1 // SPDX-License-Identifier: GPL-1.0+ 2 /* 3 * OHCI HCD (Host Controller Driver) for USB. 4 * 5 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> 6 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> 7 * (C) Copyright 2002 Hewlett-Packard Company 8 * 9 * SA1111 Bus Glue 10 * 11 * Written by Christopher Hoover <ch@hpl.hp.com> 12 * Based on fragments of previous driver by Russell King et al. 13 * 14 * This file is licenced under the GPL. 15 */ 16 17 #include <asm/mach-types.h> 18 #include <asm/hardware/sa1111.h> 19 20 #ifndef CONFIG_SA1111 21 #error "This file is SA-1111 bus glue. CONFIG_SA1111 must be defined." 22 #endif 23 24 #define USB_STATUS 0x0118 25 #define USB_RESET 0x011c 26 #define USB_IRQTEST 0x0120 27 28 #define USB_RESET_FORCEIFRESET (1 << 0) 29 #define USB_RESET_FORCEHCRESET (1 << 1) 30 #define USB_RESET_CLKGENRESET (1 << 2) 31 #define USB_RESET_SIMSCALEDOWN (1 << 3) 32 #define USB_RESET_USBINTTEST (1 << 4) 33 #define USB_RESET_SLEEPSTBYEN (1 << 5) 34 #define USB_RESET_PWRSENSELOW (1 << 6) 35 #define USB_RESET_PWRCTRLLOW (1 << 7) 36 37 #define USB_STATUS_IRQHCIRMTWKUP (1 << 7) 38 #define USB_STATUS_IRQHCIBUFFACC (1 << 8) 39 #define USB_STATUS_NIRQHCIM (1 << 9) 40 #define USB_STATUS_NHCIMFCLR (1 << 10) 41 #define USB_STATUS_USBPWRSENSE (1 << 11) 42 43 #if 0 44 static void dump_hci_status(struct usb_hcd *hcd, const char *label) 45 { 46 unsigned long status = readl_relaxed(hcd->regs + USB_STATUS); 47 48 printk(KERN_DEBUG "%s USB_STATUS = { %s%s%s%s%s}\n", label, 49 ((status & USB_STATUS_IRQHCIRMTWKUP) ? "IRQHCIRMTWKUP " : ""), 50 ((status & USB_STATUS_IRQHCIBUFFACC) ? "IRQHCIBUFFACC " : ""), 51 ((status & USB_STATUS_NIRQHCIM) ? "" : "IRQHCIM "), 52 ((status & USB_STATUS_NHCIMFCLR) ? "" : "HCIMFCLR "), 53 ((status & USB_STATUS_USBPWRSENSE) ? "USBPWRSENSE " : "")); 54 } 55 #endif 56 57 static int ohci_sa1111_reset(struct usb_hcd *hcd) 58 { 59 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 60 61 ohci_hcd_init(ohci); 62 return ohci_init(ohci); 63 } 64 65 static int ohci_sa1111_start(struct usb_hcd *hcd) 66 { 67 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 68 int ret; 69 70 ret = ohci_run(ohci); 71 if (ret < 0) { 72 ohci_err(ohci, "can't start\n"); 73 ohci_stop(hcd); 74 } 75 return ret; 76 } 77 78 static const struct hc_driver ohci_sa1111_hc_driver = { 79 .description = hcd_name, 80 .product_desc = "SA-1111 OHCI", 81 .hcd_priv_size = sizeof(struct ohci_hcd), 82 83 /* 84 * generic hardware linkage 85 */ 86 .irq = ohci_irq, 87 .flags = HCD_USB11 | HCD_DMA | HCD_MEMORY, 88 89 /* 90 * basic lifecycle operations 91 */ 92 .reset = ohci_sa1111_reset, 93 .start = ohci_sa1111_start, 94 .stop = ohci_stop, 95 .shutdown = ohci_shutdown, 96 97 /* 98 * managing i/o requests and associated device resources 99 */ 100 .urb_enqueue = ohci_urb_enqueue, 101 .urb_dequeue = ohci_urb_dequeue, 102 .endpoint_disable = ohci_endpoint_disable, 103 104 /* 105 * scheduling support 106 */ 107 .get_frame_number = ohci_get_frame, 108 109 /* 110 * root hub support 111 */ 112 .hub_status_data = ohci_hub_status_data, 113 .hub_control = ohci_hub_control, 114 #ifdef CONFIG_PM 115 .bus_suspend = ohci_bus_suspend, 116 .bus_resume = ohci_bus_resume, 117 #endif 118 .start_port_reset = ohci_start_port_reset, 119 }; 120 121 static int sa1111_start_hc(struct sa1111_dev *dev) 122 { 123 unsigned int usb_rst = 0; 124 int ret; 125 126 dev_dbg(&dev->dev, "starting SA-1111 OHCI USB Controller\n"); 127 128 if (machine_is_assabet()) 129 usb_rst = USB_RESET_PWRSENSELOW | USB_RESET_PWRCTRLLOW; 130 131 /* 132 * Configure the power sense and control lines. Place the USB 133 * host controller in reset. 134 */ 135 writel_relaxed(usb_rst | USB_RESET_FORCEIFRESET | USB_RESET_FORCEHCRESET, 136 dev->mapbase + USB_RESET); 137 138 /* 139 * Now, carefully enable the USB clock, and take 140 * the USB host controller out of reset. 141 */ 142 ret = sa1111_enable_device(dev); 143 if (ret == 0) { 144 udelay(11); 145 writel_relaxed(usb_rst, dev->mapbase + USB_RESET); 146 } 147 148 return ret; 149 } 150 151 static void sa1111_stop_hc(struct sa1111_dev *dev) 152 { 153 unsigned int usb_rst; 154 155 dev_dbg(&dev->dev, "stopping SA-1111 OHCI USB Controller\n"); 156 157 /* 158 * Put the USB host controller into reset. 