/* * This file is part of the coreboot project. * * Copyright (C) 2008 Advanced Micro Devices, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ /* * for rs690 internal graphics device * device id of internal grphics: * RS690M/T: 0x791f * RS690: 0x791e */ #include #include #include #include #include #include #include "rs690.h" #define CLK_CNTL_INDEX 0x8 #define CLK_CNTL_DATA 0xC static u32 clkind_read(device_t dev, u32 index) { u32 gfx_bar2 = pci_read_config32(dev, 0x18) & ~0xF; *(u32*)(gfx_bar2+CLK_CNTL_INDEX) = index & 0x7F; return *(u32*)(gfx_bar2+CLK_CNTL_DATA); } static void clkind_write(device_t dev, u32 index, u32 data) { u32 gfx_bar2 = pci_read_config32(dev, 0x18) & ~0xF; /* printk_info("gfx bar 2 %02x\n", gfx_bar2); */ *(u32*)(gfx_bar2+CLK_CNTL_INDEX) = index | 1<<7; *(u32*)(gfx_bar2+CLK_CNTL_DATA) = data; } /* * pci_dev_read_resources thinks it is a IO type. * We have to force it to mem type. */ static void rs690_gfx_read_resources(device_t dev) { printk_info("rs690_gfx_read_resources.\n"); /* The initial value of 0x24 is 0xFFFFFFFF, which is confusing. Even if we write 0xFFFFFFFF into it, it will be 0xFFF00000, which tells us it is a memory address base. */ pci_write_config32(dev, 0x24, 0x00000000); /* Get the normal pci resources of this device */ pci_dev_read_resources(dev); compact_resources(dev); } static void internal_gfx_pci_dev_init(struct device *dev) { u16 deviceid, vendorid; struct southbridge_amd_rs690_config *cfg = (struct southbridge_amd_rs690_config *)dev->chip_info; deviceid = pci_read_config16(dev, PCI_DEVICE_ID); vendorid = pci_read_config16(dev, PCI_VENDOR_ID); printk_info("internal_gfx_pci_dev_init device=%x, vendor=%x, vga_rom_address=0x%x.\n", deviceid, vendorid, cfg->vga_rom_address); #if 0 /* I think these should be done in Config.lb. Please check it. */ dev->on_mainboard = 1; dev->rom_address = cfg->vga_rom_address; /* 0xfff00000; */ #endif pci_dev_init(dev); /* clk ind */ clkind_write(dev, 0x08, 0x01); clkind_write(dev, 0x0C, 0x22); clkind_write(dev, 0x0F, 0x0); clkind_write(dev, 0x11, 0x0); clkind_write(dev, 0x12, 0x0); clkind_write(dev, 0x14, 0x0); clkind_write(dev, 0x15, 0x0); clkind_write(dev, 0x16, 0x0); clkind_write(dev, 0x17, 0x0); clkind_write(dev, 0x18, 0x0); clkind_write(dev, 0x19, 0x0); clkind_write(dev, 0x1A, 0x0); clkind_write(dev, 0x1B, 0x0); clkind_write(dev, 0x1C, 0x0); clkind_write(dev, 0x1D, 0x0); clkind_write(dev, 0x1E, 0x0); clkind_write(dev, 0x26, 0x0); clkind_write(dev, 0x27, 0x0); clkind_write(dev, 0x28, 0x0); clkind_write(dev, 0x5C, 0x0); } /* * Set registers in RS690 and CPU to enable the internal GFX. * Please refer to CIM source code and BKDG. */ static void rs690_internal_gfx_enable(device_t dev) { u32 l_dword; int i; device_t k8_f0 = 0, k8_f2 = 0; device_t nb_dev = dev_find_slot(0, 0); printk_info("rs690_internal_gfx_enable dev=0x%p, nb_dev=0x%p.