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linux/drivers/pinctrl/pinctrl-falcon.c
Laurent Pinchart 022ab148d2 pinctrl: Declare operation structures as const 
The pinconf, pinctrl and pinmux operation structures hold function
pointers that are never modified. Declare them as const.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2013-03-07 05:27:29 +01:00

502 lines
14 KiB
C
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/*
* linux/drivers/pinctrl/pinmux-falcon.c
* based on linux/drivers/pinctrl/pinmux-pxa910.c
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* Copyright (C) 2012 Thomas Langer <thomas.langer@lantiq.com>
* Copyright (C) 2012 John Crispin <blogic@openwrt.org>
*/
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include "pinctrl-lantiq.h"
#include <lantiq_soc.h>
/* Multiplexer Control Register */
#define LTQ_PADC_MUX(x) (x * 0x4)
/* Pull Up Enable Register */
#define LTQ_PADC_PUEN 0x80
/* Pull Down Enable Register */
#define LTQ_PADC_PDEN 0x84
/* Slew Rate Control Register */
#define LTQ_PADC_SRC 0x88
/* Drive Current Control Register */
#define LTQ_PADC_DCC 0x8C
/* Pad Control Availability Register */
#define LTQ_PADC_AVAIL 0xF0
#define pad_r32(p, reg) ltq_r32(p + reg)
#define pad_w32(p, val, reg) ltq_w32(val, p + reg)
#define pad_w32_mask(c, clear, set, reg) \
pad_w32(c, (pad_r32(c, reg) & ~(clear)) | (set), reg)
#define pad_getbit(m, r, p) (!!(ltq_r32(m + r) & (1 << p)))
#define PORTS 5
#define PINS 32
#define PORT(x) (x / PINS)
#define PORT_PIN(x) (x % PINS)
#define MFP_FALCON(a, f0, f1, f2, f3) \
{ \
.name = #a, \
.pin = a, \
.func = { \
FALCON_MUX_##f0, \
FALCON_MUX_##f1, \
FALCON_MUX_##f2, \
FALCON_MUX_##f3, \
}, \
}
#define GRP_MUX(a, m, p) \
{ \
.name = a, \
.mux = FALCON_MUX_##m, \
.pins = p, \
.npins = ARRAY_SIZE(p), \
}
enum falcon_mux {
FALCON_MUX_GPIO = 0,
FALCON_MUX_RST,
FALCON_MUX_NTR,
FALCON_MUX_MDIO,
FALCON_MUX_LED,
FALCON_MUX_SPI,
FALCON_MUX_ASC,
FALCON_MUX_I2C,
FALCON_MUX_HOSTIF,
FALCON_MUX_SLIC,
FALCON_MUX_JTAG,
FALCON_MUX_PCM,
FALCON_MUX_MII,
FALCON_MUX_PHY,
FALCON_MUX_NONE = 0xffff,
};
static struct pinctrl_pin_desc falcon_pads[PORTS * PINS];
static int pad_count[PORTS];
static void lantiq_load_pin_desc(struct pinctrl_pin_desc *d, int bank, int len)
{
int base = bank * PINS;
int i;
for (i = 0; i < len; i++) {
/* strlen("ioXYZ") + 1 = 6 */
char *name = kzalloc(6, GFP_KERNEL);
snprintf(name, 6, "io%d", base + i);
d[i].number = base + i;
d[i].name = name;
}
pad_count[bank] = len;
}
static struct ltq_mfp_pin falcon_mfp[] = {
/* pin f0 f1 f2 f3 */
MFP_FALCON(GPIO0, RST, GPIO, NONE, NONE),
MFP_FALCON(GPIO1, GPIO, GPIO, NONE, NONE),
MFP_FALCON(GPIO2, GPIO, GPIO, NONE, NONE),
MFP_FALCON(GPIO3, GPIO, GPIO, NONE, NONE),
MFP_FALCON(GPIO4, NTR, GPIO, NONE, NONE),
MFP_FALCON(GPIO5, NTR, GPIO, NONE, NONE),
MFP_FALCON(GPIO6, RST, GPIO, NONE, NONE),
MFP_FALCON(GPIO7, MDIO, GPIO, NONE, NONE),
