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Subject[PATCH v3 1/3] platform/x86: intel_pmc_core: Convert to a platform_driver
From
Convert the intel_pmc_core driver to a platform driver, and attach using
the ACPI enumeration method (via the ACPI device "INT33A1").

Signed-off-by: Rajat Jain <rajatja@google.com>
---
v3: Don't instantiate the platform_device. Use ACPI enumeration.
v2: Rephrase the commit log. No code changes.

drivers/platform/x86/intel_pmc_core.c | 92 ++++++++++++++++++---------
1 file changed, 63 insertions(+), 29 deletions(-)

diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
index f2c621b55f49..331889a57f73 100644
--- a/drivers/platform/x86/intel_pmc_core.c
+++ b/drivers/platform/x86/intel_pmc_core.c
@@ -19,6 +19,7 @@
#include <linux/io.h>
#include <linux/module.h>
#include <linux/pci.h>
+#include <linux/platform_device.h>
#include <linux/uaccess.h>

#include <asm/cpu_device_id.h>
@@ -806,18 +807,6 @@ static inline void pmc_core_dbgfs_unregister(struct pmc_dev *pmcdev)
}
#endif /* CONFIG_DEBUG_FS */

-static const struct x86_cpu_id intel_pmc_core_ids[] = {
- INTEL_CPU_FAM6(SKYLAKE_MOBILE, spt_reg_map),
- INTEL_CPU_FAM6(SKYLAKE_DESKTOP, spt_reg_map),
- INTEL_CPU_FAM6(KABYLAKE_MOBILE, spt_reg_map),
- INTEL_CPU_FAM6(KABYLAKE_DESKTOP, spt_reg_map),
- INTEL_CPU_FAM6(CANNONLAKE_MOBILE, cnp_reg_map),
- INTEL_CPU_FAM6(ICELAKE_MOBILE, icl_reg_map),
- {}
-};
-
-MODULE_DEVICE_TABLE(x86cpu, intel_pmc_core_ids);
-
static const struct pci_device_id pmc_pci_ids[] = {
{ PCI_VDEVICE(INTEL, SPT_PMC_PCI_DEVICE_ID), 0},
{ 0, },
@@ -854,26 +843,50 @@ static const struct dmi_system_id pmc_core_dmi_table[] = {
{}
};

-static int __init pmc_core_probe(void)
+static int pmc_core_probe(struct platform_device *pdev)
{
+ static bool device_initialized;
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);
- if (!cpu_id)
+ if (device_initialized)
return -ENODEV;

- pmcdev->map = (struct pmc_reg_map *)cpu_id->driver_data;
+ switch (boot_cpu_data.x86_model) {
+ case INTEL_FAM6_SKYLAKE_MOBILE:
+ case INTEL_FAM6_SKYLAKE_DESKTOP:
+ case INTEL_FAM6_KABYLAKE_MOBILE:
+ case INTEL_FAM6_KABYLAKE_DESKTOP:

- /*
- * Coffeelake has CPU ID of Kabylake and Cannonlake PCH. So here
- * Sunrisepoint PCH regmap can't be used. Use Cannonlake PCH regmap
- * in this case.
- */
- if (pmcdev->map == &spt_reg_map && !pci_dev_present(pmc_pci_ids))
+ pmcdev->map = &spt_reg_map;
+
+ /*
+ * Special case: Coffeelake has CPU ID of Kabylake, but has
+ * Cannonlake PCH. So need to use cnp_reg_map instead of
+ * spt_reg_map for this special case. The PMC core PCI device
+ * on Coffeelake is hidden, so use that as the deciding factor.
+ */
+ if (!pci_dev_present(pmc_pci_ids))
+ pmcdev->map = &cnp_reg_map;
+
+ break;
+
+ case INTEL_FAM6_CANNONLAKE_MOBILE:
pmcdev->map = &cnp_reg_map;
+ break;
+
+ case INTEL_FAM6_ICELAKE_MOBILE:
+ pmcdev->map = &icl_reg_map;
+ break;
+ default:
+ /*
+ * Which map should we use by default? If not specified
+ * explicitly, assume Icelake by default for now.
+ */
+ pmcdev->map = &icl_reg_map;
+ break;
+ }

if (lpit_read_residency_count_address(&slp_s0_addr))
pmcdev->base_addr = PMC_BASE_ADDR_DEFAULT;
@@ -890,26 +903,47 @@ static int __init pmc_core_probe(void)

err = pmc_core_dbgfs_register(pmcdev);
if (err < 0) {
- pr_warn(" debugfs register failed.\n");
+ dev_warn(&pdev->dev, "debugfs register failed.\n");
iounmap(pmcdev->regbase);
return err;
}

dmi_check_system(pmc_core_dmi_table);
- pr_info(" initialized\n");
+ platform_set_drvdata(pdev, pmcdev);
+
+ dev_info(&pdev->dev, " initialized\n");
+ device_initialized = true;
+
return 0;
}
-module_init(pmc_core_probe)

-static void __exit pmc_core_remove(void)
+static int pmc_core_remove(struct platform_device *pdev)
{
- struct pmc_dev *pmcdev = &pmc;
+ struct pmc_dev *pmcdev = platform_get_drvdata(pdev);

+ platform_set_drvdata(pdev, NULL);
pmc_core_dbgfs_unregister(pmcdev);
mutex_destroy(&pmcdev->lock);
iounmap(pmcdev->regbase);
+ return 0;
}
-module_exit(pmc_core_remove)
+
+static const struct acpi_device_id pmc_core_acpi_ids[] = {
+ {"INT33A1", 0}, /* _HID for Intel Power Engine, _CID PNP0D80*/
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, pmc_core_acpi_ids);
+
+static struct platform_driver pmc_core_driver = {
+ .driver = {
+ .name = "pmc_core",
+ .acpi_match_table = ACPI_PTR(pmc_core_acpi_ids),
+ },
+ .probe = pmc_core_probe,
+ .remove = pmc_core_remove,
+};
+
+module_platform_driver(pmc_core_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel PMC Core Driver");
--
2.21.0.392.gf8f6787159e-goog
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