425 lines
11 KiB
C
425 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Take linux kernel driver drivers/gpio/gpio-pca953x.c for reference.
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*
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* Copyright (C) 2016 Peng Fan <van.freenix@gmail.com>
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*
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*/
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/*
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* Note:
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* The driver's compatible table is borrowed from Linux Kernel,
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* but now max supported gpio pins is 24 and only PCA953X_TYPE
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* is supported. PCA957X_TYPE is not supported now.
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* Also the Polarity Inversion feature is not supported now.
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*
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* TODO:
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* 1. Support PCA957X_TYPE
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* 2. Support Polarity Inversion
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*/
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#include <common.h>
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#include <errno.h>
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#include <dm.h>
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#include <fdtdec.h>
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#include <i2c.h>
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#include <malloc.h>
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#include <asm/gpio.h>
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#include <asm/io.h>
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#include <dm/device_compat.h>
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#include <dt-bindings/gpio/gpio.h>
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#include <linux/bitops.h>
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#define PCA953X_INPUT 0
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#define PCA953X_OUTPUT 1
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#define PCA953X_INVERT 2
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#define PCA953X_DIRECTION 3
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#define PCA957X_INPUT 0
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#define PCA957X_OUTPUT 5
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#define PCA957X_INVERT 1
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#define PCA957X_DIRECTION 4
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#define PCA_GPIO_MASK 0x00FF
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#define PCA_INT 0x0100
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#define PCA_PCAL BIT(9)
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#define PCA_LATCH_INT (PCA_PCAL | PCA_INT)
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#define PCA953X_TYPE 0x1000
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#define PCA957X_TYPE 0x2000
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#define PCA_TYPE_MASK 0xF000
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#define PCA_CHIP_TYPE(x) ((x) & PCA_TYPE_MASK)
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enum {
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PCA953X_DIRECTION_IN,
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PCA953X_DIRECTION_OUT,
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};
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#define MAX_BANK 5
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#define BANK_SZ 8
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struct pca95xx_reg {
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int input;
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int output;
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int invert;
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int direction;
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};
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static const struct pca95xx_reg pca953x_regs = {
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.direction = PCA953X_DIRECTION,
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.output = PCA953X_OUTPUT,
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.input = PCA953X_INPUT,
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.invert = PCA953X_INVERT,
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};
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static const struct pca95xx_reg pca957x_regs = {
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.direction = PCA957X_DIRECTION,
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.output = PCA957X_OUTPUT,
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.input = PCA957X_INPUT,
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.invert = PCA957X_INVERT,
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};
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/*
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* struct pca953x_info - Data for pca953x/pca957x
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*
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* @dev: udevice structure for the device
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* @addr: i2c slave address
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* @invert: Polarity inversion or not
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* @gpio_count: the number of gpio pins that the device supports
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* @chip_type: indicate the chip type,PCA953X or PCA957X
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* @bank_count: the number of banks that the device supports
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* @reg_output: array to hold the value of output registers
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* @reg_direction: array to hold the value of direction registers
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* @regs: struct to hold the registers addresses
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*/
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struct pca953x_info {
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struct udevice *dev;
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int addr;
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int invert;
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int gpio_count;
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int chip_type;
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int bank_count;
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u8 reg_output[MAX_BANK];
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u8 reg_direction[MAX_BANK];
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const struct pca95xx_reg *regs;
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};
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static int pca953x_write_single(struct udevice *dev, int reg, u8 val,
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int offset)
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{
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struct pca953x_info *info = dev_get_plat(dev);
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int bank_shift = fls((info->gpio_count - 1) / BANK_SZ);
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int off = offset / BANK_SZ;
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int ret = 0;
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ret = dm_i2c_write(dev, (reg << bank_shift) + off, &val, 1);
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if (ret) {
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dev_err(dev, "%s error\n", __func__);
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return ret;
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}
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return 0;
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}
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static int pca953x_read_single(struct udevice *dev, int reg, u8 *val,
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int offset)
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{
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struct pca953x_info *info = dev_get_plat(dev);
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int bank_shift = fls((info->gpio_count - 1) / BANK_SZ);
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int off = offset / BANK_SZ;
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int ret;
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u8 byte;
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ret = dm_i2c_read(dev, (reg << bank_shift) + off, &byte, 1);
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if (ret) {
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dev_err(dev, "%s error\n", __func__);
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return ret;
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}
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*val = byte;
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return 0;
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}
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static int pca953x_read_regs(struct udevice *dev, int reg, u8 *val)
