arch/mips/alchemy/devboards/pb1000/board_setup.c

   1 /*
   2  * Copyright 2000, 2008 MontaVista Software Inc.
   3  * Author: MontaVista Software, Inc. <source@mvista.com>
   4  *
   5  *  This program is free software; you can redistribute  it and/or modify it
   6  *  under  the terms of  the GNU General  Public License as published by the
   7  *  Free Software Foundation;  either version 2 of the  License, or (at your
   8  *  option) any later version.
   9  *
  10  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  11  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  12  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  13  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  14  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  15  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  16  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  17  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  18  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  19  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  20  *
  21  *  You should have received a copy of the  GNU General Public License along
  22  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  23  *  675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 #include <linux/delay.h>
  27 #include <linux/gpio.h>
  28 #include <linux/init.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/pm.h>
  31 #include <asm/mach-au1x00/au1000.h>
  32 #include <asm/mach-pb1x00/pb1000.h>
  33 #include <asm/reboot.h>
  34 #include <prom.h>
  35
  36 #include "../platform.h"
  37
  38 const char *get_system_type(void)
  39 {
  40         return "Alchemy Pb1000";
  41 }
  42
  43 static void board_reset(char *c)
  44 {
  45         asm volatile ("jr %0" : : "r" (0xbfc00000));
  46 }
  47
  48 static void board_power_off(void)
  49 {
  50         while (1)
  51                 asm volatile (
  52                 "       .set    mips32                                  \n"
  53                 "       wait                                            \n"
  54                 "       .set    mips0                                   \n");
  55 }
  56
  57 void __init board_setup(void)
  58 {
  59         u32 pin_func, static_cfg0;
  60         u32 sys_freqctrl, sys_clksrc;
  61         u32 prid = read_c0_prid();
  62
  63         sys_freqctrl = 0;
  64         sys_clksrc = 0;
  65
  66         /* Set AUX clock to 12 MHz * 8 = 96 MHz */
  67         au_writel(8, SYS_AUXPLL);
  68         alchemy_gpio1_input_enable();
  69         udelay(100);
  70
  71 #if defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
  72         /* Zero and disable FREQ2 */
  73         sys_freqctrl = au_readl(SYS_FREQCTRL0);
  74         sys_freqctrl &= ~0xFFF00000;
  75         au_writel(sys_freqctrl, SYS_FREQCTRL0);
  76
  77         /* Zero and disable USBH/USBD clocks */
  78         sys_clksrc = au_readl(SYS_CLKSRC);
  79         sys_clksrc &= ~(SYS_CS_CUD | SYS_CS_DUD | SYS_CS_MUD_MASK |
  80                         SYS_CS_CUH | SYS_CS_DUH | SYS_CS_MUH_MASK);
  81         au_writel(sys_clksrc, SYS_CLKSRC);
  82
  83         sys_freqctrl = au_readl(SYS_FREQCTRL0);
  84         sys_freqctrl &= ~0xFFF00000;
  85
  86         sys_clksrc = au_readl(SYS_CLKSRC);
  87         sys_clksrc &= ~(SYS_CS_CUD | SYS_CS_DUD | SYS_CS_MUD_MASK |
  88                         SYS_CS_CUH | SYS_CS_DUH | SYS_CS_MUH_MASK);
  89
  90         switch (prid & 0x000000FF) {
  91         case 0x00: /* DA */
  92         case 0x01: /* HA */
  93         case 0x02: /* HB */
  94                 /* CPU core freq to 48 MHz to slow it way down... */
  95                 au_writel(4, SYS_CPUPLL);
  96
  97                 /*
  98                  * Setup 48 MHz FREQ2 from CPUPLL for USB Host
  99                  * FRDIV2 = 3 -> div by 8 of 384 MHz -> 48 MHz
 100                  */
 101                 sys_freqctrl |= (3 << SYS_FC_FRDIV2_BIT) | SYS_FC_FE2;
