[PATCH linux dev-4.10 3/6] drivers/misc: Add driver for Aspeed PECI and generic PECI headers
Jae Hyun Yoo
jae.hyun.yoo at linux.intel.com
Tue Jan 9 14:31:23 PST 2018
This commit adds driver implementation for Aspeed PECI. Also adds
generic peci.h and peci_ioctl.h files to provide compatibility
to peci drivers that can be implemented later e.g. Nuvoton's BMC
SoC family.
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo at linux.intel.com>
---
drivers/misc/Kconfig | 9 +
drivers/misc/Makefile | 1 +
drivers/misc/aspeed-peci.c | 1130 +++++++++++++++++++++++++++++++++++++++
include/misc/peci.h | 11 +
include/uapi/linux/Kbuild | 1 +
include/uapi/linux/peci_ioctl.h | 270 ++++++++++
6 files changed, 1422 insertions(+)
create mode 100644 drivers/misc/aspeed-peci.c
create mode 100644 include/misc/peci.h
create mode 100644 include/uapi/linux/peci_ioctl.h
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 02ffdd1..96e1e04 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -782,6 +782,15 @@ config ASPEED_LPC_SNOOP
allows the BMC to listen on and save the data written by
the host to an arbitrary LPC I/O port.
+config ASPEED_PECI
+ tristate "Aspeed AST2400/AST2500 PECI support"
+ select CRC8
+ select REGMAP_MMIO
+ depends on ARCH_ASPEED || COMPILE_TEST
+ help
+ Provides a driver for Platform Environment Control Interface (PECI)
+ controller on Aspeed AST2400/AST2500 SoC.
+
source "drivers/misc/c2port/Kconfig"
source "drivers/misc/eeprom/Kconfig"
source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index ab8af76..8a22455 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -55,6 +55,7 @@ obj-$(CONFIG_CXL_BASE) += cxl/
obj-$(CONFIG_PANEL) += panel.o
obj-$(CONFIG_ASPEED_LPC_CTRL) += aspeed-lpc-ctrl.o
obj-$(CONFIG_ASPEED_LPC_SNOOP) += aspeed-lpc-snoop.o
+obj-$(CONFIG_ASPEED_PECI) += aspeed-peci.o
lkdtm-$(CONFIG_LKDTM) += lkdtm_core.o
lkdtm-$(CONFIG_LKDTM) += lkdtm_bugs.o
diff --git a/drivers/misc/aspeed-peci.c b/drivers/misc/aspeed-peci.c
new file mode 100644
index 0000000..04fb794
--- /dev/null
+++ b/drivers/misc/aspeed-peci.c
@@ -0,0 +1,1130 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2012-2020 ASPEED Technology Inc.
+// Copyright (c) 2017 Intel Corporation
+
+#include <linux/clk.h>
+#include <linux/crc8.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/mfd/syscon.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/peci_ioctl.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/semaphore.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+
+#define SOC_NAME "aspeed"
+#define DEVICE_NAME "peci"
+
+#define DUMP_DEBUG 0
+
+/* Aspeed PECI Registers */
+#define AST_PECI_CTRL 0x00
+#define AST_PECI_TIMING 0x04
+#define AST_PECI_CMD 0x08
+#define AST_PECI_CMD_CTRL 0x0c
+#define AST_PECI_EXP_FCS 0x10
+#define AST_PECI_CAP_FCS 0x14
+#define AST_PECI_INT_CTRL 0x18
+#define AST_PECI_INT_STS 0x1c
+#define AST_PECI_W_DATA0 0x20
+#define AST_PECI_W_DATA1 0x24
+#define AST_PECI_W_DATA2 0x28
+#define AST_PECI_W_DATA3 0x2c
+#define AST_PECI_R_DATA0 0x30
+#define AST_PECI_R_DATA1 0x34
+#define AST_PECI_R_DATA2 0x38
+#define AST_PECI_R_DATA3 0x3c
+#define AST_PECI_W_DATA4 0x40
+#define AST_PECI_W_DATA5 0x44
+#define AST_PECI_W_DATA6 0x48
+#define AST_PECI_W_DATA7 0x4c
+#define AST_PECI_R_DATA4 0x50
+#define AST_PECI_R_DATA5 0x54
+#define AST_PECI_R_DATA6 0x58
+#define AST_PECI_R_DATA7 0x5c
+
+/* AST_PECI_CTRL - 0x00 : Control Register */
+#define PECI_CTRL_SAMPLING_MASK GENMASK(19, 16)
+#define PECI_CTRL_SAMPLING(x) ((x << 16) & PECI_CTRL_SAMPLING_MASK)
+#define PECI_CTRL_SAMPLING_GET(x) ((x & PECI_CTRL_SAMPLING_MASK) >> 16)
+#define PECI_CTRL_READ_MODE_MASK GENMASK(13, 12)
+#define PECI_CTRL_READ_MODE(x) ((x << 12) & PECI_CTRL_READ_MODE_MASK)
+#define PECI_CTRL_READ_MODE_GET(x) ((x & PECI_CTRL_READ_MODE_MASK) >> 12)
+#define PECI_CTRL_READ_MODE_COUNT BIT(12)
+#define PECI_CTRL_READ_MODE_DBG BIT(13)
+#define PECI_CTRL_CLK_SOURCE_MASK BIT(11)
+#define PECI_CTRL_CLK_SOURCE(x) ((x << 11) & PECI_CTRL_CLK_SOURCE_MASK)
+#define PECI_CTRL_CLK_SOURCE_GET(x) ((x & PECI_CTRL_CLK_SOURCE_MASK) >> 11)
+#define PECI_CTRL_CLK_DIV_MASK GENMASK(10, 8)
+#define PECI_CTRL_CLK_DIV(x) ((x << 8) & PECI_CTRL_CLK_DIV_MASK)
+#define PECI_CTRL_CLK_DIV_GET(x) ((x & PECI_CTRL_CLK_DIV_MASK) >> 8)
+#define PECI_CTRL_INVERT_OUT BIT(7)
+#define PECI_CTRL_INVERT_IN BIT(6)
+#define PECI_CTRL_BUS_CONTENT_EN BIT(5)
+#define PECI_CTRL_PECI_EN BIT(4)
+#define PECI_CTRL_PECI_CLK_EN BIT(0)
+
+/* AST_PECI_TIMING - 0x04 : Timing Negotiation Register */
+#define PECI_TIMING_MESSAGE_MASK GENMASK(15, 8)
+#define PECI_TIMING_MESSAGE(x) ((x << 8) & PECI_TIMING_MESSAGE_MASK)
+#define PECI_TIMING_MESSAGE_GET(x) ((x & PECI_TIMING_MESSAGE_MASK) >> 8)
+#define PECI_TIMING_ADDRESS_MASK GENMASK(7, 0)
+#define PECI_TIMING_ADDRESS(x) (x & PECI_TIMING_ADDRESS_MASK)
+#define PECI_TIMING_ADDRESS_GET(x) (x & PECI_TIMING_ADDRESS_MASK)
+
+/* AST_PECI_CMD - 0x08 : Command Register */
+#define PECI_CMD_PIN_MON BIT(31)
+#define PECI_CMD_STS_MASK GENMASK(27, 24)
+#define PECI_CMD_STS_GET(x) ((x & PECI_CMD_STS_MASK) >> 24)
+#define PECI_CMD_FIRE BIT(0)
+
+/* AST_PECI_LEN - 0x0C : Read/Write Length Register */
+#define PECI_AW_FCS_EN BIT(31)
+#define PECI_READ_LEN_MASK GENMASK(23, 16)
+#define PECI_READ_LEN(x) ((x << 16) & PECI_READ_LEN_MASK)
+#define PECI_WRITE_LEN_MASK GENMASK(15, 8)
+#define PECI_WRITE_LEN(x) ((x << 8) & PECI_WRITE_LEN_MASK)
