| 1 | From 70fc4b2a6200ef7a1b99a6aa28234b919f23b43c Mon Sep 17 00:00:00 2001 |
| 2 | From: Hauke Mehrtens <hauke@hauke-m.de> |
| 3 | Date: Sat, 26 Nov 2011 21:33:41 +0100 |
| 4 | Subject: [PATCH 184/186] USB: Add driver for the bcma bus |
| 5 | |
| 6 | This adds a USB driver using the generic platform device driver for the |
| 7 | USB controller found on the Broadcom bcma bus. The bcma 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 bcma bus at the same time. |
| 13 | |
| 14 | Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> |
| 15 | --- |
| 16 | drivers/usb/host/Kconfig | 12 ++ |
| 17 | drivers/usb/host/Makefile | 1 + |
| 18 | drivers/usb/host/bcma-hcd.c | 328 +++++++++++++++++++++++++++++++++++++++++++ |
| 19 | 3 files changed, 341 insertions(+), 0 deletions(-) |
| 20 | create mode 100644 drivers/usb/host/bcma-hcd.c |
| 21 | |
| 22 | --- a/drivers/usb/host/Kconfig |
| 23 | +++ b/drivers/usb/host/Kconfig |
| 24 | @@ -618,3 +618,15 @@ config USB_PXA168_EHCI |
| 25 | help |
| 26 | Enable support for Marvell PXA168 SoC's on-chip EHCI |
| 27 | host controller |
| 28 | + |
| 29 | +config USB_HCD_BCMA |
| 30 | + tristate "BCMA usb host driver" |
| 31 | + depends on BCMA && EXPERIMENTAL |
| 32 | + select USB_OHCI_HCD_PLATFORM if USB_OHCI_HCD |
| 33 | + select USB_EHCI_HCD_PLATFORM if USB_EHCI_HCD |
| 34 | + help |
| 35 | + Enbale support for the EHCI and OCHI host controller on an bcma bus. |
| 36 | + It converts the bcma driver into two platform device drivers |
| 37 | + for ehci and ohci. |
| 38 | + |
| 39 | + If unsure, say N. |
| 40 | --- a/drivers/usb/host/Makefile |
| 41 | +++ b/drivers/usb/host/Makefile |
| 42 | @@ -37,3 +37,4 @@ obj-$(CONFIG_USB_IMX21_HCD) += imx21-hcd |
| 43 | obj-$(CONFIG_USB_FSL_MPH_DR_OF) += fsl-mph-dr-of.o |
| 44 | obj-$(CONFIG_USB_OCTEON2_COMMON) += octeon2-common.o |
| 45 | obj-$(CONFIG_MIPS_ALCHEMY) += alchemy-common.o |
| 46 | +obj-$(CONFIG_USB_HCD_BCMA) += bcma-hcd.o |
| 47 | --- /dev/null |
| 48 | +++ b/drivers/usb/host/bcma-hcd.c |
| 49 | @@ -0,0 +1,328 @@ |
| 50 | +/* |
| 51 | + * Broadcom specific Advanced Microcontroller Bus |
| 52 | + * Broadcom USB-core driver (BCMA bus glue) |
| 53 | + * |
| 54 | + * Copyright 2011 Hauke Mehrtens <hauke@hauke-m.de> |
| 55 | + * |
| 56 | + * Based on ssb-ohci driver |
| 57 | + * Copyright 2007 Michael Buesch <m@bues.ch> |
| 58 | + * |
| 59 | + * Derived from the OHCI-PCI driver |
| 60 | + * Copyright 1999 Roman Weissgaerber |
| 61 | + * Copyright 2000-2002 David Brownell |
| 62 | + * Copyright 1999 Linus Torvalds |
| 63 | + * Copyright 1999 Gregory P. Smith |
| 64 | + * |
| 65 | + * Derived from the USBcore related parts of Broadcom-SB |
