/*
* Copyright 1998-2009 VIA Technologies, Inc. All Rights Reserved.
* Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
* Copyright 2009 Jonathan Corbet <corbet@lwn.net>
*/
/*
* Core code for the Via multifunction framebuffer device.
*/
#include "via-core.h"
#include "via_i2c.h"
#include "via-gpio.h"
#include "global.h"
#include <linux/module.h>
#include <linux/platform_device.h>
/*
* The default port config.
*/
static struct via_port_cfg adap_configs[] = {
[VIA_PORT_26] = { VIA_PORT_I2C, VIA_MODE_OFF, VIASR, 0x26 },
[VIA_PORT_31] = { VIA_PORT_I2C, VIA_MODE_I2C, VIASR, 0x31 },
[VIA_PORT_25] = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x25 },
[VIA_PORT_2C] = { VIA_PORT_GPIO, VIA_MODE_I2C, VIASR, 0x2c },
[VIA_PORT_3D] = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x3d },
{ 0, 0, 0, 0 }
};
/*
* We currently only support one viafb device (will there ever be
* more than one?), so just declare it globally here.
*/
static struct viafb_dev global_dev;
/*
* Figure out how big our framebuffer memory is. Kind of ugly,
* but evidently we can't trust the information found in the
* fbdev configuration area.
*/
static u16 via_function3[] = {
CLE266_FUNCTION3, KM400_FUNCTION3, CN400_FUNCTION3, CN700_FUNCTION3,
CX700_FUNCTION3, KM800_FUNCTION3, KM890_FUNCTION3, P4M890_FUNCTION3,
P4M900_FUNCTION3, VX800_FUNCTION3, VX855_FUNCTION3,
};
/* Get the BIOS-configured framebuffer size from PCI configuration space
* of function 3 in the respective chipset */
static int viafb_get_fb_size_from_pci(int chip_type)
{
int i;
u8 offset = 0;
u32 FBSize;
u32 VideoMemSize;
/* search for the "FUNCTION3" device in this chipset */
for (i = 0; i < ARRAY_SIZE(via_function3); i++) {
struct pci_dev *pdev;
pdev = pci_get_device(PCI_VENDOR_ID_VIA, via_function3[i],
NULL);
if (!pdev)
continue;
DEBUG_MSG(KERN_INFO "Device ID = %x\n", pdev->device);
switch (pdev->device) {
case CLE266_FUNCTION3:
case KM400_FUNCTION3:
offset = 0xE0;
break;
case CN400_FUNCTION3:
case CN700_FUNCTION3:
case CX700_FUNCTION3:
case KM800_FUNCTION3:
case KM890_FUNCTION3:
case P4M890_FUNCTION3:
case P4M900_FUNCTION3:
case VX800_FUNCTION3:
case VX855_FUNCTION3:
/*case CN750_FUNCTION3: */
offset = 0xA0;
break;
}
if (!offset)
break;
pci_read_config_dword(pdev, offset, &FBSize);
pci_dev_put(pdev);
}
if (!offset) {
printk(KERN_ERR "cannot determine framebuffer size\n");
return -EIO;
}
FBSize = FBSize & 0x00007000;
DEBUG_MSG(KERN_INFO "FB Size = %x\n", FBSize);
if (chip_type < UNICHROME_CX700) {
switch (FBSize) {
case 0x00004000:
VideoMemSize = (16 << 20); /*16M */
break;
case 0x00005000:
VideoMemSize = (32 << 20); /*32M */
break;
case 0x00006000:
VideoMemSize = (64 << 20); /*64M */
break;
default:
VideoMemSize = (32 << 20); /*32M */
break;
}
} else {
switch (FBSize) {
case 0x00001000:
VideoMemSize = (8 << 20); /*8M */
break;
case 0x00002000:
VideoMemSize = (16 << 20); /*16M */
break;
case 0x00003000:
VideoMemSize = (32 << 20); /*32M */
break;
case 0x00004000:
VideoMemSize = (64 << 20); /*64M */
break;
case 0x00005000:
VideoMemSize = (128 << 20); /*128M */
break;
case 0x00006000:
VideoMemSize = (256 << 20); /*256M */
break;
case 0x00007000: /* Only on VX855/875 */
VideoMemSize = (512 << 20); /*512M */
break;
default:
VideoMemSize = (32 << 20); /*32M */
break;
}
}
return VideoMemSize;
}
/*
* Figure out and map our MMIO regions.
