diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ntb/hw/mscc/ntb_hw_switchtec.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c index 831bfdf40068..175ac0baa7a0 100644 --- a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c +++ b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c @@ -17,6 +17,7 @@ #include <linux/module.h> #include <linux/delay.h> #include <linux/kthread.h> +#include <linux/interrupt.h> MODULE_DESCRIPTION("Microsemi Switchtec(tm) NTB Driver"); MODULE_VERSION("0.1"); @@ -75,6 +76,9 @@ struct switchtec_ntb { int self_partition; int peer_partition; + int doorbell_irq; + int message_irq; + struct ntb_info_regs __iomem *mmio_ntb; struct ntb_ctrl_regs __iomem *mmio_ctrl; struct ntb_dbmsg_regs __iomem *mmio_dbmsg; @@ -86,6 +90,11 @@ struct switchtec_ntb { struct shared_mw __iomem *peer_shared; dma_addr_t self_shared_dma; + u64 db_mask; + u64 db_valid_mask; + int db_shift; + int db_peer_shift; + int nr_direct_mw; int nr_lut_mw; int direct_mw_to_bar[MAX_DIRECT_MW]; @@ -215,6 +224,49 @@ static void switchtec_ntb_init_mw(struct switchtec_ntb *sndev) } +/* + * There are 64 doorbells in the switch hardware but this is + * shared among all partitions. So we must split them in half + * (32 for each partition). However, the message interrupts are + * also shared with the top 4 doorbells so we just limit this to + * 28 doorbells per partition + */ +static void switchtec_ntb_init_db(struct switchtec_ntb *sndev) +{ + sndev->db_valid_mask = 0x0FFFFFFF; + + if (sndev->self_partition < sndev->peer_partition) { + sndev->db_shift = 0; + sndev->db_peer_shift = 32; + } else { + sndev->db_shift = 32; + sndev->db_peer_shift = 0; + } + + sndev->db_mask = 0x0FFFFFFFFFFFFFFFULL; + iowrite64(~sndev->db_mask, &sndev->mmio_self_dbmsg->idb_mask); + iowrite64(sndev->db_valid_mask << sndev->db_peer_shift, + &sndev->mmio_self_dbmsg->odb_mask); +} + +static void switchtec_ntb_init_msgs(struct switchtec_ntb *sndev) +{ + int i; + u32 msg_map = 0; + + for (i = 0; i < ARRAY_SIZE(sndev->mmio_self_dbmsg->imsg); i++) { + int m = i | sndev->peer_partition << 2; + + msg_map |= m << i * 8; + } + + iowrite32(msg_map, &sndev->mmio_self_dbmsg->msg_map); + + for (i = 0; i < ARRAY_SIZE(sndev->mmio_self_dbmsg->imsg); i++) + iowrite64(NTB_DBMSG_IMSG_STATUS | NTB_DBMSG_IMSG_MASK, + &sndev->mmio_self_dbmsg->imsg[i]); +} + static int switchtec_ntb_init_req_id_table(struct switchtec_ntb *sndev) { int rc = 0; @@ -364,6 +416,87 @@ static void switchtec_ntb_deinit_shared_mw(struct switchtec_ntb *sndev) sndev->self_shared_dma); } +static irqreturn_t switchtec_ntb_doorbell_isr(int irq, void *dev) +{ + struct switchtec_ntb *sndev = dev; + + dev_dbg(&sndev->stdev->dev, "doorbell\n"); + + return IRQ_HANDLED; +} + +static irqreturn_t switchtec_ntb_message_isr(int irq, void *dev) +{ + int i; + struct switchtec_ntb *sndev = dev; + + for (i = 0; i < ARRAY_SIZE(sndev->mmio_self_dbmsg->imsg); i++) { + u64 msg = ioread64(&sndev->mmio_self_dbmsg->imsg[i]); + + if (msg & NTB_DBMSG_IMSG_STATUS) { + dev_dbg(&sndev->stdev->dev, "message: %d %08x\n", i, + (u32)msg); + iowrite8(1, &sndev->mmio_self_dbmsg->imsg[i].status); + } + } + + return IRQ_HANDLED; +} + +static int switchtec_ntb_init_db_msg_irq(struct switchtec_ntb *sndev) +{ + int i; + int rc; + int doorbell_irq = 0; + int message_irq = 0; + int event_irq; + int idb_vecs = sizeof(sndev->mmio_self_dbmsg->idb_vec_map); + + event_irq = ioread32(&sndev->stdev->mmio_part_cfg->vep_vector_number); + + while (doorbell_irq == event_irq) + doorbell_irq++; + while (message_irq == doorbell_irq || + message_irq == event_irq) + message_irq++; + + dev_dbg(&sndev->stdev->dev, "irqs - event: %d, db: %d, msgs: %d", + event_irq, doorbell_irq, message_irq); + + for (i = 0; i < idb_vecs - 4; i++) + iowrite8(doorbell_irq, + &sndev->mmio_self_dbmsg->idb_vec_map[i]); + + for (; i < idb_vecs; i++) + iowrite8(message_irq, + &sndev->mmio_self_dbmsg->idb_vec_map[i]); + + sndev->doorbell_irq = pci_irq_vector(sndev->stdev->pdev, doorbell_irq); + sndev->message_irq = pci_irq_vector(sndev->stdev->pdev, message_irq); + + rc = request_irq(sndev->doorbell_irq, + switchtec_ntb_doorbell_isr, 0, + "switchtec_ntb_doorbell", sndev); + if (rc) + return rc; + + rc = request_irq(sndev->message_irq, + switchtec_ntb_message_isr, 0, + "switchtec_ntb_message", sndev); + if (rc) { + free_irq(sndev->doorbell_irq, sndev); + return rc; + } + + return 0; +} + +static void switchtec_ntb_deinit_db_msg_irq(struct switchtec_ntb *sndev) +{ + free_irq(sndev->doorbell_irq, sndev); + free_irq(sndev->message_irq, sndev); +} + static int switchtec_ntb_add(struct device *dev, struct class_interface *class_intf) { @@ -387,6 +520,8 @@ static int switchtec_ntb_add(struct device *dev, switchtec_ntb_init_sndev(sndev); switchtec_ntb_init_mw(sndev); + switchtec_ntb_init_db(sndev); + switchtec_ntb_init_msgs(sndev); rc = switchtec_ntb_init_req_id_table(sndev); if (rc) @@ -396,11 +531,17 @@ static int switchtec_ntb_add(struct device *dev, if (rc) goto free_and_exit; + rc = switchtec_ntb_init_db_msg_irq(sndev); + if (rc) + goto deinit_shared_and_exit; + stdev->sndev = sndev; dev_info(dev, "NTB device registered"); return 0; +deinit_shared_and_exit: + switchtec_ntb_deinit_shared_mw(sndev); free_and_exit: kfree(sndev); dev_err(dev, "failed to register ntb device: %d", rc); @@ -417,6 +558,7 @@ void switchtec_ntb_remove(struct device *dev, return; stdev->sndev = NULL; + switchtec_ntb_deinit_db_msg_irq(sndev); switchtec_ntb_deinit_shared_mw(sndev); kfree(sndev); dev_info(dev, "ntb device unregistered"); |