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linux/drivers/gpu/drm/mgag200/mgag200_drv.c
Javier Martinez Canillas 6a2d2ddf2c drm: Move nomodeset kernel parameter to the DRM subsystem 
The "nomodeset" kernel cmdline parameter is handled by the vgacon driver
but the exported vgacon_text_force() symbol is only used by DRM drivers.

It makes much more sense for the parameter logic to be in the subsystem
of the drivers that are making use of it.

Let's move the vgacon_text_force() function and related logic to the DRM
subsystem. While doing that, rename it to drm_firmware_drivers_only() and
make it return true if "nomodeset" was used and false otherwise. This is
a better description of the condition that the drivers are testing for.

Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211112133230.1595307-4-javierm@redhat.com
2021-11-27 13:52:22 +01:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2012 Red Hat
*
* Authors: Matthew Garrett
* Dave Airlie
*/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/vmalloc.h>
#include <drm/drm_aperture.h>
#include <drm/drm_drv.h>
#include <drm/drm_file.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_pciids.h>
#include "mgag200_drv.h"
int mgag200_modeset = -1;
MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
module_param_named(modeset, mgag200_modeset, int, 0400);
/*
* DRM driver
*/
DEFINE_DRM_GEM_FOPS(mgag200_driver_fops);
static const struct drm_driver mgag200_driver = {
.driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
.fops = &mgag200_driver_fops,
.name = DRIVER_NAME,
.desc = DRIVER_DESC,
.date = DRIVER_DATE,
.major = DRIVER_MAJOR,
.minor = DRIVER_MINOR,
.patchlevel = DRIVER_PATCHLEVEL,
DRM_GEM_SHMEM_DRIVER_OPS,
};
/*
* DRM device
*/
static bool mgag200_has_sgram(struct mga_device *mdev)
{
struct drm_device *dev = &mdev->base;
struct pci_dev *pdev = to_pci_dev(dev->dev);
u32 option;
int ret;
ret = pci_read_config_dword(pdev, PCI_MGA_OPTION, &option);
if (drm_WARN(dev, ret, "failed to read PCI config dword: %d\n", ret))
return false;
return !!(option & PCI_MGA_OPTION_HARDPWMSK);
}
static int mgag200_regs_init(struct mga_device *mdev)
{
struct drm_device *dev = &mdev->base;
struct pci_dev *pdev = to_pci_dev(dev->dev);
u32 option, option2;
u8 crtcext3;
switch (mdev->type) {
case G200_PCI:
case G200_AGP:
if (mgag200_has_sgram(mdev))
option = 0x4049cd21;
else
option = 0x40499121;
option2 = 0x00008000;
break;
case G200_SE_A:
case G200_SE_B:
option = 0x40049120;
if (mgag200_has_sgram(mdev))
option |= PCI_MGA_OPTION_HARDPWMSK;
option2 = 0x00008000;
break;
case G200_WB:
case G200_EW3:
option = 0x41049120;
option2 = 0x0000b000;
break;
case G200_EV:
option = 0x00000120;
option2 = 0x0000b000;
break;
case G200_EH:
case G200_EH3:
option = 0x00000120;
option2 = 0x0000b000;
break;
default:
option = 0;
option2 = 0;
}
if (option)
pci_write_config_dword(pdev, PCI_MGA_OPTION, option);
if (option2)
pci_write_config_dword(pdev, PCI_MGA_OPTION2, option2);
/* BAR 1 contains registers */
mdev->rmmio_base = pci_resource_start(pdev, 1);
mdev->rmmio_size = pci_resource_len(pdev, 1);
if (!devm_request_mem_region(dev->dev, mdev->rmmio_base,
mdev->rmmio_size, "mgadrmfb_mmio")) {
drm_err(dev, "can't reserve mmio registers\n");
return -ENOMEM;
}
mdev->rmmio = pcim_iomap(pdev, 1, 0);
if (mdev->rmmio == NULL)
