diff options
Diffstat (limited to 'drivers/pinctrl/actions/pinctrl-owl.c')
| -rw-r--r-- | drivers/pinctrl/actions/pinctrl-owl.c | 785 |
1 files changed, 785 insertions, 0 deletions
diff --git a/drivers/pinctrl/actions/pinctrl-owl.c b/drivers/pinctrl/actions/pinctrl-owl.c new file mode 100644 index 000000000000..76243caa08c6 --- /dev/null +++ b/drivers/pinctrl/actions/pinctrl-owl.c @@ -0,0 +1,785 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * OWL SoC's Pinctrl driver + * + * Copyright (c) 2014 Actions Semi Inc. + * Author: David Liu <liuwei@actions-semi.com> + * + * Copyright (c) 2018 Linaro Ltd. + * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> + */ + +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/gpio/driver.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pinctrl/machine.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinmux.h> +#include <linux/pinctrl/pinconf.h> +#include <linux/pinctrl/pinconf-generic.h> +#include <linux/slab.h> +#include <linux/spinlock.h> + +#include "../core.h" +#include "../pinctrl-utils.h" +#include "pinctrl-owl.h" + +/** + * 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 + */ +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; + void __iomem *base; +}; + +static void owl_update_bits(void __iomem *base, u32 mask, u32 val) +{ + u32 reg_val; + + reg_val = readl_relaxed(base); + + reg_val = (reg_val & ~mask) | (val & mask); + + writel_relaxed(reg_val, base); +} + +static u32 owl_read_field(struct owl_pinctrl *pctrl, u32 reg, + u32 bit, u32 width) +{ + u32 tmp, mask; + + tmp = readl_relaxed(pctrl->base + reg); + mask = (1 << width) - 1; + + return (tmp >> bit) & mask; +} + +static void owl_write_field(struct owl_pinctrl *pctrl, u32 reg, u32 arg, + u32 bit, u32 width) +{ + u32 mask; + + mask = (1 << width) - 1; + mask = mask << bit; + + owl_update_bits(pctrl->base + reg, mask, (arg << bit)); +} + +static int owl_get_groups_count(struct pinctrl_dev *pctrldev) +{ + struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); + + return pctrl->soc->ngroups; +} + +static const char *owl_get_group_name(struct pinctrl_dev *pctrldev, + unsigned int group) +{ + struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); + + return pctrl->soc->groups[group].name; +} + +static int owl_get_group_pins(struct pinctrl_dev *pctrldev, + unsigned int group, + const unsigned int **pins, + unsigned int *num_pins) +{ + struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); + + *pins = pctrl->soc->groups[group].pads; + *num_pins = pctrl->soc->groups[group].npads; + + return 0; +} + +static void owl_pin_dbg_show(struct pinctrl_dev *pctrldev, + struct seq_file *s, + unsigned int offset) +{ + struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); + + seq_printf(s, "%s", dev_name(pctrl->dev)); +} + +static struct pinctrl_ops owl_pinctrl_ops = { + .get_groups_count = owl_get_groups_count, + .get_group_name = owl_get_group_name, + .get_group_pins = owl_get_group_pins, + .pin_dbg_show = owl_pin_dbg_show, + .dt_node_to_map = pinconf_generic_dt_node_to_map_all, + .dt_free_map = pinctrl_utils_free_map, +}; + +static int owl_get_funcs_count(struct pinctrl_dev *pctrldev) +{ + struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); + + return pctrl->soc->nfunctions; +} + +static const char *owl_get_func_name(struct pinctrl_dev *pctrldev, + unsigned int function) +{ + struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); + + return pctrl->soc->functions[function].name; +} + +static int owl_get_func_groups(struct pinctrl_dev *pctrldev, + unsigned int function, + const char * const **groups, + unsigned int * const num_groups) +{ + struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); + + *groups = pctrl->soc->functions[function].groups; + *num_groups = pctrl->soc->functions[function].ngroups; + + return 0; +} + +static inline int get_group_mfp_mask_val(const struct owl_pingroup *g, + int function, + u32 *mask, + u32 *val) +{ + int id; + u32 option_num; + u32 option_mask; + + for (id = 0; id < g->nfuncs; id++) { + if (g->funcs[id] == function) + break; + } + if (WARN_ON(id == g->nfuncs)) + return -EINVAL; + + option_num = (1 << g->mfpctl_width); + if (id > option_num) + id -= option_num; + + option_mask = option_num - 1; + *mask = (option_mask << g->mfpctl_shift); + *val = (id << g->mfpctl_shift); + + return 0; +} + +static int owl_set_mux(struct