| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Glue code for the ISP1760 driver and bus |
| * Currently there is support for |
| * - OpenFirmware |
| * - PCI |
| * - PDEV (generic platform device centralized driver model) |
| * |
| * (c) 2007 Sebastian Siewior <bigeasy@linutronix.de> |
| * |
| */ |
| |
| #include <linux/usb.h> |
| #include <linux/io.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/platform_device.h> |
| #include <linux/slab.h> |
| #include <linux/usb/isp1760.h> |
| #include <linux/usb/hcd.h> |
| |
| #include "isp1760-core.h" |
| #include "isp1760-regs.h" |
| |
| #ifdef CONFIG_USB_PCI |
| #include <linux/pci.h> |
| #endif |
| |
| #ifdef CONFIG_USB_PCI |
| static int isp1761_pci_init(struct pci_dev *dev) |
| { |
| resource_size_t mem_start; |
| resource_size_t mem_length; |
| u8 __iomem *iobase; |
| u8 latency, limit; |
| int retry_count; |
| u32 reg_data; |
| |
| /* Grab the PLX PCI shared memory of the ISP 1761 we need */ |
| mem_start = pci_resource_start(dev, 3); |
| mem_length = pci_resource_len(dev, 3); |
| if (mem_length < 0xffff) { |
| printk(KERN_ERR "memory length for this resource is wrong\n"); |
| return -ENOMEM; |
| } |
| |
| if (!request_mem_region(mem_start, mem_length, "ISP-PCI")) { |
| printk(KERN_ERR "host controller already in use\n"); |
| return -EBUSY; |
| } |
| |
| /* map available memory */ |
| iobase = ioremap_nocache(mem_start, mem_length); |
| if (!iobase) { |
| printk(KERN_ERR "Error ioremap failed\n"); |
| release_mem_region(mem_start, mem_length); |
| return -ENOMEM; |
| } |
| |
| /* bad pci latencies can contribute to overruns */ |
| pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency); |
| if (latency) { |
| pci_read_config_byte(dev, PCI_MAX_LAT, &limit); |
| if (limit && limit < latency) |
| pci_write_config_byte(dev, PCI_LATENCY_TIMER, limit); |
| } |
| |
| /* Try to check whether we can access Scratch Register of |
| * Host Controller or not. The initial PCI access is retried until |
| * local init for the PCI bridge is completed |
| */ |
| retry_count = 20; |
| reg_data = 0; |
| while ((reg_data != 0xFACE) && retry_count) { |
| /*by default host is in 16bit mode, so |
| * io operations at this stage must be 16 bit |
| * */ |
| writel(0xface, iobase + HC_SCRATCH_REG); |
| udelay(100); |
| reg_data = readl(iobase + HC_SCRATCH_REG) & 0x0000ffff; |
| retry_count--; |
| } |
| |
| iounmap(iobase); |
| release_mem_region(mem_start, mem_length); |
| |
| /* Host Controller presence is detected by writing to scratch register |
| * and reading back and checking the contents are same or not |
| */ |
| if (reg_data != 0xFACE) { |
| dev_err(&dev->dev, "scratch register mismatch %x\n", reg_data); |
| return -ENOMEM; |
| } |
| |
| /* Grab the PLX PCI mem maped port start address we need */ |
| mem_start = pci_resource_start(dev, 0); |
| mem_length = pci_resource_len(dev, 0); |
| |
| if (!request_mem_region(mem_start, mem_length, "ISP1761 IO MEM")) { |
| printk(KERN_ERR "request region #1\n"); |
| return -EBUSY; |
| } |
| |
| iobase = ioremap_nocache(mem_start, mem_length); |
| if (!iobase) { |
| printk(KERN_ERR "ioremap #1\n"); |
| release_mem_region(mem_start, mem_length); |
| return -ENOMEM; |
| } |
| |
| /* configure PLX PCI chip to pass interrupts */ |
| #define PLX_INT_CSR_REG 0x68 |
| reg_data = readl(iobase + PLX_INT_CSR_REG); |
| reg_data |= 0x900; |
| writel(reg_data, iobase + PLX_INT_CSR_REG); |
| |
| /* done with PLX IO access */ |
| iounmap(iobase); |
| release_mem_region(mem_start, mem_length); |
| |
| return 0; |
| } |
| |
| static int isp1761_pci_probe(struct pci_dev *dev, |
| const struct pci_device_id *id) |
| { |
| unsigned int devflags = 0; |
| int ret; |
| |
| if (!dev->irq) |
| return -ENODEV; |
| |
| if (pci_enable_device(dev) < 0) |
| return -ENODEV; |
| |
| ret = isp1761_pci_init(dev); |
| if (ret < 0) |
| goto error; |
| |
| pci_set_master(dev); |
| |
| dev->dev.dma_mask = NULL; |
| ret = isp1760_register(&dev->resource[3], dev->irq, 0, &dev->dev, |
| devflags); |
| if (ret < 0) |
| goto error; |
| |
| return 0; |
| |
| error: |
| pci_disable_device(dev); |
| return ret; |
| } |
| |
