/* $NetBSD: acpi_fdt.c,v 1.12 2019/06/22 19:47:27 jmcneill Exp $ */

/*-
 * Copyright (c) 2015-2017 Jared McNeill <jmcneill@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 "pci.h"
#include "opt_efi.h"

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: acpi_fdt.c,v 1.12 2019/06/22 19:47:27 jmcneill Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/device.h>
#include <sys/intr.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lwp.h>
#include <sys/kmem.h>
#include <sys/queue.h>
#include <sys/sysctl.h>

#include <dev/fdt/fdtvar.h>

#include <dev/acpi/acpivar.h>
#include <dev/pci/pcivar.h>

#include <arm/arm/psci.h>

#include <arm/acpi/acpi_pci_machdep.h>

#ifdef EFI_RUNTIME
#include <arm/arm/efi_runtime.h>
#include <dev/clock_subr.h>
#endif

static int	acpi_fdt_match(device_t, cfdata_t, void *);
static void	acpi_fdt_attach(device_t, device_t, void *);

static void	acpi_fdt_poweroff(device_t);

#ifdef EFI_RUNTIME
static void	acpi_fdt_efi_init(device_t);
static int	acpi_fdt_efi_rtc_gettime(todr_chip_handle_t, struct clock_ymdhms *);
static int	acpi_fdt_efi_rtc_settime(todr_chip_handle_t, struct clock_ymdhms *);
#endif

static void	acpi_fdt_sysctl_init(void);

extern struct arm32_bus_dma_tag acpi_coherent_dma_tag;

#if NPCI > 0
static struct acpi_pci_context acpi_fdt_pci_context;
#endif

static uint64_t smbios_table = 0;

#ifdef EFI_RUNTIME
static struct todr_chip_handle efi_todr;
#endif

static const char * const compatible[] = {
	"netbsd,acpi",
	NULL
};

static const struct fdtbus_power_controller_func acpi_fdt_power_funcs = {
	.poweroff = acpi_fdt_poweroff,
};

CFATTACH_DECL_NEW(acpi_fdt, 0, acpi_fdt_match, acpi_fdt_attach, NULL, NULL);

static int
acpi_fdt_match(device_t parent, cfdata_t cf, void *aux)
{
	struct fdt_attach_args * const faa = aux;

	return of_compatible(faa->faa_phandle, compatible) >= 0;
}

static void
acpi_fdt_attach(device_t parent, device_t self, void *aux)
{
	struct fdt_attach_args * const faa = aux;
	struct acpibus_attach_args aa;

	aprint_naive("\n");
	aprint_normal("\n");

#ifdef EFI_RUNTIME
	acpi_fdt_efi_init(self);
#endif

	fdtbus_register_power_controller(self, faa->faa_phandle,
	    &acpi_fdt_power_funcs);

	if (!acpi_probe())
		aprint_error_dev(self, "failed to probe ACPI\n");

	memset(&aa, 0, sizeof(aa));
#if NPCI > 0
	acpi_fdt_pci_context.ap_pc = arm_acpi_pci_chipset;
	acpi_fdt_pci_context.ap_pc.pc_conf_v = &acpi_fdt_pci_context;
	acpi_fdt_pci_context.ap_seg = 0;
	aa.aa_pciflags =
	    /*PCI_FLAGS_IO_OKAY |*/ PCI_FLAGS_MEM_OKAY |
	    PCI_FLAGS_MRL_OKAY | PCI_FLAGS_MRM_OKAY | 
	    PCI_FLAGS_MWI_OKAY;
#ifdef __HAVE_PCI_MSI_MSIX
	aa.aa_pciflags |= PCI_FLAGS_MSI_OKAY | PCI_FLAGS_MSIX_OKAY;
#endif
	aa.aa_pc = &acpi_fdt_pci_context.ap_pc;
#endif

	aa.aa_memt = faa->faa_bst;
	aa.aa_dmat = &acpi_coherent_dma_tag;
#ifdef _PCI_HAVE_DMA64
	aa.aa_dmat64 = &acpi_coherent_dma_tag;
#endif
	config_found_ia(self, "acpibus", &aa, 0);

	acpi_fdt_sysctl_init();
}

static void
acpi_fdt_poweroff(device_t dev)
{
	delay(500000);
#ifdef EFI_RUNTIME
	if (arm_efirt_reset(EFI_RESET_SHUTDOWN) == 0)
		return;
#endif
	if (psci_available())
		psci_system_off();
}

static void
acpi_fdt_sysctl_init(void)
{
	const struct sysctlnode *rnode;
	int error;

	const int chosen = OF_finddevice("/chosen");
	if (chosen >= 0)
		of_getprop_uint64(chosen, "netbsd,smbios-table", &smbios_table);

	error = sysctl_createv(NULL, 0, NULL, &rnode,
	    CTLFLAG_PERMANENT, CTLTYPE_NODE, "machdep", NULL,
	    NULL, 0, NULL, 0, CTL_MACHDEP, CTL_EOL);
	if (error)
		return;

	if (smbios_table != 0) {
		(void)sysctl_createv(NULL, 0, &rnode, NULL,
		    CTLFLAG_PERMANENT | CTLFLAG_READONLY | CTLFLAG_HEX, CTLTYPE_QUAD,
		    "smbios", SYSCTL_DESCR("SMBIOS table pointer"),
		    NULL, 0, &smbios_table, sizeof(smbios_table),
		    CTL_CREATE, CTL_EOL);
	}
}

#ifdef EFI_RUNTIME
static void
acpi_fdt_efi_init(device_t dev)
{
	uint64_t efi_system_table;
	struct efi_tm tm;
	int error;

	const int chosen = OF_finddevice("/chosen");
	if (chosen < 0)
		return;

	if (of_getprop_uint64(chosen, "netbsd,uefi-system-table", &efi_system_table) != 0)
		return;

	error = arm_efirt_init(efi_system_table);
	if (error)
		return;

	aprint_debug_dev(dev, "EFI system table at %#" PRIx64 "\n", efi_system_table);

	if (arm_efirt_gettime(&tm) == 0) {
		aprint_normal_dev(dev, "using EFI runtime services for RTC\n");
		efi_todr.cookie = NULL;
		efi_todr.todr_gettime_ymdhms = acpi_fdt_efi_rtc_gettime;
		efi_todr.todr_settime_ymdhms = acpi_fdt_efi_rtc_settime;
		todr_attach(&efi_todr);
	}
}

static int
acpi_fdt_efi_rtc_gettime(todr_chip_handle_t tch, struct clock_ymdhms *dt)
{
	struct efi_tm tm;
	int error;

	error = arm_efirt_gettime(&tm);
	if (error)
		return error;

	dt->dt_year = tm.tm_year;
	dt->dt_mon = tm.tm_mon;
	dt->dt_day = tm.tm_mday;
	dt->dt_wday = 0;
	dt->dt_hour = tm.tm_hour;
	dt->dt_min = tm.tm_min;
	dt->dt_sec = tm.tm_sec;

	return 0;
}

static int
acpi_fdt_efi_rtc_settime(todr_chip_handle_t tch, struct clock_ymdhms *dt)
{
	struct efi_tm tm;

	memset(&tm, 0, sizeof(tm));
	tm.tm_year = dt->dt_year;
	tm.tm_mon = dt->dt_mon;
	tm.tm_mday = dt->dt_day;
	tm.tm_hour = dt->dt_hour;
	tm.tm_min = dt->dt_min;
	tm.tm_sec = dt->dt_sec;

	return arm_efirt_settime(&tm);
}
#endif