[PATCH v3 3/4] pinctrl-tz1090-pdc: add TZ1090 PDC pinctrl driver

From: James Hogan
Date: Thu Jun 20 2013 - 05:28:40 EST

Add a pin control driver for the TZ1090's low power pins via the
powerdown controller SOC_GPIO_CONTROL registers.

These pins have individually controlled pull-up, and group controlled
schmitt, slew-rate, drive-strength, and power-on-start (pos).

The pdc_gpio0 and pdc_gpio1 pins can also be muxed onto the
ir_mod_stable_out and ir_mod_power_out functions respectively. If no
function is set they remain in GPIO mode. These muxes can be overridden
by requesting them as GPIOs.

Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
Cc: Grant Likely <grant.likely@xxxxxxxxxx>
Cc: Rob Herring <rob.herring@xxxxxxxxxxx>
Cc: Rob Landley <rob@xxxxxxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: linux-doc@xxxxxxxxxxxxxxx
Cc: devicetree-discuss@xxxxxxxxxxxxxxxx
---
Changes in v3:
- separated from irq-imgpdc and removed arch/metag changes to allow
these patches to go upstream separately via the pinctrl[/gpio] trees
(particularly the pinctrl drivers depend on the new pinconf DT
bindings).
- some s/unsigned/unsigned int/.
- pinctrl-tz1090*: switch to generic pinconfig DT bindings and
pinconf_generic_dump_config.
- pinctrl-tz1090*: use tz1090, prefix for pins and function in DT
bindings.
- pinctrl-tz1090*: make internal functions static.
- pinctrl-tz1090*: move initcall from postcore to arch.

Changes in v2:
- pinctrl-tz1090-pdc: switched to generic pinconf (a previous patch
adds the BIAS_BUS_HOLD generic pinconf)
- pinctrl-tz1090-pdc: changed device tree bindings to more closely
match generic pinconf (separate tristate, pull-up, pull-down,
bus-hold flags instead of pull=<X>, drive-strength measured in mA)
- pinctrl-tz1090-pdc: make use of BIT() from linux/bitops.h
- pinctrl-tz1090-pdc: add a whole bunch of comments

.../bindings/pinctrl/img,tz1090-pdc-pinctrl.txt | 130 +++
drivers/pinctrl/Kconfig | 6 +
drivers/pinctrl/Makefile | 1 +
drivers/pinctrl/pinctrl-tz1090-pdc.c | 1029 ++++++++++++++++++++
4 files changed, 1166 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pinctrl/img,tz1090-pdc-pinctrl.txt
create mode 100644 drivers/pinctrl/pinctrl-tz1090-pdc.c

diff --git a/Documentation/devicetree/bindings/pinctrl/img,tz1090-pdc-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/img,tz1090-pdc-pinctrl.txt
new file mode 100644
index 0000000..9f7a85b
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/img,tz1090-pdc-pinctrl.txt
@@ -0,0 +1,130 @@
+ImgTec TZ1090 PDC pin controller
+
+Required properties:
+- compatible: "img,tz1090-pdc-pinctrl"
+- reg: Should contain the register physical address and length of the
+ SOC_GPIO_CONTROL registers in the PDC register region.
+
+Please refer to pinctrl-bindings.txt in this directory for details of the
+common pinctrl bindings used by client devices, including the meaning of the
+phrase "pin configuration node".
+
+TZ1090-PDC's pin configuration nodes act as a container for an abitrary number
+of subnodes. Each of these subnodes represents some desired configuration for a
+pin, a group, or a list of pins or groups. This configuration can include the
+mux function to select on those pin(s)/group(s), and various pin configuration
+parameters, such as pull-up, drive strength, etc.
+
+The name of each subnode is not important; all subnodes should be enumerated
+and processed purely based on their content.
+
+Each subnode only affects those parameters that are explicitly listed. In
+other words, a subnode that lists a mux function but no pin configuration
+parameters implies no information about any pin configuration parameters.
+Similarly, a pin subnode that describes a pullup parameter implies no
+information about e.g. the mux function. For this reason, even seemingly boolean
+values are actually tristates in this binding: unspecified, off, or on.
+Unspecified is represented as an absent property, and off/on are represented as
+integer values 0 and 1.
+
+Required subnode-properties:
+- tz1090,pins : An array of strings. Each string contains the name of a pin or
+ group. Valid values for these names are listed below.
+
+Optional subnode-properties:
+- tz1090,function: A string containing the name of the function to mux to the
+ pin or group. Valid values for function names are listed below, including
+ which pingroups can be muxed to them.
+- supported generic pinconfig properties (for further details see
+ Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt):
+ - bias-disable
+ - bias-high-impedance
+ - bias-bus-hold
+ - bias-pull-up
+ - bias-pull-down
+ - input-schmitt-enable
+ - input-schmitt-disable
+ - slew-rate: Integer, control slew rate of pins.
+ 0: slow (half frequency)
+ 1: fast
+ - drive-strength: Integer, control drive strength of pins in mA.
+ 2: 2mA
+ 4: 4mA
+ 8: 8mA
+ 12: 12mA
+ - low-power-enable: Flag, power-on-start weak pull-down for invalid power.
+ - low-power-disable: Flag, power-on-start weak pull-down disabled.
+
+Note that many of these properties are only valid for certain specific pins
+or groups. See the TZ1090 TRM for complete details regarding which groups
+support which functionality. The Linux pinctrl driver may also be a useful
+reference.
