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path: root/drivers/usb/host/bcma-hcd.c
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Diffstat (limited to 'drivers/usb/host/bcma-hcd.c')
-rw-r--r--drivers/usb/host/bcma-hcd.c500
1 files changed, 500 insertions, 0 deletions
diff --git a/drivers/usb/host/bcma-hcd.c b/drivers/usb/host/bcma-hcd.c
new file mode 100644
index 000000000..7558cc4d9
--- /dev/null
+++ b/drivers/usb/host/bcma-hcd.c
@@ -0,0 +1,500 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Broadcom specific Advanced Microcontroller Bus
+ * Broadcom USB-core driver (BCMA bus glue)
+ *
+ * Copyright 2011-2015 Hauke Mehrtens <hauke@hauke-m.de>
+ * Copyright 2015 Felix Fietkau <nbd@openwrt.org>
+ *
+ * Based on ssb-ohci driver
+ * Copyright 2007 Michael Buesch <m@bues.ch>
+ *
+ * Derived from the OHCI-PCI driver
+ * Copyright 1999 Roman Weissgaerber
+ * Copyright 2000-2002 David Brownell
+ * Copyright 1999 Linus Torvalds
+ * Copyright 1999 Gregory P. Smith
+ *
+ * Derived from the USBcore related parts of Broadcom-SB
+ * Copyright 2005-2011 Broadcom Corporation
+ */
+#include <linux/bcma/bcma.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
+#include <linux/usb/ehci_pdriver.h>
+#include <linux/usb/ohci_pdriver.h>
+
+MODULE_AUTHOR("Hauke Mehrtens");
+MODULE_DESCRIPTION("Common USB driver for BCMA Bus");
+MODULE_LICENSE("GPL");
+
+/* See BCMA_CLKCTLST_EXTRESREQ and BCMA_CLKCTLST_EXTRESST */
+#define USB_BCMA_CLKCTLST_USB_CLK_REQ 0x00000100
+
+struct bcma_hcd_device {
+ struct bcma_device *core;
+ struct platform_device *ehci_dev;
+ struct platform_device *ohci_dev;
+ struct gpio_desc *gpio_desc;
+};
+
+/* Wait for bitmask in a register to get set or cleared.
+ * timeout is in units of ten-microseconds.
+ */
+static int bcma_wait_bits(struct bcma_device *dev, u16 reg, u32 bitmask,
+ int timeout)
+{
+ int i;
+ u32 val;
+
+ for (i = 0; i < timeout; i++) {
+ val = bcma_read32(dev, reg);
+ if ((val & bitmask) == bitmask)
+ return 0;
+ udelay(10);
+ }
+
+ return -ETIMEDOUT;
+}
+
+static void bcma_hcd_4716wa(struct bcma_device *dev)
+{
+#ifdef CONFIG_BCMA_DRIVER_MIPS
+ /* Work around for 4716 failures. */
+ if (dev->bus->chipinfo.id == 0x4716) {
+ u32 tmp;
+
+ tmp = bcma_cpu_clock(&dev->bus->drv_mips);
+ if (tmp >= 480000000)
+ tmp = 0x1846b; /* set CDR to 0x11(fast) */
+ else if (tmp == 453000000)
+ tmp = 0x1046b; /* set CDR to 0x10(slow) */
+ else
+ tmp = 0;
+
+ /* Change Shim mdio control reg to fix host not acking at
+ * high frequencies
+ */
+ if (tmp) {
+ bcma_write32(dev, 0x524, 0x1); /* write sel to enable */
+ udelay(500);
+
+ bcma_write32(dev, 0x524, tmp);
+ udelay(500);
+ bcma_write32(dev, 0x524, 0x4ab);
+ udelay(500);
+ bcma_read32(dev, 0x528);
+ bcma_write32(dev, 0x528, 0x80000000);
+ }
+ }
+#endif /* CONFIG_BCMA_DRIVER_MIPS */
+}
+
+/* based on arch/mips/brcm-boards/bcm947xx/pcibios.c */
+static void bcma_hcd_init_chip_mips(struct bcma_device *dev)
+{
+ u32 tmp;
+
+ /*
+ * USB 2.0 special considerations:
+ *
+ * 1. Since the core supports both OHCI and EHCI functions, it must
+ * only be reset once.
