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path: root/drivers/tty/serial/8250
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Diffstat (limited to 'drivers/tty/serial/8250')
-rw-r--r--drivers/tty/serial/8250/8250_core.c5
-rw-r--r--drivers/tty/serial/8250/8250_dw.c81
-rw-r--r--drivers/tty/serial/8250/8250_early.c138
-rw-r--r--drivers/tty/serial/8250/Kconfig6
4 files changed, 98 insertions, 132 deletions
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 2d4bd3929e50..053c2007b054 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -1926,13 +1926,8 @@ static void serial8250_put_poll_char(struct uart_port *port,
wait_for_xmitr(up, BOTH_EMPTY);
/*
* Send the character out.
- * If a LF, also do CR...
*/
serial_port_out(port, UART_TX, c);
- if (c == 10) {
- wait_for_xmitr(up, BOTH_EMPTY);
- serial_port_out(port, UART_TX, 13);
- }
/*
* Finally, wait for transmitter to become empty
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index ed3113576740..51b307aab75e 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -62,6 +62,70 @@ struct dw8250_data {
struct uart_8250_dma dma;
};
+struct dw8250_acpi_desc {
+ void (*set_termios)(struct uart_port *p, struct ktermios *termios,
+ struct ktermios *old);
+};
+
+#define BYT_PRV_CLK 0x800
+#define BYT_PRV_CLK_EN (1 << 0)
+#define BYT_PRV_CLK_M_VAL_SHIFT 1
+#define BYT_PRV_CLK_N_VAL_SHIFT 16
+#define BYT_PRV_CLK_UPDATE (1 << 31)
+
+static void byt_set_termios(struct uart_port *p, struct ktermios *termios,
+ struct ktermios *old)
+{
+ unsigned int baud = tty_termios_baud_rate(termios);
+ unsigned int m, n;
+ u32 reg;
+
+ /*
+ * For baud rates 0.5M, 1M, 1.5M, 2M, 2.5M, 3M, 3.5M and 4M the
+ * dividers must be adjusted.
+ *
+ * uartclk = (m / n) * 100 MHz, where m <= n
+ */
+ switch (baud) {
+ case 500000:
+ case 1000000:
+ case 2000000:
+ case 4000000:
+ m = 64;
+ n = 100;
+ p->uartclk = 64000000;
+ break;
+ case 3500000:
+ m = 56;
+ n = 100;
+ p->uartclk = 56000000;
+ break;
+ case 1500000:
+ case 3000000:
+ m = 48;
+ n = 100;
+ p->uartclk = 48000000;
+ break;
+ case 2500000:
+ m = 40;
+ n = 100;
+ p->uartclk = 40000000;
+ break;
+ default:
+ m = 2304;
+ n = 3125;
+ p->uartclk = 73728000;
+ }
+
+ /* Reset the clock */
+ reg = (m << BYT_PRV_CLK_M_VAL_SHIFT) | (n << BYT_PRV_CLK_N_VAL_SHIFT);
+ writel(reg, p->membase + BYT_PRV_CLK);
+ reg |= BYT_PRV_CLK_EN | BYT_PRV_CLK_UPDATE;
+ writel(reg, p->membase + BYT_PRV_CLK);
+
+ serial8250_do_set_termios(p, termios, old);
+}
+
static inline int dw8250_modify_msr(struct uart_port *p, int offset, int value)
{
struct dw8250_data *d = p->private_data;
@@ -278,6 +342,7 @@ static int dw8250_probe_acpi(struct uart_8250_port *up,
{
const struct acpi_device_id *id;
struct uart_port *p = &up->port;
+ struct dw8250_acpi_desc *acpi_desc;
dw8250_setup_port(up);
@@ -290,14 +355,18 @@ static int dw8250_probe_acpi(struct uart_8250_port *up,
p->serial_out = dw8250_serial_out32;
p->regshift = 2;
- if (!p->uartclk)
- p->uartclk = (unsigned int)id->driver_data;
-
up->dma = &data->dma;
up->dma->rxconf.src_maxburst = p->fifosize / 4;
up->dma->txconf.dst_maxburst = p->fifosize / 4;
+ acpi_desc = (struct dw8250_acpi_desc *)id->driver_data;
+ if (!acpi_desc)
+ return 0;
+
+ if (acpi_desc->set_termios)
