11802d0beSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 23e086edfSolivier moysan /* 33e086edfSolivier moysan * STM32 ALSA SoC Digital Audio Interface (SAI) driver. 43e086edfSolivier moysan * 53e086edfSolivier moysan * Copyright (C) 2016, STMicroelectronics - All Rights Reserved 63e086edfSolivier moysan * Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics. 73e086edfSolivier moysan */ 83e086edfSolivier moysan 95914d285SOlivier Moysan #include <linux/bitfield.h> 103e086edfSolivier moysan #include <linux/clk.h> 113e086edfSolivier moysan #include <linux/delay.h> 123e086edfSolivier moysan #include <linux/module.h> 133e086edfSolivier moysan #include <linux/of_platform.h> 14cf881773SOlivier Moysan #include <linux/pinctrl/consumer.h> 153e086edfSolivier moysan #include <linux/reset.h> 163e086edfSolivier moysan 173e086edfSolivier moysan #include <sound/dmaengine_pcm.h> 183e086edfSolivier moysan #include <sound/core.h> 193e086edfSolivier moysan 203e086edfSolivier moysan #include "stm32_sai.h" 213e086edfSolivier moysan 2203e78a24Solivier moysan static const struct stm32_sai_conf stm32_sai_conf_f4 = { 2303e78a24Solivier moysan .version = SAI_STM32F4, 246eb17d70SOlivier Moysan .has_spdif = false, 2503e78a24Solivier moysan }; 2603e78a24Solivier moysan 2703e78a24Solivier moysan static const struct stm32_sai_conf stm32_sai_conf_h7 = { 2803e78a24Solivier moysan .version = SAI_STM32H7, 296eb17d70SOlivier Moysan .has_spdif = true, 3003e78a24Solivier moysan }; 3103e78a24Solivier moysan 323e086edfSolivier moysan static const struct of_device_id stm32_sai_ids[] = { 3303e78a24Solivier moysan { .compatible = "st,stm32f4-sai", .data = (void *)&stm32_sai_conf_f4 }, 3403e78a24Solivier moysan { .compatible = "st,stm32h7-sai", .data = (void *)&stm32_sai_conf_h7 }, 353e086edfSolivier moysan {} 363e086edfSolivier moysan }; 373e086edfSolivier moysan 38cf881773SOlivier Moysan static int stm32_sai_pclk_disable(struct device *dev) 395914d285SOlivier Moysan { 40cf881773SOlivier Moysan struct stm32_sai_data *sai = dev_get_drvdata(dev); 41cf881773SOlivier Moysan 42cf881773SOlivier Moysan clk_disable_unprepare(sai->pclk); 43cf881773SOlivier Moysan 44cf881773SOlivier Moysan return 0; 45cf881773SOlivier Moysan } 46cf881773SOlivier Moysan 47cf881773SOlivier Moysan static int stm32_sai_pclk_enable(struct device *dev) 48cf881773SOlivier Moysan { 49cf881773SOlivier Moysan struct stm32_sai_data *sai = dev_get_drvdata(dev); 505914d285SOlivier Moysan int ret; 515914d285SOlivier Moysan 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 58cf881773SOlivier Moysan return 0; 59cf881773SOlivier Moysan } 60cf881773SOlivier Moysan 61cf881773SOlivier Moysan static int stm32_sai_sync_conf_client(struct stm32_sai_data *sai, int synci) 62cf881773SOlivier Moysan { 63cf881773SOlivier Moysan int ret; 64cf881773SOlivier Moysan 65cf881773SOlivier Moysan /* Enable peripheral clock to allow GCR register access */ 66cf881773SOlivier Moysan ret = stm32_sai_pclk_enable(&sai->pdev->dev); 67cf881773SOlivier Moysan if (ret) 68cf881773SOlivier Moysan return ret; 69cf881773SOlivier Moysan 705914d285SOlivier Moysan writel_relaxed(FIELD_PREP(SAI_GCR_SYNCIN_MASK, (synci - 1)), sai->base); 715914d285SOlivier Moysan 72cf881773SOlivier