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Subject[PATCH 2/3] usb: chipidea: Add chipidea revision information
Date
Define ci_get_revision API to know the controller revision
information according to chipidea 1.1a, 2.0a, 2.4 and 2.5a
spec. Besides, add one entry in struct ci_hdrc to indicate
revision information. This can be used for adding different
code for revisions, implementing erratas.

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
---
drivers/usb/chipidea/bits.h | 10 ++++++++++
drivers/usb/chipidea/core.c | 23 +++++++++++++++++++++--
2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/chipidea/bits.h b/drivers/usb/chipidea/bits.h
index ca57e3d..e935ccc 100644
--- 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/core.c b/drivers/usb/chipidea/core.c
index 9bdc6bd..33a8c4a 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -136,6 +136,22 @@ 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) {
+ int rev_reg = hw_read_id_reg
+ (ci, ID_ID, REVISION) >> __ffs(REVISION);
+ rev = rev_reg + CI_REVISION_20;
+ } else if (ver == 0x0) {
+ rev = CI_REVISION_1X;
+ }
+
+ return rev;
+}
+
/**
* hw_read_intr_enable: returns interrupt enable register
*
@@ -245,8 +261,11 @@ 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 ? */

--
1.7.9.5


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