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Subject[PATCH] pinctrl: Add generic pinctrl-simple driver that supports omap2+ padconf
Add simple pinctrl driver using device tree data.

Currently this driver only works on omap2+ series of
processors, where there is either an 8 or 16-bit padconf
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.

Signed-off-by: Tony Lindgren <tony@atomide.com>
---
Here's this one finally updated to use the common pinctrl bindings.
That sure cleaned up a bunch of the nasty things in this driver :)
Nice job Stephen!
---
diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-simple.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-simple.txt
new file mode 100644
index 0000000..7b32263
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-simple.txt
@@ -0,0 +1,125 @@
+Generic simple device tree based pinctrl driver
+
+Required properties:
+- compatible : one of:
+ - "pinctrl-simple"
+ - "ti,omap2420-padconf"
+ - "ti,omap2430-padconf"
+ - "ti,omap3-padconf"
+ - "ti,omap4-padconf"
+- reg : offset and length of the register set for the mux registers
+- #pinctrl-cells : width of the pinctrl 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
+
+This driver uses the common pinctrl bindings as specified in
+pinctrl-bindings.txt document in this directory. The common bindings are used
+to specify the client device states using pinctrl-0 and pinctrl-names entries.
+
+This driver supports parsing one or more pinctrl functions as the subnodes of
+the pinctrl driver entry. One or more registers can be specified for each
+function, see uart2 and uart3 examples below. If you are concerned about boot
+time, parsing multiple registers in a single function is slightly faster.
+
+For setting all static board specific pins, see the pinmux_board_pins example
+below. If you are concerned about the boot time, set up the static pins in
+the bootloader, and only set up selected pins as device tree entries.
+
+This driver assumes currently that there is one register for each pin. If you
+have some pins with more complicated configuration, you can set up a separate
+hardware specific driver for those pins.
+
+Example:
+
+/* SoC common file, such as omap4.dtsi */
+omap4_pmx_core: pinmux@4a100040 {
+ compatible = "ti,omap4-padconf";
+ reg = <0x4a100040 0x0196>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ #pinctrl-cells = <2>;
+ pinctrl-simple,register-width = <16>;
+ pinctrl-simple,function-mask = <0x7>;
+ pinctrl-simple,function-off = <0xffffffff>;
+ pinctrl-simple,pinconf-mask = <0xfff8>;
+};
+
+omap4_pmx_wkup: pinmux@4a31e040 {
+ compatible = "ti,omap4-padconf";
+ reg = <0x4a31e040 0x0038>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ #pinctrl-cells = <2>;
+ pinctrl-simple,register-width = <16>;
+ pinctrl-simple,function-mask = <0x7>;
+ pinctrl-simple,function-off = <0xffffffff>;
+ pinctrl-simple,pinconf-mask = <0xfff8>;
+};
+
+
+/* board specific .dts file, such as omap4-sdp.dts */
+&omap4_pmx_core {
+
+ /*
+ * map all board specific static pins enabled by the pinctrl driver
+ * itself during the boot (or just set them up in the bootloader)
+ */
+ pinctrl-names = "default";
+ pinctrl-0 = <&board_pins>;
+
+ board_pins: pinmux_board_pins {
+ board_static_pins {
+ pinctrl-simple,cells = <
+ 0x6c 0xf /* CSI21_DX3 OMAP_PIN_OUTPUT | OMAP_MUX_MODE7 */
+ 0x6e 0xf /* CSI21_DY3 OMAP_PIN_OUTPUT | OMAP_MUX_MODE7 */
+ 0x70 0xf /* CSI21_DX4 OMAP_PIN_OUTPUT | OMAP_MUX_MODE7 */
+ 0x72 0xf /* CSI21_DY4 OMAP_PIN_OUTPUT | OMAP_MUX_MODE7 */
+ >;
+ };
+ };
+
+
+ /* map all uart2 pins as a single function */
+ uart2_pins: pinmux_uart2_pins {
+ uart2_pins {
+ pinctrl-simple,cells = <
+ 0xd8 0x118 /* UART2_CTS OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0 */
+ 0xda 0 /* UART2_RTS OMAP_PIN_OUTPUT | OMAP_MUX_MODE0 */
+ 0xdc 0x118 /* UART2_RX OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0 */
+ 0xde 0 /* UART2_TX OMAP_PIN_OUTPUT | OMAP_MUX_MODE0 */
+ >;
+ };
+ };
+
+ /* map all uart3 pins as separate functions */
+ uart3_pins: pinmux_uart3_pins {
+ uart3_cts_rctx.uart3_cts_rctx {
+ pinctrl-simple,cells = <0x100 0x118>; /* OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0 */
+ };
+
+ uart3_rts_sd.uart3_rts_sd {
+ pinctrl-simple,cells = <0x102 0>; /* OMAP_PIN_OUTPUT | OMAP_MUX_MODE0 */
+ };
+
+ uart3_rx_irrx.uart3_rx_irrx {
+ pinctrl-simple,cells = <0x104 0x100>; /* OMAP_PIN_INPUT | OMAP_MUX_MODE0 */
+ };
+
+ uart3_tx_irtx.uart3_tx_irtx {
+ pinctrl-simple,cells = <0x106 0>; /* OMAP_PIN_OUTPUT | OMAP_MUX_MODE0 */
+ };
+ };
+};
+
+&uart2 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&uart2_pins>;
+};
+
+&uart3 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&uart3_pins>;
+};
+
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index f73a5ea..df01cc5 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -83,6 +83,14 @@ 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 pinctrl driver"
+ depends on OF
+ select PINMUX
+ select PINCONF
+ help
+ This selects the device tree based generic pinctrl driver.
