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linux/drivers/mfd/twl6030-irq.c

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/*
* 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/export.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kthread.h>
#include <linux/i2c/twl.h>
#include <linux/platform_device.h>
#include <linux/suspend.h>
#include <linux/of.h>
#include <linux/irqdomain.h>
#include <linux/of_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.
*/
#define TWL6030_NR_IRQS 20
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 */
CHARGERFAULT_INTR_OFFSET, /* Bit 21 EXT_CHRG */
CHARGERFAULT_INTR_OFFSET, /* Bit 22 INT_CHRG */
RSV_INTR_OFFSET, /* Bit 23 Reserved */
};
static int twl6032_interrupt_mapping[24] = {
PWR_INTR_OFFSET, /* Bit 0 PWRON */
PWR_INTR_OFFSET, /* Bit 1 RPWRON */
PWR_INTR_OFFSET, /* Bit 2 SYS_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 */
PWR_INTR_OFFSET, /* Bit 7 SPDURATION */
PWR_INTR_OFFSET, /* Bit 8 WATCHDOG */
BATDETECT_INTR_OFFSET, /* Bit 9 BAT */
SIMDETECT_INTR_OFFSET, /* Bit 10 SIM */
MMCDETECT_INTR_OFFSET, /* Bit 11 MMC */
MADC_INTR_OFFSET, /* Bit 12 GPADC_RT_EOC */
MADC_INTR_OFFSET, /* Bit 13 GPADC_SW_EOC */
GASGAUGE_INTR_OFFSET, /* Bit 14 CC_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 */
CHARGERFAULT_INTR_OFFSET, /* Bit 21 EXT_CHRG */
CHARGERFAULT_INTR_OFFSET, /* Bit 22 INT_CHRG */
RSV_INTR_OFFSET, /* Bit 23 Reserved */
};
/*----------------------------------------------------------------------*/
struct twl6030_irq {
unsigned int irq_base;
int twl_irq;
bool irq_wake_enabled;
atomic_t wakeirqs;
struct notifier_block pm_nb;
struct irq_chip irq_chip;
struct irq_domain *irq_domain;
const int *irq_mapping_tbl;
};
static struct twl6030_irq *twl6030_irq;
static int twl6030_irq_pm_notifier(struct notifier_block *notifier,
unsigned long pm_event, void *unused)
{
int chained_wakeups;
struct twl6030_irq *pdata = container_of(notifier, struct twl6030_irq,
pm_nb);
switch (pm_event) {
case PM_SUSPEND_PREPARE:
chained_wakeups = atomic_read(&pdata->wakeirqs);
if (chained_wakeups && !pdata->irq_wake_enabled) {
if (enable_irq_wake(pdata->twl_irq))
pr_err("twl6030 IRQ wake enable failed\n");
else
pdata->irq_wake_enabled = true;
} else if (!chained_wakeups && pdata->irq_wake_enabled) {
disable_irq_wake(pdata->twl_irq);
pdata->irq_wake_enabled = false;
}
disable_irq(pdata->twl_irq);
break;
case PM_POST_SUSPEND:
enable_irq(pdata->twl_irq);
break;
default:
break;
}
return NOTIFY_DONE;
}
/*
* Threaded irq handler for the twl6030 interrupt.
* We query the interrupt controller in the twl6030 to determine
* which module is generating the interrupt request and call
* handle_nested_irq for that module.
*/
static irqreturn_t twl6030_irq_thread(int irq, void *data)
{
int i, ret;
union {
u8 bytes[4];
__le32 int_sts;
} sts;
u32 int_sts; /* sts.int_sts converted to CPU endianness */
struct twl6030_irq *pdata = data;
/* 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_warn("twl6030_irq: I2C error %d reading PIH ISR\n", ret);
return IRQ_HANDLED;
}
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;
int_sts = le32_to_cpu(sts.int_sts);
for (i = 0; int_sts; int_sts >>= 1, i++)
if (int_sts & 0x1) {
int module_irq =
irq_find_mapping(pdata->irq_domain,
pdata->irq_mapping_tbl[i]);
if (module_irq)
handle_nested_irq(module_irq);
else
pr_err("twl6030_irq: Unmapped PIH ISR %u detected\n",
i);
pr_debug("twl6030_irq: PIH ISR %u, virq%u\n",
i, module_irq);
}
/*
* NOTE:
* Simulation confirms that documentation is wrong w.r.t the
* interrupt status clear operation. A single *byte* write to
* any one of STS_A to STS_C register results in all three
* STS registers being reset. Since it does not matter which
* value is written, all three registers are cleared on a
* single byte write, so we just use 0x0 to clear.