MFP_FALCON(GPIO8, MDIO, GPIO, NONE, NONE),
MFP_FALCON(GPIO9, LED, GPIO, NONE, NONE),
MFP_FALCON(GPIO10, LED, GPIO, NONE, NONE),
MFP_FALCON(GPIO11, LED, GPIO, NONE, NONE),
MFP_FALCON(GPIO12, LED, GPIO, NONE, NONE),
MFP_FALCON(GPIO13, LED, GPIO, NONE, NONE),
MFP_FALCON(GPIO14, LED, GPIO, NONE, NONE),
MFP_FALCON(GPIO32, ASC, GPIO, NONE, NONE),
MFP_FALCON(GPIO33, ASC, GPIO, NONE, NONE),
MFP_FALCON(GPIO34, SPI, GPIO, NONE, NONE),
MFP_FALCON(GPIO35, SPI, GPIO, NONE, NONE),
MFP_FALCON(GPIO36, SPI, GPIO, NONE, NONE),
MFP_FALCON(GPIO37, SPI, GPIO, NONE, NONE),
MFP_FALCON(GPIO38, SPI, GPIO, NONE, NONE),
MFP_FALCON(GPIO39, I2C, GPIO, NONE, NONE),
MFP_FALCON(GPIO40, I2C, GPIO, NONE, NONE),
MFP_FALCON(GPIO41, HOSTIF, GPIO, HOSTIF, JTAG),
MFP_FALCON(GPIO42, HOSTIF, GPIO, HOSTIF, NONE),
MFP_FALCON(GPIO43, SLIC, GPIO, NONE, NONE),
MFP_FALCON(GPIO44, SLIC, GPIO, PCM, ASC),
MFP_FALCON(GPIO45, SLIC, GPIO, PCM, ASC),
MFP_FALCON(GPIO64, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO65, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO66, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO67, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO68, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO69, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO70, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO71, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO72, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO73, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO74, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO75, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO76, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO77, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO78, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO79, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO80, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO81, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO82, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO83, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO84, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO85, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO86, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO87, MII, GPIO, NONE, NONE),
MFP_FALCON(GPIO88, PHY, GPIO, NONE, NONE),
};
static const unsigned pins_por[] = {GPIO0};
static const unsigned pins_ntr[] = {GPIO4};
static const unsigned pins_ntr8k[] = {GPIO5};
static const unsigned pins_hrst[] = {GPIO6};
static const unsigned pins_mdio[] = {GPIO7, GPIO8};
static const unsigned pins_bled[] = {GPIO9, GPIO10, GPIO11,
GPIO12, GPIO13, GPIO14};
static const unsigned pins_asc0[] = {GPIO32, GPIO33};
static const unsigned pins_spi[] = {GPIO34, GPIO35, GPIO36};
static const unsigned pins_spi_cs0[] = {GPIO37};
static const unsigned pins_spi_cs1[] = {GPIO38};
static const unsigned pins_i2c[] = {GPIO39, GPIO40};
