--- /dev/null
+/*
+ * 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);
+ 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");
Code Review / kvmfornfv.git / blobdiff