1/* 2 * linux/arch/arm/mach-omap1/ams-delta-fiq-handler.S 3 * 4 * Based on linux/arch/arm/lib/floppydma.S 5 * Renamed and modified to work with 2.6 kernel by Matt Callow 6 * Copyright (C) 1995, 1996 Russell King 7 * Copyright (C) 2004 Pete Trapps 8 * Copyright (C) 2006 Matt Callow 9 * Copyright (C) 2010 Janusz Krzysztofik 10 * 11 * This program is free software; you can redistribute it and/or modify it 12 * under the terms of the GNU General Public License version 2 13 * as published by the Free Software Foundation. 14 */ 15 16#include <linux/linkage.h> 17 18#include <plat/io.h> 19#include <plat/board-ams-delta.h> 20 21#include <mach/ams-delta-fiq.h> 22 23/* 24 * GPIO related definitions, copied from arch/arm/plat-omap/gpio.c. 25 * Unfortunately, those were not placed in a separate header file. 26 */ 27#define OMAP1510_GPIO_BASE 0xFFFCE000 28#define OMAP1510_GPIO_DATA_INPUT 0x00 29#define OMAP1510_GPIO_DATA_OUTPUT 0x04 30#define OMAP1510_GPIO_DIR_CONTROL 0x08 31#define OMAP1510_GPIO_INT_CONTROL 0x0c 32#define OMAP1510_GPIO_INT_MASK 0x10 33#define OMAP1510_GPIO_INT_STATUS 0x14 34#define OMAP1510_GPIO_PIN_CONTROL 0x18 35 36/* GPIO register bitmasks */ 37#define KEYBRD_DATA_MASK (0x1 << AMS_DELTA_GPIO_PIN_KEYBRD_DATA) 38#define KEYBRD_CLK_MASK (0x1 << AMS_DELTA_GPIO_PIN_KEYBRD_CLK) 39#define MODEM_IRQ_MASK (0x1 << AMS_DELTA_GPIO_PIN_MODEM_IRQ) 40#define HOOK_SWITCH_MASK (0x1 << AMS_DELTA_GPIO_PIN_HOOK_SWITCH) 41#define OTHERS_MASK (MODEM_IRQ_MASK | HOOK_SWITCH_MASK) 42 43/* IRQ handler register bitmasks */ 44#define DEFERRED_FIQ_MASK (0x1 << (INT_DEFERRED_FIQ % IH2_BASE)) 45#define GPIO_BANK1_MASK (0x1 << INT_GPIO_BANK1) 46 47/* Driver buffer byte offsets */ 48#define BUF_MASK (FIQ_MASK * 4) 49#define BUF_STATE (FIQ_STATE * 4) 50#define BUF_KEYS_CNT (FIQ_KEYS_CNT * 4) 51#define BUF_TAIL_OFFSET (FIQ_TAIL_OFFSET * 4) 52#define BUF_HEAD_OFFSET (FIQ_HEAD_OFFSET * 4) 53#define BUF_BUF_LEN (FIQ_BUF_LEN * 4) 54#define BUF_KEY (FIQ_KEY * 4) 55#define BUF_MISSED_KEYS (FIQ_MISSED_KEYS * 4) 56#define BUF_BUFFER_START (FIQ_BUFFER_START * 4) 57#define BUF_GPIO_INT_MASK (FIQ_GPIO_INT_MASK * 4) 58#define BUF_KEYS_HICNT (FIQ_KEYS_HICNT * 4) 59#define BUF_IRQ_PEND (FIQ_IRQ_PEND * 4) 60#define BUF_SIR_CODE_L1 (FIQ_SIR_CODE_L1 * 4) 61#define BUF_SIR_CODE_L2 (IRQ_SIR_CODE_L2 * 4) 62#define BUF_CNT_INT_00 (FIQ_CNT_INT_00 * 4) 63#define BUF_CNT_INT_KEY (FIQ_CNT_INT_KEY * 4) 64#define BUF_CNT_INT_MDM (FIQ_CNT_INT_MDM * 4) 65#define BUF_CNT_INT_03 (FIQ_CNT_INT_03 * 4) 66#define BUF_CNT_INT_HSW (FIQ_CNT_INT_HSW * 4) 67#define BUF_CNT_INT_05 (FIQ_CNT_INT_05 * 4) 68#define BUF_CNT_INT_06 (FIQ_CNT_INT_06 * 4) 69#define BUF_CNT_INT_07 (FIQ_CNT_INT_07 * 4) 70#define BUF_CNT_INT_08 (FIQ_CNT_INT_08 * 4) 71#define BUF_CNT_INT_09 (FIQ_CNT_INT_09 * 4) 72#define BUF_CNT_INT_10 (FIQ_CNT_INT_10 * 4) 73#define BUF_CNT_INT_11 (FIQ_CNT_INT_11 * 4) 74#define BUF_CNT_INT_12 (FIQ_CNT_INT_12 * 4) 75#define BUF_CNT_INT_13 (FIQ_CNT_INT_13 * 4) 76#define BUF_CNT_INT_14 (FIQ_CNT_INT_14 * 4) 77#define BUF_CNT_INT_15 (FIQ_CNT_INT_15 * 4) 78#define BUF_CIRC_BUFF (FIQ_CIRC_BUFF * 4) 79 80 81/* 82 * Register usage 83 * r8 - temporary 84 * r9 - the driver buffer 85 * r10 - temporary 