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Subject[PATCH 2/2] pinctrl: Add simple pinmux driver using device tree data
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Add simple pinmux driver using device tree data.

Currently this driver only works on omap2+ series of
processors, where there is either an 8 or 16-bit mux
register for each pin. Support for other similar pinmux
controllers could be added.

Note that this patch does not yet support pinconf_ops
or GPIO. Further, alternative mux modes are not yet
handled.

Signed-off-by: Tony Lindgren <tony@atomide.com>
---
.../devicetree/bindings/pinmux/pinctrl-simple.txt | 62 +
drivers/pinctrl/Kconfig | 6
drivers/pinctrl/Makefile | 1
drivers/pinctrl/pinctrl-simple.c | 1286 ++++++++++++++++++++
4 files changed, 1355 insertions(+), 0 deletions(-)
create mode 100644 Documentation/devicetree/bindings/pinmux/pinctrl-simple.txt
create mode 100644 drivers/pinctrl/pinctrl-simple.c
diff --git a/Documentation/devicetree/bindings/pinmux/pinctrl-simple.txt b/Documentation/devicetree/bindings/pinmux/pinctrl-simple.txt
new file mode 100644
index 0000000..ca1a48d
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinmux/pinctrl-simple.txt
@@ -0,0 +1,62 @@
+Generic simple device tree based pinmux driver
+
+Required properties:
+- compatible : one of:
+ - "pinctrl-simple"
+ - "ti,omap2420-pinmux"
+ - "ti,omap2430-pinmux"
+ - "ti,omap3-pinmux"
+ - "ti,omap4-pinmux"
+- reg : offset and length of the register set for the mux registers
+- #pinmux-cells : width of the pinmux array, currently only 2 is supported
+- pinctrl-simple,register-width : pinmux register access width
+- pinctrl-simple,function-mask : mask of allowed pinmux function bits
+- pinctrl-simple,function-off : function off mode for disabled state
+- pinctrl-simple,pinconf-mask : mask of allowed pinconf bits
+
+Example:
+
+ /* SoC common file, such as omap4.dtsi */
+ omap4_pmx_core: pinmux@4a100040 {
+ compatible = "ti,omap4-pinmux";
+ reg = <0x4a100040 0x0196>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ #pinmux-cells = <2>;
+ pinctrl-simple,register-width = <16>;
+ pinctrl-simple,function-mask = <0x7>;
+ pinctrl-simple,function-off = <0x7>;
+ pinctrl-simple,pinconf-mask = <0xfff8>;
+ };
+
+ omap4_pmx_wkup: pinmux@4a31e040 {
+ compatible = "ti,omap4-pinmux";
+ reg = <0x4a31e040 0x0038>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ #pinmux-cells = <2>;
+ pinctrl-simple,register-width = <16>;
+ pinctrl-simple,function-mask = <0x7>;
+ pinctrl-simple,function-off = <0x7>;
+ pinctrl-simple,pinconf-mask = <0xfff8>;
+ };
+
+ uart3: serial@48020000 {
+ compatible = "ti,omap4-uart";
+ ti,hwmods = "uart3";
+ clock-frequency = <48000000>;
+ }
+
+ /* board specific .dts file, such as omap4-sdp.dts */
+ pinmux@4a100040 {
+ pmx_uart3: pinconfig-uart3 {
+ mux = <0x0104 0x100
+ 0x0106 0x0>;
+ };
+ };
+ };
+
+ serial@48020000 {
+ pinctrl = <&pmx_uart3>;
+ };
+
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index afaf885..73848b1 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -42,6 +42,12 @@ config PINCTRL_COH901
COH 901 335 and COH 901 571/3. They contain 3, 5 or 7
ports of 8 GPIO pins each.

+config PINCTRL_SIMPLE
+ tristate "Simple device tree based pinmux driver"
+ depends on OF
+ help
+ This selects the device tree based generic pinmux driver.
+
endmenu

endif
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index 827601c..4b05649 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_PINCONF) += pinconf.o
obj-$(CONFIG_PINCTRL_SIRF) += pinctrl-sirf.o
obj-$(CONFIG_PINCTRL_U300) += pinctrl-u300.o
obj-$(CONFIG_PINCTRL_COH901) += pinctrl-coh901.o
+obj-$(CONFIG_PINCTRL_SIMPLE) += pinctrl-simple.o
diff --git a/drivers/pinctrl/pinctrl-simple.c b/drivers/pinctrl/pinctrl-simple.c
new file mode 100644
index 0000000..370e0c3
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-simple.c
@@ -0,0 +1,1286 @@
+/*
+ * Generic simple device tree based pinmux driver
+ *
+ * Copyright (C) 2012 Texas Instruments, Inc.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/list.h>
+
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/machine.h>
+
+#include "core.h"
+
+#define PMX_MUX_NAME "mux"
+#define PMX_PINCTRL_NAME "pinctrl"
+#define PMX_MUX_CELLS "#pinmux-cells"
+#define DRIVER_NAME "pictrl-simple"
+#define REG_NAME_LEN (sizeof(unsigned long) + 1)
+
+static LIST_HEAD(smux_maps); /* Global device to pinmux map */
+static LIST_HEAD(smux_pingroups); /* Global list of pingroups */
+static LIST_HEAD(smux_functions); /* Global list of functions */
+static DEFINE_MUTEX(smux_mutex);
+
+/**
+ * struct smux_pingroup - pingroups for a function
+ * @smux: pinmux controller instance
+ * @np: pinggroup device node pointer
+ * @name: pingroup name
+ * @gpins: array of the pins in the group
+ * @ngpins: number of pins in the group
+ */
+struct smux_pingroup {
+ struct smux_device *smux;
+ struct device_node *np;
+ char *name;
+ int *gpins;
+ int ngpins;
+ struct list_head node;
+};
+
+/**
+ * struct smux_func_vals - mux function register offset and default value pair
+ * @reg: register virtual address
+ * @defval: default value
+ */
+struct smux_func_vals {
+ void __iomem *reg;
+ unsigned defval;
+};
+
+/**
+ * struct smux_function - pinmux function
+ * @smux: pinmux controller instance
+ * @np: mux device node pointer
+ * @name: pinmux function name
+ * @vals: register and default values array
+ * @nvals: number of entries in vals array
+ * @pgnames: array of pingroup names the function uses
+ * @npgnames: number of pingroup names the function uses
+ * @node: list node
+ *
+ * Note that np is needed to match pinctrl entry to mux entry.
