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

#include <device/mmio.h>
#include <device/pci_ops.h>
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <delay.h>
#include "chip.h"
#include "pch.h"

typedef struct southbridge_intel_lynxpoint_config config_t;

static inline u32 sir_read(struct device *dev, int idx)
{
	pci_write_config32(dev, SATA_SIRI, idx);
	return pci_read_config32(dev, SATA_SIRD);
}

static inline void sir_write(struct device *dev, int idx, u32 value)
{
	pci_write_config32(dev, SATA_SIRI, idx);
	pci_write_config32(dev, SATA_SIRD, value);
}

static void sata_init(struct device *dev)
{
	u32 reg32;
	u16 reg16;
	/* Get the chip configuration */
	config_t *config = dev->chip_info;

	printk(BIOS_DEBUG, "SATA: Initializing...\n");

	if (config == NULL) {
		printk(BIOS_ERR, "SATA: ERROR: Device not in devicetree.cb!\n");
		return;
	}

	/* SATA configuration */

	/* Enable BARs */
	pci_write_config16(dev, PCI_COMMAND,
			   PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY | PCI_COMMAND_IO);

	if (config->ide_legacy_combined) {
		printk(BIOS_DEBUG, "SATA: Controller in combined mode.\n");

		/* No AHCI: clear AHCI base */
		pci_write_config32(dev, 0x24, 0);

		/* And without AHCI BAR no memory decoding */
		pci_and_config16(dev, PCI_COMMAND, ~PCI_COMMAND_MEMORY);

		pci_write_config8(dev, 0x09, 0x80);

		/* Set timings */
		pci_write_config16(dev, IDE_TIM_PRI, IDE_DECODE_ENABLE |
				IDE_ISP_5_CLOCKS | IDE_RCT_4_CLOCKS);
		pci_write_config16(dev, IDE_TIM_SEC, IDE_DECODE_ENABLE |
				IDE_ISP_3_CLOCKS | IDE_RCT_1_CLOCKS |
				IDE_PPE0 | IDE_IE0 | IDE_TIME0);

		/* Sync DMA */
		pci_write_config16(dev, IDE_SDMA_CNT, IDE_SSDE0);
		pci_write_config16(dev, IDE_SDMA_TIM, 0x0200);

		/* Set IDE I/O Configuration */
		reg32 = SIG_MODE_PRI_NORMAL | FAST_PCB1 | FAST_PCB0 | PCB1 | PCB0;
		pci_write_config32(dev, IDE_CONFIG, reg32);

		/* Port enable */
		reg16 = pci_read_config16(dev, 0x92);
		reg16 &= ~0x3f;
		reg16 |= config->sata_port_map;
		pci_write_config16(dev, 0x92, reg16);

		/* SATA Initialization register */
		pci_write_config32(dev, 0x94, ((config->sata_port_map ^ 0x3f) << 24) | 0x183);
	} else if (config->sata_ahci) {
		u32 *abar;

		printk(BIOS_DEBUG, "SATA: Controller in AHCI mode.\n");

		/* Set Interrupt Line */
		/* Interrupt Pin is set by D31IP.PIP */
		pci_write_config8(dev, INTR_LN, 0x0a);

		/* Set timings */
		pci_write_config16(dev, IDE_TIM_PRI, IDE_DECODE_ENABLE |
				IDE_ISP_3_CLOCKS | IDE_RCT_1_CLOCKS |
				IDE_PPE0 | IDE_IE0 | IDE_TIME0);
		pci_write_config16(dev, IDE_TIM_SEC, IDE_DECODE_ENABLE |
				IDE_ISP_5_CLOCKS | IDE_RCT_4_CLOCKS);

		/* Sync DMA */
		pci_write_config16(dev, IDE_SDMA_CNT, IDE_PSDE0);
		pci_write_config16(dev, IDE_SDMA_TIM, 0x0001);

		/* Set IDE I/O Configuration */
		reg32 = SIG_MODE_PRI_NORMAL | FAST_PCB1 | FAST_PCB0 | PCB1 | PCB0;
		pci_write_config32(dev, IDE_CONFIG, reg32);

		/* for AHCI, Port Enable is managed in memory mapped space */
		reg16 = pci_read_config16(dev, 0x92);
		reg16 &= ~0x3f;
		reg16 |= 0x8000 | config->sata_port_map;
		pci_write_config16(dev, 0x92, reg16);
		udelay(2);

