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#include <mm/slab.h>
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#include <mm/slab.h>
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#include <ddi/device.h>
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#include <ddi/device.h>
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#define LSR_DATA_READY  0x01
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#define LSR_DATA_READY  0x01
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static indev_operations_t kbrdin_ops = {
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    .poll = NULL
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};
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static irq_ownership_t ns16550_claim(irq_t *irq)
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static irq_ownership_t ns16550_claim(irq_t *irq)
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{
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{
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    ns16550_instance_t *instance = irq->instance;
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    ns16550_instance_t *instance = irq->instance;
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    ns16550_t *dev = instance->ns16550;
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    ns16550_t *dev = instance->ns16550;
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{
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{
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    ns16550_instance_t *instance = irq->instance;
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    ns16550_instance_t *instance = irq->instance;
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    ns16550_t *dev = instance->ns16550;
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    ns16550_t *dev = instance->ns16550;
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    if (pio_read_8(&dev->lsr) & LSR_DATA_READY) {
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    if (pio_read_8(&dev->lsr) & LSR_DATA_READY) {
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        uint8_t x = pio_read_8(&dev->rbr);
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        uint8_t data = pio_read_8(&dev->rbr);
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        indev_push_character(&instance->kbrdin, x);
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        indev_push_character(instance->kbrdin, data);
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    }
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    }
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}
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}
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/**< Clear input buffer. */
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static void ns16550_clear_buffer(ns16550_t *dev)
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{
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    while ((pio_read_8(&dev->lsr) & LSR_DATA_READY))
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        (void) pio_read_8(&dev->rbr);
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}
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/** Initialize ns16550.
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/** Initialize ns16550.
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 *
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 *
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 * @param dev      Addrress of the beginning of the device in I/O space.
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 * @param dev      Addrress of the beginning of the device in I/O space.
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 * @param devno    Device number.
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 * @param devno    Device number.
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 * @param inr      Interrupt number.
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 * @param inr      Interrupt number.
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 * @param cir      Clear interrupt function.
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 * @param cir      Clear interrupt function.
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 * @param cir_arg  First argument to cir.
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 * @param cir_arg  First argument to cir.
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 *
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 *
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 * @return Keyboard device pointer or NULL on failure.
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 * @return Keyboard instance or NULL on failure.
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 *
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 *
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 */
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 */
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indev_t *ns16550_init(ns16550_t *dev, inr_t inr, cir_t cir, void *cir_arg)
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ns16550_instance_t *ns16550_init(ns16550_t *dev, inr_t inr, cir_t cir, void *cir_arg)
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{
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{
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    ns16550_instance_t *instance
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    ns16550_instance_t *instance
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        = malloc(sizeof(ns16550_instance_t), FRAME_ATOMIC);
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        = malloc(sizeof(ns16550_instance_t), FRAME_ATOMIC);
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    if (!instance)
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    if (instance) {
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        instance->ns16550 = dev;
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        return NULL;
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        instance->kbrdin = NULL;
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    indev_initialize("ns16550", &instance->kbrdin, &kbrdin_ops);
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        irq_initialize(&instance->irq);
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        instance->irq.devno = device_assign_devno();
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        instance->irq.inr = inr;
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        instance->irq.claim = ns16550_claim;
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        instance->irq.handler = ns16550_irq_handler;
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        instance->irq.instance = instance;
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        instance->irq.cir = cir;
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        instance->irq.cir_arg = cir_arg;
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    }
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    instance->ns16550 = dev;
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    return instance;
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}
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void ns16550_wire(ns16550_instance_t *instance, indev_t *kbrdin)
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{
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    ASSERT(instance);
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    ASSERT(kbrdin);
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    irq_initialize(&instance->irq);
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    instance->irq.devno = device_assign_devno();
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    instance->irq.inr = inr;
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    instance->kbrdin = kbrdin;
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    instance->irq.claim = ns16550_claim;
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    instance->irq.handler = ns16550_irq_handler;
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    instance->irq.instance = instance;
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    instance->irq.cir = cir;
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    instance->irq.cir_arg = cir_arg;
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    irq_register(&instance->irq);
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    irq_register(&instance->irq);
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    while ((pio_read_8(&dev->lsr) & LSR_DATA_READY))
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    ns16550_clear_buffer(instance->ns16550);
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        (void) pio_read_8(&dev->rbr);
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    /* Enable interrupts */
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    /* Enable interrupts */
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    pio_write_8(&dev->ier, IER_ERBFI);
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    pio_write_8(&instance->ns16550->ier, IER_ERBFI);
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    pio_write_8(&dev->mcr, MCR_OUT2);
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    pio_write_8(&instance->ns16550->mcr, MCR_OUT2);
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    return &instance->kbrdin;
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}
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}
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/** @}
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/** @}
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 */
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 */