platform/x86:intel/pmc: Move PMC Core related functions

Move functions that implements PMC Core feature from core_ssram.c
to core.c. This patch is a preparation step to introduce a new
SSRAM Telemetry driver for the SSRAM device.

Signed-off-by: Xi Pardee <xi.pardee@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20250409191056.15434-2-xi.pardee@linux.intel.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

1 files changed, 168 insertions, 0 deletions

diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
index 7a1d11f2914f..a42dc62d70da 100644
--- a/drivers/platform/x86/intel/pmc/core.c
+++ b/drivers/platform/x86/intel/pmc/core.c
@@ -1345,6 +1345,173 @@ static void pmc_core_dbgfs_register(struct pmc_dev *pmcdev)
 	}
 }
 
+static u32 pmc_core_find_guid(struct pmc_info *list, const struct pmc_reg_map *map)
+{
+	for (; list->map; ++list)
+		if (list->map == map)
+			return list->guid;
+
+	return 0;
+}
+
+static int pmc_core_get_lpm_req(struct pmc_dev *pmcdev, struct pmc *pmc)
+{
+	struct telem_endpoint *ep;
+	const u8 *lpm_indices;
+	int num_maps, mode_offset = 0;
+	int ret, mode;
+	int lpm_size;
+	u32 guid;
+
+	lpm_indices = pmc->map->lpm_reg_index;
+	num_maps = pmc->map->lpm_num_maps;
+	lpm_size = LPM_MAX_NUM_MODES * num_maps;
+
+	guid = pmc_core_find_guid(pmcdev->regmap_list, pmc->map);
+	if (!guid)
+		return -ENXIO;
+
+	ep = pmt_telem_find_and_register_endpoint(pmcdev->ssram_pcidev, guid, 0);
+	if (IS_ERR(ep)) {
+		dev_dbg(&pmcdev->pdev->dev, "couldn't get telem endpoint %ld",
+			PTR_ERR(ep));
+		return -EPROBE_DEFER;
+	}
+
+	pmc->lpm_req_regs = devm_kzalloc(&pmcdev->pdev->dev,
+					 lpm_size * sizeof(u32),
+					 GFP_KERNEL);
+	if (!pmc->lpm_req_regs) {
+		ret = -ENOMEM;
+		goto unregister_ep;
+	}
+
+	/*
+	 * PMC Low Power Mode (LPM) table
+	 *
+	 * In telemetry space, the LPM table contains a 4 byte header followed
+	 * by 8 consecutive mode blocks (one for each LPM mode). Each block
+	 * has a 4 byte header followed by a set of registers that describe the
+	 * IP state requirements for the given mode. The IP mapping is platform
+	 * specific but the same for each block, making for easy analysis.
+	 * Platforms only use a subset of the space to track the requirements
+	 * for their IPs. Callers provide the requirement registers they use as
+	 * a list of indices. Each requirement register is associated with an
+	 * IP map that's maintained by the caller.
+	 *
+	 * Header
+	 * +----+----------------------------+----------------------------+
+	 * |  0 |      REVISION              |      ENABLED MODES         |
+	 * +----+--------------+-------------+-------------+--------------+
+	 *
+	 * Low Power Mode 0 Block
+	 * +----+--------------+-------------+-------------+--------------+
+	 * |  1 |     SUB ID   |     SIZE    |   MAJOR     |   MINOR      |
+	 * +----+--------------+-------------+-------------+--------------+
+	 * |  2 |           LPM0 Requirements 0                           |
+	 * +----+---------------------------------------------------------+
+	 * |    |                  ...                                    |
+	 * +----+---------------------------------------------------------+
+	 * | 29 |           LPM0 Requirements 27                          |
+	 * +----+---------------------------------------------------------+
+	 *
+	 * ...
+	 *
+	 * Low Power Mode 7 Block
+	 * +----+--------------+-------------+-------------+--------------+
+	 * |    |     SUB ID   |     SIZE    |   MAJOR     |   MINOR      |
+	 * +----+--------------+-------------+-------------+--------------+
+	 * | 60 |           LPM7 Requirements 0                           |
+	 * +----+---------------------------------------------------------+
+	 * |    |                  ...                                    |
+	 * +----+---------------------------------------------------------+
+	 * | 87 |           LPM7 Requirements 27                          |
+	 * +----+---------------------------------------------------------+
+	 *
+	 */
+	mode_offset = LPM_HEADER_OFFSET + LPM_MODE_OFFSET;
+	pmc_for_each_mode(mode, pmcdev) {
+		u32 *req_offset = pmc->lpm_req_regs + (mode * num_maps);
+		int m;
+
+		for (m = 0; m < num_maps; m++) {
+			u8 sample_id = lpm_indices[m] + mode_offset;
+
+			ret = pmt_telem_read32(ep, sample_id, req_offset, 1);
+			if (ret) {
+				dev_err(&pmcdev->pdev->dev,
+					"couldn't read Low Power Mode requirements: %d\n", ret);
+				devm_kfree(&pmcdev->pdev->dev, pmc->lpm_req_regs);
+				goto unregister_ep;
+			}
+			++req_offset;
+		}
+		mode_offset += LPM_REG_COUNT + LPM_MODE_OFFSET;
+	}
+
+unregister_ep:
+	pmt_telem_unregister_endpoint(ep);
+
+	return ret;
+}
+
+static int pmc_core_ssram_get_lpm_reqs(struct pmc_dev *pmcdev)
+{
+	int ret, i;
+
+	if (!pmcdev->ssram_pcidev)
+		return -ENODEV;
+
+	for (i = 0; i < ARRAY_SIZE(pmcdev->pmcs); ++i) {
+		if (!pmcdev->pmcs[i])
+			continue;
+
+		ret = pmc_core_get_lpm_req(pmcdev, pmcdev->pmcs[i]);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+const struct pmc_reg_map *pmc_core_find_regmap(struct pmc_info *list, u16 devid)
+{
+	for (; list->map; ++list)
+		if (devid == list->devid)
+			return list->map;
+
+	return NULL;
+}
+
+int pmc_core_pmc_add(struct pmc_dev *pmcdev, u64 pwrm_base,
+		     const struct pmc_reg_map *reg_map, int pmc_index)
+{
+	struct pmc *pmc = pmcdev->pmcs[pmc_index];
+
+	if (!pwrm_base)
+		return -ENODEV;
+
+	/* Memory for primary PMC has been allocated in core.c */
+	if (!pmc) {
+		pmc = devm_kzalloc(&pmcdev->pdev->dev, sizeof(*pmc), GFP_KERNEL);
+		if (!pmc)
+			return -ENOMEM;
+	}
+
+	pmc->map = reg_map;
+	pmc->base_addr = pwrm_base;
+	pmc->regbase = ioremap(pmc->base_addr, pmc->map->regmap_length);
+
+	if (!pmc->regbase) {
+		devm_kfree(&pmcdev->pdev->dev, pmc);
+		return -ENOMEM;
+	}
+
+	pmcdev->pmcs[pmc_index] = pmc;
+
+	return 0;
+}
+
 /*
  * When supported, ssram init is used to achieve all available PMCs.
  * If ssram init fails, this function uses legacy method to at least get the
@@ -1719,5 +1886,6 @@ static struct platform_driver pmc_core_driver = {
 
 module_platform_driver(pmc_core_driver);
 
+MODULE_IMPORT_NS("INTEL_PMT_TELEMETRY");
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("Intel PMC Core Driver");