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-rw-r--r--drivers/peci/controller/Kconfig34
-rw-r--r--drivers/peci/controller/Makefile4
-rw-r--r--drivers/peci/controller/peci-aspeed.c599
-rw-r--r--drivers/peci/controller/peci-npcm.c298
4 files changed, 935 insertions, 0 deletions
diff --git a/drivers/peci/controller/Kconfig b/drivers/peci/controller/Kconfig
new file mode 100644
index 0000000000..4f9c245ad0
--- /dev/null
+++ b/drivers/peci/controller/Kconfig
@@ -0,0 +1,34 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config PECI_ASPEED
+ tristate "ASPEED PECI support"
+ depends on ARCH_ASPEED || COMPILE_TEST
+ depends on OF
+ depends on HAS_IOMEM
+ depends on COMMON_CLK
+ help
+ This option enables PECI controller driver for ASPEED AST2400,
+ AST2500 and AST2600 SoCs. It allows BMC to discover devices
+ connected to it, and communicate with them using PECI protocol.
+
+ Say Y here if your system runs on ASPEED SoC and you are using it
+ as BMC for Intel platform.
+
+ This driver can also be built as a module. If so, the module will
+ be called peci-aspeed.
+
+config PECI_NPCM
+ tristate "Nuvoton NPCM PECI support"
+ depends on ARCH_NPCM || COMPILE_TEST
+ depends on OF
+ select REGMAP_MMIO
+ help
+ This option enables PECI controller driver for Nuvoton NPCM7XX
+ and NPCM8XX SoCs. It allows BMC to discover devices connected
+ to it and communicate with them using PECI protocol.
+
+ Say Y here if you want support for the Platform Environment Control
+ Interface (PECI) bus adapter driver on the Nuvoton NPCM SoCs.
+
+ This support is also available as a module. If so, the module
+ will be called peci-npcm.
diff --git a/drivers/peci/controller/Makefile b/drivers/peci/controller/Makefile
new file mode 100644
index 0000000000..e247449bb4
--- /dev/null
+++ b/drivers/peci/controller/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+obj-$(CONFIG_PECI_ASPEED) += peci-aspeed.o
+obj-$(CONFIG_PECI_NPCM) += peci-npcm.o
diff --git a/drivers/peci/controller/peci-aspeed.c b/drivers/peci/controller/peci-aspeed.c
new file mode 100644
index 0000000000..7fdc25afcf
--- /dev/null
+++ b/drivers/peci/controller/peci-aspeed.c
@@ -0,0 +1,599 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright (c) 2012-2017 ASPEED Technology Inc.
+// Copyright (c) 2018-2021 Intel Corporation
+
+#include <asm/unaligned.h>
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/jiffies.h>
+#include <linux/math.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/peci.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+/* ASPEED PECI Registers */
+/* Control Register */
+#define ASPEED_PECI_CTRL 0x00
+#define ASPEED_PECI_CTRL_SAMPLING_MASK GENMASK(19, 16)
+#define ASPEED_PECI_CTRL_RD_MODE_MASK GENMASK(13, 12)
+#define ASPEED_PECI_CTRL_RD_MODE_DBG BIT(13)
+#define ASPEED_PECI_CTRL_RD_MODE_COUNT BIT(12)
+#define ASPEED_PECI_CTRL_CLK_SRC_HCLK BIT(11)
+#define ASPEED_PECI_CTRL_CLK_DIV_MASK GENMASK(10, 8)
+#define ASPEED_PECI_CTRL_INVERT_OUT BIT(7)
+#define ASPEED_PECI_CTRL_INVERT_IN BIT(6)
+#define ASPEED_PECI_CTRL_BUS_CONTENTION_EN BIT(5)
+#define ASPEED_PECI_CTRL_PECI_EN BIT(4)
+#define ASPEED_PECI_CTRL_PECI_CLK_EN BIT(0)
+
+/* Timing Negotiation Register */
+#define ASPEED_PECI_TIMING_NEGOTIATION 0x04
+#define ASPEED_PECI_T_NEGO_MSG_MASK GENMASK(15, 8)
+#define ASPEED_PECI_T_NEGO_ADDR_MASK GENMASK(7, 0)
+
+/* Command Register */
+#define ASPEED_PECI_CMD 0x08
+#define ASPEED_PECI_CMD_PIN_MONITORING BIT(31)
+#define ASPEED_PECI_CMD_STS_MASK GENMASK(27, 24)
+#define ASPEED_PECI_CMD_STS_ADDR_T_NEGO 0x3
+#define ASPEED_PECI_CMD_IDLE_MASK \
+ (ASPEED_PECI_CMD_STS_MASK | ASPEED_PECI_CMD_PIN_MONITORING)
+#define ASPEED_PECI_CMD_FIRE BIT(0)
+
+/* Read/Write Length Register */
+#define ASPEED_PECI_RW_LENGTH 0x0c
+#define ASPEED_PECI_AW_FCS_EN BIT(31)
+#define ASPEED_PECI_RD_LEN_MASK GENMASK(23, 16)
+#define ASPEED_PECI_WR_LEN_MASK GENMASK(15, 8)
+#define ASPEED_PECI_TARGET_ADDR_MASK GENMASK(7, 0)
