diff options
Diffstat (limited to 'drivers/pinctrl/mediatek/pinctrl-mtk-common.c')
| -rw-r--r-- | drivers/pinctrl/mediatek/pinctrl-mtk-common.c | 553 |
1 files changed, 553 insertions, 0 deletions
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c new file mode 100644 index 0000000000..938cc75496 --- /dev/null +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c @@ -0,0 +1,553 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2018 MediaTek Inc. + * Author: Ryder Lee <ryder.lee@mediatek.com> + */ + +#include <common.h> +#include <dm.h> +#include <dm/device-internal.h> +#include <dm/lists.h> +#include <dm/pinctrl.h> +#include <asm/io.h> +#include <asm-generic/gpio.h> + +#include "pinctrl-mtk-common.h" + +/** + * struct mtk_drive_desc - the structure that holds the information + * of the driving current + * @min: the minimum current of this group + * @max: the maximum current of this group + * @step: the step current of this group + * @scal: the weight factor + * + * formula: output = ((input) / step - 1) * scal + */ +struct mtk_drive_desc { + u8 min; + u8 max; + u8 step; + u8 scal; +}; + +/* The groups of drive strength */ +static const struct mtk_drive_desc mtk_drive[] = { + [DRV_GRP0] = { 4, 16, 4, 1 }, + [DRV_GRP1] = { 4, 16, 4, 2 }, + [DRV_GRP2] = { 2, 8, 2, 1 }, + [DRV_GRP3] = { 2, 8, 2, 2 }, + [DRV_GRP4] = { 2, 16, 2, 1 }, +}; + +static const char *mtk_pinctrl_dummy_name = "_dummy"; + +static void mtk_w32(struct udevice *dev, u32 reg, u32 val) +{ + struct mtk_pinctrl_priv *priv = dev_get_priv(dev); + + __raw_writel(val, priv->base + reg); +} + +static u32 mtk_r32(struct udevice *dev, u32 reg) +{ + struct mtk_pinctrl_priv *priv = dev_get_priv(dev); + + return __raw_readl(priv->base + reg); +} + +static inline int get_count_order(unsigned int count) +{ + int order; + + order = fls(count) - 1; + if (count & (count - 1)) + order++; + return order; +} + +void mtk_rmw(struct udevice *dev, u32 reg, u32 mask, u32 set) +{ + u32 val; + + val = mtk_r32(dev, reg); + val &= ~mask; + val |= set; + mtk_w32(dev, reg, val); +} + +static int mtk_hw_pin_field_lookup(struct udevice *dev, int pin, + const struct mtk_pin_reg_calc *rc, + struct mtk_pin_field *pfd) +{ + const struct mtk_pin_field_calc *c, *e; + u32 bits; + + c = rc->range; + e = c + rc->nranges; + + while (c < e) { + if (pin >= c->s_pin && pin <= c->e_pin) + break; + c++; + } + + if (c >= e) + return -EINVAL; + + /* Calculated bits as the overall offset the pin is located at, + * if c->fixed is held, that determines the all the pins in the + * range use the same field with the s_pin. + */ + bits = c->fixed ? c->s_bit : c->s_bit + (pin - c->s_pin) * (c->x_bits); + + /* Fill pfd from bits. For example 32-bit register applied is assumed + * when c->sz_reg is equal to 32. + */ + pfd->offset = c->s_addr + c->x_addrs * (bits / c->sz_reg); + pfd->bitpos = bits % c->sz_reg; + pfd->mask = (1 << c->x_bits) - 1; + + /* pfd->next is used for indicating that bit wrapping-around happens + * which requires the manipulation for bit 0 starting in the next + * register to form the complete field read/write. + */ + pfd->next = pfd->bitpos + c->x_bits > c->sz_reg ? c->x_addrs : 0; + + return 0; +} + +static int mtk_hw_pin_field_get(struct udevice *dev, int pin, + int field, struct mtk_pin_field *pfd) +{ + struct mtk_pinctrl_priv *priv = dev_get_priv(dev); + const struct mtk_pin_reg_calc *rc; + + if (field < 0 || field >= PINCTRL_PIN_REG_MAX) + return -EINVAL; + + if (priv->soc->reg_cal && priv->soc->reg_cal[field].range) + rc = &priv->soc->reg_cal[field]; + else + return -EINVAL; + + return mtk_hw_pin_field_lookup(dev, pin, rc, pfd); +} + +static void mtk_hw_bits_part(struct mtk_pin_field *pf, int *h, int *l) +{ + *l = 32 - pf->bitpos; + *h = get_count_order(pf->mask) - *l; +} + +static void mtk_hw_write_cross_field(struct udevice *dev, + struct mtk_pin_field *pf, int value) +{ + int nbits_l, nbits_h; + + mtk_hw_bits_part(pf, &nbits_h, &nbits_l); + + mtk_rmw(dev, pf->offset, pf->mask << pf->bitpos, + (value & pf->mask) << pf->bitpos); + + mtk_rmw(dev, pf->offset + pf->next, BIT(nbits_h) - 1, + (value & pf->mask) >> nbits_l); +} + +static void mtk_hw_read_cross_field(struct udevice *dev, + struct mtk_pin_field *pf, int *value) +{ + int nbits_l, nbits_h, h, l; + + mtk_hw_bits_part(pf, &nbits_h, &nbits_l); + + l = (mtk_r32(dev, pf->offset) >> pf->bitpos) & (BIT(nbits_l) - 1); + h = (mtk_r32(dev, pf->offset + pf->next)) & (BIT(nbits_h) - 1); + + *value = (h << nbits_l) | l; +} + +static int mtk_hw_set_value(struct udevice *dev, int pin, int field, + int value) +{ + struct mtk_pin_field pf; + int err; + + err = mtk_hw_pin_field_get(dev, pin, field, &pf); + if (err) + return err; + + if (!pf.next) + mtk_rmw(dev, pf.offset, pf.mask << pf.bitpos, + (value & pf.mask) << pf.bitpos); + else + mtk_hw_write_cross_field(dev, &pf, value); + + return 0; +} + +static int mtk_hw_get_value(struct udevice *dev, int pin, int field, + int *value) +{ + struct mtk_pin_field pf; + int err; + + err = mtk_hw_pin_field_get(dev, pin, field, &pf); + if (err) + return err; + + if (!pf.next) + *value = (mtk_r32(dev, pf.offset) >> pf.bitpos) & pf.mask; + else + mtk_hw_read_cross_field(dev, &pf, value); + + return 0; +} + +static int mtk_get_groups_count(struct udevice *dev) +{ + struct mtk_pinctrl_priv *priv = dev_get_priv(dev); + + return priv->soc->ngrps; +} + +static const char *mtk_get_pin_name(struct udevice *dev, + unsigned int selector) +{ + struct mtk_pinctrl_priv *priv = dev_get_priv(dev); + + if (!priv->soc->grps[selector].name) + return mtk_pinctrl_dummy_name; + + return priv->soc->pins[selector].name; +} + +static int mtk_get_pins_count(struct udevice *dev) +{ + struct mtk_pinctrl_priv *priv = dev_get_priv(dev); + + return priv->soc->npins; +} + +static const char *mtk_get_group_name(struct udevice *dev, + unsigned int selector) +{ + struct mtk_pinctrl_priv *priv = dev_get_priv(dev); + + if (!priv->soc->grps[selector].name) + return mtk_pinctrl_dummy_name; + + return priv->soc->grps[selector].name; +} + +static int mtk_get_functions_count(struct udevice *dev) +{ + struct mtk_pinctrl_priv *priv = dev_get_priv(dev); + + return priv->soc->nfuncs; +} + +static const char *mtk_get_function_name(struct udevice *dev, + unsigned int selector) +{ + struct mtk_pinctrl_priv *priv = dev_get_priv(dev); + + if (!priv->soc->funcs[selector].name) + return mtk_pinctrl_dummy_name; + + return priv->soc->funcs[selector].name; +} + +static int mtk_pinmux_group_set(struct udevice *dev, + unsigned int group_selector, + unsigned int func_selector) +{ + struct mtk_pinctrl_priv *priv = dev_get_priv(dev); + const struct mtk_group_desc *grp = + &priv->soc->grps[group_selector]; + int i; + + for (i = 0; i < grp->num_pins; i++) { + int *pin_modes = grp->data; + + mtk_hw_set_value(dev, grp->pins[i], PINCTRL_PIN_REG_MODE, + pin_modes[i]); + } + + return 