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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
commit76cb841cb886eef6b3bee341a2266c76578724ad (patch)
treef5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /drivers/usb/host/ohci-sm501.c
parentInitial commit. (diff)
downloadlinux-76cb841cb886eef6b3bee341a2266c76578724ad.tar.xz
linux-76cb841cb886eef6b3bee341a2266c76578724ad.zip
Adding upstream version 4.19.249.upstream/4.19.249
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/usb/host/ohci-sm501.c')
-rw-r--r--drivers/usb/host/ohci-sm501.c272
1 files changed, 272 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-sm501.c b/drivers/usb/host/ohci-sm501.c
new file mode 100644
index 000000000..0a39dc58f
--- /dev/null
+++ b/drivers/usb/host/ohci-sm501.c
@@ -0,0 +1,272 @@
+// SPDX-License-Identifier: GPL-1.0+
+/*
+ * OHCI HCD (Host Controller Driver) for USB.
+ *
+ * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
+ * (C) Copyright 2000-2005 David Brownell
+ * (C) Copyright 2002 Hewlett-Packard Company
+ * (C) Copyright 2008 Magnus Damm
+ *
+ * SM501 Bus Glue - based on ohci-omap.c
+ *
+ * This file is licenced under the GPL.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/sm501.h>
+#include <linux/sm501-regs.h>
+
+static int ohci_sm501_init(struct usb_hcd *hcd)
+{
+ return ohci_init(hcd_to_ohci(hcd));
+}
+
+static int ohci_sm501_start(struct usb_hcd *hcd)
+{
+ struct device *dev = hcd->self.controller;
+ int ret;
+
+ ret = ohci_run(hcd_to_ohci(hcd));
+ if (ret < 0) {
+ dev_err(dev, "can't start %s", hcd->self.bus_name);
+ ohci_stop(hcd);
+ }
+
+ return ret;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static const struct hc_driver ohci_sm501_hc_driver = {
+ .description = hcd_name,
+ .product_desc = "SM501 OHCI",
+ .hcd_priv_size = sizeof(struct ohci_hcd),
+
+ /*
+ * generic hardware linkage
+ */
+ .irq = ohci_irq,
+ .flags = HCD_USB11 | HCD_MEMORY | HCD_LOCAL_MEM,
+
+ /*
+ * basic lifecycle operations
+ */
+ .reset = ohci_sm501_init,
+ .start = ohci_sm501_start,
+ .stop = ohci_stop,
+ .shutdown = ohci_shutdown,
+
+ /*
+ * managing i/o requests and associated device resources
+ */
+ .urb_enqueue = ohci_urb_enqueue,
+ .urb_dequeue = ohci_urb_dequeue,
+ .endpoint_disable = ohci_endpoint_disable,
+
+ /*
+ * scheduling support
+ */
+ .get_frame_number = ohci_get_frame,
+
+ /*
+ * root hub support
+ */
+ .hub_status_data = ohci_hub_status_data,
+ .hub_control = ohci_hub_control,
+#ifdef CONFIG_PM
+ .bus_suspend = ohci_bus_suspend,
+ .bus_resume = ohci_bus_resume,
+#endif
+ .start_port_reset = ohci_start_port_reset,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int ohci_hcd_sm501_drv_probe(struct platform_device *pdev)
+{
+ const struct hc_driver *driver = &ohci_sm501_hc_driver;
+ struct device *dev = &pdev->dev;
+ struct resource *res, *mem;
+ int retval, irq;
+ struct usb_hcd *hcd = NULL;
+
+ irq = retval = platform_get_irq(pdev, 0);
+ if (retval < 0)
+ goto err0;
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (mem == NULL) {
+ dev_err(dev, "no resource definition for memory\n");
+ retval = -ENOENT;
+ goto err0;
+ }
+
+ if (!request_mem_region(mem->start, resource_size(mem), pdev->name)) {
+ dev_err(dev, "request_mem_region failed\n");
+ retval = -EBUSY;
+ goto err0;
+ }
+
+ /* The sm501 chip is equipped with local memory that may be used
+ * by on-chip devices such as the video controller and the usb host.