+
+/* Expected FCS Data Register */
+#define ASPEED_PECI_EXPECTED_FCS 0x10
+#define ASPEED_PECI_EXPECTED_RD_FCS_MASK GENMASK(23, 16)
+#define ASPEED_PECI_EXPECTED_AW_FCS_AUTO_MASK GENMASK(15, 8)
+#define ASPEED_PECI_EXPECTED_WR_FCS_MASK GENMASK(7, 0)
+
+/* Captured FCS Data Register */
+#define ASPEED_PECI_CAPTURED_FCS 0x14
+#define ASPEED_PECI_CAPTURED_RD_FCS_MASK GENMASK(23, 16)
+#define ASPEED_PECI_CAPTURED_WR_FCS_MASK GENMASK(7, 0)
+
+/* Interrupt Register */
+#define ASPEED_PECI_INT_CTRL 0x18
+#define ASPEED_PECI_TIMING_NEGO_SEL_MASK GENMASK(31, 30)
+#define ASPEED_PECI_1ST_BIT_OF_ADDR_NEGO 0
+#define ASPEED_PECI_2ND_BIT_OF_ADDR_NEGO 1
+#define ASPEED_PECI_MESSAGE_NEGO 2
+#define ASPEED_PECI_INT_MASK GENMASK(4, 0)
+#define ASPEED_PECI_INT_BUS_TIMEOUT BIT(4)
+#define ASPEED_PECI_INT_BUS_CONTENTION BIT(3)
+#define ASPEED_PECI_INT_WR_FCS_BAD BIT(2)
+#define ASPEED_PECI_INT_WR_FCS_ABORT BIT(1)
+#define ASPEED_PECI_INT_CMD_DONE BIT(0)
+
+/* Interrupt Status Register */
+#define ASPEED_PECI_INT_STS 0x1c
+#define ASPEED_PECI_INT_TIMING_RESULT_MASK GENMASK(29, 16)
+ /* bits[4..0]: Same bit fields in the 'Interrupt Register' */
+
+/* Rx/Tx Data Buffer Registers */
+#define ASPEED_PECI_WR_DATA0 0x20
+#define ASPEED_PECI_WR_DATA1 0x24
+#define ASPEED_PECI_WR_DATA2 0x28
+#define ASPEED_PECI_WR_DATA3 0x2c
+#define ASPEED_PECI_RD_DATA0 0x30
+#define ASPEED_PECI_RD_DATA1 0x34
+#define ASPEED_PECI_RD_DATA2 0x38
+#define ASPEED_PECI_RD_DATA3 0x3c
+#define ASPEED_PECI_WR_DATA4 0x40
+#define ASPEED_PECI_WR_DATA5 0x44
+#define ASPEED_PECI_WR_DATA6 0x48
+#define ASPEED_PECI_WR_DATA7 0x4c
+#define ASPEED_PECI_RD_DATA4 0x50
+#define ASPEED_PECI_RD_DATA5 0x54
+#define ASPEED_PECI_RD_DATA6 0x58
+#define ASPEED_PECI_RD_DATA7 0x5c
+#define ASPEED_PECI_DATA_BUF_SIZE_MAX 32
+
+/* Timing Negotiation */
+#define ASPEED_PECI_CLK_FREQUENCY_MIN 2000
+#define ASPEED_PECI_CLK_FREQUENCY_DEFAULT 1000000
+#define ASPEED_PECI_CLK_FREQUENCY_MAX 2000000
+#define ASPEED_PECI_RD_SAMPLING_POINT_DEFAULT 8
+/* Timeout */
+#define ASPEED_PECI_IDLE_CHECK_TIMEOUT_US (50 * USEC_PER_MSEC)
+#define ASPEED_PECI_IDLE_CHECK_INTERVAL_US (10 * USEC_PER_MSEC)
+#define ASPEED_PECI_CMD_TIMEOUT_MS_DEFAULT 1000
+#define ASPEED_PECI_CMD_TIMEOUT_MS_MAX 1000
+
+#define ASPEED_PECI_CLK_DIV1(msg_timing) (4 * (msg_timing) + 1)
+#define ASPEED_PECI_CLK_DIV2(clk_div_exp) BIT(clk_div_exp)
+#define ASPEED_PECI_CLK_DIV(msg_timing, clk_div_exp) \
+ (4 * ASPEED_PECI_CLK_DIV1(msg_timing) * ASPEED_PECI_CLK_DIV2(clk_div_exp))
+
+struct aspeed_peci {
+ struct peci_controller *controller;
+ struct device *dev;
+ void __iomem *base;
+ struct reset_control *rst;
+ int irq;
+ spinlock_t lock; /* to sync completion status handling */
+ struct completion xfer_complete;
+ struct clk *clk;
+ u32 clk_frequency;
+ u32 status;
+ u32 cmd_timeout_ms;
+};
+
+struct clk_aspeed_peci {
+ struct clk_hw hw;
+ struct aspeed_peci *aspeed_peci;
+};
+
+static void aspeed_peci_controller_enable(struct aspeed_peci *priv)
+{
+ u32 val = readl(priv->base + ASPEED_PECI_CTRL);
+
+ val |= ASPEED_PECI_CTRL_PECI_CLK_EN;
+ val |= ASPEED_PECI_CTRL_PECI_EN;
+
+ writel(val, priv->base + ASPEED_PECI_CTRL);
+}
+
+static void aspeed_peci_init_regs(struct aspeed_peci *priv)
+{
+ u32 val;
+
+ /* Clear interrupts */
+ writel(ASPEED_PECI_INT_MASK, priv->base + ASPEED_PECI_INT_STS);
+
+ /* Set timing negotiation mode and enable interrupts */
+ val = FIELD_PREP(ASPEED_PECI_TIMING_NEGO_SEL_MASK, ASPEED_PECI_1ST_BIT_OF_ADDR_NEGO);
+ val |= ASPEED_PECI_INT_MASK;
+ writel(val, priv->base + ASPEED_PECI_INT_CTRL);
+
+ val = FIELD_PREP(ASPEED_PECI_CTRL_SAMPLING_MASK, ASPEED_PECI_RD_SAMPLING_POINT_DEFAULT);
+ writel(val, priv->base + ASPEED_PECI_CTRL);
+}
+
+static int aspeed_peci_check_idle(struct aspeed_peci *priv)
+{
+ u32 cmd_sts = readl(priv->base + ASPEED_PECI_CMD);
+ int ret;
+
+ /*
+ * Under normal circumstances, we expect to be idle here.
