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 76*d5efccd5SMark Brown if (!audmux_base) 77*d5efccd5SMark Brown return -ENOSYS; 78*d5efccd5SMark Brown 79a23dc694SShawn Guo if (audmux_clk) 80a23dc694SShawn Guo clk_prepare_enable(audmux_clk); 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 158*d5efccd5SMark Brown for (i = 0; i < MX31_AUDMUX_PORT6_SSI_PINS_6 + 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 167a23dc694SShawn Guo static void __devexit 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 181a23dc694SShawn Guo 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 { 230a23dc694SShawn Guo if (audmux_type != IMX31_AUDMUX) 231a23dc694SShawn Guo return -EINVAL; 232a23dc694SShawn Guo 233a23dc694SShawn Guo if (!audmux_base) 234a23dc694SShawn Guo return -ENOSYS; 235a23dc694SShawn Guo 236a23dc694SShawn Guo if (audmux_clk) 237a23dc694SShawn Guo clk_prepare_enable(audmux_clk); 238a23dc694SShawn Guo 239a23dc694SShawn Guo writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port)); 240a23dc694SShawn Guo writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port)); 241a23dc694SShawn Guo 242a23dc694SShawn Guo if (audmux_clk) 243a23dc694SShawn Guo clk_disable_unprepare(audmux_clk); 244a23dc694SShawn Guo 245a23dc694SShawn Guo return 0; 246a23dc694SShawn Guo } 247a23dc694SShawn Guo EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port); 248a23dc694SShawn Guo 249a23dc694SShawn Guo static int __devinit imx_audmux_probe(struct platform_device *pdev) 250a23dc694SShawn Guo { 251a23dc694SShawn Guo struct resource *res; 252a23dc694SShawn Guo const struct of_device_id *of_id = 253a23dc694SShawn Guo of_match_device(imx_audmux_dt_ids, &pdev->dev); 254a23dc694SShawn Guo 255a23dc694SShawn Guo res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 256a23dc694SShawn Guo audmux_base = devm_request_and_ioremap(&pdev->dev, res); 257a23dc694SShawn Guo if (!audmux_base) 258a23dc694SShawn Guo return -EADDRNOTAVAIL; 259a23dc694SShawn Guo 260a23dc694SShawn Guo audmux_clk = clk_get(&pdev->dev, "audmux"); 261a23dc694SShawn Guo if (IS_ERR(audmux_clk)) { 262a23dc694SShawn Guo dev_dbg(&pdev->dev, "cannot get clock: %ld\n", 263a23dc694SShawn Guo PTR_ERR(audmux_clk)); 264a23dc694SShawn Guo audmux_clk = NULL; 265a23dc694SShawn Guo } 266a23dc694SShawn Guo 267a23dc694SShawn Guo if (of_id) 268a23dc694SShawn Guo pdev->id_entry = of_id->data; 269a23dc694SShawn Guo audmux_type = pdev->id_entry->driver_data; 270a23dc694SShawn Guo if (audmux_type == IMX31_AUDMUX) 271a23dc694SShawn Guo audmux_debugfs_init(); 272a23dc694SShawn Guo 273a23dc694SShawn Guo return 0; 274a23dc694SShawn Guo } 275a23dc694SShawn Guo 276a23dc694SShawn Guo static int __devexit imx_audmux_remove(struct platform_device *pdev) 277a23dc694SShawn Guo { 278a23dc694SShawn Guo if (audmux_type == IMX31_AUDMUX) 279a23dc694SShawn Guo audmux_debugfs_remove(); 280a23dc694SShawn Guo clk_put(audmux_clk); 281a23dc694SShawn Guo 282a23dc694SShawn Guo return 0; 283a23dc694SShawn Guo } 284a23dc694SShawn Guo 285a23dc694SShawn Guo static struct platform_driver imx_audmux_driver = { 286a23dc694SShawn Guo .probe = imx_audmux_probe, 287a23dc694SShawn Guo .remove = __devexit_p(imx_audmux_remove), 288a23dc694SShawn Guo .id_table = imx_audmux_ids, 289a23dc694SShawn Guo .driver = { 290a23dc694SShawn Guo .name = DRIVER_NAME, 291a23dc694SShawn Guo .owner = THIS_MODULE, 292a23dc694SShawn Guo .of_match_table = imx_audmux_dt_ids, 293a23dc694SShawn Guo } 294a23dc694SShawn Guo }; 295a23dc694SShawn Guo 296a23dc694SShawn Guo static int __init imx_audmux_init(void) 297a23dc694SShawn Guo { 298a23dc694SShawn Guo return platform_driver_register(&imx_audmux_driver); 299a23dc694SShawn Guo } 300a23dc694SShawn Guo subsys_initcall(imx_audmux_init); 301a23dc694SShawn Guo 302a23dc694SShawn Guo static void __exit imx_audmux_exit(void) 303a23dc694SShawn Guo { 304a23dc694SShawn Guo platform_driver_unregister(&imx_audmux_driver); 305a23dc694SShawn Guo } 306a23dc694SShawn Guo module_exit(imx_audmux_exit); 307a23dc694SShawn Guo 308a23dc694SShawn Guo MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver"); 309a23dc694SShawn Guo MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); 310a23dc694SShawn Guo MODULE_LICENSE("GPL v2"); 311a23dc694SShawn Guo MODULE_ALIAS("platform:" DRIVER_NAME); 312