drivers/usb/musb/omap2430.c

   1 /*
   2  * Copyright (C) 2005-2007 by Texas Instruments
   3  * Some code has been taken from tusb6010.c
   4  * Copyrights for that are attributable to:
   5  * Copyright (C) 2006 Nokia Corporation
   6  * Tony Lindgren <tony@atomide.com>
   7  *
   8  * This file is part of the Inventra Controller Driver for Linux.
   9  *
  10  * The Inventra Controller Driver for Linux is free software; you
  11  * can redistribute it and/or modify it under the terms of the GNU
  12  * General Public License version 2 as published by the Free Software
  13  * Foundation.
  14  *
  15  * The Inventra Controller Driver for Linux is distributed in
  16  * the hope that it will be useful, but WITHOUT ANY WARRANTY;
  17  * without even the implied warranty of MERCHANTABILITY or
  18  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  19  * License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with The Inventra Controller Driver for Linux ; if not,
  23  * write to the Free Software Foundation, Inc., 59 Temple Place,
  24  * Suite 330, Boston, MA  02111-1307  USA
  25  *
  26  */
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/sched.h>
  30 #include <linux/slab.h>
  31 #include <linux/init.h>
  32 #include <linux/list.h>
  33 #include <linux/clk.h>
  34 #include <linux/io.h>
  35
  36 #include <asm/mach-types.h>
  37 #include <mach/hardware.h>
  38 #include <plat/mux.h>
  39
  40 #include "musb_core.h"
  41 #include "omap2430.h"
  42
  43 #ifdef CONFIG_ARCH_OMAP3430
  44 #define get_cpu_rev()   2
  45 #endif
  46
  47
  48 static struct timer_list musb_idle_timer;
  49
  50 static void musb_do_idle(unsigned long _musb)
  51 {
  52         struct musb     *musb = (void *)_musb;
  53         unsigned long   flags;
  54 #ifdef CONFIG_USB_MUSB_HDRC_HCD
  55         u8      power;
  56 #endif
  57         u8      devctl;
  58
  59         spin_lock_irqsave(&musb->lock, flags);
  60
  61         devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
  62
  63         switch (musb->xceiv->state) {
  64         case OTG_STATE_A_WAIT_BCON:
  65                 devctl &= ~MUSB_DEVCTL_SESSION;
  66                 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
  67
  68                 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
  69                 if (devctl & MUSB_DEVCTL_BDEVICE) {
  70                         musb->xceiv->state = OTG_STATE_B_IDLE;
  71                         MUSB_DEV_MODE(musb);
  72                 } else {
  73                         musb->xceiv->state = OTG_STATE_A_IDLE;
  74                         MUSB_HST_MODE(musb);
  75                 }
  76                 break;
  77 #ifdef CONFIG_USB_MUSB_HDRC_HCD
  78         case OTG_STATE_A_SUSPEND:
  79                 /* finish RESUME signaling? */
  80                 if (musb->port1_status & MUSB_PORT_STAT_RESUME) {
  81                         power = musb_readb(musb->mregs, MUSB_POWER);
  82                         power &= ~MUSB_POWER_RESUME;
  83                         DBG(1, "root port resume stopped, power %02x\n", power);
  84                         musb_writeb(musb->mregs, MUSB_POWER, power);
  85                         musb->is_active = 1;
  86                         musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
  87                                                 | MUSB_PORT_STAT_RESUME);
  88                         musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
  89                         usb_hcd_poll_rh_status(musb_to_hcd(musb));
  90                         /* NOTE: it might really be A_WAIT_BCON ... */
  91                         musb->xceiv->state = OTG_STATE_A_HOST;
  92                 }
  93                 break;
  94 #endif
  95 #ifdef CONFIG_USB_MUSB_HDRC_HCD
  96         case OTG_STATE_A_HOST:
  97                 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
  98                 if (devctl &  MUSB_DEVCTL_BDEVICE)
  99                         musb->xceiv->state = OTG_STATE_B_IDLE;
 100                 else
