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NVIDIA: SAUCE: tty/serial: tegra-utc: Add support for earlycon

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Add support for earlycon in Tegra UTC driver.

http://nvbugs/4593743

Signed-off-by: Kartik <kkartik@nvidia.com>
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Acked-by: Noah Wager <noah.wager@canonical.com>
Acked-by: Jacob Martin <jacob.martin@canonical.com>
Signed-off-by: Noah Wager <noah.wager@canonical.com>
This commit is contained in:
Kartik
2024-04-10 17:54:02 +00:00
committed by Noah Wager
parent 4826884dbd
commit 16fceb13b1
1 changed files with 41 additions and 0 deletions
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drivers/tty/serial/tegra-utc.c
+41
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@@ -406,6 +406,47 @@ static void tegra_utc_setup_port(struct device *dev, struct tegra_utc_port *tup,
}
#if IS_ENABLED(CONFIG_SERIAL_TEGRA_UTC_CONSOLE)
static void tegra_utc_putc(struct uart_port *port, unsigned char c)
{
writel(c, port->membase + TEGRA_UTC_DATA);
}
static void tegra_utc_early_write(struct console *con, const char *s, unsigned int n)
{
struct earlycon_device *dev = con->data;
while (n) {
unsigned int burst_size = TEGRA_UTC_CLIENT_FIFO_SIZE;
burst_size -= readl(dev->port.membase + TEGRA_UTC_FIFO_OCCUPANCY);
if (n < burst_size)
burst_size = n;
uart_console_write(&dev->port, s, burst_size, tegra_utc_putc);
n -= burst_size;
s += burst_size;
}
}
static int __init tegra_utc_early_console_setup(struct earlycon_device *device, const char *opt)
{
if (!device->port.membase)
return -ENODEV;
writel(0x11, device->port.membase + TEGRA_UTC_COMMAND);
writel(0x4, device->port.membase + TEGRA_UTC_FIFO_THRESHOLD);
writel(0xf, device->port.membase + TEGRA_UTC_INTR_CLEAR);
writel(0x0, device->port.membase + TEGRA_UTC_INTR_MASK);
writel(0x0, device->port.membase + TEGRA_UTC_INTR_SET);
writel(0x1, device->port.membase + TEGRA_UTC_ENABLE);
device->con->write = tegra_utc_early_write;
return 0;
}
OF_EARLYCON_DECLARE(tegra_utc, "nvidia,tegra-utc", tegra_utc_early_console_setup);
static void tegra_utc_console_putchar(struct uart_port *port, unsigned char ch)
{
struct tegra_utc_port *tup = container_of(port, struct tegra_utc_port, port);