# HG changeset patch
# User James Mckenzie <jamesmck@xxxxxxxxxxxxxxxxxxxx>
# Date 1310632103 -3600
# Node ID bdd9f31951ad309cf76f701a034dc87c78833a3a
# Parent 80c9db90bba96e443a22d268c06948fdef9c6a75
xen: Automatically find serial port on PCI/PCIe and AMT devices.
Instead of having to manually look the right I/O port on the PCI
devices or AMT devices, lets probe the card and find that
automatically.
This means that you don't have to have this:
com1=115200,8n1,0xd800,0
But instead can have
com1=115200,8n1,magic
Or if you have AMT:
com1=19200,8n1,amt
Signed-off-by: James Mckenzie <jamesmck@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Signed-off-by: Tom Goetz <tom.goetz@xxxxxxxxxxxxxxxxxxx>
---
diff -r 80c9db90bba9 -r bdd9f31951ad xen/drivers/char/ns16550.c
--- a/xen/drivers/char/ns16550.c Thu Jul 14 09:26:13 2011 +0100
+++ b/xen/drivers/char/ns16550.c Thu Jul 14 09:28:23 2011 +0100
@@ -17,6 +17,8 @@
#include <xen/timer.h>
#include <xen/serial.h>
#include <xen/iocap.h>
+#include <xen/pci.h>
+#include <xen/pci_regs.h>
#include <asm/io.h>
/*
@@ -440,6 +442,64 @@
return (status == 0x90);
}
+static int
+magic_uart_config (struct ns16550 *uart,int skip_amt)
+{
+ uint16_t class;
+ uint32_t bar0, len;
+ int b, d, f;
+
+/*Skanky hack - start at bus 1 to avoid AMT, a plug in card cannot be on bus 1
*/
+
+ if (skip_amt) b=1;
+ else b=0;
+
+ for (; b < 0x100; ++b)
+ {
+ for (d = 0; d < 0x20; ++d)
+ {
+ for (f = 0; f < 0x8; ++f)
+ {
+
+ class = pci_conf_read16 (b, d, f, PCI_CLASS_DEVICE);
+ if (class != 0x700)
+ continue;;
+
+ bar0 = pci_conf_read32 (b, d, f, PCI_BASE_ADDRESS_0);
+
+ /* Not IO */
+ if (!(bar0 & 1))
+ continue;
+
+ pci_conf_write32 (b, d, f, PCI_BASE_ADDRESS_0, 0xffffffff);
+ len = pci_conf_read32 (b, d, f, PCI_BASE_ADDRESS_0);
+ pci_conf_write32 (b, d, f, PCI_BASE_ADDRESS_0, bar0);
+
+ /* Not 8 bytes */
+ if ((len & 0xffff) != 0xfff9)
+ continue;
+
+ uart->io_base = bar0 & 0xfffe;
+ uart->irq = 0;
+
+ return 0;
+
+ }
+
+ }
+ }
+
+ if (!skip_amt)
+ return -1;
+
+ uart->io_base = 0x3f8;
+ uart->irq = 0;
+ uart->clock_hz = UART_CLOCK_HZ;
+
+ return 0;
+}
+
+
#define PARSE_ERR(_f, _a...) \
do { \
printk( "ERROR: " _f "\n" , ## _a ); \
@@ -488,7 +548,18 @@
if ( *conf == ',' )
{
conf++;
- uart->io_base = simple_strtoul(conf, &conf, 0);
+
+ if ( strncmp(conf,"magic",5) == 0 ) {
+ if (magic_uart_config(uart,1))
+ return;
+ conf+=5;
+ } else if ( strncmp(conf,"amt",3) == 0 ) {
+ if (magic_uart_config(uart,0))
+ return;
+ conf+=3;
+ } else {
+ uart->io_base = simple_strtoul(conf, &conf, 0);
+ }
if ( *conf == ',' )
{
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