86 * r11 - interrupts mask 87 * r12 - base pointers 88 * r13 - interrupts status 89 */ 90 91 .text 92 93 .global qwerty_fiqin_end 94 95ENTRY(qwerty_fiqin_start) 96 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 97 @ FIQ intrrupt handler 98 ldr r12, omap_ih1_base @ set pointer to level1 handler 99 100 ldr r11, [r12, #IRQ_MIR_REG_OFFSET] @ fetch interrupts mask 101 102 ldr r13, [r12, #IRQ_ITR_REG_OFFSET] @ fetch interrupts status 103 bics r13, r13, r11 @ clear masked - any left? 104 beq exit @ none - spurious FIQ? exit 105 106 ldr r10, [r12, #IRQ_SIR_FIQ_REG_OFFSET] @ get requested interrupt number 107 108 mov r8, #2 @ reset FIQ agreement 109 str r8, [r12, #IRQ_CONTROL_REG_OFFSET] 110 111 cmp r10, #INT_GPIO_BANK1 @ is it GPIO bank interrupt? 112 beq gpio @ yes - process it 113 114 mov r8, #1 115 orr r8, r11, r8, lsl r10 @ mask spurious interrupt 116 str r8, [r12, #IRQ_MIR_REG_OFFSET] 117exit: 118 subs pc, lr, #4 @ return from FIQ 119 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 120 121 122 @@@@@@@@@@@@@@@@@@@@@@@@@@@ 123gpio: @ GPIO bank interrupt handler 124 ldr r12, omap1510_gpio_base @ set base pointer to GPIO bank 125 126 ldr r11, [r12, #OMAP1510_GPIO_INT_MASK] @ fetch GPIO interrupts mask 127restart: 128 ldr r13, [r12, #OMAP1510_GPIO_INT_STATUS] @ fetch status bits 129 bics r13, r13, r11 @ clear masked - any left? 130 beq exit @ no - spurious interrupt? exit 131 132 orr r11, r11, r13 @ mask all requested interrupts 133 str r11, [r12, #OMAP1510_GPIO_INT_MASK] 134 135 ands r10, r13, #KEYBRD_CLK_MASK @ extract keyboard status - set? 136 beq hksw @ no - try next source 137 138 139 @@@@@@@@@@@@@@@@@@@@@@ 140 @ Keyboard clock FIQ mode interrupt handler 141 @ r10 now contains KEYBRD_CLK_MASK, use it 142 str r10, [r12, #OMAP1510_GPIO_INT_STATUS] @ ack the interrupt 143 bic r11, r11, r10 @ unmask it 144 str r11, [r12, #OMAP1510_GPIO_INT_MASK] 145 146 @ Process keyboard data 147 ldr r8, [r12, #OMAP1510_GPIO_DATA_INPUT] @ fetch GPIO input 148 149 ldr r10, [r9, #BUF_STATE] @ fetch kbd interface state 150 cmp r10, #0 @ are we expecting start bit? 151 bne data @ no - go to data processing 152 153 ands r8, r8, #KEYBRD_DATA_MASK @ check start bit - detected? 154 beq hksw @ no - try next source 155 156 @ r8 contains KEYBRD_DATA_MASK, use it 157 str r8, [r9, #BUF_STATE] @ enter data processing state 158 @ r10 already contains 0, reuse it 159 str r10, [r9, #BUF_KEY] @ clear keycode 160 mov r10, #2 @ reset input bit mask 161 str r10, [r9, #BUF_MASK] 162 163 @ Mask other GPIO line interrupts till key done 164 str r11, [r9, #BUF_GPIO_INT_MASK] @ save mask for later restore 165 mvn r11, #KEYBRD_CLK_MASK @ prepare all except kbd mask 166 str r11, [r12, #OMAP1510_GPIO_INT_MASK] @ store into the mask register 167 168 b restart @ restart 169 170data: ldr r10, [r9, #BUF_MASK] @ fetch current input bit mask 171 172 @ r8 still contains GPIO input bits 173 ands r8, r8, #KEYBRD_DATA_MASK @ is keyboard data line low? 174 ldreq r8, [r9, #BUF_KEY] @ yes - fetch collected so far, 175 orreq r8, r8, r10 @ set 1 at current mask position 176 streq r8, [r9, #BUF_KEY] @ and save back 177 178 mov r10, r10, lsl #1 @ shift mask left 179 bics