147bbcbfeSAndra Danciu // SPDX-License-Identifier: GPL-2.0+ 247bbcbfeSAndra Danciu // 347bbcbfeSAndra Danciu // Copyright 2012 Freescale Semiconductor, Inc. 447bbcbfeSAndra Danciu // Copyright 2012 Linaro Ltd. 547bbcbfeSAndra Danciu // Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de> 647bbcbfeSAndra Danciu // 747bbcbfeSAndra Danciu // Initial development of this code was funded by 81ce8f643SAlexander A. Klimov // Phytec Messtechnik GmbH, https://www.phytec.de 9a23dc694SShawn Guo 10a23dc694SShawn Guo #include <linux/clk.h> 11a23dc694SShawn Guo #include <linux/debugfs.h> 12a23dc694SShawn Guo #include <linux/err.h> 13a23dc694SShawn Guo #include <linux/io.h> 14a23dc694SShawn Guo #include <linux/module.h> 15a23dc694SShawn Guo #include <linux/of.h> 16a23dc694SShawn Guo #include <linux/platform_device.h> 17a23dc694SShawn Guo #include <linux/slab.h> 18a23dc694SShawn Guo 19a23dc694SShawn Guo #include "imx-audmux.h" 20a23dc694SShawn Guo 21a23dc694SShawn Guo #define DRIVER_NAME "imx-audmux" 22a23dc694SShawn Guo 23a23dc694SShawn Guo static struct clk *audmux_clk; 24a23dc694SShawn Guo static void __iomem *audmux_base; 258661ab5bSShengjiu Wang static u32 *regcache; 268661ab5bSShengjiu Wang static u32 reg_max; 27a23dc694SShawn Guo 28a23dc694SShawn Guo #define IMX_AUDMUX_V2_PTCR(x) ((x) * 8) 29a23dc694SShawn Guo #define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4) 30a23dc694SShawn Guo 31a23dc694SShawn Guo #ifdef CONFIG_DEBUG_FS 32a23dc694SShawn Guo static struct dentry *audmux_debugfs_root; 33a23dc694SShawn Guo 34a23dc694SShawn Guo /* There is an annoying discontinuity in the SSI numbering with regard 35a23dc694SShawn Guo * to the Linux number of the devices */ 36a23dc694SShawn Guo static const char *audmux_port_string(int port) 37a23dc694SShawn Guo { 38a23dc694SShawn Guo switch (port) { 39a23dc694SShawn Guo case MX31_AUDMUX_PORT1_SSI0: 40a23dc694SShawn Guo return "imx-ssi.0"; 41a23dc694SShawn Guo case MX31_AUDMUX_PORT2_SSI1: 42a23dc694SShawn Guo return "imx-ssi.1"; 43a23dc694SShawn Guo case MX31_AUDMUX_PORT3_SSI_PINS_3: 44a23dc694SShawn Guo return "SSI3"; 45a23dc694SShawn Guo case MX31_AUDMUX_PORT4_SSI_PINS_4: 46a23dc694SShawn Guo return "SSI4"; 47a23dc694SShawn Guo case MX31_AUDMUX_PORT5_SSI_PINS_5: 48a23dc694SShawn Guo return "SSI5"; 49a23dc694SShawn Guo case MX31_AUDMUX_PORT6_SSI_PINS_6: 50a23dc694SShawn Guo return "SSI6"; 51a23dc694SShawn Guo default: 52a23dc694SShawn Guo return "UNKNOWN"; 53a23dc694SShawn Guo } 54a23dc694SShawn Guo } 55a23dc694SShawn Guo 56a23dc694SShawn Guo static ssize_t audmux_read_file(struct file *file, char __user *user_buf, 57a23dc694SShawn Guo size_t count, loff_t *ppos) 58a23dc694SShawn Guo { 59a23dc694SShawn Guo ssize_t ret; 601b3ed70aSFelipe Pena char *buf; 61e5f89768SMark Brown uintptr_t port = (uintptr_t)file->private_data; 62a23dc694SShawn Guo u32 pdcr, ptcr; 63a23dc694SShawn Guo 6472192366SFabio Estevam