/*
 * Copyright 2011-2014 Freescale Semiconductor, Inc.
 * Copyright 2011 Linaro Ltd.
 *
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#include <linux/can/platform/flexcan.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/clocksource.h>
#include <linux/cpu.h>
#include <linux/export.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_gpio.h>
#include <linux/of_platform.h>
#include <linux/opp.h>
#include <linux/phy.h>
#include <linux/regmap.h>
#include <linux/micrel_phy.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
#include <linux/of_net.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/system_misc.h>

#include "common.h"
#include "cpuidle.h"
#include "hardware.h"

static struct flexcan_platform_data flexcan_pdata[2];
static int flexcan_en_gpio;
static int flexcan_stby_gpio;
static int flexcan0_en;
static int flexcan1_en;
static void mx6q_flexcan_switch(void)
{
	if (flexcan0_en || flexcan1_en) {
		/*
		 * The transceiver TJA1041A on sabreauto RevE baseboard will
		 * fail to transit to Normal state if EN/STBY is high by default
		 * after board power up. So we set the EN/STBY initial state to low
		 * first then to high to guarantee the state transition successfully.
		 */
		gpio_set_value_cansleep(flexcan_en_gpio, 0);
		gpio_set_value_cansleep(flexcan_stby_gpio, 0);

		gpio_set_value_cansleep(flexcan_en_gpio, 1);
		gpio_set_value_cansleep(flexcan_stby_gpio, 1);
	} else {
		/*
		 * avoid to disable CAN xcvr if any of the CAN interfaces
		 * are down. XCRV will be disabled only if both CAN2
		 * interfaces are DOWN.
		*/
		gpio_set_value_cansleep(flexcan_en_gpio, 0);
		gpio_set_value_cansleep(flexcan_stby_gpio, 0);
	}
}

static void imx6q_flexcan0_switch_auto(int enable)
{
	flexcan0_en = enable;
	mx6q_flexcan_switch();
}

static void imx6q_flexcan1_switch_auto(int enable)
{
	flexcan1_en = enable;
	mx6q_flexcan_switch();
}

static int __init imx6q_flexcan_fixup_auto(void)
{
	struct device_node *np;

	np = of_find_node_by_path("/soc/aips-bus@02000000/can@02090000");
	if (!np)
		return -ENODEV;

	flexcan_en_gpio = of_get_named_gpio(np, "trx-en-gpio", 0);
	flexcan_stby_gpio = of_get_named_gpio(np, "trx-stby-gpio", 0);
	if (gpio_is_valid(flexcan_en_gpio) && gpio_is_valid(flexcan_stby_gpio) &&
		!gpio_request_one(flexcan_en_gpio, GPIOF_DIR_OUT, "flexcan-trx-en") &&
		!gpio_request_one(flexcan_stby_gpio, GPIOF_DIR_OUT, "flexcan-trx-stby")) {
		/* flexcan 0 & 1 are using the same GPIOs for transceiver */
		flexcan_pdata[0].transceiver_switch = imx6q_flexcan0_switch_auto;
		flexcan_pdata[1].transceiver_switch = imx6q_flexcan1_switch_auto;
	}

	return 0;
}

/* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
static int ksz9021rn_phy_fixup(struct phy_device *phydev)
{
	if (IS_BUILTIN(CONFIG_PHYLIB)) {
		/* min rx data delay */
		phy_write(phydev, 0x0b, 0x8105);
		phy_write(phydev, 0x0c, 0x0000);

		/* max rx/tx clock delay, min rx/tx control delay */
		phy_write(phydev, 0x0b, 0x8104);
		phy_write(phydev, 0x0c, 0xf0f0);
		phy_write(phydev, 0x0b, 0x104);
	}

	return 0;
}

static void mmd_write_reg(struct phy_device *dev, int device, int reg, int val)
{
	phy_write(dev, 0x0d, device);
	phy_write(dev, 0x0e, reg);
	phy_write(dev, 0x0d, (1 << 14) | device);
	phy_write(dev, 0x0e, val);
}

static int ksz9031rn_phy_fixup(struct phy_device *dev)
{
	/*
	 * min rx data delay, max rx/tx clock delay,
	 * min rx/tx control delay
	 */
	mmd_write_reg(dev, 2, 4, 0);
	mmd_write_reg(dev, 2, 5, 0);
	mmd_write_reg(dev, 2, 8, 0x003ff);

	return 0;
}

static int ar8031_phy_fixup(struct phy_device *dev)
{
	u16 val;

