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linux/arch/arm/mach-lpc32xx/irq.c
Kevin Wells c4a0208fff ARM: LPC32XX: GPIO, timer, and IRQ drivers 
Common drivers for the LPC32XX used on all platforms

Signed-off-by: Kevin Wells <wellsk40@gmail.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
2010-07-27 03:08:09 -07:00

433 lines
11 KiB
C
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/*
* arch/arm/mach-lpc32xx/irq.c
*
* Author: Kevin Wells <kevin.wells@nxp.com>
*
* Copyright (C) 2010 NXP Semiconductors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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/types.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/err.h>
#include <linux/io.h>
#include <mach/irqs.h>
#include <mach/hardware.h>
#include <mach/platform.h>
#include "common.h"
/*
* Default value representing the Activation polarity of all internal
* interrupt sources
*/
#define MIC_APR_DEFAULT 0x3FF0EFE0
#define SIC1_APR_DEFAULT 0xFBD27186
#define SIC2_APR_DEFAULT 0x801810C0
/*
* Default value representing the Activation Type of all internal
* interrupt sources. All are level sensitive.
*/
#define MIC_ATR_DEFAULT 0x00000000
#define SIC1_ATR_DEFAULT 0x00026000
#define SIC2_ATR_DEFAULT 0x00000000
struct lpc32xx_event_group_regs {
void __iomem *enab_reg;
void __iomem *edge_reg;
void __iomem *maskstat_reg;
void __iomem *rawstat_reg;
};
static const struct lpc32xx_event_group_regs lpc32xx_event_int_regs = {
.enab_reg = LPC32XX_CLKPWR_INT_ER,
.edge_reg = LPC32XX_CLKPWR_INT_AP,
.maskstat_reg = LPC32XX_CLKPWR_INT_SR,
.rawstat_reg = LPC32XX_CLKPWR_INT_RS,
};
static const struct lpc32xx_event_group_regs lpc32xx_event_pin_regs = {
.enab_reg = LPC32XX_CLKPWR_PIN_ER,
.edge_reg = LPC32XX_CLKPWR_PIN_AP,
.maskstat_reg = LPC32XX_CLKPWR_PIN_SR,
.rawstat_reg = LPC32XX_CLKPWR_PIN_RS,
};
struct lpc32xx_event_info {
const struct lpc32xx_event_group_regs *event_group;
u32 mask;
};
/*
* Maps an IRQ number to and event mask and register
*/
static const struct lpc32xx_event_info lpc32xx_events[NR_IRQS] = {
[IRQ_LPC32XX_GPI_08] = {
.event_group = &lpc32xx_event_pin_regs,
.mask = LPC32XX_CLKPWR_EXTSRC_GPI_08_BIT,
},
[IRQ_LPC32XX_GPI_09] = {
.event_group = &lpc32xx_event_pin_regs,
.mask = LPC32XX_CLKPWR_EXTSRC_GPI_09_BIT,
},
[IRQ_LPC32XX_GPI_19] = {
.event_group = &lpc32xx_event_pin_regs,
.mask = LPC32XX_CLKPWR_EXTSRC_GPI_19_BIT,
},
[IRQ_LPC32XX_GPI_07] = {
.event_group = &lpc32xx_event_pin_regs,
.mask = LPC32XX_CLKPWR_EXTSRC_GPI_07_BIT,
},
