/* * Probe for F81216A LPC to 4 UART * * Based on drivers/tty/serial/8250_pnp.c, by Russell King, et al * * Copyright (C) 2014 Ricardo Ribalda, Qtechnology A/S * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License. */ #include #include #include #include #include #include "8250.h" #define ADDR_PORT 0 #define DATA_PORT 1 #define ENTRY_KEY 0x77 #define EXIT_KEY 0xAA #define CHIP_ID1 0x20 #define CHIP_ID2 0x21 #define CHIP_ID_0 0x1602 #define CHIP_ID_1 0x0501 #define VENDOR_ID1 0x23 #define VENDOR_ID1_VAL 0x19 #define VENDOR_ID2 0x24 #define VENDOR_ID2_VAL 0x34 #define LDN 0x7 #define RS485 0xF0 #define RTS_INVERT BIT(5) #define RS485_URA BIT(4) #define RXW4C_IRA BIT(3) #define TXW4C_IRA BIT(2) #define DRIVER_NAME "8250_fintek" struct fintek_8250 { u16 base_port; u8 index; long line; }; static int fintek_8250_enter_key(u16 base_port) { if (!request_muxed_region(base_port, 2, DRIVER_NAME)) return -EBUSY; outb(ENTRY_KEY, base_port + ADDR_PORT); outb(ENTRY_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_get_index(resource_size_t base_addr) { resource_size_t base[] = {0x3f8, 0x2f8, 0x3e8, 0x2e8}; int i; for (i = 0; i < ARRAY_SIZE(base); i++) if (base_addr == base[i]) return i; return -ENODEV; } static int fintek_8250_check_id(u16 base_port) { u16 chip; outb(VENDOR_ID1, base_port + ADDR_PORT); if (inb(base_port + DATA_PORT) != VENDOR_ID1_VAL) return -ENODEV; outb(VENDOR_ID2, base_port + ADDR_PORT); if (inb(base_port + DATA_PORT) != VENDOR_ID2_VAL) return -ENODEV; outb(CHIP_ID1, base_port + ADDR_PORT); chip = inb(base_port + DATA_PORT); outb(CHIP_ID2, base_port + ADDR_PORT); chip |= inb(base_port + DATA_PORT) << 8; if (chip != CHIP_ID_0 && chip != CHIP_ID_1) return -ENODEV; return 0; } static int fintek_8250_rs485_config(struct uart_port *port, 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) memset(rs485->padding, 0, sizeof(rs485->padding)); else memset(rs485, 0, sizeof(*rs485)); rs485->flags &= SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | SER_RS485_RTS_AFTER_SEND; 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)) == (!!(rs485->flags & SER_RS485_RTS_AFTER_SEND))) rs485->flags &= SER_RS485_ENABLED; else config |= RS485_URA; if (rs485->flags & SER_RS485_RTS_ON_SEND) config |= RTS_INVERT; if (fintek_8250_enter_key(pdata->base_port)) return -EBUSY; outb(LDN, pdata->base_port + ADDR_PORT); outb(pdata->index, pdata->base_port + DATA_PORT); outb(RS485, pdata->base_port + ADDR_PORT); outb(config, pdata->base_port + DATA_PORT); fintek_8250_exit_key(pdata->base_port); port->rs485 = *rs485; return 0; } static int fintek_8250_base_port(void) { static const u16 addr[] = {0x4e, 0x2e}; int i; for (i = 0; i < ARRAY_SIZE(addr); i++) { int ret; if (fintek_8250_enter_key(addr[i])) continue; ret = fintek_8250_check_id(addr[i]); fintek_8250_exit_key(addr[i]); if (!ret) return addr[i]; } return -ENODEV; } static int fintek_8250_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id) { struct uart_8250_port uart; struct fintek_8250 *pdata; int index; int base_port; if (!pnp_port_valid(dev, 0)) return -ENODEV; base_port = fintek_8250_base_port(); if (base_port < 0) return -ENODEV; index = fintek_8250_get_index(pnp_port_start(dev, 0)); if (index < 0) return -ENODEV; memset(&uart, 0, sizeof(uart)); pdata = devm_kzalloc(&dev->dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM; uart.port.private_data = pdata; if (!pnp_irq_valid(dev, 0)) return -ENODEV; uart.port.irq = pnp_irq(dev, 0); uart.port.iobase = pnp_port_start(dev, 0); uart.port.iotype = UPIO_PORT; uart.port.rs485_config = fintek_8250_rs485_config; uart.port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF; if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE) uart.port.flags |= UPF_SHARE_IRQ; uart.port.uartclk = 1843200; uart.port.dev = &dev->dev; pdata->base_port = base_port; pdata->index = index; pdata->line = serial8250_register_8250_port(&uart); if (pdata->line < 0) return -ENODEV; pnp_set_drvdata(dev, pdata); return 0; } static void fintek_8250_remove(struct pnp_dev *dev) { struct fintek_8250 *pdata = pnp_get_drvdata(dev); if (pdata) serial8250_unregister_port(pdata->line); } #ifdef CONFIG_PM static int fintek_8250_suspend(struct pnp_dev *dev, pm_message_t state) { struct fintek_8250 *pdata = pnp_get_drvdata(dev); if (!pdata) return -ENODEV; serial8250_suspend_port(pdata->line); return 0; } static int fintek_8250_resume(struct pnp_dev *dev) { struct fintek_8250 *pdata = pnp_get_drvdata(dev); if (!pdata) return -ENODEV; serial8250_resume_port(pdata->line); return 0; } #else #define fintek_8250_suspend NULL #define fintek_8250_resume NULL #endif /* CONFIG_PM */ static const struct pnp_device_id fintek_dev_table[] = { /* Qtechnology Panel PC / IO1000 */ { "PNP0501"}, {} }; MODULE_DEVICE_TABLE(pnp, fintek_dev_table); static struct pnp_driver fintek_8250_driver = { .name = DRIVER_NAME, .probe = fintek_8250_probe, .remove = fintek_8250_remove, .suspend = fintek_8250_suspend, .resume = fintek_8250_resume, .id_table = fintek_dev_table, }; module_pnp_driver(fintek_8250_driver); MODULE_DESCRIPTION("Fintek F812164 module"); MODULE_AUTHOR("Ricardo Ribalda "); MODULE_LICENSE("GPL");