[PATCH v3 06/10] drivers/peci: Add a PECI adapter driver for Aspeed AST24xx/AST25xx
From: Jae Hyun Yoo
Date: Tue Apr 10 2018 - 14:33:27 EST
This commit adds PECI adapter driver implementation for Aspeed
AST24xx/AST25xx.
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@xxxxxxxxxxxxxxx>
Reviewed-by: Haiyue Wang <haiyue.wang@xxxxxxxxxxxxxxx>
Reviewed-by: James Feist <james.feist@xxxxxxxxxxxxxxx>
Reviewed-by: Vernon Mauery <vernon.mauery@xxxxxxxxxxxxxxx>
Cc: Alan Cox <alan@xxxxxxxxxxxxxxx>
Cc: Andrew Jeffery <andrew@xxxxxxxx>
Cc: Andrew Lunn <andrew@xxxxxxx>
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Fengguang Wu <fengguang.wu@xxxxxxxxx>
Cc: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: Jason M Biils <jason.m.bills@xxxxxxxxxxxxxxx>
Cc: Jean Delvare <jdelvare@xxxxxxxx>
Cc: Joel Stanley <joel@xxxxxxxxx>
Cc: Julia Cartwright <juliac@xxxxxxxxxxxx>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx>
Cc: Milton Miller II <miltonm@xxxxxxxxxx>
Cc: Pavel Machek <pavel@xxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Stef van Os <stef.van.os@xxxxxxxxxxxxxxxxxxxxxxxxx>
Cc: Sumeet R Pawnikar <sumeet.r.pawnikar@xxxxxxxxx>
---
drivers/peci/Kconfig | 28 +++
drivers/peci/Makefile | 3 +
drivers/peci/peci-aspeed.c | 504 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 535 insertions(+)
create mode 100644 drivers/peci/peci-aspeed.c
diff --git a/drivers/peci/Kconfig b/drivers/peci/Kconfig
index 1fbc13f9e6c2..0e33420365de 100644
--- a/drivers/peci/Kconfig
+++ b/drivers/peci/Kconfig
@@ -14,4 +14,32 @@ config PECI
processors and chipset components to external monitoring or control
devices.
+ If you want PECI support, you should say Y here and also to the
+ specific driver for your bus adapter(s) below.
+
+if PECI
+
+#
+# PECI hardware bus configuration
+#
+
+menu "PECI Hardware Bus support"
+
+config PECI_ASPEED
+ tristate "Aspeed AST24xx/AST25xx PECI support"
+ select REGMAP_MMIO
+ depends on OF
+ depends on ARCH_ASPEED || COMPILE_TEST
+ help
+ Say Y here if you want support for the Platform Environment Control
+ Interface (PECI) bus adapter driver on the Aspeed AST24XX and AST25XX
+ SoCs.
+
+ This support is also available as a module. If so, the module
+ will be called peci-aspeed.
+
+endmenu
+
+endif # PECI
+
endmenu
diff --git a/drivers/peci/Makefile b/drivers/peci/Makefile
index 9e8615e0d3ff..886285e69765 100644
--- a/drivers/peci/Makefile
+++ b/drivers/peci/Makefile
@@ -4,3 +4,6 @@
# Core functionality
obj-$(CONFIG_PECI) += peci-core.o
+
+# Hardware specific bus drivers
+obj-$(CONFIG_PECI_ASPEED) += peci-aspeed.o
diff --git a/drivers/peci/peci-aspeed.c b/drivers/peci/peci-aspeed.c
new file mode 100644
index 000000000000..be2a1f327eb1
--- /dev/null
+++ b/drivers/peci/peci-aspeed.c
@@ -0,0 +1,504 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2012-2017 ASPEED Technology Inc.
