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 * Copyright 2021 Linaro, Rui Miguel Silva <rui.silva@linaro.org> 11 * 12 */ 13 14 #include <linux/usb.h> 15 #include <linux/io.h> 16 #include <linux/module.h> 17 #include <linux/of.h> 18 #include <linux/platform_device.h> 19 #include <linux/slab.h> 20 #include <linux/usb/hcd.h> 21 #include <linux/usb/otg.h> 22 23 #include "isp1760-core.h" 24 #include "isp1760-regs.h" 25 26 #ifdef CONFIG_USB_PCI 27 #include <linux/pci.h> 28 #endif 29 30 #ifdef CONFIG_USB_PCI 31 static int isp1761_pci_init(struct pci_dev *dev) 32 { 33 resource_size_t mem_start; 34 resource_size_t mem_length; 35 u8 __iomem *iobase; 36 u8 latency, limit; 37 int retry_count; 38 u32 reg_data; 39 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"); 45 return -ENOMEM; 46 } 47 48 if (!request_mem_region(mem_start, mem_length, "ISP-PCI")) { 49 printk(KERN_ERR "host controller already in use\n"); 50 return -EBUSY; 51 } 52 53 /* map available memory */ 54 iobase = ioremap(mem_start, mem_length); 55 if (!iobase) { 56 printk(KERN_ERR "Error ioremap failed\n"); 57 release_mem_region(mem_start, mem_length); 58 return -ENOMEM; 59 } 60 61 /* bad pci latencies can contribute to overruns */ 62 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency); 63 if (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); 67 } 68 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 72 */ 73 retry_count = 20; 74 reg_data = 0; 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 78 * */ 79 writel(0xface, iobase + ISP176x_HC_SCRATCH); 80 udelay(100); 81 reg_data = readl(iobase + ISP176x_HC_SCRATCH) & 0x0000ffff; 82 retry_count--; 83 } 84 85 iounmap(iobase); 86 release_mem_region(mem_start, mem_length); 87 88 /* Host Controller presence is detected by writing to scratch register 89 * and reading back and checking the contents are same or not 90 */ 91 if (reg_data != 0xFACE) { 92 dev_err(&dev->dev, "scratch register mismatch %x\n", reg_data); 93 return -ENOMEM; 94 } 95 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); 99 100 if (!request_mem_region(mem_start, mem_length, "ISP1761 IO MEM")) { 101 printk(KERN_ERR "request region #1\n"); 102 return -EBUSY; 103 } 104 105 iobase = ioremap(mem_start, mem_length); 106 if (!iobase) { 107 printk(KERN_ERR "ioremap #1\n"); 108 release_mem_region(mem_start, mem_length); 109 return -ENOMEM; 110 } 111 112 /* configure PLX PCI chip to pass interrupts */ 113 #define PLX_INT_CSR_REG 0x68 114 reg_data = readl(iobase + PLX_INT_CSR_REG); 115 reg_data |= 0x900; 116 writel(reg_data, iobase + PLX_INT_CSR_REG); 117 118 /* done with PLX IO access */ 119 iounmap(iobase); 120 release_mem_region(mem_start, mem_length); 121 122 return 0; 123 } 124 125 static int isp1761_pci_probe(struct pci_dev *dev, 126 const struct pci_device_id *id) 127 { 128 unsigned int devflags = 0; 129 int ret; 130 131 if (!dev->irq) 132 return -ENODEV; 133 134 if (pci_enable_device(dev) < 0) 135 return -ENODEV; 136 137 ret = isp1761_pci_init(dev); 138 if (ret < 0) 139 goto error; 140 141 pci_set_master(dev); 142 143 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 if (of_device_is_compatible(dp, "nxp,usb-isp1763")) 214 devflags |= ISP1760_FLAG_ISP1763; 215 216 /* 217 * Some systems wire up only 8 of 16 data lines or 218 * 16 of the 32 data lines 219 */ 220 of_property_read_u32(dp, "bus-width", &bus_width); 221 if (bus_width == 16) 222 devflags |= ISP1760_FLAG_BUS_WIDTH_16; 223 else if (bus_width == 8) 224 devflags |= ISP1760_FLAG_BUS_WIDTH_8; 225 226 if (usb_get_dr_mode(&pdev->dev) == USB_DR_MODE_PERIPHERAL) 227 devflags |= ISP1760_FLAG_PERIPHERAL_EN; 228 229 if (of_property_read_bool(dp, "analog-oc")) 230 devflags |= ISP1760_FLAG_ANALOG_OC; 231 232 if (of_property_read_bool(dp, "dack-polarity")) 233 devflags |= ISP1760_FLAG_DACK_POL_HIGH; 234 235 if (of_property_read_bool(dp, "dreq-polarity")) 236 devflags |= ISP1760_FLAG_DREQ_POL_HIGH; 237 } else { 238 pr_err("isp1760: no platform data\n"); 239 return -ENXIO; 240 } 241 242 ret = isp1760_register(mem_res, irq_res->start, irqflags, &pdev->dev, 243 devflags); 244 if (ret < 0) 245 return ret; 246 247 pr_info("ISP1760 USB device initialised\n"); 248 return 0; 249 } 250 251 static int isp1760_plat_remove(struct platform_device *pdev) 252 { 253 isp1760_unregister(&pdev->dev); 254 255 return 0; 256 } 257 258 #ifdef CONFIG_OF 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", }, 263 { }, 264 }; 265 MODULE_DEVICE_TABLE(of, isp1760_of_match); 266 #endif 267 268 static struct platform_driver isp1760_plat_driver = { 269 .probe = isp1760_plat_probe, 270 .remove = isp1760_plat_remove, 271 .driver = { 272 .name = "isp1760", 273 .of_match_table = of_match_ptr(isp1760_of_match), 274 }, 275 }; 276 277 static int __init isp1760_init(void) 278 { 279 int ret, any_ret = -ENODEV; 280 281 isp1760_init_kmem_once(); 282 283 ret = platform_driver_register(&isp1760_plat_driver); 284 if (!ret) 285 any_ret = 0; 286 #ifdef CONFIG_USB_PCI 287 ret = pci_register_driver(&isp1761_pci_driver); 288 if (!ret) 289 any_ret = 0; 290 #endif 291 292 if (any_ret) 293 isp1760_deinit_kmem_cache(); 294 return any_ret; 295 } 296 module_init(isp1760_init); 297 298 static void __exit isp1760_exit(void) 299 { 300 platform_driver_unregister(&isp1760_plat_driver); 301 #ifdef CONFIG_USB_PCI 302 pci_unregister_driver(&isp1761_pci_driver); 303 #endif 304 isp1760_deinit_kmem_cache(); 305 } 306 module_exit(isp1760_exit); 307