diff options
Diffstat (limited to 'arch/mips/pci/fixup-cobalt.c')
| -rw-r--r-- | arch/mips/pci/fixup-cobalt.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/arch/mips/pci/fixup-cobalt.c b/arch/mips/pci/fixup-cobalt.c new file mode 100644 index 000000000..00206ff52 --- /dev/null +++ b/arch/mips/pci/fixup-cobalt.c @@ -0,0 +1,207 @@ +/* + * Cobalt Qube/Raq PCI support + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1995, 1996, 1997, 2002, 2003 by Ralf Baechle + * Copyright (C) 2001, 2002, 2003 by Liam Davies (ldavies@agile.tv) + */ +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/kernel.h> +#include <linux/init.h> + +#include <asm/io.h> +#include <asm/gt64120.h> + +#include <cobalt.h> +#include <irq.h> + +/* + * PCI slot numbers + */ +#define COBALT_PCICONF_CPU 0x06 +#define COBALT_PCICONF_ETH0 0x07 +#define COBALT_PCICONF_RAQSCSI 0x08 +#define COBALT_PCICONF_VIA 0x09 +#define COBALT_PCICONF_PCISLOT 0x0A +#define COBALT_PCICONF_ETH1 0x0C + +/* + * The Cobalt board ID information. The boards have an ID number wired + * into the VIA that is available in the high nibble of register 94. + */ +#define VIA_COBALT_BRD_ID_REG 0x94 +#define VIA_COBALT_BRD_REG_to_ID(reg) ((unsigned char)(reg) >> 4) + +/* + * Default value of PCI Class Code on GT64111 is PCI_CLASS_MEMORY_OTHER (0x0580) + * instead of PCI_CLASS_BRIDGE_HOST (0x0600). Galileo explained this choice in + * document "GT-64111 System Controller for RC4640, RM523X and VR4300 CPUs", + * section "6.5.3 PCI Autoconfiguration at RESET": + * + * Some PCs refuse to configure host bridges if they are found plugged into + * a PCI slot (ask the BIOS vendors why...). The "Memory Controller" Class + * Code does not cause a problem for these non-compliant BIOSes, so we used + * this as the default in the GT-64111. + * + * So fix the incorrect default value of PCI Class Code. More details are on: + * https://lore.kernel.org/r/20211102154831.xtrlgrmrizl5eidl@pali/ + * https://lore.kernel.org/r/20211102150201.GA11675@alpha.franken.de/ + */ +static void qube_raq_galileo_early_fixup(struct pci_dev *dev) +{ + if (dev->devfn == PCI_DEVFN(0, 0) && + (dev->class >> 8) == PCI_CLASS_MEMORY_OTHER) { + + dev->class = (PCI_CLASS_BRIDGE_HOST << 8) | (dev->class & 0xff); + + printk(KERN_INFO "Galileo: fixed bridge class\n"); + } +} + +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_GT64111, + qube_raq_galileo_early_fixup); + +static void qube_raq_via_bmIDE_fixup(struct pci_dev *dev) +{ + unsigned short cfgword; + unsigned char lt; + + /* Enable Bus Mastering and fast back to back. */ + pci_read_config_word(dev, PCI_COMMAND, &cfgword); + cfgword |= (PCI_COMMAND_FAST_BACK | PCI_COMMAND_MASTER); + pci_write_config_word(dev, PCI_COMMAND, cfgword); + + /* Enable both ide interfaces. ROM only enables primary one. */ + pci_write_config_byte(dev, 0x40, 0xb); + + /* Set latency timer to reasonable value. */ + pci_read_config_byte(dev, PCI_LATENCY_TIMER, <); + if (lt < 64) + pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64); + pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 8); +} + +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_1, + qube_raq_via_bmIDE_fixup); + +static void qube_raq_galileo_fixup(struct pci_dev *dev) +{ + if (dev->devfn != PCI_DEVFN(0, 0)) + return; + + /* Fix PCI latency-timer and cache-line-size values in Galileo + * host bridge. + */ + pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64); + pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 8); + + /* + * The code described by the comment below has been removed + * as it causes bus mastering by the Ethernet controllers + * to break under any kind of network load. We always set + * the retry timeouts to their maximum. + * + * --x--x--x--x--x--x--x--x--x--x--x--x--x--x--x--x--x--x--x--x-- + * + * On all machines prior to Q2, we had the STOP line disconnected + * from Galileo to VIA on PCI. The new Galileo does not function + * correctly unless we have it connected. + * + * Therefore we must set the disconnect/retry cycle values to + * something sensible when using the new Galileo. + */ + + printk(KERN_INFO "Galileo: revision %u\n", dev->revision); + +#if 0 + if (dev->revision >= 0x10) { + /* New Galileo, assumes PCI stop line to VIA is connected. */ + GT_WRITE(GT_PCI0_TOR_OFS, 0x4020); + } else if (dev->revision == 0x1 || dev->revision == 0x2) +#endif + { + signed int timeo; + /* XXX WE MUST DO THIS ELSE GALILEO LOCKS UP! -DaveM */ + timeo = GT_READ(GT_PCI0_TOR_OFS); + /* Old Galileo, assumes PCI STOP line to VIA is disconnected. */ + GT_WRITE(GT_PCI0_TOR_OFS, + (0xff << 16) | /* retry count */ + (0xff << 8) | /* timeout 1 */ + 0xff); /* timeout 0 */ + + /* enable PCI retry exceeded interrupt */ + GT_WRITE(GT_INTRMASK_OFS, GT_INTR_RETRYCTR0_MSK | GT_READ(GT_INTRMASK_OFS)); + } +} + +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_GT64111, + qube_raq_galileo_fixup); + +int cobalt_board_id; + +static void qube_raq_via_board_id_fixup(struct pci_dev *dev) +{ + u8 id; + int retval; + + retval = pci_read_config_byte(dev, VIA_COBALT_BRD_ID_REG, &id); + if (retval) { + panic("Cannot read board ID"); + return; + } + + cobalt_board_id = VIA_COBALT_BRD_REG_to_ID(id); + + printk(KERN_INFO "Cobalt board ID: %d\n", cobalt_board_id); +} + +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_0, + qube_raq_via_board_id_fixup); + +static char irq_tab_qube1[] = { + [COBALT_PCICONF_CPU] = 0, + [COBALT_PCICONF_ETH0] = QUBE1_ETH0_IRQ, + [COBALT_PCICONF_RAQSCSI] = SCSI_IRQ, + [COBALT_PCICONF_VIA] = 0, + [COBALT_PCICONF_PCISLOT] = PCISLOT_IRQ, + [COBALT_PCICONF_ETH1] = 0 +}; + +static char irq_tab_cobalt[] = { + [COBALT_PCICONF_CPU] = 0, + [COBALT_PCICONF_ETH0] = ETH0_IRQ, + [COBALT_PCICONF_RAQSCSI] = SCSI_IRQ, + [COBALT_PCICONF_VIA] = 0, + [COBALT_PCICONF_PCISLOT] = PCISLOT_IRQ, + [COBALT_PCICONF_ETH1] = ETH1_IRQ +}; + +static char irq_tab_raq2[] = { + [COBALT_PCICONF_CPU] = 0, + [COBALT_PCICONF_ETH0] = ETH0_IRQ, + [COBALT_PCICONF_RAQSCSI] = RAQ2_SCSI_IRQ, + [COBALT_PCICONF_VIA] = 0, + [COBALT_PCICONF_PCISLOT] = PCISLOT_IRQ, + [COBALT_PCICONF_ETH1] = ETH1_IRQ +}; + +int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) +{ + if (cobalt_board_id <= COBALT_BRD_ID_QUBE1) + return irq_tab_qube1[slot]; + + if (cobalt_board_id == COBALT_BRD_ID_RAQ2) + return irq_tab_raq2[slot]; + + return irq_tab_cobalt[slot]; +} + +/* Do platform specific device initialization at pci_enable_device() time */ +int pcibios_plat_dev_init(struct pci_dev *dev) +{ + return 0; +} |