arch/powerpc/platforms/52xx/lite5200.c

   1 /*
   2  * Freescale Lite5200 board support
   3  *
   4  * Written by: Grant Likely <grant.likely@secretlab.ca>
   5  *
   6  * Copyright (C) Secret Lab Technologies Ltd. 2006. All rights reserved.
   7  * Copyright (C) Freescale Semicondutor, Inc. 2006. All rights reserved.
   8  *
   9  * Description:
  10  * This program is free software; you can redistribute  it and/or modify it
  11  * under  the terms of  the GNU General  Public License as published by the
  12  * Free Software Foundation;  either version 2 of the  License, or (at your
  13  * option) any later version.
  14  */
  15
  16 #undef DEBUG
  17
  18 #include <linux/init.h>
  19 #include <linux/pci.h>
  20 #include <linux/of.h>
  21 #include <linux/root_dev.h>
  22 #include <linux/initrd.h>
  23 #include <asm/time.h>
  24 #include <asm/io.h>
  25 #include <asm/machdep.h>
  26 #include <asm/prom.h>
  27 #include <asm/mpc52xx.h>
  28
  29 /* ************************************************************************
  30  *
  31  * Setup the architecture
  32  *
  33  */
  34
  35 /* mpc5200 device tree match tables */
  36 static struct of_device_id mpc5200_cdm_ids[] __initdata = {
  37         { .compatible = "fsl,mpc5200-cdm", },
  38         { .compatible = "mpc5200-cdm", },
  39         {}
  40 };
  41
  42 static struct of_device_id mpc5200_gpio_ids[] __initdata = {
  43         { .compatible = "fsl,mpc5200-gpio", },
  44         { .compatible = "mpc5200-gpio", },
  45         {}
  46 };
  47
  48 /*
  49  * Fix clock configuration.
  50  *
  51  * Firmware is supposed to be responsible for this.  If you are creating a
  52  * new board port, do *NOT* duplicate this code.  Fix your boot firmware
  53  * to set it correctly in the first place
  54  */
  55 static void __init
  56 lite5200_fix_clock_config(void)
  57 {
  58         struct device_node *np;
  59         struct mpc52xx_cdm  __iomem *cdm;
  60         /* Map zones */
  61         np = of_find_matching_node(NULL, mpc5200_cdm_ids);
  62         cdm = of_iomap(np, 0);
  63         of_node_put(np);
  64         if (!cdm) {
  65                 printk(KERN_ERR "%s() failed; expect abnormal behaviour\n",
  66                        __FUNCTION__);
  67                 return;
  68         }
  69
  70         /* Use internal 48 Mhz */
  71         out_8(&cdm->ext_48mhz_en, 0x00);
  72         out_8(&cdm->fd_enable, 0x01);
  73         if (in_be32(&cdm->rstcfg) & 0x40)       /* Assumes 33Mhz clock */
  74                 out_be16(&cdm->fd_counters, 0x0001);
  75         else
  76                 out_be16(&cdm->fd_counters, 0x5555);
  77
  78         /* Unmap the regs */
  79         iounmap(cdm);
  80 }
  81
  82 /*
  83  * Fix setting of port_config register.
