target/linux/layerscape/patches-4.4/7146-staging-fsl-mc-Added-GICv3-ITS-support-for-FSL-MC-MS.patch

   1 From 85cb8ae26b6c69f0a118f32b7b7cd4f22d782da3 Mon Sep 17 00:00:00 2001
   2 From: "J. German Rivera" <German.Rivera@freescale.com>
   3 Date: Wed, 6 Jan 2016 16:03:22 -0600
   4 Subject: [PATCH 146/226] staging: fsl-mc: Added GICv3-ITS support for FSL-MC
   5  MSIs
   6
   7 Added platform-specific MSI support layer for FSL-MC devices.
   8
   9 Signed-off-by: J. German Rivera <German.Rivera@freescale.com>
  10 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  11 ---
  12  drivers/staging/fsl-mc/bus/Makefile                |    1 +
  13  .../staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c |  127 ++++++++++++++++++++
  14  drivers/staging/fsl-mc/include/mc-private.h        |    4 +
  15  3 files changed, 132 insertions(+)
  16  create mode 100644 drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c
  17
  18 --- a/drivers/staging/fsl-mc/bus/Makefile
  19 +++ b/drivers/staging/fsl-mc/bus/Makefile
  20 @@ -14,5 +14,6 @@ mc-bus-driver-objs := mc-bus.o \
  21                       dprc-driver.o \
  22                       mc-allocator.o \
  23                       mc-msi.o \
  24 +                     irq-gic-v3-its-fsl-mc-msi.o \
  25                       dpmcp.o \
  26                       dpbp.o
  27 --- /dev/null
  28 +++ b/drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c
  29 @@ -0,0 +1,127 @@
  30 +/*
  31 + * Freescale Management Complex (MC) bus driver MSI support
  32 + *
  33 + * Copyright (C) 2015 Freescale Semiconductor, Inc.
  34 + * Author: German Rivera <German.Rivera@freescale.com>
  35 + *
  36 + * This file is licensed under the terms of the GNU General Public
  37 + * License version 2. This program is licensed "as is" without any
  38 + * warranty of any kind, whether express or implied.
  39 + */
  40 +
  41 +#include "../include/mc-private.h"
  42 +#include <linux/of_device.h>
  43 +#include <linux/of_address.h>
  44 +#include <linux/irqchip/arm-gic-v3.h>
  45 +#include <linux/irq.h>
  46 +#include <linux/msi.h>
  47 +#include <linux/of.h>
  48 +#include <linux/of_irq.h>
  49 +#include "../include/mc-sys.h"
  50 +#include "dprc-cmd.h"
  51 +
  52 +static struct irq_chip its_msi_irq_chip = {
  53 +       .name = "fsl-mc-bus-msi",
  54 +       .irq_mask = irq_chip_mask_parent,
  55 +       .irq_unmask = irq_chip_unmask_parent,
  56 +       .irq_eoi = irq_chip_eoi_parent,
  57 +       .irq_set_affinity = msi_domain_set_affinity
  58 +};
  59 +
  60 +static int its_fsl_mc_msi_prepare(struct irq_domain *msi_domain,
  61 +                                 struct device *dev,
  62 +                                 int nvec, msi_alloc_info_t *info)
  63 +{
  64 +       struct fsl_mc_device *mc_bus_dev;
  65 +       struct msi_domain_info *msi_info;
  66 +
  67 +       if (WARN_ON(dev->bus != &fsl_mc_bus_type))
  68 +               return -EINVAL;
  69 +
  70 +       mc_bus_dev = to_fsl_mc_device(dev);
  71 +       if (WARN_ON(!(mc_bus_dev->flags & FSL_MC_IS_DPRC)))
  72 +               return -EINVAL;
  73 +
  74 +       /*
  75 +        * Set the device Id to be passed to the GIC-ITS:
  76 +        *
  77 +        * NOTE: This device id corresponds to the IOMMU stream ID
  78 +        * associated with the DPRC object (ICID).