+
+Valid values for pin and group names are:
+
+ pins:
+
+ These all support bias-high-impediance, bias-pull-up, bias-pull-down, and
+ bias-bus-hold (which can also be provided to any of the groups below to set
+ it for all gpio pins in that group).
+
+ gpio0, gpio1, sys_wake0, sys_wake1, sys_wake2, ir_data, ext_power.
+
+ mux groups:
+
+ These all support function.
+
+ gpio0
+ pins: gpio0.
+ function: ir_mod_stable_out.
+ gpio1
+ pins: gpio1.
+ function: ir_mod_power_out.
+
+ drive groups:
+
+ These support input-schmitt-enable, input-schmitt-disable, slew-rate,
+ drive-strength, low-power-enable, and low-power-disable.
+
+ pdc
+ pins: gpio0, gpio1, sys_wake0, sys_wake1, sys_wake2, ir_data,
+ ext_power.
+
+Example:
+
+ pinctrl_pdc: pinctrl@02006500 {
+ #gpio-range-cells = <3>;
+ compatible = "img,tz1090-pdc-pinctrl";
+ reg = <0x02006500 0x100>;
+ };
+
+Example board file extracts:
+
+ &pinctrl_pdc {
+ pinctrl-names = "default";
+ pinctrl-0 = <&syswake_default>;
+
+ syswake_default: syswakes {
+ syswake_cfg {
+ tz1090,pins = "sys_wake0",
+ "sys_wake1",
+ "sys_wake2";
+ pull-up;
+ };
+ };
+ irmod_default: irmod {
+ gpio0_cfg {
+ tz1090,pins = "gpio0";
+ tz1090,function = "ir_mod_stable_out";
+ };
+ gpio1_cfg {
+ tz1090,pins = "gpio1";
+ tz1090,function = "ir_mod_power_out";
+ };
+ };
+ };
+
+ ir: ir@02006200 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&irmod_default>;
+ };
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index acdaa08..74ec834 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -218,6 +218,12 @@ config PINCTRL_TZ1090
select PINMUX
select GENERIC_PINCONF

+config PINCTRL_TZ1090_PDC
+ bool "Toumaz Xenif TZ1090 PDC pin control driver"
+ depends on SOC_TZ1090
+ select PINMUX
+ select PINCONF
+
config PINCTRL_U300
bool "U300 pin controller driver"
depends on ARCH_U300
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index 37ff29e..cf699a5 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_PINCTRL_TEGRA20) += pinctrl-tegra20.o
obj-$(CONFIG_PINCTRL_TEGRA30) += pinctrl-tegra30.o
obj-$(CONFIG_PINCTRL_TEGRA114) += pinctrl-tegra114.o
obj-$(CONFIG_PINCTRL_TZ1090) += pinctrl-tz1090.o
+obj-$(CONFIG_PINCTRL_TZ1090_PDC) += pinctrl-tz1090-pdc.o
obj-$(CONFIG_PINCTRL_U300) += pinctrl-u300.o
obj-$(CONFIG_PINCTRL_COH901) += pinctrl-coh901.o
obj-$(CONFIG_PINCTRL_SAMSUNG) += pinctrl-samsung.o
diff --git a/drivers/pinctrl/pinctrl-tz1090-pdc.c b/drivers/pinctrl/pinctrl-tz1090-pdc.c
new file mode 100644
index 0000000..12e4808
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-tz1090-pdc.c
@@ -0,0 +1,1029 @@
+/*
+ * Pinctrl driver for the Toumaz Xenif TZ1090 PowerDown Controller pins
+ *
+ * Copyright (c) 2013, Imagination Technologies Ltd.
+ *
+ * Derived from Tegra code:
+ * Copyright (c) 2011-2012, NVIDIA CORPORATION. All rights reserved.
+ *
+ * Derived from code:
+ * Copyright (C) 2010 Google, Inc.
+ * Copyright (C) 2010 NVIDIA Corporation
+ * Copyright (C) 2009-2011 ST-Ericsson AB
+ *
+ * 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/bitops.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/machine.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/slab.h>
+
+/*
+ * The registers may be shared with other threads/cores, so we need to use the
+ * metag global lock2 for atomicity.
+ */
+#include <asm/global_lock.h>
+
+#include "core.h"
+#include "pinconf.h"
+
+/* Register offsets from bank base address */
+#define REG_GPIO_CONTROL0 0x00
+#define REG_GPIO_CONTROL2 0x08
+
+/* Register field information */
+#define REG_GPIO_CONTROL2_PU_PD_S 16
+#define REG_GPIO_CONTROL2_PDC_POS_S 4
+#define REG_GPIO_CONTROL2_PDC_DR_S 2
+#define REG_GPIO_CONTROL2_PDC_SR_S 1
+#define REG_GPIO_CONTROL2_PDC_SCHMITT_S 0
+
+/* PU_PD field values */
+#define REG_PU_PD_TRISTATE 0
+#define REG_PU_PD_UP 1
+#define REG_PU_PD_DOWN 2
+#define REG_PU_PD_REPEATER 3
+
+/* DR field values */
+#define REG_DR_2mA 0
+#define REG_DR_4mA 1
+#define REG_DR_8mA 2
+#define REG_DR_12mA 3
+
+/**
+ * struct tz1090_pdc_function - TZ1090 PDC pinctrl mux function
+ * @name: The name of the function, exported to pinctrl core.
+ * @groups: An array of pin groups that may select this function.
+ * @ngroups: The number of entries in @groups.
