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linux/drivers/mfd/tqmx86.c
Andrew Lunn 2f17dd34ff mfd: tqmx86: IO controller with I2C, Wachdog and GPIO 
The QMX86 is a PLD present on some TQ-Systems ComExpress modules. It
provides 1 or 2 I2C bus masters, 8 GPIOs and a watchdog timer. Add an
MFD which will instantiate the individual drivers.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2019-02-18 09:06:57 +00:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* TQ-Systems PLD MFD core driver, based on vendor driver by
* Vadim V.Vlasov <vvlasov@dev.rtsoft.ru>
*
* Copyright (c) 2015 TQ-Systems GmbH
* Copyright (c) 2019 Andrew Lunn <andrew@lunn.ch>
*/
#include <linux/delay.h>
#include <linux/dmi.h>
#include <linux/i2c.h>
#include <linux/io.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/platform_data/i2c-ocores.h>
#include <linux/platform_device.h>
#define TQMX86_IOBASE 0x160
#define TQMX86_IOSIZE 0x3f
#define TQMX86_IOBASE_I2C 0x1a0
#define TQMX86_IOSIZE_I2C 0xa
#define TQMX86_IOBASE_WATCHDOG 0x18b
#define TQMX86_IOSIZE_WATCHDOG 0x2
#define TQMX86_IOBASE_GPIO 0x18d
#define TQMX86_IOSIZE_GPIO 0x4
#define TQMX86_REG_BOARD_ID 0x20
#define TQMX86_REG_BOARD_ID_E38M 1
#define TQMX86_REG_BOARD_ID_50UC 2
#define TQMX86_REG_BOARD_ID_E38C 3
#define TQMX86_REG_BOARD_ID_60EB 4
#define TQMX86_REG_BOARD_ID_E39M 5
#define TQMX86_REG_BOARD_ID_E39C 6
#define TQMX86_REG_BOARD_ID_E39x 7
#define TQMX86_REG_BOARD_ID_70EB 8
#define TQMX86_REG_BOARD_ID_80UC 9
#define TQMX86_REG_BOARD_ID_90UC 10
#define TQMX86_REG_BOARD_REV 0x21
#define TQMX86_REG_IO_EXT_INT 0x26
#define TQMX86_REG_IO_EXT_INT_NONE 0
#define TQMX86_REG_IO_EXT_INT_7 1
#define TQMX86_REG_IO_EXT_INT_9 2
#define TQMX86_REG_IO_EXT_INT_12 3
#define TQMX86_REG_IO_EXT_INT_MASK 0x3
#define TQMX86_REG_IO_EXT_INT_GPIO_SHIFT 4
#define TQMX86_REG_I2C_DETECT 0x47
#define TQMX86_REG_I2C_DETECT_SOFT 0xa5
#define TQMX86_REG_I2C_INT_EN 0x49
static uint gpio_irq;
module_param(gpio_irq, uint, 0);
MODULE_PARM_DESC(gpio_irq, "GPIO IRQ number (7, 9, 12)");
static const struct resource tqmx_i2c_soft_resources[] = {
DEFINE_RES_IO(TQMX86_IOBASE_I2C, TQMX86_IOSIZE_I2C),
};
static const struct resource tqmx_watchdog_resources[] = {
DEFINE_RES_IO(TQMX86_IOBASE_WATCHDOG, TQMX86_IOSIZE_WATCHDOG),
};
/*
* The IRQ resource must be first, since it is updated with the
* configured IRQ in the probe function.
*/
static struct resource tqmx_gpio_resources[] = {
DEFINE_RES_IRQ(0),
DEFINE_RES_IO(TQMX86_IOBASE_GPIO, TQMX86_IOSIZE_GPIO),
};
static struct i2c_board_info tqmx86_i2c_devices[] = {
{
/* 4K EEPROM at 0x50 */
I2C_BOARD_INFO("24c32", 0x50),
},
};
static struct ocores_i2c_platform_data ocores_platfom_data = {
.num_devices = ARRAY_SIZE(tqmx86_i2c_devices),
.devices = tqmx86_i2c_devices,
};
static const struct mfd_cell tqmx86_i2c_soft_dev[] = {
{
.name = "ocores-i2c",
.platform_data = &ocores_platfom_data,
.pdata_size = sizeof(ocores_platfom_data),
.resources = tqmx_i2c_soft_resources,
.num_resources = ARRAY_SIZE(tqmx_i2c_soft_resources),
},
};
static const struct mfd_cell tqmx86_devs[] = {
{
.name = "tqmx86-wdt",
.resources = tqmx_watchdog_resources,
.num_resources = ARRAY_SIZE(tqmx_watchdog_resources),
.ignore_resource_conflicts = true,
},
{
.name = "tqmx86-gpio",
.resources = tqmx_gpio_resources,
.num_resources = ARRAY_SIZE(tqmx_gpio_resources),
.ignore_resource_conflicts = true,
},
};
static const char *tqmx86_board_id_to_name(u8 board_id)
{
switch (board_id) {
case TQMX86_REG_BOARD_ID_E38M:
return "TQMxE38M";
case TQMX86_REG_BOARD_ID_50UC:
return "TQMx50UC";
case TQMX86_REG_BOARD_ID_E38C:
return "TQMxE38C";