ret = clk_prepare_enable(audmux_clk); 6572192366SFabio Estevam if (ret) 6672192366SFabio Estevam return ret; 67a23dc694SShawn Guo 68a23dc694SShawn Guo ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port)); 69a23dc694SShawn Guo pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port)); 70a23dc694SShawn Guo 71a23dc694SShawn Guo clk_disable_unprepare(audmux_clk); 72a23dc694SShawn Guo 731b3ed70aSFelipe Pena buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 741b3ed70aSFelipe Pena if (!buf) 751b3ed70aSFelipe Pena return -ENOMEM; 761b3ed70aSFelipe Pena 77a39bc7cfSye xingchen ret = sysfs_emit(buf, "PDCR: %08x\nPTCR: %08x\n", pdcr, ptcr); 78a23dc694SShawn Guo 79a23dc694SShawn Guo if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR) 80c407cd00SSilvio Cesare ret += scnprintf(buf + ret, PAGE_SIZE - ret, 81a23dc694SShawn Guo "TxFS output from %s, ", 82a23dc694SShawn Guo audmux_port_string((ptcr >> 27) & 0x7)); 83a23dc694SShawn Guo else 84c407cd00SSilvio Cesare ret += scnprintf(buf + ret, PAGE_SIZE - ret, 85a23dc694SShawn Guo "TxFS input, "); 86a23dc694SShawn Guo 87a23dc694SShawn Guo if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR) 88c407cd00SSilvio Cesare ret += scnprintf(buf + ret, PAGE_SIZE - ret, 89a23dc694SShawn Guo "TxClk output from %s", 90a23dc694SShawn Guo audmux_port_string((ptcr >> 22) & 0x7)); 91a23dc694SShawn Guo else 92c407cd00SSilvio Cesare ret += scnprintf(buf + ret, PAGE_SIZE - ret, 93a23dc694SShawn Guo "TxClk input"); 94a23dc694SShawn Guo 95c407cd00SSilvio Cesare ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n"); 96a23dc694SShawn Guo 97a23dc694SShawn Guo if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) { 98c407cd00SSilvio Cesare ret += scnprintf(buf + ret, PAGE_SIZE - ret, 99a23dc694SShawn Guo "Port is symmetric"); 100a23dc694SShawn Guo } else { 101a23dc694SShawn Guo if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR) 102c407cd00SSilvio Cesare ret += scnprintf(buf + ret, PAGE_SIZE - ret, 103a23dc694SShawn Guo "RxFS output from %s, ", 104a23dc694SShawn Guo audmux_port_string((ptcr >> 17) & 0x7)); 105a23dc694SShawn Guo else 106c407cd00SSilvio Cesare ret += scnprintf(buf + ret, PAGE_SIZE - ret, 107a23dc694SShawn Guo "RxFS input, "); 108a23dc694SShawn Guo 109a23dc694SShawn Guo if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR) 110c407cd00SSilvio Cesare ret += scnprintf(buf + ret, PAGE_SIZE - ret, 111a23dc694SShawn Guo "RxClk output from %s", 112a23dc694SShawn Guo audmux_port_string((ptcr >> 12) & 0x7)); 113a23dc694SShawn Guo else 114c407cd00SSilvio Cesare ret += scnprintf(buf + ret, PAGE_SIZE - ret, 115a23dc694SShawn Guo "RxClk input"); 116a23dc694SShawn Guo } 117a23dc694SShawn Guo 118c407cd00SSilvio Cesare ret += scnprintf(buf + ret, PAGE_SIZE - ret, 119a23dc694SShawn Guo "\nData received from %s\n", 120a23dc694SShawn Guo audmux_port_string((pdcr >> 13) & 0x7)); 121a23dc694SShawn Guo 