Moysan stm32_sai_pclk_disable(&sai->pdev->dev); 735914d285SOlivier Moysan 745914d285SOlivier Moysan return 0; 755914d285SOlivier Moysan } 765914d285SOlivier Moysan 777dd0d835Solivier moysan static int stm32_sai_sync_conf_provider(struct stm32_sai_data *sai, int synco) 785914d285SOlivier Moysan { 795914d285SOlivier Moysan u32 prev_synco; 805914d285SOlivier Moysan int ret; 815914d285SOlivier Moysan 825914d285SOlivier Moysan /* Enable peripheral clock to allow GCR register access */ 83cf881773SOlivier Moysan ret = stm32_sai_pclk_enable(&sai->pdev->dev); 84cf881773SOlivier Moysan if (ret) 855914d285SOlivier Moysan return ret; 865914d285SOlivier Moysan 87dc43d3aaSRob Herring dev_dbg(&sai->pdev->dev, "Set %pOFn%s as synchro provider\n", 88dc43d3aaSRob Herring sai->pdev->dev.of_node, 895914d285SOlivier Moysan synco == STM_SAI_SYNC_OUT_A ? "A" : "B"); 905914d285SOlivier Moysan 915914d285SOlivier Moysan prev_synco = FIELD_GET(SAI_GCR_SYNCOUT_MASK, readl_relaxed(sai->base)); 925914d285SOlivier Moysan if (prev_synco != STM_SAI_SYNC_OUT_NONE && synco != prev_synco) { 93dc43d3aaSRob Herring dev_err(&sai->pdev->dev, "%pOFn%s already set as sync provider\n", 94dc43d3aaSRob Herring sai->pdev->dev.of_node, 955914d285SOlivier Moysan prev_synco == STM_SAI_SYNC_OUT_A ? "A" : "B"); 96cf881773SOlivier Moysan stm32_sai_pclk_disable(&sai->pdev->dev); 975914d285SOlivier Moysan return -EINVAL; 985914d285SOlivier Moysan } 995914d285SOlivier Moysan 1005914d285SOlivier Moysan writel_relaxed(FIELD_PREP(SAI_GCR_SYNCOUT_MASK, synco), sai->base); 1015914d285SOlivier Moysan 102cf881773SOlivier Moysan stm32_sai_pclk_disable(&sai->pdev->dev); 1035914d285SOlivier Moysan 1045914d285SOlivier Moysan return 0; 1055914d285SOlivier Moysan } 1065914d285SOlivier Moysan 1077dd0d835Solivier moysan static int stm32_sai_set_sync(struct stm32_sai_data *sai_client, 1085914d285SOlivier Moysan struct device_node *np_provider, 1095914d285SOlivier Moysan int synco, int synci) 1105914d285SOlivier Moysan { 1117dd0d835Solivier moysan struct platform_device *pdev = of_find_device_by_node(np_provider); 1127dd0d835Solivier moysan struct stm32_sai_data *sai_provider; 1135914d285SOlivier Moysan int ret; 1145914d285SOlivier Moysan 1157dd0d835Solivier moysan if (!pdev) { 1167dd0d835Solivier moysan dev_err(&sai_client->pdev->dev, 1175d585e1eSRob Herring "Device not found for node %pOFn\n", np_provider); 118d4180b4cSOlivier Moysan of_node_put(np_provider); 1197dd0d835Solivier moysan return -ENODEV; 1207dd0d835Solivier moysan } 1217dd0d835Solivier moysan 1227dd0d835Solivier moysan sai_provider = platform_get_drvdata(pdev); 1237dd0d835Solivier moysan if (!sai_provider) { 1247dd0d835Solivier moysan dev_err(&sai_client->pdev->dev, 1257dd0d835Solivier moysan "SAI sync provider data not found\n"); 1261c3816a1SWen Yang ret = -EINVAL; 127d4180b4cSOlivier Moysan goto error; 1287dd0d835Solivier moysan } 1297dd0d835Solivier moysan 1305914d285SOlivier Moysan /* Configure sync client */ 1317dd0d835Solivier moysan ret = stm32_sai_sync_conf_client(sai_client, synci); 1327dd0d835Solivier moysan if (ret < 0) 133d4180b4cSOlivier Moysan goto error; 1345914d285SOlivier Moysan 1355914d285SOlivier Moysan /* Configure sync provider */ 1361c3816a1SWen