+ * In case there were any errors/timeouts that led to the situation
+ * where the hardware is not in idle state - we need to reset and
+ * reinitialize it to avoid potential controller hang.
+ */
+ if (FIELD_GET(ASPEED_PECI_CMD_STS_MASK, cmd_sts)) {
+ ret = reset_control_assert(priv->rst);
+ if (ret) {
+ dev_err(priv->dev, "cannot assert reset control\n");
+ return ret;
+ }
+
+ ret = reset_control_deassert(priv->rst);
+ if (ret) {
+ dev_err(priv->dev, "cannot deassert reset control\n");
+ return ret;
+ }
+
+ aspeed_peci_init_regs(priv);
+
+ ret = clk_set_rate(priv->clk, priv->clk_frequency);
+ if (ret < 0) {
+ dev_err(priv->dev, "cannot set clock frequency\n");
+ return ret;
+ }
+
+ aspeed_peci_controller_enable(priv);
+ }
+
+ return readl_poll_timeout(priv->base + ASPEED_PECI_CMD,
+ cmd_sts,
+ !(cmd_sts & ASPEED_PECI_CMD_IDLE_MASK),
+ ASPEED_PECI_IDLE_CHECK_INTERVAL_US,
+ ASPEED_PECI_IDLE_CHECK_TIMEOUT_US);
+}
+
+static int aspeed_peci_xfer(struct peci_controller *controller,
+ u8 addr, struct peci_request *req)
+{
+ struct aspeed_peci *priv = dev_get_drvdata(controller->dev.parent);
+ unsigned long timeout = msecs_to_jiffies(priv->cmd_timeout_ms);
+ u32 peci_head;
+ int ret, i;
+
+ if (req->tx.len > ASPEED_PECI_DATA_BUF_SIZE_MAX ||
+ req->rx.len > ASPEED_PECI_DATA_BUF_SIZE_MAX)
+ return -EINVAL;
+
+ /* Check command sts and bus idle state */
+ ret = aspeed_peci_check_idle(priv);
+ if (ret)
+ return ret; /* -ETIMEDOUT */
+
+ spin_lock_irq(&priv->lock);
+ reinit_completion(&priv->xfer_complete);
+
+ peci_head = FIELD_PREP(ASPEED_PECI_TARGET_ADDR_MASK, addr) |
+ FIELD_PREP(ASPEED_PECI_WR_LEN_MASK, req->tx.len) |
+ FIELD_PREP(ASPEED_PECI_RD_LEN_MASK, req->rx.len);
+
+ writel(peci_head, priv->base + ASPEED_PECI_RW_LENGTH);
+
+ for (i = 0; i < req->tx.len; i += 4) {
+ u32 reg = (i < 16 ? ASPEED_PECI_WR_DATA0 : ASPEED_PECI_WR_DATA4) + i % 16;
+
+ writel(get_unaligned_le32(&req->tx.buf[i]), priv->base + reg);
+ }
+
+#if IS_ENABLED(CONFIG_DYNAMIC_DEBUG)
+ dev_dbg(priv->dev, "HEAD : %#08x\n", peci_head);
+ print_hex_dump_bytes("TX : ", DUMP_PREFIX_NONE, req->tx.buf, req->tx.len);
+#endif
+
+ priv->status = 0;
+ writel(ASPEED_PECI_CMD_FIRE, priv->base + ASPEED_PECI_CMD);
+ spin_unlock_irq(&priv->lock);
+
+ ret = wait_for_completion_interruptible_timeout(&priv->xfer_complete, timeout);
+ if (ret < 0)
+ return ret;
+
+ if (ret == 0) {
+ dev_dbg(priv->dev, "timeout waiting for a response\n");
+ return -ETIMEDOUT;
+ }
+
+ spin_lock_irq(&priv->lock);
+
+ if (priv->status != ASPEED_PECI_INT_CMD_DONE) {
+ spin_unlock_irq(&priv->lock);
+ dev_dbg(priv->dev, "no valid response, status: %#02x\n", priv->status);
+ return -EIO;
+ }
+
+ spin_unlock_irq(&priv->lock);
+
+ /*
+ * We need to use dword reads for register access, make sure that the
+ * buffer size is multiple of 4-bytes.