+
endmenu

endif
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index 8e3c95a..1636faa 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -19,3 +19,4 @@ obj-$(CONFIG_PINCTRL_TEGRA20) += pinctrl-tegra20.o
obj-$(CONFIG_PINCTRL_TEGRA30) += pinctrl-tegra30.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..9d24109
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-simple.c
@@ -0,0 +1,1027 @@
+/*
+ * Generic simple device tree based pinctrl 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 "core.h"
+
+#define DRIVER_NAME "pinctrl-simple"
+#define PCS_MUX_NAME "pinctrl-simple,cells"
+#define PCS_MUX_CELLS "#pinctrl-cells"
+#define PCS_REG_NAME_LEN ((sizeof(unsigned long) * 2) + 1)
+
+/**
+ * struct pcs_pingroup - pingroups for a function
+ * @np: pingroup device node pointer
+ * @name: pingroup name
+ * @gpins: array of the pins in the group
+ * @ngpins: number of pins in the group
+ */
+struct pcs_pingroup {
+ struct device_node *np;
+ const char *name;
+ int *gpins;
+ int ngpins;
+ struct list_head node;
+};
+
+/**
+ * struct pcs_func_vals - mux function register offset and value pair
+ * @reg: register virtual address
+ * @defval: default value
+ */
+struct pcs_func_vals {
+ void __iomem *reg;
+ unsigned defval;
+};
+
+/**
+ * struct pcs_function - pinctrl function
+ * @name: pinctrl function name
+ * @vals: register and vals 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
+ */
+struct pcs_function {
+ const char *name;
+ struct pcs_func_vals *vals;
+ unsigned nvals;
+ const char **pgnames;
+ int npgnames;
+ struct list_head node;
+};
+
+/**
+ * struct pcs_data - wrapper for data needed by pinctrl framework
+ * @pa: pindesc array
+ * @cur: index to current element
+ */
+struct pcs_data {
+ struct pinctrl_pin_desc *pa;
+ int cur;
+};
+
+/**
+ * struct pcs_name - register name for a pin
+ * @name: name of the pinctrl register
+ */
+struct pcs_name {
+ char name[PCS_REG_NAME_LEN];
+};
+
+/**
+ * struct pcs_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
+ * @mutex: mutex protecting the lists
+ * @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
+ * @pgtree: pingroup index radix tree
+ * @ftree: function index radix tree
+ * @pingroups: list of pingroups
+ * @functions: list of functions
+ * @ngroups: number of pingroups
+ * @nfuncs: number of functions
+ * @desc: pin controller descriptor
+ * @read: register read function to use
+ * @write: register write function to use
+ */
+struct pcs_device {
+ struct resource *res;
+ void __iomem *base;
+ unsigned size;
+ struct device *dev;
+ struct pinctrl_dev *pctl;
+ struct mutex mutex;
+
+ unsigned width;
+ unsigned fmask;
+ unsigned fshift;
+ unsigned foff;
+ unsigned cmask;
+ unsigned fmax;
+ unsigned cells;
+
+ struct pcs_name *names;
+ struct pcs_data pins;
+ struct radix_tree_root pgtree;
+ struct radix_tree_root ftree;
+
+ struct list_head pingroups;
+ struct list_head functions;
+
+ unsigned ngroups;
+ unsigned nfuncs;
+
+ struct pinctrl_desc *desc;
+
+ unsigned (*read)(void __iomem *reg);
+ void (*write)(unsigned val, void __iomem *reg);
+};
+
+static unsigned __maybe_unused pcs_readb(void __iomem *reg)
+{
+ return readb(reg);
+}
+
+static unsigned __maybe_unused pcs_readw(void __iomem *reg)
+{
+ return readw(reg);
+}
+
+static unsigned __maybe_unused pcs_readl(void __iomem *reg)
+{
+ return readl(reg);
+}
+
+static void __maybe_unused pcs_writeb(unsigned val, void __iomem *reg)
+{
+ writeb(val, reg);
+}
+
