334 lines
7.8 KiB
C
334 lines
7.8 KiB
C
/*
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* Broadcom specific Advanced Microcontroller Bus
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* Broadcom USB-core driver (BCMA bus glue)
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*
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* Copyright 2011-2012 Hauke Mehrtens <hauke@hauke-m.de>
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*
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* Based on ssb-ohci driver
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* Copyright 2007 Michael Buesch <m@bues.ch>
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*
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* Derived from the OHCI-PCI driver
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* Copyright 1999 Roman Weissgaerber
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* Copyright 2000-2002 David Brownell
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* Copyright 1999 Linus Torvalds
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* Copyright 1999 Gregory P. Smith
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*
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* Derived from the USBcore related parts of Broadcom-SB
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* Copyright 2005-2011 Broadcom Corporation
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*
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* Licensed under the GNU/GPL. See COPYING for details.
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*/
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#include <linux/bcma/bcma.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/usb/ehci_pdriver.h>
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#include <linux/usb/ohci_pdriver.h>
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MODULE_AUTHOR("Hauke Mehrtens");
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MODULE_DESCRIPTION("Common USB driver for BCMA Bus");
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MODULE_LICENSE("GPL");
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struct bcma_hcd_device {
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struct platform_device *ehci_dev;
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struct platform_device *ohci_dev;
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};
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/* Wait for bitmask in a register to get set or cleared.
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* timeout is in units of ten-microseconds.
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*/
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static int bcma_wait_bits(struct bcma_device *dev, u16 reg, u32 bitmask,
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int timeout)
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{
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int i;
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u32 val;
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for (i = 0; i < timeout; i++) {
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val = bcma_read32(dev, reg);
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if ((val & bitmask) == bitmask)
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return 0;
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udelay(10);
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}
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return -ETIMEDOUT;
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}
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static void bcma_hcd_4716wa(struct bcma_device *dev)
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{
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#ifdef CONFIG_BCMA_DRIVER_MIPS
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/* Work around for 4716 failures. */
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if (dev->bus->chipinfo.id == 0x4716) {
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u32 tmp;
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tmp = bcma_cpu_clock(&dev->bus->drv_mips);
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if (tmp >= 480000000)
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tmp = 0x1846b; /* set CDR to 0x11(fast) */
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else if (tmp == 453000000)
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tmp = 0x1046b; /* set CDR to 0x10(slow) */
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else
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tmp = 0;
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/* Change Shim mdio control reg to fix host not acking at
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* high frequencies
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*/
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if (tmp) {
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bcma_write32(dev, 0x524, 0x1); /* write sel to enable */
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udelay(500);
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bcma_write32(dev, 0x524, tmp);
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udelay(500);
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bcma_write32(dev, 0x524, 0x4ab);
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udelay(500);
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bcma_read32(dev, 0x528);
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bcma_write32(dev, 0x528, 0x80000000);
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}
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}
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#endif /* CONFIG_BCMA_DRIVER_MIPS */
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}
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/* based on arch/mips/brcm-boards/bcm947xx/pcibios.c */
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static void bcma_hcd_init_chip(struct bcma_device *dev)
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{
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u32 tmp;
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/*
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* USB 2.0 special considerations:
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*
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* 1. Since the core supports both OHCI and EHCI functions, it must
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* only be reset once.
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*
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* 2. In addition to the standard SI reset sequence, the Host Control
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* Register must be programmed to bring the USB core and various
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* phy components out of reset.
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*/
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if (!bcma_core_is_enabled(dev)) {
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bcma_core_enable(dev, 0);
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mdelay(10);
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if (dev->id.rev >= 5) {
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/* Enable Misc PLL */
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tmp = bcma_read32(dev, 0x1e0);
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tmp |= 0x100;
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bcma_write32(dev, 0x1e0, tmp);
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if (bcma_wait_bits(dev, 0x1e0, 1 << 24, 100))
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printk(KERN_EMERG "Failed to enable misc PPL!\n");
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/* Take out of resets */
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bcma_write32(dev, 0x200, 0x4ff);
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udelay(25);
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bcma_write32(dev, 0x200, 0x6ff);
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udelay(25);
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/* Make sure digital and AFE are locked in USB PHY */
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bcma_write32(dev, 0x524, 0x6b);
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udelay(50);
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tmp = bcma_read32(dev, 0x524);
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udelay(50);
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bcma_write32(dev, 0x524, 0xab);
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udelay(50);
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tmp = bcma_read32(dev, 0x524);
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udelay(50);
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bcma_write32(dev, 0x524, 0x2b);
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udelay(50);
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tmp = bcma_read32(dev, 0x524);
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udelay(50);
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bcma_write32(dev, 0x524, 0x10ab);
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udelay(50);
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tmp = bcma_read32(dev, 0x524);
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if (bcma_wait_bits(dev, 0x528, 0xc000, 10000)) {
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tmp = bcma_read32(dev, 0x528);
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printk(KERN_EMERG
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"USB20H mdio_rddata 0x%08x\n", tmp);
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}
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bcma_write32(dev, 0x528, 0x80000000);
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tmp = bcma_read32(dev, 0x314);
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udelay(265);
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bcma_write32(dev, 0x200, 0x7ff);
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udelay(10);
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/* Take USB and HSIC out of non-driving modes */
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bcma_write32(dev, 0x510, 0);
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} else {
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bcma_write32(dev, 0x200, 0x7ff);
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udelay(1);
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}
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bcma_hcd_4716wa(dev);
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}
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}
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static const struct usb_ehci_pdata ehci_pdata = {
