382 lines
11 KiB
C
382 lines
11 KiB
C
/*
|
|
* twl6030-irq.c - TWL6030 irq support
|
|
*
|
|
* Copyright (C) 2005-2009 Texas Instruments, Inc.
|
|
*
|
|
* Modifications to defer interrupt handling to a kernel thread:
|
|
* Copyright (C) 2006 MontaVista Software, Inc.
|
|
*
|
|
* Based on tlv320aic23.c:
|
|
* Copyright (c) by Kai Svahn <kai.svahn@nokia.com>
|
|
*
|
|
* Code cleanup and modifications to IRQ handler.
|
|
* by syed khasim <x0khasim@ti.com>
|
|
*
|
|
* TWL6030 specific code and IRQ handling changes by
|
|
* Jagadeesh Bhaskar Pakaravoor <j-pakaravoor@ti.com>
|
|
* Balaji T K <balajitk@ti.com>
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/i2c/twl.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#include "twl-core.h"
|
|
|
|
/*
|
|
* TWL6030 (unlike its predecessors, which had two level interrupt handling)
|
|
* three interrupt registers INT_STS_A, INT_STS_B and INT_STS_C.
|
|
* It exposes status bits saying who has raised an interrupt. There are
|
|
* three mask registers that corresponds to these status registers, that
|
|
* enables/disables these interrupts.
|
|
*
|
|
* We set up IRQs starting at a platform-specified base. An interrupt map table,
|
|
* specifies mapping between interrupt number and the associated module.
|
|
*
|
|
*/
|
|
|
|
static int twl6030_interrupt_mapping[24] = {
|
|
PWR_INTR_OFFSET, /* Bit 0 PWRON */
|
|
PWR_INTR_OFFSET, /* Bit 1 RPWRON */
|
|
PWR_INTR_OFFSET, /* Bit 2 BAT_VLOW */
|
|
RTC_INTR_OFFSET, /* Bit 3 RTC_ALARM */
|
|
RTC_INTR_OFFSET, /* Bit 4 RTC_PERIOD */
|
|
HOTDIE_INTR_OFFSET, /* Bit 5 HOT_DIE */
|
|
SMPSLDO_INTR_OFFSET, /* Bit 6 VXXX_SHORT */
|
|
SMPSLDO_INTR_OFFSET, /* Bit 7 VMMC_SHORT */
|
|
|
|
SMPSLDO_INTR_OFFSET, /* Bit 8 VUSIM_SHORT */
|
|
BATDETECT_INTR_OFFSET, /* Bit 9 BAT */
|
|
SIMDETECT_INTR_OFFSET, /* Bit 10 SIM */
|
|
MMCDETECT_INTR_OFFSET, /* Bit 11 MMC */
|
|
RSV_INTR_OFFSET, /* Bit 12 Reserved */
|
|
MADC_INTR_OFFSET, /* Bit 13 GPADC_RT_EOC */
|
|
MADC_INTR_OFFSET, /* Bit 14 GPADC_SW_EOC */
|
|
GASGAUGE_INTR_OFFSET, /* Bit 15 CC_AUTOCAL */
|
|
|
|
USBOTG_INTR_OFFSET, /* Bit 16 ID_WKUP */
|
|
USBOTG_INTR_OFFSET, /* Bit 17 VBUS_WKUP */
|
|
USBOTG_INTR_OFFSET, /* Bit 18 ID */
|
|
USB_PRES_INTR_OFFSET, /* Bit 19 VBUS */
|
|
CHARGER_INTR_OFFSET, /* Bit 20 CHRG_CTRL */
|
|
CHARGER_INTR_OFFSET, /* Bit 21 EXT_CHRG */
|
|
CHARGER_INTR_OFFSET, /* Bit 22 INT_CHRG */
|
|
RSV_INTR_OFFSET, /* Bit 23 Reserved */
|
|
};
|
|
/*----------------------------------------------------------------------*/
|
|
|
|
static unsigned twl6030_irq_base;
|
|
|
|
static struct completion irq_event;
|
|
|
|
/*
|
|
* This thread processes interrupts reported by the Primary Interrupt Handler.
|
|
*/
|
|
static int twl6030_irq_thread(void *data)
|
|
{
|
|
long irq = (long)data;
|
|
static unsigned i2c_errors;
|
|
static const unsigned max_i2c_errors = 100;
|
|
int ret;
|
|
|
|
current->flags |= PF_NOFREEZE;
|
|
|
|
while (!kthread_should_stop()) {
|
|
int i;
|
|
union {
|
|
u8 bytes[4];
|
|
u32 int_sts;
|
|
} sts;
|
|
|
|
/* Wait for IRQ, then read PIH irq status (also blocking) */
|
|
wait_for_completion_interruptible(&irq_event);
|
|
|
|
/* read INT_STS_A, B and C in one shot using a burst read */
|
|
ret = twl_i2c_read(TWL_MODULE_PIH, sts.bytes,
|
|
REG_INT_STS_A, 3);
|
|
if (ret) {
|
|
pr_warning("twl6030: I2C error %d reading PIH ISR\n",
|
|
ret);
|
|
if (++i2c_errors >= max_i2c_errors) {
|
|
printk(KERN_ERR "Maximum I2C error count"
|
|
" exceeded. Terminating %s.\n",
|
|
__func__);
|
|
break;
|
|
}
|
|
complete(&irq_event);
|
|
continue;
|
|
}
|
|
|
|
|
|
|
|
sts.bytes[3] = 0; /* Only 24 bits are valid*/
|
|
|
|
/*
|
|
* Since VBUS status bit is not reliable for VBUS disconnect
|
|
* use CHARGER VBUS detection status bit instead.