+// Copyright (c) 2018 Intel Corporation
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/peci.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#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 peci_adapter adaper;
+ struct device *dev;
+ struct regmap *regmap;
+ int irq;
+ struct completion xfer_complete;
+ u32 status;
+ u32 cmd_timeout_ms;
+};
+
+#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_MS 50
+#define PECI_IDLE_CHECK_INTERVAL_MS 10
+
+#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
+
+static int aspeed_peci_xfer_native(struct aspeed_peci *priv,
+ struct peci_xfer_msg *msg)
+{
+ long err, timeout = msecs_to_jiffies(priv->cmd_timeout_ms);
+ u32 peci_head, peci_state, rx_data, cmd_sts;
+ ktime_t start, end;
+ s64 elapsed_ms;
+ int i, rc = 0;
+ uint reg;
+
+ start = ktime_get();
+
+ /* 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))) {
+ end = ktime_get();
+ elapsed_ms = ktime_to_ms(ktime_sub(end, start));
+ if (elapsed_ms >= PECI_IDLE_CHECK_TIMEOUT_MS) {
+ dev_dbg(priv->dev, "Timeout waiting for idle state!\n");
+ return -ETIMEDOUT;
+ }
+
+ usleep_range(PECI_IDLE_CHECK_INTERVAL_MS * 1000,
+ (PECI_IDLE_CHECK_INTERVAL_MS * 1000) + 1000);
+ };
+
+ reinit_completion(&priv->xfer_complete);
+
+ peci_head = PECI_TAGET_ADDR(msg->addr) |
+ PECI_WRITE_LEN(msg->tx_len) |
+ PECI_READ_LEN(msg->rx_len);
+
+ rc = regmap_write(priv->regmap, AST_PECI_CMD_CTRL, peci_head);
+ if (rc)
+ return rc;
+
+ for (i = 0; i < msg->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,
+ (msg->tx_buf[i + 3] << 24) |
+ (msg->tx_buf[i + 2] << 16) |
+ (msg->tx_buf[i + 1] << 8) |
+ msg->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,
+ msg->tx_buf, msg->tx_len, true);
+#endif
+
+ rc = regmap_write(priv->regmap, AST_PECI_CMD, PECI_CMD_FIRE);
+ if (rc)
+ return rc;
+
+ err = wait_for_completion_interruptible_timeout(&priv->xfer_complete,
+ timeout);
+
+ dev_dbg(priv->dev, "INT_STS : 0x%08x\n", priv->status);
+ 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");
+
+ rc = regmap_write(priv->regmap, AST_PECI_CMD, 0);
+ if (rc)
+ return rc;
+
+ if (err <= 0 || !(priv->status & PECI_INT_CMD_DONE)) {
+ if (err < 0) { /* -ERESTARTSYS */
+ return (int)err;
+ } else if (err == 0) {
+ dev_dbg(priv->dev, "Timeout waiting for a response!\n");
+ return -ETIMEDOUT;
+ }
+
+ dev_dbg(priv->dev, "No valid response!\n");
+ return -EIO;
+ }
+
+ for (i = 0; i < msg->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;
+ }
+
+ msg->rx_buf[i] = (u8)(rx_data >> (byte_offset << 3));
+ }
+
+#if DUMP_DEBUG
+ print_hex_dump(KERN_DEBUG, "RX : ", DUMP_PREFIX_NONE, 16, 1,
+ msg->rx_buf, msg->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 irqreturn_t aspeed_peci_irq_handler(int irq, void *arg)
+{
+ struct aspeed_peci *priv = arg;
+ u32 status_ack = 0;
+
+ if (regmap_read(priv->regmap, AST_PECI_INT_STS, &priv->status))
+ return IRQ_NONE;
+
+ /* Be noted that multiple interrupt bits can be set at the same time */
+ if (priv->status & PECI_INT_TIMEOUT) {
+ dev_dbg(priv->dev, "PECI_INT_TIMEOUT\n");
+ status_ack |= PECI_INT_TIMEOUT;
+ }
+
+ if (priv->status & PECI_INT_CONNECT) {
+ dev_dbg(priv->dev, "PECI_INT_CONNECT\n");
+ status_ack |= PECI_INT_CONNECT;
+ }
+
+ if (priv->status & PECI_INT_W_FCS_BAD) {
+ dev_dbg(priv->dev, "PECI_INT_W_FCS_BAD\n");
+ status_ack |= PECI_INT_W_FCS_BAD;
+ }
+
+ if (priv->status & PECI_INT_W_FCS_ABORT) {
+ dev_dbg(priv->dev, "PECI_INT_W_FCS_ABORT\n");
+ status_ack |= PECI_INT_W_FCS_ABORT;
+ }
+
+ /**
+ * All commands should be ended up with a PECI_INT_CMD_DONE bit set
+ * even in an error case.
