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| 3924 | svoboda | 1 | /* |
| 2 | * Copyright (c) 2008 Pavel Rimsky |
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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 kbd_port |
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| 30 | * @ingroup kbd |
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| 31 | * @{ |
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| 32 | */ |
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| 33 | /** @file |
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| 34 | * @brief SGCN (Serengeti Console) keyboard port driver. |
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| 35 | */ |
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| 36 | |||
| 37 | #include <as.h> |
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| 38 | #include <ddi.h> |
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| 39 | #include <ipc/ipc.h> |
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| 40 | #include <async.h> |
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| 41 | #include <kbd.h> |
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| 42 | #include <kbd_port.h> |
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| 43 | #include <sysinfo.h> |
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| 44 | #include <stdio.h> |
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| 45 | |||
| 46 | /** |
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| 47 | * SGCN buffer header. It is placed at the very beginning of the SGCN |
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| 48 | * buffer. |
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| 49 | */ |
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| 50 | typedef struct { |
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| 51 | /** hard-wired to "CON" */ |
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| 52 | char magic[4]; |
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| 53 | |||
| 54 | /** we don't need this */ |
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| 55 | char unused[8]; |
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| 56 | |||
| 57 | /** offset within the SGCN buffer of the input buffer start */ |
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| 58 | uint32_t in_begin; |
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| 59 | |||
| 60 | /** offset within the SGCN buffer of the input buffer end */ |
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| 61 | uint32_t in_end; |
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| 62 | |||
| 63 | /** offset within the SGCN buffer of the input buffer read pointer */ |
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| 64 | uint32_t in_rdptr; |
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| 65 | |||
| 66 | /** offset within the SGCN buffer of the input buffer write pointer */ |
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| 67 | uint32_t in_wrptr; |
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| 68 | } __attribute__ ((packed)) sgcn_buffer_header_t; |
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| 69 | |||
| 70 | /* |
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| 71 | * Returns a pointer to the object of a given type which is placed at the given |
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| 72 | * offset from the console buffer beginning. |
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| 73 | */ |
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| 74 | #define SGCN_BUFFER(type, offset) \ |
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| 75 | ((type *) (sram_virt_addr + sram_buffer_offset + (offset))) |
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| 76 | |||
| 77 | /** Returns a pointer to the console buffer header. */ |
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| 78 | #define SGCN_BUFFER_HEADER (SGCN_BUFFER(sgcn_buffer_header_t, 0)) |
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| 79 | |||
| 80 | /** |
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| 81 | * Virtual address mapped to SRAM. |
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| 82 | */ |
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| 83 | static uintptr_t sram_virt_addr; |
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| 84 | |||
| 85 | /** |
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| 86 | * SGCN buffer offset within SGCN. |
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| 87 | */ |
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| 88 | static uintptr_t sram_buffer_offset; |
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| 89 | |||
| 90 | static void sgcn_irq_handler(ipc_callid_t iid, ipc_call_t *call); |
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| 91 | |||
| 92 | |||
| 93 | /** |
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| 94 | * Initializes the SGCN driver. |
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| 95 | * Maps the physical memory (SRAM) and registers the interrupt. |
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| 96 | */ |
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| 97 | int kbd_port_init(void) |
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| 98 | { |
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| 99 | async_set_interrupt_received(sgcn_irq_handler); |
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| 100 | sram_virt_addr = (uintptr_t) as_get_mappable_page(sysinfo_value("sram.area.size")); |
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| 101 | if (physmem_map((void *) sysinfo_value("sram.address.physical"), |
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| 102 | (void *) sram_virt_addr, sysinfo_value("sram.area.size") / PAGE_SIZE, |
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| 103 | AS_AREA_READ | AS_AREA_WRITE) != 0) { |
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| 104 | printf("SGCN: uspace driver could not map physical memory."); |
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| 105 | return -1; |
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| 106 | } |
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| 107 | |||
| 108 | sram_buffer_offset = sysinfo_value("sram.buffer.offset"); |
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| 109 | ipc_register_irq(sysinfo_value("kbd.inr"), sysinfo_value("kbd.devno"), |
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| 110 | 0, (void *) 0); |
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| 111 | return 0; |
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| 112 | } |
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| 113 | |||
| 114 | /** |
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| 115 | * Handler of the "key pressed" event. Reads codes of all the pressed keys from |
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| 116 | * the buffer. |
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| 117 | */ |
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| 118 | static void sgcn_irq_handler(ipc_callid_t iid, ipc_call_t *call) |
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| 119 | { |
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| 120 | char c; |
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| 121 | |||
| 122 | uint32_t begin = SGCN_BUFFER_HEADER->in_begin; |
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| 123 | uint32_t end = SGCN_BUFFER_HEADER->in_end; |
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| 124 | uint32_t size = end - begin; |
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| 125 | |||
| 126 | volatile char *buf_ptr = (volatile char *) |
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| 127 | SGCN_BUFFER(char, SGCN_BUFFER_HEADER->in_rdptr); |
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| 128 | volatile uint32_t *in_wrptr_ptr = &(SGCN_BUFFER_HEADER->in_wrptr); |
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| 129 | volatile uint32_t *in_rdptr_ptr = &(SGCN_BUFFER_HEADER->in_rdptr); |
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| 130 | |||
| 131 | while (*in_rdptr_ptr != *in_wrptr_ptr) { |
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| 132 | c = *buf_ptr; |
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| 133 | *in_rdptr_ptr = (((*in_rdptr_ptr) - begin + 1) % size) + begin; |
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| 134 | buf_ptr = (volatile char *) |
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| 135 | SGCN_BUFFER(char, SGCN_BUFFER_HEADER->in_rdptr); |
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| 136 | kbd_push_scancode(c); |
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| 137 | } |
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| 138 | } |
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| 139 | |||
| 140 | /** @} |
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| 141 | */ |