SKL and KBL rely on a dedicated HDAudio DMA stream for code loading and authentication. The implementation of this specific mechanism for SKL-based platforms re-uses HDAudio DMA (streaming) functions found in HDA library to avoid duplication of functionality.
Signed-off-by: Amadeusz Sławiński amadeuszx.slawinski@linux.intel.com Signed-off-by: Cezary Rojewski cezary.rojewski@intel.com --- sound/soc/intel/avs/Makefile | 1 + sound/soc/intel/avs/cldma.c | 328 ++++++++++++++++++++++++++++++++ sound/soc/intel/avs/cldma.h | 29 +++ sound/soc/intel/avs/registers.h | 2 + 4 files changed, 360 insertions(+) create mode 100644 sound/soc/intel/avs/cldma.c create mode 100644 sound/soc/intel/avs/cldma.h
diff --git a/sound/soc/intel/avs/Makefile b/sound/soc/intel/avs/Makefile index 31a51b08774d..53b14d901e2f 100644 --- a/sound/soc/intel/avs/Makefile +++ b/sound/soc/intel/avs/Makefile @@ -2,5 +2,6 @@
snd-soc-avs-objs := dsp.o ipc.o messages.o utils.o topology.o path.o \ core.o loader.o +snd-soc-avs-objs += cldma.o
obj-$(CONFIG_SND_SOC_INTEL_AVS) += snd-soc-avs.o diff --git a/sound/soc/intel/avs/cldma.c b/sound/soc/intel/avs/cldma.c new file mode 100644 index 000000000000..1ec2250e5323 --- /dev/null +++ b/sound/soc/intel/avs/cldma.c @@ -0,0 +1,328 @@ +// SPDX-License-Identifier: GPL-2.0-only +// +// Copyright(c) 2021 Intel Corporation. All rights reserved. +// +// Author: Cezary Rojewski cezary.rojewski@intel.com +// + +#include <linux/pci.h> +#include <sound/hda_register.h> +#include <sound/hdaudio_ext.h> +#include "cldma.h" +#include "registers.h" + +/* Stream Registers */ +#define AZX_CL_SD_BASE 0x80 +#define AZX_SD_CTL_STRM_MASK GENMASK(23, 20) +#define AZX_SD_CTL_STRM(s) \ + (((s)->stream_tag << 20) & AZX_SD_CTL_STRM_MASK) +#define AZX_SD_BDLPL_BDLPLBA_MASK GENMASK(31, 7) +#define AZX_SD_BDLPL_BDLPLBA(lb) ((lb) & AZX_SD_BDLPL_BDLPLBA_MASK) + +/* Software Position Based FIFO Capability Registers */ +#define AZX_CL_SPBFCS 0x20 +#define AZX_REG_CL_SPBFCTL (AZX_CL_SPBFCS + 0x4) +#define AZX_REG_CL_SD_SPIB (AZX_CL_SPBFCS + 0x8) + +#define AVS_CL_OP_INTERVAL_US 3 +#define AVS_CL_OP_TIMEOUT_US 300 +#define AVS_CL_IOC_TIMEOUT_MS 300 +#define AVS_CL_STREAM_INDEX 0 + +struct hda_cldma { + struct device *dev; + struct hdac_bus *bus; + void __iomem *adsp_ba; + + unsigned int buffer_size; + unsigned int num_periods; + unsigned int stream_tag; + void __iomem *sd_addr; + + struct snd_dma_buffer dmab_data; + struct snd_dma_buffer dmab_bdl; + struct delayed_work memcpy_work; + struct completion completion; + + /* runtime */ + void *position; + unsigned int remaining; + unsigned int sd_status; +}; + +static void cldma_memcpy_work(struct work_struct *work); + +struct hda_cldma code_loader = { + .stream_tag = AVS_CL_STREAM_INDEX + 