arch/powerpc/platforms/86xx/mvme7100.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Board setup routines for the Emerson/Artesyn MVME7100
   4  *
   5  * Copyright 2016 Elettra-Sincrotrone Trieste S.C.p.A.
   6  *
   7  * Author: Alessio Igor Bogani <alessio.bogani@elettra.eu>
   8  *
   9  * Based on earlier code by:
  10  *
  11  *      Ajit Prem <ajit.prem@emerson.com>
  12  *      Copyright 2008 Emerson
  13  *
  14  * USB host fixup is borrowed by:
  15  *
  16  *      Martyn Welch <martyn.welch@ge.com>
  17  *      Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
  18  */
  19
  20 #include <linux/pci.h>
  21 #include <linux/of.h>
  22 #include <linux/of_platform.h>
  23 #include <linux/of_address.h>
  24 #include <asm/udbg.h>
  25 #include <asm/mpic.h>
  26 #include <sysdev/fsl_soc.h>
  27 #include <sysdev/fsl_pci.h>
  28
  29 #include "mpc86xx.h"
  30
  31 #define MVME7100_INTERRUPT_REG_2_OFFSET 0x05
  32 #define MVME7100_DS1375_MASK            0x40
  33 #define MVME7100_MAX6649_MASK           0x20
  34 #define MVME7100_ABORT_MASK             0x10
  35
  36 /*
  37  * Setup the architecture
  38  */
  39 static void __init mvme7100_setup_arch(void)
  40 {
  41         struct device_node *bcsr_node;
  42         void __iomem *mvme7100_regs = NULL;
  43         u8 reg;
  44
  45         if (ppc_md.progress)
  46                 ppc_md.progress("mvme7100_setup_arch()", 0);
  47
  48 #ifdef CONFIG_SMP
  49         mpc86xx_smp_init();
  50 #endif
  51
  52         fsl_pci_assign_primary();
  53
  54         /* Remap BCSR registers */
  55         bcsr_node = of_find_compatible_node(NULL, NULL,
  56                         "artesyn,mvme7100-bcsr");
  57         if (bcsr_node) {
  58                 mvme7100_regs = of_iomap(bcsr_node, 0);
  59                 of_node_put(bcsr_node);
  60         }
  61
  62         if (mvme7100_regs) {
  63                 /* Disable ds1375, max6649, and abort interrupts */
  64                 reg = readb(mvme7100_regs + MVME7100_INTERRUPT_REG_2_OFFSET);
  65                 reg |= MVME7100_DS1375_MASK | MVME7100_MAX6649_MASK
  66                         | MVME7100_ABORT_MASK;
  67                 writeb(reg, mvme7100_regs + MVME7100_INTERRUPT_REG_2_OFFSET);
  68         } else
  69                 pr_warn("Unable to map board registers\n");
  70
  71         pr_info("MVME7100 board from Artesyn\n");
  72 }
  73
  74 /*
  75  * Called very early, device-tree isn't unflattened
  76  */
  77 static int __init mvme7100_probe(void)
  78 {
  79         unsigned long root = of_get_flat_dt_root();
  80
  81         return of_flat_dt_is_compatible(root, "artesyn,MVME7100");
  82 }
  83
  84 static void mvme7100_usb_host_fixup(struct pci_dev *pdev)
  85 {
  86         unsigned int val;
  87
  88         if (!machine_is(mvme7100))
  89                 return;
  90
  91         /* Ensure only ports 1 & 2 are enabled */
  92         pci_read_config_dword(pdev, 0xe0, &val);
  93         pci_write_config_dword(pdev, 0xe0, (val & ~7) | 0x2);
  94
  95         /* System clock is 48-MHz Oscillator and EHCI Enabled. */
  96         pci_write_config_dword(pdev, 0xe4, 1 << 5);
  97 }
  98 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
  99         mvme7100_usb_host_fixup);
 100
 101 machine_arch_initcall(mvme7100, mpc86xx_common_publish_devices);
 102
 103 define_machine(mvme7100) {
 104         .name                   = "MVME7100",
 105         .probe                  = mvme7100_probe,
 106         .setup_arch             = mvme7100_setup_arch,
 107         .init_IRQ               = mpc86xx_init_irq,
 108         .get_irq                = mpic_get_irq,
 109         .time_init              = mpc86xx_time_init,
 110         .calibrate_decr         = generic_calibrate_decr,
 111         .progress               = udbg_progress,
 112 #ifdef CONFIG_PCI
 113         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 114 #endif
 115 };