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soc/tegra: pmc: Restrict legacy code to 32-bit ARM 

For backwards-compatibility with old device trees, if no PMC node exists
this driver hard-codes the I/O memory region. All 64-bit ARM device tree
files are recent enough that they can be required to have this node, and
therefore the legacy code path is not required on 64-bit ARM.

Based on work done by Paul Walmsley <pwalmsley@nvidia.com>.

Cc: Paul Walmsley <pwalmsley@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2015-04-29 12:42:28 +02:00
parent 95169cd23b
commit 7d71e90377
1 changed files with 39 additions and 13 deletions
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52
drivers/soc/tegra/pmc.c
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@ -17,6 +17,8 @@
*
*/
#define pr_fmt(fmt) "tegra-pmc: " fmt
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/clk/tegra.h>
@ -1003,6 +1005,7 @@ static const struct tegra_pmc_soc tegra124_pmc_soc = {
};
static const struct of_device_id tegra_pmc_match[] = {
{ .compatible = "nvidia,tegra132-pmc", .data = &tegra124_pmc_soc },
{ .compatible = "nvidia,tegra124-pmc", .data = &tegra124_pmc_soc },
{ .compatible = "nvidia,tegra114-pmc", .data = &tegra114_pmc_soc },
{ .compatible = "nvidia,tegra30-pmc", .data = &tegra30_pmc_soc },
@ -1035,25 +1038,44 @@ static int __init tegra_pmc_early_init(void)
bool invert;
u32 value;
if (!soc_is_tegra())
return 0;
np = of_find_matching_node_and_match(NULL, tegra_pmc_match, &match);
if (!np) {
pr_warn("PMC device node not found, disabling powergating\n");
/*
* Fall back to legacy initialization for 32-bit ARM only. All
* 64-bit ARM device tree files for Tegra are required to have
* a PMC node.
*
* This is for backwards-compatibility with old device trees
* that didn't contain a PMC node. Note that in this case the
* SoC data can't be matched and therefore powergating is
* disabled.
*/
if (IS_ENABLED(CONFIG_ARM) && soc_is_tegra()) {
pr_warn("DT node not found, powergating disabled\n");
regs.start = 0x7000e400;
regs.end = 0x7000e7ff;
regs.flags = IORESOURCE_MEM;
regs.start = 0x7000e400;
regs.end = 0x7000e7ff;
regs.flags = IORESOURCE_MEM;
pr_warn("Using memory region %pR\n", &regs);
pr_warn("Using memory region %pR\n", &regs);
} else {
/*
* At this point we're not running on Tegra, so play
* nice with multi-platform kernels.
*/
return 0;
}
} else {
pmc->soc = match->data;
}
/*
* Extract information from the device tree if we've found a
* matching node.
*/
if (of_address_to_resource(np, 0, &regs) < 0) {
pr_err("failed to get PMC registers\n");
return -ENXIO;
}
if (of_address_to_resource(np, 0, &regs) < 0) {
pr_err("failed to get PMC registers\n");
return -ENXIO;
pmc->soc = match->data;
}
pmc->base = ioremap_nocache(regs.start, resource_size(&regs));
@ -1064,6 +1086,10 @@ static int __init tegra_pmc_early_init(void)
mutex_init(&pmc->powergates_lock);
/*
* Invert the interrupt polarity if a PMC device tree node exists and
* contains the nvidia,invert-interrupt property.
*/
invert = of_property_read_bool(np, "nvidia,invert-interrupt");
value = tegra_pmc_readl(PMC_CNTRL);