diff options
Diffstat (limited to 'drivers/scsi/qla4xxx/ql4_nvram.c')
| -rw-r--r-- | drivers/scsi/qla4xxx/ql4_nvram.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/drivers/scsi/qla4xxx/ql4_nvram.c b/drivers/scsi/qla4xxx/ql4_nvram.c new file mode 100644 index 0000000..e3957ca --- /dev/null +++ b/drivers/scsi/qla4xxx/ql4_nvram.c @@ -0,0 +1,224 @@ +/* + * QLogic iSCSI HBA Driver + * Copyright (c) 2003-2006 QLogic Corporation + * + * See LICENSE.qla4xxx for copyright and licensing details. + */ + +#include "ql4_def.h" + +static inline int eeprom_size(struct scsi_qla_host *ha) +{ + return is_qla4022(ha) ? FM93C86A_SIZE_16 : FM93C66A_SIZE_16; +} + +static inline int eeprom_no_addr_bits(struct scsi_qla_host *ha) +{ + return is_qla4022(ha) ? FM93C86A_NO_ADDR_BITS_16 : + FM93C56A_NO_ADDR_BITS_16; +} + +static inline int eeprom_no_data_bits(struct scsi_qla_host *ha) +{ + return FM93C56A_DATA_BITS_16; +} + +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)); + return 1; +} + +static int fm93c56a_cmd(struct scsi_qla_host * ha, int cmd, int addr) +{ + int i; + int mask; + int dataBit; + 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)); + mask = 1 << (FM93C56A_CMD_BITS - 1); + + /* Force the previous data bit to be different. */ + previousBit = 0xffff; + for (i = 0; i < FM93C56A_CMD_BITS; i++) { + dataBit = + (cmd & mask) ? AUBURN_EEPROM_DO_1 : AUBURN_EEPROM_DO_0; + if (previousBit != dataBit) { + + /* + * If the bit changed, then change the DO state to + * match. + */ + writel(ha->eeprom_cmd_data | dataBit, isp_nvram(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)); + cmd = cmd << 1; + } + mask = 1 << (eeprom_no_addr_bits(ha) - 1); + + /* Force the previous data bit to be different. */ + previousBit = 0xffff; + for (i = 0; i < eeprom_no_addr_bits(ha); i++) { + dataBit = addr & mask ? AUBURN_EEPROM_DO_1 : + AUBURN_EEPROM_DO_0; + if (previousBit != dataBit) { + /* + * If the bit changed, then change the DO state to + * match. + */ + writel(ha->eeprom_cmd_data | dataBit, isp_nvram(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)); + addr = addr << 1; + } + return 1; +} + +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)); + return 1; +} + +static int fm93c56a_datain(struct scsi_qla_host * ha, unsigned short *value) +{ + int i; + int data = 0; + int dataBit; + + /* 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; + data = (data << 1) | dataBit; + } + + *value = data; + return 1; +} + +static int eeprom_readword(int eepromAddr, u16 * value, + struct scsi_qla_host * ha) +{ + fm93c56a_select(ha); + fm93c56a_cmd(ha, FM93C56A_READ, eepromAddr); + fm93c56a_datain(ha, value); + fm93c56a_deselect(ha); + return 1; +} + +/* Hardware_lock must be set before calling */ +u16 rd_nvram_word(struct scsi_qla_host * ha, int offset) +{ + u16 val; + + /* NOTE: NVRAM uses half-word addresses */ + eeprom_readword(offset, &val, ha); + return val; +} + +int qla4xxx_is_nvram_configuration_valid(struct scsi_qla_host * ha) +{ + int status = QLA_ERROR; + uint16_t checksum = 0; + uint32_t index; + unsigned long flags; + + spin_lock_irqsave(&ha->hardware_lock, flags); + for (index = 0; index < eeprom_size(ha); index++) + checksum += rd_nvram_word(ha, index); + spin_unlock_irqrestore(&ha->hardware_lock, flags); + + if (checksum == 0) + status = QLA_SUCCESS; + + return status; +} + +/************************************************************************* + * + * Hardware Semaphore routines + * + *************************************************************************/ +int ql4xxx_sem_spinlock(struct scsi_qla_host * ha, u32 sem_mask, u32 sem_bits) +{ + uint32_t value; + unsigned long flags; + unsigned int seconds = 30; + + DEBUG2(printk("scsi%ld : Trying to get SEM lock - mask= 0x%x, code = " + "0x%x\n", ha->host_no, sem_mask, sem_bits)); + do { + spin_lock_irqsave(&ha->hardware_lock, flags); + writel((sem_mask | sem_bits), isp_semaphore(ha)); + value = readw(isp_semaphore(ha)); + spin_unlock_irqrestore(&ha->hardware_lock, flags); + if ((value & (sem_mask >> 16)) == sem_bits) { + DEBUG2(printk("scsi%ld : Got SEM LOCK - mask= 0x%x, " + "code = 0x%x\n", ha->host_no, + sem_mask, sem_bits)); + return QLA_SUCCESS; + } + ssleep(1); + } while (--seconds); + return QLA_ERROR; +} + +void ql4xxx_sem_unlock(struct scsi_qla_host * ha, u32 sem_mask) +{ + unsigned long flags; + + spin_lock_irqsave(&ha->hardware_lock, flags); + writel(sem_mask, isp_semaphore(ha)); + readl(isp_semaphore(ha)); + spin_unlock_irqrestore(&ha->hardware_lock, flags); + + DEBUG2(printk("scsi%ld : UNLOCK SEM - mask= 0x%x\n", ha->host_no, + sem_mask)); +} + +int ql4xxx_sem_lock(struct scsi_qla_host * ha, u32 sem_mask, u32 sem_bits) +{ + uint32_t value; + unsigned long flags; + + spin_lock_irqsave(&ha->hardware_lock, flags); + writel((sem_mask | sem_bits), isp_semaphore(ha)); + value = readw(isp_semaphore(ha)); + spin_unlock_irqrestore(&ha->hardware_lock, flags); + if ((value & (sem_mask >> 16)) == sem_bits) { + DEBUG2(printk("scsi%ld : Got SEM LOCK - mask= 0x%x, code = " + "0x%x, sema code=0x%x\n", ha->host_no, + sem_mask, sem_bits, value)); + return 1; + } + return 0; +} |