1a23dc694SShawn Guo /* 2a23dc694SShawn Guo * Copyright 2012 Freescale Semiconductor, Inc. 3a23dc694SShawn Guo * Copyright 2012 Linaro Ltd. 4a23dc694SShawn Guo * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de> 5a23dc694SShawn Guo * 6a23dc694SShawn Guo * Initial development of this code was funded by 7a23dc694SShawn Guo * Phytec Messtechnik GmbH, http://www.phytec.de 8a23dc694SShawn Guo * 9a23dc694SShawn Guo * This program is free software; you can redistribute it and/or modify 10a23dc694SShawn Guo * it under the terms of the GNU General Public License as published by 11a23dc694SShawn Guo * the Free Software Foundation; either version 2 of the License, or 12a23dc694SShawn Guo * (at your option) any later version. 13a23dc694SShawn Guo * 14a23dc694SShawn Guo * This program is distributed in the hope that it will be useful, 15a23dc694SShawn Guo * but WITHOUT ANY WARRANTY; without even the implied warranty of 16a23dc694SShawn Guo * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17a23dc694SShawn Guo * GNU General Public License for more details. 18a23dc694SShawn Guo */ 19a23dc694SShawn Guo 20a23dc694SShawn Guo #include <linux/clk.h> 21a23dc694SShawn Guo #include <linux/debugfs.h> 22a23dc694SShawn Guo #include <linux/err.h> 23a23dc694SShawn Guo #include <linux/io.h> 24a23dc694SShawn Guo #include <linux/module.h> 25a23dc694SShawn Guo #include <linux/of.h> 26a23dc694SShawn Guo #include <linux/of_device.h> 27a23dc694SShawn Guo #include <linux/platform_device.h> 28a23dc694SShawn Guo #include <linux/slab.h> 29a23dc694SShawn Guo 30a23dc694SShawn Guo #include "imx-audmux.h" 31a23dc694SShawn Guo 32a23dc694SShawn Guo #define DRIVER_NAME "imx-audmux" 33a23dc694SShawn Guo 34a23dc694SShawn Guo static struct clk *audmux_clk; 35a23dc694SShawn Guo static void __iomem *audmux_base; 36a23dc694SShawn Guo 37a23dc694SShawn Guo #define IMX_AUDMUX_V2_PTCR(x) ((x) * 8) 38a23dc694SShawn Guo #define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4) 39a23dc694SShawn Guo 40a23dc694SShawn Guo #ifdef CONFIG_DEBUG_FS 41a23dc694SShawn Guo static struct dentry *audmux_debugfs_root; 42a23dc694SShawn Guo 43a23dc694SShawn Guo /* There is an annoying discontinuity in the SSI numbering with regard 44a23dc694SShawn Guo * to the Linux number of the devices */ 45a23dc694SShawn Guo static const char *audmux_port_string(int port) 46a23dc694SShawn Guo { 47a23dc694SShawn Guo switch (port) { 48a23dc694SShawn Guo case MX31_AUDMUX_PORT1_SSI0: 49a23dc694SShawn Guo return "imx-ssi.0"; 50a23dc694SShawn Guo case MX31_AUDMUX_PORT2_SSI1: 51a23dc694SShawn Guo return "imx-ssi.1"; 52a23dc694SShawn Guo case MX31_AUDMUX_PORT3_SSI_PINS_3: 53a23dc694SShawn Guo return "SSI3"; 54a23dc694SShawn Guo case MX31_AUDMUX_PORT4_SSI_PINS_4: 55a23dc694SShawn Guo return "SSI4"; 56a23dc694SShawn Guo case MX31_AUDMUX_PORT5_SSI_PINS_5: 57a23dc694SShawn Guo return "SSI5"; 58a23dc694SShawn Guo case MX31_AUDMUX_PORT6_SSI_PINS_6: 59a23dc694SShawn Guo return "SSI6"; 60a23dc694SShawn Guo default: 61a23dc694SShawn Guo return "UNKNOWN"; 62a23dc694SShawn Guo } 63a23dc694SShawn Guo } 64a23dc694SShawn Guo 65a23dc694SShawn Guo static ssize_t audmux_read_file(struct file *file, char __user *user_buf, 66a23dc694SShawn Guo size_t count, loff_t *ppos) 67a23dc694SShawn Guo { 68a23dc694SShawn Guo ssize_t ret; 69a23dc694SShawn Guo char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 70a23dc694SShawn Guo int port = (int)file->private_data; 71a23dc694SShawn Guo u32 pdcr, ptcr; 72a23dc694SShawn Guo 