+ *
+ * 2. In addition to the standard SI reset sequence, the Host Control
+ * Register must be programmed to bring the USB core and various
+ * phy components out of reset.
+ */
+ if (!bcma_core_is_enabled(dev)) {
+ bcma_core_enable(dev, 0);
+ mdelay(10);
+ if (dev->id.rev >= 5) {
+ /* Enable Misc PLL */
+ tmp = bcma_read32(dev, 0x1e0);
+ tmp |= 0x100;
+ bcma_write32(dev, 0x1e0, tmp);
+ if (bcma_wait_bits(dev, 0x1e0, 1 << 24, 100))
+ printk(KERN_EMERG "Failed to enable misc PPL!\n");
+
+ /* Take out of resets */
+ bcma_write32(dev, 0x200, 0x4ff);
+ udelay(25);
+ bcma_write32(dev, 0x200, 0x6ff);
+ udelay(25);
+
+ /* Make sure digital and AFE are locked in USB PHY */
+ bcma_write32(dev, 0x524, 0x6b);
+ udelay(50);
+ tmp = bcma_read32(dev, 0x524);
+ udelay(50);
+ bcma_write32(dev, 0x524, 0xab);
+ udelay(50);
+ tmp = bcma_read32(dev, 0x524);
+ udelay(50);
+ bcma_write32(dev, 0x524, 0x2b);
+ udelay(50);
+ tmp = bcma_read32(dev, 0x524);
+ udelay(50);
+ bcma_write32(dev, 0x524, 0x10ab);
+ udelay(50);
+ tmp = bcma_read32(dev, 0x524);
+
+ if (bcma_wait_bits(dev, 0x528, 0xc000, 10000)) {
+ tmp = bcma_read32(dev, 0x528);
+ printk(KERN_EMERG
+ "USB20H mdio_rddata 0x%08x\n", tmp);
+ }
+ bcma_write32(dev, 0x528, 0x80000000);
+ tmp = bcma_read32(dev, 0x314);
+ udelay(265);
+ bcma_write32(dev, 0x200, 0x7ff);
+ udelay(10);
+
+ /* Take USB and HSIC out of non-driving modes */
+ bcma_write32(dev, 0x510, 0);
+ } else {
+ bcma_write32(dev, 0x200, 0x7ff);
+
+ udelay(1);
+ }
+
+ bcma_hcd_4716wa(dev);
+ }
+}
+
+/*
+ * bcma_hcd_usb20_old_arm_init - Initialize old USB 2.0 controller on ARM
+ *
+ * Old USB 2.0 core is identified as BCMA_CORE_USB20_HOST and was introduced
+ * long before Northstar devices. It seems some cheaper chipsets like BCM53573
+ * still use it.
+ * Initialization of this old core differs between MIPS and ARM.
