xref: /openbmc/linux/drivers/usb/isp1760/isp1760-if.c (revision e0d53e4f)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Glue code for the ISP1760 driver and bus
4  * Currently there is support for
5  * - OpenFirmware
6  * - PCI
7  * - PDEV (generic platform device centralized driver model)
8  *
9  * (c) 2007 Sebastian Siewior <bigeasy@linutronix.de>
10  * Copyright 2021 Linaro, Rui Miguel Silva <rui.silva@linaro.org>
11  *
12  */
13 
14 #include <linux/usb.h>
15 #include <linux/io.h>
16 #include <linux/irq.h>
17 #include <linux/module.h>
18 #include <linux/of.h>
19 #include <linux/platform_device.h>
20 #include <linux/slab.h>
21 #include <linux/usb/hcd.h>
22 #include <linux/usb/otg.h>
23 
24 #include "isp1760-core.h"
25 #include "isp1760-regs.h"
26 
27 #ifdef CONFIG_USB_PCI
28 #include <linux/pci.h>
29 #endif
30 
31 #ifdef CONFIG_USB_PCI
isp1761_pci_init(struct pci_dev * dev)32 static int isp1761_pci_init(struct pci_dev *dev)
33 {
34 	resource_size_t mem_start;
35 	resource_size_t mem_length;
36 	u8 __iomem *iobase;
37 	u8 latency, limit;
38 	int retry_count;
39 	u32 reg_data;
40 
41 	/* Grab the PLX PCI shared memory of the ISP 1761 we need  */
42 	mem_start = pci_resource_start(dev, 3);
43 	mem_length = pci_resource_len(dev, 3);
44 	if (mem_length < 0xffff) {
45 		printk(KERN_ERR "memory length for this resource is wrong\n");
46 		return -ENOMEM;
47 	}
48 
49 	if (!request_mem_region(mem_start, mem_length, "ISP-PCI")) {
50 		printk(KERN_ERR "host controller already in use\n");
51 		return -EBUSY;
52 	}
53 
54 	/* map available memory */
55 	iobase = ioremap(mem_start, mem_length);
56 	if (!iobase) {
57 		printk(KERN_ERR "Error ioremap failed\n");
58 		release_mem_region(mem_start, mem_length);
59 		return -ENOMEM;
60 	}
61 
62 	/* bad pci latencies can contribute to overruns */
63 	pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency);
64 	if (latency) {
65 		pci_read_config_byte(dev, PCI_MAX_LAT, &limit);
66 		if (limit && limit < latency)
67 			pci_write_config_byte(dev, PCI_LATENCY_TIMER, limit);
68 	}
69 
70 	/* Try to check whether we can access Scratch Register of
71 	 * Host Controller or not. The initial PCI access is retried until
72 	 * local init for the PCI bridge is completed
73 	 */
74 	retry_count = 20;
75 	reg_data = 0;
76 	while ((reg_data != 0xFACE) && retry_count) {
77 		/*by default host is in 16bit mode, so
78 		 * io operations at this stage must be 16 bit
79 		 * */
80 		writel(0xface, iobase + ISP176x_HC_SCRATCH);
81 		udelay(100);
82 		reg_data = readl(iobase + ISP176x_HC_SCRATCH) & 0x0000ffff;
83 		retry_count--;
84 	}
85 
86 	iounmap(iobase);
87 	release_mem_region(mem_start, mem_length);
88 
89 	/* Host Controller presence is detected by writing to scratch register
90 	 * and reading back and checking the contents are same or not
91 	 */
92 	if (reg_data != 0xFACE) {
93 		dev_err(&dev->dev, "scratch register mismatch %x\n", reg_data);
94 		return -ENOMEM;
95 	}
96 
97 	/* Grab the PLX PCI mem maped port start address we need  */
98 	mem_start = pci_resource_start(dev, 0);
99 	mem_length = pci_resource_len(dev, 0);
100 
101 	if (!request_mem_region(mem_start, mem_length, "ISP1761 IO MEM")) {
102 		printk(KERN_ERR "request region #1\n");
103 		return -EBUSY;
104 	}
105 
106 	iobase = ioremap(mem_start, mem_length);
107 	if (!iobase) {
108 		printk(KERN_ERR "ioremap #1\n");
109 		release_mem_region(mem_start, mem_length);
110 		return -ENOMEM;
111 	}
112 
113 	/* configure PLX PCI chip to pass interrupts */
114 #define PLX_INT_CSR_REG 0x68
115 	reg_data = readl(iobase + PLX_INT_CSR_REG);
116 	reg_data |= 0x900;
117 	writel(reg_data, iobase + PLX_INT_CSR_REG);
118 
119 	/* done with PLX IO access */
120 	iounmap(iobase);
121 	release_mem_region(mem_start, mem_length);
122 
123 	return 0;
124 }
125 
isp1761_pci_probe(struct pci_dev * dev,const struct pci_device_id * id)126 static int isp1761_pci_probe(struct pci_dev *dev,
127 		const struct pci_device_id *id)
128 {
129 	unsigned int devflags = 0;
130 	int ret;
131 
132 	if (!dev->irq)
133 		return -ENODEV;
134 
135 	if (pci_enable_device(dev) < 0)
136 		return -ENODEV;
137 
138 	ret = isp1761_pci_init(dev);
139 	if (ret < 0)
140 		goto error;
141 
142 	pci_set_master(dev);
143 
144 	ret = isp1760_register(&dev->resource[3], dev->irq, 0, &dev->dev,
145 			       devflags);
146 	if (ret < 0)
