--- /dev/null
+/*
+ * Take linux kernel driver drivers/gpio/gpio-pca953x.c for reference.
+ *
+ * Copyright (C) 2016 Peng Fan <van.freenix@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ */
+
+/*
+ * Note:
+ * The driver's compatible table is borrowed from Linux Kernel,
+ * but now max supported gpio pins is 24 and only PCA953X_TYPE
+ * is supported. PCA957X_TYPE is not supported now.
+ * Also the Polarity Inversion feature is not supported now.
+ *
+ * TODO:
+ * 1. Support PCA957X_TYPE
+ * 2. Support max 40 gpio pins
+ * 3. Support Plolarity Inversion
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <i2c.h>
+#include <malloc.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <dt-bindings/gpio/gpio.h>
+
+#define PCA953X_INPUT 0
+#define PCA953X_OUTPUT 1
+#define PCA953X_INVERT 2
+#define PCA953X_DIRECTION 3
+
+#define PCA_GPIO_MASK 0x00FF
+#define PCA_INT 0x0100
+#define PCA953X_TYPE 0x1000
+#define PCA957X_TYPE 0x2000
+#define PCA_TYPE_MASK 0xF000
+#define PCA_CHIP_TYPE(x) ((x) & PCA_TYPE_MASK)
+
+enum {
+ PCA953X_DIRECTION_IN,
+ PCA953X_DIRECTION_OUT,
+};
+
+#define MAX_BANK 3
+#define BANK_SZ 8
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * struct pca953x_info - Data for pca953x
+ *
+ * @dev: udevice structure for the device
+ * @addr: i2c slave address
+ * @invert: Polarity inversion or not
+ * @gpio_count: the number of gpio pins that the device supports
+ * @chip_type: indicate the chip type,PCA953X or PCA957X
+ * @bank_count: the number of banks that the device supports
+ * @reg_output: array to hold the value of output registers
+ * @reg_direction: array to hold the value of direction registers
+ */
+struct pca953x_info {
+ struct udevice *dev;
+ int addr;
+ int invert;
+ int gpio_count;
+ int chip_type;
+ int bank_count;
+ u8 reg_output[MAX_BANK];
+ u8 reg_direction[MAX_BANK];
+};
+
+static int pca953x_write_single(struct udevice *dev, int reg, u8 val,
+ int offset)
+{
+ struct pca953x_info *info = dev_get_platdata(dev);
+ int bank_shift = fls((info->gpio_count - 1) / BANK_SZ);
+ int off = offset / BANK_SZ;
+ int ret = 0;
+
+ ret = dm_i2c_write(dev, (reg << bank_shift) + off, &val, 1);
+ if (ret) {
+ dev_err(dev, "%s error\n", __func__);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int pca953x_read_single(struct udevice *dev, int reg, u8 *val,
+ int offset)
+{
+ struct pca953x_info *info = dev_get_platdata(dev);
+ int bank_shift = fls((info->gpio_count - 1) / BANK_SZ);
+ int off = offset / BANK_SZ;
+ int ret;
+ u8 byte;
+
+ ret = dm_i2c_read(dev, (reg << bank_shift) + off, &byte, 1);
+ if (ret) {
+ dev_err(dev, "%s error\n", __func__);
+ return ret;
+ }
+
+ *val = byte;
+
+ return 0;
+}
+
+static int pca953x_read_regs(struct udevice *dev, int reg, u8 *val)
+{
+ struct pca953x_info *info = dev_get_platdata(dev);
+ int ret = 0;
+
+ if (info->gpio_count <= 8) {
+ ret = dm_i2c_read(dev, reg, val, 1);
+ } else if (info->gpio_count <= 16) {
+ ret = dm_i2c_read(dev, reg << 1, val, info->bank_count);
+ } else {
+ dev_err(dev, "Unsupported now\n");