Yang ret = stm32_sai_sync_conf_provider(sai_provider, synco); 1371c3816a1SWen Yang 138d4180b4cSOlivier Moysan error: 1391c3816a1SWen Yang put_device(&pdev->dev); 140d4180b4cSOlivier Moysan of_node_put(np_provider); 1411c3816a1SWen Yang return ret; 1425914d285SOlivier Moysan } 1435914d285SOlivier Moysan 1443e086edfSolivier moysan static int stm32_sai_probe(struct platform_device *pdev) 1453e086edfSolivier moysan { 1463e086edfSolivier moysan struct stm32_sai_data *sai; 1473e086edfSolivier moysan struct reset_control *rst; 1483e086edfSolivier moysan struct resource *res; 1493e086edfSolivier moysan const struct of_device_id *of_id; 1503e086edfSolivier moysan 1513e086edfSolivier moysan sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL); 1523e086edfSolivier moysan if (!sai) 1533e086edfSolivier moysan return -ENOMEM; 1543e086edfSolivier moysan 1553e086edfSolivier moysan res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1565914d285SOlivier Moysan sai->base = devm_ioremap_resource(&pdev->dev, res); 1575914d285SOlivier Moysan if (IS_ERR(sai->base)) 1585914d285SOlivier Moysan return PTR_ERR(sai->base); 1593e086edfSolivier moysan 1603e086edfSolivier moysan of_id = of_match_device(stm32_sai_ids, &pdev->dev); 1613e086edfSolivier moysan if (of_id) 16203e78a24Solivier moysan sai->conf = (struct stm32_sai_conf *)of_id->data; 1633e086edfSolivier moysan else 1643e086edfSolivier moysan return -EINVAL; 1653e086edfSolivier moysan 1665914d285SOlivier Moysan if (!STM_SAI_IS_F4(sai)) { 1675914d285SOlivier Moysan sai->pclk = devm_clk_get(&pdev->dev, "pclk"); 1685914d285SOlivier Moysan if (IS_ERR(sai->pclk)) { 1695914d285SOlivier Moysan dev_err(&pdev->dev, "missing bus clock pclk\n"); 1705914d285SOlivier Moysan return PTR_ERR(sai->pclk); 1715914d285SOlivier Moysan } 1725914d285SOlivier Moysan } 1735914d285SOlivier Moysan 1743e086edfSolivier moysan sai->clk_x8k = devm_clk_get(&pdev->dev, "x8k"); 1753e086edfSolivier moysan if (IS_ERR(sai->clk_x8k)) { 1763e086edfSolivier moysan dev_err(&pdev->dev, "missing x8k parent clock\n"); 1773e086edfSolivier moysan return PTR_ERR(sai->clk_x8k); 1783e086edfSolivier moysan } 1793e086edfSolivier moysan 1803e086edfSolivier moysan sai->clk_x11k = devm_clk_get(&pdev->dev, "x11k"); 1813e086edfSolivier moysan if (IS_ERR(sai->clk_x11k)) { 1823e086edfSolivier moysan dev_err(&pdev->dev, "missing x11k parent clock\n"); 1833e086edfSolivier moysan return PTR_ERR(sai->clk_x11k); 1843e086edfSolivier moysan } 1853e086edfSolivier moysan 1863e086edfSolivier moysan /* init irqs */ 1873e086edfSolivier moysan sai->irq = platform_get_irq(pdev, 0); 1883e086edfSolivier moysan if (sai->irq < 0) { 1893e086edfSolivier moysan dev_err(&pdev->dev, "no irq for node %s\n", pdev->name); 1903e086edfSolivier moysan return sai->irq; 1913e086edfSolivier moysan } 1923e086edfSolivier moysan 1933e086edfSolivier moysan /* reset */ 1943c6f6c53SOlivier Moysan rst = devm_reset_control_get_exclusive(&pdev->dev, NULL); 1953e086edfSolivier moysan if (!IS_ERR(rst)) { 1963e086edfSolivier moysan reset_control_assert(rst); 1973e086edfSolivier moysan udelay(2); 1983e086edfSolivier moysan reset_control_deassert(rst); 1993e086edfSolivier moysan } 2003e086edfSolivier moysan 2013e086edfSolivier moysan