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serial: max310x: Add MAX14830 support 

This patch adds support for MAX14830 (advanced quad universal asynchronous
receiver-transmitter) into max310x driver.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Alexander Shiyan 2013-06-29 10:44:19 +04:00 committed by Greg Kroah-Hartman
parent 21fc509f11
commit 003236d9ac
3 changed files with 47 additions and 4 deletions
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2
drivers/tty/serial/Kconfig
View File

@ -297,7 +297,7 @@ config SERIAL_MAX310X
default n
help
This selects support for an advanced UART from Maxim (Dallas).
Supported ICs are MAX3107, MAX3108, MAX3109.
Supported ICs are MAX3107, MAX3108, MAX3109, MAX14830.
Each IC contains 128 words each of receive and transmit FIFO
that can be controlled through I2C or high-speed SPI.

45
drivers/tty/serial/max310x.c
View File

@ -1,5 +1,5 @@
/*
* Maxim (Dallas) MAX3107/8/9 serial driver
* Maxim (Dallas) MAX3107/8/9, MAX14830 serial driver
*
* Copyright (C) 2012-2013 Alexander Shiyan <shc_work@mail.ru>
*
@ -269,6 +269,10 @@
/* MAX3109 specific */
#define MAX3109_REV_ID (0xc0)
/* MAX14830 specific */
#define MAX14830_BRGCFG_CLKDIS_BIT (1 << 6) /* Clock Disable */
#define MAX14830_REV_ID (0xb0)
struct max310x_devtype {
char name[9];
int nr;
@ -387,6 +391,37 @@ static void max310x_power(struct uart_port *port, int on)
msleep(50);
}
static int max14830_detect(struct device *dev)
{
struct max310x_port *s = dev_get_drvdata(dev);
unsigned int val = 0;
int ret;
ret = regmap_write(s->regmap, MAX310X_GLOBALCMD_REG,
MAX310X_EXTREG_ENBL);
if (ret)
return ret;
regmap_read(s->regmap, MAX310X_REVID_EXTREG, &val);
regmap_write(s->regmap, MAX310X_GLOBALCMD_REG, MAX310X_EXTREG_DSBL);
if (((val & MAX310x_REV_MASK) != MAX14830_REV_ID)) {
dev_err(dev,
"%s ID 0x%02x does not match\n", s->devtype->name, val);
return -ENODEV;
}
return 0;
}
static void max14830_power(struct uart_port *port, int on)
{
max310x_port_update(port, MAX310X_BRGCFG_REG,
MAX14830_BRGCFG_CLKDIS_BIT,
on ? 0 : MAX14830_BRGCFG_CLKDIS_BIT);
if (on)
msleep(50);
}
static const struct max310x_devtype max3107_devtype = {
.name = "MAX3107",
.nr = 1,
@ -408,6 +443,13 @@ static const struct max310x_devtype max3109_devtype = {
.power = max310x_power,
};
static const struct max310x_devtype max14830_devtype = {
.name = "MAX14830",
.nr = 4,
.detect = max14830_detect,
.power = max14830_power,
};
static bool max310x_reg_writeable(struct device *dev, unsigned int reg)
{
switch (reg & 0x1f) {
@ -1253,6 +1295,7 @@ static const struct spi_device_id max310x_id_table[] = {
{ "max3107", (kernel_ulong_t)&max3107_devtype, },
{ "max3108", (kernel_ulong_t)&max3108_devtype, },
{ "max3109", (kernel_ulong_t)&max3109_devtype, },
{ "max14830", (kernel_ulong_t)&max14830_devtype, },
{ }
};
MODULE_DEVICE_TABLE(spi, max310x_id_table);

4
include/linux/platform_data/max310x.h
View File

@ -1,5 +1,5 @@
/*
* Maxim (Dallas) MAX3107/8/9 serial driver
* Maxim (Dallas) MAX3107/8/9, MAX14830 serial driver
*
* Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru>
*
@ -37,7 +37,7 @@
* };
*/
#define MAX310X_MAX_UARTS 2
#define MAX310X_MAX_UARTS 4
/* MAX310X platform data structure */
struct max310x_pdata {