Commit deda8287 authored by Viresh Kumar's avatar Viresh Kumar Committed by Arnd Bergmann

pinctrl: Add SPEAr pinctrl drivers

This adds pinctrl driver for SPEAr platform. It also updates MAINTAINERS file
for SPEAr pinctrl drivers.
Signed-off-by: default avatarViresh Kumar <viresh.kumar@st.com>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Reviewed-by: default avatarStephen Warren <swarren@wwwdotorg.org>
parent f3215b42
......@@ -5234,6 +5234,14 @@ M: Linus Walleij <linus.walleij@linaro.org>
S: Maintained
F: drivers/pinctrl/
PIN CONTROLLER - ST SPEAR
M: Viresh Kumar <viresh.kumar@st.com>
L: spear-devel@list.st.com
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
W: http://www.st.com/spear
S: Maintained
F: driver/pinctrl/spear/
PKTCDVD DRIVER
M: Peter Osterlund <petero2@telia.com>
S: Maintained
......@@ -6330,21 +6338,6 @@ F: arch/arm/mach-spear*/clock.c
F: arch/arm/plat-spear/clock.c
F: arch/arm/plat-spear/include/plat/clock.h
SPEAR PAD MULTIPLEXING SUPPORT
M: Viresh Kumar <viresh.kumar@st.com>
L: spear-devel@list.st.com
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
W: http://www.st.com/spear
S: Maintained
F: arch/arm/plat-spear/include/plat/padmux.h
F: arch/arm/plat-spear/padmux.c
F: arch/arm/mach-spear*/spear*xx.c
F: arch/arm/mach-spear*/include/mach/generic.h
F: arch/arm/mach-spear3xx/spear3*0.c
F: arch/arm/mach-spear3xx/spear3*0_evb.c
F: arch/arm/mach-spear6xx/spear600.c
F: arch/arm/mach-spear6xx/spear600_evb.c
SPI SUBSYSTEM
M: Grant Likely <grant.likely@secretlab.ca>
L: spi-devel-general@lists.sourceforge.net
......
......@@ -84,6 +84,8 @@ config PINCTRL_COH901
COH 901 335 and COH 901 571/3. They contain 3, 5 or 7
ports of 8 GPIO pins each.
source "drivers/pinctrl/spear/Kconfig"
endmenu
endif
......@@ -16,3 +16,5 @@ 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-$(CONFIG_PLAT_SPEAR) += spear/
#
# ST Microelectronics SPEAr PINCTRL drivers
#
if PLAT_SPEAR
config PINCTRL_SPEAR
bool
depends on OF
select PINMUX
help
This enables pin control drivers for SPEAr Platform
endif
# SPEAr pinmux support
obj-$(CONFIG_PINCTRL_SPEAR) += pinctrl-spear.o
/*
* Driver for the ST Microelectronics SPEAr pinmux
*
* Copyright (C) 2012 ST Microelectronics
* Viresh Kumar <viresh.kumar@st.com>
*
* Inspired from:
* - U300 Pinctl drivers
* - Tegra Pinctl drivers
*
* 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/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include "pinctrl-spear.h"
#define DRIVER_NAME "spear-pinmux"
static inline u32 pmx_readl(struct spear_pmx *pmx, u32 reg)
{
return readl_relaxed(pmx->vbase + reg);
}
static inline void pmx_writel(struct spear_pmx *pmx, u32 val, u32 reg)
{
writel_relaxed(val, pmx->vbase + reg);
}
static int set_mode(struct spear_pmx *pmx, int mode)
{
struct spear_pmx_mode *pmx_mode = NULL;
int i;
u32 val;
if (!pmx->machdata->pmx_modes || !pmx->machdata->npmx_modes)
return -EINVAL;
for (i = 0; i < pmx->machdata->npmx_modes; i++) {
if (pmx->machdata->pmx_modes[i]->mode == (1 << mode)) {
pmx_mode = pmx->machdata->pmx_modes[i];
break;
}
}
if (!pmx_mode)
return -EINVAL;
val = pmx_readl(pmx, pmx_mode->reg);
val &= ~pmx_mode->mask;
val |= pmx_mode->val;
pmx_writel(pmx, val, pmx_mode->reg);
pmx->machdata->mode = pmx_mode->mode;
dev_info(pmx->dev, "Configured Mode: %s with id: %x\n\n",
pmx_mode->name ? pmx_mode->name : "no_name",
pmx_mode->reg);
return 0;
}
void __devinit pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg)
{
struct spear_pingroup *pgroup;
struct spear_modemux *modemux;
int i, j, group;
for (group = 0; group < machdata->ngroups; group++) {
pgroup = machdata->groups[group];
for (i = 0; i < pgroup->nmodemuxs; i++) {
modemux = &pgroup->modemuxs[i];
for (j = 0; j < modemux->nmuxregs; j++)
if (modemux->muxregs[j].reg == 0xFFFF)
modemux->muxregs[j].reg = reg;
}
}
}
static int spear_pinctrl_get_groups_cnt(struct pinctrl_dev *pctldev)
{
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
return pmx->machdata->ngroups;
}
static const char *spear_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
unsigned group)
{
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
return pmx->machdata->groups[group]->name;
}
static int spear_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
unsigned group, const unsigned **pins, unsigned *num_pins)
{
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
*pins = pmx->machdata->groups[group]->pins;
*num_pins = pmx->machdata->groups[group]->npins;
return 0;
}
static void spear_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned offset)
{
seq_printf(s, " " DRIVER_NAME);
}
int spear_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np_config,
struct pinctrl_map **map, unsigned *num_maps)
{
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
struct device_node *np;
struct property *prop;
const char *function, *group;
int ret, index = 0, count = 0;
/* calculate number of maps required */
for_each_child_of_node(np_config, np) {
ret = of_property_read_string(np, "st,function", &function);
