David Somayajulu | afaf5a2 | 2006-09-19 10:28:00 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * QLogic iSCSI HBA Driver |
| 3 | * Copyright (c) 2003-2006 QLogic Corporation |
| 4 | * |
| 5 | * See LICENSE.qla4xxx for copyright and licensing details. |
| 6 | */ |
| 7 | |
| 8 | #include "ql4_def.h" |
| 9 | |
| 10 | static inline int eeprom_size(struct scsi_qla_host *ha) |
| 11 | { |
| 12 | return is_qla4022(ha) ? FM93C86A_SIZE_16 : FM93C66A_SIZE_16; |
| 13 | } |
| 14 | |
| 15 | static inline int eeprom_no_addr_bits(struct scsi_qla_host *ha) |
| 16 | { |
| 17 | return is_qla4022(ha) ? FM93C86A_NO_ADDR_BITS_16 : |
| 18 | FM93C56A_NO_ADDR_BITS_16; |
| 19 | } |
| 20 | |
| 21 | static inline int eeprom_no_data_bits(struct scsi_qla_host *ha) |
| 22 | { |
| 23 | return FM93C56A_DATA_BITS_16; |
| 24 | } |
| 25 | |
| 26 | static int fm93c56a_select(struct scsi_qla_host * ha) |
| 27 | { |
| 28 | DEBUG5(printk(KERN_ERR "fm93c56a_select:\n")); |
| 29 | |
| 30 | ha->eeprom_cmd_data = AUBURN_EEPROM_CS_1 | 0x000f0000; |
| 31 | writel(ha->eeprom_cmd_data, isp_nvram(ha)); |
| 32 | readl(isp_nvram(ha)); |
| 33 | return 1; |
| 34 | } |
| 35 | |
| 36 | static int fm93c56a_cmd(struct scsi_qla_host * ha, int cmd, int addr) |
| 37 | { |
| 38 | int i; |
| 39 | int mask; |
| 40 | int dataBit; |
| 41 | int previousBit; |
| 42 | |
| 43 | /* Clock in a zero, then do the start bit. */ |
| 44 | writel(ha->eeprom_cmd_data | AUBURN_EEPROM_DO_1, isp_nvram(ha)); |
| 45 | writel(ha->eeprom_cmd_data | AUBURN_EEPROM_DO_1 | |
| 46 | AUBURN_EEPROM_CLK_RISE, isp_nvram(ha)); |
| 47 | writel(ha->eeprom_cmd_data | AUBURN_EEPROM_DO_1 | |
| 48 | AUBURN_EEPROM_CLK_FALL, isp_nvram(ha)); |
| 49 | readl(isp_nvram(ha)); |
| 50 | mask = 1 << (FM93C56A_CMD_BITS - 1); |
| 51 | |
| 52 | /* Force the previous data bit to be different. */ |
| 53 | previousBit = 0xffff; |
| 54 | for (i = 0; i < FM93C56A_CMD_BITS; i++) { |
| 55 | dataBit = |
| 56 | (cmd & mask) ? AUBURN_EEPROM_DO_1 : AUBURN_EEPROM_DO_0; |
| 57 | if (previousBit != dataBit) { |
| 58 | |
| 59 | /* |
| 60 | * If the bit changed, then change the DO state to |
| 61 | * match. |
| 62 | */ |
| 63 | writel(ha->eeprom_cmd_data | dataBit, isp_nvram(ha)); |
| 64 | previousBit = dataBit; |
| 65 | } |
| 66 | writel(ha->eeprom_cmd_data | dataBit | |
| 67 | AUBURN_EEPROM_CLK_RISE, isp_nvram(ha)); |
| 68 | writel(ha->eeprom_cmd_data | dataBit | |
| 69 | AUBURN_EEPROM_CLK_FALL, isp_nvram(ha)); |
| 70 | readl(isp_nvram(ha)); |
| 71 | cmd = cmd << 1; |
| 72 | } |
| 73 | mask = 1 << (eeprom_no_addr_bits(ha) - 1); |
| 74 | |
| 75 | /* Force the previous data bit to be different. */ |