73a23dc694SShawn Guo if (!buf) 74a23dc694SShawn Guo return -ENOMEM; 75a23dc694SShawn Guo 7672192366SFabio Estevam if (audmux_clk) { 7772192366SFabio Estevam ret = clk_prepare_enable(audmux_clk); 7872192366SFabio Estevam if (ret) 7972192366SFabio Estevam return ret; 8072192366SFabio Estevam } 81a23dc694SShawn Guo 82a23dc694SShawn Guo ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port)); 83a23dc694SShawn Guo pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port)); 84a23dc694SShawn Guo 85a23dc694SShawn Guo if (audmux_clk) 86a23dc694SShawn Guo clk_disable_unprepare(audmux_clk); 87a23dc694SShawn Guo 88a23dc694SShawn Guo ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n", 89a23dc694SShawn Guo pdcr, ptcr); 90a23dc694SShawn Guo 91a23dc694SShawn Guo if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR) 92a23dc694SShawn Guo ret += snprintf(buf + ret, PAGE_SIZE - ret, 93a23dc694SShawn Guo "TxFS output from %s, ", 94a23dc694SShawn Guo audmux_port_string((ptcr >> 27) & 0x7)); 95a23dc694SShawn Guo else 96a23dc694SShawn Guo ret += snprintf(buf + ret, PAGE_SIZE - ret, 97a23dc694SShawn Guo "TxFS input, "); 98a23dc694SShawn Guo 99a23dc694SShawn Guo if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR) 100a23dc694SShawn Guo ret += snprintf(buf + ret, PAGE_SIZE - ret, 101a23dc694SShawn Guo "TxClk output from %s", 102a23dc694SShawn Guo audmux_port_string((ptcr >> 22) & 0x7)); 103a23dc694SShawn Guo else 104a23dc694SShawn Guo ret += snprintf(buf + ret, PAGE_SIZE - ret, 105a23dc694SShawn Guo "TxClk input"); 106a23dc694SShawn Guo 107a23dc694SShawn Guo ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n"); 108a23dc694SShawn Guo 109a23dc694SShawn Guo if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) { 110a23dc694SShawn Guo ret += snprintf(buf + ret, PAGE_SIZE - ret, 111a23dc694SShawn Guo "Port is symmetric"); 112a23dc694SShawn Guo } else { 113a23dc694SShawn Guo if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR) 114a23dc694SShawn Guo ret += snprintf(buf + ret, PAGE_SIZE - ret, 115a23dc694SShawn Guo "RxFS output from %s, ", 116a23dc694SShawn Guo audmux_port_string((ptcr >> 17) & 0x7)); 117a23dc694SShawn Guo else 118a23dc694SShawn Guo ret += snprintf(buf + ret, PAGE_SIZE - ret, 119a23dc694SShawn Guo "RxFS input, "); 120a23dc694SShawn Guo 121a23dc694SShawn Guo if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR) 122a23dc694SShawn Guo ret += snprintf(buf + ret, PAGE_SIZE - ret, 123a23dc694SShawn Guo "RxClk output from %s", 124a23dc694SShawn Guo audmux_port_string((ptcr >> 12) & 0x7)); 125a23dc694SShawn Guo else 126a23dc694SShawn Guo ret += snprintf(buf + ret, PAGE_SIZE - ret, 127a23dc694SShawn Guo "RxClk input"); 128a23dc694SShawn Guo } 129a23dc694SShawn Guo 130a23dc694SShawn Guo ret += snprintf(buf + ret, PAGE_SIZE - ret, 131a23dc694SShawn Guo "\nData received from %s\n", 132a23dc694SShawn Guo audmux_port_string((pdcr >> 13) & 0x7)); 133a23dc694SShawn Guo 134a23dc694SShawn Guo ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 135a23dc694SShawn Guo 136a23dc694SShawn Guo kfree(buf); 137a23dc694SShawn Guo 138a23dc694SShawn Guo return ret; 139a23dc694SShawn Guo } 140a23dc694SShawn Guo 141a23dc694SShawn Guo static const struct file_operations audmux_debugfs_fops = { 1421eecb828SMark Brown .open = simple_open, 143a23dc694SShawn Guo .read = audmux_read_file, 144a23dc694SShawn Guo .llseek = default_llseek, 145a23dc694SShawn Guo }; 146a23dc694SShawn Guo 147a23dc694SShawn Guo static void __init