diff options
Diffstat (limited to 'meta-openbmc-mods/meta-ast2500/recipes-bsp/u-boot/files/0021-Config-host-uart-clock-source-using-environment-vari.patch')
| -rw-r--r-- | meta-openbmc-mods/meta-ast2500/recipes-bsp/u-boot/files/0021-Config-host-uart-clock-source-using-environment-vari.patch | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-ast2500/recipes-bsp/u-boot/files/0021-Config-host-uart-clock-source-using-environment-vari.patch b/meta-openbmc-mods/meta-ast2500/recipes-bsp/u-boot/files/0021-Config-host-uart-clock-source-using-environment-vari.patch new file mode 100644 index 000000000..7cc0d2d11 --- /dev/null +++ b/meta-openbmc-mods/meta-ast2500/recipes-bsp/u-boot/files/0021-Config-host-uart-clock-source-using-environment-vari.patch @@ -0,0 +1,106 @@ +From 2740b1112737d3acd23d3a0b56ab26b05a5d1a5e Mon Sep 17 00:00:00 2001 +From: Yong Li <yong.b.li@linux.intel.com> +Date: Mon, 11 Feb 2019 15:19:56 +0800 +Subject: [PATCH] Config host uart clock source using environment variable + +In order to support high speed uart for host uarts, +the uart clock needs to be switched between 24M and 192M. +Config SCU4C based on environment variable hostserialcfg, +this variable is set by IPMI OEM commands. + +Tested: +Change the hostserialcfg variable to 0/1/2/3, +using the below commands: + +ipmitool raw 0x32 0x90 1 0; reboot +cat /sys/class/tty/ttyS*/uartclk, all should be 24MHz + +ipmitool raw 0x32 0x90 1 1; reboot +cat /sys/class/tty/ttyS*/uartclk, ttyS0/2/3 should be 192MHz + +ipmitool raw 0x32 0x90 1 2; reboot +cat /sys/class/tty/ttyS*/uartclk, ttyS1 should be 192MHz + +ipmitool raw 0x32 0x90 1 3; reboot +cat /sys/class/tty/ttyS*/uartclk, ttyS0/12/3 should be 192MHz + +Signed-off-by: Yong Li <yong.b.li@linux.intel.com> + +--- + arch/arm/include/asm/arch-aspeed/regs-scu.h | 5 +++ + board/aspeed/ast-g5/ast-g5-intel.c | 39 +++++++++++++++++++++ + 2 files changed, 44 insertions(+) + +diff --git a/arch/arm/include/asm/arch-aspeed/regs-scu.h b/arch/arm/include/asm/arch-aspeed/regs-scu.h +index 019c00036a..a2c9549fc6 100644 +--- a/arch/arm/include/asm/arch-aspeed/regs-scu.h ++++ b/arch/arm/include/asm/arch-aspeed/regs-scu.h +@@ -530,6 +530,11 @@ + /* AST_SCU_MAC_CLK 0x48 - MAC interface clock delay setting register */ + + /* AST_SCU_MISC2_CTRL 0x4C - Misc. 2 Control register */ ++#define SCU_UART5_HS_CLOCK (1 << 28) ++#define SCU_UART4_HS_CLOCK (1 << 27) ++#define SCU_UART3_HS_CLOCK (1 << 26) ++#define SCU_UART2_HS_CLOCK (1 << 25) ++#define SCU_UART1_HS_CLOCK (1 << 24) + #ifdef AST_SOC_G5 + #define SCU_PCIE_MAPPING_HIGH (1 << 15) + #define SCU_MALI_DTY_MODE (1 << 8) +diff --git a/board/aspeed/ast-g5/ast-g5-intel.c b/board/aspeed/ast-g5/ast-g5-intel.c +index a223c798ac..a16e1330a0 100644 +--- a/board/aspeed/ast-g5/ast-g5-intel.c ++++ b/board/aspeed/ast-g5/ast-g5-intel.c +@@ -106,6 +106,9 @@ static const GPIOValue gpio_table[] = { + #define SGPIO_ENABLE 1 + #define GPIO254 0x254 + ++#define HOST_SERIAL_A_HIGH_SPEED (1 << 0) ++#define HOST_SERIAL_B_HIGH_SPEED (1 << 1) ++ + static void sgpio_init(void) + { + uint32_t value; +@@ -398,6 +401,42 @@ void ast_g5_intel_late_init(void) + char value[32]; + u32 reset_reason = 0; + ++ /* By default host serail A and B use normal speed */ ++ uint32_t host_serial_cfg = 0; ++ char *host_serial_cfg_txt = NULL; ++ ++ /* Config the uart clock source based on environment configuration */ ++ host_serial_cfg_txt = getenv("hostserialcfg"); ++ ++ if (host_serial_cfg_txt != NULL) ++ host_serial_cfg = simple_strtoul(host_serial_cfg_txt, NULL, 16); ++ ++ if (host_serial_cfg > (HOST_SERIAL_A_HIGH_SPEED | HOST_SERIAL_B_HIGH_SPEED)) { ++ printf("Invalided hostserialcfg %x, use default!\n", host_serial_cfg); ++ host_serial_cfg = 0; ++ } ++ ++ /* SOL implementation requires uart1/uart3/uart4 have the same clock ++ * source for data forwarding, config uart3 and uart4 ++ */ ++ if (host_serial_cfg & HOST_SERIAL_A_HIGH_SPEED) { ++ ast_scu_write(ast_scu_read(AST_SCU_MISC2_CTRL) | ++ SCU_UART1_HS_CLOCK | SCU_UART3_HS_CLOCK | ++ SCU_UART4_HS_CLOCK, AST_SCU_MISC2_CTRL); ++ } else { ++ ast_scu_write(ast_scu_read(AST_SCU_MISC2_CTRL) & ++ ~SCU_UART1_HS_CLOCK & ~SCU_UART3_HS_CLOCK & ++ ~SCU_UART4_HS_CLOCK, AST_SCU_MISC2_CTRL); ++ } ++ ++ if (host_serial_cfg & HOST_SERIAL_B_HIGH_SPEED) { ++ ast_scu_write(ast_scu_read(AST_SCU_MISC2_CTRL) | ++ SCU_UART2_HS_CLOCK, AST_SCU_MISC2_CTRL); ++ } else { ++ ast_scu_write(ast_scu_read(AST_SCU_MISC2_CTRL) & ++ ~SCU_UART2_HS_CLOCK, AST_SCU_MISC2_CTRL); ++ } ++ + /* save and clear reset status */ + reset_reason = ast_scu_read(AST_SCU_SYS_CTRL); + snprintf(value, sizeof(value), "0x%x", reset_reason); |