+static void __maybe_unused pcs_writew(unsigned val, void __iomem *reg)
+{
+ writew(val, reg);
+}
+
+static void __maybe_unused pcs_writel(unsigned val, void __iomem *reg)
+{
+ writel(val, reg);
+}
+
+static int pcs_get_groups_count(struct pinctrl_dev *pctldev)
+{
+ struct pcs_device *pcs;
+
+ pcs = pinctrl_dev_get_drvdata(pctldev);
+
+ return pcs->ngroups;
+}
+
+static const char *pcs_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned gselector)
+{
+ struct pcs_device *pcs;
+ struct pcs_pingroup *group;
+
+ pcs = pinctrl_dev_get_drvdata(pctldev);
+ group = radix_tree_lookup(&pcs->pgtree, gselector);
+ if (!group) {
+ dev_err(pcs->dev, "%s could not find pingroup%i\n",
+ __func__, gselector);
+ return NULL;
+ }
+
+ return group->name;
+}
+
+static int pcs_get_group_pins(struct pinctrl_dev *pctldev,
+ unsigned gselector,
+ const unsigned **pins,
+ unsigned *npins)
+{
+ struct pcs_device *pcs;
+ struct pcs_pingroup *group;
+
+ pcs = pinctrl_dev_get_drvdata(pctldev);
+ group = radix_tree_lookup(&pcs->pgtree, gselector);
+ if (!group) {
+ dev_err(pcs->dev, "%s could not find pingroup%i\n",
+ __func__, gselector);
+ return -EINVAL;
+ }
+
+ *pins = group->gpins;
+ *npins = group->ngpins;
+
+ return 0;
+}
+
+static void pcs_pin_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s,
+ unsigned offset)
+{
+ seq_printf(s, " " DRIVER_NAME);
+}
+
+static void pcs_dt_free_map(struct pinctrl_dev *pctldev,
+ struct pinctrl_map *map, unsigned num_maps)
+{
+ struct pcs_device *pcs;
+
+ pcs = pinctrl_dev_get_drvdata(pctldev);
+ devm_kfree(pcs->dev, map);
+}
+
+static int pcs_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np_config,
+ struct pinctrl_map **map, unsigned *num_maps);
+
+static struct pinctrl_ops pcs_pinctrl_ops = {
+ .get_groups_count = pcs_get_groups_count,
+ .get_group_name = pcs_get_group_name,
+ .get_group_pins = pcs_get_group_pins,
+ .pin_dbg_show = pcs_pin_dbg_show,
+ .dt_node_to_map = pcs_dt_node_to_map,
+ .dt_free_map = pcs_dt_free_map,
+};
+
+static int pcs_get_functions_count(struct pinctrl_dev *pctldev)
+{
+ struct pcs_device *pcs;
+
+ pcs = pinctrl_dev_get_drvdata(pctldev);
+
+ return pcs->nfuncs;
+}
+
+static const char *pcs_get_function_name(struct pinctrl_dev *pctldev,
+ unsigned fselector)
+{
+ struct pcs_device *pcs;
+ struct pcs_function *func;
+
+ pcs = pinctrl_dev_get_drvdata(pctldev);
+ func = radix_tree_lookup(&pcs->ftree, fselector);
+ if (!func) {
+ dev_err(pcs->dev, "%s could not find function%i\n",
+ __func__, fselector);
+ return NULL;
+ }
+
+ return func->name;
+}
+
+static int pcs_get_function_groups(struct pinctrl_dev *pctldev,
+ unsigned fselector,
+ const char * const **groups,
+ unsigned * const ngroups)
+{
+ struct pcs_device *pcs;
+ struct pcs_function *func;
+
+ pcs = pinctrl_dev_get_drvdata(pctldev);
+ func = radix_tree_lookup(&pcs->ftree, fselector);
+ if (!func) {
+ dev_err(pcs->dev, "%s could not find function%i\n",
+ __func__, fselector);
+ return -EINVAL;
+ }
+ *groups = func->pgnames;
+ *ngroups = func->npgnames;
+
+ return 0;
+}
+
+static int pcs_enable(struct pinctrl_dev *pctldev, unsigned fselector,
+ unsigned group)
+{
+ struct pcs_device *pcs;
+ struct pcs_function *func;
+ int i;
+
+ pcs = pinctrl_dev_get_drvdata(pctldev);
+ func = radix_tree_lookup(&pcs->ftree, fselector);
+ if (!func)
+ return -EINVAL;
+
+ dev_dbg(pcs->dev, "enabling function%i %s\n",
+ fselector, func->name);
+
+ for (i = 0; i < func->nvals; i++) {
+ struct pcs_func_vals *vals;
