1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Driver for the NXP ISP1760 chip
4 *
5 * Copyright 2014 Laurent Pinchart
6 * Copyright 2007 Sebastian Siewior
7 *
8 * Contacts:
9 * Sebastian Siewior <bigeasy@linutronix.de>
10 * Laurent Pinchart <laurent.pinchart@ideasonboard.com>
11 */
12
13 #include <linux/delay.h>
14 #include <linux/gpio/consumer.h>
15 #include <linux/io.h>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/slab.h>
19 #include <linux/usb.h>
20
21 #include "isp1760-core.h"
22 #include "isp1760-hcd.h"
23 #include "isp1760-regs.h"
24 #include "isp1760-udc.h"
25
isp1760_init_core(struct isp1760_device * isp)26 static void isp1760_init_core(struct isp1760_device *isp)
27 {
28 u32 otgctrl;
29 u32 hwmode;
30
31 /* Low-level chip reset */
32 if (isp->rst_gpio) {
33 gpiod_set_value_cansleep(isp->rst_gpio, 1);
34 msleep(50);
35 gpiod_set_value_cansleep(isp->rst_gpio, 0);
36 }
37
38 /*
39 * Reset the host controller, including the CPU interface
40 * configuration.
41 */
42 isp1760_write32(isp->regs, HC_RESET_REG, SW_RESET_RESET_ALL);
43 msleep(100);
44
45 /* Setup HW Mode Control: This assumes a level active-low interrupt */
46 hwmode = HW_DATA_BUS_32BIT;
47
48 if (isp->devflags & ISP1760_FLAG_BUS_WIDTH_16)
49 hwmode &= ~HW_DATA_BUS_32BIT;
50 if (isp->devflags & ISP1760_FLAG_ANALOG_OC)
51 hwmode |= HW_ANA_DIGI_OC;
52 if (isp->devflags & ISP1760_FLAG_DACK_POL_HIGH)
53 hwmode |= HW_DACK_POL_HIGH;
54 if (isp->devflags & ISP1760_FLAG_DREQ_POL_HIGH)
55 hwmode |= HW_DREQ_POL_HIGH;
56 if (isp->devflags & ISP1760_FLAG_INTR_POL_HIGH)
57 hwmode |= HW_INTR_HIGH_ACT;
58 if (isp->devflags & ISP1760_FLAG_INTR_EDGE_TRIG)
59 hwmode |= HW_INTR_EDGE_TRIG;
60
61 /*
62 * The ISP1761 has a dedicated DC IRQ line but supports sharing the HC
63 * IRQ line for both the host and device controllers. Hardcode IRQ
64 * sharing for now and disable the DC interrupts globally to avoid
65 * spurious interrupts during HCD registration.
66 */
67 if (isp->devflags & ISP1760_FLAG_ISP1761) {
68 isp1760_write32(isp->regs, DC_MODE, 0);
69 hwmode |= HW_COMN_IRQ;
70 }
71
72 /*
73 * We have to set this first in case we're in 16-bit mode.
74 * Write it twice to ensure correct upper bits if switching
75 * to 16-bit mode.
76 */
77 isp1760_write32(isp->regs, HC_HW_MODE_CTRL, hwmode);
78 isp1760_write32(isp->regs, HC_HW_MODE_CTRL, hwmode);
79
80 /*
81 * PORT 1 Control register of the ISP1760 is the OTG control register
82 * on ISP1761.
83 *
84 * TODO: Really support OTG. For now we configure port 1 in device mode
85 * when OTG is requested.
86 */
87 if ((isp->devflags & ISP1760_FLAG_ISP1761) &&
88 (isp->devflags & ISP1760_FLAG_OTG_EN))
89 otgctrl = ((HW_DM_PULLDOWN | HW_DP_PULLDOWN) << 16)
90 | HW_OTG_DISABLE;
91 else
92 otgctrl = (HW_SW_SEL_HC_DC << 16)
93 | (HW_VBUS_DRV | HW_SEL_CP_EXT);
94
95 isp1760_write32(isp->regs, HC_PORT1_CTRL, otgctrl);
96
97 dev_info(isp->dev, "bus width: %u, oc: %s\n",
98 isp->devflags & ISP1760_FLAG_BUS_WIDTH_16 ? 16 : 32,
99 isp->devflags & ISP1760_FLAG_ANALOG_OC ? "analog" : "digital");
100 }
101
isp1760_set_pullup(struct isp1760_device * isp,bool enable)102 void isp1760_set_pullup(struct isp1760_device *isp, bool enable)
103 {
104 isp1760_write32(isp->regs, HW_OTG_CTRL_SET,
105 enable ? HW_DP_PULLUP : HW_DP_PULLUP << 16);
106 }
107
isp1760_register(struct resource * mem,int irq,unsigned long irqflags,struct device * dev,unsigned int devflags)108 int isp1760_register(struct resource *mem, int irq, unsigned long irqflags,
109 struct device *dev, unsigned int devflags)
110 {
111 struct isp1760_device *isp;
112 bool udc_disabled = !(devflags & ISP1760_FLAG_ISP1761);
113 int ret;
114
115 /*
116 * If neither the HCD not the UDC is enabled return an error, as no
117 * device would be registered.
118 */
119 if ((!IS_ENABLED(CONFIG_USB_ISP1760_HCD) || usb_disabled()) &&
120 (!IS_ENABLED(CONFIG_USB_ISP1761_UDC) || udc_disabled))
121 return -ENODEV;
122
123 isp = devm_kzalloc(dev, sizeof(*isp), GFP_KERNEL);
124 if (!isp)
125 return -ENOMEM;
126
127 isp->dev = dev;
128 isp->devflags = devflags;
129
130 isp->rst_gpio = devm_gpiod_get_optional(dev, NULL, GPIOD_OUT_HIGH);
131 if (IS_ERR(isp->rst_gpio))
132 return PTR_ERR(isp->rst_gpio);
133
134 isp->regs = devm_ioremap_resource(dev, mem);
135 if (IS_ERR(isp->regs))
136 return PTR_ERR(isp->regs);
137
138 isp1760_init_core(isp);
139
140 if (IS_ENABLED(CONFIG_USB_ISP1760_HCD) && !usb_disabled()) {
141 ret = isp1760_hcd_register(&isp->hcd, isp->regs, mem, irq,
142 irqflags | IRQF_SHARED, dev);
143 if (ret < 0)
144 return ret;
145 }
146
147 if (IS_ENABLED(CONFIG_USB_ISP1761_UDC) && !udc_disabled) {
148 ret = isp1760_udc_register(isp, irq, irqflags);
149 if (ret < 0) {
150 isp1760_hcd_unregister(&isp->hcd);
151 return ret;
152 }
153 }
154
155 dev_set_drvdata(dev, isp);
156
157 return 0;
158 }
159
isp1760_unregister(struct device * dev)160 void isp1760_unregister(struct device *dev)
161 {
162 struct isp1760_device *isp = dev_get_drvdata(dev);
163
164 isp1760_udc_unregister(isp);
165 isp1760_hcd_unregister(&isp->hcd);
166 }
167
168 MODULE_DESCRIPTION("Driver for the ISP1760 USB-controller from NXP");
169 MODULE_AUTHOR("Sebastian Siewior <bigeasy@linuxtronix.de>");
170 MODULE_LICENSE("GPL v2");
171