[IRQ_LPC32XX_GPI_00] = {
.event_group = &lpc32xx_event_pin_regs,
.mask = LPC32XX_CLKPWR_EXTSRC_GPI_00_BIT,
},
[IRQ_LPC32XX_GPI_01] = {
.event_group = &lpc32xx_event_pin_regs,
.mask = LPC32XX_CLKPWR_EXTSRC_GPI_01_BIT,
},
[IRQ_LPC32XX_GPI_02] = {
.event_group = &lpc32xx_event_pin_regs,
.mask = LPC32XX_CLKPWR_EXTSRC_GPI_02_BIT,
},
[IRQ_LPC32XX_GPI_03] = {
.event_group = &lpc32xx_event_pin_regs,
.mask = LPC32XX_CLKPWR_EXTSRC_GPI_03_BIT,
},
[IRQ_LPC32XX_GPI_04] = {
.event_group = &lpc32xx_event_pin_regs,
.mask = LPC32XX_CLKPWR_EXTSRC_GPI_04_BIT,
},
[IRQ_LPC32XX_GPI_05] = {
.event_group = &lpc32xx_event_pin_regs,
.mask = LPC32XX_CLKPWR_EXTSRC_GPI_05_BIT,
},
[IRQ_LPC32XX_GPI_06] = {
.event_group = &lpc32xx_event_pin_regs,
.mask = LPC32XX_CLKPWR_EXTSRC_GPI_06_BIT,
},
[IRQ_LPC32XX_GPIO_00] = {
.event_group = &lpc32xx_event_int_regs,
.mask = LPC32XX_CLKPWR_INTSRC_GPIO_00_BIT,
},
[IRQ_LPC32XX_GPIO_01] = {
.event_group = &lpc32xx_event_int_regs,
.mask = LPC32XX_CLKPWR_INTSRC_GPIO_01_BIT,
},
[IRQ_LPC32XX_GPIO_02] = {
.event_group = &lpc32xx_event_int_regs,
.mask = LPC32XX_CLKPWR_INTSRC_GPIO_02_BIT,
},
[IRQ_LPC32XX_GPIO_03] = {
.event_group = &lpc32xx_event_int_regs,
.mask = LPC32XX_CLKPWR_INTSRC_GPIO_03_BIT,
},
[IRQ_LPC32XX_GPIO_04] = {
.event_group = &lpc32xx_event_int_regs,
.mask = LPC32XX_CLKPWR_INTSRC_GPIO_04_BIT,
},
[IRQ_LPC32XX_GPIO_05] = {
.event_group = &lpc32xx_event_int_regs,
.mask = LPC32XX_CLKPWR_INTSRC_GPIO_05_BIT,
},
[IRQ_LPC32XX_KEY] = {
.event_group = &lpc32xx_event_int_regs,
.mask = LPC32XX_CLKPWR_INTSRC_KEY_BIT,
},
[IRQ_LPC32XX_USB_OTG_ATX] = {
.event_group = &lpc32xx_event_int_regs,
.mask = LPC32XX_CLKPWR_INTSRC_USBATXINT_BIT,
},
[IRQ_LPC32XX_USB_HOST] = {
.event_group = &lpc32xx_event_int_regs,
.mask = LPC32XX_CLKPWR_INTSRC_USB_BIT,
},
[IRQ_LPC32XX_RTC] = {
.event_group = &lpc32xx_event_int_regs,
.mask = LPC32XX_CLKPWR_INTSRC_RTC_BIT,
},
[IRQ_LPC32XX_MSTIMER] = {
.event_group = &lpc32xx_event_int_regs,
.mask = LPC32XX_CLKPWR_INTSRC_MSTIMER_BIT,
},
[IRQ_LPC32XX_TS_AUX] = {
.event_group = &lpc32xx_event_int_regs,
.mask = LPC32XX_CLKPWR_INTSRC_TS_AUX_BIT,
},
[IRQ_LPC32XX_TS_P] = {
.event_group = &lpc32xx_event_int_regs,
.mask = LPC32XX_CLKPWR_INTSRC_TS_P_BIT,
},
[IRQ_LPC32XX_TS_IRQ] = {
.event_group = &lpc32xx_event_int_regs,
.mask = LPC32XX_CLKPWR_INTSRC_ADC_BIT,
},
};
static void get_controller(unsigned int irq, unsigned int *base,
unsigned int *irqbit)
{
if (irq < 32) {
*base = LPC32XX_MIC_BASE;
*irqbit = 1 << irq;
} else if (irq < 64) {
