omap: mux: Add debugfs support for new mux code
Tony Lindgren [Sat, 12 Dec 2009 00:16:32 +0000 (16:16 -0800)]
Add debugfs support for new mux code

Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/mux.c

index b082b50..d968433 100644 (file)
 #include <linux/io.h>
 #include <linux/spinlock.h>
 #include <linux/list.h>
+#include <linux/ctype.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
 
 #include <asm/system.h>
 
@@ -44,6 +48,7 @@ struct omap_mux_entry {
        struct list_head        node;
 };
 
+static unsigned long mux_phys;
 static void __iomem *mux_base;
 
 static inline u16 omap_mux_read(u16 reg)
@@ -807,6 +812,225 @@ int __init omap_mux_init_signal(char *muxname, int val)
        return -ENODEV;
 }
 
+#ifdef CONFIG_DEBUG_FS
+
+#define OMAP_MUX_MAX_NR_FLAGS  10
+#define OMAP_MUX_TEST_FLAG(val, mask)                          \
+       if (((val) & (mask)) == (mask)) {                       \
+               i++;                                            \
+               flags[i] =  #mask;                              \
+       }
+
+/* REVISIT: Add checking for non-optimal mux settings */
+static inline void omap_mux_decode(struct seq_file *s, u16 val)
+{
+       char *flags[OMAP_MUX_MAX_NR_FLAGS];
+       char mode[14];
+       int i = -1;
+
+       sprintf(mode, "OMAP_MUX_MODE%d", val & 0x7);
+       i++;
+       flags[i] = mode;
+
+       OMAP_MUX_TEST_FLAG(val, OMAP_PIN_OFF_WAKEUPENABLE);
+       if (val & OMAP_OFF_EN) {
+               if (!(val & OMAP_OFFOUT_EN)) {
+                       if (!(val & OMAP_OFF_PULL_UP)) {
+                               OMAP_MUX_TEST_FLAG(val,
+                                       OMAP_PIN_OFF_INPUT_PULLDOWN);
+                       } else {
+                               OMAP_MUX_TEST_FLAG(val,
+                                       OMAP_PIN_OFF_INPUT_PULLUP);
+                       }
+               } else {
+                       if (!(val & OMAP_OFFOUT_VAL)) {
+                               OMAP_MUX_TEST_FLAG(val,
+                                       OMAP_PIN_OFF_OUTPUT_LOW);
+                       } else {
+                               OMAP_MUX_TEST_FLAG(val,
+                                       OMAP_PIN_OFF_OUTPUT_HIGH);
+                       }
+               }
+       }
+
+       if (val & OMAP_INPUT_EN) {
+               if (val & OMAP_PULL_ENA) {
+                       if (!(val & OMAP_PULL_UP)) {
+                               OMAP_MUX_TEST_FLAG(val,
+                                       OMAP_PIN_INPUT_PULLDOWN);
+                       } else {
+                               OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT_PULLUP);
+                       }
+               } else {
+                       OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT);
+               }
+       } else {
+               i++;
+               flags[i] = "OMAP_PIN_OUTPUT";
+       }
+
+       do {
+               seq_printf(s, "%s", flags[i]);
+               if (i > 0)
+                       seq_printf(s, " | ");
+       } while (i-- > 0);
+}
+
+#define OMAP_MUX_DEFNAME_LEN   16
+
+static int omap_mux_dbg_board_show(struct seq_file *s, void *unused)
+{
+       struct omap_mux_entry *e;
+
+       list_for_each_entry(e, &muxmodes, node) {
+               struct omap_mux *m = &e->mux;
+               char m0_def[OMAP_MUX_DEFNAME_LEN];
+               char *m0_name = m->muxnames[0];
+               u16 val;
+               int i, mode;
+
+               if (!m0_name)
+                       continue;
+
+               for (i = 0; i < OMAP_MUX_DEFNAME_LEN; i++) {
+                       if (m0_name[i] == '\0') {
+                               m0_def[i] = m0_name[i];
+                               break;
+                       }
+                       m0_def[i] = toupper(m0_name[i]);
+               }
+               val = omap_mux_read(m->reg_offset);
+               mode = val & OMAP_MUX_MODE7;
+
+               seq_printf(s, "OMAP%i_MUX(%s, ",
+                                       cpu_is_omap34xx() ? 3 : 0, m0_def);
+               omap_mux_decode(s, val);
+               seq_printf(s, "),\n");
+       }
+
+       return 0;
+}
+
+static int omap_mux_dbg_board_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, omap_mux_dbg_board_show, &inode->i_private);