+ unsigned val;
+
+ vals = &func->vals[i];
+ val = pcs->read(vals->reg);
+ val &= ~(pcs->cmask | pcs->fmask);
+ val |= vals->defval;
+ pcs->write(val, vals->reg);
+ }
+
+ return 0;
+}
+
+static void pcs_disable(struct pinctrl_dev *pctldev, unsigned fselector,
+ unsigned group)
+{
+ struct pcs_device *pcs;
+ struct pcs_function *func;
+ int i;
+
+ pcs = pinctrl_dev_get_drvdata(pctldev);
+ func = radix_tree_lookup(&pcs->ftree, fselector);
+ if (!func) {
+ dev_err(pcs->dev, "%s could not find function%i\n",
+ __func__, fselector);
+ return;
+ }
+
+ /*
+ * Do not touch modes if off mode is larger than supported
+ * modes. Some hardware does not have clearly defined off modes.
+ */
+ if ((pcs->foff << pcs->fshift) > pcs->fshift) {
+ dev_dbg(pcs->dev, "not updating mode for disable\n");
+ return;
+ }
+
+ dev_dbg(pcs->dev, "disabling function%i %s\n",
+ fselector, func->name);
+
+ for (i = 0; i < func->nvals; i++) {
+ struct pcs_func_vals *vals;
+ unsigned val;
+
+ vals = &func->vals[i];
+ val = pcs->read(vals->reg);
+ val &= ~(pcs->cmask | pcs->fmask);
+ val |= pcs->foff << pcs->fshift;
+ pcs->write(val, vals->reg);
+ }
+}
+
+static int pcs_request_gpio(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range, unsigned offset)
+{
+ return -ENOTSUPP;
+}
+
+static struct pinmux_ops pcs_pinmux_ops = {
+ .get_functions_count = pcs_get_functions_count,
+ .get_function_name = pcs_get_function_name,
+ .get_function_groups = pcs_get_function_groups,
+ .enable = pcs_enable,
+ .disable = pcs_disable,
+ .gpio_request_enable = pcs_request_gpio,
+};
+
+static int pcs_pinconf_get(struct pinctrl_dev *pctldev,
+ unsigned pin, unsigned long *config)
+{
+ return -ENOTSUPP;
+}
+
+static int pcs_pinconf_set(struct pinctrl_dev *pctldev,
+ unsigned pin, unsigned long config)
+{
+ return -ENOTSUPP;
+}
+
+static int pcs_pinconf_group_get(struct pinctrl_dev *pctldev,
+ unsigned group, unsigned long *config)
+{
+ return -ENOTSUPP;
+}
+
+static int pcs_pinconf_group_set(struct pinctrl_dev *pctldev,
+ unsigned group, unsigned long config)
+{
+ return -ENOTSUPP;
+}
+
+static void pcs_pinconf_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s, unsigned offset)
+{
+}
+
+static void pcs_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s, unsigned selector)
+{
+}
+
+static struct pinconf_ops pcs_pinconf_ops = {
+ .pin_config_get = pcs_pinconf_get,
+ .pin_config_set = pcs_pinconf_set,
+ .pin_config_group_get = pcs_pinconf_group_get,
+ .pin_config_group_set = pcs_pinconf_group_set,
+ .pin_config_dbg_show = pcs_pinconf_dbg_show,
+ .pin_config_group_dbg_show = pcs_pinconf_group_dbg_show,
+};
+
+/**
+ * pcs_add_pin() - add a pin to the static per controller pin array
+ * @pcs: pcs driver instance
+ * @offset: register offset from base
+ */
+static int __devinit pcs_add_pin(struct pcs_device *pcs, unsigned offset)
+{
+ struct pinctrl_pin_desc *pin;
+ struct pcs_name *pn;
+ char *name;
+ int i;
+
+ i = pcs->pins.cur;
+ if (i >= pcs->desc->npins) {
+ dev_err(pcs->dev, "too many pins, max %i\n",
+ pcs->desc->npins);
+ return -ENOMEM;
+ }
+
+ pin = &pcs->pins.pa[i];
+ pn = &pcs->names[i];
+ name = pn->name;
+ sprintf(name, "%lx",
+ (unsigned long)pcs->res->start + offset);
+ pin->name = name;
+ pin->number = i;
+ pcs->pins.cur++;
+
+ return i;
+}
+
+/**
+ * pcs_allocate_pin_table() - adds all the pins for the pinctrl driver
+ * @pcs: pcs driver instance
+ *
+ * In case of errors, resources are freed in pcs_free_resources.
