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linux/drivers/gpio/gpio-ml-ioh.c
Thomas Gleixner 873e65bc09 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 167 
Based on 1 normalized pattern(s):

  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 version 2 of the license 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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 83 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070034.021731668@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:39 -07:00

598 lines
14 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/gpio/driver.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#define IOH_EDGE_FALLING 0
#define IOH_EDGE_RISING BIT(0)
#define IOH_LEVEL_L BIT(1)
#define IOH_LEVEL_H (BIT(0) | BIT(1))
#define IOH_EDGE_BOTH BIT(2)
#define IOH_IM_MASK (BIT(0) | BIT(1) | BIT(2))
#define IOH_IRQ_BASE 0
struct ioh_reg_comn {
u32 ien;
u32 istatus;
u32 idisp;
u32 iclr;
u32 imask;
u32 imaskclr;
u32 po;
u32 pi;
u32 pm;
u32 im_0;
u32 im_1;
u32 reserved;
};
struct ioh_regs {
struct ioh_reg_comn regs[8];
u32 reserve1[16];
u32 ioh_sel_reg[4];
u32 reserve2[11];
u32 srst;
};
/**
* struct ioh_gpio_reg_data - The register store data.
* @ien_reg To store contents of interrupt enable register.
* @imask_reg: To store contents of interrupt mask regist
* @po_reg: To store contents of PO register.
* @pm_reg: To store contents of PM register.
* @im0_reg: To store contents of interrupt mode regist0
* @im1_reg: To store contents of interrupt mode regist1
* @use_sel_reg: To store contents of GPIO_USE_SEL0~3
*/
struct ioh_gpio_reg_data {
u32 ien_reg;
u32 imask_reg;
u32 po_reg;
u32 pm_reg;
u32 im0_reg;
u32 im1_reg;
u32 use_sel_reg;
};
/**
* struct ioh_gpio - GPIO private data structure.
* @base: PCI base address of Memory mapped I/O register.
* @reg: Memory mapped IOH GPIO register list.
* @dev: Pointer to device structure.
* @gpio: Data for GPIO infrastructure.
* @ioh_gpio_reg: Memory mapped Register data is saved here
* when suspend.
* @gpio_use_sel: Save GPIO_USE_SEL1~4 register for PM
* @ch: Indicate GPIO channel
* @irq_base: Save base of IRQ number for interrupt
* @spinlock: Used for register access protection
*/
struct ioh_gpio {
void __iomem *base;
struct ioh_regs __iomem *reg;
struct device *dev;
struct gpio_chip gpio;
struct ioh_gpio_reg_data ioh_gpio_reg;
u32 gpio_use_sel;
int ch;
int irq_base;
spinlock_t spinlock;
};
static const int num_ports[] = {6, 12, 16, 16, 15, 16, 16, 12};
static void ioh_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
{
u32 reg_val;
struct ioh_gpio *chip = gpiochip_get_data(gpio);
unsigned long flags;
spin_lock_irqsave(&chip->spinlock, flags);
reg_val = ioread32(&chip->reg->regs[chip->ch].po);
if (val)
reg_val |= (1 << nr);
else
reg_val &= ~(1 << nr);
iowrite32(reg_val, &chip->reg->regs[chip->ch].po);
spin_unlock_irqrestore(&chip->spinlock, flags);
}
static int ioh_gpio_get(struct gpio_chip *gpio, unsigned nr)
{
struct ioh_gpio *chip = gpiochip_get_data(gpio);
return !!(ioread32(&chip->reg->regs[chip->ch].pi) & (1 << nr));
}
static int ioh_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
int val)
{
struct ioh_gpio *chip = gpiochip_get_data(gpio);
u32 pm;
u32 reg_val;
unsigned long flags;
spin_lock_irqsave(&chip->spinlock, flags);
pm = ioread32(&chip->reg->regs[chip->ch].pm) &
((1 << num_ports[chip->ch]) - 1);
pm |= (1 << nr);
iowrite32(pm, &chip->reg->regs[chip->ch].pm);
reg_val = ioread32(&chip->reg->regs[chip->ch].po);
if (val)
reg_val |= (1 << nr);
else
reg_val &= ~(1 << nr);
iowrite32(reg_val, &chip->reg->regs[chip->ch].po);
spin_unlock_irqrestore(&chip->spinlock, flags);
return 0;
}
static int ioh_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
{
struct ioh_gpio *chip = gpiochip_get_data(gpio);
u32 pm;
unsigned long flags;
spin_lock_irqsave(&chip->spinlock, flags);
pm = ioread32(&chip->reg->regs[chip->ch].pm) &
((1 << num_ports[chip->ch]) - 1);
pm &= ~(1 << nr);
iowrite32(pm, &chip->reg->regs[chip->ch].pm);
spin_unlock_irqrestore(&chip->spinlock, flags);
return 0;
}
#ifdef CONFIG_PM
/*
* Save register configuration and disable interrupts.
