/* SPDX-License-Identifier: GPL-2.0-only */

#include <commonlib/helpers.h>
#include <arch/io.h>
#include <device/mmio.h>
#include <device/pci_ops.h>
#include <console/console.h>
#include <bootmode.h>
#include <delay.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <drivers/intel/gma/i915_reg.h>
#include <drivers/intel/gma/i915.h>
#include <drivers/intel/gma/libgfxinit.h>
#include <cpu/intel/haswell/haswell.h>
#include <drivers/intel/gma/opregion.h>
#include <southbridge/intel/lynxpoint/pch.h>
#include <types.h>

#include "chip.h"
#include "haswell.h"

struct gt_reg {
	u32 reg;
	u32 andmask;
	u32 ormask;
};

static const struct gt_reg haswell_gt_setup[] = {
	/* Enable Counters */
	{ 0x0a248, 0x00000000, 0x00000016 },
	{ 0x0a000, 0x00000000, 0x00070020 },
	{ 0x0a180, 0xff3fffff, 0x15000000 },
	/* Enable DOP Clock Gating */
	{ 0x09424, 0x00000000, 0x000003fd },
	/* Enable Unit Level Clock Gating */
	{ 0x09400, 0x00000000, 0x00000080 },
	{ 0x09404, 0x00000000, 0x40401000 },
	{ 0x09408, 0x00000000, 0x00000000 },
	{ 0x0940c, 0x00000000, 0x02000001 },
	{ 0x0a008, 0x00000000, 0x08000000 },
	/* Wake Rate Limits */
	{ 0x0a090, 0xffffffff, 0x00000000 },
	{ 0x0a098, 0xffffffff, 0x03e80000 },
	{ 0x0a09c, 0xffffffff, 0x00280000 },
	{ 0x0a0a8, 0xffffffff, 0x0001e848 },
	{ 0x0a0ac, 0xffffffff, 0x00000019 },
	/* Render/Video/Blitter Idle Max Count */
	{ 0x02054, 0x00000000, 0x0000000a },
	{ 0x12054, 0x00000000, 0x0000000a },
	{ 0x22054, 0x00000000, 0x0000000a },
	/* RC Sleep / RCx Thresholds */
	{ 0x0a0b0, 0xffffffff, 0x00000000 },
	{ 0x0a0b4, 0xffffffff, 0x000003e8 },
	{ 0x0a0b8, 0xffffffff, 0x0000c350 },
	/* RP Settings */
	{ 0x0a010, 0xffffffff, 0x000f4240 },
	{ 0x0a014, 0xffffffff, 0x12060000 },
	{ 0x0a02c, 0xffffffff, 0x0000e808 },
	{ 0x0a030, 0xffffffff, 0x0003bd08 },
	{ 0x0a068, 0xffffffff, 0x000101d0 },
	{ 0x0a06c, 0xffffffff, 0x00055730 },
	{ 0x0a070, 0xffffffff, 0x0000000a },
	/* RP Control */
	{ 0x0a024, 0x00000000, 0x00000b92 },
	/* HW RC6 Control */
	{ 0x0a090, 0x00000000, 0x88040000 },
	/* Video Frequency Request */
	{ 0x0a00c, 0x00000000, 0x08000000 },
	{ 0 },
};

static const struct gt_reg haswell_gt_lock[] = {
	{ 0x0a248, 0xffffffff, 0x80000000 },
	{ 0x0a004, 0xffffffff, 0x00000010 },
	{ 0x0a080, 0xffffffff, 0x00000004 },
	{ 0x0a180, 0xffffffff, 0x80000000 },
	{ 0 },
};

