cxl: Configure the PSL for two CAPI ports on POWER8NVL

The POWER8NVL chip has two CAPI ports.  Configure the PSL to route
data to the port corresponding to the CAPP unit.

Signed-off-by: Philippe Bergheaud <felix@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
index 2844e97..94fd3f7 100644 (file)
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -21,6 +21,7 @@
 #include <asm/msi_bitmap.h>
 #include <asm/pnv-pci.h>
 #include <asm/io.h>
+#include <asm/reg.h>
 
 #include "cxl.h"
 #include <misc/cxl.h>
@@ -321,12 +322,43 @@ static void dump_afu_descriptor(struct cxl_afu *afu)
 #undef show_reg
 }
 
+#define CAPP_UNIT0_ID 0xBA
+#define CAPP_UNIT1_ID 0XBE
+
+static u64 get_capp_unit_id(struct device_node *np)
+{
+       u32 phb_index;
+
+       /*
+        * For chips other than POWER8NVL, we only have CAPP 0,
+        * irrespective of which PHB is used.
+        */
+       if (!pvr_version_is(PVR_POWER8NVL))
+               return CAPP_UNIT0_ID;
+
+       /*
+        * For POWER8NVL, assume CAPP 0 is attached to PHB0 and
+        * CAPP 1 is attached to PHB1.
+        */
+       if (of_property_read_u32(np, "ibm,phb-index", &phb_index))
+               return 0;
+
+       if (phb_index == 0)
+               return CAPP_UNIT0_ID;
+
+       if (phb_index == 1)
+               return CAPP_UNIT1_ID;
+
+       return 0;
+}
+
 static int init_implementation_adapter_regs(struct cxl *adapter, struct pci_dev *dev)
 {
        struct device_node *np;
        const __be32 *prop;
        u64 psl_dsnctl;
        u64 chipid;
+       u64 capp_unit_id;
 
        if (!(np = pnv_pci_get_phb_node(dev)))
                return -ENODEV;
@@ -336,10 +368,17 @@ static int init_implementation_adapter_regs(struct cxl *adapter, struct pci_dev
        if (!np)
                return -ENODEV;
        chipid = be32_to_cpup(prop);
+       capp_unit_id = get_capp_unit_id(np);
        of_node_put(np);
+       if (!capp_unit_id) {
+               pr_err("cxl: invalid capp unit id\n");
+               return -ENODEV;
+       }
 
        /* Tell PSL where to route data to */
-       psl_dsnctl = 0x02E8900002000000ULL | (chipid << (63-5));
+       psl_dsnctl = 0x0000900002000000ULL | (chipid << (63-5));
+       psl_dsnctl |= (capp_unit_id << (63-13));
+
        cxl_p1_write(adapter, CXL_PSL_DSNDCTL, psl_dsnctl);
        cxl_p1_write(adapter, CXL_PSL_RESLCKTO, 0x20000000200ULL);
        /* snoop write mask */