465 lines
11 KiB
C
465 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Probe for F81216A LPC to 4 UART
|
|
*
|
|
* Copyright (C) 2014-2016 Ricardo Ribalda, Qtechnology A/S
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/pnp.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/serial_core.h>
|
|
#include <linux/irq.h>
|
|
#include "8250.h"
|
|
|
|
#define ADDR_PORT 0
|
|
#define DATA_PORT 1
|
|
#define EXIT_KEY 0xAA
|
|
#define CHIP_ID1 0x20
|
|
#define CHIP_ID2 0x21
|
|
#define CHIP_ID_F81865 0x0407
|
|
#define CHIP_ID_F81866 0x1010
|
|
#define CHIP_ID_F81966 0x0215
|
|
#define CHIP_ID_F81216AD 0x1602
|
|
#define CHIP_ID_F81216H 0x0501
|
|
#define CHIP_ID_F81216 0x0802
|
|
#define VENDOR_ID1 0x23
|
|
#define VENDOR_ID1_VAL 0x19
|
|
#define VENDOR_ID2 0x24
|
|
#define VENDOR_ID2_VAL 0x34
|
|
#define IO_ADDR1 0x61
|
|
#define IO_ADDR2 0x60
|
|
#define LDN 0x7
|
|
|
|
#define FINTEK_IRQ_MODE 0x70
|
|
#define IRQ_SHARE BIT(4)
|
|
#define IRQ_MODE_MASK (BIT(6) | BIT(5))
|
|
#define IRQ_LEVEL_LOW 0
|
|
#define IRQ_EDGE_HIGH BIT(5)
|
|
|
|
/*
|
|
* F81216H clock source register, the value and mask is the same with F81866,
|
|
* but it's on F0h.
|
|
*
|
|
* Clock speeds for UART (register F0h)
|
|
* 00: 1.8432MHz.
|
|
* 01: 18.432MHz.
|
|
* 10: 24MHz.
|
|
* 11: 14.769MHz.
|
|
*/
|
|
#define RS485 0xF0
|
|
#define RTS_INVERT BIT(5)
|
|
#define RS485_URA BIT(4)
|
|
#define RXW4C_IRA BIT(3)
|
|
#define TXW4C_IRA BIT(2)
|
|
|
|
#define FIFO_CTRL 0xF6
|
|
#define FIFO_MODE_MASK (BIT(1) | BIT(0))
|
|
#define FIFO_MODE_128 (BIT(1) | BIT(0))
|
|
#define RXFTHR_MODE_MASK (BIT(5) | BIT(4))
|
|
#define RXFTHR_MODE_4X BIT(5)
|
|
|
|
#define F81216_LDN_LOW 0x0
|
|
#define F81216_LDN_HIGH 0x4
|
|
|
|
/*
|
|
* F81866/966 registers
|
|
*
|
|
* The IRQ setting mode of F81866/966 is not the same with F81216 series.
|
|
* Level/Low: IRQ_MODE0:0, IRQ_MODE1:0
|
|
* Edge/High: IRQ_MODE0:1, IRQ_MODE1:0
|
|
*
|
|
* Clock speeds for UART (register F2h)
|
|
* 00: 1.8432MHz.
|
|
* 01: 18.432MHz.
|
|
* 10: 24MHz.
|
|
* 11: 14.769MHz.
