uart/oxpcie_early.c b/src/drivers/uart/oxpcie_early.c index 6582a9e5ab..0a778d98c7 100644 --- a/src/drivers/uart/oxpcie_early.c +++ b/src/drivers/uart/oxpcie_early.c @@ -92,10 +92,7 @@ void uart_fill_lb(void *data) serial.baseaddr = uart_platform_base(CONFIG_UART_FOR_CONSOLE); serial.baud = default_baudrate(); serial.regwidth = 1; - if (IS_ENABLED(CONFIG_UART_USE_REFCLK_AS_INPUT_CLOCK)) - serial.input_hertz = uart_platform_refclk(); - else - serial.input_hertz = 0; + serial.input_hertz = uart_platform_refclk(); serial.uart_pci_addr = CONFIG_UART_PCI_ADDR; lb_add_serial(&serial, data); diff --git a/src/drivers/uart/pl011.c b/src/drivers/uart/pl011.c index 808cb46538..0c7ac08ed5 100644 --- a/src/drivers/uart/pl011.c +++ b/src/drivers/uart/pl011.c @@ -48,10 +48,7 @@ void uart_fill_lb(void *data) serial.baseaddr = uart_platform_base(CONFIG_UART_FOR_CONSOLE); serial.baud = default_baudrate(); serial.regwidth = 1; - if (IS_ENABLED(CONFIG_UART_USE_REFCLK_AS_INPUT_CLOCK)) - serial.input_hertz = uart_platform_refclk(); - else - serial.input_hertz = 0; + serial.input_hertz = uart_platform_refclk(); serial.uart_pci_addr = CONFIG_UART_PCI_ADDR; lb_add_serial(&serial, data); diff --git a/src/drivers/uart/uart8250io.c b/src/drivers/uart/uart8250io.c index 69244f58df..89c447658a 100644 --- a/src/drivers/uart/uart8250io.c +++ b/src/drivers/uart/uart8250io.c @@ -27,16 +27,6 @@ /* Should support 8250, 16450, 16550, 16550A type UARTs */ -/* Nominal values only, good for the range of choices Kconfig offers for - * set of standard baudrates. - */ - -/* Multiply the maximim baud-rate by the default oversample rate to compute - * the default input clock to the UART. The uart_baudrate_divisor divides - * by the oversample clock to determine the final baud-rate. - */ -#define BAUDRATE_REFCLK (115200 * 16) - /* Expected character delay at 1200bps is 9ms for a working UART * and no flow-control. Assume UART as stuck if shift register * or FIFO takes more than 50ms per character to appear empty. @@ -115,7 +105,7 @@ uintptr_t uart_platform_base(int idx) void uart_init(int idx) { unsigned int div; - div = uart_baudrate_divisor(default_baudrate(), BAUDRATE_REFCLK, + div = uart_baudrate_divisor(default_baudrate(), uart_platform_refclk(), uart_input_clock_divider()); uart8250_init(uart_platform_base(idx), div); } @@ -143,10 +133,7 @@ void uart_fill_lb(void *data) serial.baseaddr = uart_platform_base(CONFIG_UART_FOR_CONSOLE); serial.baud = default_baudrate(); serial.regwidth = 1; - if (IS_ENABLED(CONFIG_UART_USE_REFCLK_AS_INPUT_CLOCK)) - serial.input_hertz = uart_platform_refclk(); - else - serial.input_hertz = 0; + serial.input_hertz = uart_platform_refclk(); serial.uart_pci_addr = CONFIG_UART_PCI_ADDR; lb_add_serial(&serial, data); diff --git a/src/drivers/uart/uart8250mem.c b/src/drivers/uart/uart8250mem.c index 4b87756d0b..cf58423b86 100644 --- a/src/drivers/uart/uart8250mem.c +++ b/src/drivers/uart/uart8250mem.c @@ -157,10 +157,7 @@ void uart_fill_lb(void *data) serial.regwidth = sizeof(uint32_t); else serial.regwidth = sizeof(uint8_t); - if (IS_ENABLED(CONFIG_UART_USE_REFCLK_AS_INPUT_CLOCK)) - serial.input_hertz = uart_platform_refclk(); - else - serial.input_hertz = 0; + serial.input_hertz = uart_platform_refclk(); serial.uart_pci_addr = CONFIG_UART_PCI_ADDR; lb_add_serial(&serial, data); diff --git a/src/drivers/uart/util.c b/src/drivers/uart/util.c index 5e8d223252..86da8dc746 100644 --- a/src/drivers/uart/util.c +++ b/src/drivers/uart/util.c @@ -59,3 +59,19 @@ unsigned int uart_input_clock_divider(void) return 16; } #endif + +#if !IS_ENABLED(CONFIG_UART_OVERRIDE_REFCLK) +unsigned int uart_platform_refclk(void) +{ + /* Specify the default input clock frequency for the UART. + * + * The older UART's used an input clock frequency of 1.8432 MHz which + * with the 16x oversampling provided the maximum baud-rate of 115200. + * Specify this as maximum baud-rate multiplied by oversample so that + * it is obvious that the maximum baud rate is 115200 when divided by + * oversample clock. Also note that crystal on the board does not + * change when software selects another input clock divider. + */ + return 115200 * 16; +} +#endif diff --git a/src/soc/imgtec/pistachio/Kconfig b/src/soc/imgtec/pistachio/Kconfig index 5ea6b95107..da33cc5c96 100644 --- a/src/soc/imgtec/pistachio/Kconfig +++ b/src/soc/imgtec/pistachio/Kconfig @@ -25,6 +25,7 @@ config CPU_IMGTEC_PISTACHIO select SPI_ATOMIC_SEQUENCING select GENERIC_GPIO_LIB select HAVE_HARD_RESET + select UART_OVERRIDE_REFCLK bool if CPU_IMGTEC_PISTACHIO diff --git a/src/soc/intel/apollolake/uart_early.c b/src/soc/intel/apollolake/uart_early.c index e8dfeda565..0e530609bd 100644 --- a/src/soc/intel/apollolake/uart_early.c +++ b/src/soc/intel/apollolake/uart_early.c @@ -68,12 +68,6 @@ uintptr_t uart_platform_base(int idx) return (CONFIG_CONSOLE_UART_BASE_ADDRESS); } -unsigned int uart_platform_refclk(void) -{ - /* That's within 0.5% of the actual value we've set earlier */ - return 115200 * 16; -} - static const struct pad_config uart_gpios[] = { PAD_CFG_NF(GPIO_42, NATIVE, DEEP, NF1), /* UART1 RX */ PAD_CFG_NF(GPIO_43, NATIVE, DEEP, NF1), /* UART1 TX */ diff --git a/src/soc/intel/quark/Kconfig b/src/soc/intel/quark/Kconfig index ae25c328c6..6a2349fb8d 100644 --- a/src/soc/intel/quark/Kconfig +++ b/src/soc/intel/quark/Kconfig @@ -30,6 +30,7 @@ config CPU_SPECIFIC_OPTIONS select SOC_INTEL_COMMON select SOC_SETS_MTRRS select TSC_CONSTANT_RATE + select UART_OVERRIDE_REFCLK select UDELAY_TSC select UNCOMPRESSED_RAMSTAGE select USE_MARCH_586 diff --git a/src/soc/intel/skylake/uart_debug.c b/src/soc/intel/skylake/uart_debug.c index c463bea145..f3d576b3aa 100644 --- a/src/soc/intel/skylake/uart_debug.c +++ b/src/soc/intel/skylake/uart_debug.c @@ -18,17 +18,6 @@ #include #include -unsigned int uart_platform_refclk(void) -{ - /* - * Set M and N divisor inputs and enable clock. - * Main reference frequency to UART is: - * 120MHz * M / N = 120MHz * 48 / 3125 = 1843200Hz - * The different order below is to handle integer math overflow. - */ - return 120 * MHz / SIO_REG_PPR_CLOCK_N_DIV * SIO_REG_PPR_CLOCK_M_DIV; -} - uintptr_t uart_platform_base(int idx) { /* Same base address for all debug port usage. In reality UART2 diff --git a/src/soc/marvell/armada38x/Kconfig b/src/soc/marvell/armada38x/Kconfig index 6754a0f1f6..ed8cbe8100 100644 --- a/src/soc/marvell/armada38x/Kconfig +++ b/src/soc/marvell/armada38x/Kconfig @@ -10,6 +10,7 @@ config SOC_MARVELL_ARMADA38X select RETURN_FROM_VERSTAGE select BOOTBLOCK_CUSTOM select GENERIC_UDELAY + select UART_OVERRIDE_REFCLK if SOC_MARVELL_ARMADA38X diff --git a/src/soc/nvidia/tegra132/Kconfig b/src/soc/nvidia/tegra132/Kconfig index 502e7c4c72..08ed47567b 100644 --- a/src/soc/nvidia/tegra132/Kconfig +++ b/src/soc/nvidia/tegra132/Kconfig @@ -13,6 +13,7 @@ config SOC_NVIDIA_TEGRA132 select HAVE_HARD_RESET select HAVE_UART_SPECIAL select GENERIC_GPIO_LIB + select UART_OVERRIDE_REFCLK if SOC_NVIDIA_TEGRA132 diff --git a/src/soc/rockchip/rk3288/Kconfig b/src/soc/rockchip/rk3288/Kconfig index 8b15d3dc45..0f394b18b4 100644 --- a/src/soc/rockchip/rk3288/Kconfig +++ b/src/soc/rockchip/rk3288/Kconfig @@ -27,6 +27,7 @@ config SOC_ROCKCHIP_RK3288 select UNCOMPRESSED_RAMSTAGE select GENERIC_GPIO_LIB select RTC + select UART_OVERRIDE_REFCLK if SOC_ROCKCHIP_RK3288 diff --git a/src/soc/rockchip/rk3399/Kconfig b/src/soc/rockchip/rk3399/Kconfig index 43bb03bd4e..38d0f00413 100644 --- a/src/soc/rockchip/rk3399/Kconfig +++ b/src/soc/rockchip/rk3399/Kconfig @@ -12,6 +12,7 @@ config SOC_ROCKCHIP_RK3399 select GENERIC_UDELAY select HAVE_MONOTONIC_TIMER select UNCOMPRESSED_RAMSTAGE + select UART_OVERRIDE_REFCLK if SOC_ROCKCHIP_RK3399 diff --git a/src/southbridge/amd/pi/hudson/Kconfig b/src/southbridge/amd/pi/hudson/Kconfig index aa55339ea0..8fe3b2d897 100644 --- a/src/southbridge/amd/pi/hudson/Kconfig +++ b/src/southbridge/amd/pi/hudson/Kconfig @@ -235,6 +235,7 @@ config HUDSON_UART select DRIVERS_UART_8250MEM select DRIVERS_UART_8250MEM_32 select NO_UART_ON_SUPERIO + select UART_OVERRIDE_REFCLK help There are two UART controllers in Kern. The UART registers are memory-mapped. UART