275 lines
6.5 KiB
C
275 lines
6.5 KiB
C
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/*
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* STM32 ALSA SoC Digital Audio Interface (SAI) driver.
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*
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* Copyright (C) 2016, STMicroelectronics - All Rights Reserved
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* Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics.
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*
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* License terms: GPL V2.0.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*/
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#include <linux/bitfield.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/reset.h>
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#include <sound/dmaengine_pcm.h>
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#include <sound/core.h>
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#include "stm32_sai.h"
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static LIST_HEAD(sync_providers);
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static DEFINE_MUTEX(sync_mutex);
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struct sync_provider {
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struct list_head link;
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struct device_node *node;
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int (*sync_conf)(void *data, int synco);
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void *data;
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};
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static const struct stm32_sai_conf stm32_sai_conf_f4 = {
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.version = SAI_STM32F4,
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};
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static const struct stm32_sai_conf stm32_sai_conf_h7 = {
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.version = SAI_STM32H7,
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};
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static const struct of_device_id stm32_sai_ids[] = {
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{ .compatible = "st,stm32f4-sai", .data = (void *)&stm32_sai_conf_f4 },
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{ .compatible = "st,stm32h7-sai", .data = (void *)&stm32_sai_conf_h7 },
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{}
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};
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static int stm32_sai_sync_conf_client(struct stm32_sai_data *sai, int synci)
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{
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int ret;
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/* Enable peripheral clock to allow GCR register access */
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ret = clk_prepare_enable(sai->pclk);
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if (ret) {
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dev_err(&sai->pdev->dev, "failed to enable clock: %d\n", ret);
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return ret;
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}
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writel_relaxed(FIELD_PREP(SAI_GCR_SYNCIN_MASK, (synci - 1)), sai->base);
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clk_disable_unprepare(sai->pclk);
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return 0;
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}
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static int stm32_sai_sync_conf_provider(void *data, int synco)
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{
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struct stm32_sai_data *sai = (struct stm32_sai_data *)data;
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u32 prev_synco;
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int ret;
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/* Enable peripheral clock to allow GCR register access */
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ret = clk_prepare_enable(sai->pclk);
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if (ret) {
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dev_err(&sai->pdev->dev, "failed to enable clock: %d\n", ret);
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return ret;
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}
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dev_dbg(&sai->pdev->dev, "Set %s%s as synchro provider\n",
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sai->pdev->dev.of_node->name,
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synco == STM_SAI_SYNC_OUT_A ? "A" : "B");
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prev_synco = FIELD_GET(SAI_GCR_SYNCOUT_MASK, readl_relaxed(sai->base));
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if (prev_synco != STM_SAI_SYNC_OUT_NONE && synco != prev_synco) {
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dev_err(&sai->pdev->dev, "%s%s already set as sync provider\n",
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sai->pdev->dev.of_node->name,
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prev_synco == STM_SAI_SYNC_OUT_A ? "A" : "B");
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clk_disable_unprepare(sai->pclk);
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return -EINVAL;
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}
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writel_relaxed(FIELD_PREP(SAI_GCR_SYNCOUT_MASK, synco), sai->base);
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clk_disable_unprepare(sai->pclk);
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return 0;
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}
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static int stm32_sai_set_sync_provider(struct device_node *np, int synco)
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{
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struct sync_provider *provider;
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int ret;
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mutex_lock(&sync_mutex);
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list_for_each_entry(provider, &sync_providers, link) {
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if (provider->node == np) {
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ret = provider->sync_conf(provider->data, synco);
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mutex_unlock(&sync_mutex);
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return ret;
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}
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}
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mutex_unlock(&sync_mutex);
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/* SAI sync provider not found */
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return -ENODEV;
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}
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static int stm32_sai_set_sync(struct stm32_sai_data *sai,
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struct device_node *np_provider,
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int synco, int synci)
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{
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int ret;
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/* Configure sync client */
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stm32_sai_sync_conf_client(sai, synci);
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/* Configure sync provider */
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ret = stm32_sai_set_sync_provider(np_provider, synco);
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return ret;
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}
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static int stm32_sai_sync_add_provider(struct platform_device *pdev,
