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/*
* Copyright (C) 2010 Google, Inc.
*
* Author:
* Colin Cross <ccross@google.com>
*
* Copyright (C) 2010, NVIDIA Corporation
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <asm/hardware/gic.h>
#include <mach/iomap.h>
#include <mach/legacy_irq.h>
#include <mach/suspend.h>
#include "board.h"
#define PMC_CTRL 0x0
#define PMC_CTRL_LATCH_WAKEUPS (1 << 5)
#define PMC_WAKE_MASK 0xc
#define PMC_WAKE_LEVEL 0x10
#define PMC_WAKE_STATUS 0x14
#define PMC_SW_WAKE_STATUS 0x18
#define PMC_DPD_SAMPLE 0x20
static void __iomem *pmc = IO_ADDRESS(TEGRA_PMC_BASE);
static u32 tegra_lp0_wake_enb;
static u32 tegra_lp0_wake_level;
static u32 tegra_lp0_wake_level_any;
static void (*tegra_gic_mask_irq)(struct irq_data *d);
static void (*tegra_gic_unmask_irq)(struct irq_data *d);
static void (*tegra_gic_ack_irq)(struct irq_data *d);
/* ensures that sufficient time is passed for a register write to
* serialize into the 32KHz domain */
static void pmc_32kwritel(u32 val, unsigned long offs)
{
writel(val, pmc + offs);
udelay(130);
}
int tegra_set_lp1_wake(int irq, int enable)
{
return tegra_legacy_irq_set_wake(irq, enable);
}
void tegra_set_lp0_wake_pads(u32 wake_enb, u32 wake_level, u32 wake_any)
{
u32 temp;
u32 status;
u32 lvl;
wake_level &= wake_enb;
wake_any &= wake_enb;
wake_level |= (tegra_lp0_wake_level & tegra_lp0_wake_enb);
wake_any |= (tegra_lp0_wake_level_any & tegra_lp0_wake_enb);
wake_enb |= tegra_lp0_wake_enb;
pmc_32kwritel(0, PMC_SW_WAKE_STATUS);
temp = readl(pmc + PMC_CTRL);
temp |= PMC_CTRL_LATCH_WAKEUPS;
pmc_32kwritel(temp, PMC_CTRL);
temp &= ~PMC_CTRL_LATCH_WAKEUPS;
pmc_32kwritel(temp, PMC_CTRL);
status = readl(pmc + PMC_SW_WAKE_STATUS);
lvl = readl(pmc + PMC_WAKE_LEVEL);
/* flip the wakeup trigger for any-edge triggered pads
* which are currently asserting as wakeups */
lvl ^= status;
lvl &= wake_any;
wake_level |= lvl;
writel(wake_level, pmc + PMC_WAKE_LEVEL);
/* Enable DPD sample to trigger sampling pads data and direction
* in which pad will be driven during lp0 mode*/
writel(0x1, pmc + PMC_DPD_SAMPLE);
writel(wake_enb, pmc + PMC_WAKE_MASK);
}
static void tegra_mask(struct irq_data *d)
{
tegra_gic_mask_irq(d);
tegra_legacy_mask_irq(d->irq);
}
static void tegra_unmask(struct irq_data *d)
{
tegra_gic_unmask_irq(d);
tegra_legacy_unmask_irq(d->irq);
}
static void tegra_ack(struct irq_data *d)
{
tegra_legacy_force_irq_clr(d->irq);
tegra_gic_ack_irq(d);
}
static int tegra_retrigger(struct irq_data *d)
{
tegra_legacy_force_irq_set(d->irq);
return 1;
}
static struct irq_chip tegra_irq = {
.name = "PPI",
.irq_ack = tegra_ack,
.irq_mask = tegra_mask,
.irq_unmask = tegra_unmask,
.irq_retrigger = tegra_retrigger,
};
void __init tegra_init_irq(void)
{
struct irq_chip *gic;
unsigned int i;
int irq;
tegra_init_legacy_irq();
gic_init(0, 29, IO_ADDRESS(TEGRA_ARM_INT_DIST_BASE),
IO_ADDRESS(TEGRA_ARM_PERIF_BASE + 0x100));
gic = irq_get_chip(29);
tegra_gic_unmask_irq = gic->irq_unmask;
tegra_gic_mask_irq = gic->irq_mask;
tegra_gic_ack_irq = gic->irq_ack;
#ifdef CONFIG_SMP
tegra_irq.irq_set_affinity = gic->irq_set_affinity;
#endif
for (i = 0; i < INT_MAIN_NR; i++) {
irq = INT_PRI_BASE + i;
irq_set_chip(irq, &tegra_irq);
irq_set_handler(irq, handle_level_irq);
set_irq_flags(irq, IRQF_VALID);
}
}
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