IB/hfi1: Remove ASIC block clear

The ASIC block is shared between two HFIs. Individual devices
should not initialize registers there. Retain the power-on values.
Individual users set registers as needed with one exception.
Clear sbus fast mode on "slow" calls.

Reviewed-by: Mitko Haralanov <mitko.haralanov@intel.com>
Reviewed-by: Easwar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/staging/rdma/hfi1/chip.c b/drivers/staging/rdma/hfi1/chip.c
index 263c882..0874287 100644 (file)
--- a/drivers/staging/rdma/hfi1/chip.c
+++ b/drivers/staging/rdma/hfi1/chip.c
@@ -12934,91 +12934,6 @@ static void reset_cce_csrs(struct hfi1_devdata *dd)
                write_csr(dd, CCE_INT_COUNTER_ARRAY32 + (8 * i), 0);
 }
 
-/* set ASIC CSRs to chip reset defaults */
-static void reset_asic_csrs(struct hfi1_devdata *dd)
-{
-       int i;
-
-       /*
-        * If the HFIs are shared between separate nodes or VMs,
-        * then more will need to be done here.  One idea is a module
-        * parameter that returns early, letting the first power-on or
-        * a known first load do the reset and blocking all others.
-        */
-
-       if (!(dd->flags & HFI1_DO_INIT_ASIC))
-               return;
-
-       if (dd->icode != ICODE_FPGA_EMULATION) {
-               /* emulation does not have an SBus - leave these alone */
-               /*
-                * All writes to ASIC_CFG_SBUS_REQUEST do something.
-                * Notes:
-                * o The reset is not zero if aimed at the core.  See the
-                *   SBus documentation for details.
-                * o If the SBus firmware has been updated (e.g. by the BIOS),
-                *   will the reset revert that?
-                */
-               /* ASIC_CFG_SBUS_REQUEST leave alone */
-               write_csr(dd, ASIC_CFG_SBUS_EXECUTE, 0);
-       }
-       /* ASIC_SBUS_RESULT read-only */
-       write_csr(dd, ASIC_STS_SBUS_COUNTERS, 0);
-       for (i = 0; i < ASIC_NUM_SCRATCH; i++)
-               write_csr(dd, ASIC_CFG_SCRATCH + (8 * i), 0);
-       write_csr(dd, ASIC_CFG_MUTEX, 0);       /* this will clear it */
-
-       /* We might want to retain this state across FLR if we ever use it */
-       write_csr(dd, ASIC_CFG_DRV_STR, 0);
-
-       /* ASIC_CFG_THERM_POLL_EN leave alone */
-       /* ASIC_STS_THERM read-only */
-       /* ASIC_CFG_RESET leave alone */
-
-       write_csr(dd, ASIC_PCIE_SD_HOST_CMD, 0);
-       /* ASIC_PCIE_SD_HOST_STATUS read-only */
-       write_csr(dd, ASIC_PCIE_SD_INTRPT_DATA_CODE, 0);
-       write_csr(dd, ASIC_PCIE_SD_INTRPT_ENABLE, 0);
-       /* ASIC_PCIE_SD_INTRPT_PROGRESS read-only */
-       write_csr(dd, ASIC_PCIE_SD_INTRPT_STATUS, ~0ull); /* clear */
-       /* ASIC_HFI0_PCIE_SD_INTRPT_RSPD_DATA read-only */
-       /* ASIC_HFI1_PCIE_SD_INTRPT_RSPD_DATA read-only */
-       for (i = 0; i < 16; i++)
-               write_csr(dd, ASIC_PCIE_SD_INTRPT_LIST + (8 * i), 0);
-
-       /* ASIC_GPIO_IN read-only */
-       write_csr(dd, ASIC_GPIO_OE, 0);
-       write_csr(dd, ASIC_GPIO_INVERT, 0);
-       write_csr(dd, ASIC_GPIO_OUT, 0);
-       write_csr(dd, ASIC_GPIO_MASK, 0);
-       /* ASIC_GPIO_STATUS read-only */
-       write_csr(dd, ASIC_GPIO_CLEAR, ~0ull);
-       /* ASIC_GPIO_FORCE leave alone */
-
-       /* ASIC_QSFP1_IN read-only */
-       write_csr(dd, ASIC_QSFP1_OE, 0);
-       write_csr(dd, ASIC_QSFP1_INVERT, 0);
-       write_csr(dd, ASIC_QSFP1_OUT, 0);
-       write_csr(dd, ASIC_QSFP1_MASK, 0);
-       /* ASIC_QSFP1_STATUS read-only */
-       write_csr(dd, ASIC_QSFP1_CLEAR, ~0ull);
-       /* ASIC_QSFP1_FORCE leave alone */
-
-       /* ASIC_QSFP2_IN read-only */
-       write_csr(dd, ASIC_QSFP2_OE, 0);
-       write_csr(dd, ASIC_QSFP2_INVERT, 0);
-       write_csr(dd, ASIC_QSFP2_OUT, 0);
-       write_csr(dd, ASIC_QSFP2_MASK, 0);
-       /* ASIC_QSFP2_STATUS read-only */
-       write_csr(dd, ASIC_QSFP2_CLEAR, ~0ull);
-       /* ASIC_QSFP2_FORCE leave alone */
-
-       write_csr(dd, ASIC_EEP_CTL_STAT, ASIC_EEP_CTL_STAT_RESETCSR);
-       /* this also writes a NOP command, clearing paging mode */
-       write_csr(dd, ASIC_EEP_ADDR_CMD, 0);
-       write_csr(dd, ASIC_EEP_DATA, 0);
-}
-
 /* set MISC CSRs to chip reset defaults */
 static void reset_misc_csrs(struct hfi1_devdata *dd)
 {
@@ -13428,14 +13343,11 @@ static void init_chip(struct hfi1_devdata *dd)
                        hfi1_pcie_flr(dd);
                        restore_pci_variables(dd);
                }
-
-               reset_asic_csrs(dd);
        } else {
                dd_dev_info(dd, "Resetting CSRs with writes\n");
                reset_cce_csrs(dd);
                reset_txe_csrs(dd);
                reset_rxe_csrs(dd);
-               reset_asic_csrs(dd);
                reset_misc_csrs(dd);
        }
        /* clear the DC reset */

diff --git a/drivers/staging/rdma/hfi1/firmware.c b/drivers/staging/rdma/hfi1/firmware.c
index d5befd1..ca4e489 100644 (file)
--- a/drivers/staging/rdma/hfi1/firmware.c
+++ b/drivers/staging/rdma/hfi1/firmware.c
@@ -1170,6 +1170,9 @@ int sbus_request_slow(struct hfi1_devdata *dd,
 {
        u64 reg, count = 0;
 
+       /* make sure fast mode is clear */
+       clear_sbus_fast_mode(dd);
+
        sbus_request(dd, receiver_addr, data_addr, command, data_in);
        write_csr(dd, ASIC_CFG_SBUS_EXECUTE,
                  ASIC_CFG_SBUS_EXECUTE_EXECUTE_SMASK);