sai->pdev = pdev; 2027dd0d835Solivier moysan sai->set_sync = &stm32_sai_set_sync; 2033e086edfSolivier moysan platform_set_drvdata(pdev, sai); 2043e086edfSolivier moysan 205512d1bb4Solivier moysan return devm_of_platform_populate(&pdev->dev); 2063e086edfSolivier moysan } 2073e086edfSolivier moysan 208cf881773SOlivier Moysan #ifdef CONFIG_PM_SLEEP 209cf881773SOlivier Moysan /* 210cf881773SOlivier Moysan * When pins are shared by two sai sub instances, pins have to be defined 211cf881773SOlivier Moysan * in sai parent node. In this case, pins state is not managed by alsa fw. 212cf881773SOlivier Moysan * These pins are managed in suspend/resume callbacks. 213cf881773SOlivier Moysan */ 214cf881773SOlivier Moysan static int stm32_sai_suspend(struct device *dev) 215cf881773SOlivier Moysan { 216cf881773SOlivier Moysan struct stm32_sai_data *sai = dev_get_drvdata(dev); 217cf881773SOlivier Moysan int ret; 218cf881773SOlivier Moysan 219cf881773SOlivier Moysan ret = stm32_sai_pclk_enable(dev); 220cf881773SOlivier Moysan if (ret) 221cf881773SOlivier Moysan return ret; 222cf881773SOlivier Moysan 223cf881773SOlivier Moysan sai->gcr = readl_relaxed(sai->base); 224cf881773SOlivier Moysan stm32_sai_pclk_disable(dev); 225cf881773SOlivier Moysan 226cf881773SOlivier Moysan return pinctrl_pm_select_sleep_state(dev); 227cf881773SOlivier Moysan } 228cf881773SOlivier Moysan 229cf881773SOlivier Moysan static int stm32_sai_resume(struct device *dev) 230cf881773SOlivier Moysan { 231cf881773SOlivier Moysan struct stm32_sai_data *sai = dev_get_drvdata(dev); 232cf881773SOlivier Moysan int ret; 233cf881773SOlivier Moysan 234cf881773SOlivier Moysan ret = stm32_sai_pclk_enable(dev); 235cf881773SOlivier Moysan if (ret) 236cf881773SOlivier Moysan return ret; 237cf881773SOlivier Moysan 238cf881773SOlivier Moysan writel_relaxed(sai->gcr, sai->base); 239cf881773SOlivier Moysan stm32_sai_pclk_disable(dev); 240cf881773SOlivier Moysan 241cf881773SOlivier Moysan return pinctrl_pm_select_default_state(dev); 242cf881773SOlivier Moysan } 243cf881773SOlivier Moysan #endif /* CONFIG_PM_SLEEP */ 244cf881773SOlivier Moysan 245cf881773SOlivier Moysan static const struct dev_pm_ops stm32_sai_pm_ops = { 246cf881773SOlivier Moysan SET_SYSTEM_SLEEP_PM_OPS(stm32_sai_suspend, stm32_sai_resume) 247cf881773SOlivier Moysan }; 248cf881773SOlivier Moysan 2493e086edfSolivier moysan MODULE_DEVICE_TABLE(of, stm32_sai_ids); 2503e086edfSolivier moysan 2513e086edfSolivier moysan static struct platform_driver stm32_sai_driver = { 2523e086edfSolivier moysan .driver = { 2533e086edfSolivier moysan .name = "st,stm32-sai", 2543e086edfSolivier moysan .of_match_table = stm32_sai_ids, 255cf881773SOlivier Moysan .pm = &stm32_sai_pm_ops, 2563e086edfSolivier moysan }, 2573e086edfSolivier moysan .probe = stm32_sai_probe, 2583e086edfSolivier moysan }; 2593e086edfSolivier moysan 2603e086edfSolivier moysan module_platform_driver(stm32_sai_driver); 2613e086edfSolivier moysan 2623e086edfSolivier moysan MODULE_DESCRIPTION("STM32 Soc SAI Interface"); 263602fdadcSolivier moysan MODULE_AUTHOR("Olivier Moysan <olivier.moysan@st.com>"); 2643e086edfSolivier moysan MODULE_ALIAS("platform:st,stm32-sai"); 2653e086edfSolivier moysan MODULE_LICENSE("GPL v2"); 266