text: // SPDX-License-Identifier: GPL-2.0
  /*
   * Driver for the NXP ISP1760 chip
   *
   * Copyright 2021 Linaro, Rui Miguel Silva
   * Copyright 2014 Laurent Pinchart
   * Copyright 2007 Sebastian Siewior
   *
   * Contacts:
   *	Sebastian Siewior <bigeasy@linutronix.de>
   *	Laurent Pinchart <laurent.pinchart@ideasonboard.com>
   *	Rui Miguel Silva <rui.silva@linaro.org>
   */
  
  #include <linux/delay.h>
  #include <linux/gpio/consumer.h>
  #include <linux/io.h>
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/regmap.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 int isp1760_init_core(struct isp1760_device *isp)
  {
  	struct isp1760_hcd *hcd = &isp->hcd;
  	struct isp1760_udc *udc = &isp->udc;
  	u32 otg_ctrl;
  
  	/* Low-level chip reset */
  	if (isp->rst_gpio) {
  		gpiod_set_value_cansleep(isp->rst_gpio, 1);
  		msleep(50);
  		gpiod_set_value_cansleep(isp->rst_gpio, 0);
  	}
  
  	/*
  	 * Reset the host controller, including the CPU interface
  	 * configuration.
  	 */
  	isp1760_field_set(hcd->fields, SW_RESET_RESET_ALL);
  	msleep(100);
  
  	/* Setup HW Mode Control: This assumes a level active-low interrupt */
  	if ((isp->devflags & ISP1760_FLAG_ANALOG_OC) && hcd->is_isp1763) {
  		dev_err(isp->dev, "isp1763 analog overcurrent not available\n");
  		return -EINVAL;
  	}
  
  	if (isp->devflags & ISP1760_FLAG_BUS_WIDTH_16)
  		isp1760_field_clear(hcd->fields, HW_DATA_BUS_WIDTH);
  	if (isp->devflags & ISP1760_FLAG_BUS_WIDTH_8)
  		isp1760_field_set(hcd->fields, HW_DATA_BUS_WIDTH);
  	if (isp->devflags & ISP1760_FLAG_ANALOG_OC)
  		isp1760_field_set(hcd->fields, HW_ANA_DIGI_OC);
  	if (isp->devflags & ISP1760_FLAG_DACK_POL_HIGH)
  		isp1760_field_set(hcd->fields, HW_DACK_POL_HIGH);
  	if (isp->devflags & ISP1760_FLAG_DREQ_POL_HIGH)
  		isp1760_field_set(hcd->fields, HW_DREQ_POL_HIGH);
  	if (isp->devflags & ISP1760_FLAG_INTR_POL_HIGH)
  		isp1760_field_set(hcd->fields, HW_INTR_HIGH_ACT);
  	if (isp->devflags & ISP1760_FLAG_INTR_EDGE_TRIG)
  		isp1760_field_set(hcd->fields, 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_reg_write(udc->regs, ISP176x_DC_MODE, 0);
  		isp1760_field_set(hcd->fields, HW_COMN_IRQ);
  	}
  
  	/*
  	 * 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
  	 */
  	if (isp->devflags & ISP1760_FLAG_ISP1761) {
  		if (isp->devflags & ISP1760_FLAG_PERIPHERAL_EN) {
  			otg_ctrl = (ISP176x_HW_DM_PULLDOWN_CLEAR |
  				    ISP176x_HW_DP_PULLDOWN_CLEAR |
  				    ISP176x_HW_OTG_DISABLE);
  		} else {
  			otg_ctrl = (ISP176x_HW_SW_SEL_HC_DC_CLEAR |
  				    ISP176x_HW_VBUS_DRV |
  				    ISP176x_HW_SEL_CP_EXT);
  		}
  		isp1760_reg_write(hcd->regs, ISP176x_HC_OTG_CTRL, otg_ctrl);
  	}
  
  	dev_info(isp->dev, "%s bus width: %u, oc: %s\n",
  		 hcd->is_isp1763 ? "isp1763" : "isp1760",
  		 isp->devflags & ISP1760_FLAG_BUS_WIDTH_8 ? 8 :
  		 isp->devflags & ISP1760_FLAG_BUS_WIDTH_16 ? 16 : 32,
  		 hcd->is_isp1763 ? "not available" :
  		 isp->devflags & ISP1760_FLAG_ANALOG_OC ? "analog" : "digital");
  
  	return 0;
  }
  
  void isp1760_set_pullup(struct isp1760_device *isp, bool enable)
  {
  	struct isp1760_udc *udc = &isp->udc;
  
  	if (enable)
  		isp1760_field_set(udc->fields, HW_DP_PULLUP);
  	else
  		isp1760_field_set(udc->fields, HW_DP_PULLUP_CLEAR);
  }
  
  /*
   * ISP1760/61:
   *
   * 60kb divided in:
   * - 32 blocks @ 256  bytes
   * - 20 blocks @ 1024 bytes
   * -  4 blocks @ 8192 bytes
   */
  static const struct isp1760_memory_layout isp176x_memory_conf = {
  	.blocks[0]		= 32,
  	.blocks_size[0]		= 256,
  	.blocks[1]		= 20,
  	.blocks_size[1]		= 1024,
  	.blocks[2]		= 4,
  	.blocks_size[2]		= 8192,
  
  	.slot_num		= 32,
  	.payload_blocks		= 32 + 20 + 4,
  	.payload_area_size	= 0xf000,
  };
  
