arch/arm/plat-mxc/audmux.c

   1 /*
   2  * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
   3  *
   4  * Initial development of this code was funded by
   5  * Phytec Messtechnik GmbH, http://www.phytec.de
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/err.h>
  20 #include <linux/io.h>
  21 #include <linux/clk.h>
  22 #include <linux/debugfs.h>
  23 #include <linux/slab.h>
  24 #include <mach/audmux.h>
  25 #include <mach/hardware.h>
  26
  27 static struct clk *audmux_clk;
  28 static void __iomem *audmux_base;
  29
  30 #define MXC_AUDMUX_V2_PTCR(x)           ((x) * 8)
  31 #define MXC_AUDMUX_V2_PDCR(x)           ((x) * 8 + 4)
  32
  33 #ifdef CONFIG_DEBUG_FS
  34 static struct dentry *audmux_debugfs_root;
  35
  36 static int audmux_open_file(struct inode *inode, struct file *file)
  37 {
  38         file->private_data = inode->i_private;
  39         return 0;
  40 }
  41
  42 /* There is an annoying discontinuity in the SSI numbering with regard
  43  * to the Linux number of the devices */
  44 static const char *audmux_port_string(int port)
  45 {
  46         switch (port) {
  47         case MX31_AUDMUX_PORT1_SSI0:
  48                 return "imx-ssi.0";
  49         case MX31_AUDMUX_PORT2_SSI1:
  50                 return "imx-ssi.1";
  51         case MX31_AUDMUX_PORT3_SSI_PINS_3:
  52                 return "SSI3";
  53         case MX31_AUDMUX_PORT4_SSI_PINS_4:
  54                 return "SSI4";
  55         case MX31_AUDMUX_PORT5_SSI_PINS_5:
  56                 return "SSI5";
  57         case MX31_AUDMUX_PORT6_SSI_PINS_6:
  58                 return "SSI6";
  59         default:
  60                 return "UNKNOWN";
  61         }
  62 }
  63
  64 static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
  65                                 size_t count, loff_t *ppos)
  66 {
  67         ssize_t ret;
  68         char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
  69         int port = (int)file->private_data;
  70         u32 pdcr, ptcr;
  71
  72         if (!buf)
  73                 return -ENOMEM;
  74
  75         if (audmux_clk)
  76                 clk_enable(audmux_clk);
  77
  78         ptcr = readl(audmux_base + MXC_AUDMUX_V2_PTCR(port));
  79         pdcr = readl(audmux_base + MXC_AUDMUX_V2_PDCR(port));
  80
  81         if (audmux_clk)
  82                 clk_disable(audmux_clk);
  83
  84         ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
  85                        pdcr, ptcr);
  86
  87         if (ptcr & MXC_AUDMUX_V2_PTCR_TFSDIR)
  88                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  89                                 "TxFS output from %s, ",
  90                                 audmux_port_string((ptcr >> 27) & 0x7));
  91         else
  92                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  93                                 "TxFS input, ");
  94
  95         if (ptcr & MXC_AUDMUX_V2_PTCR_TCLKDIR)
  96                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  97                                 "TxClk output from %s",
  98                                 audmux_port_string((ptcr >> 22) & 0x7));
  99         else
 100                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 101                                 "TxClk input");
 102
 103         ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
 104
 105         if (ptcr & MXC_AUDMUX_V2_PTCR_SYN) {
 106                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 107                                 "Port is symmetric");
 108         } else {
 109                 if (ptcr & MXC_AUDMUX_V2_PTCR_RFSDIR)
 110                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 111                                         "RxFS output from %s, ",
 112                                         audmux_port_string((ptcr >> 17) & 0x7));
 113                 else
 114                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 115                                         "RxFS input, ");
 116
 117                 if (ptcr & MXC_AUDMUX_V2_PTCR_RCLKDIR)
 118                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 119                                         "RxClk output from %s",
 120                                         audmux_port_string((ptcr >> 12) & 0x7));
