arch/arm/mach-omap2/usb-musb.c

   1 /*
   2  * linux/arch/arm/mach-omap2/usb-musb.c
   3  *
   4  * This file will contain the board specific details for the
   5  * MENTOR USB OTG controller on OMAP3430
   6  *
   7  * Copyright (C) 2007-2008 Texas Instruments
   8  * Copyright (C) 2008 Nokia Corporation
   9  * Author: Vikram Pandita
  10  *
  11  * Generalization by:
  12  * Felipe Balbi <felipe.balbi@nokia.com>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  */
  18
  19 #include <linux/types.h>
  20 #include <linux/errno.h>
  21 #include <linux/delay.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/clk.h>
  24 #include <linux/dma-mapping.h>
  25 #include <linux/io.h>
  26
  27 #include <linux/usb/musb.h>
  28
  29 #include <asm/sizes.h>
  30
  31 #include <mach/hardware.h>
  32 #include <mach/irqs.h>
  33 #include <plat/mux.h>
  34 #include <plat/usb.h>
  35
  36 #define OTG_SYSCONFIG      0x404
  37 #define OTG_SYSC_SOFTRESET BIT(1)
  38 #define OTG_SYSSTATUS     0x408
  39 #define OTG_SYSS_RESETDONE BIT(0)
  40
  41 static struct platform_device dummy_pdev = {
  42         .dev = {
  43                 .bus = &platform_bus_type,
  44         },
  45 };
  46
  47 static void __init usb_musb_pm_init(void)
  48 {
  49         void __iomem *otg_base;
  50         struct clk *otg_clk;
  51         struct device *dev = &dummy_pdev.dev;
  52
  53         if (!cpu_is_omap34xx())
  54                 return;
  55
  56         otg_base = ioremap(OMAP34XX_HSUSB_OTG_BASE, SZ_4K);
  57         if (WARN_ON(!otg_base))
  58                 return;
  59
  60         dev_set_name(dev, "musb_hdrc");
  61         otg_clk = clk_get(dev, "ick");
  62
  63         if (otg_clk && clk_enable(otg_clk)) {
  64                 printk(KERN_WARNING
  65                         "%s: Unable to enable clocks for MUSB, "
  66                         "cannot reset.\n",  __func__);
  67         } else {
  68                 /* Reset OTG controller. After reset, it will be in
  69                  * force-idle, force-standby mode. */
  70                 __raw_writel(OTG_SYSC_SOFTRESET, otg_base + OTG_SYSCONFIG);
  71
  72                 while (!(OTG_SYSS_RESETDONE &
  73                                         __raw_readl(otg_base + OTG_SYSSTATUS)))
  74                         cpu_relax();
  75         }
  76
  77         if (otg_clk) {
  78                 clk_disable(otg_clk);
  79                 clk_put(otg_clk);
  80         }
  81
  82         iounmap(otg_base);
  83 }
  84
  85 #ifdef CONFIG_USB_MUSB_SOC
  86
  87 static struct resource musb_resources[] = {
  88         [0] = { /* start and end set dynamically */
  89                 .flags  = IORESOURCE_MEM,
  90         },
  91         [1] = { /* general IRQ */
  92                 .start  = INT_243X_HS_USB_MC,
  93                 .flags  = IORESOURCE_IRQ,
  94         },
  95         [2] = { /* DMA IRQ */
  96                 .start  = INT_243X_HS_USB_DMA,
  97                 .flags  = IORESOURCE_IRQ,
  98         },
  99 };
 100
 101 static int clk_on;
 102
 103 static int musb_set_clock(struct clk *clk, int state)
 104 {
 105         if (state) {
 106                 if (clk_on > 0)
 107                         return -ENODEV;
 108
 109                 clk_enable(clk);
 110                 clk_on = 1;
 111         } else {
 112                 if (clk_on == 0)
 113                         return -ENODEV;
 114
 115                 clk_disable(clk);
 116                 clk_on = 0;
 117         }
 118
 119         return 0;
 120 }
 121
 122 static struct musb_hdrc_eps_bits musb_eps[] = {
 123         {       "ep1_tx", 10,   },
 124         {       "ep1_rx", 10,   },
 125         {       "ep2_tx", 9,    },