+ */
+struct tz1090_pdc_function {
+ const char *name;
+ const char * const *groups;
+ unsigned int ngroups;
+};
+
+/**
+ * struct tz1090_pdc_pingroup - TZ1090 PDC pin group
+ * @name: Name of pin group.
+ * @pins: Array of pin numbers in this pin group.
+ * @npins: Number of pins in this pin group.
+ * @func: Function enabled by the mux.
+ * @reg: Mux register offset.
+ * @bit: Mux register bit.
+ * @drv: Drive control supported, otherwise it's a mux.
+ * This means Schmitt, Slew, and Drive strength.
+ *
+ * A representation of a group of pins (possibly just one pin) in the TZ1090
+ * PDC pin controller. Each group allows some parameter or parameters to be
+ * configured. The most common is mux function selection.
+ */
+struct tz1090_pdc_pingroup {
+ const char *name;
+ const unsigned int *pins;
+ unsigned int npins;
+ int func;
+ u16 reg;
+ u8 bit;
+ bool drv;
+};
+
+/*
+ * All PDC pins can be GPIOs. Define these first to match how the GPIO driver
+ * names/numbers its pins.
+ */
+
+enum tz1090_pdc_pin {
+ TZ1090_PDC_PIN_GPIO0,
+ TZ1090_PDC_PIN_GPIO1,
+ TZ1090_PDC_PIN_SYS_WAKE0,
+ TZ1090_PDC_PIN_SYS_WAKE1,
+ TZ1090_PDC_PIN_SYS_WAKE2,
+ TZ1090_PDC_PIN_IR_DATA,
+ TZ1090_PDC_PIN_EXT_POWER,
+};
+
+/* Pin names */
+
+static const struct pinctrl_pin_desc tz1090_pdc_pins[] = {
+ /* PDC GPIOs */
+ PINCTRL_PIN(TZ1090_PDC_PIN_GPIO0, "gpio0"),
+ PINCTRL_PIN(TZ1090_PDC_PIN_GPIO1, "gpio1"),
+ PINCTRL_PIN(TZ1090_PDC_PIN_SYS_WAKE0, "sys_wake0"),
+ PINCTRL_PIN(TZ1090_PDC_PIN_SYS_WAKE1, "sys_wake1"),
+ PINCTRL_PIN(TZ1090_PDC_PIN_SYS_WAKE2, "sys_wake2"),
+ PINCTRL_PIN(TZ1090_PDC_PIN_IR_DATA, "ir_data"),
+ PINCTRL_PIN(TZ1090_PDC_PIN_EXT_POWER, "ext_power"),
+};
+
+/* Pin group pins */
+
+static const unsigned int gpio0_pins[] = {
+ TZ1090_PDC_PIN_GPIO0,
+};
+
+static const unsigned int gpio1_pins[] = {
+ TZ1090_PDC_PIN_GPIO1,
+};
+
+static const unsigned int pdc_pins[] = {
+ TZ1090_PDC_PIN_GPIO0,
+ TZ1090_PDC_PIN_GPIO1,
+ TZ1090_PDC_PIN_SYS_WAKE0,
+ TZ1090_PDC_PIN_SYS_WAKE1,
+ TZ1090_PDC_PIN_SYS_WAKE2,
+ TZ1090_PDC_PIN_IR_DATA,
+ TZ1090_PDC_PIN_EXT_POWER,
+};
+
+/* Mux functions */
+
+enum tz1090_pdc_mux {
+ /* PDC_GPIO0 mux */
+ TZ1090_PDC_MUX_IR_MOD_STABLE_OUT,
+ /* PDC_GPIO1 mux */
+ TZ1090_PDC_MUX_IR_MOD_POWER_OUT,
+};
+
+/* Pin groups a function can be muxed to */
+
+static const char * const gpio0_groups[] = {
+ "gpio0",
+};
+
+static const char * const gpio1_groups[] = {
+ "gpio1",
+};
+
+#define FUNCTION(mux, fname, group) \
+ [(TZ1090_PDC_MUX_ ## mux)] = { \
+ .name = #fname, \
+ .groups = group##_groups, \
+ .ngroups = ARRAY_SIZE(group##_groups), \
+ }
+
+/* Must correlate with enum tz1090_pdc_mux */
+static const struct tz1090_pdc_function tz1090_pdc_functions[] = {
+ /* MUX fn pingroups */
+ FUNCTION(IR_MOD_STABLE_OUT, ir_mod_stable_out, gpio0),
+ FUNCTION(IR_MOD_POWER_OUT, ir_mod_power_out, gpio1),
+};
+
+/**
+ * MUX_PG() - Initialise a pin group with mux control
+ * @pg_name: Pin group name (stringified, _pins appended to get pins array)
+ * @f0: Function 0 (TZ1090_PDC_MUX_ is prepended)
+ * @mux_r: Mux register (REG_PINCTRL_ is prepended)
+ * @mux_b: Bit number in register of mux field
+ */
+#define MUX_PG(pg_name, f0, mux_r, mux_b) \
+ { \
+ .name = #pg_name, \
+ .pins = pg_name##_pins, \
+ .npins = ARRAY_SIZE(pg_name##_pins), \
+ .func = TZ1090_PDC_MUX_ ## f0, \
+ .reg = (REG_ ## mux_r), \
+ .bit = (mux_b), \
+ }
+
+/**
+ * DRV_PG() - Initialise a pin group with drive control
+ * @pg_name: Pin group name (stringified, _pins appended to get pins array)
+ */
+#define DRV_PG(pg_name) \
+ { \
+ .name = #pg_name, \
+ .pins = pg_name##_pins, \
+ .npins = ARRAY_SIZE(pg_name##_pins), \
+ .drv = true, \
+ }
+
+static const struct tz1090_pdc_pingroup tz1090_pdc_groups[] = {
+ /* Muxing pin groups */
