Deepak Sikri | c8c38de | 2010-11-10 14:33:18 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Driver for EHCI HCD on SPEAR SOC |
| 3 | * |
| 4 | * Copyright (C) 2010 ST Micro Electronics, |
| 5 | * Deepak Sikri <deepak.sikri@st.com> |
| 6 | * |
| 7 | * Based on various ehci-*.c drivers |
| 8 | * |
| 9 | * This file is subject to the terms and conditions of the GNU General Public |
| 10 | * License. See the file COPYING in the main directory of this archive for |
| 11 | * more details. |
| 12 | */ |
| 13 | |
Deepak Sikri | c8c38de | 2010-11-10 14:33:18 +0530 | [diff] [blame] | 14 | #include <linux/clk.h> |
Deepak Sikri | 8c1b369 | 2012-02-24 14:49:31 +0530 | [diff] [blame^] | 15 | #include <linux/jiffies.h> |
| 16 | #include <linux/platform_device.h> |
| 17 | #include <linux/pm.h> |
Deepak Sikri | c8c38de | 2010-11-10 14:33:18 +0530 | [diff] [blame] | 18 | |
| 19 | struct spear_ehci { |
| 20 | struct ehci_hcd ehci; |
| 21 | struct clk *clk; |
| 22 | }; |
| 23 | |
| 24 | #define to_spear_ehci(hcd) (struct spear_ehci *)hcd_to_ehci(hcd) |
| 25 | |
| 26 | static void spear_start_ehci(struct spear_ehci *ehci) |
| 27 | { |
| 28 | clk_enable(ehci->clk); |
| 29 | } |
| 30 | |
| 31 | static void spear_stop_ehci(struct spear_ehci *ehci) |
| 32 | { |
| 33 | clk_disable(ehci->clk); |
| 34 | } |
| 35 | |
| 36 | static int ehci_spear_setup(struct usb_hcd *hcd) |
| 37 | { |
| 38 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
| 39 | int retval = 0; |
| 40 | |
| 41 | /* registers start at offset 0x0 */ |
| 42 | ehci->caps = hcd->regs; |
Jan Andersson | c430131 | 2011-05-03 20:11:57 +0200 | [diff] [blame] | 43 | ehci->regs = hcd->regs + HC_LENGTH(ehci, ehci_readl(ehci, |
Deepak Sikri | c8c38de | 2010-11-10 14:33:18 +0530 | [diff] [blame] | 44 | &ehci->caps->hc_capbase)); |
| 45 | /* cache this readonly data; minimize chip reads */ |
| 46 | ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); |
| 47 | retval = ehci_halt(ehci); |
| 48 | if (retval) |
| 49 | return retval; |
| 50 | |
| 51 | retval = ehci_init(hcd); |
| 52 | if (retval) |
| 53 | return retval; |
| 54 | |
| 55 | ehci_reset(ehci); |
| 56 | ehci_port_power(ehci, 0); |
| 57 | |
| 58 | return retval; |
| 59 | } |
| 60 | |
| 61 | static const struct hc_driver ehci_spear_hc_driver = { |
| 62 | .description = hcd_name, |
| 63 | .product_desc = "SPEAr EHCI", |
| 64 | .hcd_priv_size = sizeof(struct spear_ehci), |
| 65 | |
| 66 | /* generic hardware linkage */ |
| 67 | .irq = ehci_irq, |
| 68 | .flags = HCD_MEMORY | HCD_USB2, |
| 69 | |
| 70 | /* basic lifecycle operations */ |
| 71 | .reset = ehci_spear_setup, |
| 72 | .start = ehci_run, |
| 73 | .stop = ehci_stop, |
| 74 | .shutdown = ehci_shutdown, |
| 75 | |
| 76 | /* managing i/o requests and associated device resources */ |
| 77 | .urb_enqueue = ehci_urb_enqueue, |
| 78 | .urb_dequeue = ehci_urb_dequeue, |
| 79 | .endpoint_disable = ehci_endpoint_disable, |
| 80 | .endpoint_reset = ehci_endpoint_reset, |
| 81 | |
| 82 | /* scheduling support */ |
| 83 | .get_frame_number = ehci_get_frame, |
| 84 | |
| 85 | /* root hub support */ |
| 86 | .hub_status_data = ehci_hub_status_data, |
| 87 | .hub_control = ehci_hub_control, |
| 88 | .bus_suspend = ehci_bus_suspend, |
| 89 | .bus_resume = ehci_bus_resume, |
| 90 | .relinquish_port = ehci_relinquish_port, |
| 91 | .port_handed_over = ehci_port_handed_over, |
| 92 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, |