  /*
   * ISP1763:
   *
   * 20kb divided in:
   * - 8 blocks @ 256  bytes
   * - 2 blocks @ 1024 bytes
   * - 4 blocks @ 4096 bytes
   */
  static const struct isp1760_memory_layout isp1763_memory_conf = {
  	.blocks[0]		= 8,
  	.blocks_size[0]		= 256,
  	.blocks[1]		= 2,
  	.blocks_size[1]		= 1024,
  	.blocks[2]		= 4,
  	.blocks_size[2]		= 4096,
  
  	.slot_num		= 16,
  	.payload_blocks		= 8 + 2 + 4,
  	.payload_area_size	= 0x5000,
  };
  
  static const struct regmap_range isp176x_hc_volatile_ranges[] = {
  	regmap_reg_range(ISP176x_HC_USBCMD, ISP176x_HC_ATL_PTD_LASTPTD),
  	regmap_reg_range(ISP176x_HC_BUFFER_STATUS, ISP176x_HC_MEMORY),
  	regmap_reg_range(ISP176x_HC_INTERRUPT, ISP176x_HC_OTG_CTRL_CLEAR),
  };
  
  static const struct regmap_access_table isp176x_hc_volatile_table = {
  	.yes_ranges	= isp176x_hc_volatile_ranges,
  	.n_yes_ranges	= ARRAY_SIZE(isp176x_hc_volatile_ranges),
  };
  
  static const struct regmap_config isp1760_hc_regmap_conf = {
  	.name = "isp1760-hc",
  	.reg_bits = 16,
  	.reg_stride = 4,
  	.val_bits = 32,
  	.fast_io = true,
  	.max_register = ISP176x_HC_OTG_CTRL_CLEAR,
  	.volatile_table = &isp176x_hc_volatile_table,
  };
  