\n", dev, nb_dev); /* set APERTURE_SIZE, 128M. */ l_dword = pci_read_config32(nb_dev, 0x8c); printk_info("nb_dev, 0x8c=0x%x\n", l_dword); l_dword &= 0xffffff8f; pci_write_config32(nb_dev, 0x8c, l_dword); /* set TOM */ rs690_set_tom(nb_dev); /* LPC DMA Deadlock workaround? */ k8_f0 = dev_find_slot(0, PCI_DEVFN(0x18, 0)); l_dword = pci_read_config32(k8_f0, 0x68); l_dword &= ~(1 << 22); l_dword |= (1 << 21); pci_write_config32(k8_f0, 0x68, l_dword); /* Enable 64bit mode. */ set_nbmc_enable_bits(nb_dev, 0x5f, 0, 1 << 9); set_nbmc_enable_bits(nb_dev, 0xb0, 0, 1 << 8); /* 64bit Latency. */ set_nbmc_enable_bits(nb_dev, 0x5f, 0x7c00, 0x800); /* UMA dual channel control register. */ nbmc_write_index(nb_dev, 0x86, 0x3d); /* check the setting later!! */ set_htiu_enable_bits(nb_dev, 0x07, 1 << 7, 0); /* UMA mode, powerdown memory PLL. */ set_nbmc_enable_bits(nb_dev, 0x74, 0, 1 << 31); /* Copy CPU DDR Controller to NB MC. */ /* Why K8_MC_REG80 is special? */ k8_f2 = dev_find_slot(0, PCI_DEVFN(0x18, 2)); for (i = 0; i <= (0x80 - 0x40) / 4; i++) { l_dword = pci_read_config32(k8_f2, 0x40 + i * 4); nbmc_write_index(nb_dev, 0x63 + i, l_dword); } /* Set K8 MC for UMA, Family F. */ l_dword = pci_read_config32(k8_f2, 0xa0); l_dword |= 0x2c; pci_write_config32(k8_f2, 0xa0, l_dword); l_dword = pci_read_config32(k8_f2, 0x94); l_dword &= 0xf0ffffff; l_dword |= 0x07000000; pci_write_config32(k8_f2, 0x94, l_dword); /* set FB size and location. */ nbmc_write_index(nb_dev, 0x1b, 0x00); l_dword = nbmc_read_index(nb_dev, 0x1c); l_dword &= 0xffff0; l_dword |= 0x400 << 20; l_dword |= 0x4; nbmc_write_index(nb_dev, 0x1c, l_dword); l_dword = nbmc_read_index(nb_dev, 0x1d); l_dword &= 0xfffff000; l_dword |= 0x0400; nbmc_write_index(nb_dev, 0x1d, l_dword); nbmc_write_index(nb_dev, 0x100, 0x3fff3800); /* Program MC table. */ set_nbmc_enable_bits(nb_dev, 0x00, 0, 1 << 31); l_dword = nbmc_read_index(nb_dev, 0x91); l_dword |= 0x5; nbmc_write_index(nb_dev, 0x91, l_dword); set_nbmc_enable_bits(nb_dev, 0xb1, 0, 1 << 6); set_nbmc_enable_bits(nb_dev, 0xc3, 0, 1); /* TODO: the optimization of voltage and frequency */ } static struct pci_operations lops_pci = { .set_subsystem = pci_dev_set_subsystem, }; static struct device_operations pcie_ops = { .read_resources = rs690_gfx_read_resources, .set_resources = pci_dev_set_resources, .enable_resources = pci_dev_enable_resources, .init = internal_gfx_pci_dev_init, /* The option ROM initializes the device. rs690_gfx_init, */ .scan_bus = 0, .enable = rs690_internal_gfx_enable, .ops_pci = &lops_pci, }; /* * The dev id of 690G is 791E, while the id of 690M, 690T is 791F. * We should list both of them here. * */ static struct pci_driver pcie_driver_690t __pci_driver = { .ops = &pcie_ops, .vendor = PCI_VENDOR_ID_ATI, .device = PCI_DEVICE_ID_ATI_RS690MT_INT_GFX, }; static struct pci_driver pcie_driver_690 __pci_driver = { .ops = &pcie_ops, .vendor = PCI_VENDOR_ID_ATI, .device = PCI_DEVICE_ID_ATI_RS690_INT_GFX, }; /* step 12 ~ step 14 from rpr */ static void single_port_configuration(device_t nb_dev, device_t dev) { u8 result, width; u32 reg32; struct southbridge_amd_rs690_config *cfg = (struct southbridge_amd_rs690_config *)nb_dev->chip_info; printk_info("rs690_gfx_init single_port_configuration.