+ */
+struct smux_function {
+ struct smux_device *smux;
+ struct device_node *np;
+ char *name;
+ struct smux_func_vals *vals;
+ unsigned nvals;
+ const char **pgnames;
+ int npgnames;
+ struct list_head node;
+};
+
+/**
+ * struct smux_map - wrapper for device to pinmux map
+ * @smux: pinmux controller instance
+ * @map: device to pinmux map
+ * @node: list node
+ */
+struct smux_map {
+ struct smux_device *smux;
+ struct pinmux_map map;
+ struct list_head node;
+};
+
+/**
+ * struct smux_data - data arrays needed by pinctrl framework
+ * @pa: pindesc array
+ * @ma: pinmap array
+ * @cur: index to current element
+ * @max: last element in the array
+ *
+ */
+struct smux_data {
+ union {
+ struct pinctrl_pin_desc *pa;
+ struct pinmux_map *ma;
+ };
+ int cur;
+ int max;
+};
+
+/**
+ * struct smux_device - mux device instance
+ * @res: resources
+ * @base: virtual address of the controller
+ * @size: size of the ioremapped area
+ * @dev: device entry
+ * @pctl: pin controller device
+ * @width: bits per mux register
+ * @fmask: function register mask
+ * @fshift: function register shift
+ * @foff: value to turn mux off
+ * @cmask: pinconf mask
+ * @fmax: max number of functions in fmask
+ * @cells: width of the mux array
+ * @names: array of register names for pins
+ * @pins: physical pins on the SoC
+ * @maps: device to mux function mappings
+ * @pgtree: pingroup index radix tree
+ * @ftree: function index radix tree
+ * @ngroups: number of pingroups
+ * @nfuncs: number of functions
+ * @pctlops: pin controller functions
+ * @pmxops: pin mux functions
+ * @desc: pin controller descriptor
+ * @read: register read function to use
+ * @write: register write function to use
+ */
+struct smux_device {
+ struct resource *res;
+ void __iomem *base;
+ unsigned size;
+ struct device *dev;
+ struct pinctrl_dev *pctl;
+
+ unsigned width;
+ unsigned fmask;
+ unsigned fshift;
+ unsigned foff;
+ unsigned cmask;
+ unsigned fmax;
+ unsigned cells;
+
+ char *names;
+ struct smux_data pins;
+ struct smux_data maps;
+ struct radix_tree_root pgtree;
+ struct radix_tree_root ftree;
+ unsigned ngroups;
+ unsigned nfuncs;
+
+ struct pinctrl_ops *pctlops;
+ struct pinmux_ops *pmxops;
+ struct pinctrl_desc *desc;
+
+ unsigned (*read)(void __iomem *reg);
+ void (*write)(unsigned val, void __iomem *reg);
+};
+
+static unsigned __maybe_unused smux_readb(void __iomem *reg)
+{
+ return readb(reg);
+}
+
+static unsigned __maybe_unused smux_readw(void __iomem *reg)
+{
+ return readw(reg);
+}
+
+static unsigned __maybe_unused smux_readl(void __iomem *reg)
+{
+ return readl(reg);
+}
+
+static void __maybe_unused smux_writeb(unsigned val, void __iomem *reg)
+{
+ writeb(val, reg);
+}
+
+static void __maybe_unused smux_writew(unsigned val, void __iomem *reg)
+{
+ writew(val, reg);
+}
+
+static void __maybe_unused smux_writel(unsigned val, void __iomem *reg)
+{
+ writel(val, reg);
+}
+
+static int smux_list_groups(struct pinctrl_dev *pctldev, unsigned gselector)
+{
+ struct smux_device *smux;
+
+ smux = pinctrl_dev_get_drvdata(pctldev);
+ if (gselector >= smux->ngroups)
+ return -EINVAL;
+
+ return 0;
+}
+
+static const char *smux_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned gselector)
+{
+ struct smux_device *smux;
+ struct smux_pingroup *group;
+
+ smux = pinctrl_dev_get_drvdata(pctldev);
+ group = radix_tree_lookup(&smux->pgtree, gselector);
+ if (!group) {
+ dev_err(smux->dev, "%s could not find pingroup%i\n",
+ __func__, gselector);
+ return NULL;
+ }
+
+ return group->name;
+}
+
+static int smux_get_group_pins(struct pinctrl_dev *pctldev,
+ unsigned gselector,
+ const unsigned **pins,
+ unsigned *npins)
+{
+ struct smux_device *smux;
+ struct smux_pingroup *group;
+
+ smux = pinctrl_dev_get_drvdata(pctldev);
+ group = radix_tree_lookup(&smux->pgtree, gselector);
+ if (!group) {
+ dev_err(smux->dev, "%s could not find pingroup%i\n",
+ __func__, gselector);
+ return -EINVAL;
+ }
+
+ *pins = group->gpins;
+ *npins = group->ngpins;
+
+ return 0;
+}
+
+static void smux_pin_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s,
+ unsigned offset)
+{
+ seq_printf(s, " " DRIVER_NAME);
+}
+
+static struct pinctrl_ops smux_pinctrl_ops = {
+ .list_groups = smux_list_groups,
+ .get_group_name = smux_get_group_name,
