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authorBjorn Helgaas <bhelgaas@google.com>2017-02-22 00:15:49 +0300
committerBjorn Helgaas <bhelgaas@google.com>2017-02-22 00:15:49 +0300
commitb98a7f7509ed7a031ed750be11b72b7ca1c95513 (patch)
tree96f6b20d68eff2e5a979af1f6df3a2e27d868ee7 /drivers/pci
parentbcea623c65d5ad3b2f4e51908cffc9423175a10b (diff)
parentc5c4d3a3f4a8c830cb514eb469a1025df2df0379 (diff)
downloadlinux-b98a7f7509ed7a031ed750be11b72b7ca1c95513.tar.xz
Merge branch 'pci/host-thunder' into next
* pci/host-thunder: PCI: thunder-pem: Add support for cn81xx and cn83xx SoCs
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/host/pci-thunder-pem.c25
1 files changed, 20 insertions, 5 deletions
diff --git a/drivers/pci/host/pci-thunder-pem.c b/drivers/pci/host/pci-thunder-pem.c
index af722eb0ca75..52b5bdccf5f0 100644
--- a/drivers/pci/host/pci-thunder-pem.c
+++ b/drivers/pci/host/pci-thunder-pem.c
@@ -36,7 +36,7 @@ struct thunder_pem_pci {
static int thunder_pem_bridge_read(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *val)
{
- u64 read_val;
+ u64 read_val, tmp_val;
struct pci_config_window *cfg = bus->sysdata;
struct thunder_pem_pci *pem_pci = (struct thunder_pem_pci *)cfg->priv;
@@ -65,13 +65,28 @@ static int thunder_pem_bridge_read(struct pci_bus *bus, unsigned int devfn,
read_val |= 0x00007000; /* Skip MSI CAP */
break;
case 0x70: /* Express Cap */
- /* PME interrupt on vector 2*/
- read_val |= (2u << 25);
+ /*
+ * Change PME interrupt to vector 2 on T88 where it
+ * reads as 0, else leave it alone.
+ */
+ if (!(read_val & (0x1f << 25)))
+ read_val |= (2u << 25);
break;
case 0xb0: /* MSI-X Cap */
- /* TableSize=4, Next Cap is EA */
+ /* TableSize=2 or 4, Next Cap is EA */
read_val &= 0xc00000ff;
- read_val |= 0x0003bc00;
+ /*
+ * If Express Cap(0x70) raw PME vector reads as 0 we are on
+ * T88 and TableSize is reported as 4, else TableSize
+ * is 2.
+ */
+ writeq(0x70, pem_pci->pem_reg_base + PEM_CFG_RD);
+ tmp_val = readq(pem_pci->pem_reg_base + PEM_CFG_RD);
+ tmp_val >>= 32;
+ if (!(tmp_val & (0x1f << 25)))
+ read_val |= 0x0003bc00;
+ else
+ read_val |= 0x0001bc00;
break;
case 0xb4:
/* Table offset=0, BIR=0 */