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authorJon Hunter <jonathanh@nvidia.com>2017-03-28 14:42:58 +0200
committerThierry Reding <treding@nvidia.com>2017-04-04 15:52:31 +0200
commit1fd09e5d884a5ff4060948e0cf8f5d7eed16e936 (patch)
tree0c144b405f67869167a3cc5d33419d9e7476e2ca /drivers/soc/tegra
parentsoc/tegra: flowctrl: Add basic platform driver (diff)
downloadlinux-1fd09e5d884a5ff4060948e0cf8f5d7eed16e936.tar.xz
linux-1fd09e5d884a5ff4060948e0cf8f5d7eed16e936.zip
soc/tegra: Add initial flowctrl support for Tegra132/210
Tegra132 and Tegra210 support the flowctrl module and so add initial support for these devices. Please note that Tegra186 does not support the flowctrl module, so update the initialisation function such that we do not fall back and attempt to map the 'hardcoded' address range for Tegra186. Furthermore 64-bit Tegra devices have always had the flowctrl node defined in their device-tree and so only use the 'hardcoded' addresses for 32-bit Tegra devices. Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/soc/tegra')
-rw-r--r--drivers/soc/tegra/Kconfig2
-rw-r--r--drivers/soc/tegra/flowctrl.c31
2 files changed, 23 insertions, 10 deletions
diff --git a/drivers/soc/tegra/Kconfig b/drivers/soc/tegra/Kconfig
index c7e8ddfb574e..dcf088db40b6 100644
--- a/drivers/soc/tegra/Kconfig
+++ b/drivers/soc/tegra/Kconfig
@@ -63,6 +63,7 @@ if ARM64
config ARCH_TEGRA_132_SOC
bool "NVIDIA Tegra132 SoC"
select PINCTRL_TEGRA124
+ select SOC_TEGRA_FLOWCTRL
select SOC_TEGRA_PMC
help
Enable support for NVIDIA Tegra132 SoC, based on the Denver
@@ -73,6 +74,7 @@ config ARCH_TEGRA_132_SOC
config ARCH_TEGRA_210_SOC
bool "NVIDIA Tegra210 SoC"
select PINCTRL_TEGRA210
+ select SOC_TEGRA_FLOWCTRL
select SOC_TEGRA_PMC
help
Enable support for the NVIDIA Tegra210 SoC. Also known as Tegra X1,
diff --git a/drivers/soc/tegra/flowctrl.c b/drivers/soc/tegra/flowctrl.c
index 25eddfc8475d..0e345c05fc65 100644
--- a/drivers/soc/tegra/flowctrl.c
+++ b/drivers/soc/tegra/flowctrl.c
@@ -165,6 +165,7 @@ static int tegra_flowctrl_probe(struct platform_device *pdev)
}
static const struct of_device_id tegra_flowctrl_match[] = {
+ { .compatible = "nvidia,tegra210-flowctrl" },
{ .compatible = "nvidia,tegra124-flowctrl" },
{ .compatible = "nvidia,tegra114-flowctrl" },
{ .compatible = "nvidia,tegra30-flowctrl" },
@@ -184,9 +185,7 @@ builtin_platform_driver(tegra_flowctrl_driver);
static int __init tegra_flowctrl_init(void)
{
- /* hardcoded fallback if device tree node is missing */
- unsigned long base = 0x60007000;
- unsigned long size = SZ_4K;
+ struct resource res;
struct device_node *np;
if (!soc_is_tegra())
@@ -194,17 +193,29 @@ static int __init tegra_flowctrl_init(void)
np = of_find_matching_node(NULL, tegra_flowctrl_match);
if (np) {
- struct resource res;
-
- if (of_address_to_resource(np, 0, &res) == 0) {
- size = resource_size(&res);
- base = res.start;
+ if (of_address_to_resource(np, 0, &res) < 0) {
+ pr_err("failed to get flowctrl register\n");
+ return -ENXIO;
}
-
of_node_put(np);
+ } else if (IS_ENABLED(CONFIG_ARM)) {
+ /*
+ * Hardcoded fallback for 32-bit Tegra
+ * devices if device tree node is missing.
+ */
+ res.start = 0x60007000;
+ res.end = 0x60007fff;
+ res.flags = IORESOURCE_MEM;
+ } else {
+ /*
+ * At this point we're running on a Tegra,
+ * that doesn't support the flow controller
+ * (eg. Tegra186), so just return.
+ */
+ return 0;
}
- tegra_flowctrl_base = ioremap_nocache(base, size);
+ tegra_flowctrl_base = ioremap_nocache(res.start, resource_size(&res));
if (!tegra_flowctrl_base)
return -ENXIO;