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>
10 * Copyright 2021 Linaro, Rui Miguel Silva <rui.silva@linaro.org>
14 #include <linux/usb.h>
16 #include <linux/module.h>
18 #include <linux/platform_device.h>
19 #include <linux/slab.h>
20 #include <linux/usb/hcd.h>
21 #include <linux/usb/otg.h>
23 #include "isp1760-core.h"
24 #include "isp1760-regs.h"
27 #include <linux/pci.h>
31 static int isp1761_pci_init(struct pci_dev *dev)
33 resource_size_t mem_start;
34 resource_size_t mem_length;
40 /* Grab the PLX PCI shared memory of the ISP 1761 we need */
41 mem_start = pci_resource_start(dev, 3);
42 mem_length = pci_resource_len(dev, 3);
43 if (mem_length < 0xffff) {
44 printk(KERN_ERR "memory length for this resource is wrong\n");
48 if (!request_mem_region(mem_start, mem_length, "ISP-PCI")) {
49 printk(KERN_ERR "host controller already in use\n");
53 /* map available memory */
54 iobase = ioremap(mem_start, mem_length);
56 printk(KERN_ERR "Error ioremap failed\n");
57 release_mem_region(mem_start, mem_length);
61 /* bad pci latencies can contribute to overruns */
62 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency);
64 pci_read_config_byte(dev, PCI_MAX_LAT, &limit);
65 if (limit && limit < latency)
66 pci_write_config_byte(dev, PCI_LATENCY_TIMER, limit);
69 /* Try to check whether we can access Scratch Register of
70 * Host Controller or not. The initial PCI access is retried until
71 * local init for the PCI bridge is completed
75 while ((reg_data != 0xFACE) && retry_count) {
76 /*by default host is in 16bit mode, so
77 * io operations at this stage must be 16 bit
79 writel(0xface, iobase + ISP176x_HC_SCRATCH);
81 reg_data = readl(iobase + ISP176x_HC_SCRATCH) & 0x0000ffff;
86 release_mem_region(mem_start, mem_length);
88 /* Host Controller presence is detected by writing to scratch register
89 * and reading back and checking the contents are same or not
91 if (reg_data != 0xFACE) {
92 dev_err(&dev->dev, "scratch register mismatch %x\n", reg_data);
96 /* Grab the PLX PCI mem maped port start address we need */
97 mem_start = pci_resource_start(dev, 0);
98 mem_length = pci_resource_len(dev, 0);
100 if (!request_mem_region(mem_start, mem_length, "ISP1761 IO MEM")) {
101 printk(KERN_ERR "request region #1\n");
105 iobase = ioremap(mem_start, mem_length);
107 printk(KERN_ERR "ioremap #1\n");
108 release_mem_region(mem_start, mem_length);
112 /* configure PLX PCI chip to pass interrupts */
113 #define PLX_INT_CSR_REG 0x68
114 reg_data = readl(iobase + PLX_INT_CSR_REG);
116 writel(reg_data, iobase + PLX_INT_CSR_REG);
118 /* done with PLX IO access */
120 release_mem_region(mem_start, mem_length);
125 static int isp1761_pci_probe(struct pci_dev *dev,
126 const struct pci_device_id *id)
128 unsigned int devflags = 0;
134 if (pci_enable_device(dev) < 0)
137 ret = isp1761_pci_init(dev);
143 ret = isp1760_register(&dev->resource[3], dev->irq, 0, &dev->dev,
151 pci_disable_device(dev);
155 static void isp1761_pci_remove(struct pci_dev *dev)
157 isp1760_unregister(&dev->dev);
159 pci_disable_device(dev);
162 static void isp1761_pci_shutdown(struct pci_dev *dev)
164 printk(KERN_ERR "ips1761_pci_shutdown\n");
167 static const struct pci_device_id isp1760_plx[] = {
169 .class = PCI_CLASS_BRIDGE_OTHER << 8,
171 .vendor = PCI_VENDOR_ID_PLX,
173 .subvendor = PCI_VENDOR_ID_PLX,
178 MODULE_DEVICE_TABLE(pci, isp1760_plx);
180 static struct pci_driver isp1761_pci_driver = {
182 .id_table = isp1760_plx,
183 .probe = isp1761_pci_probe,
184 .remove = isp1761_pci_remove,
185 .shutdown = isp1761_pci_shutdown,
189 static int isp1760_plat_probe(struct platform_device *pdev)
191 unsigned long irqflags;
192 unsigned int devflags = 0;
193 struct resource *mem_res;
194 struct resource *irq_res;
197 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
199 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
201 pr_warn("isp1760: IRQ resource not available\n");
204 irqflags = irq_res->flags & IRQF_TRIGGER_MASK;
206 if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
207 struct device_node *dp = pdev->dev.of_node;
210 if (of_device_is_compatible(dp, "nxp,usb-isp1761"))
211 devflags |= ISP1760_FLAG_ISP1761;
213 if (of_device_is_compatible(dp, "nxp,usb-isp1763"))
214 devflags |= ISP1760_FLAG_ISP1763;
217 * Some systems wire up only 8 of 16 data lines or
218 * 16 of the 32 data lines
220 of_property_read_u32(dp, "bus-width", &bus_width);
222 devflags |= ISP1760_FLAG_BUS_WIDTH_16;
223 else if (bus_width == 8)
224 devflags |= ISP1760_FLAG_BUS_WIDTH_8;
226 if (usb_get_dr_mode(&pdev->dev) == USB_DR_MODE_PERIPHERAL)
227 devflags |= ISP1760_FLAG_PERIPHERAL_EN;
229 if (of_property_read_bool(dp, "analog-oc"))
230 devflags |= ISP1760_FLAG_ANALOG_OC;
232 if (of_property_read_bool(dp, "dack-polarity"))
233 devflags |= ISP1760_FLAG_DACK_POL_HIGH;
235 if (of_property_read_bool(dp, "dreq-polarity"))
236 devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
238 pr_err("isp1760: no platform data\n");
242 ret = isp1760_register(mem_res, irq_res->start, irqflags, &pdev->dev,
247 pr_info("ISP1760 USB device initialised\n");
251 static int isp1760_plat_remove(struct platform_device *pdev)
253 isp1760_unregister(&pdev->dev);
259 static const struct of_device_id isp1760_of_match[] = {
260 { .compatible = "nxp,usb-isp1760", },
261 { .compatible = "nxp,usb-isp1761", },
262 { .compatible = "nxp,usb-isp1763", },
265 MODULE_DEVICE_TABLE(of, isp1760_of_match);
268 static struct platform_driver isp1760_plat_driver = {
269 .probe = isp1760_plat_probe,
270 .remove = isp1760_plat_remove,
273 .of_match_table = of_match_ptr(isp1760_of_match),
277 static int __init isp1760_init(void)
279 int ret, any_ret = -ENODEV;
281 isp1760_init_kmem_once();
283 ret = platform_driver_register(&isp1760_plat_driver);
286 #ifdef CONFIG_USB_PCI
287 ret = pci_register_driver(&isp1761_pci_driver);
293 isp1760_deinit_kmem_cache();
296 module_init(isp1760_init);
298 static void __exit isp1760_exit(void)
300 platform_driver_unregister(&isp1760_plat_driver);
301 #ifdef CONFIG_USB_PCI
302 pci_unregister_driver(&isp1761_pci_driver);
304 isp1760_deinit_kmem_cache();
306 module_exit(isp1760_exit);