+ */
+ if (priv->status & PECI_INT_CMD_DONE) {
+ dev_dbg(priv->dev, "PECI_INT_CMD_DONE\n");
+ status_ack |= PECI_INT_CMD_DONE;
+ complete(&priv->xfer_complete);
+ }
+
+ if (regmap_write(priv->regmap, AST_PECI_INT_STS, status_ack))
+ return IRQ_NONE;
+
+ return IRQ_HANDLED;
+}
+
+static int aspeed_peci_init_ctrl(struct aspeed_peci *priv)
+{
+ u32 msg_timing_nego, addr_timing_nego, rd_sampling_point;
+ u32 clk_freq, clk_divisor, clk_div_val = 0;
+ struct clk *clkin;
+ 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,
+ .val_format_endian = REGMAP_ENDIAN_LITTLE,
+ .fast_io = true,
+};
+
+static int aspeed_peci_xfer(struct peci_adapter *adaper,
+ struct peci_xfer_msg *msg)
+{
+ struct aspeed_peci *priv = peci_get_adapdata(adaper);
+
+ return aspeed_peci_xfer_native(priv, msg);
+}
+
+static int aspeed_peci_probe(struct platform_device *pdev)
+{
+ struct aspeed_peci *priv;
+ struct resource *res;
+ void __iomem *base;
+ int ret = 0;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ dev_set_drvdata(&pdev->dev, priv);
+ priv->dev = &pdev->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(&pdev->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(&pdev->dev, priv->irq, aspeed_peci_irq_handler,
+ IRQF_SHARED,
+ "peci-aspeed-irq",
+ priv);
+ if (ret < 0)
+ return ret;
+
+ init_completion(&priv->xfer_complete);
+
+ priv->adaper.dev.parent = priv->dev;
+ priv->adaper.dev.of_node = of_node_get(dev_of_node(priv->dev));
+ strlcpy(priv->adaper.name, pdev->name, sizeof(priv->adaper.name));
+ priv->adaper.xfer = aspeed_peci_xfer;
+ peci_set_adapdata(&priv->adaper, priv);
+
+ ret = aspeed_peci_init_ctrl(priv);
+ if (ret < 0)
+ return ret;
+
+ ret = peci_add_adapter(&priv->adaper);
+ if (ret < 0)
+ return ret;
+
+ dev_info(&pdev->dev, "peci bus %d registered, irq %d\n",
+ priv->adaper.nr, priv->irq);
+
+ return 0;
+}
+
+static int aspeed_peci_remove(struct platform_device *pdev)
+{
+ struct aspeed_peci *priv = dev_get_drvdata(&pdev->dev);
+
+ peci_del_adapter(&priv->adaper);
+ of_node_put(priv->adaper.dev.of_node);
+
+ 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 = "peci-aspeed",
+ .of_match_table = of_match_ptr(aspeed_peci_of_table),
+ },
+};
+module_platform_driver(aspeed_peci_driver);
+
+MODULE_AUTHOR("Ryan Chen <ryan_chen@xxxxxxxxxxxxxx>");
+MODULE_AUTHOR("Jae Hyun Yoo <jae.hyun.yoo@xxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Aspeed PECI driver");
+MODULE_LICENSE("GPL v2");
--
2.16.2