+ */
+ BUILD_BUG_ON(PECI_REQUEST_MAX_BUF_SIZE % 4);
+
+ for (i = 0; i < req->rx.len; i += 4) {
+ u32 reg = (i < 16 ? ASPEED_PECI_RD_DATA0 : ASPEED_PECI_RD_DATA4) + i % 16;
+ u32 rx_data = readl(priv->base + reg);
+
+ put_unaligned_le32(rx_data, &req->rx.buf[i]);
+ }
+
+#if IS_ENABLED(CONFIG_DYNAMIC_DEBUG)
+ print_hex_dump_bytes("RX : ", DUMP_PREFIX_NONE, req->rx.buf, req->rx.len);
+#endif
+ return 0;
+}
+
+static irqreturn_t aspeed_peci_irq_handler(int irq, void *arg)
+{
+ struct aspeed_peci *priv = arg;
+ u32 status;
+
+ spin_lock(&priv->lock);
+ status = readl(priv->base + ASPEED_PECI_INT_STS);
+ writel(status, priv->base + ASPEED_PECI_INT_STS);
+ priv->status |= (status & ASPEED_PECI_INT_MASK);
+
+ /*
+ * All commands should be ended up with a ASPEED_PECI_INT_CMD_DONE bit
+ * set even in an error case.
+ */
+ if (status & ASPEED_PECI_INT_CMD_DONE)
+ complete(&priv->xfer_complete);
+
+ writel(0, priv->base + ASPEED_PECI_CMD);
+
+ spin_unlock(&priv->lock);
+
+ return IRQ_HANDLED;
+}
+
+static void clk_aspeed_peci_find_div_values(unsigned long rate, int *msg_timing, int *clk_div_exp)
+{
+ unsigned long best_diff = ~0ul, diff;
+ int msg_timing_temp, clk_div_exp_temp, i, j;
+
+ for (i = 1; i <= 255; i++)
+ for (j = 0; j < 8; j++) {
+ diff = abs(rate - ASPEED_PECI_CLK_DIV1(i) * ASPEED_PECI_CLK_DIV2(j));
+ if (diff < best_diff) {
+ msg_timing_temp = i;
+ clk_div_exp_temp = j;
+ best_diff = diff;
+ }
+ }
+
+ *msg_timing = msg_timing_temp;
+ *clk_div_exp = clk_div_exp_temp;
+}
+
+static int clk_aspeed_peci_get_div(unsigned long rate, const unsigned long *prate)
+{
+ unsigned long this_rate = *prate / (4 * rate);
+ int msg_timing, clk_div_exp;
+
+ clk_aspeed_peci_find_div_values(this_rate, &msg_timing, &clk_div_exp);
+
+ return ASPEED_PECI_CLK_DIV(msg_timing, clk_div_exp);
+}
+
+static int clk_aspeed_peci_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long prate)
+{
+ struct clk_aspeed_peci *peci_clk = container_of(hw, struct clk_aspeed_peci, hw);
+ struct aspeed_peci *aspeed_peci = peci_clk->aspeed_peci;
+ unsigned long this_rate = prate / (4 * rate);
+ int clk_div_exp, msg_timing;
+ u32 val;
+
+ clk_aspeed_peci_find_div_values(this_rate, &msg_timing, &clk_div_exp);
+
+ val = readl(aspeed_peci->base + ASPEED_PECI_CTRL);
+ val |= FIELD_PREP(ASPEED_PECI_CTRL_CLK_DIV_MASK, clk_div_exp);
+ writel(val, aspeed_peci->base + ASPEED_PECI_CTRL);
+
+ val = FIELD_PREP(ASPEED_PECI_T_NEGO_MSG_MASK, msg_timing);
+ val |= FIELD_PREP(ASPEED_PECI_T_NEGO_ADDR_MASK, msg_timing);
+ writel(val, aspeed_peci->base + ASPEED_PECI_TIMING_NEGOTIATION);
+
+ return 0;
+}
+
+static long clk_aspeed_peci_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ int div = clk_aspeed_peci_get_div(rate, prate);
+
+ return DIV_ROUND_UP_ULL(*prate, div);
+}
+
+static unsigned long clk_aspeed_peci_recalc_rate(struct clk_hw *hw, unsigned long prate)
+{
+ struct clk_aspeed_peci *peci_clk = container_of(hw, struct clk_aspeed_peci, hw);
+ struct aspeed_peci *aspeed_peci = peci_clk->aspeed_peci;
+ int div, msg_timing, addr_timing, clk_div_exp;
+ u32 reg;
+
+ reg = readl(aspeed_peci->base + ASPEED_PECI_TIMING_NEGOTIATION);
+ msg_timing = FIELD_GET(ASPEED_PECI_T_NEGO_MSG_MASK, reg);
+ addr_timing = FIELD_GET(ASPEED_PECI_T_NEGO_ADDR_MASK, reg);
+
+ if (msg_timing != addr_timing)
+ return 0;
+
+ reg = readl(aspeed_peci->base + ASPEED_PECI_CTRL);
+ clk_div_exp = FIELD_GET(ASPEED_PECI_CTRL_CLK_DIV_MASK, reg);
+
+ div = ASPEED_PECI_CLK_DIV(msg_timing, clk_div_exp);
+
+ return DIV_ROUND_UP_ULL(prate, div);
+}
+
+static const struct clk_ops clk_aspeed_peci_ops = {
+ .set_rate = clk_aspeed_peci_set_rate,
+ .round_rate = clk_aspeed_peci_round_rate,
+ .recalc_rate = clk_aspeed_peci_recalc_rate,
+};
+
+/*
+ * PECI HW contains a clock divider which is a combination of:
+ * div0: 4 (fixed divider)
+ * div1: x + 1
+ * div2: 1 << y
+ * In other words, out_clk = in_clk / (div0 * div1 * div2)
+ * The resulting frequency is used by PECI Controller to drive the PECI bus to
+ * negotiate optimal transfer rate.
