sunxi_common.c

/*
 * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <errno.h>

#include <platform_def.h>

#include <arch_helpers.h>
#include <common/debug.h>
#include <lib/mmio.h>
#include <lib/xlat_tables/xlat_tables_v2.h>
#include <plat/common/platform.h>

#include <sunxi_def.h>
#include <sunxi_mmap.h>
#include <sunxi_private.h>

static const mmap_region_t sunxi_mmap[PLATFORM_MMAP_REGIONS + 1] = {
	MAP_REGION_FLAT(SUNXI_SRAM_BASE, SUNXI_SRAM_SIZE,
			MT_RW_DATA | MT_SECURE),
	MAP_REGION_FLAT(SUNXI_SCP_BASE, SUNXI_SCP_SIZE,
			MT_DEVICE | MT_RW | MT_SECURE | MT_EXECUTE_NEVER),
	MAP_REGION_FLAT(SUNXI_DEV_BASE, SUNXI_DEV_SIZE,
			MT_DEVICE | MT_RW | MT_SECURE | MT_EXECUTE_NEVER),
	MAP_REGION(SUNXI_DRAM_BASE, SUNXI_DRAM_VIRT_BASE, SUNXI_DRAM_SEC_SIZE,
		   MT_RW_DATA | MT_SECURE),
	MAP_REGION(PRELOADED_BL33_BASE,
		   SUNXI_DRAM_VIRT_BASE + SUNXI_DRAM_SEC_SIZE,
		   SUNXI_DRAM_MAP_SIZE,
		   MT_RO_DATA | MT_NS),
	{},
};

unsigned int plat_get_syscnt_freq2(void)
{
	return SUNXI_OSC24M_CLK_IN_HZ;
}

void sunxi_configure_mmu_el3(int flags)
{
	mmap_add_region(BL_CODE_BASE, BL_CODE_BASE,
			BL_CODE_END - BL_CODE_BASE,
			MT_CODE | MT_SECURE);
	mmap_add_region(BL_RO_DATA_BASE, BL_RO_DATA_BASE,
			BL_RO_DATA_END - BL_RO_DATA_BASE,
			MT_RO_DATA | MT_SECURE);
	mmap_add_region(BL_COHERENT_RAM_BASE, BL_COHERENT_RAM_BASE,
			BL_COHERENT_RAM_END - BL_COHERENT_RAM_BASE,
			MT_DEVICE | MT_RW | MT_SECURE | MT_EXECUTE_NEVER);

	mmap_add(sunxi_mmap);
	init_xlat_tables();

	enable_mmu_el3(0);
}

#define SRAM_VER_REG (SUNXI_SYSCON_BASE + 0x24)
uint16_t sunxi_read_soc_id(void)
{
	uint32_t reg = mmio_read_32(SRAM_VER_REG);

	/* Set bit 15 to prepare for the SOCID read. */
	mmio_write_32(SRAM_VER_REG, reg | BIT(15));

	reg = mmio_read_32(SRAM_VER_REG);

	/* deactivate the SOCID access again */
	mmio_write_32(SRAM_VER_REG, reg & ~BIT(15));

	return reg >> 16;
}

/*
 * Configure a given pin to the GPIO-OUT function and sets its level.
 * The port is given as a capital letter, the pin is the number within
 * this port group.
 * So to set pin PC7 to high, use: sunxi_set_gpio_out('C', 7, true);
 */
void sunxi_set_gpio_out(char port, int pin, bool level_high)
{
	uintptr_t port_base;

	if (port < 'A' || port > 'L')
		return;
	if (port == 'L')
		port_base = SUNXI_R_PIO_BASE;
	else
		port_base = SUNXI_PIO_BASE + (port - 'A') * 0x24;

	/* Set the new level first before configuring the pin. */
	if (level_high)
		mmio_setbits_32(port_base + 0x10, BIT(pin));
	else
		mmio_clrbits_32(port_base + 0x10, BIT(pin));

