/* * EHCI HCD (Host Controller Driver) for USB. * * (C) Copyright 1999 Roman Weissgaerber * (C) Copyright 2000-2002 David Brownell * (C) Copyright 2002 Hewlett-Packard Company * * Bus Glue for Ikanos IKF71XX * * Written by Christopher Hoover * Based on fragments of previous driver by Rusell King et al. * * Modified for LH7A404 from ohci-sa1111.c * by Durgesh Pattamatta * Modified for AMD Alchemy Au1xxx * by Matt Porter * Modified for IKANOS IKF71XX * by Kiran Kumar CSK * * This file is licenced under the GPL. */ /** * Some part of this file is modified by Ikanos Communications. * * Copyright (C) 2013-2014 Ikanos Communications. */ #include #include #include extern int usb_disabled(void); static unsigned char fusiv_usb_enable; /* USB PHY Reset sequence, UTMI configuration */ static void do_phy_reset (void) { /* * UTMI PHY port 0 & 1 reset, POR and register reset * Enable big-endian for transactions data , INCR4/8/16 xfers, * start on burst boundaries, AP_START_CLOCK is on */ *USB_GNL_REG_1 = 0x2FFFF; udelay(1000); /* Deassert PHY Reset */ *USB_GNL_REG_1 = 0x2FFFE; udelay(1000); /* Deassert POR & port resets */ *USB_GNL_REG_1 = 0x2FFF0; udelay(1000); } /* Bring up the UTMI PHY, host controller */ static void ikf71xx_start_ehci_hc(struct platform_device *dev) { volatile uint regval = 0; pr_debug(__FILE__ ": starting VX185 EHCI USB Controller\n"); /* Should not issue reset if OHCI driver has already done it */ if ((fusiv_usb_enable & FUSIV_USB_OHCI_ON) == 0) { printk("EHCI: Enabling USB clocks and USB PHY reset\n"); /* Enable USB clock */ regval = scu_regs->clk_gate_ctl; if (!(regval & (0x1 << USB_CLK_GATE))) { regval |= (0x1 << USB_CLK_GATE); scu_regs->clk_gate_ctl = regval; } /* Enable USB clock PLL Post Div 3 Register */ regval = scu_regs->pll_pd3_ctl; if (!(regval & (0x1 << USB_CLK_PLL_PDIV3))) { regval |= (0x1 << USB_CLK_PLL_PDIV3); scu_regs->pll_pd3_ctl = regval; } /* Unmask USB reset */ regval = scu_regs->rst_mask; if (regval & (0x1 << USB_RESET)) { regval &= ~(0x1 << USB_RESET); scu_regs->rst_mask = regval; } /* Assert USB reset */ regval = scu_regs->rst_vec; if (!(regval & (0x1 << USB_RESET))) { regval |= (0x1 << USB_RESET); scu_regs->rst_vec = regval; } udelay(1000); /* Mask USB reset back */ regval = scu_regs->rst_mask; if (!(regval & (0x1 << USB_RESET))) { regval |= (0x1 << USB_RESET); scu_regs->rst_mask = regval; } /* UTMI PHY reset */ do_phy_reset(); } } /* Disable host controller */ static void ikf71xx_stop_ehci_hc(struct platform_device *dev) { volatile uint regval = 0; pr_debug(__FILE__ ": stopping IKF71XX EHCI USB Controller\n"); if ((fusiv_usb_enable & FUSIV_USB_OHCI_ON) == 0) { /* Disable USB clock PLL Post Div 3 Register */ regval = scu_regs->pll_pd3_ctl; if (regval & (0x1 << USB_CLK_PLL_PDIV3)) { regval &= ~(0x1 << USB_CLK_PLL_PDIV3); scu_regs->pll_pd3_ctl = regval; } /* Disable USB clock */ regval = scu_regs->clk_gate_ctl; if (regval & (0x1 << USB_CLK_GATE)) { regval &= ~(0x1 << USB_CLK_GATE); scu_regs->clk_gate_ctl = regval; } } } /*-------------------------------------------------------------------------*/ /* configure so an HC device and id are always provided */ /* always called with process context; sleeping is OK */ /** * usb_hcd_ikf71xx_probe - initialize Au1xxx-based HCDs * Context: !in_interrupt() * * Allocates basic resources for this USB host controller, and * then invokes the start() method for the HCD associated with it * through the hotplug entry's driver_data. * */ int usb_hcd_ikf71xx_ehci_probe (const struct hc_driver *driver, struct platform_device *dev) { int retval = 0; struct usb_hcd *hcd; struct ehci_hcd *ehci; pr_debug(__FILE__ ": Probing USB EHCI \n"); ikf71xx_start_ehci_hc(dev); /* offset 1 contains IRQ info */ if(dev->resource[1].flags != IORESOURCE_IRQ) { pr_debug ("resource[2] is not IORESOURCE_IRQ"); return -ENOMEM; } hcd = usb_create_hcd(driver, &dev->dev, "ikf71xx ehci"); if (!hcd) return -ENOMEM; /* offset 0 contains EHCI info */ hcd->rsrc_start = dev->resource[0].start; hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1; if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { pr_debug("request_mem_region failed"); retval = -EBUSY; goto err1; } hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); if (!hcd->regs) { pr_debug("ioremap failed"); retval = -ENOMEM; goto err2; } ehci = hcd_to_ehci(hcd); ehci->caps = hcd->regs; ehci->regs = hcd->regs + HC_LENGTH(ehci,readl(&ehci->caps->hc_capbase)); /* cache this readonly data; minimize chip reads */ ehci->hcs_params = readl(&ehci->caps->hcs_params); /* Convert QH/QTD descriptors to big-endian */ ehci->big_endian_desc = 1; #if (defined (CONFIG_FUSIV_VX185) || defined(CONFIG_FUSIV_VX585)) && defined (CONFIG_CPU_MIPSR2_IRQ_VI) retval = usb_add_hcd(hcd, dev->resource[1].start, IRQF_SHARED | IRQF_DISABLED ); #else retval = usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED | IRQF_SAMPLE_RANDOM); #endif if (retval == 0) { fusiv_usb_enable |= FUSIV_USB_EHCI_ON; return retval; } ikf71xx_stop_ehci_hc(dev); iounmap(hcd->regs); err2: release_mem_region(hcd->rsrc_start, hcd->rsrc_len); err1: usb_put_hcd(hcd); return retval; } /* may be called without controller electrically present */ /* may be called with controller, bus, and devices active */ /** * usb_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs * @dev: USB Host Controller being removed * Context: !in_interrupt() * * Reverses the effect of usb_hcd_ikf71xx_probe(), first invoking * the HCD's stop() method. It is always called from a thread * context, normally "rmmod", "apmd", or something similar. * */ void usb_hcd_ikf71xx_echi_remove (struct usb_hcd *hcd, struct platform_device *dev) { usb_remove_hcd(hcd); pr_debug("stopping IKF71XX EHCI USB Controller\n"); ikf71xx_stop_ehci_hc(dev); iounmap(hcd->regs); release_mem_region(hcd->rsrc_start, hcd->rsrc_len); usb_put_hcd(hcd); fusiv_usb_enable &= ~FUSIV_USB_EHCI_ON; } /*-------------------------------------------------------------------------*/ static const struct hc_driver ehci_ikf71xx_hc_driver = { .description = hcd_name, .product_desc = "Ikanos On-Chip EHCI Host Controller", .hcd_priv_size = sizeof(struct ehci_hcd), /* * generic hardware linkage */ .irq = ehci_irq, .flags = HCD_MEMORY | HCD_USB2, /* * basic lifecycle operations */ .reset = ehci_init, .start = ehci_run, .stop = ehci_stop, /* * managing i/o requests and associated device resources */ .urb_enqueue = ehci_urb_enqueue, .urb_dequeue = ehci_urb_dequeue, .endpoint_disable = ehci_endpoint_disable, /* * 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 }; /*-------------------------------------------------------------------------*/ static int ehci_hcd_ikf71xx_drv_probe(struct platform_device *pdev) { pr_debug("In ehci_hcd_ikf71xx_drv_probe\n"); if (usb_disabled()) return -ENODEV; return usb_hcd_ikf71xx_ehci_probe(&ehci_ikf71xx_hc_driver, pdev); } static int ehci_hcd_ikf71xx_drv_remove(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); pr_debug ("In ehci_hcd_ikf71xx_drv_remove\n"); usb_hcd_ikf71xx_echi_remove(hcd, pdev); return 0; } MODULE_ALIAS("ikf71xx-ehci-hcd"); static struct platform_driver ehci_hcd_ikf71xx_driver = { .probe = ehci_hcd_ikf71xx_drv_probe, .remove = ehci_hcd_ikf71xx_drv_remove, .driver = { .name = "fusiv-ehci-hcd", .bus = &platform_bus_type, } };