+ */
+static int bcma_hcd_usb20_old_arm_init(struct bcma_hcd_device *usb_dev)
+{
+ struct bcma_device *core = usb_dev->core;
+ struct device *dev = &core->dev;
+ struct bcma_device *pmu_core;
+
+ usleep_range(10000, 20000);
+ if (core->id.rev < 5)
+ return 0;
+
+ pmu_core = bcma_find_core(core->bus, BCMA_CORE_PMU);
+ if (!pmu_core) {
+ dev_err(dev, "Could not find PMU core\n");
+ return -ENOENT;
+ }
+
+ /* Take USB core out of reset */
+ bcma_awrite32(core, BCMA_IOCTL, BCMA_IOCTL_CLK | BCMA_IOCTL_FGC);
+ usleep_range(100, 200);
+ bcma_awrite32(core, BCMA_RESET_CTL, BCMA_RESET_CTL_RESET);
+ usleep_range(100, 200);
+ bcma_awrite32(core, BCMA_RESET_CTL, 0);
+ usleep_range(100, 200);
+ bcma_awrite32(core, BCMA_IOCTL, BCMA_IOCTL_CLK);
+ usleep_range(100, 200);
+
+ /* Enable Misc PLL */
+ bcma_write32(core, BCMA_CLKCTLST, BCMA_CLKCTLST_FORCEHT |
+ BCMA_CLKCTLST_HQCLKREQ |
+ USB_BCMA_CLKCTLST_USB_CLK_REQ);
+ usleep_range(100, 200);
+
+ bcma_write32(core, 0x510, 0xc7f85000);
+ bcma_write32(core, 0x510, 0xc7f85003);
+ usleep_range(300, 600);
+
+ /* Program USB PHY PLL parameters */
+ bcma_write32(pmu_core, BCMA_CC_PMU_PLLCTL_ADDR, 0x6);
+ bcma_write32(pmu_core, BCMA_CC_PMU_PLLCTL_DATA, 0x005360c1);
+ usleep_range(100, 200);
+ bcma_write32(pmu_core, BCMA_CC_PMU_PLLCTL_ADDR, 0x7);
+ bcma_write32(pmu_core, BCMA_CC_PMU_PLLCTL_DATA, 0x0);
+ usleep_range(100, 200);
+ bcma_set32(pmu_core, BCMA_CC_PMU_CTL, BCMA_CC_PMU_CTL_PLL_UPD);
+ usleep_range(100, 200);
+
+ bcma_write32(core, 0x510, 0x7f8d007);
+ udelay(1000);
+
+ /* Take controller out of reset */
+ bcma_write32(core, 0x200, 0x4ff);
+ usleep_range(25, 50);
+ bcma_write32(core, 0x200, 0x6ff);
+ usleep_range(25, 50);
+ bcma_write32(core, 0x200, 0x7ff);
+ usleep_range(25, 50);
+
+ of_platform_default_populate(dev->of_node, NULL, dev);
+
+ return 0;
+}
+
+static void bcma_hcd_usb20_ns_init_hc(struct bcma_device *dev)
+{
+ u32 val;
+
+ /* Set packet buffer OUT threshold */
+ val = bcma_read32(dev, 0x94);
+ val &= 0xffff;
+ val |= 0x80 << 16;
+ bcma_write32(dev, 0x94, val);
+
+ /* Enable break memory transfer */
+ val = bcma_read32(dev, 0x9c);
+ val |= 1;
+ bcma_write32(dev, 0x9c, val);
+
+ /*
+ * Broadcom initializes PHY and then waits to ensure HC is ready to be
+ * configured. In our case the order is reversed. We just initialized
+ * controller and we let HCD initialize PHY, so let's wait (sleep) now.
