From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dennis Dalessandro Subject: [PATCH 07/54] staging/rdma/hfi1: Support external device configuration requests from 8051 Date: Wed, 03 Feb 2016 14:31:31 -0800 Message-ID: <20160203223127.5923.12250.stgit@scvm10.sc.intel.com> References: <20160203222512.5923.30980.stgit@scvm10.sc.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20160203222512.5923.30980.stgit-9QXIwq+3FY+1XWohqUldA0EOCMrvLtNR@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Easwar Hariharan , Dean Luick List-Id: linux-rdma@vger.kernel.org From: Easwar Hariharan This patch implements support for turning on and off the clock data recovery mechanisms implemented in QSFP cable on request by the DC 8051 on a per-lane basis. Reviewed-by: Dean Luick Signed-off-by: Easwar Hariharan --- drivers/staging/rdma/hfi1/chip.c | 52 ++++++++++++++++++++++++++++++++++---- drivers/staging/rdma/hfi1/chip.h | 1 + drivers/staging/rdma/hfi1/hfi.h | 1 + drivers/staging/rdma/hfi1/init.c | 1 + 4 files changed, 49 insertions(+), 6 deletions(-) diff --git a/drivers/staging/rdma/hfi1/chip.c b/drivers/staging/rdma/hfi1/chip.c index 4d70a96..41af05e 100644 --- a/drivers/staging/rdma/hfi1/chip.c +++ b/drivers/staging/rdma/hfi1/chip.c @@ -6085,13 +6085,19 @@ static void hreq_response(struct hfi1_devdata *dd, u8 return_code, u16 rsp_data) } /* - * Handle requests from the 8051. + * Handle host requests from the 8051. + * + * This is a work-queue function outside of the interrupt. */ -static void handle_8051_request(struct hfi1_devdata *dd) +void handle_8051_request(struct work_struct *work) { + struct hfi1_pportdata *ppd = container_of(work, struct hfi1_pportdata, + dc_host_req_work); + struct hfi1_devdata *dd = ppd->dd; u64 reg; - u16 data; - u8 type; + u16 data = 0; + u8 type, i, lanes, *cache = ppd->qsfp_info.cache; + u8 cdr_ctrl_byte = cache[QSFP_CDR_CTRL_BYTE_OFFS]; reg = read_csr(dd, DC_DC8051_CFG_EXT_DEV_1); if ((reg & DC_DC8051_CFG_EXT_DEV_1_REQ_NEW_SMASK) == 0) @@ -6112,12 +6118,46 @@ static void handle_8051_request(struct hfi1_devdata *dd) case HREQ_READ_CONFIG: case HREQ_SET_TX_EQ_ABS: case HREQ_SET_TX_EQ_REL: - case HREQ_ENABLE: dd_dev_info(dd, "8051 request: request 0x%x not supported\n", type); hreq_response(dd, HREQ_NOT_SUPPORTED, 0); break; + case HREQ_ENABLE: + lanes = data & 0xF; + for (i = 0; lanes; lanes >>= 1, i++) { + if (!(lanes & 1)) + continue; + if (data & 0x200) { + /* enable TX CDR */ + if (cache[QSFP_MOD_PWR_OFFS] & 0x8 && + cache[QSFP_CDR_INFO_OFFS] & 0x80) + cdr_ctrl_byte |= (1 << (i + 4)); + } else { + /* disable TX CDR */ + if (cache[QSFP_MOD_PWR_OFFS] & 0x8 && + cache[QSFP_CDR_INFO_OFFS] & 0x80) + cdr_ctrl_byte &= ~(1 << (i + 4)); + } + + if (data & 0x800) { + /* enable RX CDR */ + if (cache[QSFP_MOD_PWR_OFFS] & 0x4 && + cache[QSFP_CDR_INFO_OFFS] & 0x40) + cdr_ctrl_byte |= (1 << i); + } else { + /* disable RX CDR */ + if (cache[QSFP_MOD_PWR_OFFS] & 0x4 && + cache[QSFP_CDR_INFO_OFFS] & 0x40) + cdr_ctrl_byte &= ~(1 << i); + } + } + qsfp_write(ppd, ppd->dd->hfi1_id, QSFP_CDR_CTRL_BYTE_OFFS, + &cdr_ctrl_byte, 1); + hreq_response(dd, HREQ_SUCCESS, data); + refresh_qsfp_cache(ppd, &ppd->qsfp_info); + break; + case HREQ_CONFIG_DONE: hreq_response(dd, HREQ_SUCCESS, 0); break; @@ -7373,7 +7413,7 @@ static void handle_8051_interrupt(struct hfi1_devdata *dd, u32 unused, u64 reg) host_msg &= ~(u64)LINKUP_ACHIEVED; } if (host_msg & EXT_DEVICE_CFG_REQ) { - handle_8051_request(dd); + queue_work(ppd->hfi1_wq, &ppd->dc_host_req_work); host_msg &= ~(u64)EXT_DEVICE_CFG_REQ; } if (host_msg & VERIFY_CAP_FRAME) { diff --git a/drivers/staging/rdma/hfi1/chip.h b/drivers/staging/rdma/hfi1/chip.h index 5e4fe43..0e95f0b 100644 --- a/drivers/staging/rdma/hfi1/chip.h +++ b/drivers/staging/rdma/hfi1/chip.h @@ -647,6 +647,7 @@ void handle_verify_cap(struct work_struct *work); void handle_freeze(struct work_struct *work); void handle_link_up(struct work_struct *work); void handle_link_down(struct work_struct *work); +void handle_8051_request(struct work_struct *work); void handle_link_downgrade(struct work_struct *work); void handle_link_bounce(struct work_struct *work); void handle_sma_message(struct work_struct *work); diff --git a/drivers/staging/rdma/hfi1/hfi.h b/drivers/staging/rdma/hfi1/hfi.h index f79b070..0fe630e 100644 --- a/drivers/staging/rdma/hfi1/hfi.h +++ b/drivers/staging/rdma/hfi1/hfi.h @@ -589,6 +589,7 @@ struct hfi1_pportdata { struct work_struct link_vc_work; struct work_struct link_up_work; struct work_struct link_down_work; + struct work_struct dc_host_req_work; struct work_struct sma_message_work; struct work_struct freeze_work; struct work_struct link_downgrade_work; diff --git a/drivers/staging/rdma/hfi1/init.c b/drivers/staging/rdma/hfi1/init.c index 354935f..2851e90 100644 --- a/drivers/staging/rdma/hfi1/init.c +++ b/drivers/staging/rdma/hfi1/init.c @@ -495,6 +495,7 @@ void hfi1_init_pportdata(struct pci_dev *pdev, struct hfi1_pportdata *ppd, INIT_WORK(&ppd->link_vc_work, handle_verify_cap); INIT_WORK(&ppd->link_up_work, handle_link_up); INIT_WORK(&ppd->link_down_work, handle_link_down); + INIT_WORK(&ppd->dc_host_req_work, handle_8051_request); INIT_WORK(&ppd->freeze_work, handle_freeze); INIT_WORK(&ppd->link_downgrade_work, handle_link_downgrade); INIT_WORK(&ppd->sma_message_work, handle_sma_message); -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html