return -ENOMEM;
RREG_ECRT(0x03, crtcext3);
crtcext3 |= MGAREG_CRTCEXT3_MGAMODE;
WREG_ECRT(0x03, crtcext3);
return 0;
}
static void mgag200_g200_interpret_bios(struct mga_device *mdev,
const unsigned char *bios,
size_t size)
{
static const char matrox[] = {'M', 'A', 'T', 'R', 'O', 'X'};
static const unsigned int expected_length[6] = {
0, 64, 64, 64, 128, 128
};
struct drm_device *dev = &mdev->base;
const unsigned char *pins;
unsigned int pins_len, version;
int offset;
int tmp;
/* Test for MATROX string. */
if (size < 45 + sizeof(matrox))
return;
if (memcmp(&bios[45], matrox, sizeof(matrox)) != 0)
return;
/* Get the PInS offset. */
if (size < MGA_BIOS_OFFSET + 2)
return;
offset = (bios[MGA_BIOS_OFFSET + 1] << 8) | bios[MGA_BIOS_OFFSET];
/* Get PInS data structure. */
if (size < offset + 6)
return;
pins = bios + offset;
if (pins[0] == 0x2e && pins[1] == 0x41) {
version = pins[5];
pins_len = pins[2];
} else {
version = 1;
pins_len = pins[0] + (pins[1] << 8);
}
if (version < 1 || version > 5) {
drm_warn(dev, "Unknown BIOS PInS version: %d\n", version);
return;
}
if (pins_len != expected_length[version]) {
drm_warn(dev, "Unexpected BIOS PInS size: %d expected: %d\n",
pins_len, expected_length[version]);
return;
}
if (size < offset + pins_len)
return;
drm_dbg_kms(dev, "MATROX BIOS PInS version %d size: %d found\n",
version, pins_len);
/* Extract the clock values */
switch (version) {
case 1:
tmp = pins[24] + (pins[25] << 8);
if (tmp)
mdev->model.g200.pclk_max = tmp * 10;
break;
case 2:
if (pins[41] != 0xff)
mdev->model.g200.pclk_max = (pins[41] + 100) * 1000;
break;
case 3:
if (pins[36] != 0xff)
mdev->model.g200.pclk_max = (pins[36] + 100) * 1000;
if (pins[52] & 0x20)
mdev->model.g200.ref_clk = 14318;
break;
case 4:
if (pins[39] != 0xff)
mdev->model.g200.pclk_max = pins[39] * 4 * 1000;
if (pins[92] & 0x01)
mdev->model.g200.ref_clk = 14318;
break;
case 5:
tmp = pins[4] ? 8000 : 6000;
if (pins[123] != 0xff)
mdev->model.g200.pclk_min = pins[123] * tmp;
if (pins[38] != 0xff)
mdev->model.g200.pclk_max = pins[38] * tmp;
if (pins[110] & 0x01)
mdev->model.g200.ref_clk = 14318;
break;
default:
break;
}
}
static void mgag200_g200_init_refclk(struct mga_device *mdev)
{
struct drm_device *dev = &mdev->base;
struct pci_dev *pdev = to_pci_dev(dev->dev);
unsigned char __iomem *rom;
unsigned char *bios;
size_t size;
mdev->model.g200.pclk_min = 50000;
mdev->model.g200.pclk_max = 230000;
mdev->model.g200.ref_clk = 27050;
rom = pci_map_rom(pdev, &size);
if (!rom)
return;
bios = vmalloc(size);
if (!bios)
goto out;
memcpy_fromio(bios, rom, size);
if (size != 0 && bios[0] == 0x55 && bios[1] == 0xaa)
mgag200_g200_interpret_bios(mdev, bios, size);
drm_dbg_kms(dev, "pclk_min: %ld pclk_max: %ld ref_clk: %ld\n",
mdev->model.g200.pclk_min, mdev->model.g200.pclk_max,
mdev->model.g200.ref_clk);
vfree(bios);
out:
pci_unmap_rom(pdev, rom);
}
static void mgag200_g200se_init_unique_id(struct mga_device *mdev)
{
struct drm_device *dev = &mdev->base;
/* stash G200 SE model number for later use */
mdev->model.g200se.unique_rev_id = RREG32(0x1e24);
drm_dbg(dev, "G200 SE unique revision id is 0x%x\n",
mdev->model.g200se.unique_rev_id);
}
static struct mga_device *
mgag200_device_create(struct pci_dev *pdev, enum mga_type type, unsigned long flags)
{
struct mga_device *mdev;
struct drm_device *dev;