static const unsigned pins_jtag[] = {GPIO41};
static const unsigned pins_slic[] = {GPIO43, GPIO44, GPIO45};
static const unsigned pins_pcm[] = {GPIO44, GPIO45};
static const unsigned pins_asc1[] = {GPIO44, GPIO45};
static struct ltq_pin_group falcon_grps[] = {
GRP_MUX("por", RST, pins_por),
GRP_MUX("ntr", NTR, pins_ntr),
GRP_MUX("ntr8k", NTR, pins_ntr8k),
GRP_MUX("hrst", RST, pins_hrst),
GRP_MUX("mdio", MDIO, pins_mdio),
GRP_MUX("bootled", LED, pins_bled),
GRP_MUX("asc0", ASC, pins_asc0),
GRP_MUX("spi", SPI, pins_spi),
GRP_MUX("spi cs0", SPI, pins_spi_cs0),
GRP_MUX("spi cs1", SPI, pins_spi_cs1),
GRP_MUX("i2c", I2C, pins_i2c),
GRP_MUX("jtag", JTAG, pins_jtag),
GRP_MUX("slic", SLIC, pins_slic),
GRP_MUX("pcm", PCM, pins_pcm),
GRP_MUX("asc1", ASC, pins_asc1),
};
static const char * const ltq_rst_grps[] = {"por", "hrst"};
static const char * const ltq_ntr_grps[] = {"ntr", "ntr8k"};
static const char * const ltq_mdio_grps[] = {"mdio"};
static const char * const ltq_bled_grps[] = {"bootled"};
static const char * const ltq_asc_grps[] = {"asc0", "asc1"};
static const char * const ltq_spi_grps[] = {"spi", "spi cs0", "spi cs1"};
static const char * const ltq_i2c_grps[] = {"i2c"};
static const char * const ltq_jtag_grps[] = {"jtag"};
static const char * const ltq_slic_grps[] = {"slic"};
static const char * const ltq_pcm_grps[] = {"pcm"};
static struct ltq_pmx_func falcon_funcs[] = {
{"rst", ARRAY_AND_SIZE(ltq_rst_grps)},
{"ntr", ARRAY_AND_SIZE(ltq_ntr_grps)},
{"mdio", ARRAY_AND_SIZE(ltq_mdio_grps)},
{"led", ARRAY_AND_SIZE(ltq_bled_grps)},
{"asc", ARRAY_AND_SIZE(ltq_asc_grps)},
{"spi", ARRAY_AND_SIZE(ltq_spi_grps)},
{"i2c", ARRAY_AND_SIZE(ltq_i2c_grps)},
{"jtag", ARRAY_AND_SIZE(ltq_jtag_grps)},
{"slic", ARRAY_AND_SIZE(ltq_slic_grps)},
{"pcm", ARRAY_AND_SIZE(ltq_pcm_grps)},
};
/* --------- pinconf related code --------- */
static int falcon_pinconf_group_get(struct pinctrl_dev *pctrldev,
unsigned group, unsigned long *config)
{
return -ENOTSUPP;
}
static int falcon_pinconf_group_set(struct pinctrl_dev *pctrldev,
unsigned group, unsigned long config)
{
return -ENOTSUPP;
}
static int falcon_pinconf_get(struct pinctrl_dev *pctrldev,
unsigned pin, unsigned long *config)
{
struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
enum ltq_pinconf_param param = LTQ_PINCONF_UNPACK_PARAM(*config);
void __iomem *mem = info->membase[PORT(pin)];
switch (param) {
case LTQ_PINCONF_PARAM_DRIVE_CURRENT:
*config = LTQ_PINCONF_PACK(param,
!!pad_getbit(mem, LTQ_PADC_DCC, PORT_PIN(pin)));
break;
case LTQ_PINCONF_PARAM_SLEW_RATE:
*config = LTQ_PINCONF_PACK(param,
!!pad_getbit(mem, LTQ_PADC_SRC, PORT_PIN(pin)));
break;
case LTQ_PINCONF_PARAM_PULL:
if (pad_getbit(mem, LTQ_PADC_PDEN, PORT_PIN(pin)))
*config = LTQ_PINCONF_PACK(param, 1);
else if (pad_getbit(mem, LTQ_PADC_PUEN, PORT_PIN(pin)))
*config = LTQ_PINCONF_PACK(param, 2);
else
*config = LTQ_PINCONF_PACK(param, 0);
break;
