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640 lines
7.0 KiB
640 lines
7.0 KiB
#define GPIO_DIR_HIGH (0x900000001fe00120) /* GPIO Direction Register */
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#define GPIO_DATA_HIGH (0x900000001fe0011c) /* GPIO Data Register */
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#define G_OUTPUT 0
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#define G_INPUT 1
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#define GPIO_SDA_DIR_SHIFT 1 /* GPIO1 used as SDA signal, R102 */
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#define GPIO_SCL_DIR_SHIFT 0 /* GPIO0 used as SCL signal, R94 */
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#define GPIO_SDA_DATA_SHIFT 1
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#define GPIO_SCL_DATA_SHIFT 0
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/*
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Just use t2,t4,t5,t6,t9, k0,k1,a0,a1,a2,a3,v0,v1
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*/
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/*
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* used to sleep some nop for ddr_frenquency,
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* here it can support 600M-1000M
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*/
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LEAF(_i2c_sleep)
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li t2,0x10
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sll a0,t2,a0
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1: nop
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subu a0,1
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bnez a0,1b
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nop
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jr ra
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nop
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END(_i2c_sleep)
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/*
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* used to set SDA signal output or input
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* input: a0, 0 means set gpio output, while 1 means input
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* used : a1,t2,v1
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* a1: store the SDA address
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* t2: store SDA value
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* v1: tmp value
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*/
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LEAF(_sda_dir)
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dli a1,GPIO_DIR_HIGH
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or a1, a1, k1
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lwu t2,0(a1)
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nop
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beqz a0,1f
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nop
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ori t2,t2,0x1<<GPIO_SDA_DIR_SHIFT //get the gpio1,for gpio used for i2c_sda
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nop
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b 2f
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nop
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1: li v1,~(0x1<<GPIO_SDA_DIR_SHIFT)
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and t2,t2,v1
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2: sw t2,0(a1)
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nop
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jr ra
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nop
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END(_sda_dir)
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/*
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* used to set SCL signal input or output
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* input: a0, 0 means set gpio output, while 1 means input
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* used : a1,t2,v1
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* a1: store the SCL address
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* t2: store SCL value
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* v1: tmp value
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*/
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LEAF(_scl_dir)
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dli a1,GPIO_DIR_HIGH
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or a1, a1, k1
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lwu t2,0(a1)
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nop
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beqz a0,1f
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nop
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ori t2,t2,0x1<<GPIO_SCL_DIR_SHIFT
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b 2f
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nop
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1: li v1,~(0x1<<GPIO_SCL_DIR_SHIFT)
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and t2,t2,v1
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2: sw t2,0(a1)
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nop
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jr ra
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nop
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END(_scl_dir)
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/*
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* used to set SDA signal high or low
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* input: a0, 0 means set gpio low, while 1 means high
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* used : a1,t2,k1,v1
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* a1: store the SDA address
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* t2: store SDA value
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* k1: store NODE_ID
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* v1: tmp value
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*/
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LEAF(_sda_bit)
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dli a1,GPIO_DATA_HIGH
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or a1, a1, k1
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lwu t2,0(a1)
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nop
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beqz a0,1f
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nop
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ori t2,t2,0x1<<GPIO_SDA_DATA_SHIFT
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b 2f
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nop
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1: li v1,~(0x1<<GPIO_SDA_DATA_SHIFT)
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and t2,t2,v1
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2: sw t2,0(a1)
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nop
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jr ra
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nop
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END(_sda_bit)
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/*
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* used to set SCL signal high or low
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* input: a0, 0 means set gpio low, while 1 means high
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* used : a1,t2,k1,v1
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* a1: store the SCL address
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* t2: store SCL value
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* k1: store NODE_ID
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* v1: tmp value
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*/
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LEAF(_scl_bit)
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dli a1,GPIO_DATA_HIGH
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or a1, a1, k1
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lwu t2,0(a1)
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nop
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beqz a0,1f
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nop
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ori t2,t2,0x1<<GPIO_SCL_DATA_SHIFT
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b 2f
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nop
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1: li v1,~(0x1<<GPIO_SCL_DATA_SHIFT)
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and t2,t2,v1
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2: sw t2,0(a1)
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nop
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jr ra
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nop
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END(_scl_bit)
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/*
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* start the i2c,SCL holds high level and SDA turn down from high
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* to low. And the matser is on OUTPUT module.
