diff options
Diffstat (limited to 'target/linux/generic/files/crypto/ocf/kirkwood/mvHal/mv_hal/twsi/mvTwsiEeprom.S')
| -rw-r--r-- | target/linux/generic/files/crypto/ocf/kirkwood/mvHal/mv_hal/twsi/mvTwsiEeprom.S | 457 |
1 files changed, 457 insertions, 0 deletions
diff --git a/target/linux/generic/files/crypto/ocf/kirkwood/mvHal/mv_hal/twsi/mvTwsiEeprom.S b/target/linux/generic/files/crypto/ocf/kirkwood/mvHal/mv_hal/twsi/mvTwsiEeprom.S new file mode 100644 index 000000000..9d81ef2a6 --- /dev/null +++ b/target/linux/generic/files/crypto/ocf/kirkwood/mvHal/mv_hal/twsi/mvTwsiEeprom.S @@ -0,0 +1,457 @@ +/******************************************************************************* +Copyright (C) Marvell International Ltd. and its affiliates + +This software file (the "File") is owned and distributed by Marvell +International Ltd. and/or its affiliates ("Marvell") under the following +alternative licensing terms. Once you have made an election to distribute the +File under one of the following license alternatives, please (i) delete this +introductory statement regarding license alternatives, (ii) delete the two +license alternatives that you have not elected to use and (iii) preserve the +Marvell copyright notice above. + +******************************************************************************** +Marvell Commercial License Option + +If you received this File from Marvell and you have entered into a commercial +license agreement (a "Commercial License") with Marvell, the File is licensed +to you under the terms of the applicable Commercial License. + +******************************************************************************** +Marvell GPL License Option + +If you received this File from Marvell, you may opt to use, redistribute and/or +modify this File in accordance with the terms and conditions of the General +Public License Version 2, June 1991 (the "GPL License"), a copy of which is +available along with the File in the license.txt file or by writing to the Free +Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 or +on the worldwide web at http://www.gnu.org/licenses/gpl.txt. + +THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE IMPLIED +WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY +DISCLAIMED. The GPL License provides additional details about this warranty +disclaimer. +******************************************************************************** +Marvell BSD License Option + +If you received this File from Marvell, you may opt to use, redistribute and/or +modify this File under the following licensing terms. +Redistribution and use in source and binary forms, with or without modification, +are permitted provided that the following conditions are met: + + * Redistributions of source code must retain the above copyright notice, + this list of conditions and the following disclaimer. + + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + + * Neither the name of Marvell nor the names of its contributors may be + used to endorse or promote products derived from this software without + specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND +ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR +ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON +ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +*******************************************************************************/ + + +/* includes */ +#define MV_ASMLANGUAGE +#include "ctrlEnv/mvCtrlEnvSpec.h" +#include "boardEnv/mvBoardEnvSpec.h" +#include "mvOsAsm.h" +#include "mvTwsiSpec.h" +#include "mvSysHwConfig.h" +#include "ctrlEnv/sys/mvCpuIfRegs.h" +#include "mvCommon.h" + +#define I2C_CH MV_BOARD_DIMM_I2C_CHANNEL + +/* defines */ +/* defines */ + + + .data + .global _i2cInit + .global _i2cRead + + .text + +/******************************************************************************* +* _i2cInit - Initialize TWSI interface +* +* DESCRIPTION: +* The function performs TWSI interface initialization. It resets the +* TWSI state machine and initialize its clock to 100KHz assuming Tclock +* of 133MHz. +* +* INPUT: +* None. +* +* OUTPUT: +* None. +* +* RETURN: +* None. +* +*******************************************************************************/ +_i2cInit: + mov r9, LR /* Save link register */ + mov r0, #0 /* Make sure r0 is zero */ + + /* Reset the i2c Mechanism first */ + MV_REG_WRITE_ASM (r0, r1, TWSI_SOFT_RESET_REG(I2C_CH)) + + bl _twsiDelay + bl _twsiDelay + + /* Initializing the I2C mechanism. Assuming Tclock frequency */ + /* of 166MHz. The I2C frequency in that case will be 100KHz. */ + /* For this settings, M = 9 and N = 3. Set the baud-rate with the */ + /* value of 0x2b (freq of ==> 100KHz */ + /* see spec for more details about the calculation of this value) */ + mov r6, #(9 << 3 | 3) + MV_REG_WRITE_ASM (r6, r1, TWSI_STATUS_BAUDE_RATE_REG(I2C_CH)) + + /* Enable the I2C master */ + /* Enable TWSI interrupt in main mask reg */ + mov r6, #0xC4 + MV_REG_WRITE_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + + /* Let the slow TWSI machine get used to the idea that it is enabled */ + bl _twsiDelay + + + mov PC, r9 /* r9 is saved link register */ + +/******************************************************************************* +* _twsiDelay - Perform delay. +* +* DESCRIPTION: +* The function performs a delay to enable TWSI logic to stable. +* +* INPUT: +* None. +* +* OUTPUT: +* None. +* +* RETURN: +* None. +* +*******************************************************************************/ +_twsiDelay: + mov r10, #0x100000 /*was 0x400*/ + +_twsiDelayLoop: + subs r10, r10, #1 + bne _twsiDelayLoop + + mov PC, LR + +/******************************************************************************* +* _i2cRead - Read byte from I2C EEPROM device. +* +* DESCRIPTION: +* The function returns a byte from I2C EEPROM device. +* The EEPROM device is 7-bit address type. +* +* INPUT: +* r4 has the DIMM0 base address with shift 1 bit to the left +* r7 has the EEPROM offset +* +* OUTPUT: +* None. +* +* RETURN: +* r4 returns '0' if address can not be read. +* r7 has byte value in case read is successful. +* +*******************************************************************************/ +_i2cRead: + mov r9, LR /* Save link register */ + + /* Transmit the device address and desired offset within the EEPROM. */ + + /* Generate Start Bit */ + MV_REG_READ_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + orr r6, r6, #TWSI_CONTROL_START_BIT + MV_REG_WRITE_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + + /* Wait for the interrupt flag (bit3) to be set */ + mov r10, #0x50000 +loop_1: + subs r10, r10, #1 + beq loop_1_timeout +#ifdef MV78XX0 + MV_REG_READ_ASM (r6, r1, CPU_INT_LOW_REG(I2C_CH)) + tst r6, #BIT2 +#else + MV_REG_READ_ASM (r6, r1, CPU_MAIN_INT_CAUSE_REG) + tst r6, #BIT5 +#endif + beq loop_1 + +loop_1_timeout: + + /* Wait for the start bit to be reset by HW */ + mov r10, #0x50000 +loop_2: + subs r10, r10, #1 + beq loop_2_timeout + MV_REG_READ_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + tst