+#define PECI_TAGET_ADDR_MASK GENMASK(7, 0)
+#define PECI_TAGET_ADDR(x) ((x) & PECI_TAGET_ADDR_MASK)
+
+/* AST_PECI_EXP_FCS - 0x10 : Expected FCS Data Register */
+#define PECI_EXPECT_READ_FCS_MASK GENMASK(23, 16)
+#define PECI_EXPECT_READ_FCS_GET(x) ((x & PECI_EXPECT_READ_FCS_MASK) >> 16)
+#define PECI_EXPECT_AW_FCS_AUTO_MASK GENMASK(15, 8)
+#define PECI_EXPECT_AW_FCS_AUTO_GET(x) ((x & PECI_EXPECT_AW_FCS_AUTO_MASK) >> 8)
+#define PECI_EXPECT_WRITE_FCS_MASK GENMASK(7, 0)
+#define PECI_EXPECT_WRITE_FCS_GET(x) (x & PECI_EXPECT_WRITE_FCS_MASK)
+
+/* AST_PECI_CAP_FCS - 0x14 : Captured FCS Data Register */
+#define PECI_CAPTURE_READ_FCS_MASK GENMASK(23, 16)
+#define PECI_CAPTURE_READ_FCS_GET(x) ((x & PECI_CAPTURE_READ_FCS_MASK) >> 16)
+#define PECI_CAPTURE_WRITE_FCS_MASK GENMASK(7, 0)
+#define PECI_CAPTURE_WRITE_FCS_GET(x) (x & PECI_CAPTURE_WRITE_FCS_MASK)
+
+/* AST_PECI_INT_CTRL/STS - 0x18/0x1c : Interrupt Register */
+#define PECI_INT_TIMING_RESULT_MASK GENMASK(31, 30)
+#define PECI_INT_TIMEOUT BIT(4)
+#define PECI_INT_CONNECT BIT(3)
+#define PECI_INT_W_FCS_BAD BIT(2)
+#define PECI_INT_W_FCS_ABORT BIT(1)
+#define PECI_INT_CMD_DONE BIT(0)
+
+struct aspeed_peci {
+ struct miscdevice miscdev;
+ struct device *dev;
+ struct regmap *regmap;
+ atomic_t ref_count;
+ int irq;
+ struct completion xfer_complete;
+ u32 sts;
+ u32 cmd_timeout_ms;
+ bool initialized;
+ bool cmd_support[PECI_CMD_MAX];
+ struct mutex mutex;
+};
+
+#define PECI_INT_MASK (PECI_INT_TIMEOUT | PECI_INT_CONNECT | \
+ PECI_INT_W_FCS_BAD | PECI_INT_W_FCS_ABORT | \
+ PECI_INT_CMD_DONE)
+
+#define PECI_IDLE_CHECK_TIMEOUT 5
+
+#define PECI_RD_SAMPLING_POINT_DEFAULT 8
+#define PECI_RD_SAMPLING_POINT_MAX 15
+#define PECI_CLK_DIV_DEFAULT 0
+#define PECI_CLK_DIV_MAX 7
+#define PECI_MSG_TIMING_NEGO_DEFAULT 1
+#define PECI_MSG_TIMING_NEGO_MAX 255
+#define PECI_ADDR_TIMING_NEGO_DEFAULT 1
+#define PECI_ADDR_TIMING_NEGO_MAX 255
+#define PECI_CMD_TIMEOUT_MS_DEFAULT 1000
+#define PECI_CMD_TIMEOUT_MS_MAX 60000
+
+#define PECI_CRC8_POLYNOMIAL 0x07
+
+DECLARE_CRC8_TABLE(aspeed_peci_crc8_table);
+
+static struct aspeed_peci *aspeed_peci_priv;
+
+
+static u8 compute_aw_fcs(u8 *data, int len)
+{
+ return crc8(aspeed_peci_crc8_table, data, (size_t)len, 0);
+}
+
+static int ioctl_xfer_msg(struct aspeed_peci *priv, void *pmsg)
+{
+ struct peci_xfer_msg *pumsg = pmsg;
+ u32 peci_head;
+ u32 peci_state;
+ u32 rx_data;
+ uint reg;
+ long timeout;
+ int i;
+ int rc = 0;
+
+ reinit_completion(&priv->xfer_complete);
+
+ peci_head = PECI_TAGET_ADDR(pumsg->client_addr) |
+ PECI_WRITE_LEN(pumsg->tx_len) |
+ PECI_READ_LEN(pumsg->rx_len);
+
+ rc = regmap_write(priv->regmap, AST_PECI_CMD_CTRL, peci_head);
+ if (rc)
+ return rc;
+
+ for (i = 0; i < pumsg->tx_len; i += 4) {
+ reg = i < 16 ? AST_PECI_W_DATA0 + i % 16 :
+ AST_PECI_W_DATA4 + i % 16;
+ rc = regmap_write(priv->regmap, reg,
+ (pumsg->tx_buf[i + 3] << 24) |
+ (pumsg->tx_buf[i + 2] << 16) |
+ (pumsg->tx_buf[i + 1] << 8) |
+ pumsg->tx_buf[i + 0]);
+ if (rc)
+ return rc;
+ }
+
+ dev_dbg(priv->dev, "HEAD : 0x%08x\n", peci_head);
+#if DUMP_DEBUG
+ print_hex_dump(KERN_DEBUG, "TX : ", DUMP_PREFIX_NONE, 16, 1,
+ pumsg->tx_buf, pumsg->tx_len, true);
+#endif
+
+ rc = regmap_write(priv->regmap, AST_PECI_CMD, PECI_CMD_FIRE);
+ if (rc)
+ return rc;
+
+ timeout = wait_for_completion_interruptible_timeout(
+ &priv->xfer_complete,
+ msecs_to_jiffies(priv->cmd_timeout_ms));
+
+ dev_dbg(priv->dev, "INT_STS : 0x%08x\n", priv->sts);
+ if (!regmap_read(priv->regmap, AST_PECI_CMD, &peci_state))
+ dev_dbg(priv->dev, "PECI_STATE : 0x%lx\n",
+ PECI_CMD_STS_GET(peci_state));
+ else
+ dev_dbg(priv->dev, "PECI_STATE : read error\n");
+
+ if (timeout <= 0 || !(priv->sts & PECI_INT_CMD_DONE)) {
+ if (timeout <= 0) {
+ dev_dbg(priv->dev, "Timeout waiting for a response!\n");
+ rc = -ETIME;
+ } else {
+ dev_dbg(priv->dev, "No valid response!\n");
+ rc = -EFAULT;
+ }
+ return rc;
+ }
+
+ for (i = 0; i < pumsg->rx_len; i++) {
+ u8 byte_offset = i % 4;
+
+ if (byte_offset == 0) {
+ reg = i < 16 ? AST_PECI_R_DATA0 + i % 16 :
+ AST_PECI_R_DATA4 + i % 16;
+ rc = regmap_read(priv->regmap, reg, &rx_data);
+ if (rc)
+ return rc;
+ }
+
+ pumsg->rx_buf[i] = (u8)(rx_data >> (byte_offset << 3));
+ }
+
+#if DUMP_DEBUG
+ print_hex_dump(KERN_DEBUG, "RX : ", DUMP_PREFIX_NONE, 16, 1,
+ pumsg->rx_buf, pumsg->rx_len, true);
+#endif
+ if (!regmap_read(priv->regmap, AST_PECI_CMD, &peci_state))
+ dev_dbg(priv->dev, "PECI_STATE : 0x%lx\n",
+ PECI_CMD_STS_GET(peci_state));
+ else
+ dev_dbg(priv->dev, "PECI_STATE : read error\n");
+ dev_dbg(priv->dev, "------------------------\n");
+
+ return rc;
+}
+
+static int
+xfer_msg_with_retries(struct aspeed_peci *priv, void *pmsg, bool has_aw_fcs)
+{
+ struct peci_xfer_msg *pumsg = pmsg;
+ uint retries = DEV_PECI_RETRY_ATTEMPTS;
+ int rc = 0;
+
+ /* Per the PECI spec, need to retry any commands that return 0x8x */
+ do {
+ rc = ioctl_xfer_msg(priv, pumsg);
+ if (!(!rc && ((pumsg->rx_buf[0] & DEV_PECI_CC_RETRY_ERR_MASK) ==
+ DEV_PECI_CC_TIMEOUT)))
+ break;
+
+ /* Set the retry bit to indicate a retry attempt */
+ pumsg->tx_buf[1] |= DEV_PECI_RETRY_BIT;
+
+ /* Recalculate the AW FCS if it has one */
+ if (has_aw_fcs)
+ pumsg->tx_buf[pumsg->tx_len - 1] = 0x80 ^
+ compute_aw_fcs((u8 *)pumsg,
+ 2 + pumsg->tx_len);
+
+ /*
+ * Retry for at least 250ms before returning an error.