  static const struct reg_field isp1760_hc_reg_fields[] = {
  	[HCS_PPC]		= REG_FIELD(ISP176x_HC_HCSPARAMS, 4, 4),
  	[HCS_N_PORTS]		= REG_FIELD(ISP176x_HC_HCSPARAMS, 0, 3),
  	[HCC_ISOC_CACHE]	= REG_FIELD(ISP176x_HC_HCCPARAMS, 7, 7),
  	[HCC_ISOC_THRES]	= REG_FIELD(ISP176x_HC_HCCPARAMS, 4, 6),
  	[CMD_LRESET]		= REG_FIELD(ISP176x_HC_USBCMD, 7, 7),
  	[CMD_RESET]		= REG_FIELD(ISP176x_HC_USBCMD, 1, 1),
  	[CMD_RUN]		= REG_FIELD(ISP176x_HC_USBCMD, 0, 0),
  	[STS_PCD]		= REG_FIELD(ISP176x_HC_USBSTS, 2, 2),
  	[HC_FRINDEX]		= REG_FIELD(ISP176x_HC_FRINDEX, 0, 13),
  	[FLAG_CF]		= REG_FIELD(ISP176x_HC_CONFIGFLAG, 0, 0),
  	[HC_ISO_PTD_DONEMAP]	= REG_FIELD(ISP176x_HC_ISO_PTD_DONEMAP, 0, 31),
  	[HC_ISO_PTD_SKIPMAP]	= REG_FIELD(ISP176x_HC_ISO_PTD_SKIPMAP, 0, 31),
  	[HC_ISO_PTD_LASTPTD]	= REG_FIELD(ISP176x_HC_ISO_PTD_LASTPTD, 0, 31),
  	[HC_INT_PTD_DONEMAP]	= REG_FIELD(ISP176x_HC_INT_PTD_DONEMAP, 0, 31),
  	[HC_INT_PTD_SKIPMAP]	= REG_FIELD(ISP176x_HC_INT_PTD_SKIPMAP, 0, 31),
  	[HC_INT_PTD_LASTPTD]	= REG_FIELD(ISP176x_HC_INT_PTD_LASTPTD, 0, 31),
  	[HC_ATL_PTD_DONEMAP]	= REG_FIELD(ISP176x_HC_ATL_PTD_DONEMAP, 0, 31),
  	[HC_ATL_PTD_SKIPMAP]	= REG_FIELD(ISP176x_HC_ATL_PTD_SKIPMAP, 0, 31),
  	[HC_ATL_PTD_LASTPTD]	= REG_FIELD(ISP176x_HC_ATL_PTD_LASTPTD, 0, 31),
  	[PORT_OWNER]		= REG_FIELD(ISP176x_HC_PORTSC1, 13, 13),
  	[PORT_POWER]		= REG_FIELD(ISP176x_HC_PORTSC1, 12, 12),
  	[PORT_LSTATUS]		= REG_FIELD(ISP176x_HC_PORTSC1, 10, 11),
  	[PORT_RESET]		= REG_FIELD(ISP176x_HC_PORTSC1, 8, 8),
  	[PORT_SUSPEND]		= REG_FIELD(ISP176x_HC_PORTSC1, 7, 7),
  	[PORT_RESUME]		= REG_FIELD(ISP176x_HC_PORTSC1, 6, 6),
  	[PORT_PE]		= REG_FIELD(ISP176x_HC_PORTSC1, 2, 2),
  	[PORT_CSC]		= REG_FIELD(ISP176x_HC_PORTSC1, 1, 1),
  	[PORT_CONNECT]		= REG_FIELD(ISP176x_HC_PORTSC1, 0, 0),
  	[ALL_ATX_RESET]		= REG_FIELD(ISP176x_HC_HW_MODE_CTRL, 31, 31),
  	[HW_ANA_DIGI_OC]	= REG_FIELD(ISP176x_HC_HW_MODE_CTRL, 15, 15),
  	[HW_COMN_IRQ]		= REG_FIELD(ISP176x_HC_HW_MODE_CTRL, 10, 10),
  	[HW_DATA_BUS_WIDTH]	= REG_FIELD(ISP176x_HC_HW_MODE_CTRL, 8, 8),
  	[HW_DACK_POL_HIGH]	= REG_FIELD(ISP176x_HC_HW_MODE_CTRL, 6, 6),
  	[HW_DREQ_POL_HIGH]	= REG_FIELD(ISP176x_HC_HW_MODE_CTRL, 5, 5),
  	[HW_INTR_HIGH_ACT]	= REG_FIELD(ISP176x_HC_HW_MODE_CTRL, 2, 2),