/*
 * Some VGA option roms are used for several chipsets but they only have one PCI ID in their
 * header. If we encounter such an option rom, we need to do the mapping ourselves.
 */

u32 map_oprom_vendev(u32 vendev)
{
	u32 new_vendev = vendev;

	switch (vendev) {
	case 0x80860402:		/* GT1 Desktop */
	case 0x80860406:		/* GT1 Mobile */
	case 0x8086040a:		/* GT1 Server */
	case 0x80860a06:		/* GT1 ULT */
	case 0x80860a0e:		/* GT1 ULX */

	case 0x80860412:		/* GT2 Desktop */
	case 0x80860416:		/* GT2 Mobile */
	case 0x8086041a:		/* GT2 Server */
	case 0x8086041e:		/* GT1.5 Desktop */
	case 0x80860a16:		/* GT2 ULT */
	case 0x80860a1e:		/* GT2 ULX */

	case 0x80860422:		/* GT3 Desktop */
	case 0x80860426:		/* GT3 Mobile */
	case 0x8086042a:		/* GT3 Server */
	case 0x80860a26:		/* GT3 ULT */

	case 0x80860d22:		/* GT3e Desktop */
	case 0x80860d16:		/* GT1 Mobile 4+3 */
	case 0x80860d26:		/* GT2 Mobile 4+3, GT3e Mobile */
	case 0x80860d36:		/* GT3 Mobile 4+3 */

		new_vendev = 0x80860406;	/* GT1 Mobile */
		break;
	}

	return new_vendev;
}

static struct resource *gtt_res = NULL;

u32 gtt_read(u32 reg)
{
	u32 val;
	val = read32(res2mmio(gtt_res, reg, 0));
	return val;
}

void gtt_write(u32 reg, u32 data)
{
	write32(res2mmio(gtt_res, reg, 0), data);
}

static inline void gtt_rmw(u32 reg, u32 andmask, u32 ormask)
{
	u32 val = gtt_read(reg);
	val &= andmask;
	val |= ormask;
	gtt_write(reg, val);
}

static inline void gtt_write_regs(const struct gt_reg *gt)
{
	for (; gt && gt->reg; gt++) {
		if (gt->andmask)
			gtt_rmw(gt->reg, gt->andmask, gt->ormask);
		else
			gtt_write(gt->reg, gt->ormask);
	}
}

#define GTT_RETRY 1000
int gtt_poll(u32 reg, u32 mask, u32 value)
{
	unsigned int try = GTT_RETRY;
	u32 data;

	while (try--) {
		data = gtt_read(reg);
		if ((data & mask) == value)
			return 1;

		udelay(10);
	}

	printk(BIOS_ERR, "GT init timeout\n");
	return 0;
}

static void power_well_enable(void)
{
	gtt_write(HSW_PWR_WELL_CTL1, HSW_PWR_WELL_ENABLE);
	gtt_poll(HSW_PWR_WELL_CTL1, HSW_PWR_WELL_STATE, HSW_PWR_WELL_STATE);
}

static void gma_pm_init_pre_vbios(struct device *dev)
{
	printk(BIOS_DEBUG, "GT Power Management Init\n");

	gtt_res = probe_resource(dev, PCI_BASE_ADDRESS_0);
	if (!gtt_res || !gtt_res->base)
		return;

	power_well_enable();

	/*
	 * Enable RC6
	 */

	/* Enable Force Wake */
	gtt_write(0x0a180, 1 << 5);
	gtt_write(0x0a188, 0x00010001);
	gtt_poll(FORCEWAKE_ACK_HSW, 1 << 0, 1 << 0);

	/* GT Settings */
	gtt_write_regs(haswell_gt_setup);

	/* Wait for Mailbox Ready */
	gtt_poll(0x138124, (1 << 31), (0 << 31));

	/* Mailbox Data - RC6 VIDS */
	gtt_write(0x138128, 0x00000000);

	/* Mailbox Command */
	gtt_write(0x138124, 0x80000004);

	/* Wait for Mailbox Ready */
	gtt_poll(0x138124, (1 << 31), (0 << 31));

	/* Enable PM Interrupts */
	gtt_write(GEN6_PMIER, GEN6_PM_MBOX_EVENT | GEN6_PM_THERMAL_EVENT |
		  GEN6_PM_RP_DOWN_TIMEOUT | GEN6_PM_RP_UP_THRESHOLD |
		  GEN6_PM_RP_DOWN_THRESHOLD | GEN6_PM_RP_UP_EI_EXPIRED |
		  GEN6_PM_RP_DOWN_EI_EXPIRED);