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{
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struct pca953x_info *info = dev_get_plat(dev);
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int ret = 0;
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if (info->gpio_count <= 8) {
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ret = dm_i2c_read(dev, reg, val, 1);
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} else if (info->gpio_count <= 16) {
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ret = dm_i2c_read(dev, reg << 1, val, info->bank_count);
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} else if (info->gpio_count <= 24) {
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/* Auto increment */
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ret = dm_i2c_read(dev, (reg << 2) | 0x80, val,
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info->bank_count);
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} else if (info->gpio_count == 40) {
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/* Auto increment */
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ret = dm_i2c_read(dev, (reg << 3) | 0x80, val,
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info->bank_count);
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} else {
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dev_err(dev, "Unsupported now\n");
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return -EINVAL;
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}
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return ret;
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}
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static int pca953x_write_regs(struct udevice *dev, int reg, u8 *val)
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{
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struct pca953x_info *info = dev_get_plat(dev);
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int ret = 0;
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if (info->gpio_count <= 8) {
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ret = dm_i2c_write(dev, reg, val, 1);
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} else if (info->gpio_count <= 16) {
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ret = dm_i2c_write(dev, reg << 1, val, info->bank_count);
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} else if (info->gpio_count <= 24) {
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/* Auto increment */
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ret = dm_i2c_write(dev, (reg << 2) | 0x80, val,
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info->bank_count);
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} else if (info->gpio_count == 40) {
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/* Auto increment */
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ret = dm_i2c_write(dev, (reg << 3) | 0x80, val, info->bank_count);
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} else {
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return -EINVAL;
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}
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return ret;
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}
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static int pca953x_is_output(struct udevice *dev, int offset)
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{
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struct pca953x_info *info = dev_get_plat(dev);
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int bank = offset / BANK_SZ;
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int off = offset % BANK_SZ;
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/*0: output; 1: input */
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return !(info->reg_direction[bank] & (1 << off));
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}
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static int pca953x_get_value(struct udevice *dev, uint offset)
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{
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struct pca953x_info *info = dev_get_plat(dev);
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int ret;
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u8 val = 0;
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int off = offset % BANK_SZ;
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ret = pca953x_read_single(dev, info->regs->input, &val, offset);
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if (ret)
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return ret;
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return (val >> off) & 0x1;
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}
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static int pca953x_set_value(struct udevice *dev, uint offset, int value)
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{
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struct pca953x_info *info = dev_get_plat(dev);
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int bank = offset / BANK_SZ;
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int off = offset % BANK_SZ;
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u8 val;
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int ret;
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if (value)
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val = info->reg_output[bank] | (1 << off);
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else
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val = info->reg_output[bank] & ~(1 << off);
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ret = pca953x_write_single(dev, info->regs->output, val, offset);
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if (ret)
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return ret;
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info->reg_output[bank] = val;
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return 0;
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}
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static int pca953x_set_direction(struct udevice *dev, uint offset, int dir)
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{
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struct pca953x_info *info = dev_get_plat(dev);
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int bank = offset / BANK_SZ;
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int off = offset % BANK_SZ;
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u8 val;
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int ret;
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if (dir == PCA953X_DIRECTION_IN)
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val = info->reg_direction[bank] | (1 << off);
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else
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val = info->reg_direction[bank] & ~(1 << off);
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ret = pca953x_write_single(dev, info->regs->direction, val, offset);
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if (ret)
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return ret;
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info->reg_direction[bank] = val;
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return 0;
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}
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static int pca953x_direction_input(struct udevice *dev, uint offset)
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{
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return pca953x_set_direction(dev, offset, PCA953X_DIRECTION_IN);
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}
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static int pca953x_direction_output(struct udevice *dev, uint offset, int value)
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{
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/* Configure output value. */
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pca953x_set_value(dev, offset, value);
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/* Configure direction as output. */
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pca953x_set_direction(dev, offset, PCA953X_DIRECTION_OUT);
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return 0;
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}
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static int pca953x_get_function(struct udevice *dev, uint offset)
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{
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if (pca953x_is_output(dev, offset))
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return GPIOF_OUTPUT;
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else
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return GPIOF_INPUT;
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}
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static int pca953x_xlate(struct udevice *dev, struct gpio_desc *desc,
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struct ofnode_phandle_args *args)
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{
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desc->offset = args->args[0];
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desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;
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return 0;
