linux/drivers/usb/host/ehci-ps3.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  PS3 EHCI Host Controller driver
 *
 *  Copyright (C) 2006 Sony Computer Entertainment Inc.
 *  Copyright 2006 Sony Corp.
 */

#include <asm/firmware.h>
#include <asm/ps3.h>

static void ps3_ehci_setup_insnreg(struct ehci_hcd *ehci)
{
	/* PS3 HC internal setup register offsets. */

	enum ps3_ehci_hc_insnreg {
		ps3_ehci_hc_insnreg01 = 0x084,
		ps3_ehci_hc_insnreg02 = 0x088,
		ps3_ehci_hc_insnreg03 = 0x08c,
	};

	/* PS3 EHCI HC errata fix 316 - The PS3 EHCI HC will reset its
	 * internal INSNREGXX setup regs back to the chip default values
	 * on Host Controller Reset (CMD_RESET) or Light Host Controller
	 * Reset (CMD_LRESET).  The work-around for this is for the HC
	 * driver to re-initialise these regs when ever the HC is reset.
	 */

	/* Set burst transfer counts to 256 out, 32 in. */

	writel_be(0x01000020, (void __iomem *)ehci->regs +
		ps3_ehci_hc_insnreg01);

	/* Enable burst transfer counts. */

	writel_be(0x00000001, (void __iomem *)ehci->regs +
		ps3_ehci_hc_insnreg03);
}

static int ps3_ehci_hc_reset(struct usb_hcd *hcd)
{
	int result;
	struct ehci_hcd *ehci = hcd_to_ehci(hcd);

	ehci->big_endian_mmio = 1;
	ehci->caps = hcd->regs;

	result = ehci_setup(hcd);
	if (result)
		return result;

	ps3_ehci_setup_insnreg(ehci);

	return result;
}

static const struct hc_driver ps3_ehci_hc_driver = {
	.description		= hcd_name,
	.product_desc		= "PS3 EHCI Host Controller",
	.hcd_priv_size		= sizeof(struct ehci_hcd),
	.irq			= ehci_irq,
	.flags			= HCD_MEMORY | HCD_DMA | HCD_USB2 | HCD_BH,
	.reset			= ps3_ehci_hc_reset,
	.start			= ehci_run,
	.stop			= ehci_stop,
	.shutdown		= ehci_shutdown,
	.urb_enqueue		= ehci_urb_enqueue,
	.urb_dequeue		= ehci_urb_dequeue,
	.endpoint_disable	= ehci_endpoint_disable,
	.endpoint_reset		= ehci_endpoint_reset,
	.get_frame_number	= ehci_get_frame,
	.hub_status_data	= ehci_hub_status_data,
	.hub_control		= ehci_hub_control,
#if defined(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 ps3_ehci_probe(struct ps3_system_bus_device *dev)
{
	int result;
	struct usb_hcd *hcd;
	unsigned int virq;
	static u64 dummy_mask;

	if (usb_disabled()) {
		result = -ENODEV;
		goto fail_start;
	}

	result = ps3_open_hv_device(dev);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: ps3_open_hv_device failed\n",
			__func__, __LINE__);
		goto fail_open;
	}

	result = ps3_dma_region_create(dev->d_region);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: ps3_dma_region_create failed: "
			"(%d)\n", __func__, __LINE__, result);
		BUG_ON("check region type");
		goto fail_dma_region;
	}

	result = ps3_mmio_region_create(dev->m_region);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: ps3_map_mmio_region failed\n",
			__func__, __LINE__);
		result = -EPERM;
		goto fail_mmio_region;
	}

	dev_dbg(&dev->core, "%s:%d: mmio mapped_addr %lxh\n", __func__,
		__LINE__, dev->m_region->lpar_addr);

	result = ps3_io_irq_setup(PS3_BINDING_CPU_ANY, dev->interrupt_id, &virq);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: ps3_construct_io_irq(%d) failed.\n",
			__func__, __LINE__, virq);
		result = -EPERM;
		goto fail_irq;
	}

	dummy_mask = DMA_BIT_MASK(32);
	dev->core.dma_mask = &dummy_mask;
	dma_set_coherent_mask(&dev->core, dummy_mask);

	hcd = usb_create_hcd(&ps3_ehci_hc_driver, &dev->core, dev_name(&dev->core));

	if (!hcd) {
		dev_dbg(&dev->core, "%s:%d: usb_create_hcd failed\n", __func__,
			__LINE__);
		result = -ENOMEM;
		goto fail_create_hcd;
	}

	hcd->rsrc_start = dev->m_region->lpar_addr;
	hcd->rsrc_len = dev->m_region->len;

