src/soc/intel/apollolake/acpi.c

/* SPDX-License-Identifier: GPL-2.0-or-later */

#include <acpi/acpi.h>
#include <acpi/acpi_gnvs.h>
#include <acpi/acpigen.h>
#include <console/console.h>
#include <device/device.h>
#include <device/mmio.h>
#include <arch/smp/mpspec.h>
#include <assert.h>
#include <device/pci_ops.h>
#include <gpio.h>
#include <intelblocks/acpi.h>
#include <intelblocks/pmclib.h>
#include <intelblocks/p2sb.h>
#include <soc/iomap.h>
#include <soc/pm.h>
#include <soc/nvs.h>
#include <soc/pci_devs.h>
#include <soc/systemagent.h>

#include "chip.h"

#define CSTATE_RES(address_space, width, offset, address)		\
	{								\
	.space_id = address_space,					\
	.bit_width = width,						\
	.bit_offset = offset,						\
	.addrl = address,						\
	}

static const acpi_cstate_t cstate_map[] = {
	{
		/* C1 */
		.ctype = 1,		/* ACPI C1 */
		.latency = 1,
		.power = 1000,
		.resource = CSTATE_RES(ACPI_ADDRESS_SPACE_FIXED, 0, 0, 0),
	},
	{
		.ctype = 2,		/* ACPI C2 */
		.latency = 50,
		.power = 10,
		.resource = CSTATE_RES(ACPI_ADDRESS_SPACE_IO, 8, 0, 0x415),
	},
	{
		.ctype = 3,		/* ACPI C3 */
		.latency = 150,
		.power = 10,
		.resource = CSTATE_RES(ACPI_ADDRESS_SPACE_IO, 8, 0, 0x419),
	}
};

uint32_t soc_read_sci_irq_select(void)
{
	return read32p(soc_read_pmc_base() + IRQ_REG);
}

void soc_write_sci_irq_select(uint32_t scis)
{
	write32p(soc_read_pmc_base() + IRQ_REG, scis);
}

const acpi_cstate_t *soc_get_cstate_map(size_t *entries)
{
	*entries = ARRAY_SIZE(cstate_map);
	return cstate_map;
}

void soc_fill_gnvs(struct global_nvs *gnvs)
{
	struct soc_intel_apollolake_config *cfg;
	cfg = config_of_soc();

	/* Enable DPTF based on mainboard configuration */
	gnvs->dpte = cfg->dptf_enable;

	/* Assign address of PERST_0 if GPIO is defined in devicetree */
	if (cfg->prt0_gpio != GPIO_PRT0_UDEF)
		gnvs->prt0 = (uintptr_t) gpio_dwx_address(cfg->prt0_gpio);

	/* Get sdcard cd GPIO portid if GPIO is defined in devicetree.
	 * Get offset of sdcard cd pin.
	 */
	if (cfg->sdcard_cd_gpio) {
		gnvs->scdp = gpio_get_pad_portid(cfg->sdcard_cd_gpio);
		gnvs->scdo = gpio_acpi_pin(cfg->sdcard_cd_gpio);
	}
}

int soc_madt_sci_irq_polarity(int sci)
{
	return MP_IRQ_POLARITY_LOW;
}

void soc_fill_fadt(acpi_fadt_t *fadt)
{
	const struct soc_intel_apollolake_config *cfg;
	cfg = config_of_soc();

	fadt->pm_tmr_blk = ACPI_BASE_ADDRESS + PM1_TMR;

	fadt->pm_tmr_len = 4;

	fadt->iapc_boot_arch = ACPI_FADT_LEGACY_DEVICES | ACPI_FADT_8042;

	fadt->x_pm_tmr_blk.space_id = ACPI_ADDRESS_SPACE_IO;
	fadt->x_pm_tmr_blk.bit_width = fadt->pm_tmr_len * 8;
	fadt->x_pm_tmr_blk.addrl = ACPI_BASE_ADDRESS + PM1_TMR;
	fadt->x_pm_tmr_blk.access_size = ACPI_ACCESS_SIZE_DWORD_ACCESS;

	if (cfg->lpss_s0ix_enable)
		fadt->flags |= ACPI_FADT_LOW_PWR_IDLE_S0;
}

static unsigned long soc_fill_dmar(unsigned long current)
{
	uint64_t gfxvtbar = MCHBAR64(GFXVTBAR) & VTBAR_MASK;
	uint64_t defvtbar = MCHBAR64(DEFVTBAR) & VTBAR_MASK;
	bool gfxvten = MCHBAR32(GFXVTBAR) & VTBAR_ENABLED;
	bool defvten = MCHBAR32(DEFVTBAR) & VTBAR_ENABLED;
	unsigned long tmp;

	/* IGD has to be enabled, GFXVTBAR set and enabled. */
	const bool emit_igd = is_devfn_enabled(SA_DEVFN_IGD) && gfxvtbar && gfxvten;

	/* First, add DRHD entries */
	if (emit_igd) {
		tmp = current;

		current += acpi_create_dmar_drhd(current, 0, 0, gfxvtbar);
		current += acpi_create_dmar_ds_pci(current, 0, 2, 0);
		acpi_dmar_drhd_fixup(tmp, current);
	}

