diff options
| -rw-r--r-- | drivers/pinctrl/meson/Kconfig | 3 | ||||
| -rw-r--r-- | drivers/pinctrl/meson/Makefile | 1 | ||||
| -rw-r--r-- | drivers/pinctrl/meson/pinctrl-meson-axg-pmx.c | 118 | ||||
| -rw-r--r-- | drivers/pinctrl/meson/pinctrl-meson-axg-pmx.h | 62 | ||||
| -rw-r--r-- | drivers/pinctrl/meson/pinctrl-meson.h | 1 |
5 files changed, 185 insertions, 0 deletions
diff --git a/drivers/pinctrl/meson/Kconfig b/drivers/pinctrl/meson/Kconfig index 1a51778759ea..fe5e6ca88412 100644 --- a/drivers/pinctrl/meson/Kconfig +++ b/drivers/pinctrl/meson/Kconfig @@ -38,4 +38,7 @@ config PINCTRL_MESON_GXL config PINCTRL_MESON8_PMX bool +config PINCTRL_MESON_AXG_PMX + bool + endif diff --git a/drivers/pinctrl/meson/Makefile b/drivers/pinctrl/meson/Makefile index cbd47bb74549..8de839512677 100644 --- a/drivers/pinctrl/meson/Makefile +++ b/drivers/pinctrl/meson/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_PINCTRL_MESON8) += pinctrl-meson8.o obj-$(CONFIG_PINCTRL_MESON8B) += pinctrl-meson8b.o obj-$(CONFIG_PINCTRL_MESON_GXBB) += pinctrl-meson-gxbb.o obj-$(CONFIG_PINCTRL_MESON_GXL) += pinctrl-meson-gxl.o +obj-$(CONFIG_PINCTRL_MESON_AXG_PMX) += pinctrl-meson-axg-pmx.o diff --git a/drivers/pinctrl/meson/pinctrl-meson-axg-pmx.c b/drivers/pinctrl/meson/pinctrl-meson-axg-pmx.c new file mode 100644 index 000000000000..e8931d9cf863 --- /dev/null +++ b/drivers/pinctrl/meson/pinctrl-meson-axg-pmx.c @@ -0,0 +1,118 @@ +/* + * Second generation of pinmux driver for Amlogic Meson-AXG SoC. + * + * Copyright (c) 2017 Baylibre SAS. + * Author: Jerome Brunet <jbrunet@baylibre.com> + * + * Copyright (c) 2017 Amlogic, Inc. All rights reserved. + * Author: Xingyu Chen <xingyu.chen@amlogic.com> + * + * SPDX-License-Identifier: (GPL-2.0+ or MIT) + */ + +/* + * This new generation of pinctrl IP is mainly adopted by the + * Meson-AXG SoC and later series, which use 4-width continuous + * register bit to select the function for each pin. + * + * The value 0 is always selecting the GPIO mode, while other + * values (start from 1) for selecting the function mode. + */ +#include <linux/device.h> +#include <linux/regmap.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinmux.h> + +#include "pinctrl-meson.h" +#include "pinctrl-meson-axg-pmx.h" + +static int meson_axg_pmx_get_bank(struct meson_pinctrl *pc, + unsigned int pin, + struct meson_pmx_bank **bank) +{ + int i; + struct meson_axg_pmx_data *pmx = pc->data->pmx_data; + + for (i = 0; i < pmx->num_pmx_banks; i++) + if (pin >= pmx->pmx_banks[i].first && + pin <= pmx->pmx_banks[i].last) { + *bank = &pmx->pmx_banks[i]; + return 0; + } + + return -EINVAL; +} + +static int meson_pmx_calc_reg_and_offset(struct meson_pmx_bank *bank, + unsigned int pin, unsigned int *reg, + unsigned int *offset) +{ + int shift; + + shift = pin - bank->first; + + *reg = bank->reg + (bank->offset + (shift << 2)) / 32; + *offset = (bank->offset + (shift << 2)) % 32; + + return 0; +} + +static int meson_axg_pmx_update_function(struct meson_pinctrl *pc, + unsigned int pin, unsigned int func) +{ + int ret; + int reg; + int offset; + struct meson_pmx_bank *bank; + + ret = meson_axg_pmx_get_bank(pc, pin, &bank); + if (ret) + return