+ p->set_termios = acpi_desc->set_termios;
+
return 0;
}
@@ -445,12 +514,16 @@ static const struct of_device_id dw8250_of_match[] = {
};
MODULE_DEVICE_TABLE(of, dw8250_of_match);
+static struct dw8250_acpi_desc byt_8250_desc = {
+ .set_termios = byt_set_termios,
+};
+
static const struct acpi_device_id dw8250_acpi_match[] = {
{ "INT33C4", 0 },
{ "INT33C5", 0 },
{ "INT3434", 0 },
{ "INT3435", 0 },
- { "80860F0A", 0 },
+ { "80860F0A", (kernel_ulong_t)&byt_8250_desc},
{ },
};
MODULE_DEVICE_TABLE(acpi, dw8250_acpi_match);
diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
index c100d6343d50..cfef801a49d4 100644
--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c
@@ -35,18 +35,8 @@
#include <linux/serial_8250.h>
#include <asm/io.h>
#include <asm/serial.h>
-#ifdef CONFIG_FIX_EARLYCON_MEM
-#include <asm/pgtable.h>
-#include <asm/fixmap.h>
-#endif
-struct early_serial8250_device {
- struct uart_port port;
- char options[16]; /* e.g., 115200n8 */
- unsigned int baud;
-};
-
-static struct early_serial8250_device early_device;
+static struct earlycon_device *early_device;
unsigned int __weak __init serial8250_early_in(struct uart_port *port, int offset)
{
@@ -100,7 +90,7 @@ static void __init serial_putc(struct uart_port *port, int c)
static void __init early_serial8250_write(struct console *console,
const char *s, unsigned int count)
{
- struct uart_port *port = &early_device.port;
+ struct uart_port *port = &early_device->port;
unsigned int ier;
/* Save the IER and disable interrupts */
@@ -129,7 +119,7 @@ static unsigned int __init probe_baud(struct uart_port *port)
return (port->uartclk / 16) / quot;
}
-static void __init init_port(struct early_serial8250_device *device)
+static void __init init_port(struct earlycon_device *device)
{
struct uart_port *port = &device->port;
unsigned int divisor;
@@ -148,128 +138,42 @@ static void __init init_port(struct early_serial8250_device *device)
serial8250_early_out(port, UART_LCR, c & ~UART_LCR_DLAB);
}
-static int __init parse_options(struct early_serial8250_device *device,
- char *options)
+static int __init early_serial8250_setup(struct earlycon_device *device,
+ const char *options)
{
- struct uart_port *port = &device->port;
- int mmio, mmio32, length;
-
- if (!options)
- return -ENODEV;
-
- port->uartclk = BASE_BAUD * 16;
-
- mmio = !strncmp(options, "mmio,", 5);
- mmio32 = !strncmp(options, "mmio32,", 7);
- if (mmio || mmio32) {
- port->iotype = (mmio ? UPIO_MEM : UPIO_MEM32);
- port->mapbase = simple_strtoul(options + (mmio ? 5 : 7),
- &options, 0);
- if (mmio32)
- port->regshift = 2;
-#ifdef CONFIG_FIX_EARLYCON_MEM
- set_fixmap_nocache(FIX_EARLYCON_MEM_BASE,
- port->mapbase & PAGE_MASK);
- port->membase =
- (void __iomem *)__fix_to_virt(FIX_EARLYCON_MEM_BASE);
- port->membase += port->mapbase & ~PAGE_MASK;
-#else
- port->membase = ioremap_nocache(port->mapbase, 64);
- if (!port->membase) {
- printk(KERN_ERR "%s: Couldn't ioremap 0x%llx\n",
- __func__,
- (unsigned long long) port->mapbase);
- return -ENOMEM;
- }
-#endif
- } else if (!strncmp(options, "io,", 3)) {
- port->iotype = UPIO_PORT;
- port->iobase = simple_strtoul(options + 3, &options, 0);
- mmio = 0;
- } else
- return -EINVAL;
-
- options = strchr(options, ',');