 101                         musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
 102 #endif
 103         default:
 104                 break;
 105         }
 106         spin_unlock_irqrestore(&musb->lock, flags);
 107 }
 108
 109
 110 void musb_platform_try_idle(struct musb *musb, unsigned long timeout)
 111 {
 112         unsigned long           default_timeout = jiffies + msecs_to_jiffies(3);
 113         static unsigned long    last_timer;
 114
 115         if (timeout == 0)
 116                 timeout = default_timeout;
 117
 118         /* Never idle if active, or when VBUS timeout is not set as host */
 119         if (musb->is_active || ((musb->a_wait_bcon == 0)
 120                         && (musb->xceiv->state == OTG_STATE_A_WAIT_BCON))) {
 121                 DBG(4, "%s active, deleting timer\n", otg_state_string(musb));
 122                 del_timer(&musb_idle_timer);
 123                 last_timer = jiffies;
 124                 return;
 125         }
 126
 127         if (time_after(last_timer, timeout)) {
 128                 if (!timer_pending(&musb_idle_timer))
 129                         last_timer = timeout;
 130                 else {
 131                         DBG(4, "Longer idle timer already pending, ignoring\n");
 132                         return;
 133                 }
 134         }
 135         last_timer = timeout;
 136
 137         DBG(4, "%s inactive, for idle timer for %lu ms\n",
 138                 otg_state_string(musb),
 139                 (unsigned long)jiffies_to_msecs(timeout - jiffies));
 140         mod_timer(&musb_idle_timer, timeout);
 141 }
 142
 143 void musb_platform_enable(struct musb *musb)
 144 {
 145 }
 146 void musb_platform_disable(struct musb *musb)
 147 {
 148 }
 149 static void omap_vbus_power(struct musb *musb, int is_on, int sleeping)
 150 {
 151 }
 152
 153 static void omap_set_vbus(struct musb *musb, int is_on)
 154 {
 155         u8              devctl;
 156         /* HDRC controls CPEN, but beware current surges during device
 157          * connect.  They can trigger transient overcurrent conditions
 158          * that must be ignored.
 159          */
 160
 161         devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
 162
 163         if (is_on) {
 164                 musb->is_active = 1;
 165                 musb->xceiv->default_a = 1;
 166                 musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
 167                 devctl |= MUSB_DEVCTL_SESSION;
 168
 169                 MUSB_HST_MODE(musb);
 170         } else {
 171                 musb->is_active = 0;
 172
 173                 /* NOTE:  we're skipping A_WAIT_VFALL -> A_IDLE and
 174                  * jumping right to B_IDLE...
 175                  */
 176
 177                 musb->xceiv->default_a = 0;
 178                 musb->xceiv->state = OTG_STATE_B_IDLE;
 179                 devctl &= ~MUSB_DEVCTL_SESSION;
 180
 181                 MUSB_DEV_MODE(musb);
 182         }
 183         musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 184
 185         DBG(1, "VBUS %s, devctl %02x "
 186                 /* otg %3x conf %08x prcm %08x */ "\n",
 187                 otg_state_string(musb),
 188                 musb_readb(musb->mregs, MUSB_DEVCTL));
 189 }
 190
 191 static int musb_platform_resume(struct musb *musb);
 192
 193 int musb_platform_set_mode(struct musb *musb, u8 musb_mode)
 194 {
 195         u8      devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
 196
 197         devctl |= MUSB_DEVCTL_SESSION;
 198         musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 199
 200         return 0;
 201 }
 202
 203 int __init musb_platform_init(struct musb *musb)
 204 {
 205         u32 l;
 206
 207 #if defined(CONFIG_ARCH_OMAP2430)
 208         omap_cfg_reg(AE5_2430_USB0HS_STP);
 209 #endif
 210
 211         /* We require some kind of external transceiver, hooked
 212          * up through ULPI.  TWL4030-family PMICs include one,
 213          * which needs a driver, drivers aren't always needed.