	/* Enable RC6 in idle */
	gtt_write(0x0a094, 0x00040000);

	/* PM Lock Settings */
	gtt_write_regs(haswell_gt_lock);
}

static void init_display_planes(void)
{
	int pipe, plane;

	/* Disable cursor mode */
	for (pipe = PIPE_A; pipe <= PIPE_C; pipe++) {
		gtt_write(CURCNTR_IVB(pipe), CURSOR_MODE_DISABLE);
		gtt_write(CURBASE_IVB(pipe), 0x00000000);
	}

	/* Disable primary plane and set surface base address */
	for (plane = PLANE_A; plane <= PLANE_C; plane++) {
		gtt_write(DSPCNTR(plane), DISPLAY_PLANE_DISABLE);
		gtt_write(DSPSURF(plane), 0x00000000);
	}

	/* Disable VGA display */
	gtt_write(CPU_VGACNTRL, CPU_VGA_DISABLE);
}

static void gma_setup_panel(struct device *dev)
{
	struct northbridge_intel_haswell_config *conf = config_of(dev);
	const struct i915_gpu_panel_config *panel_cfg = &conf->panel_cfg;
	u32 reg32;

	/* Setup Digital Port Hotplug */
	reg32 = gtt_read(PCH_PORT_HOTPLUG);
	if (!reg32) {
		reg32 = (conf->gpu_dp_b_hotplug & 0x7) << 2;
		reg32 |= (conf->gpu_dp_c_hotplug & 0x7) << 10;
		reg32 |= (conf->gpu_dp_d_hotplug & 0x7) << 18;
		gtt_write(PCH_PORT_HOTPLUG, reg32);
	}

	/* Setup Panel Power On Delays */
	reg32 = gtt_read(PCH_PP_ON_DELAYS);
	if (!reg32) {
		reg32 |= ((panel_cfg->up_delay_ms * 10) & 0x1fff) << 16;
		reg32 |= (panel_cfg->backlight_on_delay_ms * 10) & 0x1fff;
		gtt_write(PCH_PP_ON_DELAYS, reg32);
	}

	/* Setup Panel Power Off Delays */
	reg32 = gtt_read(PCH_PP_OFF_DELAYS);
	if (!reg32) {
		reg32 = ((panel_cfg->down_delay_ms * 10) & 0x1fff) << 16;
		reg32 |= (panel_cfg->backlight_off_delay_ms * 10) & 0x1fff;
		gtt_write(PCH_PP_OFF_DELAYS, reg32);
	}

	/* Setup Panel Power Cycle Delay */
	if (panel_cfg->cycle_delay_ms) {
		reg32 = gtt_read(PCH_PP_DIVISOR);
		reg32 &= ~0x1f;
		reg32 |= (DIV_ROUND_UP(panel_cfg->cycle_delay_ms, 100) + 1) & 0x1f;
		gtt_write(PCH_PP_DIVISOR, reg32);
	}

	/* Enforce the PCH PWM function, as so does Linux.
	   The CPU PWM controls are disabled after reset.  */
	if (panel_cfg->backlight_pwm_hz) {
		/* Reference clock is either 24MHz or 135MHz. We can choose
		   either a 16 or a 128 step increment. Use 16 if we would
		   have less than 100 steps otherwise. */
		const unsigned int refclock = CONFIG(INTEL_LYNXPOINT_LP) ? 24*MHz : 135*MHz;
		const unsigned int hz_limit = refclock / 128 / 100;
		unsigned int pwm_increment, pwm_period;
		u32 south_chicken2;

		south_chicken2 = gtt_read(SOUTH_CHICKEN2);
		if (panel_cfg->backlight_pwm_hz > hz_limit) {
			pwm_increment = 16;
			south_chicken2 |= LPT_PWM_GRANULARITY;
		} else {
			pwm_increment = 128;
			south_chicken2 &= ~LPT_PWM_GRANULARITY;
		}
		gtt_write(SOUTH_CHICKEN2, south_chicken2);

		pwm_period = refclock / pwm_increment / panel_cfg->backlight_pwm_hz;
		printk(BIOS_INFO,
			"GMA: Setting backlight PWM frequency to %uMHz / %u / %u = %uHz\n",
			refclock / MHz, pwm_increment, pwm_period,
			DIV_ROUND_CLOSEST(refclock, pwm_increment * pwm_period));