if (ret < 0)
return ret;
ret = of_property_count_strings(np, "st,pins");
if (ret < 0)
return ret;
count += ret;
}
if (!count) {
dev_err(pmx->dev, "No child nodes passed via DT\n");
return -ENODEV;
}
*map = kzalloc(sizeof(**map) * count, GFP_KERNEL);
if (!*map)
return -ENOMEM;
for_each_child_of_node(np_config, np) {
of_property_read_string(np, "st,function", &function);
of_property_for_each_string(np, "st,pins", prop, group) {
(*map)[index].type = PIN_MAP_TYPE_MUX_GROUP;
(*map)[index].data.mux.group = group;
(*map)[index].data.mux.function = function;
index++;
}
}
*num_maps = count;
return 0;
}
void spear_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
struct pinctrl_map *map, unsigned num_maps)
{
kfree(map);
}
static struct pinctrl_ops spear_pinctrl_ops = {
.get_groups_count = spear_pinctrl_get_groups_cnt,
.get_group_name = spear_pinctrl_get_group_name,
.get_group_pins = spear_pinctrl_get_group_pins,
.pin_dbg_show = spear_pinctrl_pin_dbg_show,
.dt_node_to_map = spear_pinctrl_dt_node_to_map,
.dt_free_map = spear_pinctrl_dt_free_map,
};
static int spear_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
{
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
return pmx->machdata->nfunctions;
}
static const char *spear_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
unsigned function)
{
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
return pmx->machdata->functions[function]->name;
}
static int spear_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
unsigned function, const char *const **groups,
unsigned * const ngroups)
{
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
*groups = pmx->machdata->functions[function]->groups;
*ngroups = pmx->machdata->functions[function]->ngroups;
return 0;
}
static int spear_pinctrl_endisable(struct pinctrl_dev *pctldev,
unsigned function, unsigned group, bool enable)
{
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
const struct spear_pingroup *pgroup;
const struct spear_modemux *modemux;
struct spear_muxreg *muxreg;
u32 val, temp;
int i, j;
bool found = false;
pgroup = pmx->machdata->groups[group];
for (i = 0; i < pgroup->nmodemuxs; i++) {
modemux = &pgroup->modemuxs[i];
/* SoC have any modes */
if (pmx->machdata->modes_supported) {
if (!(pmx->machdata->mode & modemux->modes))
continue;
}
found = true;
for (j = 0; j < modemux->nmuxregs; j++) {
muxreg = &modemux->muxregs[j];
val = pmx_readl(pmx, muxreg->reg);
val &= ~muxreg->mask;
if (enable)
temp = muxreg->val;
else
temp = ~muxreg->val;
val |= temp;
pmx_writel(pmx, val, muxreg->reg);
}
}
if (!found) {
dev_err(pmx->dev, "pinmux group: %s not supported\n",
pgroup->name);
return -ENODEV;
}
return 0;
}
static int spear_pinctrl_enable(struct pinctrl_dev *pctldev, unsigned function,
unsigned group)
{
return spear_pinctrl_endisable(pctldev, function, group, true);
}
static void spear_pinctrl_disable(struct pinctrl_dev *pctldev,
unsigned function, unsigned group)
{
spear_pinctrl_endisable(pctldev, function, group, false);
}
static struct pinmux_ops spear_pinmux_ops = {
.get_functions_count = spear_pinctrl_get_funcs_count,
.get_function_name = spear_pinctrl_get_func_name,
.get_function_groups = spear_pinctrl_get_func_groups,
.enable = spear_pinctrl_enable,
.disable = spear_pinctrl_disable,
};
static struct pinctrl_desc spear_pinctrl_desc = {
.name = DRIVER_NAME,
.pctlops = &spear_pinctrl_ops,
.pmxops = &spear_pinmux_ops,
.owner = THIS_MODULE,
};
int __devinit spear_pinctrl_probe(struct platform_device *pdev,
struct spear_pinctrl_machdata *machdata)
{
struct device_node *np = pdev->dev.of_node;
struct resource *res;
struct spear_pmx *pmx;
if (!machdata)
return -ENODEV;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
if (!pmx) {
dev_err(&pdev->dev, "Can't alloc spear_pmx\n");
return -ENOMEM;
}
pmx->vbase = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (!pmx->vbase) {
dev_err(&pdev->dev, "Couldn't ioremap at index 0\n");
return -ENODEV;
}
pmx->dev = &pdev->dev;
pmx->machdata = machdata;
/* configure mode, if supported by SoC */
if (machdata->modes_supported) {
int mode = 0;
if (of_property_read_u32(np, "st,pinmux-mode", &mode)) {
dev_err(&pdev->dev, "OF: pinmux mode not passed\n");
return -EINVAL;
}
if (set_mode(pmx, mode)) {
dev_err(&pdev->dev, "OF: Couldn't configure mode: %x\n",
mode);
return -EINVAL;
}
}
platform_set_drvdata(pdev, pmx);
spear_pinctrl_desc.pins = machdata->pins;
spear_pinctrl_desc.npins = machdata->npins;
pmx->pctl = pinctrl_register(&spear_pinctrl_desc, &pdev->dev, pmx);
if (IS_ERR(pmx->pctl)) {
dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
return PTR_ERR(pmx->pctl);
}
return 0;
}
int __devexit spear_pinctrl_remove(struct platform_device *pdev)
{
struct spear_pmx *pmx = platform_get_drvdata(pdev);
pinctrl_unregister(pmx->pctl);
return 0;
}
/*
* Driver header file for the ST Microelectronics SPEAr pinmux
*
* Copyright (C) 2012 ST Microelectronics
* Viresh Kumar <viresh.kumar@st.com>
*
* 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.
