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1849 | jermar | 1 | /* |
2 | * Copyright (C) 2006 Jakub Jermar |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | /** @addtogroup sparc64 |
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30 | * @{ |
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31 | */ |
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32 | /** |
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33 | * @file |
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34 | * @brief FireHose Controller (FHC) driver. |
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35 | * |
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36 | * Note that this driver is a result of reverse engineering |
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37 | * rather than implementation of a specification. This |
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38 | * is due to the fact that the FHC documentation is not |
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39 | * publicly available. |
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40 | */ |
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41 | |||
42 | #include <arch/drivers/fhc.h> |
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43 | #include <arch/mm/page.h> |
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1909 | jermar | 44 | #include <mm/slab.h> |
1849 | jermar | 45 | #include <arch/types.h> |
46 | #include <typedefs.h> |
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1909 | jermar | 47 | #include <genarch/ofw/ofw_tree.h> |
1849 | jermar | 48 | #include <genarch/kbd/z8530.h> |
49 | |||
1909 | jermar | 50 | fhc_t *central_fhc = NULL; |
1849 | jermar | 51 | |
1909 | jermar | 52 | /** |
53 | * I suspect this must be hardcoded in the FHC. |
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54 | * If it is not, than we can read all IMAP registers |
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55 | * and get the complete mapping. |
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56 | */ |
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57 | #define FHC_UART_INO 0x39 |
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1849 | jermar | 58 | |
59 | #define FHC_UART_IMAP 0x0 |
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60 | #define FHC_UART_ICLR 0x4 |
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61 | |||
1909 | jermar | 62 | #define UART_IMAP_REG 4 |
63 | |||
64 | fhc_t *fhc_init(ofw_tree_node_t *node) |
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1849 | jermar | 65 | { |
1909 | jermar | 66 | fhc_t *fhc; |
67 | ofw_tree_property_t *prop; |
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1849 | jermar | 68 | |
1909 | jermar | 69 | prop = ofw_tree_getprop(node, "reg"); |
70 | |||
71 | if (!prop || !prop->value) |
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72 | return NULL; |
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73 | |||
74 | count_t regs = prop->size / sizeof(ofw_central_reg_t); |
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75 | if (regs + 1 < UART_IMAP_REG) |
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76 | return NULL; |
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77 | |||
78 | ofw_central_reg_t *reg = &((ofw_central_reg_t *) prop->value)[UART_IMAP_REG]; |
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79 | |||
80 | uintptr_t paddr; |
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81 | if (!ofw_central_apply_ranges(node->parent, reg, &paddr)) |
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82 | return NULL; |
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83 | |||
84 | fhc = (fhc_t *) malloc(sizeof(fhc_t), FRAME_ATOMIC); |
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85 | if (!fhc) |
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86 | return NULL; |
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87 | |||
88 | fhc->uart_imap = (uint32_t *) hw_map(paddr, reg->size); |
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89 | |||
90 | return fhc; |
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1849 | jermar | 91 | } |
92 | |||
1909 | jermar | 93 | void fhc_enable_interrupt(fhc_t *fhc, int ino) |
1849 | jermar | 94 | { |
1909 | jermar | 95 | switch (ino) { |
96 | case FHC_UART_INO: |
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97 | fhc->uart_imap[FHC_UART_ICLR] = 0x0; |
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98 | fhc->uart_imap[FHC_UART_IMAP] = 0x80000000; |
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99 | break; |
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100 | default: |
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101 | panic("Unexpected INO (%d)\n", ino); |
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102 | break; |
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103 | } |
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1849 | jermar | 104 | } |
105 | |||
1909 | jermar | 106 | void fhc_clear_interrupt(fhc_t *fhc, int ino) |
107 | { |
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108 | ASSERT(fhc->uart_imap); |
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109 | |||
110 | switch (ino) { |
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111 | case FHC_UART_INO: |
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112 | fhc->uart_imap[FHC_UART_ICLR] = 0; |
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113 | break; |
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114 | default: |
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115 | panic("Unexpected INO (%d)\n", ino); |
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116 | break; |
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117 | } |
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118 | } |
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119 | |||
1849 | jermar | 120 | /** @} |
121 | */ |