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f376c47966
It seems that this driver was developed based on preliminary documentation.
Report the correct names for all TQMxE39x variants, as they are used by
the released hardware revisions:
- Fix names for TQMxE39C1/C2 board IDs
- Distinguish TQMxE39M and TQMxE39S, which use the same board ID
The TQMxE39M/S are distinguished using the SAUC (Sanctioned Alternate
Uses Configuration) register of the GPIO controller. This also prepares
for the correct handling of the differences between the GPIO controllers
of our COMe and SMARC modules.
Fixes: 2f17dd34ff ("mfd: tqmx86: IO controller with I2C, Wachdog and GPIO")
Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/aca9a7cb42a85181bcb456c437554d2728e708ec.1676892223.git.matthias.schiffer@ew.tq-group.com
315 lines
7.9 KiB
C
315 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* TQ-Systems PLD MFD core driver, based on vendor driver by
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* Vadim V.Vlasov <vvlasov@dev.rtsoft.ru>
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*
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* Copyright (c) 2015 TQ-Systems GmbH
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* Copyright (c) 2019 Andrew Lunn <andrew@lunn.ch>
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*/
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#include <linux/delay.h>
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#include <linux/dmi.h>
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#include <linux/i2c.h>
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#include <linux/io.h>
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#include <linux/mfd/core.h>
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#include <linux/module.h>
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#include <linux/platform_data/i2c-ocores.h>
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#include <linux/platform_device.h>
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#define TQMX86_IOBASE 0x180
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#define TQMX86_IOSIZE 0x20
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#define TQMX86_IOBASE_I2C 0x1a0
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#define TQMX86_IOSIZE_I2C 0xa
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#define TQMX86_IOBASE_WATCHDOG 0x18b
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#define TQMX86_IOSIZE_WATCHDOG 0x2
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#define TQMX86_IOBASE_GPIO 0x18d
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#define TQMX86_IOSIZE_GPIO 0x4
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#define TQMX86_REG_BOARD_ID 0x00
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#define TQMX86_REG_BOARD_ID_E38M 1
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#define TQMX86_REG_BOARD_ID_50UC 2
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#define TQMX86_REG_BOARD_ID_E38C 3
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#define TQMX86_REG_BOARD_ID_60EB 4
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#define TQMX86_REG_BOARD_ID_E39MS 5
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#define TQMX86_REG_BOARD_ID_E39C1 6
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#define TQMX86_REG_BOARD_ID_E39C2 7
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#define TQMX86_REG_BOARD_ID_70EB 8
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#define TQMX86_REG_BOARD_ID_80UC 9
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#define TQMX86_REG_BOARD_ID_110EB 11
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#define TQMX86_REG_BOARD_ID_E40M 12
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#define TQMX86_REG_BOARD_ID_E40S 13
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#define TQMX86_REG_BOARD_ID_E40C1 14
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#define TQMX86_REG_BOARD_ID_E40C2 15
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#define TQMX86_REG_BOARD_REV 0x01
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#define TQMX86_REG_IO_EXT_INT 0x06
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#define TQMX86_REG_IO_EXT_INT_NONE 0
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#define TQMX86_REG_IO_EXT_INT_7 1
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#define TQMX86_REG_IO_EXT_INT_9 2
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#define TQMX86_REG_IO_EXT_INT_12 3
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#define TQMX86_REG_IO_EXT_INT_MASK 0x3
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#define TQMX86_REG_IO_EXT_INT_GPIO_SHIFT 4
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#define TQMX86_REG_SAUC 0x17
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#define TQMX86_REG_I2C_DETECT 0x1a7
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#define TQMX86_REG_I2C_DETECT_SOFT 0xa5
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static uint gpio_irq;
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module_param(gpio_irq, uint, 0);
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MODULE_PARM_DESC(gpio_irq, "GPIO IRQ number (7, 9, 12)");
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static const struct resource tqmx_i2c_soft_resources[] = {
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DEFINE_RES_IO(TQMX86_IOBASE_I2C, TQMX86_IOSIZE_I2C),
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};
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static const struct resource tqmx_watchdog_resources[] = {
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DEFINE_RES_IO(TQMX86_IOBASE_WATCHDOG, TQMX86_IOSIZE_WATCHDOG),
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};
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/*
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* The IRQ resource must be first, since it is updated with the
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* configured IRQ in the probe function.