- if (options) {
- options++;
- device->baud = simple_strtoul(options, NULL, 0);
- length = min(strcspn(options, " ") + 1,
- (size_t)(sizeof(device->options)));
- strlcpy(device->options, options, length);
- } else {
- device->baud = probe_baud(port);
- snprintf(device->options, sizeof(device->options), "%u",
- device->baud);
- }
-
- if (mmio || mmio32)
- printk(KERN_INFO
- "Early serial console at MMIO%s 0x%llx (options '%s')\n",
- mmio32 ? "32" : "",
- (unsigned long long)port->mapbase,
- device->options);
- else
- printk(KERN_INFO
- "Early serial console at I/O port 0x%lx (options '%s')\n",
- port->iobase,
- device->options);
-
- return 0;
-}
-
-static struct console early_serial8250_console __initdata = {
- .name = "uart",
- .write = early_serial8250_write,
- .flags = CON_PRINTBUFFER | CON_BOOT,
- .index = -1,
-};
-
-static int __init early_serial8250_setup(char *options)
-{
- struct early_serial8250_device *device = &early_device;
- int err;
-
- if (device->port.membase || device->port.iobase)
+ if (!(device->port.membase || device->port.iobase))
return 0;
- err = parse_options(device, options);
- if (err < 0)
- return err;
+ if (!device->baud)
+ device->baud = probe_baud(&device->port);
init_port(device);
+
+ early_device = device;
+ device->con->write = early_serial8250_write;
return 0;
}
+EARLYCON_DECLARE(uart8250, early_serial8250_setup);
+EARLYCON_DECLARE(uart, early_serial8250_setup);
int __init setup_early_serial8250_console(char *cmdline)
{
- char *options;
- int err;
+ char match[] = "uart8250";
- options = strstr(cmdline, "uart8250,");
- if (!options) {
- options = strstr(cmdline, "uart,");
- if (!options)
- return 0;
- }
+ if (cmdline && cmdline[4] == ',')
+ match[4] = '\0';
- options = strchr(cmdline, ',') + 1;
- err = early_serial8250_setup(options);
- if (err < 0)
- return err;
-
- register_console(&early_serial8250_console);
-
- return 0;
+ return setup_earlycon(cmdline, match, early_serial8250_setup);
}
int serial8250_find_port_for_earlycon(void)
{
- struct early_serial8250_device *device = &early_device;
- struct uart_port *port = &device->port;
+ struct earlycon_device *device = early_device;
+ struct uart_port *port = device ? &device->port : NULL;
int line;
int ret;
- if (!device->port.membase && !device->port.iobase)
+ if (!port || (!port->membase && !port->iobase))
return -ENODEV;
line = serial8250_find_port(port);
@@ -284,5 +188,3 @@ int serial8250_find_port_for_earlycon(void)
return ret;
}
-
-early_param("earlycon", setup_early_serial8250_console);
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 23329918f229..349ee598b34c 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -61,6 +61,7 @@ config SERIAL_8250_CONSOLE
bool "Console on 8250/16550 and compatible serial port"
depends on SERIAL_8250=y
select SERIAL_CORE_CONSOLE
+ select SERIAL_EARLYCON
---help---
If you say Y here, it will be possible to use a serial port as the
system console (the system console is the device which receives all
@@ -90,11 +91,6 @@ config SERIAL_8250_CONSOLE
If unsure, say N.
-config FIX_EARLYCON_MEM
- bool
- depends on X86
- default y
-
config SERIAL_8250_GSC
tristate
depends on SERIAL_8250 && GSC
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-21 07:12:11 +0000