0; +} + +#if CONFIG_IS_ENABLED(PINCONF) +static const struct pinconf_param mtk_conf_params[] = { + { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 }, + { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 }, + { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 }, + { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 }, + { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 }, + { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 }, + { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 }, + { "output-enable", PIN_CONFIG_OUTPUT_ENABLE, 1 }, + { "output-high", PIN_CONFIG_OUTPUT, 1, }, + { "output-low", PIN_CONFIG_OUTPUT, 0, }, + { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 }, +}; + +int mtk_pinconf_drive_set(struct udevice *dev, u32 pin, u32 arg) +{ + struct mtk_pinctrl_priv *priv = dev_get_priv(dev); + const struct mtk_pin_desc *desc = &priv->soc->pins[pin]; + const struct mtk_drive_desc *tb; + int err = -ENOTSUPP; + + tb = &mtk_drive[desc->drv_n]; + /* 4mA when (e8, e4) = (0, 0) + * 8mA when (e8, e4) = (0, 1) + * 12mA when (e8, e4) = (1, 0) + * 16mA when (e8, e4) = (1, 1) + */ + if ((arg >= tb->min && arg <= tb->max) && !(arg % tb->step)) { + arg = (arg / tb->step - 1) * tb->scal; + + err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_DRV, arg); + if (err) + return err; + } + + return 0; +} + +static int mtk_pinconf_set(struct udevice *dev, unsigned int pin, + unsigned int param, unsigned int arg) +{ + int err = 0; + + switch (param) { + case PIN_CONFIG_BIAS_DISABLE: + case PIN_CONFIG_BIAS_PULL_UP: + case PIN_CONFIG_BIAS_PULL_DOWN: + arg = (param == PIN_CONFIG_BIAS_DISABLE) ? 0 : + (param == PIN_CONFIG_BIAS_PULL_UP) ? 3 : 2; + + err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_PULLSEL, + arg & 1); + if (err) + goto err; + + err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_PULLEN, + !!(arg & 2)); + if (err) + goto err; + break; + case PIN_CONFIG_OUTPUT_ENABLE: + err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_SMT, 0); + if (err) + goto err; + err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_DIR, 1); + if (err) + goto err; + break; + case PIN_CONFIG_INPUT_ENABLE: + err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_IES, 1); + if (err) + goto err; + err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_DIR, 0); + if (err) + goto err; + break; + case PIN_CONFIG_OUTPUT: + err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_DIR, 1); + if (err) + goto err; + + err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_DO, arg); + if (err) + goto err; + break; + case PIN_CONFIG_INPUT_SCHMITT_ENABLE: + /* arg = 1: Input mode & SMT enable ; + * arg = 0: Output mode & SMT disable + */ + arg = arg ? 2 : 1; + err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_DIR, + arg & 1); + if (err) + goto err; + + err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_SMT, + !!(arg & 2)); + if (err) + goto err; + break; + case PIN_CONFIG_DRIVE_STRENGTH: + err = mtk_pinconf_drive_set(dev, pin, arg); + if (err) + goto err; + break; + + default: + err = -ENOTSUPP; + } + +err: + + return err; +} + +static int mtk_pinconf_group_set(struct udevice *dev, + unsigned int group_selector, + unsigned int param, unsigned int arg) +{ + struct mtk_pinctrl_priv *priv = dev_get_priv(dev); + const struct mtk_group_desc *grp = + &priv->soc->grps[group_selector]; + int i, ret; + + for (i = 0; i < grp->num_pins; i++) { + ret = mtk_pinconf_set(dev, grp->pins[i], param, arg); + if (ret) + return ret; + } + + return 0; +} +#endif + +const struct pinctrl_ops mtk_pinctrl_ops = { + .get_pins_count = mtk_get_pins_count, + .get_pin_name = mtk_get_pin_name, + .get_groups_count = mtk_get_groups_count, + .get_group_name = mtk_get_group_name, + .get_functions_count = mtk_get_functions_count, + .get_function_name = mtk_get_function_name, + .pinmux_group_set = mtk_pinmux_group_set, +#if CONFIG_IS_ENABLED(PINCONF) + .pinconf_num_params = ARRAY_SIZE(mtk_conf_params), + .pinconf_params = mtk_conf_params, + .pinconf_set = mtk_pinconf_set, + .pinconf_group_set = mtk_pinconf_group_set, +#endif + .set_state = pinctrl_generic_set_state, +}; + +static int mtk_gpio_get(struct udevice *dev, unsigned int off) +{ + int val, err; + + err = mtk_hw_get_value(dev->parent, off, PINCTRL_PIN_REG_DI, &val); + if (err) + return err; + + return !!val; +} + +static int mtk_gpio_set(struct udevice *dev, unsigned int off, int val) +{ + return mtk_hw_set_value(dev->parent, off, PINCTRL_PIN_REG_DO, !!val); +} + +static int mtk_gpio_get_direction(struct udevice *dev, unsigned int off) +{ + int val, err; + + err = mtk_hw_get_value(dev->parent, off, PINCTRL_PIN_REG_DIR, &val); + if (err) + return err; + + return val ? GPIOF_OUTPUT : GPIOF_INPUT; +} + +static int mtk_gpio_direction_input(struct udevice *dev, unsigned int off) +{ + return mtk_hw_set_value(dev->parent, off, PINCTRL_PIN_REG_DIR, 0); +} + +static int mtk_gpio_direction_output(struct udevice *dev, + unsigned int off, int val) +{ + mtk_gpio_set(dev, off, val); + + /* And set the requested value */ + return mtk_hw_set_value(dev->parent, off, PINCTRL_PIN_REG_DIR, 1); +} + +static int mtk_gpio_request(struct udevice *dev, unsigned int off, + const char *label) +{ + return mtk_hw_set_value(dev->parent, off, PINCTRL_PIN_REG_MODE, 0); +} + +static int mtk_gpio_probe(struct udevice *dev) +{ + struct mtk_pinctrl_priv *priv = dev_get_priv(dev->parent); + struct gpio_dev_priv *uc_priv; + + uc_priv = dev_get_uclass_priv(dev); + uc_priv->bank_name = priv->soc->name; + uc_priv->gpio_count = priv->soc->npins; + + return 0; +} + +static const struct dm_gpio_ops mtk_gpio_ops = { + .request = mtk_gpio_request, + .set_value = mtk_gpio_set, + .get_value = mtk_gpio_get, + .get_function = mtk_gpio_get_direction, + .direction_input = mtk_gpio_direction_input, + .direction_output = mtk_gpio_direction_output, +}; + +static struct driver mtk_gpio_driver = { + .name = "mediatek_gpio", + .id = UCLASS_GPIO, + .probe = mtk_gpio_probe, + .ops = &mtk_gpio_ops, +}; + +static int mtk_gpiochip_register(struct udevice *parent) +{ + struct uclass_driver *drv; + struct udevice *dev; + int ret; + ofnode node; + + drv = lists_uclass_lookup(UCLASS_GPIO); + if (!drv) + return -ENOENT; + + dev_for_each_subnode(node, parent) + if (ofnode_read_bool(node, "gpio-controller")) { + ret = 0; + break; + } + + if (ret) + return ret; + + ret = device_bind_with_driver_data(parent, &mtk_gpio_driver, + "mediatek_gpio", 0, node, + &dev); + if (ret) + return ret; + + return 0; +} + +int mtk_pinctrl_common_probe(struct udevice *dev, + struct mtk_pinctrl_soc *soc) +{ + struct mtk_pinctrl_priv *priv = dev_get_priv(dev); + int ret; + + priv->base = dev_read_addr_ptr(dev); + if (priv->base == (void *)FDT_ADDR_T_NONE) + return -EINVAL; + + priv->soc = soc; + + ret = mtk_gpiochip_register(dev); + if (ret) + return ret; + + return 0; +} |