		/* Start with a 50% duty cycle. */
		gtt_write(BLC_PWM_PCH_CTL2, pwm_period << 16 | pwm_period / 2);

		gtt_write(BLC_PWM_PCH_CTL1,
			(panel_cfg->backlight_polarity == GPU_BACKLIGHT_POLARITY_LOW) << 29 |
			BLM_PCH_OVERRIDE_ENABLE | BLM_PCH_PWM_ENABLE);
	}

	/* Get display,pipeline,and DDI registers into a basic sane state */
	power_well_enable();

	init_display_planes();

	/*
	 * DDI-A params set:
	 * bit 0: Display detected (RO)
	 * bit 4: DDI A supports 4 lanes and DDI E is not used
	 * bit 7: DDI buffer is idle
	 */
	reg32 = DDI_BUF_IS_IDLE | DDI_INIT_DISPLAY_DETECTED;
	if (!conf->gpu_ddi_e_connected)
		reg32 |= DDI_A_4_LANES;
	gtt_write(DDI_BUF_CTL_A, reg32);

	/* Set FDI registers - is this required? */
	gtt_write(_FDI_RXA_MISC, 0x00200090);
	gtt_write(_FDI_RXA_MISC, 0x0a000000);

	/* Enable the handshake with PCH display when processing reset */
	gtt_write(NDE_RSTWRN_OPT, RST_PCH_HNDSHK_EN);

	/* Undocumented */
	gtt_write(0x42090, 0x04000000);
	gtt_write(0x9840,  0x00000000);
	gtt_write(0x42090, 0xa4000000);

	gtt_write(SOUTH_DSPCLK_GATE_D, PCH_LP_PARTITION_LEVEL_DISABLE);

	/* Undocumented */
	gtt_write(0x42080, 0x00004000);

	/* Prepare DDI buffers for DP and FDI */
	intel_prepare_ddi();

	/* Hot plug detect buffer enabled for port A */
	gtt_write(DIGITAL_PORT_HOTPLUG_CNTRL, DIGITAL_PORTA_HOTPLUG_ENABLE);

	/* Enable HPD buffer for digital port D and B */
	gtt_write(PCH_PORT_HOTPLUG, PORTD_HOTPLUG_ENABLE | PORTB_HOTPLUG_ENABLE);

	/*
	 * Bits 4:0 - Power cycle delay (default 0x6 --> 500ms)
	 * Bits 31:8 - Reference divider (0x0004af ----> 24MHz)
	 */
	gtt_write(PCH_PP_DIVISOR, 0x0004af06);
}

static void gma_pm_init_post_vbios(struct device *dev)
{
	int cdclk = 0;
	int devid = pci_read_config16(dev, PCI_DEVICE_ID);
	int gpu_is_ulx = 0;

	if (devid == 0x0a0e || devid == 0x0a1e)
		gpu_is_ulx = 1;

	/* CD Frequency */
	if ((gtt_read(0x42014) & 0x1000000) || gpu_is_ulx || haswell_is_ult())
		cdclk = 0; /* fixed frequency */
	else
		cdclk = 2; /* variable frequency */

	if (gpu_is_ulx || cdclk != 0)
		gtt_rmw(0x130040, 0xf7ffffff, 0x04000000);
	else
		gtt_rmw(0x130040, 0xf3ffffff, 0x00000000);

	/* More magic */
	if (haswell_is_ult() || gpu_is_ulx) {
		if (!gpu_is_ulx)
			gtt_write(0x138128, 0x00000000);
		else
			gtt_write(0x138128, 0x00000001);
		gtt_write(0x13812c, 0x00000000);
		gtt_write(0x138124, 0x80000017);
	}

