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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1849 | jermar | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2006 Jakub Jermar |
| 1849 | jermar | 3 | * All rights reserved. |
| 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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| 1946 | jermar | 43 | #include <arch/trap/interrupt.h> |
| 2089 | decky | 44 | #include <mm/page.h> |
| 1909 | jermar | 45 | #include <mm/slab.h> |
| 1849 | jermar | 46 | #include <arch/types.h> |
| 1909 | jermar | 47 | #include <genarch/ofw/ofw_tree.h> |
| 1849 | jermar | 48 | |
| 1909 | jermar | 49 | fhc_t *central_fhc = NULL; |
| 1849 | jermar | 50 | |
| 1909 | jermar | 51 | /** |
| 52 | * I suspect this must be hardcoded in the FHC. |
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| 53 | * If it is not, than we can read all IMAP registers |
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| 54 | * and get the complete mapping. |
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| 55 | */ |
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| 1910 | jermar | 56 | #define FHC_UART_INR 0x39 |
| 1849 | jermar | 57 | |
| 58 | #define FHC_UART_IMAP 0x0 |
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| 59 | #define FHC_UART_ICLR 0x4 |
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| 60 | |||
| 1909 | jermar | 61 | #define UART_IMAP_REG 4 |
| 62 | |||
| 63 | fhc_t *fhc_init(ofw_tree_node_t *node) |
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| 1849 | jermar | 64 | { |
| 1909 | jermar | 65 | fhc_t *fhc; |
| 66 | ofw_tree_property_t *prop; |
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| 1849 | jermar | 67 | |
| 1909 | jermar | 68 | prop = ofw_tree_getprop(node, "reg"); |
| 69 | |||
| 70 | if (!prop || !prop->value) |
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| 71 | return NULL; |
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| 72 | |||
| 73 | count_t regs = prop->size / sizeof(ofw_central_reg_t); |
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| 74 | if (regs + 1 < UART_IMAP_REG) |
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| 75 | return NULL; |
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| 76 | |||
| 77 | ofw_central_reg_t *reg = &((ofw_central_reg_t *) prop->value)[UART_IMAP_REG]; |
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| 78 | |||
| 79 | uintptr_t paddr; |
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| 80 | if (!ofw_central_apply_ranges(node->parent, reg, &paddr)) |
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| 81 | return NULL; |
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| 82 | |||
| 83 | fhc = (fhc_t *) malloc(sizeof(fhc_t), FRAME_ATOMIC); |
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| 84 | if (!fhc) |
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| 85 | return NULL; |
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| 86 | |||
| 87 | fhc->uart_imap = (uint32_t *) hw_map(paddr, reg->size); |
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| 88 | |||
| 89 | return fhc; |
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| 1849 | jermar | 90 | } |
| 91 | |||
| 1910 | jermar | 92 | void fhc_enable_interrupt(fhc_t *fhc, int inr) |
| 1849 | jermar | 93 | { |
| 1910 | jermar | 94 | switch (inr) { |
| 95 | case FHC_UART_INR: |
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| 1946 | jermar | 96 | fhc->uart_imap[FHC_UART_IMAP] |= IMAP_V_MASK; |
| 1909 | jermar | 97 | break; |
| 98 | default: |
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| 1910 | jermar | 99 | panic("Unexpected INR (%d)\n", inr); |
| 1909 | jermar | 100 | break; |
| 101 | } |
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| 1849 | jermar | 102 | } |
| 103 | |||
| 3665 | rimsky | 104 | void fhc_clear_interrupt(void *fhcp, int inr) |
| 1909 | jermar | 105 | { |
| 3665 | rimsky | 106 | fhc_t *fhc = (fhc_t *)fhcp; |
| 1909 | jermar | 107 | ASSERT(fhc->uart_imap); |
| 108 | |||
| 1910 | jermar | 109 | switch (inr) { |
| 110 | case FHC_UART_INR: |
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| 1909 | jermar | 111 | fhc->uart_imap[FHC_UART_ICLR] = 0; |
| 112 | break; |
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| 113 | default: |
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| 1910 | jermar | 114 | panic("Unexpected INR (%d)\n", inr); |
| 1909 | jermar | 115 | break; |
| 116 | } |
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| 117 | } |
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| 118 | |||
| 1849 | jermar | 119 | /** @} |
| 120 | */ |