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tty/serial: convert 8250 to generic earlycon
With the generic earlycon infrastructure in place, convert the 8250 early console to use it. Signed-off-by: Rob Herring <robh@kernel.org> Cc: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rob Herring
Greg Kroah-Hartman
parent
9aac588759
commit
d2fd6810a8
2 changed files with 17 additions and 124 deletions
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@ -35,18 +35,8 @@
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#include <linux/serial_8250.h>
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#include <asm/io.h>
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#include <asm/serial.h>
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#ifdef CONFIG_FIX_EARLYCON_MEM
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#include <asm/pgtable.h>
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#include <asm/fixmap.h>
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#endif
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struct early_serial8250_device {
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struct uart_port port;
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char options[16]; /* e.g., 115200n8 */
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unsigned int baud;
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};
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static struct early_serial8250_device early_device;
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static struct earlycon_device *early_device;
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unsigned int __weak __init serial8250_early_in(struct uart_port *port, int offset)
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{
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@ -100,7 +90,7 @@ static void __init serial_putc(struct uart_port *port, int c)
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static void __init early_serial8250_write(struct console *console,
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const char *s, unsigned int count)
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{
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struct uart_port *port = &early_device.port;
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struct uart_port *port = &early_device->port;
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unsigned int ier;
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/* Save the IER and disable interrupts */
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@ -129,7 +119,7 @@ static unsigned int __init probe_baud(struct uart_port *port)
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return (port->uartclk / 16) / quot;
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}
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static void __init init_port(struct early_serial8250_device *device)
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static void __init init_port(struct earlycon_device *device)
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{
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struct uart_port *port = &device->port;
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unsigned int divisor;
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@ -148,128 +138,32 @@ static void __init init_port(struct early_serial8250_device *device)
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serial8250_early_out(port, UART_LCR, c & ~UART_LCR_DLAB);
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}
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static int __init parse_options(struct early_serial8250_device *device,
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char *options)
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static int __init early_serial8250_setup(struct earlycon_device *device,
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const char *options)
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{
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struct uart_port *port = &device->port;
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int mmio, mmio32, length;
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if (!options)
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return -ENODEV;
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port->uartclk = BASE_BAUD * 16;
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mmio = !strncmp(options, "mmio,", 5);
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mmio32 = !strncmp(options, "mmio32,", 7);
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if (mmio || mmio32) {
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port->iotype = (mmio ? UPIO_MEM : UPIO_MEM32);
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port->mapbase = simple_strtoul(options + (mmio ? 5 : 7),
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&options, 0);
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if (mmio32)
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port->regshift = 2;
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#ifdef CONFIG_FIX_EARLYCON_MEM
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set_fixmap_nocache(FIX_EARLYCON_MEM_BASE,
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port->mapbase & PAGE_MASK);
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port->membase =
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(void __iomem *)__fix_to_virt(FIX_EARLYCON_MEM_BASE);
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port->membase += port->mapbase & ~PAGE_MASK;
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#else
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port->membase = ioremap_nocache(port->mapbase, 64);
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if (!port->membase) {
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printk(KERN_ERR "%s: Couldn't ioremap 0x%llx\n",
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__func__,
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(unsigned long long) port->mapbase);
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return -ENOMEM;
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}
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#endif
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} else if (!strncmp(options, "io,", 3)) {
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port->iotype = UPIO_PORT;
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port->iobase = simple_strtoul(options + 3, &options, 0);
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mmio = 0;
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} else
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return -EINVAL;
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options = strchr(options, ',');
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if (options) {
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options++;
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device->baud = simple_strtoul(options, NULL, 0);
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length = min(strcspn(options, " ") + 1,
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(size_t)(sizeof(device->options)));
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strlcpy(device->options, options, length);
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} else {
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device->baud = probe_baud(port);
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snprintf(device->options, sizeof(device->options), "%u",
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device->baud);
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}
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if (mmio || mmio32)
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printk(KERN_INFO
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"Early serial console at MMIO%s 0x%llx (options '%s')\n",
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mmio32 ? "32" : "",
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(unsigned long long)port->mapbase,
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device->options);
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else
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printk(KERN_INFO
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"Early serial console at I/O port 0x%lx (options '%s')\n",
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port->iobase,
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device->options);
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return 0;
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}
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static struct console early_serial8250_console __initdata = {
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.name = "uart",
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.write = early_serial8250_write,
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.flags = CON_PRINTBUFFER | CON_BOOT,
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.index = -1,
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};
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static int __init early_serial8250_setup(char *options)
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{
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struct early_serial8250_device *device = &early_device;
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int err;
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if (device->port.membase || device->port.iobase)
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if (!(device->port.membase || device->port.iobase))
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return 0;
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err = parse_options(device, options);
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if (err < 0)
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return err;
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if (!device->baud)
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device->baud = probe_baud(&device->port);
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init_port(device);
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early_device = device;
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device->con->write = early_serial8250_write;
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return 0;
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}
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int __init setup_early_serial8250_console(char *cmdline)
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{
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char *options;
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int err;
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options = strstr(cmdline, "uart8250,");
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if (!options) {
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options = strstr(cmdline, "uart,");
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if (!options)
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return 0;
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}
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options = strchr(cmdline, ',') + 1;
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err = early_serial8250_setup(options);
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if (err < 0)
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return err;
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register_console(&early_serial8250_console);
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return 0;
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}
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EARLYCON_DECLARE(uart8250, early_serial8250_setup);
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EARLYCON_DECLARE(uart, early_serial8250_setup);
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int serial8250_find_port_for_earlycon(void)
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{
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struct early_serial8250_device *device = &early_device;
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struct uart_port *port = &device->port;
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struct earlycon_device *device = early_device;
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struct uart_port *port = device ? &device->port : NULL;
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int line;
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int ret;
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if (!device->port.membase && !device->port.iobase)
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if (!port || (!port->membase && !port->iobase))
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return -ENODEV;
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line = serial8250_find_port(port);
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@ -284,5 +178,3 @@ int serial8250_find_port_for_earlycon(void)
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return ret;
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}
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early_param("earlycon", setup_early_serial8250_console);
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@ -61,6 +61,7 @@ config SERIAL_8250_CONSOLE
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bool "Console on 8250/16550 and compatible serial port"
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depends on SERIAL_8250=y
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select SERIAL_CORE_CONSOLE
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select SERIAL_EARLYCON
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---help---
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If you say Y here, it will be possible to use a serial port as the
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system console (the system console is the device which receives all
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