| 93 | }; |
| 94 | |
Deepak Sikri | 8c1b369 | 2012-02-24 14:49:31 +0530 | [diff] [blame^] | 95 | #ifdef CONFIG_PM |
| 96 | static int ehci_spear_drv_suspend(struct device *dev) |
| 97 | { |
| 98 | struct usb_hcd *hcd = dev_get_drvdata(dev); |
| 99 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
| 100 | unsigned long flags; |
| 101 | int rc = 0; |
| 102 | |
| 103 | if (time_before(jiffies, ehci->next_statechange)) |
| 104 | msleep(10); |
| 105 | |
| 106 | /* |
| 107 | * Root hub was already suspended. Disable irq emission and mark HW |
| 108 | * unaccessible. The PM and USB cores make sure that the root hub is |
| 109 | * either suspended or stopped. |
| 110 | */ |
| 111 | spin_lock_irqsave(&ehci->lock, flags); |
| 112 | ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev)); |
| 113 | ehci_writel(ehci, 0, &ehci->regs->intr_enable); |
| 114 | ehci_readl(ehci, &ehci->regs->intr_enable); |
| 115 | spin_unlock_irqrestore(&ehci->lock, flags); |
| 116 | |
| 117 | return rc; |
| 118 | } |
| 119 | |
| 120 | static int ehci_spear_drv_resume(struct device *dev) |
| 121 | { |
| 122 | struct usb_hcd *hcd = dev_get_drvdata(dev); |
| 123 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
| 124 | |
| 125 | if (time_before(jiffies, ehci->next_statechange)) |
| 126 | msleep(100); |
| 127 | |
| 128 | if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) { |
| 129 | int mask = INTR_MASK; |
| 130 | |
| 131 | ehci_prepare_ports_for_controller_resume(ehci); |
| 132 | |
| 133 | if (!hcd->self.root_hub->do_remote_wakeup) |
| 134 | mask &= ~STS_PCD; |
| 135 | |
| 136 | ehci_writel(ehci, mask, &ehci->regs->intr_enable); |
| 137 | ehci_readl(ehci, &ehci->regs->intr_enable); |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | usb_root_hub_lost_power(hcd->self.root_hub); |
| 142 | |
| 143 | /* |
| 144 | * Else reset, to cope with power loss or flush-to-storage style |
| 145 | * "resume" having let BIOS kick in during reboot. |
| 146 | */ |
| 147 | ehci_halt(ehci); |
| 148 | ehci_reset(ehci); |
| 149 | |
| 150 | /* emptying the schedule aborts any urbs */ |
| 151 | spin_lock_irq(&ehci->lock); |
| 152 | if (ehci->reclaim) |
| 153 | end_unlink_async(ehci); |
| 154 | |
| 155 | ehci_work(ehci); |
| 156 | spin_unlock_irq(&ehci->lock); |
| 157 | |
| 158 | ehci_writel(ehci, ehci->command, &ehci->regs->command); |
| 159 | ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag); |
| 160 | ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */ |
| 161 | |
| 162 | /* here we "know" root ports should always stay powered */ |
| 163 | ehci_port_power(ehci, 1); |
| 164 | return 0; |
| 165 | } |
| 166 | #endif /* CONFIG_PM */ |
| 167 | |
| 168 | static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend, |
| 169 | ehci_spear_drv_resume); |
| 170 | |
Deepak Sikri | c8c38de | 2010-11-10 14:33:18 +0530 | [diff] [blame] | 171 | static int spear_ehci_hcd_drv_probe(struct platform_device *pdev) |
| 172 | { |
| 173 | struct usb_hcd *hcd ; |
| 174 | struct spear_ehci *ehci; |
| 175 | struct resource *res; |
| 176 | struct clk *usbh_clk; |
| 177 | const struct hc_driver *driver = &ehci_spear_hc_driver; |
| 178 | int *pdata = pdev->dev.platform_data; |
| 179 | int irq, retval; |
| 180 | char clk_name[20] = "usbh_clk"; |
| 181 | |
| 182 | if (pdata == NULL) |
| 183 | return -EFAULT; |
| 184 | |
| 185 | if (usb_disabled()) |
| 186 | return -ENODEV; |
| 187 | |
