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/*
* Driver for the NXP ISP1760 chip
*
* Copyright 2014 Laurent Pinchart
* Copyright 2007 Sebastian Siewior
*
* Contacts:
* Sebastian Siewior <bigeasy@linutronix.de>
* Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*/
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include "isp1760-core.h"
#include "isp1760-hcd.h"
#include "isp1760-regs.h"
static void isp1760_init_core(struct isp1760_device *isp)
{
u32 hwmode;
/* Low-level chip reset */
if (isp->rst_gpio) {
gpiod_set_value_cansleep(isp->rst_gpio, 1);
mdelay(50);
gpiod_set_value_cansleep(isp->rst_gpio, 0);
}
/*
* Reset the host controller, including the CPU interface
* configuration.
*/
isp1760_write32(isp->regs, HC_RESET_REG, SW_RESET_RESET_ALL);
msleep(100);
/* Setup HW Mode Control: This assumes a level active-low interrupt */
hwmode = HW_DATA_BUS_32BIT;
if (isp->devflags & ISP1760_FLAG_BUS_WIDTH_16)
hwmode &= ~HW_DATA_BUS_32BIT;
if (isp->devflags & ISP1760_FLAG_ANALOG_OC)
hwmode |= HW_ANA_DIGI_OC;
if (isp->devflags & ISP1760_FLAG_DACK_POL_HIGH)
hwmode |= HW_DACK_POL_HIGH;
if (isp->devflags & ISP1760_FLAG_DREQ_POL_HIGH)
hwmode |= HW_DREQ_POL_HIGH;
if (isp->devflags & ISP1760_FLAG_INTR_POL_HIGH)
hwmode |= HW_INTR_HIGH_ACT;
if (isp->devflags & ISP1760_FLAG_INTR_EDGE_TRIG)
hwmode |= HW_INTR_EDGE_TRIG;
/*
* We have to set this first in case we're in 16-bit mode.
* Write it twice to ensure correct upper bits if switching
* to 16-bit mode.
*/
isp1760_write32(isp->regs, HC_HW_MODE_CTRL, hwmode);
isp1760_write32(isp->regs, HC_HW_MODE_CTRL, hwmode);
/*
* PORT 1 Control register of the ISP1760 is the OTG control register on
* ISP1761. Since there is no OTG or device controller support in this
* driver, we use port 1 as a "normal" USB host port on both chips.
*/
isp1760_write32(isp->regs, HC_PORT1_CTRL, PORT1_POWER | PORT1_INIT2);
usleep_range(10000, 11000);
dev_info(isp->dev, "bus width: %u, oc: %s\n",
isp->devflags & ISP1760_FLAG_BUS_WIDTH_16 ? 16 : 32,
isp->devflags & ISP1760_FLAG_ANALOG_OC ? "analog" : "digital");
}
int isp1760_register(struct resource *mem, int irq, unsigned long irqflags,
struct device *dev, unsigned int devflags)
{
struct isp1760_device *isp;
int ret;
if (usb_disabled())
return -ENODEV;
/* prevent usb-core allocating DMA pages */
dev->dma_mask = NULL;
isp = devm_kzalloc(dev, sizeof(*isp), GFP_KERNEL);
if (!isp)
return -ENOMEM;
isp->dev = dev;
isp->devflags = devflags;
isp->rst_gpio = devm_gpiod_get_optional(dev, NULL, GPIOD_OUT_HIGH);
if (IS_ERR(isp->rst_gpio))
return PTR_ERR(isp->rst_gpio);
isp->regs = devm_ioremap_resource(dev, mem);
if (IS_ERR(isp->regs))
return PTR_ERR(isp->regs);
isp1760_init_core(isp);
ret = isp1760_hcd_register(&isp->hcd, isp->regs, mem, irq,
irqflags | IRQF_SHARED, dev);
if (ret < 0)
return ret;
dev_set_drvdata(dev, isp);
return 0;
}
void isp1760_unregister(struct device *dev)
{
struct isp1760_device *isp = dev_get_drvdata(dev);
isp1760_hcd_unregister(&isp->hcd);
}
MODULE_DESCRIPTION("Driver for the ISP1760 USB-controller from NXP");
MODULE_AUTHOR("Sebastian Siewior <bigeasy@linuxtronix.de>");
MODULE_LICENSE("GPL v2");
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