+ /* pg_name, f0, mux register, mux bit */
+ MUX_PG(gpio0, IR_MOD_STABLE_OUT, GPIO_CONTROL0, 7),
+ MUX_PG(gpio1, IR_MOD_POWER_OUT, GPIO_CONTROL0, 6),
+
+ /* Drive pin groups */
+ /* pg_name */
+ DRV_PG(pdc),
+};
+
+/**
+ * struct tz1090_pdc_pmx - Private pinctrl data
+ * @dev: Platform device
+ * @pctl: Pin control device
+ * @regs: Register region
+ * @lock: Lock protecting coherency of mux_en and gpio_en
+ * @mux_en: Muxes that have been enabled
+ * @gpio_en: Muxable GPIOs that have been enabled
+ */
+struct tz1090_pdc_pmx {
+ struct device *dev;
+ struct pinctrl_dev *pctl;
+ void __iomem *regs;
+ spinlock_t lock;
+ u32 mux_en;
+ u32 gpio_en;
+};
+
+static inline u32 pmx_read(struct tz1090_pdc_pmx *pmx, u32 reg)
+{
+ return ioread32(pmx->regs + reg);
+}
+
+static inline void pmx_write(struct tz1090_pdc_pmx *pmx, u32 val, u32 reg)
+{
+ iowrite32(val, pmx->regs + reg);
+}
+
+/*
+ * Pin control operations
+ */
+
+static int tz1090_pdc_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+ return ARRAY_SIZE(tz1090_pdc_groups);
+}
+
+static const char *tz1090_pdc_pinctrl_get_group_name(struct pinctrl_dev *pctl,
+ unsigned int group)
+{
+ return tz1090_pdc_groups[group].name;
+}
+
+static int tz1090_pdc_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
+ unsigned int group,
+ const unsigned int **pins,
+ unsigned int *num_pins)
+{
+ *pins = tz1090_pdc_groups[group].pins;
+ *num_pins = tz1090_pdc_groups[group].npins;
+
+ return 0;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static void tz1090_pdc_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s,
+ unsigned int offset)
+{
+ seq_printf(s, " %s", dev_name(pctldev->dev));
+}
+#endif
+
+static int reserve_map(struct device *dev, struct pinctrl_map **map,
+ unsigned int *reserved_maps, unsigned int *num_maps,
+ unsigned int reserve)
+{
+ unsigned int old_num = *reserved_maps;
+ unsigned int new_num = *num_maps + reserve;
+ struct pinctrl_map *new_map;
+
+ if (old_num >= new_num)
+ return 0;
+
+ new_map = krealloc(*map, sizeof(*new_map) * new_num, GFP_KERNEL);
+ if (!new_map) {
+ dev_err(dev, "krealloc(map) failed\n");
+ return -ENOMEM;
+ }
+
+ memset(new_map + old_num, 0, (new_num - old_num) * sizeof(*new_map));
+
+ *map = new_map;
+ *reserved_maps = new_num;
+
+ return 0;
+}
+
+static int add_map_mux(struct pinctrl_map **map, unsigned int *reserved_maps,
+ unsigned int *num_maps, const char *group,
+ const char *function)
+{
+ if (WARN_ON(*num_maps == *reserved_maps))
+ return -ENOSPC;
+
+ (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
+ (*map)[*num_maps].data.mux.group = group;
+ (*map)[*num_maps].data.mux.function = function;
+ (*num_maps)++;
+
+ return 0;
+}
+
+/**
+ * get_group_selector() - returns the group selector for a group
+ * @pin_group: the pin group to look up
+ *
+ * This is the same as pinctrl_get_group_selector except it doesn't produce an
+ * error message if the group isn't found or debug messages.
+ */
+static int get_group_selector(const char *pin_group)
+{
+ unsigned int group;
+
+ for (group = 0; group < ARRAY_SIZE(tz1090_pdc_groups); ++group)
+ if (!strcmp(tz1090_pdc_groups[group].name, pin_group))
+ return group;
+
+ return -EINVAL;
+}
+
+static int add_map_configs(struct device *dev,
+ struct pinctrl_map **map,
+ unsigned int *reserved_maps, unsigned int *num_maps,
+ const char *group, unsigned long *configs,
+ unsigned int num_configs)
+{
+ unsigned long *dup_configs;
+ enum pinctrl_map_type type;
+
+ if (WARN_ON(*num_maps == *reserved_maps))
+ return -ENOSPC;
+
+ dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
+ GFP_KERNEL);
+ if (!dup_configs) {
+ dev_err(dev, "kmemdup(configs) failed\n");
+ return -ENOMEM;
+ }
+
+ /*
+ * We support both pins and pin groups, but we need to figure out which
+ * one we have.