| 66 | + * Copyright 2005-2011 Broadcom Corporation |
| 67 | + * |
| 68 | + * Licensed under the GNU/GPL. See COPYING for details. |
| 69 | + */ |
| 70 | +#include <linux/bcma/bcma.h> |
| 71 | +#include <linux/delay.h> |
| 72 | +#include <linux/platform_device.h> |
| 73 | +#include <linux/module.h> |
| 74 | +#include <linux/usb/hci_driver.h> |
| 75 | + |
| 76 | +MODULE_AUTHOR("Hauke Mehrtens"); |
| 77 | +MODULE_DESCRIPTION("Common USB driver for BCMA Bus"); |
| 78 | +MODULE_LICENSE("GPL"); |
| 79 | + |
| 80 | +struct bcma_hcd_device { |
| 81 | + struct platform_device *ehci_dev; |
| 82 | + struct platform_device *ohci_dev; |
| 83 | +}; |
| 84 | + |
| 85 | +/* Wait for bitmask in a register to get set or cleared. |
| 86 | + * timeout is in units of ten-microseconds. |
| 87 | + */ |
| 88 | +static int bcma_wait_bits(struct bcma_device *dev, u16 reg, u32 bitmask, |
| 89 | + int timeout) |
| 90 | +{ |
| 91 | + int i; |
| 92 | + u32 val; |
| 93 | + |
| 94 | + for (i = 0; i < timeout; i++) { |
| 95 | + val = bcma_read32(dev, reg); |
| 96 | + if ((val & bitmask) == bitmask) |
| 97 | + return 0; |
| 98 | + udelay(10); |
| 99 | + } |
| 100 | + |
| 101 | + return -ETIMEDOUT; |
| 102 | +} |
| 103 | + |
| 104 | +static void __devinit bcma_hcd_4716wa(struct bcma_device *dev) |
| 105 | +{ |
| 106 | +#ifdef CONFIG_BCMA_DRIVER_MIPS |
| 107 | + /* Work around for 4716 failures. */ |
| 108 | + if (dev->bus->chipinfo.id == 0x4716) { |
| 109 | + u32 tmp; |
| 110 | + |
| 111 | + tmp = bcma_cpu_clock(&dev->bus->drv_mips); |
| 112 | + if (tmp >= 480000000) |
| 113 | + tmp = 0x1846b; /* set CDR to 0x11(fast) */ |
| 114 | + else if (tmp == 453000000) |
| 115 | + tmp = 0x1046b; /* set CDR to 0x10(slow) */ |
| 116 | + else |
| 117 | + tmp = 0; |
| 118 | + |
| 119 | + /* Change Shim mdio control reg to fix host not acking at |
| 120 | + * high frequencies |
| 121 | + */ |
| 122 | + if (tmp) { |
| 123 | + bcma_write32(dev, 0x524, 0x1); /* write sel to enable */ |
| 124 | + udelay(500); |
| 125 | + |
| 126 | + bcma_write32(dev, 0x524, tmp); |
| 127 | + udelay(500); |
| 128 | + bcma_write32(dev, 0x524, 0x4ab); |
| 129 | + udelay(500); |
| 130 | + bcma_read32(dev, 0x528); |
| 131 | + bcma_write32(dev, 0x528, 0x80000000); |
| 132 | + } |
| 133 | + } |
| 134 | +#endif /* CONFIG_BCMA_DRIVER_MIPS */ |
| 135 | +} |
| 136 | + |
| 137 | +/* based on arch/mips/brcm-boards/bcm947xx/pcibios.c */ |
| 138 | +static void __devinit bcma_hcd_init_chip(struct bcma_device *dev) |
| 139 | +{ |
| 140 | + u32 tmp; |
| 141 | + |
| 142 | + /* |
| 143 | + * USB 2.0 special considerations: |
| 144 | + * |
| 145 | + * 1. Since the core supports both OHCI and EHCI functions, it must |
