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 |
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(offset: mem_start, size: 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, val: &latency); |
64 | if (latency) { |
65 | pci_read_config_byte(dev, PCI_MAX_LAT, val: &limit); |
66 | if (limit && limit < latency) |
67 | pci_write_config_byte(dev, PCI_LATENCY_TIMER, val: 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(val: 0xface, addr: iobase + ISP176x_HC_SCRATCH); |
81 | udelay(100); |
82 | reg_data = readl(addr: iobase + ISP176x_HC_SCRATCH) & 0x0000ffff; |
83 | retry_count--; |
84 | } |
85 | |
86 | iounmap(addr: 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(offset: mem_start, size: 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(addr: iobase + PLX_INT_CSR_REG); |
116 | reg_data |= 0x900; |
117 | writel(val: reg_data, addr: iobase + PLX_INT_CSR_REG); |
118 | |
119 | /* done with PLX IO access */ |
120 | iounmap(addr: iobase); |
121 | release_mem_region(mem_start, mem_length); |
122 | |
123 | return 0; |
124 | } |
125 | |
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(mem: &dev->resource[3], irq: dev->irq, irqflags: 0, dev: &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 | |
156 | static void isp1761_pci_remove(struct pci_dev *dev) |
157 | { |
158 | isp1760_unregister(dev: &dev->dev); |
159 | |
160 | pci_disable_device(dev); |
161 | } |
162 | |
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 | |
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(device: dp, "nxp,usb-isp1761" )) |
210 | devflags |= ISP1760_FLAG_ISP1761; |
211 | |
212 | if (of_device_is_compatible(device: 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(np: dp, propname: "bus-width" , out_value: &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(dev: &pdev->dev) == USB_DR_MODE_PERIPHERAL) |
226 | devflags |= ISP1760_FLAG_PERIPHERAL_EN; |
227 | |
228 | if (of_property_read_bool(np: dp, propname: "analog-oc" )) |
229 | devflags |= ISP1760_FLAG_ANALOG_OC; |
230 | |
231 | if (of_property_read_bool(np: dp, propname: "dack-polarity" )) |
232 | devflags |= ISP1760_FLAG_DACK_POL_HIGH; |
233 | |
234 | if (of_property_read_bool(np: dp, propname: "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: mem_res, irq, irqflags, dev: &pdev->dev, devflags); |
242 | if (ret < 0) |
243 | return ret; |
244 | |
245 | pr_info("ISP1760 USB device initialised\n" ); |
246 | return 0; |
247 | } |
248 | |
249 | static void isp1760_plat_remove(struct platform_device *pdev) |
250 | { |
251 | isp1760_unregister(dev: &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 | |
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 | |
294 | static void __exit isp1760_exit(void) |
295 | { |
296 | platform_driver_unregister(&isp1760_plat_driver); |
297 | #ifdef CONFIG_USB_PCI |
298 | pci_unregister_driver(dev: &isp1761_pci_driver); |
299 | #endif |
300 | isp1760_deinit_kmem_cache(); |
301 | } |
302 | module_exit(isp1760_exit); |
303 | |