pinctrl: tegra: Add Tegra194 pinmux driver

Tegra194 has PCIE L5 rst and clkreq pins which need to be controlled
dynamically at runtime. This driver supports change pinmux for these
pins. Pinmux for rest of the pins is set statically by bootloader and
will not be changed by this driver

Signed-off-by: Krishna Yarlagadda <kyarlagadda@nvidia.com>
Signed-off-by: Suresh Mangipudi <smangipudi@nvidia.com>
Tested-by: Vidya Sagar <vidyas@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 170 insertions, 0 deletions

diff --git a/drivers/pinctrl/tegra/pinctrl-tegra194.c b/drivers/pinctrl/tegra/pinctrl-tegra194.c
new file mode 100644
index 000000000000..957ef198850a
--- /dev/null
+++ b/drivers/pinctrl/tegra/pinctrl-tegra194.c
@@ -0,0 +1,170 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Pinctrl data for the NVIDIA Tegra194 pinmux
+ *
+ * Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/init.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+
+#include "pinctrl-tegra.h"
+
+/* Define unique ID for each pins */
+enum pin_id {
+	TEGRA_PIN_PEX_L5_CLKREQ_N_PGG0 = 256,
+	TEGRA_PIN_PEX_L5_RST_N_PGG1 = 257,
+	TEGRA_PIN_NUM_GPIOS = 258,
+};
+
+/* Table for pin descriptor */
+static const struct pinctrl_pin_desc tegra194_pins[] = {
+	PINCTRL_PIN(TEGRA_PIN_PEX_L5_CLKREQ_N_PGG0,
+		    "TEGRA_PIN_PEX_L5_CLKREQ_N_PGG0"),
+	PINCTRL_PIN(TEGRA_PIN_PEX_L5_RST_N_PGG1,
+		    "TEGRA_PIN_PEX_L5_RST_N_PGG1"),
+};
+
+static const unsigned int pex_l5_clkreq_n_pgg0_pins[] = {
+	TEGRA_PIN_PEX_L5_CLKREQ_N_PGG0,
+};
+
+static const unsigned int pex_l5_rst_n_pgg1_pins[] = {
+	TEGRA_PIN_PEX_L5_RST_N_PGG1,
+};
+
+/* Define unique ID for each function */
+enum tegra_mux_dt {
+	TEGRA_MUX_RSVD0,
+	TEGRA_MUX_RSVD1,
+	TEGRA_MUX_RSVD2,
+	TEGRA_MUX_RSVD3,
+	TEGRA_MUX_PE5,
+};
+
+/* Make list of each function name */
+#define TEGRA_PIN_FUNCTION(lid)			\
+	{					\
+		.name = #lid,			\
+	}
+static struct tegra_function tegra194_functions[] = {
+	TEGRA_PIN_FUNCTION(rsvd0),
+	TEGRA_PIN_FUNCTION(rsvd1),
+	TEGRA_PIN_FUNCTION(rsvd2),
+	TEGRA_PIN_FUNCTION(rsvd3),
+	TEGRA_PIN_FUNCTION(pe5),
+};
+
+#define DRV_PINGROUP_ENTRY_Y(r, drvdn_b, drvdn_w, drvup_b,	\
+			     drvup_w, slwr_b, slwr_w, slwf_b,	\
+			     slwf_w, bank)			\
+		.drv_reg = ((r)),			\
+		.drv_bank = bank,				\
+		.drvdn_bit = drvdn_b,				\
+		.drvdn_width = drvdn_w,				\
+		.drvup_bit = drvup_b,				\
+		.drvup_width = drvup_w,				\
+		.slwr_bit = slwr_b,				\
+		.slwr_width = slwr_w,				\
+		.slwf_bit = slwf_b,				\
+		.slwf_width = slwf_w
+
+#define PIN_PINGROUP_ENTRY_Y(r, bank, pupd, e_lpbk, e_input,	\