|
|
*/
|
|
if (sts.bytes[2] & 0x10)
|
|
sts.bytes[2] |= 0x08;
|
|
|
|
for (i = 0; sts.int_sts; sts.int_sts >>= 1, i++) {
|
|
local_irq_disable();
|
|
if (sts.int_sts & 0x1) {
|
|
int module_irq = twl6030_irq_base +
|
|
twl6030_interrupt_mapping[i];
|
|
struct irq_desc *d = irq_to_desc(module_irq);
|
|
|
|
if (!d) {
|
|
pr_err("twl6030: Invalid SIH IRQ: %d\n",
|
|
module_irq);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* These can't be masked ... always warn
|
|
* if we get any surprises.
|
|
*/
|
|
if (d->status & IRQ_DISABLED)
|
|
note_interrupt(module_irq, d,
|
|
IRQ_NONE);
|
|
else
|
|
d->handle_irq(module_irq, d);
|
|
|
|
}
|
|
local_irq_enable();
|
|
}
|
|
ret = twl_i2c_write(TWL_MODULE_PIH, sts.bytes,
|
|
REG_INT_STS_A, 3); /* clear INT_STS_A */
|
|
if (ret)
|
|
pr_warning("twl6030: I2C error in clearing PIH ISR\n");
|
|
|
|
enable_irq(irq);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* handle_twl6030_int() is the desc->handle method for the twl6030 interrupt.
|
|
* This is a chained interrupt, so there is no desc->action method for it.
|
|
* Now we need to query the interrupt controller in the twl6030 to determine
|
|
* which module is generating the interrupt request. However, we can't do i2c
|
|
* transactions in interrupt context, so we must defer that work to a kernel
|
|
* thread. All we do here is acknowledge and mask the interrupt and wakeup
|
|
* the kernel thread.
|
|
*/
|
|
static irqreturn_t handle_twl6030_pih(int irq, void *devid)
|
|
{
|
|
disable_irq_nosync(irq);
|
|
complete(devid);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------*/
|
|
|
|
static inline void activate_irq(int irq)
|
|
{
|
|
#ifdef CONFIG_ARM
|
|
/* ARM requires an extra step to clear IRQ_NOREQUEST, which it
|
|
* sets on behalf of every irq_chip. Also sets IRQ_NOPROBE.
|
|
*/
|
|
set_irq_flags(irq, IRQF_VALID);
|
|
#else
|
|
/* same effect on other architectures */
|
|
set_irq_noprobe(irq);
|
|
#endif
|
|
}
|
|
|
|
/*----------------------------------------------------------------------*/
|
|
|
|
static unsigned twl6030_irq_next;
|
|
|
|
/*----------------------------------------------------------------------*/
|
|
int twl6030_interrupt_unmask(u8 bit_mask, u8 offset)
|
|
{
|
|
int ret;
|
|
u8 unmask_value;
|
|
ret = twl_i2c_read_u8(TWL_MODULE_PIH, &unmask_value,
|
|
REG_INT_STS_A + offset);
|
|
unmask_value &= (~(bit_mask));
|
|
ret |= twl_i2c_write_u8(TWL_MODULE_PIH, unmask_value,
|
|
REG_INT_STS_A + offset); /* unmask INT_MSK_A/B/C */
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(twl6030_interrupt_unmask);
|
|
|
|
int twl6030_interrupt_mask(u8 bit_mask, u8 offset)
|
|
{
|
|
int ret;
|
|
u8 mask_value;
|
|
ret = twl_i2c_read_u8(TWL_MODULE_PIH, &mask_value,
|
|
REG_INT_STS_A + offset);
|
|
mask_value |= (bit_mask);
|
|
ret |= twl_i2c_write_u8(TWL_MODULE_PIH, mask_value,
|
|
REG_INT_STS_A + offset); /* mask INT_MSK_A/B/C */
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(twl6030_interrupt_mask);
|
|
|
|
int twl6030_mmc_card_detect_config(void)
|
|
{
|
|
int ret;
|
|
u8 reg_val = 0;
|
|
|
|
/* Unmasking the Card detect Interrupt line for MMC1 from Phoenix */
|
|
twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
|
|
REG_INT_MSK_LINE_B);
|
|
twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
|
|
REG_INT_MSK_STS_B);
|
|
/*
|
|
* Intially Configuring MMC_CTRL for receving interrupts &
|
|
* Card status on TWL6030 for MMC1
|
|
*/
|
|
ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, ®_val, TWL6030_MMCCTRL);
|
|
if (ret < 0) {
|
|
pr_err("twl6030: Failed to read MMCCTRL, error %d\n", ret);
|
|
return ret;
|
|
}
|
|
reg_val &= ~VMMC_AUTO_OFF;
|
|
reg_val |= SW_FC;
|
|
ret = twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val, TWL6030_MMCCTRL);
|
|
if (ret < 0) {
|
|
pr_err("twl6030: Failed to write MMCCTRL, error %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* Configuring PullUp-PullDown register */
|
|
ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, ®_val,
|
|
TWL6030_CFG_INPUT_PUPD3);
|
|
if (ret < 0) {
|
|
pr_err("twl6030: Failed to read CFG_INPUT_PUPD3, error %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
reg_val &= ~(MMC_PU | MMC_PD);
|
|
ret = twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val,
|
|
TWL6030_CFG_INPUT_PUPD3);
|
|
if (ret < 0) {
|
|
pr_err("twl6030: Failed to write CFG_INPUT_PUPD3, error %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(twl6030_mmc_card_detect_config);
|
|
|
|
int twl6030_mmc_card_detect(struct device *dev, int slot)
|
|
{
|
|
int ret = -EIO;
|
|
u8 read_reg = 0;
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
|
|
if (pdev->id) {
|
|
/* TWL6030 provide's Card detect support for
|
|
* only MMC1 controller.
