From 7feb6b3fbb48ceaceb7a66a9784106abef48e454 Mon Sep 17 00:00:00 2001 From: David C Somayajulu Date: Mon, 20 Nov 2006 16:20:22 -0800 Subject: [PATCH] [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 Signed-off-by: James Bottomley --- drivers/scsi/qla4xxx/ql4_nvram.c | 64 ++++++++++++++++++-------------- 1 file changed, 36 insertions(+), 28 deletions(-) diff --git a/drivers/scsi/qla4xxx/ql4_nvram.c b/drivers/scsi/qla4xxx/ql4_nvram.c index fc502039540..58afd135aa1 100644 --- a/drivers/scsi/qla4xxx/ql4_nvram.c +++ b/drivers/scsi/qla4xxx/ql4_nvram.c @@ -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; } -- 2.41.1