[PATCH V4 06/16] MIPS: Loongson 3: Add HT-linked PCI support.

Huacai Chen
2012-08-03T07:10:46Z

Loongson family machines use Hyper-Transport bus for inter-core
connection and device connection. The PCI bus is a subordinate
linked at HT1.

With UEFI-like firmware interface, We don't need fixup for PCI irq
routing.

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Hongliang Tao <taohl@lemote.com>
Signed-off-by: Hua Yan <yanh@lemote.com>
---
arch/mips/include/asm/mach-loongson/loongson.h | 7 ++
arch/mips/include/asm/mach-loongson/pci.h | 5 +
arch/mips/pci/Makefile | 1 +
arch/mips/pci/fixup-loongson3.c | 64 +++++++++++++++
arch/mips/pci/ops-loongson3.c | 104 ++++++++++++++++++++++++
5 files changed, 181 insertions(+), 0 deletions(-)
create mode 100644 arch/mips/pci/fixup-loongson3.c
create mode 100644 arch/mips/pci/ops-loongson3.c

diff --git a/arch/mips/include/asm/mach-loongson/loongson.h b/arch/mips/include/asm/mach-loongson/loongson.h
index 6a1bcf3..960811a 100644
--- a/arch/mips/include/asm/mach-loongson/loongson.h
+++ b/arch/mips/include/asm/mach-loongson/loongson.h
@@ -15,6 +15,7 @@
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/kconfig.h>
+#include <boot_param.h>

/* loongson internal northbridge initialization */
extern void bonito_irq_init(void);
@@ -101,7 +102,13 @@ static inline void do_perfcnt_IRQ(void)
#define LOONGSON_PCICFG_BASE 0x1fe80000
#define LOONGSON_PCICFG_SIZE 0x00000800 /* 2K */
#define LOONGSON_PCICFG_TOP (LOONGSON_PCICFG_BASE+LOONGSON_PCICFG_SIZE-1)
+
+#if defined(CONFIG_HT_PCI)
+#define LOONGSON_PCIIO_BASE loongson_pciio_base
+#else
#define LOONGSON_PCIIO_BASE 0x1fd00000
+#endif
+
#define LOONGSON_PCIIO_SIZE 0x00100000 /* 1M */
#define LOONGSON_PCIIO_TOP (LOONGSON_PCIIO_BASE+LOONGSON_PCIIO_SIZE-1)

diff --git a/arch/mips/include/asm/mach-loongson/pci.h b/arch/mips/include/asm/mach-loongson/pci.h
index bc99dab..1212774 100644
--- a/arch/mips/include/asm/mach-loongson/pci.h
+++ b/arch/mips/include/asm/mach-loongson/pci.h
@@ -40,8 +40,13 @@ extern struct pci_ops loongson_pci_ops;
#else /* loongson2f/32bit & loongson2e */

/* this pci memory space is mapped by pcimap in pci.c */
+#ifdef CONFIG_CPU_LOONGSON3
+#define LOONGSON_PCI_MEM_START 0x40000000UL
+#define LOONGSON_PCI_MEM_END 0x7effffffUL
+#else
#define LOONGSON_PCI_MEM_START LOONGSON_PCILO1_BASE
#define LOONGSON_PCI_MEM_END (LOONGSON_PCILO1_BASE + 0x04000000 * 2)
+#endif
/* this is an offset from mips_io_port_base */
#define LOONGSON_PCI_IO_START 0x00004000UL

