265 lines
6.6 KiB
C
265 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2017
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* Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
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*/
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#include <common.h>
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#include <dm.h>
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#include <board.h>
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#include <i2c.h>
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#include <asm/gpio.h>
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#include "gazerbeam.h"
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/* Sequence number of I2C bus that holds the GPIO expanders */
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static const int I2C_BUS_SEQ_NO = 1;
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/* I2C address of SC/MC2 expander */
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static const int MC2_EXPANDER_ADDR = 0x20;
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/* I2C address of MC4 expander */
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static const int MC4_EXPANDER_ADDR = 0x22;
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/* Number of the GPIO to read the SC data from */
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static const int SC_GPIO_NO;
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/* Number of the GPIO to read the CON data from */
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static const int CON_GPIO_NO = 1;
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/**
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* struct board_gazerbeam_priv - Private data structure for the gazerbeam board
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* driver.
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* @reset_gpios: GPIOs for the board's reset GPIOs.
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* @var_gpios: GPIOs for the board's hardware variant GPIOs
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* @ver_gpios: GPIOs for the board's hardware version GPIOs
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* @variant: Container for the board's hardware variant (CON/CPU)
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* @multichannel: Container for the board's multichannel variant (MC4/MC2/SC)
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* @hwversion: Container for the board's hardware version
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*/
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struct board_gazerbeam_priv {
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struct gpio_desc reset_gpios[2];
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struct gpio_desc var_gpios[2];
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struct gpio_desc ver_gpios[4];
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int variant;
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int multichannel;
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int hwversion;
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};
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/**
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* _read_board_variant_data() - Read variant information from the hardware.
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* @dev: The board device for which to determine the multichannel and device
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* type information.
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*
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* The data read from the board's hardware (mostly hard-wired GPIOs) is stored
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* in the private data structure of the driver to be used by other driver
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* methods.
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*
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* Return: 0 if OK, -ve on error.
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*/
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static int _read_board_variant_data(struct udevice *dev)
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{
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struct board_gazerbeam_priv *priv = dev_get_priv(dev);
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struct udevice *i2c_bus;
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struct udevice *dummy;
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char *listname;
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int mc4, mc2, sc, mc2_sc, con;
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int gpio_num;
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int res;
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res = uclass_get_device_by_seq(UCLASS_I2C, I2C_BUS_SEQ_NO, &i2c_bus);
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if (res) {
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debug("%s: Could not get I2C bus %d (err = %d)\n",
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dev->name, I2C_BUS_SEQ_NO, res);
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return res;
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}
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if (!i2c_bus) {
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debug("%s: Could not get I2C bus %d\n",
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dev->name, I2C_BUS_SEQ_NO);
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return -EIO;
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}
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mc2_sc = !dm_i2c_probe(i2c_bus, MC2_EXPANDER_ADDR, 0, &dummy);
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mc4 = !dm_i2c_probe(i2c_bus, MC4_EXPANDER_ADDR, 0, &dummy);
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if (mc2_sc && mc4) {
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debug("%s: Board hardware configuration inconsistent.\n",
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dev->name);
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return -EINVAL;
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}
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listname = mc2_sc ? "var-gpios-mc2" : "var-gpios-mc4";
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gpio_num = gpio_request_list_by_name(dev, listname, priv->var_gpios,
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ARRAY_SIZE(priv->var_gpios),
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GPIOD_IS_IN);
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if (gpio_num < 0) {
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debug("%s: Requesting gpio list %s failed (err = %d).\n",
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dev->name, listname, gpio_num);
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return gpio_num;
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}
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sc = dm_gpio_get_value(&priv->var_gpios[SC_GPIO_NO]);
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if (sc < 0) {
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debug("%s: Error while reading 'sc' GPIO (err = %d)",
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dev->name, sc);
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return sc;
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}
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mc2 = mc2_sc ? (sc ? 0 : 1) : 0;
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if ((sc && mc2) || (sc && mc4) || (!sc && !mc2 && !mc4)) {
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debug("%s: Board hardware configuration inconsistent.\n",
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dev->name);
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return -EINVAL;
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}
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con = dm_gpio_get_value(&priv->var_gpios[CON_GPIO_NO]);
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if (con < 0) {
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debug("%s: Error while reading 'con' GPIO (err = %d)",
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dev->name, con);
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return con;
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}
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priv->variant = con ? VAR_CON : VAR_CPU;
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priv->multichannel = mc4 ? 4 : (mc2 ? 2 : (sc ? 1 : 0));
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return 0;
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}
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/**
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* _read_hwversion() - Read the hardware version from the board.
