1/*
  2 * Glue code for the ISP1760 driver and bus
  3 * Currently there is support for
  4 * - OpenFirmware
  5 * - PCI
  6 * - PDEV (generic platform device centralized driver model)
  7 *
  8 * (c) 2007 Sebastian Siewior <bigeasy@linutronix.de>
  9 *
 10 */
 11
 12#include <linux/usb.h>
 13#include <linux/io.h>
 14#include <linux/module.h>
 15#include <linux/of.h>
 16#include <linux/platform_device.h>
 17#include <linux/slab.h>
 18#include <linux/usb/isp1760.h>
 19#include <linux/usb/hcd.h>
 20
 21#include "isp1760-core.h"
 22#include "isp1760-regs.h"
 23
 24#ifdef CONFIG_PCI
 25#include <linux/pci.h>
 26#endif
 27
 28#ifdef CONFIG_PCI
 29static int isp1761_pci_init(struct pci_dev *dev)
 30{
 31	resource_size_t mem_start;
 32	resource_size_t mem_length;
 33	u8 __iomem *iobase;
 34	u8 latency, limit;
 35	int retry_count;
 36	u32 reg_data;
 37
 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");
 43		return -ENOMEM;
 44	}
 45
 46	if (!request_mem_region(mem_start, mem_length, "ISP-PCI")) {
 47		printk(KERN_ERR "host controller already in use\n");
 48		return -EBUSY;
 49	}
 50
 51	/* map available memory */
 52	iobase = ioremap_nocache(mem_start, mem_length);
 53	if (!iobase) {
 54		printk(KERN_ERR "Error ioremap failed\n");
 55		release_mem_region(mem_start, mem_length);
 56		return -ENOMEM;
 57	}
 58
 59	/* bad pci latencies can contribute to overruns */
 60	pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency);
 61	if (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);
 65	}
 66
 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
 70	 */
 71	retry_count = 20;
 72	reg_data = 0;
 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
 76		 * */
 77		writel(0xface, iobase + HC_SCRATCH_REG);
 78		udelay(100);
 79		reg_data = readl(iobase + HC_SCRATCH_REG) & 0x0000ffff;
 80		retry_count--;
 81	}
 82
 83	iounmap(iobase);
 84	release_mem_region(mem_start, mem_length);
 85
 86	/* Host Controller presence is detected by writing to scratch register
 87	 * and reading back and checking the contents are same or not
 88	 */
 89	if (reg_data != 0xFACE) {
 90		dev_err(&dev->dev, "scratch register mismatch %x\n", reg_data);
 91		return -ENOMEM;
 92	}
 93
 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);
 97
 98	if (!request_mem_region(mem_start, mem_length, "ISP1761 IO MEM")) {
 99		printk(KERN_ERR "request region #1\n");
100		return -EBUSY;
101	}
102
103	iobase = ioremap_nocache(mem_start, mem_length);
104	if (!iobase) {
105		printk(KERN_ERR "ioremap #1\n");
106		release_mem_region(mem_start, mem_length);
107		return -ENOMEM;
108	}
109
110	/* configure PLX PCI chip to pass interrupts */
111#define PLX_INT_CSR_REG 0x68
112	reg_data = readl(iobase + PLX_INT_CSR_REG);
113	reg_data |= 0x900;
114	writel(reg_data, iobase + PLX_INT_CSR_REG);
115
116	/* done with PLX IO access */
117	iounmap(iobase);
118	release_mem_region(mem_start, mem_length);
119
120	return 0;
121}
122
123static int isp1761_pci_probe(struct pci_dev *dev,
124		const struct pci_device_id *id)
125{
126	unsigned int devflags = 0;
127	int ret;
128
129	if (!dev->irq)
130		return -ENODEV;
131
132	if (pci_enable_device(dev) < 0)
133		return -ENODEV;
134
135	ret = isp1761_pci_init(dev);
136	if (ret < 0)
137		goto error;
138
139	pci_set_master(dev);
140
141	dev->dev.dma_mask = NULL;
142	ret = isp1760_register(&dev->resource[3], dev->irq, 0, &dev->dev,
143			       devflags);
144	if (ret < 0)
145		goto error;
146
147	return 0;
148
149error:
150	pci_disable_device(dev);
151	return ret;
152}
153
154static void isp1761_pci_remove(struct pci_dev *dev)
155{
156	isp1760_unregister(&dev->dev);
157
158	pci_disable_device(dev);
159}
160
161static void isp1761_pci_shutdown(struct pci_dev *dev)
162{
163	printk(KERN_ERR "ips1761_pci_shutdown\n");
164}
165
