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platform/x86: intel_pmc_core: Read base address from LPIT 

Read SLP_S0 address from ACPI LPIT table when present and use PMC
specific SLP_S0 offset to get the base address of PMC MMIO.

Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@intel.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
hifive-unleashed-5.1
Srinivas Pandruvada 2018-02-02 19:13:34 +05:30 committed by Andy Shevchenko
parent 9383bbadfe
commit 745698c37c
1 changed files with 8 additions and 1 deletions
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9
drivers/platform/x86/intel_pmc_core.c
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@ -20,6 +20,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/acpi.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/io.h>
@ -455,6 +456,7 @@ static int __init pmc_core_probe(void)
{
struct pmc_dev *pmcdev = &pmc;
const struct x86_cpu_id *cpu_id;
u64 slp_s0_addr;
int err;
cpu_id = x86_match_cpu(intel_pmc_core_ids);
@ -462,7 +464,12 @@ static int __init pmc_core_probe(void)
return -ENODEV;
pmcdev->map = (struct pmc_reg_map *)cpu_id->driver_data;
pmcdev->base_addr = PMC_BASE_ADDR_DEFAULT;
if (lpit_read_residency_count_address(&slp_s0_addr))
pmcdev->base_addr = PMC_BASE_ADDR_DEFAULT;
else
pmcdev->base_addr = slp_s0_addr - pmcdev->map->slp_s0_offset;
pmcdev->regbase = ioremap(pmcdev->base_addr,
pmcdev->map->regmap_length);
if (!pmcdev->regbase)