|
|
*/
|
|
#define F81866_IRQ_MODE 0xf0
|
|
#define F81866_IRQ_SHARE BIT(0)
|
|
#define F81866_IRQ_MODE0 BIT(1)
|
|
|
|
#define F81866_FIFO_CTRL FIFO_CTRL
|
|
#define F81866_IRQ_MODE1 BIT(3)
|
|
|
|
#define F81866_LDN_LOW 0x10
|
|
#define F81866_LDN_HIGH 0x16
|
|
|
|
#define F81866_UART_CLK 0xF2
|
|
#define F81866_UART_CLK_MASK (BIT(1) | BIT(0))
|
|
#define F81866_UART_CLK_1_8432MHZ 0
|
|
#define F81866_UART_CLK_14_769MHZ (BIT(1) | BIT(0))
|
|
#define F81866_UART_CLK_18_432MHZ BIT(0)
|
|
#define F81866_UART_CLK_24MHZ BIT(1)
|
|
|
|
struct fintek_8250 {
|
|
u16 pid;
|
|
u16 base_port;
|
|
u8 index;
|
|
u8 key;
|
|
};
|
|
|
|
static u8 sio_read_reg(struct fintek_8250 *pdata, u8 reg)
|
|
{
|
|
outb(reg, pdata->base_port + ADDR_PORT);
|
|
return inb(pdata->base_port + DATA_PORT);
|
|
}
|
|
|
|
static void sio_write_reg(struct fintek_8250 *pdata, u8 reg, u8 data)
|
|
{
|
|
outb(reg, pdata->base_port + ADDR_PORT);
|
|
outb(data, pdata->base_port + DATA_PORT);
|
|
}
|
|
|
|
static void sio_write_mask_reg(struct fintek_8250 *pdata, u8 reg, u8 mask,
|
|
u8 data)
|
|
{
|
|
u8 tmp;
|
|
|
|
tmp = (sio_read_reg(pdata, reg) & ~mask) | (mask & data);
|
|
sio_write_reg(pdata, reg, tmp);
|
|
}
|
|
|
|
static int fintek_8250_enter_key(u16 base_port, u8 key)
|
|
{
|
|
if (!request_muxed_region(base_port, 2, "8250_fintek"))
|
|
return -EBUSY;
|
|
|
|
/* Force to deactive all SuperIO in this base_port */
|
|
outb(EXIT_KEY, base_port + ADDR_PORT);
|
|
|
|
outb(key, base_port + ADDR_PORT);
|
|
outb(key, base_port + ADDR_PORT);
|
|
return 0;
|
|
}
|
|
|
|
static void fintek_8250_exit_key(u16 base_port)
|
|
{
|
|
|
|
outb(EXIT_KEY, base_port + ADDR_PORT);
|
|
release_region(base_port + ADDR_PORT, 2);
|
|
}
|
|
|
|
static int fintek_8250_check_id(struct fintek_8250 *pdata)
|
|
{
|
|
u16 chip;
|
|
|
|
if (sio_read_reg(pdata, VENDOR_ID1) != VENDOR_ID1_VAL)
|
|
return -ENODEV;
|
|
|
|
if (sio_read_reg(pdata, VENDOR_ID2) != VENDOR_ID2_VAL)
|
|
return -ENODEV;
|
|
|
|
chip = sio_read_reg(pdata, CHIP_ID1);
|
|
chip |= sio_read_reg(pdata, CHIP_ID2) << 8;
|
|
|
|
switch (chip) {
|
|
case CHIP_ID_F81865:
|
|
case CHIP_ID_F81866:
|
|
case CHIP_ID_F81966:
|
|
case CHIP_ID_F81216AD:
|
|
case CHIP_ID_F81216H:
|
|
case CHIP_ID_F81216:
|
|
break;
|
|
default:
|
|
return -ENODEV;
|
|
}
|
|
|
|
pdata->pid = chip;
|
|
return 0;
|
|
}
|
|
|
|
static int fintek_8250_get_ldn_range(struct fintek_8250 *pdata, int *min,
|
|
int *max)
|
|
{
|
|
switch (pdata->pid) {
|
|
case CHIP_ID_F81966:
|
|
case CHIP_ID_F81865:
|
|
case CHIP_ID_F81866:
|
|
*min = F81866_LDN_LOW;
|
|
*max = F81866_LDN_HIGH;
|
|
return 0;
|
|
|
|
case CHIP_ID_F81216AD:
|
|
case CHIP_ID_F81216H:
|
|
case CHIP_ID_F81216:
|
|
*min = F81216_LDN_LOW;
|
|
*max = F81216_LDN_HIGH;
|
|
return 0;
|
|
}
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int fintek_8250_rs485_config(struct uart_port *port, struct ktermios *termios,
|
|
struct serial_rs485 *rs485)
|
|
{
|
|
uint8_t config = 0;
|
|
struct fintek_8250 *pdata = port->private_data;
|
|
|
|
if (!pdata)
|
|
return -EINVAL;
|
|
|
|
|
|
if (rs485->flags & SER_RS485_ENABLED) {
|
|
/* Hardware do not support same RTS level on send and receive */
|
|
if (!(rs485->flags & SER_RS485_RTS_ON_SEND) ==
|
|
!(rs485->flags & SER_RS485_RTS_AFTER_SEND))
|
|
return -EINVAL;
|
|
config |= RS485_URA;
|
|
}
|
|
|
|
if (rs485->delay_rts_before_send) {
|
|
