rk3399_gpio.c

/*
 * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */
#include <assert.h>
#include <debug.h>
#include <delay_timer.h>
#include <errno.h>
#include <gpio.h>
#include <mmio.h>
#include <platform.h>
#include <platform_def.h>
#include <plat_private.h>
#include <soc.h>

uint32_t gpio_port[] = {
	GPIO0_BASE,
	GPIO1_BASE,
	GPIO2_BASE,
	GPIO3_BASE,
	GPIO4_BASE,
};

#define SWPORTA_DR	0x00
#define SWPORTA_DDR	0x04
#define EXT_PORTA	0x50

#define PMU_GPIO_PORT0	0
#define PMU_GPIO_PORT1	1
#define GPIO_PORT2	2
#define GPIO_PORT3	3
#define GPIO_PORT4	4

#define PMU_GRF_GPIO0A_P	0x40
#define GRF_GPIO2A_P		0xe040
#define GPIO_P_MASK		0x03

#define GET_GPIO_PORT(pin)	(pin / 32)
#define GET_GPIO_NUM(pin)	(pin % 32)
#define GET_GPIO_BANK(pin)	((pin % 32) / 8)
#define GET_GPIO_ID(pin)	((pin % 32) % 8)

/* returns old clock state, enables clock, in order to do GPIO access */
static int gpio_get_clock(uint32_t gpio_number)
{
	uint32_t port = GET_GPIO_PORT(gpio_number);
	uint32_t clock_state = 0;

	assert(port < 5);

	switch (port) {
	case PMU_GPIO_PORT0:
		clock_state = (mmio_read_32(PMUCRU_BASE +
					    CRU_PMU_CLKGATE_CON(1)) >>
					    PCLK_GPIO0_GATE_SHIFT) & 0x01;
		mmio_write_32(PMUCRU_BASE + CRU_PMU_CLKGATE_CON(1),
			      BITS_WITH_WMASK(0, CLK_GATE_MASK,
					      PCLK_GPIO0_GATE_SHIFT));
		break;
	case PMU_GPIO_PORT1:
		clock_state = (mmio_read_32(PMUCRU_BASE +
					    CRU_PMU_CLKGATE_CON(1)) >>
					    PCLK_GPIO1_GATE_SHIFT) & 0x01;
		mmio_write_32(PMUCRU_BASE + CRU_PMU_CLKGATE_CON(1),
			      BITS_WITH_WMASK(0, CLK_GATE_MASK,
					      PCLK_GPIO1_GATE_SHIFT));
		break;
	case GPIO_PORT2:
		clock_state = (mmio_read_32(CRU_BASE +
					    CRU_CLKGATE_CON(31)) >>
					    PCLK_GPIO2_GATE_SHIFT) & 0x01;
		mmio_write_32(CRU_BASE + CRU_CLKGATE_CON(31),
			      BITS_WITH_WMASK(0, CLK_GATE_MASK,
					      PCLK_GPIO2_GATE_SHIFT));
		break;
	case GPIO_PORT3:
		clock_state = (mmio_read_32(CRU_BASE +
					    CRU_CLKGATE_CON(31)) >>
					    PCLK_GPIO3_GATE_SHIFT) & 0x01;
		mmio_write_32(CRU_BASE + CRU_CLKGATE_CON(31),
			      BITS_WITH_WMASK(0, CLK_GATE_MASK,
					      PCLK_GPIO3_GATE_SHIFT));
		break;
	case GPIO_PORT4:
		clock_state = (mmio_read_32(CRU_BASE +
					    CRU_CLKGATE_CON(31)) >>
					    PCLK_GPIO4_GATE_SHIFT) & 0x01;
		mmio_write_32(CRU_BASE + CRU_CLKGATE_CON(31),
			      BITS_WITH_WMASK(0, CLK_GATE_MASK,
					      PCLK_GPIO4_GATE_SHIFT));
		break;
	default:
		break;
	}

	return clock_state;
}

/* restores old state of gpio clock */
void gpio_put_clock(uint32_t gpio_number, uint32_t clock_state)
{
	uint32_t port = GET_GPIO_PORT(gpio_number);

	switch (port) {
	case PMU_GPIO_PORT0:
		mmio_write_32(PMUCRU_BASE + CRU_PMU_CLKGATE_CON(1),
			      BITS_WITH_WMASK(clock_state, CLK_GATE_MASK,
					      PCLK_GPIO0_GATE_SHIFT));
		break;
	case PMU_GPIO_PORT1:
		mmio_write_32(PMUCRU_BASE + CRU_PMU_CLKGATE_CON(1),
			      BITS_WITH_WMASK(clock_state, CLK_GATE_MASK,
					      PCLK_GPIO1_GATE_SHIFT));
		break;
	case GPIO_PORT2:
		mmio_write_32(CRU_BASE + CRU_CLKGATE_CON(31),
			      BITS_WITH_WMASK(clock_state, CLK_GATE_MASK,
					      PCLK_GPIO2_GATE_SHIFT));
		break;
	case GPIO_PORT3:
		mmio_write_32(CRU_BASE + CRU_CLKGATE_CON(31),
			      BITS_WITH_WMASK(clock_state, CLK_GATE_MASK,
					      PCLK_GPIO3_GATE_SHIFT));

		break;
	case GPIO_PORT4:
		mmio_write_32(CRU_BASE + CRU_CLKGATE_CON(31),
			      BITS_WITH_WMASK(clock_state, CLK_GATE_MASK,
					      PCLK_GPIO4_GATE_SHIFT));
		break;
	default:
		break;
	}
}

