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mlxsw: pci: Implement reset done check

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Firmware now tells us that the reset is done by passing a magic value
via register. Use it to shorten the wait in case this is supported.
With old firmware, we still wait until the timeout is reached.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2016-03-10 23:10:21 +01:00 committed by David S. Miller
parent cea8768f33
commit 233fa44bd6
2 changed files with 14 additions and 4 deletions
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15
drivers/net/ethernet/mellanox/mlxsw/pci.c
View File

@ -1681,11 +1681,18 @@ static const struct mlxsw_bus mlxsw_pci_bus = {
static int mlxsw_pci_sw_reset(struct mlxsw_pci *mlxsw_pci)
{
unsigned long end;
mlxsw_pci_write32(mlxsw_pci, SW_RESET, MLXSW_PCI_SW_RESET_RST_BIT);
/* Current firware does not let us know when the reset is done.
* So we just wait here for constant time and hope for the best.
*/
msleep(MLXSW_PCI_SW_RESET_TIMEOUT_MSECS);
wmb(); /* reset needs to be written before we read control register */
end = jiffies + msecs_to_jiffies(MLXSW_PCI_SW_RESET_TIMEOUT_MSECS);
do {
u32 val = mlxsw_pci_read32(mlxsw_pci, FW_READY);
if ((val & MLXSW_PCI_FW_READY_MASK) == MLXSW_PCI_FW_READY_MAGIC)
break;
cond_resched();
} while (time_before(jiffies, end));
return 0;
}

3
drivers/net/ethernet/mellanox/mlxsw/pci.h
View File

@ -61,6 +61,9 @@
#define MLXSW_PCI_SW_RESET 0xF0010
#define MLXSW_PCI_SW_RESET_RST_BIT BIT(0)
#define MLXSW_PCI_SW_RESET_TIMEOUT_MSECS 5000
#define MLXSW_PCI_FW_READY 0xA1844
#define MLXSW_PCI_FW_READY_MASK 0xFF
#define MLXSW_PCI_FW_READY_MAGIC 0x5E
#define MLXSW_PCI_DOORBELL_SDQ_OFFSET 0x000
#define MLXSW_PCI_DOORBELL_RDQ_OFFSET 0x200