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linux/drivers/gpio/gpio-msc313.c
Daniel Palmer 93224edf0b gpio: msc313: MStar MSC313 GPIO driver 
This adds a driver that supports the GPIO block found in
MStar/SigmaStar ARMv7 SoCs.

The controller seems to have enough register for 128 lines
but where they are wired up differs between chips and
no currently known chip uses anywhere near 128 lines so there
needs to be some per-chip data to collect together what lines
actually have physical pins attached and map the right names to them.

The core peripherals seem to use the same lines on the
currently known chips but the lines used for the sensor
interface, lcd controller etc pins seem to be totally
different between the infinity and mercury chips

The code tries to collect all of the re-usable names,
offsets etc together so that it's easy to build the extra
per-chip data for other chips in the future.

So far this only supports the MSC313 and MSC313E chips.

Support for the SSC8336N (mercury5) is trivial to add once
all of the lines have been mapped out.

Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Link: https://lore.kernel.org/r/20201129110803.2461700-4-daniel@0x0f.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-12-05 22:41:22 +01:00

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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2020 Daniel Palmer<daniel@thingy.jp> */
#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/gpio/driver.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <dt-bindings/gpio/msc313-gpio.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
#define DRIVER_NAME "gpio-msc313"
#define MSC313_GPIO_IN BIT(0)
#define MSC313_GPIO_OUT BIT(4)
#define MSC313_GPIO_OEN BIT(5)
/*
* These bits need to be saved to correctly restore the
* gpio state when resuming from suspend to memory.
*/
#define MSC313_GPIO_BITSTOSAVE (MSC313_GPIO_OUT | MSC313_GPIO_OEN)
/* pad names for fuart, same for all SoCs so far */
#define MSC313_PINNAME_FUART_RX "fuart_rx"
#define MSC313_PINNAME_FUART_TX "fuart_tx"
#define MSC313_PINNAME_FUART_CTS "fuart_cts"
#define MSC313_PINNAME_FUART_RTS "fuart_rts"
/* pad names for sr, mercury5 is different */
#define MSC313_PINNAME_SR_IO2 "sr_io2"
#define MSC313_PINNAME_SR_IO3 "sr_io3"
#define MSC313_PINNAME_SR_IO4 "sr_io4"
#define MSC313_PINNAME_SR_IO5 "sr_io5"
#define MSC313_PINNAME_SR_IO6 "sr_io6"
#define MSC313_PINNAME_SR_IO7 "sr_io7"
#define MSC313_PINNAME_SR_IO8 "sr_io8"
#define MSC313_PINNAME_SR_IO9 "sr_io9"
#define MSC313_PINNAME_SR_IO10 "sr_io10"
#define MSC313_PINNAME_SR_IO11 "sr_io11"
#define MSC313_PINNAME_SR_IO12 "sr_io12"
#define MSC313_PINNAME_SR_IO13 "sr_io13"
#define MSC313_PINNAME_SR_IO14 "sr_io14"
#define MSC313_PINNAME_SR_IO15 "sr_io15"
#define MSC313_PINNAME_SR_IO16 "sr_io16"
#define MSC313_PINNAME_SR_IO17 "sr_io17"
/* pad names for sd, same for all SoCs so far */
#define MSC313_PINNAME_SD_CLK "sd_clk"
#define MSC313_PINNAME_SD_CMD "sd_cmd"
#define MSC313_PINNAME_SD_D0 "sd_d0"
#define MSC313_PINNAME_SD_D1 "sd_d1"
#define MSC313_PINNAME_SD_D2 "sd_d2"
#define MSC313_PINNAME_SD_D3 "sd_d3"
