aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/plat-mxc/audmux-v2.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/plat-mxc/audmux-v2.c')
-rw-r--r--arch/arm/plat-mxc/audmux-v2.c137
1 files changed, 137 insertions, 0 deletions
diff --git a/arch/arm/plat-mxc/audmux-v2.c b/arch/arm/plat-mxc/audmux-v2.c
index 6f21096086f..b06954a8443 100644
--- a/arch/arm/plat-mxc/audmux-v2.c
+++ b/arch/arm/plat-mxc/audmux-v2.c
@@ -23,6 +23,7 @@
#include <linux/err.h>
#include <linux/io.h>
#include <linux/clk.h>
+#include <linux/debugfs.h>
#include <mach/audmux.h>
#include <mach/hardware.h>
@@ -32,6 +33,140 @@ static void __iomem *audmux_base;
#define MXC_AUDMUX_V2_PTCR(x) ((x) * 8)
#define MXC_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
+#ifdef CONFIG_DEBUG_FS
+static struct dentry *audmux_debugfs_root;
+
+static int audmux_open_file(struct inode *inode, struct file *file)
+{
+ file->private_data = inode->i_private;
+ return 0;
+}
+
+/* There is an annoying discontinuity in the SSI numbering with regard
+ * to the Linux number of the devices */
+static const char *audmux_port_string(int port)
+{
+ switch (port) {
+ case MX31_AUDMUX_PORT1_SSI0:
+ return "imx-ssi.0";
+ case MX31_AUDMUX_PORT2_SSI1:
+ return "imx-ssi.1";
+ case MX31_AUDMUX_PORT3_SSI_PINS_3:
+ return "SSI3";
+ case MX31_AUDMUX_PORT4_SSI_PINS_4:
+ return "SSI4";
+ case MX31_AUDMUX_PORT5_SSI_PINS_5:
+ return "SSI5";
+ case MX31_AUDMUX_PORT6_SSI_PINS_6:
+ return "SSI6";
+ default:
+ return "UNKNOWN";
+ }
+}
+
+static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ ssize_t ret;
+ char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ int port = (int)file->private_data;
+ u32 pdcr, ptcr;
+
+ if (!buf)
+ return -ENOMEM;
+
+ if (audmux_clk)
+ clk_enable(audmux_clk);
+
+ ptcr = readl(audmux_base + MXC_AUDMUX_V2_PTCR(port));
+ pdcr = readl(audmux_base + MXC_AUDMUX_V2_PDCR(port));
+
+ if (audmux_clk)
+ clk_disable(audmux_clk);
+
+ ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
+ pdcr, ptcr);
+
+ if (ptcr & MXC_AUDMUX_V2_PTCR_TFSDIR)
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "TxFS output from %s, ",
+ audmux_port_string((ptcr >> 27) & 0x7));
+ else
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "TxFS input, ");
+
+ if (ptcr & MXC_AUDMUX_V2_PTCR_TCLKDIR)
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "TxClk output from %s",
+ audmux_port_string((ptcr >> 22) & 0x7));
+ else
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "TxClk input");
+
+ ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
+
+ if (ptcr & MXC_AUDMUX_V2_PTCR_SYN) {
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "Port is symmetric");
+ } else {
+ if (ptcr & MXC_AUDMUX_V2_PTCR_RFSDIR)
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "RxFS output from %s, ",
+ audmux_port_string((ptcr >> 17) & 0x7));
+ else
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "RxFS input, ");
+
+ if (ptcr & MXC_AUDMUX_V2_PTCR_RCLKDIR)
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "RxClk output from %s",
+ audmux_port_string((ptcr >> 12) & 0x7));
+ else
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "RxClk input");
+ }
+
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "\nData received from %s\n",
+ audmux_port_string((pdcr >> 13) & 0x7));
+
+ ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
+
+ kfree(buf);
+
+ return ret;
+}
+
+static const struct file_operations audmux_debugfs_fops = {
+ .open = audmux_open_file,
+ .read = audmux_read_file,
+};
+
+static void audmux_debugfs_init(void)
+{
+ int i;
+ char buf[20];
+
+ audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
+ if (!audmux_debugfs_root) {
+ pr_warning("Failed to create AUDMUX debugfs root\n");
+ return;
+ }
+
+ for (i = 1; i < 8; i++) {
+ snprintf(buf, sizeof(buf), "ssi%d", i);
+ if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
+ (void *)i, &audmux_debugfs_fops))
+ pr_warning("Failed to create AUDMUX port %d debugfs file\n",
+ i);
+ }
+}
+#else
+static inline void audmux_debugfs_init(void)
+{
+}
+#endif
+
int mxc_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
unsigned int pdcr)
{
@@ -68,6 +203,8 @@ static int mxc_audmux_v2_init(void)
if (cpu_is_mx31() || cpu_is_mx35())
audmux_base = IO_ADDRESS(AUDMUX_BASE_ADDR);
+ audmux_debugfs_init();
+
return 0;
}