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 #include "ql4_glbl.h"
10 #include "ql4_dbg.h"
11 #include "ql4_inline.h"
12
13 static inline void eeprom_cmd(uint32_t cmd, struct scsi_qla_host *ha)
14 {
15 writel(cmd, isp_nvram(ha));
16 readl(isp_nvram(ha));
17 udelay(1);
18 }
19
20 static inline int eeprom_size(struct scsi_qla_host *ha)
21 {
22 return is_qla4010(ha) ? FM93C66A_SIZE_16 : FM93C86A_SIZE_16;
23 }
24
25 static inline int eeprom_no_addr_bits(struct scsi_qla_host *ha)
26 {
27 return is_qla4010(ha) ? FM93C56A_NO_ADDR_BITS_16 :
28 FM93C86A_NO_ADDR_BITS_16 ;
29 }
30
31 static inline int eeprom_no_data_bits(struct scsi_qla_host *ha)
32 {
33 return FM93C56A_DATA_BITS_16;
34 }
35
36 static int fm93c56a_select(struct scsi_qla_host * ha)
37 {
38 DEBUG5(printk(KERN_ERR "fm93c56a_select:\n"));
39
40 ha->eeprom_cmd_data = AUBURN_EEPROM_CS_1 | 0x000f0000;
41 eeprom_cmd(ha->eeprom_cmd_data, ha);
42 return 1;
43 }
44
45 static int fm93c56a_cmd(struct scsi_qla_host * ha, int cmd, int addr)
46 {
47 int i;
48 int mask;
49 int dataBit;
50 int previousBit;
51
52 /* Clock in a zero, then do the start bit. */
53 eeprom_cmd(ha->eeprom_cmd_data | AUBURN_EEPROM_DO_1, ha);
54
55 eeprom_cmd(ha->eeprom_cmd_data | AUBURN_EEPROM_DO_1 |
56 AUBURN_EEPROM_CLK_RISE, ha);
57 eeprom_cmd(ha->eeprom_cmd_data | AUBURN_EEPROM_DO_1 |
58 AUBURN_EEPROM_CLK_FALL, ha);
59
60 mask = 1 << (FM93C56A_CMD_BITS - 1);
61
62 /* Force the previous data bit to be different. */
63 previousBit = 0xffff;
64 for (i = 0; i < FM93C56A_CMD_BITS; i++) {
65 dataBit =
66 (cmd & mask) ? AUBURN_EEPROM_DO_1 : AUBURN_EEPROM_DO_0;
67 if (previousBit != dataBit) {
68
69 /*
70 * If the bit changed, then change the DO state to
71 * match.
72 */
73 eeprom_cmd(ha->eeprom_cmd_data | dataBit, ha);
74 previousBit = dataBit;
75 }
76 eeprom_cmd(ha->eeprom_cmd_data | dataBit |
77 AUBURN_EEPROM_CLK_RISE, ha);
78 eeprom_cmd(ha->eeprom_cmd_data | dataBit |
79 AUBURN_EEPROM_CLK_FALL, ha);
80
81 cmd = cmd << 1;
82 }
83 mask = 1 << (eeprom_no_addr_bits(ha) - 1);
84
85 /* Force the previous data bit to be different. */
86 previousBit = 0xffff;
87 for (i = 0; i < eeprom_no_addr_bits(ha); i++) {
88 dataBit = addr & mask ? AUBURN_EEPROM_DO_1 :
89 AUBURN_EEPROM_DO_0;
90 if (previousBit != dataBit) {
91 /*
92 * If the bit changed, then change the DO state to
93 * match.
