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Diffstat (limited to 'drivers/pinctrl/meson/pinctrl-meson-axg-pmx.c')
-rw-r--r--drivers/pinctrl/meson/pinctrl-meson-axg-pmx.c121
1 files changed, 121 insertions, 0 deletions
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 000000000..80c43683c
--- /dev/null
+++ b/drivers/pinctrl/meson/pinctrl-meson-axg-pmx.c
@@ -0,0 +1,121 @@
+/*
+ * 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, &reg, &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,
+};
+EXPORT_SYMBOL_GPL(meson_axg_pmx_ops);
+
+MODULE_LICENSE("Dual BSD/GPL");