r6, #TWSI_CONTROL_START_BIT + bne loop_2 + +loop_2_timeout: + + /* Wait for the status TWSI_START_CONDITION_TRA = 0x8 */ + mov r10, #0x50000 +loop_3: + subs r10, r10, #1 + beq loop_3_timeout + MV_REG_READ_ASM (r6, r1, TWSI_STATUS_BAUDE_RATE_REG(I2C_CH)) + cmp r6, #0x08 + bne loop_3 + +loop_3_timeout: + + /* writing the address of (DIMM0/1 << 1) with write indication */ + mov r6, r4, LSL #1 /* Write operation address bit 0 must be 0 */ + MV_REG_WRITE_ASM (r6, r1, TWSI_DATA_REG(I2C_CH)) + + bl _twsiDelay + /* Clear the interrupt flag */ + MV_REG_READ_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + bic r6, r6, #TWSI_CONTROL_INT_FLAG_SET + MV_REG_WRITE_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + bl _twsiDelay + + /* Waiting for the interrupt flag to be set which means that the + address has been transmitted */ +loop_4: +#ifdef MV78XX0 + MV_REG_READ_ASM (r6, r1, CPU_INT_LOW_REG(I2C_CH)) + tst r6, #BIT2 +#else + MV_REG_READ_ASM (r6, r1, CPU_MAIN_INT_CAUSE_REG) + tst r6, #BIT5 +#endif + beq loop_4 /* if tst = 0, then the bit is not set yet */ + + /* Wait for status TWSI_ADDR_PLUS_WRITE_BIT_TRA_ACK_REC = 0x18 */ + mov r10, #0x50000 /* Set r10 to 0x50000 =~ 328,000 */ + +loop_5: + subs r10, r10, #1 /* timeout count down */ + bne testStatus + mov r4, #0 /* r4 = 0 -> operation failed */ + b exit_i2cRead /* Exit if timeout (No DIMM) */ + +testStatus: + MV_REG_READ_ASM (r6, r1, TWSI_STATUS_BAUDE_RATE_REG(I2C_CH)) + cmp r6, #0x18 + bne loop_5 + + + /* check if the offset is bigger than 256 byte*/ + tst r7, #0x80000000 + bne great_than_256 + + /* Write the offset to be read from the DIMM EEPROM */ + MV_REG_WRITE_ASM (r7, r1, TWSI_DATA_REG(I2C_CH)) + + b after_offset + +great_than_256: + mov r10, r7, LSR #8 + and r10, r10, #0xff + /* Write the offset0 to be read from the EEPROM */ + MV_REG_WRITE_ASM (r10, r1, TWSI_DATA_REG(I2C_CH)) + + /* Clear the interrupt flag ==> signaling that the address can now + be transmited */ + + bl _twsiDelay + MV_REG_READ_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + bic r6, r6, #TWSI_CONTROL_INT_FLAG_SET + MV_REG_WRITE_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + bl _twsiDelay + + /* Wait for the interrupt to be set again ==> address has transmited */ +loop_6_1: +#ifdef MV78XX0 + MV_REG_READ_ASM (r6, r1, CPU_INT_LOW_REG(I2C_CH)) + tst r6, #BIT2 +#else + MV_REG_READ_ASM (r6, r1, CPU_MAIN_INT_CAUSE_REG) + tst r6, #BIT5 +#endif + beq loop_6_1 + + /* Wait for status TWSI_MAS_TRAN_DATA_BYTE_ACK_REC = 0x28 */ +loop_7_1: + MV_REG_READ_ASM (r6, r1, TWSI_STATUS_BAUDE_RATE_REG(I2C_CH)) + cmp r6, #0x28 + bne loop_7_1 + + + mov r10, r7 + and r10, r10, #0xff + /* Write the offset1 to be read from the EEPROM */ + MV_REG_WRITE_ASM (r10, r1, TWSI_DATA_REG(I2C_CH)) + + + +after_offset: + + /* Clear the interrupt flag ==> signaling that the address can now + be transmited */ + + bl _twsiDelay + MV_REG_READ_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + bic r6, r6, #TWSI_CONTROL_INT_FLAG_SET + MV_REG_WRITE_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + bl _twsiDelay + + /* Wait for the interrupt to be set again ==> address has transmited */ +loop_6: +#ifdef MV78XX0 + MV_REG_READ_ASM (r6, r1, CPU_INT_LOW_REG(I2C_CH)) + tst r6, #BIT2 +#else + MV_REG_READ_ASM (r6, r1, CPU_MAIN_INT_CAUSE_REG) + tst r6, #BIT5 +#endif + beq loop_6 + + /* Wait for status TWSI_MAS_TRAN_DATA_BYTE_ACK_REC = 0x28 */ +loop_7: + MV_REG_READ_ASM (r6, r1, TWSI_STATUS_BAUDE_RATE_REG(I2C_CH)) + cmp r6, #0x28 + bne loop_7 + + /* Retransmit the device address