1 | /* |
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2 | * AMBA Plag & Play Bus Driver |
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3 | * |
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4 | * This driver hook performs bus scanning. |
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5 | * |
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6 | * COPYRIGHT (c) 2004. |
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7 | * Gaisler Research |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in the file LICENSE in this distribution or at |
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11 | * http://www.rtems.com/license/LICENSE. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #include <bsp.h> |
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17 | |
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18 | /* Structure containing address to devices found on the Amba Plug&Play bus */ |
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19 | amba_confarea_type amba_conf; |
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20 | |
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21 | /* GRLIB extended IRQ controller register */ |
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22 | extern void leon3_ext_irq_init(void); |
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23 | |
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24 | /* Pointers to Interrupt Controller configuration registers */ |
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25 | volatile LEON3_IrqCtrl_Regs_Map *LEON3_IrqCtrl_Regs; |
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26 | |
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27 | /* |
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28 | * amba_initialize |
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29 | * |
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30 | * Must be called just before drivers are initialized. |
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31 | * Used to scan system bus. Probes for AHB masters, AHB slaves and |
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32 | * APB slaves. Addresses to configuration areas of the AHB masters, |
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33 | * AHB slaves, APB slaves and APB master are storeds in |
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34 | * amba_ahb_masters, amba_ahb_slaves and amba. |
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35 | */ |
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36 | |
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37 | extern int scan_uarts(void); |
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38 | |
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39 | void amba_initialize(void) |
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40 | { |
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41 | int i; |
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42 | amba_apb_device dev; |
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43 | |
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44 | /* Scan the AMBA Plug&Play info at the default LEON3 area */ |
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45 | amba_scan(&amba_conf,LEON3_IO_AREA,NULL); |
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46 | |
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47 | /* Find LEON3 Interrupt controller */ |
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48 | i = amba_find_apbslv(&amba_conf,VENDOR_GAISLER,GAISLER_IRQMP,&dev); |
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49 | if (i <= 0){ |
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50 | /* PANIC IRQ controller not found! |
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51 | * |
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52 | * What else can we do but stop ... |
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53 | */ |
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54 | asm volatile( "mov 1, %g1; ta 0x0" ); |
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55 | } |
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56 | |
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57 | LEON3_IrqCtrl_Regs = (volatile LEON3_IrqCtrl_Regs_Map *) dev.start; |
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58 | |
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59 | /* Init Extended IRQ controller if available */ |
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60 | leon3_ext_irq_init(); |
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61 | |
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62 | /* find GP Timer */ |
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63 | i = amba_find_apbslv(&amba_conf,VENDOR_GAISLER,GAISLER_GPTIMER,&dev); |
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64 | if ( i > 0 ){ |
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65 | LEON3_Timer_Regs = (volatile LEON3_Timer_Regs_Map *) dev.start; |
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66 | } |
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67 | |
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68 | /* find UARTS */ |
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69 | scan_uarts(); |
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70 | } |
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