summaryrefslogtreecommitdiffstats
path: root/arch/mips/pci/fixup-cobalt.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/pci/fixup-cobalt.c')
-rw-r--r--arch/mips/pci/fixup-cobalt.c207
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 0000000000..00206ff529
--- /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, &lt);
+ 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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-12 15:21:03 +0000