forked from Minki/linux
94dd1a856b
The viafb device shares a single interrupt control register among several distinct subunits. This adds a simple layer for management of that register. Cc: ScottFang@viatech.com.cn Cc: JosephChan@via.com.tw Cc: Harald Welte <laforge@gnumonks.org> Acked-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
424 lines
9.8 KiB
C
424 lines
9.8 KiB
C
/*
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* Copyright 1998-2009 VIA Technologies, Inc. All Rights Reserved.
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* Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
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* Copyright 2009 Jonathan Corbet <corbet@lwn.net>
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*/
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/*
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* Core code for the Via multifunction framebuffer device.
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*/
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#include "via-core.h"
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#include "via_i2c.h"
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#include "via-gpio.h"
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#include "global.h"
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#include <linux/module.h>
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#include <linux/platform_device.h>
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/*
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* The default port config.
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*/
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static struct via_port_cfg adap_configs[] = {
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[VIA_PORT_26] = { VIA_PORT_I2C, VIA_MODE_OFF, VIASR, 0x26 },
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[VIA_PORT_31] = { VIA_PORT_I2C, VIA_MODE_I2C, VIASR, 0x31 },
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[VIA_PORT_25] = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x25 },
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[VIA_PORT_2C] = { VIA_PORT_GPIO, VIA_MODE_I2C, VIASR, 0x2c },
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[VIA_PORT_3D] = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x3d },
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{ 0, 0, 0, 0 }
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};
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/*
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* We currently only support one viafb device (will there ever be
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* more than one?), so just declare it globally here.
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*/
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static struct viafb_dev global_dev;
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/*
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* Basic register access; spinlock required.
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*/
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static inline void viafb_mmio_write(int reg, u32 v)
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{
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iowrite32(v, global_dev.engine_mmio + reg);
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}
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static inline int viafb_mmio_read(int reg)
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{
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return ioread32(global_dev.engine_mmio + reg);
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}
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/* ---------------------------------------------------------------------- */
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/*
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* Interrupt management. We have a single IRQ line for a lot of
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* different functions, so we need to share it. The design here
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* is that we don't want to reimplement the shared IRQ code here;
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* we also want to avoid having contention for a single handler thread.
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* So each subdev driver which needs interrupts just requests
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* them directly from the kernel. We just have what's needed for
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* overall access to the interrupt control register.
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*/
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/*
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* Which interrupts are enabled now?
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*/
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static u32 viafb_enabled_ints;
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static void viafb_int_init(void)
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{
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viafb_enabled_ints = 0;
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viafb_mmio_write(VDE_INTERRUPT, 0);
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}
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/*
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* Allow subdevs to ask for specific interrupts to be enabled. These
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* functions must be called with reg_lock held
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*/
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void viafb_irq_enable(u32 mask)
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{
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viafb_enabled_ints |= mask;
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viafb_mmio_write(VDE_INTERRUPT, viafb_enabled_ints | VDE_I_ENABLE);
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}
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EXPORT_SYMBOL_GPL(viafb_irq_enable);
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void viafb_irq_disable(u32 mask)
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{
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viafb_enabled_ints &= ~mask;
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if (viafb_enabled_ints == 0)
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viafb_mmio_write(VDE_INTERRUPT, 0); /* Disable entirely */
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else
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viafb_mmio_write(VDE_INTERRUPT,
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viafb_enabled_ints | VDE_I_ENABLE);
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}
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EXPORT_SYMBOL_GPL(viafb_irq_disable);
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/*
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* Figure out how big our framebuffer memory is. Kind of ugly,
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* but evidently we can't trust the information found in the
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* fbdev configuration area.