*base = LPC32XX_SIC1_BASE;
*irqbit = 1 << (irq - 32);
} else {
*base = LPC32XX_SIC2_BASE;
*irqbit = 1 << (irq - 64);
}
}
static void lpc32xx_mask_irq(unsigned int irq)
{
unsigned int reg, ctrl, mask;
get_controller(irq, &ctrl, &mask);
reg = __raw_readl(LPC32XX_INTC_MASK(ctrl)) & ~mask;
__raw_writel(reg, LPC32XX_INTC_MASK(ctrl));
}
static void lpc32xx_unmask_irq(unsigned int irq)
{
unsigned int reg, ctrl, mask;
get_controller(irq, &ctrl, &mask);
reg = __raw_readl(LPC32XX_INTC_MASK(ctrl)) | mask;
__raw_writel(reg, LPC32XX_INTC_MASK(ctrl));
}
static void lpc32xx_ack_irq(unsigned int irq)
{
unsigned int ctrl, mask;
get_controller(irq, &ctrl, &mask);
__raw_writel(mask, LPC32XX_INTC_RAW_STAT(ctrl));
/* Also need to clear pending wake event */
if (lpc32xx_events[irq].mask != 0)
__raw_writel(lpc32xx_events[irq].mask,
lpc32xx_events[irq].event_group->rawstat_reg);
}
static void __lpc32xx_set_irq_type(unsigned int irq, int use_high_level,
int use_edge)
{
unsigned int reg, ctrl, mask;
get_controller(irq, &ctrl, &mask);
/* Activation level, high or low */
reg = __raw_readl(LPC32XX_INTC_POLAR(ctrl));
if (use_high_level)
reg |= mask;
else
reg &= ~mask;
__raw_writel(reg, LPC32XX_INTC_POLAR(ctrl));
/* Activation type, edge or level */
reg = __raw_readl(LPC32XX_INTC_ACT_TYPE(ctrl));
if (use_edge)
reg |= mask;
else
reg &= ~mask;
__raw_writel(reg, LPC32XX_INTC_ACT_TYPE(ctrl));
/* Use same polarity for the wake events */
if (lpc32xx_events[irq].mask != 0) {
reg = __raw_readl(lpc32xx_events[irq].event_group->edge_reg);
if (use_high_level)
reg |= lpc32xx_events[irq].mask;
else
reg &= ~lpc32xx_events[irq].mask;
__raw_writel(reg, lpc32xx_events[irq].event_group->edge_reg);
}
}
static int lpc32xx_set_irq_type(unsigned int irq, unsigned int type)
{
switch (type) {
case IRQ_TYPE_EDGE_RISING:
/* Rising edge sensitive */
__lpc32xx_set_irq_type(irq, 1, 1);
break;
case IRQ_TYPE_EDGE_FALLING:
/* Falling edge sensitive */
__lpc32xx_set_irq_type(irq, 0, 1);
break;
case IRQ_TYPE_LEVEL_LOW:
/* Low level sensitive */
__lpc32xx_set_irq_type(irq, 0, 0);
break;
case IRQ_TYPE_LEVEL_HIGH:
/* High level sensitive */
__lpc32xx_set_irq_type(irq, 1, 0);
break;
/* Other modes are not supported */
default:
return -EINVAL;
}
/* Ok to use the level handler for all types */
set_irq_handler(irq, handle_level_irq);
return 0;
}
static int lpc32xx_irq_wake(unsigned int irqno, unsigned int state)
{
unsigned long eventreg;
if (lpc32xx_events[irqno].mask != 0) {
eventreg = __raw_readl(lpc32xx_events[irqno].
