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      1 /*	$NetBSD: nouveau_nvkm_subdev_bios_shadowpci.c,v 1.5 2021/12/18 23:45:38 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2012 Red Hat Inc.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     22  * OTHER DEALINGS IN THE SOFTWARE.
     23  *
     24  */
     25 #include <sys/cdefs.h>
     26 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_shadowpci.c,v 1.5 2021/12/18 23:45:38 riastradh Exp $");
     27 
     28 #include "priv.h"
     29 
     30 #include <core/pci.h>
     31 
     32 #ifdef __NetBSD__
     33 #  define	__iomem	__pci_rom_iomem
     34 #endif
     35 
     36 struct priv {
     37 	struct pci_dev *pdev;
     38 	void __iomem *rom;
     39 	size_t size;
     40 };
     41 
     42 static u32
     43 pcirom_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
     44 {
     45 	struct priv *priv = data;
     46 	if (offset + length <= priv->size) {
     47 		memcpy_fromio(bios->data + offset, priv->rom + offset, length);
     48 		return length;
     49 	}
     50 	return 0;
     51 }
     52 
     53 static void
     54 pcirom_fini(void *data)
     55 {
     56 	struct priv *priv = data;
     57 	pci_unmap_rom(priv->pdev, priv->rom);
     58 	pci_disable_rom(priv->pdev);
     59 	kfree(priv);
     60 }
     61 
     62 static void *
     63 pcirom_init(struct nvkm_bios *bios, const char *name)
     64 {
     65 	struct nvkm_device *device = bios->subdev.device;
     66 	struct priv *priv = NULL;
     67 	struct pci_dev *pdev;
     68 	int ret;
     69 
     70 	if (device->func->pci)
     71 		pdev = device->func->pci(device)->pdev;
     72 	else
     73 		return ERR_PTR(-ENODEV);
     74 
     75 	if (!(ret = pci_enable_rom(pdev))) {
     76 		if (ret = -ENOMEM,
     77 		    (priv = kmalloc(sizeof(*priv), GFP_KERNEL))) {
     78 			if (ret = -EFAULT,
     79 			    (priv->rom = pci_map_rom(pdev, &priv->size))) {
     80 				priv->pdev = pdev;
     81 				return priv;
     82 			}
     83 			kfree(priv);
     84 		}
     85 		pci_disable_rom(pdev);
     86 	}
     87 
     88 	return ERR_PTR(ret);
     89 }
     90 
     91 const struct nvbios_source
     92 nvbios_pcirom = {
     93 	.name = "PCIROM",
     94 	.init = pcirom_init,
     95 	.fini = pcirom_fini,
     96 	.read = pcirom_read,
     97 	.rw = true,
     98 };
     99 
    100 static void *
    101 platform_init(struct nvkm_bios *bios, const char *name)
    102 {
    103 	struct nvkm_device *device = bios->subdev.device;
    104 	struct pci_dev *pdev;
    105 	struct priv *priv;
    106 	int ret = -ENOMEM;
    107 
    108 	if (device->func->pci)
    109 		pdev = device->func->pci(device)->pdev;
    110 	else
    111 		return ERR_PTR(-ENODEV);
    112 
    113 	if ((priv = kmalloc(sizeof(*priv), GFP_KERNEL))) {
    114 		if (ret = -ENODEV,
    115 		    (priv->rom = pci_platform_rom(pdev, &priv->size)))
    116 			return priv;
    117 		kfree(priv);
    118 	}
    119 
    120 	return ERR_PTR(ret);
    121 }
    122 
    123 const struct nvbios_source
    124 nvbios_platform = {
    125 	.name = "PLATFORM",
    126 	.init = platform_init,
    127 	.fini = (void(*)(void *))kfree,
    128 	.read = pcirom_read,
    129 	.rw = true,
    130 };
    131