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linux/drivers/pinctrl/pinctrl-st.c
Peter Griffin 147e1468b2 pinctrl: st: Remove STiH415/6 SoC pinctrl driver support. 
STiH415/6 SoC support is being removed from the kernel.
This patch updates the ST pinctrl driver and removes
references to these obsolete platforms. As some structures
referenced by STiH407 based configuration were shared with
STiH416 we update these names to match the remaining
supported platform.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Cc: <linus.walleij@linaro.org>
Cc: <linux-gpio@vger.kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-09-15 15:55:25 +02:00

1687 lines
47 KiB
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/*
* Copyright (C) 2013 STMicroelectronics (R&D) Limited.
* Authors:
* Srinivas Kandagatla <srinivas.kandagatla@st.com>
*
* 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.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_gpio.h>
#include <linux/of_address.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/platform_device.h>
#include "core.h"
/* PIO Block registers */
/* PIO output */
#define REG_PIO_POUT 0x00
/* Set bits of POUT */
#define REG_PIO_SET_POUT 0x04
/* Clear bits of POUT */
#define REG_PIO_CLR_POUT 0x08
/* PIO input */
#define REG_PIO_PIN 0x10
/* PIO configuration */
#define REG_PIO_PC(n) (0x20 + (n) * 0x10)
/* Set bits of PC[2:0] */
#define REG_PIO_SET_PC(n) (0x24 + (n) * 0x10)
/* Clear bits of PC[2:0] */
#define REG_PIO_CLR_PC(n) (0x28 + (n) * 0x10)
/* PIO input comparison */
#define REG_PIO_PCOMP 0x50
/* Set bits of PCOMP */
#define REG_PIO_SET_PCOMP 0x54
/* Clear bits of PCOMP */
#define REG_PIO_CLR_PCOMP 0x58
/* PIO input comparison mask */
#define REG_PIO_PMASK 0x60
/* Set bits of PMASK */
#define REG_PIO_SET_PMASK 0x64
/* Clear bits of PMASK */
#define REG_PIO_CLR_PMASK 0x68
#define ST_GPIO_DIRECTION_BIDIR 0x1
#define ST_GPIO_DIRECTION_OUT 0x2
#define ST_GPIO_DIRECTION_IN 0x4
/**
* Packed style retime configuration.
* There are two registers cfg0 and cfg1 in this style for each bank.
* Each field in this register is 8 bit corresponding to 8 pins in the bank.
*/
#define RT_P_CFGS_PER_BANK 2
#define RT_P_CFG0_CLK1NOTCLK0_FIELD(reg) REG_FIELD(reg, 0, 7)
#define RT_P_CFG0_DELAY_0_FIELD(reg) REG_FIELD(reg, 16, 23)
#define RT_P_CFG0_DELAY_1_FIELD(reg) REG_FIELD(reg, 24, 31)
#define RT_P_CFG1_INVERTCLK_FIELD(reg) REG_FIELD(reg, 0, 7)
#define RT_P_CFG1_RETIME_FIELD(reg) REG_FIELD(reg, 8, 15)
#define RT_P_CFG1_CLKNOTDATA_FIELD(reg) REG_FIELD(reg, 16, 23)
#define RT_P_CFG1_DOUBLE_EDGE_FIELD(reg) REG_FIELD(reg, 24, 31)
/**
* Dedicated style retime Configuration register
* each register is dedicated per pin.
*/
#define RT_D_CFGS_PER_BANK 8
#define RT_D_CFG_CLK_SHIFT 0
#define RT_D_CFG_CLK_MASK (0x3 << 0)
#define RT_D_CFG_CLKNOTDATA_SHIFT 2
#define RT_D_CFG_CLKNOTDATA_MASK BIT(2)
#define RT_D_CFG_DELAY_SHIFT 3
#define RT_D_CFG_DELAY_MASK (0xf << 3)
#define RT_D_CFG_DELAY_INNOTOUT_SHIFT 7
#define RT_D_CFG_DELAY_INNOTOUT_MASK BIT(7)
#define RT_D_CFG_DOUBLE_EDGE_SHIFT 8
#define RT_D_CFG_DOUBLE_EDGE_MASK BIT(8)
#define RT_D_CFG_INVERTCLK_SHIFT 9
#define RT_D_CFG_INVERTCLK_MASK BIT(9)
#define RT_D_CFG_RETIME_SHIFT 10
#define RT_D_CFG_RETIME_MASK BIT(10)
/*
* Pinconf is represented in an opaque unsigned long variable.
* Below is the bit allocation details for each possible configuration.
* All the bit fields can be encapsulated into four variables
* (direction, retime-type, retime-clk, retime-delay)
*
* +----------------+
*[31:28]| reserved-3 |
* +----------------+-------------
*[27] | oe | |
* +----------------+ v
*[26] | pu | [Direction ]
* +----------------+ ^
*[25] | od | |
* +----------------+-------------
*[24] | reserved-2 |
* +----------------+-------------
*[23] | retime | |
* +----------------+ |
*[22] | retime-invclk | |
* +----------------+ v
*[21] |retime-clknotdat| [Retime-type ]
* +----------------+ ^
*[20] | retime-de | |
* +----------------+-------------
*[19:18]| retime-clk |------>[Retime-Clk ]
* +----------------+
*[17:16]| reserved-1 |
* +----------------+
*[15..0]| retime-delay |------>[Retime Delay]
* +----------------+
*/
#define ST_PINCONF_UNPACK(conf, param)\
((conf >> ST_PINCONF_ ##param ##_SHIFT) \
& ST_PINCONF_ ##param ##_MASK)
#define ST_PINCONF_PACK(conf, val, param) (conf |=\
((val & ST_PINCONF_ ##param ##_MASK) << \
ST_PINCONF_ ##param ##_SHIFT))
/* Output enable */
#define ST_PINCONF_OE_MASK 0x1
#define ST_PINCONF_OE_SHIFT 27
#define ST_PINCONF_OE BIT(27)
#define ST_PINCONF_UNPACK_OE(conf) ST_PINCONF_UNPACK(conf, OE)
