arch/powerpc/platforms/82xx/mgcoge.c

   1 /*
   2  * Keymile mgcoge support
   3  * Copyright 2008 DENX Software Engineering GmbH
   4  * Author: Heiko Schocher <hs@denx.de>
   5  *
   6  * based on code from:
   7  * Copyright 2007 Freescale Semiconductor, Inc.
   8  * Author: Scott Wood <scottwood@freescale.com>
   9  *
  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 #include <linux/init.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/fsl_devices.h>
  19 #include <linux/of_platform.h>
  20
  21 #include <asm/io.h>
  22 #include <asm/cpm2.h>
  23 #include <asm/udbg.h>
  24 #include <asm/machdep.h>
  25 #include <asm/time.h>
  26 #include <asm/mpc8260.h>
  27 #include <asm/prom.h>
  28
  29 #include <sysdev/fsl_soc.h>
  30 #include <sysdev/cpm2_pic.h>
  31
  32 #include "pq2.h"
  33
  34 static void __init mgcoge_pic_init(void)
  35 {
  36         struct device_node *np = of_find_compatible_node(NULL, NULL, "fsl,pq2-pic");
  37         if (!np) {
  38                 printk(KERN_ERR "PIC init: can not find cpm-pic node\n");
  39                 return;
  40         }
  41
  42         cpm2_pic_init(np);
  43         of_node_put(np);
  44 }
  45
  46 struct cpm_pin {
  47         int port, pin, flags;
  48 };
  49
  50 static __initdata struct cpm_pin mgcoge_pins[] = {
  51
  52         /* SMC2 */
  53         {1, 8, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
  54         {1, 9, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
  55
  56         /* SCC4 */
  57         {3, 25, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
  58         {3, 24, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
  59         {3,  9, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
  60         {3,  8, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
  61         {4, 22, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
  62         {4, 21, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
  63 };
  64
  65 static void __init init_ioports(void)
  66 {
  67         int i;
  68
  69         for (i = 0; i < ARRAY_SIZE(mgcoge_pins); i++) {
  70                 const struct cpm_pin *pin = &mgcoge_pins[i];
  71                 cpm2_set_pin(pin->port - 1, pin->pin, pin->flags);
  72         }
  73
  74         cpm2_smc_clk_setup(CPM_CLK_SMC2, CPM_BRG8);
  75         cpm2_clk_setup(CPM_CLK_SCC4, CPM_CLK7, CPM_CLK_RX);
  76         cpm2_clk_setup(CPM_CLK_SCC4, CPM_CLK8, CPM_CLK_TX);
  77 }
  78
  79 static void __init mgcoge_setup_arch(void)
  80 {
  81         if (ppc_md.progress)
  82                 ppc_md.progress("mgcoge_setup_arch()", 0);
  83
  84         cpm2_reset();
  85
  86         /* When this is set, snooping CPM DMA from RAM causes
  87          * machine checks.  See erratum SIU18.
  88          */
  89         clrbits32(&cpm2_immr->im_siu_conf.siu_82xx.sc_bcr, MPC82XX_BCR_PLDP);
  90
  91         init_ioports();
  92
  93         if (ppc_md.progress)
  94                 ppc_md.progress("mgcoge_setup_arch(), finish", 0);
  95 }
  96
  97 static  __initdata struct of_device_id of_bus_ids[] = {
  98         { .compatible = "simple-bus", },
  99         {},
 100 };
 101
 102 static int __init declare_of_platform_devices(void)
 103 {
 104         of_platform_bus_probe(NULL, of_bus_ids, NULL);
 105
 106         return 0;
 107 }
 108 machine_device_initcall(mgcoge, declare_of_platform_devices);
 109
 110 /*
 111  * Called very early, device-tree isn't unflattened
 112  */
 113 static int __init mgcoge_probe(void)
 114 {
 115         unsigned long root = of_get_flat_dt_root();
 116         return of_flat_dt_is_compatible(root, "keymile,mgcoge");
 117 }
 118
 119 define_machine(mgcoge)
 120 {
 121         .name = "Keymile MGCOGE",
 122         .probe = mgcoge_probe,
 123         .setup_arch = mgcoge_setup_arch,
 124         .init_IRQ = mgcoge_pic_init,
 125         .get_irq = cpm2_get_irq,
 126         .calibrate_decr = generic_calibrate_decr,
 127         .restart = pq2_restart,
 128         .progress = udbg_progress,
 129 };