1 | /* |
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2 | * Clock device driver for Lattice Mico32 (lm32). |
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3 | */ |
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4 | |
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5 | /* |
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6 | * COPYRIGHT (c) 1989-2009. |
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7 | * On-Line Applications Research Corporation (OAR). |
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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.org/license/LICENSE. |
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12 | * |
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13 | * Jukka Pietarinen <jukka.pietarinen@mrf.fi>, 2008, |
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14 | * Micro-Research Finland Oy |
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15 | */ |
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16 | |
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17 | #include <bsp.h> |
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18 | #include "../include/system_conf.h" |
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19 | #include "clock.h" |
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20 | #include "bspopts.h" |
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21 | |
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22 | #if LM32_ON_SIMULATOR |
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23 | #define CLOCK_DRIVER_USE_FAST_IDLE 1 |
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24 | #endif |
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25 | |
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26 | static inline int clockread(unsigned int reg) |
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27 | { |
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28 | return *((int*)(TIMER0_BASE_ADDRESS + reg)); |
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29 | } |
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30 | |
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31 | static inline void clockwrite(unsigned int reg, int value) |
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32 | { |
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33 | *((int*)(TIMER0_BASE_ADDRESS + reg)) = value; |
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34 | } |
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35 | |
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36 | /* |
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37 | * The interrupt vector number associated with the clock tick device |
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38 | * driver. |
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39 | */ |
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40 | #define CLOCK_VECTOR ( TIMER0_IRQ ) |
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41 | #define CLOCK_IRQMASK ( 1 << CLOCK_VECTOR ) |
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42 | |
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43 | #define Clock_driver_support_at_tick() \ |
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44 | do { \ |
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45 | /* Clear overflow flag */ \ |
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46 | clockwrite(LM32_CLOCK_SR, 0); \ |
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47 | lm32_interrupt_ack(CLOCK_IRQMASK); \ |
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48 | } while (0) |
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49 | |
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50 | #define Clock_driver_support_install_isr(_new, _old ) \ |
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51 | do { \ |
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52 | _old = (rtems_isr_entry) set_vector( _new, CLOCK_VECTOR, 1 ); \ |
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53 | } while (0) |
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54 | |
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55 | static void Clock_driver_support_initialize_hardware(void) |
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56 | { |
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57 | /* Set clock period */ |
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58 | clockwrite(LM32_CLOCK_PERIOD, |
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59 | (CPU_FREQUENCY / |
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60 | (1000000 / rtems_configuration_get_microseconds_per_tick()))); |
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61 | |
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62 | /* Enable clock interrupts and start in continuous mode */ |
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63 | clockwrite(LM32_CLOCK_CR, LM32_CLOCK_CR_ITO | |
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64 | LM32_CLOCK_CR_CONT | |
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65 | LM32_CLOCK_CR_START); |
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66 | |
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67 | lm32_interrupt_unmask(CLOCK_IRQMASK); |
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68 | } |
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69 | |
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70 | #define Clock_driver_support_shutdown_hardware() \ |
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71 | do { \ |
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72 | /* Disable clock interrupts and stop */ \ |
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73 | lm32_interrupt_unmask(CLOCK_IRQMASK); \ |
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74 | clockwrite(LM32_CLOCK_CR, LM32_CLOCK_CR_STOP); \ |
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75 | } while (0) |
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76 | |
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77 | #define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER |
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78 | |
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79 | #include "../../../shared/clockdrv_shell.h" |
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80 | |
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