+ */
+static struct clk *devm_aspeed_peci_register_clk_div(struct device *dev, struct clk *parent,
+ struct aspeed_peci *priv)
+{
+ struct clk_aspeed_peci *peci_clk;
+ struct clk_init_data init;
+ const char *parent_name;
+ char name[32];
+ int ret;
+
+ snprintf(name, sizeof(name), "%s_div", dev_name(dev));
+
+ parent_name = __clk_get_name(parent);
+
+ init.ops = &clk_aspeed_peci_ops;
+ init.name = name;
+ init.parent_names = (const char* []) { parent_name };
+ init.num_parents = 1;
+ init.flags = 0;
+
+ peci_clk = devm_kzalloc(dev, sizeof(struct clk_aspeed_peci), GFP_KERNEL);
+ if (!peci_clk)
+ return ERR_PTR(-ENOMEM);
+
+ peci_clk->hw.init = &init;
+ peci_clk->aspeed_peci = priv;
+
+ ret = devm_clk_hw_register(dev, &peci_clk->hw);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return peci_clk->hw.clk;
+}
+
+static void aspeed_peci_property_sanitize(struct device *dev, const char *propname,
+ u32 min, u32 max, u32 default_val, u32 *propval)
+{
+ u32 val;
+ int ret;
+
+ ret = device_property_read_u32(dev, propname, &val);
+ if (ret) {
+ val = default_val;
+ } else if (val > max || val < min) {
+ dev_warn(dev, "invalid %s: %u, falling back to: %u\n",
+ propname, val, default_val);
+
+ val = default_val;
+ }
+
+ *propval = val;
+}
+
+static void aspeed_peci_property_setup(struct aspeed_peci *priv)
+{
+ aspeed_peci_property_sanitize(priv->dev, "clock-frequency",
+ ASPEED_PECI_CLK_FREQUENCY_MIN, ASPEED_PECI_CLK_FREQUENCY_MAX,
+ ASPEED_PECI_CLK_FREQUENCY_DEFAULT, &priv->clk_frequency);
+ aspeed_peci_property_sanitize(priv->dev, "cmd-timeout-ms",
+ 1, ASPEED_PECI_CMD_TIMEOUT_MS_MAX,
+ ASPEED_PECI_CMD_TIMEOUT_MS_DEFAULT, &priv->cmd_timeout_ms);
+}
+
+static const struct peci_controller_ops aspeed_ops = {
+ .xfer = aspeed_peci_xfer,
+};
+
+static void aspeed_peci_reset_control_release(void *data)
+{
+ reset_control_assert(data);
+}
+
+static int devm_aspeed_peci_reset_control_deassert(struct device *dev, struct reset_control *rst)
+{
+ int ret;
+
+ ret = reset_control_deassert(rst);
+ if (ret)
+ return ret;
+
+ return devm_add_action_or_reset(dev, aspeed_peci_reset_control_release, rst);
+}
+
+static void aspeed_peci_clk_release(void *data)
+{
+ clk_disable_unprepare(data);
+}
+
+static int devm_aspeed_peci_clk_enable(struct device *dev, struct clk *clk)
+{
+ int ret;
+
+ ret = clk_prepare_enable(clk);
+ if (ret)
+ return ret;
+
+ return devm_add_action_or_reset(dev, aspeed_peci_clk_release, clk);
+}
+
+static int aspeed_peci_probe(struct platform_device *pdev)
+{
+ struct peci_controller *controller;
+ struct aspeed_peci *priv;
+ struct clk *ref_clk;
+ int ret;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->dev = &pdev->dev;
+ dev_set_drvdata(priv->dev, priv);
+
+ priv->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(priv->base))
+ return PTR_ERR(priv->base);
+
+ priv->irq = platform_get_irq(pdev, 0);
+ if (priv->irq < 0)
+ return priv->irq;
+
+ ret = devm_request_irq(&pdev->dev, priv->irq, aspeed_peci_irq_handler,
+ 0, "peci-aspeed", priv);
+ if (ret)
+ return ret;
+
+ init_completion(&priv->xfer_complete);
+ spin_lock_init(&priv->lock);
+
+ priv->rst = devm_reset_control_get(&pdev->dev, NULL);
+ if (IS_ERR(priv->rst))
+ return dev_err_probe(priv->dev, PTR_ERR(priv->rst),
+ "failed to get reset control\n");
+
+ ret = devm_aspeed_peci_reset_control_deassert(priv->dev, priv->rst);
+ if (ret)
