arch/powerpc/platforms/85xx/xes_mpc85xx.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2009 Extreme Engineering Solutions, Inc.
   4  *
   5  * X-ES board-specific functionality
   6  *
   7  * Based on mpc85xx_ds code from Freescale Semiconductor, Inc.
   8  *
   9  * Author: Nate Case <ncase@xes-inc.com>
  10  */
  11
  12 #include <linux/stddef.h>
  13 #include <linux/kernel.h>
  14 #include <linux/pci.h>
  15 #include <linux/kdev_t.h>
  16 #include <linux/delay.h>
  17 #include <linux/seq_file.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/of.h>
  20 #include <linux/of_address.h>
  21
  22 #include <asm/time.h>
  23 #include <asm/machdep.h>
  24 #include <asm/pci-bridge.h>
  25 #include <mm/mmu_decl.h>
  26 #include <asm/udbg.h>
  27 #include <asm/mpic.h>
  28
  29 #include <sysdev/fsl_soc.h>
  30 #include <sysdev/fsl_pci.h>
  31 #include "smp.h"
  32
  33 #include "mpc85xx.h"
  34
  35 /* A few bit definitions needed for fixups on some boards */
  36 #define MPC85xx_L2CTL_L2E               0x80000000 /* L2 enable */
  37 #define MPC85xx_L2CTL_L2I               0x40000000 /* L2 flash invalidate */
  38 #define MPC85xx_L2CTL_L2SIZ_MASK        0x30000000 /* L2 SRAM size (R/O) */
  39
  40 void __init xes_mpc85xx_pic_init(void)
  41 {
  42         struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN,
  43                         0, 256, " OpenPIC  ");
  44         BUG_ON(mpic == NULL);
  45         mpic_init(mpic);
  46 }
  47
  48 static void __init xes_mpc85xx_configure_l2(void __iomem *l2_base)
  49 {
  50         volatile uint32_t ctl, tmp;
  51
  52         asm volatile("msync; isync");
  53         tmp = in_be32(l2_base);
  54
  55         /*
  56          * xMon may have enabled part of L2 as SRAM, so we need to set it
  57          * up for all cache mode just to be safe.
  58          */
  59         printk(KERN_INFO "xes_mpc85xx: Enabling L2 as cache\n");
  60
  61         ctl = MPC85xx_L2CTL_L2E | MPC85xx_L2CTL_L2I;
  62         if (of_machine_is_compatible("MPC8540") ||
  63             of_machine_is_compatible("MPC8560"))
  64                 /*
  65                  * Assume L2 SRAM is used fully for cache, so set
  66                  * L2BLKSZ (bits 4:5) to match L2SIZ (bits 2:3).
  67                  */
  68                 ctl |= (tmp & MPC85xx_L2CTL_L2SIZ_MASK) >> 2;
  69
  70         asm volatile("msync; isync");
  71         out_be32(l2_base, ctl);
  72         asm volatile("msync; isync");
  73 }
  74
  75 static void __init xes_mpc85xx_fixups(void)
  76 {
  77         struct device_node *np;
  78         int err;
  79
  80         /*
  81          * Legacy xMon firmware on some X-ES boards does not enable L2
  82          * as cache.  We must ensure that they get enabled here.
  83          */
  84         for_each_node_by_name(np, "l2-cache-controller") {
  85                 struct resource r[2];
  86                 void __iomem *l2_base;
  87
  88                 /* Only MPC8548, MPC8540, and MPC8560 boards are affected */
  89                 if (!of_device_is_compatible(np,
  90                                     "fsl,mpc8548-l2-cache-controller") &&
  91                     !of_device_is_compatible(np,
  92                                     "fsl,mpc8540-l2-cache-controller") &&
  93                     !of_device_is_compatible(np,
  94                                     "fsl,mpc8560-l2-cache-controller"))
  95                         continue;
  96
  97                 err = of_address_to_resource(np, 0, &r[0]);
  98                 if (err) {
  99                         printk(KERN_WARNING "xes_mpc85xx: Could not get "
 100                                "resource for device tree node '%pOF'",
 101                                np);
 102                         continue;
 103                 }
 104
 105                 l2_base = ioremap(r[0].start, resource_size(&r[0]));
 106
 107                 xes_mpc85xx_configure_l2(l2_base);
 108         }
 109 }
 110
 111 /*
 112  * Setup the architecture
 113  */
 114 static void __init xes_mpc85xx_setup_arch(void)
 115 {
 116         struct device_node *root;
 117         const char *model = "Unknown";
 118
 119         root = of_find_node_by_path("/");
 120         if (root == NULL)
 121                 return;
 122
 123         model = of_get_property(root, "model", NULL);
 124
 125         printk(KERN_INFO "X-ES MPC85xx-based single-board computer: %s\n",
 126                model + strlen("xes,"));
 127
 128         xes_mpc85xx_fixups();
 129
 130         mpc85xx_smp_init();
 131
 132         fsl_pci_assign_primary();
 133 }
 134
 135 machine_arch_initcall(xes_mpc8572, mpc85xx_common_publish_devices);
 136 machine_arch_initcall(xes_mpc8548, mpc85xx_common_publish_devices);
 137 machine_arch_initcall(xes_mpc8540, mpc85xx_common_publish_devices);
 138
 139 define_machine(xes_mpc8572) {
 140         .name                   = "X-ES MPC8572",
 141         .compatible             = "xes,MPC8572",
 142         .setup_arch             = xes_mpc85xx_setup_arch,
 143         .init_IRQ               = xes_mpc85xx_pic_init,
 144 #ifdef CONFIG_PCI
 145         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 146         .pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
 147 #endif
 148         .get_irq                = mpic_get_irq,
 149         .progress               = udbg_progress,
 150 };
 151
 152 define_machine(xes_mpc8548) {
 153         .name                   = "X-ES MPC8548",
 154         .compatible             = "xes,MPC8548",
 155         .setup_arch             = xes_mpc85xx_setup_arch,
 156         .init_IRQ               = xes_mpc85xx_pic_init,
 157 #ifdef CONFIG_PCI
 158         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 159         .pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
 160 #endif
 161         .get_irq                = mpic_get_irq,
 162         .progress               = udbg_progress,
 163 };
 164
 165 define_machine(xes_mpc8540) {
 166         .name                   = "X-ES MPC8540",
 167         .compatible             = "xes,MPC8540",
 168         .setup_arch             = xes_mpc85xx_setup_arch,
 169         .init_IRQ               = xes_mpc85xx_pic_init,
 170 #ifdef CONFIG_PCI
 171         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 172         .pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
 173 #endif
 174         .get_irq                = mpic_get_irq,
 175         .progress               = udbg_progress,
 176 };