#define ST_PINCONF_PACK_OE(conf) ST_PINCONF_PACK(conf, 1, OE)
/* Pull Up */
#define ST_PINCONF_PU_MASK 0x1
#define ST_PINCONF_PU_SHIFT 26
#define ST_PINCONF_PU BIT(26)
#define ST_PINCONF_UNPACK_PU(conf) ST_PINCONF_UNPACK(conf, PU)
#define ST_PINCONF_PACK_PU(conf) ST_PINCONF_PACK(conf, 1, PU)
/* Open Drain */
#define ST_PINCONF_OD_MASK 0x1
#define ST_PINCONF_OD_SHIFT 25
#define ST_PINCONF_OD BIT(25)
#define ST_PINCONF_UNPACK_OD(conf) ST_PINCONF_UNPACK(conf, OD)
#define ST_PINCONF_PACK_OD(conf) ST_PINCONF_PACK(conf, 1, OD)
#define ST_PINCONF_RT_MASK 0x1
#define ST_PINCONF_RT_SHIFT 23
#define ST_PINCONF_RT BIT(23)
#define ST_PINCONF_UNPACK_RT(conf) ST_PINCONF_UNPACK(conf, RT)
#define ST_PINCONF_PACK_RT(conf) ST_PINCONF_PACK(conf, 1, RT)
#define ST_PINCONF_RT_INVERTCLK_MASK 0x1
#define ST_PINCONF_RT_INVERTCLK_SHIFT 22
#define ST_PINCONF_RT_INVERTCLK BIT(22)
#define ST_PINCONF_UNPACK_RT_INVERTCLK(conf) \
ST_PINCONF_UNPACK(conf, RT_INVERTCLK)
#define ST_PINCONF_PACK_RT_INVERTCLK(conf) \
ST_PINCONF_PACK(conf, 1, RT_INVERTCLK)
#define ST_PINCONF_RT_CLKNOTDATA_MASK 0x1
#define ST_PINCONF_RT_CLKNOTDATA_SHIFT 21
#define ST_PINCONF_RT_CLKNOTDATA BIT(21)
#define ST_PINCONF_UNPACK_RT_CLKNOTDATA(conf) \
ST_PINCONF_UNPACK(conf, RT_CLKNOTDATA)
#define ST_PINCONF_PACK_RT_CLKNOTDATA(conf) \
ST_PINCONF_PACK(conf, 1, RT_CLKNOTDATA)
#define ST_PINCONF_RT_DOUBLE_EDGE_MASK 0x1
#define ST_PINCONF_RT_DOUBLE_EDGE_SHIFT 20
#define ST_PINCONF_RT_DOUBLE_EDGE BIT(20)
#define ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(conf) \
ST_PINCONF_UNPACK(conf, RT_DOUBLE_EDGE)
#define ST_PINCONF_PACK_RT_DOUBLE_EDGE(conf) \
ST_PINCONF_PACK(conf, 1, RT_DOUBLE_EDGE)
#define ST_PINCONF_RT_CLK_MASK 0x3
#define ST_PINCONF_RT_CLK_SHIFT 18
#define ST_PINCONF_RT_CLK BIT(18)
#define ST_PINCONF_UNPACK_RT_CLK(conf) ST_PINCONF_UNPACK(conf, RT_CLK)
#define ST_PINCONF_PACK_RT_CLK(conf, val) ST_PINCONF_PACK(conf, val, RT_CLK)
/* RETIME_DELAY in Pico Secs */
#define ST_PINCONF_RT_DELAY_MASK 0xffff
#define ST_PINCONF_RT_DELAY_SHIFT 0
#define ST_PINCONF_UNPACK_RT_DELAY(conf) ST_PINCONF_UNPACK(conf, RT_DELAY)
#define ST_PINCONF_PACK_RT_DELAY(conf, val) \
ST_PINCONF_PACK(conf, val, RT_DELAY)
#define ST_GPIO_PINS_PER_BANK (8)
#define OF_GPIO_ARGS_MIN (4)
#define OF_RT_ARGS_MIN (2)
#define gpio_range_to_bank(chip) \
container_of(chip, struct st_gpio_bank, range)
#define pc_to_bank(pc) \
container_of(pc, struct st_gpio_bank, pc)
enum st_retime_style {
st_retime_style_none,
st_retime_style_packed,
st_retime_style_dedicated,
};
struct st_retime_dedicated {
struct regmap_field *rt[ST_GPIO_PINS_PER_BANK];
};
struct st_retime_packed {
struct regmap_field *clk1notclk0;
struct regmap_field *delay_0;
struct regmap_field *delay_1;
struct regmap_field *invertclk;
struct regmap_field *retime;
struct regmap_field *clknotdata;
struct regmap_field *double_edge;
};
struct st_pio_control {
u32 rt_pin_mask;
struct regmap_field *alt, *oe, *pu, *od;
/* retiming */
union {
struct st_retime_packed rt_p;
struct st_retime_dedicated rt_d;
} rt;
};
struct st_pctl_data {
const enum st_retime_style rt_style;
const unsigned int *input_delays;
const int ninput_delays;
const unsigned int *output_delays;
const int noutput_delays;
/* register offset information */
const int alt, oe, pu, od, rt;
};
struct st_pinconf {
int pin;
const char *name;
unsigned long config;
int altfunc;
};
struct st_pmx_func {
const char *name;
const char **groups;
unsigned ngroups;
};
struct st_pctl_group {
const char *name;
unsigned int *pins;
unsigned npins;
struct st_pinconf *pin_conf;
};
/*
* Edge triggers are not supported at hardware level, it is supported by
* software by exploiting the level trigger support in hardware.
* Software uses a virtual register (EDGE_CONF) for edge trigger configuration
* of each gpio pin in a GPIO bank.
*
* Each bank has a 32 bit EDGE_CONF register which is divided in to 8 parts of
* 4-bits. Each 4-bit space is allocated for each pin in a gpio bank.
*
* bit allocation per pin is:
* Bits: [0 - 3] | [4 - 7] [8 - 11] ... ... ... ... [ 28 - 31]
* --------------------------------------------------------
* | pin-0 | pin-2 | pin-3 | ... ... ... ... | pin -7 |
* --------------------------------------------------------
*
* A pin can have one of following the values in its edge configuration field.
*
* ------- ----------------------------
* [0-3] - Description
* ------- ----------------------------
* 0000 - No edge IRQ.
* 0001 - Falling edge IRQ.
* 0010 - Rising edge IRQ.
* 0011 - Rising and Falling edge IRQ.
