mirror of
https://github.com/AsahiLinux/m1n1
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148 lines
4.1 KiB
Python
Executable file
148 lines
4.1 KiB
Python
Executable file
#!/usr/bin/env python3
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# SPDX-License-Identifier: MIT
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import sys, pathlib
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import time
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sys.path.append(str(pathlib.Path(__file__).resolve().parents[1]))
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# speaker_amp.py -- play audio through the embedded speaker on Mac mini
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#
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# sample usage with sox:
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#
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# sox INPUT_FILE -t raw -r 48000 -c 1 -e signed-int -b 32 -L - gain -63 | python3 ./speaker_amp.py
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#
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# (expects mono, 24-bit signed samples padded to 32 bits on the msb side)
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import argparse
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from m1n1.setup import *
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from m1n1.hw.dart import DART, DARTRegs
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from m1n1.hw.i2c import I2C
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from m1n1.hw.pmgr import PMGR
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from m1n1.hw.nco import NCO
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from m1n1.hw.admac import *
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from m1n1.hw.mca import *
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argparser = argparse.ArgumentParser()
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argparser.add_argument("-f", "--file", "--input", "--samples",
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type=str, default=None,
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help='input filename to take samples from ' \
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'(default: standard input)')
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argparser.add_argument("-b", "--bufsize", type=int, default=1024*32,
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help='size of buffers to keep submitting to DMA')
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args = argparser.parse_args()
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inputf = open(args.file, "rb") if args.file is not None \
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else sys.stdin.buffer
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p.pmgr_adt_clocks_enable("/arm-io/i2c1")
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p.pmgr_adt_clocks_enable("/arm-io/admac-sio")
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p.pmgr_adt_clocks_enable("/arm-io/dart-sio")
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p.pmgr_adt_clocks_enable("/arm-io/mca-switch")
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# reset AUDIO_P
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PS_AUDIO_P = PMGR(u).regs[0].PS4[5]
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PS_AUDIO_P.set(DEV_DISABLE=1)
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PS_AUDIO_P.set(RESET=1)
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PS_AUDIO_P.set(RESET=0)
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PS_AUDIO_P.set(DEV_DISABLE=0)
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i2c1 = I2C(u, "/arm-io/i2c1")
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dart_base, _ = u.adt["/arm-io/dart-sio"].get_reg(0) # stream index 2
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dart = DART(iface, DARTRegs(u, dart_base), util=u)
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dart.initialize()
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cl_no = 0
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admac = ADMAC(u, "/arm-io/admac-sio", dart, debug=True)
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tx_chan = admac.chans[4*cl_no]
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tx_chan.disable()
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tx_chan.reset()
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tx_chan.read_reports() # read stale reports
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tx_chan.buswidth = E_BUSWIDTH.W_32BIT
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tx_chan.framesize = E_FRAME.F_1_WORD
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nco = NCO(u, "/arm-io/nco")
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nco[cl_no].set_rate(48000 * 256)
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nco[cl_no].enable()
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mca_switch1_base = u.adt["/arm-io/mca-switch"].get_reg(1)[0]
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mca_cl_base = u.adt["/arm-io/mca-switch"].get_reg(0)[0] + 0x4000*cl_no
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cl = MCACluster(u, mca_cl_base)
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regs, serdes = cl.regs, cl.txa
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regs.SYNCGEN_STATUS.set(RST=1, EN=0)
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regs.SYNCGEN_STATUS.set(RST=0)
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regs.SYNCGEN_MCLK_SEL.val =(1 + cl_no)
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regs.SYNCGEN_HI_PERIOD.val = 0
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regs.SYNCGEN_LO_PERIOD.val = 0xfe # full period minus two
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serdes.STATUS.set(EN=0)
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serdes.CONF.set(
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NSLOTS=0,
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SLOT_WIDTH=E_SLOT_WIDTH.W_32BIT,
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BCLK_POL=1,
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UNK1=1, UNK2=1,
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IDLE_UNDRIVEN=1,
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SYNC_SEL=(1 + cl_no)
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)
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serdes.BITDELAY.val = 0
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serdes.CHANMASK[0].val = 0xffff_fffe
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serdes.CHANMASK[1].val = 0xffff_fffe
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regs.PORT_ENABLES.set(CLOCK1=1, CLOCK2=1, DATA=1)
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regs.PORT_CLK_SEL.set(SEL=(cl_no + 1))
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regs.PORT_DATA_SEL.val = cl_no + 1
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regs.MCLK_STATUS.set(EN=1)
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regs.SYNCGEN_STATUS.set(EN=1)
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p.write32(mca_switch1_base + 0x8000*cl_no, 0x102048)
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# toggle the GPIO line driving the speaker-amp IC reset
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p.write32(0x23c1002d4, 0x76a02) # invoke reset
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p.write32(0x23c1002d4, 0x76a03) # take out of reset
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tx_chan.submit(inputf.read(args.bufsize))
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tx_chan.enable()
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while tx_chan.can_submit():
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tx_chan.submit(inputf.read(args.bufsize))
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serdes.STATUS.set(EN=1)
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# by ADT and leaked schematic, i2c1 contains TAS5770L,
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# which is not a public part. but there's e.g. TAS2770
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# with similar registers
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#
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# https://www.ti.com/product/TAS2770
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#
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# if the speaker-amp IC loses clock on the serial sample input,
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# it automatically switches to software shutdown.
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#
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i2c1.write_reg(0x31, 0x08, [0x40])
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i2c1.write_reg(0x31, 0x0a, [0x06, 0x00, 0x1a])
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i2c1.write_reg(0x31, 0x1b, [0x01, 0x82, 0x06])
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i2c1.write_reg(0x31, 0x16, [0x50, 0x04])
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i2c1.write_reg(0x31, 0x0d, [0x00])
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#i2c1.write_reg(0x31, 0x03, [0x14])
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# amplifier gain, presumably this is the lowest setting
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i2c1.write_reg(0x31, 0x03, [0x0])
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# take the IC out of software shutdown
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i2c1.write_reg(0x31, 0x02, [0x0c])
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while (buf := inputf.read(args.bufsize)):
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while not tx_chan.can_submit():
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tx_chan.poll()
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tx_chan.submit(buf)
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# mute
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i2c1.write_reg(0x31, 0x02, [0x0d])
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# software shutdown
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i2c1.write_reg(0x31, 0x02, [0x0e])
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tx_chan.disable()
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