| 76 | previousBit = 0xffff; |
| 77 | for (i = 0; i < eeprom_no_addr_bits(ha); i++) { |
| 78 | dataBit = addr & mask ? AUBURN_EEPROM_DO_1 : |
| 79 | AUBURN_EEPROM_DO_0; |
| 80 | if (previousBit != dataBit) { |
| 81 | /* |
| 82 | * If the bit changed, then change the DO state to |
| 83 | * match. |
| 84 | */ |
| 85 | writel(ha->eeprom_cmd_data | dataBit, isp_nvram(ha)); |
| 86 | previousBit = dataBit; |
| 87 | } |
| 88 | writel(ha->eeprom_cmd_data | dataBit | |
| 89 | AUBURN_EEPROM_CLK_RISE, isp_nvram(ha)); |
| 90 | writel(ha->eeprom_cmd_data | dataBit | |
| 91 | AUBURN_EEPROM_CLK_FALL, isp_nvram(ha)); |
| 92 | readl(isp_nvram(ha)); |
| 93 | addr = addr << 1; |
| 94 | } |
| 95 | return 1; |
| 96 | } |
| 97 | |
| 98 | static int fm93c56a_deselect(struct scsi_qla_host * ha) |
| 99 | { |
| 100 | ha->eeprom_cmd_data = AUBURN_EEPROM_CS_0 | 0x000f0000; |
| 101 | writel(ha->eeprom_cmd_data, isp_nvram(ha)); |
| 102 | readl(isp_nvram(ha)); |
| 103 | return 1; |
| 104 | } |
| 105 | |
| 106 | static int fm93c56a_datain(struct scsi_qla_host * ha, unsigned short *value) |
| 107 | { |
| 108 | int i; |
| 109 | int data = 0; |
| 110 | int dataBit; |
| 111 | |
| 112 | /* Read the data bits |
| 113 | * The first bit is a dummy. Clock right over it. */ |
| 114 | for (i = 0; i < eeprom_no_data_bits(ha); i++) { |
| 115 | writel(ha->eeprom_cmd_data | |
| 116 | AUBURN_EEPROM_CLK_RISE, isp_nvram(ha)); |
| 117 | writel(ha->eeprom_cmd_data | |
| 118 | AUBURN_EEPROM_CLK_FALL, isp_nvram(ha)); |
| 119 | dataBit = |
| 120 | (readw(isp_nvram(ha)) & AUBURN_EEPROM_DI_1) ? 1 : 0; |
| 121 | data = (data << 1) | dataBit; |
| 122 | } |
| 123 | |
| 124 | *value = data; |
| 125 | return 1; |
| 126 | } |
| 127 | |
| 128 | static int eeprom_readword(int eepromAddr, u16 * value, |
| 129 | struct scsi_qla_host * ha) |
| 130 | { |
| 131 | fm93c56a_select(ha); |
| 132 | fm93c56a_cmd(ha, FM93C56A_READ, eepromAddr); |
| 133 | fm93c56a_datain(ha, value); |
| 134 | fm93c56a_deselect(ha); |
| 135 | return 1; |
| 136 | } |
| 137 | |
| 138 | /* Hardware_lock must be set before calling */ |
| 139 | u16 rd_nvram_word(struct scsi_qla_host * ha, int offset) |
| 140 | { |
| 141 | u16 val; |
| 142 | |
| 143 | /* NOTE: NVRAM uses half-word addresses */ |
| 144 | eeprom_readword(offset, &val, ha); |
| 145 | return val; |
| 146 | } |
| 147 | |
| 148 | int qla4xxx_is_nvram_configuration_valid(struct scsi_qla_host * ha) |
| 149 | { |
| 150 | int status = QLA_ERROR; |
| 151 | uint16_t checksum = 0; |
| 152 | uint32_t index; |
| 153 | unsigned long flags; |
| 154 | |