ret; + + meson_pmx_calc_reg_and_offset(bank, pin, ®, &offset); + + ret = regmap_update_bits(pc->reg_mux, reg << 2, + 0xf << offset, (func & 0xf) << offset); + + return ret; +} + +static int meson_axg_pmx_set_mux(struct pinctrl_dev *pcdev, + unsigned int func_num, unsigned int group_num) +{ + int i; + int ret; + struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev); + struct meson_pmx_func *func = &pc->data->funcs[func_num]; + struct meson_pmx_group *group = &pc->data->groups[group_num]; + struct meson_pmx_axg_data *pmx_data = + (struct meson_pmx_axg_data *)group->data; + + dev_dbg(pc->dev, "enable function %s, group %s\n", func->name, + group->name); + + for (i = 0; i < group->num_pins; i++) { + ret = meson_axg_pmx_update_function(pc, group->pins[i], + pmx_data->func); + if (ret) + return ret; + } + + return 0; +} + +static int meson_axg_pmx_request_gpio(struct pinctrl_dev *pcdev, + struct pinctrl_gpio_range *range, unsigned int offset) +{ + struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev); + + return meson_axg_pmx_update_function(pc, offset, 0); +} + +const struct pinmux_ops meson_axg_pmx_ops = { + .set_mux = meson_axg_pmx_set_mux, + .get_functions_count = meson_pmx_get_funcs_count, + .get_function_name = meson_pmx_get_func_name, + .get_function_groups = meson_pmx_get_groups, + .gpio_request_enable = meson_axg_pmx_request_gpio, +}; diff --git a/drivers/pinctrl/meson/pinctrl-meson-axg-pmx.h b/drivers/pinctrl/meson/pinctrl-meson-axg-pmx.h new file mode 100644 index 000000000000..8ff88bf2e849 --- /dev/null +++ b/drivers/pinctrl/meson/pinctrl-meson-axg-pmx.h @@ -0,0 +1,62 @@ +/* + * Copyright (c) 2017 Baylibre SAS. + * Author: Jerome Brunet <jbrunet@baylibre.com> + * + * Copyright (c) 2017 Amlogic, Inc. All rights reserved. + * Author: Xingyu Chen <xingyu.chen@amlogic.com> + * + * SPDX-License-Identifier: (GPL-2.0+ or MIT) + */ + +struct meson_pmx_bank { + const char *name; + unsigned int first; + unsigned int last; + unsigned int reg; + unsigned int offset; +}; + +struct meson_axg_pmx_data { + struct meson_pmx_bank *pmx_banks; + unsigned int num_pmx_banks; +}; + +#define BANK_PMX(n, f, l, r, o) \ + { \ + .name = n, \ + .first = f, \ + .last = l, \ + .reg = r, \ + .offset = o, \ + } + +struct meson_pmx_axg_data { + unsigned int func; +}; + +#define PMX_DATA(f) \ + { \ + .func = f, \ + } + +#define GROUP(grp, f) \ + { \ + .name = #grp, \ + .pins = grp ## _pins, \ + .num_pins = ARRAY_SIZE(grp ## _pins), \ + .data = (const struct meson_pmx_axg_data[]){ \ + PMX_DATA(f), \ + }, \ + } + +#define GPIO_GROUP(gpio) \ + { \ + .name = #gpio, \ + .pins = (const unsigned int[]){ gpio }, \ + .num_pins = 1, \ + .data = (const struct meson_pmx_axg_data[]){ \ + PMX_DATA(0), \ + }, \ + } + +extern const struct pinmux_ops meson_axg_pmx_ops; diff --git a/drivers/pinctrl/meson/pinctrl-meson.h b/drivers/pinctrl/meson/pinctrl-meson.h index 183b6e471635..12a391109329 100644 --- a/drivers/pinctrl/meson/pinctrl-meson.h +++ b/drivers/pinctrl/meson/pinctrl-meson.h @@ -108,6 +108,7 @@ struct meson_pinctrl_data { struct meson_bank *banks; unsigned int num_banks; const struct pinmux_ops *pmx_ops; + void *pmx_data; }; struct meson_pinctrl { |