#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/bitops.h>
-#include <linux/serial_core.h>
+#include <linux/serial_8250.h>
#include <linux/mm.h>
#include <asm/types.h>
#include <asm/mach/time.h>
#include <asm/mach/irq.h>
+#include <asm/arch/gpio.h>
+
static DEFINE_SPINLOCK(ixp2000_slowport_lock);
static unsigned long ixp2000_slowport_irq_flags;
.physical = IXP2000_PCI_CSR_PHYS_BASE,
.length = IXP2000_PCI_CSR_SIZE,
.type = MT_DEVICE
+ }, {
+ .virtual = IXP2000_MSF_VIRT_BASE,
+ .physical = IXP2000_MSF_PHYS_BASE,
+ .length = IXP2000_MSF_SIZE,
+ .type = MT_DEVICE
}, {
.virtual = IXP2000_PCI_IO_VIRT_BASE,
.physical = IXP2000_PCI_IO_PHYS_BASE,
}
};
-static struct uart_port ixp2000_serial_port = {
- .membase = (char *)(IXP2000_UART_VIRT_BASE + 3),
- .mapbase = IXP2000_UART_PHYS_BASE + 3,
- .irq = IRQ_IXP2000_UART,
- .flags = UPF_SKIP_TEST,
- .iotype = UPIO_MEM,
- .regshift = 2,
- .uartclk = 50000000,
- .line = 0,
- .type = PORT_XSCALE,
- .fifosize = 16
-};
-
void __init ixp2000_map_io(void)
{
extern unsigned int processor_id;
}
iotable_init(ixp2000_io_desc, ARRAY_SIZE(ixp2000_io_desc));
- early_serial_setup(&ixp2000_serial_port);
/* Set slowport to 8-bit mode. */
ixp2000_reg_write(IXP2000_SLOWPORT_FRM, 1);
}
+
+/*************************************************************************
+ * Serial port support for IXP2000
+ *************************************************************************/
+static struct plat_serial8250_port ixp2000_serial_port[] = {
+ {
+ .mapbase = IXP2000_UART_PHYS_BASE,
+ .membase = (char *)(IXP2000_UART_VIRT_BASE + 3),
+ .irq = IRQ_IXP2000_UART,
+ .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
+ .iotype = UPIO_MEM,
+ .regshift = 2,
+ .uartclk = 50000000,
+ },
+ { },
+};
+
+static struct resource ixp2000_uart_resource = {
+ .start = IXP2000_UART_PHYS_BASE,
+ .end = IXP2000_UART_PHYS_BASE + 0xffff,
+ .flags = IORESOURCE_MEM,
+};
+
+static struct platform_device ixp2000_serial_device = {
+ .name = "serial8250",
+ .id = 0,
+ .dev = {
+ .platform_data = ixp2000_serial_port,
+ },
+ .num_resources = 1,
+ .resource = &ixp2000_uart_resource,
+};
+
+void __init ixp2000_uart_init(void)
+{
+ platform_device_register(&ixp2000_serial_device);
+}
+
+
/*************************************************************************
* Timer-tick functions for IXP2000
*************************************************************************/
static unsigned ticks_per_jiffy;
static unsigned ticks_per_usec;
static unsigned next_jiffy_time;
+static volatile unsigned long *missing_jiffy_timer_csr;
unsigned long ixp2000_gettimeoffset (void)
{
unsigned long offset;
- offset = next_jiffy_time - *IXP2000_T4_CSR;
+ offset = next_jiffy_time - *missing_jiffy_timer_csr;
return offset / ticks_per_usec;
}
/* clear timer 1 */
ixp2000_reg_write(IXP2000_T1_CLR, 1);
-
- while ((next_jiffy_time - *IXP2000_T4_CSR) > ticks_per_jiffy) {
+
+ while ((next_jiffy_time - *missing_jiffy_timer_csr) > ticks_per_jiffy) {
timer_tick(regs);
next_jiffy_time -= ticks_per_jiffy;
}
static struct irqaction ixp2000_timer_irq = {
.name = "IXP2000 Timer Tick",
- .flags = SA_INTERRUPT,
- .handler = ixp2000_timer_interrupt
+ .flags = SA_INTERRUPT | SA_TIMER,
+ .handler = ixp2000_timer_interrupt,
};
void __init ixp2000_init_time(unsigned long tick_rate)
{
- ixp2000_reg_write(IXP2000_T1_CLR, 0);
- ixp2000_reg_write(IXP2000_T4_CLR, 0);
-
ticks_per_jiffy = (tick_rate + HZ/2) / HZ;
ticks_per_usec = tick_rate / 1000000;
+ /*
+ * We use timer 1 as our timer interrupt.