	/* DEFVTBAR has to be set and enabled. */
	if (defvtbar && defvten) {
		tmp = current;
		union p2sb_bdf ibdf = p2sb_get_ioapic_bdf();
		union p2sb_bdf hbdf = p2sb_get_hpet_bdf();
		p2sb_hide();

		current += acpi_create_dmar_drhd(current,
				DRHD_INCLUDE_PCI_ALL, 0, defvtbar);
		current += acpi_create_dmar_ds_ioapic(current,
				2, ibdf.bus, ibdf.dev, ibdf.fn);
		current += acpi_create_dmar_ds_msi_hpet(current,
				0, hbdf.bus, hbdf.dev, hbdf.fn);
		acpi_dmar_drhd_fixup(tmp, current);
	}

	/* Then, add RMRR entries after all DRHD entries */
	if (emit_igd) {
		tmp = current;
		current += acpi_create_dmar_rmrr(current, 0,
				sa_get_gsm_base(), sa_get_tolud_base() - 1);
		current += acpi_create_dmar_ds_pci(current, 0, 2, 0);
		acpi_dmar_rmrr_fixup(tmp, current);
	}

	return current;
}

unsigned long sa_write_acpi_tables(const struct device *const dev,
				     unsigned long current,
				     struct acpi_rsdp *const rsdp)
{
	acpi_dmar_t *const dmar = (acpi_dmar_t *)current;

	/* Create DMAR table only if virtualization is enabled. Due to some
	 * constraints on Apollo Lake SoC (some stepping affected), VTD could
	 * not be enabled together with IPU. Doing so will override and disable
	 * VTD while leaving CAPID0_A still reporting that VTD is available.
	 * As in this case FSP will lock VTD to disabled state, we need to make
	 * sure that DMAR table generation only happens when at least DEFVTBAR
	 * is enabled. Otherwise the DMAR header will be generated while the
	 * content of the table will be missing.
	 */

	if ((pci_read_config32(dev, CAPID0_A) & VTD_DISABLE) ||
	    !(MCHBAR32(DEFVTBAR) & VTBAR_ENABLED))
		return current;

	printk(BIOS_DEBUG, "ACPI:    * DMAR\n");
	acpi_create_dmar(dmar, DMAR_INTR_REMAP, soc_fill_dmar);
	current += dmar->header.length;
	current = acpi_align_current(current);
	acpi_add_table(rsdp, dmar);
	current = acpi_align_current(current);

	return current;
}

void soc_power_states_generation(int core_id, int cores_per_package)
{
	/* Generate P-state tables */
	generate_p_state_entries(core_id, cores_per_package);

	/* Generate T-state tables */
	generate_t_state_entries(core_id, cores_per_package);
}

static void acpigen_soc_get_dw0_in_local5(uintptr_t addr)
{
	/*
	 * Store (\_SB.GPC0 (addr), Local5)
	 * \_SB.GPC0 is used to read cfg0 value from dw0. It is defined in
	 * gpiolib.asl.
	 */
	acpigen_write_store();
	acpigen_emit_namestring("\\_SB.GPC0");
	acpigen_write_integer(addr);
	acpigen_emit_byte(LOCAL5_OP);
}

static int acpigen_soc_get_gpio_val(unsigned int gpio_num, uint32_t mask)
{
	assert(gpio_num < TOTAL_PADS);
	uintptr_t addr = (uintptr_t) gpio_dwx_address(gpio_num);

	acpigen_soc_get_dw0_in_local5(addr);

	/* If (And (Local5, mask)) */
	acpigen_write_if_and(LOCAL5_OP, mask);

	/* Store (One, Local0) */
	acpigen_write_store_ops(ONE_OP, LOCAL0_OP);

	/* Else */
	acpigen_write_else();

	/* Store (Zero, Local0) */
	acpigen_write_store_ops(ZERO_OP, LOCAL0_OP);

	acpigen_pop_len();	/* Else */

	return 0;
}

static int acpigen_soc_set_gpio_val(unsigned int gpio_num, uint32_t val)
{
	assert(gpio_num < TOTAL_PADS);
	uintptr_t addr = (uintptr_t) gpio_dwx_address(gpio_num);

	acpigen_soc_get_dw0_in_local5(addr);

	if (val) {
		/* Or (Local5, PAD_CFG0_TX_STATE, Local5) */
		acpigen_write_or(LOCAL5_OP, PAD_CFG0_TX_STATE, LOCAL5_OP);
	} else {
		/* Not (PAD_CFG0_TX_STATE, Local6) */
		acpigen_write_not(PAD_CFG0_TX_STATE, LOCAL6_OP);

		/* And (Local5, Local6, Local5) */
		acpigen_write_and(LOCAL5_OP, LOCAL6_OP, LOCAL5_OP);
	}

	/*
	 * \_SB.SPC0 (addr, Local5)
	 * \_SB.SPC0 is used to write cfg0 value in dw0. It is defined in
	 * gpiolib.asl.
	 */
	acpigen_emit_namestring("\\_SB.SPC0");
	acpigen_write_integer(addr);
	acpigen_emit_byte(LOCAL5_OP);

	return 0;
}

int acpigen_soc_read_rx_gpio(unsigned int gpio_num)
{
	return acpigen_soc_get_gpio_val(gpio_num, PAD_CFG0_RX_STATE);
}

int acpigen_soc_get_tx_gpio(unsigned int gpio_num)
{
	return acpigen_soc_get_gpio_val(gpio_num, PAD_CFG0_TX_STATE);
}

int acpigen_soc_set_tx_gpio(unsigned int gpio_num)
{
	return acpigen_soc_set_gpio_val(gpio_num, 1);
}

int acpigen_soc_clear_tx_gpio(unsigned int gpio_num)
{
	return acpigen_soc_set_gpio_val(gpio_num, 0);
}