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path: root/drivers/tty/serial/meson_uart.c
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Diffstat (limited to 'drivers/tty/serial/meson_uart.c')
-rw-r--r--drivers/tty/serial/meson_uart.c153
1 files changed, 107 insertions, 46 deletions
diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
index 60f16795d16b..42e4a4c7597f 100644
--- a/drivers/tty/serial/meson_uart.c
+++ b/drivers/tty/serial/meson_uart.c
@@ -286,7 +286,7 @@ static int meson_uart_startup(struct uart_port *port)
writel(val, port->membase + AML_UART_MISC);
ret = request_irq(port->irq, meson_uart_interrupt, 0,
- meson_uart_type(port), port);
+ port->name, port);
return ret;
}
@@ -298,8 +298,6 @@ static void meson_uart_change_speed(struct uart_port *port, unsigned long baud)
while (!meson_uart_tx_empty(port))
cpu_relax();
- val = readl(port->membase + AML_UART_REG5);
- val &= ~AML_UART_BAUD_MASK;
if (port->uartclk == 24000000) {
val = ((port->uartclk / 3) / baud) - 1;
val |= AML_UART_BAUD_XTAL;
@@ -355,7 +353,7 @@ static void meson_uart_set_termios(struct uart_port *port,
if (cflags & CSTOPB)
val |= AML_UART_STOP_BIN_2SB;
else
- val &= ~AML_UART_STOP_BIN_1SB;
+ val |= AML_UART_STOP_BIN_1SB;
if (cflags & CRTSCTS)
val &= ~AML_UART_TWO_WIRE_EN;
@@ -395,51 +393,25 @@ static int meson_uart_verify_port(struct uart_port *port,
return ret;
}
-static int meson_uart_res_size(struct uart_port *port)
-{
- struct platform_device *pdev = to_platform_device(port->dev);
- struct resource *res;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- dev_err(port->dev, "cannot obtain I/O memory region");
- return -ENODEV;
- }
-
- return resource_size(res);
-}
-
static void meson_uart_release_port(struct uart_port *port)
{
- int size = meson_uart_res_size(port);
-
- if (port->flags & UPF_IOREMAP) {
- devm_release_mem_region(port->dev, port->mapbase, size);
- devm_iounmap(port->dev, port->membase);
- port->membase = NULL;
- }
+ devm_iounmap(port->dev, port->membase);
+ port->membase = NULL;
+ devm_release_mem_region(port->dev, port->mapbase, port->mapsize);
}
static int meson_uart_request_port(struct uart_port *port)
{
- int size = meson_uart_res_size(port);
-
- if (size < 0)
- return size;
-
- if (!devm_request_mem_region(port->dev, port->mapbase, size,
+ if (!devm_request_mem_region(port->dev, port->mapbase, port->mapsize,
dev_name(port->dev))) {
dev_err(port->dev, "Memory region busy\n");
return -EBUSY;
}
- if (port->flags & UPF_IOREMAP) {
- port->membase = devm_ioremap_nocache(port->dev,
- port->mapbase,
- size);
- if (port->membase == NULL)
- return -ENOMEM;
- }
+ port->membase = devm_ioremap_nocache(port->dev, port->mapbase,
+ port->mapsize);
+ if (!port->membase)
+ return -ENOMEM;
return 0;
}
@@ -470,6 +442,14 @@ static struct uart_ops meson_uart_ops = {
};
#ifdef CONFIG_SERIAL_MESON_CONSOLE
+static void meson_uart_enable_tx_engine(struct uart_port *port)
+{
+ u32 val;
+
+ val = readl(port->membase + AML_UART_CONTROL);
+ val |= AML_UART_TX_EN;
+ writel(val, port->membase + AML_UART_CONTROL);
+}
static void meson_console_putchar(struct uart_port *port, int ch)
{
@@ -499,7 +479,6 @@ static void meson_serial_port_write(struct uart_port *port, const char *s,
}
val = readl(port->membase + AML_UART_CONTROL);
- val |= AML_UART_TX_EN;
tmp = val & ~(AML_UART_TX_INT_EN | AML_UART_RX_INT_EN);
writel(tmp, port->membase + AML_UART_CONTROL);
@@ -538,6 +517,8 @@ static int meson_serial_console_setup(struct console *co, char *options)
if (!port || !port->membase)
return -ENODEV;
+ meson_uart_enable_tx_engine(port);
+
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