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*/
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LEAF(_i2c_start)
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move t5,ra
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li a0,G_OUTPUT
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bal _sda_dir
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nop
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li a0,G_OUTPUT
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bal _scl_dir
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nop
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li a0,0
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bal _scl_bit
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nop
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li a0,1
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bal _i2c_sleep
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nop
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li a0,1
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bal _sda_bit
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nop
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li a0,1
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bal _i2c_sleep
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nop
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li a0,1
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bal _scl_bit
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nop
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li a0,5
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bal _i2c_sleep
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nop
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li a0,0
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bal _sda_bit
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nop
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li a0,5
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bal _i2c_sleep
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nop
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li a0,0
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bal _scl_bit
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nop
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li a0,2
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bal _i2c_sleep
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nop
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jr t5
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nop
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END(_i2c_start)
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LEAF(_i2c_stop)
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move t5,ra
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li a0,G_OUTPUT
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bal _sda_dir
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nop
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li a0,G_OUTPUT
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bal _scl_dir
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nop
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li a0,0
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bal _scl_bit
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nop
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li a0,1
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bal _i2c_sleep
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nop
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li a0,0
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bal _sda_bit
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nop
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li a0,1
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bal _i2c_sleep
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nop
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li a0,1
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bal _scl_bit
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nop
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li a0,5
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bal _i2c_sleep
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nop
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li a0,1
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bal _sda_bit
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nop
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li a0,5
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bal _i2c_sleep
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nop
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li a0,0
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bal _scl_bit
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nop
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li a0,2
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bal _i2c_sleep
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nop
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jr t5
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nop
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END(_i2c_stop)
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LEAF(_i2c_send_ack)
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move t5,ra
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move t4,a0
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li a0,G_OUTPUT
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bal _sda_dir
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nop
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move a0,t4
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bal _sda_bit
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nop
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li a0,3
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bal _i2c_sleep
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nop
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li a0,1
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bal _scl_bit
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nop
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li a0,5
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bal _i2c_sleep
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nop
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li a0,0
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bal _scl_bit
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nop
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li a0,2
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bal _i2c_sleep
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nop
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jr t5
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nop
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END(_i2c_send_ack)
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LEAF(_i2c_rec_ack)
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move t5,ra
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li v0,1
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li t4,10
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li a0,G_INPUT
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bal _sda_dir
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nop
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li a0,3
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bal _i2c_sleep
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nop
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li a0,1
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bal _scl_bit
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nop
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li a0,5
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bal _i2c_sleep
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nop
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dli t9,GPIO_DATA_HIGH
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or t9, t9, k1
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lwu t9,0(t9)
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nop
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srl t9,t9,16
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andi t9,t9,0x1<<(GPIO_SDA_DATA_SHIFT)
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2: beqz t9,1f
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nop
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li a0,1
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bal _i2c_sleep
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nop
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subu t4,t4,1
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bnez t4,3f
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nop
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li v0,0
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b 1f
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nop
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3: dli t9,GPIO_DATA_HIGH
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or t9, t9, k1
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lwu t9,0(t9)
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nop
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srl t9,t9,16
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andi t9,t9,0x1<<(GPIO_SDA_DATA_SHIFT)
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b 2b
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nop
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1: li a0,0
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bal _scl_bit
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nop
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li a0,3
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bal _i2c_sleep
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nop
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jr t5
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nop
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END(_i2c_rec_ack)
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LEAF(_i2c_rec)
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move t5,ra
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li t9,0x7
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li v0,0
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li a0,G_INPUT
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bal _sda_dir
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nop
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2: bltz t9,1f
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nop
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li a0,5
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bal _i2c_sleep
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nop
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li a0,1
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bal _scl_bit
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nop
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li a0,3
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bal _i2c_sleep
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nop
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dli t4,GPIO_DATA_HIGH
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or t4, t4, k1
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lwu t4,0(t4)
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nop
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srl t4,t4,16
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andi t4,t4,0x1<<(GPIO_SDA_DATA_SHIFT)
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beqz t4,3f
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nop
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li t4,1
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3: sll t4,t4,t9
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or v0,v0,t4
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li a0,3
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bal _i2c_sleep
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nop
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li a0,0
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bal _scl_bit
