1 /* 2 * Probe for F81216A LPC to 4 UART 3 * 4 * Based on drivers/tty/serial/8250_pnp.c, by Russell King, et al 5 * 6 * Copyright (C) 2014 Ricardo Ribalda, Qtechnology A/S 7 * 8 * 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. 12 */ 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> 18 #include "8250.h" 19 20 #define ADDR_PORT 0 21 #define DATA_PORT 1 22 #define EXIT_KEY 0xAA 23 #define CHIP_ID1 0x20 24 #define CHIP_ID2 0x21 25 #define CHIP_ID_0 0x1602 26 #define CHIP_ID_1 0x0501 27 #define VENDOR_ID1 0x23 28 #define VENDOR_ID1_VAL 0x19 29 #define VENDOR_ID2 0x24 30 #define VENDOR_ID2_VAL 0x34 31 #define IO_ADDR1 0x61 32 #define IO_ADDR2 0x60 33 #define LDN 0x7 34 35 #define RS485 0xF0 36 #define RTS_INVERT BIT(5) 37 #define RS485_URA BIT(4) 38 #define RXW4C_IRA BIT(3) 39 #define TXW4C_IRA BIT(2) 40 41 #define DRIVER_NAME "8250_fintek" 42 43 struct fintek_8250 { 44 u16 base_port; 45 u8 index; 46 u8 key; 47 long line; 48 }; 49 50 static int fintek_8250_enter_key(u16 base_port, u8 key) 51 { 52 53 if (!request_muxed_region(base_port, 2, DRIVER_NAME)) 54 return -EBUSY; 55 56 outb(key, base_port + ADDR_PORT); 57 outb(key, base_port + ADDR_PORT); 58 return 0; 59 } 60 61 static void fintek_8250_exit_key(u16 base_port) 62 { 63 64 outb(EXIT_KEY, base_port + ADDR_PORT); 65 release_region(base_port + ADDR_PORT, 2); 66 } 67 68 static int fintek_8250_check_id(u16 base_port) 69 { 70 u16 chip; 71 72 outb(VENDOR_ID1, base_port + ADDR_PORT); 73 if (inb(base_port + DATA_PORT) != VENDOR_ID1_VAL) 74 return -ENODEV; 75 76 outb(VENDOR_ID2, base_port + ADDR_PORT); 77 if (inb(base_port + DATA_PORT) != VENDOR_ID2_VAL) 78 return -ENODEV; 79 80 outb(CHIP_ID1, base_port + ADDR_PORT); 81 chip = inb(base_port + DATA_PORT); 82 outb(CHIP_ID2, base_port + ADDR_PORT); 83 chip |= inb(base_port + DATA_PORT) << 8; 84 85 if (chip != CHIP_ID_0 && chip != CHIP_ID_1) 86 return -ENODEV; 87 88 return 0; 89 } 90 91 static int fintek_8250_rs485_config(struct uart_port *port, 92 struct serial_rs485 *rs485) 93 { 94 uint8_t config = 0; 95 struct fintek_8250 *pdata = port->private_data; 96 97 if (!pdata) 98 return -EINVAL; 99 100 if (rs485->flags & SER_RS485_ENABLED) 101 memset(rs485->padding, 0, sizeof(rs485->padding)); 102 else 103 memset(rs485, 0, sizeof(*rs485)); 104 105 rs485->flags &= SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | 106 SER_RS485_RTS_AFTER_SEND; 107 108 if (rs485->delay_rts_before_send) { 109 rs485->delay_rts_before_send = 1; 110 config |= TXW4C_IRA; 111 } 112 113 if (rs485->delay_rts_after_send) { 114 rs485->delay_rts_after_send = 1; 115 config |= RXW4C_IRA; 116 } 117 118 if ((!!(rs485->flags & SER_RS485_RTS_ON_SEND)) == 119 (!!(rs485->flags & SER_RS485_RTS_AFTER_SEND))) 120 rs485->flags &= SER_RS485_ENABLED; 121 else 122 config |= RS485_URA; 123 124 if (rs485->flags & SER_RS485_RTS_ON_SEND) 125 config |= RTS_INVERT; 126 127 if (fintek_8250_enter_key(pdata->base_port, pdata->key)) 128 return -EBUSY; 129 130 outb(LDN, pdata->base_port + ADDR_PORT); 131 outb(pdata->index, pdata->base_port + DATA_PORT); 132 outb(RS485, pdata->base_port + ADDR_PORT); 133 outb(config, pdata->base_port + DATA_PORT); 134 fintek_8250_exit_key(pdata->base_port); 135 136 port->rs485 = *rs485; 137 138 return 0; 139 } 140 141 static int fintek_8250_base_port(u16 io_address, u8 *key, u8 *index) 142 { 143 static const u16 addr[] = {0x4e, 0x2e}; 144 static const u8 keys[] = {0x77, 0xa0, 0x87, 0x67}; 145 int i, j, k; 146 147 