diff options
Diffstat (limited to 'drivers/usb/isp1760/isp1760-core.c')
| -rw-r--r-- | drivers/usb/isp1760/isp1760-core.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/usb/isp1760/isp1760-core.c b/drivers/usb/isp1760/isp1760-core.c new file mode 100644 index 000000000000..b9827556455f --- /dev/null +++ b/drivers/usb/isp1760/isp1760-core.c @@ -0,0 +1,177 @@ +/* + * Driver for the NXP ISP1760 chip + * + * Copyright 2014 Laurent Pinchart + * Copyright 2007 Sebastian Siewior + * + * Contacts: + * Sebastian Siewior <bigeasy@linutronix.de> + * Laurent Pinchart <laurent.pinchart@ideasonboard.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + */ + +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/usb.h> + +#include "isp1760-core.h" +#include "isp1760-hcd.h" +#include "isp1760-regs.h" +#include "isp1760-udc.h" + +static void isp1760_init_core(struct isp1760_device *isp) +{ + u32 otgctrl; + u32 hwmode; + + /* Low-level chip reset */ + if (isp->rst_gpio) { + gpiod_set_value_cansleep(isp->rst_gpio, 1); + mdelay(50); + gpiod_set_value_cansleep(isp->rst_gpio, 0); + } + + /* + * Reset the host controller, including the CPU interface + * configuration. + */ + isp1760_write32(isp->regs, HC_RESET_REG, SW_RESET_RESET_ALL); + msleep(100); + + /* Setup HW Mode Control: This assumes a level active-low interrupt */ + hwmode = HW_DATA_BUS_32BIT; + + if (isp->devflags & ISP1760_FLAG_BUS_WIDTH_16) + hwmode &= ~HW_DATA_BUS_32BIT; + if (isp->devflags & ISP1760_FLAG_ANALOG_OC) + hwmode |= HW_ANA_DIGI_OC; + if (isp->devflags & ISP1760_FLAG_DACK_POL_HIGH) + hwmode |= HW_DACK_POL_HIGH; + if (isp->devflags & ISP1760_FLAG_DREQ_POL_HIGH) + hwmode |= HW_DREQ_POL_HIGH; + if (isp->devflags & ISP1760_FLAG_INTR_POL_HIGH) + hwmode |= HW_INTR_HIGH_ACT; + if (isp->devflags & ISP1760_FLAG_INTR_EDGE_TRIG) + hwmode |= HW_INTR_EDGE_TRIG; + + /* + * The ISP1761 has a dedicated DC IRQ line but supports sharing the HC + * IRQ line for both the host and device controllers. Hardcode IRQ + * sharing for now and disable the DC interrupts globally to avoid + * spurious interrupts during HCD registration. + */ + if (isp->devflags & ISP1760_FLAG_ISP1761) { + isp1760_write32(isp->regs, DC_MODE, 0); + hwmode |= HW_COMN_IRQ; + } + + /* + * We have to set this first in case we're in 16-bit mode. + * Write it twice to ensure correct upper bits if switching + * to 16-bit mode. + */ + isp1760_write32(isp->regs, HC_HW_MODE_CTRL, hwmode); + isp1760_write32(isp->regs, HC_HW_MODE_CTRL, hwmode); + + /* + * PORT 1 Control register of the ISP1760 is the OTG control register + * on ISP1761. + * + * TODO: Really support OTG. For now we configure port 1 in device mode + * when OTG is requested. + */ + if ((isp->devflags & ISP1760_FLAG_ISP1761) && + (isp->devflags & ISP1760_FLAG_OTG_EN)) + otgctrl = ((HW_DM_PULLDOWN | HW_DP_PULLDOWN) << 16) + | HW_OTG_DISABLE; + else + otgctrl = (HW_SW_SEL_HC_DC << 16) + | (HW_VBUS_DRV | HW_SEL_CP_EXT); + + isp1760_write32(isp->regs, HC_PORT1_CTRL, otgctrl); + + dev_info(isp->dev, "bus width: %u, oc: %s\n", + isp->devflags & ISP1760_FLAG_BUS_WIDTH_16 ? 16 : 32, + isp->devflags & ISP1760_FLAG_ANALOG_OC ? "analog" : "digital"); +} + +void isp1760_set_pullup(struct isp1760_device *isp, bool enable) +{ + isp1760_write32(isp->regs, HW_OTG_CTRL_SET, + enable ? HW_DP_PULLUP : HW_DP_PULLUP << 16); +} + +int isp1760_register(struct resource *mem, int irq, unsigned long irqflags, + struct device *dev, unsigned int devflags) +{ + struct isp1760_device *isp; + bool udc_disabled = !(devflags & ISP1760_FLAG_ISP1761); + int ret; + + /* + * If neither the HCD not the UDC is enabled return an error, as no + * device would be registered. + */ + if ((!IS_ENABLED(CONFIG_USB_ISP1760_HCD) || usb_disabled()) && + (!IS_ENABLED(CONFIG_USB_ISP1761_UDC) || udc_disabled)) + return -ENODEV; + + /* prevent usb-core allocating DMA pages */ + dev->dma_mask = NULL; + + isp = devm_kzalloc(dev, sizeof(*isp), GFP_KERNEL); + if (!isp) + return -ENOMEM; + + isp->dev = dev; + isp->devflags = devflags; + + isp->rst_gpio = devm_gpiod_get_optional(dev, NULL, GPIOD_OUT_HIGH); + if (IS_ERR(isp->rst_gpio)) + return PTR_ERR(isp->rst_gpio); + + isp->regs = devm_ioremap_resource(dev, mem); + if (IS_ERR(isp->regs)) + return PTR_ERR(isp->regs); + + isp1760_init_core(isp); + + if (IS_ENABLED(CONFIG_USB_ISP1760_HCD) && !usb_disabled()) { + ret = isp1760_hcd_register(&isp->hcd, isp->regs, mem, irq, + irqflags | IRQF_SHARED, dev); + if (ret < 0) + return ret; + } + + if (IS_ENABLED(CONFIG_USB_ISP1761_UDC) && !udc_disabled) { + ret = isp1760_udc_register(isp, irq, irqflags | IRQF_SHARED | + IRQF_DISABLED); + if (ret < 0) { + isp1760_hcd_unregister(&isp->hcd); + return ret; + } + } + + dev_set_drvdata(dev, isp); + + return 0; +} + +void isp1760_unregister(struct device *dev) +{ + struct isp1760_device *isp = dev_get_drvdata(dev); + + isp1760_udc_unregister(isp); + isp1760_hcd_unregister(&isp->hcd); +} + +MODULE_DESCRIPTION("Driver for the ISP1760 USB-controller from NXP"); +MODULE_AUTHOR("Sebastian Siewior <bigeasy@linuxtronix.de>"); +MODULE_LICENSE("GPL v2"); |