+ *
+ * If your hardware needs holes in the address space, then just set
+ * up multiple driver instances.
+ *
+ * REVISIT: Handle the address space better for multiple registers
+ * per pin type hardware.
+ */
+static int __devinit pcs_allocate_pin_table(struct pcs_device *pcs)
+{
+ int mux_bytes, nr_pins, i;
+
+ mux_bytes = pcs->width / BITS_PER_BYTE;
+ nr_pins = pcs->size / mux_bytes;
+
+ dev_dbg(pcs->dev, "allocating %i pins\n", nr_pins);
+ pcs->pins.pa = devm_kzalloc(pcs->dev,
+ sizeof(*pcs->pins.pa) * nr_pins,
+ GFP_KERNEL);
+ if (!pcs->pins.pa)
+ return -ENOMEM;
+
+ pcs->names = devm_kzalloc(pcs->dev,
+ sizeof(struct pcs_name) * nr_pins,
+ GFP_KERNEL);
+ if (!pcs->names)
+ return -ENOMEM;
+
+ pcs->desc->pins = pcs->pins.pa;
+ pcs->desc->npins = nr_pins;
+
+ for (i = 0; i < pcs->desc->npins; i++) {
+ unsigned offset;
+ int res;
+
+ offset = i * mux_bytes;
+ res = pcs_add_pin(pcs, offset);
+ if (res < 0) {
+ dev_err(pcs->dev, "error adding pins: %i\n", res);
+ return res;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * pcs_add_function() - adds a new function to the function list
+ * @pcs: pcs 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 struct pcs_function *pcs_add_function(struct pcs_device *pcs,
+ struct device_node *np,
+ const char *name,
+ struct pcs_func_vals *vals,
+ unsigned nvals,
+ const char **pgnames,
+ unsigned npgnames)
+{
+ struct pcs_function *function;
+
+ function = devm_kzalloc(pcs->dev, sizeof(*function), GFP_KERNEL);
+ if (!function)
+ return NULL;
+
+ function->name = name;
+ function->vals = vals;
+ function->nvals = nvals;
+ function->pgnames = pgnames;
+ function->npgnames = npgnames;
+
+ mutex_lock(&pcs->mutex);
+ list_add_tail(&function->node, &pcs->functions);
+ radix_tree_insert(&pcs->ftree, pcs->nfuncs, function);
+ pcs->nfuncs++;
+ mutex_unlock(&pcs->mutex);
+
+ return function;
+}
+
+static void pcs_remove_function(struct pcs_device *pcs,
+ struct pcs_function *function)
+{
+ int i;
+
+ mutex_lock(&pcs->mutex);
+ for (i = 0; i < pcs->nfuncs; i++) {
+ struct pcs_function *found;
+
+ found = radix_tree_lookup(&pcs->ftree, i);
+ if (found == function)
+ radix_tree_delete(&pcs->ftree, i);
+ }
+ list_del(&function->node);
+ mutex_unlock(&pcs->mutex);
+}
+
+/**
+ * pcs_add_pingroup() - add a pingroup to the pingroup list
+ * @pcs: pcs 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 pcs_add_pingroup(struct pcs_device *pcs,
+ struct device_node *np,
+ const char *name,
+ int *gpins,
+ int ngpins)
+{
+ struct pcs_pingroup *pingroup;
+
+ pingroup = devm_kzalloc(pcs->dev, sizeof(*pingroup), GFP_KERNEL);
+ if (!pingroup)
+ return -ENOMEM;
+
+ pingroup->name = name;
+ pingroup->np = np;
+ pingroup->gpins = gpins;
+ pingroup->ngpins = ngpins;
+
+ mutex_lock(&pcs->mutex);
+ list_add_tail(&pingroup->node, &pcs->pingroups);
+ radix_tree_insert(&pcs->pgtree, pcs->ngroups, pingroup);
+ pcs->ngroups++;
+ mutex_unlock(&pcs->mutex);
+
+ return 0;
+}
+
+/**
+ * pcs_get_pin_by_offset() - get a pin index based on the register offset
+ * @pcs: pcs driver instance
+ * @offset: register offset from the base
+ *
+ * Note that this is OK as long as the pins are in a static array.