		/* Setup register 98h */
		reg32 = pci_read_config16(dev, 0x98);
		reg32 |= 1 << 19;    /* BWG step 6 */
		reg32 |= 1 << 22;    /* BWG step 5 */
		reg32 &= ~(0x3f << 7);
		reg32 |= 0x04 << 7;  /* BWG step 7 */
		reg32 |= 1 << 20;    /* BWG step 8 */
		reg32 &= ~(0x03 << 5);
		reg32 |= 1 << 5;     /* BWG step 9 */
		reg32 |= 1 << 18;    /* BWG step 10 */
		reg32 |= 1 << 29;    /* BWG step 11 */
		if (pch_is_lp()) {
			reg32 &= ~((1UL << 31) | (1 << 30));
			reg32 |= 1 << 23;
			reg32 |= 1 << 24; /* Disable listen mode (hotplug) */
		}
		pci_write_config32(dev, 0x98, reg32);

		/* Setup register 9Ch: Disable alternate ID and BWG step 12 */
		pci_write_config16(dev, 0x9c, 1 << 5);

		/* SATA Initialization register */
		reg32 = 0x183;
		reg32 |= (config->sata_port_map ^ 0x3f) << 24;
		reg32 |= (config->sata_devslp_mux & 1) << 15;
		pci_write_config32(dev, 0x94, reg32);

		/* Initialize AHCI memory-mapped space */
		abar = (u32 *)pci_read_config32(dev, PCI_BASE_ADDRESS_5);
		printk(BIOS_DEBUG, "ABAR: %p\n", abar);
		/* CAP (HBA Capabilities) : enable power management */
		reg32 = read32(abar + 0x00);
		reg32 |= 0x0c006000;  // set PSC+SSC+SALP+SSS
		reg32 &= ~0x00020060; // clear SXS+EMS+PMS
		if (pch_is_lp())
			reg32 |= (1 << 18);   // SAM: SATA AHCI MODE ONLY
		write32(abar + 0x00, reg32);
		/* PI (Ports implemented) */
		write32(abar + 0x03, config->sata_port_map);
		(void) read32(abar + 0x03); /* Read back 1 */
		(void) read32(abar + 0x03); /* Read back 2 */
		/* CAP2 (HBA Capabilities Extended)*/
		reg32 = read32(abar + 0x09);
		/* Enable DEVSLP */
		if (pch_is_lp()) {
			if (config->sata_devslp_disable)
				reg32 &= ~(1 << 3);
			else
				reg32 |= (1 << 5)|(1 << 4)|(1 << 3)|(1 << 2);
		} else {
			reg32 &= ~0x00000002;
		}
		write32(abar + 0x09, reg32);
	} else {
		printk(BIOS_DEBUG, "SATA: Controller in plain mode.\n");

		/* No AHCI: clear AHCI base */
		pci_write_config32(dev, 0x24, 0);

		/* And without AHCI BAR no memory decoding */
		pci_and_config16(dev, PCI_COMMAND, ~PCI_COMMAND_MEMORY);

		/*
		 * Native mode capable on both primary and secondary (0xa)
		 * or'ed with enabled (0x50) = 0xf
		 *
		 * FIXME: Does not match the code.
		 */
		pci_write_config8(dev, 0x09, 0x8f);

		/* Set Interrupt Line */
		/* Interrupt Pin is set by D31IP.PIP */
		pci_write_config8(dev, INTR_LN, 0xff);

		/* Set timings */
		pci_write_config16(dev, IDE_TIM_PRI, IDE_DECODE_ENABLE |
				IDE_ISP_3_CLOCKS | IDE_RCT_1_CLOCKS |
				IDE_PPE0 | IDE_IE0 | IDE_TIME0);
		pci_write_config16(dev, IDE_TIM_SEC, IDE_DECODE_ENABLE |
				IDE_SITRE | IDE_ISP_3_CLOCKS |
				IDE_RCT_1_CLOCKS | IDE_IE0 | IDE_TIME0);

		/* Sync DMA */
		pci_write_config16(dev, IDE_SDMA_CNT, IDE_SSDE0 | IDE_PSDE0);
		pci_write_config16(dev, IDE_SDMA_TIM, 0x0201);

		/* Set IDE I/O Configuration */
		reg32 = SIG_MODE_PRI_NORMAL | FAST_PCB1 | FAST_PCB0 | PCB1 | PCB0;
		pci_write_config32(dev, IDE_CONFIG, reg32);

		/* Port enable */
		reg16 = pci_read_config16(dev, 0x92);
		reg16 &= ~0x3f;
		reg16 |= config->sata_port_map;
		pci_write_config16(dev, 0x92, reg16);

		/* SATA Initialization register */
		pci_write_config32(dev, 0x94, ((config->sata_port_map ^ 0x3f) << 24) | 0x183);
	}

