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s390/ism: move oddities of device IO to wrapper function

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ISM devices are special in how they access PCI memory space. Provide
wrappers for handling commands to the device. No functional change.

Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott
2019-04-23 11:57:46 +02:00
committed by Martin Schwidefsky
parent 81deca12c2
commit c475f1770a
2 changed files with 31 additions and 16 deletions
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27
drivers/s390/net/ism.h
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@@ -6,6 +6,7 @@
#include <linux/types.h>
#include <linux/pci.h>
#include <net/smc.h>
#include <asm/pci_insn.h>
#define UTIL_STR_LEN 16
@@ -194,8 +195,6 @@ struct ism_dev {
struct pci_dev *pdev;
struct smcd_dev *smcd;
void __iomem *ctl;
struct ism_sba *sba;
dma_addr_t sba_dma_addr;
DECLARE_BITMAP(sba_bitmap, ISM_NR_DMBS);
@@ -209,6 +208,30 @@ struct ism_dev {
#define ISM_CREATE_REQ(dmb, idx, sf, offset) \
((dmb) | (idx) << 24 | (sf) << 23 | (offset))
static inline void __ism_read_cmd(struct ism_dev *ism, void *data,
unsigned long offset, unsigned long len)
{
struct zpci_dev *zdev = to_zpci(ism->pdev);
u64 req = ZPCI_CREATE_REQ(zdev->fh, 2, 8);
while (len > 0) {
__zpci_load(data, req, offset);
offset += 8;
data += 8;
len -= 8;
}
}
static inline void __ism_write_cmd(struct ism_dev *ism, void *data,
unsigned long offset, unsigned long len)
{
struct zpci_dev *zdev = to_zpci(ism->pdev);
u64 req = ZPCI_CREATE_REQ(zdev->fh, 2, len);
if (len)
__zpci_store_block(data, req, offset);
}
static inline int __ism_move(struct ism_dev *ism, u64 dmb_req, void *data,
unsigned int size)
{