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Message-Id: <4ec2e6b9477f346cc6e10f5c5079e0f4ca276a77.1406558450.git.stefan@agner.ch>
Date: Mon, 28 Jul 2014 16:57:31 +0200
From: Stefan Agner <stefan@...er.ch>
To: peter.chen@...escale.com, s.hauer@...gutronix.de,
shawn.guo@...escale.com
Cc: b35083@...escale.com, jingchang.lu@...escale.com,
linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org, stefan@...er.ch
Subject: [PATCH v2 5/7] chipidea: usbmisc_imx: Add USB support for VF610 SoCs
This adds Vybrid VF610 SoC support. The IP is very similar to i.MX6,
however, the non-core registers are spread in two different register
areas. Hence we support multiple instances of the USB misc driver
and add the driver instance to the imx_usbmisc_data structure.
Signed-off-by: Stefan Agner <stefan@...er.ch>
---
In the end, I decieded against the advice of Peter to integrate the
multi-instance functionality in a second driver. To support multiple
instances, I needed to extend the imx_usbmisc_data to point to the
instance. Since this is part of the ci_hdrc_imx driver, I feel it's
cleaner to extend the current driver rather to add a second driver
and implement two different handlings in the ci_hdrc_imx driver.
Also, the current approach has a slight advantage for current users
too: EPROBE_DEFER is returned earlier, when initializing the
imx_usbmisc_data structure rather than later on, when accessing
the driver by using imx_usbmisc_init/imx_usbmisc_init_post.
As a free bonus, this driver would now also support the mixed case:
multiple non-core registers in different areas which each support
multiple USB controllers...
Tell me if this is ok for you too.
.../devicetree/bindings/usb/usbmisc-imx.txt | 1 +
drivers/usb/chipidea/ci_hdrc_imx.c | 8 ++++
drivers/usb/chipidea/ci_hdrc_imx.h | 1 +
drivers/usb/chipidea/usbmisc_imx.c | 52 +++++++++++++++++-----
4 files changed, 51 insertions(+), 11 deletions(-)
diff --git a/Documentation/devicetree/bindings/usb/usbmisc-imx.txt b/Documentation/devicetree/bindings/usb/usbmisc-imx.txt
index 97ce94e..c101a4b 100644
--- a/Documentation/devicetree/bindings/usb/usbmisc-imx.txt
+++ b/Documentation/devicetree/bindings/usb/usbmisc-imx.txt
@@ -4,6 +4,7 @@ Required properties:
- #index-cells: Cells used to descibe usb controller index. Should be <1>
- compatible: Should be one of below:
"fsl,imx6q-usbmisc" for imx6q
+ "fsl,vf610-usbmisc" for Vybrid vf610
- reg: Should contain registers location and length
Examples:
diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
index 2e58f8d..9af12b4 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -54,6 +54,7 @@ struct ci_hdrc_imx_data {
static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev)
{
+ struct platform_device *misc_pdev;
struct device_node *np = dev->of_node;
struct of_phandle_args args;
struct imx_usbmisc_data *data;
@@ -79,8 +80,15 @@ static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev)
}
data->index = args.args[0];
+
+ misc_pdev = of_find_device_by_node(args.np);
of_node_put(args.np);
+ if (!misc_pdev)
+ return ERR_PTR(-EPROBE_DEFER);
+
+ data->dev = &misc_pdev->dev;
+
if (of_find_property(np, "disable-over-current", NULL))
data->disable_oc = 1;
diff --git a/drivers/usb/chipidea/ci_hdrc_imx.h b/drivers/usb/chipidea/ci_hdrc_imx.h
index 996ec93..4ed828f 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.h
+++ b/drivers/usb/chipidea/ci_hdrc_imx.h
@@ -13,6 +13,7 @@
#define __DRIVER_USB_CHIPIDEA_CI_HDRC_IMX_H
struct imx_usbmisc_data {
+ struct device *dev;
int index;
unsigned int disable_oc:1; /* over current detect disabled */
diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index 85293b8..926c997 100644
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -57,6 +57,8 @@
#define MX6_BM_OVER_CUR_DIS BIT(7)
