usb: musb: dsps, debugfs files

debugfs files to show the contents of important dsps registers.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
index 68c14e1eac66e79534b1e9335baaad3f25e77fea..3372ded5def79853e75ac79ecc66b74d73c63542 100644 (file)
--- a/drivers/usb/musb/musb_dsps.c
+++ b/drivers/usb/musb/musb_dsps.c
@@ -45,6 +45,8 @@
 #include <linux/of_irq.h>
 #include <linux/usb/of.h>
 
+#include <linux/debugfs.h>
+
 #include "musb_core.h"
 
 static const struct of_device_id musb_dsps_of_match[];
@@ -136,6 +138,26 @@ struct dsps_glue {
        unsigned long last_timer;    /* last timer data for each instance */
 
        struct dsps_context context;
+       struct debugfs_regset32 regset;
+       struct dentry *dbgfs_root;
+};
+
+static const struct debugfs_reg32 dsps_musb_regs[] = {
+       { "revision",           0x00 },
+       { "control",            0x14 },
+       { "status",             0x18 },
+       { "eoi",                0x24 },
+       { "intr0_stat",         0x30 },
+       { "intr1_stat",         0x34 },
+       { "intr0_set",          0x38 },
+       { "intr1_set",          0x3c },
+       { "txmode",             0x70 },
+       { "rxmode",             0x74 },
+       { "autoreq",            0xd0 },
+       { "srpfixtime",         0xd4 },
+       { "tdown",              0xd8 },
+       { "phy_utmi",           0xe0 },
+       { "mode",               0xe8 },
 };
 
 static void dsps_musb_try_idle(struct musb *musb, unsigned long timeout)
@@ -368,6 +390,30 @@ out:
        return ret;
 }
 
+static int dsps_musb_dbg_init(struct musb *musb, struct dsps_glue *glue)
+{
+       struct dentry *root;
+       struct dentry *file;
+       char buf[128];
+
+       sprintf(buf, "%s.dsps", dev_name(musb->controller));
+       root = debugfs_create_dir(buf, NULL);
+       if (!root)
+               return -ENOMEM;
+       glue->dbgfs_root = root;
+
+       glue->regset.regs = dsps_musb_regs;
+       glue->regset.nregs = ARRAY_SIZE(dsps_musb_regs);
+       glue->regset.base = musb->ctrl_base;
+
+       file = debugfs_create_regset32("regdump", S_IRUGO, root, &glue->regset);
+       if (!file) {
+               debugfs_remove_recursive(root);
+               return -ENOMEM;
+       }
+       return 0;
+}
+
 static int dsps_musb_init(struct musb *musb)
 {
        struct device *dev = musb->controller;
@@ -377,6 +423,7 @@ static int dsps_musb_init(struct musb *musb)
        void __iomem *reg_base;
        struct resource *r;
        u32 rev, val;
+       int ret;
 
        r = platform_get_resource_byname(parent, IORESOURCE_MEM, "control");
        if (!r)
@@ -410,6 +457,10 @@ static int dsps_musb_init(struct musb *musb)
        val &= ~(1 << wrp->otg_disable);
        dsps_writel(musb->ctrl_base, wrp->phy_utmi, val);
 
+       ret = dsps_musb_dbg_init(musb, glue);
+       if (ret)
+               return ret;
+
        return 0;
 }
 
@@ -656,6 +707,9 @@ static int dsps_remove(struct platform_device *pdev)
        /* disable usbss clocks */
        pm_runtime_put(&pdev->dev);
        pm_runtime_disable(&pdev->dev);
+
+       debugfs_remove_recursive(glue->dbgfs_root);
+
        return 0;
 }