 126         {       "ep2_rx", 9,    },
 127         {       "ep3_tx", 3,    },
 128         {       "ep3_rx", 3,    },
 129         {       "ep4_tx", 3,    },
 130         {       "ep4_rx", 3,    },
 131         {       "ep5_tx", 3,    },
 132         {       "ep5_rx", 3,    },
 133         {       "ep6_tx", 3,    },
 134         {       "ep6_rx", 3,    },
 135         {       "ep7_tx", 3,    },
 136         {       "ep7_rx", 3,    },
 137         {       "ep8_tx", 2,    },
 138         {       "ep8_rx", 2,    },
 139         {       "ep9_tx", 2,    },
 140         {       "ep9_rx", 2,    },
 141         {       "ep10_tx", 2,   },
 142         {       "ep10_rx", 2,   },
 143         {       "ep11_tx", 2,   },
 144         {       "ep11_rx", 2,   },
 145         {       "ep12_tx", 2,   },
 146         {       "ep12_rx", 2,   },
 147         {       "ep13_tx", 2,   },
 148         {       "ep13_rx", 2,   },
 149         {       "ep14_tx", 2,   },
 150         {       "ep14_rx", 2,   },
 151         {       "ep15_tx", 2,   },
 152         {       "ep15_rx", 2,   },
 153 };
 154
 155 static struct musb_hdrc_config musb_config = {
 156         .multipoint     = 1,
 157         .dyn_fifo       = 1,
 158         .soft_con       = 1,
 159         .dma            = 1,
 160         .num_eps        = 16,
 161         .dma_channels   = 7,
 162         .dma_req_chan   = (1 << 0) | (1 << 1) | (1 << 2) | (1 << 3),
 163         .ram_bits       = 12,
 164         .eps_bits       = musb_eps,
 165 };
 166
 167 static struct musb_hdrc_platform_data musb_plat = {
 168 #ifdef CONFIG_USB_MUSB_OTG
 169         .mode           = MUSB_OTG,
 170 #elif defined(CONFIG_USB_MUSB_HDRC_HCD)
 171         .mode           = MUSB_HOST,
 172 #elif defined(CONFIG_USB_GADGET_MUSB_HDRC)
 173         .mode           = MUSB_PERIPHERAL,
 174 #endif
 175         /* .clock is set dynamically */
 176         .set_clock      = musb_set_clock,
 177         .config         = &musb_config,
 178
 179         /* REVISIT charge pump on TWL4030 can supply up to
 180          * 100 mA ... but this value is board-specific, like
 181          * "mode", and should be passed to usb_musb_init().
 182          */
 183         .power          = 50,                   /* up to 100 mA */
 184 };
 185
 186 static u64 musb_dmamask = DMA_BIT_MASK(32);
 187
 188 static struct platform_device musb_device = {
 189         .name           = "musb_hdrc",
 190         .id             = -1,
 191         .dev = {
 192                 .dma_mask               = &musb_dmamask,
 193                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 194                 .platform_data          = &musb_plat,
 195         },
 196         .num_resources  = ARRAY_SIZE(musb_resources),
 197         .resource       = musb_resources,
 198 };
 199
 200 void __init usb_musb_init(void)
 201 {
 202         if (cpu_is_omap243x())
 203                 musb_resources[0].start = OMAP243X_HS_BASE;
 204         else
 205                 musb_resources[0].start = OMAP34XX_HSUSB_OTG_BASE;
 206         musb_resources[0].end = musb_resources[0].start + SZ_8K - 1;
 207
 208         /*
 209          * REVISIT: This line can be removed once all the platforms using
 210          * musb_core.c have been converted to use use clkdev.
 211          */
 212         musb_plat.clock = "ick";
 213
 214         if (platform_device_register(&musb_device) < 0) {
 215                 printk(KERN_ERR "Unable to register HS-USB (MUSB) device\n");
 216                 return;
 217         }
 218
 219         usb_musb_pm_init();
 220 }
 221
 222 #else
 223 void __init usb_musb_init(void)
 224 {
 225         usb_musb_pm_init();
 226 }
 227 #endif /* CONFIG_USB_MUSB_SOC */