* ------- ----------------------------
*/
#define ST_IRQ_EDGE_CONF_BITS_PER_PIN 4
#define ST_IRQ_EDGE_MASK 0xf
#define ST_IRQ_EDGE_FALLING BIT(0)
#define ST_IRQ_EDGE_RISING BIT(1)
#define ST_IRQ_EDGE_BOTH (BIT(0) | BIT(1))
#define ST_IRQ_RISING_EDGE_CONF(pin) \
(ST_IRQ_EDGE_RISING << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN))
#define ST_IRQ_FALLING_EDGE_CONF(pin) \
(ST_IRQ_EDGE_FALLING << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN))
#define ST_IRQ_BOTH_EDGE_CONF(pin) \
(ST_IRQ_EDGE_BOTH << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN))
#define ST_IRQ_EDGE_CONF(conf, pin) \
(conf >> (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN) & ST_IRQ_EDGE_MASK)
struct st_gpio_bank {
struct gpio_chip gpio_chip;
struct pinctrl_gpio_range range;
void __iomem *base;
struct st_pio_control pc;
unsigned long irq_edge_conf;
spinlock_t lock;
};
struct st_pinctrl {
struct device *dev;
struct pinctrl_dev *pctl;
struct st_gpio_bank *banks;
int nbanks;
struct st_pmx_func *functions;
int nfunctions;
struct st_pctl_group *groups;
int ngroups;
struct regmap *regmap;
const struct st_pctl_data *data;
void __iomem *irqmux_base;
};
/* SOC specific data */
static const unsigned int stih407_delays[] = {0, 300, 500, 750, 1000, 1250,
1500, 1750, 2000, 2250, 2500, 2750, 3000, 3250 };
static const struct st_pctl_data stih407_data = {
.rt_style = st_retime_style_dedicated,
.input_delays = stih407_delays,
.ninput_delays = ARRAY_SIZE(stih407_delays),
.output_delays = stih407_delays,
.noutput_delays = ARRAY_SIZE(stih407_delays),
.alt = 0, .oe = 40, .pu = 50, .od = 60, .rt = 100,
};
static const struct st_pctl_data stih407_flashdata = {
.rt_style = st_retime_style_none,
.input_delays = stih407_delays,
.ninput_delays = ARRAY_SIZE(stih407_delays),
.output_delays = stih407_delays,
.noutput_delays = ARRAY_SIZE(stih407_delays),
.alt = 0,
.oe = -1, /* Not Available */
.pu = -1, /* Not Available */
.od = 60,
.rt = 100,
};
static struct st_pio_control *st_get_pio_control(
struct pinctrl_dev *pctldev, int pin)
{
struct pinctrl_gpio_range *range =
pinctrl_find_gpio_range_from_pin(pctldev, pin);
struct st_gpio_bank *bank = gpio_range_to_bank(range);
return &bank->pc;
}
/* Low level functions.. */
static inline int st_gpio_bank(int gpio)
{
return gpio/ST_GPIO_PINS_PER_BANK;
}
static inline int st_gpio_pin(int gpio)
{
return gpio%ST_GPIO_PINS_PER_BANK;
}
static void st_pinconf_set_config(struct st_pio_control *pc,
int pin, unsigned long config)
{
struct regmap_field *output_enable = pc->oe;
struct regmap_field *pull_up = pc->pu;
struct regmap_field *open_drain = pc->od;
unsigned int oe_value, pu_value, od_value;
unsigned long mask = BIT(pin);
if (output_enable) {
regmap_field_read(output_enable, &oe_value);
oe_value &= ~mask;
if (config & ST_PINCONF_OE)
oe_value |= mask;
regmap_field_write(output_enable, oe_value);
}
if (pull_up) {
regmap_field_read(pull_up, &pu_value);
pu_value &= ~mask;
if (config & ST_PINCONF_PU)
pu_value |= mask;
regmap_field_write(pull_up, pu_value);
}
if (open_drain) {
regmap_field_read(open_drain, &od_value);
od_value &= ~mask;
if (config & ST_PINCONF_OD)
od_value |= mask;
regmap_field_write(open_drain, od_value);
}
}
static void st_pctl_set_function(struct st_pio_control *pc,
int pin_id, int function)
{
struct regmap_field *alt = pc->alt;
unsigned int val;
int pin = st_gpio_pin(pin_id);
int offset = pin * 4;
if (!alt)
return;
regmap_field_read(alt, &val);
val &= ~(0xf << offset);
val |= function << offset;
regmap_field_write(alt, val);
}
static unsigned int st_pctl_get_pin_function(struct st_pio_control *pc, int pin)
{
struct regmap_field *alt = pc->alt;
unsigned int val;
int offset = pin * 4;
if (!alt)
return 0;
regmap_field_read(alt, &val);
return (val >> offset) & 0xf;
}
static unsigned long st_pinconf_delay_to_bit(unsigned int delay,
const struct st_pctl_data *data, unsigned long config)
{
const unsigned int *delay_times;
int num_delay_times, i, closest_index = -1;
unsigned int closest_divergence = UINT_MAX;
if (ST_PINCONF_UNPACK_OE(config)) {
delay_times = data->output_delays;
num_delay_times = data->noutput_delays;
} else {
delay_times = data->input_delays;
num_delay_times = data->ninput_delays;
}
for (i = 0; i < num_delay_times; i++) {
unsigned int divergence = abs(delay - delay_times[i]);
if (divergence == 0)
return i;
if (divergence < closest_divergence) {
closest_divergence = divergence;
closest_index = i;
}
}
pr_warn("Attempt to set delay %d, closest available %d\n",
delay, delay_times[closest_index]);
return closest_index;
}
static unsigned long st_pinconf_bit_to_delay(unsigned int index,
const struct st_pctl_data *data, unsigned long output)
{
const unsigned int *delay_times;
int num_delay_times;
if (output) {
delay_times = data->output_delays;
num_delay_times = data->noutput_delays;
} else {
delay_times = data->input_delays;
num_delay_times = data->ninput_delays;
}
if (index < num_delay_times) {
return delay_times[index];
} else {
pr_warn("Delay not found in/out delay list\n");
return 0;
}
}
static void st_regmap_field_bit_set_clear_pin(struct regmap_field *field,
int enable, int pin)
{
unsigned int val = 0;
regmap_field_read(field, &val);
if (enable)
val |= BIT(pin);
else
val &= ~BIT(pin);
regmap_field_write(field, val);
}
static void st_pinconf_set_retime_packed(struct st_pinctrl *info,
struct st_pio_control *pc, unsigned long config, int pin)
{
const struct st_pctl_data *data = info->data;
struct st_retime_packed *rt_p = &pc->rt.rt_p;
unsigned int delay;
st_regmap_field_bit_set_clear_pin(rt_p->clk1notclk0,
ST_PINCONF_UNPACK_RT_CLK(config), pin);
st_regmap_field_bit_set_clear_pin(rt_p->clknotdata,
ST_PINCONF_UNPACK_RT_CLKNOTDATA(config), pin);
st_regmap_field_bit_set_clear_pin(rt_p->double_edge,
ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config), pin);
st_regmap_field_bit_set_clear_pin(rt_p->invertclk,
ST_PINCONF_UNPACK_RT_INVERTCLK(config), pin);
st_regmap_field_bit_set_clear_pin(rt_p->retime,
ST_PINCONF_UNPACK_RT(config), pin);
delay = st_pinconf_delay_to_bit(ST_PINCONF_UNPACK_RT_DELAY(config),
data, config);
/* 2 bit delay, lsb */
st_regmap_field_bit_set_clear_pin(rt_p->delay_0, delay & 0x1, pin);
/* 2 bit delay, msb */
st_regmap_field_bit_set_clear_pin(rt_p->delay_1, delay & 0x2, pin);
}
static void st_pinconf_set_retime_dedicated(struct st_pinctrl *info,
struct st_pio_control *pc, unsigned long config, int pin)
