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Diffstat (limited to 'arch/powerpc/platforms/85xx/mpc85xx_cds.c')
-rw-r--r--arch/powerpc/platforms/85xx/mpc85xx_cds.c125
1 files changed, 107 insertions, 18 deletions
diff --git a/arch/powerpc/platforms/85xx/mpc85xx_cds.c b/arch/powerpc/platforms/85xx/mpc85xx_cds.c
index 50c8d645836..6a171e9abf7 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx_cds.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_cds.c
@@ -24,6 +24,7 @@
#include <linux/seq_file.h>
#include <linux/initrd.h>
#include <linux/module.h>
+#include <linux/interrupt.h>
#include <linux/fsl_devices.h>
#include <asm/system.h>
@@ -45,6 +46,7 @@
#include <asm/i8259.h>
#include <sysdev/fsl_soc.h>
+#include <sysdev/fsl_pci.h>
#include "mpc85xx.h"
static int cds_pci_slot = 2;
@@ -58,8 +60,6 @@ static volatile u8 *cadmus;
static int mpc85xx_exclude_device(struct pci_controller *hose,
u_char bus, u_char devfn)
{
- if ((bus == hose->first_busno) && PCI_SLOT(devfn) == 0)
- return PCIBIOS_DEVICE_NOT_FOUND;
/* We explicitly do not go past the Tundra 320 Bridge */
if ((bus == 1) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
return PCIBIOS_DEVICE_NOT_FOUND;
@@ -69,6 +69,37 @@ static int mpc85xx_exclude_device(struct pci_controller *hose,
return PCIBIOS_SUCCESSFUL;
}
+static void mpc85xx_cds_restart(char *cmd)
+{
+ struct pci_dev *dev;
+ u_char tmp;
+
+ if ((dev = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686,
+ NULL))) {
+
+ /* Use the VIA Super Southbridge to force a PCI reset */
+ pci_read_config_byte(dev, 0x47, &tmp);
+ pci_write_config_byte(dev, 0x47, tmp | 1);
+
+ /* Flush the outbound PCI write queues */
+ pci_read_config_byte(dev, 0x47, &tmp);
+
+ /*
+ * At this point, the harware reset should have triggered.
+ * However, if it doesn't work for some mysterious reason,
+ * just fall through to the default reset below.
+ */
+
+ pci_dev_put(dev);
+ }
+
+ /*
+ * If we can't find the VIA chip (maybe the P2P bridge is disabled)
+ * or the VIA chip reset didn't work, just use the default reset.
+ */
+ mpc85xx_restart(NULL);
+}
+
static void __init mpc85xx_cds_pci_irq_fixup(struct pci_dev *dev)
{
u_char c;
@@ -98,7 +129,7 @@ static void __init mpc85xx_cds_pci_irq_fixup(struct pci_dev *dev)
/* There are two USB controllers.
* Identify them by functon number
*/
- if (PCI_FUNC(dev->devfn))
+ if (PCI_FUNC(dev->devfn) == 3)
dev->irq = 11;
else
dev->irq = 10;
@@ -109,17 +140,41 @@ static void __init mpc85xx_cds_pci_irq_fixup(struct pci_dev *dev)
}
}
+static void __devinit skip_fake_bridge(struct pci_dev *dev)
+{
+ /* Make it an error to skip the fake bridge
+ * in pci_setup_device() in probe.c */
+ dev->hdr_type = 0x7f;
+}
+DECLARE_PCI_FIXUP_EARLY(0x1957, 0x3fff, skip_fake_bridge);
+DECLARE_PCI_FIXUP_EARLY(0x3fff, 0x1957, skip_fake_bridge);
+DECLARE_PCI_FIXUP_EARLY(0xff3f, 0x5719, skip_fake_bridge);
+
#ifdef CONFIG_PPC_I8259
-#warning The i8259 PIC support is currently broken
-static void mpc85xx_8259_cascade(unsigned int irq, struct irq_desc *desc)
+static void mpc85xx_8259_cascade_handler(unsigned int irq,
+ struct irq_desc *desc)
{
unsigned int cascade_irq = i8259_irq();
if (cascade_irq != NO_IRQ)
+ /* handle an interrupt from the 8259 */
generic_handle_irq(cascade_irq);
- desc->chip->eoi(irq);