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int pca953x_is_output(struct udevice *dev, int offset)
+{
+ struct pca953x_info *info = dev_get_platdata(dev);
+
+ int bank = offset / BANK_SZ;
+ int off = offset % BANK_SZ;
+
+ /*0: output; 1: input */
+ return !(info->reg_direction[bank] & (1 << off));
+}
+
+static int pca953x_get_value(struct udevice *dev, unsigned offset)
+{
+ int ret;
+ u8 val = 0;
+
+ ret = pca953x_read_single(dev, PCA953X_INPUT, &val, offset);
+ if (ret)
+ return ret;
+
+ return (val >> offset) & 0x1;
+}
+
+static int pca953x_set_value(struct udevice *dev, unsigned offset,
+ int value)
+{
+ struct pca953x_info *info = dev_get_platdata(dev);
+ int bank = offset / BANK_SZ;
+ int off = offset % BANK_SZ;
+ u8 val;
+ int ret;
+
+ if (value)
+ val = info->reg_output[bank] | (1 << off);
+ else
+ val = info->reg_output[bank] & ~(1 << off);
+
+ ret = pca953x_write_single(dev, PCA953X_OUTPUT, val, offset);
+ if (ret)
+ return ret;
+
+ info->reg_output[bank] = val;
+
+ return 0;
+}
+
+static int pca953x_set_direction(struct udevice *dev, unsigned offset, int dir)
+{
+ struct pca953x_info *info = dev_get_platdata(dev);
+ int bank = offset / BANK_SZ;
+ int off = offset % BANK_SZ;
+ u8 val;
+ int ret;
+
+ if (dir == PCA953X_DIRECTION_IN)
+ val = info->reg_direction[bank] | (1 << off);
+ else
+ val = info->reg_direction[bank] & ~(1 << off);
+
+ ret = pca953x_write_single(dev, PCA953X_DIRECTION, val, offset);
+ if (ret)
+ return ret;
+
+ info->reg_direction[bank] = val;
+
+ return 0;
+}
+
+static int pca953x_direction_input(struct udevice *dev, unsigned offset)
+{
+ return pca953x_set_direction(dev, offset, PCA953X_DIRECTION_IN);
+}
+
+static int pca953x_direction_output(struct udevice *dev, unsigned offset,
+ int value)
+{
+ /* Configure output value. */
+ pca953x_set_value(dev, offset, value);
+
+ /* Configure direction as output. */
+ pca953x_set_direction(dev, offset, PCA953X_DIRECTION_OUT);
+
+ return 0;
+}
+
+static int pca953x_get_function(struct udevice *dev, unsigned offset)
+{
+ if (pca953x_is_output(dev, offset))
+ return GPIOF_OUTPUT;
+ else
+ return GPIOF_INPUT;
+}
+
+static int pca953x_xlate(struct udevice *dev, struct gpio_desc *desc,
+ struct fdtdec_phandle_args *args)
+{
+ desc->offset = args->args[0];
+ desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;
+
+ return 0;
+}
+
+static const struct dm_gpio_ops pca953x_ops = {
+ .direction_input = pca953x_direction_input,
+ .direction_output = pca953x_direction_output,
+ .get_value = pca953x_get_value,
+ .set_value = pca953x_set_value,
+ .get_function = pca953x_get_function,
+ .xlate = pca953x_xlate,
+};
+
+static int pca953x_probe(struct udevice *dev)
+{
+ struct pca953x_info *info = dev_get_platdata(dev);
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+ struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
+ char name[32], *str;
+ int addr;
+ ulong driver_data;
+ int ret;
+
+ if (!info) {
+ dev_err(dev, "platdata not ready\n");
+ return -ENOMEM;
+ }
+
+ if (!chip) {
+ dev_err(dev, "i2c not ready\n");
+ return -ENODEV;
+ }
+
+ addr = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "reg", 0);