+ */
+ if (get_group_selector(group) >= 0)
+ type = PIN_MAP_TYPE_CONFIGS_GROUP;
+ else
+ type = PIN_MAP_TYPE_CONFIGS_PIN;
+ (*map)[*num_maps].type = type;
+ (*map)[*num_maps].data.configs.group_or_pin = group;
+ (*map)[*num_maps].data.configs.configs = dup_configs;
+ (*map)[*num_maps].data.configs.num_configs = num_configs;
+ (*num_maps)++;
+
+ return 0;
+}
+
+static void tz1090_pdc_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
+ struct pinctrl_map *map,
+ unsigned int num_maps)
+{
+ int i;
+
+ for (i = 0; i < num_maps; i++)
+ if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
+ kfree(map[i].data.configs.configs);
+
+ kfree(map);
+}
+
+static int tz1090_pdc_pinctrl_dt_subnode_to_map(struct device *dev,
+ struct device_node *np,
+ struct pinctrl_map **map,
+ unsigned int *reserved_maps,
+ unsigned int *num_maps)
+{
+ int ret;
+ const char *function;
+ unsigned long *configs = NULL;
+ unsigned int num_configs = 0;
+ unsigned int reserve;
+ struct property *prop;
+ const char *group;
+
+ ret = of_property_read_string(np, "tz1090,function", &function);
+ if (ret < 0) {
+ /* EINVAL=missing, which is fine since it's optional */
+ if (ret != -EINVAL)
+ dev_err(dev,
+ "could not parse property function\n");
+ function = NULL;
+ }
+
+ ret = pinconf_generic_parse_dt_config(np, &configs, &num_configs);
+ if (ret)
+ return ret;
+
+ reserve = 0;
+ if (function != NULL)
+ reserve++;
+ if (num_configs)
+ reserve++;
+ ret = of_property_count_strings(np, "tz1090,pins");
+ if (ret < 0) {
+ dev_err(dev, "could not parse property pins\n");
+ goto exit;
+ }
+ reserve *= ret;
+
+ ret = reserve_map(dev, map, reserved_maps, num_maps, reserve);
+ if (ret < 0)
+ goto exit;
+
+ of_property_for_each_string(np, "tz1090,pins", prop, group) {
+ if (function) {
+ ret = add_map_mux(map, reserved_maps, num_maps,
+ group, function);
+ if (ret < 0)
+ goto exit;
+ }
+
+ if (num_configs) {
+ ret = add_map_configs(dev, map, reserved_maps,
+ num_maps, group, configs,
+ num_configs);
+ if (ret < 0)
+ goto exit;
+ }
+ }
+
+ ret = 0;
+
+exit:
+ kfree(configs);
+ return ret;
+}
+
+static int tz1090_pdc_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np_config,
+ struct pinctrl_map **map,
+ unsigned int *num_maps)
+{
+ unsigned int reserved_maps;
+ struct device_node *np;
+ int ret;
+
+ reserved_maps = 0;
+ *map = NULL;
+ *num_maps = 0;
+
+ for_each_child_of_node(np_config, np) {
+ ret = tz1090_pdc_pinctrl_dt_subnode_to_map(pctldev->dev, np,
+ map, &reserved_maps,
+ num_maps);
+ if (ret < 0) {
+ tz1090_pdc_pinctrl_dt_free_map(pctldev, *map,
+ *num_maps);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static struct pinctrl_ops tz1090_pdc_pinctrl_ops = {
+ .get_groups_count = tz1090_pdc_pinctrl_get_groups_count,
+ .get_group_name = tz1090_pdc_pinctrl_get_group_name,
+ .get_group_pins = tz1090_pdc_pinctrl_get_group_pins,
+#ifdef CONFIG_DEBUG_FS
+ .pin_dbg_show = tz1090_pdc_pinctrl_pin_dbg_show,
+#endif
+ .dt_node_to_map = tz1090_pdc_pinctrl_dt_node_to_map,
+ .dt_free_map = tz1090_pdc_pinctrl_dt_free_map,
+};
+
+/*
+ * Pin mux operations
+ */
+
+static int tz1090_pdc_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
+{
+ return ARRAY_SIZE(tz1090_pdc_functions);
+}
+
+static const char *tz1090_pdc_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
+ unsigned int function)
+{
+ return tz1090_pdc_functions[function].name;
+}
+
+static int tz1090_pdc_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
+ unsigned int function,
+ const char * const **groups,
+ unsigned int * const num_groups)
+{
+ *groups = tz1090_pdc_functions[function].groups;
+ *num_groups = tz1090_pdc_functions[function].ngroups;
+
+ return 0;
+}
+
+/**
+ * tz1090_pdc_pinctrl_mux() - update mux bit
+ * @pmx: Pinmux data
+ * @grp: Pin mux group
+ */
+static void tz1090_pdc_pinctrl_mux(struct tz1090_pdc_pmx *pmx,
+ const struct tz1090_pdc_pingroup *grp)
+{
+ u32 reg, select;
+ unsigned int pin_shift = grp->pins[0];
+ unsigned long flags;
+
+ /* select = mux && !gpio */
+ select = ((pmx->mux_en & ~pmx->gpio_en) >> pin_shift) & 1;
+
+ /* set up the mux */
+ __global_lock2(flags);
+ reg = pmx_read(pmx, grp->reg);
+ reg &= ~BIT(grp->bit);
+ reg |= select << grp->bit;
+ pmx_write(pmx, reg, grp->reg);
+ __global_unlock2(flags);
+}
+
+static int tz1090_pdc_pinctrl_enable(struct pinctrl_dev *pctldev,
+ unsigned int function, unsigned int group)
+{