+}
+
+static const struct file_operations omap_mux_dbg_board_fops = {
+       .open           = omap_mux_dbg_board_open,
+       .read           = seq_read,
+       .llseek         = seq_lseek,
+       .release        = single_release,
+};
+
+static int omap_mux_dbg_signal_show(struct seq_file *s, void *unused)
+{
+       struct omap_mux *m = s->private;
+       const char *none = "NA";
+       u16 val;
+       int mode;
+
+       val = omap_mux_read(m->reg_offset);
+       mode = val & OMAP_MUX_MODE7;
+
+       seq_printf(s, "name: %s.%s (0x%08lx/0x%03x = 0x%04x), b %s, t %s\n",
+                       m->muxnames[0], m->muxnames[mode],
+                       mux_phys + m->reg_offset, m->reg_offset, val,
+                       m->balls[0] ? m->balls[0] : none,
+                       m->balls[1] ? m->balls[1] : none);
+       seq_printf(s, "mode: ");
+       omap_mux_decode(s, val);
+       seq_printf(s, "\n");
+       seq_printf(s, "signals: %s | %s | %s | %s | %s | %s | %s | %s\n",
+                       m->muxnames[0] ? m->muxnames[0] : none,
+                       m->muxnames[1] ? m->muxnames[1] : none,
+                       m->muxnames[2] ? m->muxnames[2] : none,
+                       m->muxnames[3] ? m->muxnames[3] : none,
+                       m->muxnames[4] ? m->muxnames[4] : none,
+                       m->muxnames[5] ? m->muxnames[5] : none,
+                       m->muxnames[6] ? m->muxnames[6] : none,
+                       m->muxnames[7] ? m->muxnames[7] : none);
+
+       return 0;
+}
+
+#define OMAP_MUX_MAX_ARG_CHAR  7
+
+static ssize_t omap_mux_dbg_signal_write(struct file *file,
+                                               const char __user *user_buf,
+                                               size_t count, loff_t *ppos)
+{
+       char buf[OMAP_MUX_MAX_ARG_CHAR];
+       struct seq_file *seqf;
+       struct omap_mux *m;
+       unsigned long val;
+       int buf_size, ret;
+
+       if (count > OMAP_MUX_MAX_ARG_CHAR)
+               return -EINVAL;
+
+       memset(buf, 0, sizeof(buf));
+       buf_size = min(count, sizeof(buf) - 1);
+
+       if (copy_from_user(buf, user_buf, buf_size))
+               return -EFAULT;
+
+       ret = strict_strtoul(buf, 0x10, &val);
+       if (ret < 0)
+               return ret;
+
+       if (val > 0xffff)
+               return -EINVAL;
+
+       seqf = file->private_data;
+       m = seqf->private;
+
+       omap_mux_write((u16)val, m->reg_offset);
+       *ppos += count;
+
+       return count;
+}
+
+static int omap_mux_dbg_signal_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, omap_mux_dbg_signal_show, inode->i_private);
+}
+
+static const struct file_operations omap_mux_dbg_signal_fops = {
+       .open           = omap_mux_dbg_signal_open,
+       .read           = seq_read,
+       .write          = omap_mux_dbg_signal_write,
+       .llseek         = seq_lseek,
+       .release        = single_release,
+};
+
+static struct dentry *mux_dbg_dir;
+
+static void __init omap_mux_dbg_init(void)
+{
+       struct omap_mux_entry *e;
+
+       mux_dbg_dir = debugfs_create_dir("omap_mux", NULL);
+       if (!mux_dbg_dir)
+               return;
+
+       (void)debugfs_create_file("board", S_IRUGO, mux_dbg_dir,
+                                       NULL, &omap_mux_dbg_board_fops);
+
+       list_for_each_entry(e, &muxmodes, node) {
+               struct omap_mux *m = &e->mux;
+
+               (void)debugfs_create_file(m->muxnames[0], S_IWUGO, mux_dbg_dir,
+                                       m, &omap_mux_dbg_signal_fops);
+       }
+}
+
+#else
+static inline void omap_mux_dbg_init(void)
+{
+}
+#endif /* CONFIG_DEBUG_FS */
+
 static void __init omap_mux_free_names(struct omap_mux *m)
 {
        int i;
@@ -843,6 +1067,8 @@ static int __init omap_mux_late_init(void)
 
        }
 
+       omap_mux_dbg_init();
+
        return 0;
 }
 late_initcall(omap_mux_late_init);
@@ -1107,6 +1333,7 @@ int __init omap_mux_init(u32 mux_pbase, u32 mux_size,
        if (mux_base)
                return -EBUSY;
 
+       mux_phys = mux_pbase;
        mux_base = ioremap(mux_pbase, mux_size);
        if (!mux_base) {
                printk(KERN_ERR "mux: Could not ioremap\n");