| 146 | + * only be reset once. |
| 147 | + * |
| 148 | + * 2. In addition to the standard SI reset sequence, the Host Control |
| 149 | + * Register must be programmed to bring the USB core and various |
| 150 | + * phy components out of reset. |
| 151 | + */ |
| 152 | + if (!bcma_core_is_enabled(dev)) { |
| 153 | + bcma_core_enable(dev, 0); |
| 154 | + mdelay(10); |
| 155 | + if (dev->id.rev >= 5) { |
| 156 | + /* Enable Misc PLL */ |
| 157 | + tmp = bcma_read32(dev, 0x1e0); |
| 158 | + tmp |= 0x100; |
| 159 | + bcma_write32(dev, 0x1e0, tmp); |
| 160 | + if (bcma_wait_bits(dev, 0x1e0, 1 << 24, 100)) |
| 161 | + printk(KERN_EMERG "Failed to enable misc PPL!\n"); |
| 162 | + |
| 163 | + /* Take out of resets */ |
| 164 | + bcma_write32(dev, 0x200, 0x4ff); |
| 165 | + udelay(25); |
| 166 | + bcma_write32(dev, 0x200, 0x6ff); |
| 167 | + udelay(25); |
| 168 | + |
| 169 | + /* Make sure digital and AFE are locked in USB PHY */ |
| 170 | + bcma_write32(dev, 0x524, 0x6b); |
| 171 | + udelay(50); |
| 172 | + tmp = bcma_read32(dev, 0x524); |
| 173 | + udelay(50); |
| 174 | + bcma_write32(dev, 0x524, 0xab); |
| 175 | + udelay(50); |
| 176 | + tmp = bcma_read32(dev, 0x524); |
| 177 | + udelay(50); |
| 178 | + bcma_write32(dev, 0x524, 0x2b); |
| 179 | + udelay(50); |
| 180 | + tmp = bcma_read32(dev, 0x524); |
| 181 | + udelay(50); |
| 182 | + bcma_write32(dev, 0x524, 0x10ab); |
| 183 | + udelay(50); |
| 184 | + tmp = bcma_read32(dev, 0x524); |
| 185 | + |
| 186 | + if (bcma_wait_bits(dev, 0x528, 0xc000, 10000)) { |
| 187 | + tmp = bcma_read32(dev, 0x528); |
| 188 | + printk(KERN_EMERG |
| 189 | + "USB20H mdio_rddata 0x%08x\n", tmp); |
| 190 | + } |
| 191 | + bcma_write32(dev, 0x528, 0x80000000); |
| 192 | + tmp = bcma_read32(dev, 0x314); |
| 193 | + udelay(265); |
| 194 | + bcma_write32(dev, 0x200, 0x7ff); |
| 195 | + udelay(10); |
| 196 | + |
| 197 | + /* Take USB and HSIC out of non-driving modes */ |
| 198 | + bcma_write32(dev, 0x510, 0); |
| 199 | + } else { |
| 200 | + bcma_write32(dev, 0x200, 0x7ff); |
| 201 | + |
| 202 | + udelay(1); |
| 203 | + } |
| 204 | + |
| 205 | + bcma_hcd_4716wa(dev); |
| 206 | + } |
| 207 | +} |
| 208 | + |
| 209 | +static const struct usb_hci_pdata p_data = { |
| 210 | + .flags = USB_HCI_PDATA_PORT_POWER_SET, |
| 211 | + .power_set_is_on = 1, |
| 212 | +}; |
| 213 | + |
| 214 | +static struct platform_device * __devinit |
| 215 | +bcma_hcd_create_pdev(struct bcma_device *dev, char *name, u32 addr) |
| 216 | +{ |
| 217 | + struct platform_device *hci_dev; |
| 218 | + struct resource hci_res[2]; |
| 219 | + int ret = -ENOMEM; |
| 220 | + |
| 221 | + memset(hci_res, 0, sizeof(hci_res)); |
