From 38eb18a6f92da886fc1af509d25e8f7a49e23d9a Mon Sep 17 00:00:00 2001 From: Tomoya MORINAGA Date: Thu, 21 Jul 2011 09:19:59 +0900 Subject: [PATCH] gpio-pch: Support interrupt function Signed-off-by: Tomoya MORINAGA Signed-off-by: Grant Likely --- drivers/gpio/Kconfig | 1 + drivers/gpio/gpio-pch.c | 187 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 188 insertions(+) diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 04499c19e986..de5fea60b385 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -388,6 +388,7 @@ config GPIO_LANGWELL config GPIO_PCH tristate "Intel EG20T PCH / OKI SEMICONDUCTOR ML7223 IOH GPIO" depends on PCI && X86 + select GENERIC_IRQ_CHIP help This driver is for PCH(Platform controller Hub) GPIO of Intel Topcliff which is an IOH(Input/Output Hub) for x86 embedded processor. diff --git a/drivers/gpio/gpio-pch.c b/drivers/gpio/gpio-pch.c index 7f773afeb340..46b5209878f6 100644 --- a/drivers/gpio/gpio-pch.c +++ b/drivers/gpio/gpio-pch.c @@ -17,6 +17,17 @@ #include #include #include +#include +#include + +#define PCH_EDGE_FALLING 0 +#define PCH_EDGE_RISING BIT(0) +#define PCH_LEVEL_L BIT(1) +#define PCH_LEVEL_H (BIT(0) | BIT(1)) +#define PCH_EDGE_BOTH BIT(2) +#define PCH_IM_MASK (BIT(0) | BIT(1) | BIT(2)) + +#define PCH_IRQ_BASE 24 struct pch_regs { u32 ien; @@ -50,6 +61,8 @@ static int gpio_pins[] = { /** * struct pch_gpio_reg_data - The register store data. + * @ien_reg: To store contents of IEN register. + * @imask_reg: To store contents of IMASK register. * @po_reg: To store contents of PO register. * @pm_reg: To store contents of PM register. * @im0_reg: To store contents of IM0 register. @@ -58,6 +71,8 @@ static int gpio_pins[] = { * (Only ML7223 Bus-n) */ struct pch_gpio_reg_data { + u32 ien_reg; + u32 imask_reg; u32 po_reg; u32 pm_reg; u32 im0_reg; @@ -73,6 +88,8 @@ struct pch_gpio_reg_data { * @gpio: Data for GPIO infrastructure. * @pch_gpio_reg: Memory mapped Register data is saved here * when suspend. + * @lock: Used for register access protection + * @irq_base: Save base of IRQ number for interrupt * @ioh: IOH ID * @spinlock: Used for register access protection in * interrupt context pch_irq_mask, @@ -85,6 +102,7 @@ struct pch_gpio { struct gpio_chip gpio; struct pch_gpio_reg_data pch_gpio_reg; struct mutex lock; + int irq_base; enum pch_type_t ioh; spinlock_t spinlock; }; @@ -155,6 +173,8 @@ static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr) */ static void pch_gpio_save_reg_conf(struct pch_gpio *chip) { + chip->pch_gpio_reg.ien_reg = ioread32(&chip->reg->ien); + chip->pch_gpio_reg.imask_reg = ioread32(&chip->reg->imask); chip->pch_gpio_reg.po_reg = ioread32(&chip->reg->po); chip->pch_gpio_reg.pm_reg = ioread32(&chip->reg->pm); chip->pch_gpio_reg.im0_reg = ioread32(&chip->reg->im0); @@ -170,6 +190,8 @@ static void pch_gpio_save_reg_conf(struct pch_gpio *chip) */ static void pch_gpio_restore_reg_conf(struct pch_gpio *chip) { + iowrite32(chip->pch_gpio_reg.ien_reg, &chip->reg->ien); + iowrite32(chip->pch_gpio_reg.imask_reg, &chip->reg->imask); /* to store contents of PO register */ iowrite32(chip->pch_gpio_reg.po_reg, &chip->reg->po); /* to store contents of PM register */ @@ -182,6 +204,12 @@ static void pch_gpio_restore_reg_conf(struct pch_gpio *chip) &chip->reg->gpio_use_sel); } +static int pch_gpio_to_irq(struct gpio_chip *gpio, unsigned offset) +{ + struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio); + return chip->irq_base + offset; +} + static void pch_gpio_setup(struct pch_gpio *chip) { struct gpio_chip *gpio = &chip->gpio; @@ -196,6 +224,130 @@ static void pch_gpio_setup(struct pch_gpio *chip) gpio->base = -1; gpio->ngpio = gpio_pins[chip->ioh]; gpio->can_sleep = 0; + gpio->to_irq = pch_gpio_to_irq; +} + +static int pch_irq_type(struct irq_data *d, unsigned int type) +{ + u32 im; + u32 *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 pch_gpio *chip = gc->private; + + ch = irq - chip->irq_base; + if (irq <= chip->irq_base + 7) { + im_reg = &chip->reg->im0; + im_pos = ch; + } else { + im_reg = &chip->reg->im1; + im_pos = ch - 8; + } + dev_dbg(chip->dev, "%s:irq=%d type=%d ch=%d pos=%d\n", + __func__, irq, type, ch, im_pos); + + spin_lock_irqsave(&chip->spinlock, flags); + + switch (type) { + case IRQ_TYPE_EDGE_RISING: + val = PCH_EDGE_RISING; + break; + case IRQ_TYPE_EDGE_FALLING: + val = PCH_EDGE_FALLING; + break; + case IRQ_TYPE_EDGE_BOTH: + val = PCH_EDGE_BOTH; + break; + case IRQ_TYPE_LEVEL_HIGH: + val = PCH_LEVEL_H; + break; + case IRQ_TYPE_LEVEL_LOW: + val = PCH_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) & ~(PCH_IM_MASK << (im_pos * 4)); + iowrite32(im | (val << (im_pos * 4)), im_reg); + + /* iclr */ + iowrite32(BIT(ch), &chip->reg->iclr); + + /* IMASKCLR */ + iowrite32(BIT(ch), &chip->reg->imaskclr); + + /* Enable interrupt */ + ien = ioread32(&chip->reg->ien); + iowrite32(ien | BIT(ch), &chip->reg->ien); +end: + spin_unlock_irqrestore(&chip->spinlock, flags); + + return 0; +} + +static void pch_irq_unmask(struct irq_data *d) +{ + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); + struct pch_gpio *chip = gc->private; + + iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->imaskclr); +} + +static void pch_irq_mask(struct irq_data *d) +{ + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); + struct pch_gpio *chip = gc->private; + + iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->imask); +} + +static irqreturn_t pch_gpio_handler(int irq, void *dev_id) +{ + struct pch_gpio *chip = dev_id; + u32 reg_val = ioread32(&chip->reg->istatus); + int i; + int ret = IRQ_NONE; + + for (i = 0; i < gpio_pins[chip->ioh]; i++) { + if (reg_val & BIT(i)) { + dev_dbg(chip->dev, "%s:[%d]:irq=%d status=0x%x\n", + __func__, i, irq, reg_val); + iowrite32(BIT(i), &chip->reg->iclr); + generic_handle_irq(chip->irq_base + i); + ret = IRQ_HANDLED; + } + } + return ret; +} + +static __devinit void pch_gpio_alloc_generic_chip(struct pch_gpio *chip, + unsigned int irq_start, unsigned int num) +{ + struct irq_chip_generic *gc; + struct irq_chip_type *ct; + + gc = irq_alloc_generic_chip("pch_gpio", 1, irq_start, chip->base, + handle_simple_irq); + gc->private = chip; + ct = gc->chip_types; + + ct->chip.irq_mask = pch_irq_mask; + ct->chip.irq_unmask = pch_irq_unmask; + ct->chip.irq_set_type = pch_irq_type; + + irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE, + IRQ_NOREQUEST | IRQ_NOPROBE, 0); } static int __devinit pch_gpio_probe(struct pci_dev *pdev, @@ -203,6 +355,7 @@ static int __devinit pch_gpio_probe(struct pci_dev *pdev, { s32 ret; struct pch_gpio *chip; + int irq_base; chip = kzalloc(sizeof(*chip), GFP_KERNEL); if (chip == NULL) @@ -245,8 +398,36 @@ static int __devinit pch_gpio_probe(struct pci_dev *pdev, goto err_gpiochip_add; } + irq_base = irq_alloc_descs(-1, 0, gpio_pins[chip->ioh], GFP_KERNEL); + if (irq_base < 0) { + dev_warn(&pdev->dev, "PCH gpio: Failed to get IRQ base num\n"); + chip->irq_base = -1; + goto end; + } + chip->irq_base = irq_base; + + ret = request_irq(pdev->irq, pch_gpio_handler, + IRQF_SHARED, KBUILD_MODNAME, chip); + if (ret != 0) { + dev_err(&pdev->dev, + "%s request_irq failed\n", __func__); + goto err_request_irq; + } + + pch_gpio_alloc_generic_chip(chip, irq_base, gpio_pins[chip->ioh]); + + /* Initialize interrupt ien register */ + iowrite32(0, &chip->reg->ien); +end: return 0; +err_request_irq: + irq_free_descs(irq_base, gpio_pins[chip->ioh]); + + ret = gpiochip_remove(&chip->gpio); + if (ret) + dev_err(&pdev->dev, "%s gpiochip_remove failed\n", __func__); + err_gpiochip_add: pci_iounmap(pdev, chip->base); @@ -267,6 +448,12 @@ static void __devexit pch_gpio_remove(struct pci_dev *pdev) int err; struct pch_gpio *chip = pci_get_drvdata(pdev); + if (chip->irq_base != -1) { + free_irq(pdev->irq, chip); + + irq_free_descs(chip->irq_base, gpio_pins[chip->ioh]); + } + err = gpiochip_remove(&chip->gpio); if (err) dev_err(&pdev->dev, "Failed gpiochip_remove\n"); -- 2.20.1