sh: Hook up ERR/PERR/SERR detection for SH7780 PCI host controllers.

These were never handled before, so implement some common infrastructure
to support them, then make use of that in the SH7780-specific code. In
practice there is little here that can not be generalized for SH4 parts,
which will be an incremental change as the 7780/7751 code is gradually
unified.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 51 insertions, 0 deletions

diff --git a/arch/sh/drivers/pci/pci.c b/arch/sh/drivers/pci/pci.c
index 488331c45033..8e42dfbbe76a 100644
--- a/arch/sh/drivers/pci/pci.c
+++ b/arch/sh/drivers/pci/pci.c
@@ -79,6 +79,11 @@ int __devinit register_pci_controller(struct pci_channel *hose)
         }
 
         /*
+         * Setup the ERR/PERR and SERR timers, if available.
+         */
+        pcibios_enable_timers(hose);
+
+        /*
          * Scan the bus if it is register after the PCI subsystem
          * initialization.
          */
@@ -289,6 +294,52 @@ char * __devinit pcibios_setup(char *str)
         return str;
 }
 
+/*
+ * We can't use pci_find_device() here since we are
+ * called from interrupt context.
+ */
+static void pcibios_bus_report_status(struct pci_bus *bus,
+                unsigned int status_mask, int warn)
+{
+        struct pci_dev *dev;
+
+        list_for_each_entry(dev, &bus->devices, bus_list) {
+                u16 status;
+
+                /*
+                 * ignore host bridge - we handle
+                 * that separately
+                 */
+                if (dev->bus->number == 0 && dev->devfn == 0)
+                        continue;
+
+                pci_read_config_word(dev, PCI_STATUS, &status);
+                if (status == 0xffff)
+                        continue;
+
+                if ((status & status_mask) == 0)
+                        continue;
+
+                /* clear the status errors */
+                pci_write_config_word(dev, PCI_STATUS, status & status_mask);
+
+                if (warn)
+                        printk("(%s: %04X) ", pci_name(dev), status);
+        }
+
+        list_for_each_entry(dev, &bus->devices, bus_list)
+                if (dev->subordinate)
+                        pcibios_bus_report_status(dev->subordinate, status_mask, warn);
+}
+
+void pcibios_report_status(unsigned int status_mask, int warn)
+{
+        struct pci_channel *hose;
+
+        for (hose = hose_head; hose; hose = hose->next)
+                pcibios_bus_report_status(hose->bus, status_mask, warn);
+}
+
 int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
                         enum pci_mmap_state mmap_state, int write_combine)
 {