+ */
+ ixp2000_reg_write(IXP2000_T1_CLR, 0);
ixp2000_reg_write(IXP2000_T1_CLD, ticks_per_jiffy - 1);
ixp2000_reg_write(IXP2000_T1_CTL, (1 << 7));
/*
- * We use T4 as a monotonic counter to track missed jiffies
+ * We use a second timer as a monotonic counter for tracking
+ * missed jiffies. The IXP2000 has four timers, but if we're
+ * on an A-step IXP2800, timer 2 and 3 don't work, so on those
+ * chips we use timer 4. Timer 4 is the only timer that can
+ * be used for the watchdog, so we use timer 2 if we're on a
+ * non-buggy chip.
*/
- ixp2000_reg_write(IXP2000_T4_CLD, -1);
- ixp2000_reg_write(IXP2000_T4_CTL, (1 << 7));
+ if ((*IXP2000_PRODUCT_ID & 0x001ffef0) == 0x00000000) {
+ printk(KERN_INFO "Enabling IXP2800 erratum #25 workaround\n");
+
+ ixp2000_reg_write(IXP2000_T4_CLR, 0);
+ ixp2000_reg_write(IXP2000_T4_CLD, -1);
+ ixp2000_reg_write(IXP2000_T4_CTL, (1 << 7));
+ missing_jiffy_timer_csr = IXP2000_T4_CSR;
+ } else {
+ ixp2000_reg_write(IXP2000_T2_CLR, 0);
+ ixp2000_reg_write(IXP2000_T2_CLD, -1);
+ ixp2000_reg_write(IXP2000_T2_CTL, (1 << 7));
+ missing_jiffy_timer_csr = IXP2000_T2_CSR;
+ }
next_jiffy_time = 0xffffffff;
/* register for interrupt */
/*************************************************************************
* GPIO helpers
*************************************************************************/
-static unsigned long GPIO_IRQ_rising_edge;
static unsigned long GPIO_IRQ_falling_edge;
+static unsigned long GPIO_IRQ_rising_edge;
static unsigned long GPIO_IRQ_level_low;
static unsigned long GPIO_IRQ_level_high;
-void gpio_line_config(int line, int style)
+static void update_gpio_int_csrs(void)
+{
+ ixp2000_reg_write(IXP2000_GPIO_FEDR, GPIO_IRQ_falling_edge);
+ ixp2000_reg_write(IXP2000_GPIO_REDR, GPIO_IRQ_rising_edge);
+ ixp2000_reg_write(IXP2000_GPIO_LSLR, GPIO_IRQ_level_low);
+ ixp2000_reg_write(IXP2000_GPIO_LSHR, GPIO_IRQ_level_high);
+}
+
+void gpio_line_config(int line, int direction)
{
unsigned long flags;
local_irq_save(flags);
+ if (direction == GPIO_OUT) {
+ irq_desc[line + IRQ_IXP2000_GPIO0].valid = 0;
- if(style == GPIO_OUT) {
/* if it's an output, it ain't an interrupt anymore */
- ixp2000_reg_write(IXP2000_GPIO_PDSR, (1 << line));
GPIO_IRQ_falling_edge &= ~(1 << line);
GPIO_IRQ_rising_edge &= ~(1 << line);
GPIO_IRQ_level_low &= ~(1 << line);
GPIO_IRQ_level_high &= ~(1 << line);
- ixp2000_reg_write(IXP2000_GPIO_FEDR, GPIO_IRQ_falling_edge);
- ixp2000_reg_write(IXP2000_GPIO_REDR, GPIO_IRQ_rising_edge);
- ixp2000_reg_write(IXP2000_GPIO_LSHR, GPIO_IRQ_level_high);
- ixp2000_reg_write(IXP2000_GPIO_LSLR, GPIO_IRQ_level_low);
- irq_desc[line+IRQ_IXP2000_GPIO0].valid = 0;
- } else if(style == GPIO_IN) {
- ixp2000_reg_write(IXP2000_GPIO_PDCR, (1 << line));
+ update_gpio_int_csrs();
+
+ ixp2000_reg_write(IXP2000_GPIO_PDSR, 1 << line);
+ } else if (direction == GPIO_IN) {
+ ixp2000_reg_write(IXP2000_GPIO_PDCR, 1 << line);
}
-
local_irq_restore(flags);
-}
+}
/*************************************************************************
}
}
+static int ixp2000_GPIO_irq_type(unsigned int irq, unsigned int type)
+{
+ int line = irq - IRQ_IXP2000_GPIO0;
+
+ /*
+ * First, configure this GPIO line as an input.