| 188 | irq = platform_get_irq(pdev, 0); |
| 189 | if (irq < 0) { |
| 190 | retval = irq; |
| 191 | goto fail_irq_get; |
| 192 | } |
| 193 | |
| 194 | if (*pdata >= 0) |
| 195 | sprintf(clk_name, "usbh.%01d_clk", *pdata); |
| 196 | |
| 197 | usbh_clk = clk_get(NULL, clk_name); |
| 198 | if (IS_ERR(usbh_clk)) { |
| 199 | dev_err(&pdev->dev, "Error getting interface clock\n"); |
| 200 | retval = PTR_ERR(usbh_clk); |
| 201 | goto fail_get_usbh_clk; |
| 202 | } |
| 203 | |
| 204 | hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); |
| 205 | if (!hcd) { |
| 206 | retval = -ENOMEM; |
| 207 | goto fail_create_hcd; |
| 208 | } |
| 209 | |
| 210 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 211 | if (!res) { |
| 212 | retval = -ENODEV; |
| 213 | goto fail_request_resource; |
| 214 | } |
| 215 | |
| 216 | hcd->rsrc_start = res->start; |
| 217 | hcd->rsrc_len = resource_size(res); |
| 218 | if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, |
| 219 | driver->description)) { |
| 220 | retval = -EBUSY; |
| 221 | goto fail_request_resource; |
| 222 | } |
| 223 | |
| 224 | hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); |
| 225 | if (hcd->regs == NULL) { |
| 226 | dev_dbg(&pdev->dev, "error mapping memory\n"); |
| 227 | retval = -ENOMEM; |
| 228 | goto fail_ioremap; |
| 229 | } |
| 230 | |
| 231 | ehci = (struct spear_ehci *)hcd_to_ehci(hcd); |
| 232 | ehci->clk = usbh_clk; |
| 233 | |
| 234 | spear_start_ehci(ehci); |
Yong Zhang | b5dd18d | 2011-09-07 16:10:52 +0800 | [diff] [blame] | 235 | retval = usb_add_hcd(hcd, irq, IRQF_SHARED); |
Deepak Sikri | c8c38de | 2010-11-10 14:33:18 +0530 | [diff] [blame] | 236 | if (retval) |
| 237 | goto fail_add_hcd; |
| 238 | |
| 239 | return retval; |
| 240 | |
| 241 | fail_add_hcd: |
| 242 | spear_stop_ehci(ehci); |
| 243 | iounmap(hcd->regs); |
| 244 | fail_ioremap: |
| 245 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); |
| 246 | fail_request_resource: |
| 247 | usb_put_hcd(hcd); |
| 248 | fail_create_hcd: |
| 249 | clk_put(usbh_clk); |
| 250 | fail_get_usbh_clk: |
| 251 | fail_irq_get: |
| 252 | dev_err(&pdev->dev, "init fail, %d\n", retval); |
| 253 | |
| 254 | return retval ; |
| 255 | } |
| 256 | |
| 257 | static int spear_ehci_hcd_drv_remove(struct platform_device *pdev) |
| 258 | { |
| 259 | struct usb_hcd *hcd = platform_get_drvdata(pdev); |
| 260 | struct spear_ehci *ehci_p = to_spear_ehci(hcd); |
| 261 | |
| 262 | if (!hcd) |
| 263 | return 0; |
| 264 | if (in_interrupt()) |
| 265 | BUG(); |
| 266 | usb_remove_hcd(hcd); |
| 267 | |
| 268 | if (ehci_p->clk) |
| 269 | spear_stop_ehci(ehci_p); |
| 270 | iounmap(hcd->regs); |
| 271 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); |
| 272 | usb_put_hcd(hcd); |
| 273 | |
| 274 | if (ehci_p->clk) |
| 275 | clk_put(ehci_p->clk); |
| 276 | |
| 277 | return 0; |
| 278 | } |
| 279 | |
| 280 | static struct platform_driver spear_ehci_hcd_driver = { |
| 281 | .probe = spear_ehci_hcd_drv_probe, |
| 282 | .remove = spear_ehci_hcd_drv_remove, |
| 283 | .shutdown = usb_hcd_platform_shutdown, |
| 284 | .driver = { |
| 285 | .name = "spear-ehci", |
Deepak Sikri | 8c1b369 | 2012-02-24 14:49:31 +0530 | [diff] [blame^] | 286 | .bus = &platform_bus_type, |
| 287 | .pm = &ehci_spear_pm_ops, |
Deepak Sikri | c8c38de | 2010-11-10 14:33:18 +0530 | [diff] [blame] | 288 | } |
| 289 | }; |
| 290 | |
| 291 | MODULE_ALIAS("platform:spear-ehci"); |