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/arch/alpha/kernel/pci-noop.c

https://gitlab.com/vogoplayer-tools/xz0032-linux
C | 199 lines | 153 code | 36 blank | 10 comment | 18 complexity | 75c86e0e9a37645fdf18339aea18d765 MD5 | raw file
  1/*
  2 *	linux/arch/alpha/kernel/pci-noop.c
  3 *
  4 * Stub PCI interfaces for Jensen-specific kernels.
  5 */
  6
  7#include <linux/pci.h>
  8#include <linux/init.h>
  9#include <linux/bootmem.h>
 10#include <linux/gfp.h>
 11#include <linux/capability.h>
 12#include <linux/mm.h>
 13#include <linux/errno.h>
 14#include <linux/sched.h>
 15#include <linux/dma-mapping.h>
 16#include <linux/scatterlist.h>
 17
 18#include "proto.h"
 19
 20
 21/*
 22 * The PCI controller list.
 23 */
 24
 25struct pci_controller *hose_head, **hose_tail = &hose_head;
 26struct pci_controller *pci_isa_hose;
 27
 28
 29struct pci_controller * __init
 30alloc_pci_controller(void)
 31{
 32	struct pci_controller *hose;
 33
 34	hose = alloc_bootmem(sizeof(*hose));
 35
 36	*hose_tail = hose;
 37	hose_tail = &hose->next;
 38
 39	return hose;
 40}
 41
 42struct resource * __init
 43alloc_resource(void)
 44{
 45	struct resource *res;
 46
 47	res = alloc_bootmem(sizeof(*res));
 48
 49	return res;
 50}
 51
 52asmlinkage long
 53sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
 54{
 55	struct pci_controller *hose;
 56
 57	/* from hose or from bus.devfn */
 58	if (which & IOBASE_FROM_HOSE) {
 59		for (hose = hose_head; hose; hose = hose->next) 
 60			if (hose->index == bus)
 61				break;
 62		if (!hose)
 63			return -ENODEV;
 64	} else {
 65		/* Special hook for ISA access.  */
 66		if (bus == 0 && dfn == 0)
 67			hose = pci_isa_hose;
 68		else
 69			return -ENODEV;
 70	}
 71
 72	switch (which & ~IOBASE_FROM_HOSE) {
 73	case IOBASE_HOSE:
 74		return hose->index;
 75	case IOBASE_SPARSE_MEM:
 76		return hose->sparse_mem_base;
 77	case IOBASE_DENSE_MEM:
 78		return hose->dense_mem_base;
 79	case IOBASE_SPARSE_IO:
 80		return hose->sparse_io_base;
 81	case IOBASE_DENSE_IO:
 82		return hose->dense_io_base;
 83	case IOBASE_ROOT_BUS:
 84		return hose->bus->number;
 85	}
 86
 87	return -EOPNOTSUPP;
 88}
 89
 90asmlinkage long
 91sys_pciconfig_read(unsigned long bus, unsigned long dfn,
 92		   unsigned long off, unsigned long len, void *buf)
 93{
 94	if (!capable(CAP_SYS_ADMIN))
 95		return -EPERM;
 96	else
 97		return -ENODEV;
 98}
 99
100asmlinkage long
101sys_pciconfig_write(unsigned long bus, unsigned long dfn,
102		    unsigned long off, unsigned long len, void *buf)
103{
104	if (!capable(CAP_SYS_ADMIN))
105		return -EPERM;
106	else
107		return -ENODEV;
108}
109
110static void *alpha_noop_alloc_coherent(struct device *dev, size_t size,
111				       dma_addr_t *dma_handle, gfp_t gfp)
112{
113	void *ret;
114
115	if (!dev || *dev->dma_mask >= 0xffffffffUL)
116		gfp &= ~GFP_DMA;
117	ret = (void *)__get_free_pages(gfp, get_order(size));
118	if (ret) {
119		memset(ret, 0, size);
120		*dma_handle = virt_to_phys(ret);
121	}
122	return ret;
123}
124
125static void alpha_noop_free_coherent(struct device *dev, size_t size,
126				     void *cpu_addr, dma_addr_t dma_addr)
127{
128	free_pages((unsigned long)cpu_addr, get_order(size));
129}
130
131static dma_addr_t alpha_noop_map_page(struct device *dev, struct page *page,
132				      unsigned long offset, size_t size,
133				      enum dma_data_direction dir,
134				      struct dma_attrs *attrs)
135{
136	return page_to_pa(page) + offset;
137}
138
139static int alpha_noop_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
140			     enum dma_data_direction dir, struct dma_attrs *attrs)
141{
142	int i;
143	struct scatterlist *sg;
144
145	for_each_sg(sgl, sg, nents, i) {
146		void *va;
147
148		BUG_ON(!sg_page(sg));
149		va = sg_virt(sg);
150		sg_dma_address(sg) = (dma_addr_t)virt_to_phys(va);
151		sg_dma_len(sg) = sg->length;
152	}
153
154	return nents;
155}
156
157static int alpha_noop_mapping_error(struct device *dev, dma_addr_t dma_addr)
158{
159	return 0;
160}
161
162static int alpha_noop_supported(struct device *dev, u64 mask)
163{
164	return mask < 0x00ffffffUL ? 0 : 1;
165}
166
167static int alpha_noop_set_mask(struct device *dev, u64 mask)
168{
169	if (!dev->dma_mask || !dma_supported(dev, mask))
170		return -EIO;
171
172	*dev->dma_mask = mask;
173	return 0;
174}
175
176struct dma_map_ops alpha_noop_ops = {
177	.alloc_coherent		= alpha_noop_alloc_coherent,
178	.free_coherent		= alpha_noop_free_coherent,
179	.map_page		= alpha_noop_map_page,
180	.map_sg			= alpha_noop_map_sg,
181	.mapping_error		= alpha_noop_mapping_error,
182	.dma_supported		= alpha_noop_supported,
183	.set_dma_mask		= alpha_noop_set_mask,
184};
185
186struct dma_map_ops *dma_ops = &alpha_noop_ops;
187EXPORT_SYMBOL(dma_ops);
188
189void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
190{
191	return NULL;
192}
193
194void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
195{
196}
197
198EXPORT_SYMBOL(pci_iomap);
199EXPORT_SYMBOL(pci_iounmap);