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Date: Sat, 26 Jun 2010 04:05:16 +0400
From: Samium Gromoff <_deepfire@...lingofgreen.ru>
To: linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: MMIO32 support for 8250_early.c
> This should be fairly uncontroversial, but YMMV.
>
> Available from master branch at git://git.feelingofgreen.ru/linux
The above branch is updated with a fix to the {write,read}{w => l} SNAFU.
--
regards,
Samium Gromoff
--
"Actually I made up the term 'object-oriented', and I can tell you I
did not have C++ in mind." - Alan Kay (OOPSLA 1997 Keynote)
--
commit a2a626116235af5c8135ae427240a8371aed27f3
Author: Samium Gromoff <deepfire@...ees.com>
Date: Sat Jun 26 05:26:03 2010 +0400
Provide MMIO32 support in 8250_early (aka earlycon)
diff --git a/drivers/serial/8250_early.c b/drivers/serial/8250_early.c
index f279745..421fc57 100644
--- a/drivers/serial/8250_early.c
+++ b/drivers/serial/8250_early.c
@@ -48,18 +48,31 @@ static struct early_serial8250_device early_device;
static unsigned int __init serial_in(struct uart_port *port, int offset)
{
- if (port->iotype == UPIO_MEM)
- return readb(port->membase + offset);
- else
- return inb(port->iobase + offset);
+ switch (port->iotype) {
+ case UPIO_MEM:
+ return readb(port->membase + offset);
+ case UPIO_MEM32:
+ return readl(port->membase + (offset << 2));
+ case UPIO_PORT:
+ return inb(port->iobase + offset);
+ default:
+ return 0;
+ }
}
static void __init serial_out(struct uart_port *port, int offset, int value)
{
- if (port->iotype == UPIO_MEM)
- writeb(value, port->membase + offset);
- else
- outb(value, port->iobase + offset);
+ switch (port->iotype) {
+ case UPIO_MEM:
+ writeb(value, port->membase + offset);
+ break;
+ case UPIO_MEM32:
+ writel(value, port->membase + (offset << 2));
+ break;
+ case UPIO_PORT:
+ outb(value, port->iobase + offset);
+ break;
+ }
}
#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
@@ -137,15 +150,20 @@ static int __init parse_options(struct early_serial8250_device *device,
char *options)
{
struct uart_port *port = &device->port;
- int mmio, length;
+ int mmio, mmio32, length;
if (!options)
return -ENODEV;
port->uartclk = BASE_BAUD * 16;
- if (!strncmp(options, "mmio,", 5)) {
- port->iotype = UPIO_MEM;
- port->mapbase = simple_strtoul(options + 5, &options, 0);
+
+ 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);
@@ -161,7 +179,6 @@ static int __init parse_options(struct early_serial8250_device *device,
return -ENOMEM;
}
#endif
- mmio = 1;
} else if (!strncmp(options, "io,", 3)) {
port->iotype = UPIO_PORT;
port->iobase = simple_strtoul(options + 3, &options, 0);
@@ -182,9 +199,9 @@ static int __init parse_options(struct early_serial8250_device *device,
}
printk(KERN_INFO "Early serial console at %s 0x%llx (options '%s')\n",
- mmio ? "MMIO" : "I/O port",
- mmio ? (unsigned long long) port->mapbase
- : (unsigned long long) port->iobase,
+ mmio ? "MMIO" : mmio32 ? "MMIO32" : "I/O port",
+ (mmio | mmio32) ? (unsigned long long) port->mapbase
+ : (unsigned long long) port->iobase,
device->options);
return 0;
}
--
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