r10, r10, #0x800 @ have we got all the bits? 180 strne r10, [r9, #BUF_MASK] @ not yet - store the mask 181 bne restart @ and restart 182 183 @ r10 already contains 0, reuse it 184 str r10, [r9, #BUF_STATE] @ reset state to start 185 186 @ Key done - restore interrupt mask 187 ldr r10, [r9, #BUF_GPIO_INT_MASK] @ fetch saved mask 188 and r11, r11, r10 @ unmask all saved as unmasked 189 str r11, [r12, #OMAP1510_GPIO_INT_MASK] @ restore into the mask register 190 191 @ Try appending the keycode to the circular buffer 192 ldr r10, [r9, #BUF_KEYS_CNT] @ get saved keystrokes count 193 ldr r8, [r9, #BUF_BUF_LEN] @ get buffer size 194 cmp r10, r8 @ is buffer full? 195 beq hksw @ yes - key lost, next source 196 197 add r10, r10, #1 @ incremet keystrokes counter 198 str r10, [r9, #BUF_KEYS_CNT] 199 200 ldr r10, [r9, #BUF_TAIL_OFFSET] @ get buffer tail offset 201 @ r8 already contains buffer size 202 cmp r10, r8 @ end of buffer? 203 moveq r10, #0 @ yes - rewind to buffer start 204 205 ldr r12, [r9, #BUF_BUFFER_START] @ get buffer start address 206 add r12, r12, r10, LSL #2 @ calculate buffer tail address 207 ldr r8, [r9, #BUF_KEY] @ get last keycode 208 str r8, [r12] @ append it to the buffer tail 209 210 add r10, r10, #1 @ increment buffer tail offset 211 str r10, [r9, #BUF_TAIL_OFFSET] 212 213 ldr r10, [r9, #BUF_CNT_INT_KEY] @ increment interrupts counter 214 add r10, r10, #1 215 str r10, [r9, #BUF_CNT_INT_KEY] 216 @@@@@@@@@@@@@@@@@@@@@@@@ 217 218 219hksw: @Is hook switch interrupt requested? 220 tst r13, #HOOK_SWITCH_MASK @ is hook switch status bit set? 221 beq mdm @ no - try next source 222 223 224 @@@@@@@@@@@@@@@@@@@@@@@@ 225 @ Hook switch interrupt FIQ mode simple handler 226 227 @ Don't toggle active edge, the switch always bounces 228 229 @ Increment hook switch interrupt counter 230 ldr r10, [r9, #BUF_CNT_INT_HSW] 231 add r10, r10, #1 232 str r10, [r9, #BUF_CNT_INT_HSW] 233 @@@@@@@@@@@@@@@@@@@@@@@@ 234 235 236mdm: @Is it a modem interrupt? 237 tst r13, #MODEM_IRQ_MASK @ is modem status bit set? 238 beq irq @ no - check for next interrupt 239 240 241 @@@@@@@@@@@@@@@@@@@@@@@@ 242 @ Modem FIQ mode interrupt handler stub 243 244 @ Increment modem interrupt counter 245 ldr r10, [r9, #BUF_CNT_INT_MDM] 246 add r10, r10, #1 247 str r10, [r9, #BUF_CNT_INT_MDM] 248 @@@@@@@@@@@@@@@@@@@@@@@@ 249 250 251irq: @ Place deferred_fiq interrupt request 252 ldr r12, deferred_fiq_ih_base @ set pointer to IRQ handler 253 mov r10, #DEFERRED_FIQ_MASK @ set deferred_fiq bit 254 str r10, [r12, #IRQ_ISR_REG_OFFSET] @ place it in the ISR register 255 256 ldr r12, omap1510_gpio_base @ set pointer back to GPIO bank 257 b restart @ check for next GPIO interrupt 258 @@@@@@@@@@@@@@@@@@@@@@@@@@@ 259 260 261/* 262 * Virtual addresses for IO 263 */ 264omap_ih1_base: 265 .word OMAP1_IO_ADDRESS(OMAP_IH1_BASE) 266deferred_fiq_ih_base: 267 .word OMAP1_IO_ADDRESS(DEFERRED_FIQ_IH_BASE) 268omap1510_gpio_base: 269 .word OMAP1_IO_ADDRESS(OMAP1510_GPIO_BASE) 270qwerty_fiqin_end: 271 272/* 273 * Check the size of the FIQ, 274 * it cannot go beyond 0xffff0200, and is copied to 0xffff001c 275 */ 276.if (qwerty_fiqin_end - qwerty_fiqin_start) > (0x200 - 0x1c) 277 .err 278.endif 279