	/* Set Gen3 Transmitter settings if needed */
	if (config->sata_port0_gen3_tx)
		pch_iobp_update(SATA_IOBP_SP0G3IR, 0,
				config->sata_port0_gen3_tx);

	if (config->sata_port1_gen3_tx)
		pch_iobp_update(SATA_IOBP_SP1G3IR, 0,
				config->sata_port1_gen3_tx);

	/* Set Gen3 DTLE DATA / EDGE registers if needed */
	if (config->sata_port0_gen3_dtle) {
		pch_iobp_update(SATA_IOBP_SP0DTLE_DATA,
				~(SATA_DTLE_MASK << SATA_DTLE_DATA_SHIFT),
				(config->sata_port0_gen3_dtle & SATA_DTLE_MASK)
				<< SATA_DTLE_DATA_SHIFT);

		pch_iobp_update(SATA_IOBP_SP0DTLE_EDGE,
				~(SATA_DTLE_MASK << SATA_DTLE_EDGE_SHIFT),
				(config->sata_port0_gen3_dtle & SATA_DTLE_MASK)
				<< SATA_DTLE_EDGE_SHIFT);
	}

	if (config->sata_port1_gen3_dtle) {
		pch_iobp_update(SATA_IOBP_SP1DTLE_DATA,
				~(SATA_DTLE_MASK << SATA_DTLE_DATA_SHIFT),
				(config->sata_port1_gen3_dtle & SATA_DTLE_MASK)
				<< SATA_DTLE_DATA_SHIFT);

		pch_iobp_update(SATA_IOBP_SP1DTLE_EDGE,
				~(SATA_DTLE_MASK << SATA_DTLE_EDGE_SHIFT),
				(config->sata_port1_gen3_dtle & SATA_DTLE_MASK)
				<< SATA_DTLE_EDGE_SHIFT);
	}

	/* Additional Programming Requirements */
	/* Power Optimizer */

	/* Step 1 */
	if (pch_is_lp())
		sir_write(dev, 0x64, 0x883c9003);
	else
		sir_write(dev, 0x64, 0x883c9001);

	/* Step 2: SIR 68h[15:0] = 880Ah */
	reg32 = sir_read(dev, 0x68);
	reg32 &= 0xffff0000;
	reg32 |= 0x880a;
	sir_write(dev, 0x68, reg32);

	/* Step 3: SIR 60h[3] = 1 */
	reg32 = sir_read(dev, 0x60);
	reg32 |= (1 << 3);
	sir_write(dev, 0x60, reg32);

	/* Step 4: SIR 60h[0] = 1 */
	reg32 = sir_read(dev, 0x60);
	reg32 |= (1 << 0);
	sir_write(dev, 0x60, reg32);

	/* Step 5: SIR 60h[1] = 1 */
	reg32 = sir_read(dev, 0x60);
	reg32 |= (1 << 1);
	sir_write(dev, 0x60, reg32);

	/* Clock Gating */
	sir_write(dev, 0x70, 0x3f00bf1f);
	if (pch_is_lp()) {
		sir_write(dev, 0x54, 0xcf000f0f);
		sir_write(dev, 0x58, 0x00190000);
	}

	reg32 = pci_read_config32(dev, 0x300);
	reg32 |= (1 << 17) | (1 << 16);
	reg32 |= (1UL << 31) | (1 << 30) | (1 << 29);
	pci_write_config32(dev, 0x300, reg32);
}

static void sata_enable(struct device *dev)
{
	/* Get the chip configuration */
	config_t *config = dev->chip_info;
	u16 map = 0;

	if (!config)
		return;

	/*
	 * Set SATA controller mode early so the resource allocator can
	 * properly assign IO/Memory resources for the controller.
	 */
	if (config->sata_ahci)
		map = 0x0060;

	map |= (config->sata_port_map ^ 0x3f) << 8;

	pci_write_config16(dev, 0x90, map);
}

static struct device_operations sata_ops = {
	.read_resources		= pci_dev_read_resources,
	.set_resources		= pci_dev_set_resources,
	.enable_resources	= pci_dev_enable_resources,
	.init			= sata_init,
	.enable			= sata_enable,
	.ops_pci		= &pci_dev_ops_pci,
};

static const unsigned short pci_device_ids[] = {
	0x8c00, 0x8c02, 0x8c04, 0x8c06, 0x8c08, 0x8c0e, /* Desktop */
	0x8c01, 0x8c03, 0x8c05, 0x8c07, 0x8c09, 0x8c0f, /* Mobile */
	0x9c03, 0x9c05, 0x9c07, 0x9c0f,                 /* Low Power */
	0
};

static const struct pci_driver pch_sata __pci_driver = {
	.ops	 = &sata_ops,
	.vendor	 = PCI_VENDOR_ID_INTEL,
	.devices = pci_device_ids,
};