+			     e_od, schmitt_b, drvtype)		\
+		.mux_reg = ((r)),				\
+		.lpmd_bit = -1,					\
+		.lock_bit = -1,					\
+		.hsm_bit = -1,					\
+		.parked_bit = -1,				\
+		.mux_bank = bank,				\
+		.mux_bit = 0,					\
+		.pupd_reg = ((r)),		\
+		.pupd_bank = bank,				\
+		.pupd_bit = 2,					\
+		.tri_reg = ((r)),				\
+		.tri_bank = bank,				\
+		.tri_bit = 4,					\
+		.einput_bit = e_input,				\
+		.odrain_bit = e_od,				\
+		.schmitt_bit = schmitt_b,			\
+		.drvtype_bit = 13,				\
+		.drv_reg = -1
+
+#define drive_pex_l5_clkreq_n_pgg0				\
+	DRV_PINGROUP_ENTRY_Y(0x14004, 12, 5, 20, 5, -1, -1, -1, -1, 0)
+#define drive_pex_l5_rst_n_pgg1					\
+	DRV_PINGROUP_ENTRY_Y(0x1400c, 12, 5, 20, 5, -1, -1, -1, -1, 0)
+
+#define PINGROUP(pg_name, f0, f1, f2, f3, r, bank, pupd, e_lpbk,	\
+		 e_input, e_lpdr, e_od, schmitt_b, drvtype, io_rail)	\
+	{							\
+		.name = #pg_name,				\
+		.pins = pg_name##_pins,				\
+		.npins = ARRAY_SIZE(pg_name##_pins),		\
+			.funcs = {				\
+				TEGRA_MUX_##f0,			\
+				TEGRA_MUX_##f1,			\
+				TEGRA_MUX_##f2,			\
+				TEGRA_MUX_##f3,			\
+			},					\
+		PIN_PINGROUP_ENTRY_Y(r, bank, pupd, e_lpbk,	\
+				     e_input, e_od,		\
+				     schmitt_b, drvtype),	\
+		drive_##pg_name,				\
+	}
+
+static const struct tegra_pingroup tegra194_groups[] = {
+	PINGROUP(pex_l5_clkreq_n_pgg0, PE5, RSVD1, RSVD2, RSVD3, 0x14000, 0,
+		 Y, -1, 6, 8, 11, 12, N, "vddio_pex_ctl_2"),
+	PINGROUP(pex_l5_rst_n_pgg1, PE5, RSVD1, RSVD2, RSVD3, 0x14008, 0,
+		 Y, -1, 6, 8, 11, 12, N, "vddio_pex_ctl_2"),
+};
+
+static const struct tegra_pinctrl_soc_data tegra194_pinctrl = {
+	.ngpios = TEGRA_PIN_NUM_GPIOS,
+	.pins = tegra194_pins,
+	.npins = ARRAY_SIZE(tegra194_pins),
+	.functions = tegra194_functions,
+	.nfunctions = ARRAY_SIZE(tegra194_functions),
+	.groups = tegra194_groups,
+	.ngroups = ARRAY_SIZE(tegra194_groups),
+	.hsm_in_mux = true,
+	.schmitt_in_mux = true,
+	.drvtype_in_mux = true,
+};
+
+static int tegra194_pinctrl_probe(struct platform_device *pdev)
+{
+	return tegra_pinctrl_probe(pdev, &tegra194_pinctrl);
+}
+
+static const struct of_device_id tegra194_pinctrl_of_match[] = {
+	{ .compatible = "nvidia,tegra194-pinmux", },
+	{ },
+};
+
+static struct platform_driver tegra194_pinctrl_driver = {
+	.driver = {
+		.name = "tegra194-pinctrl",
+		.of_match_table = tegra194_pinctrl_of_match,
+	},
+	.probe = tegra194_pinctrl_probe,
+};
+
+static int __init tegra194_pinctrl_init(void)
+{
+	return platform_driver_register(&tegra194_pinctrl_driver);
+}
+arch_initcall(tegra194_pinctrl_init);