+ * Retry interval guideline:
+ * No minimum < Retry Interval < No maximum
+ * (recommend 10ms)
+ */
+ usleep_range(DEV_PECI_RETRY_DELAY_MS * 1000,
+ (DEV_PECI_RETRY_DELAY_MS * 1000) + 1000);
+ } while (retries--);
+
+ return rc;
+}
+
+static int initialize(struct aspeed_peci *priv)
+{
+ struct peci_xfer_msg msg;
+ u32 dib;
+ int rc = 0;
+
+ /* Initialize it just once. */
+ if (priv->initialized)
+ return 0;
+
+ /* Update command table just once. */
+ if (priv->cmd_support[PECI_CMD_PING])
+ return 0;
+
+ msg.client_addr = PECI_BASE_ADDR;
+ msg.tx_len = GET_DIB_WR_LEN;
+ msg.rx_len = GET_DIB_RD_LEN;
+ msg.tx_buf[0] = GET_DIB_PECI_CMD;
+
+ rc = ioctl_xfer_msg(priv, &msg);
+ if (rc < 0) {
+ dev_dbg(priv->dev, "PECI xfer error, rc : %d\n", rc);
+ return rc;
+ }
+
+ dib = msg.rx_buf[0] | (msg.rx_buf[1] << 8) |
+ (msg.rx_buf[2] << 16) | (msg.rx_buf[3] << 24);
+
+ /* Check special case for Get DIB command */
+ if (dib == 0x00) {
+ dev_dbg(priv->dev, "DIB read as 0x00\n");
+ return -1;
+ }
+
+ if (!rc) {
+ /*
+ * setting up the supporting commands based on minor rev#
+ * see PECI Spec Table 3-1
+ */
+ priv->cmd_support[PECI_CMD_PING] = true;
+ priv->cmd_support[PECI_CMD_GET_TEMP] = true;
+ priv->cmd_support[PECI_CMD_GET_DIB] = true;
+
+ /* get minor rev# */
+ dib = (dib >> 8) & 0xF;
+
+ if (dib >= 0x1) {
+ priv->cmd_support[PECI_CMD_RD_PKG_CFG] = true;
+ priv->cmd_support[PECI_CMD_WR_PKG_CFG] = true;
+ }
+
+ if (dib >= 0x2)
+ priv->cmd_support[PECI_CMD_RD_IA_MSR] = true;
+
+ if (dib >= 0x3) {
+ priv->cmd_support[PECI_CMD_RD_PCI_CFG_LOCAL] = true;
+ priv->cmd_support[PECI_CMD_WR_PCI_CFG_LOCAL] = true;
+ }
+
+ if (dib >= 0x4)
+ priv->cmd_support[PECI_CMD_RD_PCI_CFG] = true;
+
+ if (dib >= 0x5)
+ priv->cmd_support[PECI_CMD_WR_PCI_CFG] = true;
+
+ if (dib >= 0x6)
+ priv->cmd_support[PECI_CMD_WR_IA_MSR] = true;
+
+ priv->initialized = true;
+ } else {
+ dev_dbg(priv->dev, "Error reading DIB, rc : %d\n", rc);
+ }
+
+ return rc;
+}
+
+static int ioctl_ping(struct aspeed_peci *priv, void *pmsg)
+{
+ struct peci_ping_msg *pumsg = pmsg;
+ struct peci_xfer_msg msg;
+ int rc;
+
+ if (!priv->initialized && initialize(priv) < 0) {
+ dev_dbg(priv->dev, "Failed to initialize peci\n");
+ return -EIO;
+ }
+
+ if (!priv->cmd_support[PECI_CMD_PING]) {
+ dev_dbg(priv->dev, "Command is not supported\n");
+ return -EBADRQC;
+ }
+
+ msg.client_addr = pumsg->target;
+ msg.tx_len = 0;
+ msg.rx_len = 0;
+
+ rc = ioctl_xfer_msg(priv, &msg);
+ if (rc < 0)
+ return rc;
+
+ return 0;
+}
+
+static int ioctl_get_dib(struct aspeed_peci *priv, void *pmsg)
+{
+ struct peci_get_dib_msg *pumsg = pmsg;
+ struct peci_xfer_msg msg;
+ int rc;
+
+ if (!priv->initialized && initialize(priv) < 0) {
+ dev_dbg(priv->dev, "Failed to initialize peci\n");
+ return -EIO;
+ }
+
+ if (!priv->cmd_support[PECI_CMD_GET_DIB]) {
+ dev_dbg(priv->dev, "Command is not supported\n");
+ return -EBADRQC;
+ }
+
+ msg.client_addr = pumsg->target;
+ msg.tx_len = GET_DIB_WR_LEN;
+ msg.rx_len = GET_DIB_RD_LEN;
+ msg.tx_buf[0] = GET_DIB_PECI_CMD;
+
+ rc = ioctl_xfer_msg(priv, &msg);
+ if (rc < 0)
+ return rc;
+
+ pumsg->dib = msg.rx_buf[0] | (msg.rx_buf[1] << 8) |
+ (msg.rx_buf[2] << 16) | (msg.rx_buf[3] << 24);
+
+ return 0;
+}
+
+static int ioctl_get_temp(struct aspeed_peci *priv, void *pmsg)
+{
+ struct peci_get_temp_msg *pumsg = pmsg;
+ struct peci_xfer_msg msg;
+ int rc;
+
+ if (!priv->initialized && initialize(priv) < 0) {
+ dev_dbg(priv->dev, "Failed to initialize peci\n");
+ return -EIO;
+ }
+
+ if (!priv->cmd_support[PECI_CMD_GET_TEMP]) {
+ dev_dbg(priv->dev, "Command is not supported\n");
+ return -EBADRQC;
+ }
+
+ msg.client_addr = pumsg->target;
+ msg.tx_len = GET_TEMP_WR_LEN;
+ msg.rx_len = GET_TEMP_RD_LEN;
+ msg.tx_buf[0] = GET_TEMP_PECI_CMD;
+
+ rc = ioctl_xfer_msg(priv, &msg);
+ if (rc < 0)
+ return rc;
+
+ pumsg->temp_raw = (signed short)(msg.rx_buf[0] | (msg.rx_buf[1] << 8));
+
+ return 0;
+}
+
+static int ioctl_rd_pkg_cfg(struct aspeed_peci *priv, void *pmsg)
+{
+ struct peci_rd_pkg_cfg_msg *pumsg = pmsg;
+ struct peci_xfer_msg msg;
+ int rc = 0;
+
+ /* Per the PECI spec, the read length must be a byte, word, or dword */
+ if (pumsg->rx_len != 1 && pumsg->rx_len != 2 && pumsg->rx_len != 4) {
+ dev_dbg(priv->dev, "Invalid read length, rx_len: %d\n",
+ pumsg->rx_len);
+ return -EINVAL;
+ }
+
+ if (!priv->initialized && initialize(priv) < 0) {
+ dev_dbg(priv->dev, "Failed to initialize peci\n");
+ return -EIO;
+ }
+
+ if (!priv->cmd_support[PECI_CMD_RD_PKG_CFG]) {
+ dev_dbg(priv->dev, "Command is not supported\n");
+ return -EBADRQC;
+ }
+
+ msg.client_addr = pumsg->target;
+ msg.tx_len = RDPKGCFG_WRITE_LEN;
+ /* read lengths of 1 and 2 result in an error, so only use 4 for now */
+ msg.rx_len = RDPKGCFG_READ_LEN_BASE + pumsg->rx_len;
+ msg.tx_buf[0] = RDPKGCFG_PECI_CMD;
+ msg.tx_buf[1] = 0x00; /* request byte for Host ID / Retry bit */
+ /* Host ID is 0 for PECI 3.0 */
+ msg.tx_buf[2] = pumsg->index; /* RdPkgConfig index */
+ msg.tx_buf[3] = (u8)pumsg->param; /* LSB - Config parameter */
+ msg.tx_buf[4] = (u8)(pumsg->param >> 8); /* MSB - Config parameter */
+
+ rc = xfer_msg_with_retries(priv, &msg, false);
+ if (rc || msg.rx_buf[0] != DEV_PECI_CC_SUCCESS) {
+ dev_dbg(priv->dev, "ioctl error, rc : %d\n", rc);
+ return -EIO;
+ }
+
+ memcpy(pumsg->pkg_config, &msg.rx_buf[1], pumsg->rx_len);
+
+ return rc;
+}
+
+static int ioctl_wr_pkg_cfg(struct aspeed_peci *priv, void *pmsg)