	/* disable phy AR8031 SmartEEE function. */
	phy_write(dev, 0xd, 0x3);
	phy_write(dev, 0xe, 0x805d);
	phy_write(dev, 0xd, 0x4003);
	val = phy_read(dev, 0xe);
	val &= ~(0x1 << 8);
	phy_write(dev, 0xe, val);

	/* To enable AR8031 output a 125MHz clk from CLK_25M */
	phy_write(dev, 0xd, 0x7);
	phy_write(dev, 0xe, 0x8016);
	phy_write(dev, 0xd, 0x4007);

	val = phy_read(dev, 0xe);
	val &= 0xffe3;
	val |= 0x18;
	phy_write(dev, 0xe, val);

	/* introduce tx clock delay */
	phy_write(dev, 0x1d, 0x5);
	val = phy_read(dev, 0x1e);
	val |= 0x0100;
	phy_write(dev, 0x1e, val);

	return 0;
}

#define PHY_ID_AR8031	0x004dd074

static void __init imx6q_enet_phy_init(void)
{
	if (IS_BUILTIN(CONFIG_PHYLIB)) {
		phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
				ksz9021rn_phy_fixup);
		phy_register_fixup_for_uid(PHY_ID_KSZ9031, MICREL_PHY_ID_MASK,
				ksz9031rn_phy_fixup);
		phy_register_fixup_for_uid(PHY_ID_AR8031, 0xffffffff,
				ar8031_phy_fixup);
	}
}

static void __init imx6q_1588_init(void)
{
	struct regmap *gpr;

	gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
	if (!IS_ERR(gpr))
		regmap_update_bits(gpr, IOMUXC_GPR1,
				IMX6Q_GPR1_ENET_CLK_SEL_MASK,
				IMX6Q_GPR1_ENET_CLK_SEL_ANATOP);
	else
		pr_err("failed to find fsl,imx6q-iomux-gpr regmap\n");

}

static void __init imx6q_csi_mux_init(void)
{
	/*
	 * MX6Q SabreSD board:
	 * IPU1 CSI0 connects to parallel interface.
	 * Set GPR1 bit 19 to 0x1.
	 *
	 * MX6DL SabreSD board:
	 * IPU1 CSI0 connects to parallel interface.
	 * Set GPR13 bit 0-2 to 0x4.
	 * IPU1 CSI1 connects to MIPI CSI2 virtual channel 1.
	 * Set GPR13 bit 3-5 to 0x1.
	 */
	struct regmap *gpr;

	gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
	if (!IS_ERR(gpr)) {
		if (of_machine_is_compatible("fsl,imx6q-sabresd") ||
			of_machine_is_compatible("fsl,imx6q-sabreauto"))
			regmap_update_bits(gpr, IOMUXC_GPR1, 1 << 19, 1 << 19);
		else if (of_machine_is_compatible("fsl,imx6dl-sabresd") ||
			 of_machine_is_compatible("fsl,imx6dl-sabreauto"))
			regmap_update_bits(gpr, IOMUXC_GPR13, 0x3F, 0x0C);
	} else {
		pr_err("%s(): failed to find fsl,imx6q-iomux-gpr regmap\n",
		       __func__);
	}
}

#define OCOTP_MACn(n)	(0x00000620 + (n) * 0x10)
void __init imx6_enet_mac_init(const char *compatible)
{
	struct device_node *ocotp_np, *enet_np, *from = NULL;
	void __iomem *base;
	struct property *newmac;
	u32 macaddr_low;
	u32 macaddr_high = 0;
	u32 macaddr1_high = 0;
	u8 *macaddr;
	int i;

	for (i = 0; i < 2; i++) {
		enet_np = of_find_compatible_node(from, NULL, compatible);
		if (!enet_np)
			return;

		from = enet_np;

		if (of_get_mac_address(enet_np))
			goto put_enet_node;

		ocotp_np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-ocotp");
		if (!ocotp_np) {
			pr_warn("failed to find ocotp node\n");
			goto put_enet_node;
		}

		base = of_iomap(ocotp_np, 0);
		if (!base) {
			pr_warn("failed to map ocotp\n");
			goto put_ocotp_node;
		}

		macaddr_low = readl_relaxed(base + OCOTP_MACn(1));
		if (i)
			macaddr1_high = readl_relaxed(base + OCOTP_MACn(2));
		else
			macaddr_high = readl_relaxed(base + OCOTP_MACn(0));

		newmac = kzalloc(sizeof(*newmac) + 6, GFP_KERNEL);
		if (!newmac)
			goto put_ocotp_node;