+ return dev_err_probe(priv->dev, ret, "cannot deassert reset control\n");
+
+ aspeed_peci_property_setup(priv);
+
+ aspeed_peci_init_regs(priv);
+
+ ref_clk = devm_clk_get(priv->dev, NULL);
+ if (IS_ERR(ref_clk))
+ return dev_err_probe(priv->dev, PTR_ERR(ref_clk), "failed to get ref clock\n");
+
+ priv->clk = devm_aspeed_peci_register_clk_div(priv->dev, ref_clk, priv);
+ if (IS_ERR(priv->clk))
+ return dev_err_probe(priv->dev, PTR_ERR(priv->clk), "cannot register clock\n");
+
+ ret = clk_set_rate(priv->clk, priv->clk_frequency);
+ if (ret < 0)
+ return dev_err_probe(priv->dev, ret, "cannot set clock frequency\n");
+
+ ret = devm_aspeed_peci_clk_enable(priv->dev, priv->clk);
+ if (ret)
+ return dev_err_probe(priv->dev, ret, "failed to enable clock\n");
+
+ aspeed_peci_controller_enable(priv);
+
+ controller = devm_peci_controller_add(priv->dev, &aspeed_ops);
+ if (IS_ERR(controller))
+ return dev_err_probe(priv->dev, PTR_ERR(controller),
+ "failed to add aspeed peci controller\n");
+
+ priv->controller = controller;
+
+ return 0;
+}
+
+static const struct of_device_id aspeed_peci_of_table[] = {
+ { .compatible = "aspeed,ast2400-peci", },
+ { .compatible = "aspeed,ast2500-peci", },
+ { .compatible = "aspeed,ast2600-peci", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, aspeed_peci_of_table);
+
+static struct platform_driver aspeed_peci_driver = {
+ .probe = aspeed_peci_probe,
+ .driver = {
+ .name = "peci-aspeed",
+ .of_match_table = aspeed_peci_of_table,
+ },
+};
+module_platform_driver(aspeed_peci_driver);
+
+MODULE_AUTHOR("Ryan Chen <ryan_chen@aspeedtech.com>");
+MODULE_AUTHOR("Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>");
+MODULE_DESCRIPTION("ASPEED PECI driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PECI);
diff --git a/drivers/peci/controller/peci-npcm.c b/drivers/peci/controller/peci-npcm.c
new file mode 100644
index 0000000000..ec613d35c7
--- /dev/null
+++ b/drivers/peci/controller/peci-npcm.c
@@ -0,0 +1,298 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2019 Nuvoton Technology corporation
+
+#include <linux/bitfield.h>
+#include <linux/clk.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>
+#include <linux/reset.h>
+
+/* NPCM GCR module */
+#define NPCM_INTCR3_OFFSET 0x9C
+#define NPCM_INTCR3_PECIVSEL BIT(19)
+
+/* NPCM PECI Registers */
+#define NPCM_PECI_CTL_STS 0x00
+#define NPCM_PECI_RD_LENGTH 0x04
+#define NPCM_PECI_ADDR 0x08
+#define NPCM_PECI_CMD 0x0C
+#define NPCM_PECI_CTL2 0x10
+#define NPCM_PECI_WR_LENGTH 0x1C
+#define NPCM_PECI_PDDR 0x2C
+#define NPCM_PECI_DAT_INOUT(n) (0x100 + ((n) * 4))
+
+#define NPCM_PECI_MAX_REG 0x200
+
+/* NPCM_PECI_CTL_STS - 0x00 : Control Register */
+#define NPCM_PECI_CTRL_DONE_INT_EN BIT(6)
+#define NPCM_PECI_CTRL_ABRT_ERR BIT(4)
+#define NPCM_PECI_CTRL_CRC_ERR BIT(3)
+#define NPCM_PECI_CTRL_DONE BIT(1)
+#define NPCM_PECI_CTRL_START_BUSY BIT(0)
+
+/* NPCM_PECI_RD_LENGTH - 0x04 : Command Register */
+#define NPCM_PECI_RD_LEN_MASK GENMASK(6, 0)
+
+/* NPCM_PECI_CMD - 0x10 : Command Register */
+#define NPCM_PECI_CTL2_MASK GENMASK(7, 6)
+
+/* NPCM_PECI_WR_LENGTH - 0x1C : Command Register */
+#define NPCM_PECI_WR_LEN_MASK GENMASK(6, 0)
+
+/* NPCM_PECI_PDDR - 0x2C : Command Register */
+#define NPCM_PECI_PDDR_MASK GENMASK(4, 0)
+
+#define NPCM_PECI_INT_MASK (NPCM_PECI_CTRL_ABRT_ERR | \
+ NPCM_PECI_CTRL_CRC_ERR | \
+ NPCM_PECI_CTRL_DONE)
+
