PCI: altera: Check TLP completion status

[people/ms/linux.git] / drivers / pci / host / pcie-altera.c

diff --git a/drivers/pci/host/pcie-altera.c b/drivers/pci/host/pcie-altera.c
index e5dda38bdde5e1735a50b4de9fcd2cd6307d13c5..072255d5b31cb68be87c256ce5b9065cb6eb1155 100644 (file)
--- a/drivers/pci/host/pcie-altera.c
+++ b/drivers/pci/host/pcie-altera.c
@@ -55,8 +55,10 @@
 #define TLP_CFG_DW2(bus, devfn, offset)        \
                                (((bus) << 24) | ((devfn) << 16) | (offset))
 #define TLP_REQ_ID(bus, devfn)         (((bus) << 8) | (devfn))
+#define TLP_COMP_STATUS(s)             (((s) >> 12) & 7)
 #define TLP_HDR_SIZE                   3
 #define TLP_LOOP                       500
+#define RP_DEVFN                       0
 
 #define INTX_NUM                       4
 
@@ -166,34 +168,41 @@ static bool altera_pcie_valid_config(struct altera_pcie *pcie,
 
 static int tlp_read_packet(struct altera_pcie *pcie, u32 *value)
 {
-       u8 loop;
+       int i;
        bool sop = 0;
        u32 ctrl;
        u32 reg0, reg1;
+       u32 comp_status = 1;
 
        /*
         * Minimum 2 loops to read TLP headers and 1 loop to read data
         * payload.
         */
-       for (loop = 0; loop < TLP_LOOP; loop++) {
+       for (i = 0; i < TLP_LOOP; i++) {
                ctrl = cra_readl(pcie, RP_RXCPL_STATUS);
                if ((ctrl & RP_RXCPL_SOP) || (ctrl & RP_RXCPL_EOP) || sop) {
                        reg0 = cra_readl(pcie, RP_RXCPL_REG0);
                        reg1 = cra_readl(pcie, RP_RXCPL_REG1);
 
-                       if (ctrl & RP_RXCPL_SOP)
+                       if (ctrl & RP_RXCPL_SOP) {
                                sop = true;
+                               comp_status = TLP_COMP_STATUS(reg1);
+                       }
 
                        if (ctrl & RP_RXCPL_EOP) {
+                               if (comp_status)
+                                       return PCIBIOS_DEVICE_NOT_FOUND;
+
                                if (value)
                                        *value = reg0;
+
                                return PCIBIOS_SUCCESSFUL;
                        }
                }
                udelay(5);
        }
 
-       return -ENOENT;
+       return PCIBIOS_DEVICE_NOT_FOUND;
 }
 
 static void tlp_write_packet(struct altera_pcie *pcie, u32 *headers,
@@ -233,7 +242,7 @@ static int tlp_cfg_dword_read(struct altera_pcie *pcie, u8 bus, u32 devfn,
        else
                headers[0] = TLP_CFG_DW0(TLP_FMTTYPE_CFGRD1);
 
-       headers[1] = TLP_CFG_DW1(TLP_REQ_ID(pcie->root_bus_nr, devfn),
+       headers[1] = TLP_CFG_DW1(TLP_REQ_ID(pcie->root_bus_nr, RP_DEVFN),
                                        TLP_READ_TAG, byte_en);
        headers[2] = TLP_CFG_DW2(bus, devfn, where);
 
@@ -253,7 +262,7 @@ static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn,
        else
                headers[0] = TLP_CFG_DW0(TLP_FMTTYPE_CFGWR1);
 
-       headers[1] = TLP_CFG_DW1(TLP_REQ_ID(pcie->root_bus_nr, devfn),
+       headers[1] = TLP_CFG_DW1(TLP_REQ_ID(pcie->root_bus_nr, RP_DEVFN),
                                        TLP_WRITE_TAG, byte_en);
        headers[2] = TLP_CFG_DW2(bus, devfn, where);