		newmac->value = newmac + 1;
		newmac->length = 6;
		newmac->name = kstrdup("local-mac-address", GFP_KERNEL);
		if (!newmac->name) {
			kfree(newmac);
			goto put_ocotp_node;
		}

		macaddr = newmac->value;
		if (i) {
			macaddr[5] = (macaddr_low >> 16) & 0xff;
			macaddr[4] = (macaddr_low >> 24) & 0xff;
			macaddr[3] = macaddr1_high & 0xff;
			macaddr[2] = (macaddr1_high >> 8) & 0xff;
			macaddr[1] = (macaddr1_high >> 16) & 0xff;
			macaddr[0] = (macaddr1_high >> 24) & 0xff;
		} else {
			macaddr[5] = macaddr_high & 0xff;
			macaddr[4] = (macaddr_high >> 8) & 0xff;
			macaddr[3] = (macaddr_high >> 16) & 0xff;
			macaddr[2] = (macaddr_high >> 24) & 0xff;
			macaddr[1] = macaddr_low & 0xff;
			macaddr[0] = (macaddr_low >> 8) & 0xff;
		}

		of_update_property(enet_np, newmac);

put_ocotp_node:
	of_node_put(ocotp_np);
put_enet_node:
	of_node_put(enet_np);
	}
}

static inline void imx6q_enet_init(void)
{
	imx6_enet_mac_init("fsl,imx6q-fec");
	imx6q_enet_phy_init();
	imx6q_1588_init();
}

/* Add auxdata to pass platform data */
static const struct of_dev_auxdata imx6q_auxdata_lookup[] __initconst = {
	OF_DEV_AUXDATA("fsl,imx6q-flexcan", 0x02090000, NULL, &flexcan_pdata[0]),
	OF_DEV_AUXDATA("fsl,imx6q-flexcan", 0x02094000, NULL, &flexcan_pdata[1]),
	{ /* sentinel */ }
};

static void __init imx6q_init_machine(void)
{
	struct device *parent;

	mxc_arch_reset_init_dt();
	parent = imx_soc_device_init();
	if (parent == NULL)
		pr_warn("failed to initialize soc device\n");

	of_platform_populate(NULL, of_default_bus_match_table,
					imx6q_auxdata_lookup, parent);

	imx6q_enet_init();
	imx_anatop_init();
	imx6_pm_init();
	imx6q_csi_mux_init();
}

#define OCOTP_CFG3			0x440
#define OCOTP_CFG3_SPEED_SHIFT		16
#define OCOTP_CFG3_SPEED_1P2GHZ		0x3
#define OCOTP_CFG3_SPEED_1GHZ		0x2
#define OCOTP_CFG3_SPEED_850MHZ		0x1
#define OCOTP_CFG3_SPEED_800MHZ		0x0

static void __init imx6q_opp_check_speed_grading(struct device *cpu_dev)
{
	struct device_node *np;
	void __iomem *base;
	u32 val;

	np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-ocotp");
	if (!np) {
		pr_warn("failed to find ocotp node\n");
		return;
	}

	base = of_iomap(np, 0);
	if (!base) {
		pr_warn("failed to map ocotp\n");
		goto put_node;
	}

	/*
	 * SPEED_GRADING[1:0] defines the max speed of ARM:
	 * 2b'11: 1200000000Hz; -- i.MX6Q only.
	 * 2b'10: 1000000000Hz;
	 * 2b'01: 850000000Hz; -- i.MX6Q Only, exclusive with 1GHz.
	 * 2b'00: 800000000Hz;
	 * We need to set the max speed of ARM according to fuse map.
	 */
	val = readl_relaxed(base + OCOTP_CFG3);
	val >>= OCOTP_CFG3_SPEED_SHIFT;
	if (cpu_is_imx6q()) {
		if ((val & 0x3) < OCOTP_CFG3_SPEED_1P2GHZ)
			if (opp_disable(cpu_dev, 1200000000))
				pr_warn("failed to disable 1.2 GHz OPP\n");
	}
	if ((val & 0x3) < OCOTP_CFG3_SPEED_1GHZ)
		if (opp_disable(cpu_dev, 996000000))
			pr_warn("failed to disable 1 GHz OPP\n");
	if (cpu_is_imx6q()) {
		if ((val & 0x3) < OCOTP_CFG3_SPEED_850MHZ ||
			(val & 0x3) == OCOTP_CFG3_SPEED_1GHZ)
			if (opp_disable(cpu_dev, 852000000))
				pr_warn("failed to disable 850 MHz OPP\n");
	}