\n"); /* step 12 training, releases hold training for GFX port 0 (device 2) */ set_nbmisc_enable_bits(nb_dev, 0x8, 1 << 4, 0<<4); PcieReleasePortTraining(nb_dev, dev, 2); result = PcieTrainPort(nb_dev, dev, 2); printk_info("rs690_gfx_init single_port_configuration step12.\n"); /* step 13 Power Down Control */ /* step 13.1 Enables powering down transmitter and receiver pads along with PLL macros. */ set_pcie_enable_bits(nb_dev, 0x40, 1 << 0, 1 << 0); /* step 13.a Link Training was NOT successful */ if (!result) { set_nbmisc_enable_bits(nb_dev, 0x8, 0, 0x3 << 4); /* prevent from training. */ set_nbmisc_enable_bits(nb_dev, 0xc, 0, 0x3 << 2); /* hide the GFX bridge. */ if (cfg->gfx_tmds) nbpcie_ind_write_index(nb_dev, 0x65, 0xccf0f0); else { nbpcie_ind_write_index(nb_dev, 0x65, 0xffffffff); set_nbmisc_enable_bits(nb_dev, 0x7, 1 << 3, 1 << 3); } } else { /* step 13.b Link Training was successful */ reg32 = nbpcie_p_read_index(dev, 0xa2); width = (reg32 >> 4) & 0x7; printk_debug("GFX LC_LINK_WIDTH = 0x%x.\n", width); switch (width) { case 1: case 2: nbpcie_ind_write_index(nb_dev, 0x65, cfg->gfx_lane_reversal ? 0x7f7f : 0xccfefe); break; case 4: nbpcie_ind_write_index(nb_dev, 0x65, cfg->gfx_lane_reversal ? 0x3f3f : 0xccfcfc); break; case 8: nbpcie_ind_write_index(nb_dev, 0x65, cfg->gfx_lane_reversal ? 0x0f0f : 0xccf0f0); break; } } printk_info("rs690_gfx_init single_port_configuration step13.\n"); /* step 14 Reset Enumeration Timer, disables the shortening of the enumeration timer */ set_pcie_enable_bits(dev, 0x70, 1 << 19, 0 << 19); printk_info("rs690_gfx_init single_port_configuration step14.\n"); } /* step 15 ~ step 18 from rpr */ static void dual_port_configuration(device_t nb_dev, device_t dev) { u8 result, width; u32 reg32; struct southbridge_amd_rs690_config *cfg = (struct southbridge_amd_rs690_config *)nb_dev->chip_info; /* step 15: Training for Device 2 */ set_nbmisc_enable_bits(nb_dev, 0x8, 1 << 4, 0 << 4); /* Releases hold training for GFX port 0 (device 2) */ PcieReleasePortTraining(nb_dev, dev, 2); /* PCIE Link Training Sequence */ result = PcieTrainPort(nb_dev, dev, 2); /* step 16: Power Down Control for Device 2 */ /* step 16.a Link Training was NOT successful */ if (!result) { /* Powers down all lanes for port A */ nbpcie_ind_write_index(nb_dev, 0x65, 0x0f0f); } else { /* step 16.b Link Training was successful */ reg32 = nbpcie_p_read_index(dev, 0xa2); width = (reg32 >> 4) & 0x7; printk_debug("GFX LC_LINK_WIDTH = 0x%x.\n", width); switch (width) { case 1: case 2: nbpcie_ind_write_index(nb_dev, 0x65, cfg->gfx_lane_reversal ? 0x0707 : 0x0e0e); break; case 4: nbpcie_ind_write_index(nb_dev, 0x65, cfg->gfx_lane_reversal ? 0x0303 : 0x0c0c); break; } } /* step 17: Training for Device 3 */ set_nbmisc_enable_bits(nb_dev, 0x8, 1 << 5, 0 << 5); /* Releases hold training for GFX port 0 (device 3) */ PcieReleasePortTraining(nb_dev, dev, 3); /* PCIE Link Training Sequence */ result = PcieTrainPort(nb_dev, dev, 3); /*step 18: Power Down Control for Device 3 */ /* step 18.a Link Training was NOT successful */ if (!result) { /* Powers down all lanes for port B and PLL1 */ nbpcie_ind_write_index(nb_dev, 0x65, 0xccf0f0); } else { /* step 18.b Link Training was successful */ reg32 = nbpcie_p_read_index(dev, 0xa2); width = (reg32 >> 4) & 0x7; printk_debug("GFX LC_LINK_WIDTH = 0x%x.