1/* 2 * EHCI HCD (Host Controller Driver) for USB. 3 * 4 * Bus Glue for AMD Alchemy Au1xxx 5 * 6 * Based on "ohci-au1xxx.c" by Matt Porter <mporter@kernel.crashing.org> 7 * 8 * Modified for AMD Alchemy Au1200 EHC 9 * by K.Boge <karsten.boge@amd.com> 10 * 11 * This file is licenced under the GPL. 12 */ 13 14#include <linux/platform_device.h> 15#include <asm/mach-au1x00/au1000.h> 16 17#define USB_HOST_CONFIG (USB_MSR_BASE + USB_MSR_MCFG) 18#define USB_MCFG_PFEN (1<<31) 19#define USB_MCFG_RDCOMB (1<<30) 20#define USB_MCFG_SSDEN (1<<23) 21#define USB_MCFG_PHYPLLEN (1<<19) 22#define USB_MCFG_UCECLKEN (1<<18) 23#define USB_MCFG_EHCCLKEN (1<<17) 24#ifdef CONFIG_DMA_COHERENT 25#define USB_MCFG_UCAM (1<<7) 26#else 27#define USB_MCFG_UCAM (0) 28#endif 29#define USB_MCFG_EBMEN (1<<3) 30#define USB_MCFG_EMEMEN (1<<2) 31 32#define USBH_ENABLE_CE (USB_MCFG_PHYPLLEN | USB_MCFG_EHCCLKEN) 33#define USBH_ENABLE_INIT (USB_MCFG_PFEN | USB_MCFG_RDCOMB | \ 34 USBH_ENABLE_CE | USB_MCFG_SSDEN | \ 35 USB_MCFG_UCAM | USB_MCFG_EBMEN | \ 36 USB_MCFG_EMEMEN) 37 38#define USBH_DISABLE (USB_MCFG_EBMEN | USB_MCFG_EMEMEN) 39 40extern int usb_disabled(void); 41 42static void au1xxx_start_ehc(void) 43{ 44 /* enable clock to EHCI block and HS PHY PLL*/ 45 au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_CE, USB_HOST_CONFIG); 46 au_sync(); 47 udelay(1000); 48 49 /* enable EHCI mmio */ 50 au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_INIT, USB_HOST_CONFIG); 51 au_sync(); 52 udelay(1000); 53} 54 55static void au1xxx_stop_ehc(void) 56{ 57 unsigned long c; 58 59 /* Disable mem */ 60 au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_DISABLE, USB_HOST_CONFIG); 61 au_sync(); 62 udelay(1000); 63 64 /* Disable EHC clock. If the HS PHY is unused disable it too. */ 65 c = au_readl(USB_HOST_CONFIG) & ~USB_MCFG_EHCCLKEN; 66 if (!(c & USB_MCFG_UCECLKEN)) /* UDC disabled? */ 67 c &= ~USB_MCFG_PHYPLLEN; /* yes: disable HS PHY PLL */ 68 au_writel(c, USB_HOST_CONFIG); 69 au_sync(); 70} 71 72static int au1xxx_ehci_setup(struct usb_hcd *hcd) 73{ 74 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 75 int ret = ehci_init(hcd); 76 77 ehci->need_io_watchdog = 0; 78 return ret; 79} 80 81static const struct hc_driver ehci_au1xxx_hc_driver = { 82 .description = hcd_name, 83 .product_desc = "Au1xxx EHCI", 84 .hcd_priv_size = sizeof(struct ehci_hcd), 85 86 /* 87 * generic hardware linkage 88 */ 89 .irq = ehci_irq, 90 .flags = HCD_MEMORY | HCD_USB2, 91 92 .reset = au1xxx_ehci_setup, 93 .start = ehci_run, 94 .stop = ehci_stop, 95 .shutdown = ehci_shutdown, 96 97 /* 98 * managing i/o requests and associated device resources 99 */ 100 .urb_enqueue = ehci_urb_enqueue, 101 .urb_dequeue = ehci_urb_dequeue, 102 .endpoint_disable = ehci_endpoint_disable, 103 .endpoint_reset = ehci_endpoint_reset, 104 105 /* 106 * scheduling support 107 */ 108 .get_frame_number = ehci_get_frame, 109 110 /* 111 * root hub support 112 */ 113 .hub_status_data = ehci_hub_status_data, 114 .hub_control = ehci_hub_control, 115 .bus_suspend = ehci_bus_suspend, 116 .bus_resume = ehci_bus_resume, 117 .relinquish_port = ehci_relinquish_port, 118 .port_handed_over = ehci_port_handed_over, 119 120 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, 121}; 122 123static int ehci_hcd_au1xxx_drv_probe(struct platform_device *pdev) 124{ 125 struct usb_hcd *hcd; 126 struct ehci_hcd *ehci; 127 struct resource *res; 128 int ret; 129 130 if (usb_disabled()) 131 return -ENODEV; 132 133#if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT) 134 /* Au1200 AB USB does not support coherent memory */ 135 if (!(read_c0_prid() & 0xff)) { 136 printk(KERN_INFO "%s: this is chip revision AB!\n", pdev->name); 137 printk(KERN_INFO "%s: update your board or re-configure" 138 " the kernel\n", pdev->name); 139 return -ENODEV; 140 } 141#endif 142 143 if (pdev->resource[1].flags != IORESOURCE_IRQ) { 144 pr_debug("resource[1] is not IORESOURCE_IRQ"); 145 return -ENOMEM; 146 } 147 hcd = usb_create_hcd(&ehci_au1xxx_hc_driver, &pdev->dev, "Au1xxx"); 148 if (!hcd) 149 return -ENOMEM; 150 151 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 152 hcd->rsrc_start = res->start; 153 hcd->rsrc_len = resource_size(res); 154 155 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { 156 pr_debug("request_mem_region failed"); 157 ret = -EBUSY; 158 goto err1; 159 } 160 161 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 