1/*
  2 * Driver for the NXP ISP1760 chip
  3 *
  4 * Copyright 2014 Laurent Pinchart
  5 * Copyright 2007 Sebastian Siewior
  6 *
  7 * Contacts:
  8 *	Sebastian Siewior <bigeasy@linutronix.de>
  9 *	Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 10 *
 11 * This program is free software; you can redistribute it and/or
 12 * modify it under the terms of the GNU General Public License
 13 * version 2 as published by the Free Software Foundation.
 14 */
 15
 16#include <linux/delay.h>
 17#include <linux/gpio/consumer.h>
 18#include <linux/io.h>
 19#include <linux/kernel.h>
 20#include <linux/module.h>
 21#include <linux/slab.h>
 22#include <linux/usb.h>
 23
 24#include "isp1760-core.h"
 25#include "isp1760-hcd.h"
 26#include "isp1760-regs.h"
 27#include "isp1760-udc.h"
 28
 29static void isp1760_init_core(struct isp1760_device *isp)
 30{
 31	u32 otgctrl;
 32	u32 hwmode;
 33
 34	/* Low-level chip reset */
 35	if (isp->rst_gpio) {
 36		gpiod_set_value_cansleep(isp->rst_gpio, 1);
 37		mdelay(50);
 38		gpiod_set_value_cansleep(isp->rst_gpio, 0);
 39	}
 40
 41	/*
 42	 * Reset the host controller, including the CPU interface
 43	 * configuration.
 44	 */
 45	isp1760_write32(isp->regs, HC_RESET_REG, SW_RESET_RESET_ALL);
 46	msleep(100);
 47
 48	/* Setup HW Mode Control: This assumes a level active-low interrupt */
 49	hwmode = HW_DATA_BUS_32BIT;
 50
 51	if (isp->devflags & ISP1760_FLAG_BUS_WIDTH_16)
 52		hwmode &= ~HW_DATA_BUS_32BIT;
 53	if (isp->devflags & ISP1760_FLAG_ANALOG_OC)
 54		hwmode |= HW_ANA_DIGI_OC;
 55	if (isp->devflags & ISP1760_FLAG_DACK_POL_HIGH)
 56		hwmode |= HW_DACK_POL_HIGH;
 57	if (isp->devflags & ISP1760_FLAG_DREQ_POL_HIGH)
 58		hwmode |= HW_DREQ_POL_HIGH;
 59	if (isp->devflags & ISP1760_FLAG_INTR_POL_HIGH)
 60		hwmode |= HW_INTR_HIGH_ACT;
 61	if (isp->devflags & ISP1760_FLAG_INTR_EDGE_TRIG)
 62		hwmode |= HW_INTR_EDGE_TRIG;
 63
 64	/*
 65	 * The ISP1761 has a dedicated DC IRQ line but supports sharing the HC
 66	 * IRQ line for both the host and device controllers. Hardcode IRQ
 67	 * sharing for now and disable the DC interrupts globally to avoid
 68	 * spurious interrupts during HCD registration.
 69	 */
 70	if (isp->devflags & ISP1760_FLAG_ISP1761) {
 71		isp1760_write32(isp->regs, DC_MODE, 0);
 72		hwmode |= HW_COMN_IRQ;
 73	}
 74
 75	/*
 76	 * We have to set this first in case we're in 16-bit mode.
 77	 * Write it twice to ensure correct upper bits if switching
 78	 * to 16-bit mode.
 79	 */
 80	isp1760_write32(isp->regs, HC_HW_MODE_CTRL, hwmode);
 81	isp1760_write32(isp->regs, HC_HW_MODE_CTRL, hwmode);
 82
 83	/*
 84	 * PORT 1 Control register of the ISP1760 is the OTG control register
 85	 * on ISP1761.
 86	 *
 87	 * TODO: Really support OTG. For now we configure port 1 in device mode
 88	 * when OTG is requested.
 89	 */
 90	if ((isp->devflags & ISP1760_FLAG_ISP1761) &&
 91	    (isp->devflags & ISP1760_FLAG_OTG_EN))
 92		otgctrl = ((HW_DM_PULLDOWN | HW_DP_PULLDOWN) << 16)
 93			| HW_OTG_DISABLE;
 94	else
 95		otgctrl = (HW_SW_SEL_HC_DC << 16)
 96			| (HW_VBUS_DRV | HW_SEL_CP_EXT);
 97
 98	isp1760_write32(isp->regs, HC_PORT1_CTRL, otgctrl);
 99
100	dev_info(isp->dev, "bus width: %u, oc: %s\n",
101		 isp->devflags & ISP1760_FLAG_BUS_WIDTH_16 ? 16 : 32,
102		 isp->devflags & ISP1760_FLAG_ANALOG_OC ? "analog" : "digital");
103}
104
105void isp1760_set_pullup(struct isp1760_device *isp, bool enable)
106{
107	isp1760_write32(isp->regs, HW_OTG_CTRL_SET,
108			enable ? HW_DP_PULLUP : HW_DP_PULLUP << 16);
109}
110
111int isp1760_register(struct resource *mem, int irq, unsigned long irqflags,
112		     struct device *dev, unsigned int devflags)
113{
114	struct isp1760_device *isp;
115	bool udc_disabled = !(devflags & ISP1760_FLAG_ISP1761);
116	int ret;
117
118	/*
119	 * If neither the HCD not the UDC is enabled return an error, as no
120	 * device would be registered.
121	 */
122	if ((!IS_ENABLED(CONFIG_USB_ISP1760_HCD) || usb_disabled()) &&
123	    (!IS_ENABLED(CONFIG_USB_ISP1761_UDC) || udc_disabled))
124		return -ENODEV;
125
126	/* prevent usb-core allocating DMA pages */
127	dev->dma_mask = NULL;
128
129	isp = devm_kzalloc(dev, sizeof(*isp), GFP_KERNEL);
130	if (!isp)
131		return -ENOMEM;
132
133	isp->dev = dev;
134	isp->devflags = devflags;
135
136	isp->rst_gpio = devm_gpiod_get_optional(dev, NULL, GPIOD_OUT_HIGH);
137	if (IS_ERR(isp->rst_gpio))
138		return PTR_ERR(isp->rst_gpio);
139
140	isp->regs = devm_ioremap_resource(dev, mem);
141	if (IS_ERR(isp->regs))
142		return PTR_ERR(isp->regs);
143
144	isp1760_init_core(isp);
145
146	if (IS_ENABLED(CONFIG_USB_ISP1760_HCD) && !usb_disabled()) {
147		ret = isp1760_hcd_register(&isp->hcd, isp->regs, mem, irq,
148					   irqflags | IRQF_SHARED, dev);
149		if (ret < 0)
150			return ret;
151	}
152
153	if (IS_ENABLED(CONFIG_USB_ISP1761_UDC) && !udc_disabled) {
154		ret = isp1760_udc_register(isp, irq, irqflags);
155		if (ret < 0) {
156			isp1760_hcd_unregister(&isp->hcd);
157			return ret;
158		}
159	}
160
161	dev_set_drvdata(dev, isp);
162
163	return 0;
164}
165
166void isp1760_unregister(struct device *dev)
167{
168	struct isp1760_device *isp = dev_get_drvdata(dev);
169
170	isp1760_udc_unregister(isp);
171	isp1760_hcd_unregister(&isp->hcd);
172}
173
174MODULE_DESCRIPTION("Driver for the ISP1760 USB-controller from NXP");
175MODULE_AUTHOR("Sebastian Siewior <bigeasy@linuxtronix.de>");
176MODULE_LICENSE("GPL v2");