166static const struct pci_device_id isp1760_plx [] = {
167	{
168		.class          = PCI_CLASS_BRIDGE_OTHER << 8,
169		.class_mask     = ~0,
170		.vendor		= PCI_VENDOR_ID_PLX,
171		.device		= 0x5406,
172		.subvendor	= PCI_VENDOR_ID_PLX,
173		.subdevice	= 0x9054,
174	},
175	{ }
176};
177MODULE_DEVICE_TABLE(pci, isp1760_plx);
178
179static struct pci_driver isp1761_pci_driver = {
180	.name =         "isp1760",
181	.id_table =     isp1760_plx,
182	.probe =        isp1761_pci_probe,
183	.remove =       isp1761_pci_remove,
184	.shutdown =     isp1761_pci_shutdown,
185};
186#endif
187
188static int isp1760_plat_probe(struct platform_device *pdev)
189{
190	unsigned long irqflags;
191	unsigned int devflags = 0;
192	struct resource *mem_res;
193	struct resource *irq_res;
194	int ret;
195
196	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
197
198	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
199	if (!irq_res) {
200		pr_warning("isp1760: IRQ resource not available\n");
201		return -ENODEV;
202	}
203	irqflags = irq_res->flags & IRQF_TRIGGER_MASK;
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		/* Some systems wire up only 16 of the 32 data lines */
213		of_property_read_u32(dp, "bus-width", &bus_width);
214		if (bus_width == 16)
215			devflags |= ISP1760_FLAG_BUS_WIDTH_16;
216
217		if (of_property_read_bool(dp, "port1-otg"))
218			devflags |= ISP1760_FLAG_OTG_EN;
219
220		if (of_property_read_bool(dp, "analog-oc"))
221			devflags |= ISP1760_FLAG_ANALOG_OC;
222
223		if (of_property_read_bool(dp, "dack-polarity"))
224			devflags |= ISP1760_FLAG_DACK_POL_HIGH;
225
226		if (of_property_read_bool(dp, "dreq-polarity"))
227			devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
228	} else if (dev_get_platdata(&pdev->dev)) {
229		struct isp1760_platform_data *pdata =
230			dev_get_platdata(&pdev->dev);
231
232		if (pdata->is_isp1761)
233			devflags |= ISP1760_FLAG_ISP1761;
234		if (pdata->bus_width_16)
235			devflags |= ISP1760_FLAG_BUS_WIDTH_16;
236		if (pdata->port1_otg)
237			devflags |= ISP1760_FLAG_OTG_EN;
238		if (pdata->analog_oc)
239			devflags |= ISP1760_FLAG_ANALOG_OC;
240		if (pdata->dack_polarity_high)
241			devflags |= ISP1760_FLAG_DACK_POL_HIGH;
242		if (pdata->dreq_polarity_high)
243			devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
244	}
245
246	ret = isp1760_register(mem_res, irq_res->start, irqflags, &pdev->dev,
247			       devflags);
248	if (ret < 0)
249		return ret;
250
251	pr_info("ISP1760 USB device initialised\n");
252	return 0;
253}
254
255static int isp1760_plat_remove(struct platform_device *pdev)
256{
257	isp1760_unregister(&pdev->dev);
258
259	return 0;
260}
261
262#ifdef CONFIG_OF
263static const struct of_device_id isp1760_of_match[] = {
264	{ .compatible = "nxp,usb-isp1760", },
265	{ .compatible = "nxp,usb-isp1761", },
266	{ },
267};
268MODULE_DEVICE_TABLE(of, isp1760_of_match);
269#endif
270
271static struct platform_driver isp1760_plat_driver = {
272	.probe	= isp1760_plat_probe,
273	.remove	= isp1760_plat_remove,
274	.driver	= {
275		.name	= "isp1760",
276		.of_match_table = of_match_ptr(isp1760_of_match),
277	},
278};
279
280static int __init isp1760_init(void)
281{
282	int ret, any_ret = -ENODEV;
283
284	isp1760_init_kmem_once();
285
286	ret = platform_driver_register(&isp1760_plat_driver);
287	if (!ret)
288		any_ret = 0;
289#ifdef CONFIG_PCI
290	ret = pci_register_driver(&isp1761_pci_driver);
291	if (!ret)
292		any_ret = 0;
293#endif
294
295	if (any_ret)
296		isp1760_deinit_kmem_cache();
297	return any_ret;
298}
299module_init(isp1760_init);
300
301static void __exit isp1760_exit(void)
302{
303	platform_driver_unregister(&isp1760_plat_driver);
304#ifdef CONFIG_PCI
305	pci_unregister_driver(&isp1761_pci_driver);
306#endif
307	isp1760_deinit_kmem_cache();
308}
309module_exit(isp1760_exit);