diff options
Diffstat (limited to 'drivers/pinctrl/intel/pinctrl-intel.c')
| -rw-r--r-- | drivers/pinctrl/intel/pinctrl-intel.c | 163 |
1 files changed, 91 insertions, 72 deletions
diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c index 54848b8de..26f6b6ffe 100644 --- a/drivers/pinctrl/intel/pinctrl-intel.c +++ b/drivers/pinctrl/intel/pinctrl-intel.c @@ -12,6 +12,7 @@ #include <linux/module.h> #include <linux/init.h> +#include <linux/interrupt.h> #include <linux/acpi.h> #include <linux/gpio.h> #include <linux/gpio/driver.h> @@ -24,9 +25,6 @@ #include "pinctrl-intel.h" -/* Maximum number of pads in each group */ -#define NPADS_IN_GPP 24 - /* Offset from regs */ #define PADBAR 0x00c #define GPI_IS 0x100 @@ -36,6 +34,7 @@ #define PADOWN_BITS 4 #define PADOWN_SHIFT(p) ((p) % 8 * PADOWN_BITS) #define PADOWN_MASK(p) (0xf << PADOWN_SHIFT(p)) +#define PADOWN_GPP(p) ((p) / 8) /* Offset from pad_regs */ #define PADCFG0 0x000 @@ -141,7 +140,7 @@ static void __iomem *intel_get_padcfg(struct intel_pinctrl *pctrl, unsigned pin, static bool intel_pad_owned_by_host(struct intel_pinctrl *pctrl, unsigned pin) { const struct intel_community *community; - unsigned padno, gpp, gpp_offset, offset; + unsigned padno, gpp, offset, group; void __iomem *padown; community = intel_get_community(pctrl, pin); @@ -151,16 +150,15 @@ static bool intel_pad_owned_by_host(struct intel_pinctrl *pctrl, unsigned pin) return true; padno = pin_to_padno(community, pin); - gpp = padno / NPADS_IN_GPP; - gpp_offset = padno % NPADS_IN_GPP; - offset = community->padown_offset + gpp * 16 + (gpp_offset / 8) * 4; + group = padno / community->gpp_size; + gpp = PADOWN_GPP(padno % community->gpp_size); + offset = community->padown_offset + 0x10 * group + gpp * 4; padown = community->regs + offset; return !(readl(padown) & PADOWN_MASK(padno)); } -static bool intel_pad_reserved_for_acpi(struct intel_pinctrl *pctrl, - unsigned pin) +static bool intel_pad_acpi_mode(struct intel_pinctrl *pctrl, unsigned pin) { const struct intel_community *community; unsigned padno, gpp, offset; @@ -173,11 +171,11 @@ static bool intel_pad_reserved_for_acpi(struct intel_pinctrl *pctrl, return false; padno = pin_to_padno(community, pin); - gpp = padno / NPADS_IN_GPP; + gpp = padno / community->gpp_size; offset = community->hostown_offset + gpp * 4; hostown = community->regs + offset; - return !(readl(hostown) & BIT(padno % NPADS_IN_GPP)); + return !(readl(hostown) & BIT(padno % community->gpp_size)); } static bool intel_pad_locked(struct intel_pinctrl *pctrl, unsigned pin) @@ -193,7 +191,7 @@ static bool intel_pad_locked(struct intel_pinctrl *pctrl, unsigned pin) return false; padno = pin_to_padno(community, pin); - gpp = padno / NPADS_IN_GPP; + gpp = padno / community->gpp_size; /* * If PADCFGLOCK and PADCFGLOCKTX bits are both clear for this pad, @@ -202,12 +200,12 @@ static bool intel_pad_locked(struct intel_pinctrl *pctrl, unsigned pin) */ offset = community->padcfglock_offset + gpp * 8; value = readl(community->regs + offset); - if (value & BIT(pin % NPADS_IN_GPP)) + if (value & BIT(pin % community->gpp_size)) return true; offset = community->padcfglock_offset + 4 + gpp * 8; value = readl(community->regs + offset); - if (value & BIT(pin % NPADS_IN_GPP)) + if (value & BIT(pin % community->gpp_size)) return true; return false; @@ -216,7 +214,6 @@ static bool intel_pad_locked(struct intel_pinctrl *pctrl, unsigned pin) static bool intel_pad_usable(struct intel_pinctrl *pctrl, unsigned pin) { return intel_pad_owned_by_host(pctrl, pin) && - !intel_pad_reserved_for_acpi(pctrl, pin) && !intel_pad_locked(pctrl, pin); } @@ -269,7 +266,7 @@ static void intel_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s, seq_printf(s, "0x%08x 