serial: Add support for Fintek F81216A LPC to 4 UART
This patch lets you set the RS485 cappabilites of the device through TIOCSRS485 and TIOCGRS485 as defined on Documentation/serial/serial-rs485.txt In order to probe the device, the PNP id and the device id is used. Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ricardo Ribalda Delgado
Greg Kroah-Hartman
parent
e676253b19
commit
28e3fb6c4d
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@ -0,0 +1,249 @@
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/*
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* Probe for F81216A LPC to 4 UART
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*
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* Based on drivers/tty/serial/8250_pnp.c, by Russell King, et al
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*
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* Copyright (C) 2014 Ricardo Ribalda, Qtechnology A/S
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License.
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/pnp.h>
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#include <linux/kernel.h>
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#include <linux/serial_core.h>
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#include "8250.h"
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#define ADDR_PORT 0x4E
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#define DATA_PORT 0x4F
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#define ENTRY_KEY 0x77
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#define EXIT_KEY 0xAA
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#define CHIP_ID1 0x20
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#define CHIP_ID1_VAL 0x02
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#define CHIP_ID2 0x21
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#define CHIP_ID2_VAL 0x16
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#define VENDOR_ID1 0x23
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#define VENDOR_ID1_VAL 0x19
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#define VENDOR_ID2 0x24
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#define VENDOR_ID2_VAL 0x34
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#define LDN 0x7
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#define RS485 0xF0
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#define RTS_INVERT BIT(5)
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#define RS485_URA BIT(4)
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#define RXW4C_IRA BIT(3)
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#define TXW4C_IRA BIT(2)
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#define DRIVER_NAME "8250_fintek"
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static int fintek_8250_enter_key(void){
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if (!request_muxed_region(ADDR_PORT, 2, DRIVER_NAME))
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return -EBUSY;
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outb(ENTRY_KEY, ADDR_PORT);
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outb(ENTRY_KEY, ADDR_PORT);
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return 0;
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}
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static void fintek_8250_exit_key(void){
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outb(EXIT_KEY, ADDR_PORT);
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release_region(ADDR_PORT, 2);
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}
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static int fintek_8250_get_index(resource_size_t base_addr)
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{
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resource_size_t base[] = {0x3f8, 0x2f8, 0x3e8, 0x2e8};
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int i;
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for (i = 0; i < ARRAY_SIZE(base); i++)
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if (base_addr == base[i])
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return i;
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return -ENODEV;
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}
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static int fintek_8250_check_id(void)
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{
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outb(CHIP_ID1, ADDR_PORT);
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if (inb(DATA_PORT) != CHIP_ID1_VAL)
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return -ENODEV;
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outb(CHIP_ID2, ADDR_PORT);
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if (inb(DATA_PORT) != CHIP_ID2_VAL)
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return -ENODEV;
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outb(VENDOR_ID1, ADDR_PORT);
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if (inb(DATA_PORT) != VENDOR_ID1_VAL)
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return -ENODEV;
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outb(VENDOR_ID2, ADDR_PORT);
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if (inb(DATA_PORT) != VENDOR_ID2_VAL)
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return -ENODEV;
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return 0;
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}
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static int fintek_8250_rs4850_config(struct uart_8250_port *uart,
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struct serial_rs485 *rs485)
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{
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uint8_t config = 0;
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int index = fintek_8250_get_index(uart->port.iobase);
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if (index < 0)
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return -EINVAL;
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if (rs485->flags & SER_RS485_ENABLED)
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memset(rs485->padding, 0, sizeof(rs485->padding));
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else
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memset(rs485, 0, sizeof(*rs485));
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rs485->flags &= SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND |
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SER_RS485_RTS_AFTER_SEND;
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if (rs485->delay_rts_before_send) {
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rs485->delay_rts_before_send = 1;
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config |= TXW4C_IRA;
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}
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if (rs485->delay_rts_after_send) {
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rs485->delay_rts_after_send = 1;
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config |= RXW4C_IRA;
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}
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if ((!!(rs485->flags & SER_RS485_RTS_ON_SEND)) ==
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(!!(rs485->flags & SER_RS485_RTS_AFTER_SEND)))
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rs485->flags &= SER_RS485_ENABLED;
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else
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config |= RS485_URA;
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if (rs485->flags & SER_RS485_RTS_ON_SEND)
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config |= RTS_INVERT;
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if (fintek_8250_enter_key())
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return -EBUSY;
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outb(LDN, ADDR_PORT);
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outb(index, DATA_PORT);
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outb(RS485, ADDR_PORT);
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outb(config, DATA_PORT);
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fintek_8250_exit_key();
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return 0;
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}
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static int