+#define VF610_OVER_CUR_DIS BIT(7)
+
struct usbmisc_ops {
/* It's called once when probe a usb device */
int (*init)(struct imx_usbmisc_data *data);
@@ -71,10 +73,9 @@ struct imx_usbmisc {
const struct usbmisc_ops *ops;
};
-static struct imx_usbmisc *usbmisc;
-
static int usbmisc_imx25_init(struct imx_usbmisc_data *data)
{
+ struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
unsigned long flags;
u32 val = 0;
@@ -108,6 +109,7 @@ static int usbmisc_imx25_init(struct imx_usbmisc_data *data)
static int usbmisc_imx25_post(struct imx_usbmisc_data *data)
{
+ struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
void __iomem *reg;
unsigned long flags;
u32 val;
@@ -130,6 +132,7 @@ static int usbmisc_imx25_post(struct imx_usbmisc_data *data)
static int usbmisc_imx27_init(struct imx_usbmisc_data *data)
{
+ struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
unsigned long flags;
u32 val;
@@ -160,6 +163,7 @@ static int usbmisc_imx27_init(struct imx_usbmisc_data *data)
static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
{
+ struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
void __iomem *reg = NULL;
unsigned long flags;
u32 val = 0;
@@ -204,6 +208,7 @@ static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
static int usbmisc_imx6q_init(struct imx_usbmisc_data *data)
{
+ struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
unsigned long flags;
u32 reg;
@@ -221,6 +226,26 @@ static int usbmisc_imx6q_init(struct imx_usbmisc_data *data)
return 0;
}
+static int usbmisc_vf610_init(struct imx_usbmisc_data *data)
+{
+ struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
+ u32 reg;
+
+ /*
+ * Vybrid only has one misc register set, but in two different
+ * areas. These is reflected in two instances of this driver.
+ */
+ if (data->index >= 1)
+ return -EINVAL;
+
+ if (data->disable_oc) {
+ reg = readl(usbmisc->base);
+ writel(reg | VF610_OVER_CUR_DIS, usbmisc->base);
+ }
+
+ return 0;
+}
+
static const struct usbmisc_ops imx25_usbmisc_ops = {
.init = usbmisc_imx25_init,
.post = usbmisc_imx25_post,
@@ -238,10 +263,14 @@ static const struct usbmisc_ops imx6q_usbmisc_ops = {
.init = usbmisc_imx6q_init,
};
+static const struct usbmisc_ops vf610_usbmisc_ops = {
+ .init = usbmisc_vf610_init,
+};
+
int imx_usbmisc_init(struct imx_usbmisc_data *data)
{
- if (!usbmisc)
- return -EPROBE_DEFER;
+ struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
+
if (!usbmisc->ops->init)
return 0;
return usbmisc->ops->init(data);
@@ -250,8 +279,8 @@ EXPORT_SYMBOL_GPL(imx_usbmisc_init);
int imx_usbmisc_init_post(struct imx_usbmisc_data *data)
{
- if (!usbmisc)
- return -EPROBE_DEFER;
+ struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
+
if (!usbmisc->ops->post)
return 0;
return usbmisc->ops->post(data);
@@ -283,6 +312,10 @@ static const struct of_device_id usbmisc_imx_dt_ids[] = {
.compatible = "fsl,imx6q-usbmisc",
.data = &imx6q_usbmisc_ops,
},
+ {
+ .compatible = "fsl,vf610-usbmisc",
+ .data = &vf610_usbmisc_ops,
+ },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, usbmisc_imx_dt_ids);
@@ -294,9 +327,6 @@ static int usbmisc_imx_probe(struct platform_device *pdev)
int ret;
struct of_device_id *tmp_dev;
- if (usbmisc)
- return -EBUSY;
-
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
@@ -325,15 +355,15 @@ static int usbmisc_imx_probe(struct platform_device *pdev)
tmp_dev = (struct of_device_id *)
of_match_device(usbmisc_imx_dt_ids, &pdev->dev);
data->ops = (const struct usbmisc_ops *)tmp_dev->data;
- usbmisc = data;
+ platform_set_drvdata(pdev, data);
return 0;
}
static int usbmisc_imx_remove(struct platform_device *pdev)
{
+ struct imx_usbmisc *usbmisc = dev_get_drvdata(&pdev->dev);
clk_disable_unprepare(usbmisc->clk);
- usbmisc = NULL;
return 0;
}
--
2.0.2
--
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