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*/
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static struct resource tqmx_gpio_resources[] = {
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DEFINE_RES_IRQ(0),
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DEFINE_RES_IO(TQMX86_IOBASE_GPIO, TQMX86_IOSIZE_GPIO),
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};
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static struct i2c_board_info tqmx86_i2c_devices[] = {
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{
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/* 4K EEPROM at 0x50 */
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I2C_BOARD_INFO("24c32", 0x50),
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},
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};
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static struct ocores_i2c_platform_data ocores_platform_data = {
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.num_devices = ARRAY_SIZE(tqmx86_i2c_devices),
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.devices = tqmx86_i2c_devices,
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};
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static const struct mfd_cell tqmx86_i2c_soft_dev[] = {
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{
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.name = "ocores-i2c",
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.platform_data = &ocores_platform_data,
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.pdata_size = sizeof(ocores_platform_data),
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.resources = tqmx_i2c_soft_resources,
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.num_resources = ARRAY_SIZE(tqmx_i2c_soft_resources),
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},
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};
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static const struct mfd_cell tqmx86_devs[] = {
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{
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.name = "tqmx86-wdt",
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.resources = tqmx_watchdog_resources,
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.num_resources = ARRAY_SIZE(tqmx_watchdog_resources),
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.ignore_resource_conflicts = true,
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},
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{
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.name = "tqmx86-gpio",
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.resources = tqmx_gpio_resources,
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.num_resources = ARRAY_SIZE(tqmx_gpio_resources),
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.ignore_resource_conflicts = true,
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},
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};
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static const char *tqmx86_board_id_to_name(u8 board_id, u8 sauc)
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{
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switch (board_id) {
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case TQMX86_REG_BOARD_ID_E38M:
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return "TQMxE38M";
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case TQMX86_REG_BOARD_ID_50UC:
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return "TQMx50UC";
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case TQMX86_REG_BOARD_ID_E38C:
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return "TQMxE38C";
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case TQMX86_REG_BOARD_ID_60EB:
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return "TQMx60EB";
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case TQMX86_REG_BOARD_ID_E39MS:
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return (sauc == 0xff) ? "TQMxE39M" : "TQMxE39S";
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case TQMX86_REG_BOARD_ID_E39C1:
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return "TQMxE39C1";
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case TQMX86_REG_BOARD_ID_E39C2:
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return "TQMxE39C2";
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case TQMX86_REG_BOARD_ID_70EB:
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return "TQMx70EB";
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case TQMX86_REG_BOARD_ID_80UC:
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return "TQMx80UC";
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case TQMX86_REG_BOARD_ID_110EB:
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return "TQMx110EB";
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case TQMX86_REG_BOARD_ID_E40M:
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return "TQMxE40M";
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case TQMX86_REG_BOARD_ID_E40S:
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return "TQMxE40S";
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case TQMX86_REG_BOARD_ID_E40C1:
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return "TQMxE40C1";
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case TQMX86_REG_BOARD_ID_E40C2:
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return "TQMxE40C2";
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default:
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return "Unknown";
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}
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}
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static int tqmx86_board_id_to_clk_rate(struct device *dev, u8 board_id)
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{
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switch (board_id) {
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case TQMX86_REG_BOARD_ID_50UC:
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case TQMX86_REG_BOARD_ID_60EB:
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case TQMX86_REG_BOARD_ID_70EB:
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case TQMX86_REG_BOARD_ID_80UC:
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case TQMX86_REG_BOARD_ID_110EB:
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case TQMX86_REG_BOARD_ID_E40M:
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case TQMX86_REG_BOARD_ID_E40S:
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case TQMX86_REG_BOARD_ID_E40C1:
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case TQMX86_REG_BOARD_ID_E40C2:
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return 24000;
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case TQMX86_REG_BOARD_ID_E39MS:
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case TQMX86_REG_BOARD_ID_E39C1:
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case TQMX86_REG_BOARD_ID_E39C2:
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return 25000;
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case TQMX86_REG_BOARD_ID_E38M:
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case TQMX86_REG_BOARD_ID_E38C:
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return 33000;
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default:
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dev_warn(dev, "unknown board %d, assuming 24MHz LPC clock\n",
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board_id);
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return 24000;
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}
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}
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static int tqmx86_probe(struct platform_device *pdev)
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{
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u8 board_id, sauc, rev, i2c_det, io_ext_int_val;
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struct device *dev = &pdev->dev;
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u8 gpio_irq_cfg, readback;
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const char *board_name;
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void __iomem *io_base;
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int err;
