--- /dev/null
+/*
+ * linux/arch/arm/mach-omap1/ams-delta-fiq-handler.S
+ *
+ * Based on linux/arch/arm/lib/floppydma.S
+ * Renamed and modified to work with 2.6 kernel by Matt Callow
+ * Copyright (C) 1995, 1996 Russell King
+ * Copyright (C) 2004 Pete Trapps
+ * Copyright (C) 2006 Matt Callow
+ * Copyright (C) 2010 Janusz Krzysztofik
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ */
+
+#include <linux/linkage.h>
+
+#include <plat/io.h>
+#include <plat/board-ams-delta.h>
+
+#include <mach/ams-delta-fiq.h>
+
+/*
+ * GPIO related definitions, copied from arch/arm/plat-omap/gpio.c.
+ * Unfortunately, those were not placed in a separate header file.
+ */
+#define OMAP1510_GPIO_BASE 0xFFFCE000
+#define OMAP1510_GPIO_DATA_INPUT 0x00
+#define OMAP1510_GPIO_DATA_OUTPUT 0x04
+#define OMAP1510_GPIO_DIR_CONTROL 0x08
+#define OMAP1510_GPIO_INT_CONTROL 0x0c
+#define OMAP1510_GPIO_INT_MASK 0x10
+#define OMAP1510_GPIO_INT_STATUS 0x14
+#define OMAP1510_GPIO_PIN_CONTROL 0x18
+
+/* GPIO register bitmasks */
+#define KEYBRD_DATA_MASK (0x1 << AMS_DELTA_GPIO_PIN_KEYBRD_DATA)
+#define KEYBRD_CLK_MASK (0x1 << AMS_DELTA_GPIO_PIN_KEYBRD_CLK)
+#define MODEM_IRQ_MASK (0x1 << AMS_DELTA_GPIO_PIN_MODEM_IRQ)
+#define HOOK_SWITCH_MASK (0x1 << AMS_DELTA_GPIO_PIN_HOOK_SWITCH)
+#define OTHERS_MASK (MODEM_IRQ_MASK | HOOK_SWITCH_MASK)
+
+/* IRQ handler register bitmasks */
+#define DEFERRED_FIQ_MASK (0x1 << (INT_DEFERRED_FIQ % IH2_BASE))
+#define GPIO_BANK1_MASK (0x1 << INT_GPIO_BANK1)
+
+/* Driver buffer byte offsets */
+#define BUF_MASK (FIQ_MASK * 4)
+#define BUF_STATE (FIQ_STATE * 4)
+#define BUF_KEYS_CNT (FIQ_KEYS_CNT * 4)
+#define BUF_TAIL_OFFSET (FIQ_TAIL_OFFSET * 4)
+#define BUF_HEAD_OFFSET (FIQ_HEAD_OFFSET * 4)
+#define BUF_BUF_LEN (FIQ_BUF_LEN * 4)
+#define BUF_KEY (FIQ_KEY * 4)
+#define BUF_MISSED_KEYS (FIQ_MISSED_KEYS * 4)
+#define BUF_BUFFER_START (FIQ_BUFFER_START * 4)
+#define BUF_GPIO_INT_MASK (FIQ_GPIO_INT_MASK * 4)
+#define BUF_KEYS_HICNT (FIQ_KEYS_HICNT * 4)
+#define BUF_IRQ_PEND (FIQ_IRQ_PEND * 4)
+#define BUF_SIR_CODE_L1 (FIQ_SIR_CODE_L1 * 4)
+#define BUF_SIR_CODE_L2 (IRQ_SIR_CODE_L2 * 4)
+#define BUF_CNT_INT_00 (FIQ_CNT_INT_00 * 4)
+#define BUF_CNT_INT_KEY (FIQ_CNT_INT_KEY * 4)
+#define BUF_CNT_INT_MDM (FIQ_CNT_INT_MDM * 4)
+#define BUF_CNT_INT_03 (FIQ_CNT_INT_03 * 4)
+#define BUF_CNT_INT_HSW (FIQ_CNT_INT_HSW * 4)
+#define BUF_CNT_INT_05 (FIQ_CNT_INT_05 * 4)
+#define BUF_CNT_INT_06 (FIQ_CNT_INT_06 * 4)
+#define BUF_CNT_INT_07 (FIQ_CNT_INT_07 * 4)
+#define BUF_CNT_INT_08 (FIQ_CNT_INT_08 * 4)
+#define BUF_CNT_INT_09 (FIQ_CNT_INT_09 * 4)
+#define BUF_CNT_INT_10 (FIQ_CNT_INT_10 * 4)
+#define BUF_CNT_INT_11 (FIQ_CNT_INT_11 * 4)
+#define BUF_CNT_INT_12 (FIQ_CNT_INT_12 * 4)
+#define BUF_CNT_INT_13 (FIQ_CNT_INT_13 * 4)
+#define BUF_CNT_INT_14 (FIQ_CNT_INT_14 * 4)
+#define BUF_CNT_INT_15 (FIQ_CNT_INT_15 * 4)
+#define BUF_CIRC_BUFF (FIQ_CIRC_BUFF * 4)
+
+
+/*
+ * Register useage
+ * r8 - temporary
+ * r9 - the driver buffer
+ * r10 - temporary
+ * r11 - interrupts mask
+ * r12 - base pointers
+ * r13 - interrupts status
+ */
+
+ .text
+
+ .global qwerty_fiqin_end
+
+ENTRY(qwerty_fiqin_start)
+ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+ @ FIQ intrrupt handler
+ ldr r12, omap_ih1_base @ set pointer to level1 handler
+
+ ldr r11, [r12, #IRQ_MIR_REG_OFFSET] @ fetch interrupts mask
+
+ ldr r13, [r12, #IRQ_ITR_REG_OFFSET] @ fetch interrupts status
+ bics r13, r13, r11 @ clear masked - any left?