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nop
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sub t9,t9,1
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b 2b
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nop
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1: jr t5
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nop
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END(_i2c_rec)
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LEAF(_i2c_send)
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move t5,ra
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move t4,a0
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li t9,0x7
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li a0,G_OUTPUT
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bal _sda_dir
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nop
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2: bltz t9,1f
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nop
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move a0,t4
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srl a0,a0,t9
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andi a0,a0,1
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bal _sda_bit
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nop
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li a0,1
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bal _i2c_sleep
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nop
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li a0,1
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bal _scl_bit
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nop
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li a0,5
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bal _i2c_sleep
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nop
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li a0,0
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bal _scl_bit
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nop
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li a0,1
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bal _i2c_sleep
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nop
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sub t9,t9,1
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b 2b
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nop
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1: li a0,1
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bal _sda_bit
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nop
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jr t5
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nop
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END(_i2c_send)
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/*
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a0,a2:slave device addr
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a1,a3:sub addr
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k1: NODE_ID
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v0:recieve data
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v1:show if sucess,0:sucess,1:failure
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here no use v1,for detect_dimm use many
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registers,so,I can`t have enough register
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to store sucess or failure.
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*/
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LEAF(i2cread)
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move t6,ra
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nop
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dsll k1,a2,44
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nop
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move a2,a0
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move a3,a1
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li v0,0
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// li v1,0
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bal _i2c_start
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nop
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andi a0, a2,0xfe
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bal _i2c_send
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nop
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bal _i2c_rec_ack
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nop
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move a0,a3
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bal _i2c_send
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nop
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bal _i2c_rec_ack
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nop
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bal _i2c_start
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nop
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move a0,a2
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bal _i2c_send
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nop
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bal _i2c_rec_ack
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nop
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bal _i2c_rec
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nop
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move k0,v0
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li a0,1
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bal _i2c_send_ack
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nop
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bal _i2c_stop
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nop
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// li v1,0
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move v0,k0
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move a0,a2
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b 2f
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nop
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//1: li v1,1
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2: jr t6
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nop
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END(i2cread)
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/*
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*a0: slave_addr
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*a1: sub_addr
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*a2: value
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*write is also good for i2c,
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*you can use it derectly in need.
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*/
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LEAF(i2cwrite)
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move t6,ra
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nop
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move a3,a0
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move a2,a1
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bal _i2c_start
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nop
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move a0,a3
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bal _i2c_send
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nop
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bal _i2c_rec_ack
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nop
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// beqz v0,1f
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// nop
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//move a0,a1
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move a0,a2
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bal _i2c_send
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nop
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bal _i2c_rec_ack
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nop
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// beqz v0,1f
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// nop
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move a0,a2
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bal _i2c_send
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nop
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bal _i2c_rec_ack
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nop
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// beqz v0,1f
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// nop
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bal _i2c_stop
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nop
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b 2f
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nop
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//1: li v1,1
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2: jr t6
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nop
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END(i2cwrite)
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/*
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* this function isn`t checked.
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* The correct of this function is not sure.
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*/
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LEAF(isl12027_watchdog)
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move t1,ra
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li a0,0xde
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li a1,0x3f
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li a2,0x2
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bal i2cwrite
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nop
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//PRINTSTR("setp1\r\n")
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li a0,0xde
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li a1,0x3f
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li a2,0x6
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bal i2cwrite
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nop
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//PRINTSTR("setp2\r\n")
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li a0,0xde
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li a1,0x14
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li a2,0x84
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bal i2cwrite
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nop
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//PRINTSTR("setp3\r\n")
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li a0,0xde
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li a1,0x3f
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li a2,0x2
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bal i2cwrite
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nop
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//PRINTSTR("setp1\r\n")
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li a0,0xde
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li a1,0x3f
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li a2,0x6
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bal i2cwrite
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nop
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//PRINTSTR("setp2\r\n")
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li a0,0xde
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li a1,0x10
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li a2,0x18
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bal i2cwrite
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nop
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//PRINTSTR("setp3\r\n")
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jr t1
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nop
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END(isl12027_watchdog)
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