+#define NPCM_PECI_IDLE_CHECK_TIMEOUT_USEC (50 * USEC_PER_MSEC)
+#define NPCM_PECI_IDLE_CHECK_INTERVAL_USEC (10 * USEC_PER_MSEC)
+#define NPCM_PECI_CMD_TIMEOUT_MS_DEFAULT 1000
+#define NPCM_PECI_CMD_TIMEOUT_MS_MAX 60000
+#define NPCM_PECI_HOST_NEG_BIT_RATE_DEFAULT 15
+#define NPCM_PECI_PULL_DOWN_DEFAULT 0
+
+struct npcm_peci {
+ u32 cmd_timeout_ms;
+ struct completion xfer_complete;
+ struct regmap *regmap;
+ u32 status;
+ spinlock_t lock; /* to sync completion status handling */
+ struct peci_controller *controller;
+ struct device *dev;
+ struct clk *clk;
+ int irq;
+};
+
+static int npcm_peci_xfer(struct peci_controller *controller, u8 addr, struct peci_request *req)
+{
+ struct npcm_peci *priv = dev_get_drvdata(controller->dev.parent);
+ unsigned long timeout = msecs_to_jiffies(priv->cmd_timeout_ms);
+ unsigned int msg_rd;
+ u32 cmd_sts;
+ int i, ret;
+
+ /* Check command sts and bus idle state */
+ ret = regmap_read_poll_timeout(priv->regmap, NPCM_PECI_CTL_STS, cmd_sts,
+ !(cmd_sts & NPCM_PECI_CTRL_START_BUSY),
+ NPCM_PECI_IDLE_CHECK_INTERVAL_USEC,
+ NPCM_PECI_IDLE_CHECK_TIMEOUT_USEC);
+ if (ret)
+ return ret; /* -ETIMEDOUT */
+
+ spin_lock_irq(&priv->lock);
+ reinit_completion(&priv->xfer_complete);
+
+ regmap_write(priv->regmap, NPCM_PECI_ADDR, addr);
+ regmap_write(priv->regmap, NPCM_PECI_RD_LENGTH, NPCM_PECI_WR_LEN_MASK & req->rx.len);
+ regmap_write(priv->regmap, NPCM_PECI_WR_LENGTH, NPCM_PECI_WR_LEN_MASK & req->tx.len);
+
+ if (req->tx.len) {
+ regmap_write(priv->regmap, NPCM_PECI_CMD, req->tx.buf[0]);
+
+ for (i = 0; i < (req->tx.len - 1); i++)
+ regmap_write(priv->regmap, NPCM_PECI_DAT_INOUT(i), req->tx.buf[i + 1]);
+ }
+
+#if IS_ENABLED(CONFIG_DYNAMIC_DEBUG)
+ dev_dbg(priv->dev, "addr : %#02x, tx.len : %#02x, rx.len : %#02x\n",
+ addr, req->tx.len, req->rx.len);
+ print_hex_dump_bytes("TX : ", DUMP_PREFIX_NONE, req->tx.buf, req->tx.len);
+#endif
+
+ priv->status = 0;
+ regmap_update_bits(priv->regmap, NPCM_PECI_CTL_STS, NPCM_PECI_CTRL_START_BUSY,
+ NPCM_PECI_CTRL_START_BUSY);
+
+ spin_unlock_irq(&priv->lock);
+
+ ret = wait_for_completion_interruptible_timeout(&priv->xfer_complete, timeout);
+ if (ret < 0)
+ return ret;
+
+ if (ret == 0) {
+ dev_dbg(priv->dev, "timeout waiting for a response\n");
+ return -ETIMEDOUT;
+ }
+
+ spin_lock_irq(&priv->lock);
+
+ if (priv->status != NPCM_PECI_CTRL_DONE) {
+ spin_unlock_irq(&priv->lock);
+ dev_dbg(priv->dev, "no valid response, status: %#02x\n", priv->status);
+ return -EIO;
+ }
+
+ regmap_write(priv->regmap, NPCM_PECI_CMD, 0);
+
+ for (i = 0; i < req->rx.len; i++) {
+ regmap_read(priv->regmap, NPCM_PECI_DAT_INOUT(i), &msg_rd);
+ req->rx.buf[i] = (u8)msg_rd;
+ }
+
+ spin_unlock_irq(&priv->lock);
+
+#if IS_ENABLED(CONFIG_DYNAMIC_DEBUG)
+ print_hex_dump_bytes("RX : ", DUMP_PREFIX_NONE, req->rx.buf, req->rx.len);
+#endif
+ return 0;
+}
+
+static irqreturn_t npcm_peci_irq_handler(int irq, void *arg)
+{
+ struct npcm_peci *priv = arg;
+ u32 status_ack = 0;
+ u32 status;
+
+ spin_lock(&priv->lock);
+ regmap_read(priv->regmap, NPCM_PECI_CTL_STS, &status);
+ priv->status |= (status & NPCM_PECI_INT_MASK);
+
+ if (status & NPCM_PECI_CTRL_CRC_ERR)
+ status_ack |= NPCM_PECI_CTRL_CRC_ERR;
+
+ if (status & NPCM_PECI_CTRL_ABRT_ERR)
+ status_ack |= NPCM_PECI_CTRL_ABRT_ERR;
+
+ /*
+ * All commands should be ended up with a NPCM_PECI_CTRL_DONE
+ * bit set even in an error case.
