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2215 | kebrt | 1 | /* |
2263 | kebrt | 2 | * Copyright (c) 2007 Michal Kebrt, Petr Stepan |
2215 | kebrt | 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 arm32 |
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30 | * @{ |
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31 | */ |
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32 | /** @file |
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33 | */ |
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34 | |||
35 | #include <interrupt.h> |
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36 | #include <ipc/irq.h> |
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37 | #include <console/chardev.h> |
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38 | #include <arch/drivers/gxemul.h> |
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39 | #include <console/console.h> |
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40 | #include <sysinfo/sysinfo.h> |
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41 | #include <print.h> |
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2245 | stepan | 42 | #include <ddi/device.h> |
2263 | kebrt | 43 | #include <mm/page.h> |
2215 | kebrt | 44 | |
45 | /** Address of devices. */ |
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2263 | kebrt | 46 | #define GXEMUL_VIDEORAM 0x10000000 |
47 | #define GXEMUL_KBD 0x10000000 |
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48 | #define GXEMUL_RTC 0x15000000 |
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49 | #define GXEMUL_RTC_FREQ_OFFSET 0x100 |
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50 | #define GXEMUL_RTC_ACK_OFFSET 0x110 |
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51 | #define GXEMUL_IRQC 0x16000000 |
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52 | #define GXEMUL_IRQC_MASK_OFFSET 0x4 |
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53 | #define GXEMUL_IRQC_UNMASK_OFFSET 0x8 |
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54 | #define GXEMUL_MP 0x11000000 |
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55 | #define GXEMUL_MP_MEMSIZE_OFFSET 0x0090 |
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2215 | kebrt | 56 | |
2263 | kebrt | 57 | |
2245 | stepan | 58 | /** IRQs */ |
59 | #define GXEMUL_KBD_IRQ 2 |
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60 | #define GXEMUL_TIMER_IRQ 4 |
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61 | |||
2263 | kebrt | 62 | static gxemul_hw_map_t gxemul_hw_map; |
2215 | kebrt | 63 | static chardev_t console; |
64 | static irq_t gxemul_irq; |
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2245 | stepan | 65 | static irq_t gxemul_timer_irq; |
2215 | kebrt | 66 | |
67 | static void gxemul_write(chardev_t *dev, const char ch); |
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68 | static void gxemul_enable(chardev_t *dev); |
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69 | static void gxemul_disable(chardev_t *dev); |
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70 | static char gxemul_do_read(chardev_t *dev); |
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71 | |||
72 | static chardev_operations_t gxemul_ops = { |
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73 | .resume = gxemul_enable, |
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74 | .suspend = gxemul_disable, |
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75 | .write = gxemul_write, |
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76 | .read = gxemul_do_read, |
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77 | }; |
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78 | |||
2263 | kebrt | 79 | |
80 | /** Initializes #gxemul_hw_map. */ |
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81 | void gxemul_hw_map_init(void) |
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82 | { |
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83 | gxemul_hw_map.videoram = hw_map(GXEMUL_VIDEORAM, PAGE_SIZE); |
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84 | gxemul_hw_map.kbd = hw_map(GXEMUL_KBD, PAGE_SIZE); |
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85 | gxemul_hw_map.rtc = hw_map(GXEMUL_RTC, PAGE_SIZE); |
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86 | gxemul_hw_map.irqc = hw_map(GXEMUL_IRQC, PAGE_SIZE); |
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87 | |||
88 | gxemul_hw_map.rtc_freq = gxemul_hw_map.rtc + GXEMUL_RTC_FREQ_OFFSET; |
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89 | gxemul_hw_map.rtc_ack = gxemul_hw_map.rtc + GXEMUL_RTC_ACK_OFFSET; |
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90 | gxemul_hw_map.irqc_mask = gxemul_hw_map.irqc + GXEMUL_IRQC_MASK_OFFSET; |
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91 | gxemul_hw_map.irqc_unmask = gxemul_hw_map.irqc + GXEMUL_IRQC_UNMASK_OFFSET; |
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92 | } |
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93 | |||
2215 | kebrt | 94 | /** Putchar that works with gxemul */ |
95 | void gxemul_write(chardev_t *dev, const char ch) |
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96 | { |
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2263 | kebrt | 97 | *((char *) gxemul_hw_map.videoram) = ch; |
2215 | kebrt | 98 | } |
99 | |||
100 | /* Called from getc(). */ |
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101 | void gxemul_enable(chardev_t *dev) |
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102 | { |
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103 | // cp0_unmask_int(GXEMUL_KBD_IRQ); |
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2245 | stepan | 104 | gxemul_irqc_unmask(GXEMUL_KBD_IRQ); |
2215 | kebrt | 105 | } |
106 | |||
107 | /* Called from getc(). */ |
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108 | void gxemul_disable(chardev_t *dev) |
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109 | { |
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110 | // cp0_mask_int(GXEMUL_KBD_IRQ); |