+ */
+ ixp2000_reg_write(IXP2000_GPIO_PDCR, 1 << line);
+
+ /*
+ * Then, set the proper trigger type.
+ */
+ if (type & IRQT_FALLING)
+ GPIO_IRQ_falling_edge |= 1 << line;
+ else
+ GPIO_IRQ_falling_edge &= ~(1 << line);
+ if (type & IRQT_RISING)
+ GPIO_IRQ_rising_edge |= 1 << line;
+ else
+ GPIO_IRQ_rising_edge &= ~(1 << line);
+ if (type & IRQT_LOW)
+ GPIO_IRQ_level_low |= 1 << line;
+ else
+ GPIO_IRQ_level_low &= ~(1 << line);
+ if (type & IRQT_HIGH)
+ GPIO_IRQ_level_high |= 1 << line;
+ else
+ GPIO_IRQ_level_high &= ~(1 << line);
+ update_gpio_int_csrs();
+
+ /*
+ * Finally, mark the corresponding IRQ as valid.
+ */
+ irq_desc[irq].valid = 1;
+
+ return 0;
+}
+
static void ixp2000_GPIO_irq_mask_ack(unsigned int irq)
{
ixp2000_reg_write(IXP2000_GPIO_INCR, (1 << (irq - IRQ_IXP2000_GPIO0)));
+
+ ixp2000_reg_write(IXP2000_GPIO_EDSR, (1 << (irq - IRQ_IXP2000_GPIO0)));
+ ixp2000_reg_write(IXP2000_GPIO_LDSR, (1 << (irq - IRQ_IXP2000_GPIO0)));
ixp2000_reg_write(IXP2000_GPIO_INST, (1 << (irq - IRQ_IXP2000_GPIO0)));
}
}
static struct irqchip ixp2000_GPIO_irq_chip = {
+ .type = ixp2000_GPIO_irq_type,
.ack = ixp2000_GPIO_irq_mask_ack,
.mask = ixp2000_GPIO_irq_mask,
.unmask = ixp2000_GPIO_irq_unmask
static void ixp2000_irq_unmask(unsigned int irq)
{
- ixp2000_reg_write(IXP2000_IRQ_ENABLE_SET, (1 << irq));
+ ixp2000_reg_write(IXP2000_IRQ_ENABLE_SET, (1 << irq));
}
static struct irqchip ixp2000_irq_chip = {
* our mask/unmask code much simpler.
*/
for (irq = IRQ_IXP2000_SOFT_INT; irq <= IRQ_IXP2000_THDB3; irq++) {
- if((1 << irq) & IXP2000_VALID_IRQ_MASK) {
+ if ((1 << irq) & IXP2000_VALID_IRQ_MASK) {
set_irq_chip(irq, &ixp2000_irq_chip);
set_irq_handler(irq, do_level_IRQ);
set_irq_flags(irq, IRQF_VALID);
} else set_irq_flags(irq, 0);
}
-
+
/*
* GPIO IRQs are invalid until someone sets the interrupt mode
- * by calling gpio_line_set();
+ * by calling set_irq_type().
*/
for (irq = IRQ_IXP2000_GPIO0; irq <= IRQ_IXP2000_GPIO7; irq++) {
set_irq_chip(irq, &ixp2000_GPIO_irq_chip);
projects / powerpc.git / blobdiff