+ .get_group_pins = smux_get_group_pins,
+ .pin_dbg_show = smux_pin_dbg_show,
+};
+
+static int smux_list_functions(struct pinctrl_dev *pctldev, unsigned fselector)
+{
+ struct smux_device *smux;
+
+ smux = pinctrl_dev_get_drvdata(pctldev);
+ if (fselector >= smux->nfuncs)
+ return -EINVAL;
+
+ return 0;
+}
+
+static const char *smux_get_function_name(struct pinctrl_dev *pctldev,
+ unsigned fselector)
+{
+ struct smux_device *smux;
+ struct smux_function *func;
+
+ smux = pinctrl_dev_get_drvdata(pctldev);
+ func = radix_tree_lookup(&smux->ftree, fselector);
+ if (!func) {
+ dev_err(smux->dev, "%s could not find function%i\n",
+ __func__, fselector);
+ return NULL;
+ }
+
+ return func->name;
+}
+
+static int smux_get_function_groups(struct pinctrl_dev *pctldev,
+ unsigned fselector,
+ const char * const **groups,
+ unsigned * const ngroups)
+{
+ struct smux_device *smux;
+ struct smux_function *func;
+
+ smux = pinctrl_dev_get_drvdata(pctldev);
+ func = radix_tree_lookup(&smux->ftree, fselector);
+ if (!func) {
+ dev_err(smux->dev, "%s could not find function%i\n",
+ __func__, fselector);
+ return -EINVAL;
+ }
+ *groups = func->pgnames;
+ *ngroups = func->npgnames;
+
+ return 0;
+}
+
+static int smux_enable(struct pinctrl_dev *pctldev, unsigned fselector,
+ unsigned group)
+{
+ struct smux_device *smux;
+ struct smux_function *func;
+ int i;
+
+ smux = pinctrl_dev_get_drvdata(pctldev);
+ func = radix_tree_lookup(&smux->ftree, fselector);
+ if (!func)
+ return -EINVAL;
+
+ dev_dbg(smux->dev, "enabling function%i %s\n",
+ fselector, func->name);
+
+ for (i = 0; i < func->nvals; i++) {
+ struct smux_func_vals *vals;
+ unsigned val;
+
+ vals = &func->vals[i];
+ val = smux->read(vals->reg);
+ val &= ~(smux->cmask | smux->fmask);
+ val |= vals->defval;
+ smux->write(val, vals->reg);
+ }
+
+ return 0;
+}
+
+/*
+ * REVISIT: We may not always have a single disable value for a register,
+ * but this can be handled with alternative modes once the DT binding is
+ * available for those.
+ */
+static void smux_disable(struct pinctrl_dev *pctldev, unsigned fselector,
+ unsigned group)
+{
+ struct smux_device *smux;
+ struct smux_function *func;
+ int i;
+
+ smux = pinctrl_dev_get_drvdata(pctldev);
+ func = radix_tree_lookup(&smux->ftree, fselector);
+ if (!func) {
+ dev_err(smux->dev, "%s could not find function%i\n",
+ __func__, fselector);
+ return;
+ }
+
+ dev_dbg(smux->dev, "disabling function%i %s\n",
+ fselector, func->name);
+
+ for (i = 0; i < func->nvals; i++) {
+ struct smux_func_vals *vals;
+ unsigned val;
+
+ vals = &func->vals[i];
+ val = smux->read(vals->reg);
+ val &= ~(smux->cmask | smux->fmask);
+ val |= smux->foff << smux->fshift;
+ smux->write(val, vals->reg);
+ }
+}
+
+static int smux_request_gpio(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range, unsigned offset)
+{
+ return -ENOTSUPP;
+}
+
+static struct pinmux_ops smux_pinmux_ops = {
+ .list_functions = smux_list_functions,
+ .get_function_name = smux_get_function_name,
+ .get_function_groups = smux_get_function_groups,
+ .enable = smux_enable,
+ .disable = smux_disable,
+ .gpio_request_enable = smux_request_gpio,
+};
+
+static int smux_pinconf_get(struct pinctrl_dev *pctldev,
+ unsigned pin, unsigned long *config)
+{
+ return -ENOTSUPP;
+}
+
+static int smux_pinconf_set(struct pinctrl_dev *pctldev,
+ unsigned pin, unsigned long config)
+{
+ return -ENOTSUPP;
+}
+
+static int smux_pinconf_group_get(struct pinctrl_dev *pctldev,
+ unsigned group, unsigned long *config)
+{
+ return -ENOTSUPP;
+}
+
+static int smux_pinconf_group_set(struct pinctrl_dev *pctldev,
+ unsigned group, unsigned long config)
+{
+ return -ENOTSUPP;
+}
+
+static void smux_pinconf_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s, unsigned offset)
+{
+}
+
+static void smux_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s, unsigned selector)
+{
+}
+
+static struct pinconf_ops smux_pinconf_ops = {
+ .pin_config_get = smux_pinconf_get,
+ .pin_config_set = smux_pinconf_set,
+ .pin_config_group_get = smux_pinconf_group_get,
+ .pin_config_group_set = smux_pinconf_group_set,
+ .pin_config_dbg_show = smux_pinconf_dbg_show,
+ .pin_config_group_dbg_show = smux_pinconf_group_dbg_show,
+};
+
+static struct pinctrl_desc smux_pinctrl_desc = {
+ .name = DRIVER_NAME,
+ .pctlops = &smux_pinctrl_ops,