+ */
+ usleep_range(1000, 2000);
+}
+
+/*
+ * bcma_hcd_usb20_ns_init - Initialize Northstar USB 2.0 controller
+ */
+static int bcma_hcd_usb20_ns_init(struct bcma_hcd_device *bcma_hcd)
+{
+ struct bcma_device *core = bcma_hcd->core;
+ struct bcma_chipinfo *ci = &core->bus->chipinfo;
+ struct device *dev = &core->dev;
+
+ bcma_core_enable(core, 0);
+
+ if (ci->id == BCMA_CHIP_ID_BCM4707 ||
+ ci->id == BCMA_CHIP_ID_BCM53018)
+ bcma_hcd_usb20_ns_init_hc(core);
+
+ of_platform_default_populate(dev->of_node, NULL, dev);
+
+ return 0;
+}
+
+static void bcma_hci_platform_power_gpio(struct bcma_device *dev, bool val)
+{
+ struct bcma_hcd_device *usb_dev = bcma_get_drvdata(dev);
+
+ if (!usb_dev->gpio_desc)
+ return;
+
+ gpiod_set_value(usb_dev->gpio_desc, val);
+}
+
+static const struct usb_ehci_pdata ehci_pdata = {
+};
+
+static const struct usb_ohci_pdata ohci_pdata = {
+};
+
+static struct platform_device *bcma_hcd_create_pdev(struct bcma_device *dev,
+ const char *name, u32 addr,
+ const void *data,
+ size_t size)
+{
+ struct platform_device *hci_dev;
+ struct resource hci_res[2];
+ int ret;
+
+ memset(hci_res, 0, sizeof(hci_res));
+
+ hci_res[0].start = addr;
+ hci_res[0].end = hci_res[0].start + 0x1000 - 1;
+ hci_res[0].flags = IORESOURCE_MEM;
+
+ hci_res[1].start = dev->irq;
+ hci_res[1].flags = IORESOURCE_IRQ;
+
+ hci_dev = platform_device_alloc(name, 0);
+ if (!hci_dev)
+ return ERR_PTR(-ENOMEM);
+
+ hci_dev->dev.parent = &dev->dev;
+ hci_dev->dev.dma_mask = &hci_dev->dev.coherent_dma_mask;
+
+ ret = platform_device_add_resources(hci_dev, hci_res,
+ ARRAY_SIZE(hci_res));
+ if (ret)
+ goto err_alloc;
+ if (data)
+ ret = platform_device_add_data(hci_dev, data, size);
+ if (ret)
+ goto err_alloc;
+ ret = platform_device_add(hci_dev);
+ if (ret)
+ goto err_alloc;
+
+ return hci_dev;
+
+err_alloc:
+ platform_device_put(hci_dev);
+ return ERR_PTR(ret);
+}
+
+static int bcma_hcd_usb20_init(struct bcma_hcd_device *usb_dev)
+{
+ struct bcma_device *dev = usb_dev->core;
+ struct bcma_chipinfo *chipinfo = &dev->bus->chipinfo;
+ u32 ohci_addr;
+ int err;
+
+ if (dma_set_mask_and_coherent(dev->dma_dev, DMA_BIT_MASK(32)))
+ return -EOPNOTSUPP;
+
+ bcma_hcd_init_chip_mips(dev);
+
+ /* In AI chips EHCI is addrspace 0, OHCI is 1 */
+ ohci_addr = dev->addr_s[0];
+ if ((chipinfo->id == BCMA_CHIP_ID_BCM5357 ||
+ chipinfo->id == BCMA_CHIP_ID_BCM4749)
+ && chipinfo->rev == 0)
+ ohci_addr = 0x18009000;
+
+ usb_dev->ohci_dev = bcma_hcd_create_pdev(dev, "ohci-platform",
+ ohci_addr, &ohci_pdata,
+ sizeof(ohci_pdata));
+ if (IS_ERR(usb_dev->ohci_dev))
+ return PTR_ERR(usb_dev->ohci_dev);
+
+ usb_dev->ehci_dev = bcma_hcd_create_pdev(dev, "ehci-platform",
+ dev->addr, &ehci_pdata,
+ sizeof(ehci_pdata));
+ if (IS_ERR(usb_dev->ehci_dev)) {
+ err = PTR_ERR(usb_dev->ehci_dev);
+ goto err_unregister_ohci_dev;
+ }
+
+ return 0;
+
+err_unregister_ohci_dev:
+ platform_device_unregister(usb_dev->ohci_dev);
+ return err;
+}
+
