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https://github.com/brain-hackers/u-boot-brain
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![Simon Glass](/assets/img/avatar_default.png)
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
266 lines
6.6 KiB
C
266 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 <sysinfo.h>
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#include <i2c.h>
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#include <log.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 sysinfo_gazerbeam_priv - Private data structure for the gazerbeam
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* sysinfo driver
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* @reset_gpios: GPIOs for the sysinfo's reset GPIOs.
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* @var_gpios: GPIOs for the sysinfo's hardware variant GPIOs
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* @ver_gpios: GPIOs for the sysinfo's hardware version GPIOs
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* @variant: Container for the sysinfo's hardware variant (CON/CPU)
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* @multichannel: Container for the sysinfo's multichannel variant (MC4/MC2/SC)
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* @hwversion: Container for the sysinfo's hardware version
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*/
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struct sysinfo_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_sysinfo_variant_data() - Read variant information from the hardware.
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* @dev: The sysinfo 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 sysinfo'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_sysinfo_variant_data(struct udevice *dev)
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{
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struct sysinfo_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 sysinfo.
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* @dev: The sysinfo device for which to read the hardware version.
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*
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* The hardware version read from the sysinfo (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 sysinfo_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 sysinfo_gazerbeam_detect(struct udevice *dev)
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{
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int res;
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res = _read_sysinfo_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 sysinfo_gazerbeam_get_int(struct udevice *dev, int id, int *val)
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{
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struct sysinfo_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 sysinfo_gazerbeam_ids[] = {
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{ .compatible = "gdsys,sysinfo-gazerbeam" },
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{ /* sentinel */ }
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};
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static const struct sysinfo_ops sysinfo_gazerbeam_ops = {
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.detect = sysinfo_gazerbeam_detect,
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.get_int = sysinfo_gazerbeam_get_int,
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};
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static int sysinfo_gazerbeam_probe(struct udevice *dev)
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{
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struct sysinfo_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(sysinfo_gazerbeam) = {
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.name = "sysinfo_gazerbeam",
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.id = UCLASS_SYSINFO,
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.of_match = sysinfo_gazerbeam_ids,
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.ops = &sysinfo_gazerbeam_ops,
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.priv_auto = sizeof(struct sysinfo_gazerbeam_priv),
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.probe = sysinfo_gazerbeam_probe,
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};
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