linux/drivers/mfd/jz4740-adc.c
Mark Brown 55692af5eb mfd: core: Push irqdomain mapping out into devices
Currently the MFD core supports remapping MFD cell interrupts using an
irqdomain but only if the MFD is being instantiated using device tree
and only if the device tree bindings use the pattern of registering IPs
in the device tree with compatible properties.  This will be actively
harmful for drivers which support non-DT platforms and use this pattern
for their DT bindings as it will mean that the core will silently change
remapping behaviour and it is also limiting for drivers which don't do
DT with this particular pattern.  There is also a potential fragility if
there are interrupts not associated with MFD cells and all the cells are
omitted from the device tree for some reason.

Instead change the code to take an IRQ domain as an optional argument,
allowing drivers to take the decision about the parent domain for their
interrupts.  The one current user of this feature is ab8500-core, it has
the domain lookup pushed out into the driver.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-09-14 09:51:54 +02:00

348 lines
7.9 KiB
C

/*
* Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
* JZ4740 SoC ADC driver
*
* 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.
*
* 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.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
* This driver synchronizes access to the JZ4740 ADC core between the
* JZ4740 battery and hwmon drivers.
*/
#include <linux/err.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/clk.h>
#include <linux/mfd/core.h>
#include <linux/jz4740-adc.h>
#define JZ_REG_ADC_ENABLE 0x00
#define JZ_REG_ADC_CFG 0x04
#define JZ_REG_ADC_CTRL 0x08
#define JZ_REG_ADC_STATUS 0x0c
#define JZ_REG_ADC_TOUCHSCREEN_BASE 0x10
#define JZ_REG_ADC_BATTERY_BASE 0x1c
#define JZ_REG_ADC_HWMON_BASE 0x20
#define JZ_ADC_ENABLE_TOUCH BIT(2)
#define JZ_ADC_ENABLE_BATTERY BIT(1)
#define JZ_ADC_ENABLE_ADCIN BIT(0)
enum {
JZ_ADC_IRQ_ADCIN = 0,
JZ_ADC_IRQ_BATTERY,
JZ_ADC_IRQ_TOUCH,
JZ_ADC_IRQ_PENUP,
JZ_ADC_IRQ_PENDOWN,
};
struct jz4740_adc {
struct resource *mem;
void __iomem *base;
int irq;
struct irq_chip_generic *gc;
struct clk *clk;
atomic_t clk_ref;
spinlock_t lock;
};
static void jz4740_adc_irq_demux(unsigned int irq, struct irq_desc *desc)
{
struct irq_chip_generic *gc = irq_desc_get_handler_data(desc);
uint8_t status;
unsigned int i;
status = readb(gc->reg_base + JZ_REG_ADC_STATUS);
for (i = 0; i < 5; ++i) {
if (status & BIT(i))
generic_handle_irq(gc->irq_base + i);
}
}
/* Refcounting for the ADC clock is done in here instead of in the clock
* framework, because it is the only clock which is shared between multiple
* devices and thus is the only clock which needs refcounting */
static inline void jz4740_adc_clk_enable(struct jz4740_adc *adc)
{
if (atomic_inc_return(&adc->clk_ref) == 1)
clk_enable(adc->clk);
}
static inline void jz4740_adc_clk_disable(struct jz4740_adc *adc)
{
if (atomic_dec_return(&adc->clk_ref) == 0)
clk_disable(adc->clk);
}
static inline void jz4740_adc_set_enabled(struct jz4740_adc *adc, int engine,
bool enabled)
{
unsigned long flags;
uint8_t val;
spin_lock_irqsave(&adc->lock, flags);
val = readb(adc->base + JZ_REG_ADC_ENABLE);
if (enabled)
val |= BIT(engine);
else
val &= ~BIT(engine);
writeb(val, adc->base + JZ_REG_ADC_ENABLE);
spin_unlock_irqrestore(&adc->lock, flags);
}
static int jz4740_adc_cell_enable(struct platform_device *pdev)
{
struct jz4740_adc *adc = dev_get_drvdata(pdev->dev.parent);
jz4740_adc_clk_enable(adc);
jz4740_adc_set_enabled(adc, pdev->id, true);
return 0;
}
static int jz4740_adc_cell_disable(struct platform_device *pdev)
{
struct jz4740_adc *adc = dev_get_drvdata(pdev->dev.parent);
jz4740_adc_set_enabled(adc, pdev->id, false);
jz4740_adc_clk_disable(adc);
return 0;
}
int jz4740_adc_set_config(struct device *dev, uint32_t mask, uint32_t val)
{
struct jz4740_adc *adc = dev_get_drvdata(dev);
unsigned long flags;
uint32_t cfg;
if (!adc)
return -ENODEV;
spin_lock_irqsave(&adc->lock, flags);
cfg = readl(adc->base + JZ_REG_ADC_CFG);
cfg &= ~mask;
cfg |= val;
writel(cfg, adc->base + JZ_REG_ADC_CFG);