|
|
*/
|
|
pr_err("Unkown MMC controller %d in %s\n", pdev->id, __func__);
|
|
return ret;
|
|
}
|
|
/*
|
|
* BIT0 of MMC_CTRL on TWL6030 provides card status for MMC1
|
|
* 0 - Card not present ,1 - Card present
|
|
*/
|
|
ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &read_reg,
|
|
TWL6030_MMCCTRL);
|
|
if (ret >= 0)
|
|
ret = read_reg & STS_MMC;
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(twl6030_mmc_card_detect);
|
|
|
|
int twl6030_init_irq(int irq_num, unsigned irq_base, unsigned irq_end)
|
|
{
|
|
|
|
int status = 0;
|
|
int i;
|
|
struct task_struct *task;
|
|
int ret;
|
|
u8 mask[4];
|
|
|
|
static struct irq_chip twl6030_irq_chip;
|
|
mask[1] = 0xFF;
|
|
mask[2] = 0xFF;
|
|
mask[3] = 0xFF;
|
|
ret = twl_i2c_write(TWL_MODULE_PIH, &mask[0],
|
|
REG_INT_MSK_LINE_A, 3); /* MASK ALL INT LINES */
|
|
ret = twl_i2c_write(TWL_MODULE_PIH, &mask[0],
|
|
REG_INT_MSK_STS_A, 3); /* MASK ALL INT STS */
|
|
ret = twl_i2c_write(TWL_MODULE_PIH, &mask[0],
|
|
REG_INT_STS_A, 3); /* clear INT_STS_A,B,C */
|
|
|
|
twl6030_irq_base = irq_base;
|
|
|
|
/* install an irq handler for each of the modules;
|
|
* clone dummy irq_chip since PIH can't *do* anything
|
|
*/
|
|
twl6030_irq_chip = dummy_irq_chip;
|
|
twl6030_irq_chip.name = "twl6030";
|
|
twl6030_irq_chip.set_type = NULL;
|
|
|
|
for (i = irq_base; i < irq_end; i++) {
|
|
set_irq_chip_and_handler(i, &twl6030_irq_chip,
|
|
handle_simple_irq);
|
|
activate_irq(i);
|
|
}
|
|
|
|
twl6030_irq_next = i;
|
|
pr_info("twl6030: %s (irq %d) chaining IRQs %d..%d\n", "PIH",
|
|
irq_num, irq_base, twl6030_irq_next - 1);
|
|
|
|
/* install an irq handler to demultiplex the TWL6030 interrupt */
|
|
init_completion(&irq_event);
|
|
task = kthread_run(twl6030_irq_thread, (void *)irq_num, "twl6030-irq");
|
|
if (IS_ERR(task)) {
|
|
pr_err("twl6030: could not create irq %d thread!\n", irq_num);
|
|
status = PTR_ERR(task);
|
|
goto fail_kthread;
|
|
}
|
|
|
|
status = request_irq(irq_num, handle_twl6030_pih, IRQF_DISABLED,
|
|
"TWL6030-PIH", &irq_event);
|
|
if (status < 0) {
|
|
pr_err("twl6030: could not claim irq%d: %d\n", irq_num, status);
|
|
goto fail_irq;
|
|
}
|
|
return status;
|
|
fail_irq:
|
|
free_irq(irq_num, &irq_event);
|
|
|
|
fail_kthread:
|
|
for (i = irq_base; i < irq_end; i++)
|
|
set_irq_chip_and_handler(i, NULL, NULL);
|
|
return status;
|
|
}
|
|
|
|
int twl6030_exit_irq(void)
|
|
{
|
|
|
|
if (twl6030_irq_base) {
|
|
pr_err("twl6030: can't yet clean up IRQs?\n");
|
|
return -ENOSYS;
|
|
}
|
|
return 0;
|
|
}
|
|
|