+ .pmxops = &smux_pinmux_ops,
+ .confops = &smux_pinconf_ops,
+ .owner = THIS_MODULE,
+};
+
+/**
+ * smux_add_pin() - add a pin to the static per controller pin array
+ * @smux: smux driver instance
+ * @offset: register offset from base
+ */
+static int __init smux_add_pin(struct smux_device *smux, unsigned offset)
+{
+ struct pinctrl_pin_desc *pin;
+ char *name;
+ int i;
+
+ i = smux->pins.cur;
+ if (i > smux->pins.max + 1) {
+ dev_err(smux->dev, "too many pins, max %i\n",
+ smux->pins.max);
+ return -ENOMEM;
+ }
+
+ pin = &smux->pins.pa[i];
+ name = &smux->names[i];
+ sprintf(name, "%lx",
+ (unsigned long)smux->res->start + offset);
+ pin->name = name;
+ pin->number = i;
+ smux->pins.cur++;
+
+ return i;
+}
+
+/**
+ * smux_allocate_pin_table() - adds all the pins for the pinmux controller
+ * @smux: smux driver instance
+ *
+ * In case of errors, resources are freed in smux_free_resources.
+ */
+static int __init smux_allocate_pin_table(struct smux_device *smux)
+{
+ int mux_bytes, i;
+
+ mux_bytes = smux->width / BITS_PER_BYTE;
+ smux->pins.max = smux->size / mux_bytes;
+
+ dev_dbg(smux->dev, "allocating %i muxable pins\n",
+ smux->pins.max);
+ smux->pins.pa = devm_kzalloc(smux->dev,
+ sizeof(*smux->pins.pa) * smux->pins.max,
+ GFP_KERNEL);
+ if (!smux->pins.pa)
+ return -ENOMEM;
+
+ smux->names = devm_kzalloc(smux->dev,
+ REG_NAME_LEN * smux->pins.max,
+ GFP_KERNEL);
+ if (!smux->names)
+ return -ENOMEM;
+
+ smux->desc->pins = smux->pins.pa;
+ smux->desc->npins = smux->pins.max--;
+
+ for (i = 0; i <= smux->desc->npins; i++) {
+ unsigned offset;
+ int res;
+
+ offset = i * mux_bytes;
+ res = smux_add_pin(smux, offset);
+ if (res < 0) {
+ dev_err(smux->dev, "error adding pins: %i\n", res);
+ return res;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * smux_add_function() - adds a new function to the function list
+ * @smux: smux driver instance
+ * @np: device node of the mux entry
+ * @name: name of the function
+ * @vals: array of mux register value pairs used by the function
+ * @nvals: number of mux register value pairs
+ * @pgnames: array of pingroup names for the function
+ * @npgnames: number of pingroup names
+ */
+static int __init smux_add_function(struct smux_device *smux,
+ struct device_node *np,
+ const char *name,
+ struct smux_func_vals *vals,
+ unsigned nvals,
+ const char **pgnames,
+ unsigned npgnames)
+{
+ struct smux_function *function;
+
+ function = devm_kzalloc(smux->dev, sizeof(*function), GFP_KERNEL);
+ if (!function)
+ return -ENOMEM;
+
+ function->name = kstrdup(name, GFP_KERNEL);
+ if (!function->name) {
+ devm_kfree(smux->dev, function);
+ return -ENOMEM;
+ }
+
+ function->np = np;
+ function->smux = smux;
+ function->vals = vals;
+ function->nvals = nvals;
+ function->pgnames = pgnames;
+ function->npgnames = npgnames;
+
+ mutex_lock(&smux_mutex);
+ list_add_tail(&function->node, &smux_functions);
+ radix_tree_insert(&smux->ftree, smux->nfuncs, function);
+ smux->nfuncs++;
+ mutex_unlock(&smux_mutex);
+
+ return 0;
+}
+
+/**
+ * smux_add_pingroup() - add a pingroup to the pingroup list
+ * @smux: smux driver instance
+ * @np: device node of the mux entry
+ * @name: name of the pingroup
+ * @gpins: array of the pins that belong to the group
+ * @ngpins: number of pins in the group
+ */
+static int __init smux_add_pingroup(struct smux_device *smux,
+ struct device_node *np,
+ const char *name,
+ int *gpins,
+ int ngpins)
+{
+ struct smux_pingroup *pingroup;
+
+ pingroup = devm_kzalloc(smux->dev, sizeof(*pingroup), GFP_KERNEL);
+ if (!pingroup)
+ return -ENOMEM;
+
+ pingroup->name = kstrdup(name, GFP_KERNEL);
+ if (!pingroup->name) {
+ devm_kfree(smux->dev, pingroup);
+ return -ENOMEM;
+ }
+
+ pingroup->np = np;
+ pingroup->smux = smux;
+ pingroup->gpins = gpins;
+ pingroup->ngpins = ngpins;
+
+ mutex_lock(&smux_mutex);
+ list_add_tail(&pingroup->node, &smux_pingroups);
+ radix_tree_insert(&smux->pgtree, smux->ngroups, pingroup);
+ smux->ngroups++;
+ mutex_unlock(&smux_mutex);
+
+ return 0;
+}
+
+/**
+ * smux_get_pin_by_offset() - get a pin index based on the register offset
+ * @smux: smux driver instance
+ * @offset: register offset from the base
+ *
+ * Note that this is OK for now as the pins are in a static array and
+ * the radix tree number stays the same.