pinctrl_dev *pctrldev, + unsigned int function, + unsigned int group) +{ + struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); + const struct owl_pingroup *g; + unsigned long flags; + u32 val, mask; + + g = &pctrl->soc->groups[group]; + + if (get_group_mfp_mask_val(g, function, &mask, &val)) + return -EINVAL; + + raw_spin_lock_irqsave(&pctrl->lock, flags); + + owl_update_bits(pctrl->base + g->mfpctl_reg, mask, val); + + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + + return 0; +} + +static struct pinmux_ops owl_pinmux_ops = { + .get_functions_count = owl_get_funcs_count, + .get_function_name = owl_get_func_name, + .get_function_groups = owl_get_func_groups, + .set_mux = owl_set_mux, +}; + +static int owl_pad_pinconf_reg(const struct owl_padinfo *info, + unsigned int param, + u32 *reg, + u32 *bit, + u32 *width) +{ + switch (param) { + case PIN_CONFIG_BIAS_BUS_HOLD: + case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: + case PIN_CONFIG_BIAS_PULL_DOWN: + case PIN_CONFIG_BIAS_PULL_UP: + if (!info->pullctl) + return -EINVAL; + *reg = info->pullctl->reg; + *bit = info->pullctl->shift; + *width = info->pullctl->width; + break; + case PIN_CONFIG_INPUT_SCHMITT_ENABLE: + if (!info->st) + return -EINVAL; + *reg = info->st->reg; + *bit = info->st->shift; + *width = info->st->width; + break; + default: + return -ENOTSUPP; + } + + return 0; +} + +static int owl_pad_pinconf_arg2val(const struct owl_padinfo *info, + unsigned int param, + u32 *arg) +{ + switch (param) { + case PIN_CONFIG_BIAS_BUS_HOLD: + *arg = OWL_PINCONF_PULL_HOLD; + break; + case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: + *arg = OWL_PINCONF_PULL_HIZ; + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + *arg = OWL_PINCONF_PULL_DOWN; + break; + case PIN_CONFIG_BIAS_PULL_UP: + *arg = OWL_PINCONF_PULL_UP; + break; + case PIN_CONFIG_INPUT_SCHMITT_ENABLE: + *arg = (*arg >= 1 ? 1 : 0); + break; + default: + return -ENOTSUPP; + } + + return 0; +} + +static int owl_pad_pinconf_val2arg(const struct owl_padinfo *padinfo, + unsigned int param, + u32 *arg) +{ + switch (param) { + case PIN_CONFIG_BIAS_BUS_HOLD: + *arg = *arg == OWL_PINCONF_PULL_HOLD; + break; + case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: + *arg = *arg == OWL_PINCONF_PULL_HIZ; + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + *arg = *arg == OWL_PINCONF_PULL_DOWN; + break; + case PIN_CONFIG_BIAS_PULL_UP: + *arg = *arg == OWL_PINCONF_PULL_UP; + break; + case PIN_CONFIG_INPUT_SCHMITT_ENABLE: + *arg = *arg == 1; + break; + default: + return -ENOTSUPP; + } + + return 0; +} + +static int owl_pin_config_get(struct pinctrl_dev *pctrldev, + unsigned int pin, + unsigned long *config) +{ + int ret = 0; + struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); + const struct owl_padinfo *info; + unsigned int param = pinconf_to_config_param(*config); + u32 reg, bit, width, arg; + + info = &pctrl->soc->padinfo[pin]; + + ret = owl_pad_pinconf_reg(info, param, ®, &bit, &width); + if (ret) + return ret; + + arg = owl_read_field(pctrl, reg, bit, width); + + ret = owl_pad_pinconf_val2arg(info, param, &arg); + if (ret) + return ret; + + *config = pinconf_to_config_packed(param, arg); + + return ret; +} + +static int owl_pin_config_set(struct pinctrl_dev *pctrldev, + unsigned int pin, + unsigned long *configs, + unsigned int num_configs) +{ + struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); + const struct owl_padinfo *info; + unsigned long flags; + unsigned int param; + u32 reg, bit, width, arg; + int ret, i; + + info = &pctrl->soc->padinfo[pin]; + + for (i = 0; i < num_configs; i++) { + param = pinconf_to_config_param(configs[i]); + arg = pinconf_to_config_argument(configs[i]); + + ret = owl_pad_pinconf_reg(info, param, ®, &bit, &width); + if (ret) + return ret; + + ret = owl_pad_pinconf_arg2val(info, param, &arg); + if (ret) + return ret; + + raw_spin_lock_irqsave(&pctrl->lock, flags); + + owl_write_field(pctrl, reg, arg, bit, width); + + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + } + + return ret; +} + +static int owl_group_pinconf_reg(const struct owl_pingroup *g, + unsigned int param, + u32 *reg, + u32 *bit, + u32 *width) +{ + switch (param) { + case PIN_CONFIG_DRIVE_STRENGTH: + if (g->drv_reg < 0) + return -EINVAL; + *reg = g->drv_reg; + *bit = g->drv_shift; + *width = g->drv_width; + break; + case