sys/arm/ti/omap4/pandaboard/pandaboard.c

   1 /*-
   2  * Copyright (c) 2011
   3  *      Ben Gray <ben.r.gray@gmail.com>.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the company nor the name of the author may be used to
  15  *    endorse or promote products derived from this software without specific
  16  *    prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY BEN GRAY ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL BEN GRAY BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  24  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  25  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  27  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33 #include <sys/systm.h>
  34 #include <sys/bus.h>
  35 #include <sys/kernel.h>
  36
  37 #include <vm/vm.h>
  38 #include <vm/pmap.h>
  39
  40 #include <machine/bus.h>
  41 #include <machine/pte.h>
  42 #include <machine/pmap.h>
  43 #include <machine/vmparam.h>
  44 #include <machine/fdt.h>
  45
  46 #include <arm/ti/omap4/omap4var.h>
  47 #include <arm/ti/omap4/omap4_reg.h>
  48
  49 /* Registers in the SCRM that control the AUX clocks */
  50 #define SCRM_ALTCLKSRC                       (0x110)
  51 #define SCRM_AUXCLK0                         (0x0310)
  52 #define SCRM_AUXCLK1                         (0x0314)
  53 #define SCRM_AUXCLK2                         (0x0318)
  54 #define SCRM_AUXCLK3                         (0x031C)
  55
  56 /* Some of the GPIO register set */
  57 #define GPIO1_OE                             (0x0134)
  58 #define GPIO1_CLEARDATAOUT                   (0x0190)
  59 #define GPIO1_SETDATAOUT                     (0x0194)
  60 #define GPIO2_OE                             (0x0134)
  61 #define GPIO2_CLEARDATAOUT                   (0x0190)
  62 #define GPIO2_SETDATAOUT                     (0x0194)
  63
  64 /* Some of the PADCONF register set */
  65 #define CONTROL_WKUP_PAD0_FREF_CLK3_OUT  (0x058)
  66 #define CONTROL_CORE_PAD1_KPD_COL2       (0x186)
  67 #define CONTROL_CORE_PAD0_GPMC_WAIT1     (0x08C)
  68
  69 #define REG_WRITE32(r, x)    *((volatile uint32_t*)(r)) = (uint32_t)(x)
  70 #define REG_READ32(r)        *((volatile uint32_t*)(r))
  71
  72 #define REG_WRITE16(r, x)    *((volatile uint16_t*)(r)) = (uint16_t)(x)
  73 #define REG_READ16(r)        *((volatile uint16_t*)(r))
  74
  75 /**
  76  *      usb_hub_init - initialises and resets the external USB hub
  77  *
  78  *      The USB hub needs to be held in reset while the power is being applied
  79  *      and the reference clock is enabled at 19.2MHz.  The following is the
  80  *      layout of the USB hub taken from the Pandaboard reference manual.
  81  *
  82  *
  83  *         .-------------.         .--------------.         .----------------.
  84  *         |  OMAP4430   |         |   USB3320C   |         |    LAN9514     |
  85  *         |             |         |              |         | USB Hub / Eth  |
  86  *         |         CLK | <------ | CLKOUT       |         |                |
  87  *         |         STP | ------> | STP          |         |                |
  88  *         |         DIR | <------ | DIR          |         |                |
  89  *         |         NXT | <------ | NXT          |         |                |
  90  *         |        DAT0 | <-----> | DAT0         |         |                |
  91  *         |        DAT1 | <-----> | DAT1      DP | <-----> | DP             |
  92  *         |        DAT2 | <-----> | DAT2      DM | <-----> | DM             |
  93  *         |        DAT3 | <-----> | DAT3         |         |                |
  94  *         |        DAT4 | <-----> | DAT4         |         |                |
  95  *         |        DAT5 | <-----> | DAT5         |  +----> | N_RESET        |
  96  *         |        DAT6 | <-----> | DAT6         |  |      |                |
  97  *         |        DAT7 | <-----> | DAT7         |  |      |                |
  98  *         |             |         |              |  |  +-> | VDD33IO        |
  99  *         |    AUX_CLK3 | ------> | REFCLK       |  |  +-> | VDD33A         |
 100  *         |             |         |              |  |  |   |                |
 101  *         |     GPIO_62 | --+---> | RESET        |  |  |   |                |
 102  *         |             |   |     |              |  |  |   |                |
 103  *         |             |   |     '--------------'  |  |   '----------------'
 104  *         |             |   |     .--------------.  |  |
 105  *         |             |   '---->| VOLT CONVERT |--'  |
 106  *         |             |         '--------------'     |
 107  *         |             |                              |
 108  *         |             |         .--------------.     |
 109  *         |      GPIO_1 | ------> |   TPS73633   |-----'
 110  *         |             |         '--------------'
 111  *         '-------------'
 112  *
 113  *
 114  *      RETURNS:
 115  *      nothing.