+{
+ struct peci_wr_pkg_cfg_msg *pumsg = pmsg;
+ struct peci_xfer_msg msg;
+ int rc = 0, i;
+
+ /* Per the PECI spec, the write length must be a dword */
+ if (pumsg->tx_len != 4) {
+ dev_dbg(priv->dev, "Invalid write length, tx_len: %d\n",
+ pumsg->tx_len);
+ return -EINVAL;
+ }
+
+ if (!priv->initialized && initialize(priv) < 0) {
+ dev_dbg(priv->dev, "Failed to initialize peci\n");
+ return -EIO;
+ }
+
+ if (!priv->cmd_support[PECI_CMD_WR_PKG_CFG]) {
+ dev_dbg(priv->dev, "Command is not supported\n");
+ return -EBADRQC;
+ }
+
+ msg.client_addr = pumsg->target;
+ msg.tx_len = WRPKGCFG_WRITE_LEN_BASE + pumsg->tx_len;
+ /* read lengths of 1 and 2 result in an error, so only use 4 for now */
+ msg.rx_len = WRPKGCFG_READ_LEN;
+ msg.tx_buf[0] = WRPKGCFG_PECI_CMD;
+ msg.tx_buf[1] = 0x00; /* request byte for Host ID / Retry bit */
+ /* Host ID is 0 for PECI 3.0 */
+ msg.tx_buf[2] = pumsg->index; /* RdPkgConfig index */
+ msg.tx_buf[3] = (u8)pumsg->param; /* LSB - Config parameter */
+ msg.tx_buf[4] = (u8)(pumsg->param >> 8); /* MSB - Config parameter */
+ for (i = 0; i < pumsg->tx_len; i++)
+ msg.tx_buf[5 + i] = ((u8 *)&pumsg->value)[i];
+
+ /* Add an Assure Write Frame Check Sequence byte */
+ msg.tx_buf[5 + i] = 0x80 ^
+ compute_aw_fcs((u8 *)&msg, 8 + pumsg->tx_len);
+
+ rc = xfer_msg_with_retries(priv, &msg, true);
+ if (rc || msg.rx_buf[0] != DEV_PECI_CC_SUCCESS) {
+ dev_dbg(priv->dev, "ioctl error, rc : %d\n", rc);
+ return -EIO;
+ }
+
+ return rc;
+}
+
+static int ioctl_rd_ia_msr(struct aspeed_peci *priv, void *pmsg)
+{
+ struct peci_rd_ia_msr_msg *pumsg = pmsg;
+ struct peci_xfer_msg msg;
+ int rc = 0;
+
+ if (!priv->initialized && initialize(priv) < 0) {
+ dev_dbg(priv->dev, "Failed to initialize peci\n");
+ return -EIO;
+ }
+
+ if (!priv->cmd_support[PECI_CMD_RD_IA_MSR]) {
+ dev_dbg(priv->dev, "Command is not supported\n");
+ return -EBADRQC;
+ }
+
+ msg.client_addr = pumsg->target;
+ msg.tx_len = RDIAMSR_WRITE_LEN;
+ msg.rx_len = RDIAMSR_READ_LEN;
+ msg.tx_buf[0] = RDIAMSR_PECI_CMD;
+ msg.tx_buf[1] = 0x00;
+ msg.tx_buf[2] = pumsg->thread_id;
+ msg.tx_buf[3] = (u8)pumsg->address;
+ msg.tx_buf[4] = (u8)(pumsg->address >> 8);
+
+ rc = xfer_msg_with_retries(priv, &msg, false);
+ if (rc || msg.rx_buf[0] != DEV_PECI_CC_SUCCESS) {
+ dev_dbg(priv->dev, "ioctl error, rc : %d\n", rc);
+ return -EIO;
+ }
+
+ memcpy(&pumsg->value, &msg.rx_buf[1], sizeof(uint64_t));
+
+ return rc;
+}
+
+static int ioctl_rd_pci_cfg(struct aspeed_peci *priv, void *pmsg)
+{
+ struct peci_rd_pci_cfg_msg *pumsg = pmsg;
+ struct peci_xfer_msg msg;
+ u32 address;
+ int rc = 0;
+
+ if (!priv->initialized && initialize(priv) < 0) {
+ dev_dbg(priv->dev, "Failed to initialize peci\n");
+ return -EIO;
+ }
+
+ if (!priv->cmd_support[PECI_CMD_RD_PCI_CFG]) {
+ dev_dbg(priv->dev, "Command is not supported\n");
+ return -EBADRQC;
+ }
+
+ address = pumsg->reg; /* [11:0] - Register */
+ address |= (u32)pumsg->function << 12; /* [14:12] - Function */
+ address |= (u32)pumsg->device << 15; /* [19:15] - Device */
+ address |= (u32)pumsg->bus << 20; /* [27:20] - Bus */
+ /* [31:28] - Reserved */
+ msg.client_addr = pumsg->target;
+ msg.tx_len = RDPCICFG_WRITE_LEN;
+ msg.rx_len = RDPCICFG_READ_LEN;
+ msg.tx_buf[0] = RDPCICFG_PECI_CMD;
+ msg.tx_buf[1] = 0x00; /* request byte for Host ID / Retry bit */
+ /* Host ID is 0 for PECI 3.0 */
+ msg.tx_buf[2] = (u8)address; /* LSB - PCI Config Address */
+ msg.tx_buf[3] = (u8)(address >> 8); /* PCI Config Address */
+ msg.tx_buf[4] = (u8)(address >> 16); /* PCI Config Address */
+ msg.tx_buf[5] = (u8)(address >> 24); /* MSB - PCI Config Address */
+
+ rc = xfer_msg_with_retries(priv, &msg, false);
+ if (rc || msg.rx_buf[0] != DEV_PECI_CC_SUCCESS) {
+ dev_dbg(priv->dev, "ioctl error, rc : %d\n", rc);
+ return -EIO;
+ }
+
+ memcpy(pumsg->pci_config, &msg.rx_buf[1], 4);
+
+ return rc;
+}
+
+static int ioctl_rd_pci_cfg_local(struct aspeed_peci *priv, void *pmsg)
+{
+ struct peci_rd_pci_cfg_local_msg *pumsg = pmsg;
+ struct peci_xfer_msg msg;
+ u32 address;
+ int rc = 0;
+
+ /* Per the PECI spec, the read length must be a byte, word, or dword */
+ if (pumsg->rx_len != 1 && pumsg->rx_len != 2 && pumsg->rx_len != 4) {
+ dev_dbg(priv->dev, "Invalid read length, rx_len: %d\n",
+ pumsg->rx_len);
+ return -EINVAL;
+ }
+
+ if (!priv->initialized && initialize(priv) < 0) {
+ dev_dbg(priv->dev, "Failed to initialize peci\n");
+ return -EIO;
+ }
+
+ if (!priv->cmd_support[PECI_CMD_RD_PCI_CFG_LOCAL]) {
+ dev_dbg(priv->dev, "Command is not supported\n");
+ return -EBADRQC;
+ }
+
+ address = pumsg->reg; /* [11:0] - Register */
+ address |= (u32)pumsg->function << 12; /* [14:12] - Function */
+ address |= (u32)pumsg->device << 15; /* [19:15] - Device */
+ address |= (u32)pumsg->bus << 20; /* [23:20] - Bus */
+
+ msg.client_addr = pumsg->target;
+ msg.tx_len = RDPCICFGLOCAL_WRITE_LEN;
+ msg.rx_len = RDPCICFGLOCAL_READ_LEN_BASE + pumsg->rx_len;
+ msg.tx_buf[0] = RDPCICFGLOCAL_PECI_CMD;
+ msg.tx_buf[1] = 0x00; /* request byte for Host ID / Retry bit */
+ /* Host ID is 0 for PECI 3.0 */
+ msg.tx_buf[2] = (u8)address; /* LSB - PCI Configuration Address */
+ msg.tx_buf[3] = (u8)(address >> 8); /* PCI Configuration Address */
+ msg.tx_buf[4] = (u8)(address >> 16); /* PCI Configuration Address */
+
+ rc = xfer_msg_with_retries(priv, &msg, false);
+ if (rc || msg.rx_buf[0] != DEV_PECI_CC_SUCCESS) {