{
int input = ST_PINCONF_UNPACK_OE(config) ? 0 : 1;
int clk = ST_PINCONF_UNPACK_RT_CLK(config);
int clknotdata = ST_PINCONF_UNPACK_RT_CLKNOTDATA(config);
int double_edge = ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config);
int invertclk = ST_PINCONF_UNPACK_RT_INVERTCLK(config);
int retime = ST_PINCONF_UNPACK_RT(config);
unsigned long delay = st_pinconf_delay_to_bit(
ST_PINCONF_UNPACK_RT_DELAY(config),
info->data, config);
struct st_retime_dedicated *rt_d = &pc->rt.rt_d;
unsigned long retime_config =
((clk) << RT_D_CFG_CLK_SHIFT) |
((delay) << RT_D_CFG_DELAY_SHIFT) |
((input) << RT_D_CFG_DELAY_INNOTOUT_SHIFT) |
((retime) << RT_D_CFG_RETIME_SHIFT) |
((clknotdata) << RT_D_CFG_CLKNOTDATA_SHIFT) |
((invertclk) << RT_D_CFG_INVERTCLK_SHIFT) |
((double_edge) << RT_D_CFG_DOUBLE_EDGE_SHIFT);
regmap_field_write(rt_d->rt[pin], retime_config);
}
static void st_pinconf_get_direction(struct st_pio_control *pc,
int pin, unsigned long *config)
{
unsigned int oe_value, pu_value, od_value;
if (pc->oe) {
regmap_field_read(pc->oe, &oe_value);
if (oe_value & BIT(pin))
ST_PINCONF_PACK_OE(*config);
}
if (pc->pu) {
regmap_field_read(pc->pu, &pu_value);
if (pu_value & BIT(pin))
ST_PINCONF_PACK_PU(*config);
}
if (pc->od) {
regmap_field_read(pc->od, &od_value);
if (od_value & BIT(pin))
ST_PINCONF_PACK_OD(*config);
}
}
static int st_pinconf_get_retime_packed(struct st_pinctrl *info,
struct st_pio_control *pc, int pin, unsigned long *config)
{
const struct st_pctl_data *data = info->data;
struct st_retime_packed *rt_p = &pc->rt.rt_p;
unsigned int delay_bits, delay, delay0, delay1, val;
int output = ST_PINCONF_UNPACK_OE(*config);
if (!regmap_field_read(rt_p->retime, &val) && (val & BIT(pin)))
ST_PINCONF_PACK_RT(*config);
if (!regmap_field_read(rt_p->clk1notclk0, &val) && (val & BIT(pin)))
ST_PINCONF_PACK_RT_CLK(*config, 1);
if (!regmap_field_read(rt_p->clknotdata, &val) && (val & BIT(pin)))
ST_PINCONF_PACK_RT_CLKNOTDATA(*config);
if (!regmap_field_read(rt_p->double_edge, &val) && (val & BIT(pin)))
ST_PINCONF_PACK_RT_DOUBLE_EDGE(*config);
if (!regmap_field_read(rt_p->invertclk, &val) && (val & BIT(pin)))
ST_PINCONF_PACK_RT_INVERTCLK(*config);
regmap_field_read(rt_p->delay_0, &delay0);
regmap_field_read(rt_p->delay_1, &delay1);
delay_bits = (((delay1 & BIT(pin)) ? 1 : 0) << 1) |
(((delay0 & BIT(pin)) ? 1 : 0));
delay = st_pinconf_bit_to_delay(delay_bits, data, output);
ST_PINCONF_PACK_RT_DELAY(*config, delay);
return 0;
}
static int st_pinconf_get_retime_dedicated(struct st_pinctrl *info,
struct st_pio_control *pc, int pin, unsigned long *config)
{
unsigned int value;
unsigned long delay_bits, delay, rt_clk;
int output = ST_PINCONF_UNPACK_OE(*config);
struct st_retime_dedicated *rt_d = &pc->rt.rt_d;
regmap_field_read(rt_d->rt[pin], &value);
rt_clk = (value & RT_D_CFG_CLK_MASK) >> RT_D_CFG_CLK_SHIFT;
ST_PINCONF_PACK_RT_CLK(*config, rt_clk);
delay_bits = (value & RT_D_CFG_DELAY_MASK) >> RT_D_CFG_DELAY_SHIFT;
delay = st_pinconf_bit_to_delay(delay_bits, info->data, output);
ST_PINCONF_PACK_RT_DELAY(*config, delay);
if (value & RT_D_CFG_CLKNOTDATA_MASK)
ST_PINCONF_PACK_RT_CLKNOTDATA(*config);
if (value & RT_D_CFG_DOUBLE_EDGE_MASK)
ST_PINCONF_PACK_RT_DOUBLE_EDGE(*config);
if (value & RT_D_CFG_INVERTCLK_MASK)
ST_PINCONF_PACK_RT_INVERTCLK(*config);
if (value & RT_D_CFG_RETIME_MASK)
ST_PINCONF_PACK_RT(*config);
return 0;
}
/* GPIO related functions */
static inline void __st_gpio_set(struct st_gpio_bank *bank,
unsigned offset, int value)
{
if (value)
writel(BIT(offset), bank->base + REG_PIO_SET_POUT);
else
writel(BIT(offset), bank->base + REG_PIO_CLR_POUT);
}
static void st_gpio_direction(struct st_gpio_bank *bank,
unsigned int gpio, unsigned int direction)
{
int offset = st_gpio_pin(gpio);
int i = 0;
/**
* There are three configuration registers (PIOn_PC0, PIOn_PC1
* and PIOn_PC2) for each port. These are used to configure the
* PIO port pins. Each pin can be configured as an input, output,
* bidirectional, or alternative function pin. Three bits, one bit
* from each of the three registers, configure the corresponding bit of
* the port. Valid bit settings is:
*
* PC2 PC1 PC0 Direction.
* 0 0 0 [Input Weak pull-up]
* 0 0 or 1 1 [Bidirection]
* 0 1 0 [Output]
* 1 0 0 [Input]
*
* PIOn_SET_PC and PIOn_CLR_PC registers are used to set and clear bits
* individually.
*/
for (i = 0; i <= 2; i++) {
if (direction & BIT(i))
writel(BIT(offset), bank->base + REG_PIO_SET_PC(i));
else
writel(BIT(offset), bank->base + REG_PIO_CLR_PC(i));
}
}
static int st_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct st_gpio_bank *bank = gpiochip_get_data(chip);
return !!(readl(bank->base + REG_PIO_PIN) & BIT(offset));
}
static void st_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct st_gpio_bank *bank = gpiochip_get_data(chip);
__st_gpio_set(bank, offset, value);
}
static int st_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
pinctrl_gpio_direction_input(chip->base + offset);
return 0;
}
static int st_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
struct st_gpio_bank *bank = gpiochip_get_data(chip);
__st_gpio_set(bank, offset, value);
pinctrl_gpio_direction_output(chip->base + offset);
return 0;
}
static int st_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
{
struct st_gpio_bank *bank = gpiochip_get_data(chip);
struct st_pio_control pc = bank->pc;
unsigned long config;
unsigned int direction = 0;
unsigned int function;
unsigned int value;
int i = 0;
/* Alternate function direction is handled by Pinctrl */
function = st_pctl_get_pin_function(&pc, offset);
if (function) {
st_pinconf_get_direction(&pc, offset, &config);
return !ST_PINCONF_UNPACK_OE(config);
}
/*
* GPIO direction is handled differently
* - See st_gpio_direction() above for an explanation
*/
for (i = 0; i <= 2; i++) {
value = readl(bank->base + REG_PIO_PC(i));
direction |= ((value >> offset) & 0x1) << i;
}
return (direction == ST_GPIO_DIRECTION_IN);
}
/* Pinctrl Groups */
static int st_pctl_get_groups_count(struct pinctrl_dev *pctldev)
{
struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
return info->ngroups;
}
static const char *st_pctl_get_group_name(struct pinctrl_dev *pctldev,
unsigned selector)
{
struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
return info->groups[selector].name;
}
static int st_pctl_get_group_pins(struct pinctrl_dev *pctldev,