1, + .memcpy_work = __DELAYED_WORK_INITIALIZER(code_loader.memcpy_work, + cldma_memcpy_work, 0), + .completion = COMPLETION_INITIALIZER(code_loader.completion), +}; + +void hda_cldma_fill(struct hda_cldma *cl) +{ + unsigned int size, offset; + + if (cl->remaining > cl->buffer_size) + size = cl->buffer_size; + else + size = cl->remaining; + + offset = snd_hdac_stream_readl(cl, CL_SD_SPIB); + if (offset + size > cl->buffer_size) { + unsigned int ss; + + ss = cl->buffer_size - offset; + memcpy(cl->dmab_data.area + offset, cl->position, ss); + offset = 0; + size -= ss; + cl->position += ss; + cl->remaining -= ss; + } + + memcpy(cl->dmab_data.area + offset, cl->position, size); + cl->position += size; + cl->remaining -= size; + + snd_hdac_stream_writel(cl, CL_SD_SPIB, offset + size); +} + +static void cldma_memcpy_work(struct work_struct *work) +{ + struct hda_cldma *cl = + container_of(work, struct hda_cldma, memcpy_work.work); + int ret; + + ret = hda_cldma_start(cl); + if (ret < 0) { + dev_err(cl->dev, "cldma set RUN failed: %d\n", ret); + return; + } + + while (true) { + ret = wait_for_completion_timeout(&cl->completion, + msecs_to_jiffies(AVS_CL_IOC_TIMEOUT_MS)); + if (!ret) { + dev_err(cl->dev, "cldma IOC timeout\n"); + break; + } + + if (!(cl->sd_status & SD_INT_COMPLETE)) { + dev_err(cl->dev, "cldma transfer error, SD status: 0x%08x\n", + cl->sd_status); + break; + } + + if (!cl->remaining) + break; + + reinit_completion(&cl->completion); + hda_cldma_fill(cl); + /* enable CLDMA interrupt */ + snd_hdac_adsp_updatel(cl, AVS_ADSP_REG_ADSPIC, + AVS_ADSP_ADSPIC_CLDMA, + AVS_ADSP_ADSPIC_CLDMA); + } +} + +void hda_cldma_transfer(struct hda_cldma *cl, unsigned long start_delay) +{ + if (!cl->remaining) + return; + + reinit_completion(&cl->completion); + /* fill buffer with the first chunk before scheduling run */ + hda_cldma_fill(cl); + + schedule_delayed_work(&cl->memcpy_work, start_delay); +} + +int hda_cldma_start(struct hda_cldma *cl) +{ + unsigned int reg; + + /* enable interrupts */ + snd_hdac_adsp_updatel(cl, AVS_ADSP_REG_ADSPIC, + AVS_ADSP_ADSPIC_CLDMA, AVS_ADSP_ADSPIC_CLDMA); + snd_hdac_stream_updateb(cl, SD_CTL, SD_INT_MASK | SD_CTL_DMA_START, + SD_INT_MASK | SD_CTL_DMA_START); + + /* await DMA engine start */ + return snd_hdac_stream_readb_poll(cl, SD_CTL, reg, + (reg & SD_CTL_DMA_START), + AVS_CL_OP_INTERVAL_US, AVS_CL_OP_TIMEOUT_US); +} + +int hda_cldma_stop(struct hda_cldma *cl) +{ + unsigned int reg; + int ret; + + /* disable interrupts */ + snd_hdac_adsp_updatel(cl, AVS_ADSP_REG_ADSPIC, + AVS_ADSP_ADSPIC_CLDMA, 0); + snd_hdac_stream_updateb(cl, SD_CTL, SD_INT_MASK | SD_CTL_DMA_START, 0); + + /* await DMA engine stop */ + ret = snd_hdac_stream_readb_poll(cl, SD_CTL, reg, + !