+ dev_dbg(priv->dev, "ioctl error, rc : %d\n", rc);
+ return -EIO;
+ }
+
+ memcpy(pumsg->pci_config, &msg.rx_buf[1], pumsg->rx_len);
+
+ return rc;
+}
+
+static int ioctl_wr_pci_cfg_local(struct aspeed_peci *priv, void *pmsg)
+{
+ struct peci_wr_pci_cfg_local_msg *pumsg = pmsg;
+ struct peci_xfer_msg msg;
+ u32 address;
+ int rc = 0, i;
+
+ /* Per the PECI spec, the write length must be a byte, word, or dword */
+ if (pumsg->tx_len != 1 && pumsg->tx_len != 2 && pumsg->tx_len != 4) {
+ dev_dbg(priv->dev, "Invalid write length, tx_len: %d\n",
+ pumsg->tx_len);
+ return -EINVAL;
+ }
+
+ if (!priv->initialized && initialize(priv) < 0) {
+ dev_dbg(priv->dev, "Failed to initialize peci\n");
+ return -EIO;
+ }
+
+ if (!priv->cmd_support[PECI_CMD_RD_PCI_CFG_LOCAL]) {
+ dev_dbg(priv->dev, "Command is not supported\n");
+ return -EBADRQC;
+ }
+
+ address = pumsg->reg; /* [11:0] - Register */
+ address |= (u32)pumsg->function << 12; /* [14:12] - Function */
+ address |= (u32)pumsg->device << 15; /* [19:15] - Device */
+ address |= (u32)pumsg->bus << 20; /* [23:20] - Bus */
+
+ msg.client_addr = pumsg->target;
+ msg.tx_len = WRPCICFGLOCAL_WRITE_LEN_BASE + pumsg->tx_len;
+ msg.rx_len = WRPCICFGLOCAL_READ_LEN;
+ msg.tx_buf[0] = WRPCICFGLOCAL_PECI_CMD;
+ msg.tx_buf[1] = 0x00; /* request byte for Host ID / Retry bit */
+ /* Host ID is 0 for PECI 3.0 */
+ msg.tx_buf[2] = (u8)address; /* LSB - PCI Configuration Address */
+ msg.tx_buf[3] = (u8)(address >> 8); /* PCI Configuration Address */
+ msg.tx_buf[4] = (u8)(address >> 16); /* PCI Configuration Address */
+ for (i = 0; i < pumsg->tx_len; i++)
+ msg.tx_buf[5 + i] = ((u8 *)&pumsg->value)[i];
+
+ /* Add an Assure Write Frame Check Sequence byte */
+ msg.tx_buf[5 + i] = 0x80 ^
+ compute_aw_fcs((u8 *)&msg, 8 + pumsg->tx_len);
+
+ rc = xfer_msg_with_retries(priv, &msg, true);
+ if (rc || msg.rx_buf[0] != DEV_PECI_CC_SUCCESS) {
+ dev_dbg(priv->dev, "ioctl error, rc : %d\n", rc);
+ return -EIO;
+ }
+
+ return rc;
+}
+
+
+typedef int (*ioctl_fn)(struct aspeed_peci *, void *);
+
+static ioctl_fn peci_ioctl_fn[PECI_CMD_MAX] = {
+ ioctl_xfer_msg,
+ ioctl_ping,
+ ioctl_get_dib,
+ ioctl_get_temp,
+ ioctl_rd_pkg_cfg,
+ ioctl_wr_pkg_cfg,
+ ioctl_rd_ia_msr,
+ NULL, /* Reserved */
+ ioctl_rd_pci_cfg,
+ NULL, /* Reserved */
+ ioctl_rd_pci_cfg_local,
+ ioctl_wr_pci_cfg_local,
+};
+
+
+long peci_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ struct aspeed_peci *priv;
+ long ret = 0;
+ void __user *argp = (void __user *)arg;
+ int timeout = PECI_IDLE_CHECK_TIMEOUT;
+ u8 msg[sizeof(struct peci_xfer_msg)];
+ unsigned int peci_cmd, msg_size;
+ u32 cmd_sts;
+
+ /*
+ * Treat it as an inter module call when filp is null but only in case
+ * the private data is initialized.
+ */
+ if (filp)
+ priv = container_of(filp->private_data,
+ struct aspeed_peci, miscdev);
+ else
+ priv = aspeed_peci_priv;
+
+ if (!priv)
+ return -ENXIO;
+
+ switch (cmd) {
+ case PECI_IOC_XFER:
+ case PECI_IOC_PING:
+ case PECI_IOC_GET_DIB:
+ case PECI_IOC_GET_TEMP:
+ case PECI_IOC_RD_PKG_CFG:
+ case PECI_IOC_WR_PKG_CFG:
+ case PECI_IOC_RD_IA_MSR:
+ case PECI_IOC_RD_PCI_CFG:
+ case PECI_IOC_RD_PCI_CFG_LOCAL:
+ case PECI_IOC_WR_PCI_CFG_LOCAL:
+ peci_cmd = _IOC_TYPE(cmd) - PECI_IOC_BASE;
+ msg_size = _IOC_SIZE(cmd);
+ break;
+
+ default:
+ dev_dbg(priv->dev, "Invalid ioctl cmd : 0x%08x\n", cmd);
+ return -EINVAL;
+ }
+
+ if (!peci_ioctl_fn[peci_cmd])
+ return -EPERM;
+
+ mutex_lock(&priv->mutex);
+
+ dev_dbg(priv->dev, "CMD : 0x%08x, peci_cmd : %d, msg_size : %d\n",
+ cmd, peci_cmd, msg_size);
+
+ /* Check command sts and bus idle state */
+ while (!regmap_read(priv->regmap, AST_PECI_CMD, &cmd_sts)
+ && (cmd_sts & (PECI_CMD_STS_MASK | PECI_CMD_PIN_MON))) {
+ if (timeout-- < 0) {
+ dev_dbg(priv->dev, "Timeout waiting for idle state!\n");
+ ret = -ETIME;
+ goto out;
+ }
+ usleep_range(10000, 11000);
+ };
+
+ if (msg_size &&
+ (filp ? copy_from_user(&msg, argp, msg_size) :
+ memcpy(&msg, (const void *)arg, msg_size) != &msg)) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ ret = peci_ioctl_fn[peci_cmd](priv, &msg);
+
+ if (ret == 0 && msg_size &&
+ (filp ? copy_to_user(argp, &msg, msg_size) :
+ memcpy((void *)arg, &msg, msg_size) != (void *)arg))
+ ret = -EFAULT;
+
+out:
+ mutex_unlock(&priv->mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(peci_ioctl);
+
+static int aspeed_peci_open(struct inode *inode, struct file *filp)
+{
+ struct aspeed_peci *priv =
+ container_of(filp->private_data, struct aspeed_peci, miscdev);
+
+ atomic_inc(&priv->ref_count);
+
+ dev_dbg(priv->dev, "ref_count : %d\n", atomic_read(&priv->ref_count));
+
+ return 0;
+}
+
+static int aspeed_peci_release(struct inode *inode, struct file *filp)
+{
+ struct aspeed_peci *priv =
+ container_of(filp->private_data, struct aspeed_peci, miscdev);
+
+ atomic_dec(&priv->ref_count);
+
+ dev_dbg(priv->dev, "ref_count : %d\n", atomic_read(&priv->ref_count));
+
+ return 0;
+}
+
+static irqreturn_t aspeed_peci_irq_handler(int irq, void *arg)
+{
+ struct aspeed_peci *priv = arg;
+ bool valid_irq = true;
+
+ if (regmap_read(priv->regmap, AST_PECI_INT_STS, &priv->sts))
+ return IRQ_NONE;
+
+ switch (priv->sts & PECI_INT_MASK) {
+ case PECI_INT_TIMEOUT:
+ dev_dbg(priv->dev, "PECI_INT_TIMEOUT\n");
+ if (regmap_write(priv->regmap, AST_PECI_INT_STS,
+ PECI_INT_TIMEOUT))
+ return IRQ_NONE;
+ break;
+ case PECI_INT_CONNECT:
+ dev_dbg(priv->dev, "PECI_INT_CONNECT\n");
