This driver will handle i.MX233/i.MX28 and I hope soon i.MX6Q. I tried to keep
this separate from the MXC EHCI to avoid further polution of the MXC EHCI,
though eventually these two might be merged.
NOTE: I still haven't figured out how to enable/disable the disconnection
detector, it can't be enabled all the time, so I toggle PHY stuff from this
driver, which I doubt is correct.
Signed-off-by: Marek Vasut <marex@xxxxxxx>
Cc: Chen Peter-B29397 <B29397@xxxxxxxxxxxxx>
Cc: Detlev Zundel <dzu@xxxxxxx>
Cc: Fabio Estevam <festevam@xxxxxxxxx>
Cc: Li Frank-B20596 <B20596@xxxxxxxxxxxxx>
Cc: Lin Tony-B19295 <B19295@xxxxxxxxxxxxx>
Cc: Linux USB <linux-usb@xxxxxxxxxxxxxxx>
Cc: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Cc: Shawn Guo <shawn.guo@xxxxxxxxxxxxx>
Cc: Shawn Guo <shawn.guo@xxxxxxxxxx>
Cc: Stefano Babic <sbabic@xxxxxxx>
Cc: Subodh Nijsure <snijsure@xxxxxxxxxxxx>
Cc: Tony Lin <tony.lin@xxxxxxxxxxxxx>
Cc: Wolfgang Denk <wd@xxxxxxx>
---
drivers/usb/host/Kconfig | 7 ++
drivers/usb/host/ehci-hcd.c | 5 +
drivers/usb/host/ehci-mxs.c | 254 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 266 insertions(+)
create mode 100644 drivers/usb/host/ehci-mxs.c
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index f788eb8..85ed593 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -148,6 +148,13 @@ config USB_EHCI_MXC
---help---
Variation of ARC USB block used in some Freescale chips.
+config USB_EHCI_MXS
+ bool "Support for Freescale i.MX28 on-chip EHCI USB controller"
+ depends on USB_EHCI_HCD && ARCH_MXS
+ select USB_EHCI_ROOT_HUB_TT
+ ---help---
+ Enable USB support for i.MX28.
+
config USB_EHCI_HCD_OMAP
bool "EHCI support for OMAP3 and later chips"
depends on USB_EHCI_HCD && ARCH_OMAP
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 806cc95..d0df8be 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1263,6 +1263,11 @@ MODULE_LICENSE ("GPL");
#define PLATFORM_DRIVER ehci_mxc_driver
#endif
+#ifdef CONFIG_USB_EHCI_MXS
+#include "ehci-mxs.c"
+#define PLATFORM_DRIVER ehci_mxs_driver
+#endif
+
#ifdef CONFIG_USB_EHCI_SH
#include "ehci-sh.c"
#define PLATFORM_DRIVER ehci_hcd_sh_driver
diff --git a/drivers/usb/host/ehci-mxs.c b/drivers/usb/host/ehci-mxs.c
new file mode 100644
index 0000000..47e6502
--- /dev/null
+++ b/drivers/usb/host/ehci-mxs.c
@@ -0,0 +1,254 @@
+/*
+ * Freescale i.MX28 EHCI driver
+ *
+ * Copyright (c) 2012 Marek Vasut <marex@xxxxxxx>
+ * on behalf of DENX Software Engineering GmbH
+ *
+ * Based on MXC EHCI driver:
+ *
+ * Copyright (c) 2009 Daniel Mack <daniel@xxxxxxxx>
+ * Copyright (c) 2008 Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/usb/otg.h>
+#include <linux/usb/ulpi.h>
+#include <linux/slab.h>
+#include <linux/fsl_devices.h>
+
+#include <mach/hardware.h>
+#include <mach/devices-common.h>
+#include <mach/mx28.h>
+
+#include <asm/mach-types.h>
+
+#define MXC_EHCI_MODE_ULPI (2 << 30)
+
+/* Called during probe() after chip reset completes */
+static int ehci_mxs_setup(struct usb_hcd *hcd)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ int retval;
+
+ dbg_hcs_params(ehci, "reset");
+ dbg_hcc_params(ehci, "reset");
+
+ /* Cache this readonly data; minimize chip reads. */
+ ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
+
+ hcd->has_tt = 1;
+
+ retval = ehci_halt(ehci);
+ if (retval)
+ return retval;
+
+ /* Data structure init. */
+ retval = ehci_init(hcd);
+ if (retval)
+ return retval;
+
+ ehci->sbrn = 0x20;
+
+ ehci_reset(ehci);
+
+ ehci_port_power(ehci, 0);
+
+ return 0;
+}
+
+static irqreturn_t mxs_ehci_irq(struct usb_hcd *hcd)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ struct usb_phy *phy = usb_get_transceiver();
+ uint32_t status;
+ static uint32_t discon;
+
+ if (phy && phy->otg && phy->otg->set_vbus) {
+ status = ehci_readl(ehci, &ehci->regs->status);
+ status = !!(status & STS_PCD);
