arch/arm/plat-omap/include/plat/uncompress.h

   1 /*
   2  * arch/arm/plat-omap/include/mach/uncompress.h
   3  *
   4  * Serial port stubs for kernel decompress status messages
   5  *
   6  * Initially based on:
   7  * linux-2.4.15-rmk1-dsplinux1.6/arch/arm/plat-omap/include/mach1510/uncompress.h
   8  * Copyright (C) 2000 RidgeRun, Inc.
   9  * Author: Greg Lonnon <glonnon@ridgerun.com>
  10  *
  11  * Rewritten by:
  12  * Author: <source@mvista.com>
  13  * 2004 (c) MontaVista Software, Inc.
  14  *
  15  * This file is licensed under the terms of the GNU General Public License
  16  * version 2. This program is licensed "as is" without any warranty of any
  17  * kind, whether express or implied.
  18  */
  19
  20 #include <linux/types.h>
  21 #include <linux/serial_reg.h>
  22 #include <plat/serial.h>
  23
  24 unsigned int system_rev;
  25
  26 #define UART_OMAP_MDR1          0x08    /* mode definition register */
  27 #define OMAP_ID_730             0x355F
  28 #define OMAP_ID_850             0x362C
  29 #define ID_MASK                 0x7fff
  30 #define check_port(base, shift) ((base[UART_OMAP_MDR1 << shift] & 7) == 0)
  31 #define omap_get_id() ((*(volatile unsigned int *)(0xfffed404)) >> 12) & ID_MASK
  32
  33 static void putc(int c)
  34 {
  35         volatile u8 * uart = 0;
  36         int shift = 2;
  37
  38 #ifdef CONFIG_MACH_OMAP_PALMTE
  39         return;
  40 #endif
  41
  42 #ifdef CONFIG_ARCH_OMAP
  43 #ifdef  CONFIG_OMAP_LL_DEBUG_UART3
  44         uart = (volatile u8 *)(OMAP_UART3_BASE);
  45 #elif defined(CONFIG_OMAP_LL_DEBUG_UART2)
  46         uart = (volatile u8 *)(OMAP_UART2_BASE);
  47 #elif defined(CONFIG_OMAP_LL_DEBUG_UART1)
  48         uart = (volatile u8 *)(OMAP_UART1_BASE);
  49 #elif defined(CONFIG_OMAP_LL_DEBUG_NONE)
  50         return;
  51 #else
  52         return;
  53 #endif
  54
  55 #ifdef CONFIG_ARCH_OMAP1
  56         /* Determine which serial port to use */
  57         do {
  58                 /* MMU is not on, so cpu_is_omapXXXX() won't work here */
  59                 unsigned int omap_id = omap_get_id();
  60
  61                 if (omap_id == OMAP_ID_730 || omap_id == OMAP_ID_850)
  62                         shift = 0;
  63
  64                 if (check_port(uart, shift))
  65                         break;
  66                 /* Silent boot if no serial ports are enabled. */
  67                 return;
  68         } while (0);
  69 #endif /* CONFIG_ARCH_OMAP1 */
  70 #endif
  71
  72         /*
  73          * Now, xmit each character
  74          */
  75         while (!(uart[UART_LSR << shift] & UART_LSR_THRE))
  76                 barrier();
  77         uart[UART_TX << shift] = c;
  78 }
  79
  80 static inline void flush(void)
  81 {
  82 }
  83
  84 /*
  85  * nothing to do
  86  */
  87 #define arch_decomp_setup()
  88 #define arch_decomp_wdog()