| 1 | From 0f91c21de577d2d9f1fd164ca686d9a4ff0e2c8b Mon Sep 17 00:00:00 2001 |
| 2 | From: Hauke Mehrtens <hauke@hauke-m.de> |
| 3 | Date: Sat, 26 Nov 2011 21:35:17 +0100 |
| 4 | Subject: [PATCH 20/26] USB: Add driver for the ssb bus |
| 5 | |
| 6 | This adds a USB driver using the generic platform device driver for the |
| 7 | USB controller found on the Broadcom ssb bus. The ssb bus just |
| 8 | exposes one device which serves the OHCI and the EHCI controller at the |
| 9 | same time. This driver probes for this USB controller and creates and |
| 10 | registers two new platform devices which will be probed by the new |
| 11 | generic platform device driver. This makes it possible to use the EHCI |
| 12 | and the OCHI controller on the ssb bus at the same time. |
| 13 | |
| 14 | The old ssb OHCI USB driver will be removed in the next step as this |
| 15 | driver also provide an OHCI driver and an EHCI for the cores supporting |
| 16 | it. |
| 17 | |
| 18 | Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> |
| 19 | --- |
| 20 | drivers/usb/host/Kconfig | 12 ++ |
| 21 | drivers/usb/host/Makefile | 1 + |
| 22 | drivers/usb/host/ssb-hcd.c | 272 ++++++++++++++++++++++++++++++++++++++++++++ |
| 23 | 3 files changed, 285 insertions(+), 0 deletions(-) |
| 24 | create mode 100644 drivers/usb/host/ssb-hcd.c |
| 25 | |
| 26 | --- a/drivers/usb/host/Kconfig |
| 27 | +++ b/drivers/usb/host/Kconfig |
| 28 | @@ -610,3 +610,15 @@ config USB_HCD_BCMA |
| 29 | for ehci and ohci. |
| 30 | |
| 31 | If unsure, say N. |
| 32 | + |
| 33 | +config USB_HCD_SSB |
| 34 | + tristate "SSB usb host driver" |
| 35 | + depends on SSB && EXPERIMENTAL |
| 36 | + select USB_OHCI_HCD_PLATFORM if USB_OHCI_HCD |
| 37 | + select USB_EHCI_HCD_PLATFORM if USB_EHCI_HCD |
| 38 | + help |
| 39 | + Enbale support for the EHCI and OCHI host controller on an bcma bus. |
| 40 | + It converts the bcma driver into two platform device drivers |
| 41 | + for ehci and ohci. |
| 42 | + |
| 43 | + If unsure, say N. |
| 44 | --- a/drivers/usb/host/Makefile |
| 45 | +++ b/drivers/usb/host/Makefile |
| 46 | @@ -36,3 +36,4 @@ obj-$(CONFIG_USB_IMX21_HCD) += imx21-hcd |
| 47 | obj-$(CONFIG_USB_FSL_MPH_DR_OF) += fsl-mph-dr-of.o |
| 48 | obj-$(CONFIG_USB_OCTEON2_COMMON) += octeon2-common.o |
| 49 | obj-$(CONFIG_USB_HCD_BCMA) += bcma-hcd.o |
| 50 | +obj-$(CONFIG_USB_HCD_SSB) += ssb-hcd.o |
| 51 | --- /dev/null |
| 52 | +++ b/drivers/usb/host/ssb-hcd.c |
| 53 | @@ -0,0 +1,272 @@ |
| 54 | +/* |
| 55 | + * Sonics Silicon Backplane |
| 56 | + * Broadcom USB-core driver (SSB bus glue) |
| 57 | + * |
| 58 | + * Copyright 2011 Hauke Mehrtens <hauke@hauke-m.de> |
| 59 | + * |
| 60 | + * Based on ssb-ohci driver |
| 61 | + * Copyright 2007 Michael Buesch <m@bues.ch> |
| 62 | + * |
| 63 | + * Derived from the OHCI-PCI driver |
| 64 | + * Copyright 1999 Roman Weissgaerber |
| 65 | + * Copyright 2000-2002 David Brownell |
| 66 | + * Copyright 1999 Linus Torvalds |
| 67 | + * Copyright 1999 Gregory P. Smith |