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switch (gpio_irq) {
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case 0:
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gpio_irq_cfg = TQMX86_REG_IO_EXT_INT_NONE;
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break;
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case 7:
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gpio_irq_cfg = TQMX86_REG_IO_EXT_INT_7;
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break;
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case 9:
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gpio_irq_cfg = TQMX86_REG_IO_EXT_INT_9;
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break;
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case 12:
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gpio_irq_cfg = TQMX86_REG_IO_EXT_INT_12;
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break;
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default:
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pr_err("tqmx86: Invalid GPIO IRQ (%d)\n", gpio_irq);
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return -EINVAL;
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}
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io_base = devm_ioport_map(dev, TQMX86_IOBASE, TQMX86_IOSIZE);
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if (!io_base)
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return -ENOMEM;
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board_id = ioread8(io_base + TQMX86_REG_BOARD_ID);
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sauc = ioread8(io_base + TQMX86_REG_SAUC);
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board_name = tqmx86_board_id_to_name(board_id, sauc);
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rev = ioread8(io_base + TQMX86_REG_BOARD_REV);
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dev_info(dev,
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"Found %s - Board ID %d, PCB Revision %d, PLD Revision %d\n",
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board_name, board_id, rev >> 4, rev & 0xf);
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/*
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* The I2C_DETECT register is in the range assigned to the I2C driver
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* later, so we don't extend TQMX86_IOSIZE. Use inb() for this one-off
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* access instead of ioport_map + unmap.
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*/
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i2c_det = inb(TQMX86_REG_I2C_DETECT);
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if (gpio_irq_cfg) {
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io_ext_int_val =
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gpio_irq_cfg << TQMX86_REG_IO_EXT_INT_GPIO_SHIFT;
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iowrite8(io_ext_int_val, io_base + TQMX86_REG_IO_EXT_INT);
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readback = ioread8(io_base + TQMX86_REG_IO_EXT_INT);
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if (readback != io_ext_int_val) {
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dev_warn(dev, "GPIO interrupts not supported.\n");
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return -EINVAL;
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}
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/* Assumes the IRQ resource is first. */
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tqmx_gpio_resources[0].start = gpio_irq;
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} else {
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tqmx_gpio_resources[0].flags = 0;
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}
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ocores_platform_data.clock_khz = tqmx86_board_id_to_clk_rate(dev, board_id);
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if (i2c_det == TQMX86_REG_I2C_DETECT_SOFT) {
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err = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
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tqmx86_i2c_soft_dev,
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ARRAY_SIZE(tqmx86_i2c_soft_dev),
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NULL, 0, NULL);
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if (err)
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return err;
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}
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return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
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tqmx86_devs,
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ARRAY_SIZE(tqmx86_devs),
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NULL, 0, NULL);
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}
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static int tqmx86_create_platform_device(const struct dmi_system_id *id)
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{
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struct platform_device *pdev;
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int err;
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pdev = platform_device_alloc("tqmx86", -1);
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if (!pdev)
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return -ENOMEM;
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err = platform_device_add(pdev);
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if (err)
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platform_device_put(pdev);
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return err;
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}
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static const struct dmi_system_id tqmx86_dmi_table[] __initconst = {
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{
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.ident = "TQMX86",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "TQ-Group"),
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DMI_MATCH(DMI_PRODUCT_NAME, "TQMx"),
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},
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.callback = tqmx86_create_platform_device,
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},
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{
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.ident = "TQMX86",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "TQ-Systems"),
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DMI_MATCH(DMI_PRODUCT_NAME, "TQMx"),
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},
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.callback = tqmx86_create_platform_device,
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},
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{}
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};
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MODULE_DEVICE_TABLE(dmi, tqmx86_dmi_table);
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static struct platform_driver tqmx86_driver = {
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.driver = {
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.name = "tqmx86",
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},
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.probe = tqmx86_probe,
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};
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static int __init tqmx86_init(void)
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{
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if (!dmi_check_system(tqmx86_dmi_table))
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return -ENODEV;
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return platform_driver_register(&tqmx86_driver);
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}
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module_init(tqmx86_init);
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MODULE_DESCRIPTION("TQMx86 PLD Core Driver");
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MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:tqmx86");
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