summaryrefslogtreecommitdiff
path: root/drivers/tty/serial/8250/8250_ingenic.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/tty/serial/8250/8250_ingenic.c')
-rw-r--r--drivers/tty/serial/8250/8250_ingenic.c98
1 files changed, 55 insertions, 43 deletions
diff --git a/drivers/tty/serial/8250/8250_ingenic.c b/drivers/tty/serial/8250/8250_ingenic.c
index 424c07c5f629..94542fc143c2 100644
--- a/drivers/tty/serial/8250/8250_ingenic.c
+++ b/drivers/tty/serial/8250/8250_ingenic.c
@@ -13,7 +13,6 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
-#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/serial_8250.h>
#include <linux/serial_core.h>
@@ -52,9 +51,9 @@ static void early_out(struct uart_port *port, int offset, uint8_t value)
writel(value, port->membase + (offset << 2));
}
-static void ingenic_early_console_putc(struct uart_port *port, int c)
+static void ingenic_early_console_putc(struct uart_port *port, unsigned char c)
{
- uint8_t lsr;
+ u16 lsr;
do {
lsr = early_in(port, UART_LSR);
@@ -87,7 +86,7 @@ static void __init ingenic_early_console_setup_clock(struct earlycon_device *dev
dev->port.uartclk = be32_to_cpup(prop);
}
-static int __init ingenic_early_console_setup(struct earlycon_device *dev,
+static int __init ingenic_earlycon_setup_tail(struct earlycon_device *dev,
const char *opt)
{
struct uart_port *port = &dev->port;
@@ -103,8 +102,6 @@ static int __init ingenic_early_console_setup(struct earlycon_device *dev,
uart_parse_options(opt, &baud, &parity, &bits, &flow);
}
- ingenic_early_console_setup_clock(dev);
-
if (dev->baud)
baud = dev->baud;
divisor = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud);
@@ -129,9 +126,36 @@ static int __init ingenic_early_console_setup(struct earlycon_device *dev,
return 0;
}
+static int __init ingenic_early_console_setup(struct earlycon_device *dev,
+ const char *opt)
+{
+ ingenic_early_console_setup_clock(dev);
+
+ return ingenic_earlycon_setup_tail(dev, opt);
+}
+
+static int __init jz4750_early_console_setup(struct earlycon_device *dev,
+ const char *opt)
+{
+ /*
+ * JZ4750/55/60 have an optional /2 divider between the EXT
+ * oscillator and some peripherals including UART, which will
+ * be enabled if using a 24 MHz oscillator, and disabled when
+ * using a 12 MHz oscillator.
+ */
+ ingenic_early_console_setup_clock(dev);
+ if (dev->port.uartclk >= 16000000)
+ dev->port.uartclk /= 2;
+
+ return ingenic_earlycon_setup_tail(dev, opt);
+}
+
OF_EARLYCON_DECLARE(jz4740_uart, "ingenic,jz4740-uart",
ingenic_early_console_setup);
+OF_EARLYCON_DECLARE(jz4750_uart, "ingenic,jz4750-uart",
+ jz4750_early_console_setup);
+
OF_EARLYCON_DECLARE(jz4770_uart, "ingenic,jz4770-uart",
ingenic_early_console_setup);
@@ -144,9 +168,9 @@ OF_EARLYCON_DECLARE(jz4780_uart, "ingenic,jz4780-uart",
OF_EARLYCON_DECLARE(x1000_uart, "ingenic,x1000-uart",
ingenic_early_console_setup);
-static void ingenic_uart_serial_out(struct uart_port *p, int offset, int value)
+static void ingenic_uart_serial_out(struct uart_port *p, unsigned int offset, u32 value)
{
- int ier;
+ u32 ier;
switch (offset) {
case UART_FCR:
@@ -182,9 +206,9 @@ static void ingenic_uart_serial_out(struct uart_port *p, int offset, int value)
writeb(value, p->membase + (offset << p->regshift));
}
-static unsigned int ingenic_uart_serial_in(struct uart_port *p, int offset)
+static u32 ingenic_uart_serial_in(struct uart_port *p, unsigned int offset)
{
- unsigned int value;
+ u8 value;
value = readb(p->membase + (offset << p->regshift));
@@ -207,22 +231,20 @@ static unsigned int ingenic_uart_serial_in(struct uart_port *p, int offset)
