/*
 * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

#include <common.h>
#include <dm.h>
#include <misc.h>
#include <spl.h>
#include <syscon.h>
#include <usb.h>
#include <dm/pinctrl.h>
#include <dm/uclass-internal.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <asm/setup.h>
#include <asm/arch/clock.h>
#include <asm/arch/cru_rk3399.h>
#include <asm/arch/hardware.h>
#include <asm/arch/grf_rk3399.h>
#include <asm/arch/periph.h>
#include <power/regulator.h>
#include <u-boot/sha256.h>

DECLARE_GLOBAL_DATA_PTR;

int board_init(void)
{
	int ret;

	/*
	 * We need to call into regulators_enable_boot_on() again, as the call
	 * during SPL may have not included all regulators.
	 */
	ret = regulators_enable_boot_on(false);
	if (ret)
		debug("%s: Cannot enable boot on regulator\n", __func__);

	return 0;
}

static void rk3399_force_power_on_reset(void)
{
	ofnode node;
	struct gpio_desc sysreset_gpio;

	debug("%s: trying to force a power-on reset\n", __func__);

	node = ofnode_path("/config");
	if (!ofnode_valid(node)) {
		debug("%s: no /config node?\n", __func__);
		return;
	}

	if (gpio_request_by_name_nodev(node, "sysreset-gpio", 0,
				       &sysreset_gpio, GPIOD_IS_OUT)) {
		debug("%s: could not find a /config/sysreset-gpio\n", __func__);
		return;
	}

	dm_gpio_set_value(&sysreset_gpio, 1);
}

void spl_board_init(void)
{
	int  ret;
	struct rk3399_cru *cru = rockchip_get_cru();

	/*
	 * The RK3399 resets only 'almost all logic' (see also in the TRM
	 * "3.9.4 Global software reset"), when issuing a software reset.
	 * This may cause issues during boot-up for some configurations of
	 * the application software stack.
	 *
	 * To work around this, we test whether the last reset reason was
	 * a power-on reset and (if not) issue an overtemp-reset to reset
	 * the entire module.
	 *
	 * While this was previously fixed by modifying the various places
	 * that could generate a software reset (e.g. U-Boot's sysreset
	 * driver, the ATF or Linux), we now have it here to ensure that
	 * we no longer have to track this through the various components.
	 */
	if (cru->glb_rst_st != 0)
		rk3399_force_power_on_reset();

	/*
	 * Turning the eMMC and SPI back on (if disabled via the Qseven
	 * BIOS_ENABLE) signal is done through a always-on regulator).
	 */
	ret = regulators_enable_boot_on(false);
	if (ret)
		debug("%s: Cannot enable boot on regulator\n", __func__);

	preloader_console_init();
}

static void setup_macaddr(void)
{
#if CONFIG_IS_ENABLED(CMD_NET)
	int ret;
	const char *cpuid = env_get("cpuid#");
	u8 hash[SHA256_SUM_LEN];
	int size = sizeof(hash);
	u8 mac_addr[6];

	/* Only generate a MAC address, if none is set in the environment */
	if (env_get("ethaddr"))
		return;

	if (!cpuid) {
		debug("%s: could not retrieve 'cpuid#'\n", __func__);
		return;
	}

	ret = hash_block("sha256", (void *)cpuid, strlen(cpuid), hash, &size);
	if (ret) {
		debug("%s: failed to calculate SHA256\n", __func__);
		return;
	}

	/* Copy 6 bytes of the hash to base the MAC address on */
	memcpy(mac_addr, hash, 6);

	/* Make this a valid MAC address and set it */
	mac_addr[0] &= 0xfe;  /* clear multicast bit */
	mac_addr[0] |= 0x02;  /* set local assignment bit (IEEE802) */
	eth_env_set_enetaddr("ethaddr", mac_addr);
#endif
}

static void setup_serial(void)
{
#if CONFIG_IS_ENABLED(ROCKCHIP_EFUSE)
	const u32 cpuid_offset = 0x7;
	const u32 cpuid_length = 0x10;

	struct udevice *dev;
	int ret, i;
	u8 cpuid[cpuid_length];
	u8 low[cpuid_length/2], high[cpuid_length/2];
	char cpuid_str[cpuid_length * 2 + 1];
	u64 serialno;
	char serialno_str[17];

	/* retrieve the device */
	ret = uclass_get_device_by_driver(UCLASS_MISC,
					  DM_GET_DRIVER(rockchip_efuse), &dev);
	if (ret) {
		debug("%s: could not find efuse device\n", __func__);
		return;
	}