with read indication to get the data */ + + /* generate a repeated start bit */ + MV_REG_READ_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + orr r6, r6, #TWSI_CONTROL_START_BIT + MV_REG_WRITE_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + + + /* Clear the interrupt flag ==> the start bit will be transmitted. */ + bl _twsiDelay + MV_REG_READ_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + bic r6, r6, #TWSI_CONTROL_INT_FLAG_SET + MV_REG_WRITE_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + bl _twsiDelay + + /* Wait for the interrupt flag (bit3) to be set */ +loop_9: +#ifdef MV78XX0 + MV_REG_READ_ASM (r6, r1, CPU_INT_LOW_REG(I2C_CH)) + tst r6, #BIT2 +#else + MV_REG_READ_ASM (r6, r1, CPU_MAIN_INT_CAUSE_REG) + tst r6, #BIT5 +#endif + beq loop_9 + + /* Wait for the start bit to be reset by HW */ +loop_8: + MV_REG_READ_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + tst r6, #TWSI_CONTROL_START_BIT + bne loop_8 + + /* Wait for status TWSI_REPEATED_START_CONDITION_TRA = 0x10 */ +loop_10: + MV_REG_READ_ASM (r6, r1, TWSI_STATUS_BAUDE_RATE_REG(I2C_CH)) + cmp r6, #0x10 + bne loop_10 + + /* Writing the address of (DIMM0<<1) with read indication (bit0 is 1) */ + mov r6, r4, LSL #1 + orr r6, r6, #1 /* Read operation address bit 0 must be 1 */ + MV_REG_WRITE_ASM (r6, r1, TWSI_DATA_REG(I2C_CH)) + + /* Clear the interrupt flag ==> the address will be transmitted */ + bl _twsiDelay + MV_REG_READ_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + bic r6, r6, #TWSI_CONTROL_INT_FLAG_SET + MV_REG_WRITE_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + bl _twsiDelay + + /* Wait for the interrupt flag (bit3) to be set as a result of + transmitting the address. */ +loop_11: +#ifdef MV78XX0 + MV_REG_READ_ASM (r6, r1, CPU_INT_LOW_REG(I2C_CH)) + tst r6, #BIT2 +#else + MV_REG_READ_ASM (r6, r1, CPU_MAIN_INT_CAUSE_REG) + tst r6, #BIT5 +#endif + beq loop_11 + + /* Wait for status TWSI_ADDR_PLUS_READ_BIT_TRA_ACK_REC = 0x40 */ +loop_12: + MV_REG_READ_ASM (r6, r1, TWSI_STATUS_BAUDE_RATE_REG(I2C_CH)) + cmp r6, #0x40 + bne loop_12 + + /* Clear the interrupt flag and the Acknoledge bit */ + bl _twsiDelay + MV_REG_READ_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + bic r6, r6, #(TWSI_CONTROL_INT_FLAG_SET | TWSI_CONTROL_ACK) + MV_REG_WRITE_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + bl _twsiDelay + + /* Wait for the interrupt flag (bit3) to be set */ +loop_14: +#ifdef MV78XX0 + MV_REG_READ_ASM (r6, r1, CPU_INT_LOW_REG(I2C_CH)) + tst r6, #BIT2 +#else + MV_REG_READ_ASM (r6, r1, CPU_MAIN_INT_CAUSE_REG) + tst r6, #BIT5 +#endif + beq loop_14 + + /* Wait for status TWSI_MAS_REC_READ_DATA_ACK_NOT_TRA = 0x58 */ +loop_15: + MV_REG_READ_ASM (r6, r1, TWSI_STATUS_BAUDE_RATE_REG(I2C_CH)) + cmp r6, #0x58 + bne loop_15 + + /* Store the data in r7. */ + MV_REG_READ_ASM (r7, r1, TWSI_DATA_REG(I2C_CH)) + + /* Generate stop bit */ + MV_REG_READ_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + orr r6, r6, #TWSI_CONTROL_STOP_BIT + MV_REG_WRITE_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + + + /* Clear the interrupt flag */ + bl _twsiDelay + MV_REG_READ_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + bic r6, r6, #TWSI_CONTROL_INT_FLAG_SET + MV_REG_WRITE_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + bl _twsiDelay + + /* Wait for the stop bit to be reset by HW */ +loop_16: + MV_REG_READ_ASM (r6, r1, TWSI_CONTROL_REG(I2C_CH)) + tst r6, #TWSI_CONTROL_INT_FLAG_SET + bne loop_16 + +exit_i2cRead: + mov PC, r9 /* r9 is saved link register */ |