static int ingenic_uart_probe(struct platform_device *pdev)
{
struct uart_8250_port uart = {};
- struct resource *regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- struct resource *irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
struct ingenic_uart_data *data;
const struct ingenic_uart_config *cdata;
- const struct of_device_id *match;
- int err, line;
+ struct resource *regs;
+ int err;
- match = of_match_device(of_match, &pdev->dev);
- if (!match) {
+ cdata = of_device_get_match_data(&pdev->dev);
+ if (!cdata) {
dev_err(&pdev->dev, "Error: No device match found\n");
return -ENODEV;
}
- cdata = match->data;
- if (!regs || !irq) {
- dev_err(&pdev->dev, "no registers/irq defined\n");
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!regs) {
+ dev_err(&pdev->dev, "no registers defined\n");
return -EINVAL;
}
@@ -233,21 +255,19 @@ static int ingenic_uart_probe(struct platform_device *pdev)
spin_lock_init(&uart.port.lock);
uart.port.type = PORT_16550A;
uart.port.flags = UPF_SKIP_TEST | UPF_IOREMAP | UPF_FIXED_TYPE;
- uart.port.iotype = UPIO_MEM;
uart.port.mapbase = regs->start;
- uart.port.regshift = 2;
uart.port.serial_out = ingenic_uart_serial_out;
uart.port.serial_in = ingenic_uart_serial_in;
- uart.port.irq = irq->start;
uart.port.dev = &pdev->dev;
- uart.port.fifosize = cdata->fifosize;
uart.tx_loadsz = cdata->tx_loadsz;
uart.capabilities = UART_CAP_FIFO | UART_CAP_RTOIE;
- /* Check for a fixed line number */
- line = of_alias_get_id(pdev->dev.of_node, "serial");
- if (line >= 0)
- uart.port.line = line;
+ err = uart_read_port_properties(&uart.port);
+ if (err)
+ return err;
+
+ uart.port.regshift = 2;
+ uart.port.fifosize = cdata->fifosize;
uart.port.membase = devm_ioremap(&pdev->dev, regs->start,
resource_size(regs));
@@ -255,22 +275,14 @@ static int ingenic_uart_probe(struct platform_device *pdev)
return -ENOMEM;
data->clk_module = devm_clk_get(&pdev->dev, "module");
- if (IS_ERR(data->clk_module)) {
- err = PTR_ERR(data->clk_module);
- if (err != -EPROBE_DEFER)
- dev_err(&pdev->dev,
- "unable to get module clock: %d\n", err);
- return err;
- }
+ if (IS_ERR(data->clk_module))
+ return dev_err_probe(&pdev->dev, PTR_ERR(data->clk_module),
+ "unable to get module clock\n");
data->clk_baud = devm_clk_get(&pdev->dev, "baud");
- if (IS_ERR(data->clk_baud)) {
- err = PTR_ERR(data->clk_baud);
- if (err != -EPROBE_DEFER)
- dev_err(&pdev->dev,
- "unable to get baud clock: %d\n", err);
- return err;
- }
+ if (IS_ERR(data->clk_baud))
+ return dev_err_probe(&pdev->dev, PTR_ERR(data->clk_baud),
+ "unable to get baud clock\n");
err = clk_prepare_enable(data->clk_module);
if (err) {
@@ -302,14 +314,13 @@ out:
return err;
}
-static int ingenic_uart_remove(struct platform_device *pdev)
+static void ingenic_uart_remove(struct platform_device *pdev)
{
struct ingenic_uart_data *data = platform_get_drvdata(pdev);
serial8250_unregister_port(data->line);
clk_disable_unprepare(data->clk_module);
clk_disable_unprepare(data->clk_baud);
- return 0;
}
static const struct ingenic_uart_config jz4740_uart_config = {
@@ -334,6 +345,7 @@ static const struct ingenic_uart_config x1000_uart_config = {
static const struct of_device_id of_match[] = {
{ .compatible = "ingenic,jz4740-uart", .data = &jz4740_uart_config },
+ { .compatible = "ingenic,jz4750-uart", .data = &jz4760_uart_config },
{ .compatible = "ingenic,jz4760-uart", .data = &jz4760_uart_config },
{ .compatible = "ingenic,jz4770-uart", .data = &jz4760_uart_config },
{ .compatible = "ingenic,jz4775-uart", .data = &jz4760_uart_config },
generated by cgit (git 2.34.1) at 2025-12-29 06:57:23 +0000