  84  *
  85  * Firmware is supposed to be responsible for this.  If you are creating a
  86  * new board port, do *NOT* duplicate this code.  Fix your boot firmware
  87  * to set it correctly in the first place
  88  */
  89 static void __init
  90 lite5200_fix_port_config(void)
  91 {
  92         struct device_node *np;
  93         struct mpc52xx_gpio __iomem *gpio;
  94         u32 port_config;
  95
  96         np = of_find_matching_node(NULL, mpc5200_gpio_ids);
  97         gpio = of_iomap(np, 0);
  98         of_node_put(np);
  99         if (!gpio) {
 100                 printk(KERN_ERR "%s() failed. expect abnormal behavior\n",
 101                        __FUNCTION__);
 102                 return;
 103         }
 104
 105         /* Set port config */
 106         port_config = in_be32(&gpio->port_config);
 107
 108         port_config &= ~0x00800000;     /* 48Mhz internal, pin is GPIO  */
 109
 110         port_config &= ~0x00007000;     /* USB port : Differential mode */
 111         port_config |=  0x00001000;     /*            USB 1 only        */
 112
 113         port_config &= ~0x03000000;     /* ATA CS is on csb_4/5         */
 114         port_config |=  0x01000000;
 115
 116         pr_debug("port_config: old:%x new:%x\n",
 117                  in_be32(&gpio->port_config), port_config);
 118         out_be32(&gpio->port_config, port_config);
 119
 120         /* Unmap zone */
 121         iounmap(gpio);
 122 }
 123
 124 #ifdef CONFIG_PM
 125 static void lite5200_suspend_prepare(void __iomem *mbar)
 126 {
 127         u8 pin = 1;     /* GPIO_WKUP_1 (GPIO_PSC2_4) */
 128         u8 level = 0;   /* wakeup on low level */
 129         mpc52xx_set_wakeup_gpio(pin, level);
 130
 131         /*
 132          * power down usb port
 133          * this needs to be called before of-ohci suspend code
 134          */
 135
 136         /* set ports to "power switched" and "powered at the same time"
 137          * USB Rh descriptor A: NPS = 0, PSM = 0 */
 138         out_be32(mbar + 0x1048, in_be32(mbar + 0x1048) & ~0x300);
 139         /* USB Rh status: LPS = 1 - turn off power */
 140         out_be32(mbar + 0x1050, 0x00000001);
 141 }
 142
 143 static void lite5200_resume_finish(void __iomem *mbar)
 144 {
 145         /* USB Rh status: LPSC = 1 - turn on power */
 146         out_be32(mbar + 0x1050, 0x00010000);
 147 }
 148 #endif
 149
 150 static void __init lite5200_setup_arch(void)
 151 {
 152         if (ppc_md.progress)
 153                 ppc_md.progress("lite5200_setup_arch()", 0);
 154
 155         /* Map important registers from the internal memory map */
 156         mpc52xx_map_common_devices();
 157
 158         /* Some mpc5200 & mpc5200b related configuration */
 159         mpc5200_setup_xlb_arbiter();
 160
 161         /* Fix things that firmware should have done. */
 162         lite5200_fix_clock_config();
 163         lite5200_fix_port_config();
 164
 165 #ifdef CONFIG_PM
 166         mpc52xx_suspend.board_suspend_prepare = lite5200_suspend_prepare;
 167         mpc52xx_suspend.board_resume_finish = lite5200_resume_finish;
 168         lite5200_pm_init();
 169 #endif
 170
 171         mpc52xx_setup_pci();
 172 }
 173
 174 /*
 175  * Called very early, MMU is off, device-tree isn't unflattened
 176  */
 177 static int __init lite5200_probe(void)
 178 {
 179         unsigned long node = of_get_flat_dt_root();
 180         const char *model = of_get_flat_dt_prop(node, "model", NULL);
 181
 182         if (!of_flat_dt_is_compatible(node, "fsl,lite5200") &&
 183             !of_flat_dt_is_compatible(node, "fsl,lite5200b"))
 184                 return 0;
 185         pr_debug("%s board found\n", model ? model : "unknown");
 186
 187         return 1;
 188 }
 189
 190 define_machine(lite5200) {
 191         .name           = "lite5200",
 192         .probe          = lite5200_probe,
 193         .setup_arch     = lite5200_setup_arch,
 194         .init           = mpc52xx_declare_of_platform_devices,
 195         .init_IRQ       = mpc52xx_init_irq,
 196         .get_irq        = mpc52xx_get_irq,
 197         .restart        = mpc52xx_restart,
 198         .calibrate_decr = generic_calibrate_decr,
 199 };