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

DEFINITIONS

1. lite5200_fix_clock_config
2. lite5200_fix_port_config
3. lite5200_suspend_prepare
4. lite5200_resume_finish
5. lite5200_setup_arch
6. lite5200_probe
7. define_machine

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Freescale Lite5200 board support
   4  *
   5  * Written by: Grant Likely <grant.likely@secretlab.ca>
   6  *
   7  * Copyright (C) Secret Lab Technologies Ltd. 2006. All rights reserved.
   8  * Copyright 2006 Freescale Semiconductor, Inc. All rights reserved.
   9  *
  10  * Description:
  11  */
  12 
  13 #undef DEBUG
  14 
  15 #include <linux/init.h>
  16 #include <linux/pci.h>
  17 #include <linux/of.h>
  18 #include <linux/of_address.h>
  19 #include <linux/root_dev.h>
  20 #include <linux/initrd.h>
  21 #include <asm/time.h>
  22 #include <asm/io.h>
  23 #include <asm/machdep.h>
  24 #include <asm/prom.h>
  25 #include <asm/mpc52xx.h>
  26 
  27 /* ************************************************************************
  28  *
  29  * Setup the architecture
  30  *
  31  */
  32 
  33 /* mpc5200 device tree match tables */
  34 static const struct of_device_id mpc5200_cdm_ids[] __initconst = {
  35         { .compatible = "fsl,mpc5200-cdm", },
  36         { .compatible = "mpc5200-cdm", },
  37         {}
  38 };
  39 
  40 static const struct of_device_id mpc5200_gpio_ids[] __initconst = {
  41         { .compatible = "fsl,mpc5200-gpio", },
  42         { .compatible = "mpc5200-gpio", },
  43         {}
  44 };
  45 
  46 /*
  47  * Fix clock configuration.
  48  *
  49  * Firmware is supposed to be responsible for this.  If you are creating a
  50  * new board port, do *NOT* duplicate this code.  Fix your boot firmware
  51  * to set it correctly in the first place
  52  */
  53 static void __init
  54 lite5200_fix_clock_config(void)
  55 {
  56         struct device_node *np;
  57         struct mpc52xx_cdm  __iomem *cdm;
  58         /* Map zones */
  59         np = of_find_matching_node(NULL, mpc5200_cdm_ids);
  60         cdm = of_iomap(np, 0);
  61         of_node_put(np);
  62         if (!cdm) {
  63                 printk(KERN_ERR "%s() failed; expect abnormal behaviour\n",
  64                        __func__);
  65                 return;
  66         }
  67 
  68         /* Use internal 48 Mhz */
  69         out_8(&cdm->ext_48mhz_en, 0x00);
  70         out_8(&cdm->fd_enable, 0x01);
  71         if (in_be32(&cdm->rstcfg) & 0x40)       /* Assumes 33Mhz clock */
  72                 out_be16(&cdm->fd_counters, 0x0001);
  73         else
  74                 out_be16(&cdm->fd_counters, 0x5555);
  75 
  76         /* Unmap the regs */
  77         iounmap(cdm);
  78 }
  79 
  80 /*
  81  * Fix setting of port_config register.
  82  *
  83  * Firmware is supposed to be responsible for this.  If you are creating a
  84  * new board port, do *NOT* duplicate this code.  Fix your boot firmware
  85  * to set it correctly in the first place
  86  */
  87 static void __init
  88 lite5200_fix_port_config(void)
  89 {
  90         struct device_node *np;
  91         struct mpc52xx_gpio __iomem *gpio;
  92         u32 port_config;
  93 
  94         np = of_find_matching_node(NULL, mpc5200_gpio_ids);
  95         gpio = of_iomap(np, 0);
  96         of_node_put(np);
  97         if (!gpio) {
  98                 printk(KERN_ERR "%s() failed. expect abnormal behavior\n",
  99                        __func__);
 100                 return;
 101         }
 102 
 103         /* Set port config */
 104         port_config = in_be32(&gpio->port_config);
 105 
 106         port_config &= ~0x00800000;     /* 48Mhz internal, pin is GPIO  */
 107 
 108         port_config &= ~0x00007000;     /* USB port : Differential mode */
 109         port_config |=  0x00001000;     /*            USB 1 only        */
 110 
 111         port_config &= ~0x03000000;     /* ATA CS is on csb_4/5         */
 112         port_config |=  0x01000000;
 113 
 114         pr_debug("port_config: old:%x new:%x\n",
 115                  in_be32(&gpio->port_config), port_config);
 116         out_be32(&gpio->port_config, port_config);
 117 
 118         /* Unmap zone */
 119         iounmap(gpio);
 120 }
 121 
 122 #ifdef CONFIG_PM
 123 static void lite5200_suspend_prepare(void __iomem *mbar)
 124 {
 125         u8 pin = 1;     /* GPIO_WKUP_1 (GPIO_PSC2_4) */
 126         u8 level = 0;   /* wakeup on low level */
 127         mpc52xx_set_wakeup_gpio(pin, level);
 128 
 129         /*
 130          * power down usb port
 131          * this needs to be called before of-ohci suspend code
 132          */
 133 
 134         /* set ports to "power switched" and "powered at the same time"
 135          * USB Rh descriptor A: NPS = 0, PSM = 0 */
 136         out_be32(mbar + 0x1048, in_be32(mbar + 0x1048) & ~0x300);
 137         /* USB Rh status: LPS = 1 - turn off power */
 138         out_be32(mbar + 0x1050, 0x00000001);
 139 }
 140 
 141 static void lite5200_resume_finish(void __iomem *mbar)
 142 {
 143         /* USB Rh status: LPSC = 1 - turn on power */
 144         out_be32(mbar + 0x1050, 0x00010000);
 145 }
 146 #endif
 147 
 148 static void __init lite5200_setup_arch(void)
 149 {
 150         if (ppc_md.progress)
 151                 ppc_md.progress("lite5200_setup_arch()", 0);
 152 
 153         /* Map important registers from the internal memory map */
 154         mpc52xx_map_common_devices();
 155 
 156         /* Some mpc5200 & mpc5200b related configuration */
 157         mpc5200_setup_xlb_arbiter();
 158 
 159         /* Fix things that firmware should have done. */
 160         lite5200_fix_clock_config();
 161         lite5200_fix_port_config();
 162 
 163 #ifdef CONFIG_PM
 164         mpc52xx_suspend.board_suspend_prepare = lite5200_suspend_prepare;
 165         mpc52xx_suspend.board_resume_finish = lite5200_resume_finish;
 166         lite5200_pm_init();
 167 #endif
 168 
 169         mpc52xx_setup_pci();
 170 }
 171 
 172 static const char * const board[] __initconst = {
 173         "fsl,lite5200",
 174         "fsl,lite5200b",
 175         NULL,
 176 };
 177 
 178 /*
 179  * Called very early, MMU is off, device-tree isn't unflattened
 180  */
 181 static int __init lite5200_probe(void)
 182 {
 183         return of_device_compatible_match(of_root, board);
 184 }
 185 
 186 define_machine(lite5200) {
 187         .name           = "lite5200",
 188         .probe          = lite5200_probe,
 189         .setup_arch     = lite5200_setup_arch,
 190         .init           = mpc52xx_declare_of_platform_devices,
 191         .init_IRQ       = mpc52xx_init_irq,
 192         .get_irq        = mpc52xx_get_irq,
 193         .restart        = mpc52xx_restart,
 194         .calibrate_decr = generic_calibrate_decr,
 195 };