[mirror_ubuntu-bionic-kernel.git] / arch / alpha / kernel / pci-noop.c

// SPDX-License-Identifier: GPL-2.0
/*
 *	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)
{
	return alloc_bootmem(sizeof(struct resource));
}

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,
				       unsigned long attrs)
{
	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 int alpha_noop_supported(struct device *dev, u64 mask)
{
	return mask < 0x00ffffffUL ? 0 : 1;
}

const struct dma_map_ops alpha_noop_ops = {
	.alloc			= alpha_noop_alloc_coherent,
	.free			= dma_noop_free_coherent,
	.map_page		= dma_noop_map_page,
	.map_sg			= dma_noop_map_sg,
	.mapping_error		= dma_noop_mapping_error,
	.dma_supported		= alpha_noop_supported,
};

const struct dma_map_ops *dma_ops = &alpha_noop_ops;
EXPORT_SYMBOL(dma_ops);
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* linux/arch/alpha/kernel/pci-noop.c
	4	*
	5	* Stub PCI interfaces for Jensen-specific kernels.
	6	*/
	7
	8	#include <linux/pci.h>
	9	#include <linux/init.h>
	10	#include <linux/bootmem.h>
5a0e3ad6	11	#include <linux/gfp.h>
a9415644	12	#include <linux/capability.h>
1da177e4 LT	13	#include <linux/mm.h>
	14	#include <linux/errno.h>
	15	#include <linux/sched.h>
	16	#include <linux/dma-mapping.h>
8c8d7214	17	#include <linux/scatterlist.h>
1da177e4 LT	18
	19	#include "proto.h"
	20
	21
	22	/*
	23	* The PCI controller list.
	24	*/
	25
	26	struct pci_controller hose_head, *hose_tail = &hose_head;
	27	struct pci_controller *pci_isa_hose;
	28
	29
	30	struct pci_controller * __init
	31	alloc_pci_controller(void)
	32	{
	33	struct pci_controller *hose;
	34
	35	hose = alloc_bootmem(sizeof(*hose));
	36
	37	*hose_tail = hose;
	38	hose_tail = &hose->next;
	39
	40	return hose;
	41	}
	42
	43	struct resource * __init
	44	alloc_resource(void)
	45	{
203308a5	46	return alloc_bootmem(sizeof(struct resource));
1da177e4 LT	47	}
	48
	49	asmlinkage long
	50	sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
	51	{
	52	struct pci_controller *hose;
	53
	54	/* from hose or from bus.devfn */
	55	if (which & IOBASE_FROM_HOSE) {
	56	for (hose = hose_head; hose; hose = hose->next)
	57	if (hose->index == bus)
	58	break;
	59	if (!hose)
	60	return -ENODEV;
	61	} else {
	62	/* Special hook for ISA access. */
	63	if (bus == 0 && dfn == 0)
	64	hose = pci_isa_hose;
	65	else
	66	return -ENODEV;
	67	}
	68
	69	switch (which & ~IOBASE_FROM_HOSE) {
	70	case IOBASE_HOSE:
	71	return hose->index;
	72	case IOBASE_SPARSE_MEM:
	73	return hose->sparse_mem_base;
	74	case IOBASE_DENSE_MEM:
	75	return hose->dense_mem_base;
	76	case IOBASE_SPARSE_IO:
	77	return hose->sparse_io_base;
	78	case IOBASE_DENSE_IO:
	79	return hose->dense_io_base;
	80	case IOBASE_ROOT_BUS:
	81	return hose->bus->number;
	82	}
	83
	84	return -EOPNOTSUPP;
	85	}
	86
	87	asmlinkage long
	88	sys_pciconfig_read(unsigned long bus, unsigned long dfn,
	89	unsigned long off, unsigned long len, void *buf)
	90	{
	91	if (!capable(CAP_SYS_ADMIN))
	92	return -EPERM;
	93	else
	94	return -ENODEV;
	95	}
	96
	97	asmlinkage long
	98	sys_pciconfig_write(unsigned long bus, unsigned long dfn,
	99	unsigned long off, unsigned long len, void *buf)
	100	{
	101	if (!capable(CAP_SYS_ADMIN))
	102	return -EPERM;
	103	else
	104	return -ENODEV;
	105	}
	106
c186caca	107	static void alpha_noop_alloc_coherent(struct device dev, size_t size,
4ce9a91f	108	dma_addr_t *dma_handle, gfp_t gfp,
00085f1e	109	unsigned long attrs)
1da177e4 LT	110	{
	111	void *ret;
	112
	113	if (!dev \|\| *dev->dma_mask >= 0xffffffffUL)
	114	gfp &= ~GFP_DMA;
	115	ret = (void *)__get_free_pages(gfp, get_order(size));
	116	if (ret) {
	117	memset(ret, 0, size);
fd2e2633	118	*dma_handle = virt_to_phys(ret);
1da177e4 LT	119	}
	120	return ret;
	121	}
	122
c186caca FT	123	static int alpha_noop_supported(struct device *dev, u64 mask)
	124	{
	125	return mask < 0x00ffffffUL ? 0 : 1;
	126	}
1da177e4	127
5299709d	128	const struct dma_map_ops alpha_noop_ops = {
4ce9a91f	129	.alloc = alpha_noop_alloc_coherent,
6aca0503 CB	130	.free = dma_noop_free_coherent,
	131	.map_page = dma_noop_map_page,
	132	.map_sg = dma_noop_map_sg,
	133	.mapping_error = dma_noop_mapping_error,
c186caca	134	.dma_supported = alpha_noop_supported,
c186caca FT	135	};
c186caca FT	136
5299709d	137	const struct dma_map_ops *dma_ops = &alpha_noop_ops;
c186caca	138	EXPORT_SYMBOL(dma_ops);