  	[HW_INTR_EDGE_TRIG]	= REG_FIELD(ISP176x_HC_HW_MODE_CTRL, 1, 1),
  	[HW_GLOBAL_INTR_EN]	= REG_FIELD(ISP176x_HC_HW_MODE_CTRL, 0, 0),
  	[HC_CHIP_REV]		= REG_FIELD(ISP176x_HC_CHIP_ID, 16, 31),
  	[HC_CHIP_ID_HIGH]	= REG_FIELD(ISP176x_HC_CHIP_ID, 8, 15),
  	[HC_CHIP_ID_LOW]	= REG_FIELD(ISP176x_HC_CHIP_ID, 0, 7),
  	[HC_SCRATCH]		= REG_FIELD(ISP176x_HC_SCRATCH, 0, 31),
  	[SW_RESET_RESET_ALL]	= REG_FIELD(ISP176x_HC_RESET, 0, 0),
  	[ISO_BUF_FILL]		= REG_FIELD(ISP176x_HC_BUFFER_STATUS, 2, 2),
  	[INT_BUF_FILL]		= REG_FIELD(ISP176x_HC_BUFFER_STATUS, 1, 1),
  	[ATL_BUF_FILL]		= REG_FIELD(ISP176x_HC_BUFFER_STATUS, 0, 0),
  	[MEM_BANK_SEL]		= REG_FIELD(ISP176x_HC_MEMORY, 16, 17),
  	[MEM_START_ADDR]	= REG_FIELD(ISP176x_HC_MEMORY, 0, 15),
  	[HC_INTERRUPT]		= REG_FIELD(ISP176x_HC_INTERRUPT, 0, 9),
  	[HC_ATL_IRQ_ENABLE]	= REG_FIELD(ISP176x_HC_INTERRUPT_ENABLE, 8, 8),
  	[HC_INT_IRQ_ENABLE]	= REG_FIELD(ISP176x_HC_INTERRUPT_ENABLE, 7, 7),
  	[HC_ISO_IRQ_MASK_OR]	= REG_FIELD(ISP176x_HC_ISO_IRQ_MASK_OR, 0, 31),
  	[HC_INT_IRQ_MASK_OR]	= REG_FIELD(ISP176x_HC_INT_IRQ_MASK_OR, 0, 31),
  	[HC_ATL_IRQ_MASK_OR]	= REG_FIELD(ISP176x_HC_ATL_IRQ_MASK_OR, 0, 31),
  	[HC_ISO_IRQ_MASK_AND]	= REG_FIELD(ISP176x_HC_ISO_IRQ_MASK_AND, 0, 31),
  	[HC_INT_IRQ_MASK_AND]	= REG_FIELD(ISP176x_HC_INT_IRQ_MASK_AND, 0, 31),
  	[HC_ATL_IRQ_MASK_AND]	= REG_FIELD(ISP176x_HC_ATL_IRQ_MASK_AND, 0, 31),
  	[HW_OTG_DISABLE_CLEAR]	= REG_FIELD(ISP176x_HC_OTG_CTRL, 26, 26),
  	[HW_SW_SEL_HC_DC_CLEAR]	= REG_FIELD(ISP176x_HC_OTG_CTRL, 23, 23),
  	[HW_VBUS_DRV_CLEAR]	= REG_FIELD(ISP176x_HC_OTG_CTRL, 20, 20),
  	[HW_SEL_CP_EXT_CLEAR]	= REG_FIELD(ISP176x_HC_OTG_CTRL, 19, 19),
  	[HW_DM_PULLDOWN_CLEAR]	= REG_FIELD(ISP176x_HC_OTG_CTRL, 18, 18),
  	[HW_DP_PULLDOWN_CLEAR]	= REG_FIELD(ISP176x_HC_OTG_CTRL, 17, 17),
  	[HW_DP_PULLUP_CLEAR]	= REG_FIELD(ISP176x_HC_OTG_CTRL, 16, 16),
  	[HW_OTG_DISABLE]	= REG_FIELD(ISP176x_HC_OTG_CTRL, 10, 10),
  	[HW_SW_SEL_HC_DC]	= REG_FIELD(ISP176x_HC_OTG_CTRL, 7, 7),
  	[HW_VBUS_DRV]		= REG_FIELD(ISP176x_HC_OTG_CTRL, 4, 4),
  	[HW_SEL_CP_EXT]		= REG_FIELD(ISP176x_HC_OTG_CTRL, 3, 3),
  	[HW_DM_PULLDOWN]	= REG_FIELD(ISP176x_HC_OTG_CTRL, 2, 2),
  	[HW_DP_PULLDOWN]	= REG_FIELD(ISP176x_HC_OTG_CTRL, 1, 1),
  	[HW_DP_PULLUP]		= REG_FIELD(ISP176x_HC_OTG_CTRL, 0, 0),
  };
  
