--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 Google LLC
+ *
+ * Portions taken from coreboot
+ */
+
+#include <common.h>
+#include <acpi_s3.h>
+#include <dm.h>
+#include <ec_commands.h>
+#include <log.h>
+#include <spi_flash.h>
+#include <spl.h>
+#include <syscon.h>
+#include <asm/cpu.h>
+#include <asm/cpu_common.h>
+#include <asm/cpu_x86.h>
+#include <asm/fast_spi.h>
+#include <asm/intel_pinctrl.h>
+#include <asm/intel_regs.h>
+#include <asm/io.h>
+#include <asm/msr.h>
+#include <asm/mtrr.h>
+#include <asm/pci.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/gpio.h>
+#include <asm/arch/iomap.h>
+#include <asm/arch/lpc.h>
+#include <asm/arch/pch.h>
+#include <asm/arch/systemagent.h>
+#include <asm/arch/uart.h>
+#include <asm/fsp2/fsp_api.h>
+#include <linux/sizes.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)
+
+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();
+}
+
+static int fast_spi_cache_bios_region(void)
+{
+ uint map_size, offset;
+ ulong map_base, base;
+ int ret;
+
+ ret = fast_spi_early_init(PCH_DEV_SPI, IOMAP_SPI_BASE);
+ if (ret)
+ return log_msg_ret("early_init", ret);
+
+ ret = fast_spi_get_bios_mmap(PCH_DEV_SPI, &map_base, &map_size,
+ &offset);
+ if (ret)
+ return log_msg_ret("get_mmap", ret);
+
+ base = SZ_4G - map_size;
+ mtrr_set_next_var(MTRR_TYPE_WRPROT, base, map_size);
+ log_debug("BIOS cache base=%lx, size=%x\n", base, (uint)map_size);
+
+ return 0;
+}
+
+static void enable_pm_timer_emulation(struct udevice *pmc)
+{
+ struct acpi_pmc_upriv *upriv = dev_get_uclass_priv(pmc);
+ msr_t msr;
+
+ /*
+ * The derived frequency is calculated as follows:
+ * (CTC_FREQ * msr[63:32]) >> 32 = target frequency.
+ *
+ * Back-solve the multiplier so the 3.579545MHz ACPI timer frequency is
+ * used.
+ */
+ msr.hi = (3579545ULL << 32) / CTC_FREQ;
+
+ /* Set PM1 timer IO port and enable */
+ msr.lo = EMULATE_PM_TMR_EN | (upriv->acpi_base + R_ACPI_PM1_TMR);
+ debug("PM timer %x %x\n", msr.hi, msr.lo);
+ msr_write(MSR_EMULATE_PM_TIMER, msr);
+}
+
+static void google_chromeec_ioport_range(uint *out_basep, uint *out_sizep)
+{
+ uint base;
+ uint size;
+
+ if (IS_ENABLED(CONFIG_EC_GOOGLE_CHROMEEC_MEC)) {
+ base = MEC_EMI_BASE;
+ size = MEC_EMI_SIZE;
+ } else {
+ base = EC_HOST_CMD_REGION0;
+ size = 2 * EC_HOST_CMD_REGION_SIZE;
+ /* Make sure MEMMAP region follows host cmd region */
+ assert(base + size == EC_LPC_ADDR_MEMMAP);
+ size += EC_MEMMAP_SIZE;
+ }
+
+ *out_basep = base;
+ *out_sizep = size;
+}
+
+static void early_ec_init(void)
+{
+ uint base, size;
+
+ /*
+ * Set up LPC decoding for the Chrome OS EC I/O port ranges:
+ * - Ports 62/66, 60/64, and 200->208
+ * - Chrome OS EC communication I/O ports
+ */
+ lpc_enable_fixed_io_ranges(LPC_IOE_EC_62_66 | LPC_IOE_KBC_60_64 |
+ LPC_IOE_LGE_200);