rs485->delay_rts_before_send = 1;
|
|
config |= TXW4C_IRA;
|
|
}
|
|
|
|
if (rs485->delay_rts_after_send) {
|
|
rs485->delay_rts_after_send = 1;
|
|
config |= RXW4C_IRA;
|
|
}
|
|
|
|
if (rs485->flags & SER_RS485_RTS_ON_SEND)
|
|
config |= RTS_INVERT;
|
|
|
|
if (fintek_8250_enter_key(pdata->base_port, pdata->key))
|
|
return -EBUSY;
|
|
|
|
sio_write_reg(pdata, LDN, pdata->index);
|
|
sio_write_reg(pdata, RS485, config);
|
|
fintek_8250_exit_key(pdata->base_port);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void fintek_8250_set_irq_mode(struct fintek_8250 *pdata, bool is_level)
|
|
{
|
|
sio_write_reg(pdata, LDN, pdata->index);
|
|
|
|
switch (pdata->pid) {
|
|
case CHIP_ID_F81966:
|
|
case CHIP_ID_F81866:
|
|
sio_write_mask_reg(pdata, F81866_FIFO_CTRL, F81866_IRQ_MODE1,
|
|
0);
|
|
fallthrough;
|
|
case CHIP_ID_F81865:
|
|
sio_write_mask_reg(pdata, F81866_IRQ_MODE, F81866_IRQ_SHARE,
|
|
F81866_IRQ_SHARE);
|
|
sio_write_mask_reg(pdata, F81866_IRQ_MODE, F81866_IRQ_MODE0,
|
|
is_level ? 0 : F81866_IRQ_MODE0);
|
|
break;
|
|
|
|
case CHIP_ID_F81216AD:
|
|
case CHIP_ID_F81216H:
|
|
case CHIP_ID_F81216:
|
|
sio_write_mask_reg(pdata, FINTEK_IRQ_MODE, IRQ_SHARE,
|
|
IRQ_SHARE);
|
|
sio_write_mask_reg(pdata, FINTEK_IRQ_MODE, IRQ_MODE_MASK,
|
|
is_level ? IRQ_LEVEL_LOW : IRQ_EDGE_HIGH);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void fintek_8250_set_max_fifo(struct fintek_8250 *pdata)
|
|
{
|
|
switch (pdata->pid) {
|
|
case CHIP_ID_F81216H: /* 128Bytes FIFO */
|
|
case CHIP_ID_F81966:
|
|
case CHIP_ID_F81866:
|
|
sio_write_mask_reg(pdata, FIFO_CTRL,
|
|
FIFO_MODE_MASK | RXFTHR_MODE_MASK,
|
|
FIFO_MODE_128 | RXFTHR_MODE_4X);
|
|
break;
|
|
|
|
default: /* Default 16Bytes FIFO */
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void fintek_8250_set_termios(struct uart_port *port,
|
|
struct ktermios *termios,
|
|
const struct ktermios *old)
|
|
{
|
|
struct fintek_8250 *pdata = port->private_data;
|
|
unsigned int baud = tty_termios_baud_rate(termios);
|
|
int i;
|
|
u8 reg;
|
|
static u32 baudrate_table[] = {115200, 921600, 1152000, 1500000};
|
|
static u8 clock_table[] = { F81866_UART_CLK_1_8432MHZ,
|
|
F81866_UART_CLK_14_769MHZ, F81866_UART_CLK_18_432MHZ,
|
|
F81866_UART_CLK_24MHZ };
|
|
|
|
/*
|
|
* We'll use serial8250_do_set_termios() for baud = 0, otherwise It'll
|
|
* crash on baudrate_table[i] % baud with "division by zero".
|
|
*/
|
|
if (!baud)
|
|
goto exit;
|
|
|
|
switch (pdata->pid) {
|
|
case CHIP_ID_F81216H:
|
|
reg = RS485;
|
|
break;
|
|
case CHIP_ID_F81966:
|
|
case CHIP_ID_F81866:
|
|
reg = F81866_UART_CLK;
|
|
break;
|
|
default:
|
|
/* Don't change clocksource with unknown PID */
|
|
dev_warn(port->dev,
|
|
"%s: pid: %x Not support. use default set_termios.\n",
|
|
__func__, pdata->pid);
|
|
goto exit;
|
|
}
|
|
|
|
for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) {
|
|
if (baud > baudrate_table[i] || baudrate_table[i] % baud != 0)
|
|
continue;
|
|
|
|
if (port->uartclk == baudrate_table[i] * 16)
|
|
break;
|
|
|
|
if (fintek_8250_enter_key(pdata->base_port, pdata->key))
|
|
continue;
|
|
|
|
port->uartclk = baudrate_table[i] * 16;
|
|
|
|
sio_write_reg(pdata, LDN, pdata->index);
|
|
sio_write_mask_reg(pdata, reg, F81866_UART_CLK_MASK,
|
|
clock_table[i]);
|
|
|
|
fintek_8250_exit_key(pdata->base_port);
|
|
break;
|
|
}
|
|
|
|
if (i == ARRAY_SIZE(baudrate_table)) {
|
|
baud = tty_termios_baud_rate(old);