| 68 | + * |
| 69 | + * Derived from the USBcore related parts of Broadcom-SB |
| 70 | + * Copyright 2005-2011 Broadcom Corporation |
| 71 | + * |
| 72 | + * Licensed under the GNU/GPL. See COPYING for details. |
| 73 | + */ |
| 74 | +#include <linux/ssb/ssb.h> |
| 75 | +#include <linux/delay.h> |
| 76 | +#include <linux/platform_device.h> |
| 77 | +#include <linux/module.h> |
| 78 | + |
| 79 | +MODULE_AUTHOR("Hauke Mehrtens"); |
| 80 | +MODULE_DESCRIPTION("Common USB driver for SSB Bus"); |
| 81 | +MODULE_LICENSE("GPL"); |
| 82 | + |
| 83 | +#define SSB_HCD_TMSLOW_HOSTMODE (1 << 29) |
| 84 | + |
| 85 | +struct ssb_hcd_device { |
| 86 | + struct platform_device *ehci_dev; |
| 87 | + struct platform_device *ohci_dev; |
| 88 | + |
| 89 | + u32 enable_flags; |
| 90 | +}; |
| 91 | + |
| 92 | +static void __devinit ssb_hcd_5354wa(struct ssb_device *dev) |
| 93 | +{ |
| 94 | +#ifdef CONFIG_SSB_DRIVER_MIPS |
| 95 | + /* Work around for 5354 failures */ |
| 96 | + if (dev->id.revision == 2 && dev->bus->chip_id == 0x5354) { |
| 97 | + /* Change syn01 reg */ |
| 98 | + ssb_write32(dev, 0x894, 0x00fe00fe); |
| 99 | + |
| 100 | + /* Change syn03 reg */ |
| 101 | + ssb_write32(dev, 0x89c, ssb_read32(dev, 0x89c) | 0x1); |
| 102 | + } |
| 103 | +#endif |
| 104 | +} |
| 105 | + |
| 106 | +static void __devinit ssb_hcd_usb20wa(struct ssb_device *dev) |
| 107 | +{ |
| 108 | + if (dev->id.coreid == SSB_DEV_USB20_HOST) { |
| 109 | + /* |
| 110 | + * USB 2.0 special considerations: |
| 111 | + * |
| 112 | + * In addition to the standard SSB reset sequence, the Host |
| 113 | + * Control Register must be programmed to bring the USB core |
| 114 | + * and various phy components out of reset. |
| 115 | + */ |
| 116 | + ssb_write32(dev, 0x200, 0x7ff); |
| 117 | + |
| 118 | + /* Change Flush control reg */ |
| 119 | + ssb_write32(dev, 0x400, ssb_read32(dev, 0x400) & ~8); |
| 120 | + ssb_read32(dev, 0x400); |
| 121 | + |
| 122 | + /* Change Shim control reg */ |
| 123 | + ssb_write32(dev, 0x304, ssb_read32(dev, 0x304) & ~0x100); |
| 124 | + ssb_read32(dev, 0x304); |
| 125 | + |
| 126 | + udelay(1); |
| 127 | + |
| 128 | + ssb_hcd_5354wa(dev); |
| 129 | + } |
| 130 | +} |
| 131 | + |
| 132 | +/* based on arch/mips/brcm-boards/bcm947xx/pcibios.c */ |
| 133 | +static u32 __devinit ssb_hcd_init_chip(struct ssb_device *dev) |
| 134 | +{ |
| 135 | + u32 flags = 0; |
| 136 | + |
| 137 | + if (dev->id.coreid == SSB_DEV_USB11_HOSTDEV) |
| 138 | + /* Put the device into host-mode. */ |
| 139 | + flags |= SSB_HCD_TMSLOW_HOSTMODE; |
| 140 | + |
| 141 | + ssb_device_enable(dev, flags); |
| 142 | + |
| 143 | + ssb_hcd_usb20wa(dev); |
| 144 | + |
| 145 | + return flags; |
| 146 | +} |
| 147 | + |
| 148 | +static struct platform_device * __devinit |
| 149 | +ssb_hcd_create_pdev(struct ssb_device *dev, char *name, u32 addr, u32 len) |
| 150 | +{ |
| 151 | + struct platform_device *hci_dev; |
| 152 | + struct resource hci_res[2]; |
| 153 | + int ret = -ENOMEM; |
