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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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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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 * (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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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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 */
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/** @addtogroup genarch
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/** @addtogroup genarch
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 * @{
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 * @{
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 */
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 */
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/**
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/**
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 * @file
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 * @file
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 * @brief   NS 16550 serial controller driver.
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 * @brief NS 16550 serial controller driver.
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 */
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 */
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#include <genarch/drivers/ns16550/ns16550.h>
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#include <genarch/drivers/ns16550/ns16550.h>
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#include <ddi/irq.h>
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#include <ddi/irq.h>
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#include <arch/asm.h>
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#include <arch/asm.h>
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#include <console/chardev.h>
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#include <console/chardev.h>
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#include <mm/slab.h>
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#include <mm/slab.h>
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#define LSR_DATA_READY  0x01
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#define LSR_DATA_READY  0x01
- 
 
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- 
 
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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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{
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    ns16550_instance_t *instance = irq->instance;
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    ns16550_t *dev = instance->ns16550;
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- 
 
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    if (pio_read_8(&dev->lsr) & LSR_DATA_READY)
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        return IRQ_ACCEPT;
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    else
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        return IRQ_DECLINE;
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}
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static void ns16550_irq_handler(irq_t *irq)
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{
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    ns16550_instance_t *instance = irq->instance;
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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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        uint8_t x = pio_read_8(&dev->rbr);
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        chardev_push_character(&instance->kbrdin, x);
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    }
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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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 * @param devout    Output character device.
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 * @return Keyboard device pointer or NULL on failure.
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 *
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 *
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 * @return      True on success, false on failure.
 - 
 
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 */
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 */
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bool
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ns16550_init(ns16550_t *dev, devno_t devno, inr_t inr, cir_t cir, void *cir_arg,
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indev_t *ns16550_init(ns16550_t *dev, devno_t devno, inr_t inr, cir_t cir, void *cir_arg)
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    chardev_t *devout)
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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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 - 
 
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    instance = 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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        return false;
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        return NULL;
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    indev_initialize("ns16550", &instance->kbrdin, &kbrdin_ops);
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    instance->devno = devno;
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    instance->devno = devno;
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    instance->ns16550 = dev;
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    instance->ns16550 = dev;
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    instance->devout = devout;
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    irq_initialize(&instance->irq);
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    irq_initialize(&instance->irq);
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    instance->irq.devno = devno;
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    instance->irq.devno = devno;
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    instance->irq.inr = inr;
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    instance->irq.inr = inr;
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    instance->irq.claim = ns16550_claim;
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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.handler = ns16550_irq_handler;
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    instance->irq.instance = instance;
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    instance->irq.instance = instance;
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    instance->irq.cir = cir;
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    instance->irq.cir = cir;
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    instance->irq.cir_arg = cir_arg;
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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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    while ((pio_read_8(&dev->lsr) & LSR_DATA_READY))
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        (void) pio_read_8(&dev->rbr);
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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(&dev->ier, IER_ERBFI);
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    pio_write_8(&dev->mcr, MCR_OUT2);
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    pio_write_8(&dev->mcr, MCR_OUT2);
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    return true;
 - 
 
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}
 - 
 
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 - 
 
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irq_ownership_t ns16550_claim(irq_t *irq)
 - 
 
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{
 - 
 
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    ns16550_instance_t *instance = irq->instance;
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    ns16550_t *dev = instance->ns16550;
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 - 
 
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    if (pio_read_8(&dev->lsr) & LSR_DATA_READY)
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        return IRQ_ACCEPT;
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    else
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        return IRQ_DECLINE;
 - 
 
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}
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 - 
 
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void ns16550_irq_handler(irq_t *irq)
 - 
 
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{
 - 
 
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    ns16550_instance_t *instance = irq->instance;
 - 
 
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    ns16550_t *dev = instance->ns16550;
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 - 
 
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    if (pio_read_8(&dev->lsr) & LSR_DATA_READY) {
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        uint8_t x;
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 - 
 
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        x = pio_read_8(&dev->rbr);
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        if (instance->devout)
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    return &instance->kbrdin;
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            chardev_push_character(instance->devout, x);
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    }
 - 
 
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}
 112 
}
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 113 
 
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/** @}
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/** @}
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 */
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 */