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path: root/drivers/usb/musb/ux500.c
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Diffstat (limited to 'drivers/usb/musb/ux500.c')
-rw-r--r--drivers/usb/musb/ux500.c200
1 files changed, 185 insertions, 15 deletions
diff --git a/drivers/usb/musb/ux500.c b/drivers/usb/musb/ux500.c
index 13a39291376..f202e508846 100644
--- a/drivers/usb/musb/ux500.c
+++ b/drivers/usb/musb/ux500.c
@@ -21,14 +21,22 @@
#include <linux/module.h>
#include <linux/kernel.h>
-#include <linux/init.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
+#include <linux/of.h>
#include <linux/platform_device.h>
+#include <linux/usb/musb-ux500.h>
#include "musb_core.h"
+static struct musb_hdrc_config ux500_musb_hdrc_config = {
+ .multipoint = true,
+ .dyn_fifo = true,
+ .num_eps = 16,
+ .ram_bits = 16,
+};
+
struct ux500_glue {
struct device *dev;
struct platform_device *musb;
@@ -36,6 +44,98 @@ struct ux500_glue {
};
#define glue_to_musb(g) platform_get_drvdata(g->musb)
+static void ux500_musb_set_vbus(struct musb *musb, int is_on)
+{
+ u8 devctl;
+ unsigned long timeout = jiffies + msecs_to_jiffies(1000);
+ /* HDRC controls CPEN, but beware current surges during device
+ * connect. They can trigger transient overcurrent conditions
+ * that must be ignored.
+ */
+
+ devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
+
+ if (is_on) {
+ if (musb->xceiv->state == OTG_STATE_A_IDLE) {
+ /* start the session */
+ devctl |= MUSB_DEVCTL_SESSION;
+ musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
+ /*
+ * Wait for the musb to set as A device to enable the
+ * VBUS
+ */
+ while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) {
+
+ if (time_after(jiffies, timeout)) {
+ dev_err(musb->controller,
+ "configured as A device timeout");
+ break;
+ }
+ }
+
+ } else {
+ musb->is_active = 1;
+ musb->xceiv->otg->default_a = 1;
+ musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
+ devctl |= MUSB_DEVCTL_SESSION;
+ MUSB_HST_MODE(musb);
+ }
+ } else {
+ musb->is_active = 0;
+
+ /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping
+ * right to B_IDLE...
+ */
+ musb->xceiv->otg->default_a = 0;
+ devctl &= ~MUSB_DEVCTL_SESSION;
+ MUSB_DEV_MODE(musb);
+ }
+ musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
+
+ /*
+ * Devctl values will be updated after vbus goes below
+ * session_valid. The time taken depends on the capacitance
+ * on VBUS line. The max discharge time can be upto 1 sec
+ * as per the spec. Typically on our platform, it is 200ms
+ */
+ if (!is_on)
+ mdelay(200);
+
+ dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",
+ usb_otg_state_string(musb->xceiv->state),
+ musb_readb(musb->mregs, MUSB_DEVCTL));
+}
+
+static int musb_otg_notifications(struct notifier_block *nb,
+ unsigned long event, void *unused)
+{
+ struct musb *musb = container_of(nb, struct musb, nb);
+
+ dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n",
+ event, usb_otg_state_string(musb->xceiv->state));
+
+ switch (event) {
+ case UX500_MUSB_ID:
+ dev_dbg(musb->controller, "ID GND\n");
+ ux500_musb_set_vbus(musb, 1);
+ break;
+ case UX500_MUSB_VBUS:
+ dev_dbg(musb->controller, "VBUS Connect\n");
+ break;
+ case UX500_MUSB_NONE:
+ dev_dbg(musb->controller, "VBUS Disconnect\n");
+ if (is_host_active(musb))
+ ux500_musb_set_vbus(musb, 0);
+ else
+ musb->xceiv->state = OTG_STATE_B_IDLE;
+ break;
+ default:
+ dev_dbg(musb->controller, "ID float\n");
+ return NOTIFY_DONE;
+ }
+ return NOTIFY_OK;
+}
+
static irqreturn_t ux500_musb_interrupt(int irq, void *__hci)
{
unsigned long flags;
@@ -58,12 +158,21 @@ static irqreturn_t ux500_musb_interrupt(int irq, void *__hci)
static int ux500_musb_init(struct musb *musb)
{
+ int status;
+
musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
if (IS_ERR_OR_NULL(musb->xceiv)) {
pr_err("HS USB OTG: no transceiver configured\n");
return -EPROBE_DEFER;
}
+ musb->nb.notifier_call = musb_otg_notifications;
+ status = usb_register_notifier(musb->xceiv, &musb->nb);
+ if (status < 0) {