+ */
+static int pcs_get_pin_by_offset(struct pcs_device *pcs, unsigned offset)
+{
+ unsigned index;
+
+ if (offset >= pcs->size) {
+ dev_err(pcs->dev, "mux offset out of range: 0x%x (0x%x)\n",
+ offset, pcs->size);
+ return -EINVAL;
+ }
+
+ index = offset / (pcs->width / BITS_PER_BYTE);
+
+ return index;
+}
+
+/**
+ * smux_parse_one_pinctrl_entry() - parses a device tree mux entry
+ * @pcs: pinctrl driver instance
+ * @np: device node of the mux entry
+ * @map: map entry
+ * @pgnames: pingroup names
+ *
+ * Note that this currently supports only #pinctrl-cells = 2.
+ * This could be improved to parse controllers that have additional
+ * auxilary registers per mux.
+ */
+static int __init pcs_parse_one_pinctrl_entry(struct pcs_device *pcs,
+ struct device_node *np,
+ struct pinctrl_map **map,
+ const char **pgnames)
+{
+ struct pcs_func_vals *vals;
+ const __be32 *mux;
+ int size, rows, *pins, index = 0, found = 0, res = -ENOMEM;
+ struct pcs_function *function;
+
+ if (pcs->cells != 2) {
+ dev_err(pcs->dev, "unhandled %s: %i\n", PCS_MUX_CELLS,
+ pcs->cells);
+ return -EINVAL;
+ }
+
+ mux = of_get_property(np, PCS_MUX_NAME, &size);
+ if ((!mux) || (size < sizeof(*mux) * pcs->cells)) {
+ dev_err(pcs->dev, "bad data for mux %s\n",
+ np->name);
+ return -EINVAL;
+ }
+
+ size /= sizeof(*mux); /* Number of elements in array */
+ rows = size / pcs->cells;
+
+ vals = devm_kzalloc(pcs->dev, sizeof(*vals) * rows, GFP_KERNEL);
+ if (!vals)
+ return -ENOMEM;
+
+ pins = devm_kzalloc(pcs->dev, sizeof(*pins) * rows, GFP_KERNEL);
+ if (!pins)
+ goto free_vals;
+
+ while (index < size) {
+ unsigned offset, defval;
+ int pin;
+
+ offset = be32_to_cpup(mux + index++);
+ defval = be32_to_cpup(mux + index++);
+ vals[found].reg = pcs->base + offset;
+ vals[found].defval = defval;
+
+ pin = pcs_get_pin_by_offset(pcs, offset);
+ if (pin < 0) {
+ dev_err(pcs->dev,
+ "could not add functions for %s %ux\n",
+ np->name, offset);
+ break;
+ }
+ pins[found++] = pin;
+ }
+
+ pgnames[0] = np->name;
+ function = pcs_add_function(pcs, np, np->name, vals, found, pgnames, 1);
+ if (!function)
+ goto free_pins;
+
+ res = pcs_add_pingroup(pcs, np, np->name, pins, found);
+ if (res < 0)
+ goto free_function;
+
+ (*map)->type = PIN_MAP_TYPE_MUX_GROUP;
+ (*map)->data.mux.group = np->name;
+ (*map)->data.mux.function = np->name;
+
+ return 0;
+
+free_function:
+ pcs_remove_function(pcs, function);
+
+free_pins:
+ devm_kfree(pcs->dev, pins);
+
+free_vals:
+ devm_kfree(pcs->dev, vals);
+
+ return res;
+}
+/**
+ * pcs_dt_node_to_map() - allocates and parses pinctrl maps
+ * @pctldev: pinctrl instance
+ * @np_config: device tree pinmux entry
+ * @map: array of map entries
+ * @num_maps: number of maps
+ */
+static int pcs_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np_config,
+ struct pinctrl_map **map, unsigned *num_maps)
+{
+ struct pcs_device *pcs;
+ struct device_node *np;
+ struct pinctrl_map *cur_map;
+ const char **pgnames, **cur_name;
+ int ret, found_maps = 0, added_maps = 0;
+
+ pcs = pinctrl_dev_get_drvdata(pctldev);
+
+ for_each_child_of_node(np_config, np)
+ found_maps++;
+
+ *map = devm_kzalloc(pcs->dev, sizeof(**map) * found_maps,
+ GFP_KERNEL);
+ if (!map)
+ return -ENOMEM;
+
+ cur_map = *map;
+ *num_maps = 0;
+
