arch/arm/plat-mxc/audmux-v2.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  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/err.h>
  24 #include <linux/io.h>
  25 #include <linux/clk.h>
  26 #include <linux/debugfs.h>
  27 #include <linux/slab.h>
  28 #include <mach/audmux.h>
  29 #include <mach/hardware.h>
  30
  31 static struct clk *audmux_clk;
  32 static void __iomem *audmux_base;
  33
  34 #define MXC_AUDMUX_V2_PTCR(x)           ((x) * 8)
  35 #define MXC_AUDMUX_V2_PDCR(x)           ((x) * 8 + 4)
  36
  37 #ifdef CONFIG_DEBUG_FS
  38 static struct dentry *audmux_debugfs_root;
  39
  40 static int audmux_open_file(struct inode *inode, struct file *file)
  41 {
  42         file->private_data = inode->i_private;
  43         return 0;
  44 }
  45
  46 /* There is an annoying discontinuity in the SSI numbering with regard
  47  * to the Linux number of the devices */
  48 static const char *audmux_port_string(int port)
  49 {
  50         switch (port) {
  51         case MX31_AUDMUX_PORT1_SSI0:
  52                 return "imx-ssi.0";
  53         case MX31_AUDMUX_PORT2_SSI1:
  54                 return "imx-ssi.1";
  55         case MX31_AUDMUX_PORT3_SSI_PINS_3:
  56                 return "SSI3";
  57         case MX31_AUDMUX_PORT4_SSI_PINS_4:
  58                 return "SSI4";
  59         case MX31_AUDMUX_PORT5_SSI_PINS_5:
  60                 return "SSI5";
  61         case MX31_AUDMUX_PORT6_SSI_PINS_6:
  62                 return "SSI6";
  63         default:
  64                 return "UNKNOWN";
  65         }
  66 }
  67
  68 static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
  69                                 size_t count, loff_t *ppos)
  70 {
  71         ssize_t ret;
  72         char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
  73         int port = (int)file->private_data;
  74         u32 pdcr, ptcr;
  75
  76         if (!buf)
  77                 return -ENOMEM;
  78
  79         if (audmux_clk)
  80                 clk_enable(audmux_clk);
  81
  82         ptcr = readl(audmux_base + MXC_AUDMUX_V2_PTCR(port));
  83         pdcr = readl(audmux_base + MXC_AUDMUX_V2_PDCR(port));
  84
  85         if (audmux_clk)
  86                 clk_disable(audmux_clk);
  87
  88         ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
  89                        pdcr, ptcr);
  90
  91         if (ptcr & MXC_AUDMUX_V2_PTCR_TFSDIR)
  92                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  93                                 "TxFS output from %s, ",
  94                                 audmux_port_string((ptcr >> 27) & 0x7));
  95         else
  96                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  97                                 "TxFS input, ");
  98
  99         if (ptcr & MXC_AUDMUX_V2_PTCR_TCLKDIR)
 100                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 101                                 "TxClk output from %s",
 102                                 audmux_port_string((ptcr >> 22) & 0x7));
 103         else
 104                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 105                                 "TxClk input");
 106
 107         ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
 108
 109         if (ptcr & MXC_AUDMUX_V2_PTCR_SYN) {
 110                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 111                                 "Port is symmetric");
 112         } else {
 113                 if (ptcr & MXC_AUDMUX_V2_PTCR_RFSDIR)
 114                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 115                                         "RxFS output from %s, ",
 116                                         audmux_port_string((ptcr >> 17) & 0x7));
 117                 else
 118                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 119                                         "RxFS input, ");
 120
 121                 if (ptcr & MXC_AUDMUX_V2_PTCR_RCLKDIR)
 122                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 123                                         "RxClk output from %s",
 124                                         audmux_port_string((ptcr >> 12) & 0x7));
 125                 else
 126                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 127                                         "RxClk input");
 128         }
 129
 130         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 131                         "\nData received from %s\n",
 132                         audmux_port_string((pdcr >> 13) & 0x7));
 133
 134         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
 135
 136         kfree(buf);
 137
 138         return ret;
 139 }
 140
 141 static const struct file_operations audmux_debugfs_fops = {
 142         .open = audmux_open_file,
 143         .read = audmux_read_file,
 144 };
 145
 146 static void audmux_debugfs_init(void)
 147 {
 148         int i;
 149         char buf[20];
 150
 151         audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
 152         if (!audmux_debugfs_root) {
 153                 pr_warning("Failed to create AUDMUX debugfs root\n");
 154                 return;
 155         }
 156
 157         for (i = 1; i < 8; i++) {
 158                 snprintf(buf, sizeof(buf), "ssi%d", i);
 159                 if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
 160                                          (void *)i, &audmux_debugfs_fops))
 161                         pr_warning("Failed to create AUDMUX port %d debugfs file\n",
 162                                    i);
 163         }
 164 }
 165 #else
 166 static inline void audmux_debugfs_init(void)
 167 {
 168 }
 169 #endif
 170
 171 int mxc_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
 172                 unsigned int pdcr)
 173 {
 174         if (!audmux_base)
 175                 return -ENOSYS;
 176
 177         if (audmux_clk)
 178                 clk_enable(audmux_clk);
 179
 180         writel(ptcr, audmux_base + MXC_AUDMUX_V2_PTCR(port));
 181         writel(pdcr, audmux_base + MXC_AUDMUX_V2_PDCR(port));
 182
 183         if (audmux_clk)
 184                 clk_disable(audmux_clk);
 185
 186         return 0;
 187 }
 188 EXPORT_SYMBOL_GPL(mxc_audmux_v2_configure_port);
 189
 190 static int mxc_audmux_v2_init(void)
 191 {
 192         int ret;
 193
 194         if (cpu_is_mx31())
 195                 audmux_base = MX31_IO_ADDRESS(MX31_AUDMUX_BASE_ADDR);
 196
 197         else if (cpu_is_mx35()) {
 198                 audmux_clk = clk_get(NULL, "audmux");
 199                 if (IS_ERR(audmux_clk)) {
 200                         ret = PTR_ERR(audmux_clk);
 201                         printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
 202                                         ret);
 203                         return ret;
 204                 }
 205                 audmux_base = MX35_IO_ADDRESS(MX35_AUDMUX_BASE_ADDR);
 206         }
 207
 208         audmux_debugfs_init();
 209
 210         return 0;
 211 }
 212
 213 postcore_initcall(mxc_audmux_v2_init);