[PATCH v2 11/16] switchtec_ntb: add skeleton NTB driver

Logan Gunthorpe
2017-07-18T16:06:33Z

Add a skeleton NTB driver which will be filled out in subsequent patches.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Stephen Bates <sbates@raithlin.com>
Reviewed-by: Kurt Schwemmer <kurt.schwemmer@microsemi.com>
---
drivers/ntb/hw/mscc/switchtec_ntb.c | 148 +++++++++++++++++++++++++++++++++++-
include/linux/ntb.h | 3 +
2 files changed, 150 insertions(+), 1 deletion(-)

diff --git a/drivers/ntb/hw/mscc/switchtec_ntb.c b/drivers/ntb/hw/mscc/switchtec_ntb.c
index 852dc9869a3e..20f2fdda4644 100644
--- a/drivers/ntb/hw/mscc/switchtec_ntb.c
+++ b/drivers/ntb/hw/mscc/switchtec_ntb.c
@@ -18,6 +18,7 @@
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/interrupt.h>
+#include <linux/ntb.h>

MODULE_DESCRIPTION("Microsemi Switchtec(tm) NTB Driver");
MODULE_VERSION("0.1");
@@ -71,6 +72,7 @@ struct shared_mw {
#define LUT_SIZE SZ_64K

struct switchtec_ntb {
+ struct ntb_dev ntb;
struct switchtec_dev *stdev;

int self_partition;
@@ -161,10 +163,148 @@ static int switchtec_ntb_part_op(struct switchtec_ntb *sndev,
return -EIO;
}

+static int switchtec_ntb_mw_count(struct ntb_dev *ntb, int pidx)
+{
+ return 0;
+}
+
+static int switchtec_ntb_mw_get_align(struct ntb_dev *ntb, int pidx,
+ int widx, resource_size_t *addr_align,
+ resource_size_t *size_align,
+ resource_size_t *size_max)
+{
+ return 0;
+}
+
+static int switchtec_ntb_mw_set_trans(struct ntb_dev *ntb, int pidx, int widx,
+ dma_addr_t addr, resource_size_t size)
+{
+ return 0;
+}
+
+static int switchtec_ntb_peer_mw_count(struct ntb_dev *ntb)
+{
+ return 0;
+}
+
+static int switchtec_ntb_peer_mw_get_addr(struct ntb_dev *ntb, int idx,
+ phys_addr_t *base,
+ resource_size_t *size)
+{
+ return 0;
+}
+
+static u64 switchtec_ntb_link_is_up(struct ntb_dev *ntb,
+ enum ntb_speed *speed,
+ enum ntb_width *width)
+{
+ return 0;
+}
+
+static int switchtec_ntb_link_enable(struct ntb_dev *ntb,
+ enum ntb_speed max_speed,
+ enum ntb_width max_width)
+{
+ return 0;
+}
+
+static int switchtec_ntb_link_disable(struct ntb_dev *ntb)
+{
+ return 0;
+}
+
+static u64 switchtec_ntb_db_valid_mask(struct ntb_dev *ntb)
+{
+ return 0;
+}
+
+static int switchtec_ntb_db_vector_count(struct ntb_dev *ntb)
+{
+ return 0;
+}
+
+static u64 switchtec_ntb_db_vector_mask(struct ntb_dev *ntb, int db_vector)
+{
+ return 0;
+}
+
+static u64 switchtec_ntb_db_read(struct ntb_dev *ntb)
+{
+ return 0;
+}
+
+static int switchtec_ntb_db_clear(struct ntb_dev *ntb, u64 db_bits)
+{
+ return 0;
+}
+
+static int switchtec_ntb_db_set_mask(struct ntb_dev *ntb, u64 db_bits)
+{
+ return 0;
+}
+
+static int switchtec_ntb_db_clear_mask(struct ntb_dev *ntb, u64 db_bits)
+{
+ return 0;
+}
+
+static int switchtec_ntb_peer_db_set(struct ntb_dev *ntb, u64 db_bits)
+{
+ return 0;
+}
+
+static int switchtec_ntb_spad_count(struct ntb_dev *ntb)
+{
+ return 0;
+}
+
+static u32 switchtec_ntb_spad_read(struct ntb_dev *ntb, int idx)
+{
+ return 0;
+}
+
+static int switchtec_ntb_spad_write(struct ntb_dev *ntb, int idx, u32 val)
+{
+ return 0;
+}
+
+static int switchtec_ntb_peer_spad_write(struct ntb_dev *ntb, int pidx,
+ int sidx, u32 val)
+{
+ return 0;
+}
+
+static const struct ntb_dev_ops switchtec_ntb_ops = {
+ .mw_count = switchtec_ntb_mw_count,
+ .mw_get_align = switchtec_ntb_mw_get_align,
+ .mw_set_trans = switchtec_ntb_mw_set_trans,
+ .peer_mw_count = switchtec_ntb_peer_mw_count,
+ .peer_mw_get_addr = switchtec_ntb_peer_mw_get_addr,
+ .link_is_up = switchtec_ntb_link_is_up,
+ .link_enable = switchtec_ntb_link_enable,
+ .link_disable = switchtec_ntb_link_disable,
+ .db_valid_mask = switchtec_ntb_db_valid_mask,
+ .db_vector_count = switchtec_ntb_db_vector_count,
+ .db_vector_mask = switchtec_ntb_db_vector_mask,
+ .db_read = switchtec_ntb_db_read,
+ .db_clear = switchtec_ntb_db_clear,
+ .db_set_mask = switchtec_ntb_db_set_mask,
+ .db_clear_mask = switchtec_ntb_db_clear_mask,
+ .peer_db_set = switchtec_ntb_peer_db_set,
+ .spad_count = switchtec_ntb_spad_count,
+ .spad_read = switchtec_ntb_spad_read,
+ .spad_write = switchtec_ntb_spad_write,
+ .peer_spad_write = switchtec_ntb_peer_spad_write,
+};
+
static void switchtec_ntb_init_sndev(struct switchtec_ntb *sndev)
{
u64 part_map;