\n", width); switch (width) { case 1: case 2: nbpcie_ind_write_index(nb_dev, 0x65, cfg->gfx_lane_reversal ? 0x7070 : 0xe0e0); break; case 4: nbpcie_ind_write_index(nb_dev, 0x65, cfg->gfx_lane_reversal ? 0x3030 : 0xc0c0); break; } } } /* For single port GFX configuration Only * width: * 000 = x16 * 001 = x1 * 010 = x2 * 011 = x4 * 100 = x8 * 101 = x12 (not supported) * 110 = x16 */ static void dynamic_link_width_control(device_t nb_dev, device_t dev, u8 width) { u32 reg32; device_t sb_dev; struct southbridge_amd_rs690_config *cfg = (struct southbridge_amd_rs690_config *)nb_dev->chip_info; /* step 5.9.1.1 */ reg32 = nbpcie_p_read_index(dev, 0xa2); /* step 5.9.1.2 */ set_pcie_enable_bits(nb_dev, 0x40, 1 << 0, 1 << 0); /* step 5.9.1.3 */ set_pcie_enable_bits(dev, 0xa2, 3 << 0, width << 0); /* step 5.9.1.4 */ set_pcie_enable_bits(dev, 0xa2, 1 << 8, 1 << 8); /* step 5.9.2.4 */ if (0 == cfg->gfx_reconfiguration) set_pcie_enable_bits(dev, 0xa2, 1 << 11, 1 << 11); /* step 5.9.1.5 */ do { reg32 = nbpcie_p_read_index(dev, 0xa2); } while (reg32 & 0x100); /* step 5.9.1.6 */ sb_dev = dev_find_slot(0, PCI_DEVFN(8, 0)); do { reg32 = pci_ext_read_config32(nb_dev, sb_dev, PCIE_VC0_RESOURCE_STATUS); } while (reg32 & VC_NEGOTIATION_PENDING); /* step 5.9.1.7 */ reg32 = nbpcie_p_read_index(dev, 0xa2); if (((reg32 & 0x70) >> 4) != 0x6) { /* the unused lanes should be powered off. */ } /* step 5.9.1.8 */ set_pcie_enable_bits(nb_dev, 0x40, 1 << 0, 0 << 0); } /* * GFX Core initialization, dev2, dev3 */ void rs690_gfx_init(device_t nb_dev, device_t dev, u32 port) { u16 reg16; struct southbridge_amd_rs690_config *cfg = (struct southbridge_amd_rs690_config *)nb_dev->chip_info; printk_info("rs690_gfx_init, nb_dev=0x%p, dev=0x%p, port=0x%x.\n", nb_dev, dev, port); /* step 0, REFCLK_SEL, skip A11 revision */ set_nbmisc_enable_bits(nb_dev, 0x6a, 1 << 9, cfg->gfx_dev2_dev3 ? 1 << 9 : 0 << 9); printk_info("rs690_gfx_init step0.\n"); /* step 1, lane reversal (only need if CMOS option is enabled) */ if (cfg->gfx_lane_reversal) { set_nbmisc_enable_bits(nb_dev, 0x33, 1 << 2, 1 << 2); if (cfg->gfx_dual_slot) set_nbmisc_enable_bits(nb_dev, 0x33, 1 << 3, 1 << 3); } printk_info("rs690_gfx_init step1.\n"); /* step 1.1, dual-slot gfx configuration (only need if CMOS option is enabled) */ /* AMD calls the configuration CrossFire */ if (cfg->gfx_dual_slot) set_nbmisc_enable_bits(nb_dev, 0x0, 0xf << 8, 5 << 8); printk_info("rs690_gfx_init step2.