/* via_drv.c -- VIA unichrome driver -*- linux-c -*- * Created: Fri Aug 12 2005 by anholt@FreeBSD.org */ /*- * Copyright 2005 Eric Anholt * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * ERIC ANHOLT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * Authors: * Eric Anholt * */ #include "drmP.h" #include "drm.h" #include "via_drm.h" #include "via_drv.h" #include "drm_pciids.h" /* drv_PCI_IDs comes from drm_pciids.h, generated from drm_pciids.txt. */ static drm_pci_id_list_t via_pciidlist[] = { viadrv_PCI_IDS }; static void via_configure(drm_device_t *dev) { dev->driver.buf_priv_size = 1; dev->driver.load = via_driver_load; dev->driver.unload = via_driver_unload; dev->driver.context_ctor = via_init_context; dev->driver.context_dtor = via_final_context; dev->driver.vblank_wait = via_driver_vblank_wait; dev->driver.irq_preinstall = via_driver_irq_preinstall; dev->driver.irq_postinstall = via_driver_irq_postinstall; dev->driver.irq_uninstall = via_driver_irq_uninstall; dev->driver.irq_handler = via_driver_irq_handler; dev->driver.dma_quiescent = via_driver_dma_quiescent; dev->driver.ioctls = via_ioctls; dev->driver.max_ioctl = via_max_ioctl; dev->driver.name = DRIVER_NAME; dev->driver.desc = DRIVER_DESC; dev->driver.date = DRIVER_DATE; dev->driver.major = DRIVER_MAJOR; dev->driver.minor = DRIVER_MINOR; dev->driver.patchlevel = DRIVER_PATCHLEVEL; dev->driver.use_agp = 1; dev->driver.use_mtrr = 1; dev->driver.use_irq = 1; dev->driver.use_vbl_irq = 1; } #ifdef __FreeBSD__ static int via_probe(device_t dev) { return drm_probe(dev, via_pciidlist); } static int via_attach(device_t nbdev) { drm_device_t *dev = device_get_softc(nbdev); bzero(dev, sizeof(drm_device_t)); via_configure(dev); return drm_attach(nbdev, via_pciidlist); } static device_method_t via_methods[] = { /* Device interface */ DEVMETHOD(device_probe, via_probe), DEVMETHOD(device_attach, via_attach), DEVMETHOD(device_detach, drm_detach), { 0, 0 } }; static driver_t via_driver = { "drm", via_methods, sizeof(drm_device_t) }; extern devclass_t drm_devclass; DRIVER_MODULE(via, pci, via_driver, drm_devclass, 0, 0); MODULE_DEPEND(via, drm, 1, 1, 1); #elif defined(__NetBSD__) || defined(__OpenBSD__) #ifdef _LKM CFDRIVER_DECL(via, DV_TTY, NULL); #else CFATTACH_DECL(via, sizeof(drm_device_t), drm_probe, drm_attach, drm_detach, drm_activate); #endif #endif ' href='#n15'>15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214

/** 
 * \file drm_memory.h 
 * Memory management wrappers for DRM
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 */

/* 
 * Created: Thu Feb  4 14:00:34 1999 by faith@valinux.com
 *
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include <linux/config.h>
#include <linux/highmem.h>
#include "drmP.h"

/**
 * Cut down version of drm_memory_debug.h, which used to be called
 * drm_memory.h.  
 */

/* Need the 4-argument version of vmap().  */
#if __OS_HAS_AGP && defined(VMAP_4_ARGS)

#include <linux/vmalloc.h>

#ifdef HAVE_PAGE_AGP
#include <asm/agp.h>
#else
# ifdef __powerpc__
#  define PAGE_AGP	__pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE)
# else
#  define PAGE_AGP	PAGE_KERNEL
# endif
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
#ifndef pte_offset_kernel
# define pte_offset_kernel(dir, address)	pte_offset(dir, address)
#endif
#ifndef pte_pfn
# define pte_pfn(pte)				(pte_page(pte) - mem_map)
#endif
#ifndef pfn_to_page
# define pfn_to_page(pfn)			(mem_map + (pfn))
#endif
#endif

