2 * Driver for the NXP ISP1760 chip
4 * Copyright 2014 Laurent Pinchart
5 * Copyright 2007 Sebastian Siewior
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.
16 #include <linux/delay.h>
17 #include <linux/gpio/consumer.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/slab.h>
22 #include <linux/usb.h>
24 #include "isp1760-core.h"
25 #include "isp1760-hcd.h"
26 #include "isp1760-regs.h"
27 #include "isp1760-udc.h"
29 static void isp1760_init_core(struct isp1760_device *isp)
34 /* Low-level chip reset */
36 gpiod_set_value_cansleep(isp->rst_gpio, 1);
38 gpiod_set_value_cansleep(isp->rst_gpio, 0);
42 * Reset the host controller, including the CPU interface
45 isp1760_write32(isp->regs, HC_RESET_REG, SW_RESET_RESET_ALL);
48 /* Setup HW Mode Control: This assumes a level active-low interrupt */
49 hwmode = HW_DATA_BUS_32BIT;
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;
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.
70 if (isp->devflags & ISP1760_FLAG_ISP1761) {
71 isp1760_write32(isp->regs, DC_MODE, 0);
72 hwmode |= HW_COMN_IRQ;
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
80 isp1760_write32(isp->regs, HC_HW_MODE_CTRL, hwmode);
81 isp1760_write32(isp->regs, HC_HW_MODE_CTRL, hwmode);
84 * PORT 1 Control register of the ISP1760 is the OTG control register
87 * TODO: Really support OTG. For now we configure port 1 in device mode
88 * when OTG is requested.
90 if ((isp->devflags & ISP1760_FLAG_ISP1761) &&
91 (isp->devflags & ISP1760_FLAG_OTG_EN))
92 otgctrl = ((HW_DM_PULLDOWN | HW_DP_PULLDOWN) << 16)
95 otgctrl = (HW_SW_SEL_HC_DC << 16)
96 | (HW_VBUS_DRV | HW_SEL_CP_EXT);
98 isp1760_write32(isp->regs, HC_PORT1_CTRL, otgctrl);
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");
105 void isp1760_set_pullup(struct isp1760_device *isp, bool enable)
107 isp1760_write32(isp->regs, HW_OTG_CTRL_SET,
108 enable ? HW_DP_PULLUP : HW_DP_PULLUP << 16);
111 int isp1760_register(struct resource *mem, int irq, unsigned long irqflags,
112 struct device *dev, unsigned int devflags)
114 struct isp1760_device *isp;
115 bool udc_disabled = !(devflags & ISP1760_FLAG_ISP1761);
119 * If neither the HCD not the UDC is enabled return an error, as no
120 * device would be registered.
122 if ((!IS_ENABLED(CONFIG_USB_ISP1760_HCD) || usb_disabled()) &&
123 (!IS_ENABLED(CONFIG_USB_ISP1761_UDC) || udc_disabled))
126 /* prevent usb-core allocating DMA pages */
127 dev->dma_mask = NULL;
129 isp = devm_kzalloc(dev, sizeof(*isp), GFP_KERNEL);
134 isp->devflags = devflags;
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);
140 isp->regs = devm_ioremap_resource(dev, mem);
141 if (IS_ERR(isp->regs))
142 return PTR_ERR(isp->regs);
144 isp1760_init_core(isp);
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);
153 if (IS_ENABLED(CONFIG_USB_ISP1761_UDC) && !udc_disabled) {
154 ret = isp1760_udc_register(isp, irq, irqflags);
156 isp1760_hcd_unregister(&isp->hcd);
161 dev_set_drvdata(dev, isp);
166 void isp1760_unregister(struct device *dev)
168 struct isp1760_device *isp = dev_get_drvdata(dev);
170 isp1760_udc_unregister(isp);
171 isp1760_hcd_unregister(&isp->hcd);
174 MODULE_DESCRIPTION("Driver for the ISP1760 USB-controller from NXP");
176 MODULE_LICENSE("GPL v2");