+ google_chromeec_ioport_range(&base, &size);
+ lpc_open_pmio_window(base, size);
+}
+
+static int arch_cpu_init_tpl(void)
+{
+ struct udevice *pmc, *sa, *p2sb, *serial, *spi, *lpc;
+ int ret;
+
+ ret = uclass_first_device_err(UCLASS_ACPI_PMC, &pmc);
+ if (ret)
+ return log_msg_ret("PMC", ret);
+
+ /* Clear global reset promotion bit */
+ ret = pmc_global_reset_set_enable(pmc, false);
+ if (ret)
+ return log_msg_ret("disable global reset", ret);
+
+ enable_pm_timer_emulation(pmc);
+
+ ret = uclass_first_device_err(UCLASS_P2SB, &p2sb);
+ if (ret)
+ return log_msg_ret("p2sb", ret);
+ ret = uclass_first_device_err(UCLASS_NORTHBRIDGE, &sa);
+ if (ret)
+ return log_msg_ret("northbridge", ret);
+ gd->baudrate = CONFIG_BAUDRATE;
+ ret = uclass_first_device_err(UCLASS_SERIAL, &serial);
+ if (ret)
+ return log_msg_ret("serial", ret);
+ if (CONFIG_IS_ENABLED(SPI_FLASH_SUPPORT)) {
+ ret = uclass_first_device_err(UCLASS_SPI, &spi);
+ if (ret)
+ return log_msg_ret("SPI", ret);
+ } else {
+ /* Alternative code if we don't have SPI in TPL */
+ if (IS_ENABLED(CONFIG_APL_BOOT_FROM_FAST_SPI_FLASH))
+ printf("Warning: Enable APL_SPI_FLASHBOOT to use SPI-flash driver in TPL");
+ ret = fast_spi_cache_bios_region();
+ if (ret)
+ return log_msg_ret("BIOS cache", ret);
+ }
+ ret = pmc_disable_tco(pmc);
+ if (ret)
+ return log_msg_ret("disable TCO", ret);
+ ret = pmc_gpe_init(pmc);
+ if (ret)
+ return log_msg_ret("pmc_gpe", ret);
+ ret = uclass_first_device_err(UCLASS_LPC, &lpc);
+ if (ret)
+ return log_msg_ret("lpc", ret);
+
+ early_ec_init();
+
+ return 0;
+}
+
+/*
+ * Enables several BARs and devices which are needed for memory init
+ * - MCH_BASE_ADDR is needed in order to talk to the memory controller
+ * - HPET is enabled because FSP wants to store a pointer to global data in the
+ * HPET comparator register
+ */
+static int arch_cpu_init_spl(void)
+{
+ struct udevice *pmc, *p2sb;
+ int ret;
+
+ ret = uclass_first_device_err(UCLASS_ACPI_PMC, &pmc);
+ if (ret)
+ return log_msg_ret("Could not probe PMC", ret);
+ ret = uclass_first_device_err(UCLASS_P2SB, &p2sb);
+ if (ret)
+ return log_msg_ret("Cannot set up p2sb", ret);
+
+ lpc_io_setup_comm_a_b();
+
+ /* TODO(sjg@chromium.org): Enable upper RTC bank here */
+
+ ret = pmc_init(pmc);
+ if (ret < 0)
+ return log_msg_ret("Could not init PMC", ret);
+#ifdef CONFIG_HAVE_ACPI_RESUME
+ ret = pmc_prev_sleep_state(pmc);
+ if (ret < 0)
+ return log_msg_ret("Could not get PMC sleep state", ret);
+ gd->arch.prev_sleep_state = ret;
+#endif
+
+ return 0;
+}
+
+int arch_cpu_init(void)
+{
+ int ret = 0;
+
+ if (spl_phase() == PHASE_TPL)
+ ret = arch_cpu_init_tpl();
+ else if (spl_phase() == PHASE_SPL)
+ ret = arch_cpu_init_spl();
+ if (ret)
+ printf("%s: Error %d\n", __func__, ret);
+
+ return ret;
+}
projects / oweals / u-boot.git / commitdiff