+ dev_dbg(musb->controller, "notification register failed\n");
+ return status;
+ }
+
musb->isr = ux500_musb_interrupt;
return 0;
@@ -71,6 +180,8 @@ static int ux500_musb_init(struct musb *musb)
static int ux500_musb_exit(struct musb *musb)
{
+ usb_unregister_notifier(musb->xceiv, &musb->nb);
+
usb_put_phy(musb->xceiv);
return 0;
@@ -79,16 +190,62 @@ static int ux500_musb_exit(struct musb *musb)
static const struct musb_platform_ops ux500_ops = {
.init = ux500_musb_init,
.exit = ux500_musb_exit,
+
+ .set_vbus = ux500_musb_set_vbus,
};
+static struct musb_hdrc_platform_data *
+ux500_of_probe(struct platform_device *pdev, struct device_node *np)
+{
+ struct musb_hdrc_platform_data *pdata;
+ const char *mode;
+ int strlen;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return NULL;
+
+ mode = of_get_property(np, "dr_mode", &strlen);
+ if (!mode) {
+ dev_err(&pdev->dev, "No 'dr_mode' property found\n");
+ return NULL;
+ }
+
+ if (strlen > 0) {
+ if (!strcmp(mode, "host"))
+ pdata->mode = MUSB_HOST;
+ if (!strcmp(mode, "otg"))
+ pdata->mode = MUSB_OTG;
+ if (!strcmp(mode, "peripheral"))
+ pdata->mode = MUSB_PERIPHERAL;
+ }
+
+ return pdata;
+}
+
static int ux500_probe(struct platform_device *pdev)
{
- struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data;
+ struct resource musb_resources[2];
+ struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ struct device_node *np = pdev->dev.of_node;
struct platform_device *musb;
struct ux500_glue *glue;
struct clk *clk;
int ret = -ENOMEM;
+ if (!pdata) {
+ if (np) {
+ pdata = ux500_of_probe(pdev, np);
+ if (!pdata)
+ goto err0;
+
+ pdev->dev.platform_data = pdata;
+ } else {
+ dev_err(&pdev->dev, "no pdata or device tree found\n");
+ goto err0;
+ }
+ }
+
glue = kzalloc(sizeof(*glue), GFP_KERNEL);
if (!glue) {
dev_err(&pdev->dev, "failed to allocate glue context\n");
@@ -101,7 +258,7 @@ static int ux500_probe(struct platform_device *pdev)
goto err1;
}
- clk = clk_get(&pdev->dev, "usb");
+ clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "failed to get clock\n");
ret = PTR_ERR(clk);
@@ -115,7 +272,7 @@ static int ux500_probe(struct platform_device *pdev)
}
musb->dev.parent = &pdev->dev;
- musb->dev.dma_mask = pdev->dev.dma_mask;
+ musb->dev.dma_mask = &pdev->dev.coherent_dma_mask;
musb->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
glue->dev = &pdev->dev;
@@ -123,11 +280,25 @@ static int ux500_probe(struct platform_device *pdev)
glue->clk = clk;
pdata->platform_ops = &ux500_ops;
+ pdata->config = &ux500_musb_hdrc_config;
platform_set_drvdata(pdev, glue);
- ret = platform_device_add_resources(musb, pdev->resource,
- pdev->num_resources);
+ memset(musb_resources, 0x00, sizeof(*musb_resources) *
+ ARRAY_SIZE(musb_resources));
+
+ musb_resources[0].name = pdev->resource[0].name;
+ musb_resources[0].start = pdev->resource[0].start;
+ musb_resources[0].end = pdev->resource[0].end;
+ musb_resources[0].flags = pdev->resource[0].flags;
+
+ musb_resources[1].name = pdev->resource[1].name;
+ musb_resources[1].start = pdev->resource[1].start;
+ musb_resources[1].end = pdev->resource[1].end;
+ musb_resources[1].flags = pdev->resource[1].flags;
+
+ ret = platform_device_add_resources(musb, musb_resources,
+ ARRAY_SIZE(musb_resources));
if (ret) {
dev_err(&pdev->dev, "failed to add resources\n");
goto err5;
@@ -203,23 +374,22 @@ static int ux500_resume(struct device *dev)
return 0;
}
+#endif
-static const struct dev_pm_ops ux500_pm_ops = {
- .suspend = ux500_suspend,
- .resume = ux500_resume,
-};
+static SIMPLE_DEV_PM_OPS(ux500_pm_ops, ux500_suspend, ux500_resume);
-#define DEV_PM_OPS (&ux500_pm_ops)
-#else
-#define DEV_PM_OPS NULL
-#endif
+static const struct of_device_id ux500_match[] = {
+ { .compatible = "stericsson,db8500-musb", },
+ {}
+};
static struct platform_driver ux500_driver = {
.probe = ux500_probe,
.remove = ux500_remove,
.driver = {
.name = "musb-ux500",
- .pm = DEV_PM_OPS,
+ .pm = &ux500_pm_ops,
+ .of_match_table = ux500_match,
},
};
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 03:16:37 +0000