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}
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static const struct dm_gpio_ops pca953x_ops = {
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.direction_input = pca953x_direction_input,
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.direction_output = pca953x_direction_output,
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.get_value = pca953x_get_value,
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.set_value = pca953x_set_value,
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.get_function = pca953x_get_function,
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.xlate = pca953x_xlate,
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};
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static int pca953x_probe(struct udevice *dev)
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{
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struct pca953x_info *info = dev_get_plat(dev);
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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char name[32], label[8], *str;
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int addr;
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ulong driver_data;
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int ret;
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int size;
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const u8 *tmp;
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u8 val[MAX_BANK];
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addr = dev_read_addr(dev);
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if (addr == 0)
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return -ENODEV;
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info->addr = addr;
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driver_data = dev_get_driver_data(dev);
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info->gpio_count = driver_data & PCA_GPIO_MASK;
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if (info->gpio_count > MAX_BANK * BANK_SZ) {
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dev_err(dev, "Max support %d pins now\n", MAX_BANK * BANK_SZ);
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return -EINVAL;
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}
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info->chip_type = PCA_CHIP_TYPE(driver_data);
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if (info->chip_type == PCA953X_TYPE)
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info->regs = &pca953x_regs;
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else
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info->regs = &pca957x_regs;
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info->bank_count = DIV_ROUND_UP(info->gpio_count, BANK_SZ);
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ret = pca953x_read_regs(dev, info->regs->output, info->reg_output);
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if (ret) {
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dev_err(dev, "Error reading output register\n");
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return ret;
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}
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ret = pca953x_read_regs(dev, PCA953X_DIRECTION, info->reg_direction);
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if (ret) {
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dev_err(dev, "Error reading direction register\n");
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return ret;
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}
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tmp = dev_read_prop(dev, "label", &size);
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if (tmp) {
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memcpy(label, tmp, sizeof(label) - 1);
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label[sizeof(label) - 1] = '\0';
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snprintf(name, sizeof(name), "%s@%x_", label, info->addr);
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} else {
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snprintf(name, sizeof(name), "gpio@%x_", info->addr);
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}
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/* Clear the polarity registers to no invert */
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memset(val, 0, MAX_BANK);
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ret = pca953x_write_regs(dev, info->regs->invert, val);
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if (ret < 0) {
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dev_err(dev, "Error writing invert register\n");
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return ret;
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}
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str = strdup(name);
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if (!str)
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return -ENOMEM;
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uc_priv->bank_name = str;
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uc_priv->gpio_count = info->gpio_count;
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dev_dbg(dev, "%s is ready\n", str);
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return 0;
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}
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#define OF_953X(__nrgpio, __int) (ulong)(__nrgpio | PCA953X_TYPE | __int)
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#define OF_957X(__nrgpio, __int) (ulong)(__nrgpio | PCA957X_TYPE | __int)
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static const struct udevice_id pca953x_ids[] = {
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{ .compatible = "nxp,pca9505", .data = OF_953X(40, PCA_INT), },
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{ .compatible = "nxp,pca9534", .data = OF_953X(8, PCA_INT), },
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{ .compatible = "nxp,pca9535", .data = OF_953X(16, PCA_INT), },
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{ .compatible = "nxp,pca9536", .data = OF_953X(4, 0), },
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{ .compatible = "nxp,pca9537", .data = OF_953X(4, PCA_INT), },
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{ .compatible = "nxp,pca9538", .data = OF_953X(8, PCA_INT), },
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{ .compatible = "nxp,pca9539", .data = OF_953X(16, PCA_INT), },
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{ .compatible = "nxp,pca9554", .data = OF_953X(8, PCA_INT), },
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{ .compatible = "nxp,pca9555", .data = OF_953X(16, PCA_INT), },
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{ .compatible = "nxp,pca9556", .data = OF_953X(8, 0), },
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{ .compatible = "nxp,pca9557", .data = OF_953X(8, 0), },
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{ .compatible = "nxp,pca9574", .data = OF_957X(8, PCA_INT), },
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{ .compatible = "nxp,pca9575", .data = OF_957X(16, PCA_INT), },
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{ .compatible = "nxp,pca9698", .data = OF_953X(40, 0), },
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{ .compatible = "nxp,pcal6524", .data = OF_953X(24, PCA_LATCH_INT), },
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{ .compatible = "maxim,max7310", .data = OF_953X(8, 0), },
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{ .compatible = "maxim,max7312", .data = OF_953X(16, PCA_INT), },
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{ .compatible = "maxim,max7313", .data = OF_953X(16, PCA_INT), },
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{ .compatible = "maxim,max7315", .data = OF_953X(8, PCA_INT), },
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{ .compatible = "ti,pca6107", .data = OF_953X(8, PCA_INT), },
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{ .compatible = "ti,tca6408", .data = OF_953X(8, PCA_INT), },
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{ .compatible = "ti,tca6416", .data = OF_953X(16, PCA_INT), },
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{ .compatible = "ti,tca6424", .data = OF_953X(24, PCA_INT), },
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{ .compatible = "ti,tca9539", .data = OF_953X(16, PCA_INT), },
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{ .compatible = "onsemi,pca9654", .data = OF_953X(8, PCA_INT), },
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{ .compatible = "exar,xra1202", .data = OF_953X(8, 0), },
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{ }
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};
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U_BOOT_DRIVER(pca953x) = {
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.name = "pca953x",
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.id = UCLASS_GPIO,
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.ops = &pca953x_ops,
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.probe = pca953x_probe,
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.plat_auto = sizeof(struct pca953x_info),
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.of_match = pca953x_ids,
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};
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