+ if (status != discon) {
+ discon = status;
+ phy->otg->set_vbus(phy->otg, status);
+ }
+ }
+
+ return ehci_irq(hcd);
+}
+
+static const struct hc_driver ehci_mxs_hc_driver = {
+ .description = hcd_name,
+ .product_desc = "Freescale i.MX28 On-Chip EHCI Host Controller",
+ .hcd_priv_size = sizeof(struct ehci_hcd),
+
+ /*
+ * Generic hardware linkage
+ */
+ .irq = mxs_ehci_irq,
+ .flags = HCD_USB2 | HCD_MEMORY,
+
+ /*
+ * Basic lifecycle operations
+ */
+ .reset = ehci_mxs_setup,
+ .start = ehci_run,
+ .stop = ehci_stop,
+ .shutdown = ehci_shutdown,
+
+ /*
+ * managing i/o requests and associated device resources
+ */
+ .urb_enqueue = ehci_urb_enqueue,
+ .urb_dequeue = ehci_urb_dequeue,
+ .endpoint_disable = ehci_endpoint_disable,
+ .endpoint_reset = ehci_endpoint_reset,
+
+ /*
+ * scheduling support
+ */
+ .get_frame_number = ehci_get_frame,
+
+ /*
+ * root hub support
+ */
+ .hub_status_data = ehci_hub_status_data,
+ .hub_control = ehci_hub_control,
+ .bus_suspend = ehci_bus_suspend,
+ .bus_resume = ehci_bus_resume,
+ .relinquish_port = ehci_relinquish_port,
+ .port_handed_over = ehci_port_handed_over,
+
+ .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
+};
+
+static int ehci_mxs_drv_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct imx_usb_data *data = pdev->dev.platform_data;
+ struct usb_hcd *hcd;
+ struct ehci_hcd *ehci;
+ struct usb_phy *phy;
+ int ret;
+
+ dev_info(dev, "Initializing i.MX28 USB Controller\n");
+
+ if (!data) {
+ dev_err(dev, "USB Host platform data missing!\n");
+ return -ENODEV;
+ }
+
+ /* Create HCD controller instance. */
+ hcd = usb_create_hcd(&ehci_mxs_hc_driver, dev, dev_name(dev));
+ if (!hcd) {
+ dev_err(dev, "Failed to create HCD instance!\n");
+ return -ENOMEM;
+ }
+
+ hcd->rsrc_start = data->mem_res->start;
+ hcd->rsrc_len = resource_size(data->mem_res);
+ hcd->regs = data->mem;
+
+ clk_enable(data->clk);
+
+ /* Wait for the controller to stabilize. */
+ mdelay(10);
+
+ /* Initialize the transceiver */
+#ifdef CONFIG_USB_OTG_UTILS
+ phy = usb_get_transceiver();
+ if (!phy) {
+ dev_err(dev, "Unable to find transceiver.\n");
+ ret = -ENODEV;
+ goto err_phy;
+ }
+
+ ret = usb_phy_init(phy);
+ if (ret < 0) {
+ dev_err(dev, "Unable init transceiver\n");
+ ret = -ENODEV;
+ goto err_phy_init;
+ }
+#else
+ dev_info(dev, "USB_MXS_PHY must have CONFIG_USB_OTG_UTILS enabled\n");
+ goto err_phy;
+#endif
+
+ ehci = hcd_to_ehci(hcd);
+
+ /* EHCI registers start at offset 0x100 */
+ ehci->caps = hcd->regs + 0x100;
+ ehci->regs = hcd->regs + 0x100 +
+ HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
+
+ /* Set up the PORTSCx register */
+ ehci_writel(ehci, MXC_EHCI_MODE_ULPI, &ehci->regs->port_status[0]);
+
+ platform_set_drvdata(pdev, hcd);
+
+ ret = usb_add_hcd(hcd, data->irq, IRQF_SHARED);
+ if (ret)
+ goto err_phy_init;
+
+ return 0;
+
+err_phy_init:
+#ifdef CONFIG_USB_OTG_UTILS
+ if (phy)
+ usb_put_transceiver(phy);
+#endif
+err_phy:
+ clk_disable(data->clk);
+ usb_put_hcd(hcd);
+ return ret;
+}
+
+static int __exit ehci_mxs_drv_remove(struct platform_device *pdev)
+{
+ struct imx_usb_data *data = pdev->dev.platform_data;
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct usb_phy *phy = usb_get_transceiver();
+
+ if (phy)
+ usb_phy_shutdown(phy);
+
+ usb_remove_hcd(hcd);
+ usb_put_hcd(hcd);
+ platform_set_drvdata(pdev, NULL);
+ clk_disable(data->clk);
+
+ return 0;
+}
+
+static void ehci_mxs_drv_shutdown(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+ if (hcd->driver->shutdown)
+ hcd->driver->shutdown(hcd);
+}
+
+static struct platform_driver ehci_mxs_driver = {
+ .probe = ehci_mxs_drv_probe,
+ .remove = __exit_p(ehci_mxs_drv_remove),
+ .shutdown = ehci_mxs_drv_shutdown,
+ .driver = {
+ .name = "mxs-ehci",
+ },
+};
+
+MODULE_ALIAS("platform:mxs-ehci");
--
1.7.9.5
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