/* pad names for i2c1, same for all SoCs so for */
#define MSC313_PINNAME_I2C1_SCL "i2c1_scl"
#define MSC313_PINNAME_I2C1_SCA "i2c1_sda"
/* pad names for spi0, same for all SoCs so far */
#define MSC313_PINNAME_SPI0_CZ "spi0_cz"
#define MSC313_PINNAME_SPI0_CK "spi0_ck"
#define MSC313_PINNAME_SPI0_DI "spi0_di"
#define MSC313_PINNAME_SPI0_DO "spi0_do"
#define FUART_NAMES \
MSC313_PINNAME_FUART_RX, \
MSC313_PINNAME_FUART_TX, \
MSC313_PINNAME_FUART_CTS, \
MSC313_PINNAME_FUART_RTS
#define OFF_FUART_RX 0x50
#define OFF_FUART_TX 0x54
#define OFF_FUART_CTS 0x58
#define OFF_FUART_RTS 0x5c
#define FUART_OFFSETS \
OFF_FUART_RX, \
OFF_FUART_TX, \
OFF_FUART_CTS, \
OFF_FUART_RTS
#define SR_NAMES \
MSC313_PINNAME_SR_IO2, \
MSC313_PINNAME_SR_IO3, \
MSC313_PINNAME_SR_IO4, \
MSC313_PINNAME_SR_IO5, \
MSC313_PINNAME_SR_IO6, \
MSC313_PINNAME_SR_IO7, \
MSC313_PINNAME_SR_IO8, \
MSC313_PINNAME_SR_IO9, \
MSC313_PINNAME_SR_IO10, \
MSC313_PINNAME_SR_IO11, \
MSC313_PINNAME_SR_IO12, \
MSC313_PINNAME_SR_IO13, \
MSC313_PINNAME_SR_IO14, \
MSC313_PINNAME_SR_IO15, \
MSC313_PINNAME_SR_IO16, \
MSC313_PINNAME_SR_IO17
#define OFF_SR_IO2 0x88
#define OFF_SR_IO3 0x8c
#define OFF_SR_IO4 0x90
#define OFF_SR_IO5 0x94
#define OFF_SR_IO6 0x98
#define OFF_SR_IO7 0x9c
#define OFF_SR_IO8 0xa0
#define OFF_SR_IO9 0xa4
#define OFF_SR_IO10 0xa8
#define OFF_SR_IO11 0xac
#define OFF_SR_IO12 0xb0
#define OFF_SR_IO13 0xb4
#define OFF_SR_IO14 0xb8
#define OFF_SR_IO15 0xbc
#define OFF_SR_IO16 0xc0
#define OFF_SR_IO17 0xc4
#define SR_OFFSETS \
OFF_SR_IO2, \
OFF_SR_IO3, \
OFF_SR_IO4, \
OFF_SR_IO5, \
OFF_SR_IO6, \
OFF_SR_IO7, \
OFF_SR_IO8, \
OFF_SR_IO9, \
OFF_SR_IO10, \
OFF_SR_IO11, \
OFF_SR_IO12, \
OFF_SR_IO13, \
OFF_SR_IO14, \
OFF_SR_IO15, \
OFF_SR_IO16, \
OFF_SR_IO17
#define SD_NAMES \
MSC313_PINNAME_SD_CLK, \
MSC313_PINNAME_SD_CMD, \
MSC313_PINNAME_SD_D0, \
MSC313_PINNAME_SD_D1, \
MSC313_PINNAME_SD_D2, \
MSC313_PINNAME_SD_D3
#define OFF_SD_CLK 0x140
#define OFF_SD_CMD 0x144
#define OFF_SD_D0 0x148
#define OFF_SD_D1 0x14c
#define OFF_SD_D2 0x150
#define OFF_SD_D3 0x154
#define SD_OFFSETS \
OFF_SD_CLK, \
OFF_SD_CMD, \
OFF_SD_D0, \
OFF_SD_D1, \
OFF_SD_D2, \
OFF_SD_D3
#define I2C1_NAMES \
MSC313_PINNAME_I2C1_SCL, \
MSC313_PINNAME_I2C1_SCA
#define OFF_I2C1_SCL 0x188
#define OFF_I2C1_SCA 0x18c
#define I2C1_OFFSETS \
OFF_I2C1_SCL, \
OFF_I2C1_SCA
#define SPI0_NAMES \
MSC313_PINNAME_SPI0_CZ, \
MSC313_PINNAME_SPI0_CK, \
MSC313_PINNAME_SPI0_DI, \
MSC313_PINNAME_SPI0_DO
#define OFF_SPI0_CZ 0x1c0
#define OFF_SPI0_CK 0x1c4
#define OFF_SPI0_DI 0x1c8
#define OFF_SPI0_DO 0x1cc
#define SPI0_OFFSETS \
OFF_SPI0_CZ, \
OFF_SPI0_CK, \
OFF_SPI0_DI, \
OFF_SPI0_DO
struct msc313_gpio_data {
const char * const *names;
const unsigned int *offsets;
const unsigned int num;
};
#define MSC313_GPIO_CHIPDATA(_chip) \
static const struct msc313_gpio_data _chip##_data = { \
.names = _chip##_names, \
.offsets = _chip##_offsets, \
.num = ARRAY_SIZE(_chip##_offsets), \
}
#ifdef CONFIG_MACH_INFINITY
static const char * const msc313_names[] = {
FUART_NAMES,
SR_NAMES,
SD_NAMES,
I2C1_NAMES,
SPI0_NAMES,
};
static const unsigned int msc313_offsets[] = {
FUART_OFFSETS,
SR_OFFSETS,
SD_OFFSETS,
