[PATCH 06/10] MXS: Add imx-usb driver
Marek Vasut
marex at denx.de
Wed Apr 18 13:46:30 EDT 2012
This driver handles claiming of clocks and memory areas. These are later
properly delegated to it's child device, the USB Host.
Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Chen Peter-B29397 <B29397 at freescale.com>
Cc: Detlev Zundel <dzu at denx.de>
Cc: Fabio Estevam <festevam at gmail.com>
Cc: Li Frank-B20596 <B20596 at freescale.com>
Cc: Lin Tony-B19295 <B19295 at freescale.com>
Cc: Linux USB <linux-usb at vger.kernel.org>
Cc: Sascha Hauer <s.hauer at pengutronix.de>
Cc: Shawn Guo <shawn.guo at freescale.com>
Cc: Shawn Guo <shawn.guo at linaro.org>
Cc: Stefano Babic <sbabic at denx.de>
Cc: Subodh Nijsure <snijsure at grid-net.com>
Cc: Tony Lin <tony.lin at freescale.com>
Cc: Wolfgang Denk <wd at denx.de>
---
drivers/usb/otg/Kconfig | 6 ++
drivers/usb/otg/Makefile | 1 +
drivers/usb/otg/imx-usb.c | 226 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 233 insertions(+)
create mode 100644 drivers/usb/otg/imx-usb.c
diff --git a/drivers/usb/otg/Kconfig b/drivers/usb/otg/Kconfig
index 5c87db0..e7c6325 100644
--- a/drivers/usb/otg/Kconfig
+++ b/drivers/usb/otg/Kconfig
@@ -116,6 +116,12 @@ config FSL_USB2_OTG
help
Enable this to support Freescale USB OTG transceiver.
+config USB_IMX_COMPOSITE
+ bool
+ help
+ Composite driver that handles clock and memory mapping for
+ i.MX USB host and USB PHY.
+
config USB_MV_OTG
tristate "Marvell USB OTG support"
depends on USB_EHCI_MV && USB_MV_UDC && USB_SUSPEND
diff --git a/drivers/usb/otg/Makefile b/drivers/usb/otg/Makefile
index 41aa509..e3feaca 100644
--- a/drivers/usb/otg/Makefile
+++ b/drivers/usb/otg/Makefile
@@ -20,4 +20,5 @@ obj-$(CONFIG_USB_MSM_OTG) += msm_otg.o
obj-$(CONFIG_AB8500_USB) += ab8500-usb.o
fsl_usb2_otg-objs := fsl_otg.o otg_fsm.o
obj-$(CONFIG_FSL_USB2_OTG) += fsl_usb2_otg.o
+obj-$(CONFIG_USB_IMX_COMPOSITE) += imx-usb.o
obj-$(CONFIG_USB_MV_OTG) += mv_otg.o
diff --git a/drivers/usb/otg/imx-usb.c b/drivers/usb/otg/imx-usb.c
new file mode 100644
index 0000000..8e8af95
--- /dev/null
+++ b/drivers/usb/otg/imx-usb.c
@@ -0,0 +1,226 @@
+/*
+ * drivers/usb/otg/imx-usb.c
+ *
+ * Freescale i.MX USB composite driver.
+ *
+ * Copyright (C) 2012 Marek Vasut <marex at denx.de>
+ * on behalf of DENX Software Engineering GmbH
+ *
+ * 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/module.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/usb/otg.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/fsl_devices.h>
+#include <linux/io.h>
+
+#include <mach/common.h>
+#include <mach/hardware.h>
+#include <mach/devices-common.h>
+
+/*
+ * Allocate platform device with the DMA mask, this is borrowed from
+ * arch/arm/mach-mxs/devices.c
+ */
+static struct platform_device *__devinit add_platform_device(
+ const char *name, int id,
+ const void *data, size_t size_data, u64 dmamask)
+{
+ int ret = -ENOMEM;
+ struct platform_device *pdev;
+
+ pdev = platform_device_alloc(name, id);
+ if (!pdev)
+ goto err;
+
+ if (dmamask) {
+ /*
+ * This memory isn't freed when the device is put,
+ * I don't have a nice idea for that though. Conceptually
+ * dma_mask in struct device should not be a pointer.
+ * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
+ */
+ pdev->dev.dma_mask =
+ kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
+ if (!pdev->dev.dma_mask)
+ /* ret is still -ENOMEM; */
+ goto err;
+
+ *pdev->dev.dma_mask = dmamask;
+ pdev->dev.coherent_dma_mask = dmamask;
+ }
+
+ if (data) {
+ ret = platform_device_add_data(pdev, data, size_data);
+ if (ret)
+ goto err;
+ }
+
+ ret = platform_device_add(pdev);
+ if (ret) {
+err:
+ if (dmamask)
+ kfree(pdev->dev.dma_mask);
+ platform_device_put(pdev);
+ return ERR_PTR(ret);
+ }
+
+ return pdev;
+}
+
+static int __devinit imx_usb_probe(struct platform_device *pdev)
+{
+ struct imx_usb *data;
+ int ret;
+ void *retp = NULL;
+
+ /*
+ * Until further notice, this claims all necessary resources.
+ */
+
+ /* Allocate driver's private date. */
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+ if (!data) {
+ ret = -ENOMEM;
+ goto err_alloc_data;
+ }
+
+ /* Claim the Host clock. */
+ data->clk = clk_get(&pdev->dev, "usb");
+ if (IS_ERR(data->clk)) {
+ dev_err(&pdev->dev, "Failed to claim clock for USB Host\n");
+ ret = PTR_ERR(data->clk);
+ goto err_claim_host_clock;
+ }
+
+ /* Prepare Host clock. */
+ ret = clk_prepare(data->clk);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to prepare clock for USB Host.\n");
+ goto err_prepare_host_clock;
+ }
+
+ /* Get memory area for EHCI host from resources. */
+ data->mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!data->mem_res) {
+ dev_err(&pdev->dev, "Specify memory area for this USB Host!\n");
+ ret = -ENODEV;
+ goto err_get_host_resource;
+ }
+
+ /* Request the memory region for this USB Host. */
+ retp = devm_request_mem_region(&pdev->dev, data->mem_res->start,
+ resource_size(data->mem_res), pdev->name);
+ if (!retp) {
+ dev_err(&pdev->dev, "USB Host memory area already in use!\n");
+ ret = -EBUSY;
+ goto err_get_host_mem;
+ }
+
+ /* Map the memory region for USB Host. */
+ data->mem = devm_ioremap(&pdev->dev, data->mem_res->start,
+ resource_size(data->mem_res));
+ if (!data->mem) {
+ dev_err(&pdev->dev, "Memory mapping of USB Host failed!\n");
+ ret = -EFAULT;
+ goto err_map_host_mem;
+ }
+
+ /* Get IRQ for EHCI host from resources. */
+ data->irq = platform_get_irq(pdev, 0);
+ if (data->irq < 0) {
+ dev_err(&pdev->dev, "Specify IRQ for this USB Host!\n");
+ ret = -ENODEV;
+ goto err_get_host_irq;
+ }
+
+ /*
+ * Now finally probe the Host driver!
+ */
+ data->pdev = add_platform_device("mxs-ehci", -1, data, sizeof(*data),
+ DMA_BIT_MASK(32));
+ if (!data->pdev) {
+ dev_err(&pdev->dev, "Failed registering Host!\n");
+ ret = -ENODEV;
+ goto err_register_host;
+ }
+
+ return 0;
+
+err_register_host:
+err_get_host_irq:
+ iounmap(data->mem);
+err_map_host_mem:
+ release_mem_region(data->mem_res->start,
+ resource_size(data->mem_res));
+err_get_host_mem:
+ data->mem_res = NULL;
+err_get_host_resource:
+ clk_unprepare(data->clk);
+err_prepare_host_clock:
+ clk_put(data->clk);
+err_claim_host_clock:
+ kfree(data);
+err_alloc_data:
+ return ret;
+}
+
+static int __devexit imx_usb_remove(struct platform_device *pdev)
+{
+ struct imx_usb *data = platform_get_drvdata(pdev);
+
+ platform_device_unregister(data->pdev);
+
+ iounmap(data->mem);
+ release_mem_region(data->mem_res->start,
+ resource_size(data->mem_res));
+ data->mem_res = NULL;
+ clk_unprepare(data->clk);
+ clk_put(data->clk);
+ kfree(data);
+
+ return 0;
+}
+
+static struct platform_driver imx_usb_driver = {
+ .probe = imx_usb_probe,
+ .remove = __devexit_p(imx_usb_remove),
+ .driver = {
+ .name = "imx-usb",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init imx_usb_init(void)
+{
+ return platform_driver_register(&imx_usb_driver);
+}
+
+static void __exit imx_usb_exit(void)
+{
+ platform_driver_unregister(&imx_usb_driver);
+}
+
+module_init(imx_usb_init);
+module_exit(imx_usb_exit);
+
+MODULE_ALIAS("platform:imx-usb");
+MODULE_AUTHOR("Marek Vasut <marex at denx.de>");
+MODULE_DESCRIPTION("Freescale i.MX USB composite driver");
+MODULE_LICENSE("GPL");
--
1.7.9.5
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