94 */
95 eeprom_cmd(ha->eeprom_cmd_data | dataBit, ha);
96
97 previousBit = dataBit;
98 }
99 eeprom_cmd(ha->eeprom_cmd_data | dataBit |
100 AUBURN_EEPROM_CLK_RISE, ha);
101 eeprom_cmd(ha->eeprom_cmd_data | dataBit |
102 AUBURN_EEPROM_CLK_FALL, ha);
103
104 addr = addr << 1;
105 }
106 return 1;
107 }
108
109 static int fm93c56a_deselect(struct scsi_qla_host * ha)
110 {
111 ha->eeprom_cmd_data = AUBURN_EEPROM_CS_0 | 0x000f0000;
112 eeprom_cmd(ha->eeprom_cmd_data, ha);
113 return 1;
114 }
115
116 static int fm93c56a_datain(struct scsi_qla_host * ha, unsigned short *value)
117 {
118 int i;
119 int data = 0;
120 int dataBit;
121
122 /* Read the data bits
123 * The first bit is a dummy. Clock right over it. */
124 for (i = 0; i < eeprom_no_data_bits(ha); i++) {
125 eeprom_cmd(ha->eeprom_cmd_data |
126 AUBURN_EEPROM_CLK_RISE, ha);
127 eeprom_cmd(ha->eeprom_cmd_data |
128 AUBURN_EEPROM_CLK_FALL, ha);
129
130 dataBit = (readw(isp_nvram(ha)) & AUBURN_EEPROM_DI_1) ? 1 : 0;
131
132 data = (data << 1) | dataBit;
133 }
134
135 *value = data;
136 return 1;
137 }
138
139 static int eeprom_readword(int eepromAddr, u16 * value,
140 struct scsi_qla_host * ha)
141 {
142 fm93c56a_select(ha);
143 fm93c56a_cmd(ha, FM93C56A_READ, eepromAddr);
144 fm93c56a_datain(ha, value);
145 fm93c56a_deselect(ha);
146 return 1;
147 }
148
149 /* Hardware_lock must be set before calling */
150 u16 rd_nvram_word(struct scsi_qla_host * ha, int offset)
151 {
152 u16 val;
153
154 /* NOTE: NVRAM uses half-word addresses */
155 eeprom_readword(offset, &val, ha);
156 return val;
157 }
158
159 int qla4xxx_is_nvram_configuration_valid(struct scsi_qla_host * ha)
160 {
161 int status = QLA_ERROR;
162 uint16_t checksum = 0;
163 uint32_t index;
164 unsigned long flags;
165
166 spin_lock_irqsave(&ha->hardware_lock, flags);
167 for (index = 0; index < eeprom_size(ha); index++)
168 checksum += rd_nvram_word(ha, index);
169 spin_unlock_irqrestore(&ha->hardware_lock, flags);
170
171 if (checksum == 0)
172 status = QLA_SUCCESS;
173
174 return status;
175 }
176
177 /*************************************************************************
178 *
179 * Hardware Semaphore routines
180 *
181 *************************************************************************/
182 int ql4xxx_sem_spinlock(struct scsi_qla_host * ha, u32 sem_mask, u32 sem_bits)
183 {
184 uint32_t value;
185 unsigned long flags;
186 unsigned int seconds = 30;
187
188 DEBUG2(printk("scsi%ld : Trying to get SEM lock - mask= 0x%x, code = "
189 "0x%x\n", ha->host_no, sem_mask, sem_bits));
190 do {
191 spin_lock_irqsave(&ha->hardware_lock, flags);
192 writel((sem_mask | sem_bits), isp_semaphore(ha));
193 value = readw(isp_semaphore(ha));
194 spin_unlock_irqrestore(&ha->hardware_lock, flags);
195 if ((value & (sem_mask >> 16)) == sem_bits) {
196 DEBUG2(printk("scsi%ld : Got SEM LOCK - mask= 0x%x, "
197 "code = 0x%x\n", ha->host_no,
198 sem_mask, sem_bits));
199 return QLA_SUCCESS;
200 }
201 ssleep(1);
202 } while (--seconds);
203 return QLA_ERROR;
204 }
205
206 void ql4xxx_sem_unlock(struct scsi_qla_host * ha, u32 sem_mask)
207 {
208 unsigned long flags;
209
210 spin_lock_irqsave(&ha->hardware_lock, flags);
211 writel(sem_mask, isp_semaphore(ha));
212 readl(isp_semaphore(ha));
213 spin_unlock_irqrestore(&ha->hardware_lock, flags);
214
215 DEBUG2(printk("scsi%ld : UNLOCK SEM - mask= 0x%x\n", ha->host_no,
216 sem_mask));
217 }
218
219 int ql4xxx_sem_lock(struct scsi_qla_host * ha, u32 sem_mask, u32 sem_bits)
220 {
221 uint32_t value;
222 unsigned long flags;
223
224 spin_lock_irqsave(&ha->hardware_lock, flags);
225 writel((sem_mask | sem_bits), isp_semaphore(ha));
226 value = readw(isp_semaphore(ha));
227 spin_unlock_irqrestore(&ha->hardware_lock, flags);
228 if ((value & (sem_mask >> 16)) == sem_bits) {
229 DEBUG2(printk("scsi%ld : Got SEM LOCK - mask= 0x%x, code = "
230 "0x%x, sema code=0x%x\n", ha->host_no,
231 sem_mask, sem_bits, value));
232 return 1;
233 }
234 return 0;
235 }
236
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