d21daf1e90
The isp1760 driver registration function returns an error if USB is disabled. This made sense when the driver only supported host controllers, but now that it supports peripheral controllers host support isn't mandatory anymore. Fix this by returning an error only when both the HCD and UDC functions are disabled, either through the kernel configuration or at runtime. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
178 lines
4.8 KiB
C
178 lines
4.8 KiB
C
/*
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* Driver for the NXP ISP1760 chip
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*
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* Copyright 2014 Laurent Pinchart
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* Copyright 2007 Sebastian Siewior
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*
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* Contacts:
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* Sebastian Siewior <bigeasy@linutronix.de>
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* Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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#include "isp1760-core.h"
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#include "isp1760-hcd.h"
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#include "isp1760-regs.h"
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#include "isp1760-udc.h"
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static void isp1760_init_core(struct isp1760_device *isp)
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{
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u32 otgctrl;
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u32 hwmode;
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/* Low-level chip reset */
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if (isp->rst_gpio) {
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gpiod_set_value_cansleep(isp->rst_gpio, 1);
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mdelay(50);
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gpiod_set_value_cansleep(isp->rst_gpio, 0);
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}
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/*
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* Reset the host controller, including the CPU interface
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* configuration.
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*/
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isp1760_write32(isp->regs, HC_RESET_REG, SW_RESET_RESET_ALL);
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msleep(100);
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/* Setup HW Mode Control: This assumes a level active-low interrupt */
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hwmode = HW_DATA_BUS_32BIT;
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if (isp->devflags & ISP1760_FLAG_BUS_WIDTH_16)
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hwmode &= ~HW_DATA_BUS_32BIT;
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if (isp->devflags & ISP1760_FLAG_ANALOG_OC)
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hwmode |= HW_ANA_DIGI_OC;
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if (isp->devflags & ISP1760_FLAG_DACK_POL_HIGH)
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hwmode |= HW_DACK_POL_HIGH;
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if (isp->devflags & ISP1760_FLAG_DREQ_POL_HIGH)
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hwmode |= HW_DREQ_POL_HIGH;
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if (isp->devflags & ISP1760_FLAG_INTR_POL_HIGH)
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hwmode |= HW_INTR_HIGH_ACT;
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if (isp->devflags & ISP1760_FLAG_INTR_EDGE_TRIG)
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hwmode |= HW_INTR_EDGE_TRIG;
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/*
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* The ISP1761 has a dedicated DC IRQ line but supports sharing the HC
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* IRQ line for both the host and device controllers. Hardcode IRQ
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* sharing for now and disable the DC interrupts globally to avoid
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* spurious interrupts during HCD registration.
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*/
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if (isp->devflags & ISP1760_FLAG_ISP1761) {
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isp1760_write32(isp->regs, DC_MODE, 0);
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hwmode |= HW_COMN_IRQ;
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}
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/*
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* We have to set this first in case we're in 16-bit mode.
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* Write it twice to ensure correct upper bits if switching
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* to 16-bit mode.
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*/
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isp1760_write32(isp->regs, HC_HW_MODE_CTRL, hwmode);
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isp1760_write32(isp->regs, HC_HW_MODE_CTRL, hwmode);
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/*
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* PORT 1 Control register of the ISP1760 is the OTG control register
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* on ISP1761.
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*
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* TODO: Really support OTG. For now we configure port 1 in device mode
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* when OTG is requested.
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*/
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if ((isp->devflags & ISP1760_FLAG_ISP1761) &&
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(isp->devflags & ISP1760_FLAG_OTG_EN))
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otgctrl = ((HW_DM_PULLDOWN | HW_DP_PULLDOWN) << 16)
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| HW_OTG_DISABLE;
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else
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otgctrl = (HW_SW_SEL_HC_DC << 16)
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| (HW_VBUS_DRV | HW_SEL_CP_EXT);
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isp1760_write32(isp->regs, HC_PORT1_CTRL, otgctrl);
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dev_info(isp->dev, "bus width: %u, oc: %s\n",
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isp->devflags & ISP1760_FLAG_BUS_WIDTH_16 ? 16 : 32,
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isp->devflags & ISP1760_FLAG_ANALOG_OC ? "analog" : "digital");
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}
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void isp1760_set_pullup(struct isp1760_device *isp, bool enable)
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{
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isp1760_write32(isp->regs, HW_OTG_CTRL_SET,
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enable ? HW_DP_PULLUP : HW_DP_PULLUP << 16);
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}
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int isp1760_register(struct resource *mem, int irq, unsigned long irqflags,
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struct device *dev, unsigned int devflags)
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{
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struct isp1760_device *isp;
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bool udc_disabled = !(devflags & ISP1760_FLAG_ISP1761);
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int ret;
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/*
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* If neither the HCD not the UDC is enabled return an error, as no
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* device would be registered.
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*/
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if ((!IS_ENABLED(CONFIG_USB_ISP1760_HCD) || usb_disabled()) &&
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(!IS_ENABLED(CONFIG_USB_ISP1761_UDC) || udc_disabled))
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return -ENODEV;
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/* prevent usb-core allocating DMA pages */
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dev->dma_mask = NULL;
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isp = devm_kzalloc(dev, sizeof(*isp), GFP_KERNEL);
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if (!isp)
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return -ENOMEM;
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isp->dev = dev;
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isp->devflags = devflags;
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isp->rst_gpio = devm_gpiod_get_optional(dev, NULL, GPIOD_OUT_HIGH);
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if (IS_ERR(isp->rst_gpio))
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return PTR_ERR(isp->rst_gpio);
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isp->regs = devm_ioremap_resource(dev, mem);
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if (IS_ERR(isp->regs))
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return PTR_ERR(isp->regs);
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isp1760_init_core(isp);
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if (IS_ENABLED(CONFIG_USB_ISP1760_HCD) && !usb_disabled()) {
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ret = isp1760_hcd_register(&isp->hcd, isp->regs, mem, irq,
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irqflags | IRQF_SHARED, dev);
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if (ret < 0)
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return ret;
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}
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if (IS_ENABLED(CONFIG_USB_ISP1761_UDC) && !udc_disabled) {
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ret = isp1760_udc_register(isp, irq, irqflags | IRQF_SHARED |
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IRQF_DISABLED);
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if (ret < 0) {
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isp1760_hcd_unregister(&isp->hcd);
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return ret;
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}
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}
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dev_set_drvdata(dev, isp);
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return 0;
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}
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void isp1760_unregister(struct device *dev)
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{
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struct isp1760_device *isp = dev_get_drvdata(dev);
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isp1760_udc_unregister(isp);
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isp1760_hcd_unregister(&isp->hcd);
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}
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MODULE_DESCRIPTION("Driver for the ISP1760 USB-controller from NXP");
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MODULE_AUTHOR("Sebastian Siewior <bigeasy@linuxtronix.de>");
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MODULE_LICENSE("GPL v2");
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