\n"); /* step 2, TMDS, (only need if CMOS option is enabled) */ if (cfg->gfx_tmds) { } /* step 3, GFX overclocking, (only need if CMOS option is enabled) */ /* skip */ /* step 4, reset the GFX link */ /* step 4.1 asserts both calibration reset and global reset */ set_nbmisc_enable_bits(nb_dev, 0x8, 0x3 << 14, 0x3 << 14); /* step 4.2 de-asserts calibration reset */ set_nbmisc_enable_bits(nb_dev, 0x8, 1 << 14, 0 << 14); /* step 4.3 wait for at least 200us */ udelay(200); /* step 4.4 de-asserts global reset */ set_nbmisc_enable_bits(nb_dev, 0x8, 1 << 15, 0 << 15); /* step 4.5 asserts both calibration reset and global reset */ /* a weird step in RPR, don't do that */ /* set_nbmisc_enable_bits(nb_dev, 0x8, 0x3 << 14, 0x3 << 14); */ /* step 4.6 bring external GFX device out of reset, wait for 1ms */ mdelay(1); printk_info("rs690_gfx_init step4.\n"); /* step 5 program PCIE memory mapped configuration space */ /* done by enable_pci_bar3() before */ /* step 6 SBIOS compile flags */ if (cfg->gfx_tmds) { /* step 6.2.2 Clock-Muxing Control */ /* step 6.2.2.1 */ set_nbmisc_enable_bits(nb_dev, 0x7, 1 << 16, 1 << 16); /* step 6.2.2.2 */ set_nbmisc_enable_bits(nb_dev, 0x7, 1 << 8, 1 << 8); set_nbmisc_enable_bits(nb_dev, 0x7, 1 << 10, 1 << 10); /* step 6.2.2.3 */ set_nbmisc_enable_bits(nb_dev, 0x7, 1 << 26, 1 << 26); /* step 6.2.3 Lane-Muxing Control */ /* step 6.2.3.1 */ set_nbmisc_enable_bits(nb_dev, 0x37, 0x3 << 8, 0x2 << 8); /* step 6.2.4 Received Data Control */ /* step 6.2.4.1 */ set_pcie_enable_bits(nb_dev, 0x40, 0x3 << 16, 0x2 << 16); /* step 6.2.4.2 */ set_pcie_enable_bits(nb_dev, 0x40, 0x3 << 18, 0x3 << 18); /* step 6.2.4.3 */ set_pcie_enable_bits(nb_dev, 0x40, 0x3 << 20, 0x0 << 20); /* step 6.2.4.4 */ set_pcie_enable_bits(nb_dev, 0x40, 0x3 << 22, 0x1 << 22); /* step 6.2.5 PLL Power Down Control */ /* step 6.2.5.1 */ set_nbmisc_enable_bits(nb_dev, 0x35, 0x3 << 6, 0x0 << 6); /* step 6.2.6 Driving Strength Control */ /* step 6.2.6.1 */ set_nbmisc_enable_bits(nb_dev, 0x34, 0x1 << 24, 0x0 << 24); /* step 6.2.6.2 */ set_nbmisc_enable_bits(nb_dev, 0x35, 0x3 << 2, 0x3 << 2); } printk_info("rs690_gfx_init step6.\n"); /* step 7 compliance state, (only need if CMOS option is enabled) */ /* the compliance stete is just for test. refer to 4.2.5.2 of PCIe specification */ if (cfg->gfx_compliance) { /* force compliance */ set_nbmisc_enable_bits(nb_dev, 0x32, 1 << 6, 1 << 6); /* release hold training for device 2. GFX initialization is done. */ set_nbmisc_enable_bits(nb_dev, 0x8, 1 << 4, 0 << 4); dynamic_link_width_control(nb_dev, dev, cfg->gfx_link_width); printk_info("rs690_gfx_init step7.\n"); return; } /* step 8 common initialization */ /* step 8.1 sets RCB timeout to be 25ms */ set_pcie_enable_bits(dev, 0x70, 7 << 16, 3 << 16); printk_info("rs690_gfx_init step8.1.\n"); /* step 8.2 disables slave ordering logic */ set_pcie_enable_bits(nb_dev, 0x20, 1 << 8, 1 << 8); printk_info("rs690_gfx_init step8.2.\n"); /* step 8.3 sets DMA payload size to 64 bytes */ set_pcie_enable_bits(nb_dev, 0x10, 7 << 10, 4 << 10); printk_info("rs690_gfx_init step8.3.\n"); /* step 8.4 if the LTSSM could not see all 8 TS1 during Polling Active, it can still * time out and go back to Detect Idle.*/ set_pcie_enable_bits(dev, 0x02, 1 << 14, 1 << 14); printk_info("rs690_gfx_init step8.4.