[U-Boot] [PATCH 06/10] MIPS: qemu-malta: add PCI support
Gabor Juhos
juhosg at openwrt.org
Wed Jan 23 18:05:01 CET 2013
Qemu emulates the Galileo GT64120 System Controller
which provides a CPU bus to PCI bus bridge.
The patch adds driver for this bridge and enables
PCI support for the emulated Malta board.
Signed-off-by: Gabor Juhos <juhosg at openwrt.org>
Cc: Daniel Schwierzeck <daniel.schwierzeck at googlemail.com>
---
Changes since RFC:
- use a C struct to define the register layout instead
of using a base address plus offset notation
- remove custom IO accessors
---
board/qemu-malta/Makefile | 5 +-
board/qemu-malta/pci.c | 168 ++++++++++++++++++++++++++++++++++++++++++
include/configs/qemu-malta.h | 6 ++
3 files changed, 178 insertions(+), 1 deletion(-)
create mode 100644 board/qemu-malta/pci.c
diff --git a/board/qemu-malta/Makefile b/board/qemu-malta/Makefile
index 6251bb8..59c1b1d 100644
--- a/board/qemu-malta/Makefile
+++ b/board/qemu-malta/Makefile
@@ -25,7 +25,10 @@ include $(TOPDIR)/config.mk
LIB = $(obj)lib$(BOARD).o
-COBJS = $(BOARD).o
+COBJS-y += $(BOARD).o
+COBJS-$(CONFIG_PCI) += pci.o
+
+COBJS := $(COBJS-y)
SOBJS = lowlevel_init.o
SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c)
diff --git a/board/qemu-malta/pci.c b/board/qemu-malta/pci.c
new file mode 100644
index 0000000..fd9193b
--- /dev/null
+++ b/board/qemu-malta/pci.c
@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) 2013 Gabor Juhos <juhosg at openwrt.org>
+ *
+ * Based on the Linux implementation.
+ * Copyright (C) 1999, 2000, 2004 MIPS Technologies, Inc.
+ * Authors: Carsten Langgaard <carstenl at mips.com>
+ * Maciej W. Rozycki <macro at mips.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <common.h>
+#include <asm/addrspace.h>
+#include <asm/gt64120.h>
+#include <asm/malta.h>
+#include <asm/io.h>
+#include <pci.h>
+
+#define PCI_ACCESS_READ 0
+#define PCI_ACCESS_WRITE 1
+
+struct gt64120_regs {
+ u8 unused_000[0xc18];
+ u32 intrcause;
+ u8 unused_c1c[0x0dc];
+ u32 pci0_cfgaddr;
+ u32 pci0_cfgdata;
+};
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static struct gt64120_regs *gt_regs;
+
+/*
+ * PCI controller "hose" value
+ */
+static struct pci_controller hose;
+
+#define GT_INTRCAUSE_ABORT_BITS \
+ (GT_INTRCAUSE_MASABORT0_BIT | GT_INTRCAUSE_TARABORT0_BIT)
+
+static int gt_config_access(unsigned char access_type, pci_dev_t bdf,
+ int where, u32 *data)
+{
+ unsigned int bus = PCI_BUS(bdf);
+ unsigned int dev = PCI_DEV(bdf);
+ unsigned int devfn = PCI_DEV(bdf) << 3 | PCI_FUNC(bdf);
+ u32 intr;
+ u32 addr;
+ u32 val;
+
+ if (bus == 0 && dev >= 31) {
+ /* Because of a bug in the galileo (for slot 31). */
+ return -1;
+ }
+
+ if (access_type == PCI_ACCESS_WRITE)
+ debug("PCI WR %02x:%02x.%x reg:%02d data:%08x\n",
+ PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf),
+ where, *data);
+
+ /* Clear cause register bits */
+ __raw_writel(~GT_INTRCAUSE_ABORT_BITS, >_regs->intrcause);
+
+ addr = GT_PCI0_CFGADDR_CONFIGEN_BIT;
+ addr |= bus << GT_PCI0_CFGADDR_BUSNUM_SHF;
+ addr |= devfn << GT_PCI0_CFGADDR_FUNCTNUM_SHF;
+ addr |= (where / 4) << GT_PCI0_CFGADDR_REGNUM_SHF;
+
+ /* Setup address */
+ __raw_writel(addr, >_regs->pci0_cfgaddr);
+
+ if (access_type == PCI_ACCESS_WRITE) {
+ if (bus == 0 && dev == 0) {
+ /*
+ * The Galileo system controller is acting
+ * differently than other devices.