 102                 au_writel(sys_freqctrl, SYS_FREQCTRL0);
 103
 104                 /* CPU core freq to 384 MHz */
 105                 au_writel(0x20, SYS_CPUPLL);
 106
 107                 printk(KERN_INFO "Au1000: 48 MHz OHCI workaround enabled\n");
 108                 break;
 109
 110         default: /* HC and newer */
 111                 /* FREQ2 = aux / 2 = 48 MHz */
 112                 sys_freqctrl |= (0 << SYS_FC_FRDIV2_BIT) |
 113                                  SYS_FC_FE2 | SYS_FC_FS2;
 114                 au_writel(sys_freqctrl, SYS_FREQCTRL0);
 115                 break;
 116         }
 117
 118         /*
 119          * Route 48 MHz FREQ2 into USB Host and/or Device
 120          */
 121         sys_clksrc |= SYS_CS_MUX_FQ2 << SYS_CS_MUH_BIT;
 122         au_writel(sys_clksrc, SYS_CLKSRC);
 123
 124         /* Configure pins GPIO[14:9] as GPIO */
 125         pin_func = au_readl(SYS_PINFUNC) & ~(SYS_PF_UR3 | SYS_PF_USB);
 126
 127         /* 2nd USB port is USB host */
 128         pin_func |= SYS_PF_USB;
 129
 130         au_writel(pin_func, SYS_PINFUNC);
 131
 132         alchemy_gpio_direction_input(11);
 133         alchemy_gpio_direction_input(13);
 134         alchemy_gpio_direction_output(4, 0);
 135         alchemy_gpio_direction_output(5, 0);
 136 #endif /* defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE) */
 137
 138         /* Make GPIO 15 an input (for interrupt line) */
 139         pin_func = au_readl(SYS_PINFUNC) & ~SYS_PF_IRF;
 140         /* We don't need I2S, so make it available for GPIO[31:29] */
 141         pin_func |= SYS_PF_I2S;
 142         au_writel(pin_func, SYS_PINFUNC);
 143
 144         alchemy_gpio_direction_input(15);
 145
 146         static_cfg0 = au_readl(MEM_STCFG0) & ~0xc00;
 147         au_writel(static_cfg0, MEM_STCFG0);
 148
 149         /* configure RCE2* for LCD */
 150         au_writel(0x00000004, MEM_STCFG2);
 151
 152         /* MEM_STTIME2 */
 153         au_writel(0x09000000, MEM_STTIME2);
 154
 155         /* Set 32-bit base address decoding for RCE2* */
 156         au_writel(0x10003ff0, MEM_STADDR2);
 157
 158         /*
 159          * PCI CPLD setup
 160          * Expand CE0 to cover PCI
 161          */
 162         au_writel(0x11803e40, MEM_STADDR1);
 163
 164         /* Burst visibility on */
 165         au_writel(au_readl(MEM_STCFG0) | 0x1000, MEM_STCFG0);
 166
 167         au_writel(0x83, MEM_STCFG1);         /* ewait enabled, flash timing */
 168         au_writel(0x33030a10, MEM_STTIME1);  /* slower timing for FPGA */
 169
 170         /* Setup the static bus controller */
 171         au_writel(0x00000002, MEM_STCFG3);  /* type = PCMCIA */
 172         au_writel(0x280E3D07, MEM_STTIME3); /* 250ns cycle time */
 173         au_writel(0x10000000, MEM_STADDR3); /* any PCMCIA select */
 174
 175         /*
 176          * Enable Au1000 BCLK switching - note: sed1356 must not use
 177          * its BCLK (Au1000 LCLK) for any timings
 178          */
 179         switch (prid & 0x000000FF) {
 180         case 0x00: /* DA */
 181         case 0x01: /* HA */
 182         case 0x02: /* HB */
 183                 break;
 184         default:  /* HC and newer */
 185                 /*
 186                  * Enable sys bus clock divider when IDLE state or no bus
 187                  * activity.
 188                  */
 189                 au_writel(au_readl(SYS_POWERCTRL) | (0x3 << 5), SYS_POWERCTRL);
 190                 break;
 191         }
 192
 193         pm_power_off = board_power_off;
 194         _machine_halt = board_power_off;
 195         _machine_restart = board_reset;
 196 }
 197
 198 static int __init pb1000_init_irq(void)
 199 {
 200         irq_set_irq_type(AU1000_GPIO15_INT, IRQF_TRIGGER_LOW);
 201         return 0;
 202 }
 203 arch_initcall(pb1000_init_irq);
 204
 205 static int __init pb1000_device_init(void)
 206 {
 207         return db1x_register_norflash(8 * 1024 * 1024, 4, 0);
 208 }
 209 device_initcall(pb1000_device_init);