+ struct tz1090_pdc_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ const struct tz1090_pdc_pingroup *grp = &tz1090_pdc_groups[group];
+
+ dev_dbg(pctldev->dev, "%s(func=%u (%s), group=%u (%s))\n",
+ __func__,
+ function, tz1090_pdc_functions[function].name,
+ group, tz1090_pdc_groups[group].name);
+
+ /* is it even a mux? */
+ if (grp->drv)
+ return -EINVAL;
+
+ /* does this group even control the function? */
+ if (function != grp->func)
+ return -EINVAL;
+
+ /* record the pin being muxed and update mux bit */
+ spin_lock(&pmx->lock);
+ pmx->mux_en |= BIT(grp->pins[0]);
+ tz1090_pdc_pinctrl_mux(pmx, grp);
+ spin_unlock(&pmx->lock);
+ return 0;
+}
+
+static void tz1090_pdc_pinctrl_disable(struct pinctrl_dev *pctldev,
+ unsigned int function,
+ unsigned int group)
+{
+ struct tz1090_pdc_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ const struct tz1090_pdc_pingroup *grp = &tz1090_pdc_groups[group];
+
+ dev_dbg(pctldev->dev, "%s(func=%u (%s), group=%u (%s))\n",
+ __func__,
+ function, tz1090_pdc_functions[function].name,
+ group, tz1090_pdc_groups[group].name);
+
+ /* is it even a mux? */
+ if (grp->drv)
+ return;
+
+ /* does this group even control the function? */
+ if (function != grp->func)
+ return;
+
+ /* record the pin being unmuxed and update mux bit */
+ spin_lock(&pmx->lock);
+ pmx->mux_en &= ~BIT(grp->pins[0]);
+ tz1090_pdc_pinctrl_mux(pmx, grp);
+ spin_unlock(&pmx->lock);
+}
+
+static const struct tz1090_pdc_pingroup *find_mux_group(
+ struct tz1090_pdc_pmx *pmx,
+ unsigned int pin)
+{
+ const struct tz1090_pdc_pingroup *grp;
+ unsigned int group;
+
+ grp = tz1090_pdc_groups;
+ for (group = 0; group < ARRAY_SIZE(tz1090_pdc_groups); ++group, ++grp) {
+ /* only match muxes */
+ if (grp->drv)
+ continue;
+
+ /* with a matching pin */
+ if (grp->pins[0] == pin)
+ return grp;
+ }
+
+ return NULL;
+}
+
+static int tz1090_pdc_pinctrl_gpio_request_enable(
+ struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned int pin)
+{
+ struct tz1090_pdc_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ const struct tz1090_pdc_pingroup *grp = find_mux_group(pmx, pin);
+
+ if (grp) {
+ /* record the pin in GPIO use and update mux bit */
+ spin_lock(&pmx->lock);
+ pmx->gpio_en |= BIT(pin);
+ tz1090_pdc_pinctrl_mux(pmx, grp);
+ spin_unlock(&pmx->lock);
+ }
+ return 0;
+}
+
+static void tz1090_pdc_pinctrl_gpio_disable_free(
+ struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned int pin)
+{
+ struct tz1090_pdc_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ const struct tz1090_pdc_pingroup *grp = find_mux_group(pmx, pin);
+
+ if (grp) {
+ /* record the pin not in GPIO use and update mux bit */
+ spin_lock(&pmx->lock);
+ pmx->gpio_en &= ~BIT(pin);
+ tz1090_pdc_pinctrl_mux(pmx, grp);
+ spin_unlock(&pmx->lock);
+ }
+}
+
+static struct pinmux_ops tz1090_pdc_pinmux_ops = {
+ .get_functions_count = tz1090_pdc_pinctrl_get_funcs_count,
+ .get_function_name = tz1090_pdc_pinctrl_get_func_name,
+ .get_function_groups = tz1090_pdc_pinctrl_get_func_groups,
+ .enable = tz1090_pdc_pinctrl_enable,
+ .disable = tz1090_pdc_pinctrl_disable,
+ .gpio_request_enable = tz1090_pdc_pinctrl_gpio_request_enable,
+ .gpio_disable_free = tz1090_pdc_pinctrl_gpio_disable_free,
+};
+
+/*
+ * Pin config operations
+ */
+
+static int tz1090_pdc_pinconf_reg(struct pinctrl_dev *pctldev,
+ unsigned int pin,
+ enum pin_config_param param,
+ bool report_err,
+ u32 *reg, u32 *width, u32 *mask, u32 *shift,
+ u32 *val)
+{
+ /* Find information about parameter's register */
+ switch (param) {
+ case PIN_CONFIG_BIAS_DISABLE:
+ case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
+ *val = REG_PU_PD_TRISTATE;
+ break;
+ case PIN_CONFIG_BIAS_PULL_UP:
+ *val = REG_PU_PD_UP;
+ break;
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ *val = REG_PU_PD_DOWN;
+ break;
+ case PIN_CONFIG_BIAS_BUS_HOLD:
+ *val = REG_PU_PD_REPEATER;
+ break;
+ default:
+ return -ENOTSUPP;
+ };
+
+ /* Only input bias parameters supported */
+ *reg = REG_GPIO_CONTROL2;
+ *shift = REG_GPIO_CONTROL2_PU_PD_S + pin*2;
+ *width = 2;
+
+ /* Calculate field information */
+ *mask = (BIT(*width) - 1) << *shift;
+
+ return 0;
+}
+
+static int tz1090_pdc_pinconf_get(struct pinctrl_dev *pctldev,
+ unsigned int pin, unsigned long *config)
+{
+ struct tz1090_pdc_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ enum pin_config_param param = pinconf_to_config_param(*config);
+ int ret;
+ u32 reg, width, mask, shift, val, tmp, arg;
+
+ /* Get register information */