  static const struct reg_field isp1763_hc_reg_fields[] = {
  	[CMD_LRESET]		= REG_FIELD(ISP1763_HC_USBCMD, 7, 7),
  	[CMD_RESET]		= REG_FIELD(ISP1763_HC_USBCMD, 1, 1),
  	[CMD_RUN]		= REG_FIELD(ISP1763_HC_USBCMD, 0, 0),
  	[STS_PCD]		= REG_FIELD(ISP1763_HC_USBSTS, 2, 2),
  	[HC_FRINDEX]		= REG_FIELD(ISP1763_HC_FRINDEX, 0, 13),
  	[FLAG_CF]		= REG_FIELD(ISP1763_HC_CONFIGFLAG, 0, 0),
  	[HC_ISO_PTD_DONEMAP]	= REG_FIELD(ISP1763_HC_ISO_PTD_DONEMAP, 0, 15),
  	[HC_ISO_PTD_SKIPMAP]	= REG_FIELD(ISP1763_HC_ISO_PTD_SKIPMAP, 0, 15),
  	[HC_ISO_PTD_LASTPTD]	= REG_FIELD(ISP1763_HC_ISO_PTD_LASTPTD, 0, 15),
  	[HC_INT_PTD_DONEMAP]	= REG_FIELD(ISP1763_HC_INT_PTD_DONEMAP, 0, 15),
  	[HC_INT_PTD_SKIPMAP]	= REG_FIELD(ISP1763_HC_INT_PTD_SKIPMAP, 0, 15),
  	[HC_INT_PTD_LASTPTD]	= REG_FIELD(ISP1763_HC_INT_PTD_LASTPTD, 0, 15),
  	[HC_ATL_PTD_DONEMAP]	= REG_FIELD(ISP1763_HC_ATL_PTD_DONEMAP, 0, 15),
  	[HC_ATL_PTD_SKIPMAP]	= REG_FIELD(ISP1763_HC_ATL_PTD_SKIPMAP, 0, 15),
  	[HC_ATL_PTD_LASTPTD]	= REG_FIELD(ISP1763_HC_ATL_PTD_LASTPTD, 0, 15),
  	[PORT_OWNER]		= REG_FIELD(ISP1763_HC_PORTSC1, 13, 13),
  	[PORT_POWER]		= REG_FIELD(ISP1763_HC_PORTSC1, 12, 12),
  	[PORT_LSTATUS]		= REG_FIELD(ISP1763_HC_PORTSC1, 10, 11),
  	[PORT_RESET]		= REG_FIELD(ISP1763_HC_PORTSC1, 8, 8),
  	[PORT_SUSPEND]		= REG_FIELD(ISP1763_HC_PORTSC1, 7, 7),
  	[PORT_RESUME]		= REG_FIELD(ISP1763_HC_PORTSC1, 6, 6),
  	[PORT_PE]		= REG_FIELD(ISP1763_HC_PORTSC1, 2, 2),
  	[PORT_CSC]		= REG_FIELD(ISP1763_HC_PORTSC1, 1, 1),
  	[PORT_CONNECT]		= REG_FIELD(ISP1763_HC_PORTSC1, 0, 0),
  	[HW_DATA_BUS_WIDTH]	= REG_FIELD(ISP1763_HC_HW_MODE_CTRL, 4, 4),
  	[HW_DACK_POL_HIGH]	= REG_FIELD(ISP1763_HC_HW_MODE_CTRL, 6, 6),
  	[HW_DREQ_POL_HIGH]	= REG_FIELD(ISP1763_HC_HW_MODE_CTRL, 5, 5),
  	[HW_INTF_LOCK]		= REG_FIELD(ISP1763_HC_HW_MODE_CTRL, 3, 3),
  	[HW_INTR_HIGH_ACT]	= REG_FIELD(ISP1763_HC_HW_MODE_CTRL, 2, 2),
  	[HW_INTR_EDGE_TRIG]	= REG_FIELD(ISP1763_HC_HW_MODE_CTRL, 1, 1),
  	[HW_GLOBAL_INTR_EN]	= REG_FIELD(ISP1763_HC_HW_MODE_CTRL, 0, 0),
  	[SW_RESET_RESET_ATX]	= REG_FIELD(ISP1763_HC_RESET, 3, 3),
  	[SW_RESET_RESET_ALL]	= REG_FIELD(ISP1763_HC_RESET, 0, 0),
  	[HC_CHIP_ID_HIGH]	= REG_FIELD(ISP1763_HC_CHIP_ID, 0, 15),
  	[HC_CHIP_ID_LOW]	= REG_FIELD(ISP1763_HC_CHIP_REV, 8, 15),
  	[HC_CHIP_REV]		= REG_FIELD(ISP1763_HC_CHIP_REV, 0, 7),
  	[HC_SCRATCH]		= REG_FIELD(ISP1763_HC_SCRATCH, 0, 15),
  	[ISO_BUF_FILL]		= REG_FIELD(ISP1763_HC_BUFFER_STATUS, 2, 2),
  	[INT_BUF_FILL]		= REG_FIELD(ISP1763_HC_BUFFER_STATUS, 1, 1),
  	[ATL_BUF_FILL]		= REG_FIELD(ISP1763_HC_BUFFER_STATUS, 0, 0),
  	[MEM_START_ADDR]	= REG_FIELD(ISP1763_HC_MEMORY, 0, 15),
  	[HC_DATA]		= REG_FIELD(ISP1763_HC_DATA, 0, 15),
  	[HC_INTERRUPT]		= REG_FIELD(ISP1763_HC_INTERRUPT, 0, 10),
  	[HC_ATL_IRQ_ENABLE]	= REG_FIELD(ISP1763_HC_INTERRUPT_ENABLE, 8, 8),
  	[HC_INT_IRQ_ENABLE]	= REG_FIELD(ISP1763_HC_INTERRUPT_ENABLE, 7, 7),
  	[HC_ISO_IRQ_MASK_OR]	= REG_FIELD(ISP1763_HC_ISO_IRQ_MASK_OR, 0, 15),
  	[HC_INT_IRQ_MASK_OR]	= REG_FIELD(ISP1763_HC_INT_IRQ_MASK_OR, 0, 15),
  	[HC_ATL_IRQ_MASK_OR]	= REG_FIELD(ISP1763_HC_ATL_IRQ_MASK_OR, 0, 15),
  	[HC_ISO_IRQ_MASK_AND]	= REG_FIELD(ISP1763_HC_ISO_IRQ_MASK_AND, 0, 15),
  	[HC_INT_IRQ_MASK_AND]	= REG_FIELD(ISP1763_HC_INT_IRQ_MASK_AND, 0, 15),
  	[HC_ATL_IRQ_MASK_AND]	= REG_FIELD(ISP1763_HC_ATL_IRQ_MASK_AND, 0, 15),
  	[HW_HC_2_DIS]		= REG_FIELD(ISP1763_HC_OTG_CTRL_SET, 15, 15),
  	[HW_OTG_DISABLE]	= REG_FIELD(ISP1763_HC_OTG_CTRL_SET, 10, 10),
  	[HW_SW_SEL_HC_DC]	= REG_FIELD(ISP1763_HC_OTG_CTRL_SET, 7, 7),
  	[HW_VBUS_DRV]		= REG_FIELD(ISP1763_HC_OTG_CTRL_SET, 4, 4),
  	[HW_SEL_CP_EXT]		= REG_FIELD(ISP1763_HC_OTG_CTRL_SET, 3, 3),
  	[HW_DM_PULLDOWN]	= REG_FIELD(ISP1763_HC_OTG_CTRL_SET, 2, 2),
  	[HW_DP_PULLDOWN]	= REG_FIELD(ISP1763_HC_OTG_CTRL_SET, 1, 1),
  	[HW_DP_PULLUP]		= REG_FIELD(ISP1763_HC_OTG_CTRL_SET, 0, 0),
  	[HW_HC_2_DIS_CLEAR]	= REG_FIELD(ISP1763_HC_OTG_CTRL_CLEAR, 15, 15),
  	[HW_OTG_DISABLE_CLEAR]	= REG_FIELD(ISP1763_HC_OTG_CTRL_CLEAR, 10, 10),
  	[HW_SW_SEL_HC_DC_CLEAR]	= REG_FIELD(ISP1763_HC_OTG_CTRL_CLEAR, 7, 7),
  	[HW_VBUS_DRV_CLEAR]	= REG_FIELD(ISP1763_HC_OTG_CTRL_CLEAR, 4, 4),
  	[HW_SEL_CP_EXT_CLEAR]	= REG_FIELD(ISP1763_HC_OTG_CTRL_CLEAR, 3, 3),
  	[HW_DM_PULLDOWN_CLEAR]	= REG_FIELD(ISP1763_HC_OTG_CTRL_CLEAR, 2, 2),
  	[HW_DP_PULLDOWN_CLEAR]	= REG_FIELD(ISP1763_HC_OTG_CTRL_CLEAR, 1, 1),
  	[HW_DP_PULLUP_CLEAR]	= REG_FIELD(ISP1763_HC_OTG_CTRL_CLEAR, 0, 0),
  };
  
