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Commit 7feb6b3f authored Nov 20, 2006 by David C Somayajulu Committed by James Bottomley Nov 22, 2006

[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>

parent b448de47

drivers/scsi/qla4xxx/ql4_nvram.c

+36 −28

Original line number	Diff line number	Diff line
		@@ -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;
		}