+ if (addr == 0)
+ return -ENODEV;
+
+ info->addr = addr;
+
+ driver_data = dev_get_driver_data(dev);
+
+ info->gpio_count = driver_data & PCA_GPIO_MASK;
+ if (info->gpio_count > MAX_BANK * BANK_SZ) {
+ dev_err(dev, "Max support %d pins now\n", MAX_BANK * BANK_SZ);
+ return -EINVAL;
+ }
+
+ info->chip_type = PCA_CHIP_TYPE(driver_data);
+ if (info->chip_type != PCA953X_TYPE) {
+ dev_err(dev, "Only support PCA953X chip type now.\n");
+ return -EINVAL;
+ }
+
+ info->bank_count = DIV_ROUND_UP(info->gpio_count, BANK_SZ);
+
+ ret = pca953x_read_regs(dev, PCA953X_OUTPUT, info->reg_output);
+ if (ret) {
+ dev_err(dev, "Error reading output register\n");
+ return ret;
+ }
+
+ ret = pca953x_read_regs(dev, PCA953X_DIRECTION, info->reg_direction);
+ if (ret) {
+ dev_err(dev, "Error reading direction register\n");
+ return ret;
+ }
+
+ snprintf(name, sizeof(name), "gpio@%x_", info->addr);
+ str = strdup(name);
+ if (!str)
+ return -ENOMEM;
+ uc_priv->bank_name = str;
+ uc_priv->gpio_count = info->gpio_count;
+
+ dev_dbg(dev, "%s is ready\n", str);
+
+ return 0;
+}
+
+#define OF_953X(__nrgpio, __int) (ulong)(__nrgpio | PCA953X_TYPE | __int)
+#define OF_957X(__nrgpio, __int) (ulong)(__nrgpio | PCA957X_TYPE | __int)
+
+static const struct udevice_id pca953x_ids[] = {
+ { .compatible = "nxp,pca9505", .data = OF_953X(40, PCA_INT), },
+ { .compatible = "nxp,pca9534", .data = OF_953X(8, PCA_INT), },
+ { .compatible = "nxp,pca9535", .data = OF_953X(16, PCA_INT), },
+ { .compatible = "nxp,pca9536", .data = OF_953X(4, 0), },
+ { .compatible = "nxp,pca9537", .data = OF_953X(4, PCA_INT), },
+ { .compatible = "nxp,pca9538", .data = OF_953X(8, PCA_INT), },
+ { .compatible = "nxp,pca9539", .data = OF_953X(16, PCA_INT), },
+ { .compatible = "nxp,pca9554", .data = OF_953X(8, PCA_INT), },
+ { .compatible = "nxp,pca9555", .data = OF_953X(16, PCA_INT), },
+ { .compatible = "nxp,pca9556", .data = OF_953X(8, 0), },
+ { .compatible = "nxp,pca9557", .data = OF_953X(8, 0), },
+ { .compatible = "nxp,pca9574", .data = OF_957X(8, PCA_INT), },
+ { .compatible = "nxp,pca9575", .data = OF_957X(16, PCA_INT), },
+ { .compatible = "nxp,pca9698", .data = OF_953X(40, 0), },
+
+ { .compatible = "maxim,max7310", .data = OF_953X(8, 0), },
+ { .compatible = "maxim,max7312", .data = OF_953X(16, PCA_INT), },
+ { .compatible = "maxim,max7313", .data = OF_953X(16, PCA_INT), },
+ { .compatible = "maxim,max7315", .data = OF_953X(8, PCA_INT), },
+
+ { .compatible = "ti,pca6107", .data = OF_953X(8, PCA_INT), },
+ { .compatible = "ti,tca6408", .data = OF_953X(8, PCA_INT), },
+ { .compatible = "ti,tca6416", .data = OF_953X(16, PCA_INT), },
+ { .compatible = "ti,tca6424", .data = OF_953X(24, PCA_INT), },
+
+ { .compatible = "onsemi,pca9654", .data = OF_953X(8, PCA_INT), },
+
+ { .compatible = "exar,xra1202", .data = OF_953X(8, 0), },
+ { }
+};
+
+U_BOOT_DRIVER(pca953x) = {
+ .name = "pca953x",
+ .id = UCLASS_GPIO,
+ .ops = &pca953x_ops,
+ .probe = pca953x_probe,
+ .platdata_auto_alloc_size = sizeof(struct pca953x_info),
+ .of_match = pca953x_ids,
+};
projects / u-boot.git / commitdiff