src/system/kernel/arch/arm/arch_uart_8250.cpp

   1 /*
   2  * Copyright 2011-2012 Haiku, Inc. All rights reserved.
   3  * Distributed under the terms of the MIT License.
   4  *
   5  * Authors:
   6  *              François Revol, revol@free.fr
   7  */
   8
   9
  10 #include <arch/arm/reg.h>
  11 #include <arch/generic/debug_uart_8250.h>
  12 #include <debug.h>
  13 #include <new>
  14
  15
  16 class ArchUART8250 : public DebugUART8250 {
  17 public:
  18                                                         ArchUART8250(addr_t base, int64 clock);
  19                                                         ~ArchUART8250();
  20         void                                    InitEarly();
  21
  22         // ARM MMIO: on ARM the UART regs are aligned on 32bit
  23         virtual void                    Out8(int reg, uint8 value);
  24         virtual uint8                   In8(int reg);
  25 };
  26
  27
  28 ArchUART8250::ArchUART8250(addr_t base, int64 clock)
  29         :
  30         DebugUART8250(base, clock)
  31 {
  32 }
  33
  34
  35 ArchUART8250::~ArchUART8250()
  36 {
  37 }
  38
  39
  40 void
  41 ArchUART8250::InitEarly()
  42 {
  43         // Perform special hardware UART configuration
  44 #warning TODO: Detect OMAP3 from fdt!
  45 #if BOARD_CPU_OMAP3
  46         /* UART1 */
  47         RMWREG32(CM_FCLKEN1_CORE, 13, 1, 1);
  48         RMWREG32(CM_ICLKEN1_CORE, 13, 1, 1);
  49
  50         /* UART2 */
  51         RMWREG32(CM_FCLKEN1_CORE, 14, 1, 1);
  52         RMWREG32(CM_ICLKEN1_CORE, 14, 1, 1);
  53
  54         /* UART3 */
  55         RMWREG32(CM_FCLKEN_PER, 11, 1, 1);
  56         RMWREG32(CM_ICLKEN_PER, 11, 1, 1);
  57 #else
  58 #warning INTITIALIZE UART!!!!!
  59 #endif
  60 }
  61
  62
  63 void
  64 ArchUART8250::Out8(int reg, uint8 value)
  65 {
  66         *((uint8 *)Base() + reg * sizeof(uint32)) = value;
  67 }
  68
  69
  70 uint8
  71 ArchUART8250::In8(int reg)
  72 {
  73         return *((uint8 *)Base() + reg * sizeof(uint32));
  74 }
  75
  76
  77 DebugUART8250 *arch_get_uart_8250(addr_t base, int64 clock)
  78 {
  79         static char buffer[sizeof(ArchUART8250)];
  80         ArchUART8250 *uart = new(buffer) ArchUART8250(base, clock);
  81         return uart;
  82 }