diff options
Diffstat (limited to 'drivers/usb/host/ehci-grlib.c')
| -rw-r--r-- | drivers/usb/host/ehci-grlib.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-grlib.c b/drivers/usb/host/ehci-grlib.c new file mode 100644 index 0000000000..14150e4d33 --- /dev/null +++ b/drivers/usb/host/ehci-grlib.c @@ -0,0 +1,177 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Driver for Aeroflex Gaisler GRLIB GRUSBHC EHCI host controller + * + * GRUSBHC is typically found on LEON/GRLIB SoCs + * + * (c) Jan Andersson <jan@gaisler.com> + * + * Based on ehci-ppc-of.c which is: + * (c) Valentine Barshak <vbarshak@ru.mvista.com> + * and in turn based on "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de> + * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com> + */ + +#include <linux/err.h> +#include <linux/signal.h> + +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> + +#define GRUSBHC_HCIVERSION 0x0100 /* Known value of cap. reg. HCIVERSION */ + +static const struct hc_driver ehci_grlib_hc_driver = { + .description = hcd_name, + .product_desc = "GRLIB GRUSBHC EHCI", + .hcd_priv_size = sizeof(struct ehci_hcd), + + /* + * generic hardware linkage + */ + .irq = ehci_irq, + .flags = HCD_MEMORY | HCD_DMA | HCD_USB2 | HCD_BH, + + /* + * basic lifecycle operations + */ + .reset = ehci_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, +#ifdef CONFIG_PM + .bus_suspend = ehci_bus_suspend, + .bus_resume = ehci_bus_resume, +#endif + .relinquish_port = ehci_relinquish_port, + .port_handed_over = ehci_port_handed_over, + + .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, +}; + + +static int ehci_hcd_grlib_probe(struct platform_device *op) +{ + struct device_node *dn = op->dev.of_node; + struct usb_hcd *hcd; + struct ehci_hcd *ehci = NULL; + struct resource res; + u32 hc_capbase; + int irq; + int rv; + + if (usb_disabled()) + return -ENODEV; + + dev_dbg(&op->dev, "initializing GRUSBHC EHCI USB Controller\n"); + + rv = of_address_to_resource(dn, 0, &res); + if (rv) + return rv; + + /* usb_create_hcd requires dma_mask != NULL */ + op->dev.dma_mask = &op->dev.coherent_dma_mask; + hcd = usb_create_hcd(&ehci_grlib_hc_driver, &op->dev, + "GRUSBHC EHCI USB"); + if (!hcd) + return -ENOMEM; + + hcd->rsrc_start = res.start; + hcd->rsrc_len = resource_size(&res); + + irq = irq_of_parse_and_map(dn, 0); + if (!irq) { + dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n", + __FILE__); + rv = -EBUSY; + goto err_irq; + } + + hcd->regs = devm_ioremap_resource(&op->dev, &res); + if (IS_ERR(hcd->regs)) { + rv = PTR_ERR(hcd->regs); + goto err_ioremap; + } + + ehci = hcd_to_ehci(hcd); + + ehci->caps = hcd->regs; + + /* determine endianness of this implementation */ + hc_capbase = ehci_readl(ehci, &ehci->caps->hc_capbase); + if (HC_VERSION(ehci, hc_capbase) != GRUSBHC_HCIVERSION) { + ehci->big_endian_mmio = 1; + ehci->big_endian_desc = 1; + ehci->big_endian_capbase = 1; + } + + rv = usb_add_hcd(hcd, irq, 0); + if (rv) + goto err_ioremap; + + device_wakeup_enable(hcd->self.controller); + return 0; + +err_ioremap: + irq_dispose_mapping(irq); +err_irq: + usb_put_hcd(hcd); + + return rv; +} + + +static void ehci_hcd_grlib_remove(struct platform_device *op) +{ + struct usb_hcd *hcd = platform_get_drvdata(op); + + dev_dbg(&op->dev, "stopping GRLIB GRUSBHC EHCI USB Controller\n"); + + usb_remove_hcd(hcd); + + irq_dispose_mapping(hcd->irq); + + usb_put_hcd(hcd); +} + + +static const struct of_device_id ehci_hcd_grlib_of_match[] = { + { + .name = "GAISLER_EHCI", + }, + { + .name = "01_026", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, ehci_hcd_grlib_of_match); + + +static struct platform_driver ehci_grlib_driver = { + .probe = ehci_hcd_grlib_probe, + .remove_new = ehci_hcd_grlib_remove, + .shutdown = usb_hcd_platform_shutdown, + .driver = { + .name = "grlib-ehci", + .of_match_table = ehci_hcd_grlib_of_match, + }, +}; |