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void *data)
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{
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struct sync_provider *sp;
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sp = devm_kzalloc(&pdev->dev, sizeof(*sp), GFP_KERNEL);
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if (!sp)
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return -ENOMEM;
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sp->node = of_node_get(pdev->dev.of_node);
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sp->data = data;
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sp->sync_conf = &stm32_sai_sync_conf_provider;
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mutex_lock(&sync_mutex);
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list_add(&sp->link, &sync_providers);
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mutex_unlock(&sync_mutex);
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return 0;
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}
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static void stm32_sai_sync_del_provider(struct device_node *np)
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{
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struct sync_provider *sp;
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mutex_lock(&sync_mutex);
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list_for_each_entry(sp, &sync_providers, link) {
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if (sp->node == np) {
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list_del(&sp->link);
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of_node_put(sp->node);
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break;
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}
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}
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mutex_unlock(&sync_mutex);
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}
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static int stm32_sai_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct stm32_sai_data *sai;
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struct reset_control *rst;
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struct resource *res;
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const struct of_device_id *of_id;
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int ret;
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sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);
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if (!sai)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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sai->base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(sai->base))
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return PTR_ERR(sai->base);
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of_id = of_match_device(stm32_sai_ids, &pdev->dev);
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if (of_id)
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sai->conf = (struct stm32_sai_conf *)of_id->data;
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else
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return -EINVAL;
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if (!STM_SAI_IS_F4(sai)) {
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sai->pclk = devm_clk_get(&pdev->dev, "pclk");
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if (IS_ERR(sai->pclk)) {
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dev_err(&pdev->dev, "missing bus clock pclk\n");
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return PTR_ERR(sai->pclk);
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}
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}
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sai->clk_x8k = devm_clk_get(&pdev->dev, "x8k");
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if (IS_ERR(sai->clk_x8k)) {
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dev_err(&pdev->dev, "missing x8k parent clock\n");
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return PTR_ERR(sai->clk_x8k);
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}
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sai->clk_x11k = devm_clk_get(&pdev->dev, "x11k");
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if (IS_ERR(sai->clk_x11k)) {
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dev_err(&pdev->dev, "missing x11k parent clock\n");
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return PTR_ERR(sai->clk_x11k);
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}
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/* init irqs */
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sai->irq = platform_get_irq(pdev, 0);
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if (sai->irq < 0) {
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dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);
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return sai->irq;
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}
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/* reset */
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rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
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if (!IS_ERR(rst)) {
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reset_control_assert(rst);
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udelay(2);
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reset_control_deassert(rst);
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}
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ret = stm32_sai_sync_add_provider(pdev, sai);
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if (ret < 0)
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return ret;
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sai->set_sync = &stm32_sai_set_sync;
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sai->pdev = pdev;
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platform_set_drvdata(pdev, sai);
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ret = of_platform_populate(np, NULL, NULL, &pdev->dev);
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if (ret < 0)
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stm32_sai_sync_del_provider(np);
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return ret;
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}
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static int stm32_sai_remove(struct platform_device *pdev)
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{
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of_platform_depopulate(&pdev->dev);
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stm32_sai_sync_del_provider(pdev->dev.of_node);
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return 0;
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}
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MODULE_DEVICE_TABLE(of, stm32_sai_ids);
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static struct platform_driver stm32_sai_driver = {
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.driver = {
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.name = "st,stm32-sai",
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.of_match_table = stm32_sai_ids,
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},
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.probe = stm32_sai_probe,
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.remove = stm32_sai_remove,
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};
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module_platform_driver(stm32_sai_driver);
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MODULE_DESCRIPTION("STM32 Soc SAI Interface");
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MODULE_AUTHOR("Olivier Moysan <olivier.moysan@st.com>");
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MODULE_ALIAS("platform:st,stm32-sai");
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MODULE_LICENSE("GPL v2");
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