From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001
From: root <root@artemis.panaceas.org>
Date: Fri, 25 Dec 2015 04:40:36 +0000
Subject: initial_commit

---
 arch/alpha/kernel/pci-noop.c | 199 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 199 insertions(+)
 create mode 100644 arch/alpha/kernel/pci-noop.c

(limited to 'arch/alpha/kernel/pci-noop.c')

diff --git a/arch/alpha/kernel/pci-noop.c b/arch/alpha/kernel/pci-noop.c
new file mode 100644
index 00000000..246100ef
--- /dev/null
+++ b/arch/alpha/kernel/pci-noop.c
@@ -0,0 +1,199 @@
+/*
+ *	linux/arch/alpha/kernel/pci-noop.c
+ *
+ * Stub PCI interfaces for Jensen-specific kernels.
+ */
+
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/gfp.h>
+#include <linux/capability.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/dma-mapping.h>
+#include <linux/scatterlist.h>
+
+#include "proto.h"
+
+
+/*
+ * The PCI controller list.
+ */
+
+struct pci_controller *hose_head, **hose_tail = &hose_head;
+struct pci_controller *pci_isa_hose;
+
+
+struct pci_controller * __init
+alloc_pci_controller(void)
+{
+	struct pci_controller *hose;
+
+	hose = alloc_bootmem(sizeof(*hose));
+
+	*hose_tail = hose;
+	hose_tail = &hose->next;
+
+	return hose;
+}
+
+struct resource * __init
+alloc_resource(void)
+{
+	struct resource *res;
+
+	res = alloc_bootmem(sizeof(*res));
+
+	return res;
+}
+
+asmlinkage long
+sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
+{
+	struct pci_controller *hose;
+
+	/* from hose or from bus.devfn */
+	if (which & IOBASE_FROM_HOSE) {
+		for (hose = hose_head; hose; hose = hose->next) 
+			if (hose->index == bus)
+				break;
+		if (!hose)
+			return -ENODEV;
+	} else {
+		/* Special hook for ISA access.  */
+		if (bus == 0 && dfn == 0)
+			hose = pci_isa_hose;
+		else
+			return -ENODEV;
+	}
+
+	switch (which & ~IOBASE_FROM_HOSE) {
+	case IOBASE_HOSE:
+		return hose->index;
+	case IOBASE_SPARSE_MEM:
+		return hose->sparse_mem_base;
+	case IOBASE_DENSE_MEM:
+		return hose->dense_mem_base;
+	case IOBASE_SPARSE_IO:
+		return hose->sparse_io_base;
+	case IOBASE_DENSE_IO:
+		return hose->dense_io_base;
+	case IOBASE_ROOT_BUS:
+		return hose->bus->number;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+asmlinkage long
+sys_pciconfig_read(unsigned long bus, unsigned long dfn,
+		   unsigned long off, unsigned long len, void *buf)
+{
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+	else
+		return -ENODEV;
+}
+
+asmlinkage long
+sys_pciconfig_write(unsigned long bus, unsigned long dfn,
+		    unsigned long off, unsigned long len, void *buf)
+{
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+	else
+		return -ENODEV;
+}
+
+static void *alpha_noop_alloc_coherent(struct device *dev, size_t size,
+				       dma_addr_t *dma_handle, gfp_t gfp)
+{
+	void *ret;
+
+	if (!dev || *dev->dma_mask >= 0xffffffffUL)
+		gfp &= ~GFP_DMA;
+	ret = (void *)__get_free_pages(gfp, get_order(size));
+	if (ret) {
+		memset(ret, 0, size);
+		*dma_handle = virt_to_phys(ret);
+	}
+	return ret;
+}
+
+static void alpha_noop_free_coherent(struct device *dev, size_t size,
+				     void *cpu_addr, dma_addr_t dma_addr)
+{
+	free_pages((unsigned long)cpu_addr, get_order(size));
+}
+
+static dma_addr_t alpha_noop_map_page(struct device *dev, struct page *page,
+				      unsigned long offset, size_t size,
+				      enum dma_data_direction dir,
+				      struct dma_attrs *attrs)
+{
+	return page_to_pa(page) + offset;
+}
+
+static int alpha_noop_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
+			     enum dma_data_direction dir, struct dma_attrs *attrs)
+{
+	int i;
+	struct scatterlist *sg;
+
+	for_each_sg(sgl, sg, nents, i) {
+		void *va;
+
+		BUG_ON(!sg_page(sg));
+		va = sg_virt(sg);
+		sg_dma_address(sg) = (dma_addr_t)virt_to_phys(va);
+		sg_dma_len(sg) = sg->length;
+	}
+
+	return nents;
+}
+
+static int alpha_noop_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+	return 0;
+}
+
+static int alpha_noop_supported(struct device *dev, u64 mask)
+{
+	return mask < 0x00ffffffUL ? 0 : 1;
+}
+
+static int alpha_noop_set_mask(struct device *dev, u64 mask)
+{
+	if (!dev->dma_mask || !dma_supported(dev, mask))
+		return -EIO;
+
+	*dev->dma_mask = mask;
+	return 0;
+}
+
+struct dma_map_ops alpha_noop_ops = {
+	.alloc_coherent		= alpha_noop_alloc_coherent,
+	.free_coherent		= alpha_noop_free_coherent,
+	.map_page		= alpha_noop_map_page,
+	.map_sg			= alpha_noop_map_sg,
+	.mapping_error		= alpha_noop_mapping_error,
+	.dma_supported		= alpha_noop_supported,
+	.set_dma_mask		= alpha_noop_set_mask,
+};
+
+struct dma_map_ops *dma_ops = &alpha_noop_ops;
+EXPORT_SYMBOL(dma_ops);
+
+void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
+{
+	return NULL;
+}
+
+void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
+{
+}
+
+EXPORT_SYMBOL(pci_iomap);
+EXPORT_SYMBOL(pci_iounmap);
-- 
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