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};
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static const struct usb_ohci_pdata ohci_pdata = {
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};
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static struct platform_device *bcma_hcd_create_pdev(struct bcma_device *dev, bool ohci, u32 addr)
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{
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struct platform_device *hci_dev;
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struct resource hci_res[2];
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int ret = -ENOMEM;
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memset(hci_res, 0, sizeof(hci_res));
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hci_res[0].start = addr;
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hci_res[0].end = hci_res[0].start + 0x1000 - 1;
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hci_res[0].flags = IORESOURCE_MEM;
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hci_res[1].start = dev->irq;
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hci_res[1].flags = IORESOURCE_IRQ;
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hci_dev = platform_device_alloc(ohci ? "ohci-platform" :
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"ehci-platform" , 0);
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if (!hci_dev)
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return NULL;
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hci_dev->dev.parent = &dev->dev;
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hci_dev->dev.dma_mask = &hci_dev->dev.coherent_dma_mask;
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ret = platform_device_add_resources(hci_dev, hci_res,
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ARRAY_SIZE(hci_res));
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if (ret)
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goto err_alloc;
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if (ohci)
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ret = platform_device_add_data(hci_dev, &ohci_pdata,
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sizeof(ohci_pdata));
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else
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ret = platform_device_add_data(hci_dev, &ehci_pdata,
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sizeof(ehci_pdata));
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if (ret)
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goto err_alloc;
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ret = platform_device_add(hci_dev);
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if (ret)
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goto err_alloc;
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return hci_dev;
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err_alloc:
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platform_device_put(hci_dev);
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return ERR_PTR(ret);
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}
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static int bcma_hcd_probe(struct bcma_device *dev)
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{
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int err;
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u16 chipid_top;
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u32 ohci_addr;
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struct bcma_hcd_device *usb_dev;
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struct bcma_chipinfo *chipinfo;
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chipinfo = &dev->bus->chipinfo;
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/* USBcores are only connected on embedded devices. */
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chipid_top = (chipinfo->id & 0xFF00);
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if (chipid_top != 0x4700 && chipid_top != 0x5300)
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return -ENODEV;
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/* TODO: Probably need checks here; is the core connected? */
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if (dma_set_mask_and_coherent(dev->dma_dev, DMA_BIT_MASK(32)))
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return -EOPNOTSUPP;
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usb_dev = kzalloc(sizeof(struct bcma_hcd_device), GFP_KERNEL);
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if (!usb_dev)
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return -ENOMEM;
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bcma_hcd_init_chip(dev);
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/* In AI chips EHCI is addrspace 0, OHCI is 1 */
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ohci_addr = dev->addr_s[0];
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if ((chipinfo->id == 0x5357 || chipinfo->id == 0x4749)
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&& chipinfo->rev == 0)
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ohci_addr = 0x18009000;
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usb_dev->ohci_dev = bcma_hcd_create_pdev(dev, true, ohci_addr);
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if (IS_ERR(usb_dev->ohci_dev)) {
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err = PTR_ERR(usb_dev->ohci_dev);
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goto err_free_usb_dev;
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}
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usb_dev->ehci_dev = bcma_hcd_create_pdev(dev, false, dev->addr);
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if (IS_ERR(usb_dev->ehci_dev)) {
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err = PTR_ERR(usb_dev->ehci_dev);
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goto err_unregister_ohci_dev;
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}
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bcma_set_drvdata(dev, usb_dev);
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return 0;
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err_unregister_ohci_dev:
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platform_device_unregister(usb_dev->ohci_dev);
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err_free_usb_dev:
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kfree(usb_dev);
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return err;
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}
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static void bcma_hcd_remove(struct bcma_device *dev)
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{
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struct bcma_hcd_device *usb_dev = bcma_get_drvdata(dev);
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struct platform_device *ohci_dev = usb_dev->ohci_dev;
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struct platform_device *ehci_dev = usb_dev->ehci_dev;
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if (ohci_dev)
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platform_device_unregister(ohci_dev);
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if (ehci_dev)
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platform_device_unregister(ehci_dev);
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bcma_core_disable(dev, 0);
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}
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static void bcma_hcd_shutdown(struct bcma_device *dev)
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{
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bcma_core_disable(dev, 0);
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}
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#ifdef CONFIG_PM
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static int bcma_hcd_suspend(struct bcma_device *dev)
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{
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bcma_core_disable(dev, 0);
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return 0;
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}
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static int bcma_hcd_resume(struct bcma_device *dev)
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{
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bcma_core_enable(dev, 0);
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return 0;
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}
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#else /* !CONFIG_PM */
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#define bcma_hcd_suspend NULL
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#define bcma_hcd_resume NULL
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#endif /* CONFIG_PM */
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static const struct bcma_device_id bcma_hcd_table[] = {
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BCMA_CORE(BCMA_MANUF_BCM, BCMA_CORE_USB20_HOST, BCMA_ANY_REV, BCMA_ANY_CLASS),
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BCMA_CORETABLE_END
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};
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MODULE_DEVICE_TABLE(bcma, bcma_hcd_table);
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static struct bcma_driver bcma_hcd_driver = {
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.name = KBUILD_MODNAME,
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.id_table = bcma_hcd_table,
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.probe = bcma_hcd_probe,
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.remove = bcma_hcd_remove,
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.shutdown = bcma_hcd_shutdown,
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.suspend = bcma_hcd_suspend,
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.resume = bcma_hcd_resume,
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};
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static int __init bcma_hcd_init(void)
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{
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return bcma_driver_register(&bcma_hcd_driver);
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}
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module_init(bcma_hcd_init);
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static void __exit bcma_hcd_exit(void)
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{
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bcma_driver_unregister(&bcma_hcd_driver);
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}
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module_exit(bcma_hcd_exit);
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