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Date: Mon, 22 Jul 2013 20:09:53 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: balbi@...com, george.cherian@...com,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH 02/16] usb: phy: phy-nop: add support for am335x PHY
The am335x PHY code is well hidden in multiple places. The glue layer
uses the nop and does up/down in the background. This patch copies the
power on / power off part out of dsps so it can be removed later in
dsps. At this point I am not sure if it is better to write a new phy
driver for am335x or just add the missing pieces to this one.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
drivers/usb/phy/phy-nop.c | 114 +++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 102 insertions(+), 12 deletions(-)
diff --git a/drivers/usb/phy/phy-nop.c b/drivers/usb/phy/phy-nop.c
index 55445e5d..7c84eec 100644
--- a/drivers/usb/phy/phy-nop.c
+++ b/drivers/usb/phy/phy-nop.c
@@ -35,6 +35,7 @@
#include <linux/clk.h>
#include <linux/regulator/consumer.h>
#include <linux/of.h>
+#include <linux/of_address.h>
struct nop_usb_xceiv {
struct usb_phy phy;
@@ -42,6 +43,14 @@ struct nop_usb_xceiv {
struct clk *clk;
struct regulator *vcc;
struct regulator *reset;
+
+ void __iomem *priv_reg;
+};
+
+struct phy_data {
+ int (*phy_init)(struct usb_phy *x);
+ void (*phy_shutdown)(struct usb_phy *x);
+ int (*reg_init)(struct platform_device *pdev);
};
static struct platform_device *pd;
@@ -139,10 +148,85 @@ static int nop_set_host(struct usb_otg *otg, struct usb_bus *host)
return 0;
}
+static int am335x_reg_init(struct platform_device *pdev)
+{
+ struct device_node *node = pdev->dev.of_node;
+ struct nop_usb_xceiv *nop;
+ struct resource res;
+ int ret;
+
+ nop = platform_get_drvdata(pdev);
+ ret = of_address_to_resource(node, 0, &res);
+ if (ret)
+ return ret;
+
+ nop->priv_reg = devm_request_and_ioremap(&pdev->dev, &res);
+ if (!nop->priv_reg)
+ return -EINVAL;
+ return 0;
+}
+
+#define AM335X_USB_CTRL 0x00
+#define AM335x_USB_STS 0x04
+
+#define USBPHY_CM_PWRDN (1 << 0)
+#define USBPHY_OTG_PWRDN (1 << 1)
+#define USBPHY_OTGVDET_EN (1 << 19)
+#define USBPHY_OTGSESSEND_EN (1 << 20)
+
+static void am335x_phy_power(struct nop_usb_xceiv *nop, bool on)
+{
+ u32 val;
+
+ val = readl(nop->priv_reg);
+ if (on) {
+ val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
+ val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
+ } else {
+ val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
+ }
+
+ writel(val, nop->priv_reg);
+}
+
+static int am335x_phy_init(struct usb_phy *phy)
+{
+ struct nop_usb_xceiv *nop = dev_get_drvdata(phy->dev);
+ int ret;
+
+ ret = nop_init(phy);
+ if (ret)
+ return ret;
+ am335x_phy_power(nop, true);
+ return 0;
+}
+
+static void am335x_phy_shutdown(struct usb_phy *phy)
+{
+ struct nop_usb_xceiv *nop = dev_get_drvdata(phy->dev);
+
+ am335x_phy_power(nop, false);
+ nop_shutdown(phy);
+}
+
+struct phy_data am335x_phy_data = {
+ .reg_init = am335x_reg_init,
+ .phy_init = am335x_phy_init,
+ .phy_shutdown = am335x_phy_shutdown,
+};
+
+static const struct of_device_id nop_xceiv_dt_ids[] = {
+ { .compatible = "usb-nop-xceiv" },
+ { .compatible = "ti,am335x-usb-phy", .data = &am335x_phy_data },
+ { }
+};
+MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids);
+
static int nop_usb_xceiv_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct nop_usb_xceiv_platform_data *pdata = pdev->dev.platform_data;
+ const struct phy_data *phy_data = NULL;
struct nop_usb_xceiv *nop;
enum usb_phy_type type = USB_PHY_TYPE_USB2;
int err;
@@ -154,6 +238,7 @@ static int nop_usb_xceiv_probe(struct platform_device *pdev)
if (!nop)
return -ENOMEM;
+ platform_set_drvdata(pdev, nop);
nop->phy.otg = devm_kzalloc(&pdev->dev, sizeof(*nop->phy.otg),
GFP_KERNEL);
if (!nop->phy.otg)
@@ -161,13 +246,20 @@ static int nop_usb_xceiv_probe(struct platform_device *pdev)
if (dev->of_node) {
struct device_node *node = dev->of_node;
+ const struct of_device_id *of_id;
if (of_property_read_u32(node, "clock-frequency", &clk_rate))
clk_rate = 0;
needs_vcc = of_property_read_bool(node, "vcc-supply");
needs_reset = of_property_read_bool(node, "reset-supply");
-
+ of_id = of_match_node(nop_xceiv_dt_ids, node);
+ if (of_id) {
+ phy_data = of_id->data;
+ err = phy_data->reg_init(pdev);
+ if (err)
+ return err;
+ }
} else if (pdata) {
type = pdata->type;
clk_rate = pdata->clk_rate;
@@ -217,8 +309,15 @@ static int nop_usb_xceiv_probe(struct platform_device *pdev)
nop->phy.dev = nop->dev;
nop->phy.label = "nop-xceiv";
nop->phy.set_suspend = nop_set_suspend;
- nop->phy.init = nop_init;
- nop->phy.shutdown = nop_shutdown;
+ if (phy_data && phy_data->phy_init)
+ nop->phy.init = phy_data->phy_init;
+ else
+ nop->phy.init = nop_init;
+
+ if (phy_data && phy_data->phy_shutdown)
+ nop->phy.shutdown = phy_data->phy_shutdown;
+ else
+ nop->phy.shutdown = nop_shutdown;
nop->phy.state = OTG_STATE_UNDEFINED;
nop->phy.type = type;
@@ -233,8 +332,6 @@ static int nop_usb_xceiv_probe(struct platform_device *pdev)
goto err_add;
}
- platform_set_drvdata(pdev, nop);
-
ATOMIC_INIT_NOTIFIER_HEAD(&nop->phy.notifier);
return 0;
@@ -257,13 +354,6 @@ static int nop_usb_xceiv_remove(struct platform_device *pdev)
return 0;
}
-static const struct of_device_id nop_xceiv_dt_ids[] = {
- { .compatible = "usb-nop-xceiv" },
- { }
-};
-
-MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids);
-
static struct platform_driver nop_usb_xceiv_driver = {
.probe = nop_usb_xceiv_probe,
.remove = nop_usb_xceiv_remove,
--
1.8.3.2
--
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