2 * Probe for F81216A LPC to 4 UART
4 * Based on drivers/tty/serial/8250_pnp.c, by Russell King, et al
6 * Copyright (C) 2014 Ricardo Ribalda, Qtechnology A/S
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License.
13 #include <linux/module.h>
14 #include <linux/pci.h>
15 #include <linux/pnp.h>
16 #include <linux/kernel.h>
17 #include <linux/serial_core.h>
20 #define ADDR_PORT 0x4E
21 #define DATA_PORT 0x4F
22 #define ENTRY_KEY 0x77
25 #define CHIP_ID1_VAL 0x02
27 #define CHIP_ID2_VAL 0x16
28 #define VENDOR_ID1 0x23
29 #define VENDOR_ID1_VAL 0x19
30 #define VENDOR_ID2 0x24
31 #define VENDOR_ID2_VAL 0x34
35 #define RTS_INVERT BIT(5)
36 #define RS485_URA BIT(4)
37 #define RXW4C_IRA BIT(3)
38 #define TXW4C_IRA BIT(2)
40 #define DRIVER_NAME "8250_fintek"
42 static int fintek_8250_enter_key(void){
44 if (!request_muxed_region(ADDR_PORT, 2, DRIVER_NAME))
47 outb(ENTRY_KEY, ADDR_PORT);
48 outb(ENTRY_KEY, ADDR_PORT);
52 static void fintek_8250_exit_key(void){
54 outb(EXIT_KEY, ADDR_PORT);
55 release_region(ADDR_PORT, 2);
58 static int fintek_8250_get_index(resource_size_t base_addr)
60 resource_size_t base[] = {0x3f8, 0x2f8, 0x3e8, 0x2e8};
63 for (i = 0; i < ARRAY_SIZE(base); i++)
64 if (base_addr == base[i])
70 static int fintek_8250_check_id(void)
73 outb(CHIP_ID1, ADDR_PORT);
74 if (inb(DATA_PORT) != CHIP_ID1_VAL)
77 outb(CHIP_ID2, ADDR_PORT);
78 if (inb(DATA_PORT) != CHIP_ID2_VAL)
81 outb(VENDOR_ID1, ADDR_PORT);
82 if (inb(DATA_PORT) != VENDOR_ID1_VAL)
85 outb(VENDOR_ID2, ADDR_PORT);
86 if (inb(DATA_PORT) != VENDOR_ID2_VAL)
92 static int fintek_8250_rs485_config(struct uart_port *port,
93 struct serial_rs485 *rs485)
96 int index = fintek_8250_get_index(port->iobase);
101 if (rs485->flags & SER_RS485_ENABLED)
102 memset(rs485->padding, 0, sizeof(rs485->padding));
104 memset(rs485, 0, sizeof(*rs485));
106 rs485->flags &= SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND |
107 SER_RS485_RTS_AFTER_SEND;
109 if (rs485->delay_rts_before_send) {
110 rs485->delay_rts_before_send = 1;
114 if (rs485->delay_rts_after_send) {
115 rs485->delay_rts_after_send = 1;
119 if ((!!(rs485->flags & SER_RS485_RTS_ON_SEND)) ==
120 (!!(rs485->flags & SER_RS485_RTS_AFTER_SEND)))
121 rs485->flags &= SER_RS485_ENABLED;
125 if (rs485->flags & SER_RS485_RTS_ON_SEND)
126 config |= RTS_INVERT;
128 if (fintek_8250_enter_key())
131 outb(LDN, ADDR_PORT);
132 outb(index, DATA_PORT);
133 outb(RS485, ADDR_PORT);
134 outb(config, DATA_PORT);
135 fintek_8250_exit_key();
137 port->rs485 = *rs485;
143 fintek_8250_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
146 struct uart_8250_port uart;
149 if (!pnp_port_valid(dev, 0))
152 if (fintek_8250_get_index(pnp_port_start(dev, 0)) < 0)
155 /* Enable configuration registers*/
156 if (fintek_8250_enter_key())
160 ret = fintek_8250_check_id();
161 fintek_8250_exit_key();
165 memset(&uart, 0, sizeof(uart));
166 if (!pnp_irq_valid(dev, 0))
168 uart.port.irq = pnp_irq(dev, 0);
169 uart.port.iobase = pnp_port_start(dev, 0);
170 uart.port.iotype = UPIO_PORT;
171 uart.port.rs485_config = fintek_8250_rs485_config;
173 uart.port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
174 if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE)
175 uart.port.flags |= UPF_SHARE_IRQ;
176 uart.port.uartclk = 1843200;
177 uart.port.dev = &dev->dev;
179 line = serial8250_register_8250_port(&uart);
183 pnp_set_drvdata(dev, (void *)((long)line + 1));
187 static void fintek_8250_remove(struct pnp_dev *dev)
189 long line = (long)pnp_get_drvdata(dev);
192 serial8250_unregister_port(line - 1);
196 static int fintek_8250_suspend(struct pnp_dev *dev, pm_message_t state)
198 long line = (long)pnp_get_drvdata(dev);
202 serial8250_suspend_port(line - 1);
206 static int fintek_8250_resume(struct pnp_dev *dev)
208 long line = (long)pnp_get_drvdata(dev);
212 serial8250_resume_port(line - 1);
216 #define fintek_8250_suspend NULL
217 #define fintek_8250_resume NULL
218 #endif /* CONFIG_PM */
220 static const struct pnp_device_id fintek_dev_table[] = {
221 /* Qtechnology Panel PC / IO1000 */
226 MODULE_DEVICE_TABLE(pnp, fintek_dev_table);
228 static struct pnp_driver fintek_8250_driver = {
230 .probe = fintek_8250_probe,
231 .remove = fintek_8250_remove,
232 .suspend = fintek_8250_suspend,
233 .resume = fintek_8250_resume,
234 .id_table = fintek_dev_table,
237 module_pnp_driver(fintek_8250_driver);
238 MODULE_DESCRIPTION("Fintek F812164 module");
239 MODULE_AUTHOR("Ricardo Ribalda <ricardo.ribalda@gmail.com>");
240 MODULE_LICENSE("GPL");