case TQMX86_REG_BOARD_ID_60EB:
return "TQMx60EB";
case TQMX86_REG_BOARD_ID_E39M:
return "TQMxE39M";
case TQMX86_REG_BOARD_ID_E39C:
return "TQMxE39C";
case TQMX86_REG_BOARD_ID_E39x:
return "TQMxE39x";
case TQMX86_REG_BOARD_ID_70EB:
return "TQMx70EB";
case TQMX86_REG_BOARD_ID_80UC:
return "TQMx80UC";
case TQMX86_REG_BOARD_ID_90UC:
return "TQMx90UC";
default:
return "Unknown";
}
}
static int tqmx86_board_id_to_clk_rate(u8 board_id)
{
switch (board_id) {
case TQMX86_REG_BOARD_ID_50UC:
case TQMX86_REG_BOARD_ID_60EB:
case TQMX86_REG_BOARD_ID_70EB:
case TQMX86_REG_BOARD_ID_80UC:
case TQMX86_REG_BOARD_ID_90UC:
return 24000;
case TQMX86_REG_BOARD_ID_E39M:
case TQMX86_REG_BOARD_ID_E39C:
case TQMX86_REG_BOARD_ID_E39x:
return 25000;
case TQMX86_REG_BOARD_ID_E38M:
case TQMX86_REG_BOARD_ID_E38C:
return 33000;
default:
return 0;
}
}
static int tqmx86_probe(struct platform_device *pdev)
{
u8 board_id, rev, i2c_det, i2c_ien, io_ext_int_val;
struct device *dev = &pdev->dev;
u8 gpio_irq_cfg, readback;
const char *board_name;
void __iomem *io_base;
int err;
switch (gpio_irq) {
case 0:
gpio_irq_cfg = TQMX86_REG_IO_EXT_INT_NONE;
break;
case 7:
gpio_irq_cfg = TQMX86_REG_IO_EXT_INT_7;
break;
case 9:
gpio_irq_cfg = TQMX86_REG_IO_EXT_INT_9;
break;
case 12:
gpio_irq_cfg = TQMX86_REG_IO_EXT_INT_12;
break;
default:
pr_err("tqmx86: Invalid GPIO IRQ (%d)\n", gpio_irq);
return -EINVAL;
}
io_base = devm_ioport_map(dev, TQMX86_IOBASE, TQMX86_IOSIZE);
if (!io_base)
return -ENOMEM;
board_id = ioread8(io_base + TQMX86_REG_BOARD_ID);
board_name = tqmx86_board_id_to_name(board_id);
rev = ioread8(io_base + TQMX86_REG_BOARD_REV);
dev_info(dev,
"Found %s - Board ID %d, PCB Revision %d, PLD Revision %d\n",
board_name, board_id, rev >> 4, rev & 0xf);
i2c_det = ioread8(io_base + TQMX86_REG_I2C_DETECT);
i2c_ien = ioread8(io_base + TQMX86_REG_I2C_INT_EN);
if (gpio_irq_cfg) {
io_ext_int_val =
gpio_irq_cfg << TQMX86_REG_IO_EXT_INT_GPIO_SHIFT;
iowrite8(io_ext_int_val, io_base + TQMX86_REG_IO_EXT_INT);
readback = ioread8(io_base + TQMX86_REG_IO_EXT_INT);
if (readback != io_ext_int_val) {
dev_warn(dev, "GPIO interrupts not supported.\n");
return -EINVAL;
}
/* Assumes the IRQ resource is first. */
tqmx_gpio_resources[0].start = gpio_irq;
}
ocores_platfom_data.clock_khz = tqmx86_board_id_to_clk_rate(board_id);
if (i2c_det == TQMX86_REG_I2C_DETECT_SOFT) {
err = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
tqmx86_i2c_soft_dev,
ARRAY_SIZE(tqmx86_i2c_soft_dev),
NULL, 0, NULL);
if (err)
return err;
}
return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
tqmx86_devs,
ARRAY_SIZE(tqmx86_devs),
NULL, 0, NULL);
}
static int tqmx86_create_platform_device(const struct dmi_system_id *id)
{
struct platform_device *pdev;
int err;
pdev = platform_device_alloc("tqmx86", -1);
if (!pdev)
return -ENOMEM;
err = platform_device_add(pdev);
if (err)
platform_device_put(pdev);
return err;
}
static const struct dmi_system_id tqmx86_dmi_table[] __initconst = {
{
.ident = "TQMX86",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "TQ-Group"),
DMI_MATCH(DMI_PRODUCT_NAME, "TQMx"),
},
.callback = tqmx86_create_platform_device,
},
{}
};
MODULE_DEVICE_TABLE(dmi, tqmx86_dmi_table);
static struct platform_driver tqmx86_driver = {
.driver = {
.name = "tqmx86",
},
.probe = tqmx86_probe,
};
static int __init tqmx86_init(void)
{
if (!dmi_check_system(tqmx86_dmi_table))
return -ENODEV;
return platform_driver_register(&tqmx86_driver);
}
module_init(tqmx86_init);
MODULE_DESCRIPTION("TQx86 PLD Core Driver");
MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:tqmx86");
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