/* * amdtp-tascam.c - a part of driver for TASCAM FireWire series * * Copyright (c) 2015 Takashi Sakamoto * * Licensed under the terms of the GNU General Public License, version 2. */ #include #include "tascam.h" #define AMDTP_FMT_TSCM_TX 0x1e #define AMDTP_FMT_TSCM_RX 0x3e struct amdtp_tscm { unsigned int pcm_channels; void (*transfer_samples)(struct amdtp_stream *s, struct snd_pcm_substream *pcm, __be32 *buffer, unsigned int frames); }; int amdtp_tscm_set_parameters(struct amdtp_stream *s, unsigned int rate) { struct amdtp_tscm *p = s->protocol; unsigned int data_channels; if (amdtp_stream_running(s)) return -EBUSY; data_channels = p->pcm_channels; /* Packets in in-stream have extra 2 data channels. */ if (s->direction == AMDTP_IN_STREAM) data_channels += 2; return amdtp_stream_set_parameters(s, rate, data_channels); } static void write_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm, __be32 *buffer, unsigned int frames) { struct amdtp_tscm *p = s->protocol; struct snd_pcm_runtime *runtime = pcm->runtime; unsigned int channels, remaining_frames, i, c; const u32 *src; channels = p->pcm_channels; src = (void *)runtime->dma_area + frames_to_bytes(runtime, s->pcm_buffer_pointer); remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; for (i = 0; i < frames; ++i) { for (c = 0; c < channels; ++c) { buffer[c] = cpu_to_be32(*src); src++; } buffer += s->data_block_quadlets; if (--remaining_frames == 0) src = (void *)runtime->dma_area; } } static void write_pcm_s16(struct amdtp_stream *s, struct snd_pcm_substream *pcm, __be32 *buffer, unsigned int frames) { struct amdtp_tscm *p = s->protocol; struct snd_pcm_runtime *runtime = pcm->runtime; unsigned int channels, remaining_frames, i, c; const u16 *src; channels = p->pcm_channels; src = (void *)runtime->dma_area + frames_to_bytes(runtime, s->pcm_buffer_pointer); remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; for (i = 0; i < frames; ++i) { for (c = 0; c < channels; ++c) { buffer[c] = cpu_to_be32(*src << 16); src++; } buffer += s->data_block_quadlets; if (--remaining_frames == 0) src = (void *)runtime->dma_area; } } static void read_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm, __be32 *buffer, unsigned int frames) { struct amdtp_tscm *p = s->protocol; struct snd_pcm_runtime *runtime = pcm->runtime; unsigned int channels, remaining_frames, i, c; u32 *dst; channels = p->pcm_channels; dst = (void *)runtime->dma_area + frames_to_bytes(runtime, s->pcm_buffer_pointer); remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; /* The first data channel is for event counter. */ buffer += 1; for (i = 0; i < frames; ++i) { for (c = 0; c < channels; ++c) { *dst = be32_to_cpu(buffer[c]); dst++; } buffer += s->data_block_quadlets; if (--remaining_frames == 0) dst = (void *)runtime->dma_area; } } static void write_pcm_silence(struct amdtp_stream *s, __be32 *buffer, unsigned int data_blocks) { struct amdtp_tscm *p = s->protocol; unsigned int channels, i, c; channels = p->pcm_channels; for (i = 0; i < data_blocks; ++i) { for (c = 0; c < channels; ++c) buffer[c] = 0x00000000; buffer += s->data_block_quadlets; } } int amdtp_tscm_add_pcm_hw_constraints(struct amdtp_stream *s, struct snd_pcm_runtime *runtime) { int err; /* * Our implementation allows this protocol to deliver 24 bit sample in * 32bit data channel. */ err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24); if (err < 0) return err; return amdtp_stream_add_pcm_hw_constraints(s, runtime); } void amdtp_tscm_set_pcm_format(struct amdtp_stream *s, snd_pcm_format_t format) { struct amdtp_tscm *p = s->protocol; if (WARN_ON(amdtp_stream_pcm_running(s))) return; switch (format) { default: WARN_ON(1); /* fall through */ case SNDRV_PCM_FORMAT_S16: if (s->direction == AMDTP_OUT_STREAM) { p->transfer_samples = write_pcm_s16; break; } WARN_ON(1); /* fall through */ case SNDRV_PCM_FORMAT_S32: if (s->direction == AMDTP_OUT_STREAM) p->transfer_samples = write_pcm_s32; else p->transfer_samples = read_pcm_s32; break; } } static unsigned int process_tx_data_blocks(struct amdtp_stream *s, __be32 *buffer, unsigned int data_blocks, unsigned int *syt) { struct amdtp_tscm *p = (struct amdtp_tscm *)s->protocol; struct snd_pcm_substream *pcm; pcm = ACCESS_ONCE(s->pcm); if (data_blocks > 0 && pcm) p->transfer_samples(s, pcm, buffer, data_blocks); /* A place holder for control messages. */ return data_blocks; } static unsigned int process_rx_data_blocks(struct amdtp_stream *s, __be32 *buffer, unsigned int data_blocks, unsigned int *syt) { struct amdtp_tscm *p = (struct amdtp_tscm *)s->protocol; struct snd_pcm_substream *pcm; /* This field is not used. */ *syt = 0x0000; pcm = ACCESS_ONCE(s->pcm); if (pcm) p->transfer_samples(s, pcm, buffer, data_blocks); else write_pcm_silence(s, buffer, data_blocks); return data_blocks; } int amdtp_tscm_init(struct amdtp_stream *s, struct fw_unit *unit, enum amdtp_stream_direction dir, unsigned int pcm_channels) { amdtp_stream_process_data_blocks_t process_data_blocks; struct amdtp_tscm *p; unsigned int fmt; int err; if (dir == AMDTP_IN_STREAM) { fmt = AMDTP_FMT_TSCM_TX; process_data_blocks = process_tx_data_blocks; } else { fmt = AMDTP_FMT_TSCM_RX; process_data_blocks = process_rx_data_blocks; } err = amdtp_stream_init(s, unit, dir, CIP_NONBLOCKING | CIP_SKIP_DBC_ZERO_CHECK, fmt, process_data_blocks, sizeof(struct amdtp_tscm)); if (err < 0) return 0; /* Use fixed value for FDF field. */ s->fdf = 0x00; /* This protocol uses fixed number of data channels for PCM samples. */ p = s->protocol; p->pcm_channels = pcm_channels; return 0; } 9b415c25e92&id2=bf29bddf0417a4783da3b24e8c9e017ac649326f'>diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/trace/events/mmflags.h')