159 */ 160 usb_rst = readl_relaxed(dev->mapbase + USB_RESET); 161 writel_relaxed(usb_rst | USB_RESET_FORCEIFRESET | USB_RESET_FORCEHCRESET, 162 dev->mapbase + USB_RESET); 163 164 /* 165 * Stop the USB clock. 166 */ 167 sa1111_disable_device(dev); 168 } 169 170 /** 171 * ohci_hcd_sa1111_probe - initialize SA-1111-based HCDs 172 * 173 * Allocates basic resources for this USB host controller, and 174 * then invokes the start() method for the HCD associated with it. 175 */ 176 static int ohci_hcd_sa1111_probe(struct sa1111_dev *dev) 177 { 178 struct usb_hcd *hcd; 179 int ret, irq; 180 181 if (usb_disabled()) 182 return -ENODEV; 183 184 /* 185 * We don't call dma_set_mask_and_coherent() here because the 186 * DMA mask has already been appropraitely setup by the core 187 * SA-1111 bus code (which includes bug workarounds.) 188 */ 189 190 hcd = usb_create_hcd(&ohci_sa1111_hc_driver, &dev->dev, "sa1111"); 191 if (!hcd) 192 return -ENOMEM; 193 194 hcd->rsrc_start = dev->res.start; 195 hcd->rsrc_len = resource_size(&dev->res); 196 197 irq = sa1111_get_irq(dev, 1); 198 if (irq <= 0) { 199 ret = irq ? : -ENXIO; 200 goto err1; 201 } 202 203 /* 204 * According to the "Intel StrongARM SA-1111 Microprocessor Companion 205 * Chip Specification Update" (June 2000), erratum #7, there is a 206 * significant bug in the SA1111 SDRAM shared memory controller. If 207 * an access to a region of memory above 1MB relative to the bank base, 208 * it is important that address bit 10 _NOT_ be asserted. Depending 209 * on the configuration of the RAM, bit 10 may correspond to one 210 * of several different (processor-relative) address bits. 211 * 212 * Section 4.6 of the "Intel StrongARM SA-1111 Development Module 213 * User's Guide" mentions that jumpers R51 and R52 control the 214 * target of SA-1111 DMA (either SDRAM bank 0 on Assabet, or 215 * SDRAM bank 1 on Neponset). The default configuration selects 216 * Assabet, so any address in bank 1 is necessarily invalid. 217 * 218 * As a workaround, use a bounce buffer in addressable memory 219 * as local_mem, relying on ZONE_DMA to provide an area that 220 * fits within the above constraints. 221 * 222 * SZ_64K is an estimate for what size this might need. 223 */ 224 ret = usb_hcd_setup_local_mem(hcd, 0, 0, SZ_64K); 225 if (ret) 226 goto err1; 227 228 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { 229 dev_dbg(&dev->dev, "request_mem_region failed\n"); 230 ret = -EBUSY; 231 goto err1; 232 } 233 234 hcd->regs = dev->mapbase; 235 236 ret = sa1111_start_hc(dev); 237 if (ret) 238 goto err2; 239 240 ret = usb_add_hcd(hcd, irq, 0); 241 if (ret == 0) { 242 device_wakeup_enable(hcd->self.controller); 243 return ret; 244 } 245 246 sa1111_stop_hc(dev); 247 err2: 248 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 249 err1: 250 usb_put_hcd(hcd); 251 return ret; 252 } 253 254 /** 255 * ohci_hcd_sa1111_remove - shutdown processing for SA-1111-based HCDs 256 * @dev: USB Host Controller being removed 257 * 258 * Reverses the effect of ohci_hcd_sa1111_probe(), first invoking 259 * the HCD's stop() method. 260 */ 261 static void ohci_hcd_sa1111_remove(struct sa1111_dev *dev) 262 { 263 struct usb_hcd *hcd = sa1111_get_drvdata(dev); 264 265 usb_remove_hcd(hcd); 266 sa1111_stop_hc(dev); 267 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 268 usb_put_hcd(hcd); 269 } 270 271 static void ohci_hcd_sa1111_shutdown(struct device *_dev) 272 { 273 struct sa1111_dev *dev = to_sa1111_device(_dev); 274 struct usb_hcd *hcd = sa1111_get_drvdata(dev); 275 276 if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) { 277 hcd->driver->shutdown(hcd); 278 sa1111_stop_hc(dev); 279 } 280 } 281 282 static struct sa1111_driver ohci_hcd_sa1111_driver = { 283 .drv = { 284 .name = "sa1111-ohci", 285 .owner = THIS_MODULE, 286 .shutdown = ohci_hcd_sa1111_shutdown, 287 }, 288 .devid = SA1111_DEVID_USB, 289 .probe = ohci_hcd_sa1111_probe, 290 .remove = ohci_hcd_sa1111_remove, 291 }; 292