13e086edfSolivier moysan /* 23e086edfSolivier moysan * STM32 ALSA SoC Digital Audio Interface (SAI) driver. 33e086edfSolivier moysan * 43e086edfSolivier moysan * Copyright (C) 2016, STMicroelectronics - All Rights Reserved 53e086edfSolivier moysan * Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics. 63e086edfSolivier moysan * 73e086edfSolivier moysan * License terms: GPL V2.0. 83e086edfSolivier moysan * 93e086edfSolivier moysan * This program is free software; you can redistribute it and/or modify it 103e086edfSolivier moysan * under the terms of the GNU General Public License version 2 as published by 113e086edfSolivier moysan * the Free Software Foundation. 123e086edfSolivier moysan * 133e086edfSolivier moysan * This program is distributed in the hope that it will be useful, but 143e086edfSolivier moysan * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 153e086edfSolivier moysan * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 163e086edfSolivier moysan * details. 173e086edfSolivier moysan */ 183e086edfSolivier moysan 195914d285SOlivier Moysan #include <linux/bitfield.h> 203e086edfSolivier moysan #include <linux/clk.h> 213e086edfSolivier moysan #include <linux/delay.h> 223e086edfSolivier moysan #include <linux/module.h> 233e086edfSolivier moysan #include <linux/of_platform.h> 243e086edfSolivier moysan #include <linux/reset.h> 253e086edfSolivier moysan 263e086edfSolivier moysan #include <sound/dmaengine_pcm.h> 273e086edfSolivier moysan #include <sound/core.h> 283e086edfSolivier moysan 293e086edfSolivier moysan #include "stm32_sai.h" 303e086edfSolivier moysan 3103e78a24Solivier moysan static const struct stm32_sai_conf stm32_sai_conf_f4 = { 3203e78a24Solivier moysan .version = SAI_STM32F4, 336eb17d70SOlivier Moysan .has_spdif = false, 3403e78a24Solivier moysan }; 3503e78a24Solivier moysan 3603e78a24Solivier moysan static const struct stm32_sai_conf stm32_sai_conf_h7 = { 3703e78a24Solivier moysan .version = SAI_STM32H7, 386eb17d70SOlivier Moysan .has_spdif = true, 3903e78a24Solivier moysan }; 4003e78a24Solivier moysan 413e086edfSolivier moysan static const struct of_device_id stm32_sai_ids[] = { 4203e78a24Solivier moysan { .compatible = "st,stm32f4-sai", .data = (void *)&stm32_sai_conf_f4 }, 4303e78a24Solivier moysan { .compatible = "st,stm32h7-sai", .data = (void *)&stm32_sai_conf_h7 }, 443e086edfSolivier moysan {} 453e086edfSolivier moysan }; 463e086edfSolivier moysan 475914d285SOlivier Moysan static int stm32_sai_sync_conf_client(struct stm32_sai_data *sai, int synci) 485914d285SOlivier Moysan { 495914d285SOlivier Moysan int ret; 505914d285SOlivier Moysan 515914d285SOlivier Moysan /* Enable peripheral clock to allow GCR register access */ 525914d285SOlivier Moysan ret = clk_prepare_enable(sai->pclk); 535914d285SOlivier Moysan if (ret) { 545914d285SOlivier Moysan dev_err(&sai->pdev->dev, "failed to enable clock: %d\n", ret); 555914d285SOlivier Moysan return ret; 565914d285SOlivier Moysan } 575914d285SOlivier Moysan 585914d285SOlivier Moysan writel_relaxed(FIELD_PREP(SAI_GCR_SYNCIN_MASK, (synci - 1)), sai->base); 595914d285SOlivier Moysan 605914d285SOlivier Moysan clk_disable_unprepare(sai->pclk); 615914d285SOlivier Moysan 625914d285SOlivier Moysan return 0; 635914d285SOlivier Moysan } 645914d285SOlivier Moysan 657dd0d835Solivier moysan static int stm32_sai_sync_conf_provider(struct stm32_sai_data *sai, int synco) 665914d285SOlivier Moysan { 675914d285SOlivier Moysan u32 prev_synco; 685914d285SOlivier Moysan int ret; 695914d285SOlivier