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authorTomasz Nowicki <tn@semihalf.com>2016-09-12 21:32:24 +0300
committerMarc Zyngier <marc.zyngier@arm.com>2016-09-12 22:32:42 +0300
commitdb40f0a7aea5e03ef044ef5dbc51a364e1ff7991 (patch)
tree353301e66a29bf17412e8e614de39a1c754cb926 /drivers/irqchip/irq-gic-v3-its.c
parentd14ae5e6bac36e88cd5deeee411104da424bc73d (diff)
downloadlinux-db40f0a7aea5e03ef044ef5dbc51a364e1ff7991.tar.xz
irqchip/gicv3-its: Refactor ITS DT init code to prepare for ACPI
In order to add ACPI support we need to isolate ACPI&DT common code and move DT logic to corresponding functions. To achieve this we are using firmware agnostic handle which can be unpacked to either DT or ACPI node. No functional changes other than a very minor one: 1. Terminate its_init call with -ENODEV for non-DT case which allows to remove hack from its-gic-v3.c. 2. Fix ITS base register address type (from 'unsigned long' to 'phys_addr_t'), as a bonus we get nice string formatting. 3. Since there is only one of ITS parent domain convert it to static global variable and drop the parameter from its_probe_one. Users can refer to it in more convenient way then. Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Tomasz Nowicki <tn@semihalf.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'drivers/irqchip/irq-gic-v3-its.c')
-rw-r--r--drivers/irqchip/irq-gic-v3-its.c65
1 files changed, 38 insertions, 27 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 943442d689d8..c7518c7b48bc 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -75,7 +75,7 @@ struct its_node {
raw_spinlock_t lock;
struct list_head entry;
void __iomem *base;
- unsigned long phys_base;
+ phys_addr_t phys_base;
struct its_cmd_block *cmd_base;
struct its_cmd_block *cmd_write;
struct its_baser tables[GITS_BASER_NR_REGS];
@@ -115,6 +115,7 @@ struct its_device {
static LIST_HEAD(its_nodes);
static DEFINE_SPINLOCK(its_lock);
static struct rdists *gic_rdists;
+static struct irq_domain *its_parent;
#define gic_data_rdist() (raw_cpu_ptr(gic_rdists->rdist))
#define gic_data_rdist_rd_base() (gic_data_rdist()->rd_base)
@@ -1614,8 +1615,7 @@ static void its_enable_quirks(struct its_node *its)
gic_enable_quirks(iidr, its_quirks, its);
}
-static int its_init_domain(struct device_node *node, struct its_node *its,
- struct irq_domain *parent)
+static int its_init_domain(struct fwnode_handle *handle, struct its_node *its)
{
struct irq_domain *inner_domain;
struct msi_domain_info *info;
@@ -1624,13 +1624,13 @@ static int its_init_domain(struct device_node *node, struct its_node *its,
if (!info)
return -ENOMEM;
- inner_domain = irq_domain_add_tree(node, &its_domain_ops, its);
+ inner_domain = irq_domain_create_tree(handle, &its_domain_ops, its);
if (!inner_domain) {
kfree(info);
return -ENOMEM;
}
- inner_domain->parent = parent;
+ inner_domain->parent = its_parent;
inner_domain->bus_token = DOMAIN_BUS_NEXUS;
info->ops = &its_msi_domain_ops;
info->data = its;
@@ -1639,43 +1639,35 @@ static int its_init_domain(struct device_node *node, struct its_node *its,
return 0;
}
-static int __init its_probe(struct device_node *node,
- struct irq_domain *parent)
+static int __init its_probe_one(struct resource *res,
+ struct fwnode_handle *handle, int numa_node)
{
- struct resource res;
struct its_node *its;
void __iomem *its_base;
u32 val;
u64 baser, tmp;
int err;
- err = of_address_to_resource(node, 0, &res);
- if (err) {
- pr_warn("%s: no regs?\n", node->full_name);
- return -ENXIO;
- }
-
- its_base = ioremap(res.start, resource_size(&res));
+ its_base = ioremap(res->start, resource_size(res));
if (!its_base) {
- pr_warn("%s: unable to map registers\n", node->full_name);
+ pr_warn("ITS@%pa: Unable to map ITS registers\n", &res->start);
return -ENOMEM;
}
val = readl_relaxed(its_base + GITS_PIDR2) & GIC_PIDR2_ARCH_MASK;
if (val != 0x30 && val != 0x40) {
- pr_warn("%s: no ITS detected, giving up\n", node->full_name);
+ pr_warn("ITS@%pa: No ITS detected, giving up\n", &res->start);
err = -ENODEV;
goto out_unmap;
}
err = its_force_quiescent(its_base);
if (err) {
- pr_warn("%s: failed to quiesce, giving up\n",
- node->full_name);
+ pr_warn("ITS@%pa: Failed to quiesce, giving up\n", &res->start);
goto out_unmap;
}
- pr_info("ITS: %s\n", node->full_name);
+ pr_info("ITS %pR\n", res);
its = kzalloc(sizeof(*its), GFP_KERNEL);
if (!its) {
@@ -1687,9 +1679,9 @@ static int __init its_probe(struct device_node *node,
INIT_LIST_HEAD(&its->entry);
INIT_LIST_HEAD(&its->its_device_list);
its->base = its_base;
- its->phys_base = res.start;
+ its->phys_base = res->start;
its->ite_size = ((readl_relaxed(its_base + GITS_TYPER) >> 4) & 0xf) + 1;
- its->numa_node = of_node_to_nid(node);
+ its->numa_node = numa_node;
its->cmd_base = kzalloc(ITS_CMD_QUEUE_SZ, GFP_KERNEL);
if (!its->cmd_base) {
@@ -1736,7 +1728,7 @@ static int __init its_probe(struct device_node *node,
writeq_relaxed(0, its->base + GITS_CWRITER);
writel_relaxed(GITS_CTLR_ENABLE, its->base + GITS_CTLR);
- err = its_init_domain(node, its, parent);
+ err = its_init_domain(handle, its);
if (err)
goto out_free_tables;
@@ -1754,7 +1746,7 @@ out_free_its:
kfree(its);
out_unmap:
iounmap(its_base);
- pr_err("ITS: failed probing %s (%d)\n", node->full_name, err);
+ pr_err("ITS@%pa: failed probing (%d)\n", &res->start, err);
return err;
}
@@ -1782,10 +1774,10 @@ static struct of_device_id its_device_id[] = {
{},
};
-int __init its_init(struct device_node *node, struct rdists *rdists,
- struct irq_domain *parent_domain)
+static int __init its_of_probe(struct device_node *node)
{
struct device_node *np;
+ struct resource res;
for (np = of_find_matching_node(node, its_device_id); np;
np = of_find_matching_node(np, its_device_id)) {
@@ -1795,8 +1787,27 @@ int __init its_init(struct device_node *node, struct rdists *rdists,
continue;
}
- its_probe(np, parent_domain);
+ if (of_address_to_resource(np, 0, &res)) {
+ pr_warn("%s: no regs?\n", np->full_name);
+ continue;
+ }
+
+ its_probe_one(&res, &np->fwnode, of_node_to_nid(np));
}
+ return 0;
+}
+
+int __init its_init(struct fwnode_handle *handle, struct rdists *rdists,
+ struct irq_domain *parent_domain)
+{
+ struct device_node *of_node;
+
+ its_parent = parent_domain;
+ of_node = to_of_node(handle);
+ if (of_node)
+ its_of_probe(of_node);
+ else
+ return -ENODEV;
if (list_empty(&its_nodes)) {
pr_warn("ITS: No ITS available, not enabling LPIs\n");