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*/
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static u16 via_function3[] = {
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CLE266_FUNCTION3, KM400_FUNCTION3, CN400_FUNCTION3, CN700_FUNCTION3,
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CX700_FUNCTION3, KM800_FUNCTION3, KM890_FUNCTION3, P4M890_FUNCTION3,
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P4M900_FUNCTION3, VX800_FUNCTION3, VX855_FUNCTION3,
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};
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/* Get the BIOS-configured framebuffer size from PCI configuration space
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* of function 3 in the respective chipset */
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static int viafb_get_fb_size_from_pci(int chip_type)
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{
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int i;
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u8 offset = 0;
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u32 FBSize;
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u32 VideoMemSize;
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/* search for the "FUNCTION3" device in this chipset */
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for (i = 0; i < ARRAY_SIZE(via_function3); i++) {
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struct pci_dev *pdev;
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pdev = pci_get_device(PCI_VENDOR_ID_VIA, via_function3[i],
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NULL);
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if (!pdev)
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continue;
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DEBUG_MSG(KERN_INFO "Device ID = %x\n", pdev->device);
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switch (pdev->device) {
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case CLE266_FUNCTION3:
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case KM400_FUNCTION3:
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offset = 0xE0;
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break;
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case CN400_FUNCTION3:
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case CN700_FUNCTION3:
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case CX700_FUNCTION3:
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case KM800_FUNCTION3:
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case KM890_FUNCTION3:
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case P4M890_FUNCTION3:
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case P4M900_FUNCTION3:
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case VX800_FUNCTION3:
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case VX855_FUNCTION3:
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/*case CN750_FUNCTION3: */
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offset = 0xA0;
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break;
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}
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if (!offset)
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break;
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pci_read_config_dword(pdev, offset, &FBSize);
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pci_dev_put(pdev);
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}
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if (!offset) {
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printk(KERN_ERR "cannot determine framebuffer size\n");
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return -EIO;
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}
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FBSize = FBSize & 0x00007000;
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DEBUG_MSG(KERN_INFO "FB Size = %x\n", FBSize);
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if (chip_type < UNICHROME_CX700) {
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switch (FBSize) {
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case 0x00004000:
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VideoMemSize = (16 << 20); /*16M */
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break;
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case 0x00005000:
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VideoMemSize = (32 << 20); /*32M */
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break;
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case 0x00006000:
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VideoMemSize = (64 << 20); /*64M */
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break;
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default:
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VideoMemSize = (32 << 20); /*32M */
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break;
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}
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} else {
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switch (FBSize) {
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case 0x00001000:
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VideoMemSize = (8 << 20); /*8M */
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break;
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case 0x00002000:
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VideoMemSize = (16 << 20); /*16M */
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break;
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case 0x00003000:
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VideoMemSize = (32 << 20); /*32M */
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break;
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case 0x00004000:
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VideoMemSize = (64 << 20); /*64M */
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break;
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case 0x00005000:
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VideoMemSize = (128 << 20); /*128M */
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break;
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case 0x00006000:
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VideoMemSize = (256 << 20); /*256M */
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break;
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case 0x00007000: /* Only on VX855/875 */
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VideoMemSize = (512 << 20); /*512M */
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break;
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default:
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VideoMemSize = (32 << 20); /*32M */
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break;
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}
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}
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return VideoMemSize;
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}
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/*
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* Figure out and map our MMIO regions.
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*/
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static int __devinit via_pci_setup_mmio(struct viafb_dev *vdev)
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{
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/*
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* Hook up to the device registers.
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*/
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vdev->engine_start = pci_resource_start(vdev->pdev, 1);
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vdev->engine_len = pci_resource_len(vdev->pdev, 1);
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/* If this fails, others will notice later */
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vdev->engine_mmio = ioremap_nocache(vdev->engine_start,
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vdev->engine_len);
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/*
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* Likewise with I/O memory.
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*/
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vdev->fbmem_start = pci_resource_start(vdev->pdev, 0);
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vdev->fbmem_len = viafb_get_fb_size_from_pci(vdev->chip_type);
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if (vdev->fbmem_len < 0)
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return vdev->fbmem_len;
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vdev->fbmem = ioremap_nocache(vdev->fbmem_start, vdev->fbmem_len);
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if (vdev->fbmem == NULL)
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return -ENOMEM;
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return 0;
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}
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static void __devexit via_pci_teardown_mmio(struct viafb_dev *vdev)
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{
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iounmap(vdev->fbmem);
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iounmap(vdev->engine_mmio);
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}
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/*
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* Create our subsidiary devices.