audmux_debugfs_init(void) 148a23dc694SShawn Guo { 149a23dc694SShawn Guo int i; 150a23dc694SShawn Guo char buf[20]; 151a23dc694SShawn Guo 152a23dc694SShawn Guo audmux_debugfs_root = debugfs_create_dir("audmux", NULL); 153a23dc694SShawn Guo if (!audmux_debugfs_root) { 154a23dc694SShawn Guo pr_warning("Failed to create AUDMUX debugfs root\n"); 155a23dc694SShawn Guo return; 156a23dc694SShawn Guo } 157a23dc694SShawn Guo 158409b78ccSTorben Hohn for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) { 159a23dc694SShawn Guo snprintf(buf, sizeof(buf), "ssi%d", i); 160a23dc694SShawn Guo if (!debugfs_create_file(buf, 0444, audmux_debugfs_root, 161a23dc694SShawn Guo (void *)i, &audmux_debugfs_fops)) 162a23dc694SShawn Guo pr_warning("Failed to create AUDMUX port %d debugfs file\n", 163a23dc694SShawn Guo i); 164a23dc694SShawn Guo } 165a23dc694SShawn Guo } 166a23dc694SShawn Guo 167a0a3d518SBill Pemberton static void audmux_debugfs_remove(void) 168a23dc694SShawn Guo { 169a23dc694SShawn Guo debugfs_remove_recursive(audmux_debugfs_root); 170a23dc694SShawn Guo } 171a23dc694SShawn Guo #else 172a23dc694SShawn Guo static inline void audmux_debugfs_init(void) 173a23dc694SShawn Guo { 174a23dc694SShawn Guo } 175a23dc694SShawn Guo 176a23dc694SShawn Guo static inline void audmux_debugfs_remove(void) 177a23dc694SShawn Guo { 178a23dc694SShawn Guo } 179a23dc694SShawn Guo #endif 180a23dc694SShawn Guo 181a10807aeSFabio Estevam static enum imx_audmux_type { 182a23dc694SShawn Guo IMX21_AUDMUX, 183a23dc694SShawn Guo IMX31_AUDMUX, 184a23dc694SShawn Guo } audmux_type; 185a23dc694SShawn Guo 186a23dc694SShawn Guo static struct platform_device_id imx_audmux_ids[] = { 187a23dc694SShawn Guo { 188a23dc694SShawn Guo .name = "imx21-audmux", 189a23dc694SShawn Guo .driver_data = IMX21_AUDMUX, 190a23dc694SShawn Guo }, { 191a23dc694SShawn Guo .name = "imx31-audmux", 192a23dc694SShawn Guo .driver_data = IMX31_AUDMUX, 193a23dc694SShawn Guo }, { 194a23dc694SShawn Guo /* sentinel */ 195a23dc694SShawn Guo } 196a23dc694SShawn Guo }; 197a23dc694SShawn Guo MODULE_DEVICE_TABLE(platform, imx_audmux_ids); 198a23dc694SShawn Guo 199a23dc694SShawn Guo static const struct of_device_id imx_audmux_dt_ids[] = { 200a23dc694SShawn Guo { .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], }, 201a23dc694SShawn Guo { .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], }, 202a23dc694SShawn Guo { /* sentinel */ } 203a23dc694SShawn Guo }; 204a23dc694SShawn Guo MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids); 205a23dc694SShawn Guo 206a23dc694SShawn Guo static const uint8_t port_mapping[] = { 207a23dc694SShawn Guo 0x0, 0x4, 0x8, 0x10, 0x14, 0x1c, 208a23dc694SShawn Guo }; 209a23dc694SShawn Guo 210a23dc694SShawn Guo int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr) 211a23dc694SShawn Guo { 212a23dc694SShawn Guo if (audmux_type != IMX21_AUDMUX) 213a23dc694SShawn Guo return -EINVAL; 214a23dc694SShawn Guo 215a23dc694SShawn Guo if (!audmux_base) 216a23dc694SShawn Guo return -ENOSYS; 217a23dc694SShawn Guo 218a23dc694SShawn Guo if (port >= ARRAY_SIZE(port_mapping)) 219a23dc694SShawn Guo return -EINVAL; 220a23dc694SShawn Guo 221a23dc694SShawn Guo writel(pcr, audmux_base + port_mapping[port]); 222a23dc694SShawn Guo 223a23dc694SShawn Guo return 0; 224a23dc694SShawn Guo } 225a23dc694SShawn Guo EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port); 226a23dc694SShawn Guo 227a23dc694SShawn Guo int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr, 228a23dc694SShawn Guo unsigned