arch/arm/plat-omap/usb.c

   1  /*
   2  * arch/arm/plat-omap/usb.c -- platform level USB initialization
   3  *
   4  * Copyright (C) 2004 Texas Instruments, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #undef  DEBUG
  22
  23 #include <linux/module.h>
  24 #include <linux/kernel.h>
  25 #include <linux/init.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/io.h>
  28
  29 #include <plat/usb.h>
  30 #include <plat/board.h>
  31
  32 #ifdef  CONFIG_ARCH_OMAP_OTG
  33
  34 void __init
  35 omap_otg_init(struct omap_usb_config *config)
  36 {
  37         u32             syscon;
  38         int             status;
  39         int             alt_pingroup = 0;
  40
  41         /* NOTE:  no bus or clock setup (yet?) */
  42
  43         syscon = omap_readl(OTG_SYSCON_1) & 0xffff;
  44         if (!(syscon & OTG_RESET_DONE))
  45                 pr_debug("USB resets not complete?\n");
  46
  47         //omap_writew(0, OTG_IRQ_EN);
  48
  49         /* pin muxing and transceiver pinouts */
  50         if (config->pins[0] > 2)        /* alt pingroup 2 */
  51                 alt_pingroup = 1;
  52         syscon |= config->usb0_init(config->pins[0], is_usb0_device(config));
  53         syscon |= config->usb1_init(config->pins[1]);
  54         syscon |= config->usb2_init(config->pins[2], alt_pingroup);
  55         pr_debug("OTG_SYSCON_1 = %08x\n", omap_readl(OTG_SYSCON_1));
  56         omap_writel(syscon, OTG_SYSCON_1);
  57
  58         syscon = config->hmc_mode;
  59         syscon |= USBX_SYNCHRO | (4 << 16) /* B_ASE0_BRST */;
  60 #ifdef  CONFIG_USB_OTG
  61         if (config->otg)
  62                 syscon |= OTG_EN;
  63 #endif
  64         if (cpu_class_is_omap1())
  65                 pr_debug("USB_TRANSCEIVER_CTRL = %03x\n",
  66                          omap_readl(USB_TRANSCEIVER_CTRL));
  67         pr_debug("OTG_SYSCON_2 = %08x\n", omap_readl(OTG_SYSCON_2));
  68         omap_writel(syscon, OTG_SYSCON_2);
  69
  70         printk("USB: hmc %d", config->hmc_mode);
  71         if (!alt_pingroup)
  72                 printk(", usb2 alt %d wires", config->pins[2]);
  73         else if (config->pins[0])
  74                 printk(", usb0 %d wires%s", config->pins[0],
  75                         is_usb0_device(config) ? " (dev)" : "");
  76         if (config->pins[1])
  77                 printk(", usb1 %d wires", config->pins[1]);
  78         if (!alt_pingroup && config->pins[2])
  79                 printk(", usb2 %d wires", config->pins[2]);
  80         if (config->otg)
  81                 printk(", Mini-AB on usb%d", config->otg - 1);
  82         printk("\n");
  83
  84         if (cpu_class_is_omap1()) {
  85                 u16 w;
  86
  87                 /* leave USB clocks/controllers off until needed */
  88                 w = omap_readw(ULPD_SOFT_REQ);
  89                 w &= ~SOFT_USB_CLK_REQ;
  90                 omap_writew(w, ULPD_SOFT_REQ);
  91
  92                 w = omap_readw(ULPD_CLOCK_CTRL);
  93                 w &= ~USB_MCLK_EN;
  94                 w |= DIS_USB_PVCI_CLK;
  95                 omap_writew(w, ULPD_CLOCK_CTRL);
  96         }
  97         syscon = omap_readl(OTG_SYSCON_1);
  98         syscon |= HST_IDLE_EN|DEV_IDLE_EN|OTG_IDLE_EN;
  99
 100 #ifdef  CONFIG_USB_GADGET_OMAP
 101         if (config->otg || config->register_dev) {
 102                 struct platform_device *udc_device = config->udc_device;
 103
 104                 syscon &= ~DEV_IDLE_EN;
 105                 udc_device->dev.platform_data = config;
 106                 status = platform_device_register(udc_device);
 107                 if (status)
 108                         pr_debug("can't register UDC device, %d\n", status);
 109         }
 110 #endif
 111
 112 #if     defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
 113         if (config->otg || config->register_host) {
 114                 struct platform_device *ohci_device = config->ohci_device;
 115
 116                 syscon &= ~HST_IDLE_EN;
 117                 ohci_device->dev.platform_data = config;
 118                 status = platform_device_register(ohci_device);
 119                 if (status)
 120                         pr_debug("can't register OHCI device, %d\n", status);
 121         }
 122 #endif
 123
 124 #ifdef  CONFIG_USB_OTG
 125         if (config->otg) {
 126                 struct platform_device *otg_device = config->otg_device;
 127
 128                 syscon &= ~OTG_IDLE_EN;
 129                 otg_device->dev.platform_data = config;
 130                 status = platform_device_register(otg_device);
 131                 if (status)
 132                         pr_debug("can't register OTG device, %d\n", status);
 133         }
 134 #endif
 135         pr_debug("OTG_SYSCON_1 = %08x\n", omap_readl(OTG_SYSCON_1));
 136         omap_writel(syscon, OTG_SYSCON_1);
 137
 138         status = 0;
 139 }
 140
 141 #else
 142 void omap_otg_init(struct omap_usb_config *config) {}
 143 #endif