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