+ if (regmap_write(priv->regmap, AST_PECI_INT_STS,
+ PECI_INT_CONNECT))
+ return IRQ_NONE;
+ break;
+ case PECI_INT_W_FCS_BAD:
+ dev_dbg(priv->dev, "PECI_INT_W_FCS_BAD\n");
+ if (regmap_write(priv->regmap, AST_PECI_INT_STS,
+ PECI_INT_W_FCS_BAD))
+ return IRQ_NONE;
+ break;
+ case PECI_INT_W_FCS_ABORT:
+ dev_dbg(priv->dev, "PECI_INT_W_FCS_ABORT\n");
+ if (regmap_write(priv->regmap, AST_PECI_INT_STS,
+ PECI_INT_W_FCS_ABORT))
+ return IRQ_NONE;
+ break;
+ case PECI_INT_CMD_DONE:
+ dev_dbg(priv->dev, "PECI_INT_CMD_DONE\n");
+ if (regmap_write(priv->regmap, AST_PECI_INT_STS,
+ PECI_INT_CMD_DONE) ||
+ regmap_write(priv->regmap, AST_PECI_CMD, 0))
+ return IRQ_NONE;
+ break;
+ default:
+ dev_dbg(priv->dev, "Unknown PECI interrupt : 0x%08x\n",
+ priv->sts);
+ if (regmap_write(priv->regmap, AST_PECI_INT_STS, priv->sts))
+ return IRQ_NONE;
+ valid_irq = false;
+ break;
+ }
+
+ if (valid_irq)
+ complete(&priv->xfer_complete);
+
+ return IRQ_HANDLED;
+}
+
+static int aspeed_peci_init_ctrl(struct aspeed_peci *priv)
+{
+ struct clk *clkin;
+ u32 clk_freq, clk_divisor, clk_div_val = 0;
+ u32 msg_timing_nego, addr_timing_nego, rd_sampling_point;
+ int ret;
+
+ clkin = devm_clk_get(priv->dev, NULL);
+ if (IS_ERR(clkin)) {
+ dev_err(priv->dev, "Failed to get clk source.\n");
+ return PTR_ERR(clkin);
+ }
+
+ ret = of_property_read_u32(priv->dev->of_node, "clock-frequency",
+ &clk_freq);
+ if (ret < 0) {
+ dev_err(priv->dev,
+ "Could not read clock-frequency property.\n");
+ return ret;
+ }
+
+ clk_divisor = clk_get_rate(clkin) / clk_freq;
+ devm_clk_put(priv->dev, clkin);
+
+ while ((clk_divisor >> 1) && (clk_div_val < PECI_CLK_DIV_MAX))
+ clk_div_val++;
+
+ ret = of_property_read_u32(priv->dev->of_node, "msg-timing-nego",
+ &msg_timing_nego);
+ if (ret || msg_timing_nego > PECI_MSG_TIMING_NEGO_MAX) {
+ dev_warn(priv->dev,
+ "Invalid msg-timing-nego : %u, Use default : %u\n",
+ msg_timing_nego, PECI_MSG_TIMING_NEGO_DEFAULT);
+ msg_timing_nego = PECI_MSG_TIMING_NEGO_DEFAULT;
+ }
+
+ ret = of_property_read_u32(priv->dev->of_node, "addr-timing-nego",
+ &addr_timing_nego);
+ if (ret || addr_timing_nego > PECI_ADDR_TIMING_NEGO_MAX) {
+ dev_warn(priv->dev,
+ "Invalid addr-timing-nego : %u, Use default : %u\n",
+ addr_timing_nego, PECI_ADDR_TIMING_NEGO_DEFAULT);
+ addr_timing_nego = PECI_ADDR_TIMING_NEGO_DEFAULT;
+ }
+
+ ret = of_property_read_u32(priv->dev->of_node, "rd-sampling-point",
+ &rd_sampling_point);
+ if (ret || rd_sampling_point > PECI_RD_SAMPLING_POINT_MAX) {
+ dev_warn(priv->dev,
+ "Invalid rd-sampling-point : %u. Use default : %u\n",
+ rd_sampling_point,
+ PECI_RD_SAMPLING_POINT_DEFAULT);
+ rd_sampling_point = PECI_RD_SAMPLING_POINT_DEFAULT;
+ }
+
+ ret = of_property_read_u32(priv->dev->of_node, "cmd-timeout-ms",
+ &priv->cmd_timeout_ms);
+ if (ret || priv->cmd_timeout_ms > PECI_CMD_TIMEOUT_MS_MAX ||
+ priv->cmd_timeout_ms == 0) {
+ dev_warn(priv->dev,
+ "Invalid cmd-timeout-ms : %u. Use default : %u\n",
+ priv->cmd_timeout_ms,
+ PECI_CMD_TIMEOUT_MS_DEFAULT);
+ priv->cmd_timeout_ms = PECI_CMD_TIMEOUT_MS_DEFAULT;
+ }
+
+ ret = regmap_write(priv->regmap, AST_PECI_CTRL,
+ PECI_CTRL_CLK_DIV(PECI_CLK_DIV_DEFAULT) |
+ PECI_CTRL_PECI_CLK_EN);
+ if (ret)
+ return ret;
+
+ usleep_range(1000, 5000);
+
+ /*
+ * Timing negotiation period setting.
+ * The unit of the programmed value is 4 times of PECI clock period.
+ */
+ ret = regmap_write(priv->regmap, AST_PECI_TIMING,
+ PECI_TIMING_MESSAGE(msg_timing_nego) |
+ PECI_TIMING_ADDRESS(addr_timing_nego));
+ if (ret)
+ return ret;
+
+ /* Clear interrupts. */
+ ret = regmap_write(priv->regmap, AST_PECI_INT_STS, PECI_INT_MASK);
+ if (ret)
+ return ret;
+
+ /* Enable interrupts. */
+ ret = regmap_write(priv->regmap, AST_PECI_INT_CTRL, PECI_INT_MASK);
+ if (ret)
+ return ret;
+
+ /* Read sampling point and clock speed setting. */
+ ret = regmap_write(priv->regmap, AST_PECI_CTRL,
+ PECI_CTRL_SAMPLING(rd_sampling_point) |
+ PECI_CTRL_CLK_DIV(clk_div_val) |
+ PECI_CTRL_PECI_EN | PECI_CTRL_PECI_CLK_EN);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static const struct regmap_config aspeed_peci_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = AST_PECI_R_DATA7,
+ .fast_io = true,
+};
+
+static const struct file_operations aspeed_peci_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .unlocked_ioctl = peci_ioctl,
+ .open = aspeed_peci_open,
+ .release = aspeed_peci_release,
+};
+
+static int __init aspeed_peci_probe(struct platform_device *pdev)
+{
+ struct aspeed_peci *priv;
+ struct device *dev;
+ struct resource *res;
+ void __iomem *base;
+ int ret = 0;
+
+ dev = &pdev->dev;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, priv);
+ priv->dev = dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ priv->regmap = devm_regmap_init_mmio(dev, base,
+ &aspeed_peci_regmap_config);
+ if (IS_ERR(priv->regmap))
+ return PTR_ERR(priv->regmap);
+
+ priv->irq = platform_get_irq(pdev, 0);
+ if (!priv->irq)
+ return -ENODEV;
+
+ ret = devm_request_irq(dev, priv->irq, aspeed_peci_irq_handler,
+ IRQF_SHARED,
+ SOC_NAME "-" DEVICE_NAME "-irq",
+ priv);
+ if (ret < 0)
+ return ret;
+
+ priv->miscdev.minor = MISC_DYNAMIC_MINOR;
+ priv->miscdev.name = DEVICE_NAME;
+ priv->miscdev.parent = dev;
+ priv->miscdev.fops = &aspeed_peci_fops;
+
+ ret = misc_register(&priv->miscdev);
+ if (ret) {
+ dev_err(dev, "Failed to request interrupt.\n");
+ return ret;
+ }
+
+ mutex_init(&priv->mutex);