+static int bcma_hcd_usb30_init(struct bcma_hcd_device *bcma_hcd)
+{
+ struct bcma_device *core = bcma_hcd->core;
+ struct device *dev = &core->dev;
+
+ bcma_core_enable(core, 0);
+
+ of_platform_default_populate(dev->of_node, NULL, dev);
+
+ return 0;
+}
+
+static int bcma_hcd_probe(struct bcma_device *core)
+{
+ int err;
+ struct bcma_hcd_device *usb_dev;
+
+ /* TODO: Probably need checks here; is the core connected? */
+
+ usb_dev = devm_kzalloc(&core->dev, sizeof(struct bcma_hcd_device),
+ GFP_KERNEL);
+ if (!usb_dev)
+ return -ENOMEM;
+ usb_dev->core = core;
+
+ usb_dev->gpio_desc = devm_gpiod_get_optional(&core->dev, "vcc",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(usb_dev->gpio_desc))
+ return dev_err_probe(&core->dev, PTR_ERR(usb_dev->gpio_desc),
+ "error obtaining VCC GPIO");
+
+ switch (core->id.id) {
+ case BCMA_CORE_USB20_HOST:
+ if (IS_ENABLED(CONFIG_ARM))
+ err = bcma_hcd_usb20_old_arm_init(usb_dev);
+ else if (IS_ENABLED(CONFIG_MIPS))
+ err = bcma_hcd_usb20_init(usb_dev);
+ else
+ err = -ENOTSUPP;
+ break;
+ case BCMA_CORE_NS_USB20:
+ err = bcma_hcd_usb20_ns_init(usb_dev);
+ break;
+ case BCMA_CORE_NS_USB30:
+ err = bcma_hcd_usb30_init(usb_dev);
+ break;
+ default:
+ return -ENODEV;
+ }
+ if (err)
+ return err;
+
+ bcma_set_drvdata(core, usb_dev);
+ return 0;
+}
+
+static void bcma_hcd_remove(struct bcma_device *dev)
+{
+ struct bcma_hcd_device *usb_dev = bcma_get_drvdata(dev);
+ struct platform_device *ohci_dev = usb_dev->ohci_dev;
+ struct platform_device *ehci_dev = usb_dev->ehci_dev;
+
+ if (ohci_dev)
+ platform_device_unregister(ohci_dev);
+ if (ehci_dev)
+ platform_device_unregister(ehci_dev);
+
+ bcma_core_disable(dev, 0);
+}
+
+static void bcma_hcd_shutdown(struct bcma_device *dev)
+{
+ bcma_hci_platform_power_gpio(dev, false);
+ bcma_core_disable(dev, 0);
+}
+
+#ifdef CONFIG_PM
+
+static int bcma_hcd_suspend(struct bcma_device *dev)
+{
+ bcma_hci_platform_power_gpio(dev, false);
+ bcma_core_disable(dev, 0);
+
+ return 0;
+}
+
+static int bcma_hcd_resume(struct bcma_device *dev)
+{
+ bcma_hci_platform_power_gpio(dev, true);
+ bcma_core_enable(dev, 0);
+
+ return 0;
+}
+
+#else /* !CONFIG_PM */
+#define bcma_hcd_suspend NULL
+#define bcma_hcd_resume NULL
+#endif /* CONFIG_PM */
+
+static const struct bcma_device_id bcma_hcd_table[] = {
+ BCMA_CORE(BCMA_MANUF_BCM, BCMA_CORE_USB20_HOST, BCMA_ANY_REV, BCMA_ANY_CLASS),
+ BCMA_CORE(BCMA_MANUF_BCM, BCMA_CORE_NS_USB20, BCMA_ANY_REV, BCMA_ANY_CLASS),
+ BCMA_CORE(BCMA_MANUF_BCM, BCMA_CORE_NS_USB30, BCMA_ANY_REV, BCMA_ANY_CLASS),
+ {},
+};
+MODULE_DEVICE_TABLE(bcma, bcma_hcd_table);
+
+static struct bcma_driver bcma_hcd_driver = {
+ .name = KBUILD_MODNAME,
+ .id_table = bcma_hcd_table,
+ .probe = bcma_hcd_probe,
+ .remove = bcma_hcd_remove,
+ .shutdown = bcma_hcd_shutdown,
+ .suspend = bcma_hcd_suspend,
+ .resume = bcma_hcd_resume,
+};
+module_bcma_driver(bcma_hcd_driver);
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-18 12:21:47 +0000