mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 08:44:21 +08:00
2f17dd34ff
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>
282 lines
6.9 KiB
C
282 lines
6.9 KiB
C
// 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");
|