+ /* check for any interrupts from the shared IRQ line */
+ handle_fasteoi_irq(irq, desc);
+}
+
+static irqreturn_t mpc85xx_8259_cascade_action(int irq, void *dev_id)
+{
+ return IRQ_HANDLED;
}
+
+static struct irqaction mpc85xxcds_8259_irqaction = {
+ .handler = mpc85xx_8259_cascade_action,
+ .flags = IRQF_SHARED,
+ .mask = CPU_MASK_NONE,
+ .name = "8259 cascade",
+};
#endif /* PPC_I8259 */
#endif /* CONFIG_PCI */
@@ -128,10 +183,6 @@ static void __init mpc85xx_cds_pic_init(void)
struct mpic *mpic;
struct resource r;
struct device_node *np = NULL;
-#ifdef CONFIG_PPC_I8259
- struct device_node *cascade_node = NULL;
- int cascade_irq;
-#endif
np = of_find_node_by_type(np, "open-pic");
@@ -155,8 +206,19 @@ static void __init mpc85xx_cds_pic_init(void)
of_node_put(np);
mpic_init(mpic);
+}
+
+#if defined(CONFIG_PPC_I8259) && defined(CONFIG_PCI)
+static int mpc85xx_cds_8259_attach(void)
+{
+ int ret;
+ struct device_node *np = NULL;
+ struct device_node *cascade_node = NULL;
+ int cascade_irq;
+
+ if (!machine_is(mpc85xx_cds))
+ return 0;
-#ifdef CONFIG_PPC_I8259
/* Initialize the i8259 controller */
for_each_node_by_type(np, "interrupt-controller")
if (of_device_is_compatible(np, "chrp,iic")) {
@@ -166,22 +228,39 @@ static void __init mpc85xx_cds_pic_init(void)
if (cascade_node == NULL) {
printk(KERN_DEBUG "Could not find i8259 PIC\n");
- return;
+ return -ENODEV;
}
cascade_irq = irq_of_parse_and_map(cascade_node, 0);
if (cascade_irq == NO_IRQ) {
printk(KERN_ERR "Failed to map cascade interrupt\n");
- return;
+ return -ENXIO;
}
i8259_init(cascade_node, 0);
of_node_put(cascade_node);
- set_irq_chained_handler(cascade_irq, mpc85xx_8259_cascade);
-#endif /* CONFIG_PPC_I8259 */
+ /*
+ * Hook the interrupt to make sure desc->action is never NULL.
+ * This is required to ensure that the interrupt does not get
+ * disabled when the last user of the shared IRQ line frees their
+ * interrupt.
+ */
+ if ((ret = setup_irq(cascade_irq, &mpc85xxcds_8259_irqaction))) {
+ printk(KERN_ERR "Failed to setup cascade interrupt\n");
+ return ret;
+ }
+
+ /* Success. Connect our low-level cascade handler. */
+ set_irq_handler(cascade_irq, mpc85xx_8259_cascade_handler);
+
+ return 0;
}
+device_initcall(mpc85xx_cds_8259_attach);
+
+#endif /* CONFIG_PPC_I8259 */
+
/*
* Setup the architecture
*/
@@ -218,9 +297,14 @@ static void __init mpc85xx_cds_setup_arch(void)
}
#ifdef CONFIG_PCI
- for (np = NULL; (np = of_find_node_by_type(np, "pci")) != NULL;)
- mpc85xx_add_bridge(np);
-
+ for (np = NULL; (np = of_find_node_by_type(np, "pci")) != NULL;) {
+ struct resource rsrc;
+ of_address_to_resource(np, 0, &rsrc);
+ if ((rsrc.start & 0xfffff) == 0x8000)
+ fsl_add_bridge(np, 1);
+ else
+ fsl_add_bridge(np, 0);
+ }
ppc_md.pci_irq_fixup = mpc85xx_cds_pci_irq_fixup;
ppc_md.pci_exclude_device = mpc85xx_exclude_device;
#endif
@@ -265,7 +349,12 @@ define_machine(mpc85xx_cds) {
.init_IRQ = mpc85xx_cds_pic_init,
.show_cpuinfo = mpc85xx_cds_show_cpuinfo,
.get_irq = mpic_get_irq,
+#ifdef CONFIG_PCI
+ .restart = mpc85xx_cds_restart,
+#else
.restart = mpc85xx_restart,
+#endif
.calibrate_decr = generic_calibrate_decr,
.progress = udbg_progress,
+ .pcibios_fixup_bus = fsl_pcibios_fixup_bus,
};
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-14 13:52:33 +0000