80b4a0f8fe
The IRQF_DISABLED is a NOOP and scheduled to be removed. According to
commit e58aa3d2d0 ("genirq: Run irq handlers with interrupts
disabled") running IRQ handlers with interrupts enabled can cause stack
overflows when the interrupt line of the issuing device is still active.
This patch removes using this deprecated flag and additionally removes
redundantly setting IRQF_SHARED for isp1760_udc_register().
Signed-off-by: Valentin Rothberg <Valentin.Rothberg@lip6.fr>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
177 lines
4.7 KiB
C
177 lines
4.7 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);
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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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