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2245 | stepan | 111 | gxemul_irqc_mask(GXEMUL_KBD_IRQ); |
2215 | kebrt | 112 | } |
113 | |||
114 | /** Read character using polling, assume interrupts disabled */ |
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115 | static char gxemul_do_read(chardev_t *dev) |
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116 | { |
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117 | char ch; |
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118 | |||
119 | while (1) { |
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2263 | kebrt | 120 | ch = *((volatile char *) gxemul_hw_map.kbd); |
2215 | kebrt | 121 | if (ch) { |
122 | if (ch == '\r') |
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123 | return '\n'; |
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124 | if (ch == 0x7f) |
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125 | return '\b'; |
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126 | return ch; |
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127 | } |
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128 | } |
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129 | } |
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130 | |||
131 | /** Process keyboard interrupt. */ |
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132 | static void gxemul_irq_handler(irq_t *irq, void *arg, ...) |
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133 | { |
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134 | if ((irq->notif_cfg.notify) && (irq->notif_cfg.answerbox)) |
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135 | ipc_irq_send_notif(irq); |
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136 | else { |
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137 | char ch = 0; |
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138 | |||
2263 | kebrt | 139 | ch = *((char *) gxemul_hw_map.kbd); |
2215 | kebrt | 140 | if (ch =='\r') |
141 | ch = '\n'; |
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142 | if (ch == 0x7f) |
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143 | ch = '\b'; |
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2245 | stepan | 144 | //chardev_push_character(&console, ch); |
145 | printf("%c", ch); |
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2215 | kebrt | 146 | } |
147 | } |
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148 | |||
149 | static irq_ownership_t gxemul_claim(void) |
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150 | { |
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151 | return IRQ_ACCEPT; |
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152 | } |
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153 | |||
154 | void gxemul_kbd_grab(void) |
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155 | { |
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156 | ipl_t ipl = interrupts_disable(); |
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2263 | kebrt | 157 | spinlock_lock(&gxemul_irq.lock); |
2215 | kebrt | 158 | gxemul_irq.notif_cfg.notify = false; |
159 | spinlock_unlock(&gxemul_irq.lock); |
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160 | interrupts_restore(ipl); |
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161 | } |
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162 | |||
163 | void gxemul_kbd_release(void) |
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164 | { |
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165 | ipl_t ipl = interrupts_disable(); |
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166 | spinlock_lock(&gxemul_irq.lock); |
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167 | if (gxemul_irq.notif_cfg.answerbox) |
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168 | gxemul_irq.notif_cfg.notify = true; |
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169 | spinlock_unlock(&gxemul_irq.lock); |
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170 | interrupts_restore(ipl); |
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171 | } |
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172 | |||
173 | |||
2263 | kebrt | 174 | /** Return console object representing gxemul console */ |
2215 | kebrt | 175 | void gxemul_console(devno_t devno) |
176 | { |
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2263 | kebrt | 177 | chardev_initialize("gxemul_console", &console, &gxemul_ops); |
2215 | kebrt | 178 | stdin = &console; |
179 | stdout = &console; |
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180 | |||
181 | irq_initialize(&gxemul_irq); |
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182 | gxemul_irq.devno = devno; |
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183 | gxemul_irq.inr = GXEMUL_KBD_IRQ; |
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184 | gxemul_irq.claim = gxemul_claim; |
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185 | gxemul_irq.handler = gxemul_irq_handler; |
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186 | irq_register(&gxemul_irq); |
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187 | |||
188 | // cp0_unmask_int(GXEMUL_KBD_IRQ); |
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2245 | stepan | 189 | gxemul_irqc_unmask(GXEMUL_KBD_IRQ); |
2215 | kebrt | 190 | |
191 | sysinfo_set_item_val("kbd", NULL, true); |
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192 | sysinfo_set_item_val("kbd.devno", NULL, devno); |
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193 | sysinfo_set_item_val("kbd.inr", NULL, GXEMUL_KBD_IRQ); |
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2263 | kebrt | 194 | sysinfo_set_item_val("kbd.address.virtual", NULL, gxemul_hw_map.kbd); |
2215 | kebrt | 195 | } |
196 | |||
2245 | stepan | 197 | /** Return the mask of active interrupts. */ |
198 | inline uint32_t gxemul_irqc_get_sources(void) |
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199 | { |
