xref: /src/sys/arch/arm/samsung/exynos_platform.c

/* $NetBSD: exynos_platform.c,v 1.8.2.4 2018/09/30 01:45:38 pgoyette Exp $ */

/*-
 * Copyright (c) 2017 Jared D. McNeill <jmcneill (at) invisible.ca>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "opt_arm_debug.h"
#include "opt_console.h"
#include "opt_exynos.h"
#include "opt_multiprocessor.h"
#include "opt_console.h"

#include "ukbd.h"

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: exynos_platform.c,v 1.8.2.4 2018/09/30 01:45:38 pgoyette Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/cpu.h>
#include <sys/device.h>
#include <sys/termios.h>

#include <dev/fdt/fdtvar.h>

#include <uvm/uvm_extern.h>

#include <machine/bootconfig.h>
#include <arm/cpufunc.h>

#include <arm/samsung/exynos_reg.h>
#include <arm/samsung/exynos_var.h>
#include <arm/samsung/mct_var.h>
#include <arm/samsung/sscom_reg.h>

#include <evbarm/exynos/platform.h>

#include <arm/fdt/arm_fdtvar.h>

void exynos_platform_early_putchar(char);

#define	EXYNOS5_SWRESET_REG	0x10040400

#define EXYNOS_IOPHYSTOVIRT(a) \
    ((vaddr_t)(((a) - EXYNOS_CORE_PBASE) + EXYNOS_CORE_VBASE))

#define	EXYNOS5800_PMU_BASE		0x10040000
#define	EXYNOS5800_PMU_SIZE		0x20000
#define	 EXYNOS5800_PMU_CORE_CONFIG(n)	(0x2000 + 0x80 * (n))
#define	 EXYNOS5800_PMU_CORE_STATUS(n)	(0x2004 + 0x80 * (n))
#define	 EXYNOS5800_PMU_CORE_POWER_EN	0x3
#define	EXYNOS5800_SYSRAM_BASE		0x0207301c
#define	EXYNOS5800_SYSRAM_SIZE		0x4

static void
exynos5800_mp_bootstrap(void)
{
#if defined(MULTIPROCESSOR)
	extern void cortex_mpstart(void);
	bus_space_tag_t bst = &armv7_generic_bs_tag;
	bus_space_handle_t pmu_bsh, sysram_bsh;
	uint32_t val, started = 0;
	int n;

	arm_cpu_max = 1 + __SHIFTOUT(armreg_l2ctrl_read(), L2CTRL_NUMCPU);

	bus_space_map(bst, EXYNOS5800_PMU_BASE, EXYNOS5800_PMU_SIZE, 0, &pmu_bsh);
	bus_space_map(bst, EXYNOS5800_SYSRAM_BASE, EXYNOS5800_SYSRAM_SIZE, 0, &sysram_bsh);

	bus_space_write_4(bst, sysram_bsh, 0, (uint32_t)cortex_mpstart);
	bus_space_barrier(bst, sysram_bsh, 0, 4, BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);

	for (n = 1; n < arm_cpu_max; n++) {
		bus_space_write_4(bst, pmu_bsh, EXYNOS5800_PMU_CORE_CONFIG(n),
		    EXYNOS5800_PMU_CORE_POWER_EN);
		for (u_int i = 0x01000000; i > 0; i--) {
			val = bus_space_read_4(bst, pmu_bsh, EXYNOS5800_PMU_CORE_STATUS(n));
			if ((val & EXYNOS5800_PMU_CORE_POWER_EN) == EXYNOS5800_PMU_CORE_POWER_EN) {
				started |= __BIT(n);
				break;
			}
		}
	}

	for (u_int i = 0x10000000; i > 0; i--) {
		arm_dmb();
		if (arm_cpu_hatched == started)
			break;
	}

	bus_space_unmap(bst, sysram_bsh, EXYNOS5800_SYSRAM_SIZE);
	bus_space_unmap(bst, pmu_bsh, EXYNOS5800_PMU_SIZE);
#endif
}

static struct of_compat_data mp_compat_data[] = {
	{ "samsung,exynos5800",		(uintptr_t)exynos5800_mp_bootstrap },
	{ NULL }
};

static void
exynos_platform_bootstrap(void)
{

	exynos_bootstrap();

	void (*mp_bootstrap)(void) = NULL;
	const struct of_compat_data *cd = of_search_compatible(OF_finddevice("/"), mp_compat_data);
	if (cd)
		mp_bootstrap = (void (*)(void))cd->data;