+ beq exit @ none - spurious FIQ? exit
+
+ ldr r10, [r12, #IRQ_SIR_FIQ_REG_OFFSET] @ get requested interrupt number
+
+ mov r8, #2 @ reset FIQ agreement
+ str r8, [r12, #IRQ_CONTROL_REG_OFFSET]
+
+ cmp r10, #INT_GPIO_BANK1 @ is it GPIO bank interrupt?
+ beq gpio @ yes - process it
+
+ mov r8, #1
+ orr r8, r11, r8, lsl r10 @ mask spurious interrupt
+ str r8, [r12, #IRQ_MIR_REG_OFFSET]
+exit:
+ subs pc, lr, #4 @ return from FIQ
+ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+
+
+ @@@@@@@@@@@@@@@@@@@@@@@@@@@
+gpio: @ GPIO bank interrupt handler
+ ldr r12, omap1510_gpio_base @ set base pointer to GPIO bank
+
+ ldr r11, [r12, #OMAP1510_GPIO_INT_MASK] @ fetch GPIO interrupts mask
+restart:
+ ldr r13, [r12, #OMAP1510_GPIO_INT_STATUS] @ fetch status bits
+ bics r13, r13, r11 @ clear masked - any left?
+ beq exit @ no - spurious interrupt? exit
+
+ orr r11, r11, r13 @ mask all requested interrupts
+ str r11, [r12, #OMAP1510_GPIO_INT_MASK]
+
+ ands r10, r13, #KEYBRD_CLK_MASK @ extract keyboard status - set?
+ beq hksw @ no - try next source
+
+
+ @@@@@@@@@@@@@@@@@@@@@@
+ @ Keyboard clock FIQ mode interrupt handler
+ @ r10 now contains KEYBRD_CLK_MASK, use it
+ str r10, [r12, #OMAP1510_GPIO_INT_STATUS] @ ack the interrupt
+ bic r11, r11, r10 @ unmask it
+ str r11, [r12, #OMAP1510_GPIO_INT_MASK]
+
+ @ Process keyboard data
+ ldr r8, [r12, #OMAP1510_GPIO_DATA_INPUT] @ fetch GPIO input
+
+ ldr r10, [r9, #BUF_STATE] @ fetch kbd interface state
+ cmp r10, #0 @ are we expecting start bit?
+ bne data @ no - go to data processing
+
+ ands r8, r8, #KEYBRD_DATA_MASK @ check start bit - detected?
+ beq hksw @ no - try next source
+
+ @ r8 contains KEYBRD_DATA_MASK, use it
+ str r8, [r9, #BUF_STATE] @ enter data processing state
+ @ r10 already contains 0, reuse it
+ str r10, [r9, #BUF_KEY] @ clear keycode
+ mov r10, #2 @ reset input bit mask
+ str r10, [r9, #BUF_MASK]
+
+ @ Mask other GPIO line interrupts till key done
+ str r11, [r9, #BUF_GPIO_INT_MASK] @ save mask for later restore
+ mvn r11, #KEYBRD_CLK_MASK @ prepare all except kbd mask
+ str r11, [r12, #OMAP1510_GPIO_INT_MASK] @ store into the mask register
+
+ b restart @ restart
+
+data: ldr r10, [r9, #BUF_MASK] @ fetch current input bit mask
+
+ @ r8 still contains GPIO input bits
+ ands r8, r8, #KEYBRD_DATA_MASK @ is keyboard data line low?
+ ldreq r8, [r9, #BUF_KEY] @ yes - fetch collected so far,
+ orreq r8, r8, r10 @ set 1 at current mask position
+ streq r8, [r9, #BUF_KEY] @ and save back
+
+ mov r10, r10, lsl #1 @ shift mask left
+ bics r10, r10, #0x800 @ have we got all the bits?
