drivers/scsi/qla4xxx/ql4_nvram.c

   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_qla4010(ha) ? FM93C66A_SIZE_16 : FM93C86A_SIZE_16;
  13 }
  14
  15 static inline int eeprom_no_addr_bits(struct scsi_qla_host *ha)
  16 {
  17         return is_qla4010(ha) ? FM93C56A_NO_ADDR_BITS_16 :
  18                 FM93C86A_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 }