diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/pinctrl/pinctrl-equilibrium.c | 960 |
1 files changed, 960 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-equilibrium.c b/drivers/pinctrl/pinctrl-equilibrium.c new file mode 100644 index 000000000..99cf24eb6 --- /dev/null +++ b/drivers/pinctrl/pinctrl-equilibrium.c @@ -0,0 +1,960 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2019 Intel Corporation */ + +#include <linux/gpio/driver.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinconf.h> +#include <linux/pinctrl/pinconf-generic.h> +#include <linux/pinctrl/pinmux.h> +#include <linux/platform_device.h> +#include <linux/property.h> + +#include "core.h" +#include "pinconf.h" +#include "pinmux.h" +#include "pinctrl-equilibrium.h" + +#define PIN_NAME_FMT "io-%d" +#define PIN_NAME_LEN 10 +#define PAD_REG_OFF 0x100 + +static void eqbr_gpio_disable_irq(struct irq_data *d) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct eqbr_gpio_ctrl *gctrl = gpiochip_get_data(gc); + unsigned int offset = irqd_to_hwirq(d); + unsigned long flags; + + raw_spin_lock_irqsave(&gctrl->lock, flags); + writel(BIT(offset), gctrl->membase + GPIO_IRNENCLR); + raw_spin_unlock_irqrestore(&gctrl->lock, flags); +} + +static void eqbr_gpio_enable_irq(struct irq_data *d) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct eqbr_gpio_ctrl *gctrl = gpiochip_get_data(gc); + unsigned int offset = irqd_to_hwirq(d); + unsigned long flags; + + gc->direction_input(gc, offset); + raw_spin_lock_irqsave(&gctrl->lock, flags); + writel(BIT(offset), gctrl->membase + GPIO_IRNRNSET); + raw_spin_unlock_irqrestore(&gctrl->lock, flags); +} + +static void eqbr_gpio_ack_irq(struct irq_data *d) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct eqbr_gpio_ctrl *gctrl = gpiochip_get_data(gc); + unsigned int offset = irqd_to_hwirq(d); + unsigned long flags; + + raw_spin_lock_irqsave(&gctrl->lock, flags); + writel(BIT(offset), gctrl->membase + GPIO_IRNCR); + raw_spin_unlock_irqrestore(&gctrl->lock, flags); +} + +static void eqbr_gpio_mask_ack_irq(struct irq_data *d) +{ + eqbr_gpio_disable_irq(d); + eqbr_gpio_ack_irq(d); +} + +static inline void eqbr_cfg_bit(void __iomem *addr, + unsigned int offset, unsigned int set) +{ + if (set) + writel(readl(addr) | BIT(offset), addr); + else + writel(readl(addr) & ~BIT(offset), addr); +} + +static int eqbr_irq_type_cfg(struct gpio_irq_type *type, + struct eqbr_gpio_ctrl *gctrl, + unsigned int offset) +{ + unsigned long flags; + + raw_spin_lock_irqsave(&gctrl->lock, flags); + eqbr_cfg_bit(gctrl->membase + GPIO_IRNCFG, offset, type->trig_type); + eqbr_cfg_bit(gctrl->membase + GPIO_EXINTCR1, offset, type->trig_type); + eqbr_cfg_bit(gctrl->membase + GPIO_EXINTCR0, offset, type->logic_type); + raw_spin_unlock_irqrestore(&gctrl->lock, flags); + + return 0; +} + +static int eqbr_gpio_set_irq_type(struct irq_data *d, unsigned int type) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct eqbr_gpio_ctrl *gctrl = gpiochip_get_data(gc); + unsigned int offset = irqd_to_hwirq(d); + struct