+ pgnames = devm_kzalloc(pcs->dev, sizeof(*pgnames) * found_maps,
+ GFP_KERNEL);
+ if (!pgnames) {
+ devm_kfree(pcs->dev, *map);
+ return -ENOMEM;
+ }
+
+ cur_name = pgnames;
+
+ for_each_child_of_node(np_config, np) {
+ ret = pcs_parse_one_pinctrl_entry(pcs, np, &cur_map, cur_name);
+ if (ret < 0) {
+ dev_err(pcs->dev, "added only %i/%i entries for %s\n",
+ added_maps, found_maps, np_config->name);
+ break;
+ }
+ cur_map++;
+ cur_name++;
+ added_maps++;
+ }
+
+ *num_maps = added_maps;
+
+ return 0;
+}
+
+/**
+ * pcs_free_funcs() - free memory used by functions
+ * @pcs: pcs driver instance
+ */
+static void pcs_free_funcs(struct pcs_device *pcs)
+{
+ struct list_head *pos, *tmp;
+ int i;
+
+ mutex_lock(&pcs->mutex);
+ for (i = 0; i < pcs->nfuncs; i++) {
+ struct pcs_function *func;
+
+ func = radix_tree_lookup(&pcs->ftree, i);
+ if (!func)
+ continue;
+ radix_tree_delete(&pcs->ftree, i);
+ }
+ list_for_each_safe(pos, tmp, &pcs->functions) {
+ struct pcs_function *function;
+
+ function = list_entry(pos, struct pcs_function, node);
+ list_del(&function->node);
+ }
+ mutex_unlock(&pcs->mutex);
+}
+
+/**
+ * pcs_free_pingroups() - free memory used by pingroups
+ * @pcs: pcs driver instance
+ */
+static void pcs_free_pingroups(struct pcs_device *pcs)
+{
+ struct list_head *pos, *tmp;
+ int i;
+
+ mutex_lock(&pcs->mutex);
+ for (i = 0; i < pcs->ngroups; i++) {
+ struct pcs_pingroup *pingroup;
+
+ pingroup = radix_tree_lookup(&pcs->pgtree, i);
+ if (!pingroup)
+ continue;
+ radix_tree_delete(&pcs->pgtree, i);
+ }
+ list_for_each_safe(pos, tmp, &pcs->pingroups) {
+ struct pcs_pingroup *pingroup;
+
+ pingroup = list_entry(pos, struct pcs_pingroup, node);
+ list_del(&pingroup->node);
+ }
+ mutex_unlock(&pcs->mutex);
+}
+
+/**
+ * pcs_free_resources() - free memory used by this driver
+ * @pcs: pcs driver instance
+ */
+static void pcs_free_resources(struct pcs_device *pcs)
+{
+ if (pcs->pctl)
+ pinctrl_unregister(pcs->pctl);
+
+ pcs_free_funcs(pcs);
+ pcs_free_pingroups(pcs);
+}
+
+/**
+ * pcs_register() - initializes and registers with pinctrl framework
+ * @pcs: pcs driver instance
+ */
+static int __devinit pcs_register(struct pcs_device *pcs)
+{
+ int ret;
+
+ if (!pcs->dev->of_node)
+ return -ENODEV;
+
+ pcs->desc = devm_kzalloc(pcs->dev, sizeof(*pcs->desc), GFP_KERNEL);
+ if (!pcs->desc)
+ return -ENOMEM;
+ pcs->desc->name = DRIVER_NAME;
+ pcs->desc->pctlops = &pcs_pinctrl_ops;
+ pcs->desc->pmxops = &pcs_pinmux_ops;
+ pcs->desc->confops = &pcs_pinconf_ops;
+ pcs->desc->owner = THIS_MODULE;
+
+ ret = pcs_allocate_pin_table(pcs);
+ if (ret < 0)
+ goto free;
+
+ pcs->pctl = pinctrl_register(pcs->desc, pcs->dev, pcs);
+ if (!pcs->pctl) {
+ dev_err(pcs->dev, "could not register simple pinctrl driver\n");
+ ret = -EINVAL;
+ goto free;
+ }
+
+ dev_info(pcs->dev, "%i pins at pa %p size %u\n",
+ pcs->desc->npins, pcs->base, pcs->size);
+
+ return 0;
+
+free:
+ pcs_free_resources(pcs);
+
+ return ret;
+}
+
+#define PCS_GET_PROP_U32(name, reg, err) \
+ do { \
+ ret = of_property_read_u32(np, name, reg); \
+ if (ret) { \
+ dev_err(pcs->dev, err); \
+ goto out; \
+ } \
+ } while (0);
+
+static struct of_device_id pcs_of_match[];
+
+/*
+ * REVISIT: Handle hardware with multiple registers per pin
+ * better by adding other masks.