put_node:
	of_node_put(np);
}

static void __init imx6q_opp_init(struct device *cpu_dev)
{
	struct device_node *np;

	np = of_find_node_by_path("/cpus/cpu@0");
	if (!np) {
		pr_warn("failed to find cpu0 node\n");
		return;
	}

	cpu_dev->of_node = np;
	if (of_init_opp_table(cpu_dev)) {
		pr_warn("failed to init OPP table\n");
		goto put_node;
	}

	imx6q_opp_check_speed_grading(cpu_dev);

put_node:
	of_node_put(np);
}

#define ESAI_AUDIO_MCLK 24576000

static void __init imx6q_audio_lvds2_init(void)
{
	struct clk *pll4_sel, *lvds2_in, *pll4_audio_div, *esai;

	pll4_audio_div = clk_get_sys(NULL, "pll4_audio_div");
	pll4_sel = clk_get_sys(NULL, "pll4_sel");
	lvds2_in = clk_get_sys(NULL, "lvds2_in");
	esai = clk_get_sys(NULL, "esai");
	if (IS_ERR(pll4_audio_div) || IS_ERR(pll4_sel) ||
	    IS_ERR(lvds2_in) || IS_ERR(esai))
		return;

	if (clk_get_rate(lvds2_in) != ESAI_AUDIO_MCLK)
		return;

	clk_set_parent(pll4_sel, lvds2_in);
	clk_set_rate(pll4_audio_div, 786432000);
	clk_set_rate(esai, ESAI_AUDIO_MCLK);
}

static struct platform_device imx6q_cpufreq_pdev = {
	.name = "imx6-cpufreq",
};

static void __init imx6q_init_late(void)
{
	struct regmap *gpr;

	/*
	 * Need to force IOMUXC irq pending to meet CCM low power mode
	 * restriction, this is recommended by hardware team.
	 */
	gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
	if (!IS_ERR(gpr))
		regmap_update_bits(gpr, IOMUXC_GPR1,
			IMX6Q_GPR1_GINT_MASK,
			IMX6Q_GPR1_GINT_ASSERT);

	/*
	 * WAIT mode is broken on TO 1.0 and 1.1, so there is no point
	 * to run cpuidle on them.
	 */
	if ((cpu_is_imx6q() && imx_get_soc_revision() > IMX_CHIP_REVISION_1_1)
		|| (cpu_is_imx6dl() && imx_get_soc_revision() >
		IMX_CHIP_REVISION_1_0))
		imx6q_cpuidle_init();

	if (IS_ENABLED(CONFIG_ARM_IMX6_CPUFREQ)) {
		imx6q_opp_init(&imx6q_cpufreq_pdev.dev);
		platform_device_register(&imx6q_cpufreq_pdev);
	}

	if (of_machine_is_compatible("fsl,imx6q-sabreauto")
		|| of_machine_is_compatible("fsl,imx6dl-sabreauto")) {
		imx6q_flexcan_fixup_auto();
		imx6q_audio_lvds2_init();
	}
}

static void __init imx6q_map_io(void)
{
	debug_ll_io_init();
	imx_scu_map_io();
	imx6_pm_map_io();
}

static void __init imx6q_init_irq(void)
{
	imx_init_revision_from_anatop();
	imx_init_l2cache();
	imx_src_init();
	imx_gpc_init();
	irqchip_init();
}

static void __init imx6q_timer_init(void)
{
	of_clk_init(NULL);
	clocksource_of_init();
	imx_print_silicon_rev(cpu_is_imx6dl() ? "i.MX6DL" : "i.MX6Q",
			      imx_get_soc_revision());
}

static const char *imx6q_dt_compat[] __initdata = {
	"fsl,imx6dl",
	"fsl,imx6q",
	NULL,
};

DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad/DualLite (Device Tree)")
	/*
	 * i.MX6Q/DL maps system memory at 0x10000000 (offset 256MiB), and
	 * GPU has a limit on physical address that it accesses, which must
	 * be below 2GiB.
	 */
	.dma_zone_size	= (SZ_2G - SZ_256M),
	.smp		= smp_ops(imx_smp_ops),
	.map_io		= imx6q_map_io,
	.init_irq	= imx6q_init_irq,
	.init_time	= imx6q_timer_init,
	.init_machine	= imx6q_init_machine,
	.init_late      = imx6q_init_late,
	.dt_compat	= imx6q_dt_compat,
	.restart	= mxc_restart,
MACHINE_END