mirror of
https://github.com/AsahiLinux/m1n1
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118 lines
3 KiB
Python
118 lines
3 KiB
Python
from setup import *
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import asm
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import struct
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base = 0x235010000
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# register defines from https://github.com/torvalds/linux/blob/master/drivers/i2c/busses/i2c-pasemi.c
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# Copyright (C) 2006-2007 PA Semi, Inc
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# SMBus host driver for PA Semi PWRficient
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REG_MTXFIFO = 0x00
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REG_MRXFIFO = 0x04
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REG_SMSTA = 0x14
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REG_CTL = 0x1c
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MTXFIFO_READ = 0x00000400
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MTXFIFO_STOP = 0x00000200
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MTXFIFO_START = 0x00000100
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MTXFIFO_DATA_M = 0x000000ff
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MRXFIFO_EMPTY = 0x00000100
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MRXFIFO_DATA_M = 0x000000ff
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SMSTA_XEN = 0x08000000
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SMSTA_MTN = 0x00200000
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CTL_MRR = 0x00000400
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CTL_MTR = 0x00000200
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CTL_CLK_M = 0x000000ff
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CLK_100K_DIV = 84
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CLK_400K_DIV = 21
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def i2c_read_reg(addr, reg, reg_size):
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p.set32(base + REG_CTL, CTL_MTR | CTL_MRR)
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p.write32(base + REG_SMSTA, 0xffffffff)
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p.write32(base + REG_MTXFIFO, MTXFIFO_START | (addr << 1))
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p.write32(base + REG_MTXFIFO, MTXFIFO_STOP | reg)
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while not (p.read32(base + REG_SMSTA) & SMSTA_XEN):
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pass
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p.write32(base + REG_MTXFIFO, MTXFIFO_START | (addr << 1) | 1)
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p.write32(base + REG_MTXFIFO, MTXFIFO_READ | MTXFIFO_STOP | reg_size + 1)
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res = []
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while len(res) < reg_size+1:
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v = p.read32(base + REG_MRXFIFO)
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if v & 0x100:
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continue
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res.append(v)
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if res[0] < reg_size:
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print("only read %d instead of %d bytes" % (res[0], reg_size))
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return res[1:]
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def i2c_write_reg(addr, reg, data):
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p.set32(base + REG_CTL, CTL_MTR | CTL_MRR)
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p.write32(base + REG_SMSTA, 0xffffffff)
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p.write32(base + REG_MTXFIFO, MTXFIFO_START | (addr << 1))
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p.write32(base + REG_MTXFIFO, reg)
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for i in range(len(data)-1):
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p.write32(base + REG_MTXFIFO, data[i])
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p.write32(base + REG_MTXFIFO, data[-1] | MTXFIFO_STOP)
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while not (p.read32(base + REG_SMSTA) & SMSTA_XEN):
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pass
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def i2c_read16(addr, reg):
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data = struct.pack(">2b", *i2c_read_reg(addr, reg, 2))
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return struct.unpack(">H", data)[0]
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def i2c_read32(addr, reg):
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data = struct.pack(">4b", *i2c_read_reg(addr, reg, 4))
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return struct.unpack(">I", data)[0]
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def tps6598x_exec_cmd(addr, cmd, data_in, out_len):
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if data_in:
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data = [len(data_in)] + data_in
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# TPS_REG_DATA1
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i2c_write_reg(addr, 0x09, data)
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# TPS_REG_CMD1
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cmd = [4] + list(map(ord, cmd))
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i2c_write_reg(addr, 0x08, cmd)
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# TPS_REG_CMD1
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v = i2c_read32(addr, 0x08)
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while v != 0:
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if v == 0x21434d44: # !CMD
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raise Exception("Invalid command!")
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v = i2c_read32(addr, 0x08)
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if not out_len:
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return
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# TPS_REG_DATA1
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return i2c_read_reg(addr, 0x09, out_len)
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print("make sure to run pmgr_adt_clocks_enable for /arm-io/i2c0 before this script.")
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# apple-specific command to bring the power state to zero
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# (or any other value specified as an argument)
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tps6598x_exec_cmd(0x3f, "SSPS", [0], 0)
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tps6598x_exec_cmd(0x38, "SSPS", [0], 0)
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tps6598x_exec_cmd(0x3f, "SWDF", None, 0)
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tps6598x_exec_cmd(0x3f, "SWSr", None, 0)
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tps6598x_exec_cmd(0x38, "SWDF", None, 0)
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tps6598x_exec_cmd(0x38, "SWSr", None, 0)
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