clang-format
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@@ -35,158 +35,139 @@
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#include "autoconf.h"
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/* Registers (offsets within slot) */
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#define LSER_REG_CHAR 0 /* Character in/out */
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#define LSER_REG_WIRQ 4 /* Write interrupt status */
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#define LSER_REG_RIRQ 8 /* Read interrupt status */
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#define LSER_REG_CHAR 0 /* Character in/out */
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#define LSER_REG_WIRQ 4 /* Write interrupt status */
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#define LSER_REG_RIRQ 8 /* Read interrupt status */
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/* Bits in the IRQ registers */
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#define LSER_IRQ_ENABLE 1
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#define LSER_IRQ_ACTIVE 2
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#define LSER_IRQ_FORCE 4
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#define LSER_IRQ_ENABLE 1
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#define LSER_IRQ_ACTIVE 2
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#define LSER_IRQ_FORCE 4
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void
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lser_irq(void *vsc)
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{
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struct lser_softc *sc = vsc;
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uint32_t x;
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bool clear_to_write = false;
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bool got_a_read = false;
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uint32_t ch = 0;
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void lser_irq(void *vsc) {
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struct lser_softc *sc = vsc;
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uint32_t x;
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bool clear_to_write = false;
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bool got_a_read = false;
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uint32_t ch = 0;
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spinlock_acquire(&sc->ls_lock);
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spinlock_acquire(&sc->ls_lock);
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x = bus_read_register(sc->ls_busdata, sc->ls_buspos, LSER_REG_WIRQ);
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if (x & LSER_IRQ_ACTIVE) {
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x = LSER_IRQ_ENABLE;
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sc->ls_wbusy = 0;
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clear_to_write = true;
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bus_write_register(sc->ls_busdata, sc->ls_buspos,
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LSER_REG_WIRQ, x);
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}
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x = bus_read_register(sc->ls_busdata, sc->ls_buspos, LSER_REG_WIRQ);
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if (x & LSER_IRQ_ACTIVE) {
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x = LSER_IRQ_ENABLE;
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sc->ls_wbusy = 0;
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clear_to_write = true;
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bus_write_register(sc->ls_busdata, sc->ls_buspos, LSER_REG_WIRQ, x);
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}
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x = bus_read_register(sc->ls_busdata, sc->ls_buspos, LSER_REG_RIRQ);
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if (x & LSER_IRQ_ACTIVE) {
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x = LSER_IRQ_ENABLE;
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ch = bus_read_register(sc->ls_busdata, sc->ls_buspos,
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LSER_REG_CHAR);
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got_a_read = true;
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bus_write_register(sc->ls_busdata, sc->ls_buspos,
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LSER_REG_RIRQ, x);
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}
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x = bus_read_register(sc->ls_busdata, sc->ls_buspos, LSER_REG_RIRQ);
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if (x & LSER_IRQ_ACTIVE) {
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x = LSER_IRQ_ENABLE;
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ch = bus_read_register(sc->ls_busdata, sc->ls_buspos, LSER_REG_CHAR);
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got_a_read = true;
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bus_write_register(sc->ls_busdata, sc->ls_buspos, LSER_REG_RIRQ, x);
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}
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spinlock_release(&sc->ls_lock);
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spinlock_release(&sc->ls_lock);
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if (clear_to_write && sc->ls_start != NULL) {
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sc->ls_start(sc->ls_devdata);
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}
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if (got_a_read && sc->ls_input != NULL) {
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sc->ls_input(sc->ls_devdata, ch);
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}
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if (clear_to_write && sc->ls_start != NULL) {
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sc->ls_start(sc->ls_devdata);
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}
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if (got_a_read && sc->ls_input != NULL) {
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sc->ls_input(sc->ls_devdata, ch);
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}
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}
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void
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lser_write(void *vls, int ch)
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{
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struct lser_softc *ls = vls;
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void lser_write(void *vls, int ch) {
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struct lser_softc *ls = vls;
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spinlock_acquire(&ls->ls_lock);
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spinlock_acquire(&ls->ls_lock);
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if (ls->ls_wbusy) {
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/*
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* We're not clear to write.
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*
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* This should not happen. It's the job of the driver
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* attached to us to not write until we call
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* ls->ls_start.
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*
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* (Note: if we're the console, the panic will go to
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* lser_writepolled for printing, because we hold a
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* spinlock and interrupts are off; it won't recurse.)
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*/
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panic("lser: Not clear to write\n");
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}
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ls->ls_wbusy = true;
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if (ls->ls_wbusy) {
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/*
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* We're not clear to write.
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*
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* This should not happen. It's the job of the driver
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* attached to us to not write until we call
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* ls->ls_start.
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*
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* (Note: if we're the console, the panic will go to
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* lser_writepolled for printing, because we hold a
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* spinlock and interrupts are off; it won't recurse.)