| static void isp1761_pci_remove(struct pci_dev *dev) |
| { |
| isp1760_unregister(&dev->dev); |
| |
| pci_disable_device(dev); |
| } |
| |
| static void isp1761_pci_shutdown(struct pci_dev *dev) |
| { |
| printk(KERN_ERR "ips1761_pci_shutdown\n"); |
| } |
| |
| static const struct pci_device_id isp1760_plx[] = { |
| { |
| .class = PCI_CLASS_BRIDGE_OTHER << 8, |
| .class_mask = ~0, |
| .vendor = PCI_VENDOR_ID_PLX, |
| .device = 0x5406, |
| .subvendor = PCI_VENDOR_ID_PLX, |
| .subdevice = 0x9054, |
| }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(pci, isp1760_plx); |
| |
| static struct pci_driver isp1761_pci_driver = { |
| .name = "isp1760", |
| .id_table = isp1760_plx, |
| .probe = isp1761_pci_probe, |
| .remove = isp1761_pci_remove, |
| .shutdown = isp1761_pci_shutdown, |
| }; |
| #endif |
| |
| static int isp1760_plat_probe(struct platform_device *pdev) |
| { |
| unsigned long irqflags; |
| unsigned int devflags = 0; |
| struct resource *mem_res; |
| struct resource *irq_res; |
| int ret; |
| |
| mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| |
| irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
| if (!irq_res) { |
| pr_warn("isp1760: IRQ resource not available\n"); |
| return -ENODEV; |
| } |
| irqflags = irq_res->flags & IRQF_TRIGGER_MASK; |
| |
| if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) { |
| struct device_node *dp = pdev->dev.of_node; |
| u32 bus_width = 0; |
| |
| if (of_device_is_compatible(dp, "nxp,usb-isp1761")) |
| devflags |= ISP1760_FLAG_ISP1761; |
| |
| /* Some systems wire up only 16 of the 32 data lines */ |
| of_property_read_u32(dp, "bus-width", &bus_width); |
| if (bus_width == 16) |
| devflags |= ISP1760_FLAG_BUS_WIDTH_16; |
| |
| if (of_property_read_bool(dp, "port1-otg")) |
| devflags |= ISP1760_FLAG_OTG_EN; |
| |
| if (of_property_read_bool(dp, "analog-oc")) |
| devflags |= ISP1760_FLAG_ANALOG_OC; |
| |
| if (of_property_read_bool(dp, "dack-polarity")) |
| devflags |= ISP1760_FLAG_DACK_POL_HIGH; |
| |
| if (of_property_read_bool(dp, "dreq-polarity")) |
| devflags |= ISP1760_FLAG_DREQ_POL_HIGH; |
| } else if (dev_get_platdata(&pdev->dev)) { |
| struct isp1760_platform_data *pdata = |
| dev_get_platdata(&pdev->dev); |
| |
| if (pdata->is_isp1761) |
| devflags |= ISP1760_FLAG_ISP1761; |
| if (pdata->bus_width_16) |
| devflags |= ISP1760_FLAG_BUS_WIDTH_16; |
| if (pdata->port1_otg) |
| devflags |= ISP1760_FLAG_OTG_EN; |
| if (pdata->analog_oc) |
| devflags |= ISP1760_FLAG_ANALOG_OC; |
| if (pdata->dack_polarity_high) |
| devflags |= ISP1760_FLAG_DACK_POL_HIGH; |
| if (pdata->dreq_polarity_high) |
| devflags |= ISP1760_FLAG_DREQ_POL_HIGH; |
| } |
| |
| ret = isp1760_register(mem_res, irq_res->start, irqflags, &pdev->dev, |
| devflags); |
| if (ret < 0) |
| return ret; |
| |
| pr_info("ISP1760 USB device initialised\n"); |
| return 0; |
| } |
| |
| static int isp1760_plat_remove(struct platform_device *pdev) |
| { |
| isp1760_unregister(&pdev->dev); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_OF |
| static const struct of_device_id isp1760_of_match[] = { |
| { .compatible = "nxp,usb-isp1760", }, |
| { .compatible = "nxp,usb-isp1761", }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(of, isp1760_of_match); |
| #endif |
| |
| static struct platform_driver isp1760_plat_driver = { |
| .probe = isp1760_plat_probe, |
| .remove = isp1760_plat_remove, |
| .driver = { |
| .name = "isp1760", |
| .of_match_table = of_match_ptr(isp1760_of_match), |
| }, |
| }; |
| |
| static int __init isp1760_init(void) |
| { |
| int ret, any_ret = -ENODEV; |
| |
| isp1760_init_kmem_once(); |
| |
| ret = platform_driver_register(&isp1760_plat_driver); |
| if (!ret) |
| any_ret = 0; |
| #ifdef CONFIG_USB_PCI |
| ret = pci_register_driver(&isp1761_pci_driver); |
| if (!ret) |
| any_ret = 0; |
| #endif |
| |
| if (any_ret) |
| isp1760_deinit_kmem_cache(); |
| return any_ret; |
| } |
| module_init(isp1760_init); |
| |
| static void __exit isp1760_exit(void) |
| { |
| platform_driver_unregister(&isp1760_plat_driver); |
| #ifdef CONFIG_USB_PCI |
| pci_unregister_driver(&isp1761_pci_driver); |
| #endif |
| isp1760_deinit_kmem_cache(); |
| } |
| module_exit(isp1760_exit); |