From b9a4acac282eff60cba800bdbc5a3b57c33c10be Mon Sep 17 00:00:00 2001 From: Logan Gunthorpe Date: Thu, 3 Aug 2017 12:19:52 -0600 Subject: [PATCH] NTB: switchtec_ntb: Implement scratchpad registers Seeing there is no dedicated hardware for this, we simply add these as entries in the shared memory window. Thus, we could support any number of them but 128 seems like enough, for now. Signed-off-by: Logan Gunthorpe Reviewed-by: Stephen Bates Reviewed-by: Kurt Schwemmer Acked-by: Allen Hubbe Signed-off-by: Jon Mason --- drivers/ntb/hw/mscc/ntb_hw_switchtec.c | 75 +++++++++++++++++++++++++- 1 file changed, 73 insertions(+), 2 deletions(-) diff --git a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c index 4a6125d2f305..205bd9481122 100644 --- a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c +++ b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c @@ -67,6 +67,7 @@ struct shared_mw { u32 link_sta; u32 partition_id; u64 mw_sizes[MAX_MWS]; + u32 spad[128]; }; #define MAX_DIRECT_MW ARRAY_SIZE(((struct ntb_ctrl_regs *)(0))->bar_entry) @@ -455,22 +456,90 @@ static int switchtec_ntb_peer_db_set(struct ntb_dev *ntb, u64 db_bits) static int switchtec_ntb_spad_count(struct ntb_dev *ntb) { - return 0; + struct switchtec_ntb *sndev = ntb_sndev(ntb); + + return ARRAY_SIZE(sndev->self_shared->spad); } static u32 switchtec_ntb_spad_read(struct ntb_dev *ntb, int idx) { - return 0; + struct switchtec_ntb *sndev = ntb_sndev(ntb); + + if (idx < 0 || idx >= ARRAY_SIZE(sndev->self_shared->spad)) + return 0; + + if (!sndev->self_shared) + return 0; + + return sndev->self_shared->spad[idx]; } static int switchtec_ntb_spad_write(struct ntb_dev *ntb, int idx, u32 val) { + struct switchtec_ntb *sndev = ntb_sndev(ntb); + + if (idx < 0 || idx >= ARRAY_SIZE(sndev->self_shared->spad)) + return -EINVAL; + + if (!sndev->self_shared) + return -EIO; + + sndev->self_shared->spad[idx] = val; + return 0; } +static u32 switchtec_ntb_peer_spad_read(struct ntb_dev *ntb, int pidx, + int sidx) +{ + struct switchtec_ntb *sndev = ntb_sndev(ntb); + + if (pidx != NTB_DEF_PEER_IDX) + return -EINVAL; + + if (sidx < 0 || sidx >= ARRAY_SIZE(sndev->peer_shared->spad)) + return 0; + + if (!sndev->peer_shared) + return 0; + + return ioread32(&sndev->peer_shared->spad[sidx]); +} + static int switchtec_ntb_peer_spad_write(struct ntb_dev *ntb, int pidx, int sidx, u32 val) { + struct switchtec_ntb *sndev = ntb_sndev(ntb); + + if (pidx != NTB_DEF_PEER_IDX) + return -EINVAL; + + if (sidx < 0 || sidx >= ARRAY_SIZE(sndev->peer_shared->spad)) + return -EINVAL; + + if (!sndev->peer_shared) + return -EIO; + + iowrite32(val, &sndev->peer_shared->spad[sidx]); + + return 0; +} + +static int switchtec_ntb_peer_spad_addr(struct ntb_dev *ntb, int pidx, + int sidx, phys_addr_t *spad_addr) +{ + struct switchtec_ntb *sndev = ntb_sndev(ntb); + unsigned long offset; + + if (pidx != NTB_DEF_PEER_IDX) + return -EINVAL; + + offset = (unsigned long)&sndev->peer_shared->spad[sidx] - + (unsigned long)sndev->stdev->mmio; + + if (spad_addr) + *spad_addr = pci_resource_start(ntb->pdev, 0) + offset; + return 0; } @@ -496,7 +565,9 @@ static const struct ntb_dev_ops switchtec_ntb_ops = { .spad_count = switchtec_ntb_spad_count, .spad_read = switchtec_ntb_spad_read, .spad_write = switchtec_ntb_spad_write, + .peer_spad_read = switchtec_ntb_peer_spad_read, .peer_spad_write = switchtec_ntb_peer_spad_write, + .peer_spad_addr = switchtec_ntb_peer_spad_addr, }; static void switchtec_ntb_init_sndev(struct switchtec_ntb *sndev)