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 * 11 */ 12 13 #include <linux/usb.h> 14 #include <linux/io.h> 15 #include <linux/module.h> 16 #include <linux/of.h> 17 #include <linux/platform_device.h> 18 #include <linux/slab.h> 19 #include <linux/usb/isp1760.h> 20 #include <linux/usb/hcd.h> 21 22 #include "isp1760-core.h" 23 #include "isp1760-regs.h" 24 25 #ifdef CONFIG_USB_PCI 26 #include <linux/pci.h> 27 #endif 28 29 #ifdef CONFIG_USB_PCI 30 static int isp1761_pci_init(struct pci_dev *dev) 31 { 32 resource_size_t mem_start; 33 resource_size_t mem_length; 34 u8 __iomem *iobase; 35 u8 latency, limit; 36 int retry_count; 37 u32 reg_data; 38 39 /* Grab the PLX PCI shared memory of the ISP 1761 we need */ 40 mem_start = pci_resource_start(dev, 3); 41 mem_length = pci_resource_len(dev, 3); 42 if (mem_length < 0xffff) { 43 printk(KERN_ERR "memory length for this resource is wrong\n"); 44 return -ENOMEM; 45 } 46 47 if (!request_mem_region(mem_start, mem_length, "ISP-PCI")) { 48 printk(KERN_ERR "host controller already in use\n"); 49 return -EBUSY; 50 } 51 52 /* map available memory */ 53 iobase = ioremap_nocache(mem_start, mem_length); 54 if (!iobase) { 55 printk(KERN_ERR "Error ioremap failed\n"); 56 release_mem_region(mem_start, mem_length); 57 return -ENOMEM; 58 } 59 60 /* bad pci latencies can contribute to overruns */ 61 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency); 62 if (latency) { 63 pci_read_config_byte(dev, PCI_MAX_LAT, &limit); 64 if (limit && limit < latency) 65 pci_write_config_byte(dev, PCI_LATENCY_TIMER, limit); 66 } 67 68 /* Try to check whether we can access Scratch Register of 69 * Host Controller or not. The initial PCI access is retried until 70 * local init for the PCI bridge is completed 71 */ 72 retry_count = 20; 73 reg_data = 0; 74 while ((reg_data != 0xFACE) && retry_count) { 75 /*by default host is in 16bit mode, so 76 * io operations at this stage must be 16 bit 77 * */ 78 writel(0xface, iobase + HC_SCRATCH_REG); 79 udelay(100); 80 reg_data = readl(iobase + HC_SCRATCH_REG) & 0x0000ffff; 81 retry_count--; 82 } 83 84 iounmap(iobase); 85 release_mem_region(mem_start, mem_length); 86 87 /* Host Controller presence is detected by writing to scratch register 88 * and reading back and checking the contents are same or not 89 */ 90 if (reg_data != 0xFACE) { 91 dev_err(&dev->dev, "scratch register mismatch %x\n", reg_data); 92 return -ENOMEM; 93 } 94 95 /* Grab the PLX PCI mem maped port start address we need */ 96 mem_start = pci_resource_start(dev, 0); 97 mem_length = pci_resource_len(dev, 0); 98 99 if (!request_mem_region(mem_start, mem_length, "ISP1761 IO MEM")) { 100 printk(KERN_ERR "request region #1\n"); 101 return -EBUSY; 102 } 103 104 iobase = ioremap_nocache(mem_start, mem_length); 105 if (!iobase) { 106 printk(KERN_ERR "ioremap #1\n"); 107 release_mem_region(mem_start, mem_length); 108 return -ENOMEM; 109 } 110 111 /* configure PLX PCI chip to pass interrupts */ 112 #define PLX_INT_CSR_REG 0x68 113 reg_data = readl(iobase + PLX_INT_CSR_REG); 114 reg_data |= 0x900; 115 writel(reg_data, iobase + PLX_INT_CSR_REG); 116 117 /* done with PLX IO access */ 118 iounmap(iobase); 119 release_mem_region(mem_start, mem_length); 120 121 return 0; 122 } 123 124 static int isp1761_pci_probe(struct pci_dev *dev, 125 const struct pci_device_id *id) 126 { 127 unsigned int devflags = 0; 128 int ret; 129 130 if (!dev->irq) 131 return -ENODEV; 132 133 if (pci_enable_device(dev) < 0) 134 return -ENODEV; 135 136 ret = isp1761_pci_init(dev); 137 if (ret < 0) 138 goto error; 139 140 pci_set_master(dev); 141 142 ret = isp1760_register(&dev->resource[3], dev->irq, 0, &dev->dev, 143 devflags); 144 if (ret < 0) 145 goto error; 146 147 return 0; 148 149 error: 150 pci_disable_device(dev); 151 return ret; 152 } 153 154 static void isp1761_pci_remove(struct pci_dev *dev) 155 { 156 isp1760_unregister(&dev->dev); 157 158 pci_disable_device(dev); 159 } 160 161 static void isp1761_pci_shutdown(struct pci_dev *dev) 162 { 163 printk(KERN_ERR "ips1761_pci_shutdown\n"); 164 } 165 166 static 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 }; 177 MODULE_DEVICE_TABLE(pci, isp1760_plx); 178 179 static 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 187 188 static 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_warn("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 } 254 255 static int isp1760_plat_remove(struct platform_device *pdev) 256 { 257 isp1760_unregister(&pdev->dev); 258 259 return 0; 260 } 261 262 #ifdef CONFIG_OF 263 static const struct of_device_id isp1760_of_match[] = { 264 { .compatible = "nxp,usb-isp1760", }, 265 { .compatible = "nxp,usb-isp1761", }, 266 { }, 267 }; 268 MODULE_DEVICE_TABLE(of, isp1760_of_match); 269 #endif 270 271 static 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 }; 279 280 static 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_USB_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 } 299 module_init(isp1760_init); 300 301 static void __exit isp1760_exit(void) 302 { 303 platform_driver_unregister(&isp1760_plat_driver); 304 #ifdef CONFIG_USB_PCI 305 pci_unregister_driver(&isp1761_pci_driver); 306 #endif 307 isp1760_deinit_kmem_cache(); 308 } 309 module_exit(isp1760_exit); 310