|
|
tty_termios_encode_baud_rate(termios, baud, baud);
|
|
}
|
|
|
|
exit:
|
|
serial8250_do_set_termios(port, termios, old);
|
|
}
|
|
|
|
static void fintek_8250_set_termios_handler(struct uart_8250_port *uart)
|
|
{
|
|
struct fintek_8250 *pdata = uart->port.private_data;
|
|
|
|
switch (pdata->pid) {
|
|
case CHIP_ID_F81216H:
|
|
case CHIP_ID_F81966:
|
|
case CHIP_ID_F81866:
|
|
uart->port.set_termios = fintek_8250_set_termios;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int probe_setup_port(struct fintek_8250 *pdata,
|
|
struct uart_8250_port *uart)
|
|
{
|
|
static const u16 addr[] = {0x4e, 0x2e};
|
|
static const u8 keys[] = {0x77, 0xa0, 0x87, 0x67};
|
|
struct irq_data *irq_data;
|
|
bool level_mode = false;
|
|
int i, j, k, min, max;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(addr); i++) {
|
|
for (j = 0; j < ARRAY_SIZE(keys); j++) {
|
|
pdata->base_port = addr[i];
|
|
pdata->key = keys[j];
|
|
|
|
if (fintek_8250_enter_key(addr[i], keys[j]))
|
|
continue;
|
|
if (fintek_8250_check_id(pdata) ||
|
|
fintek_8250_get_ldn_range(pdata, &min, &max)) {
|
|
fintek_8250_exit_key(addr[i]);
|
|
continue;
|
|
}
|
|
|
|
for (k = min; k < max; k++) {
|
|
u16 aux;
|
|
|
|
sio_write_reg(pdata, LDN, k);
|
|
aux = sio_read_reg(pdata, IO_ADDR1);
|
|
aux |= sio_read_reg(pdata, IO_ADDR2) << 8;
|
|
if (aux != uart->port.iobase)
|
|
continue;
|
|
|
|
pdata->index = k;
|
|
|
|
irq_data = irq_get_irq_data(uart->port.irq);
|
|
if (irq_data)
|
|
level_mode =
|
|
irqd_is_level_type(irq_data);
|
|
|
|
fintek_8250_set_irq_mode(pdata, level_mode);
|
|
fintek_8250_set_max_fifo(pdata);
|
|
|
|
fintek_8250_exit_key(addr[i]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
fintek_8250_exit_key(addr[i]);
|
|
}
|
|
}
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Only the first port supports delays */
|
|
static const struct serial_rs485 fintek_8250_rs485_supported_port0 = {
|
|
.flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | SER_RS485_RTS_AFTER_SEND,
|
|
.delay_rts_before_send = 1,
|
|
.delay_rts_after_send = 1,
|
|
};
|
|
|
|
static const struct serial_rs485 fintek_8250_rs485_supported = {
|
|
.flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | SER_RS485_RTS_AFTER_SEND,
|
|
};
|
|
|
|
static void fintek_8250_set_rs485_handler(struct uart_8250_port *uart)
|
|
{
|
|
struct fintek_8250 *pdata = uart->port.private_data;
|
|
|
|
switch (pdata->pid) {
|
|
case CHIP_ID_F81216AD:
|
|
case CHIP_ID_F81216H:
|
|
case CHIP_ID_F81966:
|
|
case CHIP_ID_F81866:
|
|
case CHIP_ID_F81865:
|
|
uart->port.rs485_config = fintek_8250_rs485_config;
|
|
if (!pdata->index)
|
|
uart->port.rs485_supported = fintek_8250_rs485_supported_port0;
|
|
else
|
|
uart->port.rs485_supported = fintek_8250_rs485_supported;
|
|
break;
|
|
|
|
default: /* No RS485 Auto direction functional */
|
|
break;
|
|
}
|
|
}
|
|
|
|
int fintek_8250_probe(struct uart_8250_port *uart)
|
|
{
|
|
struct fintek_8250 *pdata;
|
|
struct fintek_8250 probe_data;
|
|
|
|
if (probe_setup_port(&probe_data, uart))
|
|
return -ENODEV;
|
|
|
|
pdata = devm_kzalloc(uart->port.dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata)
|
|
return -ENOMEM;
|
|
|
|
memcpy(pdata, &probe_data, sizeof(probe_data));
|
|
uart->port.private_data = pdata;
|
|
fintek_8250_set_rs485_handler(uart);
|
|
fintek_8250_set_termios_handler(uart);
|
|
|
|
return 0;
|
|
}
|