Moysan 705914d285SOlivier Moysan /* Enable peripheral clock to allow GCR register access */ 715914d285SOlivier Moysan ret = clk_prepare_enable(sai->pclk); 725914d285SOlivier Moysan if (ret) { 735914d285SOlivier Moysan dev_err(&sai->pdev->dev, "failed to enable clock: %d\n", ret); 745914d285SOlivier Moysan return ret; 755914d285SOlivier Moysan } 765914d285SOlivier Moysan 775914d285SOlivier Moysan dev_dbg(&sai->pdev->dev, "Set %s%s as synchro provider\n", 785914d285SOlivier Moysan sai->pdev->dev.of_node->name, 795914d285SOlivier Moysan synco == STM_SAI_SYNC_OUT_A ? "A" : "B"); 805914d285SOlivier Moysan 815914d285SOlivier Moysan prev_synco = FIELD_GET(SAI_GCR_SYNCOUT_MASK, readl_relaxed(sai->base)); 825914d285SOlivier Moysan if (prev_synco != STM_SAI_SYNC_OUT_NONE && synco != prev_synco) { 835914d285SOlivier Moysan dev_err(&sai->pdev->dev, "%s%s already set as sync provider\n", 845914d285SOlivier Moysan sai->pdev->dev.of_node->name, 855914d285SOlivier Moysan prev_synco == STM_SAI_SYNC_OUT_A ? "A" : "B"); 865914d285SOlivier Moysan clk_disable_unprepare(sai->pclk); 875914d285SOlivier Moysan return -EINVAL; 885914d285SOlivier Moysan } 895914d285SOlivier Moysan 905914d285SOlivier Moysan writel_relaxed(FIELD_PREP(SAI_GCR_SYNCOUT_MASK, synco), sai->base); 915914d285SOlivier Moysan 925914d285SOlivier Moysan clk_disable_unprepare(sai->pclk); 935914d285SOlivier Moysan 945914d285SOlivier Moysan return 0; 955914d285SOlivier Moysan } 965914d285SOlivier Moysan 977dd0d835Solivier moysan static int stm32_sai_set_sync(struct stm32_sai_data *sai_client, 985914d285SOlivier Moysan struct device_node *np_provider, 995914d285SOlivier Moysan int synco, int synci) 1005914d285SOlivier Moysan { 1017dd0d835Solivier moysan struct platform_device *pdev = of_find_device_by_node(np_provider); 1027dd0d835Solivier moysan struct stm32_sai_data *sai_provider; 1035914d285SOlivier Moysan int ret; 1045914d285SOlivier Moysan 1057dd0d835Solivier moysan if (!pdev) { 1067dd0d835Solivier moysan dev_err(&sai_client->pdev->dev, 1077dd0d835Solivier moysan "Device not found for node %s\n", np_provider->name); 1087dd0d835Solivier moysan return -ENODEV; 1097dd0d835Solivier moysan } 1107dd0d835Solivier moysan 1117dd0d835Solivier moysan sai_provider = platform_get_drvdata(pdev); 1127dd0d835Solivier moysan if (!sai_provider) { 1137dd0d835Solivier moysan dev_err(&sai_client->pdev->dev, 1147dd0d835Solivier moysan "SAI sync provider data not found\n"); 1157dd0d835Solivier moysan return -EINVAL; 1167dd0d835Solivier moysan } 1177dd0d835Solivier moysan 1185914d285SOlivier Moysan /* Configure sync client */ 1197dd0d835Solivier moysan ret = stm32_sai_sync_conf_client(sai_client, synci); 1207dd0d835Solivier moysan if (ret < 0) 1217dd0d835Solivier moysan return ret; 1225914d285SOlivier Moysan 1235914d285SOlivier Moysan /* Configure sync provider */ 1247dd0d835Solivier moysan return stm32_sai_sync_conf_provider(sai_provider, synco); 1255914d285SOlivier Moysan } 1265914d285SOlivier Moysan 1273e086edfSolivier moysan static int stm32_sai_probe(struct platform_device *pdev) 1283e086edfSolivier moysan { 1293e086edfSolivier moysan struct stm32_sai_data *sai; 1303e086edfSolivier moysan struct reset_control *rst; 1313e086edfSolivier moysan struct resource *res; 1323e086edfSolivier moysan const struct of_device_id *of_id; 1333e086edfSolivier moysan 1343e086edfSolivier moysan sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL); 1353e086edfSolivier moysan if (!sai) 1363e086edfSolivier moysan return -ENOMEM; 1373e086edfSolivier