diff --git a/arch/mips/pci/Makefile b/arch/mips/pci/Makefile
index e13a71c..0723723 100644
--- a/arch/mips/pci/Makefile
+++ b/arch/mips/pci/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_MIPS_COBALT) += fixup-cobalt.o
obj-$(CONFIG_SOC_PNX8550) += fixup-pnx8550.o ops-pnx8550.o
obj-$(CONFIG_LEMOTE_FULOONG2E) += fixup-fuloong2e.o ops-loongson2.o
obj-$(CONFIG_LEMOTE_MACH2F) += fixup-lemote2f.o ops-loongson2.o
+obj-$(CONFIG_LEMOTE_MACH3A) += fixup-loongson3.o ops-loongson3.o
obj-$(CONFIG_MIPS_MALTA) += fixup-malta.o
obj-$(CONFIG_PMC_MSP7120_GW) += fixup-pmcmsp.o ops-pmcmsp.o
obj-$(CONFIG_PMC_MSP7120_EVAL) += fixup-pmcmsp.o ops-pmcmsp.o
diff --git a/arch/mips/pci/fixup-loongson3.c b/arch/mips/pci/fixup-loongson3.c
new file mode 100644
index 0000000..d716567
--- /dev/null
+++ b/arch/mips/pci/fixup-loongson3.c
@@ -0,0 +1,64 @@
+/*
+ * fixup-loongson3.c
+ *
+ * Copyright (C) 2012 Lemote, Inc.
+ * Author: Xiang Yu, xiangy@lemote.com
+ * Chen Huacai, chenhc@lemote.com
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/pci.h>
+#include <boot_param.h>
+
+static void print_fixup_info(const struct pci_dev * pdev)
+{
+ printk(KERN_INFO "Fixup: bus%d dev%xh fun%xh %x:%x irq %d\n",
+ pdev->bus->number, PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn),
+ pdev->vendor, pdev->device, pdev->irq);
+
+}
+
+int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+ print_fixup_info(dev);
+ return dev->irq;
+}
+
+static void __init pci_fixup_radeon(struct pci_dev *pdev)
+{
+ if (pdev->resource[PCI_ROM_RESOURCE].start)
+ return;
+
+ pdev->resource[PCI_ROM_RESOURCE].start = vgabios_addr;
+ pdev->resource[PCI_ROM_RESOURCE].end = vgabios_addr + 256*1024 - 1;
+ pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_COPY;
+}
+
+DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_ATI, PCI_ANY_ID,
+ PCI_CLASS_DISPLAY_VGA, 8, pci_fixup_radeon);
+
+/* Do platform specific device initialization at pci_enable_device() time */
+int pcibios_plat_dev_init(struct pci_dev *dev)
+{
+ return 0;
+}
diff --git a/arch/mips/pci/ops-loongson3.c b/arch/mips/pci/ops-loongson3.c
new file mode 100644
index 0000000..b29d333
--- /dev/null
+++ b/arch/mips/pci/ops-loongson3.c
@@ -0,0 +1,104 @@
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+
+#include <asm/mips-boards/bonito64.h>
+
+#include <loongson.h>
+
+#define PCI_ACCESS_READ 0
+#define PCI_ACCESS_WRITE 1
+
+#define HT1LO_PCICFG_BASE 0x1a000000
+#define HT1LO_PCICFG_BASE_TP1 0x1b000000
+
+static int loongson3_pci_config_access(unsigned char access_type,
+ struct pci_bus *bus, unsigned int devfn,
+ int where, u32 *data)
+{
+ unsigned char busnum = bus->number;
+ u_int64_t addr, type;
+ void *addrp;
+ int device = PCI_SLOT(devfn);
+ int function = PCI_FUNC(devfn);
+ int reg = where & ~3;
+
+ if (busnum == 0) {
+ if (device > 31)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ addr = (device << 11) | (function << 8) | reg;
+ addrp = (void *)(TO_UNCAC(HT1LO_PCICFG_BASE) | (addr & 0xffff));
+ type = 0;
+
+ } else {
+ addr = (busnum << 16) | (device << 11) | (function << 8) | reg;
+ addrp = (void *)(TO_UNCAC(HT1LO_PCICFG_BASE_TP1) | (addr));
+ type = 0x10000;
+ }
+
+ if (access_type == PCI_ACCESS_WRITE)
+ *(volatile unsigned int *)addrp = cpu_to_le32(*data);
+ else {
+ *data = le32_to_cpu(*(volatile unsigned int *)addrp);
+ if (*data == 0xffffffff) {
+ *data = -1;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+ }
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int loongson3_pci_pcibios_read(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 * val)
+{
+ u32 data = 0;
+ int ret = loongson3_pci_config_access(PCI_ACCESS_READ,
+ bus, devfn, where, &data);
+
+ if (ret != PCIBIOS_SUCCESSFUL)
+ return ret;
+
+ if (size == 1)
+ *val = (data >> ((where & 3) << 3)) & 0xff;
+ else if (size == 2)
+ *val = (data >> ((where & 3) << 3)) & 0xffff;
+ else
+ *val = data;
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int loongson3_pci_pcibios_write(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 val)
+{
+ u32 data = 0;
+ int ret;
+
+ if (size == 4)
+ data = val;
+ else {
+ ret = loongson3_pci_config_access(PCI_ACCESS_READ,
+ bus, devfn, where, &data);
+ if (ret != PCIBIOS_SUCCESSFUL)
+ return ret;
+
+ if (size == 1)
+ data = (data & ~(0xff << ((where & 3) << 3))) |
+ (val << ((where & 3) << 3));
+ else if (size == 2)
+ data = (data & ~(0xffff << ((where & 3) << 3))) |
+ (val << ((where & 3) << 3));
+ }
+
+ ret = loongson3_pci_config_access(PCI_ACCESS_WRITE,
+ bus, devfn, where, &data);
+ if (ret != PCIBIOS_SUCCESSFUL)
+ return ret;
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops loongson_pci_ops = {
+ .read = loongson3_pci_pcibios_read,
+ .write = loongson3_pci_pcibios_write
+};
--
1.7.7.3