+ */
+ if (status & NPCM_PECI_CTRL_DONE) {
+ status_ack |= NPCM_PECI_CTRL_DONE;
+ complete(&priv->xfer_complete);
+ }
+
+ regmap_write_bits(priv->regmap, NPCM_PECI_CTL_STS, NPCM_PECI_INT_MASK, status_ack);
+
+ spin_unlock(&priv->lock);
+ return IRQ_HANDLED;
+}
+
+static int npcm_peci_init_ctrl(struct npcm_peci *priv)
+{
+ u32 cmd_sts;
+ int ret;
+
+ priv->clk = devm_clk_get_enabled(priv->dev, NULL);
+ if (IS_ERR(priv->clk)) {
+ dev_err(priv->dev, "failed to get ref clock\n");
+ return PTR_ERR(priv->clk);
+ }
+
+ ret = device_property_read_u32(priv->dev, "cmd-timeout-ms", &priv->cmd_timeout_ms);
+ if (ret) {
+ priv->cmd_timeout_ms = NPCM_PECI_CMD_TIMEOUT_MS_DEFAULT;
+ } else if (priv->cmd_timeout_ms > NPCM_PECI_CMD_TIMEOUT_MS_MAX ||
+ priv->cmd_timeout_ms == 0) {
+ dev_warn(priv->dev, "invalid cmd-timeout-ms: %u, falling back to: %u\n",
+ priv->cmd_timeout_ms, NPCM_PECI_CMD_TIMEOUT_MS_DEFAULT);
+
+ priv->cmd_timeout_ms = NPCM_PECI_CMD_TIMEOUT_MS_DEFAULT;
+ }
+
+ regmap_update_bits(priv->regmap, NPCM_PECI_CTL2, NPCM_PECI_CTL2_MASK,
+ NPCM_PECI_PULL_DOWN_DEFAULT << 6);
+
+ regmap_update_bits(priv->regmap, NPCM_PECI_PDDR, NPCM_PECI_PDDR_MASK,
+ NPCM_PECI_HOST_NEG_BIT_RATE_DEFAULT);
+
+ ret = regmap_read_poll_timeout(priv->regmap, NPCM_PECI_CTL_STS, cmd_sts,
+ !(cmd_sts & NPCM_PECI_CTRL_START_BUSY),
+ NPCM_PECI_IDLE_CHECK_INTERVAL_USEC,
+ NPCM_PECI_IDLE_CHECK_TIMEOUT_USEC);
+ if (ret)
+ return ret; /* -ETIMEDOUT */
+
+ /* PECI interrupt enable */
+ regmap_update_bits(priv->regmap, NPCM_PECI_CTL_STS, NPCM_PECI_CTRL_DONE_INT_EN,
+ NPCM_PECI_CTRL_DONE_INT_EN);
+
+ return 0;
+}
+
+static const struct regmap_config npcm_peci_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = NPCM_PECI_MAX_REG,
+ .fast_io = true,
+};
+
+static struct peci_controller_ops npcm_ops = {
+ .xfer = npcm_peci_xfer,
+};
+
+static int npcm_peci_probe(struct platform_device *pdev)
+{
+ struct peci_controller *controller;
+ struct npcm_peci *priv;
+ void __iomem *base;
+ int ret;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->dev = &pdev->dev;
+ dev_set_drvdata(&pdev->dev, priv);
+
+ base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ priv->regmap = devm_regmap_init_mmio(&pdev->dev, base, &npcm_peci_regmap_config);
+ if (IS_ERR(priv->regmap))
+ return PTR_ERR(priv->regmap);
+
+ priv->irq = platform_get_irq(pdev, 0);
+ if (priv->irq < 0)
+ return priv->irq;
+
+ ret = devm_request_irq(&pdev->dev, priv->irq, npcm_peci_irq_handler,
+ 0, "peci-npcm-irq", priv);
+ if (ret)
+ return ret;
+
+ init_completion(&priv->xfer_complete);
+ spin_lock_init(&priv->lock);
+
+ ret = npcm_peci_init_ctrl(priv);
+ if (ret)
+ return ret;
+
+ controller = devm_peci_controller_add(priv->dev, &npcm_ops);
+ if (IS_ERR(controller))
+ return dev_err_probe(priv->dev, PTR_ERR(controller),
+ "failed to add npcm peci controller\n");
+
+ priv->controller = controller;
+
+ return 0;
+}
+
+static const struct of_device_id npcm_peci_of_table[] = {
+ { .compatible = "nuvoton,npcm750-peci", },
+ { .compatible = "nuvoton,npcm845-peci", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, npcm_peci_of_table);
+
+static struct platform_driver npcm_peci_driver = {
+ .probe = npcm_peci_probe,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = npcm_peci_of_table,
+ },
+};
+module_platform_driver(npcm_peci_driver);
+
+MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
+MODULE_DESCRIPTION("NPCM PECI driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PECI);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-29 17:26:29 +0000