usb: chipidea: add chipidea revision information

Define ci_get_revision API to know the controller revision
information according to chipidea 1.1a, 2.0a and 2.5a spec.
Besides, add one entry at struct ci_hdrc to indicate revision
information, it can be used for adding different code for
revisions, eg kinds of errata.

Reviewed-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/chipidea/bits.h b/drivers/usb/chipidea/bits.h
index ca57e3d..e69424d 100644 (file)
--- a/drivers/usb/chipidea/bits.h
+++ b/drivers/usb/chipidea/bits.h
@@ -15,6 +15,16 @@
 
 #include <linux/usb/ehci_def.h>
 
+/*
+ * ID
+ * For 1.x revision, bit24 - bit31 are reserved
+ * For 2.x revision, bit25 - bit28 are 0x2
+ */
+#define TAG                  (0x1F << 16)
+#define REVISION             (0xF << 21)
+#define VERSION                      (0xF << 25)
+#define CIVERSION            (0x7 << 29)
+
 /* HCCPARAMS */
 #define HCCPARAMS_LEN         BIT(17)
 

diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
index e53287a..c09381d 100644 (file)
--- a/drivers/usb/chipidea/ci.h
+++ b/drivers/usb/chipidea/ci.h
@@ -106,6 +106,18 @@ enum ci_role {
        CI_ROLE_END,
 };
 
+enum ci_revision {
+       CI_REVISION_1X = 10,    /* Revision 1.x */
+       CI_REVISION_20 = 20, /* Revision 2.0 */
+       CI_REVISION_21, /* Revision 2.1 */
+       CI_REVISION_22, /* Revision 2.2 */
+       CI_REVISION_23, /* Revision 2.3 */
+       CI_REVISION_24, /* Revision 2.4 */
+       CI_REVISION_25, /* Revision 2.5 */
+       CI_REVISION_25_PLUS, /* Revision above than 2.5 */
+       CI_REVISION_UNKNOWN = 99, /* Unknown Revision */
+};
+
 /**
  * struct ci_role_driver - host/gadget role driver
  * @start: start this role
@@ -181,6 +193,7 @@ struct hw_bank {
  * @supports_runtime_pm: if runtime pm is supported
  * @in_lpm: if the core in low power mode
  * @wakeup_int: if wakeup interrupt occur
+ * @rev: The revision number for controller
  */
 struct ci_hdrc {
        struct device                   *dev;
@@ -226,6 +239,7 @@ struct ci_hdrc {
        bool                            supports_runtime_pm;
        bool                            in_lpm;
        bool                            wakeup_int;
+       enum ci_revision                rev;
 };
 
 static inline struct ci_role_driver *ci_role(struct ci_hdrc *ci)

diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 2337354..4b22d7c 100644 (file)
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -137,6 +137,22 @@ static int hw_alloc_regmap(struct ci_hdrc *ci, bool is_lpm)
        return 0;
 }
 
+static enum ci_revision ci_get_revision(struct ci_hdrc *ci)
+{
+       int ver = hw_read_id_reg(ci, ID_ID, VERSION) >> __ffs(VERSION);
+       enum ci_revision rev = CI_REVISION_UNKNOWN;
+
+       if (ver == 0x2) {
+               rev = hw_read_id_reg(ci, ID_ID, REVISION)
+                       >> __ffs(REVISION);
+               rev += CI_REVISION_20;
+       } else if (ver == 0x0) {
+               rev = CI_REVISION_1X;
+       }
+
+       return rev;
+}
+
 /**
  * hw_read_intr_enable: returns interrupt enable register
  *
@@ -251,8 +267,11 @@ static int hw_device_init(struct ci_hdrc *ci, void __iomem *base)
        /* Clear all interrupts status bits*/
        hw_write(ci, OP_USBSTS, 0xffffffff, 0xffffffff);
 
-       dev_dbg(ci->dev, "ChipIdea HDRC found, lpm: %d; cap: %p op: %p\n",
-               ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op);
+       ci->rev = ci_get_revision(ci);
+
+       dev_dbg(ci->dev,
+               "ChipIdea HDRC found, revision: %d, lpm: %d; cap: %p op: %p\n",
+               ci->rev, ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op);
 
        /* setup lock mode ? */