xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

netxen: implement generic pcie semaphore functions

Browse Source 
Implement common function for locking/unlocking 8 hardware
semaphores used for serializing access to shared resouces
on a NIC board by different PCI functions.

As by definition, callers of these semaphore API can be
put to sleep till the semaphore is locked.

Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dhananjay Phadke
2009-08-24 19:23:26 +00:00
committed by David S. Miller
parent cb7e4b6e37
commit c9517e5893
6 changed files with 71 additions and 144 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
drivers/net/netxen/netxen_nic_init.c
View File

@@ -369,37 +369,7 @@ static u32 netxen_decode_crb_addr(u32 addr)
return (pci_base + offset);
}
static long rom_max_timeout = 100;
static long rom_lock_timeout = 10000;
static int rom_lock(struct netxen_adapter *adapter)
{
int iter;
u32 done = 0;
int timeout = 0;
while (!done) {
/* acquire semaphore2 from PCI HW block */
done = NXRD32(adapter, NETXEN_PCIE_REG(PCIE_SEM2_LOCK));
if (done == 1)
break;
if (timeout >= rom_lock_timeout)
return -EIO;
timeout++;
/*
* Yield CPU
*/
if (!in_atomic())
schedule();
else {
for (iter = 0; iter < 20; iter++)
cpu_relax(); /*This a nop instr on i386 */
}
}
NXWR32(adapter, NETXEN_ROM_LOCK_ID, ROM_LOCK_DRIVER);
return 0;
}
#define NETXEN_MAX_ROM_WAIT_USEC 100
static int netxen_wait_rom_done(struct netxen_adapter *adapter)
{
@@ -411,22 +381,16 @@ static int netxen_wait_rom_done(struct netxen_adapter *adapter)
while (done == 0) {
done = NXRD32(adapter, NETXEN_ROMUSB_GLB_STATUS);
done &= 2;
timeout++;
if (timeout >= rom_max_timeout) {
printk("Timeout reached waiting for rom done");
if (++timeout >= NETXEN_MAX_ROM_WAIT_USEC) {
dev_err(&adapter->pdev->dev,
"Timeout reached waiting for rom done");
return -EIO;
}
udelay(1);
}
return 0;
}
static void netxen_rom_unlock(struct netxen_adapter *adapter)
{
/* release semaphore2 */
NXRD32(adapter, NETXEN_PCIE_REG(PCIE_SEM2_UNLOCK));
}
static int do_rom_fast_read(struct netxen_adapter *adapter,
int addr, int *valp)
{
@@ -471,7 +435,7 @@ netxen_rom_fast_read_words(struct netxen_adapter *adapter, int addr,
{
int ret;
ret = rom_lock(adapter);
ret = netxen_rom_lock(adapter);
if (ret < 0)
return ret;
@@ -485,7 +449,7 @@ int netxen_rom_fast_read(struct netxen_adapter *adapter, int addr, int *valp)
{
int ret;
if (rom_lock(adapter) != 0)
if (netxen_rom_lock(adapter) != 0)
return -EIO;
ret = do_rom_fast_read(adapter, addr, valp);
@@ -506,7 +470,7 @@ int netxen_pinit_from_rom(struct netxen_adapter *adapter, int verbose)
u32 off;
/* resetall */
rom_lock(adapter);
netxen_rom_lock(adapter);
NXWR32(adapter, NETXEN_ROMUSB_GLB_SW_RESET, 0xffffffff);
netxen_rom_unlock(adapter);