Last change
on this file since 280 was
276,
checked in by bouyer, 12 years ago
|
A boot loader to be stored in ROM of a TSAR platform.
Based on Cesar FUGUET's work.
Platform-specific files are in a subdirectory, e.g. platform_fpga_de2-115,
so the same code can be targetted to different platforms.
The platform is selected with the PLATFORM_DIR environnement variable.
The supported variant are soclib and fpga, the later being the default
and the former selected by defining the SOCLIB environnement variable.
The boot loader embeds a binary device tree describing the platform,
to be used by the loaded software.
|
File size:
1.3 KB
|
Line | |
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1 | /** |
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2 | * \file io.h |
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3 | * \date 5 September 2012 |
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4 | * \author Cesar Fuguet |
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5 | * |
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6 | * Utility functions to write or read memory mapped hardware registers |
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7 | */ |
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8 | #ifndef IO_H |
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9 | #define IO_H |
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10 | |
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11 | #define in_reset __attribute__((section (".reset"))) |
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12 | |
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13 | /** |
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14 | * Read an 32 bits memory mapped hardware register |
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15 | */ |
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16 | in_reset static inline unsigned int ioread32(void * addr) |
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17 | { |
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18 | return *(volatile unsigned int *) addr; |
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19 | } |
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20 | |
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21 | /** |
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22 | * Read an 16 bits memory mapped hardware register |
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23 | */ |
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24 | in_reset static inline unsigned short ioread16(void * addr) |
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25 | { |
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26 | return *(volatile unsigned short *) addr; |
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27 | } |
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28 | |
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29 | /** |
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30 | * Read an 8 bits memory mapped hardware register |
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31 | */ |
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32 | in_reset static inline unsigned char ioread8(void * addr) |
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33 | { |
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34 | return *(volatile unsigned char *) addr; |
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35 | } |
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36 | |
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37 | /** |
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38 | * Write an 32 bits memory mapped hardware register |
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39 | */ |
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40 | in_reset static inline void iowrite32(void * addr, unsigned int value) |
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41 | { |
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42 | *(volatile unsigned int *) addr = value; |
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43 | asm volatile("sync"); |
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44 | } |
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45 | |
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46 | /** |
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47 | * Write an 16 bits memory mapped hardware register |
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48 | */ |
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49 | in_reset static inline void iowrite16(void * addr, unsigned short value) |
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50 | { |
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51 | *(volatile unsigned short *) addr = value; |
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52 | asm volatile("sync"); |
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53 | } |
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54 | |
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55 | /** |
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56 | * Write an 8 bits memory mapped hardware register |
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57 | */ |
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58 | in_reset static inline void iowrite8(void * addr, unsigned char value) |
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59 | { |
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60 | *(volatile unsigned char *) addr = value; |
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61 | asm volatile("sync"); |
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62 | } |
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63 | |
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64 | #undef in_reset |
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65 | |
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66 | #endif |
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