122a23dc694SShawn Guo ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 123a23dc694SShawn Guo 124a23dc694SShawn Guo kfree(buf); 125a23dc694SShawn Guo 126a23dc694SShawn Guo return ret; 127a23dc694SShawn Guo } 128a23dc694SShawn Guo 129a23dc694SShawn Guo static const struct file_operations audmux_debugfs_fops = { 1301eecb828SMark Brown .open = simple_open, 131a23dc694SShawn Guo .read = audmux_read_file, 132a23dc694SShawn Guo .llseek = default_llseek, 133a23dc694SShawn Guo }; 134a23dc694SShawn Guo 135b8909783SLars-Peter Clausen static void audmux_debugfs_init(void) 136a23dc694SShawn Guo { 137e5f89768SMark Brown uintptr_t i; 138a23dc694SShawn Guo char buf[20]; 139a23dc694SShawn Guo 140a23dc694SShawn Guo audmux_debugfs_root = debugfs_create_dir("audmux", NULL); 141a23dc694SShawn Guo 142409b78ccSTorben Hohn for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) { 143e5f89768SMark Brown snprintf(buf, sizeof(buf), "ssi%lu", i); 144227ab8baSGreg Kroah-Hartman debugfs_create_file(buf, 0444, audmux_debugfs_root, 145227ab8baSGreg Kroah-Hartman (void *)i, &audmux_debugfs_fops); 146a23dc694SShawn Guo } 147a23dc694SShawn Guo } 148a23dc694SShawn Guo 149a0a3d518SBill Pemberton static void audmux_debugfs_remove(void) 150a23dc694SShawn Guo { 151a23dc694SShawn Guo debugfs_remove_recursive(audmux_debugfs_root); 152a23dc694SShawn Guo } 153a23dc694SShawn Guo #else 154a23dc694SShawn Guo static inline void audmux_debugfs_init(void) 155a23dc694SShawn Guo { 156a23dc694SShawn Guo } 157a23dc694SShawn Guo 158a23dc694SShawn Guo static inline void audmux_debugfs_remove(void) 159a23dc694SShawn Guo { 160a23dc694SShawn Guo } 161a23dc694SShawn Guo #endif 162a23dc694SShawn Guo 163a10807aeSFabio Estevam static enum imx_audmux_type { 164a23dc694SShawn Guo IMX21_AUDMUX, 165a23dc694SShawn Guo IMX31_AUDMUX, 166a23dc694SShawn Guo } audmux_type; 167a23dc694SShawn Guo 168a23dc694SShawn Guo static const struct of_device_id imx_audmux_dt_ids[] = { 1696a8b8b58SFabio Estevam { .compatible = "fsl,imx21-audmux", .data = (void *)IMX21_AUDMUX, }, 1706a8b8b58SFabio Estevam { .compatible = "fsl,imx31-audmux", .data = (void *)IMX31_AUDMUX, }, 171a23dc694SShawn Guo { /* sentinel */ } 172a23dc694SShawn Guo }; 173a23dc694SShawn Guo MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids); 174a23dc694SShawn Guo 175a23dc694SShawn Guo static const uint8_t port_mapping[] = { 176a23dc694SShawn Guo 0x0, 0x4, 0x8, 0x10, 0x14, 0x1c, 177a23dc694SShawn Guo }; 178a23dc694SShawn Guo 179a23dc694SShawn Guo int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr) 180a23dc694SShawn Guo { 181a23dc694SShawn Guo if (audmux_type != IMX21_AUDMUX) 182a23dc694SShawn Guo return -EINVAL; 183a23dc694SShawn Guo 184a23dc694SShawn Guo if (!audmux_base) 185a23dc694SShawn Guo return -ENOSYS; 186a23dc694SShawn Guo 187a23dc694SShawn Guo if (port >= ARRAY_SIZE(port_mapping)) 188a23dc694SShawn Guo return -EINVAL; 189a23dc694SShawn