I2C1_OFFSETS,
SPI0_OFFSETS,
};
MSC313_GPIO_CHIPDATA(msc313);
#endif
struct msc313_gpio {
void __iomem *base;
const struct msc313_gpio_data *gpio_data;
u8 *saved;
};
static void msc313_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
{
struct msc313_gpio *gpio = gpiochip_get_data(chip);
u8 gpioreg = readb_relaxed(gpio->base + gpio->gpio_data->offsets[offset]);
if (value)
gpioreg |= MSC313_GPIO_OUT;
else
gpioreg &= ~MSC313_GPIO_OUT;
writeb_relaxed(gpioreg, gpio->base + gpio->gpio_data->offsets[offset]);
}
static int msc313_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
struct msc313_gpio *gpio = gpiochip_get_data(chip);
return readb_relaxed(gpio->base + gpio->gpio_data->offsets[offset]) & MSC313_GPIO_IN;
}
static int msc313_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
{
struct msc313_gpio *gpio = gpiochip_get_data(chip);
u8 gpioreg = readb_relaxed(gpio->base + gpio->gpio_data->offsets[offset]);
gpioreg |= MSC313_GPIO_OEN;
writeb_relaxed(gpioreg, gpio->base + gpio->gpio_data->offsets[offset]);
return 0;
}
static int msc313_gpio_direction_output(struct gpio_chip *chip, unsigned int offset, int value)
{
struct msc313_gpio *gpio = gpiochip_get_data(chip);
u8 gpioreg = readb_relaxed(gpio->base + gpio->gpio_data->offsets[offset]);
gpioreg &= ~MSC313_GPIO_OEN;
if (value)
gpioreg |= MSC313_GPIO_OUT;
else
gpioreg &= ~MSC313_GPIO_OUT;
writeb_relaxed(gpioreg, gpio->base + gpio->gpio_data->offsets[offset]);
return 0;
}
/*
* The interrupt handling happens in the parent interrupt controller,
* we don't do anything here.
*/
static struct irq_chip msc313_gpio_irqchip = {
.name = "GPIO",
.irq_eoi = irq_chip_eoi_parent,
.irq_mask = irq_chip_mask_parent,
.irq_unmask = irq_chip_unmask_parent,
.irq_set_type = irq_chip_set_type_parent,
.irq_set_affinity = irq_chip_set_affinity_parent,
};
/*
* The parent interrupt controller needs the GIC interrupt type set to GIC_SPI
* so we need to provide the fwspec. Essentially gpiochip_populate_parent_fwspec_twocell
* that puts GIC_SPI into the first cell.
*/
static void *msc313_gpio_populate_parent_fwspec(struct gpio_chip *gc,
unsigned int parent_hwirq,
unsigned int parent_type)
{
struct irq_fwspec *fwspec;
fwspec = kmalloc(sizeof(*fwspec), GFP_KERNEL);
if (!fwspec)
return NULL;
fwspec->fwnode = gc->irq.parent_domain->fwnode;
fwspec->param_count = 3;
fwspec->param[0] = GIC_SPI;
fwspec->param[1] = parent_hwirq;
fwspec->param[2] = parent_type;
return fwspec;
}
static int msc313e_gpio_child_to_parent_hwirq(struct gpio_chip *chip,
unsigned int child,
unsigned int child_type,
unsigned int *parent,
unsigned int *parent_type)
{
struct msc313_gpio *priv = gpiochip_get_data(chip);
unsigned int offset = priv->gpio_data->offsets[child];
/*
* only the spi0 pins have interrupts on the parent
* on all of the known chips and so far they are all
* mapped to the same place
*/
if (offset >= OFF_SPI0_CZ && offset <= OFF_SPI0_DO) {
*parent_type = child_type;
*parent = ((offset - OFF_SPI0_CZ) >> 2) + 28;
return 0;
}
return -EINVAL;
}
static int msc313_gpio_probe(struct platform_device *pdev)
{
const struct msc313_gpio_data *match_data;
struct msc313_gpio *gpio;
