New patch to review for coreboot: d075a0b pcengines/apu1: Workaround PCI reset issue [NOTFORMERGE]

[Kyösti Mälkki]

Kyösti Mälkki ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/8330

-gerrit

commit d075a0b50ec5c0d80c0bd34b795bc7b05e200bff
Author: Kyösti Mälkki 
Date:   Wed Jan 28 16:36:28 2015 +0200

pcengines/apu1: Workaround PCI reset issue [NOTFORMERGE]

This patch is extracted from SAGE release pcengines.apu_139_osp.tar.gz.

Change-Id: Ie5653fce2614066f735e497f835c77d09e8b6b22
    Signed-off-by: Kyösti Mälkki 
---
 src/include/reset.h                        |  6 ++++++
 src/southbridge/amd/cimx/sb800/bootblock.c | 16 ++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/src/include/reset.h b/src/include/reset.h
index 9430ffe..56f703d 100644
--- a/src/include/reset.h
+++ b/src/include/reset.h
@@ -10,3 +10,9 @@ void soft_reset(void);
 void cpu_reset(void);

#endif
+
+#define PCI_RESET_REGISTER	0xcf9
+#define  SYS_RST_BIT		(1 << 1)
+#define  RST_CPU_BIT		(1 << 2)
+#define  PCI_COLD_RESET		( SYS_RST_BIT | RST_CPU_BIT )
+#define  PCI_WARM_RESET		RST_CPU_BIT
diff --git a/src/southbridge/amd/cimx/sb800/bootblock.c b/src/southbridge/amd/cimx/sb800/bootblock.c
index 188ba29..b1119cc 100644
--- a/src/southbridge/amd/cimx/sb800/bootblock.c
+++ b/src/southbridge/amd/cimx/sb800/bootblock.c
@@ -18,6 +18,7 @@
  */

#include <arch/io.h>
+#include <reset.h>

static void enable_rom(void)
 {
@@ -111,6 +112,21 @@ static void enable_clocks(void)

static void bootblock_southbridge_init(void)
 {
+	u32 dword;
+	device_t dev;
+
+	/* Check the value of index 0x44 of BDF 0:14.3.
+	 * A non-zero value indicates that a improper reset
+	 * occurred and that a hard-reset should be performed.
+	 */
+	dev = PCI_DEV(0, 0x14, 0x03);
+	dword = pci_io_read_config32(dev, 0x44);
+	if (dword != 0x00000000) {
+		outb( 0x00, PCI_RESET_REGISTER);
+		outb( PCI_COLD_RESET, PCI_RESET_REGISTER);
+		while(1) ;
+	}
+
    /* Setup the rom access for 2M */
    enable_rom();
    enable_prefetch();