*/
static void ioh_gpio_save_reg_conf(struct ioh_gpio *chip)
{
int i;
for (i = 0; i < 8; i ++, chip++) {
chip->ioh_gpio_reg.po_reg =
ioread32(&chip->reg->regs[chip->ch].po);
chip->ioh_gpio_reg.pm_reg =
ioread32(&chip->reg->regs[chip->ch].pm);
chip->ioh_gpio_reg.ien_reg =
ioread32(&chip->reg->regs[chip->ch].ien);
chip->ioh_gpio_reg.imask_reg =
ioread32(&chip->reg->regs[chip->ch].imask);
chip->ioh_gpio_reg.im0_reg =
ioread32(&chip->reg->regs[chip->ch].im_0);
chip->ioh_gpio_reg.im1_reg =
ioread32(&chip->reg->regs[chip->ch].im_1);
if (i < 4)
chip->ioh_gpio_reg.use_sel_reg =
ioread32(&chip->reg->ioh_sel_reg[i]);
}
}
/*
* This function restores the register configuration of the GPIO device.
*/
static void ioh_gpio_restore_reg_conf(struct ioh_gpio *chip)
{
int i;
for (i = 0; i < 8; i ++, chip++) {
iowrite32(chip->ioh_gpio_reg.po_reg,
&chip->reg->regs[chip->ch].po);
iowrite32(chip->ioh_gpio_reg.pm_reg,
&chip->reg->regs[chip->ch].pm);
iowrite32(chip->ioh_gpio_reg.ien_reg,
&chip->reg->regs[chip->ch].ien);
iowrite32(chip->ioh_gpio_reg.imask_reg,
&chip->reg->regs[chip->ch].imask);
iowrite32(chip->ioh_gpio_reg.im0_reg,
&chip->reg->regs[chip->ch].im_0);
iowrite32(chip->ioh_gpio_reg.im1_reg,
&chip->reg->regs[chip->ch].im_1);
if (i < 4)
iowrite32(chip->ioh_gpio_reg.use_sel_reg,
&chip->reg->ioh_sel_reg[i]);
}
}
#endif
static int ioh_gpio_to_irq(struct gpio_chip *gpio, unsigned offset)
{
struct ioh_gpio *chip = gpiochip_get_data(gpio);
return chip->irq_base + offset;
}
static void ioh_gpio_setup(struct ioh_gpio *chip, int num_port)
{
struct gpio_chip *gpio = &chip->gpio;
gpio->label = dev_name(chip->dev);
gpio->owner = THIS_MODULE;
gpio->direction_input = ioh_gpio_direction_input;
gpio->get = ioh_gpio_get;
gpio->direction_output = ioh_gpio_direction_output;
gpio->set = ioh_gpio_set;
gpio->dbg_show = NULL;
gpio->base = -1;
gpio->ngpio = num_port;
gpio->can_sleep = false;
gpio->to_irq = ioh_gpio_to_irq;
}
static int ioh_irq_type(struct irq_data *d, unsigned int type)
{
u32 im;
void __iomem *im_reg;
u32 ien;
u32 im_pos;
int ch;
unsigned long flags;
u32 val;
int irq = d->irq;
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct ioh_gpio *chip = gc->private;
ch = irq - chip->irq_base;
if (irq <= chip->irq_base + 7) {
im_reg = &chip->reg->regs[chip->ch].im_0;
im_pos = ch;
} else {
im_reg = &chip->reg->regs[chip->ch].im_1;
im_pos = ch - 8;
}
dev_dbg(chip->dev, "%s:irq=%d type=%d ch=%d pos=%d type=%d\n",
__func__, irq, type, ch, im_pos, type);
spin_lock_irqsave(&chip->spinlock, flags);
switch (type) {
case IRQ_TYPE_EDGE_RISING:
val = IOH_EDGE_RISING;
break;
case IRQ_TYPE_EDGE_FALLING:
val = IOH_EDGE_FALLING;
break;
case IRQ_TYPE_EDGE_BOTH:
val = IOH_EDGE_BOTH;
break;
case IRQ_TYPE_LEVEL_HIGH:
val = IOH_LEVEL_H;
break;
case IRQ_TYPE_LEVEL_LOW:
val = IOH_LEVEL_L;
break;
case IRQ_TYPE_PROBE:
goto end;
default:
dev_warn(chip->dev, "%s: unknown type(%dd)",
__func__, type);
goto end;
}
/* Set interrupt mode */
im = ioread32(im_reg) & ~(IOH_IM_MASK << (im_pos * 4));
iowrite32(im | (val << (im_pos * 4)), im_reg);
/* iclr */
iowrite32(BIT(ch), &chip->reg->regs[chip->ch].iclr);
/* IMASKCLR */
iowrite32(BIT(ch), &chip->reg->regs[chip->ch].imaskclr);
/* Enable interrupt */
ien = ioread32(&chip->reg->regs[chip->ch].ien);