  static const struct regmap_range isp1763_hc_volatile_ranges[] = {
  	regmap_reg_range(ISP1763_HC_USBCMD, ISP1763_HC_ATL_PTD_LASTPTD),
  	regmap_reg_range(ISP1763_HC_BUFFER_STATUS, ISP1763_HC_DATA),
  	regmap_reg_range(ISP1763_HC_INTERRUPT, ISP1763_HC_OTG_CTRL_CLEAR),
  };
  
  static const struct regmap_access_table isp1763_hc_volatile_table = {
  	.yes_ranges	= isp1763_hc_volatile_ranges,
  	.n_yes_ranges	= ARRAY_SIZE(isp1763_hc_volatile_ranges),
  };
  
  static const struct regmap_config isp1763_hc_regmap_conf = {
  	.name = "isp1763-hc",
  	.reg_bits = 8,
  	.reg_stride = 2,
  	.val_bits = 16,
  	.fast_io = true,
  	.max_register = ISP1763_HC_OTG_CTRL_CLEAR,
  	.volatile_table = &isp1763_hc_volatile_table,
  };
  
  static const struct regmap_range isp176x_dc_volatile_ranges[] = {
  	regmap_reg_range(ISP176x_DC_EPMAXPKTSZ, ISP176x_DC_EPTYPE),
  	regmap_reg_range(ISP176x_DC_BUFLEN, ISP176x_DC_EPINDEX),
  };
  
  static const struct regmap_access_table isp176x_dc_volatile_table = {
  	.yes_ranges	= isp176x_dc_volatile_ranges,
  	.n_yes_ranges	= ARRAY_SIZE(isp176x_dc_volatile_ranges),
  };
  
  static const struct regmap_config isp1761_dc_regmap_conf = {
  	.name = "isp1761-dc",
  	.reg_bits = 16,
  	.reg_stride = 4,
  	.val_bits = 32,
  	.fast_io = true,
  	.max_register = ISP176x_DC_TESTMODE,
  	.volatile_table = &isp176x_dc_volatile_table,
  };
  
  static const struct reg_field isp1761_dc_reg_fields[] = {
  	[DC_DEVEN]		= REG_FIELD(ISP176x_DC_ADDRESS, 7, 7),
  	[DC_DEVADDR]		= REG_FIELD(ISP176x_DC_ADDRESS, 0, 6),
  	[DC_VBUSSTAT]		= REG_FIELD(ISP176x_DC_MODE, 8, 8),
  	[DC_SFRESET]		= REG_FIELD(ISP176x_DC_MODE, 4, 4),
  	[DC_GLINTENA]		= REG_FIELD(ISP176x_DC_MODE, 3, 3),
  	[DC_CDBGMOD_ACK]	= REG_FIELD(ISP176x_DC_INTCONF, 6, 6),
  	[DC_DDBGMODIN_ACK]	= REG_FIELD(ISP176x_DC_INTCONF, 4, 4),
  	[DC_DDBGMODOUT_ACK]	= REG_FIELD(ISP176x_DC_INTCONF, 2, 2),
  	[DC_INTPOL]		= REG_FIELD(ISP176x_DC_INTCONF, 0, 0),
  	[DC_IEPRXTX_7]		= REG_FIELD(ISP176x_DC_INTENABLE, 25, 25),
  	[DC_IEPRXTX_6]		= REG_FIELD(ISP176x_DC_INTENABLE, 23, 23),
  	[DC_IEPRXTX_5]		= REG_FIELD(ISP176x_DC_INTENABLE, 21, 21),
  	[DC_IEPRXTX_4]		= REG_FIELD(ISP176x_DC_INTENABLE, 19, 19),
  	[DC_IEPRXTX_3]		= REG_FIELD(ISP176x_DC_INTENABLE, 17, 17),
  	[DC_IEPRXTX_2]		= REG_FIELD(ISP176x_DC_INTENABLE, 15, 15),
  	[DC_IEPRXTX_1]		= REG_FIELD(ISP176x_DC_INTENABLE, 13, 13),
  	[DC_IEPRXTX_0]		= REG_FIELD(ISP176x_DC_INTENABLE, 11, 11),
  	[DC_IEP0SETUP]		= REG_FIELD(ISP176x_DC_INTENABLE, 8, 8),
  	[DC_IEVBUS]		= REG_FIELD(ISP176x_DC_INTENABLE, 7, 7),
  	[DC_IEHS_STA]		= REG_FIELD(ISP176x_DC_INTENABLE, 5, 5),
  	[DC_IERESM]		= REG_FIELD(ISP176x_DC_INTENABLE, 4, 4),
  	[DC_IESUSP]		= REG_FIELD(ISP176x_DC_INTENABLE, 3, 3),
  	[DC_IEBRST]		= REG_FIELD(ISP176x_DC_INTENABLE, 0, 0),
  	[DC_EP0SETUP]		= REG_FIELD(ISP176x_DC_EPINDEX, 5, 5),
  	[DC_ENDPIDX]		= REG_FIELD(ISP176x_DC_EPINDEX, 1, 4),
  	[DC_EPDIR]		= REG_FIELD(ISP176x_DC_EPINDEX, 0, 0),
  	[DC_CLBUF]		= REG_FIELD(ISP176x_DC_CTRLFUNC, 4, 4),
  	[DC_VENDP]		= REG_FIELD(ISP176x_DC_CTRLFUNC, 3, 3),
  	[DC_DSEN]		= REG_FIELD(ISP176x_DC_CTRLFUNC, 2, 2),
  	[DC_STATUS]		= REG_FIELD(ISP176x_DC_CTRLFUNC, 1, 1),
  	[DC_STALL]		= REG_FIELD(ISP176x_DC_CTRLFUNC, 0, 0),
  	[DC_BUFLEN]		= REG_FIELD(ISP176x_DC_BUFLEN, 0, 15),
  	[DC_FFOSZ]		= REG_FIELD(ISP176x_DC_EPMAXPKTSZ, 0, 10),
  	[DC_EPENABLE]		= REG_FIELD(ISP176x_DC_EPTYPE, 3, 3),
  	[DC_ENDPTYP]		= REG_FIELD(ISP176x_DC_EPTYPE, 0, 1),
  	[DC_UFRAMENUM]		= REG_FIELD(ISP176x_DC_FRAMENUM, 11, 13),
  	[DC_FRAMENUM]		= REG_FIELD(ISP176x_DC_FRAMENUM, 0, 10),
  	[DC_CHIP_ID_HIGH]	= REG_FIELD(ISP176x_DC_CHIPID, 16, 31),
  	[DC_CHIP_ID_LOW]	= REG_FIELD(ISP176x_DC_CHIPID, 0, 15),
  	[DC_SCRATCH]		= REG_FIELD(ISP176x_DC_SCRATCH, 0, 15),
  };
  