+ */
+static int __init smux_get_pin_by_offset(struct smux_device *smux,
+ unsigned offset)
+{
+ unsigned index;
+
+ if (offset >= smux->size) {
+ dev_err(smux->dev, "mux offset out of range: %04x (%04x)\n",
+ offset, smux->size);
+ return -EINVAL;
+ }
+
+ index = offset / (smux->width / BITS_PER_BYTE);
+
+ return index;
+}
+
+/**
+ * smux_parse_one_pinmux_entry() - parses a device tree mux entry
+ * @smux: smux driver instance
+ * @np: device node of the mux entry
+ *
+ * Note that this currently supports only #pinmux-cells = 2.
+ * This could be improved to parse controllers that have multiple
+ * registers per mux.
+ */
+static int __init smux_parse_one_pinmux_entry(struct smux_device *smux,
+ struct device_node *np)
+{
+ struct smux_func_vals *vals;
+ const __be32 *mux;
+ int size, rows, *pins, index = 0, found = 0, res = -ENOMEM;
+ const char **pgnames;
+
+ if (smux->cells != 2) {
+ dev_err(smux->dev, "unhandled %s: %i\n",
+ PMX_MUX_CELLS,
+ smux->cells);
+ return -EINVAL;
+ }
+
+ mux = of_get_property(np, PMX_MUX_NAME, &size);
+ if ((!mux) || (size < sizeof(*mux) * smux->cells)) {
+ dev_err(smux->dev, "bad data for mux %s\n",
+ np->full_name);
+ return -EINVAL;
+ }
+ size /= sizeof(*mux); /* Number of elements in array */
+ rows = size / smux->cells;
+
+ vals = devm_kzalloc(smux->dev, sizeof(*vals) * rows, GFP_KERNEL);
+ if (!vals)
+ return -ENOMEM;
+
+ pins = devm_kzalloc(smux->dev, sizeof(*pins) * rows, GFP_KERNEL);
+ if (!pins)
+ goto free_vals;
+
+ pgnames = devm_kzalloc(smux->dev, sizeof(*pgnames), GFP_KERNEL);
+ if (!pgnames)
+ goto free_pins;
+
+ while (index < size) {
+ unsigned offset, defval;
+ int pin;
+
+ offset = be32_to_cpup(mux + index++);
+ defval = be32_to_cpup(mux + index++);
+ vals[found].reg = smux->base + offset;
+ vals[found].defval = defval;
+
+ pin = smux_get_pin_by_offset(smux, offset);
+ if (pin < 0) {
+ dev_info(smux->dev,
+ "could not add functions for mux %ux\n",
+ offset);
+ break;
+ }
+ pins[found++] = pin;
+ }
+
+ pgnames[0] = np->name;
+ res = smux_add_function(smux, np, np->name, vals, found, pgnames, 1);
+ if (res < 0)
+ goto free_pgnames;
+
+ res = smux_add_pingroup(smux, np, np->name, pins, found);
+ if (res < 0)
+ goto free_pgnames;
+
+ return 0;
+
+free_pgnames:
+ devm_kfree(smux->dev, pgnames);
+
+free_pins:
+ devm_kfree(smux->dev, pins);
+
+free_vals:
+ devm_kfree(smux->dev, vals);
+
+ return res;
+}
+
+/**
+ * smux_get_function_by_node() - find a function by node
+ * @smux: smux driver instance
+ * @np: device node of the mux entry
+ */
+static struct smux_function *
+__init smux_get_function_by_node(struct smux_device *smux,
+ struct device_node *np)
+{
+ struct smux_function *function;
+
+ mutex_lock(&smux_mutex);
+ list_for_each_entry(function, &smux_functions, node) {
+ if (smux != function->smux)
+ continue;
+
+ if (function->np == np)
+ goto unlock;
+ }
+ function = NULL;
+
+unlock:
+ mutex_unlock(&smux_mutex);
+
+ return function;
+}
+
+/**
+ * smux_rename_function() - renames a function added earlier
+ * @function: existing function
+ * @new_name: new name for the function
+ *
+ * This is needed to avoid adding multiple function entries.
+ * We first parse all the device tree mux entries, and then
+ * parse the device pinconfig entries. This allows us to rename
+ * mux entry to match the device pinconfig naming.