iowrite32(ien | BIT(ch), &chip->reg->regs[chip->ch].ien);
end:
spin_unlock_irqrestore(&chip->spinlock, flags);
return 0;
}
static void ioh_irq_unmask(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct ioh_gpio *chip = gc->private;
iowrite32(1 << (d->irq - chip->irq_base),
&chip->reg->regs[chip->ch].imaskclr);
}
static void ioh_irq_mask(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct ioh_gpio *chip = gc->private;
iowrite32(1 << (d->irq - chip->irq_base),
&chip->reg->regs[chip->ch].imask);
}
static void ioh_irq_disable(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct ioh_gpio *chip = gc->private;
unsigned long flags;
u32 ien;
spin_lock_irqsave(&chip->spinlock, flags);
ien = ioread32(&chip->reg->regs[chip->ch].ien);
ien &= ~(1 << (d->irq - chip->irq_base));
iowrite32(ien, &chip->reg->regs[chip->ch].ien);
spin_unlock_irqrestore(&chip->spinlock, flags);
}
static void ioh_irq_enable(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct ioh_gpio *chip = gc->private;
unsigned long flags;
u32 ien;
spin_lock_irqsave(&chip->spinlock, flags);
ien = ioread32(&chip->reg->regs[chip->ch].ien);
ien |= 1 << (d->irq - chip->irq_base);
iowrite32(ien, &chip->reg->regs[chip->ch].ien);
spin_unlock_irqrestore(&chip->spinlock, flags);
}
static irqreturn_t ioh_gpio_handler(int irq, void *dev_id)
{
struct ioh_gpio *chip = dev_id;
u32 reg_val;
int i, j;
int ret = IRQ_NONE;
for (i = 0; i < 8; i++, chip++) {
reg_val = ioread32(&chip->reg->regs[i].istatus);
for (j = 0; j < num_ports[i]; j++) {
if (reg_val & BIT(j)) {
dev_dbg(chip->dev,
"%s:[%d]:irq=%d status=0x%x\n",
__func__, j, irq, reg_val);
iowrite32(BIT(j),
&chip->reg->regs[chip->ch].iclr);
generic_handle_irq(chip->irq_base + j);
ret = IRQ_HANDLED;
}
}
}
return ret;
}
static int ioh_gpio_alloc_generic_chip(struct ioh_gpio *chip,
unsigned int irq_start,
unsigned int num)
{
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
int rv;
gc = devm_irq_alloc_generic_chip(chip->dev, "ioh_gpio", 1, irq_start,
chip->base, handle_simple_irq);
if (!gc)
return -ENOMEM;
gc->private = chip;
ct = gc->chip_types;
ct->chip.irq_mask = ioh_irq_mask;
ct->chip.irq_unmask = ioh_irq_unmask;
ct->chip.irq_set_type = ioh_irq_type;
ct->chip.irq_disable = ioh_irq_disable;
ct->chip.irq_enable = ioh_irq_enable;
rv = devm_irq_setup_generic_chip(chip->dev, gc, IRQ_MSK(num),
IRQ_GC_INIT_MASK_CACHE,
IRQ_NOREQUEST | IRQ_NOPROBE, 0);
return rv;
}
static int ioh_gpio_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
int ret;
int i, j;
struct ioh_gpio *chip;
void __iomem *base;
void *chip_save;
int irq_base;
ret = pci_enable_device(pdev);
if (ret) {
dev_err(&pdev->dev, "%s : pci_enable_device failed", __func__);
goto err_pci_enable;
}
ret = pci_request_regions(pdev, KBUILD_MODNAME);
if (ret) {
dev_err(&pdev->dev, "pci_request_regions failed-%d", ret);
goto err_request_regions;
}
base = pci_iomap(pdev, 1, 0);
if (!base) {
dev_err(&pdev->dev, "%s : pci_iomap failed", __func__);
ret = -ENOMEM;
goto err_iomap;
}
chip_save = kcalloc(8, sizeof(*chip), GFP_KERNEL);
if (chip_save == NULL) {
ret = -ENOMEM;
goto err_kzalloc;
}
chip = chip_save;
for (i = 0; i < 8; i++, chip++) {
chip->dev = &pdev->dev;
chip->base = base;
chip->reg = chip->base;
chip->ch = i;