int ret;
mdev = devm_drm_dev_alloc(&pdev->dev, &mgag200_driver, struct mga_device, base);
if (IS_ERR(mdev))
return mdev;
dev = &mdev->base;
pci_set_drvdata(pdev, dev);
mdev->flags = flags;
mdev->type = type;
ret = mgag200_regs_init(mdev);
if (ret)
return ERR_PTR(ret);
if (mdev->type == G200_PCI || mdev->type == G200_AGP)
mgag200_g200_init_refclk(mdev);
else if (IS_G200_SE(mdev))
mgag200_g200se_init_unique_id(mdev);
ret = mgag200_mm_init(mdev);
if (ret)
return ERR_PTR(ret);
ret = mgag200_modeset_init(mdev);
if (ret)
return ERR_PTR(ret);
return mdev;
}
/*
* PCI driver
*/
static const struct pci_device_id mgag200_pciidlist[] = {
{ PCI_VENDOR_ID_MATROX, 0x520, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_PCI },
{ PCI_VENDOR_ID_MATROX, 0x521, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_AGP },
{ PCI_VENDOR_ID_MATROX, 0x522, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
G200_SE_A | MGAG200_FLAG_HW_BUG_NO_STARTADD},
{ PCI_VENDOR_ID_MATROX, 0x524, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_SE_B },
{ PCI_VENDOR_ID_MATROX, 0x530, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_EV },
{ PCI_VENDOR_ID_MATROX, 0x532, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_WB },
{ PCI_VENDOR_ID_MATROX, 0x533, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_EH },
{ PCI_VENDOR_ID_MATROX, 0x534, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_ER },
{ PCI_VENDOR_ID_MATROX, 0x536, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_EW3 },
{ PCI_VENDOR_ID_MATROX, 0x538, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_EH3 },
{0,}
};
MODULE_DEVICE_TABLE(pci, mgag200_pciidlist);
static enum mga_type mgag200_type_from_driver_data(kernel_ulong_t driver_data)
{
return (enum mga_type)(driver_data & MGAG200_TYPE_MASK);
}
static unsigned long mgag200_flags_from_driver_data(kernel_ulong_t driver_data)
{
return driver_data & MGAG200_FLAG_MASK;
}
static int
mgag200_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
kernel_ulong_t driver_data = ent->driver_data;
enum mga_type type = mgag200_type_from_driver_data(driver_data);
unsigned long flags = mgag200_flags_from_driver_data(driver_data);
struct mga_device *mdev;
struct drm_device *dev;
int ret;
ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &mgag200_driver);
if (ret)
return ret;
ret = pcim_enable_device(pdev);
if (ret)
return ret;
mdev = mgag200_device_create(pdev, type, flags);
if (IS_ERR(mdev))
return PTR_ERR(mdev);
dev = &mdev->base;
ret = drm_dev_register(dev, 0);
if (ret)
return ret;
drm_fbdev_generic_setup(dev, 0);
return 0;
}
static void mgag200_pci_remove(struct pci_dev *pdev)
{
struct drm_device *dev = pci_get_drvdata(pdev);
drm_dev_unregister(dev);
}
static struct pci_driver mgag200_pci_driver = {
.name = DRIVER_NAME,
.id_table = mgag200_pciidlist,
.probe = mgag200_pci_probe,
.remove = mgag200_pci_remove,
};
static int __init mgag200_init(void)
{
if (drm_firmware_drivers_only() && mgag200_modeset == -1)
return -EINVAL;
if (mgag200_modeset == 0)
return -EINVAL;
return pci_register_driver(&mgag200_pci_driver);
}
static void __exit mgag200_exit(void)
{
pci_unregister_driver(&mgag200_pci_driver);
}
module_init(mgag200_init);
module_exit(mgag200_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
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