arch/arm/mach-omap1/serial.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-omap1/serial.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-omap1/serial.c
Extension
.c
Size
5738 bytes
Lines
247
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

if (!serial_platform_data[i].membase) {
			printk(KERN_ERR "Could not ioremap uart%i\n", i);
			continue;
		}
		switch (i) {
		case 0:
			uart1_ck = clk_get(NULL, "uart1_ck");
			if (IS_ERR(uart1_ck))
				printk("Could not get uart1_ck\n");
			else {
				clk_prepare_enable(uart1_ck);
				if (cpu_is_omap15xx())
					clk_set_rate(uart1_ck, 12000000);
			}
			break;
		case 1:
			uart2_ck = clk_get(NULL, "uart2_ck");
			if (IS_ERR(uart2_ck))
				printk("Could not get uart2_ck\n");
			else {
				clk_prepare_enable(uart2_ck);
				if (cpu_is_omap15xx())
					clk_set_rate(uart2_ck, 12000000);
				else
					clk_set_rate(uart2_ck, 48000000);
			}
			break;
		case 2:
			uart3_ck = clk_get(NULL, "uart3_ck");
			if (IS_ERR(uart3_ck))
				printk("Could not get uart3_ck\n");
			else {
				clk_prepare_enable(uart3_ck);
				if (cpu_is_omap15xx())
					clk_set_rate(uart3_ck, 12000000);
			}
			break;
		}
		omap_serial_reset(&serial_platform_data[i]);
	}
}

#ifdef CONFIG_OMAP_SERIAL_WAKE

static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id)
{
	/* Need to do something with serial port right after wake-up? */
	return IRQ_HANDLED;
}

/*
 * Reroutes serial RX lines to GPIO lines for the duration of
 * sleep to allow waking up the device from serial port even
 * in deep sleep.
 */
void omap_serial_wake_trigger(int enable)
{
	if (!cpu_is_omap16xx())
		return;

	if (uart1_ck != NULL) {
		if (enable)
			omap_cfg_reg(V14_16XX_GPIO37);
		else
			omap_cfg_reg(V14_16XX_UART1_RX);
	}
	if (uart2_ck != NULL) {
		if (enable)
			omap_cfg_reg(R9_16XX_GPIO18);
		else
			omap_cfg_reg(R9_16XX_UART2_RX);
	}
	if (uart3_ck != NULL) {
		if (enable)
			omap_cfg_reg(L14_16XX_GPIO49);
		else
			omap_cfg_reg(L14_16XX_UART3_RX);
	}
}

static void __init omap_serial_set_port_wakeup(int idx)
{
	struct gpio_desc *d;
	int ret;

	d = gpiod_get_index(NULL, "wakeup", idx, GPIOD_IN);
	if (IS_ERR(d)) {
		pr_err("Unable to get UART wakeup GPIO descriptor\n");
		return;
	}

Annotation

Implementation Notes