int pdcr) 229a23dc694SShawn Guo { 23072192366SFabio Estevam int ret; 23172192366SFabio Estevam 232a23dc694SShawn Guo if (audmux_type != IMX31_AUDMUX) 233a23dc694SShawn Guo return -EINVAL; 234a23dc694SShawn Guo 235a23dc694SShawn Guo if (!audmux_base) 236a23dc694SShawn Guo return -ENOSYS; 237a23dc694SShawn Guo 23872192366SFabio Estevam if (audmux_clk) { 23972192366SFabio Estevam ret = clk_prepare_enable(audmux_clk); 24072192366SFabio Estevam if (ret) 24172192366SFabio Estevam return ret; 24272192366SFabio Estevam } 243a23dc694SShawn Guo 244a23dc694SShawn Guo writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port)); 245a23dc694SShawn Guo writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port)); 246a23dc694SShawn Guo 247a23dc694SShawn Guo if (audmux_clk) 248a23dc694SShawn Guo clk_disable_unprepare(audmux_clk); 249a23dc694SShawn Guo 250a23dc694SShawn Guo return 0; 251a23dc694SShawn Guo } 252a23dc694SShawn Guo EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port); 253a23dc694SShawn Guo 254*8548a464SMarkus Pargmann static int imx_audmux_parse_dt_defaults(struct platform_device *pdev, 255*8548a464SMarkus Pargmann struct device_node *of_node) 256*8548a464SMarkus Pargmann { 257*8548a464SMarkus Pargmann struct device_node *child; 258*8548a464SMarkus Pargmann 259*8548a464SMarkus Pargmann for_each_available_child_of_node(of_node, child) { 260*8548a464SMarkus Pargmann unsigned int port; 261*8548a464SMarkus Pargmann unsigned int ptcr = 0; 262*8548a464SMarkus Pargmann unsigned int pdcr = 0; 263*8548a464SMarkus Pargmann unsigned int pcr = 0; 264*8548a464SMarkus Pargmann unsigned int val; 265*8548a464SMarkus Pargmann int ret; 266*8548a464SMarkus Pargmann int i = 0; 267*8548a464SMarkus Pargmann 268*8548a464SMarkus Pargmann ret = of_property_read_u32(child, "fsl,audmux-port", &port); 269*8548a464SMarkus Pargmann if (ret) { 270*8548a464SMarkus Pargmann dev_warn(&pdev->dev, "Failed to get fsl,audmux-port of child node \"%s\"\n", 271*8548a464SMarkus Pargmann child->full_name); 272*8548a464SMarkus Pargmann continue; 273*8548a464SMarkus Pargmann } 274*8548a464SMarkus Pargmann if (!of_property_read_bool(child, "fsl,port-config")) { 275*8548a464SMarkus Pargmann dev_warn(&pdev->dev, "child node \"%s\" does not have property fsl,port-config\n", 276*8548a464SMarkus Pargmann child->full_name); 277*8548a464SMarkus Pargmann continue; 278*8548a464SMarkus Pargmann } 279*8548a464SMarkus Pargmann 280*8548a464SMarkus Pargmann for (i = 0; (ret = of_property_read_u32_index(child, 281*8548a464SMarkus Pargmann "fsl,port-config\n", i, &val)) == 0; 282*8548a464SMarkus Pargmann ++i) { 283*8548a464SMarkus Pargmann if (audmux_type == IMX31_AUDMUX) { 284*8548a464SMarkus Pargmann if (i % 2) 285*8548a464SMarkus Pargmann pdcr |= val; 286*8548a464SMarkus Pargmann else 287*8548a464SMarkus Pargmann ptcr |= val; 288*8548a464SMarkus Pargmann } else { 289*8548a464SMarkus Pargmann pcr |= val; 290*8548a464SMarkus Pargmann } 291*8548a464SMarkus Pargmann } 292*8548a464SMarkus Pargmann 293*8548a464SMarkus Pargmann if (ret != -ENODATA) { 294*8548a464SMarkus Pargmann dev_err(&pdev->dev, "Failed to read u32 at index %d of child %s\n", 295*8548a464SMarkus Pargmann i, child->full_name); 296*8548a464SMarkus Pargmann continue; 297*8548a464SMarkus Pargmann } 298*8548a464SMarkus Pargmann 299*8548a464SMarkus Pargmann if (audmux_type == IMX31_AUDMUX) { 300*8548a464SMarkus Pargmann if (i % 2) { 301*8548a464SMarkus Pargmann dev_err(&pdev->dev, "One pdcr value is missing in