(reg & SD_CTL_DMA_START), + AVS_CL_OP_INTERVAL_US, AVS_CL_OP_TIMEOUT_US); + cancel_delayed_work_sync(&cl->memcpy_work); + + return ret; +} + +int hda_cldma_reset(struct hda_cldma *cl) +{ + unsigned int reg; + int ret; + + ret = hda_cldma_stop(cl); + if (ret < 0) { + dev_err(cl->dev, "cldma stop failed: %d\n", ret); + return ret; + } + + snd_hdac_stream_updateb(cl, SD_CTL, 1, 1); + ret = snd_hdac_stream_readb_poll(cl, SD_CTL, reg, (reg & 1), + AVS_CL_OP_INTERVAL_US, AVS_CL_OP_TIMEOUT_US); + if (ret < 0) { + dev_err(cl->dev, "cldma set SRST failed: %d\n", ret); + return ret; + } + + snd_hdac_stream_updateb(cl, SD_CTL, 1, 0); + ret = snd_hdac_stream_readb_poll(cl, SD_CTL, reg, !(reg & 1), + AVS_CL_OP_INTERVAL_US, AVS_CL_OP_TIMEOUT_US); + if (ret < 0) { + dev_err(cl->dev, "cldma unset SRST failed: %d\n", ret); + return ret; + } + + return 0; +} + +void hda_cldma_set_data(struct hda_cldma *cl, void *data, unsigned int size) +{ + /* setup runtime */ + cl->position = data; + cl->remaining = size; +} + +static void cldma_setup_bdle(struct hda_cldma *cl, u32 bdle_size) +{ + struct snd_dma_buffer *dmab = &cl->dmab_data; + __le32 *bdl = (__le32 *)cl->dmab_bdl.area; + int remaining = cl->buffer_size; + int offset = 0; + + cl->num_periods = 0; + + while (remaining > 0) { + phys_addr_t addr; + int chunk; + + addr = snd_sgbuf_get_addr(dmab, offset); + bdl[0] = cpu_to_le32(lower_32_bits(addr)); + bdl[1] = cpu_to_le32(upper_32_bits(addr)); + chunk = snd_sgbuf_get_chunk_size(dmab, offset, bdle_size); + bdl[2] = cpu_to_le32(chunk); + + remaining -= chunk; + /* set IOC only for the last entry */ + bdl[3] = (remaining > 0) ? 0 : cpu_to_le32(0x01); + + bdl += 4; + offset += chunk; + cl->num_periods++; + } +} + +void hda_cldma_setup(struct hda_cldma *cl) +{ + dma_addr_t bdl_addr = cl->dmab_bdl.addr; + + cldma_setup_bdle(cl, cl->buffer_size / 2); + + snd_hdac_stream_writel(cl, SD_BDLPL, + AZX_SD_BDLPL_BDLPLBA(lower_32_bits(bdl_addr))); + snd_hdac_stream_writel(cl, SD_BDLPU, upper_32_bits(bdl_addr)); + + snd_hdac_stream_writel(cl, SD_CBL, cl->buffer_size); + snd_hdac_stream_writeb(cl, SD_LVI, cl->num_periods - 1); + + snd_hdac_stream_updatel(cl, SD_CTL, + AZX_SD_CTL_STRM_MASK, AZX_SD_CTL_STRM(cl)); + /* enable spib */ + snd_hdac_stream_writel(cl, CL_SPBFCTL, 1); +} + +static irqreturn_t cldma_irq_handler(int irq, void *dev_id) +{ + struct hda_cldma *cl = dev_id; + u32 adspis; + + adspis = snd_hdac_adsp_readl(cl, AVS_ADSP_REG_ADSPIS); + if (adspis == UINT_MAX) + return IRQ_NONE; + if (!