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4651 pillai 1 
/*
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 * Copyright (c) 2007 Michal Kebrt, Petr Stepan
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup arm32gxemul
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 * @{
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 */
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/** @file
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 *  @brief GXemul drivers.
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 */
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#include <arch/exception.h>
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#include <arch/mach/testarm/testarm.h>
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#include <mm/page.h>
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#include <genarch/fb/fb.h>
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#include <genarch/fb/visuals.h>
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#include <genarch/drivers/dsrln/dsrlnin.h>
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#include <genarch/drivers/dsrln/dsrlnout.h>
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#include <genarch/srln/srln.h>
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#include <console/console.h>
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#include <ddi/irq.h>
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#include <ddi/device.h>
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#include <config.h>
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#include <sysinfo/sysinfo.h>
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#include <interrupt.h>
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#include <print.h>
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void *gxemul_kbd;
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void *gxemul_rtc;
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void *gxemul_irqc;
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static irq_t gxemul_timer_irq;
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struct arm_machine_ops machine_ops = {
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    MACHINE_GENFUNC,
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    MACHINE_GENFUNC,
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    gxemul_init,
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    gxemul_timer_irq_start,
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    gxemul_cpu_halt,
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    gxemul_get_memory_size,
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    gxemul_fb_init,
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    gxemul_irq_exception,
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    gxemul_get_fb_address,
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    gxemul_frame_init,
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    gxemul_output_init,
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    gxemul_input_init
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};
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void gxemul_init(void)
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{
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    gxemul_kbd = (void *) hw_map(GXEMUL_KBD_ADDRESS, PAGE_SIZE);
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    gxemul_rtc = (void *) hw_map(GXEMUL_RTC_ADDRESS, PAGE_SIZE);
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    gxemul_irqc = (void *) hw_map(GXEMUL_IRQC_ADDRESS, PAGE_SIZE);
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}
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void gxemul_fb_init(void)
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{
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    fb_properties_t prop = {
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        .addr = GXEMUL_FB_ADDRESS,
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        .offset = 0,
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        .x = 640,
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        .y = 480,
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        .scan = 1920,
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        .visual = VISUAL_RGB_8_8_8,
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    };
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    fb_init(&prop);
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}
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void gxemul_output_init(void)
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{
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    dsrlnout_init((ioport8_t *) gxemul_kbd);
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}
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void gxemul_input_init(void)
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{
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#ifdef CONFIG_ARM_KBD
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    /*
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     * Initialize the GXemul keyboard port. Then initialize the serial line
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     * module and connect it to the GXemul keyboard.
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     */
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    dsrlnin_instance_t *dsrlnin_instance
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        = dsrlnin_init((dsrlnin_t *) gxemul_kbd, GXEMUL_KBD_IRQ);
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    if (dsrlnin_instance) {
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        srln_instance_t *srln_instance = srln_init();
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        if (srln_instance) {
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            indev_t *sink = stdin_wire();
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            indev_t *srln = srln_wire(srln_instance, sink);
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            dsrlnin_wire(dsrlnin_instance, srln);
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        }
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    }
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    /*
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     * This is the necessary evil until the userspace driver is entirely
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     * self-sufficient.
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     */
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    sysinfo_set_item_val("kbd", NULL, true);
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    sysinfo_set_item_val("kbd.inr", NULL, GXEMUL_KBD_IRQ);
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    sysinfo_set_item_val("kbd.address.virtual", NULL, (unative_t) gxemul_kbd);
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#endif
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}
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/** Starts gxemul Real Time Clock device, which asserts regular interrupts.
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 *
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 * @param frequency Interrupts frequency (0 disables RTC).
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 */
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static void gxemul_timer_start(uint32_t frequency)
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{
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    *((uint32_t *) (gxemul_rtc + GXEMUL_RTC_FREQ_OFFSET))
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        = frequency;
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}
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static irq_ownership_t gxemul_timer_claim(irq_t *irq)
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{
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    return IRQ_ACCEPT;
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}
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/** Timer interrupt handler.
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 *
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 * @param irq Interrupt information.
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 * @param arg Not used.
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 */
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static void gxemul_timer_irq_handler(irq_t *irq)
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{
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    /*
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    * We are holding a lock which prevents preemption.
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    * Release the lock, call clock() and reacquire the lock again.
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    */
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    spinlock_unlock(&irq->lock);
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    clock();
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    spinlock_lock(&irq->lock);
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    /* acknowledge tick */
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    *((uint32_t *) (gxemul_rtc + GXEMUL_RTC_ACK_OFFSET))
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        = 0;
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}
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/** Initializes and registers timer interrupt handler. */
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static void gxemul_timer_irq_init(void)
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{
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        irq_initialize(&gxemul_timer_irq);
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        gxemul_timer_irq.devno = device_assign_devno();
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        gxemul_timer_irq.inr = GXEMUL_TIMER_IRQ;
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        gxemul_timer_irq.claim = gxemul_timer_claim;
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        gxemul_timer_irq.handler = gxemul_timer_irq_handler;
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        irq_register(&gxemul_timer_irq);
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}
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/** Starts timer.
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 *
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 * Initiates regular timer interrupts after initializing
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 * corresponding interrupt handler.
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 */
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void gxemul_timer_irq_start(void)
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{
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        gxemul_timer_irq_init();
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        gxemul_timer_start(GXEMUL_TIMER_FREQ);
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}
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/** Returns the size of emulated memory.
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 *
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 * @return Size in bytes.
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 */
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uintptr_t gxemul_get_memory_size(void)
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{
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        return  *((uintptr_t *) (GXEMUL_MP_ADDRESS + GXEMUL_MP_MEMSIZE_OFFSET));
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}
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/** Returns the mask of active interrupts. */
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static inline uint32_t gxemul_irqc_get_sources(void)
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{
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    return *((uint32_t *) gxemul_irqc);
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}
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/** Interrupt Exception handler.
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 *
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 * Determines the sources of interrupt and calls their handlers.
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 */
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void gxemul_irq_exception(int exc_no, istate_t *istate)
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{
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    uint32_t sources = gxemul_irqc_get_sources();
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    unsigned int i;
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    for (i = 0; i < GXEMUL_IRQC_MAX_IRQ; i++) {
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        if (sources & (1 << i)) {
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            irq_t *irq = irq_dispatch_and_lock(i);
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            if (irq) {
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                /* The IRQ handler was found. */
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                irq->handler(irq);
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                spinlock_unlock(&irq->lock);
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            } else {
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                /* Spurious interrupt.*/
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                printf("cpu%d: spurious interrupt (inum=%d)\n",
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                    CPU->id, i);
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            }
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        }
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    }
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}
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void gxemul_cpu_halt(void)
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{
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    *((char *) (gxemul_kbd + GXEMUL_HALT_OFFSET)) = 0;
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}
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void gxemul_frame_init(void)
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{
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}
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uintptr_t gxemul_get_fb_address()
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{
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    return ((uintptr_t)GXEMUL_FB_ADDRESS);
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}
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/** @}
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 */