minix/kernel/arch/i386/oxpcie.c

   1
   2 #include "kernel/kernel.h"
   3
   4 #if CONFIG_OXPCIE
   5
   6 /* Documentation is at http://www.plxtech.com/products/uart/oxpcie952 */
   7
   8 #include "oxpcie.h"
   9 #include "serial.h"
  10
  11 static unsigned char *oxpcie_vaddr = NULL;
  12
  13 void oxpcie_set_vaddr(unsigned char *vaddr)
  14 {
  15         oxpcie_vaddr = vaddr;
  16 }
  17
  18 static void oxpcie_init(void)
  19 {
  20         printf("oxpcie_init\n");
  21         /* Enable access to EFR and DLM+DLL */
  22         OXPCIE_LCR = 0xBF;
  23
  24         /* Set FICR[1] to increase FIFO */
  25         OXPCIE_FICR = 0x01;
  26
  27         /* Set enhanced mode [4]
  28          * no RTS/CTS [7:6]
  29          * no special char detection [5]
  30          * no in-band receive flow control [1:0]
  31          * no in-band transmit flow control [3:2]
  32          */
  33         OXPCIE_EFR  = 0x10;
  34
  35         /* Set divisor register to 115200 baud. */
  36         OXPCIE_DLM = 0x00;
  37         OXPCIE_DLL = 0x22;
  38
  39         /* Forget DLM and DLL, set LCR to config. */
  40         OXPCIE_LCR = LCR_CONFIG;
  41         OXPCIE_LCR = LCR_CONFIG;
  42
  43         OXPCIE_TCR = 0x01;
  44         OXPCIE_CPR = 0x20;
  45         OXPCIE_CPR2 = 0;
  46 }
  47
  48 void oxpcie_putc(char c)
  49 {
  50         static int inuse = 0;
  51
  52         if(vm_running && oxpcie_vaddr && !inuse) {
  53                 int i;
  54                 static int init_done;
  55                 inuse = 1;
  56
  57                 if(!init_done) {
  58                         oxpcie_init();
  59                         init_done = 1;
  60                 }
  61
  62                 for (i= 0; i<100000; i++) {
  63                         if(OXPCIE_LSR & LSR_THRE)
  64                                 break;
  65                 }
  66                 OXPCIE_THR = c;
  67                 inuse = 0;
  68         }
  69 }
  70
  71 int oxpcie_in(void)
  72 {
  73         if(vm_running && oxpcie_vaddr) {
  74                 int lsr;
  75                 lsr = OXPCIE_LSR;
  76                 if(lsr & LSR_DR)
  77                         return (int) OXPCIE_RBR;
  78         }
  79
  80         return -1;
  81 }
  82
  83 #endif