2 * Probe for F81216A LPC to 4 UART
4 * Copyright (C) 2014-2016 Ricardo Ribalda, Qtechnology A/S
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License.
11 #include <linux/module.h>
12 #include <linux/pci.h>
13 #include <linux/pnp.h>
14 #include <linux/kernel.h>
15 #include <linux/serial_core.h>
16 #include <linux/irq.h>
24 #define CHIP_ID_F81865 0x0407
25 #define CHIP_ID_F81866 0x1010
26 #define CHIP_ID_F81216AD 0x1602
27 #define CHIP_ID_F81216H 0x0501
28 #define CHIP_ID_F81216 0x0802
29 #define VENDOR_ID1 0x23
30 #define VENDOR_ID1_VAL 0x19
31 #define VENDOR_ID2 0x24
32 #define VENDOR_ID2_VAL 0x34
37 #define FINTEK_IRQ_MODE 0x70
38 #define IRQ_SHARE BIT(4)
39 #define IRQ_MODE_MASK (BIT(6) | BIT(5))
40 #define IRQ_LEVEL_LOW 0
41 #define IRQ_EDGE_HIGH BIT(5)
44 #define RTS_INVERT BIT(5)
45 #define RS485_URA BIT(4)
46 #define RXW4C_IRA BIT(3)
47 #define TXW4C_IRA BIT(2)
49 #define FIFO_CTRL 0xF6
50 #define FIFO_MODE_MASK (BIT(1) | BIT(0))
51 #define FIFO_MODE_128 (BIT(1) | BIT(0))
52 #define RXFTHR_MODE_MASK (BIT(5) | BIT(4))
53 #define RXFTHR_MODE_4X BIT(5)
55 #define F81216_LDN_LOW 0x0
56 #define F81216_LDN_HIGH 0x4
61 * The IRQ setting mode of F81866 is not the same with F81216 series.
62 * Level/Low: IRQ_MODE0:0, IRQ_MODE1:0
63 * Edge/High: IRQ_MODE0:1, IRQ_MODE1:0
65 * Clock speeds for UART (register F2h)
71 #define F81866_IRQ_MODE 0xf0
72 #define F81866_IRQ_SHARE BIT(0)
73 #define F81866_IRQ_MODE0 BIT(1)
75 #define F81866_FIFO_CTRL FIFO_CTRL
76 #define F81866_IRQ_MODE1 BIT(3)
78 #define F81866_LDN_LOW 0x10
79 #define F81866_LDN_HIGH 0x16
81 #define F81866_UART_CLK 0xF2
82 #define F81866_UART_CLK_MASK (BIT(1) | BIT(0))
83 #define F81866_UART_CLK_1_8432MHZ 0
84 #define F81866_UART_CLK_14_769MHZ (BIT(1) | BIT(0))
85 #define F81866_UART_CLK_18_432MHZ BIT(0)
86 #define F81866_UART_CLK_24MHZ BIT(1)
95 static u8 sio_read_reg(struct fintek_8250 *pdata, u8 reg)
97 outb(reg, pdata->base_port + ADDR_PORT);
98 return inb(pdata->base_port + DATA_PORT);
101 static void sio_write_reg(struct fintek_8250 *pdata, u8 reg, u8 data)
103 outb(reg, pdata->base_port + ADDR_PORT);
104 outb(data, pdata->base_port + DATA_PORT);
107 static void sio_write_mask_reg(struct fintek_8250 *pdata, u8 reg, u8 mask,
112 tmp = (sio_read_reg(pdata, reg) & ~mask) | (mask & data);
113 sio_write_reg(pdata, reg, tmp);
116 static int fintek_8250_enter_key(u16 base_port, u8 key)
118 if (!request_muxed_region(base_port, 2, "8250_fintek"))
121 outb(key, base_port + ADDR_PORT);
122 outb(key, base_port + ADDR_PORT);
126 static void fintek_8250_exit_key(u16 base_port)
129 outb(EXIT_KEY, base_port + ADDR_PORT);
130 release_region(base_port + ADDR_PORT, 2);
133 static int fintek_8250_check_id(struct fintek_8250 *pdata)
137 if (sio_read_reg(pdata, VENDOR_ID1) != VENDOR_ID1_VAL)
140 if (sio_read_reg(pdata, VENDOR_ID2) != VENDOR_ID2_VAL)
143 chip = sio_read_reg(pdata, CHIP_ID1);
144 chip |= sio_read_reg(pdata, CHIP_ID2) << 8;
149 case CHIP_ID_F81216AD:
150 case CHIP_ID_F81216H:
161 static int fintek_8250_get_ldn_range(struct fintek_8250 *pdata, int *min,
164 switch (pdata->pid) {
167 *min = F81866_LDN_LOW;
168 *max = F81866_LDN_HIGH;
171 case CHIP_ID_F81216AD:
172 case CHIP_ID_F81216H:
174 *min = F81216_LDN_LOW;
175 *max = F81216_LDN_HIGH;
182 static int fintek_8250_rs485_config(struct uart_port *port,
183 struct serial_rs485 *rs485)
186 struct fintek_8250 *pdata = port->private_data;
191 if (rs485->flags & SER_RS485_ENABLED)
192 memset(rs485->padding, 0, sizeof(rs485->padding));
194 memset(rs485, 0, sizeof(*rs485));
196 rs485->flags &= SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND |
197 SER_RS485_RTS_AFTER_SEND;
199 if (rs485->delay_rts_before_send) {