	/* Disable Force Wake */
	gtt_write(0x0a188, 0x00010000);
	gtt_poll(FORCEWAKE_ACK_HSW, 1 << 0, 0 << 0);
	gtt_write(0x0a188, 0x00000001);
}

/* Enable SCI to ACPI _GPE._L06 */
static void gma_enable_swsci(void)
{
	u16 reg16;

	/* Clear DMISCI status */
	reg16 = inw(get_pmbase() + TCO1_STS);
	reg16 &= DMISCI_STS;
	outw(reg16, get_pmbase() + TCO1_STS);

	/* Clear and enable ACPI TCO SCI */
	enable_tco_sci();
}

static void gma_func0_init(struct device *dev)
{
	int lightup_ok = 0;

	intel_gma_init_igd_opregion();

	/* Init graphics power management */
	gma_pm_init_pre_vbios(dev);

	/* Pre panel init */
	gma_setup_panel(dev);

	if (!CONFIG(NO_GFX_INIT))
		pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_MASTER);

	int vga_disable = (pci_read_config16(dev, GGC) & 2) >> 1;

	if (CONFIG(MAINBOARD_USE_LIBGFXINIT)) {
		if (vga_disable) {
			printk(BIOS_INFO,
			       "IGD is not decoding legacy VGA MEM and IO: skipping NATIVE graphic init\n");
		} else {
			printk(BIOS_SPEW, "NATIVE graphics, run native enable\n");
			gma_gfxinit(&lightup_ok);
			gfx_set_init_done(1);
		}
	}

	if (!lightup_ok) {
		printk(BIOS_SPEW, "FUI did not run; using VBIOS\n");
		pci_dev_init(dev);
	}

	printk(BIOS_DEBUG, "GT Power Management Init (post VBIOS)\n");

	gma_pm_init_post_vbios(dev);

	gma_enable_swsci();
}

static void gma_generate_ssdt(const struct device *dev)
{
	const struct northbridge_intel_haswell_config *chip = dev->chip_info;

	drivers_intel_gma_displays_ssdt_generate(&chip->gfx);
}

static void gma_func0_disable(struct device *dev)
{
	/* Disable VGA decode */
	pci_or_config16(pcidev_on_root(0, 0), GGC, 1 << 1);
}

static struct device_operations gma_func0_ops = {
	.read_resources		= pci_dev_read_resources,
	.set_resources		= pci_dev_set_resources,
	.enable_resources	= pci_dev_enable_resources,
	.init			= gma_func0_init,
	.acpi_fill_ssdt		= gma_generate_ssdt,
	.vga_disable            = gma_func0_disable,
	.ops_pci		= &pci_dev_ops_pci,
};

static const unsigned short pci_device_ids[] = {
	0x0402, /* Desktop GT1 */
	0x0412, /* Desktop GT2 */
	0x041e, /* Desktop GT1.5 */
	0x0422, /* Desktop GT3 */
	0x0d22, /* Desktop GT3e */
	0x0406, /* Mobile GT1 */
	0x0416, /* Mobile GT2 */
	0x0426, /* Mobile GT3 */
	0x040a, /* Server GT1 */
	0x041a, /* Server GT2 */
	0x042a, /* Server GT3 */
	0x0d16, /* Mobile 4+3 GT1 */
	0x0d26, /* Mobile 4+3 GT2, Mobile GT3e */
	0x0d36, /* Mobile 4+3 GT3 */
	0x0a06, /* ULT GT1 */
	0x0a16, /* ULT GT2 */
	0x0a26, /* ULT GT3 */
	0x0a0e, /* ULX GT1 */
	0x0a1e, /* ULX GT2 */
	0,
};

static const struct pci_driver pch_lpc __pci_driver = {
	.ops     = &gma_func0_ops,
	.vendor  = PCI_VID_INTEL,
	.devices = pci_device_ids,
};