 121                 else
 122                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 123                                         "RxClk input");
 124         }
 125
 126         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 127                         "\nData received from %s\n",
 128                         audmux_port_string((pdcr >> 13) & 0x7));
 129
 130         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
 131
 132         kfree(buf);
 133
 134         return ret;
 135 }
 136
 137 static const struct file_operations audmux_debugfs_fops = {
 138         .open = audmux_open_file,
 139         .read = audmux_read_file,
 140         .llseek = default_llseek,
 141 };
 142
 143 static void audmux_debugfs_init(void)
 144 {
 145         int i;
 146         char buf[20];
 147
 148         audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
 149         if (!audmux_debugfs_root) {
 150                 pr_warning("Failed to create AUDMUX debugfs root\n");
 151                 return;
 152         }
 153
 154         for (i = 1; i < 8; i++) {
 155                 snprintf(buf, sizeof(buf), "ssi%d", i);
 156                 if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
 157                                          (void *)i, &audmux_debugfs_fops))
 158                         pr_warning("Failed to create AUDMUX port %d debugfs file\n",
 159                                    i);
 160         }
 161 }
 162 #else
 163 static inline void audmux_debugfs_init(void)
 164 {
 165 }
 166 #endif
 167
 168 static const uint8_t port_mapping[] = {
 169         0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
 170 };
 171
 172 int mxc_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
 173 {
 174         if (!audmux_base)
 175                 return -ENOSYS;
 176
 177         if (port >= ARRAY_SIZE(port_mapping))
 178                 return -EINVAL;
 179
 180         writel(pcr, audmux_base + port_mapping[port]);
 181
 182         return 0;
 183 }
 184 EXPORT_SYMBOL_GPL(mxc_audmux_v1_configure_port);
 185
 186 int mxc_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
 187                 unsigned int pdcr)
 188 {
 189         if (!audmux_base)
 190                 return -ENOSYS;
 191
 192         if (audmux_clk)
 193                 clk_enable(audmux_clk);
 194
 195         writel(ptcr, audmux_base + MXC_AUDMUX_V2_PTCR(port));
 196         writel(pdcr, audmux_base + MXC_AUDMUX_V2_PDCR(port));
 197
 198         if (audmux_clk)
 199                 clk_disable(audmux_clk);
 200
 201         return 0;
 202 }
 203 EXPORT_SYMBOL_GPL(mxc_audmux_v2_configure_port);
 204
 205 static int mxc_audmux_init(void)
 206 {
 207         int ret;
 208         if (cpu_is_mx51()) {
 209                 audmux_base = MX51_IO_ADDRESS(MX51_AUDMUX_BASE_ADDR);
 210         } else if (cpu_is_mx31()) {
 211                 audmux_base = MX31_IO_ADDRESS(MX31_AUDMUX_BASE_ADDR);
 212         } else if (cpu_is_mx35()) {
 213                 audmux_clk = clk_get(NULL, "audmux");
 214                 if (IS_ERR(audmux_clk)) {
 215                         ret = PTR_ERR(audmux_clk);
 216                         printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
 217                                         ret);
 218                         return ret;
 219                 }
 220                 audmux_base = MX35_IO_ADDRESS(MX35_AUDMUX_BASE_ADDR);
 221         } else if (cpu_is_mx25()) {
 222                 audmux_clk = clk_get(NULL, "audmux");
 223                 if (IS_ERR(audmux_clk)) {
 224                         ret = PTR_ERR(audmux_clk);
 225                         printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
 226                                         ret);
 227                         return ret;
 228                 }
 229                 audmux_base = MX25_IO_ADDRESS(MX25_AUDMUX_BASE_ADDR);
 230         } else if (cpu_is_mx27()) {
 231                 audmux_base = MX27_IO_ADDRESS(MX27_AUDMUX_BASE_ADDR);
 232         } else if (cpu_is_mx21()) {
 233                 audmux_base = MX21_IO_ADDRESS(MX21_AUDMUX_BASE_ADDR);
 234         }
 235
 236         if (!cpu_is_mx2())
 237                 audmux_debugfs_init();
 238
 239         return 0;
 240 }
 241
 242 postcore_initcall(mxc_audmux_init);