(adspis & AVS_ADSP_ADSPIS_CLDMA)) + return IRQ_NONE; + + cl->sd_status = snd_hdac_stream_readb(cl, SD_STS); + dev_warn(cl->dev, "%s sd_status: 0x%08x\n", __func__, cl->sd_status); + + /* disable CLDMA interrupt */ + snd_hdac_adsp_updatel(cl, AVS_ADSP_REG_ADSPIC, + AVS_ADSP_ADSPIC_CLDMA, 0); + + complete(&cl->completion); + + return IRQ_HANDLED; +} + +int hda_cldma_init(struct hda_cldma *cl, struct hdac_bus *bus, + void __iomem *adsp_ba, unsigned int buffer_size) +{ + struct pci_dev *pci = to_pci_dev(bus->dev); + int ret; + + ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV_SG, bus->dev, + buffer_size, &cl->dmab_data); + if (ret < 0) + return ret; + + ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, bus->dev, + BDL_SIZE, &cl->dmab_bdl); + if (ret < 0) + goto alloc_err; + + cl->dev = bus->dev; + cl->bus = bus; + cl->adsp_ba = adsp_ba; + cl->buffer_size = buffer_size; + cl->sd_addr = adsp_ba + AZX_CL_SD_BASE; + + ret = pci_request_irq(pci, 0, cldma_irq_handler, NULL, cl, "CLDMA"); + if (ret < 0) { + dev_err(cl->dev, "Failed to request CLDMA IRQ handler: %d\n", ret); + goto req_err; + } + + return 0; + +req_err: + snd_dma_free_pages(&cl->dmab_bdl); +alloc_err: + snd_dma_free_pages(&cl->dmab_data); + + return ret; +} + +void hda_cldma_free(struct hda_cldma *cl) +{ + struct pci_dev *pci = to_pci_dev(cl->dev); + + pci_free_irq(pci, 0, cl); + snd_dma_free_pages(&cl->dmab_data); + snd_dma_free_pages(&cl->dmab_bdl); +} diff --git a/sound/soc/intel/avs/cldma.h b/sound/soc/intel/avs/cldma.h new file mode 100644 index 000000000000..d99a57061a43 --- /dev/null +++ b/sound/soc/intel/avs/cldma.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright(c) 2021 Intel Corporation. All rights reserved. + * + * Author: Cezary Rojewski cezary.rojewski@intel.com + */ + +#ifndef __SOUND_SOC_INTEL_AVS_CLDMA_H +#define __SOUND_SOC_INTEL_AVS_CLDMA_H + +#define AVS_CL_DEFAULT_BUFFER_SIZE (32 * PAGE_SIZE) + +struct hda_cldma; +extern struct hda_cldma code_loader; + +void hda_cldma_fill(struct hda_cldma *cl); +void hda_cldma_transfer(struct hda_cldma *cl, unsigned long start_delay); + +int hda_cldma_start(struct hda_cldma *cl); +int hda_cldma_stop(struct hda_cldma *cl); +int hda_cldma_reset(struct hda_cldma *cl); + +void hda_cldma_set_data(struct hda_cldma *cl, void *data, unsigned int size); +void hda_cldma_setup(struct hda_cldma *cl); +int hda_cldma_init(struct hda_cldma *cl, struct hdac_bus *bus, + void __iomem *adsp_ba, unsigned int buffer_size); +void hda_cldma_free(struct hda_cldma *cl); + +#endif diff --git a/sound/soc/intel/avs/registers.h b/sound/soc/intel/avs/registers.h index 4caa95aa3846..d607edd877d8 100644 --- a/sound/soc/intel/avs/registers.h +++ b/sound/soc/intel/avs/registers.h @@ -22,7 +22,9 @@ #define AVS_ADSP_REG_ADSPIS (AVS_ADSP_GEN_BASE + 0x0C)
#define AVS_ADSP_ADSPIC_IPC BIT(0) +#define AVS_ADSP_ADSPIC_CLDMA BIT(1) #define AVS_ADSP_ADSPIS_IPC BIT(0) +#define AVS_ADSP_ADSPIS_CLDMA BIT(1)
#define AVS_ADSPCS_CRST_MASK(cm) (cm) #define AVS_ADSPCS_CSTALL_MASK(cm) ((cm) << 8)