1 // SPDX-License-Identifier: GPL-2.0
3 * Glue code for the ISP1760 driver and bus
4 * Currently there is support for
7 * - PDEV (generic platform device centralized driver model)
9 * (c) 2007 Sebastian Siewior <bigeasy@linutronix.de>
13 #include <linux/usb.h>
15 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/slab.h>
19 #include <linux/usb/hcd.h>
21 #include "isp1760-core.h"
22 #include "isp1760-regs.h"
25 #include <linux/pci.h>
29 static int isp1761_pci_init(struct pci_dev *dev)
31 resource_size_t mem_start;
32 resource_size_t mem_length;
38 /* Grab the PLX PCI shared memory of the ISP 1761 we need */
39 mem_start = pci_resource_start(dev, 3);
40 mem_length = pci_resource_len(dev, 3);
41 if (mem_length < 0xffff) {
42 printk(KERN_ERR "memory length for this resource is wrong\n");
46 if (!request_mem_region(mem_start, mem_length, "ISP-PCI")) {
47 printk(KERN_ERR "host controller already in use\n");
51 /* map available memory */
52 iobase = ioremap(mem_start, mem_length);
54 printk(KERN_ERR "Error ioremap failed\n");
55 release_mem_region(mem_start, mem_length);
59 /* bad pci latencies can contribute to overruns */
60 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency);
62 pci_read_config_byte(dev, PCI_MAX_LAT, &limit);
63 if (limit && limit < latency)
64 pci_write_config_byte(dev, PCI_LATENCY_TIMER, limit);
67 /* Try to check whether we can access Scratch Register of
68 * Host Controller or not. The initial PCI access is retried until
69 * local init for the PCI bridge is completed
73 while ((reg_data != 0xFACE) && retry_count) {
74 /*by default host is in 16bit mode, so
75 * io operations at this stage must be 16 bit
77 writel(0xface, iobase + ISP176x_HC_SCRATCH);
79 reg_data = readl(iobase + ISP176x_HC_SCRATCH) & 0x0000ffff;
84 release_mem_region(mem_start, mem_length);
86 /* Host Controller presence is detected by writing to scratch register
87 * and reading back and checking the contents are same or not
89 if (reg_data != 0xFACE) {
90 dev_err(&dev->dev, "scratch register mismatch %x\n", reg_data);
94 /* Grab the PLX PCI mem maped port start address we need */
95 mem_start = pci_resource_start(dev, 0);
96 mem_length = pci_resource_len(dev, 0);
98 if (!request_mem_region(mem_start, mem_length, "ISP1761 IO MEM")) {
99 printk(KERN_ERR "request region #1\n");
103 iobase = ioremap(mem_start, mem_length);
105 printk(KERN_ERR "ioremap #1\n");
106 release_mem_region(mem_start, mem_length);
110 /* configure PLX PCI chip to pass interrupts */
111 #define PLX_INT_CSR_REG 0x68
112 reg_data = readl(iobase + PLX_INT_CSR_REG);
114 writel(reg_data, iobase + PLX_INT_CSR_REG);
116 /* done with PLX IO access */
118 release_mem_region(mem_start, mem_length);
123 static int isp1761_pci_probe(struct pci_dev *dev,
124 const struct pci_device_id *id)
126 unsigned int devflags = 0;
132 if (pci_enable_device(dev) < 0)
135 ret = isp1761_pci_init(dev);
141 ret = isp1760_register(&dev->resource[3], dev->irq, 0, &dev->dev,
149 pci_disable_device(dev);
153 static void isp1761_pci_remove(struct pci_dev *dev)
155 isp1760_unregister(&dev->dev);
157 pci_disable_device(dev);
160 static void isp1761_pci_shutdown(struct pci_dev *dev)
162 printk(KERN_ERR "ips1761_pci_shutdown\n");
165 static const struct pci_device_id isp1760_plx[] = {
167 .class = PCI_CLASS_BRIDGE_OTHER << 8,
169 .vendor = PCI_VENDOR_ID_PLX,
171 .subvendor = PCI_VENDOR_ID_PLX,
176 MODULE_DEVICE_TABLE(pci, isp1760_plx);
178 static struct pci_driver isp1761_pci_driver = {
180 .id_table = isp1760_plx,
181 .probe = isp1761_pci_probe,
182 .remove = isp1761_pci_remove,
183 .shutdown = isp1761_pci_shutdown,
187 static int isp1760_plat_probe(struct platform_device *pdev)
189 unsigned long irqflags;
190 unsigned int devflags = 0;
191 struct resource *mem_res;
192 struct resource *irq_res;
195 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
197 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
199 pr_warn("isp1760: IRQ resource not available\n");
202 irqflags = irq_res->flags & IRQF_TRIGGER_MASK;
204 if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
205 struct device_node *dp = pdev->dev.of_node;
208 if (of_device_is_compatible(dp, "nxp,usb-isp1761"))
209 devflags |= ISP1760_FLAG_ISP1761;
211 /* Some systems wire up only 16 of the 32 data lines */
212 of_property_read_u32(dp, "bus-width", &bus_width);
214 devflags |= ISP1760_FLAG_BUS_WIDTH_16;
216 if (of_property_read_bool(dp, "port1-otg"))
217 devflags |= ISP1760_FLAG_OTG_EN;
219 if (of_property_read_bool(dp, "analog-oc"))
220 devflags |= ISP1760_FLAG_ANALOG_OC;
222 if (of_property_read_bool(dp, "dack-polarity"))
223 devflags |= ISP1760_FLAG_DACK_POL_HIGH;
225 if (of_property_read_bool(dp, "dreq-polarity"))
226 devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
228 pr_err("isp1760: no platform data\n");
232 ret = isp1760_register(mem_res, irq_res->start, irqflags, &pdev->dev,
237 pr_info("ISP1760 USB device initialised\n");
241 static int isp1760_plat_remove(struct platform_device *pdev)
243 isp1760_unregister(&pdev->dev);
249 static const struct of_device_id isp1760_of_match[] = {
250 { .compatible = "nxp,usb-isp1760", },
251 { .compatible = "nxp,usb-isp1761", },
254 MODULE_DEVICE_TABLE(of, isp1760_of_match);
257 static struct platform_driver isp1760_plat_driver = {
258 .probe = isp1760_plat_probe,
259 .remove = isp1760_plat_remove,
262 .of_match_table = of_match_ptr(isp1760_of_match),
266 static int __init isp1760_init(void)
268 int ret, any_ret = -ENODEV;
270 isp1760_init_kmem_once();
272 ret = platform_driver_register(&isp1760_plat_driver);
275 #ifdef CONFIG_USB_PCI
276 ret = pci_register_driver(&isp1761_pci_driver);
282 isp1760_deinit_kmem_cache();
285 module_init(isp1760_init);
287 static void __exit isp1760_exit(void)
289 platform_driver_unregister(&isp1760_plat_driver);
290 #ifdef CONFIG_USB_PCI
291 pci_unregister_driver(&isp1761_pci_driver);
293 isp1760_deinit_kmem_cache();
295 module_exit(isp1760_exit);