mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 02:51:00 +00:00
51de94dfe4
At present the debug UART is only set up in SPL, on the assumption that the boot flow will always pass through there. When booting from coreboot, SPL is not used, so the debug UART is not available. Move the code into a common place so that it can be used in U-Boot proper also. Add the required init to start_from_spl.S as well. Signed-off-by: Simon Glass <sjg@chromium.org>
102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2019 Google LLC
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*/
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#include <common.h>
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#include <dm.h>
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#include <log.h>
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#include <asm/cpu_common.h>
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#include <asm/io.h>
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#include <asm/msr.h>
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#include <asm/pci.h>
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#include <asm/arch/cpu.h>
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#include <asm/arch/iomap.h>
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#include <asm/arch/uart.h>
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#include <power/acpi_pmc.h>
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/* Define this here to avoid referencing any drivers for the debug UART 1 */
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#define PCH_DEV_P2SB PCI_BDF(0, 0x0d, 0)
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void cpu_flush_l1d_to_l2(void)
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{
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struct msr_t msr;
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msr = msr_read(MSR_POWER_MISC);
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msr.lo |= FLUSH_DL1_L2;
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msr_write(MSR_POWER_MISC, msr);
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}
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void enable_pm_timer_emulation(const struct udevice *pmc)
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{
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struct acpi_pmc_upriv *upriv = dev_get_uclass_priv(pmc);
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msr_t msr;
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/*
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* The derived frequency is calculated as follows:
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* (CTC_FREQ * msr[63:32]) >> 32 = target frequency.
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*
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* Back-solve the multiplier so the 3.579545MHz ACPI timer frequency is
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* used.
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*/
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msr.hi = (3579545ULL << 32) / CTC_FREQ;
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/* Set PM1 timer IO port and enable */
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msr.lo = EMULATE_PM_TMR_EN | (upriv->acpi_base + R_ACPI_PM1_TMR);
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debug("PM timer %x %x\n", msr.hi, msr.lo);
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msr_write(MSR_EMULATE_PM_TIMER, msr);
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}
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static void pch_uart_init(void)
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{
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/*
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* Set up the pinmux so that the UART rx/tx signals are connected
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* outside the SoC.
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*
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* There are about 500 lines of code required to program the GPIO
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* configuration for the UARTs. But it boils down to four writes, and
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* for the debug UART we want the minimum possible amount of code before
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* the UART is running. So just add the magic writes here. See
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* apl_hostbridge_early_init_pinctrl() for the full horror.
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*/
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if (PCI_FUNC(PCH_DEV_UART) == 1) {
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writel(0x40000402, 0xd0c50650);
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writel(0x3c47, 0xd0c50654);
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writel(0x40000400, 0xd0c50658);
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writel(0x3c48, 0xd0c5065c);
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} else { /* UART2 */
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writel(0x40000402, 0xd0c50670);
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writel(0x3c4b, 0xd0c50674);
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writel(0x40000400, 0xd0c50678);
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writel(0x3c4c, 0xd0c5067c);
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}
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#ifdef CONFIG_DEBUG_UART
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apl_uart_init(PCH_DEV_UART, CONFIG_DEBUG_UART_BASE);
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#endif
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}
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static void p2sb_enable_bar(ulong bar)
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{
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/* Enable PCR Base address in PCH */
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pci_x86_write_config(PCH_DEV_P2SB, PCI_BASE_ADDRESS_0, bar,
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PCI_SIZE_32);
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pci_x86_write_config(PCH_DEV_P2SB, PCI_BASE_ADDRESS_1, 0, PCI_SIZE_32);
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/* Enable P2SB MSE */
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pci_x86_write_config(PCH_DEV_P2SB, PCI_COMMAND,
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PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY,
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PCI_SIZE_8);
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}
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/*
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* board_debug_uart_init() - Init the debug UART ready for use
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*
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* This is the minimum init needed to get the UART running. It avoids any
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* drivers or complex code, so that the UART is running as soon as possible.
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*/
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void board_debug_uart_init(void)
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{
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p2sb_enable_bar(IOMAP_P2SB_BAR);
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pch_uart_init();
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}
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