  static const struct regmap_range isp1763_dc_volatile_ranges[] = {
  	regmap_reg_range(ISP1763_DC_EPMAXPKTSZ, ISP1763_DC_EPTYPE),
  	regmap_reg_range(ISP1763_DC_BUFLEN, ISP1763_DC_EPINDEX),
  };
  
  static const struct regmap_access_table isp1763_dc_volatile_table = {
  	.yes_ranges	= isp1763_dc_volatile_ranges,
  	.n_yes_ranges	= ARRAY_SIZE(isp1763_dc_volatile_ranges),
  };
  
  static const struct reg_field isp1763_dc_reg_fields[] = {
  	[DC_DEVEN]		= REG_FIELD(ISP1763_DC_ADDRESS, 7, 7),
  	[DC_DEVADDR]		= REG_FIELD(ISP1763_DC_ADDRESS, 0, 6),
  	[DC_VBUSSTAT]		= REG_FIELD(ISP1763_DC_MODE, 8, 8),
  	[DC_SFRESET]		= REG_FIELD(ISP1763_DC_MODE, 4, 4),
  	[DC_GLINTENA]		= REG_FIELD(ISP1763_DC_MODE, 3, 3),
  	[DC_CDBGMOD_ACK]	= REG_FIELD(ISP1763_DC_INTCONF, 6, 6),
  	[DC_DDBGMODIN_ACK]	= REG_FIELD(ISP1763_DC_INTCONF, 4, 4),
  	[DC_DDBGMODOUT_ACK]	= REG_FIELD(ISP1763_DC_INTCONF, 2, 2),
  	[DC_INTPOL]		= REG_FIELD(ISP1763_DC_INTCONF, 0, 0),
  	[DC_IEPRXTX_7]		= REG_FIELD(ISP1763_DC_INTENABLE, 25, 25),
  	[DC_IEPRXTX_6]		= REG_FIELD(ISP1763_DC_INTENABLE, 23, 23),
  	[DC_IEPRXTX_5]		= REG_FIELD(ISP1763_DC_INTENABLE, 21, 21),
  	[DC_IEPRXTX_4]		= REG_FIELD(ISP1763_DC_INTENABLE, 19, 19),
  	[DC_IEPRXTX_3]		= REG_FIELD(ISP1763_DC_INTENABLE, 17, 17),
  	[DC_IEPRXTX_2]		= REG_FIELD(ISP1763_DC_INTENABLE, 15, 15),
  	[DC_IEPRXTX_1]		= REG_FIELD(ISP1763_DC_INTENABLE, 13, 13),
  	[DC_IEPRXTX_0]		= REG_FIELD(ISP1763_DC_INTENABLE, 11, 11),
  	[DC_IEP0SETUP]		= REG_FIELD(ISP1763_DC_INTENABLE, 8, 8),
  	[DC_IEVBUS]		= REG_FIELD(ISP1763_DC_INTENABLE, 7, 7),
  	[DC_IEHS_STA]		= REG_FIELD(ISP1763_DC_INTENABLE, 5, 5),
  	[DC_IERESM]		= REG_FIELD(ISP1763_DC_INTENABLE, 4, 4),
  	[DC_IESUSP]		= REG_FIELD(ISP1763_DC_INTENABLE, 3, 3),
  	[DC_IEBRST]		= REG_FIELD(ISP1763_DC_INTENABLE, 0, 0),
  	[DC_EP0SETUP]		= REG_FIELD(ISP1763_DC_EPINDEX, 5, 5),
  	[DC_ENDPIDX]		= REG_FIELD(ISP1763_DC_EPINDEX, 1, 4),
  	[DC_EPDIR]		= REG_FIELD(ISP1763_DC_EPINDEX, 0, 0),
  	[DC_CLBUF]		= REG_FIELD(ISP1763_DC_CTRLFUNC, 4, 4),
  	[DC_VENDP]		= REG_FIELD(ISP1763_DC_CTRLFUNC, 3, 3),
  	[DC_DSEN]		= REG_FIELD(ISP1763_DC_CTRLFUNC, 2, 2),
  	[DC_STATUS]		= REG_FIELD(ISP1763_DC_CTRLFUNC, 1, 1),
  	[DC_STALL]		= REG_FIELD(ISP1763_DC_CTRLFUNC, 0, 0),
  	[DC_BUFLEN]		= REG_FIELD(ISP1763_DC_BUFLEN, 0, 15),
  	[DC_FFOSZ]		= REG_FIELD(ISP1763_DC_EPMAXPKTSZ, 0, 10),
  	[DC_EPENABLE]		= REG_FIELD(ISP1763_DC_EPTYPE, 3, 3),
  	[DC_ENDPTYP]		= REG_FIELD(ISP1763_DC_EPTYPE, 0, 1),
  	[DC_UFRAMENUM]		= REG_FIELD(ISP1763_DC_FRAMENUM, 11, 13),
  	[DC_FRAMENUM]		= REG_FIELD(ISP1763_DC_FRAMENUM, 0, 10),
  	[DC_CHIP_ID_HIGH]	= REG_FIELD(ISP1763_DC_CHIPID_HIGH, 0, 15),
  	[DC_CHIP_ID_LOW]	= REG_FIELD(ISP1763_DC_CHIPID_LOW, 0, 15),
  	[DC_SCRATCH]		= REG_FIELD(ISP1763_DC_SCRATCH, 0, 15),
  };
  