@@ -576,11 +557,16 @@ meson_serial_early_console_setup(struct earlycon_device *device, const char *opt
if (!device->port.membase)
return -ENODEV;
+ meson_uart_enable_tx_engine(&device->port);
device->con->write = meson_serial_early_console_write;
return 0;
}
+/* Legacy bindings, should be removed when no more used */
OF_EARLYCON_DECLARE(meson, "amlogic,meson-uart",
meson_serial_early_console_setup);
+/* Stable bindings */
+OF_EARLYCON_DECLARE(meson, "amlogic,meson-ao-uart",
+ meson_serial_early_console_setup);
#define MESON_SERIAL_CONSOLE (&meson_serial_console)
#else
@@ -595,11 +581,76 @@ static struct uart_driver meson_uart_driver = {
.cons = MESON_SERIAL_CONSOLE,
};
+static inline struct clk *meson_uart_probe_clock(struct device *dev,
+ const char *id)
+{
+ struct clk *clk = NULL;
+ int ret;
+
+ clk = devm_clk_get(dev, id);
+ if (IS_ERR(clk))
+ return clk;
+
+ ret = clk_prepare_enable(clk);
+ if (ret) {
+ dev_err(dev, "couldn't enable clk\n");
+ return ERR_PTR(ret);
+ }
+
+ devm_add_action_or_reset(dev,
+ (void(*)(void *))clk_disable_unprepare,
+ clk);
+
+ return clk;
+}
+
+/*
+ * This function gets clocks in the legacy non-stable DT bindings.
+ * This code will be remove once all the platforms switch to the
+ * new DT bindings.
+ */
+static int meson_uart_probe_clocks_legacy(struct platform_device *pdev,
+ struct uart_port *port)
+{
+ struct clk *clk = NULL;
+
+ clk = meson_uart_probe_clock(&pdev->dev, NULL);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ port->uartclk = clk_get_rate(clk);
+
+ return 0;
+}
+
+static int meson_uart_probe_clocks(struct platform_device *pdev,
+ struct uart_port *port)
+{
+ struct clk *clk_xtal = NULL;
+ struct clk *clk_pclk = NULL;
+ struct clk *clk_baud = NULL;
+
+ clk_pclk = meson_uart_probe_clock(&pdev->dev, "pclk");
+ if (IS_ERR(clk_pclk))
+ return PTR_ERR(clk_pclk);
+
+ clk_xtal = meson_uart_probe_clock(&pdev->dev, "xtal");
+ if (IS_ERR(clk_xtal))
+ return PTR_ERR(clk_xtal);
+
+ clk_baud = meson_uart_probe_clock(&pdev->dev, "baud");
+ if (IS_ERR(clk_baud))
+ return PTR_ERR(clk_baud);
+
+ port->uartclk = clk_get_rate(clk_baud);
+
+ return 0;
+}
+
static int meson_uart_probe(struct platform_device *pdev)
{
struct resource *res_mem, *res_irq;
struct uart_port *port;
- struct clk *clk;
int ret = 0;
if (pdev->dev.of_node)
@@ -625,15 +676,20 @@ static int meson_uart_probe(struct platform_device *pdev)
if (!port)
return -ENOMEM;
- clk = clk_get(&pdev->dev, NULL);
- if (IS_ERR(clk))
- return PTR_ERR(clk);
+ /* Use legacy way until all platforms switch to new bindings */
+ if (of_device_is_compatible(pdev->dev.of_node, "amlogic,meson-uart"))
+ ret = meson_uart_probe_clocks_legacy(pdev, port);
+ else
+ ret = meson_uart_probe_clocks(pdev, port);
+
+ if (ret)
+ return ret;
- port->uartclk = clk_get_rate(clk);
port->iotype = UPIO_MEM;
port->mapbase = res_mem->start;
+ port->mapsize = resource_size(res_mem);
port->irq = res_irq->start;
- port->flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_LOW_LATENCY;
+ port->flags = UPF_BOOT_AUTOCONF | UPF_LOW_LATENCY;
port->dev = &pdev->dev;
port->line = pdev->id;
port->type = PORT_MESON;
@@ -668,9 +724,14 @@ static int meson_uart_remove(struct platform_device *pdev)
return 0;
}
-
static const struct of_device_id meson_uart_dt_match[] = {
+ /* Legacy bindings, should be removed when no more used */
{ .compatible = "amlogic,meson-uart" },
+ /* Stable bindings */
+ { .compatible = "amlogic,meson6-uart" },
+ { .compatible = "amlogic,meson8-uart" },
+ { .compatible = "amlogic,meson8b-uart" },
+ { .compatible = "amlogic,meson-gx-uart" },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, meson_uart_dt_match);