From 33257f860a13d8b03a61ada6ce86a67001411a5f Mon Sep 17 00:00:00 2001 From: Manivannan Sadhasivam Date: Sun, 20 May 2018 10:47:35 +0530 Subject: [PATCH] pinctrl: actions: Add gpio support for Actions S900 SoC Add gpio support to pinctrl driver for Actions Semi S900 SoC. Signed-off-by: Manivannan Sadhasivam Reviewed-by: Andy Shevchenko Signed-off-by: Linus Walleij --- drivers/pinctrl/actions/Kconfig | 1 + drivers/pinctrl/actions/pinctrl-owl.c | 198 +++++++++++++++++++++++++ drivers/pinctrl/actions/pinctrl-owl.h | 20 +++ drivers/pinctrl/actions/pinctrl-s900.c | 29 +++- 4 files changed, 247 insertions(+), 1 deletion(-) diff --git a/drivers/pinctrl/actions/Kconfig b/drivers/pinctrl/actions/Kconfig index ede97cdbbc12..490927b4ea76 100644 --- a/drivers/pinctrl/actions/Kconfig +++ b/drivers/pinctrl/actions/Kconfig @@ -4,6 +4,7 @@ config PINCTRL_OWL select PINMUX select PINCONF select GENERIC_PINCONF + select GPIOLIB help Say Y here to enable Actions Semi OWL pinctrl driver diff --git a/drivers/pinctrl/actions/pinctrl-owl.c b/drivers/pinctrl/actions/pinctrl-owl.c index ee090697b1e9..76243caa08c6 100644 --- a/drivers/pinctrl/actions/pinctrl-owl.c +++ b/drivers/pinctrl/actions/pinctrl-owl.c @@ -11,6 +11,7 @@ #include #include +#include #include #include #include @@ -31,6 +32,7 @@ * struct owl_pinctrl - pinctrl state of the device * @dev: device handle * @pctrldev: pinctrl handle + * @chip: gpio chip * @lock: spinlock to protect registers * @soc: reference to soc_data * @base: pinctrl register base address @@ -38,6 +40,7 @@ struct owl_pinctrl { struct device *dev; struct pinctrl_dev *pctrldev; + struct gpio_chip chip; raw_spinlock_t lock; struct clk *clk; const struct owl_pinctrl_soc_data *soc; @@ -536,6 +539,190 @@ static struct pinctrl_desc owl_pinctrl_desc = { .owner = THIS_MODULE, }; +static const struct owl_gpio_port * +owl_gpio_get_port(struct owl_pinctrl *pctrl, unsigned int *pin) +{ + unsigned int start = 0, i; + + for (i = 0; i < pctrl->soc->nports; i++) { + const struct owl_gpio_port *port = &pctrl->soc->ports[i]; + + if (*pin >= start && *pin < start + port->pins) { + *pin -= start; + return port; + } + + start += port->pins; + } + + return NULL; +} + +static void owl_gpio_update_reg(void __iomem *base, unsigned int pin, int flag) +{ + u32 val; + + val = readl_relaxed(base); + + if (flag) + val |= BIT(pin); + else + val &= ~BIT(pin); + + writel_relaxed(val, base); +} + +static int owl_gpio_request(struct gpio_chip *chip, unsigned int offset) +{ + struct owl_pinctrl *pctrl = gpiochip_get_data(chip); + const struct owl_gpio_port *port; + void __iomem *gpio_base; + unsigned long flags; + + port = owl_gpio_get_port(pctrl, &offset); + if (WARN_ON(port == NULL)) + return -ENODEV; + + gpio_base = pctrl->base + port->offset; + + /* + * GPIOs have higher priority over other modules, so either setting + * them as OUT or IN is sufficient + */ + raw_spin_lock_irqsave(&pctrl->lock, flags); + owl_gpio_update_reg(gpio_base + port->outen, offset, true); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + + return 0; +} + +static void owl_gpio_free(struct gpio_chip *chip, unsigned int offset) +{ + struct owl_pinctrl *pctrl = gpiochip_get_data(chip); + const struct owl_gpio_port *port; + void __iomem *gpio_base; + unsigned long flags; + + port = owl_gpio_get_port(pctrl, &offset); + if (WARN_ON(port == NULL)) + return; + + gpio_base = pctrl->base + port->offset; + + raw_spin_lock_irqsave(&pctrl->lock, flags); + /* disable gpio output */ + owl_gpio_update_reg(gpio_base + port->outen, offset, false); + + /* disable gpio input */ + owl_gpio_update_reg(gpio_base + port->inen, offset, false); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); +} + +static int owl_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + struct owl_pinctrl *pctrl = gpiochip_get_data(chip); + const struct owl_gpio_port *port; + void __iomem *gpio_base; + unsigned long flags; + u32 val; + + port = owl_gpio_get_port(pctrl, &offset); + if (WARN_ON(port == NULL)) + return -ENODEV; + + gpio_base = pctrl->base + port->offset; + + raw_spin_lock_irqsave(&pctrl->lock, flags); + val = readl_relaxed(gpio_base + port->dat); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + + return !!(val & BIT(offset)); +} + +static void owl_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) +{ + struct owl_pinctrl *pctrl = gpiochip_get_data(chip); + const struct owl_gpio_port *port; + void __iomem *gpio_base; + unsigned long flags; + + port = owl_gpio_get_port(pctrl, &offset); + if (WARN_ON(port == NULL)) + return; + + gpio_base = pctrl->base + port->offset; + + raw_spin_lock_irqsave(&pctrl->lock, flags); + owl_gpio_update_reg(gpio_base + port->dat, offset, value); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); +} + +static int owl_gpio_direction_input(struct gpio_chip *chip, unsigned int offset) +{ + struct owl_pinctrl *pctrl = gpiochip_get_data(chip); + const struct owl_gpio_port *port; + void __iomem *gpio_base; + unsigned long flags; + + port = owl_gpio_get_port(pctrl, &offset); + if (WARN_ON(port == NULL)) + return -ENODEV; + + gpio_base = pctrl->base + port->offset; + + raw_spin_lock_irqsave(&pctrl->lock, flags); + owl_gpio_update_reg(gpio_base + port->outen, offset, false); + owl_gpio_update_reg(gpio_base + port->inen, offset, true); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + + return 0; +} + +static int owl_gpio_direction_output(struct gpio_chip *chip, + unsigned int offset, int value) +{ + struct owl_pinctrl *pctrl = gpiochip_get_data(chip); + const struct owl_gpio_port *port; + void __iomem *gpio_base; + unsigned long flags; + + port = owl_gpio_get_port(pctrl, &offset); + if (WARN_ON(port == NULL)) + return -ENODEV; + + gpio_base = pctrl->base + port->offset; + + raw_spin_lock_irqsave(&pctrl->lock, flags); + owl_gpio_update_reg(gpio_base + port->inen, offset, false); + owl_gpio_update_reg(gpio_base + port->outen, offset, true); + owl_gpio_update_reg(gpio_base + port->dat, offset, value); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + + return 0; +} + +static int owl_gpio_init(struct owl_pinctrl *pctrl) +{ + struct gpio_chip *chip; + int ret; + + chip = &pctrl->chip; + chip->base = -1; + chip->ngpio = pctrl->soc->ngpios; + chip->label = dev_name(pctrl->dev); + chip->parent = pctrl->dev; + chip->owner = THIS_MODULE; + chip->of_node = pctrl->dev->of_node; + + ret = gpiochip_add_data(&pctrl->chip, pctrl); + if (ret) { + dev_err(pctrl->dev, "failed to register gpiochip\n"); + return ret; + } + + return 0; +} + int owl_pinctrl_probe(struct platform_device *pdev, struct owl_pinctrl_soc_data *soc_data) { @@ -571,6 +758,13 @@ int owl_pinctrl_probe(struct platform_device *pdev, owl_pinctrl_desc.pins = soc_data->pins; owl_pinctrl_desc.npins = soc_data->npins; + pctrl->chip.direction_input = owl_gpio_direction_input; + pctrl->chip.direction_output = owl_gpio_direction_output; + pctrl->chip.get = owl_gpio_get; + pctrl->chip.set = owl_gpio_set; + pctrl->chip.request = owl_gpio_request; + pctrl->chip.free = owl_gpio_free; + pctrl->soc = soc_data; pctrl->dev = &pdev->dev; @@ -581,6 +775,10 @@ int owl_pinctrl_probe(struct platform_device *pdev, return PTR_ERR(pctrl->pctrldev); } + ret = owl_gpio_init(pctrl); + if (ret) + return ret; + platform_set_drvdata(pdev, pctrl); return 0; diff --git a/drivers/pinctrl/actions/pinctrl-owl.h b/drivers/pinctrl/actions/pinctrl-owl.h index 448f81a6db3b..74342378937c 100644 --- a/drivers/pinctrl/actions/pinctrl-owl.h +++ b/drivers/pinctrl/actions/pinctrl-owl.h @@ -114,6 +114,22 @@ struct owl_pinmux_func { unsigned int ngroups; }; +/** + * struct owl_gpio_port - Actions GPIO port info + * @offset: offset of the GPIO port. + * @pins: number of pins belongs to the GPIO port. + * @outen: offset of the output enable register. + * @inen: offset of the input enable register. + * @dat: offset of the data register. + */ +struct owl_gpio_port { + unsigned int offset; + unsigned int pins; + unsigned int outen; + unsigned int inen; + unsigned int dat; +}; + /** * struct owl_pinctrl_soc_data - Actions pin controller driver configuration * @pins: array describing all pins of the pin controller. @@ -124,6 +140,8 @@ struct owl_pinmux_func { * @ngroups: number of entries in @groups. * @padinfo: array describing the pad info of this SoC. * @ngpios: number of pingroups the driver should expose as GPIOs. + * @port: array describing all GPIO ports of this SoC. + * @nports: number of GPIO ports in this SoC. */ struct owl_pinctrl_soc_data { const struct pinctrl_pin_desc *pins; @@ -134,6 +152,8 @@ struct owl_pinctrl_soc_data { unsigned int ngroups; const struct owl_padinfo *padinfo; unsigned int ngpios; + const struct owl_gpio_port *ports; + unsigned int nports; }; int owl_pinctrl_probe(struct platform_device *pdev, diff --git a/drivers/pinctrl/actions/pinctrl-s900.c b/drivers/pinctrl/actions/pinctrl-s900.c index 08d93f8fc086..5503c7945764 100644 --- a/drivers/pinctrl/actions/pinctrl-s900.c +++ b/drivers/pinctrl/actions/pinctrl-s900.c @@ -33,6 +33,13 @@ #define PAD_SR1 (0x0274) #define PAD_SR2 (0x0278) +#define OWL_GPIO_PORT_A 0 +#define OWL_GPIO_PORT_B 1 +#define OWL_GPIO_PORT_C 2 +#define OWL_GPIO_PORT_D 3 +#define OWL_GPIO_PORT_E 4 +#define OWL_GPIO_PORT_F 5 + #define _GPIOA(offset) (offset) #define _GPIOB(offset) (32 + (offset)) #define _GPIOC(offset) (64 + (offset)) @@ -1814,6 +1821,24 @@ static struct owl_padinfo s900_padinfo[NUM_PADS] = { [SGPIO3] = PAD_INFO_PULLCTL_ST(SGPIO3) }; +#define OWL_GPIO_PORT(port, base, count, _outen, _inen, _dat) \ + [OWL_GPIO_PORT_##port] = { \ + .offset = base, \ + .pins = count, \ + .outen = _outen, \ + .inen = _inen, \ + .dat = _dat, \ + } + +static const struct owl_gpio_port s900_gpio_ports[] = { + OWL_GPIO_PORT(A, 0x0000, 32, 0x0, 0x4, 0x8), + OWL_GPIO_PORT(B, 0x000C, 32, 0x0, 0x4, 0x8), + OWL_GPIO_PORT(C, 0x0018, 12, 0x0, 0x4, 0x8), + OWL_GPIO_PORT(D, 0x0024, 30, 0x0, 0x4, 0x8), + OWL_GPIO_PORT(E, 0x0030, 32, 0x0, 0x4, 0x8), + OWL_GPIO_PORT(F, 0x00F0, 8, 0x0, 0x4, 0x8) +}; + static struct owl_pinctrl_soc_data s900_pinctrl_data = { .padinfo = s900_padinfo, .pins = (const struct pinctrl_pin_desc *)s900_pads, @@ -1822,7 +1847,9 @@ static struct owl_pinctrl_soc_data s900_pinctrl_data = { .nfunctions = ARRAY_SIZE(s900_functions), .groups = s900_groups, .ngroups = ARRAY_SIZE(s900_groups), - .ngpios = NUM_GPIOS + .ngpios = NUM_GPIOS, + .ports = s900_gpio_ports, + .nports = ARRAY_SIZE(s900_gpio_ports) }; static int s900_pinctrl_probe(struct platform_device *pdev)