struct gpio_chip *gpiochip;
struct gpio_irq_chip *gpioirqchip;
struct irq_domain *parent_domain;
struct device_node *parent_node;
struct device *dev = &pdev->dev;
int ret;
match_data = of_device_get_match_data(dev);
if (!match_data)
return -EINVAL;
parent_node = of_irq_find_parent(dev->of_node);
if (!parent_node)
return -ENODEV;
parent_domain = irq_find_host(parent_node);
if (!parent_domain)
return -ENODEV;
gpio = devm_kzalloc(dev, sizeof(*gpio), GFP_KERNEL);
if (!gpio)
return -ENOMEM;
gpio->gpio_data = match_data;
gpio->saved = devm_kcalloc(dev, gpio->gpio_data->num, sizeof(*gpio->saved), GFP_KERNEL);
if (!gpio->saved)
return -ENOMEM;
gpio->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(gpio->base))
return PTR_ERR(gpio->base);
platform_set_drvdata(pdev, gpio);
gpiochip = devm_kzalloc(dev, sizeof(*gpiochip), GFP_KERNEL);
if (!gpiochip)
return -ENOMEM;
gpiochip->label = DRIVER_NAME;
gpiochip->parent = dev;
gpiochip->request = gpiochip_generic_request;
gpiochip->free = gpiochip_generic_free;
gpiochip->direction_input = msc313_gpio_direction_input;
gpiochip->direction_output = msc313_gpio_direction_output;
gpiochip->get = msc313_gpio_get;
gpiochip->set = msc313_gpio_set;
gpiochip->base = -1;
gpiochip->ngpio = gpio->gpio_data->num;
gpiochip->names = gpio->gpio_data->names;
gpioirqchip = &gpiochip->irq;
gpioirqchip->chip = &msc313_gpio_irqchip;
gpioirqchip->fwnode = of_node_to_fwnode(dev->of_node);
gpioirqchip->parent_domain = parent_domain;
gpioirqchip->child_to_parent_hwirq = msc313e_gpio_child_to_parent_hwirq;
gpioirqchip->populate_parent_alloc_arg = msc313_gpio_populate_parent_fwspec;
gpioirqchip->handler = handle_bad_irq;
gpioirqchip->default_type = IRQ_TYPE_NONE;
ret = devm_gpiochip_add_data(dev, gpiochip, gpio);
return ret;
}
static int msc313_gpio_remove(struct platform_device *pdev)
{
return 0;
}
static const struct of_device_id msc313_gpio_of_match[] = {
#ifdef CONFIG_MACH_INFINITY
{
.compatible = "mstar,msc313-gpio",
.data = &msc313_data,
},
#endif
{ }
};
/*
* The GPIO controller loses the state of the registers when the
* SoC goes into suspend to memory mode so we need to save some
* of the register bits before suspending and put it back when resuming
*/
static int __maybe_unused msc313_gpio_suspend(struct device *dev)
{
struct msc313_gpio *gpio = dev_get_drvdata(dev);
int i;
for (i = 0; i < gpio->gpio_data->num; i++)
gpio->saved[i] = readb_relaxed(gpio->base + gpio->gpio_data->offsets[i]) & MSC313_GPIO_BITSTOSAVE;
return 0;
}
static int __maybe_unused msc313_gpio_resume(struct device *dev)
{
struct msc313_gpio *gpio = dev_get_drvdata(dev);
int i;
for (i = 0; i < gpio->gpio_data->num; i++)
writeb_relaxed(gpio->saved[i], gpio->base + gpio->gpio_data->offsets[i]);
return 0;
}
static SIMPLE_DEV_PM_OPS(msc313_gpio_ops, msc313_gpio_suspend, msc313_gpio_resume);
static struct platform_driver msc313_gpio_driver = {
.driver = {
.name = DRIVER_NAME,
.of_match_table = msc313_gpio_of_match,
.pm = &msc313_gpio_ops,
},
.probe = msc313_gpio_probe,
.remove = msc313_gpio_remove,
};
builtin_platform_driver(msc313_gpio_driver);
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