+ */
+static int __init smux_rename_function(struct smux_function *function,
+ const char *new_name)
+{
+ char *name;
+
+ if (!new_name)
+ return -EINVAL;
+
+ name = kstrdup(new_name, GFP_KERNEL);
+ if (!name)
+ return -ENOMEM;
+
+ mutex_lock(&smux_mutex);
+ kfree(function->name);
+ function->name = name;
+ mutex_unlock(&smux_mutex);
+
+ return 0;
+}
+
+/**
+ * smux_add_map() - adds a new map to the map list
+ * @smux: smux driver instance
+ * @np: device node of the mux entry
+ *
+ * Note that pctldev will get populated later on as it is
+ * not available until after pinctrl_register().
+ */
+static int __init smux_add_map(struct smux_device *smux,
+ struct device_node *np)
+{
+ struct platform_device *pdev = NULL;
+ struct smux_map *smap;
+ struct pinmux_map *map;
+ const char *new_name;
+ int ret;
+
+ pdev = of_find_device_by_node(np);
+ new_name = np->full_name;
+
+ mutex_lock(&smux_mutex);
+ list_for_each_entry(smap, &smux_maps, node) {
+ const char *existing_name = smap->map.name;
+
+ if (smap->smux != smux)
+ continue;
+
+ if (!strcmp(new_name, existing_name)) {
+ dev_info(smux->dev, "map already exists for %s\n",
+ existing_name);
+ ret = -EEXIST;
+ goto unlock;
+ }
+ }
+
+ smap = devm_kzalloc(smux->dev, sizeof(*smap), GFP_KERNEL);
+ if (!smap) {
+ ret = -ENOMEM;
+ goto unlock;
+ }
+ smap->smux = smux;
+ if (smux->pctl && smux->pctl->dev)
+ smap->map.ctrl_dev = smux->pctl->dev;
+ map = &smap->map;
+
+ map->dev = smux->dev;
+ map->name = kstrdup(new_name, GFP_KERNEL);
+ if (!map->name) {
+ ret = -ENOMEM;
+ devm_kfree(smux->dev, smap);
+ goto unlock;
+ }
+ map->function = map->name;
+ list_add_tail(&smap->node, &smux_maps);
+ ret = 0;
+
+unlock:
+ mutex_unlock(&smux_mutex);
+
+ return ret;
+}
+
+/**
+ * smux_parse_one_pinctrl_entry() - parses a device tree pinctrl entry
+ * @smux: smux driver instance
+ * @np: device node for mux entry
+ */
+static int __init smux_parse_one_pinctrl_entry(struct smux_device *smux,
+ struct device_node *np)
+{
+ int count = 0;
+
+ do {
+ struct device_node *mux_np;
+ struct smux_function *function;
+ int res;
+
+ mux_np = of_parse_phandle(np, PMX_PINCTRL_NAME,
+ count);
+ if (!mux_np)
+ break;
+
+ function = smux_get_function_by_node(smux, mux_np);
+ if (!function)
+ break;
+
+ res = smux_rename_function(function, np->full_name);
+ if (res < 0) {
+ dev_err(smux->dev, "could not rename %s to %s\n",
+ function->name, np->full_name);
+ break;
+ }
+
+ res = smux_add_map(smux, np);
+ if (res < 0) {
+ dev_err(smux->dev, "could not add mapping for %s\n",
+ np->full_name);
+ break;
+ }
+ } while (++count);
+
+ return count;
+}
+
+/**
+ * smux_load_mux_register() - parses all the device tree mux entries
+ * @smux: smux driver instance
+ */
+static int __init smux_load_mux_registers(struct smux_device *smux)
+{
+ struct device_node *np;
+ int ret;
+
+ for_each_child_of_node(smux->dev->of_node, np) {
+ ret = smux_parse_one_pinmux_entry(smux, np);
+ }
+
+ for_each_node_with_property(np, PMX_PINCTRL_NAME) {
+ ret = smux_parse_one_pinctrl_entry(smux, np);
+ }
+
+ return 0;
+}
+
+/**
+ * smux_populate_map() - populates device map for pinmux_register_mappings()
+ * @smux: smux driver instance
+ *
+ * Note that we need to fill in the ctrl_dev here as it's not known earlier
+ * before pinctrl_register().