spin_lock_init(&chip->spinlock);
ioh_gpio_setup(chip, num_ports[i]);
ret = gpiochip_add_data(&chip->gpio, chip);
if (ret) {
dev_err(&pdev->dev, "IOH gpio: Failed to register GPIO\n");
goto err_gpiochip_add;
}
}
chip = chip_save;
for (j = 0; j < 8; j++, chip++) {
irq_base = devm_irq_alloc_descs(&pdev->dev, -1, IOH_IRQ_BASE,
num_ports[j], NUMA_NO_NODE);
if (irq_base < 0) {
dev_warn(&pdev->dev,
"ml_ioh_gpio: Failed to get IRQ base num\n");
ret = irq_base;
goto err_gpiochip_add;
}
chip->irq_base = irq_base;
ret = ioh_gpio_alloc_generic_chip(chip,
irq_base, num_ports[j]);
if (ret)
goto err_gpiochip_add;
}
chip = chip_save;
ret = devm_request_irq(&pdev->dev, pdev->irq, ioh_gpio_handler,
IRQF_SHARED, KBUILD_MODNAME, chip);
if (ret != 0) {
dev_err(&pdev->dev,
"%s request_irq failed\n", __func__);
goto err_gpiochip_add;
}
pci_set_drvdata(pdev, chip);
return 0;
err_gpiochip_add:
chip = chip_save;
while (--i >= 0) {
gpiochip_remove(&chip->gpio);
chip++;
}
kfree(chip_save);
err_kzalloc:
pci_iounmap(pdev, base);
err_iomap:
pci_release_regions(pdev);
err_request_regions:
pci_disable_device(pdev);
err_pci_enable:
dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
return ret;
}
static void ioh_gpio_remove(struct pci_dev *pdev)
{
int i;
struct ioh_gpio *chip = pci_get_drvdata(pdev);
void *chip_save;
chip_save = chip;
for (i = 0; i < 8; i++, chip++)
gpiochip_remove(&chip->gpio);
chip = chip_save;
pci_iounmap(pdev, chip->base);
pci_release_regions(pdev);
pci_disable_device(pdev);
kfree(chip);
}
#ifdef CONFIG_PM
static int ioh_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
{
s32 ret;
struct ioh_gpio *chip = pci_get_drvdata(pdev);
unsigned long flags;
spin_lock_irqsave(&chip->spinlock, flags);
ioh_gpio_save_reg_conf(chip);
spin_unlock_irqrestore(&chip->spinlock, flags);
ret = pci_save_state(pdev);
if (ret) {
dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
return ret;
}
pci_disable_device(pdev);
pci_set_power_state(pdev, PCI_D0);
ret = pci_enable_wake(pdev, PCI_D0, 1);
if (ret)
dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);
return 0;
}
static int ioh_gpio_resume(struct pci_dev *pdev)
{
s32 ret;
struct ioh_gpio *chip = pci_get_drvdata(pdev);
unsigned long flags;
ret = pci_enable_wake(pdev, PCI_D0, 0);
pci_set_power_state(pdev, PCI_D0);
ret = pci_enable_device(pdev);
if (ret) {
dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
return ret;
}
pci_restore_state(pdev);
spin_lock_irqsave(&chip->spinlock, flags);
iowrite32(0x01, &chip->reg->srst);
iowrite32(0x00, &chip->reg->srst);
ioh_gpio_restore_reg_conf(chip);
spin_unlock_irqrestore(&chip->spinlock, flags);
return 0;
}
#else
#define ioh_gpio_suspend NULL
#define ioh_gpio_resume NULL
#endif
static const struct pci_device_id ioh_gpio_pcidev_id[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x802E) },
{ 0, }
};
MODULE_DEVICE_TABLE(pci, ioh_gpio_pcidev_id);
static struct pci_driver ioh_gpio_driver = {
.name = "ml_ioh_gpio",
.id_table = ioh_gpio_pcidev_id,
.probe = ioh_gpio_probe,
.remove = ioh_gpio_remove,
.suspend = ioh_gpio_suspend,
.resume = ioh_gpio_resume
};
module_pci_driver(ioh_gpio_driver);
MODULE_DESCRIPTION("OKI SEMICONDUCTOR ML-IOH series GPIO Driver");
MODULE_LICENSE("GPL");
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