default:
return -ENOTSUPP;
}
return 0;
}
static int falcon_pinconf_set(struct pinctrl_dev *pctrldev,
unsigned pin, unsigned long config)
{
enum ltq_pinconf_param param = LTQ_PINCONF_UNPACK_PARAM(config);
int arg = LTQ_PINCONF_UNPACK_ARG(config);
struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
void __iomem *mem = info->membase[PORT(pin)];
u32 reg;
switch (param) {
case LTQ_PINCONF_PARAM_DRIVE_CURRENT:
reg = LTQ_PADC_DCC;
break;
case LTQ_PINCONF_PARAM_SLEW_RATE:
reg = LTQ_PADC_SRC;
break;
case LTQ_PINCONF_PARAM_PULL:
if (arg == 1)
reg = LTQ_PADC_PDEN;
else
reg = LTQ_PADC_PUEN;
break;
default:
pr_err("%s: Invalid config param %04x\n",
pinctrl_dev_get_name(pctrldev), param);
return -ENOTSUPP;
}
pad_w32(mem, BIT(PORT_PIN(pin)), reg);
if (!(pad_r32(mem, reg) & BIT(PORT_PIN(pin))))
return -ENOTSUPP;
return 0;
}
static void falcon_pinconf_dbg_show(struct pinctrl_dev *pctrldev,
struct seq_file *s, unsigned offset)
{
unsigned long config;
struct pin_desc *desc;
struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
int port = PORT(offset);
seq_printf(s, " (port %d) mux %d -- ", port,
pad_r32(info->membase[port], LTQ_PADC_MUX(PORT_PIN(offset))));
config = LTQ_PINCONF_PACK(LTQ_PINCONF_PARAM_PULL, 0);
if (!falcon_pinconf_get(pctrldev, offset, &config))
seq_printf(s, "pull %d ",
(int)LTQ_PINCONF_UNPACK_ARG(config));
config = LTQ_PINCONF_PACK(LTQ_PINCONF_PARAM_DRIVE_CURRENT, 0);
if (!falcon_pinconf_get(pctrldev, offset, &config))
seq_printf(s, "drive-current %d ",
(int)LTQ_PINCONF_UNPACK_ARG(config));
config = LTQ_PINCONF_PACK(LTQ_PINCONF_PARAM_SLEW_RATE, 0);
if (!falcon_pinconf_get(pctrldev, offset, &config))
seq_printf(s, "slew-rate %d ",
(int)LTQ_PINCONF_UNPACK_ARG(config));
desc = pin_desc_get(pctrldev, offset);
if (desc) {
if (desc->gpio_owner)
seq_printf(s, " owner: %s", desc->gpio_owner);
} else {
seq_printf(s, " not registered");
}
}
static void falcon_pinconf_group_dbg_show(struct pinctrl_dev *pctrldev,
struct seq_file *s, unsigned selector)
{
}
static const struct pinconf_ops falcon_pinconf_ops = {
.pin_config_get = falcon_pinconf_get,
.pin_config_set = falcon_pinconf_set,
.pin_config_group_get = falcon_pinconf_group_get,
.pin_config_group_set = falcon_pinconf_group_set,
.pin_config_dbg_show = falcon_pinconf_dbg_show,
.pin_config_group_dbg_show = falcon_pinconf_group_dbg_show,
};
static struct pinctrl_desc falcon_pctrl_desc = {
.owner = THIS_MODULE,
.pins = falcon_pads,
.confops = &falcon_pinconf_ops,
};
static inline int falcon_mux_apply(struct pinctrl_dev *pctrldev,
int mfp, int mux)
{
struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
int port = PORT(info->mfp[mfp].pin);
if ((port >= PORTS) || (!info->membase[port]))
return -ENODEV;
pad_w32(info->membase[port], mux,
LTQ_PADC_MUX(PORT_PIN(info->mfp[mfp].pin)));
return 0;
}
static const struct ltq_cfg_param falcon_cfg_params[] = {
{"lantiq,pull", LTQ_PINCONF_PARAM_PULL},
