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Date: Fri, 7 Oct 2016 18:42:52 +0200
From: ahaslam@...libre.com
To: gregkh@...uxfoundation.org, robh+dt@...nel.org, nsekhar@...com,
stern@...land.harvard.edu, khilman@...libre.com,
sshtylyov@...mvista.com, david@...hnology.com
Cc: linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Axel Haslam <ahaslam@...libre.com>
Subject: [PATCH/RFT 07/12] USB: ohci-da8xx: Request gpios and handle interrupt in the driver
From: Axel Haslam <ahaslam@...libre.com>
Currently requesting the vbus and overcurrent gpio is handled on
the board specific file. But this does not play well moving to
device tree.
In preparation to migrate to a device tree boot, handle requesting
gpios and overcurrent interrupt on the usb driver itself, thus avoiding
callbacks to arch/mach*
Signed-off-by: Axel Haslam <ahaslam@...libre.com>
---
arch/arm/mach-davinci/board-da830-evm.c | 71 ++---------------------
arch/arm/mach-davinci/board-omapl138-hawk.c | 11 ----
drivers/usb/host/ohci-da8xx.c | 90 +++++++++++++++++++++++------
include/linux/platform_data/usb-davinci.h | 16 +++--
4 files changed, 82 insertions(+), 106 deletions(-)
diff --git a/arch/arm/mach-davinci/board-da830-evm.c b/arch/arm/mach-davinci/board-da830-evm.c
index 8d126e4..cfba9fa 100644
--- a/arch/arm/mach-davinci/board-da830-evm.c
+++ b/arch/arm/mach-davinci/board-da830-evm.c
@@ -47,62 +47,15 @@ static const short da830_evm_usb11_pins[] = {
-1
};
-static da8xx_ocic_handler_t da830_evm_usb_ocic_handler;
-
-static int da830_evm_usb_set_power(unsigned port, int on)
-{
- gpio_set_value(ON_BD_USB_DRV, on);
- return 0;
-}
-
-static int da830_evm_usb_get_power(unsigned port)
-{
- return gpio_get_value(ON_BD_USB_DRV);
-}
-
-static int da830_evm_usb_get_oci(unsigned port)
-{
- return !gpio_get_value(ON_BD_USB_OVC);
-}
-
-static irqreturn_t da830_evm_usb_ocic_irq(int, void *);
-
-static int da830_evm_usb_ocic_notify(da8xx_ocic_handler_t handler)
-{
- int irq = gpio_to_irq(ON_BD_USB_OVC);
- int error = 0;
-
- if (handler != NULL) {
- da830_evm_usb_ocic_handler = handler;
-
- error = request_irq(irq, da830_evm_usb_ocic_irq,
- IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
- "OHCI over-current indicator", NULL);
- if (error)
- pr_err("%s: could not request IRQ to watch over-current indicator changes\n",
- __func__);
- } else
- free_irq(irq, NULL);
-
- return error;
-}
-
static struct da8xx_ohci_platform_data da830_evm_usb11_pdata = {
- .set_power = da830_evm_usb_set_power,
- .get_power = da830_evm_usb_get_power,
- .get_oci = da830_evm_usb_get_oci,
- .ocic_notify = da830_evm_usb_ocic_notify,
-
+ .gpio_vbus = ON_BD_USB_DRV,
+ .gpio_overcurrent = ON_BD_USB_OVC,
+ .flags = (DA8XX_OHCI_FLAG_GPIO_VBUS
+ | DA8XX_OHCI_FLAG_GPIO_OCI),
/* TPS2065 switch @ 5V */
.potpgt = 3, /* 3 ms max */
};
-static irqreturn_t da830_evm_usb_ocic_irq(int irq, void *dev_id)
-{
- da830_evm_usb_ocic_handler(&da830_evm_usb11_pdata, 1);
- return IRQ_HANDLED;
-}
-
static __init void da830_evm_usb_init(void)
{
int ret;
@@ -143,22 +96,6 @@ static __init void da830_evm_usb_init(void)
return;
}
- ret = gpio_request(ON_BD_USB_DRV, "ON_BD_USB_DRV");
