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i.MX31ADS: Add CPLD interrupts demultiplexing (take 3).

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Needed for 8250 serial port and CS89x0 ethernet interface.

Signed-off-by: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Gilles Chanteperdrix 2008-09-09 10:19:42 +02:00 committed by Sascha Hauer
parent 0741794c0d
commit d7568f79d5
2 changed files with 93 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

91
arch/arm/mach-mx3/mx31ads.c
View File

@ -22,6 +22,7 @@
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/serial_8250.h>
#include <linux/irq.h>
#include <mach/hardware.h>
#include <asm/mach-types.h>
@ -106,6 +107,88 @@ static inline void mxc_init_imx_uart(void)
}
#endif /* !SERIAL_IMX */
static void mx31ads_expio_irq_handler(u32 irq, struct irq_desc *desc)
{
u32 imr_val;
u32 int_valid;
u32 expio_irq;
imr_val = __raw_readw(PBC_INTMASK_SET_REG);
int_valid = __raw_readw(PBC_INTSTATUS_REG) & imr_val;
expio_irq = MXC_EXP_IO_BASE;
for (; int_valid != 0; int_valid >>= 1, expio_irq++) {
if ((int_valid & 1) == 0)
continue;
generic_handle_irq(expio_irq);
}
}
/*
* Disable an expio pin's interrupt by setting the bit in the imr.
* @param irq an expio virtual irq number
*/
static void expio_mask_irq(u32 irq)
{
u32 expio = MXC_IRQ_TO_EXPIO(irq);
/* mask the interrupt */
__raw_writew(1 << expio, PBC_INTMASK_CLEAR_REG);
__raw_readw(PBC_INTMASK_CLEAR_REG);
}
/*
* Acknowledge an expanded io pin's interrupt by clearing the bit in the isr.
* @param irq an expanded io virtual irq number
*/
static void expio_ack_irq(u32 irq)
{
u32 expio = MXC_IRQ_TO_EXPIO(irq);
/* clear the interrupt status */
__raw_writew(1 << expio, PBC_INTSTATUS_REG);
}
/*
* Enable a expio pin's interrupt by clearing the bit in the imr.
* @param irq a expio virtual irq number
*/
static void expio_unmask_irq(u32 irq)
{
u32 expio = MXC_IRQ_TO_EXPIO(irq);
/* unmask the interrupt */
__raw_writew(1 << expio, PBC_INTMASK_SET_REG);
}
static struct irq_chip expio_irq_chip = {
.ack = expio_ack_irq,
.mask = expio_mask_irq,
.unmask = expio_unmask_irq,
};
static void __init mx31ads_init_expio(void)
{
int i;
printk(KERN_INFO "MX31ADS EXPIO(CPLD) hardware\n");
/*
* Configure INT line as GPIO input
*/
mxc_iomux_mode(IOMUX_MODE(MX31_PIN_GPIO1_4, IOMUX_CONFIG_GPIO));
/* disable the interrupt and clear the status */
__raw_writew(0xFFFF, PBC_INTMASK_CLEAR_REG);
__raw_writew(0xFFFF, PBC_INTSTATUS_REG);
for (i = MXC_EXP_IO_BASE; i < (MXC_EXP_IO_BASE + MXC_MAX_EXP_IO_LINES);
i++) {
set_irq_chip(i, &expio_irq_chip);
set_irq_handler(i, handle_level_irq);
set_irq_flags(i, IRQF_VALID);
}
set_irq_type(EXPIO_PARENT_INT, IRQ_TYPE_LEVEL_HIGH);
set_irq_chained_handler(EXPIO_PARENT_INT, mx31ads_expio_irq_handler);
}
/*!
* This structure defines static mappings for the i.MX31ADS board.
*/
@ -142,6 +225,12 @@ void __init mx31ads_map_io(void)
iotable_init(mx31ads_io_desc, ARRAY_SIZE(mx31ads_io_desc));
}
void __init mx31ads_init_irq(void)
{
mxc_init_irq();
mx31ads_init_expio();
}
/*!
* Board specific initialization.
*/
@ -171,7 +260,7 @@ MACHINE_START(MX31ADS, "Freescale MX31ADS")
.io_pg_offst = ((AIPS1_BASE_ADDR_VIRT) >> 18) & 0xfffc,
.boot_params = PHYS_OFFSET + 0x100,
.map_io = mx31ads_map_io,
.init_irq = mxc_init_irq,
.init_irq = mx31ads_init_irq,
.init_machine = mxc_board_init,
.timer = &mx31ads_timer,
MACHINE_END

3
arch/arm/plat-mxc/include/mach/board-mx31ads.h
View File

@ -90,6 +90,9 @@
#define PBC_INTMASK_CLEAR_REG (PBC_INTMASK_CLEAR + PBC_BASE_ADDRESS)
#define EXPIO_PARENT_INT IOMUX_TO_IRQ(MX31_PIN_GPIO1_4)
#define MXC_EXP_IO_BASE (MXC_MAX_INT_LINES + MXC_MAX_GPIO_LINES)
#define MXC_IRQ_TO_EXPIO(irq) ((irq) - MXC_EXP_IO_BASE)
#define EXPIO_INT_LOW_BAT (MXC_EXP_IO_BASE + 0)
#define EXPIO_INT_PB_IRQ (MXC_EXP_IO_BASE + 1)
#define EXPIO_INT_OTG_FS_OVR (MXC_EXP_IO_BASE + 2)