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) 2006, 07 MIPS Technologies, Inc. 7 * written by Ralf Baechle (ralf@linux-mips.org) 8 * written by Ralf Baechle <ralf@linux-mips.org> 9 * 10 * Copyright (C) 2008 Wind River Systems, Inc. 11 * updated by Tiejun Chen <tiejun.chen@windriver.com> 12 * 13 * 1. Probe driver for the Malta's UART ports: 14 * 15 * o 2 ports in the SMC SuperIO 16 * o 1 port in the CBUS UART, a discrete 16550 which normally is only used 17 * for bringups. 18 * 19 * We don't use 8250_platform.c on Malta as it would result in the CBUS 20 * UART becoming ttyS0. 21 * 22 * 2. Register RTC-CMOS platform device on Malta. 23 */ 24 #include <linux/init.h> 25 #include <linux/serial_8250.h> 26 #include <linux/irq.h> 27 #include <linux/platform_device.h> 28 #include <asm/mips-boards/maltaint.h> 29 30 #define SMC_PORT(base, int) \ 31 { \ 32 .iobase = base, \ 33 .irq = int, \ 34 .uartclk = 1843200, \ 35 .iotype = UPIO_PORT, \ 36 .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | \ 37 UPF_MAGIC_MULTIPLIER, \ 38 .regshift = 0, \ 39 } 40 41 #define CBUS_UART_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_IOREMAP) 42 43 static struct plat_serial8250_port uart8250_data[] = { 44 SMC_PORT(0x3F8, 4), 45 SMC_PORT(0x2F8, 3), 46 #ifndef CONFIG_MIPS_CMP 47 { 48 .mapbase = 0x1f000900, /* The CBUS UART */ 49 .irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_MB2, 50 .uartclk = 3686400, /* Twice the usual clk! */ 51 .iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ? 52 UPIO_MEM32BE : UPIO_MEM32, 53 .flags = CBUS_UART_FLAGS, 54 .regshift = 3, 55 }, 56 #endif 57 { }, 58 }; 59 60 static struct platform_device malta_uart8250_device = { 61 .name = "serial8250", 62 .id = PLAT8250_DEV_PLATFORM, 63 .dev = { 64 .platform_data = uart8250_data, 65 }, 66 }; 67 68 static struct platform_device *malta_devices[] __initdata = { 69 &malta_uart8250_device, 70 }; 71 72 static int __init malta_add_devices(void) 73 { 74 return platform_add_devices(malta_devices, ARRAY_SIZE(malta_devices)); 75 } 76 77 device_initcall(malta_add_devices); 78