200 rs485->delay_rts_before_send = 1;
204 if (rs485->delay_rts_after_send) {
205 rs485->delay_rts_after_send = 1;
209 if ((!!(rs485->flags & SER_RS485_RTS_ON_SEND)) ==
210 (!!(rs485->flags & SER_RS485_RTS_AFTER_SEND)))
211 rs485->flags &= SER_RS485_ENABLED;
215 if (rs485->flags & SER_RS485_RTS_ON_SEND)
216 config |= RTS_INVERT;
218 if (fintek_8250_enter_key(pdata->base_port, pdata->key))
221 sio_write_reg(pdata, LDN, pdata->index);
222 sio_write_reg(pdata, RS485, config);
223 fintek_8250_exit_key(pdata->base_port);
225 port->rs485 = *rs485;
230 static void fintek_8250_set_irq_mode(struct fintek_8250 *pdata, bool is_level)
232 sio_write_reg(pdata, LDN, pdata->index);
234 switch (pdata->pid) {
236 sio_write_mask_reg(pdata, F81866_FIFO_CTRL, F81866_IRQ_MODE1,
240 sio_write_mask_reg(pdata, F81866_IRQ_MODE, F81866_IRQ_SHARE,
242 sio_write_mask_reg(pdata, F81866_IRQ_MODE, F81866_IRQ_MODE0,
243 is_level ? 0 : F81866_IRQ_MODE0);
246 case CHIP_ID_F81216AD:
247 case CHIP_ID_F81216H:
249 sio_write_mask_reg(pdata, FINTEK_IRQ_MODE, IRQ_SHARE,
251 sio_write_mask_reg(pdata, FINTEK_IRQ_MODE, IRQ_MODE_MASK,
252 is_level ? IRQ_LEVEL_LOW : IRQ_EDGE_HIGH);
257 static void fintek_8250_set_max_fifo(struct fintek_8250 *pdata)
259 switch (pdata->pid) {
260 case CHIP_ID_F81216H: /* 128Bytes FIFO */
262 sio_write_mask_reg(pdata, FIFO_CTRL,
263 FIFO_MODE_MASK | RXFTHR_MODE_MASK,
264 FIFO_MODE_128 | RXFTHR_MODE_4X);
267 default: /* Default 16Bytes FIFO */
272 static void fintek_8250_goto_highspeed(struct uart_8250_port *uart,
273 struct fintek_8250 *pdata)
275 sio_write_reg(pdata, LDN, pdata->index);
277 switch (pdata->pid) {
278 case CHIP_ID_F81866: /* set uart clock for high speed serial mode */
279 sio_write_mask_reg(pdata, F81866_UART_CLK,
280 F81866_UART_CLK_MASK,
281 F81866_UART_CLK_14_769MHZ);
283 uart->port.uartclk = 921600 * 16;
285 default: /* leave clock speed untouched */
290 static int probe_setup_port(struct fintek_8250 *pdata,
291 struct uart_8250_port *uart)
293 static const u16 addr[] = {0x4e, 0x2e};
294 static const u8 keys[] = {0x77, 0xa0, 0x87, 0x67};
295 struct irq_data *irq_data;
296 bool level_mode = false;
297 int i, j, k, min, max;
299 for (i = 0; i < ARRAY_SIZE(addr); i++) {
300 for (j = 0; j < ARRAY_SIZE(keys); j++) {
301 pdata->base_port = addr[i];
302 pdata->key = keys[j];
304 if (fintek_8250_enter_key(addr[i], keys[j]))
306 if (fintek_8250_check_id(pdata) ||
307 fintek_8250_get_ldn_range(pdata, &min, &max)) {
308 fintek_8250_exit_key(addr[i]);
312 for (k = min; k < max; k++) {
315 sio_write_reg(pdata, LDN, k);
316 aux = sio_read_reg(pdata, IO_ADDR1);
317 aux |= sio_read_reg(pdata, IO_ADDR2) << 8;
318 if (aux != uart->port.iobase)
323 irq_data = irq_get_irq_data(uart->port.irq);
326 irqd_is_level_type(irq_data);
328 fintek_8250_set_irq_mode(pdata, level_mode);
329 fintek_8250_set_max_fifo(pdata);
330 fintek_8250_goto_highspeed(uart, pdata);
332 fintek_8250_exit_key(addr[i]);
337 fintek_8250_exit_key(addr[i]);
344 static void fintek_8250_set_rs485_handler(struct uart_8250_port *uart)
346 struct fintek_8250 *pdata = uart->port.private_data;
348 switch (pdata->pid) {
349 case CHIP_ID_F81216AD:
350 case CHIP_ID_F81216H:
353 uart->port.rs485_config = fintek_8250_rs485_config;
356 default: /* No RS485 Auto direction functional */
361 int fintek_8250_probe(struct uart_8250_port *uart)
363 struct fintek_8250 *pdata;
364 struct fintek_8250 probe_data;
366 if (probe_setup_port(&probe_data, uart))
369 pdata = devm_kzalloc(uart->port.dev, sizeof(*pdata), GFP_KERNEL);
373 memcpy(pdata, &probe_data, sizeof(probe_data));
374 uart->port.private_data = pdata;
375 fintek_8250_set_rs485_handler(uart);