+ sndev->ntb.pdev = sndev->stdev->pdev;
+ sndev->ntb.topo = NTB_TOPO_SWITCH;
+ sndev->ntb.ops = &switchtec_ntb_ops;
+
sndev->self_partition = sndev->stdev->partition;

sndev->mmio_ntb = sndev->stdev->mmio_ntb;
@@ -512,7 +652,6 @@ static int switchtec_ntb_add(struct device *dev,
return -ENOMEM;

sndev->stdev = stdev;
-
switchtec_ntb_init_sndev(sndev);
switchtec_ntb_init_mw(sndev);
switchtec_ntb_init_db(sndev);
@@ -532,11 +671,17 @@ static int switchtec_ntb_add(struct device *dev,

switchtec_ntb_init_mw(sndev);

+ rc = ntb_register_device(&sndev->ntb);
+ if (rc)
+ goto deinit_and_exit;
+
stdev->sndev = sndev;
dev_info(dev, "NTB device registered");

return 0;

+deinit_and_exit:
+ switchtec_ntb_deinit_db_msg_irq(sndev);
deinit_shared_and_exit:
switchtec_ntb_deinit_shared_mw(sndev);
free_and_exit:
@@ -555,6 +700,7 @@ void switchtec_ntb_remove(struct device *dev,
return;

stdev->sndev = NULL;
+ ntb_unregister_device(&sndev->ntb);
switchtec_ntb_deinit_db_msg_irq(sndev);
switchtec_ntb_deinit_shared_mw(sndev);
kfree(sndev);
diff --git a/include/linux/ntb.h b/include/linux/ntb.h
index 47f2966cfd7f..c308964777eb 100644
--- a/include/linux/ntb.h
+++ b/include/linux/ntb.h
@@ -70,6 +70,7 @@ struct pci_dev;
* @NTB_TOPO_SEC: On secondary side of remote ntb.
* @NTB_TOPO_B2B_USD: On primary side of local ntb upstream of remote ntb.
* @NTB_TOPO_B2B_DSD: On primary side of local ntb downstream of remote ntb.
+ * @NTB_TOPO_SWITCH: Connected via a switch which supports ntb.
*/
enum ntb_topo {
NTB_TOPO_NONE = -1,
@@ -77,6 +78,7 @@ enum ntb_topo {
NTB_TOPO_SEC,
NTB_TOPO_B2B_USD,
NTB_TOPO_B2B_DSD,
+ NTB_TOPO_SWITCH,
};

static inline int ntb_topo_is_b2b(enum ntb_topo topo)
@@ -97,6 +99,7 @@ static inline char *ntb_topo_string(enum ntb_topo topo)
case NTB_TOPO_SEC: return "NTB_TOPO_SEC";
case NTB_TOPO_B2B_USD: return "NTB_TOPO_B2B_USD";
case NTB_TOPO_B2B_DSD: return "NTB_TOPO_B2B_DSD";
+ case NTB_TOPO_SWITCH: return "NTB_TOPO_SWITCH";
}
return "NTB_TOPO_INVALID";
}
--
2.11.0