  79 +        */
  80 +       info->scratchpad[0].ul = mc_bus_dev->icid;
  81 +       msi_info = msi_get_domain_info(msi_domain->parent);
  82 +       return msi_info->ops->msi_prepare(msi_domain->parent, dev, nvec, info);
  83 +}
  84 +
  85 +static struct msi_domain_ops its_fsl_mc_msi_ops = {
  86 +       .msi_prepare = its_fsl_mc_msi_prepare,
  87 +};
  88 +
  89 +static struct msi_domain_info its_fsl_mc_msi_domain_info = {
  90 +       .flags  = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
  91 +       .ops    = &its_fsl_mc_msi_ops,
  92 +       .chip   = &its_msi_irq_chip,
  93 +};
  94 +
  95 +static const struct of_device_id its_device_id[] = {
  96 +       {       .compatible     = "arm,gic-v3-its",     },
  97 +       {},
  98 +};
  99 +
 100 +int __init its_fsl_mc_msi_init(void)
 101 +{
 102 +       struct device_node *np;
 103 +       struct irq_domain *parent;
 104 +       struct irq_domain *mc_msi_domain;
 105 +
 106 +       for (np = of_find_matching_node(NULL, its_device_id); np;
 107 +            np = of_find_matching_node(np, its_device_id)) {
 108 +               if (!of_property_read_bool(np, "msi-controller"))
 109 +                       continue;
 110 +
 111 +               parent = irq_find_matching_host(np, DOMAIN_BUS_NEXUS);
 112 +               if (!parent || !msi_get_domain_info(parent)) {
 113 +                       pr_err("%s: unable to locate ITS domain\n",
 114 +                              np->full_name);
 115 +                       continue;
 116 +               }
 117 +
 118 +               mc_msi_domain = fsl_mc_msi_create_irq_domain(
 119 +                                                of_node_to_fwnode(np),
 120 +                                                &its_fsl_mc_msi_domain_info,
 121 +                                                parent);
 122 +               if (!mc_msi_domain) {
 123 +                       pr_err("%s: unable to create fsl-mc domain\n",
 124 +                              np->full_name);
 125 +                       continue;
 126 +               }
 127 +
 128 +               WARN_ON(mc_msi_domain->
 129 +                               host_data != &its_fsl_mc_msi_domain_info);
 130 +
 131 +               pr_info("fsl-mc MSI: %s domain created\n", np->full_name);
 132 +       }
 133 +
 134 +       return 0;
 135 +}
 136 +
 137 +void its_fsl_mc_msi_cleanup(void)
 138 +{
 139 +       struct device_node *np;
 140 +
 141 +       for (np = of_find_matching_node(NULL, its_device_id); np;
 142 +            np = of_find_matching_node(np, its_device_id)) {
 143 +               struct irq_domain *mc_msi_domain = irq_find_matching_host(
 144 +                                                       np,
 145 +                                                       DOMAIN_BUS_FSL_MC_MSI);
 146 +
 147 +               if (!of_property_read_bool(np, "msi-controller"))
 148 +                       continue;
 149 +
 150 +               mc_msi_domain = irq_find_matching_host(np,
 151 +                                                      DOMAIN_BUS_FSL_MC_MSI);
 152 +               if (mc_msi_domain &&
 153 +                   mc_msi_domain->host_data == &its_fsl_mc_msi_domain_info)
 154 +                       irq_domain_remove(mc_msi_domain);
 155 +       }
 156 +}
 157 --- a/drivers/staging/fsl-mc/include/mc-private.h
 158 +++ b/drivers/staging/fsl-mc/include/mc-private.h
 159 @@ -133,4 +133,8 @@ int fsl_mc_msi_domain_alloc_irqs(struct
 160
 161  void fsl_mc_msi_domain_free_irqs(struct device *dev);
 162
 163 +int __init its_fsl_mc_msi_init(void);
 164 +
 165 +void its_fsl_mc_msi_cleanup(void);
 166 +
 167  #endif /* _FSL_MC_PRIVATE_H_ */