--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * MAX10 BMC Platform Management Component Interface (PMCI) based
+ * interface.
+ *
+ * Copyright (C) 2020-2023 Intel Corporation.
+ */
+
+#include <linux/device.h>
+#include <linux/dfl.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/intel-m10-bmc.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+struct m10bmc_pmci_device {
+ void __iomem *base;
+ struct intel_m10bmc m10bmc;
+};
+
+/*
+ * Intel FGPA indirect register access via hardware controller/bridge.
+ */
+#define INDIRECT_CMD_OFF 0
+#define INDIRECT_CMD_CLR 0
+#define INDIRECT_CMD_RD BIT(0)
+#define INDIRECT_CMD_WR BIT(1)
+#define INDIRECT_CMD_ACK BIT(2)
+
+#define INDIRECT_ADDR_OFF 0x4
+#define INDIRECT_RD_OFF 0x8
+#define INDIRECT_WR_OFF 0xc
+
+#define INDIRECT_INT_US 1
+#define INDIRECT_TIMEOUT_US 10000
+
+struct indirect_ctx {
+ void __iomem *base;
+ struct device *dev;
+};
+
+static int indirect_clear_cmd(struct indirect_ctx *ctx)
+{
+ unsigned int cmd;
+ int ret;
+
+ writel(INDIRECT_CMD_CLR, ctx->base + INDIRECT_CMD_OFF);
+
+ ret = readl_poll_timeout(ctx->base + INDIRECT_CMD_OFF, cmd,
+ cmd == INDIRECT_CMD_CLR,
+ INDIRECT_INT_US, INDIRECT_TIMEOUT_US);
+ if (ret)
+ dev_err(ctx->dev, "timed out waiting clear cmd (residual cmd=0x%x)\n", cmd);
+
+ return ret;
+}
+
+static int indirect_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+ struct indirect_ctx *ctx = context;
+ unsigned int cmd, ack, tmpval;
+ int ret, ret2;
+
+ cmd = readl(ctx->base + INDIRECT_CMD_OFF);
+ if (cmd != INDIRECT_CMD_CLR)
+ dev_warn(ctx->dev, "residual cmd 0x%x on read entry\n", cmd);
+
+ writel(reg, ctx->base + INDIRECT_ADDR_OFF);
+ writel(INDIRECT_CMD_RD, ctx->base + INDIRECT_CMD_OFF);
+
+ ret = readl_poll_timeout(ctx->base + INDIRECT_CMD_OFF, ack,
+ (ack & INDIRECT_CMD_ACK) == INDIRECT_CMD_ACK,
+ INDIRECT_INT_US, INDIRECT_TIMEOUT_US);
+ if (ret)
+ dev_err(ctx->dev, "read timed out on reg 0x%x ack 0x%x\n", reg, ack);
+ else
+ tmpval = readl(ctx->base + INDIRECT_RD_OFF);
+
+ ret2 = indirect_clear_cmd(ctx);
+
+ if (ret)
+ return ret;
+ if (ret2)
+ return ret2;
+
+ *val = tmpval;
+ return 0;
+}
+
+static int indirect_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+ struct indirect_ctx *ctx = context;
+ unsigned int cmd, ack;
+ int ret, ret2;
+
+ cmd = readl(ctx->base + INDIRECT_CMD_OFF);
+ if (cmd != INDIRECT_CMD_CLR)
+ dev_warn(ctx->dev, "residual cmd 0x%x on write entry\n", cmd);
+
+ writel(val, ctx->base + INDIRECT_WR_OFF);
+ writel(reg, ctx->base + INDIRECT_ADDR_OFF);
+ writel(INDIRECT_CMD_WR, ctx->base + INDIRECT_CMD_OFF);
+
+ ret = readl_poll_timeout(ctx->base + INDIRECT_CMD_OFF, ack,
+ (ack & INDIRECT_CMD_ACK) == INDIRECT_CMD_ACK,
+ INDIRECT_INT_US, INDIRECT_TIMEOUT_US);
+ if (ret)
+ dev_err(ctx->dev, "write timed out on reg 0x%x ack 0x%x\n", reg, ack);
+
+ ret2 = indirect_clear_cmd(ctx);
+
+ if (ret)
+ return ret;
+ return ret2;
+}
+
+static const struct regmap_range m10bmc_pmci_regmap_range[] = {