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* @dev: The board device for which to read the hardware version.
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*
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* The hardware version read from the board (from hard-wired GPIOs) is stored
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* in the private data structure of the driver to be used by other driver
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* methods.
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*
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* Return: 0 if OK, -ve on error.
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*/
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static int _read_hwversion(struct udevice *dev)
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{
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struct board_gazerbeam_priv *priv = dev_get_priv(dev);
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int res;
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res = gpio_request_list_by_name(dev, "ver-gpios", priv->ver_gpios,
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ARRAY_SIZE(priv->ver_gpios),
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GPIOD_IS_IN);
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if (res < 0) {
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debug("%s: Error getting GPIO list 'ver-gpios' (err = %d)\n",
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dev->name, res);
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return -ENODEV;
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}
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res = dm_gpio_get_values_as_int(priv->ver_gpios,
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ARRAY_SIZE(priv->ver_gpios));
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if (res < 0) {
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debug("%s: Error reading HW version from expander (err = %d)\n",
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dev->name, res);
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return res;
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}
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priv->hwversion = res;
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res = gpio_free_list(dev, priv->ver_gpios, ARRAY_SIZE(priv->ver_gpios));
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if (res < 0) {
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debug("%s: Error freeing HW version GPIO list (err = %d)\n",
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dev->name, res);
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return res;
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}
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return 0;
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}
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static int board_gazerbeam_detect(struct udevice *dev)
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{
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int res;
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res = _read_board_variant_data(dev);
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if (res) {
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debug("%s: Error reading multichannel variant (err = %d)\n",
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dev->name, res);
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return res;
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}
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res = _read_hwversion(dev);
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if (res) {
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debug("%s: Error reading hardware version (err = %d)\n",
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dev->name, res);
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return res;
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}
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return 0;
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}
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static int board_gazerbeam_get_int(struct udevice *dev, int id, int *val)
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{
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struct board_gazerbeam_priv *priv = dev_get_priv(dev);
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switch (id) {
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case BOARD_MULTICHANNEL:
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*val = priv->multichannel;
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break;
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case BOARD_VARIANT:
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*val = priv->variant;
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break;
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case BOARD_HWVERSION:
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*val = priv->hwversion;
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break;
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default:
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debug("%s: Integer value %d unknown\n", dev->name, id);
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return -EINVAL;
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}
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return 0;
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}
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static const struct udevice_id board_gazerbeam_ids[] = {
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{ .compatible = "gdsys,board_gazerbeam" },
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{ /* sentinel */ }
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};
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static const struct board_ops board_gazerbeam_ops = {
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.detect = board_gazerbeam_detect,
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.get_int = board_gazerbeam_get_int,
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};
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static int board_gazerbeam_probe(struct udevice *dev)
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{
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struct board_gazerbeam_priv *priv = dev_get_priv(dev);
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int gpio_num, i;
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gpio_num = gpio_request_list_by_name(dev, "reset-gpios",
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priv->reset_gpios,
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ARRAY_SIZE(priv->reset_gpios),
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GPIOD_IS_OUT);
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if (gpio_num < 0) {
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debug("%s: Error getting GPIO list 'reset-gpios' (err = %d)\n",
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dev->name, gpio_num);
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return gpio_num;
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}
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/* Set startup-finished GPIOs */
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for (i = 0; i < ARRAY_SIZE(priv->reset_gpios); i++) {
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int res = dm_gpio_set_value(&priv->reset_gpios[i], 0);
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if (res) {
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debug("%s: Error while setting GPIO %d (err = %d)\n",
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dev->name, i, res);
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return res;
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}
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}
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return 0;
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}
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U_BOOT_DRIVER(board_gazerbeam) = {
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.name = "board_gazerbeam",
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.id = UCLASS_BOARD,
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.of_match = board_gazerbeam_ids,
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.ops = &board_gazerbeam_ops,
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.priv_auto_alloc_size = sizeof(struct board_gazerbeam_priv),
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.probe = board_gazerbeam_probe,
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};
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