diff options
Diffstat (limited to 'arch/x86/cpu/apollolake/cpu_common.c')
| -rw-r--r-- | arch/x86/cpu/apollolake/cpu_common.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/arch/x86/cpu/apollolake/cpu_common.c b/arch/x86/cpu/apollolake/cpu_common.c index 63f6999b02..5d7d26b140 100644 --- a/arch/x86/cpu/apollolake/cpu_common.c +++ b/arch/x86/cpu/apollolake/cpu_common.c @@ -7,11 +7,17 @@ #include <dm.h> #include <log.h> #include <asm/cpu_common.h> +#include <asm/io.h> #include <asm/msr.h> +#include <asm/pci.h> #include <asm/arch/cpu.h> #include <asm/arch/iomap.h> +#include <asm/arch/uart.h> #include <power/acpi_pmc.h> +/* Define this here to avoid referencing any drivers for the debug UART 1 */ +#define PCH_DEV_P2SB PCI_BDF(0, 0x0d, 0) + void cpu_flush_l1d_to_l2(void) { struct msr_t msr; @@ -40,3 +46,57 @@ void enable_pm_timer_emulation(const struct udevice *pmc) debug("PM timer %x %x\n", msr.hi, msr.lo); msr_write(MSR_EMULATE_PM_TIMER, msr); } + +static void pch_uart_init(void) +{ + /* + * Set up the pinmux so that the UART rx/tx signals are connected + * outside the SoC. + * + * There are about 500 lines of code required to program the GPIO + * configuration for the UARTs. But it boils down to four writes, and + * for the debug UART we want the minimum possible amount of code before + * the UART is running. So just add the magic writes here. See + * apl_hostbridge_early_init_pinctrl() for the full horror. + */ + if (PCI_FUNC(PCH_DEV_UART) == 1) { + writel(0x40000402, 0xd0c50650); + writel(0x3c47, 0xd0c50654); + writel(0x40000400, 0xd0c50658); + writel(0x3c48, 0xd0c5065c); + } else { /* UART2 */ + writel(0x40000402, 0xd0c50670); + writel(0x3c4b, 0xd0c50674); + writel(0x40000400, 0xd0c50678); + writel(0x3c4c, 0xd0c5067c); + } + +#ifdef CONFIG_DEBUG_UART + apl_uart_init(PCH_DEV_UART, CONFIG_DEBUG_UART_BASE); +#endif +} + +static void p2sb_enable_bar(ulong bar) +{ + /* Enable PCR Base address in PCH */ + pci_x86_write_config(PCH_DEV_P2SB, PCI_BASE_ADDRESS_0, bar, + PCI_SIZE_32); + pci_x86_write_config(PCH_DEV_P2SB, PCI_BASE_ADDRESS_1, 0, PCI_SIZE_32); + + /* Enable P2SB MSE */ + pci_x86_write_config(PCH_DEV_P2SB, PCI_COMMAND, + PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY, + PCI_SIZE_8); +} + +/* + * board_debug_uart_init() - Init the debug UART ready for use + * + * This is the minimum init needed to get the UART running. It avoids any + * drivers or complex code, so that the UART is running as soon as possible. + */ +void board_debug_uart_init(void) +{ + p2sb_enable_bar(IOMAP_P2SB_BAR); + pch_uart_init(); +} |