FreeCalypso > hg > freecalypso-sw

annotate target-utils/libcommon/uartsel.c @ 1034:405b5469abc4 default tip

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author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 12 Jun 2016 19:06:34 +0000
parents a7b0b426f9ca
children
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1 /*
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2 * uart_select_init() figures out which UART was used to load us
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3 * through the boot ROM, and sets things up for us to use the same
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4 * UART for our communication.
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5 */
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6
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7 #include "types.h"
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8 #include "romvars.h"
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9 #include "ns16550.h"
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10 #include "halt.h"
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11
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12 extern struct ns16550_regs *uart_base;
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13
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14 static u16 rom_version;
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15 static struct boot_rom_vars *rom_vars;
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16 static char *uart_name;
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17
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18 uart_select_init()
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19 {
992
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20 rom_version = *(u16 *)0x1FFE;
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21
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22 switch (rom_version) {
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23 case 0x0200:
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24 rom_vars = (struct boot_rom_vars *) 0x800504;
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25 break;
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26 case 0x0300:
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27 rom_vars = (struct boot_rom_vars *) 0x800518;
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28 break;
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29 default:
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30 _exit(HALTCODE_BOOTROMVER);
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31 }
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32
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33 switch (rom_vars->uart_id) {
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34 case 0:
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35 uart_base = (struct ns16550_regs *) 0xFFFF5800;
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36 uart_name = "MODEM";
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37 break;
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38 case 1:
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39 uart_base = (struct ns16550_regs *) 0xFFFF5000;
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40 uart_name = "IrDA";
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41 break;
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42 default:
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43 _exit(HALTCODE_INVALIDUART);
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44 }
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45 }
992
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46
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47 print_boot_rom_info()
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48 {
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49 printf("Loaded via boot ROM v%04X, UART %d (%s) at baud rate #%d\n",
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50 rom_version, rom_vars->uart_id, uart_name,
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51 rom_vars->baud_rate_code);
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52 printf("CLKTCXO input autodetected to be %d MHz\n",
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53 rom_vars->clktcxo_13mhz ? 13 : 26);
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54 }