+ */
+static int __devinit pcs_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ const struct of_device_id *match;
+ struct resource res;
+ struct pcs_device *pcs;
+ int ret;
+
+ match = of_match_device(pcs_of_match, &pdev->dev);
+ if (!match)
+ return -EINVAL;
+
+ pcs = devm_kzalloc(&pdev->dev, sizeof(*pcs), GFP_KERNEL);
+ if (!pcs) {
+ dev_err(&pdev->dev, "could not allocate\n");
+ return -ENOMEM;
+ }
+ pcs->dev = &pdev->dev;
+ mutex_init(&pcs->mutex);
+ INIT_LIST_HEAD(&pcs->pingroups);
+ INIT_LIST_HEAD(&pcs->functions);
+
+ PCS_GET_PROP_U32("pinctrl-simple,register-width", &pcs->width,
+ "register width not specified\n");
+
+ PCS_GET_PROP_U32("pinctrl-simple,function-mask", &pcs->fmask,
+ "function register mask not specified\n");
+ pcs->fshift = ffs(pcs->fmask) - 1;
+ pcs->fmax = pcs->fmask >> pcs->fshift;
+
+ PCS_GET_PROP_U32("pinctrl-simple,function-off", &pcs->foff,
+ "function off mode not specified\n");
+
+ PCS_GET_PROP_U32("pinctrl-simple,pinconf-mask", &pcs->cmask,
+ "pinconf mask not specified\n");
+
+ PCS_GET_PROP_U32("#pinctrl-cells", &pcs->cells,
+ "#pinctrl-cells not specified\n");
+
+ ret = of_address_to_resource(pdev->dev.of_node, 0, &res);
+ if (ret) {
+ dev_err(pcs->dev, "could not get resource\n");
+ goto out;
+ }
+
+ pcs->res = devm_request_mem_region(pcs->dev, res.start,
+ resource_size(&res), DRIVER_NAME);
+ if (!pcs->res) {
+ dev_err(pcs->dev, "could not get mem_region\n");
+ ret = -EBUSY;
+ goto out;
+ }
+
+ pcs->size = resource_size(pcs->res);
+ pcs->base = devm_ioremap(pcs->dev, pcs->res->start, pcs->size);
+ if (!pcs->base) {
+ dev_err(pcs->dev, "could not ioremap\n");
+ ret = -ENODEV;
+ goto out;
+ }
+
+ INIT_RADIX_TREE(&pcs->pgtree, GFP_KERNEL);
+ INIT_RADIX_TREE(&pcs->ftree, GFP_KERNEL);
+ platform_set_drvdata(pdev, pcs);
+
+ switch (pcs->width) {
+ case 8:
+ pcs->read = pcs_readb;
+ pcs->write = pcs_writeb;
+ break;
+ case 16:
+ pcs->read = pcs_readw;
+ pcs->write = pcs_writew;
+ break;
+ case 32:
+ pcs->read = pcs_readl;
+ pcs->write = pcs_writel;
+ break;
+ default:
+ break;
+ }
+
+ ret = pcs_register(pcs);
+ if (ret < 0) {
+ dev_err(pcs->dev, "could not add mux registers: %i\n", ret);
+ goto out;
+ }
+
+ return 0;
+
+out:
+ return ret;
+}
+
+static int __devexit pcs_remove(struct platform_device *pdev)
+{
+ struct pcs_device *pcs = platform_get_drvdata(pdev);
+
+ if (!pcs)
+ return 0;
+
+ pcs_free_resources(pcs);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static struct of_device_id pcs_of_match[] __devinitdata = {
+ { .compatible = DRIVER_NAME, },
+ { .compatible = "ti,omap2420-padconf", },
+ { .compatible = "ti,omap2430-padconf", },
+ { .compatible = "ti,omap3-padconf", },
+ { .compatible = "ti,omap4-padconf", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, pcs_of_match);
+
+static struct platform_driver pcs_driver = {
+ .probe = pcs_probe,
+ .remove = __devexit_p(pcs_remove),
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = DRIVER_NAME,
+ .of_match_table = pcs_of_match,
+ },
+};
+
+module_platform_driver(pcs_driver);
+
+MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
+MODULE_DESCRIPTION("Simple device tree pinctrl driver");
+MODULE_LICENSE("GPL");

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  Last update: 2012-05-02 20:01    [W:0.159 / U:9.576 seconds]
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