+ * This driver uses dma_declare_coherent_memory() to make sure
+ * usb allocations with dma_alloc_coherent() allocate from
+ * this local memory. The dma_handle returned by dma_alloc_coherent()
+ * will be an offset starting from 0 for the first local memory byte.
+ *
+ * So as long as data is allocated using dma_alloc_coherent() all is
+ * fine. This is however not always the case - buffers may be allocated
+ * using kmalloc() - so the usb core needs to be told that it must copy
+ * data into our local memory if the buffers happen to be placed in
+ * regular memory. The HCD_LOCAL_MEM flag does just that.
+ */
+
+ retval = dma_declare_coherent_memory(dev, mem->start,
+ mem->start - mem->parent->start,
+ resource_size(mem),
+ DMA_MEMORY_EXCLUSIVE);
+ if (retval) {
+ dev_err(dev, "cannot declare coherent memory\n");
+ goto err1;
+ }
+
+ /* allocate, reserve and remap resources for registers */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ dev_err(dev, "no resource definition for registers\n");
+ retval = -ENOENT;
+ goto err2;
+ }
+
+ hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
+ if (!hcd) {
+ retval = -ENOMEM;
+ goto err2;
+ }
+
+ hcd->rsrc_start = res->start;
+ hcd->rsrc_len = resource_size(res);
+
+ if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, pdev->name)) {
+ dev_err(dev, "request_mem_region failed\n");
+ retval = -EBUSY;
+ goto err3;
+ }
+
+ hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+ if (hcd->regs == NULL) {
+ dev_err(dev, "cannot remap registers\n");
+ retval = -ENXIO;
+ goto err4;
+ }
+
+ ohci_hcd_init(hcd_to_ohci(hcd));
+
+ retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
+ if (retval)
+ goto err5;
+ device_wakeup_enable(hcd->self.controller);
+
+ /* enable power and unmask interrupts */
+
+ sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
+ sm501_modify_reg(dev->parent, SM501_IRQ_MASK, 1 << 6, 0);
+
+ return 0;
+err5:
+ iounmap(hcd->regs);
+err4:
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err3:
+ usb_put_hcd(hcd);
+err2:
+ dma_release_declared_memory(dev);
+err1:
+ release_mem_region(mem->start, resource_size(mem));
+err0:
+ return retval;
+}
+
+static int ohci_hcd_sm501_drv_remove(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct resource *mem;
+
+ usb_remove_hcd(hcd);
+ iounmap(hcd->regs);
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+ usb_put_hcd(hcd);
+ dma_release_declared_memory(&pdev->dev);
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (mem)
+ release_mem_region(mem->start, resource_size(mem));
+
+ /* mask interrupts and disable power */
+
+ sm501_modify_reg(pdev->dev.parent, SM501_IRQ_MASK, 0, 1 << 6);
+ sm501_unit_power(pdev->dev.parent, SM501_GATE_USB_HOST, 0);
+
+ return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef CONFIG_PM
+static int ohci_sm501_suspend(struct platform_device *pdev, pm_message_t msg)
+{
+ struct device *dev = &pdev->dev;
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+ bool do_wakeup = device_may_wakeup(dev);
+ int ret;
+
+ if (time_before(jiffies, ohci->next_statechange))
+ msleep(5);
+ ohci->next_statechange = jiffies;
+
+ ret = ohci_suspend(hcd, do_wakeup);
+ if (ret)
+ return ret;
+
+ sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 0);
+ return ret;
+}
+
+static int ohci_sm501_resume(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+
+ if (time_before(jiffies, ohci->next_statechange))
+ msleep(5);
+ ohci->next_statechange = jiffies;
+
+ sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
+ ohci_resume(hcd, false);
+ return 0;
+}
+#else
+#define ohci_sm501_suspend NULL
+#define ohci_sm501_resume NULL
+#endif
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Driver definition to register with the SM501 bus
+ */
+static struct platform_driver ohci_hcd_sm501_driver = {
+ .probe = ohci_hcd_sm501_drv_probe,
+ .remove = ohci_hcd_sm501_drv_remove,
+ .shutdown = usb_hcd_platform_shutdown,
+ .suspend = ohci_sm501_suspend,
+ .resume = ohci_sm501_resume,
+ .driver = {
+ .name = "sm501-usb",
+ },
+};
+MODULE_ALIAS("platform:sm501-usb");