| 155 | spin_lock_irqsave(&ha->hardware_lock, flags); |
| 156 | for (index = 0; index < eeprom_size(ha); index++) |
| 157 | checksum += rd_nvram_word(ha, index); |
| 158 | spin_unlock_irqrestore(&ha->hardware_lock, flags); |
| 159 | |
| 160 | if (checksum == 0) |
| 161 | status = QLA_SUCCESS; |
| 162 | |
| 163 | return status; |
| 164 | } |
| 165 | |
| 166 | /************************************************************************* |
| 167 | * |
| 168 | * Hardware Semaphore routines |
| 169 | * |
| 170 | *************************************************************************/ |
| 171 | int ql4xxx_sem_spinlock(struct scsi_qla_host * ha, u32 sem_mask, u32 sem_bits) |
| 172 | { |
| 173 | uint32_t value; |
| 174 | unsigned long flags; |
| 175 | unsigned int seconds = 30; |
| 176 | |
| 177 | DEBUG2(printk("scsi%ld : Trying to get SEM lock - mask= 0x%x, code = " |
| 178 | "0x%x\n", ha->host_no, sem_mask, sem_bits)); |
| 179 | do { |
| 180 | spin_lock_irqsave(&ha->hardware_lock, flags); |
| 181 | writel((sem_mask | sem_bits), isp_semaphore(ha)); |
| 182 | value = readw(isp_semaphore(ha)); |
| 183 | spin_unlock_irqrestore(&ha->hardware_lock, flags); |
| 184 | if ((value & (sem_mask >> 16)) == sem_bits) { |
| 185 | DEBUG2(printk("scsi%ld : Got SEM LOCK - mask= 0x%x, " |
| 186 | "code = 0x%x\n", ha->host_no, |
| 187 | sem_mask, sem_bits)); |
| 188 | return QLA_SUCCESS; |
| 189 | } |
| 190 | ssleep(1); |
| 191 | } while (--seconds); |
| 192 | return QLA_ERROR; |
| 193 | } |
| 194 | |
| 195 | void ql4xxx_sem_unlock(struct scsi_qla_host * ha, u32 sem_mask) |
| 196 | { |
| 197 | unsigned long flags; |
| 198 | |
| 199 | spin_lock_irqsave(&ha->hardware_lock, flags); |
| 200 | writel(sem_mask, isp_semaphore(ha)); |
| 201 | readl(isp_semaphore(ha)); |
| 202 | spin_unlock_irqrestore(&ha->hardware_lock, flags); |
| 203 | |
| 204 | DEBUG2(printk("scsi%ld : UNLOCK SEM - mask= 0x%x\n", ha->host_no, |
| 205 | sem_mask)); |
| 206 | } |
| 207 | |
| 208 | int ql4xxx_sem_lock(struct scsi_qla_host * ha, u32 sem_mask, u32 sem_bits) |
| 209 | { |
| 210 | uint32_t value; |
| 211 | unsigned long flags; |
| 212 | |
| 213 | spin_lock_irqsave(&ha->hardware_lock, flags); |
| 214 | writel((sem_mask | sem_bits), isp_semaphore(ha)); |
| 215 | value = readw(isp_semaphore(ha)); |
| 216 | spin_unlock_irqrestore(&ha->hardware_lock, flags); |
| 217 | if ((value & (sem_mask >> 16)) == sem_bits) { |
| 218 | DEBUG2(printk("scsi%ld : Got SEM LOCK - mask= 0x%x, code = " |
| 219 | "0x%x, sema code=0x%x\n", ha->host_no, |
| 220 | sem_mask, sem_bits, value)); |
| 221 | return 1; |
| 222 | } |
| 223 | return 0; |
| 224 | } |