*/
#ifndef __PINMUX_SPEAR_H__
#define __PINMUX_SPEAR_H__
#include <linux/pinctrl/pinctrl.h>
#include <linux/types.h>
struct platform_device;
struct device;
/**
* struct spear_pmx_mode - SPEAr pmx mode
* @name: name of pmx mode
* @mode: mode id
* @reg: register for configuring this mode
* @mask: mask of this mode in reg
* @val: val to be configured at reg after doing (val & mask)
*/
struct spear_pmx_mode {
const char *const name;
u16 mode;
u16 reg;
u16 mask;
u32 val;
};
/**
* struct spear_muxreg - SPEAr mux reg configuration
* @reg: register offset
* @mask: mask bits
* @val: val to be written on mask bits
*/
struct spear_muxreg {
u16 reg;
u32 mask;
u32 val;
};
/**
* struct spear_modemux - SPEAr mode mux configuration
* @modes: mode ids supported by this group of muxregs
* @nmuxregs: number of muxreg configurations to be done for modes
* @muxregs: array of muxreg configurations to be done for modes
*/
struct spear_modemux {
u16 modes;
u8 nmuxregs;
struct spear_muxreg *muxregs;
};
/**
* struct spear_pingroup - SPEAr pin group configurations
* @name: name of pin group
* @pins: array containing pin numbers
* @npins: size of pins array
* @modemuxs: array of modemux configurations for this pin group
* @nmodemuxs: size of array modemuxs
*
* A representation of a group of pins in the SPEAr pin controller. Each group
* allows some parameter or parameters to be configured.
*/
struct spear_pingroup {
const char *name;
const unsigned *pins;
unsigned npins;
struct spear_modemux *modemuxs;
unsigned nmodemuxs;
};
/**
* struct spear_function - SPEAr 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 spear_function {
const char *name;
const char *const *groups;
unsigned ngroups;
};
/**
* struct spear_pinctrl_machdata - SPEAr pin controller machine driver
* configuration
* @pins: An array describing all pins the pin controller affects.
* All pins which are also GPIOs must be listed first within the *array,
* and be numbered identically to the GPIO controller's *numbering.
* @npins: The numbmer of entries in @pins.
* @functions: An array describing all mux functions the SoC supports.
* @nfunctions: The numbmer of entries in @functions.
* @groups: An array describing all pin groups the pin SoC supports.
* @ngroups: The numbmer of entries in @groups.
*
* @modes_supported: Does SoC support modes
* @mode: mode configured from probe
* @pmx_modes: array of modes supported by SoC
* @npmx_modes: number of entries in pmx_modes.
*/
struct spear_pinctrl_machdata {
const struct pinctrl_pin_desc *pins;
unsigned npins;
struct spear_function **functions;
unsigned nfunctions;
struct spear_pingroup **groups;
unsigned ngroups;
bool modes_supported;
u16 mode;
struct spear_pmx_mode **pmx_modes;
unsigned npmx_modes;
};
/**
* struct spear_pmx - SPEAr pinctrl mux
* @dev: pointer to struct dev of platform_device registered
* @pctl: pointer to struct pinctrl_dev
* @machdata: pointer to SoC or machine specific structure
* @vbase: virtual base address of pinmux controller
*/
struct spear_pmx {
struct device *dev;
struct pinctrl_dev *pctl;
struct spear_pinctrl_machdata *machdata;
void __iomem *vbase;
};
/* exported routines */
void __devinit pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg);
int __devinit spear_pinctrl_probe(struct platform_device *pdev,
struct spear_pinctrl_machdata *machdata);
int __devexit spear_pinctrl_remove(struct platform_device *pdev);
#endif /* __PINMUX_SPEAR_H__ */
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