- if (ret) {
- pr_err("%s: failed to request GPIO for USB 1.1 port power control: %d\n",
- __func__, ret);
- return;
- }
- gpio_direction_output(ON_BD_USB_DRV, 0);
-
- ret = gpio_request(ON_BD_USB_OVC, "ON_BD_USB_OVC");
- if (ret) {
- pr_err("%s: failed to request GPIO for USB 1.1 port over-current indicator: %d\n",
- __func__, ret);
- return;
- }
- gpio_direction_input(ON_BD_USB_OVC);
-
ret = da8xx_register_usb11(&da830_evm_usb11_pdata);
if (ret)
pr_warn("%s: USB 1.1 registration failed: %d\n", __func__, ret);
diff --git a/arch/arm/mach-davinci/board-omapl138-hawk.c b/arch/arm/mach-davinci/board-omapl138-hawk.c
index 075be1b..8d72bc1 100644
--- a/arch/arm/mach-davinci/board-omapl138-hawk.c
+++ b/arch/arm/mach-davinci/board-omapl138-hawk.c
@@ -178,11 +178,6 @@ static __init void omapl138_hawk_mmc_init(void)
gpio_free(DA850_HAWK_MMCSD_CD_PIN);
}
-static const short da850_hawk_usb11_pins[] = {
- DA850_GPIO2_4, DA850_GPIO6_13,
- -1
-};
-
static struct da8xx_ohci_platform_data omapl138_hawk_usb11_pdata = {
/* TPS2087 switch @ 5V */
.potpgt = 3 /* 3 ms max */
@@ -192,12 +187,6 @@ static __init void omapl138_hawk_usb_init(void)
{
int ret;
- ret = davinci_cfg_reg_list(da850_hawk_usb11_pins);
- if (ret) {
- pr_warn("%s: USB 1.1 PinMux setup failed: %d\n", __func__, ret);
- return;
- }
-
/* USB_REFCLKIN is not used. */
ret = da8xx_register_usb20_phy_clk(false);
if (ret)
diff --git a/drivers/usb/host/ohci-da8xx.c b/drivers/usb/host/ohci-da8xx.c
index 9d9f8e3..d7a0f11 100644
--- a/drivers/usb/host/ohci-da8xx.c
+++ b/drivers/usb/host/ohci-da8xx.c
@@ -17,6 +17,7 @@
#include <linux/clk.h>
#include <linux/phy/phy.h>
#include <linux/platform_data/usb-davinci.h>
+#include <linux/gpio.h>
#ifndef CONFIG_ARCH_DAVINCI_DA8XX
#error "This file is DA8xx bus glue. Define CONFIG_ARCH_DAVINCI_DA8XX."
@@ -61,6 +62,24 @@ static void ohci_da8xx_disable(void)
clk_disable_unprepare(usb11_clk);
}
+
+static int ohci_da8xx_set_power(struct da8xx_ohci_platform_data *pdata,
+ int on)
+{
+ gpio_set_value(pdata->gpio_vbus, on);
+ return 0;
+}
+
+static int ohci_da8xx_get_power(struct da8xx_ohci_platform_data *pdata)
+{
+ return gpio_get_value(pdata->gpio_vbus);
+}
+
+static int ohci_da8xx_get_oci(struct da8xx_ohci_platform_data *pdata)
+{
+ return !gpio_get_value(pdata->gpio_overcurrent);
+}
+
/*
* Handle the port over-current indicator change.
*/
@@ -70,8 +89,18 @@ static void ohci_da8xx_ocic_handler(struct da8xx_ohci_platform_data *pdata,
ocic_mask |= 1 << port;
/* Once over-current is detected, the port needs to be powered down */
- if (pdata->get_oci(port) > 0)
- pdata->set_power(port, 0);
+ if (ohci_da8xx_get_oci(pdata) > 0)
+ ohci_da8xx_set_power(pdata, 0);
+}
+
+static irqreturn_t ohci_da8xx_ocic_irq(int irq, void *data)
+{
+ struct platform_device *pdev = (struct platform_device *) data;
+ struct da8xx_ohci_platform_data *pdata = dev_get_platdata(&pdev->dev);
+
+ ohci_da8xx_ocic_handler(pdata, 1);
+
+ return IRQ_HANDLED;
}
static int ohci_da8xx_init(struct usb_hcd *hcd)
@@ -107,11 +136,11 @@ static int ohci_da8xx_init(struct usb_hcd *hcd)
* the correct hub descriptor...