+ init_completion(&priv->xfer_complete);
+
+ crc8_populate_msb(aspeed_peci_crc8_table, PECI_CRC8_POLYNOMIAL);
+
+ ret = aspeed_peci_init_ctrl(priv);
+ if (ret < 0)
+ return ret;
+
+ aspeed_peci_priv = priv;
+
+ dev_info(dev, "peci registered, IRQ %d\n", priv->irq);
+
+ return 0;
+}
+
+static int aspeed_peci_remove(struct platform_device *pdev)
+{
+ struct aspeed_peci *priv = dev_get_drvdata(&pdev->dev);
+
+ aspeed_peci_priv = NULL;
+ dev_set_drvdata(&pdev->dev, NULL);
+ misc_deregister(&priv->miscdev);
+
+ return 0;
+}
+
+static const struct of_device_id aspeed_peci_of_table[] = {
+ { .compatible = "aspeed,ast2400-peci", },
+ { .compatible = "aspeed,ast2500-peci", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, aspeed_peci_of_table);
+
+static struct platform_driver aspeed_peci_driver = {
+ .probe = aspeed_peci_probe,
+ .remove = aspeed_peci_remove,
+ .driver = {
+ .name = SOC_NAME "-" DEVICE_NAME,
+ .of_match_table = aspeed_peci_of_table,
+ },
+};
+module_platform_driver(aspeed_peci_driver);
+
+MODULE_AUTHOR("Ryan Chen <ryan_chen at aspeedtech.com>");
+MODULE_AUTHOR("Jae Hyun Yoo <jae.hyun.yoo at linux.intel.com>");
+MODULE_DESCRIPTION("Aspeed PECI driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/misc/peci.h b/include/misc/peci.h
new file mode 100644
index 0000000..66322c6
--- /dev/null
+++ b/include/misc/peci.h
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2017 Intel Corporation
+
+#ifndef __PECI_H
+#define __PECI_H
+
+#include <linux/peci_ioctl.h>
+
+long peci_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
+
+#endif /* __PECI_H */
diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild
index f330ba4..b34960b 100644
--- a/include/uapi/linux/Kbuild
+++ b/include/uapi/linux/Kbuild
@@ -327,6 +327,7 @@ header-y += packet_diag.h
header-y += param.h
header-y += parport.h
header-y += patchkey.h
+header-y += peci_ioctl.h
header-y += pci.h
header-y += pci_regs.h
header-y += perf_event.h
diff --git a/include/uapi/linux/peci_ioctl.h b/include/uapi/linux/peci_ioctl.h
new file mode 100644
index 0000000..8386848
--- /dev/null
+++ b/include/uapi/linux/peci_ioctl.h
@@ -0,0 +1,270 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2017 Intel Corporation
+
+#ifndef __PECI_IOCTL_H
+#define __PECI_IOCTL_H
+
+#include <linux/ioctl.h>
+
+/* Base Address of 48d */
+#define PECI_BASE_ADDR 0x30 /* The PECI client's default address of 0x30 */
+#define PECI_OFFSET_MAX 8 /* Max numver of CPU clients */
+
+/* PCI Access */
+#define MAX_PCI_READ_LEN 24 /* Number of bytes of the PCI Space read */
+
+#define PCI_BUS0_CPU0 0x00
+#define PCI_BUS0_CPU1 0x80
+#define PCI_CPUBUSNO_BUS 0x00
+#define PCI_CPUBUSNO_DEV 0x08
+#define PCI_CPUBUSNO_FUNC 0x02
+#define PCI_CPUBUSNO 0xcc
+#define PCI_CPUBUSNO_1 0xd0
+#define PCI_CPUBUSNO_VALID 0xd4
+
+/* Package Identifier Read Parameter Value */
+#define PKG_ID_CPU_ID 0x0000 /* 0 - CPUID Info */
+#define PKG_ID_PLATFORM_ID 0x0001 /* 1 - Platform ID */
+#define PKG_ID_UNCORE_ID 0x0002 /* 2 - Uncore Device ID */
+#define PKG_ID_MAX_THREAD_ID 0x0003 /* 3 - Max Thread ID */
+#define PKG_ID_MICROCODE_REV 0x0004 /* 4 - CPU Microcode Update Revision */
+#define PKG_ID_MACHINE_CHECK_STATUS 0x0005 /* 5 - Machine Check Status */
+
+/* RdPkgConfig Index */
+#define MBX_INDEX_CPU_ID 0 /* Package Identifier Read */
+#define MBX_INDEX_VR_DEBUG 1 /* VR Debug */
+#define MBX_INDEX_PKG_TEMP_READ 2 /* Package Temperature Read */
+#define MBX_INDEX_ENERGY_COUNTER 3 /* Energy counter */
+#define MBX_INDEX_ENERGY_STATUS 4 /* DDR Energy Status */
+#define MBX_INDEX_WAKE_MODE_BIT 5 /* "Wake on PECI" Mode bit */
+#define MBX_INDEX_EPI 6 /* Efficient Performance Indication */
+#define MBX_INDEX_PKG_RAPL_PERF 8 /* Package RAPL Performance Status Read */
+#define MBX_INDEX_PER_CORE_DTS_TEMP 9 /* Per Core DTS Temperature Read */
+#define MBX_INDEX_DTS_MARGIN 10 /* DTS thermal margin */
+#define MBX_INDEX_SKT_PWR_THRTL_DUR 11 /* Socket Power Throttled Duration */
+#define MBX_INDEX_CFG_TDP_CONTROL 12 /* TDP Config Control */
+#define MBX_INDEX_CFG_TDP_LEVELS 13 /* TDP Config Levels */
+#define MBX_INDEX_DDR_DIMM_TEMP 14 /* DDR DIMM Temperature */
+#define MBX_INDEX_CFG_ICCMAX 15 /* Configurable ICCMAX */
+#define MBX_INDEX_TEMP_TARGET 16 /* Temperature Target Read */
+#define MBX_INDEX_CURR_CFG_LIMIT 17 /* Current Config Limit */
+#define MBX_INDEX_DIMM_TEMP_READ 20 /* Package Thermal Status Read */
+#define MBX_INDEX_DRAM_IMC_TMP_READ 22 /* DRAM IMC Temperature Read */
+#define MBX_INDEX_DDR_CH_THERM_STAT 23 /* DDR Channel Thermal Status */
+#define MBX_INDEX_PKG_POWER_LIMIT1 26 /* Package Power Limit1 */
+#define MBX_INDEX_PKG_POWER_LIMIT2 27 /* Package Power Limit2 */
+#define MBX_INDEX_TDP 28 /* Thermal design power minimum */
+#define MBX_INDEX_TDP_HIGH 29 /* Thermal design power maximum */
+#define MBX_INDEX_TDP_UNITS 30 /* Units for power and energy registers */
+#define MBX_INDEX_RUN_TIME 31 /* Accumulated Run Time */
+#define MBX_INDEX_CONSTRAINED_TIME 32 /* Thermally Constrained Time Read */
+#define MBX_INDEX_TURBO_RATIO 33 /* Turbo Activation Ratio */
+#define MBX_INDEX_DDR_RAPL_PL1 34 /* DDR RAPL PL1 */
+#define MBX_INDEX_DDR_PWR_INFO_HIGH 35 /* DRAM Power Info Read (high) */
+#define MBX_INDEX_DDR_PWR_INFO_LOW 36 /* DRAM Power Info Read (low) */
+#define MBX_INDEX_DDR_RAPL_PL2 37 /* DDR RAPL PL2 */
+#define MBX_INDEX_DDR_RAPL_STATUS 38 /* DDR RAPL Performance Status */
