+
+#define PIT_CTRL (PIT_BASE + 0x0d)
+#define PIT_T2 (PIT_BASE + 0x09)
+#define PIT_T1 (PIT_BASE + 0x05)
+#define PIT_T0 (PIT_BASE + 0x01)
+
+/*
+ * This is the rate at which your MCLK signal toggles (in Hz)
+ * This was measured on a 10 digit frequency counter sampling
+ * over 1 second.
+ */
+#define MCLK 47894000
+
+/*
+ * This is the rate at which the PIT timers get clocked
+ */
+#define CLKBY7 (MCLK / 7)
+
+/*
+ * This is the counter value. We tick at 200Hz on this platform.
+ */
+#define COUNT ((CLKBY7 + (HZ / 2)) / HZ)
+
+/*
+ * Get the time offset from the system PIT. Note that if we have missed an
+ * interrupt, then the PIT counter will roll over (ie, be negative).
+ * This actually works out to be convenient.
+ */
+static unsigned long ebsa110_gettimeoffset(void)
+{
+ unsigned long offset, count;
+
+ __raw_writeb(0x40, PIT_CTRL);
+ count = __raw_readb(PIT_T1);
+ count |= __raw_readb(PIT_T1) << 8;
+
+ /*
+ * If count > COUNT, make the number negative.
+ */
+ if (count > COUNT)
+ count |= 0xffff0000;
+
+ offset = COUNT;
+ offset -= count;
+
+ /*
+ * `offset' is in units of timer counts. Convert
+ * offset to units of microseconds.
+ */
+ offset = offset * (1000000 / HZ) / COUNT;
+
+ return offset;
+}
+
+static irqreturn_t
+ebsa110_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ u32 count;
+
+ write_seqlock(&xtime_lock);
+
+ /* latch and read timer 1 */
+ __raw_writeb(0x40, PIT_CTRL);
+ count = __raw_readb(PIT_T1);
+ count |= __raw_readb(PIT_T1) << 8;
+
+ count += COUNT;
+
+ __raw_writeb(count & 0xff, PIT_T1);
+ __raw_writeb(count >> 8, PIT_T1);
+
+ timer_tick(regs);
+
+ write_sequnlock(&xtime_lock);
+
+ return IRQ_HANDLED;
+}
+
+static struct irqaction ebsa110_timer_irq = {
+ .name = "EBSA110 Timer Tick",
+ .flags = SA_INTERRUPT | SA_TIMER,
+ .handler = ebsa110_timer_interrupt,
+};
+
+/*
+ * Set up timer interrupt.
+ */
+static void __init ebsa110_timer_init(void)
+{
+ /*
+ * Timer 1, mode 2, LSB/MSB
+ */
+ __raw_writeb(0x70, PIT_CTRL);
+ __raw_writeb(COUNT & 0xff, PIT_T1);
+ __raw_writeb(COUNT >> 8, PIT_T1);
+
+ setup_irq(IRQ_EBSA110_TIMER0, &ebsa110_timer_irq);
+}
+
+static struct sys_timer ebsa110_timer = {
+ .init = ebsa110_timer_init,
+ .offset = ebsa110_gettimeoffset,
+};
+
+static struct plat_serial8250_port serial_platform_data[] = {
+ {
+ .iobase = 0x3f8,
+ .irq = 1,
+ .uartclk = 1843200,
+ .regshift = 0,
+ .iotype = UPIO_PORT,
+ .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
+ },
+ {
+ .iobase = 0x2f8,
+ .irq = 2,
+ .uartclk = 1843200,
+ .regshift = 0,
+ .iotype = UPIO_PORT,
+ .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
+ },
+ { },
+};
+
+static struct platform_device serial_device = {
+ .name = "serial8250",
+ .id = PLAT8250_DEV_PLATFORM,
+ .dev = {
+ .platform_data = serial_platform_data,
+ },
+};
+
+static struct resource am79c961_resources[] = {
+ {
+ .start = 0x220,
+ .end = 0x238,
+ .flags = IORESOURCE_IO,
+ }, {
+ .start = IRQ_EBSA110_ETHERNET,
+ .end = IRQ_EBSA110_ETHERNET,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+static struct platform_device am79c961_device = {
+ .name = "am79c961",
+ .id = -1,
+ .num_resources = ARRAY_SIZE(am79c961_resources),
+ .resource = am79c961_resources,
+};
+
+static struct platform_device *ebsa110_devices[] = {
+ &serial_device,
+ &am79c961_device,
+};
+
+static int __init ebsa110_init(void)
+{
+ return platform_add_devices(ebsa110_devices, ARRAY_SIZE(ebsa110_devices));
+}
+
+arch_initcall(ebsa110_init);
+