+ regmap_reg_range(M10BMC_N6000_SYS_BASE, M10BMC_N6000_SYS_END),
+};
+
+static const struct regmap_access_table m10bmc_pmci_access_table = {
+ .yes_ranges = m10bmc_pmci_regmap_range,
+ .n_yes_ranges = ARRAY_SIZE(m10bmc_pmci_regmap_range),
+};
+
+static struct regmap_config m10bmc_pmci_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .wr_table = &m10bmc_pmci_access_table,
+ .rd_table = &m10bmc_pmci_access_table,
+ .reg_read = &indirect_reg_read,
+ .reg_write = &indirect_reg_write,
+ .max_register = M10BMC_N6000_SYS_END,
+};
+
+static struct mfd_cell m10bmc_pmci_n6000_bmc_subdevs[] = {
+ { .name = "n6000bmc-hwmon" },
+};
+
+static const struct m10bmc_csr_map m10bmc_n6000_csr_map = {
+ .base = M10BMC_N6000_SYS_BASE,
+ .build_version = M10BMC_N6000_BUILD_VER,
+ .fw_version = NIOS2_N6000_FW_VERSION,
+ .mac_low = M10BMC_N6000_MAC_LOW,
+ .mac_high = M10BMC_N6000_MAC_HIGH,
+ .doorbell = M10BMC_N6000_DOORBELL,
+ .auth_result = M10BMC_N6000_AUTH_RESULT,
+ .bmc_prog_addr = M10BMC_N6000_BMC_PROG_ADDR,
+ .bmc_reh_addr = M10BMC_N6000_BMC_REH_ADDR,
+ .bmc_magic = M10BMC_N6000_BMC_PROG_MAGIC,
+ .sr_prog_addr = M10BMC_N6000_SR_PROG_ADDR,
+ .sr_reh_addr = M10BMC_N6000_SR_REH_ADDR,
+ .sr_magic = M10BMC_N6000_SR_PROG_MAGIC,
+ .pr_prog_addr = M10BMC_N6000_PR_PROG_ADDR,
+ .pr_reh_addr = M10BMC_N6000_PR_REH_ADDR,
+ .pr_magic = M10BMC_N6000_PR_PROG_MAGIC,
+ .rsu_update_counter = M10BMC_N6000_STAGING_FLASH_COUNT,
+};
+
+static const struct intel_m10bmc_platform_info m10bmc_pmci_n6000 = {
+ .cells = m10bmc_pmci_n6000_bmc_subdevs,
+ .n_cells = ARRAY_SIZE(m10bmc_pmci_n6000_bmc_subdevs),
+ .csr_map = &m10bmc_n6000_csr_map,
+};
+
+static int m10bmc_pmci_probe(struct dfl_device *ddev)
+{
+ struct device *dev = &ddev->dev;
+ struct m10bmc_pmci_device *pmci;
+ struct indirect_ctx *ctx;
+
+ pmci = devm_kzalloc(dev, sizeof(*pmci), GFP_KERNEL);
+ if (!pmci)
+ return -ENOMEM;
+
+ pmci->m10bmc.dev = dev;
+
+ pmci->base = devm_ioremap_resource(dev, &ddev->mmio_res);
+ if (IS_ERR(pmci->base))
+ return PTR_ERR(pmci->base);
+
+ ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->base = pmci->base + M10BMC_N6000_INDIRECT_BASE;
+ ctx->dev = dev;
+ indirect_clear_cmd(ctx);
+ pmci->m10bmc.regmap = devm_regmap_init(dev, NULL, ctx, &m10bmc_pmci_regmap_config);
+
+ if (IS_ERR(pmci->m10bmc.regmap))
+ return PTR_ERR(pmci->m10bmc.regmap);
+
+ return m10bmc_dev_init(&pmci->m10bmc, &m10bmc_pmci_n6000);
+}
+
+#define FME_FEATURE_ID_M10BMC_PMCI 0x12
+
+static const struct dfl_device_id m10bmc_pmci_ids[] = {
+ { FME_ID, FME_FEATURE_ID_M10BMC_PMCI },
+ { }
+};
+MODULE_DEVICE_TABLE(dfl, m10bmc_pmci_ids);
+
+static struct dfl_driver m10bmc_pmci_driver = {
+ .drv = {
+ .name = "intel-m10-bmc",
+ .dev_groups = m10bmc_dev_groups,
+ },
+ .id_table = m10bmc_pmci_ids,
+ .probe = m10bmc_pmci_probe,
+};
+
+module_dfl_driver(m10bmc_pmci_driver);
+
+MODULE_DESCRIPTION("MAX10 BMC PMCI-based interface");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL");
projects / platform / kernel / linux-starfive.git / commitdiff