unsigned selector, const unsigned **pins, unsigned *npins)
{
struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
if (selector >= info->ngroups)
return -EINVAL;
*pins = info->groups[selector].pins;
*npins = info->groups[selector].npins;
return 0;
}
static inline const struct st_pctl_group *st_pctl_find_group_by_name(
const struct st_pinctrl *info, const char *name)
{
int i;
for (i = 0; i < info->ngroups; i++) {
if (!strcmp(info->groups[i].name, name))
return &info->groups[i];
}
return NULL;
}
static int st_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np, struct pinctrl_map **map, unsigned *num_maps)
{
struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
const struct st_pctl_group *grp;
struct pinctrl_map *new_map;
struct device_node *parent;
int map_num, i;
grp = st_pctl_find_group_by_name(info, np->name);
if (!grp) {
dev_err(info->dev, "unable to find group for node %s\n",
np->name);
return -EINVAL;
}
map_num = grp->npins + 1;
new_map = devm_kzalloc(pctldev->dev,
sizeof(*new_map) * map_num, GFP_KERNEL);
if (!new_map)
return -ENOMEM;
parent = of_get_parent(np);
if (!parent) {
devm_kfree(pctldev->dev, new_map);
return -EINVAL;
}
*map = new_map;
*num_maps = map_num;
new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
new_map[0].data.mux.function = parent->name;
new_map[0].data.mux.group = np->name;
of_node_put(parent);
/* create config map per pin */
new_map++;
for (i = 0; i < grp->npins; i++) {
new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN;
new_map[i].data.configs.group_or_pin =
pin_get_name(pctldev, grp->pins[i]);
new_map[i].data.configs.configs = &grp->pin_conf[i].config;
new_map[i].data.configs.num_configs = 1;
}
dev_info(pctldev->dev, "maps: function %s group %s num %d\n",
(*map)->data.mux.function, grp->name, map_num);
return 0;
}
static void st_pctl_dt_free_map(struct pinctrl_dev *pctldev,
struct pinctrl_map *map, unsigned num_maps)
{
}
static struct pinctrl_ops st_pctlops = {
.get_groups_count = st_pctl_get_groups_count,
.get_group_pins = st_pctl_get_group_pins,
.get_group_name = st_pctl_get_group_name,
.dt_node_to_map = st_pctl_dt_node_to_map,
.dt_free_map = st_pctl_dt_free_map,
};
/* Pinmux */
static int st_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
{
struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
return info->nfunctions;
}
static const char *st_pmx_get_fname(struct pinctrl_dev *pctldev,
unsigned selector)
{
struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
return info->functions[selector].name;
}
static int st_pmx_get_groups(struct pinctrl_dev *pctldev,
unsigned selector, const char * const **grps, unsigned * const ngrps)
{
struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
*grps = info->functions[selector].groups;
*ngrps = info->functions[selector].ngroups;
return 0;
}
static int st_pmx_set_mux(struct pinctrl_dev *pctldev, unsigned fselector,
unsigned group)
{
struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
struct st_pinconf *conf = info->groups[group].pin_conf;
struct st_pio_control *pc;
int i;
for (i = 0; i < info->groups[group].npins; i++) {
pc = st_get_pio_control(pctldev, conf[i].pin);
st_pctl_set_function(pc, conf[i].pin, conf[i].altfunc);
}
return 0;
}
static int st_pmx_set_gpio_direction(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range, unsigned gpio,
bool input)
{
struct st_gpio_bank *bank = gpio_range_to_bank(range);
/*
* When a PIO bank is used in its primary function mode (altfunc = 0)
* Output Enable (OE), Open Drain(OD), and Pull Up (PU)
* for the primary PIO functions are driven by the related PIO block
*/
st_pctl_set_function(&bank->pc, gpio, 0);
st_gpio_direction(bank, gpio, input ?
ST_GPIO_DIRECTION_IN : ST_GPIO_DIRECTION_OUT);
return 0;
}
static struct pinmux_ops st_pmxops = {
.get_functions_count = st_pmx_get_funcs_count,
.get_function_name = st_pmx_get_fname,
.get_function_groups = st_pmx_get_groups,
.set_mux = st_pmx_set_mux,
.gpio_set_direction = st_pmx_set_gpio_direction,
.strict = true,
};
/* Pinconf */
static void st_pinconf_get_retime(struct st_pinctrl *info,
struct st_pio_control *pc, int pin, unsigned long *config)
{
if (info->data->rt_style == st_retime_style_packed)
st_pinconf_get_retime_packed(info, pc, pin, config);
else if (info->data->rt_style == st_retime_style_dedicated)
if ((BIT(pin) & pc->rt_pin_mask))
st_pinconf_get_retime_dedicated(info, pc,
pin, config);
}
static void st_pinconf_set_retime(struct st_pinctrl *info,
struct st_pio_control *pc, int pin, unsigned long config)
{
if (info->data->rt_style == st_retime_style_packed)
st_pinconf_set_retime_packed(info, pc, config, pin);
else if (info->data->rt_style == st_retime_style_dedicated)
if ((BIT(pin) & pc->rt_pin_mask))
st_pinconf_set_retime_dedicated(info, pc,
config, pin);
}
static int st_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin_id,
unsigned long *configs, unsigned num_configs)
{
int pin = st_gpio_pin(pin_id);
struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
struct st_pio_control *pc = st_get_pio_control(pctldev, pin_id);
int i;
for (i = 0; i < num_configs; i++) {
st_pinconf_set_config(pc, pin, configs[i]);
st_pinconf_set_retime(info, pc, pin, configs[i]);
} /* for each config */
return 0;
}
static int st_pinconf_get(struct pinctrl_dev *pctldev,
unsigned pin_id, unsigned long *config)
{
int pin = st_gpio_pin(pin_id);
struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
struct st_pio_control *pc = st_get_pio_control(pctldev, pin_id);
*config = 0;
st_pinconf_get_direction(pc, pin, config);
st_pinconf_get_retime(info, pc, pin, config);
return 0;
}
static void st_pinconf_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned pin_id)
{
struct st_pio_control *pc;
unsigned long config;
unsigned int function;
int offset = st_gpio_pin(pin_id);
char f[16];
mutex_unlock(&pctldev->mutex);
pc = st_get_pio_control(pctldev, pin_id);
st_pinconf_get(pctldev, pin_id, &config);
mutex_lock(&pctldev->mutex);
function = st_pctl_get_pin_function(pc, offset);
if (function)
snprintf(f, 10, "Alt Fn %d", function);
else
snprintf(f, 5, "GPIO");
seq_printf(s, "[OE:%d,PU:%ld,OD:%ld]\t%s\n"
"\t\t[retime:%ld,invclk:%ld,clknotdat:%ld,"
"de:%ld,rt-clk:%ld,rt-delay:%ld]",
!st_gpio_get_direction(&pc_to_bank(pc)->gpio_chip, offset),
ST_PINCONF_UNPACK_PU(config),
ST_PINCONF_UNPACK_OD(config),
f,
ST_PINCONF_UNPACK_RT(config),