0x%08x", cfg0, cfg1); locked = intel_pad_locked(pctrl, pin); - acpi = intel_pad_reserved_for_acpi(pctrl, pin); + acpi = intel_pad_acpi_mode(pctrl, pin); if (locked || acpi) { seq_puts(s, " ["); @@ -597,16 +594,6 @@ static const struct pinctrl_desc intel_pinctrl_desc = { .owner = THIS_MODULE, }; -static int intel_gpio_request(struct gpio_chip *chip, unsigned offset) -{ - return pinctrl_request_gpio(chip->base + offset); -} - -static void intel_gpio_free(struct gpio_chip *chip, unsigned offset) -{ - pinctrl_free_gpio(chip->base + offset); -} - static int intel_gpio_get(struct gpio_chip *chip, unsigned offset) { struct intel_pinctrl *pctrl = gpiochip_to_pinctrl(chip); @@ -654,8 +641,8 @@ static int intel_gpio_direction_output(struct gpio_chip *chip, unsigned offset, static const struct gpio_chip intel_gpio_chip = { .owner = THIS_MODULE, - .request = intel_gpio_request, - .free = intel_gpio_free, + .request = gpiochip_generic_request, + .free = gpiochip_generic_free, .direction_input = intel_gpio_direction_input, .direction_output = intel_gpio_direction_output, .get = intel_gpio_get, @@ -674,8 +661,8 @@ static void intel_gpio_irq_ack(struct irq_data *d) community = intel_get_community(pctrl, pin); if (community) { unsigned padno = pin_to_padno(community, pin); - unsigned gpp_offset = padno % NPADS_IN_GPP; - unsigned gpp = padno / NPADS_IN_GPP; + unsigned gpp_offset = padno % community->gpp_size; + unsigned gpp = padno / community->gpp_size; writel(BIT(gpp_offset), community->regs + GPI_IS + gpp * 4); } @@ -696,8 +683,8 @@ static void intel_gpio_irq_mask_unmask(struct irq_data *d, bool mask) community = intel_get_community(pctrl, pin); if (community) { unsigned padno = pin_to_padno(community, pin); - unsigned gpp_offset = padno % NPADS_IN_GPP; - unsigned gpp = padno / NPADS_IN_GPP; + unsigned gpp_offset = padno % community->gpp_size; + unsigned gpp = padno / community->gpp_size; void __iomem *reg; u32 value; @@ -736,6 +723,16 @@ static int intel_gpio_irq_type(struct irq_data *d, unsigned type) if (!reg) return -EINVAL; + /* + * If the pin is in ACPI mode it is still usable as a GPIO but it + * cannot be used as IRQ because GPI_IS status bit will not be + * updated by the host controller hardware. + */ + if (intel_pad_acpi_mode(pctrl, pin)) { + dev_warn(pctrl->dev, "pin %u cannot be used as IRQ\n", pin); + return -EPERM; + } + spin_lock_irqsave(&pctrl->lock, flags); value = readl(reg); @@ -781,8 +778,8 @@ static int intel_gpio_irq_wake(struct irq_data *d, unsigned int on) return -EINVAL; padno = pin_to_padno(community, pin); - gpp = padno / NPADS_IN_GPP; - gpp_offset = padno % NPADS_IN_GPP; + gpp = padno / community->gpp_size; + gpp_offset = padno % community->gpp_size; /* Clear the existing wake status */ writel(BIT(gpp_offset), community->regs + GPI_GPE_STS + gpp * 4); @@ -803,9 +800,11 @@ static int intel_gpio_irq_wake(struct irq_data *d, unsigned int on) return 0; } -static void intel_gpio_community_irq_handler(struct gpio_chip *gc, +static irqreturn_t intel_gpio_community_irq_handler(struct intel_pinctrl *pctrl, const struct intel_community *community) { + struct gpio_chip *gc = &pctrl->chip; + irqreturn_t ret = IRQ_NONE; int gpp; for (gpp = 0; gpp < community->ngpps; gpp++) { @@ -818,38 +817,42 @@ static void intel_gpio_community_irq_handler(struct gpio_chip *gc, /* Only interrupts that are enabled */ pending &= enabled; - for_each_set_bit(gpp_offset, &pending, NPADS_IN_GPP) { + for_each_set_bit(gpp_offset, &pending, community->gpp_size) { unsigned padno, irq; /* * The last group in community can have less pins * than NPADS_IN_GPP. */ - padno = gpp_offset + gpp * NPADS_IN_GPP; + padno = gpp_offset + gpp * community->gpp_size; if (padno >= community->npins) break; irq = irq_find_mapping(gc->irqdomain, community->pin_base + padno); generic_handle_irq(irq); + + ret |= IRQ_HANDLED; } } + + return ret; } -static void intel_gpio_irq_handler(struct irq_desc *desc) +static irqreturn_t intel_gpio_irq(int irq, void *data) { - struct gpio_chip *gc = irq_desc_get_handler_data(desc); - struct intel_pinctrl *pctrl = gpiochip_to_pinctrl(gc); - struct irq_chip *chip = irq_desc_get_chip(desc); + const struct intel_community *community; + struct intel_pinctrl *pctrl = data; + irqreturn_t ret = IRQ_NONE; int i; - chained_irq_enter(chip, desc); - /* Need to check all communities for pending interrupts */ - for (i = 0; i < pctrl->ncommunities; i++) - intel_gpio_community_irq_handler(gc, &pctrl->communities[i]); + for (i = 0; i < pctrl->ncommunities; i++) { + community = &pctrl->communities[i]; + ret |= intel_gpio_community_irq_handler(pctrl, community); + } - chained_irq_exit(chip, desc); + return ret; } static struct irq_chip intel_gpio_irqchip = { @@ -861,26 +864,6 @@ static struct irq_chip intel_gpio_irqchip = { .irq_set_wake = intel_gpio_irq_wake, }; -static void intel_gpio_irq_init(struct intel_pinctrl *pctrl) -{ - size_t i; - - for (i = 0; i < pctrl->ncommunities; i++) { - const struct intel_community *community; - void __iomem *base; - unsigned gpp; - - community = &pctrl->communities[i]; - base = community->regs; - - for (gpp = 0; gpp < community->ngpps; gpp++) { - /* Mask and clear all interrupts */ - writel(0, base + community->ie_offset + gpp * 4); - writel(0xffff, base + GPI_IS + gpp * 4); - } - } -} - static int intel_gpio_probe(struct intel_pinctrl *pctrl, int irq) { int ret; @@ -902,21 +885,36 @@ static int intel_gpio_probe(struct intel_pinctrl *pctrl, int irq) 0, 0, pctrl->soc->npins); if (ret) { dev_err(pctrl->dev, "failed to add GPIO pin range\n"); - gpiochip_remove(&pctrl->chip); - return ret; + goto fail; + } + + /* + * We need to request the interrupt here (instead of providing chip + * to the irq directly) because on some platforms several GPIO + * controllers share the same interrupt line. + */ + ret = devm_request_irq(pctrl->dev, irq, intel_gpio_irq, IRQF_SHARED, + dev_name(pctrl->dev), pctrl); + if (ret) { + dev_err(pctrl->dev, "failed to request interrupt\n"); + goto fail; } ret = gpiochip_irqchip_add(&pctrl->chip, &intel_gpio_irqchip, 0, handle_simple_irq, IRQ_TYPE_NONE); if (ret) { dev_err(pctrl->dev, "failed to add irqchip\n"); - gpiochip_remove(&pctrl->chip); - return ret; + goto fail; } gpiochip_set_chained_irqchip(&pctrl->chip, &intel_gpio_irqchip, irq, - intel_gpio_irq_handler); + NULL); return 0; + +fail: + gpiochip_remove(&pctrl->chip); + + return ret; } static int intel_pinctrl_pm_init(struct intel_pinctrl *pctrl) @@ -1002,7 +1000,8 @@ int intel_pinctrl_probe(struct platform_device *pdev, community->regs = regs; community->pad_regs = regs + padbar; - community->ngpps = DIV_ROUND_UP(community->npins, NPADS_IN_GPP); + community->ngpps = DIV_ROUND_UP(community->npins, + community->gpp_size); } irq = platform_get_irq(pdev, 0); @@ -1087,6 +1086,26 @@ int intel_pinctrl_suspend(struct device *dev) } EXPORT_SYMBOL_GPL(intel_pinctrl_suspend); +static void intel_gpio_irq_init(struct intel_pinctrl *pctrl) +{ + size_t i; + + for (i = 0; i < pctrl->ncommunities; i++) { + const struct intel_community *community; + void __iomem *base; + unsigned gpp; + + community = &pctrl->communities[i]; + base = community->regs; + + for (gpp = 0; gpp < community->ngpps; gpp++) { + /* Mask and clear all interrupts */ + writel(0, base + community->ie_offset + gpp * 4); + writel(0xffff, base + GPI_IS + gpp * 4); + } + } +} + int intel_pinctrl_resume(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); |