# HG changeset patch
# User Roger Cruz <roger.cruz@xxxxxxxxxxxxxxxxxxx>
# Date 1310047155 14400
# Node ID 2979bf1b64c492a48ab30f769be37bfa150d6af2
# Parent 8d328f424b554a5714fccc6fd426111bec57a531
xen: Restore the BAR and PCI command after resume.
Certain PCI serial cards just don't want to remember
what they are when they come out of resume. Save
the BAR and the PCI command values before we suspend and
write them back in when we resume.
Signed-off-by: Roger Cruz <roger.cruz@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Tom Goetz <tom.goetz@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
diff -r 8d328f424b55 -r 2979bf1b64c4 xen/drivers/char/ns16550.c
--- a/xen/drivers/char/ns16550.c Thu Jul 07 09:59:14 2011 -0400
+++ b/xen/drivers/char/ns16550.c Thu Jul 07 09:59:15 2011 -0400
@@ -49,6 +49,7 @@ static struct ns16550 {
unsigned int ps_bdf[3]; /* pci serial port BDF */
bool_t pb_bdf_enable; /* if =1, pb-bdf effective, port behind bridge */
bool_t ps_bdf_enable; /* if =1, ps_bdf effective, port on pci card */
+ int bar0, cr;
} ns16550_com[2] = { { 0 } };
/* Register offsets */
@@ -332,8 +333,17 @@ static void __init ns16550_init_postirq(
static void ns16550_resume(struct serial_port *port)
{
+ struct ns16550 *uart = port->uart;
+
ns16550_setup_preirq(port->uart);
ns16550_setup_postirq(port->uart);
+
+ if (uart->bar0) {
+ pci_conf_write32(uart->pb_bdf[0], uart->pb_bdf[1], uart->pb_bdf[2],
+ PCI_BASE_ADDRESS_0, uart->bar0);
+ pci_conf_write32(uart->pb_bdf[0], uart->pb_bdf[1], uart->pb_bdf[2],
+ PCI_COMMAND, uart->cr);
+ }
}
#ifdef CONFIG_X86
@@ -358,6 +368,12 @@ static void ns16550_suspend(struct seria
struct ns16550 *uart = port->uart;
stop_timer(&uart->timer);
+ if (uart->bar0) {
+ uart->bar0 = pci_conf_read32(uart->pb_bdf[0], uart->pb_bdf[1],
uart->pb_bdf[2],
+ PCI_BASE_ADDRESS_0);
+ uart->cr = pci_conf_read32(uart->pb_bdf[0], uart->pb_bdf[1],
uart->pb_bdf[2],
+ PCI_COMMAND);
+ }
}
static struct uart_driver __read_mostly ns16550_driver = {
@@ -480,6 +496,10 @@ magic_uart_config (struct ns16550 *uart,
if ((len & 0xffff) != 0xfff9)
continue;
+ uart->pb_bdf[0] = b;
+ uart->pb_bdf[1] = d;
+ uart->pb_bdf[2] = f;
+ uart->bar0 = bar0;
uart->io_base = bar0 & 0xfffe;
uart->irq = 0;
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
Home