event_group->enab_reg);
if (state)
eventreg |= lpc32xx_events[irqno].mask;
else
eventreg &= ~lpc32xx_events[irqno].mask;
__raw_writel(eventreg,
lpc32xx_events[irqno].event_group->enab_reg);
return 0;
}
/* Clear event */
__raw_writel(lpc32xx_events[irqno].mask,
lpc32xx_events[irqno].event_group->rawstat_reg);
return -ENODEV;
}
static void __init lpc32xx_set_default_mappings(unsigned int apr,
unsigned int atr, unsigned int offset)
{
unsigned int i;
/* Set activation levels for each interrupt */
i = 0;
while (i < 32) {
__lpc32xx_set_irq_type(offset + i, ((apr >> i) & 0x1),
((atr >> i) & 0x1));
i++;
}
}
static struct irq_chip lpc32xx_irq_chip = {
.ack = lpc32xx_ack_irq,
.mask = lpc32xx_mask_irq,
.unmask = lpc32xx_unmask_irq,
.set_type = lpc32xx_set_irq_type,
.set_wake = lpc32xx_irq_wake
};
static void lpc32xx_sic1_handler(unsigned int irq, struct irq_desc *desc)
{
unsigned long ints = __raw_readl(LPC32XX_INTC_STAT(LPC32XX_SIC1_BASE));
while (ints != 0) {
int irqno = fls(ints) - 1;
ints &= ~(1 << irqno);
generic_handle_irq(LPC32XX_SIC1_IRQ(irqno));
}
}
static void lpc32xx_sic2_handler(unsigned int irq, struct irq_desc *desc)
{
unsigned long ints = __raw_readl(LPC32XX_INTC_STAT(LPC32XX_SIC2_BASE));
while (ints != 0) {
int irqno = fls(ints) - 1;
ints &= ~(1 << irqno);
generic_handle_irq(LPC32XX_SIC2_IRQ(irqno));
}
}
void __init lpc32xx_init_irq(void)
{
unsigned int i;
/* Setup MIC */
__raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_MIC_BASE));
__raw_writel(MIC_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_MIC_BASE));
__raw_writel(MIC_ATR_DEFAULT, LPC32XX_INTC_ACT_TYPE(LPC32XX_MIC_BASE));
/* Setup SIC1 */
__raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC1_BASE));
__raw_writel(MIC_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_SIC1_BASE));
__raw_writel(MIC_ATR_DEFAULT, LPC32XX_INTC_ACT_TYPE(LPC32XX_SIC1_BASE));
/* Setup SIC2 */
__raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC2_BASE));
__raw_writel(MIC_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_SIC2_BASE));
__raw_writel(MIC_ATR_DEFAULT, LPC32XX_INTC_ACT_TYPE(LPC32XX_SIC2_BASE));
/* Configure supported IRQ's */
for (i = 0; i < NR_IRQS; i++) {
set_irq_chip(i, &lpc32xx_irq_chip);
set_irq_handler(i, handle_level_irq);
set_irq_flags(i, IRQF_VALID);
}
/* Set default mappings */
lpc32xx_set_default_mappings(MIC_APR_DEFAULT, MIC_ATR_DEFAULT, 0);
lpc32xx_set_default_mappings(SIC1_APR_DEFAULT, SIC1_ATR_DEFAULT, 32);
lpc32xx_set_default_mappings(SIC2_APR_DEFAULT, SIC2_ATR_DEFAULT, 64);
/* mask all interrupts except SUBIRQ */
__raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_MIC_BASE));
__raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC1_BASE));
__raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC2_BASE));
/* MIC SUBIRQx interrupts will route handling to the chain handlers */
set_irq_chained_handler(IRQ_LPC32XX_SUB1IRQ, lpc32xx_sic1_handler);
set_irq_chained_handler(IRQ_LPC32XX_SUB2IRQ, lpc32xx_sic2_handler);
/* Initially disable all wake events */
__raw_writel(0, LPC32XX_CLKPWR_P01_ER);
__raw_writel(0, LPC32XX_CLKPWR_INT_ER);
__raw_writel(0, LPC32XX_CLKPWR_PIN_ER);
/*
* Default wake activation polarities, all pin sources are low edge
* triggered
*/
__raw_writel(LPC32XX_CLKPWR_INTSRC_TS_P_BIT |
LPC32XX_CLKPWR_INTSRC_MSTIMER_BIT |
LPC32XX_CLKPWR_INTSRC_RTC_BIT,
LPC32XX_CLKPWR_INT_AP);
__raw_writel(0, LPC32XX_CLKPWR_PIN_AP);
/* Clear latched wake event states */
__raw_writel(__raw_readl(LPC32XX_CLKPWR_PIN_RS),
LPC32XX_CLKPWR_PIN_RS);
__raw_writel(__raw_readl(LPC32XX_CLKPWR_INT_RS),
LPC32XX_CLKPWR_INT_RS);
}
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