+ */
+static int __init smux_populate_map(struct smux_device *smux)
+{
+ struct smux_map *smap;
+ int i = 0, ret;
+
+ mutex_lock(&smux_mutex);
+ list_for_each_entry(smap, &smux_maps, node) {
+ if (smap->smux != smux)
+ continue;
+ smap->map.ctrl_dev = smux->pctl->dev;
+ i++;
+ }
+ if (!i) {
+ dev_err(smux->dev, "no maps found\n");
+ ret = -ENODEV;
+ goto unlock;
+ }
+
+ dev_dbg(smux->dev, "allocating %i entries for map table\n", i);
+ smux->maps.ma = devm_kzalloc(smux->dev, sizeof(*smux->maps.ma) * i,
+ GFP_KERNEL);
+ if (!smux->maps.ma) {
+ ret = -ENOMEM;
+ goto unlock;
+ }
+
+ i = 0;
+ list_for_each_entry(smap, &smux_maps, node) {
+ struct pinmux_map *map = &smux->maps.ma[i];
+
+ if (smap->smux != smux)
+ continue;
+
+ *map = smap->map;
+ i++;
+ }
+ smux->maps.max = i - 1;
+ ret = i;
+
+unlock:
+ mutex_unlock(&smux_mutex);
+
+ return ret;
+}
+
+/**
+ * smux_free_maps() - free memory used by device maps
+ * @smux: smux driver instance
+ */
+static void smux_free_maps(struct smux_device *smux)
+{
+ struct list_head *pos, *tmp;
+
+ mutex_lock(&smux_mutex);
+ list_for_each_safe(pos, tmp, &smux_maps) {
+ struct smux_map *smap;
+
+ smap = list_entry(pos, struct smux_map, node);
+ if (smap->smux != smux)
+ continue;
+
+ kfree(smap->map.name);
+ list_del(&smap->node);
+ devm_kfree(smux->dev, smap);
+ }
+ if (smux->maps.ma)
+ devm_kfree(smux->dev, smux->maps.ma);
+ mutex_unlock(&smux_mutex);
+}
+
+/**
+ * smux_free_funcs() - free memory used by functions
+ * @smux: smux driver instance
+ */
+static void smux_free_funcs(struct smux_device *smux)
+{
+ struct list_head *pos, *tmp;
+ int i;
+
+ mutex_lock(&smux_mutex);
+ for (i = 0; i < smux->nfuncs; i++) {
+ struct smux_function *func;
+
+ func = radix_tree_lookup(&smux->ftree, i);
+ if (!func)
+ continue;
+ radix_tree_delete(&smux->ftree, i);
+ }
+ list_for_each_safe(pos, tmp, &smux_functions) {
+ struct smux_function *function;
+
+ function = list_entry(pos, struct smux_function, node);
+ if (function->smux != smux)
+ continue;
+
+ kfree(function->name);
+ if (function->vals)
+ devm_kfree(smux->dev, function->vals);
+ if (function->pgnames)
+ devm_kfree(smux->dev, function->pgnames);
+ list_del(&function->node);
+ devm_kfree(smux->dev, function);
+ }
+ mutex_unlock(&smux_mutex);
+}
+
+/**
+ * smux_free_pingroups() - free memory used by pingroups
+ * @smux: smux driver instance
+ */
+static void smux_free_pingroups(struct smux_device *smux)
+{
+ struct list_head *pos, *tmp;
+ int i;
+
+ mutex_lock(&smux_mutex);
+ for (i = 0; i < smux->ngroups; i++) {
+ struct smux_pingroup *pingroup;
+
+ pingroup = radix_tree_lookup(&smux->pgtree, i);
+ if (!pingroup)
+ continue;
+ radix_tree_delete(&smux->pgtree, i);
+ }
+ list_for_each_safe(pos, tmp, &smux_pingroups) {
+ struct smux_pingroup *pingroup;
+
+ pingroup = list_entry(pos, struct smux_pingroup, node);
+ if (pingroup->smux != smux)
+ continue;
+
+ kfree(pingroup->name);
+ list_del(&pingroup->node);
+ devm_kfree(smux->dev, pingroup);
+ }
+ mutex_unlock(&smux_mutex);
+}
+
+/**
+ * smux_free_resources() - free memory used by this driver
+ * @smux: smux driver instance
+ */
+static void smux_free_resources(struct smux_device *smux)
+{
+ if (smux->pctl)
+ pinctrl_unregister(smux->pctl);
+
+ smux_free_maps(smux);
+ smux_free_funcs(smux);
+ smux_free_pingroups(smux);
+
+ if (smux->pins.pa)
+ devm_kfree(smux->dev, smux->pins.pa);
+ if (smux->names)
+ devm_kfree(smux->dev, smux->names);
+}
+
+/**
+ * smux_register() - initializes and registers with pinctrl framework
+ * @smux: smux driver instance
+ */
+static int __init smux_register(struct smux_device *smux)
+{
+ int ret;
+
+ if (!smux->dev->of_node)
+ return -ENODEV;
+
+ smux->pctlops = &smux_pinctrl_ops;
+ smux->pmxops = &smux_pinmux_ops;
+ smux->desc = &smux_pinctrl_desc;
+
+ ret = smux_allocate_pin_table(smux);
+ if (ret < 0)
+ goto free;
+
+ ret = smux_load_mux_registers(smux);
+ if (ret < 0)
+ goto free;
+
+ smux->pctl = pinctrl_register(smux->desc, smux->dev, smux);
+ if (!smux->pctl) {
+ dev_err(smux->dev, "could not register simple pinmux driver\n");
+ ret = -EINVAL;
+ goto free;
+ }
+
+ ret = smux_populate_map(smux);
+ if (ret < 0)
+ goto free;
+
+ ret = pinmux_register_mappings(smux->maps.ma,
+ smux->maps.max + 1);
+ if (ret < 0)
+ goto free;
+
+ dev_info(smux->dev, "pins: %i pingroups: %i functions: %i maps: %i\n",
+ smux->pins.max + 1, smux->ngroups,
+ smux->nfuncs, smux->maps.max + 1);
+