static int get_pull(int gpio)
{
	uint32_t port = GET_GPIO_PORT(gpio);
	uint32_t bank = GET_GPIO_BANK(gpio);
	uint32_t id = GET_GPIO_ID(gpio);
	uint32_t val, clock_state;

	assert((port < 5) && (bank < 4));

	clock_state = gpio_get_clock(gpio);

	if (port == PMU_GPIO_PORT0 || port == PMU_GPIO_PORT1) {
		val = mmio_read_32(PMUGRF_BASE + PMU_GRF_GPIO0A_P +
				   port * 16 + bank * 4);
		val = (val >> (id * 2)) & GPIO_P_MASK;
	} else {
		val = mmio_read_32(GRF_BASE + GRF_GPIO2A_P +
				   (port - 2) * 16 + bank * 4);
		val = (val >> (id * 2)) & GPIO_P_MASK;
	}
	gpio_put_clock(gpio, clock_state);

	/*
	 * in gpio0a, gpio0b, gpio2c, gpio2d,
	 * 00: Z
	 * 01: pull down
	 * 10: Z
	 * 11: pull up
	 * different with other gpio, so need to correct it
	 */
	if (((port == 0) && (bank < 2)) || ((port == 2) && (bank > 1))) {
		if (val == 3)
			val = GPIO_PULL_UP;
		else if (val == 1)
			val = GPIO_PULL_DOWN;
		else
			val = 0;
	}

	return val;
}

static void set_pull(int gpio, int pull)
{
	uint32_t port = GET_GPIO_PORT(gpio);
	uint32_t bank = GET_GPIO_BANK(gpio);
	uint32_t id = GET_GPIO_ID(gpio);
	uint32_t clock_state;

	assert((port < 5) && (bank < 4));

	clock_state = gpio_get_clock(gpio);

	/*
	 * in gpio0a, gpio0b, gpio2c, gpio2d,
	 * 00: Z
	 * 01: pull down
	 * 10: Z
	 * 11: pull up
	 * different with other gpio, so need to correct it
	 */
	if (((port == 0) && (bank < 2)) || ((port == 2) && (bank > 1))) {
		if (pull == GPIO_PULL_UP)
			pull = 3;
		else if (pull == GPIO_PULL_DOWN)
			pull = 1;
		else
			pull = 0;
	}

	if (port == PMU_GPIO_PORT0 || port == PMU_GPIO_PORT1) {
		mmio_write_32(PMUGRF_BASE + PMU_GRF_GPIO0A_P +
			      port * 16 + bank * 4,
			      BITS_WITH_WMASK(pull, GPIO_P_MASK, id * 2));
	} else {
		mmio_write_32(GRF_BASE + GRF_GPIO2A_P +
			      (port - 2) * 16 + bank * 4,
			      BITS_WITH_WMASK(pull, GPIO_P_MASK, id * 2));
	}
	gpio_put_clock(gpio, clock_state);
}

static void set_direction(int gpio, int direction)
{
	uint32_t port = GET_GPIO_PORT(gpio);
	uint32_t num = GET_GPIO_NUM(gpio);
	uint32_t clock_state;

	assert((port < 5) && (num < 32));

	clock_state = gpio_get_clock(gpio);

	/*
	 * in gpio.h
	 * #define GPIO_DIR_OUT	0
	 * #define GPIO_DIR_IN	1
	 * but rk3399 gpio direction 1: output, 0: input
	 * so need to revert direction value
	 */
	mmio_setbits_32(gpio_port[port] + SWPORTA_DDR, !direction << num);
	gpio_put_clock(gpio, clock_state);
}

static int get_direction(int gpio)
{
	uint32_t port = GET_GPIO_PORT(gpio);
	uint32_t num = GET_GPIO_NUM(gpio);
	int direction, clock_state;

	assert((port < 5) && (num < 32));

	clock_state = gpio_get_clock(gpio);

	/*
	 * in gpio.h
	 * #define GPIO_DIR_OUT	0
	 * #define GPIO_DIR_IN	1
	 * but rk3399 gpio direction 1: output, 0: input
	 * so need to revert direction value
	 */
	direction = !((mmio_read_32(gpio_port[port] +
				    SWPORTA_DDR) >> num) & 0x1);
	gpio_put_clock(gpio, clock_state);

	return direction;
}

static int get_value(int gpio)
{
	uint32_t port = GET_GPIO_PORT(gpio);
	uint32_t num = GET_GPIO_NUM(gpio);
	int value, clock_state;

	assert((port < 5) && (num < 32));

	clock_state = gpio_get_clock(gpio);
	value = (mmio_read_32(gpio_port[port] + EXT_PORTA) >> num) & 0x1;
	gpio_put_clock(gpio, clock_state);

	return value;
}

static void set_value(int gpio, int value)
{
	uint32_t port = GET_GPIO_PORT(gpio);
	uint32_t num = GET_GPIO_NUM(gpio);
	uint32_t clock_state;

	assert((port < 5) && (num < 32));

	clock_state = gpio_get_clock(gpio);
	mmio_clrsetbits_32(gpio_port[port] + SWPORTA_DR, 1 << num,
							 !!value << num);
	gpio_put_clock(gpio, clock_state);
}

const gpio_ops_t rk3399_gpio_ops = {
	.get_direction = get_direction,
	.set_direction = set_direction,
	.get_value = get_value,
	.set_value = set_value,
	.set_pull = set_pull,
	.get_pull = get_pull,
};

void plat_rockchip_gpio_init(void)
{
	gpio_init(&rk3399_gpio_ops);
}