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[SCSI] qla4xxx: fix for timing issue for nvram accesses. 

This patch fixes a timing issue related to nvram accesses in qla4xxx
driver for some cpu/slot speed combination.

Signed-off-by: David Somayajulu <david.somayajulu@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
David C Somayajulu 2006-11-20 16:20:22 -08:00 committed by James Bottomley
parent b448de4731
commit 7feb6b3fbb
1 changed files with 36 additions and 28 deletions
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64
drivers/scsi/qla4xxx/ql4_nvram.c
View File

@ -7,6 +7,13 @@
#include "ql4_def.h"
static inline void eeprom_cmd(uint32_t cmd, struct scsi_qla_host *ha)
{
writel(cmd, isp_nvram(ha));
readl(isp_nvram(ha));
udelay(1);
}
static inline int eeprom_size(struct scsi_qla_host *ha)
{
return is_qla4010(ha) ? FM93C66A_SIZE_16 : FM93C86A_SIZE_16;
@ -28,8 +35,7 @@ static int fm93c56a_select(struct scsi_qla_host * ha)
DEBUG5(printk(KERN_ERR "fm93c56a_select:\n"));
ha->eeprom_cmd_data = AUBURN_EEPROM_CS_1 | 0x000f0000;
writel(ha->eeprom_cmd_data, isp_nvram(ha));
readl(isp_nvram(ha));
eeprom_cmd(ha->eeprom_cmd_data, ha);
return 1;
}
@ -41,12 +47,13 @@ static int fm93c56a_cmd(struct scsi_qla_host * ha, int cmd, int addr)
int previousBit;
/* Clock in a zero, then do the start bit. */
writel(ha->eeprom_cmd_data | AUBURN_EEPROM_DO_1, isp_nvram(ha));
writel(ha->eeprom_cmd_data | AUBURN_EEPROM_DO_1 |
AUBURN_EEPROM_CLK_RISE, isp_nvram(ha));
writel(ha->eeprom_cmd_data | AUBURN_EEPROM_DO_1 |
AUBURN_EEPROM_CLK_FALL, isp_nvram(ha));
readl(isp_nvram(ha));
eeprom_cmd(ha->eeprom_cmd_data | AUBURN_EEPROM_DO_1, ha);
eeprom_cmd(ha->eeprom_cmd_data | AUBURN_EEPROM_DO_1 |
AUBURN_EEPROM_CLK_RISE, ha);
eeprom_cmd(ha->eeprom_cmd_data | AUBURN_EEPROM_DO_1 |
AUBURN_EEPROM_CLK_FALL, ha);
mask = 1 << (FM93C56A_CMD_BITS - 1);
/* Force the previous data bit to be different. */
@ -60,14 +67,14 @@ static int fm93c56a_cmd(struct scsi_qla_host * ha, int cmd, int addr)
* If the bit changed, then change the DO state to
* match.
*/
writel(ha->eeprom_cmd_data | dataBit, isp_nvram(ha));
eeprom_cmd(ha->eeprom_cmd_data | dataBit, ha);
previousBit = dataBit;
}
writel(ha->eeprom_cmd_data | dataBit |
AUBURN_EEPROM_CLK_RISE, isp_nvram(ha));
writel(ha->eeprom_cmd_data | dataBit |
AUBURN_EEPROM_CLK_FALL, isp_nvram(ha));
readl(isp_nvram(ha));
eeprom_cmd(ha->eeprom_cmd_data | dataBit |
AUBURN_EEPROM_CLK_RISE, ha);
eeprom_cmd(ha->eeprom_cmd_data | dataBit |
AUBURN_EEPROM_CLK_FALL, ha);
cmd = cmd << 1;
}
mask = 1 << (eeprom_no_addr_bits(ha) - 1);
@ -82,14 +89,15 @@ static int fm93c56a_cmd(struct scsi_qla_host * ha, int cmd, int addr)
* If the bit changed, then change the DO state to
* match.
*/
writel(ha->eeprom_cmd_data | dataBit, isp_nvram(ha));
eeprom_cmd(ha->eeprom_cmd_data | dataBit, ha);
previousBit = dataBit;
}
writel(ha->eeprom_cmd_data | dataBit |
AUBURN_EEPROM_CLK_RISE, isp_nvram(ha));
writel(ha->eeprom_cmd_data | dataBit |
AUBURN_EEPROM_CLK_FALL, isp_nvram(ha));
readl(isp_nvram(ha));
eeprom_cmd(ha->eeprom_cmd_data | dataBit |
AUBURN_EEPROM_CLK_RISE, ha);
eeprom_cmd(ha->eeprom_cmd_data | dataBit |
AUBURN_EEPROM_CLK_FALL, ha);
addr = addr << 1;
}
return 1;
@ -98,8 +106,7 @@ static int fm93c56a_cmd(struct scsi_qla_host * ha, int cmd, int addr)
static int fm93c56a_deselect(struct scsi_qla_host * ha)
{
ha->eeprom_cmd_data = AUBURN_EEPROM_CS_0 | 0x000f0000;
writel(ha->eeprom_cmd_data, isp_nvram(ha));
readl(isp_nvram(ha));
eeprom_cmd(ha->eeprom_cmd_data, ha);
return 1;
}
@ -112,12 +119,13 @@ static int fm93c56a_datain(struct scsi_qla_host * ha, unsigned short *value)
/* Read the data bits
* The first bit is a dummy. Clock right over it. */
for (i = 0; i < eeprom_no_data_bits(ha); i++) {
writel(ha->eeprom_cmd_data |
AUBURN_EEPROM_CLK_RISE, isp_nvram(ha));
writel(ha->eeprom_cmd_data |
AUBURN_EEPROM_CLK_FALL, isp_nvram(ha));
dataBit =
(readw(isp_nvram(ha)) & AUBURN_EEPROM_DI_1) ? 1 : 0;
eeprom_cmd(ha->eeprom_cmd_data |
AUBURN_EEPROM_CLK_RISE, ha);
eeprom_cmd(ha->eeprom_cmd_data |
AUBURN_EEPROM_CLK_FALL, ha);
dataBit = (readw(isp_nvram(ha)) & AUBURN_EEPROM_DI_1) ? 1 : 0;
data = (data << 1) | dataBit;
}