gpio_irq_type it; + + memset(&it, 0, sizeof(it)); + + if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_NONE) + return 0; + + switch (type) { + case IRQ_TYPE_EDGE_RISING: + it.trig_type = GPIO_EDGE_TRIG; + it.edge_type = GPIO_SINGLE_EDGE; + it.logic_type = GPIO_POSITIVE_TRIG; + break; + + case IRQ_TYPE_EDGE_FALLING: + it.trig_type = GPIO_EDGE_TRIG; + it.edge_type = GPIO_SINGLE_EDGE; + it.logic_type = GPIO_NEGATIVE_TRIG; + break; + + case IRQ_TYPE_EDGE_BOTH: + it.trig_type = GPIO_EDGE_TRIG; + it.edge_type = GPIO_BOTH_EDGE; + it.logic_type = GPIO_POSITIVE_TRIG; + break; + + case IRQ_TYPE_LEVEL_HIGH: + it.trig_type = GPIO_LEVEL_TRIG; + it.edge_type = GPIO_SINGLE_EDGE; + it.logic_type = GPIO_POSITIVE_TRIG; + break; + + case IRQ_TYPE_LEVEL_LOW: + it.trig_type = GPIO_LEVEL_TRIG; + it.edge_type = GPIO_SINGLE_EDGE; + it.logic_type = GPIO_NEGATIVE_TRIG; + break; + + default: + return -EINVAL; + } + + eqbr_irq_type_cfg(&it, gctrl, offset); + if (it.trig_type == GPIO_EDGE_TRIG) + irq_set_handler_locked(d, handle_edge_irq); + else + irq_set_handler_locked(d, handle_level_irq); + + return 0; +} + +static void eqbr_irq_handler(struct irq_desc *desc) +{ + struct gpio_chip *gc = irq_desc_get_handler_data(desc); + struct eqbr_gpio_ctrl *gctrl = gpiochip_get_data(gc); + struct irq_chip *ic = irq_desc_get_chip(desc); + unsigned long pins, offset; + + chained_irq_enter(ic, desc); + pins = readl(gctrl->membase + GPIO_IRNCR); + + for_each_set_bit(offset, &pins, gc->ngpio) + generic_handle_domain_irq(gc->irq.domain, offset); + + chained_irq_exit(ic, desc); +} + +static int gpiochip_setup(struct device *dev, struct eqbr_gpio_ctrl *gctrl) +{ + struct gpio_irq_chip *girq; + struct gpio_chip *gc; + + gc = &gctrl->chip; + gc->label = gctrl->name; + gc->fwnode = gctrl->fwnode; + + if (!fwnode_property_read_bool(gctrl->fwnode, "interrupt-controller")) { + dev_dbg(dev, "gc %s: doesn't act as interrupt controller!\n", + gctrl->name); + return 0; + } + + gctrl->ic.name = "gpio_irq"; + gctrl->ic.irq_mask = eqbr_gpio_disable_irq; + gctrl->ic.irq_unmask = eqbr_gpio_enable_irq; + gctrl->ic.irq_ack = eqbr_gpio_ack_irq; + gctrl->ic.irq_mask_ack = eqbr_gpio_mask_ack_irq; + gctrl->ic.irq_set_type = eqbr_gpio_set_irq_type; + + girq = &gctrl->chip.irq; + girq->chip = &gctrl->ic; + girq->parent_handler = eqbr_irq_handler; + girq->num_parents = 1; + girq->parents = devm_kcalloc(dev, 1, sizeof(*girq->parents), GFP_KERNEL); + if (!girq->parents) + return -ENOMEM; + + girq->default_type = IRQ_TYPE_NONE; + girq->handler = handle_bad_irq; + girq->parents[0] = gctrl->virq; + + return 0; +} + +static int gpiolib_reg(struct eqbr_pinctrl_drv_data *drvdata) +{ + struct device *dev = drvdata->dev; + struct eqbr_gpio_ctrl *gctrl; + struct device_node *np; + struct resource res; + int i, ret; + + for (i = 0; i < drvdata->nr_gpio_ctrls; i++) { + gctrl = drvdata->gpio_ctrls + i; + np = to_of_node(gctrl->fwnode); + + gctrl->name = devm_kasprintf(dev, GFP_KERNEL, "gpiochip%d", i); + if (!gctrl->name) + return -ENOMEM; + + if (of_address_to_resource(np, 0, &res)) { + dev_err(dev, "Failed to get GPIO register address\n"); + return -ENXIO; + } + + gctrl->membase = devm_ioremap_resource(dev, &res); + if (IS_ERR(gctrl->membase)) + return PTR_ERR(gctrl->membase); + + gctrl->virq = irq_of_parse_and_map(np, 0); + if (!gctrl->virq) { + dev_err(dev, "%s: failed to parse and map irq\n", + gctrl->name); + return -ENXIO; + } + raw_spin_lock_init(&gctrl->lock); + + ret = bgpio_init(&gctrl->chip, dev, gctrl->bank->nr_pins / 8, + gctrl->membase + GPIO_IN, + gctrl->membase + GPIO_OUTSET, + gctrl->membase + GPIO_OUTCLR, + gctrl->membase + GPIO_DIR, + NULL, 0); + if (ret) { + dev_err(dev, "unable to init generic GPIO\n"); + return ret; + } + + ret = gpiochip_setup(dev, gctrl); + if (ret) + return ret; + + ret = devm_gpiochip_add_data(dev, &gctrl->chip, gctrl); + if (ret) + return ret; + } + + return 0; +} + +static inline struct eqbr_pin_bank +*find_pinbank_via_pin(struct eqbr_pinctrl_drv_data *pctl, unsigned int pin) +{ + struct eqbr_pin_bank *bank; + int i; + + for (i = 0; i < pctl->nr_banks; i++) { + bank = &pctl->pin_banks[i]; + if (pin >= bank->pin_base && + (pin - bank->pin_base) < bank->nr_pins) + return bank; + } + + return NULL; +} + +static const struct pinctrl_ops eqbr_pctl_ops = { + .get_groups_count = pinctrl_generic_get_group_count, + .get_group_name = pinctrl_generic_get_group_name, + .get_group_pins = pinctrl_generic_get_group_pins, + .dt_node_to_map = pinconf_generic_dt_node_to_map_all, + .dt_free_map = pinconf_generic_dt_free_map, +}; + +static int eqbr_set_pin_mux(struct eqbr_pinctrl_drv_data *pctl, + unsigned int pmx, unsigned int pin) +{ + struct eqbr_pin_bank *bank; + unsigned long flags; + unsigned int offset; + void __iomem *mem; + + bank = find_pinbank_via_pin(pctl, pin); + if (!bank) { + dev_err(pctl->dev, "Couldn't find pin bank for pin %u\n", pin); + return -ENODEV; + } + mem = bank->membase; + offset = pin - bank->pin_base; + + if (!(bank->aval_pinmap & BIT(offset))) { + dev_err(pctl->dev, + "PIN: %u is not valid, pinbase: %u, bitmap: %u\n", + pin, bank->pin_base, bank->aval_pinmap); + return -ENODEV; + } + + raw_spin_lock_irqsave(&pctl->lock, flags); + writel(pmx, mem + (offset * 4)); + raw_spin_unlock_irqrestore(&pctl->lock, flags); + return 0; +} + +static int eqbr_pinmux_set_mux(struct pinctrl_dev *pctldev, + unsigned int selector, unsigned int group) +{ + struct eqbr_pinctrl_drv_data *pctl = pinctrl_dev_get_drvdata(pctldev); + struct function_desc *func; + struct group_desc *grp; + unsigned int *pinmux; + int i; + + func = pinmux_generic_get_function(pctldev, selector); + if (!func) + return -EINVAL; + + grp = pinctrl_generic_get_group(pctldev, group); + if (!grp) + return -EINVAL; + + pinmux = grp->data; + for (i = 0; i < grp->num_pins; i++) + eqbr_set_pin_mux(pctl, pinmux[i], grp->pins[i]); + + return 0; +} + +static int eqbr_pinmux_gpio_request(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned int pin) +{ + struct eqbr_pinctrl_drv_data *pctl = pinctrl_dev_get_drvdata(pctldev); + + return eqbr_set_pin_mux(pctl, EQBR_GPIO_MODE, pin); +} + +static const struct pinmux_ops eqbr_pinmux_ops = { + .get_functions_count = pinmux_generic_get_function_count, + .get_function_name = pinmux_generic_get_function_name, + .get_function_groups = pinmux_generic_get_function_groups, + .set_mux = eqbr_pinmux_set_mux, + .gpio_request_enable = eqbr_pinmux_gpio_request, + .strict = true, +}; + +static int get_drv_cur(void __iomem *mem, unsigned int offset) +{ + unsigned int idx = offset / DRV_CUR_PINS; /* 0-15, 16-31 per register*/ + unsigned int pin_offset = offset % DRV_CUR_PINS; + + return PARSE_DRV_CURRENT(readl(mem + REG_DRCC(idx)), pin_offset); +} + +static struct eqbr_gpio_ctrl +*get_gpio_ctrls_via_bank(struct eqbr_pinctrl_drv_data *pctl, + struct eqbr_pin_bank *bank) +{ + int i; + + for (i = 0; i < pctl->nr_gpio_ctrls; i++) { + if (pctl->gpio_ctrls[i].bank == bank) + return &pctl->gpio_ctrls[i]; + } + + return NULL; +} + +static int eqbr_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin, + unsigned long *config) +{ + struct eqbr_pinctrl_drv_data *pctl = pinctrl_dev_get_drvdata(pctldev); + enum pin_config_param param = pinconf_to_config_param(*config); + struct eqbr_gpio_ctrl *gctrl; + struct eqbr_pin_bank *bank; + unsigned long flags; + unsigned int offset; + void __iomem *mem; + u32 val; + + bank = find_pinbank_via_pin(pctl, pin); + if (!bank) { + dev_err(pctl->dev, "Couldn't find pin bank for pin %u\n", pin); + return -ENODEV; + } + mem = bank->membase; + offset = pin - bank->pin_base; + + if (!(bank->aval_pinmap & BIT(offset))) { + dev_err(pctl->dev, + "PIN: %u is not valid, pinbase: %u, bitmap: %u\n", + pin, bank->pin_base, bank->aval_pinmap); + return -ENODEV; + } + + raw_spin_lock_irqsave(&pctl->lock, flags); + switch (param) { + case PIN_CONFIG_BIAS_PULL_UP: + val = !!(readl(mem + REG_PUEN) & BIT(offset)); + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + val = !!(readl(mem + REG_PDEN) & BIT(offset)); + break; + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + val = !!(readl(mem + REG_OD) & BIT(offset)); + break; + case PIN_CONFIG_DRIVE_STRENGTH: + val = get_drv_cur(mem, offset); + break; + case PIN_CONFIG_SLEW_RATE: + val = !!(readl(mem + REG_SRC) & BIT(offset)); + break; + case PIN_CONFIG_OUTPUT_ENABLE: + gctrl = get_gpio_ctrls_via_bank(pctl, bank); + if (!gctrl) { + dev_err(pctl->dev, "Failed to find gpio via bank pinbase: %u, pin: %u\n", + bank->pin_base, pin); + raw_spin_unlock_irqrestore(&pctl->lock, flags); + return -ENODEV; + } + val = !!(readl(gctrl->membase + GPIO_DIR) & BIT(offset)); + break; + default: + raw_spin_unlock_irqrestore(&pctl->lock, flags); + return -ENOTSUPP; + } + raw_spin_unlock_irqrestore(&pctl->lock, flags); + *config = pinconf_to_config_packed(param, val); +; + return 0; +} + +static int eqbr_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin, + unsigned long *configs, unsigned int num_configs) +{ + struct eqbr_pinctrl_drv_data *pctl = pinctrl_dev_get_drvdata(pctldev); + struct eqbr_gpio_ctrl *gctrl; + enum pin_config_param param; + struct eqbr_pin_bank *bank; + unsigned int val, offset; + struct gpio_chip *gc; + unsigned long flags; + void __iomem *mem; + u32 regval, mask; + int i; + + for (i = 0; i < num_configs; i++) { + param = pinconf_to_config_param(configs[i]); + val = pinconf_to_config_argument(configs[i]); + + bank = find_pinbank_via_pin(pctl, pin); + if (!bank) { + dev_err(pctl->dev, + "Couldn't find pin bank for pin %u\n", pin); + return -ENODEV; + } + mem = bank->membase; + offset = pin - bank->pin_base; + + switch (param) { + case PIN_CONFIG_BIAS_PULL_UP: + mem += REG_PUEN; + mask = BIT(offset); + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + mem += REG_PDEN; + mask = BIT(offset); + break; + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + mem += REG_OD; + mask = BIT(offset); + break; + case PIN_CONFIG_DRIVE_STRENGTH: + mem += REG_DRCC(offset / DRV_CUR_PINS); + offset = (offset % DRV_CUR_PINS) * 2; + mask = GENMASK(1, 0) << offset; + break; + case PIN_CONFIG_SLEW_RATE: + mem += REG_SRC; + mask = BIT(offset); + break; + case PIN_CONFIG_OUTPUT_ENABLE: + gctrl = get_gpio_ctrls_via_bank(pctl, bank); + if (!gctrl) { + dev_err(pctl->dev, "Failed to find gpio via bank pinbase: %u, pin: %u\n", + bank->pin_base, pin); + return -ENODEV; + } + gc = &gctrl->chip; + gc->direction_output(gc, offset, 0); + continue; + default: + return -ENOTSUPP; + } + + raw_spin_lock_irqsave(&pctl->lock, flags); + regval = readl(mem); + regval = (regval & ~mask) | ((val << offset) & mask); + writel(regval, mem); + raw_spin_unlock_irqrestore(&pctl->lock, flags); + } + + return 0; +} + +static int eqbr_pinconf_group_get(struct pinctrl_dev *pctldev, + unsigned int group, unsigned long *config) +{ + unsigned int i, npins, old = 0; + const unsigned int *pins; + int ret; + + ret = pinctrl_generic_get_group_pins(pctldev, group, &pins, &npins); + if (ret) + return ret; + + for (i = 0; i < npins; i++) { + if (eqbr_pinconf_get(pctldev, pins[i], config)) + return -ENOTSUPP; + + if (i && old != *config) + return -ENOTSUPP; + + old = *config; + } + return 0; +} + +static int eqbr_pinconf_group_set(struct pinctrl_dev *pctldev, + unsigned int group, unsigned long *configs, + unsigned int num_configs) +{ + const unsigned int *pins; + unsigned int i, npins; + int ret; + + ret = pinctrl_generic_get_group_pins(pctldev, group, &pins, &npins); + if (ret) + return ret; + + for (i = 0; i < npins; i++) { + ret = eqbr_pinconf_set(pctldev, pins[i], configs, num_configs); + if (ret) + return ret; + } + return 0; +} + +static const struct pinconf_ops eqbr_pinconf_ops = { + .is_generic = true, + .pin_config_get = eqbr_pinconf_get, + .pin_config_set = eqbr_pinconf_set, + .pin_config_group_get = eqbr_pinconf_group_get, + .pin_config_group_set = eqbr_pinconf_group_set, + .pin_config_config_dbg_show = pinconf_generic_dump_config, +}; + +static bool is_func_exist(struct eqbr_pmx_func *funcs, const char *name, + unsigned int nr_funcs, unsigned int *idx) +{ + int i; + + if (!funcs) + return false; + + for (i = 0; i < nr_funcs; i++) { + if (funcs[i].name && !strcmp(funcs[i].name, name)) { + *idx = i; + return true; + } + } + + return false; +} + +static int funcs_utils(struct device *dev, struct eqbr_pmx_func *funcs, + unsigned int *nr_funcs, funcs_util_ops op) +{ + struct device_node *node = dev->of_node; + struct device_node *np; + struct property *prop; + const char *fn_name; + unsigned int fid; + int i, j; + + i = 0; + for_each_child_of_node(node, np) { + prop = of_find_property(np, "groups", NULL); + if (!prop) + continue; + + if (of_property_read_string(np, "function", &fn_name)) { + /* some groups may not have function, it's OK */ + dev_dbg(dev, "Group %s: not function binded!\n", + (char *)prop->value); + continue; + } + + switch (op) { + case OP_COUNT_NR_FUNCS: + if (!is_func_exist(funcs, fn_name, *nr_funcs, &fid)) + *nr_funcs = *nr_funcs + 1; + break; + + case OP_ADD_FUNCS: + if (!is_func_exist(funcs, fn_name, *nr_funcs, &fid)) + funcs[i].name = fn_name; + break; + + case OP_COUNT_NR_FUNC_GRPS: + if (is_func_exist(funcs, fn_name, *nr_funcs, &fid)) + funcs[fid].nr_groups++; + break; + + case OP_ADD_FUNC_GRPS: + if (is_func_exist(funcs, fn_name, *nr_funcs, &fid)) { + for (j = 0; j < funcs[fid].nr_groups; j++) + if (!funcs[fid].groups[j]) + break; + funcs[fid].groups[j] = prop->value; + } + break; + + default: + of_node_put(np); + return -EINVAL; + } + i++; + } + + return 0; +} + +static int eqbr_build_functions(struct eqbr_pinctrl_drv_data *drvdata) +{ + struct device *dev = drvdata->dev; + struct eqbr_pmx_func *funcs = NULL; + unsigned int nr_funcs = 0; + int i, ret; + + ret = funcs_utils(dev, funcs, &nr_funcs, OP_COUNT_NR_FUNCS); + if (ret) + return ret; + + funcs = devm_kcalloc(dev, nr_funcs, sizeof(*funcs), GFP_KERNEL); + if (!funcs) + return -ENOMEM; + + ret = funcs_utils(dev, funcs, &nr_funcs, OP_ADD_FUNCS); + if (ret) + return ret; + + ret = funcs_utils(dev, funcs, &nr_funcs, OP_COUNT_NR_FUNC_GRPS); + if (ret) + return ret; + + for (i = 0; i < nr_funcs; i++) { + if (!funcs[i].nr_groups) + continue; + funcs[i].groups = devm_kcalloc(dev, funcs[i].nr_groups, + sizeof(*(funcs[i].groups)), + GFP_KERNEL); + if (!funcs[i].groups) + return -ENOMEM; + } + + ret = funcs_utils(dev, funcs, &nr_funcs, OP_ADD_FUNC_GRPS); + if (ret) + return ret; + + for (i = 0; i < nr_funcs; i++) { + + /* Ignore the same function with multiple groups */ + if (funcs[i].name == NULL) + continue; + + ret = pinmux_generic_add_function(drvdata->pctl_dev, + funcs[i].name, + funcs[i].groups, + funcs[i].nr_groups, + drvdata); + if (ret < 0) { + dev_err(dev, "Failed to register function %s\n", + funcs[i].name); + return ret; + } + } + + return 0; +} + +static int eqbr_build_groups(struct eqbr_pinctrl_drv_data *drvdata) +{ + struct device *dev = drvdata->dev; + struct device_node *node = dev->of_node; + unsigned int *pinmux, pin_id, pinmux_id; + struct group_desc group; + struct device_node *np; + struct property *prop; + int j, err; + + for_each_child_of_node(node, np) { + prop = of_find_property(np, "groups", NULL); + if (!prop) + continue; + + group.num_pins = of_property_count_u32_elems(np, "pins"); + if (group.num_pins < 0) { + dev_err(dev, "No pins in the group: %s\n", prop->name); + of_node_put(np); + return -EINVAL; + } + group.name = prop->value; + group.pins = devm_kcalloc(dev, group.num_pins, + sizeof(*(group.pins)), GFP_KERNEL); + if (!group.pins) { + of_node_put(np); + return -ENOMEM; + } + + pinmux = devm_kcalloc(dev, group.num_pins, sizeof(*pinmux), + GFP_KERNEL); + if (!pinmux) { + of_node_put(np); + return -ENOMEM; + } + + for (j = 0; j < group.num_pins; j++) { + if (of_property_read_u32_index(np, "pins", j, &pin_id)) { + dev_err(dev, "Group %s: Read intel pins id failed\n", + group.name); + of_node_put(np); + return -EINVAL; + } + if (pin_id >= drvdata->pctl_desc.npins) { + dev_err(dev, "Group %s: Invalid pin ID, idx: %d, pin %u\n", + group.name, j, pin_id); + of_node_put(np); + return -EINVAL; + } + group.pins[j] = pin_id; + if (of_property_read_u32_index(np, "pinmux", j, &pinmux_id)) { + dev_err(dev, "Group %s: Read intel pinmux id failed\n", + group.name); + of_node_put(np); + return -EINVAL; + } + pinmux[j] = pinmux_id; + } + + err = pinctrl_generic_add_group(drvdata->pctl_dev, group.name, + group.pins, group.num_pins, + pinmux); + if (err < 0) { + dev_err(dev, "Failed to register group %s\n", group.name); + of_node_put(np); + return err; + } + memset(&group, 0, sizeof(group)); + pinmux = NULL; + } + + return 0; +} + +static int pinctrl_reg(struct eqbr_pinctrl_drv_data *drvdata) +{ + struct pinctrl_desc *pctl_desc; + struct pinctrl_pin_desc *pdesc; + struct device *dev; + unsigned int nr_pins; + char *pin_names; + int i, ret; + + dev = drvdata->dev; + pctl_desc = &drvdata->pctl_desc; + pctl_desc->name = "eqbr-pinctrl"; + pctl_desc->owner = THIS_MODULE; + pctl_desc->pctlops = &eqbr_pctl_ops; + pctl_desc->pmxops = &eqbr_pinmux_ops; + pctl_desc->confops = &eqbr_pinconf_ops; + raw_spin_lock_init(&drvdata->lock); + + for (i = 0, nr_pins = 0; i < drvdata->nr_banks; i++) + nr_pins += drvdata->pin_banks[i].nr_pins; + + pdesc = devm_kcalloc(dev, nr_pins, sizeof(*pdesc), GFP_KERNEL); + if (!pdesc) + return -ENOMEM; + pin_names = devm_kcalloc(dev, nr_pins, PIN_NAME_LEN, GFP_KERNEL); + if (!pin_names) + return -ENOMEM; + + for (i = 0; i < nr_pins; i++) { + sprintf(pin_names, PIN_NAME_FMT, i); + pdesc[i].number = i; + pdesc[i].name = pin_names; + pin_names += PIN_NAME_LEN; + } + pctl_desc->pins = pdesc; + pctl_desc->npins = nr_pins; + dev_dbg(dev, "pinctrl total pin number: %u\n", nr_pins); + + ret = devm_pinctrl_register_and_init(dev, pctl_desc, drvdata, + &drvdata->pctl_dev); + if (ret) + return ret; + + ret = eqbr_build_groups(drvdata); + if (ret) { + dev_err(dev, "Failed to build groups\n"); + return ret; + } + + ret = eqbr_build_functions(drvdata); + if (ret) { + dev_err(dev, "Failed to build functions\n"); + return ret; + } + + return pinctrl_enable(drvdata->pctl_dev); +} + +static int pinbank_init(struct device_node *np, + struct eqbr_pinctrl_drv_data *drvdata, + struct eqbr_pin_bank *bank, unsigned int id) +{ + struct device *dev = drvdata->dev; + struct of_phandle_args spec; + int ret; + + bank->membase = drvdata->membase + id * PAD_REG_OFF; + + ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &spec); + if (ret) { + dev_err(dev, "gpio-range not available!