arch/arm/mach-omap1/include/mach/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
  23 #include <asm/memory.h>
  24 #include <asm/mach-types.h>
  25
  26 #include "serial.h"
  27
  28 #define MDR1_MODE_MASK                  0x07
  29
  30 volatile u8 *uart_base;
  31 int uart_shift;
  32
  33 /*
  34  * Store the DEBUG_LL uart number into memory.
  35  * See also debug-macro.S, and serial.c for related code.
  36  */
  37 static void set_omap_uart_info(unsigned char port)
  38 {
  39         /*
  40          * Get address of some.bss variable and round it down
  41          * a la CONFIG_AUTO_ZRELADDR.
  42          */
  43         u32 ram_start = (u32)&uart_shift & 0xf8000000;
  44         u32 *uart_info = (u32 *)(ram_start + OMAP_UART_INFO_OFS);
  45         *uart_info = port;
  46 }
  47
  48 static inline void putc(int c)
  49 {
  50         if (!uart_base)
  51                 return;
  52
  53         /* Check for UART 16x mode */
  54         if ((uart_base[UART_OMAP_MDR1 << uart_shift] & MDR1_MODE_MASK) != 0)
  55                 return;
  56
  57         while (!(uart_base[UART_LSR << uart_shift] & UART_LSR_THRE))
  58                 barrier();
  59         uart_base[UART_TX << uart_shift] = c;
  60 }
  61
  62 static inline void flush(void)
  63 {
  64 }
  65
  66 /*
  67  * Macros to configure UART1 and debug UART
  68  */
  69 #define _DEBUG_LL_ENTRY(mach, dbg_uart, dbg_shft, dbg_id)               \
  70         if (machine_is_##mach()) {                                      \
  71                 uart_base = (volatile u8 *)(dbg_uart);                  \
  72                 uart_shift = (dbg_shft);                                \
  73                 port = (dbg_id);                                        \
  74                 set_omap_uart_info(port);                               \
  75                 break;                                                  \
  76         }
  77
  78 #define DEBUG_LL_OMAP7XX(p, mach)                                       \
  79         _DEBUG_LL_ENTRY(mach, OMAP1_UART##p##_BASE, OMAP7XX_PORT_SHIFT, \
  80                 OMAP1UART##p)
  81
  82 #define DEBUG_LL_OMAP1(p, mach)                                         \
  83         _DEBUG_LL_ENTRY(mach, OMAP1_UART##p##_BASE, OMAP_PORT_SHIFT,    \
  84                 OMAP1UART##p)
  85
  86 static inline void arch_decomp_setup(void)
  87 {
  88         int port = 0;
  89
  90         /*
  91          * Initialize the port based on the machine ID from the bootloader.
  92          * Note that we're using macros here instead of switch statement
  93          * as machine_is functions are optimized out for the boards that
  94          * are not selected.
  95          */
  96         do {
  97                 /* omap7xx/8xx based boards using UART1 with shift 0 */
  98                 DEBUG_LL_OMAP7XX(1, herald);
  99                 DEBUG_LL_OMAP7XX(1, omap_perseus2);
 100
 101                 /* omap15xx/16xx based boards using UART1 */
 102                 DEBUG_LL_OMAP1(1, ams_delta);
 103                 DEBUG_LL_OMAP1(1, nokia770);
 104                 DEBUG_LL_OMAP1(1, omap_h2);
 105                 DEBUG_LL_OMAP1(1, omap_h3);
 106                 DEBUG_LL_OMAP1(1, omap_innovator);
 107                 DEBUG_LL_OMAP1(1, omap_osk);
 108                 DEBUG_LL_OMAP1(1, omap_palmte);
 109                 DEBUG_LL_OMAP1(1, omap_palmz71);
 110
 111                 /* omap15xx/16xx based boards using UART2 */
 112                 DEBUG_LL_OMAP1(2, omap_palmtt);
 113
 114                 /* omap15xx/16xx based boards using UART3 */
 115                 DEBUG_LL_OMAP1(3, sx1);
 116         } while (0);
 117 }