+ ret = tz1090_pdc_pinconf_reg(pctldev, pin, param, true,
+ &reg, &width, &mask, &shift, &val);
+ if (ret < 0)
+ return ret;
+
+ /* Extract field from register */
+ tmp = pmx_read(pmx, reg);
+ arg = ((tmp & mask) >> shift) == val;
+
+ /* Config not active */
+ if (!arg)
+ return -EINVAL;
+
+ /* And pack config */
+ *config = pinconf_to_config_packed(param, arg);
+
+ return 0;
+}
+
+static int tz1090_pdc_pinconf_set(struct pinctrl_dev *pctldev,
+ unsigned int pin, unsigned long config)
+{
+ struct tz1090_pdc_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ enum pin_config_param param = pinconf_to_config_param(config);
+ unsigned int arg = pinconf_to_config_argument(config);
+ int ret;
+ u32 reg, width, mask, shift, val, tmp;
+ unsigned long flags;
+
+ dev_dbg(pctldev->dev, "%s(pin=%s, config=%#lx)\n",
+ __func__, tz1090_pdc_pins[pin].name, config);
+
+ /* Get register information */
+ ret = tz1090_pdc_pinconf_reg(pctldev, pin, param, true,
+ &reg, &width, &mask, &shift, &val);
+ if (ret < 0)
+ return ret;
+
+ /* Unpack argument and range check it */
+ if (arg > 1) {
+ dev_dbg(pctldev->dev, "%s: arg %u out of range\n",
+ __func__, arg);
+ return -EINVAL;
+ }
+
+ /* Write register field */
+ __global_lock2(flags);
+ tmp = pmx_read(pmx, reg);
+ tmp &= ~mask;
+ if (arg)
+ tmp |= val << shift;
+ pmx_write(pmx, tmp, reg);
+ __global_unlock2(flags);
+
+ return 0;
+}
+
+static const int tz1090_pdc_boolean_map[] = {
+ [0] = -EINVAL,
+ [1] = 1,
+};
+
+static const int tz1090_pdc_dr_map[] = {
+ [REG_DR_2mA] = 2,
+ [REG_DR_4mA] = 4,
+ [REG_DR_8mA] = 8,
+ [REG_DR_12mA] = 12,
+};
+
+static int tz1090_pdc_pinconf_group_reg(struct pinctrl_dev *pctldev,
+ const struct tz1090_pdc_pingroup *g,
+ enum pin_config_param param,
+ bool report_err, u32 *reg, u32 *width,
+ u32 *mask, u32 *shift, const int **map)
+{
+ /* Drive configuration applies in groups, but not to all groups. */
+ if (!g->drv) {
+ if (report_err)
+ dev_dbg(pctldev->dev,
+ "%s: group %s has no drive control\n",
+ __func__, g->name);
+ return -ENOTSUPP;
+ }
+
+ /* Find information about drive parameter's register */
+ *reg = REG_GPIO_CONTROL2;
+ switch (param) {
+ case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
+ *shift = REG_GPIO_CONTROL2_PDC_SCHMITT_S;
+ *width = 1;
+ *map = tz1090_pdc_boolean_map;
+ break;
+ case PIN_CONFIG_SLEW_RATE:
+ *shift = REG_GPIO_CONTROL2_PDC_SR_S;
+ *width = 1;
+ *map = tz1090_pdc_boolean_map;
+ break;
+ case PIN_CONFIG_DRIVE_STRENGTH:
+ *shift = REG_GPIO_CONTROL2_PDC_DR_S;
+ *width = 2;
+ *map = tz1090_pdc_dr_map;
+ break;
+ case PIN_CONFIG_LOW_POWER_MODE:
+ *shift = REG_GPIO_CONTROL2_PDC_POS_S;
+ *width = 1;
+ *map = tz1090_pdc_boolean_map;
+ break;
+ default:
+ return -ENOTSUPP;
+ };
+
+ /* Calculate field information */
+ *mask = (BIT(*width) - 1) << *shift;
+
+ return 0;
+}
+
+static int tz1090_pdc_pinconf_group_get(struct pinctrl_dev *pctldev,
+ unsigned int group,
+ unsigned long *config)
+{
+ struct tz1090_pdc_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ const struct tz1090_pdc_pingroup *g = &tz1090_pdc_groups[group];
+ enum pin_config_param param = pinconf_to_config_param(*config);
+ int ret, arg;
+ u32 reg, width, mask, shift, val;
+ const int *map;
+
+ /* Get register information */
+ ret = tz1090_pdc_pinconf_group_reg(pctldev, g, param, true,
+ &reg, &width, &mask, &shift, &map);
+ if (ret < 0)
+ return ret;
+
+ /* Extract field from register */
+ val = pmx_read(pmx, reg);
+ arg = map[(val & mask) >> shift];
+ if (arg < 0)
+ return arg;
+
+ /* And pack config */
+ *config = pinconf_to_config_packed(param, arg);
+
+ return 0;
+}
+
+static int tz1090_pdc_pinconf_group_set(struct pinctrl_dev *pctldev,
+ unsigned int group,
+ unsigned long config)
+{
+ struct tz1090_pdc_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ const struct tz1090_pdc_pingroup *g = &tz1090_pdc_groups[group];
+ enum pin_config_param param = pinconf_to_config_param(config);
+ const unsigned int *pit;
+ unsigned int i;
+ int ret, arg;
+ u32 reg, width, mask, shift, val;
+ unsigned long flags;
+ const int *map;
+
+ dev_dbg(pctldev->dev, "%s(group=%s, config=%#lx)\n",
+ __func__, g->name, config);
+
+ /* Get register information */
+ ret = tz1090_pdc_pinconf_group_reg(pctldev, g, param, true,
+ &reg, &width, &mask, &shift, &map);
+ if (ret < 0) {
+ /*
+ * Maybe we're trying to set a per-pin configuration of a group,
+ * so do the pins one by one. This is mainly as a convenience.