\n"); + return ret; + } + + bank->pin_base = spec.args[1]; + bank->nr_pins = spec.args[2]; + + bank->aval_pinmap = readl(bank->membase + REG_AVAIL); + bank->id = id; + + dev_dbg(dev, "pinbank id: %d, reg: %px, pinbase: %u, pin number: %u, pinmap: 0x%x\n", + id, bank->membase, bank->pin_base, + bank->nr_pins, bank->aval_pinmap); + + return ret; +} + +static int pinbank_probe(struct eqbr_pinctrl_drv_data *drvdata) +{ + struct device *dev = drvdata->dev; + struct device_node *np_gpio; + struct eqbr_gpio_ctrl *gctrls; + struct eqbr_pin_bank *banks; + int i, nr_gpio; + + /* Count gpio bank number */ + nr_gpio = 0; + for_each_node_by_name(np_gpio, "gpio") { + if (of_device_is_available(np_gpio)) + nr_gpio++; + } + + if (!nr_gpio) { + dev_err(dev, "NO pin bank available!\n"); + return -ENODEV; + } + + /* Count pin bank number and gpio controller number */ + banks = devm_kcalloc(dev, nr_gpio, sizeof(*banks), GFP_KERNEL); + if (!banks) + return -ENOMEM; + + gctrls = devm_kcalloc(dev, nr_gpio, sizeof(*gctrls), GFP_KERNEL); + if (!gctrls) + return -ENOMEM; + + dev_dbg(dev, "found %d gpio controller!\n", nr_gpio); + + /* Initialize Pin bank */ + i = 0; + for_each_node_by_name(np_gpio, "gpio") { + if (!of_device_is_available(np_gpio)) + continue; + + pinbank_init(np_gpio, drvdata, banks + i, i); + + gctrls[i].fwnode = of_fwnode_handle(np_gpio); + gctrls[i].bank = banks + i; + i++; + } + + drvdata->pin_banks = banks; + drvdata->nr_banks = nr_gpio; + drvdata->gpio_ctrls = gctrls; + drvdata->nr_gpio_ctrls = nr_gpio; + + return 0; +} + +static int eqbr_pinctrl_probe(struct platform_device *pdev) +{ + struct eqbr_pinctrl_drv_data *drvdata; + struct device *dev = &pdev->dev; + int ret; + + drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + drvdata->dev = dev; + + drvdata->membase = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(drvdata->membase)) + return PTR_ERR(drvdata->membase); + + ret = pinbank_probe(drvdata); + if (ret) + return ret; + + ret = pinctrl_reg(drvdata); + if (ret) + return ret; + + ret = gpiolib_reg(drvdata); + if (ret) + return ret; + + platform_set_drvdata(pdev, drvdata); + return 0; +} + +static const struct of_device_id eqbr_pinctrl_dt_match[] = { + { .compatible = "intel,lgm-io" }, + {} +}; +MODULE_DEVICE_TABLE(of, eqbr_pinctrl_dt_match); + +static struct platform_driver eqbr_pinctrl_driver = { + .probe = eqbr_pinctrl_probe, + .driver = { + .name = "eqbr-pinctrl", + .of_match_table = eqbr_pinctrl_dt_match, + }, +}; + +module_platform_driver(eqbr_pinctrl_driver); + +MODULE_AUTHOR("Zhu Yixin <yixin.zhu@intel.com>, Rahul Tanwar <rahul.tanwar@intel.com>"); +MODULE_DESCRIPTION("Pinctrl Driver for LGM SoC (Equilibrium)"); +MODULE_LICENSE("GPL v2"); |