[PATCH v3 1/2] PCI support added to ARC
From: Joao Pinto
Date: Mon Dec 21 2015 - 10:44:35 EST
This patch adds PCI support to ARC and updates drivers/pci Makefile enabling
the ARC arch to use the generic PCI setup functions.
Signed-off-by: Joao Pinto <jpinto@xxxxxxxxxxxx>
---
Change v2 -> v3 (Bjorn Helgaas):
- arch/arc/kernel/pcibios.c unused functions were removed and also the
arch/arc/include/asm/mach/pci.h was removed because was no longer necessary
Change v1 -> v2:
- In arch/arc/Kconfig, the new menu entry (Bus Configuration) was moved to the
slot between sourcing of drivers/Kconfig and fs/Kconfig (Vineet Gupta)
- In arch/arc/plat-axs10x/Kconfig the "select MIGHT_HAVE_PCI" option was placed
in order as suggested (Vineet Gupta)
- ioport_map() and ioport_unmap() were static inlined and included in
the io.h (Vineet Gupta)
- pcibios_min_io and pcibios_min_mem declaration moved to
pcibios.c (Vineet Gupta)
- pr_err() replaced by dev_err() in pcibios_enable_device() (Bjorn Helgaas)
- string simplified in pcibios_enable_device() (Vineet Gupta)
- pci_host_bridge_window structure was replaced by resource_entry structure, and
list_for_each_entry() for resource_list_for_each_entry() in pcibios.c
arch/arc/Kconfig | 23 ++++++++++++++++++
arch/arc/include/asm/dma.h | 5 ++++
arch/arc/include/asm/io.h | 10 ++++++++
arch/arc/include/asm/pci.h | 43 ++++++++++++++++++++++++++++++++++
arch/arc/kernel/Makefile | 1 +
arch/arc/kernel/pcibios.c | 55 ++++++++++++++++++++++++++++++++++++++++++++
arch/arc/mm/ioremap.c | 10 +++++++-
arch/arc/plat-axs10x/Kconfig | 1 +
drivers/pci/Makefile | 1 +
9 files changed, 148 insertions(+), 1 deletion(-)
create mode 100644 arch/arc/include/asm/pci.h
create mode 100644 arch/arc/kernel/pcibios.c
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 2c2ac3f..98b32c1 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -19,6 +19,7 @@ config ARC
select GENERIC_FIND_FIRST_BIT
# for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
select GENERIC_IRQ_SHOW
+ select GENERIC_PCI_IOMAP
select GENERIC_PENDING_IRQ if SMP
select GENERIC_SMP_IDLE_THREAD
select HAVE_ARCH_KGDB
@@ -39,6 +40,9 @@ config ARC
select PERF_USE_VMALLOC
select HAVE_DEBUG_STACKOVERFLOW
+config MIGHT_HAVE_PCI
+ bool
+
config TRACE_IRQFLAGS_SUPPORT
def_bool y
@@ -570,6 +574,25 @@ endmenu # "ARC Architecture Configuration"
source "mm/Kconfig"
source "net/Kconfig"
source "drivers/Kconfig"
+
+menu "Bus Support"
+
+config PCI
+ bool "PCI support" if MIGHT_HAVE_PCI
+ help
+ PCI is the name of a bus system, i.e. the way the CPU talks to the other stuff inside
+ your box.Find out if your board/platform have PCI.
+ Note: PCIE support for Synopsys Device will be available only when
+ HAPS DX is configured with PCIE RC bitmap. If you have PCI, say Y, otherwise N.
+
+config PCI_SYSCALL
+ def_bool PCI
+
+source "drivers/pci/Kconfig"
+source "drivers/pci/pcie/Kconfig"
+
+endmenu
+
source "fs/Kconfig"
source "arch/arc/Kconfig.debug"
source "security/Kconfig"
diff --git a/arch/arc/include/asm/dma.h b/arch/arc/include/asm/dma.h
index ca7c451..37942fa 100644
--- a/arch/arc/include/asm/dma.h
+++ b/arch/arc/include/asm/dma.h
@@ -10,5 +10,10 @@
#define ASM_ARC_DMA_H
#define MAX_DMA_ADDRESS 0xC0000000
+#ifdef CONFIG_PCI
+extern int isa_dma_bridge_buggy;
+#else
+#define isa_dma_bridge_buggy (0)
+#endif
#endif
diff --git a/arch/arc/include/asm/io.h b/arch/arc/include/asm/io.h
index 694ece8..2ec3cf4 100644
--- a/arch/arc/include/asm/io.h
+++ b/arch/arc/include/asm/io.h
@@ -16,7 +16,17 @@
extern void __iomem *ioremap(unsigned long physaddr, unsigned long size);
extern void __iomem *ioremap_prot(phys_addr_t offset, unsigned long size,
unsigned long flags);
+static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
+{
+ return (void __iomem *)port;
+}
+
+static inline void ioport_unmap(void __iomem *addr)
+{
+}
+
extern void iounmap(const void __iomem *addr);
+extern int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr);
#define ioremap_nocache(phy, sz) ioremap(phy, sz)
#define ioremap_wc(phy, sz) ioremap(phy, sz)
diff --git a/arch/arc/include/asm/pci.h b/arch/arc/include/asm/pci.h
new file mode 100644
index 0000000..a0a0fa5
--- /dev/null
+++ b/arch/arc/include/asm/pci.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2015-2016 Synopsys, Inc. (www.synopsys.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.