	/* read the cpu_id range from the efuses */
	ret = misc_read(dev, cpuid_offset, &cpuid, sizeof(cpuid));
	if (ret) {
		debug("%s: reading cpuid from the efuses failed\n",
		      __func__);
		return;
	}

	memset(cpuid_str, 0, sizeof(cpuid_str));
	for (i = 0; i < 16; i++)
		sprintf(&cpuid_str[i * 2], "%02x", cpuid[i]);

	debug("cpuid: %s\n", cpuid_str);

	/*
	 * Mix the cpuid bytes using the same rules as in
	 *   ${linux}/drivers/soc/rockchip/rockchip-cpuinfo.c
	 */
	for (i = 0; i < 8; i++) {
		low[i] = cpuid[1 + (i << 1)];
		high[i] = cpuid[i << 1];
	}

	serialno = crc32_no_comp(0, low, 8);
	serialno |= (u64)crc32_no_comp(serialno, high, 8) << 32;
	snprintf(serialno_str, sizeof(serialno_str), "%016llx", serialno);

	env_set("cpuid#", cpuid_str);
	env_set("serial#", serialno_str);
#endif
}

static void setup_iodomain(void)
{
	const u32 GRF_IO_VSEL_GPIO4CD_SHIFT = 3;
	struct rk3399_grf_regs *grf =
	    syscon_get_first_range(ROCKCHIP_SYSCON_GRF);

	/*
	 * Set bit 3 in GRF_IO_VSEL so PCIE_RST# works (pin GPIO4_C6).
	 * Linux assumes that PCIE_RST# works out of the box as it probes
	 * PCIe before loading the iodomain driver.
	 */
	rk_setreg(&grf->io_vsel, 1 << GRF_IO_VSEL_GPIO4CD_SHIFT);
}

int misc_init_r(void)
{
	setup_serial();
	setup_macaddr();
	setup_iodomain();

	return 0;
}

#ifdef CONFIG_SERIAL_TAG
void get_board_serial(struct tag_serialnr *serialnr)
{
	char *serial_string;
	u64 serial = 0;

	serial_string = env_get("serial#");

	if (serial_string)
		serial = simple_strtoull(serial_string, NULL, 16);

	serialnr->high = (u32)(serial >> 32);
	serialnr->low = (u32)(serial & 0xffffffff);
}
#endif

/**
 * Switch power at an external regulator (for our root hub).
 *
 * @param ctrl pointer to the xHCI controller
 * @param port port number as in the control message (one-based)
 * @param enable boolean indicating whether to enable or disable power
 * @return returns 0 on success, an error-code on failure
 */
static int board_usb_port_power_set(struct udevice *dev, int port,
				    bool enable)
{
#if CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DM_REGULATOR)
	/* We start counting ports at 0, while USB counts from 1. */
	int index = port - 1;
	const char *regname = NULL;
	struct udevice *regulator;
	const char *prop = "tsd,usb-port-power";
	int ret;

	debug("%s: ctrl '%s' port %d enable %s\n", __func__,
	      dev_read_name(dev), port, enable ? "true" : "false");

	ret = dev_read_string_index(dev, prop, index, &regname);
	if (ret < 0) {
		debug("%s: ctrl '%s' port %d: no entry in '%s'\n",
		      __func__, dev_read_name(dev), port, prop);
		return ret;
	}

	ret = regulator_get_by_platname(regname, &regulator);
	if (ret) {
		debug("%s: ctrl '%s' port %d: could not get regulator '%s'\n",
		      __func__, dev_read_name(dev), port, regname);
		return ret;
	}

	regulator_set_enable(regulator, enable);
	return 0;
#else
	return -ENOTSUPP;
#endif
}

void usb_hub_reset_devices(struct usb_hub_device *hub, int port)
{
	struct udevice *dev = hub->pusb_dev->dev;
	struct udevice *ctrl;

	/* We are only interested in our root-hubs */
	if (usb_hub_is_root_hub(dev) == false)
		return;

	ctrl = usb_get_bus(dev);
	if (!ctrl) {
		debug("%s: could not retrieve ctrl for hub\n", __func__);
		return;
	}

	/*
	 * To work around an incompatibility between the single-threaded
	 * USB stack in U-Boot and (a strange low-power mode of) the USB
	 * hub we have on-module, we need to delay powering on the hub
	 * until the first time the port is probed.
	 */
	board_usb_port_power_set(ctrl, port, true);
}