147 		goto error;
148 
149 	return 0;
150 
151 error:
152 	pci_disable_device(dev);
153 	return ret;
154 }
155 
isp1761_pci_remove(struct pci_dev * dev)156 static void isp1761_pci_remove(struct pci_dev *dev)
157 {
158 	isp1760_unregister(&dev->dev);
159 
160 	pci_disable_device(dev);
161 }
162 
isp1761_pci_shutdown(struct pci_dev * dev)163 static void isp1761_pci_shutdown(struct pci_dev *dev)
164 {
165 	printk(KERN_ERR "ips1761_pci_shutdown\n");
166 }
167 
168 static const struct pci_device_id isp1760_plx[] = {
169 	{
170 		.class          = PCI_CLASS_BRIDGE_OTHER << 8,
171 		.class_mask     = ~0,
172 		.vendor		= PCI_VENDOR_ID_PLX,
173 		.device		= 0x5406,
174 		.subvendor	= PCI_VENDOR_ID_PLX,
175 		.subdevice	= 0x9054,
176 	},
177 	{ }
178 };
179 MODULE_DEVICE_TABLE(pci, isp1760_plx);
180 
181 static struct pci_driver isp1761_pci_driver = {
182 	.name =         "isp1760",
183 	.id_table =     isp1760_plx,
184 	.probe =        isp1761_pci_probe,
185 	.remove =       isp1761_pci_remove,
186 	.shutdown =     isp1761_pci_shutdown,
187 };
188 #endif
189 
isp1760_plat_probe(struct platform_device * pdev)190 static int isp1760_plat_probe(struct platform_device *pdev)
191 {
192 	unsigned long irqflags;
193 	unsigned int devflags = 0;
194 	struct resource *mem_res;
195 	int irq;
196 	int ret;
197 
198 	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
199 
200 	irq = platform_get_irq(pdev, 0);
201 	if (irq < 0)
202 		return irq;
203 	irqflags = irq_get_trigger_type(irq);
204 
205 	if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
206 		struct device_node *dp = pdev->dev.of_node;
207 		u32 bus_width = 0;
208 
209 		if (of_device_is_compatible(dp, "nxp,usb-isp1761"))
210 			devflags |= ISP1760_FLAG_ISP1761;
211 
212 		if (of_device_is_compatible(dp, "nxp,usb-isp1763"))
213 			devflags |= ISP1760_FLAG_ISP1763;
214 
215 		/*
216 		 * Some systems wire up only 8 of 16 data lines or
217 		 * 16 of the 32 data lines
218 		 */
219 		of_property_read_u32(dp, "bus-width", &bus_width);
220 		if (bus_width == 16)
221 			devflags |= ISP1760_FLAG_BUS_WIDTH_16;
222 		else if (bus_width == 8)
223 			devflags |= ISP1760_FLAG_BUS_WIDTH_8;
224 
225 		if (usb_get_dr_mode(&pdev->dev) == USB_DR_MODE_PERIPHERAL)
226 			devflags |= ISP1760_FLAG_PERIPHERAL_EN;
227 
228 		if (of_property_read_bool(dp, "analog-oc"))
229 			devflags |= ISP1760_FLAG_ANALOG_OC;
230 
231 		if (of_property_read_bool(dp, "dack-polarity"))
232 			devflags |= ISP1760_FLAG_DACK_POL_HIGH;
233 
234 		if (of_property_read_bool(dp, "dreq-polarity"))
235 			devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
236 	} else {
237 		pr_err("isp1760: no platform data\n");
238 		return -ENXIO;
239 	}
240 
241 	ret = isp1760_register(mem_res, irq, irqflags, &pdev->dev, devflags);
242 	if (ret < 0)
243 		return ret;
244 
245 	pr_info("ISP1760 USB device initialised\n");
246 	return 0;
247 }
248 
isp1760_plat_remove(struct platform_device * pdev)249 static void isp1760_plat_remove(struct platform_device *pdev)
250 {
251 	isp1760_unregister(&pdev->dev);
252 }
253 
254 #ifdef CONFIG_OF
255 static const struct of_device_id isp1760_of_match[] = {
256 	{ .compatible = "nxp,usb-isp1760", },
257 	{ .compatible = "nxp,usb-isp1761", },
258 	{ .compatible = "nxp,usb-isp1763", },
259 	{ },
260 };
261 MODULE_DEVICE_TABLE(of, isp1760_of_match);
262 #endif
263 
264 static struct platform_driver isp1760_plat_driver = {
265 	.probe	= isp1760_plat_probe,
266 	.remove_new = isp1760_plat_remove,
267 	.driver	= {
268 		.name	= "isp1760",
269 		.of_match_table = of_match_ptr(isp1760_of_match),
270 	},
271 };
272 
isp1760_init(void)273 static int __init isp1760_init(void)
274 {
275 	int ret, any_ret = -ENODEV;
276 
277 	isp1760_init_kmem_once();
278 
279 	ret = platform_driver_register(&isp1760_plat_driver);
280 	if (!ret)
281 		any_ret = 0;
282 #ifdef CONFIG_USB_PCI
283 	ret = pci_register_driver(&isp1761_pci_driver);
284 	if (!ret)
285 		any_ret = 0;
286 #endif
287 
288 	if (any_ret)
289 		isp1760_deinit_kmem_cache();
290 	return any_ret;
291 }
292 module_init(isp1760_init);
293 
isp1760_exit(void)294 static void __exit isp1760_exit(void)
295 {
296 	platform_driver_unregister(&isp1760_plat_driver);
297 #ifdef CONFIG_USB_PCI
298 	pci_unregister_driver(&isp1761_pci_driver);
299 #endif
300 	isp1760_deinit_kmem_cache();
301 }
302 module_exit(isp1760_exit);
303