release/src-rt-6.x.4708/linux/linux-2.6.36/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
  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 };
 141
 142 static void audmux_debugfs_init(void)
 143 {
 144         int i;
 145         char buf[20];
 146
 147         audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
 148         if (!audmux_debugfs_root) {
 149                 pr_warning("Failed to create AUDMUX debugfs root\n");
 150                 return;
 151         }
 152
 153         for (i = 1; i < 8; i++) {
 154                 snprintf(buf, sizeof(buf), "ssi%d", i);
 155                 if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
 156                                          (void *)i, &audmux_debugfs_fops))
 157                         pr_warning("Failed to create AUDMUX port %d debugfs file\n",
 158                                    i);
 159         }
 160 }
 161 #else
 162 static inline void audmux_debugfs_init(void)
 163 {
 164 }
 165 #endif
 166
 167 int mxc_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
 168                 unsigned int pdcr)
 169 {
 170         if (!audmux_base)
 171                 return -ENOSYS;
 172
 173         if (audmux_clk)
 174                 clk_enable(audmux_clk);
 175
 176         writel(ptcr, audmux_base + MXC_AUDMUX_V2_PTCR(port));
 177         writel(pdcr, audmux_base + MXC_AUDMUX_V2_PDCR(port));
 178
 179         if (audmux_clk)
 180                 clk_disable(audmux_clk);
 181
 182         return 0;
 183 }
 184 EXPORT_SYMBOL_GPL(mxc_audmux_v2_configure_port);
 185
 186 static int mxc_audmux_v2_init(void)
 187 {
 188         int ret;
 189
 190 #if defined(CONFIG_ARCH_MX3)
 191         if (cpu_is_mx31())
 192                 audmux_base = MX31_IO_ADDRESS(MX31_AUDMUX_BASE_ADDR);
 193
 194         else if (cpu_is_mx35()) {
 195                 audmux_clk = clk_get(NULL, "audmux");
 196                 if (IS_ERR(audmux_clk)) {
 197                         ret = PTR_ERR(audmux_clk);
 198                         printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
 199                                         ret);
 200                         return ret;
 201                 }
 202                 audmux_base = MX35_IO_ADDRESS(MX35_AUDMUX_BASE_ADDR);
 203         }
 204 #endif
 205 #if defined(CONFIG_ARCH_MX25)
 206         if (cpu_is_mx25()) {
 207                 audmux_clk = clk_get(NULL, "audmux");
 208                 if (IS_ERR(audmux_clk)) {
 209                         ret = PTR_ERR(audmux_clk);
 210                         printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
 211                                         ret);
 212                         return ret;
 213                 }
 214                 audmux_base = MX25_IO_ADDRESS(MX25_AUDMUX_BASE_ADDR);
 215         }
 216 #endif
 217         audmux_debugfs_init();
 218
 219         return 0;
 220 }
 221
 222 postcore_initcall(mxc_audmux_v2_init);