ST_PINCONF_UNPACK_RT_INVERTCLK(config),
ST_PINCONF_UNPACK_RT_CLKNOTDATA(config),
ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config),
ST_PINCONF_UNPACK_RT_CLK(config),
ST_PINCONF_UNPACK_RT_DELAY(config));
}
static struct pinconf_ops st_confops = {
.pin_config_get = st_pinconf_get,
.pin_config_set = st_pinconf_set,
.pin_config_dbg_show = st_pinconf_dbg_show,
};
static void st_pctl_dt_child_count(struct st_pinctrl *info,
struct device_node *np)
{
struct device_node *child;
for_each_child_of_node(np, child) {
if (of_property_read_bool(child, "gpio-controller")) {
info->nbanks++;
} else {
info->nfunctions++;
info->ngroups += of_get_child_count(child);
}
}
}
static int st_pctl_dt_setup_retime_packed(struct st_pinctrl *info,
int bank, struct st_pio_control *pc)
{
struct device *dev = info->dev;
struct regmap *rm = info->regmap;
const struct st_pctl_data *data = info->data;
/* 2 registers per bank */
int reg = (data->rt + bank * RT_P_CFGS_PER_BANK) * 4;
struct st_retime_packed *rt_p = &pc->rt.rt_p;
/* cfg0 */
struct reg_field clk1notclk0 = RT_P_CFG0_CLK1NOTCLK0_FIELD(reg);
struct reg_field delay_0 = RT_P_CFG0_DELAY_0_FIELD(reg);
struct reg_field delay_1 = RT_P_CFG0_DELAY_1_FIELD(reg);
/* cfg1 */
struct reg_field invertclk = RT_P_CFG1_INVERTCLK_FIELD(reg + 4);
struct reg_field retime = RT_P_CFG1_RETIME_FIELD(reg + 4);
struct reg_field clknotdata = RT_P_CFG1_CLKNOTDATA_FIELD(reg + 4);
struct reg_field double_edge = RT_P_CFG1_DOUBLE_EDGE_FIELD(reg + 4);
rt_p->clk1notclk0 = devm_regmap_field_alloc(dev, rm, clk1notclk0);
rt_p->delay_0 = devm_regmap_field_alloc(dev, rm, delay_0);
rt_p->delay_1 = devm_regmap_field_alloc(dev, rm, delay_1);
rt_p->invertclk = devm_regmap_field_alloc(dev, rm, invertclk);
rt_p->retime = devm_regmap_field_alloc(dev, rm, retime);
rt_p->clknotdata = devm_regmap_field_alloc(dev, rm, clknotdata);
rt_p->double_edge = devm_regmap_field_alloc(dev, rm, double_edge);
if (IS_ERR(rt_p->clk1notclk0) || IS_ERR(rt_p->delay_0) ||
IS_ERR(rt_p->delay_1) || IS_ERR(rt_p->invertclk) ||
IS_ERR(rt_p->retime) || IS_ERR(rt_p->clknotdata) ||
IS_ERR(rt_p->double_edge))
return -EINVAL;
return 0;
}
static int st_pctl_dt_setup_retime_dedicated(struct st_pinctrl *info,
int bank, struct st_pio_control *pc)
{
struct device *dev = info->dev;
struct regmap *rm = info->regmap;
const struct st_pctl_data *data = info->data;
/* 8 registers per bank */
int reg_offset = (data->rt + bank * RT_D_CFGS_PER_BANK) * 4;
struct st_retime_dedicated *rt_d = &pc->rt.rt_d;
unsigned int j;
u32 pin_mask = pc->rt_pin_mask;
for (j = 0; j < RT_D_CFGS_PER_BANK; j++) {
if (BIT(j) & pin_mask) {
struct reg_field reg = REG_FIELD(reg_offset, 0, 31);
rt_d->rt[j] = devm_regmap_field_alloc(dev, rm, reg);
if (IS_ERR(rt_d->rt[j]))
return -EINVAL;
reg_offset += 4;
}
}
return 0;
}
static int st_pctl_dt_setup_retime(struct st_pinctrl *info,
int bank, struct st_pio_control *pc)
{
const struct st_pctl_data *data = info->data;
if (data->rt_style == st_retime_style_packed)
return st_pctl_dt_setup_retime_packed(info, bank, pc);
else if (data->rt_style == st_retime_style_dedicated)
return st_pctl_dt_setup_retime_dedicated(info, bank, pc);
return -EINVAL;
}
static struct regmap_field *st_pc_get_value(struct device *dev,
struct regmap *regmap, int bank,
int data, int lsb, int msb)
{
struct reg_field reg = REG_FIELD((data + bank) * 4, lsb, msb);
if (data < 0)
return NULL;
return devm_regmap_field_alloc(dev, regmap, reg);
}
static void st_parse_syscfgs(struct st_pinctrl *info, int bank,
struct device_node *np)
{
const struct st_pctl_data *data = info->data;
/**
* For a given shared register like OE/PU/OD, there are 8 bits per bank
* 0:7 belongs to bank0, 8:15 belongs to bank1 ...
* So each register is shared across 4 banks.
*/
int lsb = (bank%4) * ST_GPIO_PINS_PER_BANK;
int msb = lsb + ST_GPIO_PINS_PER_BANK - 1;
struct st_pio_control *pc = &info->banks[bank].pc;
struct device *dev = info->dev;
struct regmap *regmap = info->regmap;
pc->alt = st_pc_get_value(dev, regmap, bank, data->alt, 0, 31);
pc->oe = st_pc_get_value(dev, regmap, bank/4, data->oe, lsb, msb);
pc->pu = st_pc_get_value(dev, regmap, bank/4, data->pu, lsb, msb);
pc->od = st_pc_get_value(dev, regmap, bank/4, data->od, lsb, msb);
/* retime avaiable for all pins by default */
pc->rt_pin_mask = 0xff;
of_property_read_u32(np, "st,retime-pin-mask", &pc->rt_pin_mask);
st_pctl_dt_setup_retime(info, bank, pc);
return;
}
/*
* Each pin is represented in of the below forms.
* <bank offset mux direction rt_type rt_delay rt_clk>
*/
static int st_pctl_dt_parse_groups(struct device_node *np,
struct st_pctl_group *grp, struct st_pinctrl *info, int idx)
{
/* bank pad direction val altfunction */
const __be32 *list;
struct property *pp;
struct st_pinconf *conf;
struct device_node *pins;
int i = 0, npins = 0, nr_props;
pins = of_get_child_by_name(np, "st,pins");
if (!pins)
return -ENODATA;
for_each_property_of_node(pins, pp) {
/* Skip those we do not want to proceed */
if (!strcmp(pp->name, "name"))
continue;
if (pp && (pp->length/sizeof(__be32)) >= OF_GPIO_ARGS_MIN) {
npins++;
} else {
pr_warn("Invalid st,pins in %s node\n", np->name);
return -EINVAL;
}
}
grp->npins = npins;
grp->name = np->name;
grp->pins = devm_kzalloc(info->dev, npins * sizeof(u32), GFP_KERNEL);
grp->pin_conf = devm_kzalloc(info->dev,
npins * sizeof(*conf), GFP_KERNEL);
if (!grp->pins || !grp->pin_conf)
return -ENOMEM;
/* <bank offset mux direction rt_type rt_delay rt_clk> */
for_each_property_of_node(pins, pp) {
if (!strcmp(pp->name, "name"))
continue;
nr_props = pp->length/sizeof(u32);
list = pp->value;
conf = &grp->pin_conf[i];
/* bank & offset */
be32_to_cpup(list++);
be32_to_cpup(list++);
conf->pin = of_get_named_gpio(pins, pp->name, 0);
conf->name = pp->name;
grp->pins[i] = conf->pin;
/* mux */
conf->altfunc = be32_to_cpup(list++);
conf->config = 0;
/* direction */
conf->config |= be32_to_cpup(list++);
/* rt_type rt_delay rt_clk */
if (nr_props >= OF_GPIO_ARGS_MIN + OF_RT_ARGS_MIN) {
/* rt_type */
conf->config |= be32_to_cpup(list++);
/* rt_delay */
conf->config |= be32_to_cpup(list++);
/* rt_clk */
if (nr_props > OF_GPIO_ARGS_MIN + OF_RT_ARGS_MIN)
conf->config |= be32_to_cpup(list++);
}
i++;
}
of_node_put(pins);
return 0;
}
static int st_pctl_parse_functions(struct device_node *np,
struct st_pinctrl *info, u32 index, int *grp_index)
{
struct device_node *child;
struct st_pmx_func *func;