	/* configure pin as GPIO out (4(3) bits per pin, 1: GPIO out */
	mmio_clrsetbits_32(port_base + (pin / 8) * 4,
			   0x7 << ((pin % 8) * 4),
			   0x1 << ((pin % 8) * 4));
}

int sunxi_init_platform_r_twi(uint16_t socid, bool use_rsb)
{
	uint32_t pin_func = 0x77;
	uint32_t device_bit;
	unsigned int reset_offset = 0xb0;

	switch (socid) {
	case SUNXI_SOC_H5:
		if (use_rsb)
			return -ENODEV;
		pin_func = 0x22;
		device_bit = BIT(6);
		break;
	case SUNXI_SOC_H6:
		if (use_rsb)
			return -ENODEV;
		pin_func = 0x33;
		device_bit = BIT(16);
		reset_offset = 0x19c;
		break;
	case SUNXI_SOC_A64:
		pin_func = use_rsb ? 0x22 : 0x33;
		device_bit = use_rsb ? BIT(3) : BIT(6);
		break;
	default:
		INFO("R_I2C/RSB on Allwinner 0x%x SoC not supported\n", socid);
		return -ENODEV;
	}

	/* un-gate R_PIO clock */
	if (socid != SUNXI_SOC_H6)
		mmio_setbits_32(SUNXI_R_PRCM_BASE + 0x28, BIT(0));

	/* switch pins PL0 and PL1 to the desired function */
	mmio_clrsetbits_32(SUNXI_R_PIO_BASE + 0x00, 0xffU, pin_func);

	/* level 2 drive strength */
	mmio_clrsetbits_32(SUNXI_R_PIO_BASE + 0x14, 0x0fU, 0xaU);

	/* set both pins to pull-up */
	mmio_clrsetbits_32(SUNXI_R_PIO_BASE + 0x1c, 0x0fU, 0x5U);

	/* un-gate clock */
	if (socid != SUNXI_SOC_H6)
		mmio_setbits_32(SUNXI_R_PRCM_BASE + 0x28, device_bit);
	else
		mmio_setbits_32(SUNXI_R_PRCM_BASE + 0x19c, device_bit | BIT(0));

	/* assert, then de-assert reset of I2C/RSB controller */
	mmio_clrbits_32(SUNXI_R_PRCM_BASE + reset_offset, device_bit);
	mmio_setbits_32(SUNXI_R_PRCM_BASE + reset_offset, device_bit);

	return 0;
}

/* This lock synchronises access to the arisc management processor. */
DEFINE_BAKERY_LOCK(arisc_lock);

/*
 * Tell the "arisc" SCP core (an OpenRISC core) to execute some code.
 * We don't have any service running there, so we place some OpenRISC code
 * in SRAM, put the address of that into the reset vector and release the
 * arisc reset line. The SCP will execute that code and pull the line up again.
 */
void sunxi_execute_arisc_code(uint32_t *code, size_t size, uint16_t param)
{
	uintptr_t arisc_reset_vec = SUNXI_SRAM_A2_BASE + 0x100;

	do {
		bakery_lock_get(&arisc_lock);
		/* Wait until the arisc is in reset state. */
		if (!(mmio_read_32(SUNXI_R_CPUCFG_BASE) & BIT(0)))
			break;

		bakery_lock_release(&arisc_lock);
	} while (1);

	/* Patch up the code to feed in an input parameter. */
	code[0] = (code[0] & ~0xffff) | param;
	clean_dcache_range((uintptr_t)code, size);

	/*
	 * The OpenRISC unconditional branch has opcode 0, the branch offset
	 * is in the lower 26 bits, containing the distance to the target,
	 * in instruction granularity (32 bits).
	 */
	mmio_write_32(arisc_reset_vec, ((uintptr_t)code - arisc_reset_vec) / 4);
	clean_dcache_range(arisc_reset_vec, 4);

	/* De-assert the arisc reset line to let it run. */
	mmio_setbits_32(SUNXI_R_CPUCFG_BASE, BIT(0));

	/*
	 * We release the lock here, although the arisc is still busy.
	 * But as long as it runs, the reset line is high, so other users
	 * won't leave the loop above.
	 * Once it has finished, the code is supposed to clear the reset line,
	 * to signal this to other users.
	 */
	bakery_lock_release(&arisc_lock);
}