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