| 222 | + |
| 223 | + hci_res[0].start = addr; |
| 224 | + hci_res[0].end = hci_res[0].start + 0x1000 - 1; |
| 225 | + hci_res[0].flags = IORESOURCE_MEM; |
| 226 | + |
| 227 | + hci_res[1].start = dev->irq; |
| 228 | + hci_res[1].flags = IORESOURCE_IRQ; |
| 229 | + |
| 230 | + hci_dev = platform_device_alloc(name, 0); |
| 231 | + if (!hci_dev) |
| 232 | + return NULL; |
| 233 | + |
| 234 | + hci_dev->dev.parent = &dev->dev; |
| 235 | + hci_dev->dev.dma_mask = &hci_dev->dev.coherent_dma_mask; |
| 236 | + |
| 237 | + ret = platform_device_add_resources(hci_dev, hci_res, |
| 238 | + ARRAY_SIZE(hci_res)); |
| 239 | + if (ret) |
| 240 | + goto err_alloc; |
| 241 | + ret = platform_device_add_data(hci_dev, &p_data, sizeof(p_data)); |
| 242 | + if (ret) |
| 243 | + goto err_alloc; |
| 244 | + ret = platform_device_add(hci_dev); |
| 245 | + if (ret) |
| 246 | + goto err_alloc; |
| 247 | + |
| 248 | + return hci_dev; |
| 249 | + |
| 250 | +err_alloc: |
| 251 | + platform_device_put(hci_dev); |
| 252 | + return ERR_PTR(ret); |
| 253 | +} |
| 254 | + |
| 255 | +static int __devinit bcma_hcd_probe(struct bcma_device *dev) |
| 256 | +{ |
| 257 | + int err; |
| 258 | + u16 chipid_top; |
| 259 | + u32 ohci_addr; |
| 260 | + struct bcma_hcd_device *usb_dev; |
| 261 | + struct bcma_chipinfo *chipinfo; |
| 262 | + |
| 263 | + chipinfo = &dev->bus->chipinfo; |
| 264 | + /* USBcores are only connected on embedded devices. */ |
| 265 | + chipid_top = (chipinfo->id & 0xFF00); |
| 266 | + if (chipid_top != 0x4700 && chipid_top != 0x5300) |
| 267 | + return -ENODEV; |
| 268 | + |
| 269 | + /* TODO: Probably need checks here; is the core connected? */ |
| 270 | + |
| 271 | + if (dma_set_mask(dev->dma_dev, DMA_BIT_MASK(32)) || |
| 272 | + dma_set_coherent_mask(dev->dma_dev, DMA_BIT_MASK(32))) |
| 273 | + return -EOPNOTSUPP; |
| 274 | + |
| 275 | + usb_dev = kzalloc(sizeof(struct bcma_hcd_device), GFP_KERNEL); |
| 276 | + if (!usb_dev) |
| 277 | + return -ENOMEM; |
| 278 | + |
| 279 | + bcma_hcd_init_chip(dev); |
| 280 | + |
| 281 | + /* In AI chips EHCI is addrspace 0, OHCI is 1 */ |
| 282 | + ohci_addr = dev->addr1; |
| 283 | + if ((chipinfo->id == 0x5357 || chipinfo->id == 0x4749) |
| 284 | + && chipinfo->rev == 0) |
| 285 | + ohci_addr = 0x18009000; |
| 286 | + |
| 287 | + usb_dev->ohci_dev = bcma_hcd_create_pdev(dev, "ohci-platform", |
| 288 | + ohci_addr); |
| 289 | + if (IS_ERR(usb_dev->ohci_dev)) { |
| 290 | + err = PTR_ERR(usb_dev->ohci_dev); |
| 291 | + goto err_free_usb_dev; |
| 292 | + } |
| 293 | + |
| 294 | + usb_dev->ehci_dev = bcma_hcd_create_pdev(dev, "ehci-platform", |
| 295 | + dev->addr); |
| 296 | + if (IS_ERR(usb_dev->ehci_dev)) { |
