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path: root/drivers/mfd/intel-m10-bmc-pmci.c
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Diffstat (limited to 'drivers/mfd/intel-m10-bmc-pmci.c')
-rw-r--r--drivers/mfd/intel-m10-bmc-pmci.c456
1 files changed, 456 insertions, 0 deletions
diff --git a/drivers/mfd/intel-m10-bmc-pmci.c b/drivers/mfd/intel-m10-bmc-pmci.c
new file mode 100644
index 0000000000..0392ef8b57
--- /dev/null
+++ b/drivers/mfd/intel-m10-bmc-pmci.c
@@ -0,0 +1,456 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * MAX10 BMC Platform Management Component Interface (PMCI) based
+ * interface.
+ *
+ * Copyright (C) 2020-2023 Intel Corporation.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/device.h>
+#include <linux/dfl.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/intel-m10-bmc.h>
+#include <linux/minmax.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+struct m10bmc_pmci_device {
+ void __iomem *base;
+ struct intel_m10bmc m10bmc;
+ struct mutex flash_mutex; /* protects flash_busy and serializes flash read/read */
+ bool flash_busy;
+};
+
+/*
+ * 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 void pmci_write_fifo(void __iomem *base, const u32 *buf, size_t count)
+{
+ while (count--)
+ writel(*buf++, base);
+}
+
+static void pmci_read_fifo(void __iomem *base, u32 *buf, size_t count)
+{
+ while (count--)
+ *buf++ = readl(base);
+}
+
+static u32 pmci_get_write_space(struct m10bmc_pmci_device *pmci)
+{
+ u32 val;
+ int ret;
+
+ ret = read_poll_timeout(readl, val,
+ FIELD_GET(M10BMC_N6000_FLASH_FIFO_SPACE, val) ==
+ M10BMC_N6000_FIFO_MAX_WORDS,
+ M10BMC_FLASH_INT_US, M10BMC_FLASH_TIMEOUT_US,
+ false, pmci->base + M10BMC_N6000_FLASH_CTRL);
+ if (ret == -ETIMEDOUT)
+ return 0;
+
+ return FIELD_GET(M10BMC_N6000_FLASH_FIFO_SPACE, val) * M10BMC_N6000_FIFO_WORD_SIZE;
+}
+
+static int pmci_flash_bulk_write(struct intel_m10bmc *m10bmc, const u8 *buf, u32 size)
+{
+ struct m10bmc_pmci_device *pmci = container_of(m10bmc, struct m10bmc_pmci_device, m10bmc);
+ u32 blk_size, offset = 0, write_count;
+
+ while (size) {
+ blk_size = min(pmci_get_write_space(pmci), size);
+ if (blk_size == 0) {
+ dev_err(m10bmc->dev, "get FIFO available size fail\n");
+ return -EIO;
+ }
+
+ if (size < M10BMC_N6000_FIFO_WORD_SIZE)
+ break;
+
+ write_count = blk_size / M10BMC_N6000_FIFO_WORD_SIZE;
+ pmci_write_fifo(pmci->base + M10BMC_N6000_FLASH_FIFO,
+ (u32 *)(buf + offset), write_count);
+
+ size -= blk_size;
+ offset += blk_size;
+ }
+
+ /* Handle remainder (less than M10BMC_N6000_FIFO_WORD_SIZE bytes) */
+ if (size) {
+ u32 tmp = 0;
+
+ memcpy(&tmp, buf + offset, size);
+ pmci_write_fifo(pmci->base + M10BMC_N6000_FLASH_FIFO, &tmp, 1);
+ }
+
+ return 0;
+}
+
+static int pmci_flash_bulk_read(struct intel_m10bmc *m10bmc, u8 *buf, u32 addr, u32 size)
+{
+ struct m10bmc_pmci_device *pmci = container_of(m10bmc, struct m10bmc_pmci_device, m10bmc);
+ u32 blk_size, offset = 0, val, full_read_count, read_count;
+ int ret;
+
+ while (size) {
+ blk_size = min_t(u32, size, M10BMC_N6000_READ_BLOCK_SIZE);
+ full_read_count = blk_size / M10BMC_N6000_FIFO_WORD_SIZE;
+
+ read_count = full_read_count;
+ if (full_read_count * M10BMC_N6000_FIFO_WORD_SIZE < blk_size)
+ read_count++;
+
+ writel(addr + offset, pmci->base + M10BMC_N6000_FLASH_ADDR);
+ writel(FIELD_PREP(M10BMC_N6000_FLASH_READ_COUNT, read_count) |
+ M10BMC_N6000_FLASH_RD_MODE,
+ pmci->base + M10BMC_N6000_FLASH_CTRL);
+
+ ret = readl_poll_timeout((pmci->base + M10BMC_N6000_FLASH_CTRL), val,
+ !(val & M10BMC_N6000_FLASH_BUSY),
+ M10BMC_FLASH_INT_US, M10BMC_FLASH_TIMEOUT_US);
+ if (ret) {
+ dev_err(m10bmc->dev, "read timed out on reading flash 0x%xn", val);
+ return ret;
+ }
+
+ pmci_read_fifo(pmci->base + M10BMC_N6000_FLASH_FIFO,
+ (u32 *)(buf + offset), full_read_count);
+
+ size -= blk_size;
+ offset += blk_size;
+
+ if (full_read_count < read_count)
+ break;
+
+ writel(0, pmci->base + M10BMC_N6000_FLASH_CTRL);
+ }
+
+ /* Handle remainder (less than M10BMC_N6000_FIFO_WORD_SIZE bytes) */
+ if (size) {
+ u32 tmp;
+
+ pmci_read_fifo(pmci->base + M10BMC_N6000_FLASH_FIFO, &tmp, 1);
+ memcpy(buf + offset, &tmp, size);
+
+ writel(0, pmci->base + M10BMC_N6000_FLASH_CTRL);
+ }
+
+ return 0;
+}
+
+static int m10bmc_pmci_set_flash_host_mux(struct intel_m10bmc *m10bmc, bool request)
+{
+ u32 ctrl;
+ int ret;
+
+ ret = regmap_update_bits(m10bmc->regmap, M10BMC_N6000_FLASH_MUX_CTRL,
+ M10BMC_N6000_FLASH_HOST_REQUEST,
+ FIELD_PREP(M10BMC_N6000_FLASH_HOST_REQUEST, request));
+ if (ret)
+ return ret;
+
+ return regmap_read_poll_timeout(m10bmc->regmap,
+ M10BMC_N6000_FLASH_MUX_CTRL, ctrl,
+ request ?