+ */
+ val = *data;
+ } else
+ val = cpu_to_le32(*data);
+
+ __raw_writel(val, >_regs->pci0_cfgdata);
+ } else {
+ val = __raw_readl(>_regs->pci0_cfgdata);
+
+ if (bus == 0 && dev == 0) {
+ /*
+ * The Galileo system controller is acting
+ * differently than other devices.
+ */
+ *data = val;
+ } else
+ *data = le32_to_cpu(val);
+ }
+
+ /* Check for master or target abort */
+ intr = __raw_readl(>_regs->intrcause);
+ if (intr & GT_INTRCAUSE_ABORT_BITS) {
+ /* Error occurred, clear abort bits */
+ __raw_writel(~GT_INTRCAUSE_ABORT_BITS, >_regs->intrcause);
+ return -1;
+ }
+
+ if (access_type == PCI_ACCESS_READ)
+ debug("PCI RD %02x:%02x.%x reg:%02d data:%08x\n",
+ PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), where, *data);
+
+ return 0;
+}
+
+static int gt_read_config_dword(struct pci_controller *hose, pci_dev_t dev,
+ int where, u32 *value)
+{
+ *value = 0xffffffff;
+ return gt_config_access(PCI_ACCESS_READ, dev, where, value);
+}
+
+static int gt_write_config_dword(struct pci_controller *hose, pci_dev_t dev,
+ int where, u32 value)
+{
+ u32 data = value;
+
+ return gt_config_access(PCI_ACCESS_WRITE, dev, where, &data);
+}
+
+void pci_init_board(void)
+{
+ set_io_port_base(CKSEG1ADDR(MALTA_IO_PORT_BASE));
+
+ gt_regs = (struct gt64120_regs *) CKSEG1ADDR(MALTA_GT_BASE);
+
+ hose.first_busno = 0;
+ hose.last_busno = 0xff;
+
+ /* System memory space */
+ pci_set_region(&hose.regions[0],
+ 0x00000000, 0x00000000,
+ CONFIG_SYS_MEM_SIZE,
+ PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
+
+ /* PCI memory space */
+ pci_set_region(&hose.regions[1],
+ 0x10000000, 0x10000000,
+ 128 * 1024 * 1024,
+ PCI_REGION_MEM);
+
+ /* PCI I/O space */
+ pci_set_region(&hose.regions[2],
+ 0x0000000, 0x0000000,
+ 0x20000,
+ PCI_REGION_IO);
+
+ hose.region_count = 3;
+
+ pci_set_ops(&hose,
+ pci_hose_read_config_byte_via_dword,
+ pci_hose_read_config_word_via_dword,
+ gt_read_config_dword,
+ pci_hose_write_config_byte_via_dword,
+ pci_hose_write_config_word_via_dword,
+ gt_write_config_dword);
+
+ pci_register_hose(&hose);
+ hose.last_busno = pci_hose_scan(&hose);
+}
diff --git a/include/configs/qemu-malta.h b/include/configs/qemu-malta.h
index 881c15d..36b584a 100644
--- a/include/configs/qemu-malta.h
+++ b/include/configs/qemu-malta.h
@@ -17,6 +17,9 @@
*/
#define CONFIG_QEMU_MALTA
+#define CONFIG_PCI
+#define CONFIG_PCI_PNP
+
/*
* CPU Configuration
*/
@@ -30,6 +33,7 @@
#define CONFIG_SWAP_IO_SPACE
+
/*
* Memory map
*/
@@ -108,6 +112,8 @@
#undef CONFIG_CMD_NET
#undef CONFIG_CMD_NFS
+#define CONFIG_CMD_PCI
+
#define CONFIG_SYS_LONGHELP /* verbose help, undef to save memory */
#endif /* _QEMU_MALTA_CONFIG_H */
--
1.7.10
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