	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name))
		dev_dbg(&dev->core, "%s:%d: request_mem_region failed\n",
			__func__, __LINE__);

	hcd->regs = ioremap(dev->m_region->lpar_addr, dev->m_region->len);

	if (!hcd->regs) {
		dev_dbg(&dev->core, "%s:%d: ioremap failed\n", __func__,
			__LINE__);
		result = -EPERM;
		goto fail_ioremap;
	}

	dev_dbg(&dev->core, "%s:%d: hcd->rsrc_start %lxh\n", __func__, __LINE__,
		(unsigned long)hcd->rsrc_start);
	dev_dbg(&dev->core, "%s:%d: hcd->rsrc_len   %lxh\n", __func__, __LINE__,
		(unsigned long)hcd->rsrc_len);
	dev_dbg(&dev->core, "%s:%d: hcd->regs       %lxh\n", __func__, __LINE__,
		(unsigned long)hcd->regs);
	dev_dbg(&dev->core, "%s:%d: virq            %lu\n", __func__, __LINE__,
		(unsigned long)virq);

	ps3_system_bus_set_drvdata(dev, hcd);

	result = usb_add_hcd(hcd, virq, 0);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: usb_add_hcd failed (%d)\n",
			__func__, __LINE__, result);
		goto fail_add_hcd;
	}

	device_wakeup_enable(hcd->self.controller);
	return result;

fail_add_hcd:
	iounmap(hcd->regs);
fail_ioremap:
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	usb_put_hcd(hcd);
fail_create_hcd:
	ps3_io_irq_destroy(virq);
fail_irq:
	ps3_free_mmio_region(dev->m_region);
fail_mmio_region:
	ps3_dma_region_free(dev->d_region);
fail_dma_region:
	ps3_close_hv_device(dev);
fail_open:
fail_start:
	return result;
}

static void ps3_ehci_remove(struct ps3_system_bus_device *dev)
{
	unsigned int tmp;
	struct usb_hcd *hcd = ps3_system_bus_get_drvdata(dev);

	BUG_ON(!hcd);

	dev_dbg(&dev->core, "%s:%d: regs %p\n", __func__, __LINE__, hcd->regs);
	dev_dbg(&dev->core, "%s:%d: irq %u\n", __func__, __LINE__, hcd->irq);

	tmp = hcd->irq;

	usb_remove_hcd(hcd);

	ps3_system_bus_set_drvdata(dev, NULL);

	BUG_ON(!hcd->regs);
	iounmap(hcd->regs);

	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	usb_put_hcd(hcd);

	ps3_io_irq_destroy(tmp);
	ps3_free_mmio_region(dev->m_region);

	ps3_dma_region_free(dev->d_region);
	ps3_close_hv_device(dev);
}

static int __init ps3_ehci_driver_register(struct ps3_system_bus_driver *drv)
{
	return firmware_has_feature(FW_FEATURE_PS3_LV1)
		? ps3_system_bus_driver_register(drv)
		: 0;
}

static void ps3_ehci_driver_unregister(struct ps3_system_bus_driver *drv)
{
	if (firmware_has_feature(FW_FEATURE_PS3_LV1))
		ps3_system_bus_driver_unregister(drv);
}

MODULE_ALIAS(PS3_MODULE_ALIAS_EHCI);

static struct ps3_system_bus_driver ps3_ehci_driver = {
	.core.name = "ps3-ehci-driver",
	.core.owner = THIS_MODULE,
	.match_id = PS3_MATCH_ID_EHCI,
	.probe = ps3_ehci_probe,
	.remove = ps3_ehci_remove,
	.shutdown = ps3_ehci_remove,
};