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Linux/arch/mips/jz4740/prom.c

  1 /*
  2  *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
  3  *  JZ4740 SoC prom code
  4  *
  5  *  This program is free software; you can redistribute it and/or modify it
  6  *  under  the terms of the GNU General  Public License as published by the
  7  *  Free Software Foundation;  either version 2 of the License, or (at your
  8  *  option) any later version.
  9  *
 10  *  You should have received a copy of the GNU General Public License along
 11  *  with this program; if not, write to the Free Software Foundation, Inc.,
 12  *  675 Mass Ave, Cambridge, MA 02139, USA.
 13  *
 14  */
 15 
 16 #include <linux/module.h>
 17 #include <linux/kernel.h>
 18 #include <linux/init.h>
 19 #include <linux/string.h>
 20 
 21 #include <linux/serial_reg.h>
 22 
 23 #include <asm/bootinfo.h>
 24 #include <asm/mach-jz4740/base.h>
 25 
 26 static __init void jz4740_init_cmdline(int argc, char *argv[])
 27 {
 28         unsigned int count = COMMAND_LINE_SIZE - 1;
 29         int i;
 30         char *dst = &(arcs_cmdline[0]);
 31         char *src;
 32 
 33         for (i = 1; i < argc && count; ++i) {
 34                 src = argv[i];
 35                 while (*src && count) {
 36                         *dst++ = *src++;
 37                         --count;
 38                 }
 39                 *dst++ = ' ';
 40         }
 41         if (i > 1)
 42                 --dst;
 43 
 44         *dst = 0;
 45 }
 46 
 47 void __init prom_init(void)
 48 {
 49         jz4740_init_cmdline((int)fw_arg0, (char **)fw_arg1);
 50         mips_machtype = MACH_INGENIC_JZ4740;
 51 }
 52 
 53 void __init prom_free_prom_memory(void)
 54 {
 55 }
 56 
 57 #define UART_REG(_reg) ((void __iomem *)CKSEG1ADDR(JZ4740_UART0_BASE_ADDR + (_reg << 2)))
 58 
 59 void prom_putchar(char c)
 60 {
 61         uint8_t lsr;
 62 
 63         do {
 64                 lsr = readb(UART_REG(UART_LSR));
 65         } while ((lsr & UART_LSR_TEMT) == 0);
 66 
 67         writeb(c, UART_REG(UART_TX));
 68 }
 69

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