	if (mp_bootstrap)
		mp_bootstrap();
}

static void
exynos_platform_init_attach_args(struct fdt_attach_args *faa)
{
	extern struct bus_space armv7_generic_bs_tag;
	extern struct bus_space armv7_generic_a4x_bs_tag;
	extern struct arm32_bus_dma_tag arm_generic_dma_tag;

	faa->faa_bst = &armv7_generic_bs_tag;
	faa->faa_a4x_bst = &armv7_generic_a4x_bs_tag;
	faa->faa_dmat = &arm_generic_dma_tag;
}


void
exynos_platform_early_putchar(char c)
{
#ifdef CONSADDR
#define CONSADDR_VA	(CONSADDR - EXYNOS_CORE_PBASE + EXYNOS_CORE_VBASE)

	volatile uint32_t *uartaddr = cpu_earlydevice_va_p() ?
	    (volatile uint32_t *)CONSADDR_VA :
	    (volatile uint32_t *)CONSADDR;

	while ((uartaddr[SSCOM_UFSTAT / 4] & UFSTAT_TXFULL) != 0)
		;

	uartaddr[SSCOM_UTXH / 4] = c;
#endif
}

static void
exynos_platform_device_register(device_t self, void *aux)
{
	exynos_device_register(self, aux);
}

static void
exynos5_platform_reset(void)
{
	bus_space_tag_t bst = &armv7_generic_bs_tag;
	bus_space_handle_t bsh;

	bus_space_map(bst, EXYNOS5_SWRESET_REG, 4, 0, &bsh);
	bus_space_write_4(bst, bsh, 0, 1);
}

static u_int
exynos_platform_uart_freq(void)
{
	return EXYNOS_UART_FREQ;
}


#if defined(SOC_EXYNOS4)
static const struct pmap_devmap *
exynos4_platform_devmap(void)
{
	static const struct pmap_devmap devmap[] = {
		DEVMAP_ENTRY(EXYNOS_CORE_VBASE,
			     EXYNOS_CORE_PBASE,
			     EXYNOS4_CORE_SIZE),
		DEVMAP_ENTRY(EXYNOS4_AUDIOCORE_VBASE,
			     EXYNOS4_AUDIOCORE_PBASE,
			     EXYNOS4_AUDIOCORE_SIZE),
		DEVMAP_ENTRY_END
	};

	return devmap;
}

static const struct arm_platform exynos4_platform = {
	.ap_devmap = exynos4_platform_devmap,
	.ap_bootstrap = exynos_platform_bootstrap,
	.ap_init_attach_args = exynos_platform_init_attach_args,
	.ap_early_putchar = exynos_platform_early_putchar,
	.ap_device_register = exynos_platform_device_register,
	.ap_reset = exynos5_platform_reset,
	.ap_delay = mct_delay,
	.ap_uart_freq = exynos_platform_uart_freq,
};

ARM_PLATFORM(exynos4, "samsung,exynos4", &exynos4_platform);
#endif


#if defined(SOC_EXYNOS5)
static const struct pmap_devmap *
exynos5_platform_devmap(void)
{
	static const struct pmap_devmap devmap[] = {
		DEVMAP_ENTRY(EXYNOS_CORE_VBASE,
			     EXYNOS_CORE_PBASE,
			     EXYNOS5_CORE_SIZE),
		DEVMAP_ENTRY(EXYNOS5_AUDIOCORE_VBASE,
			     EXYNOS5_AUDIOCORE_PBASE,
			     EXYNOS5_AUDIOCORE_SIZE),
		DEVMAP_ENTRY(EXYNOS5_SYSRAM_VBASE,
			     EXYNOS5_SYSRAM_PBASE,
			     EXYNOS5_SYSRAM_SIZE),
		DEVMAP_ENTRY_END
	};

	return devmap;
}

static const struct arm_platform exynos5_platform = {
	.ap_devmap = exynos5_platform_devmap,
	.ap_bootstrap = exynos_platform_bootstrap,
	.ap_init_attach_args = exynos_platform_init_attach_args,
	.ap_early_putchar = exynos_platform_early_putchar,
	.ap_device_register = exynos_platform_device_register,
	.ap_reset = exynos5_platform_reset,
	.ap_delay = mct_delay,
	.ap_uart_freq = exynos_platform_uart_freq,
};

ARM_PLATFORM(exynos5, "samsung,exynos5", &exynos5_platform);
#endif