[U-Boot] [PATCH v3 08/26] x86: Refactor PCI to permit alternate init
Simon Glass
sjg at chromium.org
Thu Nov 13 06:42:11 CET 2014
We want access PCI earlier in the init sequence, so refactor the code so
that it does not require use of a BSS variable to work. This will allow us
to use early malloc() to store information about a PCI hose.
Common PCI code moves to arch/x86/cpu/pci.c and a new
board_pci_setup_hose() function is provided by boards to set up the (single)
hose used by that board.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
Changes in v3:
- Assign hose->last_busno when calling pci_hose_scan()
- Move pci_setup_type1() call to common pci file
Changes in v2: None
arch/x86/cpu/Makefile | 1 +
arch/x86/cpu/coreboot/pci.c | 22 +++++++---------------
arch/x86/cpu/pci.c | 27 +++++++++++++++++++++++++++
arch/x86/include/asm/pci.h | 11 +++++++++++
4 files changed, 46 insertions(+), 15 deletions(-)
create mode 100644 arch/x86/cpu/pci.c
diff --git a/arch/x86/cpu/Makefile b/arch/x86/cpu/Makefile
index 9d38ef7..97f36d5 100644
--- a/arch/x86/cpu/Makefile
+++ b/arch/x86/cpu/Makefile
@@ -11,3 +11,4 @@
extra-y = start.o
obj-$(CONFIG_X86_RESET_VECTOR) += resetvec.o start16.o
obj-y += interrupts.o cpu.o call64.o
+obj-$(CONFIG_PCI) += pci.o
diff --git a/arch/x86/cpu/coreboot/pci.c b/arch/x86/cpu/coreboot/pci.c
index 33f16a3..4778f71 100644
--- a/arch/x86/cpu/coreboot/pci.c
+++ b/arch/x86/cpu/coreboot/pci.c
@@ -13,8 +13,6 @@
#include <pci.h>
#include <asm/pci.h>
-static struct pci_controller coreboot_hose;
-
static void config_pci_bridge(struct pci_controller *hose, pci_dev_t dev,
struct pci_config_table *table)
{
@@ -31,19 +29,13 @@ static struct pci_config_table pci_coreboot_config_table[] = {
{}
};
-void pci_init_board(void)
+void board_pci_setup_hose(struct pci_controller *hose)
{
- coreboot_hose.config_table = pci_coreboot_config_table;
- coreboot_hose.first_busno = 0;
- coreboot_hose.last_busno = 0;
-
- pci_set_region(coreboot_hose.regions + 0, 0x0, 0x0, 0xffffffff,
- PCI_REGION_MEM);
- coreboot_hose.region_count = 1;
-
- pci_setup_type1(&coreboot_hose);
-
- pci_register_hose(&coreboot_hose);
+ hose->config_table = pci_coreboot_config_table;
+ hose->first_busno = 0;
+ hose->last_busno = 0;
- pci_hose_scan(&coreboot_hose);
+ pci_set_region(hose->regions + 0, 0x0, 0x0, 0xffffffff,
+ PCI_REGION_MEM);
+ hose->region_count = 1;
}
diff --git a/arch/x86/cpu/pci.c b/arch/x86/cpu/pci.c
new file mode 100644
index 0000000..0741dc2
--- /dev/null
+++ b/arch/x86/cpu/pci.c
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2011 The Chromium OS Authors.
+ * (C) Copyright 2008,2009
+ * Graeme Russ, <graeme.russ at gmail.com>
+ *
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB, <daniel at omicron.se>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <pci.h>
+#include <asm/pci.h>
+
+static struct pci_controller x86_hose;
+
+void pci_init_board(void)
+{
+ struct pci_controller *hose = &x86_hose;
+
+ board_pci_setup_hose(hose);
+ pci_setup_type1(hose);
+ pci_register_hose(hose);
+
+ hose->last_busno = pci_hose_scan(hose);
+}
diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index 6b16188..c160707 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -12,5 +12,16 @@
#define DEFINE_PCI_DEVICE_TABLE(_table) \
const struct pci_device_id _table[]
+struct pci_controller;
+
void pci_setup_type1(struct pci_controller *hose);
+
+/**
+ * board_pci_setup_hose() - Set up the PCI hose
+ *
+ * This is called by the common x86 PCI code to set up the PCI controller
+ * hose. It may be called when no memory/BSS is available so should just
+ * store things in 'hose' and not in BSS variables.
+ */
+void board_pci_setup_hose(struct pci_controller *hose);
#endif
--
2.1.0.rc2.206.gedb03e5
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