Messages in this thread Patch in this message | | | Date | Sun, 1 Jan 2006 16:12:21 +0100 | From | Gyorgy Jeney <> | Subject | [patch][rfc] 8250_early: Too early for ioremap |
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From: Gyorgy Jeney
Let the individual architectures define the function to use to remap the mmio- range that will be used by the 8250_early driver. This is needed because, the default, ioremap() is non-functional when the 8250_early driver initialises.
Signed-off-by: Gyorgy Jeney <nog.lkml@gmail.com>
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The 8250_early driver gets used early in the boot process, when the full-blown ioremap() function is still unavailible. The logical looking solution would be to simply s/ioremap/bt_ioremap/, s/iounmap/bt_iounmap/ but the only port in the 2.6.14 kernel that has that function is i386. Those functions look pretty generic so perhaps they could be moved to mm/bootmem.c or something but they rely on fixmap to be availibe which is only availible on 9 out of 25 archs. The best I could come up with is the attached "hack".
Since the mmio code does appear in 8250_early I'm guessing that it works for someone out there, which means this change is wrong.. How do I get 8250_early to use MMIO cleanly?
nog.
--- drivers/serial/8250_early.c 2005-10-28 02:02:08.000000000 +0200 +++ ../../linux-2.6.14/drivers/serial/8250_early.c 2006-01-01 14:40:28.000000000 +0100 @@ -34,6 +34,7 @@ #include <linux/serial.h> #include <asm/io.h> #include <asm/serial.h> +#include <linux/serial_8250.h>
struct early_uart_device { struct uart_port port; @@ -148,7 +149,7 @@ static int __init parse_options(struct e if (!strncmp(options, "mmio,", 5)) { port->iotype = UPIO_MEM; port->mapbase = simple_strtoul(options + 5, &options, 0); - port->membase = ioremap(port->mapbase, mapsize); + port->membase = early_8250_ioremap(port->mapbase, mapsize); if (!port->membase) { printk(KERN_ERR "%s: Couldn't ioremap 0x%lx\n", __FUNCTION__, port->mapbase); @@ -248,7 +249,7 @@ static int __init early_uart_console_swi
unregister_console(&early_uart_console); if (mmio) - iounmap(port->membase); + early_8250_iounmap(port->membase, 64);
return 0; } --- include/linux/serial_8250.h 2005-10-28 02:02:08.000000000 +0200 +++ ../../linux-2.6.14/include/linux/serial_8250.h 2006-01-01 14:42:39.000000000 +0100 @@ -57,4 +57,16 @@ void serial8250_unregister_port(int line void serial8250_suspend_port(int line); void serial8250_resume_port(int line);
+/* + * Default ioremapping functions to use in the 8250_early driver. Individual + * architechtures may override these in include/asm/serial.h (to something more + * sane like bt_io{re,un}map). + */ +#ifndef early_8250_ioremap +#define early_8250_ioremap(addr, len) ioremap(addr, len) +#endif +#ifndef early_8250_iounmap +#define early_8250_iounmap(addr, len) iounmap(addr) +#endif + #endif - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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