*/
rh_a = ohci_readl(ohci, &ohci->regs->roothub.a);
- if (pdata->set_power) {
+ if (pdata->flags & DA8XX_OHCI_FLAG_GPIO_VBUS) {
rh_a &= ~RH_A_NPS;
rh_a |= RH_A_PSM;
}
- if (pdata->get_oci) {
+ if (pdata->flags & DA8XX_OHCI_FLAG_GPIO_OCI) {
rh_a &= ~RH_A_NOCP;
rh_a |= RH_A_OCPM;
}
@@ -185,11 +214,13 @@ static int ohci_da8xx_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
temp = roothub_portstatus(hcd_to_ohci(hcd), wIndex - 1);
/* The port power status (PPS) bit defaults to 1 */
- if (pdata->get_power && pdata->get_power(wIndex) == 0)
+ if ((pdata->flags & DA8XX_OHCI_FLAG_GPIO_VBUS)
+ && ohci_da8xx_get_power(pdata) == 0)
temp &= ~RH_PS_PPS;
/* The port over-current indicator (POCI) bit is always 0 */
- if (pdata->get_oci && pdata->get_oci(wIndex) > 0)
+ if ((pdata->flags & DA8XX_OHCI_FLAG_GPIO_OCI)
+ && ohci_da8xx_get_oci(pdata) > 0)
temp |= RH_PS_POCI;
/* The over-current indicator change (OCIC) bit is 0 too */
@@ -214,10 +245,10 @@ static int ohci_da8xx_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
dev_dbg(dev, "%sPortFeature(%u): %s\n",
temp ? "Set" : "Clear", wIndex, "POWER");
- if (!pdata->set_power)
+ if (!(pdata->flags & DA8XX_OHCI_FLAG_GPIO_VBUS))
return 0;
- return pdata->set_power(wIndex, temp) ? -EPIPE : 0;
+ return ohci_da8xx_set_power(pdata, temp) ? -EPIPE : 0;
case USB_PORT_FEAT_C_OVER_CURRENT:
dev_dbg(dev, "%sPortFeature(%u): %s\n",
temp ? "Set" : "Clear", wIndex,
@@ -314,6 +345,38 @@ static int usb_hcd_da8xx_probe(const struct hc_driver *driver,
return PTR_ERR(usb11_phy);
}
+
+ if (pdata->flags & DA8XX_OHCI_FLAG_GPIO_VBUS) {
+ error = devm_gpio_request_one(&pdev->dev,
+ pdata->gpio_vbus,
+ GPIOF_DIR_OUT, "usb11 vbus");
+ if (error) {
+ pr_err("could not request vbus gpio: %d\n", error);
+ return error;
+ }
+ }
+
+ if (pdata->flags & DA8XX_OHCI_FLAG_GPIO_OCI) {
+ error = devm_gpio_request_one(&pdev->dev,
+ pdata->gpio_overcurrent,
+ GPIOF_DIR_IN, "usb11 oci");
+ if (error) {
+ pr_err("could not request oci gpio: %d\n", error);
+ return error;
+ }
+
+ error = devm_request_irq(&pdev->dev,
+ gpio_to_irq(pdata->gpio_overcurrent),
+ ohci_da8xx_ocic_irq,
+ IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING,
+ "ohci overcurrent indicator", pdev);
+ if (error) {
+ pr_err("could not request oci irq: %d\n", error);
+ return error;
+ }
+ }
+
hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
if (!hcd)
return -ENOMEM;
@@ -341,15 +404,7 @@ static int usb_hcd_da8xx_probe(const struct hc_driver *driver,
device_wakeup_enable(hcd->self.controller);
- if (pdata->ocic_notify) {
- error = pdata->ocic_notify(ohci_da8xx_ocic_handler);
- if (error)
- goto err_notify;
- }
-
return 0;
-err_notify:
- usb_remove_hcd(hcd);
err:
usb_put_hcd(hcd);
return error;
@@ -367,9 +422,6 @@ static int usb_hcd_da8xx_probe(const struct hc_driver *driver,
static inline void
usb_hcd_da8xx_remove(struct usb_hcd *hcd, struct platform_device *pdev)
{
- struct da8xx_ohci_platform_data *pdata = dev_get_platdata(&pdev->dev);
-
- pdata->ocic_notify(NULL);
usb_remove_hcd(hcd);
usb_put_hcd(hcd);
}
diff --git a/include/linux/platform_data/usb-davinci.h b/include/linux/platform_data/usb-davinci.h
index dffe3bf..b72f703 100644
--- a/include/linux/platform_data/usb-davinci.h
+++ b/include/linux/platform_data/usb-davinci.h
@@ -41,17 +41,15 @@ typedef void (*da8xx_ocic_handler_t)(struct da8xx_ohci_platform_data *pdata,
/* Passed as the platform data to the OHCI driver */
struct da8xx_ohci_platform_data {
- /* Switch the port power on/off */
- int (*set_power)(unsigned port, int on);
- /* Read the port power status */
- int (*get_power)(unsigned port);
- /* Read the port over-current indicator */
- int (*get_oci)(unsigned port);
- /* Over-current indicator change notification (pass NULL to disable) */
- int (*ocic_notify)(da8xx_ocic_handler_t handler);
-
/* Time from power on to power good (in 2 ms units) */
u8 potpgt;
+
+ u32 flags;
+#define DA8XX_OHCI_FLAG_GPIO_VBUS (1 << 0)
+#define DA8XX_OHCI_FLAG_GPIO_OCI (1 << 1)
+
+ int gpio_vbus;
+ int gpio_overcurrent;
};
void davinci_setup_usb(unsigned mA, unsigned potpgt_ms);
--
2.7.1
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