174 lines
4.6 KiB
C
174 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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#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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msleep(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);
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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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