moysan 1383e086edfSolivier moysan res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1395914d285SOlivier Moysan sai->base = devm_ioremap_resource(&pdev->dev, res); 1405914d285SOlivier Moysan if (IS_ERR(sai->base)) 1415914d285SOlivier Moysan return PTR_ERR(sai->base); 1423e086edfSolivier moysan 1433e086edfSolivier moysan of_id = of_match_device(stm32_sai_ids, &pdev->dev); 1443e086edfSolivier moysan if (of_id) 14503e78a24Solivier moysan sai->conf = (struct stm32_sai_conf *)of_id->data; 1463e086edfSolivier moysan else 1473e086edfSolivier moysan return -EINVAL; 1483e086edfSolivier moysan 1495914d285SOlivier Moysan if (!STM_SAI_IS_F4(sai)) { 1505914d285SOlivier Moysan sai->pclk = devm_clk_get(&pdev->dev, "pclk"); 1515914d285SOlivier Moysan if (IS_ERR(sai->pclk)) { 1525914d285SOlivier Moysan dev_err(&pdev->dev, "missing bus clock pclk\n"); 1535914d285SOlivier Moysan return PTR_ERR(sai->pclk); 1545914d285SOlivier Moysan } 1555914d285SOlivier Moysan } 1565914d285SOlivier Moysan 1573e086edfSolivier moysan sai->clk_x8k = devm_clk_get(&pdev->dev, "x8k"); 1583e086edfSolivier moysan if (IS_ERR(sai->clk_x8k)) { 1593e086edfSolivier moysan dev_err(&pdev->dev, "missing x8k parent clock\n"); 1603e086edfSolivier moysan return PTR_ERR(sai->clk_x8k); 1613e086edfSolivier moysan } 1623e086edfSolivier moysan 1633e086edfSolivier moysan sai->clk_x11k = devm_clk_get(&pdev->dev, "x11k"); 1643e086edfSolivier moysan if (IS_ERR(sai->clk_x11k)) { 1653e086edfSolivier moysan dev_err(&pdev->dev, "missing x11k parent clock\n"); 1663e086edfSolivier moysan return PTR_ERR(sai->clk_x11k); 1673e086edfSolivier moysan } 1683e086edfSolivier moysan 1693e086edfSolivier moysan /* init irqs */ 1703e086edfSolivier moysan sai->irq = platform_get_irq(pdev, 0); 1713e086edfSolivier moysan if (sai->irq < 0) { 1723e086edfSolivier moysan dev_err(&pdev->dev, "no irq for node %s\n", pdev->name); 1733e086edfSolivier moysan return sai->irq; 1743e086edfSolivier moysan } 1753e086edfSolivier moysan 1763e086edfSolivier moysan /* reset */ 1773c6f6c53SOlivier Moysan rst = devm_reset_control_get_exclusive(&pdev->dev, NULL); 1783e086edfSolivier moysan if (!IS_ERR(rst)) { 1793e086edfSolivier moysan reset_control_assert(rst); 1803e086edfSolivier moysan udelay(2); 1813e086edfSolivier moysan reset_control_deassert(rst); 1823e086edfSolivier moysan } 1833e086edfSolivier moysan 1843e086edfSolivier moysan sai->pdev = pdev; 1857dd0d835Solivier moysan sai->set_sync = &stm32_sai_set_sync; 1863e086edfSolivier moysan platform_set_drvdata(pdev, sai); 1873e086edfSolivier moysan 188512d1bb4Solivier moysan return devm_of_platform_populate(&pdev->dev); 1893e086edfSolivier moysan } 1903e086edfSolivier moysan 1913e086edfSolivier moysan MODULE_DEVICE_TABLE(of, stm32_sai_ids); 1923e086edfSolivier moysan 1933e086edfSolivier moysan static struct platform_driver stm32_sai_driver = { 1943e086edfSolivier moysan .driver = { 1953e086edfSolivier moysan .name = "st,stm32-sai", 1963e086edfSolivier moysan .of_match_table = stm32_sai_ids, 1973e086edfSolivier moysan }, 1983e086edfSolivier moysan .probe = stm32_sai_probe, 1993e086edfSolivier moysan }; 2003e086edfSolivier moysan 2013e086edfSolivier moysan module_platform_driver(stm32_sai_driver); 2023e086edfSolivier moysan 2033e086edfSolivier moysan MODULE_DESCRIPTION("STM32 Soc SAI Interface"); 204602fdadcSolivier moysan MODULE_AUTHOR("Olivier Moysan <olivier.moysan@st.com>"); 2053e086edfSolivier moysan MODULE_ALIAS("platform:st,stm32-sai"); 2063e086edfSolivier moysan MODULE_LICENSE("GPL v2"); 207