spin_unlock_irqrestore(&adc->lock, flags);
return 0;
}
EXPORT_SYMBOL_GPL(jz4740_adc_set_config);
static struct resource jz4740_hwmon_resources[] = {
{
.start = JZ_ADC_IRQ_ADCIN,
.flags = IORESOURCE_IRQ,
},
{
.start = JZ_REG_ADC_HWMON_BASE,
.end = JZ_REG_ADC_HWMON_BASE + 3,
.flags = IORESOURCE_MEM,
},
};
static struct resource jz4740_battery_resources[] = {
{
.start = JZ_ADC_IRQ_BATTERY,
.flags = IORESOURCE_IRQ,
},
{
.start = JZ_REG_ADC_BATTERY_BASE,
.end = JZ_REG_ADC_BATTERY_BASE + 3,
.flags = IORESOURCE_MEM,
},
};
static struct mfd_cell jz4740_adc_cells[] = {
{
.id = 0,
.name = "jz4740-hwmon",
.num_resources = ARRAY_SIZE(jz4740_hwmon_resources),
.resources = jz4740_hwmon_resources,
.enable = jz4740_adc_cell_enable,
.disable = jz4740_adc_cell_disable,
},
{
.id = 1,
.name = "jz4740-battery",
.num_resources = ARRAY_SIZE(jz4740_battery_resources),
.resources = jz4740_battery_resources,
.enable = jz4740_adc_cell_enable,
.disable = jz4740_adc_cell_disable,
},
};
static int __devinit jz4740_adc_probe(struct platform_device *pdev)
{
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
struct jz4740_adc *adc;
struct resource *mem_base;
int ret;
int irq_base;
adc = kmalloc(sizeof(*adc), GFP_KERNEL);
if (!adc) {
dev_err(&pdev->dev, "Failed to allocate driver structure\n");
return -ENOMEM;
}
adc->irq = platform_get_irq(pdev, 0);
if (adc->irq < 0) {
ret = adc->irq;
dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
goto err_free;
}
irq_base = platform_get_irq(pdev, 1);
if (irq_base < 0) {
ret = irq_base;
dev_err(&pdev->dev, "Failed to get irq base: %d\n", ret);
goto err_free;
}
mem_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem_base) {
ret = -ENOENT;
dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
goto err_free;
}
/* Only request the shared registers for the MFD driver */
adc->mem = request_mem_region(mem_base->start, JZ_REG_ADC_STATUS,
pdev->name);
if (!adc->mem) {
ret = -EBUSY;
dev_err(&pdev->dev, "Failed to request mmio memory region\n");
goto err_free;
}
adc->base = ioremap_nocache(adc->mem->start, resource_size(adc->mem));
if (!adc->base) {
ret = -EBUSY;
dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
goto err_release_mem_region;
}
adc->clk = clk_get(&pdev->dev, "adc");
if (IS_ERR(adc->clk)) {
ret = PTR_ERR(adc->clk);
dev_err(&pdev->dev, "Failed to get clock: %d\n", ret);
goto err_iounmap;
}
spin_lock_init(&adc->lock);
atomic_set(&adc->clk_ref, 0);
platform_set_drvdata(pdev, adc);
gc = irq_alloc_generic_chip("INTC", 1, irq_base, adc->base,
handle_level_irq);
ct = gc->chip_types;
ct->regs.mask = JZ_REG_ADC_CTRL;
ct->regs.ack = JZ_REG_ADC_STATUS;
ct->chip.irq_mask = irq_gc_mask_set_bit;
ct->chip.irq_unmask = irq_gc_mask_clr_bit;
ct->chip.irq_ack = irq_gc_ack_set_bit;
irq_setup_generic_chip(gc, IRQ_MSK(5), 0, 0, IRQ_NOPROBE | IRQ_LEVEL);
adc->gc = gc;
irq_set_handler_data(adc->irq, gc);
irq_set_chained_handler(adc->irq, jz4740_adc_irq_demux);
writeb(0x00, adc->base + JZ_REG_ADC_ENABLE);
writeb(0xff, adc->base + JZ_REG_ADC_CTRL);
ret = mfd_add_devices(&pdev->dev, 0, jz4740_adc_cells,
ARRAY_SIZE(jz4740_adc_cells), mem_base,
irq_base, NULL);
if (ret < 0)
goto err_clk_put;
return 0;
err_clk_put:
clk_put(adc->clk);
err_iounmap:
platform_set_drvdata(pdev, NULL);
iounmap(adc->base);
err_release_mem_region:
release_mem_region(adc->mem->start, resource_size(adc->mem));
err_free:
kfree(adc);
return ret;
}
static int __devexit jz4740_adc_remove(struct platform_device *pdev)
{
struct jz4740_adc *adc = platform_get_drvdata(pdev);
mfd_remove_devices(&pdev->dev);
irq_remove_generic_chip(adc->gc, IRQ_MSK(5), IRQ_NOPROBE | IRQ_LEVEL, 0);
kfree(adc->gc);
irq_set_handler_data(adc->irq, NULL);
irq_set_chained_handler(adc->irq, NULL);
iounmap(adc->base);
release_mem_region(adc->mem->start, resource_size(adc->mem));
clk_put(adc->clk);
platform_set_drvdata(pdev, NULL);
kfree(adc);
return 0;
}
static struct platform_driver jz4740_adc_driver = {
.probe = jz4740_adc_probe,
.remove = __devexit_p(jz4740_adc_remove),
.driver = {
.name = "jz4740-adc",
.owner = THIS_MODULE,
},
};
module_platform_driver(jz4740_adc_driver);
MODULE_DESCRIPTION("JZ4740 SoC ADC driver");
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:jz4740-adc");