  static const struct regmap_config isp1763_dc_regmap_conf = {
  	.name = "isp1763-dc",
  	.reg_bits = 8,
  	.reg_stride = 2,
  	.val_bits = 16,
  	.fast_io = true,
  	.max_register = ISP1763_DC_TESTMODE,
  	.volatile_table = &isp1763_dc_volatile_table,
  };
  
  int isp1760_register(struct resource *mem, int irq, unsigned long irqflags,
  		     struct device *dev, unsigned int devflags)
  {
  	const struct regmap_config *hc_regmap;
  	const struct reg_field *hc_reg_fields;
  	const struct regmap_config *dc_regmap;
  	const struct reg_field *dc_reg_fields;
  	struct isp1760_device *isp;
  	struct isp1760_hcd *hcd;
  	struct isp1760_udc *udc;
  	struct regmap_field *f;
  	bool udc_enabled;
  	int ret;
  	int i;
  
  	/*
  	 * If neither the HCD not the UDC is enabled return an error, as no
  	 * device would be registered.
  	 */
  	udc_enabled = ((devflags & ISP1760_FLAG_ISP1763) ||
  		       (devflags & ISP1760_FLAG_ISP1761));
  
  	if ((!IS_ENABLED(CONFIG_USB_ISP1760_HCD) || usb_disabled()) &&
  	    (!udc_enabled || !IS_ENABLED(CONFIG_USB_ISP1761_UDC)))
  		return -ENODEV;
  
  	isp = devm_kzalloc(dev, sizeof(*isp), GFP_KERNEL);
  	if (!isp)
  		return -ENOMEM;
  
  	isp->dev = dev;
  	isp->devflags = devflags;
  	hcd = &isp->hcd;
  	udc = &isp->udc;
  
  	hcd->is_isp1763 = !!(devflags & ISP1760_FLAG_ISP1763);
  	udc->is_isp1763 = !!(devflags & ISP1760_FLAG_ISP1763);
  
  	if (!hcd->is_isp1763 && (devflags & ISP1760_FLAG_BUS_WIDTH_8)) {
  		dev_err(dev, "isp1760/61 do not support data width 8\n");
  		return -EINVAL;
  	}
  
  	if (hcd->is_isp1763) {
  		hc_regmap = &isp1763_hc_regmap_conf;
  		hc_reg_fields = &isp1763_hc_reg_fields[0];
  		dc_regmap = &isp1763_dc_regmap_conf;
  		dc_reg_fields = &isp1763_dc_reg_fields[0];
  	} else {
  		hc_regmap = &isp1760_hc_regmap_conf;
  		hc_reg_fields = &isp1760_hc_reg_fields[0];
  		dc_regmap = &isp1761_dc_regmap_conf;
  		dc_reg_fields = &isp1761_dc_reg_fields[0];
  	}
  
  	isp->rst_gpio = devm_gpiod_get_optional(dev, NULL, GPIOD_OUT_HIGH);
  	if (IS_ERR(isp->rst_gpio))
  		return PTR_ERR(isp->rst_gpio);
  
  	hcd->base = devm_ioremap_resource(dev, mem);
  	if (IS_ERR(hcd->base))
  		return PTR_ERR(hcd->base);
  
  	hcd->regs = devm_regmap_init_mmio(dev, hcd->base, hc_regmap);
  	if (IS_ERR(hcd->regs))
  		return PTR_ERR(hcd->regs);
  
  	for (i = 0; i < HC_FIELD_MAX; i++) {
  		f = devm_regmap_field_alloc(dev, hcd->regs, hc_reg_fields[i]);
  		if (IS_ERR(f))
  			return PTR_ERR(f);
  
  		hcd->fields[i] = f;
  	}
  
  	udc->regs = devm_regmap_init_mmio(dev, hcd->base, dc_regmap);
  	if (IS_ERR(udc->regs))
  		return PTR_ERR(udc->regs);
  
  	for (i = 0; i < DC_FIELD_MAX; i++) {
  		f = devm_regmap_field_alloc(dev, udc->regs, dc_reg_fields[i]);
  		if (IS_ERR(f))
  			return PTR_ERR(f);
  
  		udc->fields[i] = f;
  	}
  
  	if (hcd->is_isp1763)
  		hcd->memory_layout = &isp1763_memory_conf;
  	else
  		hcd->memory_layout = &isp176x_memory_conf;
  
  	ret = isp1760_init_core(isp);
  	if (ret < 0)
  		return ret;
  
  	if (IS_ENABLED(CONFIG_USB_ISP1760_HCD) && !usb_disabled()) {
  		ret = isp1760_hcd_register(hcd, mem, irq,
  					   irqflags | IRQF_SHARED, dev);
  		if (ret < 0)
  			return ret;
  	}
  
  	if (udc_enabled && IS_ENABLED(CONFIG_USB_ISP1761_UDC)) {
  		ret = isp1760_udc_register(isp, irq, irqflags);
  		if (ret < 0) {
  			isp1760_hcd_unregister(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");
  