+ */
+
+#ifndef _ASM_ARC_PCI_H
+#define _ASM_ARC_PCI_H
+
+#ifdef __KERNEL__
+#include <asm-generic/pci-dma-compat.h>
+#include <asm-generic/pci-bridge.h>
+
+#include <linux/ioport.h>
+
+extern unsigned long pcibios_min_io;
+#define PCIBIOS_MIN_IO pcibios_min_io
+extern unsigned long pcibios_min_mem;
+#define PCIBIOS_MIN_MEM pcibios_min_mem
+
+#define pcibios_assign_all_busses() 1
+/*
+ * The PCI address space does equal the physical memory address space.
+ * The networking and block device layers use this boolean for bounce
+ * buffer decisions.
+ */
+#define PCI_DMA_BUS_IS_PHYS (1)
+
+/*
+ * Setup early fixed I/O mapping.
+ */
+#if defined(CONFIG_PCI)
+extern void pci_map_io_early(unsigned long pfn);
+#else
+static inline void pci_map_io_early(unsigned long pfn) {}
+#endif
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_ARC_PCI_H */
+
diff --git a/arch/arc/kernel/Makefile b/arch/arc/kernel/Makefile
index e7f3625..1bc2036 100644
--- a/arch/arc/kernel/Makefile
+++ b/arch/arc/kernel/Makefile
@@ -12,6 +12,7 @@ obj-y := arcksyms.o setup.o irq.o time.o reset.o ptrace.o process.o devtree.o
obj-y += signal.o traps.o sys.o troubleshoot.o stacktrace.o disasm.o clk.o
obj-$(CONFIG_ISA_ARCOMPACT) += entry-compact.o intc-compact.o
obj-$(CONFIG_ISA_ARCV2) += entry-arcv2.o intc-arcv2.o
+obj-$(CONFIG_PCI) += pcibios.o
obj-$(CONFIG_MODULES) += arcksyms.o module.o
obj-$(CONFIG_SMP) += smp.o
diff --git a/arch/arc/kernel/pcibios.c b/arch/arc/kernel/pcibios.c
new file mode 100644
index 0000000..99ee329
--- /dev/null
+++ b/arch/arc/kernel/pcibios.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2014-2015 Synopsys, Inc. (www.synopsys.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 <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/bootmem.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+
+#include <asm/pci.h>
+
+unsigned long pcibios_min_io = 0x100;
+EXPORT_SYMBOL(pcibios_min_io);
+
+unsigned long pcibios_min_mem = 0x100000;
+EXPORT_SYMBOL(pcibios_min_mem);
+
+/*
+ * We don't have to worry about legacy ISA devices, so nothing to do here
+ */
+resource_size_t pcibios_align_resource(void *data, const struct resource *res,
+ resource_size_t size, resource_size_t align)
+{
+ return res->start;
+}
+
+/*
+ * If the bus contains any of these devices, then we must not turn on
+ * parity checking of any kind. Currently this is CyberPro 20x0 only.
+ */
+static inline int pdev_bad_for_parity(struct pci_dev *dev)
+{
+ return ((dev->vendor == PCI_VENDOR_ID_INTERG &&
+ (dev->device == PCI_DEVICE_ID_INTERG_2000 ||
+ dev->device == PCI_DEVICE_ID_INTERG_2010)) ||
+ (dev->vendor == PCI_VENDOR_ID_ITE &&
+ dev->device == PCI_DEVICE_ID_ITE_8152));
+
+}
+
+void pcibios_fixup_bus(struct pci_bus *bus)
+{
+}
+EXPORT_SYMBOL(pcibios_fixup_bus);
diff --git a/arch/arc/mm/ioremap.c b/arch/arc/mm/ioremap.c
index 739e65f..fe807b0 100644
--- a/arch/arc/mm/ioremap.c
+++ b/arch/arc/mm/ioremap.c
@@ -13,6 +13,7 @@
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/cache.h>
+#include <linux/sizes.h>
void __iomem *ioremap(unsigned long paddr, unsigned long size)
{
@@ -80,7 +81,6 @@ void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size,
}
EXPORT_SYMBOL(ioremap_prot);
-
void iounmap(const void __iomem *addr)
{
if (addr >= (void __force __iomem *)ARC_UNCACHED_ADDR_SPACE)
@@ -89,3 +89,11 @@ void iounmap(const void __iomem *addr)
vfree((void *)(PAGE_MASK & (unsigned long __force)addr));
}
EXPORT_SYMBOL(iounmap);
+
+#ifdef CONFIG_PCI
+int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr)
+{
+ return ioremap_nocache(phys_addr + offset, SZ_64K);
+}
+EXPORT_SYMBOL_GPL(pci_ioremap_io);
+#endif
diff --git a/arch/arc/plat-axs10x/Kconfig b/arch/arc/plat-axs10x/Kconfig
index d475f9d..426ac4b 100644
--- a/arch/arc/plat-axs10x/Kconfig
+++ b/arch/arc/plat-axs10x/Kconfig
@@ -11,6 +11,7 @@ menuconfig ARC_PLAT_AXS10X
select DW_APB_ICTL
select GPIO_DWAPB
select OF_GPIO
+ select MIGHT_HAVE_PCI
select GENERIC_IRQ_CHIP
select ARCH_REQUIRE_GPIOLIB
help
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index be3f631..2154092 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_PCI_IOV) += iov.o
# Some architectures use the generic PCI setup functions
#
obj-$(CONFIG_ALPHA) += setup-irq.o
+obj-$(CONFIG_ARC) += setup-irq.o
obj-$(CONFIG_ARM) += setup-irq.o
obj-$(CONFIG_ARM64) += setup-irq.o
obj-$(CONFIG_UNICORE32) += setup-irq.o
--
1.8.1.5
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