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2263 | kebrt | 200 | return *(uint32_t*) gxemul_hw_map.irqc; |
2245 | stepan | 201 | } |
202 | |||
203 | /** Masks interrupt. |
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204 | * |
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205 | * @param irq interrupt number |
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206 | */ |
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207 | inline void gxemul_irqc_mask(uint32_t irq) |
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208 | { |
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2263 | kebrt | 209 | *(uint32_t*) gxemul_hw_map.irqc_mask = irq; |
2245 | stepan | 210 | } |
211 | |||
212 | /** Unmasks interrupt. |
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213 | * |
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214 | * @param irq interrupt number |
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215 | */ |
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216 | inline void gxemul_irqc_unmask(uint32_t irq) |
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217 | { |
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2263 | kebrt | 218 | *(uint32_t*) gxemul_hw_map.irqc_unmask = irq; |
2245 | stepan | 219 | } |
220 | |||
221 | |||
222 | /** Starts gxemul Real Time Clock device, which asserts regular interrupts. |
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223 | * |
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224 | * @param frequency interrupts frequency (0 disables RTC) |
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225 | */ |
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226 | void gxemul_timer_start(uint32_t frequency) |
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227 | { |
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2263 | kebrt | 228 | *(uint32_t*) gxemul_hw_map.rtc_freq = frequency; |
2245 | stepan | 229 | } |
230 | |||
231 | static irq_ownership_t gxemul_timer_claim(void) |
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232 | { |
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233 | return IRQ_ACCEPT; |
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234 | } |
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235 | |||
236 | static void gxemul_timer_irq_handler(irq_t *irq, void *arg, ...) |
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237 | { |
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238 | /* TODO time drifts ?? |
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239 | unsigned long drift; |
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240 | |||
241 | drift = cp0_count_read() - nextcount; |
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242 | while (drift > cp0_compare_value) { |
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243 | drift -= cp0_compare_value; |
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244 | CPU->missed_clock_ticks++; |
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245 | } |
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246 | nextcount = cp0_count_read() + cp0_compare_value - drift; |
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247 | cp0_compare_write(nextcount); |
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248 | */ |
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249 | |||
250 | /* |
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251 | * We are holding a lock which prevents preemption. |
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252 | * Release the lock, call clock() and reacquire the lock again. |
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253 | */ |
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254 | spinlock_unlock(&irq->lock); |
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255 | //clock(); |
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256 | puts(" "); |
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257 | spinlock_lock(&irq->lock); |
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2261 | stepan | 258 | |
259 | /* acknowledge tick */ |
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2263 | kebrt | 260 | *(uint32_t*) gxemul_hw_map.rtc_ack = 0; |
2245 | stepan | 261 | |
262 | /* TODO what's that? * |
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263 | if (virtual_timer_fnc != NULL) |
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264 | virtual_timer_fnc(); |
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265 | */ |
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266 | } |
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267 | |||
268 | /** |
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269 | * Initializes and registers timer interrupt handler. |
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270 | */ |
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271 | void gxemul_timer_irq_init() |
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272 | { |
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273 | irq_initialize(&gxemul_timer_irq); |
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274 | gxemul_timer_irq.devno = device_assign_devno(); |
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275 | gxemul_timer_irq.inr = GXEMUL_TIMER_IRQ; |
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276 | gxemul_timer_irq.claim = gxemul_timer_claim; |
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277 | gxemul_timer_irq.handler = gxemul_timer_irq_handler; |
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2261 | stepan | 278 | |
2245 | stepan | 279 | irq_register(&gxemul_timer_irq); |
280 | } |
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281 | |||
2263 | kebrt | 282 | size_t gxemul_get_memory_size(void) |
283 | { |
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284 | return *((int*)(GXEMUL_MP + GXEMUL_MP_MEMSIZE_OFFSET)); |
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285 | } |
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2245 | stepan | 286 | |
2215 | kebrt | 287 | /** @} |
288 | */ |