+ (get_flash_mux(ctrl) == M10BMC_N6000_FLASH_MUX_HOST) :
+ (get_flash_mux(ctrl) != M10BMC_N6000_FLASH_MUX_HOST),
+ M10BMC_FLASH_INT_US, M10BMC_FLASH_TIMEOUT_US);
+}
+
+static int m10bmc_pmci_flash_read(struct intel_m10bmc *m10bmc, u8 *buf, u32 addr, u32 size)
+{
+ struct m10bmc_pmci_device *pmci = container_of(m10bmc, struct m10bmc_pmci_device, m10bmc);
+ int ret, ret2;
+
+ mutex_lock(&pmci->flash_mutex);
+ if (pmci->flash_busy) {
+ ret = -EBUSY;
+ goto unlock;
+ }
+
+ ret = m10bmc_pmci_set_flash_host_mux(m10bmc, true);
+ if (ret)
+ goto mux_fail;
+
+ ret = pmci_flash_bulk_read(m10bmc, buf, addr, size);
+
+mux_fail:
+ ret2 = m10bmc_pmci_set_flash_host_mux(m10bmc, false);
+
+unlock:
+ mutex_unlock(&pmci->flash_mutex);
+ if (ret)
+ return ret;
+ return ret2;
+}
+
+static int m10bmc_pmci_flash_write(struct intel_m10bmc *m10bmc, const u8 *buf, u32 offset, u32 size)
+{
+ struct m10bmc_pmci_device *pmci = container_of(m10bmc, struct m10bmc_pmci_device, m10bmc);
+ int ret;
+
+ mutex_lock(&pmci->flash_mutex);
+ WARN_ON_ONCE(!pmci->flash_busy);
+ /* On write, firmware manages flash MUX */
+ ret = pmci_flash_bulk_write(m10bmc, buf + offset, size);
+ mutex_unlock(&pmci->flash_mutex);
+
+ return ret;
+}
+
+static int m10bmc_pmci_flash_lock(struct intel_m10bmc *m10bmc)
+{
+ struct m10bmc_pmci_device *pmci = container_of(m10bmc, struct m10bmc_pmci_device, m10bmc);
+ int ret = 0;
+
+ mutex_lock(&pmci->flash_mutex);
+ if (pmci->flash_busy) {
+ ret = -EBUSY;
+ goto unlock;
+ }
+
+ pmci->flash_busy = true;
+
+unlock:
+ mutex_unlock(&pmci->flash_mutex);
+ return ret;
+}
+
+static void m10bmc_pmci_flash_unlock(struct intel_m10bmc *m10bmc)
+{
+ struct m10bmc_pmci_device *pmci = container_of(m10bmc, struct m10bmc_pmci_device, m10bmc);
+
+ mutex_lock(&pmci->flash_mutex);
+ WARN_ON_ONCE(!pmci->flash_busy);
+ pmci->flash_busy = false;
+ mutex_unlock(&pmci->flash_mutex);
+}
+
+static const struct intel_m10bmc_flash_bulk_ops m10bmc_pmci_flash_bulk_ops = {
+ .read = m10bmc_pmci_flash_read,
+ .write = m10bmc_pmci_flash_write,
+ .lock_write = m10bmc_pmci_flash_lock,
+ .unlock_write = m10bmc_pmci_flash_unlock,
+};
+
+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" },
+ { .name = "n6000bmc-sec-update" },
+};
+
+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;
+ int ret;
+
+ pmci = devm_kzalloc(dev, sizeof(*pmci), GFP_KERNEL);
+ if (!pmci)
+ return -ENOMEM;
+
+ pmci->m10bmc.flash_bulk_ops = &m10bmc_pmci_flash_bulk_ops;
+ 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;
+
+ mutex_init(&pmci->flash_mutex);
+
+ 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)) {
+ ret = PTR_ERR(pmci->m10bmc.regmap);
+ goto destroy_mutex;
+ }
+
+ ret = m10bmc_dev_init(&pmci->m10bmc, &m10bmc_pmci_n6000);
+ if (ret)
+ goto destroy_mutex;
+ return 0;
+
+destroy_mutex:
+ mutex_destroy(&pmci->flash_mutex);
+ return ret;
+}
+
+static void m10bmc_pmci_remove(struct dfl_device *ddev)
+{
+ struct intel_m10bmc *m10bmc = dev_get_drvdata(&ddev->dev);
+ struct m10bmc_pmci_device *pmci = container_of(m10bmc, struct m10bmc_pmci_device, m10bmc);
+
+ mutex_destroy(&pmci->flash_mutex);
+}
+
+#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,
+ .remove = m10bmc_pmci_remove,
+};
+
+module_dfl_driver(m10bmc_pmci_driver);
+
+MODULE_DESCRIPTION("MAX10 BMC PMCI-based interface");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(INTEL_M10_BMC_CORE);