+#define MBX_INDEX_DDR_HOT_ABSOLUTE 43 /* DDR Hottest Dimm Absolute Temperature */
+#define MBX_INDEX_DDR_HOT_RELATIVE 44 /* DDR Hottest Dimm Relative Temperature */
+#define MBX_INDEX_DDR_THROTTLE_TIME 45 /* DDR Throttle Time */
+#define MBX_INDEX_DDR_THERM_STATUS 46 /* DDR Thermal Status */
+#define MBX_INDEX_TIME_AVG_TEMP 47 /* Package time-averaged temperature */
+#define MBX_INDEX_TURBO_RATIO_LIMIT 49 /* Turbo Ratio Limit Read */
+#define MBX_INDEX_HWP_AUTO_OOB 53 /* HWP Autonomous Out-of-band */
+#define MBX_INDEX_DDR_WARM_BUDGET 55 /* DDR Warm Power Budget */
+#define MBX_INDEX_DDR_HOT_BUDGET 56 /* DDR Hot Power Budget */
+#define MBX_INDEX_PKG_PSYS_PWR_LIM3 57 /* Package/Psys Power Limit3 */
+#define MBX_INDEX_PKG_PSYS_PWR_LIM1 58 /* Package/Psys Power Limit1 */
+#define MBX_INDEX_PKG_PSYS_PWR_LIM2 59 /* Package/Psys Power Limit2 */
+#define MBX_INDEX_PKG_PSYS_PWR_LIM4 60 /* Package/Psys Power Limit4 */
+#define MBX_INDEX_PERF_LIMIT_REASON 65 /* Performance Limit Reasons */
+
+/* WrPkgConfig Index */
+#define MBX_INDEX_DIMM_ABIENT 19
+#define MBX_INDEX_DIMM_TEMP 24
+
+/* Device Specific Completion Code (CC) Definition */
+#define DEV_PECI_CC_RETRY_ERR_MASK 0xf0
+#define DEV_PECI_CC_SUCCESS 0x40
+#define DEV_PECI_CC_TIMEOUT 0x80
+#define DEV_PECI_CC_OUT_OF_RESOURCE 0x81
+#define DEV_PECI_CC_INVALID_REQ 0x90
+
+/* Skylake EDS says to retry for 250ms */
+#define DEV_PECI_RETRY_ATTEMPTS 25
+#define DEV_PECI_RETRY_DELAY_MS 10
+#define DEV_PECI_RETRY_BIT 0x01
+
+#define GET_TEMP_WR_LEN 1
+#define GET_TEMP_RD_LEN 2
+#define GET_TEMP_PECI_CMD 0x01
+
+#define GET_DIB_WR_LEN 1
+#define GET_DIB_RD_LEN 8
+#define GET_DIB_PECI_CMD 0xf7
+
+#define RDPKGCFG_WRITE_LEN 5
+#define RDPKGCFG_READ_LEN_BASE 1
+#define RDPKGCFG_PECI_CMD 0xa1
+
+#define WRPKGCFG_WRITE_LEN_BASE 6
+#define WRPKGCFG_READ_LEN 1
+#define WRPKGCFG_PECI_CMD 0xa5
+
+#define RDIAMSR_WRITE_LEN 5
+#define RDIAMSR_READ_LEN 9
+#define RDIAMSR_PECI_CMD 0xb1
+
+#define WRIAMSR_PECI_CMD 0xb5
+
+#define RDPCICFG_WRITE_LEN 6
+#define RDPCICFG_READ_LEN 5
+#define RDPCICFG_PECI_CMD 0x61
+
+#define WRPCICFG_PECI_CMD 0x65
+
+#define RDPCICFGLOCAL_WRITE_LEN 5
+#define RDPCICFGLOCAL_READ_LEN_BASE 1
+#define RDPCICFGLOCAL_PECI_CMD 0xe1
+
+#define WRPCICFGLOCAL_WRITE_LEN_BASE 6
+#define WRPCICFGLOCAL_READ_LEN 1
+#define WRPCICFGLOCAL_PECI_CMD 0xe5
+
+enum PECI_CMD {
+ PECI_CMD_XFER = 0,
+ PECI_CMD_PING,
+ PECI_CMD_GET_DIB,
+ PECI_CMD_GET_TEMP,
+ PECI_CMD_RD_PKG_CFG,
+ PECI_CMD_WR_PKG_CFG,
+ PECI_CMD_RD_IA_MSR,
+ PECI_CMD_WR_IA_MSR,
+ PECI_CMD_RD_PCI_CFG,
+ PECI_CMD_WR_PCI_CFG,
+ PECI_CMD_RD_PCI_CFG_LOCAL,
+ PECI_CMD_WR_PCI_CFG_LOCAL,
+ PECI_CMD_MAX,
+};
+
+#define MAX_BUFFER_SIZE 32
+
+#pragma pack(push, 1)
+struct peci_xfer_msg {
+ unsigned char client_addr;
+ unsigned char tx_len;
+ unsigned char rx_len;
+ unsigned char tx_buf[MAX_BUFFER_SIZE];
+ unsigned char rx_buf[MAX_BUFFER_SIZE];
+};
+#pragma pack(pop)
+
+struct peci_ping_msg {
+ unsigned char target;
+};
+
+struct peci_get_dib_msg {
+ unsigned char target;
+ unsigned int dib;
+};
+
+struct peci_get_temp_msg {
+ unsigned char target;
+ signed short temp_raw;
+};
+
+struct peci_rd_pkg_cfg_msg {
+ unsigned char target;
+ unsigned char index;
+ unsigned short param;
+ unsigned char rx_len;
+ unsigned char pkg_config[4];
+};
+
+struct peci_wr_pkg_cfg_msg {
+ unsigned char target;
+ unsigned char index;
+ unsigned short param;
+ unsigned char tx_len;
+ unsigned int value;
+};
+
+struct peci_rd_ia_msr_msg {
+ unsigned char target;
+ unsigned char thread_id;
+ unsigned short address;
+ unsigned long value;
+};
+
+struct peci_rd_pci_cfg_msg {
+ unsigned char target;
+ unsigned char bus;
+ unsigned char device;
+ unsigned char function;
+ unsigned short reg;
+ unsigned char pci_config[4];
+};
+
+struct peci_rd_pci_cfg_local_msg {
+ unsigned char target;
+ unsigned char bus;
+ unsigned char device;
+ unsigned char function;
+ unsigned short reg;
+ unsigned char rx_len;
+ unsigned char pci_config[4];
+};
+
+struct peci_wr_pci_cfg_local_msg {
+ unsigned char target;
+ unsigned char bus;
+ unsigned char device;
+ unsigned char function;
+ unsigned short reg;
+ unsigned char tx_len;
+ unsigned int value;
+};
+
+#define PECI_IOC_BASE 'P'
+
+#define PECI_IOC_XFER \
+ _IOWR(PECI_IOC_BASE + PECI_CMD_XFER, 0, \
+ struct peci_xfer_msg)
+
+#define PECI_IOC_PING \
+ _IOWR(PECI_IOC_BASE + PECI_CMD_PING, 0, \
+ struct peci_ping_msg)
+
+#define PECI_IOC_GET_DIB \
+ _IOWR(PECI_IOC_BASE + PECI_CMD_GET_DIB, 0, \
+ struct peci_get_dib_msg)
+
+#define PECI_IOC_GET_TEMP \
+ _IOWR(PECI_IOC_BASE + PECI_CMD_GET_TEMP, 0, \
+ struct peci_get_temp_msg)
+
+#define PECI_IOC_RD_PKG_CFG \
+ _IOWR(PECI_IOC_BASE + PECI_CMD_RD_PKG_CFG, 0, \
+ struct peci_rd_pkg_cfg_msg)
+
+#define PECI_IOC_WR_PKG_CFG \
+ _IOWR(PECI_IOC_BASE + PECI_CMD_WR_PKG_CFG, 0, \
+ struct peci_wr_pkg_cfg_msg)
+
+#define PECI_IOC_RD_IA_MSR \
+ _IOWR(PECI_IOC_BASE + PECI_CMD_RD_IA_MSR, 0, \
+ struct peci_rd_ia_msr_msg)
+
+#define PECI_IOC_RD_PCI_CFG \
+ _IOWR(PECI_IOC_BASE + PECI_CMD_RD_PCI_CFG, 0, \
+ struct peci_rd_pci_cfg_msg)
+
+#define PECI_IOC_RD_PCI_CFG_LOCAL \
+ _IOWR(PECI_IOC_BASE + PECI_CMD_RD_PCI_CFG_LOCAL, 0, \
+ struct peci_rd_pci_cfg_local_msg)
+
+#define PECI_IOC_WR_PCI_CFG_LOCAL \
+ _IOWR(PECI_IOC_BASE + PECI_CMD_WR_PCI_CFG_LOCAL, 0, \
+ struct peci_wr_pci_cfg_local_msg)
+
+#endif /* __PECI_IOCTL_H */
--
2.7.4
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