| 154 | + |
| 155 | + memset(hci_res, 0, sizeof(hci_res)); |
| 156 | + |
| 157 | + hci_res[0].start = addr; |
| 158 | + hci_res[0].end = hci_res[0].start + len - 1; |
| 159 | + hci_res[0].flags = IORESOURCE_MEM; |
| 160 | + |
| 161 | + hci_res[1].start = dev->irq; |
| 162 | + hci_res[1].flags = IORESOURCE_IRQ; |
| 163 | + |
| 164 | + hci_dev = platform_device_alloc(name, 0); |
| 165 | + if (!hci_dev) |
| 166 | + goto err_alloc; |
| 167 | + |
| 168 | + hci_dev->dev.parent = dev->dev; |
| 169 | + hci_dev->dev.dma_mask = &hci_dev->dev.coherent_dma_mask; |
| 170 | + |
| 171 | + ret = platform_device_add_resources(hci_dev, hci_res, 2); |
| 172 | + if (ret) |
| 173 | + goto err_alloc; |
| 174 | + |
| 175 | + ret = platform_device_add(hci_dev); |
| 176 | + if (ret) { |
| 177 | +err_alloc: |
| 178 | + platform_device_put(hci_dev); |
| 179 | + return ERR_PTR(ret); |
| 180 | + } |
| 181 | + |
| 182 | + return hci_dev; |
| 183 | +} |
| 184 | + |
| 185 | +static int __devinit ssb_hcd_probe(struct ssb_device *dev, |
| 186 | + const struct ssb_device_id *id) |
| 187 | +{ |
| 188 | + int err, tmp; |
| 189 | + int start, len; |
| 190 | + u16 chipid_top; |
| 191 | + struct ssb_hcd_device *usb_dev; |
| 192 | + |
| 193 | + /* USBcores are only connected on embedded devices. */ |
| 194 | + chipid_top = (dev->bus->chip_id & 0xFF00); |
| 195 | + if (chipid_top != 0x4700 && chipid_top != 0x5300) |
| 196 | + return -ENODEV; |
| 197 | + |
| 198 | + /* TODO: Probably need checks here; is the core connected? */ |
| 199 | + |
| 200 | + if (dma_set_mask(dev->dma_dev, DMA_BIT_MASK(32)) || |
| 201 | + dma_set_coherent_mask(dev->dma_dev, DMA_BIT_MASK(32))) |
| 202 | + return -EOPNOTSUPP; |
| 203 | + |
| 204 | + usb_dev = kzalloc(sizeof(struct ssb_hcd_device), GFP_KERNEL); |
| 205 | + if (!usb_dev) |
| 206 | + return -ENOMEM; |
| 207 | + |
| 208 | + /* We currently always attach SSB_DEV_USB11_HOSTDEV |
| 209 | + * as HOST OHCI. If we want to attach it as Client device, |
| 210 | + * we must branch here and call into the (yet to |
| 211 | + * be written) Client mode driver. Same for remove(). */ |
| 212 | + usb_dev->enable_flags = ssb_hcd_init_chip(dev); |
| 213 | + |
| 214 | + tmp = ssb_read32(dev, SSB_ADMATCH0); |
| 215 | + |
| 216 | + start = ssb_admatch_base(tmp); |
| 217 | + len = ssb_admatch_size(tmp); |
| 218 | + usb_dev->ohci_dev = ssb_hcd_create_pdev(dev, "ohci-platform", start, |
| 219 | + len); |
| 220 | + if (IS_ERR(usb_dev->ohci_dev)) { |
| 221 | + err = PTR_ERR(usb_dev->ohci_dev); |
| 222 | + goto err_free_usb_dev; |
| 223 | + } |
| 224 | + |
| 225 | + if (dev->id.coreid == SSB_DEV_USB20_HOST) { |
| 226 | + start = ssb_admatch_base(tmp) + 0x800; /* ehci core offset */ |
| 227 | + len = 0x100; /* ehci reg block size */ |
| 228 | + usb_dev->ehci_dev = ssb_hcd_create_pdev(dev, "ehci-platform", |
| 229 | + start, len); |
| 230 | + if (IS_ERR(usb_dev->ehci_dev)) { |
| 231 | + err = PTR_ERR(usb_dev->ehci_dev); |
| 232 | + goto err_unregister_ohci_dev; |
| 233 | + } |
