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 dev->dev.dma_mask = NULL; 143 ret = isp1760_register(&dev->resource[3], dev->irq, 0, &dev->dev, 144 devflags); 145 if (ret < 0) 146 goto error; 147 148 return 0; 149 150 error: 151 pci_disable_device(dev); 152 return ret; 153 } 154 155 static void isp1761_pci_remove(struct pci_dev *dev) 156 { 157 isp1760_unregister(&dev->dev); 158 159 pci_disable_device(dev); 160 } 161 162 static void isp1761_pci_shutdown(struct pci_dev *dev) 163 { 164 printk(KERN_ERR "ips1761_pci_shutdown\n"); 165 } 166 167 static const struct pci_device_id isp1760_plx[] = { 168 { 169 .class = PCI_CLASS_BRIDGE_OTHER << 8, 170 .class_mask = ~0, 171 .vendor = PCI_VENDOR_ID_PLX, 172 .device = 0x5406, 173 .subvendor = PCI_VENDOR_ID_PLX, 174 .subdevice = 0x9054, 175 }, 176 { } 177 }; 178 MODULE_DEVICE_TABLE(pci, isp1760_plx); 179 180 static struct pci_driver isp1761_pci_driver = { 181 .name = "isp1760", 182 .id_table = isp1760_plx, 183 .probe = isp1761_pci_probe, 184 .remove = isp1761_pci_remove, 185 .shutdown = isp1761_pci_shutdown, 186 }; 187 #endif 188 189 static int isp1760_plat_probe(struct platform_device *pdev) 190 { 191 unsigned long irqflags; 192 unsigned int devflags = 0; 193 struct resource *mem_res; 194 struct resource *irq_res; 195 int ret; 196 197 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 198 199 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 200 if (!irq_res) { 201 pr_warn("isp1760: IRQ resource not available\n"); 202 return -ENODEV; 203 } 204 irqflags = irq_res->flags & IRQF_TRIGGER_MASK; 205 206 if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) { 207 struct device_node *dp = pdev->dev.of_node; 208 u32 bus_width = 0; 209 210 if (of_device_is_compatible(dp, "nxp,usb-isp1761")) 211 devflags |= ISP1760_FLAG_ISP1761; 212 213 /* Some systems wire up only 16 of the 32 data lines */ 214 of_property_read_u32(dp, "bus-width", &bus_width); 215 if (bus_width == 16) 216 devflags |= ISP1760_FLAG_BUS_WIDTH_16; 217 218 if (of_property_read_bool(dp, "port1-otg")) 219 devflags |= ISP1760_FLAG_OTG_EN; 220 221 if (of_property_read_bool(dp, "analog-oc")) 222 devflags |= ISP1760_FLAG_ANALOG_OC; 223 224 if (of_property_read_bool(dp, "dack-polarity")) 225 devflags |= ISP1760_FLAG_DACK_POL_HIGH; 226 227 if (of_property_read_bool(dp, "dreq-polarity")) 228 devflags |= ISP1760_FLAG_DREQ_POL_HIGH; 229 } else if (dev_get_platdata(&pdev->dev)) { 230 struct isp1760_platform_data *pdata = 231 dev_get_platdata(&pdev->dev); 232 233 if (pdata->is_isp1761) 234 devflags |= ISP1760_FLAG_ISP1761; 235 if (pdata->bus_width_16) 236 devflags |= ISP1760_FLAG_BUS_WIDTH_16; 237 if (pdata->port1_otg) 238 devflags |= ISP1760_FLAG_OTG_EN; 239 if (pdata->analog_oc) 240 devflags |= ISP1760_FLAG_ANALOG_OC; 241 if (pdata->dack_polarity_high) 242 devflags |= ISP1760_FLAG_DACK_POL_HIGH; 243 if (pdata->dreq_polarity_high) 244 devflags |= ISP1760_FLAG_DREQ_POL_HIGH; 245 } 246 247 ret = isp1760_register(mem_res, irq_res->start, irqflags, &pdev->dev, 248 devflags); 249 if (ret < 0) 250 return ret; 251 252 pr_info("ISP1760 USB device initialised\n"); 253 return 0; 254 } 255 256 static int isp1760_plat_remove(struct platform_device *pdev) 257 { 258 isp1760_unregister(&pdev->dev); 259 260 return 0; 261 } 262 263 #ifdef CONFIG_OF 264 static const struct of_device_id isp1760_of_match[] = { 265 { .compatible = "nxp,usb-isp1760", }, 266 { .compatible = "nxp,usb-isp1761", }, 267 { }, 268 }; 269 MODULE_DEVICE_TABLE(of, isp1760_of_match); 270 #endif 271 272 static struct platform_driver isp1760_plat_driver = { 273 .probe = isp1760_plat_probe, 274 .remove = isp1760_plat_remove, 275 .driver = { 276 .name = "isp1760", 277 .of_match_table = of_match_ptr(isp1760_of_match), 278 }, 279 }; 280 281 static int __init isp1760_init(void) 282 { 283 int ret, any_ret = -ENODEV; 284 285 isp1760_init_kmem_once(); 286 287 ret = platform_driver_register(&isp1760_plat_driver); 288 if (!ret) 289 any_ret = 0; 290 #ifdef CONFIG_USB_PCI 291 ret = pci_register_driver(&isp1761_pci_driver); 292 if (!ret) 293 any_ret = 0; 294 #endif 295 296 if (any_ret) 297 isp1760_deinit_kmem_cache(); 298 return any_ret; 299 } 300 module_init(isp1760_init); 301 302 static void __exit isp1760_exit(void) 303 { 304 platform_driver_unregister(&isp1760_plat_driver); 305 #ifdef CONFIG_USB_PCI 306 pci_unregister_driver(&isp1761_pci_driver); 307 #endif 308 isp1760_deinit_kmem_cache(); 309 } 310 module_exit(isp1760_exit); 311