usb: chipidea: add ahb burst configuration interface

The users can change it through dts or platform data if they
want to change the default value.

Signed-off-by: Peter Chen <peter.chen@freescale.com>

diff --git a/drivers/usb/chipidea/bits.h b/drivers/usb/chipidea/bits.h
index 831a8f6..462ad02 100644 (file)
--- a/drivers/usb/chipidea/bits.h
+++ b/drivers/usb/chipidea/bits.h
@@ -25,6 +25,9 @@
 #define VERSION                      (0xF << 25)
 #define CIVERSION            (0x7 << 29)
 
+/* SBUSCFG */
+#define AHBBRST_MASK           0x7
+
 /* HCCPARAMS */
 #define HCCPARAMS_LEN         BIT(17)
 

diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 7a2c217..ce04897 100644 (file)
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -438,6 +438,9 @@ void ci_platform_configure(struct ci_hdrc *ci)
 
        hw_write(ci, OP_USBCMD, 0xff0000, ci->platdata->itc_setting << 16);
 
+       if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
+               hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
+                       ci->platdata->ahb_burst_config);
 }
 
 /**
@@ -633,6 +636,17 @@ static int ci_get_platdata(struct device *dev,
                }
        }
 
+       if (of_find_property(dev->of_node, "ahb-burst-config", NULL)) {
+               ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
+                       &platdata->ahb_burst_config);
+               if (ret) {
+                       dev_err(dev,
+                               "failed to get ahb-burst-config\n");
+                       return ret;
+               }
+               platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
+       }
+
        return 0;
 }
 

diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
index 4d34a86..cd7fcad 100644 (file)
--- a/include/linux/usb/chipidea.h
+++ b/include/linux/usb/chipidea.h
@@ -33,6 +33,7 @@ struct ci_hdrc_platform_data {
 #define CI_HDRC_FORCE_FULLSPEED                BIT(6)
 #define CI_HDRC_TURN_VBUS_EARLY_ON     BIT(7)
 #define CI_HDRC_SET_NON_ZERO_TTHA      BIT(8)
+#define CI_HDRC_OVERRIDE_AHB_BURST     BIT(9)
        enum usb_dr_mode        dr_mode;
 #define CI_HDRC_CONTROLLER_RESET_EVENT         0
 #define CI_HDRC_CONTROLLER_STOPPED_EVENT       1
@@ -41,6 +42,7 @@ struct ci_hdrc_platform_data {
        bool                    tpl_support;
        /* interrupt threshold setting */
        u32                     itc_setting;
+       u32                     ahb_burst_config;
 };
 
 /* Default offset of capability registers */