*/
ret = twl_i2c_write_u8(TWL_MODULE_PIH, 0x00, REG_INT_STS_A);
if (ret)
pr_warn("twl6030_irq: I2C error in clearing PIH ISR\n");
return IRQ_HANDLED;
}
/*----------------------------------------------------------------------*/
static int twl6030_irq_set_wake(struct irq_data *d, unsigned int on)
{
struct twl6030_irq *pdata = irq_get_chip_data(d->irq);
if (on)
atomic_inc(&pdata->wakeirqs);
else
atomic_dec(&pdata->wakeirqs);
return 0;
}
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);
/*
* Initially Configuring MMC_CTRL for receiving interrupts &
* Card status on TWL6030 for MMC1
*/
ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &reg_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, &reg_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 irq_find_mapping(twl6030_irq->irq_domain,
MMCDETECT_INTR_OFFSET);
}
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("Unknown 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);
static int twl6030_irq_map(struct irq_domain *d, unsigned int virq,
irq_hw_number_t hwirq)
{
struct twl6030_irq *pdata = d->host_data;
irq_set_chip_data(virq, pdata);
irq_set_chip_and_handler(virq, &pdata->irq_chip, handle_simple_irq);
irq_set_nested_thread(virq, true);
irq_set_parent(virq, pdata->twl_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(virq, IRQF_VALID);
#else
/* same effect on other architectures */
irq_set_noprobe(virq);
#endif
return 0;
}
static void twl6030_irq_unmap(struct irq_domain *d, unsigned int virq)
{
#ifdef CONFIG_ARM
set_irq_flags(virq, 0);
#endif
irq_set_chip_and_handler(virq, NULL, NULL);
irq_set_chip_data(virq, NULL);
}
static struct irq_domain_ops twl6030_irq_domain_ops = {
.map = twl6030_irq_map,
.unmap = twl6030_irq_unmap,
.xlate = irq_domain_xlate_onetwocell,
};
static const struct of_device_id twl6030_of_match[] = {
{.compatible = "ti,twl6030", &twl6030_interrupt_mapping},
{.compatible = "ti,twl6032", &twl6032_interrupt_mapping},
{ },
};
int twl6030_init_irq(struct device *dev, int irq_num)
{
struct device_node *node = dev->of_node;
int nr_irqs;
int status;
u8 mask[3];
const struct of_device_id *of_id;
of_id = of_match_device(twl6030_of_match, dev);
if (!of_id || !of_id->data) {
dev_err(dev, "Unknown TWL device model\n");
return -EINVAL;
}
nr_irqs = TWL6030_NR_IRQS;
twl6030_irq = devm_kzalloc(dev, sizeof(*twl6030_irq), GFP_KERNEL);
if (!twl6030_irq) {
dev_err(dev, "twl6030_irq: Memory allocation failed\n");
return -ENOMEM;
}
mask[0] = 0xFF;
mask[1] = 0xFF;
mask[2] = 0xFF;
/* mask all int lines */
status = twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_LINE_A, 3);
/* mask all int sts */
status |= twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_STS_A, 3);
/* clear INT_STS_A,B,C */
status |= twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_STS_A, 3);
if (status < 0) {
dev_err(dev, "I2C err writing TWL_MODULE_PIH: %d\n", status);
return status;
}
/*
* install an irq handler for each of the modules;
* clone dummy irq_chip since PIH can't *do* anything
*/
twl6030_irq->irq_chip = dummy_irq_chip;
twl6030_irq->irq_chip.name = "twl6030";
twl6030_irq->irq_chip.irq_set_type = NULL;
twl6030_irq->irq_chip.irq_set_wake = twl6030_irq_set_wake;
twl6030_irq->pm_nb.notifier_call = twl6030_irq_pm_notifier;
atomic_set(&twl6030_irq->wakeirqs, 0);
twl6030_irq->irq_mapping_tbl = of_id->data;
twl6030_irq->irq_domain =
irq_domain_add_linear(node, nr_irqs,
&twl6030_irq_domain_ops, twl6030_irq);
if (!twl6030_irq->irq_domain) {
dev_err(dev, "Can't add irq_domain\n");
return -ENOMEM;
}
dev_info(dev, "PIH (irq %d) nested IRQs\n", irq_num);
/* install an irq handler to demultiplex the TWL6030 interrupt */
status = request_threaded_irq(irq_num, NULL, twl6030_irq_thread,
IRQF_ONESHOT, "TWL6030-PIH", twl6030_irq);
if (status < 0) {
dev_err(dev, "could not claim irq %d: %d\n", irq_num, status);
goto fail_irq;
}
twl6030_irq->twl_irq = irq_num;
register_pm_notifier(&twl6030_irq->pm_nb);
return 0;
fail_irq:
irq_domain_remove(twl6030_irq->irq_domain);
return status;
}
int twl6030_exit_irq(void)
{
if (twl6030_irq && twl6030_irq->twl_irq) {
unregister_pm_notifier(&twl6030_irq->pm_nb);
free_irq(twl6030_irq->twl_irq, NULL);
/*
* TODO: IRQ domain and allocated nested IRQ descriptors
* should be freed somehow here. Now It can't be done, because
* child devices will not be deleted during removing of
* TWL Core driver and they will still contain allocated
* virt IRQs in their Resources tables.
* The same prevents us from using devm_request_threaded_irq()
* in this module.
*/
}
return 0;
}
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