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 193e086edfSolivier moysan #include <linux/clk.h> 203e086edfSolivier moysan #include <linux/delay.h> 213e086edfSolivier moysan #include <linux/module.h> 223e086edfSolivier moysan #include <linux/of_platform.h> 233e086edfSolivier moysan #include <linux/reset.h> 243e086edfSolivier moysan 253e086edfSolivier moysan #include <sound/dmaengine_pcm.h> 263e086edfSolivier moysan #include <sound/core.h> 273e086edfSolivier moysan 283e086edfSolivier moysan #include "stm32_sai.h" 293e086edfSolivier moysan 303e086edfSolivier moysan static const struct of_device_id stm32_sai_ids[] = { 313e086edfSolivier moysan { .compatible = "st,stm32f4-sai", .data = (void *)SAI_STM32F4 }, 323e086edfSolivier moysan {} 333e086edfSolivier moysan }; 343e086edfSolivier moysan 353e086edfSolivier moysan static int stm32_sai_probe(struct platform_device *pdev) 363e086edfSolivier moysan { 373e086edfSolivier moysan struct device_node *np = pdev->dev.of_node; 383e086edfSolivier moysan struct stm32_sai_data *sai; 393e086edfSolivier moysan struct reset_control *rst; 403e086edfSolivier moysan struct resource *res; 413e086edfSolivier moysan void __iomem *base; 423e086edfSolivier moysan const struct of_device_id *of_id; 433e086edfSolivier moysan 443e086edfSolivier moysan sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL); 453e086edfSolivier moysan if (!sai) 463e086edfSolivier moysan return -ENOMEM; 473e086edfSolivier moysan 483e086edfSolivier moysan res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 493e086edfSolivier moysan base = devm_ioremap_resource(&pdev->dev, res); 503e086edfSolivier moysan if (IS_ERR(base)) 513e086edfSolivier moysan return PTR_ERR(base); 523e086edfSolivier moysan 533e086edfSolivier moysan of_id = of_match_device(stm32_sai_ids, &pdev->dev); 543e086edfSolivier moysan if (of_id) 553e086edfSolivier moysan sai->version = (enum stm32_sai_version)of_id->data; 563e086edfSolivier moysan else 573e086edfSolivier moysan return -EINVAL; 583e086edfSolivier moysan 593e086edfSolivier moysan sai->clk_x8k = devm_clk_get(&pdev->dev, "x8k"); 603e086edfSolivier moysan if (IS_ERR(sai->clk_x8k)) { 613e086edfSolivier moysan dev_err(&pdev->dev, "missing x8k parent clock\n"); 623e086edfSolivier moysan return PTR_ERR(sai->clk_x8k); 633e086edfSolivier moysan } 643e086edfSolivier moysan 653e086edfSolivier moysan sai->clk_x11k = devm_clk_get(&pdev->dev, "x11k"); 663e086edfSolivier moysan if (IS_ERR(sai->clk_x11k)) { 673e086edfSolivier moysan dev_err(&pdev->dev, "missing x11k parent clock\n"); 683e086edfSolivier moysan return PTR_ERR(sai->clk_x11k); 693e086edfSolivier moysan } 703e086edfSolivier moysan 713e086edfSolivier moysan /* init irqs */ 723e086edfSolivier moysan sai->irq = platform_get_irq(pdev, 0); 733e086edfSolivier moysan if (sai->irq < 0) { 743e086edfSolivier moysan dev_err(&pdev->dev, "no irq for node %s\n", pdev->name); 753e086edfSolivier moysan return sai->irq; 763e086edfSolivier moysan } 773e086edfSolivier moysan 783e086edfSolivier moysan /* reset */ 793e086edfSolivier moysan rst = reset_control_get(&pdev->dev, NULL); 803e086edfSolivier moysan if (!IS_ERR(rst)) { 813e086edfSolivier moysan reset_control_assert(rst); 823e086edfSolivier moysan udelay(2); 833e086edfSolivier moysan reset_control_deassert(rst); 843e086edfSolivier moysan } 853e086edfSolivier moysan 863e086edfSolivier moysan sai->pdev = pdev; 873e086edfSolivier moysan platform_set_drvdata(pdev, sai); 883e086edfSolivier moysan 893e086edfSolivier moysan return of_platform_populate(np, NULL, NULL, &pdev->dev); 903e086edfSolivier moysan } 913e086edfSolivier moysan 923e086edfSolivier moysan static int stm32_sai_remove(struct platform_device *pdev) 933e086edfSolivier moysan { 943e086edfSolivier moysan of_platform_depopulate(&pdev->dev); 953e086edfSolivier moysan 963e086edfSolivier moysan return 0; 973e086edfSolivier moysan } 983e086edfSolivier moysan 993e086edfSolivier moysan MODULE_DEVICE_TABLE(of, stm32_sai_ids); 1003e086edfSolivier moysan 1013e086edfSolivier moysan static struct platform_driver stm32_sai_driver = { 1023e086edfSolivier moysan .driver = { 1033e086edfSolivier moysan .name = "st,stm32-sai", 1043e086edfSolivier moysan .of_match_table = stm32_sai_ids, 1053e086edfSolivier moysan }, 1063e086edfSolivier moysan .probe = stm32_sai_probe, 1073e086edfSolivier moysan .remove = stm32_sai_remove, 1083e086edfSolivier moysan }; 1093e086edfSolivier moysan 1103e086edfSolivier moysan module_platform_driver(stm32_sai_driver); 1113e086edfSolivier moysan 1123e086edfSolivier moysan MODULE_DESCRIPTION("STM32 Soc SAI Interface"); 1133e086edfSolivier moysan MODULE_AUTHOR("Olivier Moysan, <olivier.moysan@st.com>"); 1143e086edfSolivier moysan MODULE_ALIAS("platform:st,stm32-sai"); 1153e086edfSolivier moysan MODULE_LICENSE("GPL v2"); 116