From ca585cf9fb818bfcfcac6968c2b242dcd0693b08 Mon Sep 17 00:00:00 2001 From: Kelvin Cheung Date: Wed, 25 Jul 2012 16:17:24 +0200 Subject: MIPS: Loongson 1B: Add board support Adds basic platform devices for Loongson 1B, including serial port, ethernet, USB, RTC and interrupt handler. The Loongson 1B UART is compatible with NS16550A, the Loongson 1B GMAC is built around a Synopsys IP Core. Use normal instead of enhanced descriptors. Thanks to Giuseppe for updating the normal descriptor in stmmac driver. Thanks to Zhao Zhang for implementing the RTC driver. Signed-off-by: Kelvin Cheung Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: wuzhangjin@gmail.com Cc: zhzhl555@gmail.com Cc: Kelvin Cheung Patchwork: https://patchwork.linux-mips.org/patch/4133/ Patchwork: https://patchwork.linux-mips.org/patch/4134/ Signed-off-by: Ralf Baechle --- arch/mips/loongson1/common/prom.c | 87 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 87 insertions(+) create mode 100644 arch/mips/loongson1/common/prom.c (limited to 'arch/mips/loongson1/common/prom.c') diff --git a/arch/mips/loongson1/common/prom.c b/arch/mips/loongson1/common/prom.c new file mode 100644 index 000000000000..1f8e49f9886d --- /dev/null +++ b/arch/mips/loongson1/common/prom.c @@ -0,0 +1,87 @@ +/* + * Copyright (c) 2011 Zhang, Keguang + * + * Modified from arch/mips/pnx833x/common/prom.c. + * + * 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, or (at your + * option) any later version. + */ + +#include +#include + +#include +#include + +int prom_argc; +char **prom_argv, **prom_envp; +unsigned long memsize, highmemsize; + +char *prom_getenv(char *envname) +{ + char **env = prom_envp; + int i; + + i = strlen(envname); + + while (*env) { + if (strncmp(envname, *env, i) == 0 && *(*env+i) == '=') + return *env + i + 1; + env++; + } + + return 0; +} + +static inline unsigned long env_or_default(char *env, unsigned long dfl) +{ + char *str = prom_getenv(env); + return str ? simple_strtol(str, 0, 0) : dfl; +} + +void __init prom_init_cmdline(void) +{ + char *c = &(arcs_cmdline[0]); + int i; + + for (i = 1; i < prom_argc; i++) { + strcpy(c, prom_argv[i]); + c += strlen(prom_argv[i]); + if (i < prom_argc-1) + *c++ = ' '; + } + *c = 0; +} + +void __init prom_init(void) +{ + prom_argc = fw_arg0; + prom_argv = (char **)fw_arg1; + prom_envp = (char **)fw_arg2; + + prom_init_cmdline(); + + memsize = env_or_default("memsize", DEFAULT_MEMSIZE); + highmemsize = env_or_default("highmemsize", 0x0); +} + +void __init prom_free_prom_memory(void) +{ +} + +#define PORT(offset) (u8 *)(KSEG1ADDR(LS1X_UART0_BASE + offset)) + +void __init prom_putchar(char c) +{ + int timeout; + + timeout = 1024; + + while (((readb(PORT(UART_LSR)) & UART_LSR_THRE) == 0) + && (timeout-- > 0)) + ; + + writeb(c, PORT(UART_TX)); +} -- cgit v1.2.1