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fintek_8250_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
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{
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int line;
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struct uart_8250_port uart;
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int ret;
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if (!pnp_port_valid(dev, 0))
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return -ENODEV;
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if (fintek_8250_get_index(pnp_port_start(dev, 0)) < 0)
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return -ENODEV;
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/* Enable configuration registers*/
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if (fintek_8250_enter_key())
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return -EBUSY;
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/*Check ID*/
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ret = fintek_8250_check_id();
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fintek_8250_exit_key();
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if (ret)
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return ret;
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memset(&uart, 0, sizeof(uart));
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if (!pnp_irq_valid(dev, 0))
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return -ENODEV;
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uart.port.irq = pnp_irq(dev, 0);
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uart.port.iobase = pnp_port_start(dev, 0);
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uart.port.iotype = UPIO_PORT;
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uart.rs485_config = fintek_8250_rs4850_config;
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uart.port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
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if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE)
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uart.port.flags |= UPF_SHARE_IRQ;
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uart.port.uartclk = 1843200;
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uart.port.dev = &dev->dev;
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line = serial8250_register_8250_port(&uart);
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if (line < 0)
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return -ENODEV;
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pnp_set_drvdata(dev, (void *)((long)line + 1));
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return 0;
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}
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static void fintek_8250_remove(struct pnp_dev *dev)
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{
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long line = (long)pnp_get_drvdata(dev);
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if (line)
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serial8250_unregister_port(line - 1);
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}
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#ifdef CONFIG_PM
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static int fintek_8250_suspend(struct pnp_dev *dev, pm_message_t state)
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{
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long line = (long)pnp_get_drvdata(dev);
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if (!line)
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return -ENODEV;
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serial8250_suspend_port(line - 1);
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return 0;
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}
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static int fintek_8250_resume(struct pnp_dev *dev)
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{
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long line = (long)pnp_get_drvdata(dev);
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if (!line)
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return -ENODEV;
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serial8250_resume_port(line - 1);
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return 0;
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}
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#else
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#define fintek_8250_suspend NULL
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#define fintek_8250_resume NULL
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#endif /* CONFIG_PM */
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static const struct pnp_device_id fintek_dev_table[] = {
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/* Qtechnology Panel PC / IO1000 */
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{ "PNP0501"},
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{}
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};
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MODULE_DEVICE_TABLE(pnp, fintek_dev_table);
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static struct pnp_driver fintek_8250_driver = {
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.name = DRIVER_NAME,
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.probe = fintek_8250_probe,
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.remove = fintek_8250_remove,
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.suspend = fintek_8250_suspend,
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.resume = fintek_8250_resume,
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.id_table = fintek_dev_table,
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};
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static int fintek_8250_init(void)
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{
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return pnp_register_driver(&fintek_8250_driver);
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}
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module_init(fintek_8250_init);
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static void fintek_8250_exit(void)
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{
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pnp_unregister_driver(&fintek_8250_driver);
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}
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module_exit(fintek_8250_exit);
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MODULE_DESCRIPTION("Fintek F812164 module");
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MODULE_AUTHOR("Ricardo Ribalda <ricardo.ribalda@gmail.com>");
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MODULE_LICENSE("GPL");
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@ -298,3 +298,12 @@ config SERIAL_8250_RT288X
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If you have a Ralink RT288x/RT305x SoC based board and want to use the
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serial port, say Y to this option. The driver can handle up to 2 serial
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ports. If unsure, say N.
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config SERIAL_8250_FINTEK
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tristate "Support for Fintek F81216A LPC to 4 UART"
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depends on SERIAL_8250 && PNP
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help
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Selecting this option will add support for the Fintek F81216A
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LPC to 4 UART. This device has some RS485 functionality not available
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through the PNP driver. If unsure, say N.
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@ -20,3 +20,4 @@ obj-$(CONFIG_SERIAL_8250_HUB6) += 8250_hub6.o
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obj-$(CONFIG_SERIAL_8250_FSL) += 8250_fsl.o
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obj-$(CONFIG_SERIAL_8250_DW) += 8250_dw.o
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obj-$(CONFIG_SERIAL_8250_EM) += 8250_em.o
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obj-$(CONFIG_SERIAL_8250_FINTEK) += 8250_fintek.o
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