 214          */
 215         musb->xceiv = otg_get_transceiver();
 216         if (!musb->xceiv) {
 217                 pr_err("HS USB OTG: no transceiver configured\n");
 218                 return -ENODEV;
 219         }
 220
 221         musb_platform_resume(musb);
 222
 223         l = omap_readl(OTG_SYSCONFIG);
 224         l &= ~ENABLEWAKEUP;     /* disable wakeup */
 225         l &= ~NOSTDBY;          /* remove possible nostdby */
 226         l |= SMARTSTDBY;        /* enable smart standby */
 227         l &= ~AUTOIDLE;         /* disable auto idle */
 228         l &= ~NOIDLE;           /* remove possible noidle */
 229         l |= SMARTIDLE;         /* enable smart idle */
 230         /*
 231          * MUSB AUTOIDLE don't work in 3430.
 232          * Workaround by Richard Woodruff/TI
 233          */
 234         if (!cpu_is_omap3430())
 235                 l |= AUTOIDLE;          /* enable auto idle */
 236         omap_writel(l, OTG_SYSCONFIG);
 237
 238         l = omap_readl(OTG_INTERFSEL);
 239         l |= ULPI_12PIN;
 240         omap_writel(l, OTG_INTERFSEL);
 241
 242         pr_debug("HS USB OTG: revision 0x%x, sysconfig 0x%02x, "
 243                         "sysstatus 0x%x, intrfsel 0x%x, simenable  0x%x\n",
 244                         omap_readl(OTG_REVISION), omap_readl(OTG_SYSCONFIG),
 245                         omap_readl(OTG_SYSSTATUS), omap_readl(OTG_INTERFSEL),
 246                         omap_readl(OTG_SIMENABLE));
 247
 248         omap_vbus_power(musb, musb->board_mode == MUSB_HOST, 1);
 249
 250         if (is_host_enabled(musb))
 251                 musb->board_set_vbus = omap_set_vbus;
 252
 253         setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb);
 254
 255         return 0;
 256 }
 257
 258 int musb_platform_suspend(struct musb *musb)
 259 {
 260         u32 l;
 261
 262         if (!musb->clock)
 263                 return 0;
 264
 265         /* in any role */
 266         l = omap_readl(OTG_FORCESTDBY);
 267         l |= ENABLEFORCE;       /* enable MSTANDBY */
 268         omap_writel(l, OTG_FORCESTDBY);
 269
 270         l = omap_readl(OTG_SYSCONFIG);
 271         l |= ENABLEWAKEUP;      /* enable wakeup */
 272         omap_writel(l, OTG_SYSCONFIG);
 273
 274         otg_set_suspend(musb->xceiv, 1);
 275
 276         if (musb->set_clock)
 277                 musb->set_clock(musb->clock, 0);
 278         else
 279                 clk_disable(musb->clock);
 280
 281         return 0;
 282 }
 283
 284 static int musb_platform_resume(struct musb *musb)
 285 {
 286         u32 l;
 287
 288         if (!musb->clock)
 289                 return 0;
 290
 291         otg_set_suspend(musb->xceiv, 0);
 292
 293         if (musb->set_clock)
 294                 musb->set_clock(musb->clock, 1);
 295         else
 296                 clk_enable(musb->clock);
 297
 298         l = omap_readl(OTG_SYSCONFIG);
 299         l &= ~ENABLEWAKEUP;     /* disable wakeup */
 300         omap_writel(l, OTG_SYSCONFIG);
 301
 302         l = omap_readl(OTG_FORCESTDBY);
 303         l &= ~ENABLEFORCE;      /* disable MSTANDBY */
 304         omap_writel(l, OTG_FORCESTDBY);
 305
 306         return 0;
 307 }
 308
 309
 310 int musb_platform_exit(struct musb *musb)
 311 {
 312
 313         omap_vbus_power(musb, 0 /*off*/, 1);
 314
 315         musb_platform_suspend(musb);
 316
 317         clk_put(musb->clock);
 318         musb->clock = 0;
 319
 320         return 0;
 321 }