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authorTomasz Nowicki <tn@semihalf.com>2016-05-31 13:19:41 +0200
committerGraeme Gregory <graeme.gregory@linaro.org>2016-06-07 14:06:03 +0100
commit6470816f784247be7ff404eae23a8dc3b50b1c04 (patch)
treee755e75c522e2ac1d0a0cbb7399a54ef61426ba7
parent392ca4cd3e3ab9f2fcb44ac7f5b21fe4196640d4 (diff)
downloadleg-kernel-6470816f784247be7ff404eae23a8dc3b50b1c04.tar.gz
irqchip, GICv3, ITS: Refator 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. Fix ITS base register address type (from 'unsigned long' to 'phys_addr_t'), as a bonus we get nice string formatting. 2. 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>
-rw-r--r--drivers/irqchip/irq-gic-v3-its.c77
-rw-r--r--drivers/irqchip/irq-gic-v3.c6
-rw-r--r--include/linux/irqchip/arm-gic-v3.h4
3 files changed, 47 insertions, 40 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 43d32fcc9ec0..65feb8b8f653 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -74,7 +74,7 @@ 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];
@@ -114,6 +114,7 @@ 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)
@@ -837,7 +838,7 @@ static void its_free_tables(struct its_node *its)
}
}
-static int its_alloc_tables(const char *node_name, struct its_node *its)
+static int its_alloc_tables(struct its_node *its)
{
int err;
int i;
@@ -893,8 +894,8 @@ static int its_alloc_tables(const char *node_name, struct its_node *its)
order);
if (order >= MAX_ORDER) {
order = MAX_ORDER - 1;
- pr_warn("%s: Device Table too large, reduce its page order to %u\n",
- node_name, order);
+ pr_warn("ITS@%pa: Device Table too large, reduce its page order to %u\n",
+ &its->phys_base, order);
}
}
@@ -903,8 +904,8 @@ retry_alloc_baser:
if (alloc_pages > GITS_BASER_PAGES_MAX) {
alloc_pages = GITS_BASER_PAGES_MAX;
order = get_order(GITS_BASER_PAGES_MAX * psz);
- pr_warn("%s: Device Table too large, reduce its page order to %u (%u pages)\n",
- node_name, order, alloc_pages);
+ pr_warn("ITS@%pa: Device Table too large, reduce its page order to %u (%u pages)\n",
+ &its->phys_base, order, alloc_pages);
}
base = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
@@ -978,8 +979,8 @@ retry_baser:
}
if (val != tmp) {
- pr_err("ITS: %s: GITS_BASER%d doesn't stick: %lx %lx\n",
- node_name, i,
+ pr_err("ITS@%pa: GITS_BASER%d doesn't stick: %lx %lx\n",
+ &its->phys_base, i,
(unsigned long) val, (unsigned long) tmp);
err = -ENXIO;
goto out_free;
@@ -1507,8 +1508,7 @@ 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;
@@ -1517,13 +1517,13 @@ 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;
@@ -1532,43 +1532,35 @@ 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)
{
- 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@%pa\n", &res->start);
its = kzalloc(sizeof(*its), GFP_KERNEL);
if (!its) {
@@ -1580,7 +1572,7 @@ 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);
@@ -1593,7 +1585,7 @@ static int __init its_probe(struct device_node *node,
its_enable_quirks(its);
- err = its_alloc_tables(node->full_name, its);
+ err = its_alloc_tables(its);
if (err)
goto out_free_cmd;
@@ -1629,7 +1621,7 @@ 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;
@@ -1647,7 +1639,7 @@ 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;
}
@@ -1675,10 +1667,10 @@ 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)) {
@@ -1688,8 +1680,25 @@ 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);
}
+ 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);
if (list_empty(&its_nodes)) {
pr_warn("ITS: No ITS available, not enabling LPIs\n");
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 2c5ba0e704bf..019b44215087 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -911,7 +911,6 @@ static int __init gic_init_bases(void __iomem *dist_base,
u64 redist_stride,
struct fwnode_handle *handle)
{
- struct device_node *node;
u32 typer;
int gic_irqs;
int err;
@@ -952,10 +951,9 @@ static int __init gic_init_bases(void __iomem *dist_base,
set_handle_irq(gic_handle_irq);
- node = to_of_node(handle);
if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis() &&
- node) /* Temp hack to prevent ITS init for ACPI */
- its_init(node, &gic_data.rdists, gic_data.domain);
+ to_of_node(handle)) /* Temp hack to prevent ITS init for ACPI */
+ its_init(handle, &gic_data.rdists, gic_data.domain);
gic_smp_init();
gic_dist_init();
diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
index dc493e0f0ff7..21366395dcfc 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -334,9 +334,9 @@ struct rdists {
};
struct irq_domain;
-struct device_node;
+struct fwnode_handle;
int its_cpu_init(void);
-int its_init(struct device_node *node, struct rdists *rdists,
+int its_init(struct fwnode_handle *handle, struct rdists *rdists,
struct irq_domain *domain);
static inline bool gic_enable_sre(void)