Guo 190a23dc694SShawn Guo writel(pcr, audmux_base + port_mapping[port]); 191a23dc694SShawn Guo 192a23dc694SShawn Guo return 0; 193a23dc694SShawn Guo } 194a23dc694SShawn Guo EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port); 195a23dc694SShawn Guo 196a23dc694SShawn Guo int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr, 197a23dc694SShawn Guo unsigned int pdcr) 198a23dc694SShawn Guo { 19972192366SFabio Estevam int ret; 20072192366SFabio Estevam 201a23dc694SShawn Guo if (audmux_type != IMX31_AUDMUX) 202a23dc694SShawn Guo return -EINVAL; 203a23dc694SShawn Guo 204a23dc694SShawn Guo if (!audmux_base) 205a23dc694SShawn Guo return -ENOSYS; 206a23dc694SShawn Guo 20772192366SFabio Estevam ret = clk_prepare_enable(audmux_clk); 20872192366SFabio Estevam if (ret) 20972192366SFabio Estevam return ret; 210a23dc694SShawn Guo 211a23dc694SShawn Guo writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port)); 212a23dc694SShawn Guo writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port)); 213a23dc694SShawn Guo 214a23dc694SShawn Guo clk_disable_unprepare(audmux_clk); 215a23dc694SShawn Guo 216a23dc694SShawn Guo return 0; 217a23dc694SShawn Guo } 218a23dc694SShawn Guo EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port); 219a23dc694SShawn Guo 2208548a464SMarkus Pargmann static int imx_audmux_parse_dt_defaults(struct platform_device *pdev, 2218548a464SMarkus Pargmann struct device_node *of_node) 2228548a464SMarkus Pargmann { 2238548a464SMarkus Pargmann struct device_node *child; 2248548a464SMarkus Pargmann 2258548a464SMarkus Pargmann for_each_available_child_of_node(of_node, child) { 2268548a464SMarkus Pargmann unsigned int port; 2278548a464SMarkus Pargmann unsigned int ptcr = 0; 2288548a464SMarkus Pargmann unsigned int pdcr = 0; 2298548a464SMarkus Pargmann unsigned int pcr = 0; 2308548a464SMarkus Pargmann unsigned int val; 2318548a464SMarkus Pargmann int ret; 2328548a464SMarkus Pargmann int i = 0; 2338548a464SMarkus Pargmann 2348548a464SMarkus Pargmann ret = of_property_read_u32(child, "fsl,audmux-port", &port); 2358548a464SMarkus Pargmann if (ret) { 23606d15a2eSRob Herring dev_warn(&pdev->dev, "Failed to get fsl,audmux-port of child node \"%pOF\"\n", 23706d15a2eSRob Herring child); 2388548a464SMarkus Pargmann continue; 2398548a464SMarkus Pargmann } 2408548a464SMarkus Pargmann if (!of_property_read_bool(child, "fsl,port-config")) { 24106d15a2eSRob Herring dev_warn(&pdev->dev, "child node \"%pOF\" does not have property fsl,port-config\n", 24206d15a2eSRob Herring child); 2438548a464SMarkus Pargmann continue; 2448548a464SMarkus Pargmann } 2458548a464SMarkus Pargmann 2468548a464SMarkus Pargmann for (i = 0; (ret = of_property_read_u32_index(child, 2479c0aeaa3SMarkus Pargmann "fsl,port-config", i, &val)) == 0; 2488548a464SMarkus Pargmann ++i) { 2498548a464SMarkus Pargmann if (audmux_type == IMX31_AUDMUX) { 2508548a464SMarkus Pargmann