*/
static int __devinit via_pci_setup_mmio(struct viafb_dev *vdev)
{
/*
* Hook up to the device registers.
*/
vdev->engine_start = pci_resource_start(vdev->pdev, 1);
vdev->engine_len = pci_resource_len(vdev->pdev, 1);
/* If this fails, others will notice later */
vdev->engine_mmio = ioremap_nocache(vdev->engine_start,
vdev->engine_len);
/*
* Likewise with I/O memory.
*/
vdev->fbmem_start = pci_resource_start(vdev->pdev, 0);
vdev->fbmem_len = viafb_get_fb_size_from_pci(vdev->chip_type);
if (vdev->fbmem_len < 0)
return vdev->fbmem_len;
vdev->fbmem = ioremap_nocache(vdev->fbmem_start, vdev->fbmem_len);
if (vdev->fbmem == NULL)
return -ENOMEM;
return 0;
}
static void __devexit via_pci_teardown_mmio(struct viafb_dev *vdev)
{
iounmap(vdev->fbmem);
iounmap(vdev->engine_mmio);
}
static int __devinit via_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
int ret;
ret = pci_enable_device(pdev);
if (ret)
return ret;
/*
* Global device initialization.
*/
memset(&global_dev, 0, sizeof(global_dev));
global_dev.pdev = pdev;
global_dev.chip_type = ent->driver_data;
spin_lock_init(&global_dev.reg_lock);
ret = via_pci_setup_mmio(&global_dev);
if (ret)
goto out_disable;
/*
* Create the I2C busses. Bailing out on failure seems extreme,
* but that's what the code did before.
*/
ret = viafb_create_i2c_busses(adap_configs);
if (ret)
goto out_teardown;
/*
* Set up the framebuffer.
*/
ret = via_fb_pci_probe(&global_dev);
if (ret)
goto out_i2c;
/*
* Create the GPIOs. We continue whether or not this succeeds;
* the framebuffer might be useful even without GPIO ports.
*/
ret = viafb_create_gpios(&global_dev, adap_configs);
return 0;
out_i2c:
viafb_delete_i2c_busses();
out_teardown:
via_pci_teardown_mmio(&global_dev);
out_disable:
pci_disable_device(pdev);
return ret;
}
static void __devexit via_pci_remove(struct pci_dev *pdev)
{
viafb_destroy_gpios();
viafb_delete_i2c_busses();
via_fb_pci_remove(pdev);
via_pci_teardown_mmio(&global_dev);
pci_disable_device(pdev);
}
static struct pci_device_id via_pci_table[] __devinitdata = {
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CLE266_DID),
.driver_data = UNICHROME_CLE266 },
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_PM800_DID),
.driver_data = UNICHROME_PM800 },
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K400_DID),
.driver_data = UNICHROME_K400 },
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K800_DID),
.driver_data = UNICHROME_K800 },
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_P4M890_DID),
.driver_data = UNICHROME_CN700 },
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K8M890_DID),
.driver_data = UNICHROME_K8M890 },
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CX700_DID),
.driver_data = UNICHROME_CX700 },
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_P4M900_DID),
.driver_data = UNICHROME_P4M900 },
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CN750_DID),
.driver_data = UNICHROME_CN750 },
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_VX800_DID),
.driver_data = UNICHROME_VX800 },
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_VX855_DID),
.driver_data = UNICHROME_VX855 },
{ }
};
MODULE_DEVICE_TABLE(pci, via_pci_table);
static struct pci_driver via_driver = {
.name = "viafb",
.id_table = via_pci_table,
.probe = via_pci_probe,
.remove = __devexit_p(via_pci_remove),
};
static int __init via_core_init(void)
{
int ret;
ret = viafb_init();
if (ret)
return ret;
return pci_register_driver(&via_driver);
}
static void __exit via_core_exit(void)
{
pci_unregister_driver(&via_driver);
viafb_exit();
}
module_init(via_core_init);
module_exit(via_core_exit);