+ strne r10, [r9, #BUF_MASK] @ not yet - store the mask
+ bne restart @ and restart
+
+ @ r10 already contains 0, reuse it
+ str r10, [r9, #BUF_STATE] @ reset state to start
+
+ @ Key done - restore interrupt mask
+ ldr r10, [r9, #BUF_GPIO_INT_MASK] @ fetch saved mask
+ and r11, r11, r10 @ unmask all saved as unmasked
+ str r11, [r12, #OMAP1510_GPIO_INT_MASK] @ restore into the mask register
+
+ @ Try appending the keycode to the circular buffer
+ ldr r10, [r9, #BUF_KEYS_CNT] @ get saved keystrokes count
+ ldr r8, [r9, #BUF_BUF_LEN] @ get buffer size
+ cmp r10, r8 @ is buffer full?
+ beq hksw @ yes - key lost, next source
+
+ add r10, r10, #1 @ incremet keystrokes counter
+ str r10, [r9, #BUF_KEYS_CNT]
+
+ ldr r10, [r9, #BUF_TAIL_OFFSET] @ get buffer tail offset
+ @ r8 already contains buffer size
+ cmp r10, r8 @ end of buffer?
+ moveq r10, #0 @ yes - rewind to buffer start
+
+ ldr r12, [r9, #BUF_BUFFER_START] @ get buffer start address
+ add r12, r12, r10, LSL #2 @ calculate buffer tail address
+ ldr r8, [r9, #BUF_KEY] @ get last keycode
+ str r8, [r12] @ append it to the buffer tail
+
+ add r10, r10, #1 @ increment buffer tail offset
+ str r10, [r9, #BUF_TAIL_OFFSET]
+
+ ldr r10, [r9, #BUF_CNT_INT_KEY] @ increment interrupts counter
+ add r10, r10, #1
+ str r10, [r9, #BUF_CNT_INT_KEY]
+ @@@@@@@@@@@@@@@@@@@@@@@@
+
+
+hksw: @Is hook switch interrupt requested?
+ tst r13, #HOOK_SWITCH_MASK @ is hook switch status bit set?
+ beq mdm @ no - try next source
+
+
+ @@@@@@@@@@@@@@@@@@@@@@@@
+ @ Hook switch interrupt FIQ mode simple handler
+
+ @ Don't toggle active edge, the switch always bounces
+
+ @ Increment hook switch interrupt counter
+ ldr r10, [r9, #BUF_CNT_INT_HSW]
+ add r10, r10, #1
+ str r10, [r9, #BUF_CNT_INT_HSW]
+ @@@@@@@@@@@@@@@@@@@@@@@@
+
+
+mdm: @Is it a modem interrupt?
+ tst r13, #MODEM_IRQ_MASK @ is modem status bit set?
+ beq irq @ no - check for next interrupt
+
+
+ @@@@@@@@@@@@@@@@@@@@@@@@
+ @ Modem FIQ mode interrupt handler stub
+
+ @ Increment modem interrupt counter
+ ldr r10, [r9, #BUF_CNT_INT_MDM]
+ add r10, r10, #1
+ str r10, [r9, #BUF_CNT_INT_MDM]
+ @@@@@@@@@@@@@@@@@@@@@@@@
+
+
+irq: @ Place deferred_fiq interrupt request
+ ldr r12, deferred_fiq_ih_base @ set pointer to IRQ handler
+ mov r10, #DEFERRED_FIQ_MASK @ set deferred_fiq bit
+ str r10, [r12, #IRQ_ISR_REG_OFFSET] @ place it in the ISR register
+
+ ldr r12, omap1510_gpio_base @ set pointer back to GPIO bank
+ b restart @ check for next GPIO interrupt
+ @@@@@@@@@@@@@@@@@@@@@@@@@@@
+
+
+/*
+ * Virtual addresses for IO
+ */
+omap_ih1_base:
+ .word OMAP1_IO_ADDRESS(OMAP_IH1_BASE)
+deferred_fiq_ih_base:
+ .word OMAP1_IO_ADDRESS(DEFERRED_FIQ_IH_BASE)
+omap1510_gpio_base:
+ .word OMAP1_IO_ADDRESS(OMAP1510_GPIO_BASE)
+qwerty_fiqin_end:
+
+/*
+ * Check the size of the FIQ,
+ * it cannot go beyond 0xffff0200, and is copied to 0xffff001c
+ */
+.if (qwerty_fiqin_end - qwerty_fiqin_start) > (0x200 - 0x1c)
+ .err
+.endif
git.openpandora.org / pandora-kernel.git / commitdiff