if (i % 2) 2518548a464SMarkus Pargmann pdcr |= val; 2528548a464SMarkus Pargmann else 2538548a464SMarkus Pargmann ptcr |= val; 2548548a464SMarkus Pargmann } else { 2558548a464SMarkus Pargmann pcr |= val; 2568548a464SMarkus Pargmann } 2578548a464SMarkus Pargmann } 2588548a464SMarkus Pargmann 2599c0aeaa3SMarkus Pargmann if (ret != -EOVERFLOW) { 26006d15a2eSRob Herring dev_err(&pdev->dev, "Failed to read u32 at index %d of child %pOF\n", 26106d15a2eSRob Herring i, child); 2628548a464SMarkus Pargmann continue; 2638548a464SMarkus Pargmann } 2648548a464SMarkus Pargmann 2658548a464SMarkus Pargmann if (audmux_type == IMX31_AUDMUX) { 2668548a464SMarkus Pargmann if (i % 2) { 26706d15a2eSRob Herring dev_err(&pdev->dev, "One pdcr value is missing in child node %pOF\n", 26806d15a2eSRob Herring child); 2698548a464SMarkus Pargmann continue; 2708548a464SMarkus Pargmann } 2718548a464SMarkus Pargmann imx_audmux_v2_configure_port(port, ptcr, pdcr); 2728548a464SMarkus Pargmann } else { 2738548a464SMarkus Pargmann imx_audmux_v1_configure_port(port, pcr); 2748548a464SMarkus Pargmann } 2758548a464SMarkus Pargmann } 2768548a464SMarkus Pargmann 2778548a464SMarkus Pargmann return 0; 2788548a464SMarkus Pargmann } 2798548a464SMarkus Pargmann 280a0a3d518SBill Pemberton static int imx_audmux_probe(struct platform_device *pdev) 281a23dc694SShawn Guo { 282d003e308SYueHaibing audmux_base = devm_platform_ioremap_resource(pdev, 0); 283b25b5aa0SThierry Reding if (IS_ERR(audmux_base)) 284b25b5aa0SThierry Reding return PTR_ERR(audmux_base); 285a23dc694SShawn Guo 286127c5cadSFabio Estevam audmux_clk = devm_clk_get(&pdev->dev, "audmux"); 287a23dc694SShawn Guo if (IS_ERR(audmux_clk)) { 288a23dc694SShawn Guo dev_dbg(&pdev->dev, "cannot get clock: %ld\n", 289a23dc694SShawn Guo PTR_ERR(audmux_clk)); 290a23dc694SShawn Guo audmux_clk = NULL; 291a23dc694SShawn Guo } 292a23dc694SShawn Guo 2932f4a8171SFabio Estevam audmux_type = (uintptr_t)of_device_get_match_data(&pdev->dev); 2948661ab5bSShengjiu Wang 2958661ab5bSShengjiu Wang switch (audmux_type) { 2968661ab5bSShengjiu Wang case IMX31_AUDMUX: 297a23dc694SShawn Guo audmux_debugfs_init(); 2988661ab5bSShengjiu Wang reg_max = 14; 2998661ab5bSShengjiu Wang break; 3008661ab5bSShengjiu Wang case IMX21_AUDMUX: 3018661ab5bSShengjiu Wang reg_max = 6; 3028661ab5bSShengjiu Wang break; 3038661ab5bSShengjiu Wang default: 3048661ab5bSShengjiu Wang dev_err(&pdev->dev, "unsupported version!\n"); 3058661ab5bSShengjiu Wang return -EINVAL; 3068661ab5bSShengjiu Wang } 3078661ab5bSShengjiu Wang 3088661ab5bSShengjiu Wang regcache = devm_kzalloc(&pdev->dev, sizeof(u32) * reg_max, GFP_KERNEL); 3098661ab5bSShengjiu Wang if (!regcache) 3108661ab5bSShengjiu Wang return -ENOMEM; 311a23dc694SShawn Guo 3128548a464SMarkus Pargmann imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node); 3138548a464SMarkus Pargmann 314a23dc694SShawn Guo return 0; 315a23dc694SShawn Guo } 316a23dc694SShawn Guo 31751451f46SUwe Kleine-König static void imx_audmux_remove(struct platform_device *pdev) 318a23dc694SShawn Guo { 319a23dc694SShawn Guo if (audmux_type == IMX31_AUDMUX) 320a23dc694SShawn Guo audmux_debugfs_remove(); 321a23dc694SShawn Guo } 322a23dc694SShawn Guo 3238661ab5bSShengjiu Wang static int imx_audmux_suspend(struct device *dev) 3248661ab5bSShengjiu Wang { 3258661ab5bSShengjiu Wang int i; 3268661ab5bSShengjiu Wang 3278661ab5bSShengjiu Wang clk_prepare_enable(audmux_clk); 3288661ab5bSShengjiu Wang 3298661ab5bSShengjiu Wang for (i = 0; i < reg_max; i++) 3308661ab5bSShengjiu Wang regcache[i] = readl(audmux_base + i * 4); 3318661ab5bSShengjiu Wang 3328661ab5bSShengjiu Wang clk_disable_unprepare(audmux_clk); 3338661ab5bSShengjiu Wang 3348661ab5bSShengjiu Wang return 0; 3358661ab5bSShengjiu Wang } 3368661ab5bSShengjiu Wang 3378661ab5bSShengjiu Wang static int imx_audmux_resume(struct device *dev) 3388661ab5bSShengjiu Wang { 3398661ab5bSShengjiu Wang int i; 3408661ab5bSShengjiu Wang 3418661ab5bSShengjiu Wang clk_prepare_enable(audmux_clk); 3428661ab5bSShengjiu Wang 3438661ab5bSShengjiu Wang for (i = 0; i < reg_max; i++) 3448661ab5bSShengjiu Wang writel(regcache[i], audmux_base + i * 4); 3458661ab5bSShengjiu Wang 3468661ab5bSShengjiu Wang clk_disable_unprepare(audmux_clk); 3478661ab5bSShengjiu Wang 3488661ab5bSShengjiu Wang return 0; 3498661ab5bSShengjiu Wang } 3508661ab5bSShengjiu Wang 3518661ab5bSShengjiu Wang static const struct dev_pm_ops imx_audmux_pm = { 352*c504885aSFabio Estevam SYSTEM_SLEEP_PM_OPS(imx_audmux_suspend, imx_audmux_resume) 3538661ab5bSShengjiu Wang }; 3548661ab5bSShengjiu Wang 355a23dc694SShawn Guo static struct platform_driver imx_audmux_driver = { 356a23dc694SShawn Guo .probe = imx_audmux_probe, 35751451f46SUwe Kleine-König .remove_new = imx_audmux_remove, 358a23dc694SShawn Guo .driver = { 359a23dc694SShawn Guo .name = DRIVER_NAME, 360*c504885aSFabio Estevam .pm = pm_sleep_ptr(&imx_audmux_pm), 361a23dc694SShawn Guo .of_match_table = imx_audmux_dt_ids, 362a23dc694SShawn Guo } 363a23dc694SShawn Guo }; 364a23dc694SShawn Guo 365a23dc694SShawn Guo static int __init imx_audmux_init(void) 366a23dc694SShawn Guo { 367a23dc694SShawn Guo return platform_driver_register(&imx_audmux_driver); 368a23dc694SShawn Guo } 369a23dc694SShawn Guo subsys_initcall(imx_audmux_init); 370a23dc694SShawn Guo 371a23dc694SShawn Guo static void __exit imx_audmux_exit(void) 372a23dc694SShawn Guo { 373a23dc694SShawn Guo platform_driver_unregister(&imx_audmux_driver); 374a23dc694SShawn Guo } 375a23dc694SShawn Guo module_exit(imx_audmux_exit); 376a23dc694SShawn Guo 377a23dc694SShawn Guo MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver"); 378a23dc694SShawn Guo MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); 379a23dc694SShawn Guo MODULE_LICENSE("GPL v2"); 380a23dc694SShawn Guo MODULE_ALIAS("platform:" DRIVER_NAME); 381