Ralf Baechle | e7c4782 | 2007-07-10 17:33:01 +0100 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 2007 MIPS Technologies, Inc. |
| 7 | * written by Ralf Baechle (ralf@linux-mips.org) |
| 8 | * |
| 9 | * Probe driver for the Malta's UART ports: |
| 10 | * |
| 11 | * o 2 ports in the SMC SuperIO |
| 12 | * o 1 port in the CBUS UART, a discrete 16550 which normally is only used |
| 13 | * for bringups. |
| 14 | * |
| 15 | * We don't use 8250_platform.c on Malta as it would result in the CBUS |
| 16 | * UART becoming ttyS0. |
| 17 | */ |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/serial_8250.h> |
| 21 | |
| 22 | #define SMC_PORT(base, int) \ |
| 23 | { \ |
| 24 | .iobase = base, \ |
| 25 | .irq = int, \ |
| 26 | .uartclk = 1843200, \ |
| 27 | .iotype = UPIO_PORT, \ |
| 28 | .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST, \ |
| 29 | .regshift = 0, \ |
| 30 | } |
| 31 | |
| 32 | #define CBUS_UART_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_IOREMAP) |
| 33 | |
| 34 | static struct plat_serial8250_port uart8250_data[] = { |
| 35 | SMC_PORT(0x3F8, 4), |
| 36 | SMC_PORT(0x2F8, 3), |
| 37 | { |
| 38 | .mapbase = 0x1f000900, /* The CBUS UART */ |
| 39 | .irq = MIPS_CPU_IRQ_BASE + 2, |
| 40 | .uartclk = 3686400, /* Twice the usual clk! */ |
| 41 | .iotype = UPIO_MEM32, |
| 42 | .flags = CBUS_UART_FLAGS, |
| 43 | .regshift = 3, |
| 44 | }, |
| 45 | { }, |
| 46 | }; |
| 47 | |
| 48 | static struct platform_device uart8250_device = { |
| 49 | .name = "serial8250", |
| 50 | .id = PLAT8250_DEV_PLATFORM2, |
| 51 | .dev = { |
| 52 | .platform_data = uart8250_data, |
| 53 | }, |
| 54 | }; |
| 55 | |
| 56 | static int __init uart8250_init(void) |
| 57 | { |
| 58 | return platform_device_register(&uart8250_device); |
| 59 | } |
| 60 | |
| 61 | module_init(uart8250_init); |
| 62 | |
| 63 | MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>"); |
| 64 | MODULE_LICENSE("GPL"); |
| 65 | MODULE_DESCRIPTION("8250 UART probe driver for the Malta CBUS UART"); |