PIN_CONFIG_SLEW_RATE: + if (g->sr_reg < 0) + return -EINVAL; + *reg = g->sr_reg; + *bit = g->sr_shift; + *width = g->sr_width; + break; + default: + return -ENOTSUPP; + } + + return 0; +} + +static int owl_group_pinconf_arg2val(const struct owl_pingroup *g, + unsigned int param, + u32 *arg) +{ + switch (param) { + case PIN_CONFIG_DRIVE_STRENGTH: + switch (*arg) { + case 2: + *arg = OWL_PINCONF_DRV_2MA; + break; + case 4: + *arg = OWL_PINCONF_DRV_4MA; + break; + case 8: + *arg = OWL_PINCONF_DRV_8MA; + break; + case 12: + *arg = OWL_PINCONF_DRV_12MA; + break; + default: + return -EINVAL; + } + break; + case PIN_CONFIG_SLEW_RATE: + if (*arg) + *arg = OWL_PINCONF_SLEW_FAST; + else + *arg = OWL_PINCONF_SLEW_SLOW; + break; + default: + return -ENOTSUPP; + } + + return 0; +} + +static int owl_group_pinconf_val2arg(const struct owl_pingroup *g, + unsigned int param, + u32 *arg) +{ + switch (param) { + case PIN_CONFIG_DRIVE_STRENGTH: + switch (*arg) { + case OWL_PINCONF_DRV_2MA: + *arg = 2; + break; + case OWL_PINCONF_DRV_4MA: + *arg = 4; + break; + case OWL_PINCONF_DRV_8MA: + *arg = 8; + break; + case OWL_PINCONF_DRV_12MA: + *arg = 12; + break; + default: + return -EINVAL; + } + break; + case PIN_CONFIG_SLEW_RATE: + if (*arg) + *arg = 1; + else + *arg = 0; + break; + default: + return -ENOTSUPP; + } + + return 0; +} + +static int owl_group_config_get(struct pinctrl_dev *pctrldev, + unsigned int group, + unsigned long *config) +{ + const struct owl_pingroup *g; + struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); + unsigned int param = pinconf_to_config_param(*config); + u32 reg, bit, width, arg; + int ret; + + g = &pctrl->soc->groups[group]; + + ret = owl_group_pinconf_reg(g, param, ®, &bit, &width); + if (ret) + return ret; + + arg = owl_read_field(pctrl, reg, bit, width); + + ret = owl_group_pinconf_val2arg(g, param, &arg); + if (ret) + return ret; + + *config = pinconf_to_config_packed(param, arg); + + return ret; + +} + +static int owl_group_config_set(struct pinctrl_dev *pctrldev, + unsigned int group, + unsigned long *configs, + unsigned int num_configs) +{ + const struct owl_pingroup *g; + struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); + unsigned long flags; + unsigned int param; + u32 reg, bit, width, arg; + int ret, i; + + g = &pctrl->soc->groups[group]; + + for (i = 0; i < num_configs; i++) { + param = pinconf_to_config_param(configs[i]); + arg = pinconf_to_config_argument(configs[i]); + + ret = owl_group_pinconf_reg(g, param, ®, &bit, &width); + if (ret) + return ret; + + ret = owl_group_pinconf_arg2val(g, param, &arg); + if (ret) + return ret; + + /* Update register */ + raw_spin_lock_irqsave(&pctrl->lock, flags); + + owl_write_field(pctrl, reg, arg, bit, width); + + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + } + + return 0; +} + +static const struct pinconf_ops owl_pinconf_ops = { + .is_generic = true, + .pin_config_get = owl_pin_config_get, + .pin_config_set = owl_pin_config_set, + .pin_config_group_get = owl_group_config_get, + .pin_config_group_set = owl_group_config_set, +}; + +static struct pinctrl_desc owl_pinctrl_desc = { + .pctlops = &owl_pinctrl_ops, + .pmxops = &owl_pinmux_ops, + .confops = &owl_pinconf_ops, + .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) +{ + struct resource *res; + struct owl_pinctrl *pctrl; + int ret; + + pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL); + if (!pctrl) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + pctrl->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(pctrl->base)) + return PTR_ERR(pctrl->base); + + /* enable GPIO/MFP clock */ + pctrl->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(pctrl->clk)) { + dev_err(&pdev->dev, "no clock defined\n"); + return PTR_ERR(pctrl->clk); + } + + ret = clk_prepare_enable(pctrl->clk); + if (ret) { + dev_err(&pdev->dev, "clk enable failed\n"); + return ret; + } + + raw_spin_lock_init(&pctrl->lock); + + owl_pinctrl_desc.name = dev_name(&pdev->dev); + 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; + + pctrl->pctrldev = devm_pinctrl_register(&pdev->dev, + &owl_pinctrl_desc, pctrl); + if (IS_ERR(pctrl->pctrldev)) { + dev_err(&pdev->dev, "could not register Actions OWL pinmux driver\n"); + return PTR_ERR(pctrl->pctrldev); + } + + ret = owl_gpio_init(pctrl); + if (ret) + return ret; + + platform_set_drvdata(pdev, pctrl); + + return 0; +} |