+ */
+ for (i = 0, pit = g->pins; i < g->npins; ++i, ++pit) {
+ ret = tz1090_pdc_pinconf_set(pctldev, *pit, config);
+ if (ret)
+ return ret;
+ }
+ return 0;
+ }
+
+ /* Unpack argument and map it to register value */
+ arg = pinconf_to_config_argument(config);
+ for (i = 0; i < BIT(width); ++i) {
+ if (map[i] == arg || (map[i] == -EINVAL && !arg)) {
+ /* Write register field */
+ __global_lock2(flags);
+ val = pmx_read(pmx, reg);
+ val &= ~mask;
+ val |= i << shift;
+ pmx_write(pmx, val, reg);
+ __global_unlock2(flags);
+ return 0;
+ }
+ }
+
+ dev_dbg(pctldev->dev, "%s: arg %u not supported\n",
+ __func__, arg);
+ return 0;
+}
+
+static struct pinconf_ops tz1090_pdc_pinconf_ops = {
+ .is_generic = true,
+ .pin_config_get = tz1090_pdc_pinconf_get,
+ .pin_config_set = tz1090_pdc_pinconf_set,
+ .pin_config_group_get = tz1090_pdc_pinconf_group_get,
+ .pin_config_group_set = tz1090_pdc_pinconf_group_set,
+ .pin_config_config_dbg_show = pinconf_generic_dump_config,
+};
+
+/*
+ * Pin control driver setup
+ */
+
+static struct pinctrl_desc tz1090_pdc_pinctrl_desc = {
+ .pctlops = &tz1090_pdc_pinctrl_ops,
+ .pmxops = &tz1090_pdc_pinmux_ops,
+ .confops = &tz1090_pdc_pinconf_ops,
+ .owner = THIS_MODULE,
+};
+
+static int tz1090_pdc_pinctrl_probe(struct platform_device *pdev)
+{
+ struct tz1090_pdc_pmx *pmx;
+ struct resource *res;
+
+ pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
+ if (!pmx) {
+ dev_err(&pdev->dev, "Can't alloc tz1090_pdc_pmx\n");
+ return -ENOMEM;
+ }
+ pmx->dev = &pdev->dev;
+ spin_lock_init(&pmx->lock);
+
+ tz1090_pdc_pinctrl_desc.name = dev_name(&pdev->dev);
+ tz1090_pdc_pinctrl_desc.pins = tz1090_pdc_pins;
+ tz1090_pdc_pinctrl_desc.npins = ARRAY_SIZE(tz1090_pdc_pins);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "Missing MEM resource\n");
+ return -ENODEV;
+ }
+
+ if (!devm_request_mem_region(&pdev->dev, res->start,
+ resource_size(res),
+ dev_name(&pdev->dev))) {
+ dev_err(&pdev->dev,
+ "Couldn't request MEM resource\n");
+ return -ENODEV;
+ }
+
+ pmx->regs = devm_ioremap(&pdev->dev, res->start,
+ resource_size(res));
+ if (!pmx->regs) {
+ dev_err(&pdev->dev, "Couldn't ioremap regs\n");
+ return -ENODEV;
+ }
+
+ pmx->pctl = pinctrl_register(&tz1090_pdc_pinctrl_desc, &pdev->dev, pmx);
+ if (!pmx->pctl) {
+ dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
+ return -ENODEV;
+ }
+
+ platform_set_drvdata(pdev, pmx);
+
+ dev_info(&pdev->dev, "TZ1090 PDC pinctrl driver initialised\n");
+
+ return 0;
+}
+
+static int tz1090_pdc_pinctrl_remove(struct platform_device *pdev)
+{
+ struct tz1090_pdc_pmx *pmx = platform_get_drvdata(pdev);
+
+ pinctrl_unregister(pmx->pctl);
+
+ return 0;
+}
+
+static struct of_device_id tz1090_pdc_pinctrl_of_match[] = {
+ { .compatible = "img,tz1090-pdc-pinctrl", },
+ { },
+};
+
+static struct platform_driver tz1090_pdc_pinctrl_driver = {
+ .driver = {
+ .name = "tz1090-pdc-pinctrl",
+ .owner = THIS_MODULE,
+ .of_match_table = tz1090_pdc_pinctrl_of_match,
+ },
+ .probe = tz1090_pdc_pinctrl_probe,
+ .remove = tz1090_pdc_pinctrl_remove,
+};
+
+static int __init tz1090_pdc_pinctrl_init(void)
+{
+ return platform_driver_register(&tz1090_pdc_pinctrl_driver);
+}
+arch_initcall(tz1090_pdc_pinctrl_init);
+
+static void __exit tz1090_pdc_pinctrl_exit(void)
+{
+ platform_driver_unregister(&tz1090_pdc_pinctrl_driver);
+}
+module_exit(tz1090_pdc_pinctrl_exit);
+
+MODULE_AUTHOR("Imagination Technologies Ltd.");
+MODULE_DESCRIPTION("Toumaz Xenif TZ1090 PDC pinctrl driver");
+MODULE_LICENSE("GPL v2");
+MODULE_DEVICE_TABLE(of, tz1090_pdc_pinctrl_of_match);
--
1.8.1.2


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