| 234 | + } |
| 235 | + |
| 236 | + ssb_set_drvdata(dev, usb_dev); |
| 237 | + return 0; |
| 238 | + |
| 239 | +err_unregister_ohci_dev: |
| 240 | + platform_device_unregister(usb_dev->ohci_dev); |
| 241 | +err_free_usb_dev: |
| 242 | + kfree(usb_dev); |
| 243 | + return err; |
| 244 | +} |
| 245 | + |
| 246 | +static void __devexit ssb_hcd_remove(struct ssb_device *dev) |
| 247 | +{ |
| 248 | + struct ssb_hcd_device *usb_dev; |
| 249 | + struct platform_device *ohci_dev; |
| 250 | + struct platform_device *ehci_dev; |
| 251 | + |
| 252 | + usb_dev = ssb_get_drvdata(dev); |
| 253 | + if (!usb_dev) |
| 254 | + return; |
| 255 | + |
| 256 | + ohci_dev = usb_dev->ohci_dev; |
| 257 | + ehci_dev = usb_dev->ehci_dev; |
| 258 | + |
| 259 | + if (ohci_dev) { |
| 260 | + platform_device_unregister(ohci_dev); |
| 261 | + } |
| 262 | + if (ehci_dev) { |
| 263 | + platform_device_unregister(ehci_dev); |
| 264 | + } |
| 265 | + |
| 266 | + ssb_device_disable(dev, 0); |
| 267 | +} |
| 268 | + |
| 269 | +static void __devexit ssb_hcd_shutdown(struct ssb_device *dev) |
| 270 | +{ |
| 271 | + ssb_device_disable(dev, 0); |
| 272 | +} |
| 273 | + |
| 274 | +#ifdef CONFIG_PM |
| 275 | + |
| 276 | +static int ssb_hcd_suspend(struct ssb_device *dev, pm_message_t state) |
| 277 | +{ |
| 278 | + ssb_device_disable(dev, 0); |
| 279 | + |
| 280 | + return 0; |
| 281 | +} |
| 282 | + |
| 283 | +static int ssb_hcd_resume(struct ssb_device *dev) |
| 284 | +{ |
| 285 | + struct ssb_hcd_device *usb_dev = ssb_get_drvdata(dev); |
| 286 | + |
| 287 | + ssb_device_enable(dev, usb_dev->enable_flags); |
| 288 | + |
| 289 | + return 0; |
| 290 | +} |
| 291 | + |
| 292 | +#else /* !CONFIG_PM */ |
| 293 | +#define ssb_hcd_suspend NULL |
| 294 | +#define ssb_hcd_resume NULL |
| 295 | +#endif /* CONFIG_PM */ |
| 296 | + |
| 297 | +static const struct ssb_device_id ssb_hcd_table[] __devinitconst = { |
| 298 | + SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOSTDEV, SSB_ANY_REV), |
| 299 | + SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOST, SSB_ANY_REV), |
| 300 | + SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB20_HOST, SSB_ANY_REV), |
| 301 | + SSB_DEVTABLE_END |
| 302 | +}; |
| 303 | +MODULE_DEVICE_TABLE(ssb, ssb_hcd_table); |
| 304 | + |
| 305 | +static struct ssb_driver ssb_hcd_driver = { |
| 306 | + .name = KBUILD_MODNAME, |
| 307 | + .id_table = ssb_hcd_table, |
| 308 | + .probe = ssb_hcd_probe, |
| 309 | + .remove = __devexit_p(ssb_hcd_remove), |
| 310 | + .shutdown = ssb_hcd_shutdown, |
| 311 | + .suspend = ssb_hcd_suspend, |
| 312 | + .resume = ssb_hcd_resume, |
| 313 | +}; |
| 314 | + |
| 315 | +static int __init ssb_hcd_init(void) |
| 316 | +{ |
| 317 | + return ssb_driver_register(&ssb_hcd_driver); |
| 318 | +} |
| 319 | +module_init(ssb_hcd_init); |
| 320 | + |
| 321 | +static void __exit ssb_hcd_exit(void) |
| 322 | +{ |
| 323 | + ssb_driver_unregister(&ssb_hcd_driver); |
| 324 | +} |
| 325 | +module_exit(ssb_hcd_exit); |
| 326 | |