162 if (!hcd->regs) { 163 pr_debug("ioremap failed"); 164 ret = -ENOMEM; 165 goto err2; 166 } 167 168 au1xxx_start_ehc(); 169 170 ehci = hcd_to_ehci(hcd); 171 ehci->caps = hcd->regs; 172 ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase)); 173 /* cache this readonly data; minimize chip reads */ 174 ehci->hcs_params = readl(&ehci->caps->hcs_params); 175 176 ret = usb_add_hcd(hcd, pdev->resource[1].start, 177 IRQF_DISABLED | IRQF_SHARED); 178 if (ret == 0) { 179 platform_set_drvdata(pdev, hcd); 180 return ret; 181 } 182 183 au1xxx_stop_ehc(); 184 iounmap(hcd->regs); 185err2: 186 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 187err1: 188 usb_put_hcd(hcd); 189 return ret; 190} 191 192static int ehci_hcd_au1xxx_drv_remove(struct platform_device *pdev) 193{ 194 struct usb_hcd *hcd = platform_get_drvdata(pdev); 195 196 usb_remove_hcd(hcd); 197 iounmap(hcd->regs); 198 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 199 usb_put_hcd(hcd); 200 au1xxx_stop_ehc(); 201 platform_set_drvdata(pdev, NULL); 202 203 return 0; 204} 205 206#ifdef CONFIG_PM 207static int ehci_hcd_au1xxx_drv_suspend(struct device *dev) 208{ 209 struct usb_hcd *hcd = dev_get_drvdata(dev); 210 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 211 unsigned long flags; 212 int rc; 213 214 return 0; 215 rc = 0; 216 217 if (time_before(jiffies, ehci->next_statechange)) 218 msleep(10); 219 220 /* Root hub was already suspended. Disable irq emission and 221 * mark HW unaccessible. The PM and USB cores make sure that 222 * the root hub is either suspended or stopped. 223 */ 224 ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev)); 225 spin_lock_irqsave(&ehci->lock, flags); 226 ehci_writel(ehci, 0, &ehci->regs->intr_enable); 227 (void)ehci_readl(ehci, &ehci->regs->intr_enable); 228 229 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 230 231 au1xxx_stop_ehc(); 232 spin_unlock_irqrestore(&ehci->lock, flags); 233 234 // could save FLADJ in case of Vaux power loss 235 // ... we'd only use it to handle clock skew 236 237 return rc; 238} 239 240static int ehci_hcd_au1xxx_drv_resume(struct device *dev) 241{ 242 struct usb_hcd *hcd = dev_get_drvdata(dev); 243 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 244 245 au1xxx_start_ehc(); 246 247 // maybe restore FLADJ 248 249 if (time_before(jiffies, ehci->next_statechange)) 250 msleep(100); 251 252 /* Mark hardware accessible again as we are out of D3 state by now */ 253 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 254 255 /* If CF is still set, we maintained PCI Vaux power. 256 * Just undo the effect of ehci_pci_suspend(). 257 */ 258 if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) { 259 int mask = INTR_MASK; 260 261 ehci_prepare_ports_for_controller_resume(ehci); 262 if (!hcd->self.root_hub->do_remote_wakeup) 263 mask &= ~STS_PCD; 264 ehci_writel(ehci, mask, &ehci->regs->intr_enable); 265 ehci_readl(ehci, &ehci->regs->intr_enable); 266 return 0; 267 } 268 269 ehci_dbg(ehci, "lost power, restarting\n"); 270 usb_root_hub_lost_power(hcd->self.root_hub); 271 272 /* Else reset, to cope with power loss or flush-to-storage 273 * style "resume" having let BIOS kick in during reboot. 274 */ 275 (void) ehci_halt(ehci); 276 (void) ehci_reset(ehci); 277 278 /* emptying the schedule aborts any urbs */ 279 spin_lock_irq(&ehci->lock); 280 if (ehci->reclaim) 281 end_unlink_async(ehci); 282 ehci_work(ehci); 283 spin_unlock_irq(&ehci->lock); 284 285 ehci_writel(ehci, ehci->command, &ehci->regs->command); 286 ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag); 287 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */ 288 289 /* here we "know" root ports should always stay powered */ 290 ehci_port_power(ehci, 1); 291 292 hcd->state = HC_STATE_SUSPENDED; 293 294 return 0; 295} 296 297static const struct dev_pm_ops au1xxx_ehci_pmops = { 298 .suspend = ehci_hcd_au1xxx_drv_suspend, 299 .resume = ehci_hcd_au1xxx_drv_resume, 300}; 301 302#define AU1XXX_EHCI_PMOPS &au1xxx_ehci_pmops 303 304#else 305#define AU1XXX_EHCI_PMOPS NULL 306#endif 307 308static struct platform_driver ehci_hcd_au1xxx_driver = { 309 .probe = ehci_hcd_au1xxx_drv_probe, 310 .remove = ehci_hcd_au1xxx_drv_remove, 311 .shutdown = usb_hcd_platform_shutdown, 312 .driver = { 313 .name = "au1xxx-ehci", 314 .owner = THIS_MODULE, 315 .pm = AU1XXX_EHCI_PMOPS, 316 } 317}; 318 319MODULE_ALIAS("platform:au1xxx-ehci"); 320