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*/
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panic("lser: Not clear to write\n");
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}
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ls->ls_wbusy = true;
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bus_write_register(ls->ls_busdata, ls->ls_buspos, LSER_REG_CHAR, ch);
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bus_write_register(ls->ls_busdata, ls->ls_buspos, LSER_REG_CHAR, ch);
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spinlock_release(&ls->ls_lock);
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spinlock_release(&ls->ls_lock);
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}
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static
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void
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lser_poll_until_write(struct lser_softc *sc)
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{
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uint32_t val;
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static void lser_poll_until_write(struct lser_softc *sc) {
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uint32_t val;
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KASSERT(spinlock_do_i_hold(&sc->ls_lock));
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KASSERT(spinlock_do_i_hold(&sc->ls_lock));
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do {
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val = bus_read_register(sc->ls_busdata, sc->ls_buspos,
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LSER_REG_WIRQ);
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}
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while ((val & LSER_IRQ_ACTIVE) == 0);
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do {
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val = bus_read_register(sc->ls_busdata, sc->ls_buspos, LSER_REG_WIRQ);
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} while ((val & LSER_IRQ_ACTIVE) == 0);
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}
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void
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lser_writepolled(void *vsc, int ch)
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{
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struct lser_softc *sc = vsc;
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bool irqpending;
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void lser_writepolled(void *vsc, int ch) {
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struct lser_softc *sc = vsc;
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bool irqpending;
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spinlock_acquire(&sc->ls_lock);
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spinlock_acquire(&sc->ls_lock);
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if (sc->ls_wbusy) {
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irqpending = true;
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lser_poll_until_write(sc);
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/* Clear the ready condition, but leave the IRQ asserted */
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bus_write_register(sc->ls_busdata, sc->ls_buspos,
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LSER_REG_WIRQ,
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LSER_IRQ_FORCE|LSER_IRQ_ENABLE);
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}
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else {
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irqpending = false;
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/* Clear the interrupt enable bit */
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bus_write_register(sc->ls_busdata, sc->ls_buspos,
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LSER_REG_WIRQ, 0);
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}
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if (sc->ls_wbusy) {
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irqpending = true;
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lser_poll_until_write(sc);
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/* Clear the ready condition, but leave the IRQ asserted */
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bus_write_register(sc->ls_busdata, sc->ls_buspos, LSER_REG_WIRQ,
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LSER_IRQ_FORCE | LSER_IRQ_ENABLE);
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} else {
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irqpending = false;
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/* Clear the interrupt enable bit */
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bus_write_register(sc->ls_busdata, sc->ls_buspos, LSER_REG_WIRQ, 0);
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}
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/* Send the character. */
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bus_write_register(sc->ls_busdata, sc->ls_buspos, LSER_REG_CHAR, ch);
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/* Send the character. */
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bus_write_register(sc->ls_busdata, sc->ls_buspos, LSER_REG_CHAR, ch);
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/* Wait until it's done. */
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lser_poll_until_write(sc);
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/* Wait until it's done. */
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lser_poll_until_write(sc);
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/*
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* If there wasn't already an IRQ pending, clear the ready
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* condition and turn interruption back on. But if there was,
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* leave the register alone, with the ready condition set (and
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* the force bit still on); in due course we'll get to the
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* interrupt handler and they'll be cleared.
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*/
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if (!irqpending) {
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bus_write_register(sc->ls_busdata, sc->ls_buspos,
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LSER_REG_WIRQ, LSER_IRQ_ENABLE);
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}
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/*
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* If there wasn't already an IRQ pending, clear the ready
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* condition and turn interruption back on. But if there was,
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* leave the register alone, with the ready condition set (and
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* the force bit still on); in due course we'll get to the
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* interrupt handler and they'll be cleared.
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*/
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if (!irqpending) {
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bus_write_register(sc->ls_busdata, sc->ls_buspos, LSER_REG_WIRQ,
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LSER_IRQ_ENABLE);
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}
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spinlock_release(&sc->ls_lock);
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spinlock_release(&sc->ls_lock);
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}
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int
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config_lser(struct lser_softc *sc, int lserno)
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{
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(void)lserno;
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int config_lser(struct lser_softc *sc, int lserno) {
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(void)lserno;
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/*
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* Enable interrupting.
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*/
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/*
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* Enable interrupting.
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*/
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spinlock_init(&sc->ls_lock);
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sc->ls_wbusy = false;
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spinlock_init(&sc->ls_lock);
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sc->ls_wbusy = false;
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bus_write_register(sc->ls_busdata, sc->ls_buspos,
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LSER_REG_RIRQ, LSER_IRQ_ENABLE);
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bus_write_register(sc->ls_busdata, sc->ls_buspos,
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LSER_REG_WIRQ, LSER_IRQ_ENABLE);
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bus_write_register(sc->ls_busdata, sc->ls_buspos, LSER_REG_RIRQ,
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LSER_IRQ_ENABLE);
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bus_write_register(sc->ls_busdata, sc->ls_buspos, LSER_REG_WIRQ,
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LSER_IRQ_ENABLE);
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return 0;
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return 0;
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}
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