struct st_pctl_group *grp;
int ret, i;
func = &info->functions[index];
func->name = np->name;
func->ngroups = of_get_child_count(np);
if (func->ngroups == 0) {
dev_err(info->dev, "No groups defined\n");
return -EINVAL;
}
func->groups = devm_kzalloc(info->dev,
func->ngroups * sizeof(char *), GFP_KERNEL);
if (!func->groups)
return -ENOMEM;
i = 0;
for_each_child_of_node(np, child) {
func->groups[i] = child->name;
grp = &info->groups[*grp_index];
*grp_index += 1;
ret = st_pctl_dt_parse_groups(child, grp, info, i++);
if (ret)
return ret;
}
dev_info(info->dev, "Function[%d\t name:%s,\tgroups:%d]\n",
index, func->name, func->ngroups);
return 0;
}
static void st_gpio_irq_mask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct st_gpio_bank *bank = gpiochip_get_data(gc);
writel(BIT(d->hwirq), bank->base + REG_PIO_CLR_PMASK);
}
static void st_gpio_irq_unmask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct st_gpio_bank *bank = gpiochip_get_data(gc);
writel(BIT(d->hwirq), bank->base + REG_PIO_SET_PMASK);
}
static int st_gpio_irq_set_type(struct irq_data *d, unsigned type)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct st_gpio_bank *bank = gpiochip_get_data(gc);
unsigned long flags;
int comp, pin = d->hwirq;
u32 val;
u32 pin_edge_conf = 0;
switch (type) {
case IRQ_TYPE_LEVEL_HIGH:
comp = 0;
break;
case IRQ_TYPE_EDGE_FALLING:
comp = 0;
pin_edge_conf = ST_IRQ_FALLING_EDGE_CONF(pin);
break;
case IRQ_TYPE_LEVEL_LOW:
comp = 1;
break;
case IRQ_TYPE_EDGE_RISING:
comp = 1;
pin_edge_conf = ST_IRQ_RISING_EDGE_CONF(pin);
break;
case IRQ_TYPE_EDGE_BOTH:
comp = st_gpio_get(&bank->gpio_chip, pin);
pin_edge_conf = ST_IRQ_BOTH_EDGE_CONF(pin);
break;
default:
return -EINVAL;
}
spin_lock_irqsave(&bank->lock, flags);
bank->irq_edge_conf &= ~(ST_IRQ_EDGE_MASK << (
pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN));
bank->irq_edge_conf |= pin_edge_conf;
spin_unlock_irqrestore(&bank->lock, flags);
val = readl(bank->base + REG_PIO_PCOMP);
val &= ~BIT(pin);
val |= (comp << pin);
writel(val, bank->base + REG_PIO_PCOMP);
return 0;
}
/*
* As edge triggers are not supported at hardware level, it is supported by
* software by exploiting the level trigger support in hardware.
*
* Steps for detection raising edge interrupt in software.
*
* Step 1: CONFIGURE pin to detect level LOW interrupts.
*
* Step 2: DETECT level LOW interrupt and in irqmux/gpio bank interrupt handler,
* if the value of pin is low, then CONFIGURE pin for level HIGH interrupt.
* IGNORE calling the actual interrupt handler for the pin at this stage.
*
* Step 3: DETECT level HIGH interrupt and in irqmux/gpio-bank interrupt handler
* if the value of pin is HIGH, CONFIGURE pin for level LOW interrupt and then
* DISPATCH the interrupt to the interrupt handler of the pin.
*
* step-1 ________ __________
* | | step - 3
* | |
* step -2 |_____|
*
* falling edge is also detected int the same way.
*
*/
static void __gpio_irq_handler(struct st_gpio_bank *bank)
{
unsigned long port_in, port_mask, port_comp, active_irqs;
unsigned long bank_edge_mask, flags;
int n, val, ecfg;
spin_lock_irqsave(&bank->lock, flags);
bank_edge_mask = bank->irq_edge_conf;
spin_unlock_irqrestore(&bank->lock, flags);
for (;;) {
port_in = readl(bank->base + REG_PIO_PIN);
port_comp = readl(bank->base + REG_PIO_PCOMP);
port_mask = readl(bank->base + REG_PIO_PMASK);
active_irqs = (port_in ^ port_comp) & port_mask;
if (active_irqs == 0)
break;
for_each_set_bit(n, &active_irqs, BITS_PER_LONG) {
/* check if we are detecting fake edges ... */
ecfg = ST_IRQ_EDGE_CONF(bank_edge_mask, n);
if (ecfg) {
/* edge detection. */
val = st_gpio_get(&bank->gpio_chip, n);
writel(BIT(n),
val ? bank->base + REG_PIO_SET_PCOMP :
bank->base + REG_PIO_CLR_PCOMP);
if (ecfg != ST_IRQ_EDGE_BOTH &&
!((ecfg & ST_IRQ_EDGE_FALLING) ^ val))
continue;
}
generic_handle_irq(irq_find_mapping(bank->gpio_chip.irqdomain, n));
}
}
}
static void st_gpio_irq_handler(struct irq_desc *desc)
{
/* interrupt dedicated per bank */
struct irq_chip *chip = irq_desc_get_chip(desc);
struct gpio_chip *gc = irq_desc_get_handler_data(desc);
struct st_gpio_bank *bank = gpiochip_get_data(gc);
chained_irq_enter(chip, desc);
__gpio_irq_handler(bank);
chained_irq_exit(chip, desc);
}
static void st_gpio_irqmux_handler(struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
struct st_pinctrl *info = irq_desc_get_handler_data(desc);
unsigned long status;
int n;
chained_irq_enter(chip, desc);
status = readl(info->irqmux_base);
for_each_set_bit(n, &status, info->nbanks)
__gpio_irq_handler(&info->banks[n]);
chained_irq_exit(chip, desc);
}
static struct gpio_chip st_gpio_template = {
.request = gpiochip_generic_request,
.free = gpiochip_generic_free,
.get = st_gpio_get,
.set = st_gpio_set,
.direction_input = st_gpio_direction_input,
.direction_output = st_gpio_direction_output,
.get_direction = st_gpio_get_direction,
.ngpio = ST_GPIO_PINS_PER_BANK,
};
static struct irq_chip st_gpio_irqchip = {
.name = "GPIO",
.irq_disable = st_gpio_irq_mask,
.irq_mask = st_gpio_irq_mask,
.irq_unmask = st_gpio_irq_unmask,
.irq_set_type = st_gpio_irq_set_type,
.flags = IRQCHIP_SKIP_SET_WAKE,
};
static int st_gpiolib_register_bank(struct st_pinctrl *info,
int bank_nr, struct device_node *np)
{
struct st_gpio_bank *bank = &info->banks[bank_nr];
struct pinctrl_gpio_range *range = &bank->range;
struct device *dev = info->dev;
int bank_num = of_alias_get_id(np, "gpio");
struct resource res, irq_res;
int gpio_irq = 0, err;
if (of_address_to_resource(np, 0, &res))
return -ENODEV;
bank->base = devm_ioremap_resource(dev, &res);
if (IS_ERR(bank->base))
return PTR_ERR(bank->base);
bank->gpio_chip = st_gpio_template;
bank->gpio_chip.base = bank_num * ST_GPIO_PINS_PER_BANK;
bank->gpio_chip.ngpio = ST_GPIO_PINS_PER_BANK;
bank->gpio_chip.of_node = np;
bank->gpio_chip.parent = dev;
spin_lock_init(&bank->lock);
of_property_read_string(np, "st,bank-name", &range->name);
bank->gpio_chip.label = range->name;
range->id = bank_num;
range->pin_base = range->base = range->id * ST_GPIO_PINS_PER_BANK;
range->npins = bank->gpio_chip.ngpio;
range->gc = &bank->gpio_chip;
err = gpiochip_add_data(&bank->gpio_chip, bank);
if (err) {
dev_err(dev, "Failed to add gpiochip(%d)!\n", bank_num);
return err;
}
dev_info(dev, "%s bank added.\n", range->name);
/**
* GPIO bank can have one of the two possible types of
* interrupt-wirings.