+ return 0;
+
+free:
+ smux_free_resources(smux);
+
+ return ret;
+}
+
+static struct of_device_id smux_of_match[];
+static int __devinit smux_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *match;
+ const u32 *val;
+ struct resource res;
+ struct smux_device *smux;
+ int len, ret;
+
+ match = of_match_device(smux_of_match, &pdev->dev);
+ if (!match)
+ return -EINVAL;
+
+ smux = devm_kzalloc(&pdev->dev, sizeof(*smux), GFP_KERNEL);
+ if (!smux) {
+ dev_err(&pdev->dev, "could not allocate\n");
+ return -ENOMEM;
+ }
+ smux->dev = &pdev->dev;
+
+ val = of_get_property(pdev->dev.of_node,
+ "pinctrl-simple,register-width", &len);
+ if (!val || len != 4) {
+ dev_err(smux->dev, "mux register width not specified\n");
+ ret = -EINVAL;
+ goto free;
+ }
+ smux->width = be32_to_cpup(val);
+
+ val = of_get_property(pdev->dev.of_node,
+ "pinctrl-simple,function-mask", &len);
+ if (!val || len != 4) {
+ dev_err(smux->dev, "function register mask not specified\n");
+ ret = -EINVAL;
+ goto free;
+ }
+ smux->fmask = be32_to_cpup(val);
+ smux->fshift = ffs(smux->fmask) - 1;
+ smux->fmax = smux->fmask >> smux->fshift;
+
+ val = of_get_property(pdev->dev.of_node,
+ "pinctrl-simple,function-off", &len);
+ if (!val || len != 4) {
+ dev_err(smux->dev, "function off mode not specified\n");
+ ret = -EINVAL;
+ goto free;
+ }
+ smux->foff = be32_to_cpup(val);
+
+ val = of_get_property(pdev->dev.of_node,
+ "pinctrl-simple,pinconf-mask", &len);
+ if (!val || len != 4) {
+ dev_err(smux->dev, "pinconf mask not specified\n");
+ ret = -EINVAL;
+ goto free;
+ }
+ smux->cmask = be32_to_cpup(val);
+
+ val = of_get_property(pdev->dev.of_node, "#pinmux-cells", &len);
+ if (!val || len != 4) {
+ dev_err(smux->dev, "#pinmux-cells not specified\n");
+ ret = -EINVAL;
+ goto free;
+ }
+ smux->cells = be32_to_cpup(val);
+
+ ret = of_address_to_resource(pdev->dev.of_node, 0, &res);
+ if (ret) {
+ dev_err(smux->dev, "could not get resource\n");
+ goto free;
+ }
+
+ smux->res = devm_request_mem_region(smux->dev, res.start,
+ resource_size(&res), DRIVER_NAME);
+ if (!smux->res) {
+ dev_err(smux->dev, "could not get mem_region\n");
+ ret = -EBUSY;
+ goto free;
+ }
+
+ smux->size = resource_size(smux->res);
+ smux->base = devm_ioremap(smux->dev, smux->res->start, smux->size);
+ if (!smux->base) {
+ dev_err(smux->dev, "could not ioremap\n");
+ ret = -ENODEV;
+ goto release;
+ }
+
+ INIT_RADIX_TREE(&smux->pgtree, GFP_KERNEL);
+ INIT_RADIX_TREE(&smux->ftree, GFP_KERNEL);
+ platform_set_drvdata(pdev, smux);
+
+ switch (smux->width) {
+ case 8:
+ smux->read = smux_readb;
+ smux->write = smux_writeb;
+ break;
+ case 16:
+ smux->read = smux_readw;
+ smux->write = smux_writew;
+ break;
+ case 32:
+ smux->read = smux_readl;
+ smux->write = smux_writel;
+ break;
+ default:
+ break;
+ }
+
+ ret = smux_register(smux);
+ if (ret < 0) {
+ dev_err(smux->dev, "could not add mux registers: %i\n", ret);
+ goto iounmap;
+ }
+
+ return 0;
+
+iounmap:
+ devm_iounmap(smux->dev, smux->base);
+release:
+ devm_release_mem_region(smux->dev,
+ smux->res->start, resource_size(smux->res));
+free:
+ devm_kfree(smux->dev, smux);
+
+ return ret;
+}
+
+static int __devexit smux_remove(struct platform_device *pdev)
+{
+ struct smux_device *smux = platform_get_drvdata(pdev);
+
+ if (!smux)
+ return 0;
+
+ smux_free_resources(smux);
+ devm_iounmap(smux->dev, smux->base);
+ devm_release_mem_region(smux->dev,
+ smux->res->start, resource_size(smux->res));
+ platform_set_drvdata(pdev, NULL);
+ devm_kfree(smux->dev, smux);
+
+ return 0;
+}
+
+static struct of_device_id smux_of_match[] __devinitdata = {
+ { .compatible = DRIVER_NAME, },
+ { .compatible = "ti,omap2420-pinmux", },
+ { .compatible = "ti,omap2430-pinmux", },
+ { .compatible = "ti,omap3-pinmux", },
+ { .compatible = "ti,omap4-pinmux", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, smux_of_match);
+
+static struct platform_driver smux_driver = {
+ .probe = smux_probe,
+ .remove = __devexit_p(smux_remove),
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = DRIVER_NAME,
+ .of_match_table = smux_of_match,
+ },
+};
+
+module_platform_driver(smux_driver);
+
+MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
+MODULE_DESCRIPTION("Simple device tree pinctrl driver");
+MODULE_LICENSE("GPL");


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  Last update: 2012-02-03 21:57    [W:0.214 / U:0.412 seconds]
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