{"lantiq,drive-current", LTQ_PINCONF_PARAM_DRIVE_CURRENT},
{"lantiq,slew-rate", LTQ_PINCONF_PARAM_SLEW_RATE},
};
static struct ltq_pinmux_info falcon_info = {
.desc = &falcon_pctrl_desc,
.apply_mux = falcon_mux_apply,
.params = falcon_cfg_params,
.num_params = ARRAY_SIZE(falcon_cfg_params),
};
/* --------- register the pinctrl layer --------- */
int pinctrl_falcon_get_range_size(int id)
{
u32 avail;
if ((id >= PORTS) || (!falcon_info.membase[id]))
return -EINVAL;
avail = pad_r32(falcon_info.membase[id], LTQ_PADC_AVAIL);
return fls(avail);
}
void pinctrl_falcon_add_gpio_range(struct pinctrl_gpio_range *range)
{
pinctrl_add_gpio_range(falcon_info.pctrl, range);
}
static int pinctrl_falcon_probe(struct platform_device *pdev)
{
struct device_node *np;
int pad_count = 0;
int ret = 0;
/* load and remap the pad resources of the different banks */
for_each_compatible_node(np, NULL, "lantiq,pad-falcon") {
struct platform_device *ppdev = of_find_device_by_node(np);
const __be32 *bank = of_get_property(np, "lantiq,bank", NULL);
struct resource res;
u32 avail;
int pins;
if (!of_device_is_available(np))
continue;
if (!ppdev) {
dev_err(&pdev->dev, "failed to find pad pdev\n");
continue;
}
if (!bank || *bank >= PORTS)
continue;
if (of_address_to_resource(np, 0, &res))
continue;
falcon_info.clk[*bank] = clk_get(&ppdev->dev, NULL);
if (IS_ERR(falcon_info.clk[*bank])) {
dev_err(&ppdev->dev, "failed to get clock\n");
return PTR_ERR(falcon_info.clk[*bank]);
}
falcon_info.membase[*bank] = devm_ioremap_resource(&pdev->dev,
&res);
if (IS_ERR(falcon_info.membase[*bank]))
return PTR_ERR(falcon_info.membase[*bank]);
avail = pad_r32(falcon_info.membase[*bank],
LTQ_PADC_AVAIL);
pins = fls(avail);
lantiq_load_pin_desc(&falcon_pads[pad_count], *bank, pins);
pad_count += pins;
clk_enable(falcon_info.clk[*bank]);
dev_dbg(&pdev->dev, "found %s with %d pads\n",
res.name, pins);
}
dev_dbg(&pdev->dev, "found a total of %d pads\n", pad_count);
falcon_pctrl_desc.name = dev_name(&pdev->dev);
falcon_pctrl_desc.npins = pad_count;
falcon_info.mfp = falcon_mfp;
falcon_info.num_mfp = ARRAY_SIZE(falcon_mfp);
falcon_info.grps = falcon_grps;
falcon_info.num_grps = ARRAY_SIZE(falcon_grps);
falcon_info.funcs = falcon_funcs;
falcon_info.num_funcs = ARRAY_SIZE(falcon_funcs);
ret = ltq_pinctrl_register(pdev, &falcon_info);
if (!ret)
dev_info(&pdev->dev, "Init done\n");
return ret;
}
static const struct of_device_id falcon_match[] = {
{ .compatible = "lantiq,pinctrl-falcon" },
{},
};
MODULE_DEVICE_TABLE(of, falcon_match);
static struct platform_driver pinctrl_falcon_driver = {
.probe = pinctrl_falcon_probe,
.driver = {
.name = "pinctrl-falcon",
.owner = THIS_MODULE,
.of_match_table = falcon_match,
},
};
int __init pinctrl_falcon_init(void)
{
return platform_driver_register(&pinctrl_falcon_driver);
}
core_initcall_sync(pinctrl_falcon_init);
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