xref: /src/sys/arch/arm/acpi/acpi_platform.c

/* $NetBSD: acpi_platform.c,v 1.3 2018/10/15 20:09:06 jmcneill Exp $ */

/*-
 * Copyright (c) 2018 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jared McNeill <jmcneill (at) invisible.ca>.
 *
 * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: acpi_platform.c,v 1.3 2018/10/15 20:09:06 jmcneill 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 <arm/fdt/arm_fdtvar.h>

#include <uvm/uvm_extern.h>

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

#include <arm/cortex/gtmr_var.h>

#include <arm/arm/psci.h>
#include <arm/fdt/psci_fdtvar.h>

#include <evbarm/fdt/platform.h>

#include <evbarm/dev/plcomreg.h>
#include <evbarm/dev/plcomvar.h>
#include <dev/ic/ns16550reg.h>
#include <dev/ic/comreg.h>

#include <dev/acpi/acpireg.h>
#include <dev/acpi/acpivar.h>
#include <arch/arm/acpi/acpi_table.h>

#define	SPCR_INTERFACE_TYPE_PL011		0x0003
#define	SPCR_INTERFACE_TYPE_SBSA_32BIT		0x000d
#define	SPCR_INTERFACE_TYPE_SBSA_GENERIC	0x000e
#define	SPCR_INTERFACE_TYPE_BCM2835		0x0010

#define	SPCR_BAUD_UNKNOWN			0
#define	SPCR_BAUD_9600				3
#define	SPCR_BAUD_19200				4
#define	SPCR_BAUD_57600				6
#define	SPCR_BAUD_115200			7

extern struct bus_space arm_generic_bs_tag;

static struct plcom_instance plcom_console;

static const struct pmap_devmap *
acpi_platform_devmap(void)
{
	static const struct pmap_devmap devmap[] = {
		DEVMAP_ENTRY_END
	};

	return devmap;
}

static void
acpi_platform_bootstrap(void)
{
}

static void
acpi_platform_startup(void)
{
	ACPI_TABLE_SPCR *spcr;
	ACPI_TABLE_FADT *fadt;
	ACPI_TABLE_MADT *madt;
	int baud_rate;

	/*
	 * Setup serial console device
	 */
	if (ACPI_SUCCESS(acpi_table_find(ACPI_SIG_SPCR, (void **)&spcr))) {
		if (spcr->SerialPort.SpaceId == ACPI_ADR_SPACE_SYSTEM_MEMORY &&
		    spcr->SerialPort.Address != 0) {
			switch (spcr->InterfaceType) {
			case SPCR_INTERFACE_TYPE_PL011:
			case SPCR_INTERFACE_TYPE_SBSA_32BIT:
			case SPCR_INTERFACE_TYPE_SBSA_GENERIC:
			case SPCR_INTERFACE_TYPE_BCM2835:
				plcom_console.pi_type = PLCOM_TYPE_PL011;
				plcom_console.pi_iot = &arm_generic_bs_tag;
				plcom_console.pi_iobase = spcr->SerialPort.Address;
				plcom_console.pi_size = PL011COM_UART_SIZE;
				if (spcr->InterfaceType == SPCR_INTERFACE_TYPE_SBSA_32BIT) {
					plcom_console.pi_flags = PLC_FLAG_32BIT_ACCESS;
				} else {
					plcom_console.pi_flags = ACPI_ACCESS_BIT_WIDTH(spcr->SerialPort.AccessWidth) == 8 ?
					    0 : PLC_FLAG_32BIT_ACCESS;
				}
				switch (spcr->BaudRate) {
				case SPCR_BAUD_9600:
					baud_rate = 9600;
					break;
				case SPCR_BAUD_19200:
					baud_rate = 19200;
					break;
				case SPCR_BAUD_57600:
					baud_rate = 57600;
					break;
				case SPCR_BAUD_115200:
				case SPCR_BAUD_UNKNOWN:
				default:
					baud_rate = 115200;
					break;
				}

				plcomcnattach(&plcom_console, baud_rate, 0, TTYDEF_CFLAG, -1);
				break;
			}
		}
		acpi_table_unmap((ACPI_TABLE_HEADER *)spcr);
	}

	/*
	 * Initialize PSCI 0.2+ if implemented
	 */
	if (ACPI_SUCCESS(acpi_table_find(ACPI_SIG_FADT, (void **)&fadt))) {
		if (fadt->ArmBootFlags & ACPI_FADT_PSCI_COMPLIANT) {
			if (fadt->ArmBootFlags & ACPI_FADT_PSCI_USE_HVC) {
				psci_init(psci_call_hvc);
			} else {
				psci_init(psci_call_smc);
			}
		}
		acpi_table_unmap((ACPI_TABLE_HEADER *)fadt);
	}

	/*
	 * Count CPUs
	 */
	if (ACPI_SUCCESS(acpi_table_find(ACPI_SIG_MADT, (void **)&madt))) {
		char *end = (char *)madt + madt->Header.Length;
		char *where = (char *)madt + sizeof(ACPI_TABLE_MADT);
		while (where < end) {
			ACPI_SUBTABLE_HEADER *subtable = (ACPI_SUBTABLE_HEADER *)where;
			if (subtable->Type == ACPI_MADT_TYPE_GENERIC_INTERRUPT)
				arm_cpu_max++;
			where += subtable->Length;
		}
		acpi_table_unmap((ACPI_TABLE_HEADER *)madt);
	}
}

static void
acpi_platform_init_attach_args(struct fdt_attach_args *faa)
{
	extern struct arm32_bus_dma_tag arm_generic_dma_tag;
	extern struct bus_space arm_generic_bs_tag;
	extern struct bus_space arm_generic_a4x_bs_tag;

	faa->faa_bst = &arm_generic_bs_tag;
	faa->faa_a4x_bst = &arm_generic_a4x_bs_tag;
	faa->faa_dmat = &arm_generic_dma_tag;
}

static void
acpi_platform_early_putchar(char c)
{
}

static void
acpi_platform_device_register(device_t self, void *aux)
{
}

static void
acpi_platform_reset(void)
{
	if (psci_available())
		psci_system_reset();
}

static u_int
acpi_platform_uart_freq(void)
{
	return 0;
}

static const struct arm_platform acpi_platform = {
	.ap_devmap = acpi_platform_devmap,
	.ap_bootstrap = acpi_platform_bootstrap,
	.ap_startup = acpi_platform_startup,
	.ap_init_attach_args = acpi_platform_init_attach_args,
	.ap_early_putchar = acpi_platform_early_putchar,
	.ap_device_register = acpi_platform_device_register,
	.ap_reset = acpi_platform_reset,
	.ap_delay = gtmr_delay,
	.ap_uart_freq = acpi_platform_uart_freq,
};

ARM_PLATFORM(virt, "netbsd,generic-acpi", &acpi_platform);