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*/
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static struct viafb_subdev_info {
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char *name;
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struct platform_device *platdev;
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} viafb_subdevs[] = {
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{
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.name = "viafb-gpio",
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},
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{
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.name = "viafb-i2c",
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}
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};
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#define N_SUBDEVS ARRAY_SIZE(viafb_subdevs)
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static int __devinit via_create_subdev(struct viafb_dev *vdev,
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struct viafb_subdev_info *info)
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{
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int ret;
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info->platdev = platform_device_alloc(info->name, -1);
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if (!info->platdev) {
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dev_err(&vdev->pdev->dev, "Unable to allocate pdev %s\n",
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info->name);
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return -ENOMEM;
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}
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info->platdev->dev.parent = &vdev->pdev->dev;
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info->platdev->dev.platform_data = vdev;
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ret = platform_device_add(info->platdev);
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if (ret) {
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dev_err(&vdev->pdev->dev, "Unable to add pdev %s\n",
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info->name);
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platform_device_put(info->platdev);
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info->platdev = NULL;
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}
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return ret;
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}
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static int __devinit via_setup_subdevs(struct viafb_dev *vdev)
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{
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int i;
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/*
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* Ignore return values. Even if some of the devices
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* fail to be created, we'll still be able to use some
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* of the rest.
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*/
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for (i = 0; i < N_SUBDEVS; i++)
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via_create_subdev(vdev, viafb_subdevs + i);
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return 0;
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}
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static void __devexit via_teardown_subdevs(void)
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{
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int i;
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for (i = 0; i < N_SUBDEVS; i++)
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if (viafb_subdevs[i].platdev) {
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viafb_subdevs[i].platdev->dev.platform_data = NULL;
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platform_device_unregister(viafb_subdevs[i].platdev);
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}
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}
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static int __devinit via_pci_probe(struct pci_dev *pdev,
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const struct pci_device_id *ent)
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{
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int ret;
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ret = pci_enable_device(pdev);
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if (ret)
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return ret;
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/*
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* Global device initialization.
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*/
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memset(&global_dev, 0, sizeof(global_dev));
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global_dev.pdev = pdev;
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global_dev.chip_type = ent->driver_data;
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global_dev.port_cfg = adap_configs;
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spin_lock_init(&global_dev.reg_lock);
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ret = via_pci_setup_mmio(&global_dev);
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if (ret)
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goto out_disable;
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/*
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* Set up interrupts and create our subdevices. Continue even if
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* some things fail.
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*/
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viafb_int_init();
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via_setup_subdevs(&global_dev);
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/*
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* Set up the framebuffer.
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*/
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ret = via_fb_pci_probe(&global_dev);
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if (ret)
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goto out_subdevs;
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return 0;
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out_subdevs:
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via_teardown_subdevs();
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via_pci_teardown_mmio(&global_dev);
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out_disable:
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pci_disable_device(pdev);
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return ret;
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}
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static void __devexit via_pci_remove(struct pci_dev *pdev)
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{
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via_teardown_subdevs();
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via_fb_pci_remove(pdev);
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via_pci_teardown_mmio(&global_dev);
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pci_disable_device(pdev);
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}
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static struct pci_device_id via_pci_table[] __devinitdata = {
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CLE266_DID),
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.driver_data = UNICHROME_CLE266 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_PM800_DID),
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.driver_data = UNICHROME_PM800 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K400_DID),
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.driver_data = UNICHROME_K400 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K800_DID),
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.driver_data = UNICHROME_K800 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_P4M890_DID),
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.driver_data = UNICHROME_CN700 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K8M890_DID),
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.driver_data = UNICHROME_K8M890 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CX700_DID),
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.driver_data = UNICHROME_CX700 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_P4M900_DID),
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.driver_data = UNICHROME_P4M900 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CN750_DID),
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.driver_data = UNICHROME_CN750 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_VX800_DID),
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.driver_data = UNICHROME_VX800 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_VX855_DID),
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.driver_data = UNICHROME_VX855 },
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{ }
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};
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MODULE_DEVICE_TABLE(pci, via_pci_table);
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static struct pci_driver via_driver = {
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.name = "viafb",
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.id_table = via_pci_table,
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.probe = via_pci_probe,
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.remove = __devexit_p(via_pci_remove),
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};
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static int __init via_core_init(void)
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{
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int ret;
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ret = viafb_init();
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if (ret)
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return ret;
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viafb_i2c_init();
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viafb_gpio_init();
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return pci_register_driver(&via_driver);
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}
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static void __exit via_core_exit(void)
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{
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pci_unregister_driver(&via_driver);
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viafb_gpio_exit();
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viafb_i2c_exit();
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viafb_exit();
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}
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module_init(via_core_init);
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module_exit(via_core_exit);
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