child node %s\n", 302*8548a464SMarkus Pargmann child->full_name); 303*8548a464SMarkus Pargmann continue; 304*8548a464SMarkus Pargmann } 305*8548a464SMarkus Pargmann imx_audmux_v2_configure_port(port, ptcr, pdcr); 306*8548a464SMarkus Pargmann } else { 307*8548a464SMarkus Pargmann imx_audmux_v1_configure_port(port, pcr); 308*8548a464SMarkus Pargmann } 309*8548a464SMarkus Pargmann } 310*8548a464SMarkus Pargmann 311*8548a464SMarkus Pargmann return 0; 312*8548a464SMarkus Pargmann } 313*8548a464SMarkus Pargmann 314a0a3d518SBill Pemberton static int imx_audmux_probe(struct platform_device *pdev) 315a23dc694SShawn Guo { 316a23dc694SShawn Guo struct resource *res; 317a23dc694SShawn Guo const struct of_device_id *of_id = 318a23dc694SShawn Guo of_match_device(imx_audmux_dt_ids, &pdev->dev); 319a23dc694SShawn Guo 320a23dc694SShawn Guo res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 321b25b5aa0SThierry Reding audmux_base = devm_ioremap_resource(&pdev->dev, res); 322b25b5aa0SThierry Reding if (IS_ERR(audmux_base)) 323b25b5aa0SThierry Reding return PTR_ERR(audmux_base); 324a23dc694SShawn Guo 325127c5cadSFabio Estevam audmux_clk = devm_clk_get(&pdev->dev, "audmux"); 326a23dc694SShawn Guo if (IS_ERR(audmux_clk)) { 327a23dc694SShawn Guo dev_dbg(&pdev->dev, "cannot get clock: %ld\n", 328a23dc694SShawn Guo PTR_ERR(audmux_clk)); 329a23dc694SShawn Guo audmux_clk = NULL; 330a23dc694SShawn Guo } 331a23dc694SShawn Guo 332a23dc694SShawn Guo if (of_id) 333a23dc694SShawn Guo pdev->id_entry = of_id->data; 334a23dc694SShawn Guo audmux_type = pdev->id_entry->driver_data; 335a23dc694SShawn Guo if (audmux_type == IMX31_AUDMUX) 336a23dc694SShawn Guo audmux_debugfs_init(); 337a23dc694SShawn Guo 338*8548a464SMarkus Pargmann imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node); 339*8548a464SMarkus Pargmann 340a23dc694SShawn Guo return 0; 341a23dc694SShawn Guo } 342a23dc694SShawn Guo 343a0a3d518SBill Pemberton static int imx_audmux_remove(struct platform_device *pdev) 344a23dc694SShawn Guo { 345a23dc694SShawn Guo if (audmux_type == IMX31_AUDMUX) 346a23dc694SShawn Guo audmux_debugfs_remove(); 347a23dc694SShawn Guo 348a23dc694SShawn Guo return 0; 349a23dc694SShawn Guo } 350a23dc694SShawn Guo 351a23dc694SShawn Guo static struct platform_driver imx_audmux_driver = { 352a23dc694SShawn Guo .probe = imx_audmux_probe, 353a0a3d518SBill Pemberton .remove = imx_audmux_remove, 354a23dc694SShawn Guo .id_table = imx_audmux_ids, 355a23dc694SShawn Guo .driver = { 356a23dc694SShawn Guo .name = DRIVER_NAME, 357a23dc694SShawn Guo .owner = THIS_MODULE, 358a23dc694SShawn Guo .of_match_table = imx_audmux_dt_ids, 359a23dc694SShawn Guo } 360a23dc694SShawn Guo }; 361a23dc694SShawn Guo 362a23dc694SShawn Guo static int __init imx_audmux_init(void) 363a23dc694SShawn Guo { 364a23dc694SShawn Guo return platform_driver_register(&imx_audmux_driver); 365a23dc694SShawn Guo } 366a23dc694SShawn Guo subsys_initcall(imx_audmux_init); 367a23dc694SShawn Guo 368a23dc694SShawn Guo static void __exit imx_audmux_exit(void) 369a23dc694SShawn Guo { 370a23dc694SShawn Guo platform_driver_unregister(&imx_audmux_driver); 371a23dc694SShawn Guo } 372a23dc694SShawn Guo module_exit(imx_audmux_exit); 373a23dc694SShawn Guo 374a23dc694SShawn Guo MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver"); 375a23dc694SShawn Guo MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); 376a23dc694SShawn Guo MODULE_LICENSE("GPL v2"); 377a23dc694SShawn Guo MODULE_ALIAS("platform:" DRIVER_NAME); 378