1 | /* |
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2 | * Copyright (c) 2017 embedded brains GmbH. All rights reserved. |
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3 | * |
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4 | * embedded brains GmbH |
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5 | * Dornierstr. 4 |
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6 | * 82178 Puchheim |
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7 | * Germany |
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8 | * <info@embedded-brains.de> |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.rtems.org/license/LICENSE. |
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13 | */ |
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14 | |
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15 | #include <bsp.h> |
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16 | #include <bsp/bootcard.h> |
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17 | #include <bsp/fatal.h> |
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18 | #include <bsp/fdt.h> |
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19 | #include <bsp/irq-generic.h> |
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20 | #include <bsp/linker-symbols.h> |
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21 | |
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22 | #include <libfdt.h> |
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23 | |
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24 | #define MAGIC_IRQ_OFFSET 32 |
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25 | |
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26 | void *imx_get_reg_of_node(const void *fdt, int node) |
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27 | { |
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28 | int len; |
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29 | const uint32_t *val; |
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30 | |
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31 | val = fdt_getprop(fdt, node, "reg", &len); |
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32 | if (val == NULL || len < 4) { |
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33 | return NULL; |
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34 | } |
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35 | |
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36 | return (void *) fdt32_to_cpu(val[0]); |
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37 | } |
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38 | |
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39 | rtems_vector_number imx_get_irq_of_node( |
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40 | const void *fdt, |
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41 | int node, |
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42 | size_t index |
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43 | ) |
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44 | { |
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45 | int len; |
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46 | const uint32_t *val; |
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47 | |
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48 | val = fdt_getprop(fdt, node, "interrupts", &len); |
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49 | if (val == NULL || len < (int) ((index + 1) * 12)) { |
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50 | return UINT32_MAX; |
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51 | } |
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52 | |
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53 | return fdt32_to_cpu(val[index * 3 + 1]) + MAGIC_IRQ_OFFSET; |
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54 | } |
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55 | |
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56 | uint32_t bsp_fdt_map_intr(const uint32_t *intr, size_t icells) |
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57 | { |
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58 | return intr[1] + MAGIC_IRQ_OFFSET; |
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59 | } |
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60 | |
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61 | void arm_generic_timer_get_config( |
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62 | uint32_t *frequency, |
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63 | uint32_t *irq |
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64 | ) |
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65 | { |
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66 | const void *fdt; |
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67 | int node; |
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68 | int len; |
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69 | const uint32_t *val; |
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70 | |
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71 | fdt = bsp_fdt_get(); |
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72 | node = fdt_path_offset(fdt, "/timer"); |
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73 | |
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74 | val = fdt_getprop(fdt, node, "clock-frequency", &len); |
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75 | if (val != NULL && len >= 4) { |
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76 | *frequency = fdt32_to_cpu(val[0]); |
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77 | } else { |
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78 | bsp_fatal(IMX_FATAL_GENERIC_TIMER_FREQUENCY); |
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79 | } |
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80 | |
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81 | /* FIXME: Figure out how Linux gets a proper IRQ number */ |
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82 | *irq = imx_get_irq_of_node(fdt, node, 0) - 16; |
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83 | } |
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84 | |
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85 | uintptr_t imx_gic_dist_base; |
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86 | |
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87 | static void imx_find_gic(const void *fdt) |
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88 | { |
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89 | int node; |
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90 | |
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91 | node = fdt_path_offset(fdt, "/interrupt-controller"); |
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92 | if (node < 0) { |
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93 | node = fdt_path_offset(fdt, "/soc/interrupt-controller"); |
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94 | } |
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95 | imx_gic_dist_base = (uintptr_t) imx_get_reg_of_node(fdt, node); |
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96 | } |
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97 | |
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98 | void bsp_start(void) |
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99 | { |
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100 | imx_find_gic(bsp_fdt_get()); |
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101 | bsp_interrupt_initialize(); |
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102 | rtems_cache_coherent_add_area( |
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103 | bsp_section_nocacheheap_begin, |
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104 | (uintptr_t) bsp_section_nocacheheap_size |
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105 | ); |
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106 | } |
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