*
* First type is via irqmux, single interrupt is used by multiple
* gpio banks. This reduces number of overall interrupts numbers
* required. All these banks belong to a single pincontroller.
* _________
* | |----> [gpio-bank (n) ]
* | |----> [gpio-bank (n + 1)]
* [irqN]-- | irq-mux |----> [gpio-bank (n + 2)]
* | |----> [gpio-bank (... )]
* |_________|----> [gpio-bank (n + 7)]
*
* Second type has a dedicated interrupt per each gpio bank.
*
* [irqN]----> [gpio-bank (n)]
*/
if (of_irq_to_resource(np, 0, &irq_res)) {
gpio_irq = irq_res.start;
gpiochip_set_chained_irqchip(&bank->gpio_chip, &st_gpio_irqchip,
gpio_irq, st_gpio_irq_handler);
}
if (info->irqmux_base || gpio_irq > 0) {
err = gpiochip_irqchip_add(&bank->gpio_chip, &st_gpio_irqchip,
0, handle_simple_irq,
IRQ_TYPE_LEVEL_LOW);
if (err) {
gpiochip_remove(&bank->gpio_chip);
dev_info(dev, "could not add irqchip\n");
return err;
}
} else {
dev_info(dev, "No IRQ support for %s bank\n", np->full_name);
}
return 0;
}
static const struct of_device_id st_pctl_of_match[] = {
{ .compatible = "st,stih407-sbc-pinctrl", .data = &stih407_data},
{ .compatible = "st,stih407-front-pinctrl", .data = &stih407_data},
{ .compatible = "st,stih407-rear-pinctrl", .data = &stih407_data},
{ .compatible = "st,stih407-flash-pinctrl", .data = &stih407_flashdata},
{ /* sentinel */ }
};
static int st_pctl_probe_dt(struct platform_device *pdev,
struct pinctrl_desc *pctl_desc, struct st_pinctrl *info)
{
int ret = 0;
int i = 0, j = 0, k = 0, bank;
struct pinctrl_pin_desc *pdesc;
struct device_node *np = pdev->dev.of_node;
struct device_node *child;
int grp_index = 0;
int irq = 0;
struct resource *res;
st_pctl_dt_child_count(info, np);
if (!info->nbanks) {
dev_err(&pdev->dev, "you need atleast one gpio bank\n");
return -EINVAL;
}
dev_info(&pdev->dev, "nbanks = %d\n", info->nbanks);
dev_info(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
dev_info(&pdev->dev, "ngroups = %d\n", info->ngroups);
info->functions = devm_kzalloc(&pdev->dev,
info->nfunctions * sizeof(*info->functions), GFP_KERNEL);
info->groups = devm_kzalloc(&pdev->dev,
info->ngroups * sizeof(*info->groups) , GFP_KERNEL);
info->banks = devm_kzalloc(&pdev->dev,
info->nbanks * sizeof(*info->banks), GFP_KERNEL);
if (!info->functions || !info->groups || !info->banks)
return -ENOMEM;
info->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
if (IS_ERR(info->regmap)) {
dev_err(info->dev, "No syscfg phandle specified\n");
return PTR_ERR(info->regmap);
}
info->data = of_match_node(st_pctl_of_match, np)->data;
irq = platform_get_irq(pdev, 0);
if (irq > 0) {
res = platform_get_resource_byname(pdev,
IORESOURCE_MEM, "irqmux");
info->irqmux_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(info->irqmux_base))
return PTR_ERR(info->irqmux_base);
irq_set_chained_handler_and_data(irq, st_gpio_irqmux_handler,
info);
}
pctl_desc->npins = info->nbanks * ST_GPIO_PINS_PER_BANK;
pdesc = devm_kzalloc(&pdev->dev,
sizeof(*pdesc) * pctl_desc->npins, GFP_KERNEL);
if (!pdesc)
return -ENOMEM;
pctl_desc->pins = pdesc;
bank = 0;
for_each_child_of_node(np, child) {
if (of_property_read_bool(child, "gpio-controller")) {
const char *bank_name = NULL;
ret = st_gpiolib_register_bank(info, bank, child);
if (ret)
return ret;
k = info->banks[bank].range.pin_base;
bank_name = info->banks[bank].range.name;
for (j = 0; j < ST_GPIO_PINS_PER_BANK; j++, k++) {
pdesc->number = k;
pdesc->name = kasprintf(GFP_KERNEL, "%s[%d]",
bank_name, j);
pdesc++;
}
st_parse_syscfgs(info, bank, child);
bank++;
} else {
ret = st_pctl_parse_functions(child, info,
i++, &grp_index);
if (ret) {
dev_err(&pdev->dev, "No functions found.\n");
return ret;
}
}
}
return 0;
}
static int st_pctl_probe(struct platform_device *pdev)
{
struct st_pinctrl *info;
struct pinctrl_desc *pctl_desc;
int ret, i;
if (!pdev->dev.of_node) {
dev_err(&pdev->dev, "device node not found.\n");
return -EINVAL;
}
pctl_desc = devm_kzalloc(&pdev->dev, sizeof(*pctl_desc), GFP_KERNEL);
if (!pctl_desc)
return -ENOMEM;
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->dev = &pdev->dev;
platform_set_drvdata(pdev, info);
ret = st_pctl_probe_dt(pdev, pctl_desc, info);
if (ret)
return ret;
pctl_desc->owner = THIS_MODULE;
pctl_desc->pctlops = &st_pctlops;
pctl_desc->pmxops = &st_pmxops;
pctl_desc->confops = &st_confops;
pctl_desc->name = dev_name(&pdev->dev);
info->pctl = devm_pinctrl_register(&pdev->dev, pctl_desc, info);
if (IS_ERR(info->pctl)) {
dev_err(&pdev->dev, "Failed pinctrl registration\n");
return PTR_ERR(info->pctl);
}
for (i = 0; i < info->nbanks; i++)
pinctrl_add_gpio_range(info->pctl, &info->banks[i].range);
return 0;
}
static struct platform_driver st_pctl_driver = {
.driver = {
.name = "st-pinctrl",
.of_match_table = st_pctl_of_match,
},
.probe = st_pctl_probe,
};
static int __init st_pctl_init(void)
{
return platform_driver_register(&st_pctl_driver);
}
arch_initcall(st_pctl_init);
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