| 297 | + err = PTR_ERR(usb_dev->ehci_dev); |
| 298 | + goto err_unregister_ohci_dev; |
| 299 | + } |
| 300 | + |
| 301 | + bcma_set_drvdata(dev, usb_dev); |
| 302 | + return 0; |
| 303 | + |
| 304 | +err_unregister_ohci_dev: |
| 305 | + platform_device_unregister(usb_dev->ohci_dev); |
| 306 | +err_free_usb_dev: |
| 307 | + kfree(usb_dev); |
| 308 | + return err; |
| 309 | +} |
| 310 | + |
| 311 | +static void __devexit bcma_hcd_remove(struct bcma_device *dev) |
| 312 | +{ |
| 313 | + struct bcma_hcd_device *usb_dev = bcma_get_drvdata(dev); |
| 314 | + struct platform_device *ohci_dev = usb_dev->ohci_dev; |
| 315 | + struct platform_device *ehci_dev = usb_dev->ehci_dev; |
| 316 | + |
| 317 | + if (ohci_dev) |
| 318 | + platform_device_unregister(ohci_dev); |
| 319 | + if (ehci_dev) |
| 320 | + platform_device_unregister(ehci_dev); |
| 321 | + |
| 322 | + bcma_core_disable(dev, 0); |
| 323 | +} |
| 324 | + |
| 325 | +static void bcma_hcd_shutdown(struct bcma_device *dev) |
| 326 | +{ |
| 327 | + bcma_core_disable(dev, 0); |
| 328 | +} |
| 329 | + |
| 330 | +#ifdef CONFIG_PM |
| 331 | + |
| 332 | +static int bcma_hcd_suspend(struct bcma_device *dev, pm_message_t state) |
| 333 | +{ |
| 334 | + bcma_core_disable(dev, 0); |
| 335 | + |
| 336 | + return 0; |
| 337 | +} |
| 338 | + |
| 339 | +static int bcma_hcd_resume(struct bcma_device *dev) |
| 340 | +{ |
| 341 | + bcma_core_enable(dev, 0); |
| 342 | + |
| 343 | + return 0; |
| 344 | +} |
| 345 | + |
| 346 | +#else /* !CONFIG_PM */ |
| 347 | +#define bcma_hcd_suspend NULL |
| 348 | +#define bcma_hcd_resume NULL |
| 349 | +#endif /* CONFIG_PM */ |
| 350 | + |
| 351 | +static const struct bcma_device_id bcma_hcd_table[] __devinitconst = { |
| 352 | + BCMA_CORE(BCMA_MANUF_BCM, BCMA_CORE_USB20_HOST, BCMA_ANY_REV, BCMA_ANY_CLASS), |
| 353 | + BCMA_CORETABLE_END |
| 354 | +}; |
| 355 | +MODULE_DEVICE_TABLE(bcma, bcma_hcd_table); |
| 356 | + |
| 357 | +static struct bcma_driver bcma_hcd_driver = { |
| 358 | + .name = KBUILD_MODNAME, |
| 359 | + .id_table = bcma_hcd_table, |
| 360 | + .probe = bcma_hcd_probe, |
| 361 | + .remove = __devexit_p(bcma_hcd_remove), |
| 362 | + .shutdown = bcma_hcd_shutdown, |
| 363 | + .suspend = bcma_hcd_suspend, |
| 364 | + .resume = bcma_hcd_resume, |
| 365 | +}; |
| 366 | + |
| 367 | +static int __init bcma_hcd_init(void) |
| 368 | +{ |
| 369 | + return bcma_driver_register(&bcma_hcd_driver); |
| 370 | +} |
| 371 | +module_init(bcma_hcd_init); |
| 372 | + |
| 373 | +static void __exit bcma_hcd_exit(void) |
| 374 | +{ |
| 375 | + bcma_driver_unregister(&bcma_hcd_driver); |
| 376 | +} |
| 377 | +module_exit(bcma_hcd_exit); |
| 378 | |
