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| author | Rob Herring <robh@kernel.org> | 2014-03-27 08:06:16 -0500 |
|---|---|---|
| committer | Rob Herring <robh@kernel.org> | 2014-05-20 15:19:25 -0500 |
| commit | b0b6abd34c1b508d4ac95dbc614f36c49d29e65a (patch) | |
| tree | 153b298e55c0ba79dc0ff1ad7f3d308f8d9ed32f | |
| parent | 54196ccbe0ba1f268a646059473313589db35b01 (diff) | |
| download | linux-b0b6abd34c1b508d4ac95dbc614f36c49d29e65a.tar.gz linux-b0b6abd34c1b508d4ac95dbc614f36c49d29e65a.tar.bz2 linux-b0b6abd34c1b508d4ac95dbc614f36c49d29e65a.zip | |
serial: earlycon: add DT support
This adds the infrastructure to generic earlycon for earlycon setup
using DT. The actual setup is not enabled until a following commit to
add the FDT parsing.
Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: Grant Likely <grant.likely@linaro.org>
| -rw-r--r-- | drivers/tty/serial/earlycon.c | 28 | ||||
| -rw-r--r-- | include/asm-generic/vmlinux.lds.h | 4 | ||||
| -rw-r--r-- | include/linux/serial_core.h | 6 |
3 files changed, 37 insertions, 1 deletions
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index c92e83088adb..5131b5ee6164 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -15,6 +15,8 @@ #include <linux/init.h> #include <linux/io.h> #include <linux/serial_core.h> +#include <linux/sizes.h> +#include <linux/mod_devicetable.h> #ifdef CONFIG_FIX_EARLYCON_MEM #include <asm/fixmap.h> @@ -32,6 +34,9 @@ static struct earlycon_device early_console_dev = { .con = &early_con, }; +static const struct of_device_id __earlycon_of_table_sentinel + __used __section(__earlycon_of_table_end); + static void __iomem * __init earlycon_map(unsigned long paddr, size_t size) { void __iomem *base; @@ -142,3 +147,26 @@ int __init setup_earlycon(char *buf, const char *match, register_console(early_console_dev.con); return 0; } + +int __init of_setup_earlycon(unsigned long addr, + int (*setup)(struct earlycon_device *, const char *)) +{ + int err; + struct uart_port *port = &early_console_dev.port; + + port->iotype = UPIO_MEM; + port->mapbase = addr; + port->uartclk = BASE_BAUD * 16; + port->membase = earlycon_map(addr, SZ_4K); + + early_console_dev.con->data = &early_console_dev; + err = setup(&early_console_dev, NULL); + if (err < 0) + return err; + if (!early_console_dev.con->write) + return -ENODEV; + + + register_console(early_console_dev.con); + return 0; +} diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index b9404f6590f1..d647637cd699 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -155,6 +155,7 @@ #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) +#define EARLYCON_OF_TABLES() OF_TABLE(CONFIG_SERIAL_EARLYCON, earlycon) #define KERNEL_DTB() \ STRUCT_ALIGN(); \ @@ -483,7 +484,8 @@ CLKSRC_OF_TABLES() \ CPU_METHOD_OF_TABLES() \ KERNEL_DTB() \ - IRQCHIP_OF_MATCH_TABLE() + IRQCHIP_OF_MATCH_TABLE() \ + EARLYCON_OF_TABLES() #define INIT_TEXT \ *(.init.text) \ diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index 7a15b5b24c0b..5bbb809ee197 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -294,6 +294,9 @@ struct earlycon_device { int setup_earlycon(char *buf, const char *match, int (*setup)(struct earlycon_device *, const char *)); +extern int of_setup_earlycon(unsigned long addr, + int (*setup)(struct earlycon_device *, const char *)); + #define EARLYCON_DECLARE(name, func) \ static int __init name ## _setup_earlycon(char *buf) \ { \ @@ -301,6 +304,9 @@ static int __init name ## _setup_earlycon(char *buf) \ } \ early_param("earlycon", name ## _setup_earlycon); +#define OF_EARLYCON_DECLARE(name, compat, fn) \ + _OF_DECLARE(earlycon, name, compat, fn, void *) + struct uart_port *uart_get_console(struct uart_port *ports, int nr, struct console *c); void uart_parse_options(char *options, int *baud, int *parity, int *bits, |