drivers/usb/isp1760/isp1760-core.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Driver for the NXP ISP1760 chip
   4  *
   5  * Copyright 2014 Laurent Pinchart
   6  * Copyright 2007 Sebastian Siewior
   7  *
   8  * Contacts:
   9  *      Sebastian Siewior <bigeasy@linutronix.de>
  10  *      Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/gpio/consumer.h>
  15 #include <linux/io.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/slab.h>
  19 #include <linux/usb.h>
  20
  21 #include "isp1760-core.h"
  22 #include "isp1760-hcd.h"
  23 #include "isp1760-regs.h"
  24 #include "isp1760-udc.h"
  25
  26 static void isp1760_init_core(struct isp1760_device *isp)
  27 {
  28         u32 otgctrl;
  29         u32 hwmode;
  30
  31         /* Low-level chip reset */
  32         if (isp->rst_gpio) {
  33                 gpiod_set_value_cansleep(isp->rst_gpio, 1);
  34                 mdelay(50);
  35                 gpiod_set_value_cansleep(isp->rst_gpio, 0);
  36         }
  37
  38         /*
  39          * Reset the host controller, including the CPU interface
  40          * configuration.
  41          */
  42         isp1760_write32(isp->regs, HC_RESET_REG, SW_RESET_RESET_ALL);
  43         msleep(100);
  44
  45         /* Setup HW Mode Control: This assumes a level active-low interrupt */
  46         hwmode = HW_DATA_BUS_32BIT;
  47
  48         if (isp->devflags & ISP1760_FLAG_BUS_WIDTH_16)
  49                 hwmode &= ~HW_DATA_BUS_32BIT;
  50         if (isp->devflags & ISP1760_FLAG_ANALOG_OC)
  51                 hwmode |= HW_ANA_DIGI_OC;
  52         if (isp->devflags & ISP1760_FLAG_DACK_POL_HIGH)
  53                 hwmode |= HW_DACK_POL_HIGH;
  54         if (isp->devflags & ISP1760_FLAG_DREQ_POL_HIGH)
  55                 hwmode |= HW_DREQ_POL_HIGH;
  56         if (isp->devflags & ISP1760_FLAG_INTR_POL_HIGH)
  57                 hwmode |= HW_INTR_HIGH_ACT;
  58         if (isp->devflags & ISP1760_FLAG_INTR_EDGE_TRIG)
  59                 hwmode |= HW_INTR_EDGE_TRIG;
  60
  61         /*
  62          * The ISP1761 has a dedicated DC IRQ line but supports sharing the HC
  63          * IRQ line for both the host and device controllers. Hardcode IRQ
  64          * sharing for now and disable the DC interrupts globally to avoid
  65          * spurious interrupts during HCD registration.
  66          */
  67         if (isp->devflags & ISP1760_FLAG_ISP1761) {
  68                 isp1760_write32(isp->regs, DC_MODE, 0);
  69                 hwmode |= HW_COMN_IRQ;
  70         }
  71
  72         /*
  73          * We have to set this first in case we're in 16-bit mode.
  74          * Write it twice to ensure correct upper bits if switching
  75          * to 16-bit mode.
  76          */
  77         isp1760_write32(isp->regs, HC_HW_MODE_CTRL, hwmode);
  78         isp1760_write32(isp->regs, HC_HW_MODE_CTRL, hwmode);
  79
  80         /*
  81          * PORT 1 Control register of the ISP1760 is the OTG control register
  82          * on ISP1761.
  83          *
  84          * TODO: Really support OTG. For now we configure port 1 in device mode
  85          * when OTG is requested.
  86          */
  87         if ((isp->devflags & ISP1760_FLAG_ISP1761) &&
  88             (isp->devflags & ISP1760_FLAG_OTG_EN))
  89                 otgctrl = ((HW_DM_PULLDOWN | HW_DP_PULLDOWN) << 16)
  90                         | HW_OTG_DISABLE;
  91         else
  92                 otgctrl = (HW_SW_SEL_HC_DC << 16)
  93                         | (HW_VBUS_DRV | HW_SEL_CP_EXT);
  94
  95         isp1760_write32(isp->regs, HC_PORT1_CTRL, otgctrl);
  96
  97         dev_info(isp->dev, "bus width: %u, oc: %s\n",
  98                  isp->devflags & ISP1760_FLAG_BUS_WIDTH_16 ? 16 : 32,
  99                  isp->devflags & ISP1760_FLAG_ANALOG_OC ? "analog" : "digital");
 100 }
 101
 102 void isp1760_set_pullup(struct isp1760_device *isp, bool enable)
 103 {
 104         isp1760_write32(isp->regs, HW_OTG_CTRL_SET,
 105                         enable ? HW_DP_PULLUP : HW_DP_PULLUP << 16);
 106 }
 107
 108 int isp1760_register(struct resource *mem, int irq, unsigned long irqflags,
 109                      struct device *dev, unsigned int devflags)
 110 {
 111         struct isp1760_device *isp;
 112         bool udc_disabled = !(devflags & ISP1760_FLAG_ISP1761);
 113         int ret;
 114
 115         /*
 116          * If neither the HCD not the UDC is enabled return an error, as no
 117          * device would be registered.
 118          */
 119         if ((!IS_ENABLED(CONFIG_USB_ISP1760_HCD) || usb_disabled()) &&
 120             (!IS_ENABLED(CONFIG_USB_ISP1761_UDC) || udc_disabled))
 121                 return -ENODEV;
 122
 123         /* prevent usb-core allocating DMA pages */
 124         dev->dma_mask = NULL;
 125
 126         isp = devm_kzalloc(dev, sizeof(*isp), GFP_KERNEL);
 127         if (!isp)
 128                 return -ENOMEM;
 129
 130         isp->dev = dev;
 131         isp->devflags = devflags;
 132
 133         isp->rst_gpio = devm_gpiod_get_optional(dev, NULL, GPIOD_OUT_HIGH);
 134         if (IS_ERR(isp->rst_gpio))
 135                 return PTR_ERR(isp->rst_gpio);
 136
 137         isp->regs = devm_ioremap_resource(dev, mem);
 138         if (IS_ERR(isp->regs))
 139                 return PTR_ERR(isp->regs);
 140
 141         isp1760_init_core(isp);
 142
 143         if (IS_ENABLED(CONFIG_USB_ISP1760_HCD) && !usb_disabled()) {
 144                 ret = isp1760_hcd_register(&isp->hcd, isp->regs, mem, irq,
 145                                            irqflags | IRQF_SHARED, dev);
 146                 if (ret < 0)
 147                         return ret;
 148         }
 149
 150         if (IS_ENABLED(CONFIG_USB_ISP1761_UDC) && !udc_disabled) {
 151                 ret = isp1760_udc_register(isp, irq, irqflags);
 152                 if (ret < 0) {
 153                         isp1760_hcd_unregister(&isp->hcd);
 154                         return ret;
 155                 }
 156         }
 157
 158         dev_set_drvdata(dev, isp);
 159
 160         return 0;
 161 }
 162
 163 void isp1760_unregister(struct device *dev)
 164 {
 165         struct isp1760_device *isp = dev_get_drvdata(dev);
 166
 167         isp1760_udc_unregister(isp);
 168         isp1760_hcd_unregister(&isp->hcd);
 169 }
 170
 171 MODULE_DESCRIPTION("Driver for the ISP1760 USB-controller from NXP");
 172 MODULE_AUTHOR("Sebastian Siewior <bigeasy@linuxtronix.de>");
 173 MODULE_LICENSE("GPL v2");