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NTB: switchtec_ntb: Add skeleton NTB driver

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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>
Acked-by: Allen Hubbe <Allen.Hubbe@dell.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Logan Gunthorpe 2017-08-03 12:19:49 -06:00 committed by Jon Mason
parent 3dd4db475c
commit e099b45b7c
2 changed files with 150 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

148
drivers/ntb/hw/mscc/ntb_hw_switchtec.c
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@ -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;
@ -517,7 +657,6 @@ 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);
@ -535,11 +674,17 @@ static int switchtec_ntb_add(struct device *dev,
if (rc)
goto deinit_shared_and_exit;
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:
@ -558,6 +703,7 @@ 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);

3
include/linux/ntb.h
View File

@ -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";
}