 116  */
 117 static void
 118 usb_hub_init(void)
 119 {
 120         bus_space_handle_t scrm_addr, gpio1_addr, gpio2_addr, scm_addr;
 121
 122         if (bus_space_map(fdtbus_bs_tag, OMAP44XX_SCRM_HWBASE,
 123             OMAP44XX_SCRM_SIZE, 0, &scrm_addr) != 0)
 124                 panic("Couldn't map SCRM registers");
 125         if (bus_space_map(fdtbus_bs_tag, OMAP44XX_GPIO1_HWBASE,
 126             OMAP44XX_GPIO1_SIZE, 0, &gpio1_addr) != 0)
 127                 panic("Couldn't map GPIO1 registers");
 128         if (bus_space_map(fdtbus_bs_tag, OMAP44XX_GPIO2_HWBASE,
 129             OMAP44XX_GPIO2_SIZE, 0, &gpio2_addr) != 0)
 130                 panic("Couldn't map GPIO2 registers");
 131         if (bus_space_map(fdtbus_bs_tag, OMAP44XX_SCM_PADCONF_HWBASE,
 132             OMAP44XX_SCM_PADCONF_SIZE, 0, &scm_addr) != 0)
 133                 panic("Couldn't map SCM Padconf registers");
 134
 135
 136
 137         /* Need to set FREF_CLK3_OUT to 19.2 MHz and pump it out on pin GPIO_WK31.
 138          * We know the SYS_CLK is 38.4Mhz and therefore to get the needed 19.2Mhz,
 139          * just use a 2x divider and ensure the SYS_CLK is used as the source.
 140          */
 141         REG_WRITE32(scrm_addr + SCRM_AUXCLK3, (1 << 16) |    /* Divider of 2 */
 142                                   (0 << 1) |     /* Use the SYS_CLK as the source */
 143                                   (1 << 8));     /* Enable the clock */
 144
 145         /* Enable the clock out to the pin (GPIO_WK31).
 146          *   muxmode=fref_clk3_out, pullup/down=disabled, input buffer=disabled,
 147          *   wakeup=disabled.
 148          */
 149         REG_WRITE16(scm_addr + CONTROL_WKUP_PAD0_FREF_CLK3_OUT, 0x0000);
 150
 151
 152         /* Disable the power to the USB hub, drive GPIO1 low */
 153         REG_WRITE32(gpio1_addr + GPIO1_OE, REG_READ32(gpio1_addr +
 154             GPIO1_OE) & ~(1UL << 1));
 155         REG_WRITE32(gpio1_addr + GPIO1_CLEARDATAOUT, (1UL << 1));
 156         REG_WRITE16(scm_addr + CONTROL_CORE_PAD1_KPD_COL2, 0x0003);
 157
 158
 159         /* Reset the USB PHY and Hub using GPIO_62 */
 160         REG_WRITE32(gpio2_addr + GPIO2_OE,
 161             REG_READ32(gpio2_addr + GPIO2_OE) & ~(1UL << 30));
 162         REG_WRITE32(gpio2_addr + GPIO2_CLEARDATAOUT, (1UL << 30));
 163         REG_WRITE16(scm_addr + CONTROL_CORE_PAD0_GPMC_WAIT1, 0x0003);
 164         DELAY(10);
 165         REG_WRITE32(gpio2_addr + GPIO2_SETDATAOUT, (1UL << 30));
 166
 167
 168         /* Enable power to the hub (GPIO_1) */
 169         REG_WRITE32(gpio1_addr + GPIO1_SETDATAOUT, (1UL << 1));
 170         bus_space_unmap(fdtbus_bs_tag, scrm_addr, OMAP44XX_SCRM_SIZE);
 171         bus_space_unmap(fdtbus_bs_tag, gpio1_addr, OMAP44XX_GPIO1_SIZE);
 172         bus_space_unmap(fdtbus_bs_tag, gpio2_addr, OMAP44XX_GPIO2_SIZE);
 173         bus_space_unmap(fdtbus_bs_tag, scm_addr, OMAP44XX_SCM_PADCONF_SIZE);
 174 }
 175
 176 /**
 177  *      board_init - initialises the pandaboard
 178  *      @dummy: ignored
 179  *
 180  *      This function is called before any of the driver are initialised, which is
 181  *      annoying because it means we can't use the SCM, PRCM and GPIO modules which
 182  *      would really be useful.
 183  *
 184  *      So we don't have:
 185  *         - any drivers
 186  *         - no interrupts
 187  *
 188  *      What we do have:
 189  *         - virt/phys mappings from the devmap (see omap4.c)
 190  *         -
 191  *
 192  *
 193  *      So we are hamstrung without the useful drivers and we have to go back to
 194  *      direct register manupulation. Luckly we don't have to do to much, basically
 195  *      just setup the usb hub/ethernet.
 196  *
 197  */
 198 static void
 199 board_init(void *dummy)
 200 {
 201         /* Initialise the USB phy and hub */
 202         usb_hub_init();
 203
 204         /*
 205          * XXX Board identification e.g. read out from FPGA or similar should
 206          * go here
 207          */
 208 }
 209
 210 SYSINIT(board_init, SI_SUB_CPU, SI_ORDER_THIRD, board_init, NULL);