arch/arm/mach-imx/mx31moboard-smartbot.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2009 Valentin Longchamp, EPFL Mobots group
   4  */
   5
   6 #include <linux/delay.h>
   7 #include <linux/gpio.h>
   8 #include <linux/init.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/i2c.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/types.h>
  13
  14 #include <linux/usb/otg.h>
  15 #include <linux/usb/ulpi.h>
  16
  17 #include "board-mx31moboard.h"
  18 #include "common.h"
  19 #include "devices-imx31.h"
  20 #include "ehci.h"
  21 #include "hardware.h"
  22 #include "iomux-mx3.h"
  23 #include "ulpi.h"
  24
  25 static unsigned int smartbot_pins[] = {
  26         /* UART1 */
  27         MX31_PIN_CTS2__CTS2, MX31_PIN_RTS2__RTS2,
  28         MX31_PIN_TXD2__TXD2, MX31_PIN_RXD2__RXD2,
  29         /* ENABLES */
  30         MX31_PIN_DTR_DCE1__GPIO2_8, MX31_PIN_DSR_DCE1__GPIO2_9,
  31         MX31_PIN_RI_DCE1__GPIO2_10, MX31_PIN_DCD_DCE1__GPIO2_11,
  32 };
  33
  34 static const struct imxuart_platform_data uart_pdata __initconst = {
  35         .flags = IMXUART_HAVE_RTSCTS,
  36 };
  37
  38 static const struct fsl_usb2_platform_data usb_pdata __initconst = {
  39         .operating_mode = FSL_USB2_DR_DEVICE,
  40         .phy_mode       = FSL_USB2_PHY_ULPI,
  41 };
  42
  43 #if defined(CONFIG_USB_ULPI)
  44
  45 static int smartbot_otg_init(struct platform_device *pdev)
  46 {
  47         return mx31_initialize_usb_hw(pdev->id, MXC_EHCI_POWER_PINS_ENABLED);
  48 }
  49
  50 static struct mxc_usbh_platform_data otg_host_pdata __initdata = {
  51         .init   = smartbot_otg_init,
  52         .portsc = MXC_EHCI_MODE_ULPI | MXC_EHCI_UTMI_8BIT,
  53 };
  54
  55 static int __init smartbot_otg_host_init(void)
  56 {
  57         struct platform_device *pdev;
  58
  59         otg_host_pdata.otg = imx_otg_ulpi_create(ULPI_OTG_DRVVBUS |
  60                 ULPI_OTG_DRVVBUS_EXT);
  61         if (!otg_host_pdata.otg)
  62                 return -ENODEV;
  63
  64         pdev = imx31_add_mxc_ehci_otg(&otg_host_pdata);
  65
  66         return PTR_ERR_OR_ZERO(pdev);
  67 }
  68 #else
  69 static inline int smartbot_otg_host_init(void) { return 0; }
  70 #endif
  71
  72 #define POWER_EN IOMUX_TO_GPIO(MX31_PIN_DTR_DCE1)
  73 #define DSPIC_RST_B IOMUX_TO_GPIO(MX31_PIN_DSR_DCE1)
  74 #define TRSLAT_RST_B IOMUX_TO_GPIO(MX31_PIN_RI_DCE1)
  75 #define TRSLAT_SRC_CHOICE IOMUX_TO_GPIO(MX31_PIN_DCD_DCE1)
  76
  77 static void smartbot_resets_init(void)
  78 {
  79         if (!gpio_request(POWER_EN, "power-enable")) {
  80                 gpio_direction_output(POWER_EN, 0);
  81                 gpio_export(POWER_EN, false);
  82         }
  83
  84         if (!gpio_request(DSPIC_RST_B, "dspic-rst")) {
  85                 gpio_direction_output(DSPIC_RST_B, 0);
  86                 gpio_export(DSPIC_RST_B, false);
  87         }
  88
  89         if (!gpio_request(TRSLAT_RST_B, "translator-rst")) {
  90                 gpio_direction_output(TRSLAT_RST_B, 0);
  91                 gpio_export(TRSLAT_RST_B, false);
  92         }
  93
  94         if (!gpio_request(TRSLAT_SRC_CHOICE, "translator-src-choice")) {
  95                 gpio_direction_output(TRSLAT_SRC_CHOICE, 0);
  96                 gpio_export(TRSLAT_SRC_CHOICE, false);
  97         }
  98 }
  99 /*
 100  * system init for baseboard usage. Will be called by mx31moboard init.
 101  */
 102 void __init mx31moboard_smartbot_init(int board)
 103 {
 104         printk(KERN_INFO "Initializing mx31smartbot peripherals\n");
 105
 106         mxc_iomux_setup_multiple_pins(smartbot_pins, ARRAY_SIZE(smartbot_pins),
 107                 "smartbot");
 108
 109         imx31_add_imx_uart1(&uart_pdata);
 110
 111         switch (board) {
 112         case MX31SMARTBOT:
 113                 imx31_add_fsl_usb2_udc(&usb_pdata);
 114                 break;
 115         case MX31EYEBOT:
 116                 smartbot_otg_host_init();
 117                 break;
 118         default:
 119                 printk(KERN_WARNING "Unknown board %d, USB OTG not initialized",
 120                         board);
 121         }
 122
 123         smartbot_resets_init();
 124 }