for (i = 0; i < ARRAY_SIZE(addr); i++) { 148 for (j = 0; j < ARRAY_SIZE(keys); j++) { 149 150 if (fintek_8250_enter_key(addr[i], keys[j])) 151 continue; 152 if (fintek_8250_check_id(addr[i])) { 153 fintek_8250_exit_key(addr[i]); 154 continue; 155 } 156 157 for (k = 0; k < 4; k++) { 158 u16 aux; 159 160 outb(LDN, addr[i] + ADDR_PORT); 161 outb(k, addr[i] + DATA_PORT); 162 163 outb(IO_ADDR1, addr[i] + ADDR_PORT); 164 aux = inb(addr[i] + DATA_PORT); 165 outb(IO_ADDR2, addr[i] + ADDR_PORT); 166 aux |= inb(addr[i] + DATA_PORT) << 8; 167 if (aux != io_address) 168 continue; 169 170 fintek_8250_exit_key(addr[i]); 171 *key = keys[j]; 172 *index = k; 173 return addr[i]; 174 } 175 fintek_8250_exit_key(addr[i]); 176 } 177 } 178 179 return -ENODEV; 180 } 181 182 static int 183 fintek_8250_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id) 184 { 185 struct uart_8250_port uart; 186 struct fintek_8250 *pdata; 187 int base_port; 188 u8 key; 189 u8 index; 190 191 if (!pnp_port_valid(dev, 0)) 192 return -ENODEV; 193 194 base_port = fintek_8250_base_port(pnp_port_start(dev, 0), &key, &index); 195 if (base_port < 0) 196 return -ENODEV; 197 198 memset(&uart, 0, sizeof(uart)); 199 200 pdata = devm_kzalloc(&dev->dev, sizeof(*pdata), GFP_KERNEL); 201 if (!pdata) 202 return -ENOMEM; 203 uart.port.private_data = pdata; 204 205 if (!pnp_irq_valid(dev, 0)) 206 return -ENODEV; 207 uart.port.irq = pnp_irq(dev, 0); 208 uart.port.iobase = pnp_port_start(dev, 0); 209 uart.port.iotype = UPIO_PORT; 210 uart.port.rs485_config = fintek_8250_rs485_config; 211 212 uart.port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF; 213 if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE) 214 uart.port.flags |= UPF_SHARE_IRQ; 215 uart.port.uartclk = 1843200; 216 uart.port.dev = &dev->dev; 217 218 pdata->key = key; 219 pdata->base_port = base_port; 220 pdata->index = index; 221 pdata->line = serial8250_register_8250_port(&uart); 222 if (pdata->line < 0) 223 return -ENODEV; 224 225 pnp_set_drvdata(dev, pdata); 226 return 0; 227 } 228 229 static void fintek_8250_remove(struct pnp_dev *dev) 230 { 231 struct fintek_8250 *pdata = pnp_get_drvdata(dev); 232 233 if (pdata) 234 serial8250_unregister_port(pdata->line); 235 } 236 237 #ifdef CONFIG_PM 238 static int fintek_8250_suspend(struct pnp_dev *dev, pm_message_t state) 239 { 240 struct fintek_8250 *pdata = pnp_get_drvdata(dev); 241 242 if (!pdata) 243 return -ENODEV; 244 serial8250_suspend_port(pdata->line); 245 return 0; 246 } 247 248 static int fintek_8250_resume(struct pnp_dev *dev) 249 { 250 struct fintek_8250 *pdata = pnp_get_drvdata(dev); 251 252 if (!pdata) 253 return -ENODEV; 254 serial8250_resume_port(pdata->line); 255 return 0; 256 } 257 #else 258 #define fintek_8250_suspend NULL 259 #define fintek_8250_resume NULL 260 #endif /* CONFIG_PM */ 261 262 static const struct pnp_device_id fintek_dev_table[] = { 263 /* Qtechnology Panel PC / IO1000 */ 264 { "PNP0501"}, 265 {} 266 }; 267 268 MODULE_DEVICE_TABLE(pnp, fintek_dev_table); 269 270 static struct pnp_driver fintek_8250_driver = { 271 .name = DRIVER_NAME, 272 .probe = fintek_8250_probe, 273 .remove = fintek_8250_remove, 274 .suspend = fintek_8250_suspend, 275 .resume = fintek_8250_resume, 276 .id_table = fintek_dev_table, 277 }; 278 279 module_pnp_driver(fintek_8250_driver); 280 MODULE_DESCRIPTION("Fintek F812164 module"); 281 MODULE_AUTHOR("Ricardo Ribalda <ricardo.ribalda@gmail.com>"); 282 MODULE_LICENSE("GPL"); 283