// SPDX-License-Identifier: GPL-2.0-only /* * Atmel SSC driver * * Copyright (C) 2007 Atmel Corporation */ #include <linux/platform_device.h> #include <linux/list.h> #include <linux/clk.h> #include <linux/err.h> #include <linux/io.h> #include <linux/spinlock.h> #include <linux/atmel-ssc.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/of.h> #include "../../sound/soc/atmel/atmel_ssc_dai.h" /* Serialize access to ssc_list and user count */ static DEFINE_SPINLOCK(user_lock); static LIST_HEAD(ssc_list); struct ssc_device *ssc_request(unsigned int ssc_num) { int ssc_valid = 0; struct ssc_device *ssc; spin_lock(&user_lock); list_for_each_entry(ssc, &ssc_list, list) { if (ssc->pdev->dev.of_node) { if (of_alias_get_id(ssc->pdev->dev.of_node, "ssc") == ssc_num) { ssc->pdev->id = ssc_num; ssc_valid = 1; break; } } else if (ssc->pdev->id == ssc_num) { ssc_valid = 1; break; } } if (!ssc_valid) { spin_unlock(&user_lock); pr_err("ssc: ssc%d platform device is missing\n", ssc_num); return ERR_PTR(-ENODEV); } if (ssc->user) { spin_unlock(&user_lock); dev_dbg(&ssc->pdev->dev, "module busy\n"); return ERR_PTR(-EBUSY); } ssc->user++; spin_unlock(&user_lock); clk_prepare(ssc->clk); return ssc; } EXPORT_SYMBOL(ssc_request); void ssc_free(struct ssc_device *ssc) { bool disable_clk = true; spin_lock(&user_lock); if (ssc->user) ssc->user--; else { disable_clk = false; dev_dbg(&ssc->pdev->dev, "device already free\n"); } spin_unlock(&user_lock); if (disable_clk) clk_unprepare(ssc->clk); } EXPORT_SYMBOL(ssc_free); static struct atmel_ssc_platform_data at91rm9200_config = { .use_dma = 0, .has_fslen_ext = 0, }; static struct atmel_ssc_platform_data at91sam9rl_config = { .use_dma = 0, .has_fslen_ext = 1, }; static struct atmel_ssc_platform_data at91sam9g45_config = { .use_dma = 1, .has_fslen_ext = 1, }; static const struct platform_device_id atmel_ssc_devtypes[] = { { .name = "at91rm9200_ssc", .driver_data = (unsigned long) &at91rm9200_config, }, { .name = "at91sam9rl_ssc", .driver_data = (unsigned long) &at91sam9rl_config, }, { .name = "at91sam9g45_ssc", .driver_data = (unsigned long) &at91sam9g45_config, }, { /* sentinel */ } }; #ifdef CONFIG_OF static const struct of_device_id atmel_ssc_dt_ids[] = { { .compatible = "atmel,at91rm9200-ssc", .data = &at91rm9200_config, }, { .compatible = "atmel,at91sam9rl-ssc", .data = &at91sam9rl_config, }, { .compatible = "atmel,at91sam9g45-ssc", .data = &at91sam9g45_config, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, atmel_ssc_dt_ids); #endif static inline const struct atmel_ssc_platform_data * atmel_ssc_get_driver_data(struct platform_device *pdev) { if (pdev->dev.of_node) { const struct of_device_id *match; match = of_match_node(atmel_ssc_dt_ids, pdev->dev.of_node); if (match == NULL) return NULL; return match->data; } return (struct atmel_ssc_platform_data *) platform_get_device_id(pdev)->driver_data; } #ifdef CONFIG_SND_ATMEL_SOC_SSC static int ssc_sound_dai_probe(struct ssc_device *ssc) { struct device_node *np = ssc->pdev->dev.of_node; int ret; int id; ssc->sound_dai = false; if (!of_property_read_bool(np, "#sound-dai-cells")) return 0; id = of_alias_get_id(np, "ssc"); if (id < 0) return id; ret = atmel_ssc_set_audio(id); ssc->sound_dai = !ret; return ret; } static void ssc_sound_dai_remove(struct ssc_device *ssc) { if (!ssc->sound_dai) return; atmel_ssc_put_audio(of_alias_get_id(ssc->pdev->dev.of_node, "ssc")); } #else static inline int ssc_sound_dai_probe(struct ssc_device *ssc) { if (of_property_read_bool(ssc->pdev->dev.of_node, "#sound-dai-cells")) return -ENOTSUPP; return 0; } static inline void ssc_sound_dai_remove(struct ssc_device *ssc) { } #endif static int ssc_probe(struct platform_device *pdev) { struct resource *regs; struct ssc_device *ssc; const struct atmel_ssc_platform_data *plat_dat; ssc = devm_kzalloc(&pdev->dev, sizeof(struct ssc_device), GFP_KERNEL); if (!ssc) { dev_dbg(&pdev->dev, "out of memory\n"); return -ENOMEM; } ssc->pdev = pdev; plat_dat = atmel_ssc_get_driver_data(pdev); if (!plat_dat) return -ENODEV; ssc->pdata = (struct atmel_ssc_platform_data *)plat_dat; if (pdev->dev.of_node) { struct device_node *np = pdev->dev.of_node; ssc->clk_from_rk_pin = of_property_read_bool(np, "atmel,clk-from-rk-pin"); } regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); ssc->regs = devm_ioremap_resource(&pdev->dev, regs); if (IS_ERR(ssc->regs)) return PTR_ERR(ssc->regs); ssc->phybase = regs->start; ssc->clk = devm_clk_get(&pdev->dev, "pclk"); if (IS_ERR(ssc->clk)) { dev_dbg(&pdev->dev, "no pclk clock defined\n"); return -ENXIO; } /* disable all interrupts */ clk_prepare_enable(ssc->clk); ssc_writel(ssc->regs, IDR, -1); ssc_readl(ssc->regs, SR); clk_disable_unprepare(ssc->clk); ssc->irq = platform_get_irq(pdev, 0); if (!ssc->irq) { dev_dbg(&pdev->dev, "could not get irq\n"); return -ENXIO; } spin_lock(&user_lock); list_add_tail(&ssc->list, &ssc_list); spin_unlock(&user_lock); platform_set_drvdata(pdev, ssc); dev_info(&pdev->dev, "Atmel SSC device at 0x%p (irq %d)\n", ssc->regs, ssc->irq); if (ssc_sound_dai_probe(ssc)) dev_err(&pdev->dev, "failed to auto-setup ssc for audio\n"); return 0; } static int ssc_remove(struct platform_device *pdev) { struct ssc_device *ssc = platform_get_drvdata(pdev); ssc_sound_dai_remove(ssc); spin_lock(&user_lock); list_del(&ssc->list); spin_unlock(&user_lock); return 0; } static struct platform_driver ssc_driver = { .driver = { .name = "ssc", .of_match_table = of_match_ptr(atmel_ssc_dt_ids), }, .id_table = atmel_ssc_devtypes, .probe = ssc_probe, .remove = ssc_remove, }; module_platform_driver(ssc_driver); MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>"); MODULE_DESCRIPTION("SSC driver for Atmel AVR32 and AT91"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:ssc");