/*
 * Find the drm_map that covers the range [offset, offset+size).
 */
static inline drm_map_t *
drm_lookup_map (unsigned long offset, unsigned long size, drm_device_t *dev)
{
	struct list_head *list;
	drm_map_list_t *r_list;
	drm_map_t *map;

	list_for_each(list, &dev->maplist->head) {
		r_list = (drm_map_list_t *) list;
		map = r_list->map;
		if (!map)
			continue;
		if (map->offset <= offset && (offset + size) <= (map->offset + map->size))
			return map;
	}
	return NULL;
}

static inline void *
agp_remap (unsigned long offset, unsigned long size, drm_device_t *dev)
{
	unsigned long *phys_addr_map, i, num_pages = PAGE_ALIGN(size) / PAGE_SIZE;
	struct drm_agp_mem *agpmem;
	struct page **page_map;
	void *addr;

	size = PAGE_ALIGN(size);

#ifdef __alpha__
	offset -= dev->hose->mem_space->start;
#endif

	for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next)
		if (agpmem->bound <= offset
		    && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= (offset + size))
			break;
	if (!agpmem)
		return NULL;

	/*
	 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
	 * the CPU do not get remapped by the GART.  We fix this by using the kernel's
	 * page-table instead (that's probably faster anyhow...).
	 */
	/* note: use vmalloc() because num_pages could be large... */
	page_map = vmalloc(num_pages * sizeof(struct page *));
	if (!page_map)
		return NULL;

	phys_addr_map = agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE;
	for (i = 0; i < num_pages; ++i)
		page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT);
	addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
	vfree(page_map);

	return addr;
}

static inline unsigned long
drm_follow_page (void *vaddr)
{
	pgd_t *pgd = pgd_offset_k((unsigned long) vaddr);
	pmd_t *pmd = pmd_offset(pgd, (unsigned long) vaddr);
	pte_t *ptep = pte_offset_kernel(pmd, (unsigned long) vaddr);
	return pte_pfn(*ptep) << PAGE_SHIFT;
}

#else /* __OS_HAS_AGP */

static inline drm_map_t *drm_lookup_map(unsigned long offset, unsigned long size, drm_device_t *dev)
{
  return NULL;
}

static inline void *agp_remap(unsigned long offset, unsigned long size, drm_device_t *dev)
{
  return NULL;
}

static inline unsigned long drm_follow_page (void *vaddr)
{
  return 0;
}

#endif

static inline void *drm_ioremap(unsigned long offset, unsigned long size, drm_device_t *dev)
{
#if defined(VMAP_4_ARGS)
	if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture) {
		drm_map_t *map = drm_lookup_map(offset, size, dev);

		if (map && map->type == _DRM_AGP)
			return agp_remap(offset, size, dev);
	}
#endif

	return ioremap(offset, size);
}

static inline void *drm_ioremap_nocache(unsigned long offset, unsigned long size,
					drm_device_t *dev)
{
#if defined(VMAP_4_ARGS)
	if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture) {
		drm_map_t *map = drm_lookup_map(offset, size, dev);

		if (map && map->type == _DRM_AGP)
			return agp_remap(offset, size, dev);
	}
#endif

	return ioremap_nocache(offset, size);
}

static inline void drm_ioremapfree(void *pt, unsigned long size, drm_device_t *dev)
{
#if defined(VMAP_4_ARGS)
	/*
	 * This is a bit ugly.  It would be much cleaner if the DRM API would use separate
	 * routines for handling mappings in the AGP space.  Hopefully this can be done in
	 * a future revision of the interface...
	 */
	if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture
	    && ((unsigned long) pt >= VMALLOC_START && (unsigned long) pt < VMALLOC_END))
	{
		unsigned long offset;
		drm_map_t *map;

		offset = drm_follow_page(pt) | ((unsigned long) pt & ~PAGE_MASK);
		map = drm_lookup_map(offset, size, dev);
		if (map && map->type == _DRM_AGP) {
			vunmap(pt);
			return;
		}
	}
#endif

	iounmap(pt);
}