\n"); /* step 8.5 shortens the enumeration timer */ set_pcie_enable_bits(dev, 0x70, 1 << 19, 1 << 19); printk_info("rs690_gfx_init step8.5.\n"); /* step 8.6 blocks DMA traffic during C3 state */ set_pcie_enable_bits(dev, 0x10, 1 << 0, 0 << 0); printk_info("rs690_gfx_init step8.6.\n"); /* step 8.7 Do not gate the electrical idle form the PHY * step 8.8 Enables the escape from L1L23 */ set_pcie_enable_bits(dev, 0xa0, 3 << 30, 3 << 30); printk_info("rs690_gfx_init step8.8.\n"); /* step 8.9 Setting this register to 0x1 will workaround a PCI Compliance failure reported by Vista DTM. * SLOT_IMPLEMENTED@PCIE_CAP */ reg16 = pci_read_config16(dev, 0x5a); reg16 |= 0x100; pci_write_config16(dev, 0x5a, reg16); printk_info("rs690_gfx_init step8.9.\n"); /* step 8.10 Setting this register to 0x1 will hide the Advanced Error Rporting Capabilities in the PCIE Brider. * This will workaround several failures reported by the PCI Compliance test under Vista DTM. */ set_nbmisc_enable_bits(nb_dev, 0x33, 1 << 31, 0 << 31); printk_info("rs690_gfx_init step8.10.\n"); /* step 8.11 Sets REGS_DLP_IGNORE_IN_L1_EN to ignore DLLPs during L1 so that txclk can be turned off. */ set_pcie_enable_bits(nb_dev, 0x02, 1 << 0, 1 << 0); printk_info("rs690_gfx_init step8.11.\n"); /* step 8.12 Sets REGS_LC_DONT_GO_TO_L0S_IF_L1_ARMED to prevent lc to go to from L0 to Rcv_L0s if L1 is armed. */ set_pcie_enable_bits(nb_dev, 0x02, 1 << 6, 1 << 6); printk_info("rs690_gfx_init step8.12.\n"); /* step 8.13 Sets CMGOOD_OVERRIDE. */ set_nbmisc_enable_bits(nb_dev, 0x6a, 1 << 17, 1 << 17); printk_info("rs690_gfx_init step8.13.\n"); /* step 9 Enable TLP Flushing, for non-AMD GFX devices and Hot-Plug devices only. */ /* skip */ /* step 10 Optional Features, only needed if CMOS option is enabled. */ /* step 10.a: L0s */ /* enabling L0s in the RS690 GFX port(s) */ set_pcie_enable_bits(nb_dev, 0xF9, 3 << 13, 2 << 13); set_pcie_enable_bits(dev, 0xA0, 0xf << 8, 8 << 8); reg16 = pci_read_config16(dev, 0x68); reg16 |= 1 << 0; /* L0s is intended as a power saving state */ /* pci_write_config16(dev, 0x68, reg16); */ /* enabling L0s in the External GFX Device(s) */ /* step 10.b: active state power management (ASPM L1) */ /* TO DO */ /* step 10.c: turning off PLL During L1/L23 */ set_pcie_enable_bits(nb_dev, 0x40, 1 << 3, 1 << 3); set_pcie_enable_bits(nb_dev, 0x40, 1 << 9, 1 << 9); /* step 10.d: TXCLK clock gating */ set_nbmisc_enable_bits(nb_dev, 0x7, 3, 3); set_nbmisc_enable_bits(nb_dev, 0x7, 1 << 22, 1 << 22); set_pcie_enable_bits(nb_dev, 0x11, 0xf << 4, 0xc << 4); /* step 10.e: LCLK clock gating, done in rs690_config_misc_clk() */ /* step 11 Poll GPIO to determine whether it is single-port or dual-port configuration. * While details will be added later in the document, for now assue the single-port configuration. */ /* skip */ /* Single-port/Dual-port configureation. */ switch (cfg->gfx_dual_slot) { case 0: single_port_configuration(nb_dev, dev); break; case 1: dual_port_configuration(nb_dev, dev); break; default: printk_info("Incorrect configuration of external gfx slot.\n"); break; } }