Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 768 insertions, 0 deletions

diff --git a/drivers/soc/qcom/qcom-geni-se.c b/drivers/soc/qcom/qcom-geni-se.c
new file mode 100644
index 000000000..7369b0619
--- /dev/null
+++ b/drivers/soc/qcom/qcom-geni-se.c
@@ -0,0 +1,768 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
+
+#include <linux/clk.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/qcom-geni-se.h>
+
+/**
+ * DOC: Overview
+ *
+ * Generic Interface (GENI) Serial Engine (SE) Wrapper driver is introduced
+ * to manage GENI firmware based Qualcomm Universal Peripheral (QUP) Wrapper
+ * controller. QUP Wrapper is designed to support various serial bus protocols
+ * like UART, SPI, I2C, I3C, etc.
+ */
+
+/**
+ * DOC: Hardware description
+ *
+ * GENI based QUP is a highly-flexible and programmable module for supporting
+ * a wide range of serial interfaces like UART, SPI, I2C, I3C, etc. A single
+ * QUP module can provide upto 8 serial interfaces, using its internal
+ * serial engines. The actual configuration is determined by the target
+ * platform configuration. The protocol supported by each interface is
+ * determined by the firmware loaded to the serial engine. Each SE consists
+ * of a DMA Engine and GENI sub modules which enable serial engines to
+ * support FIFO and DMA modes of operation.
+ *
+ *
+ *                      +-----------------------------------------+
+ *                      |QUP Wrapper                              |
+ *                      |         +----------------------------+  |
+ *   --QUP & SE Clocks-->         | Serial Engine N            |  +-IO------>
+ *                      |         | ...                        |  | Interface
+ *   <---Clock Perf.----+    +----+-----------------------+    |  |
+ *     State Interface  |    | Serial Engine 1            |    |  |
+ *                      |    |                            |    |  |
+ *                      |    |                            |    |  |
+ *   <--------AHB------->    |                            |    |  |
+ *                      |    |                            +----+  |
+ *                      |    |                            |       |
+ *                      |    |                            |       |
+ *   <------SE IRQ------+    +----------------------------+       |
+ *                      |                                         |
+ *                      +-----------------------------------------+
+ *
+ *                         Figure 1: GENI based QUP Wrapper
+ *
+ * The GENI submodules include primary and secondary sequencers which are
+ * used to drive TX & RX operations. On serial interfaces that operate using
+ * master-slave model, primary sequencer drives both TX & RX operations. On
+ * serial interfaces that operate using peer-to-peer model, primary sequencer
+ * drives TX operation and secondary sequencer drives RX operation.
+ */
+
+/**
+ * DOC: Software description
+ *
+ * GENI SE Wrapper driver is structured into 2 parts:
+ *
+ * geni_wrapper represents QUP Wrapper controller. This part of the driver
+ * manages QUP Wrapper information such as hardware version, clock
+ * performance table that is common to all the internal serial engines.
+ *
+ * geni_se represents serial engine. This part of the driver manages serial
+ * engine information such as clocks, containing QUP Wrapper, etc. This part
+ * of driver also supports operations (eg. initialize the concerned serial
+ * engine, select between FIFO and DMA mode of operation etc.) that are
+ * common to all the serial engines and are independent of serial interfaces.
+ */
+
+#define MAX_CLK_PERF_LEVEL 32
+#define NUM_AHB_CLKS 2
+
+/**
+ * @struct geni_wrapper - Data structure to represent the QUP Wrapper Core
+ * @dev:		Device pointer of the QUP wrapper core
+ * @base:		Base address of this instance of QUP wrapper core
+ * @ahb_clks:		Handle to the primary & secondary AHB clocks
+ */
+struct geni_wrapper {
+	struct device *dev;
+	void __iomem *base;
+	struct clk_bulk_data ahb_clks[NUM_AHB_CLKS];
+};
+
+#define QUP_HW_VER_REG			0x4
+
+/* Common SE registers */
+#define GENI_INIT_CFG_REVISION		0x0
+#define GENI_S_INIT_CFG_REVISION	0x4
+#define GENI_OUTPUT_CTRL		0x24
+#define GENI_CGC_CTRL			0x28
+#define GENI_CLK_CTRL_RO		0x60
+#define GENI_IF_DISABLE_RO		0x64
+#define GENI_FW_S_REVISION_RO		0x6c
+#define SE_GENI_BYTE_GRAN		0x254
+#define SE_GENI_TX_PACKING_CFG0		0x260
+#define SE_GENI_TX_PACKING_CFG1		0x264
+#define SE_GENI_RX_PACKING_CFG0		0x284
+#define SE_GENI_RX_PACKING_CFG1		0x288
+#define SE_GENI_M_GP_LENGTH		0x910
+#define SE_GENI_S_GP_LENGTH		0x914
+#define SE_DMA_TX_PTR_L			0xc30
+#define SE_DMA_TX_PTR_H			0xc34
+#define SE_DMA_TX_ATTR			0xc38
+#define SE_DMA_TX_LEN			0xc3c
+#define SE_DMA_TX_IRQ_EN		0xc48
+#define SE_DMA_TX_IRQ_EN_SET		0xc4c
+#define SE_DMA_TX_IRQ_EN_CLR		0xc50
+#define SE_DMA_TX_LEN_IN		0xc54
+#define SE_DMA_TX_MAX_BURST		0xc5c
+#define SE_DMA_RX_PTR_L			0xd30
+#define SE_DMA_RX_PTR_H			0xd34
+#define SE_DMA_RX_ATTR			0xd38
+#define SE_DMA_RX_LEN			0xd3c
+#define SE_DMA_RX_IRQ_EN		0xd48
+#define SE_DMA_RX_IRQ_EN_SET		0xd4c
+#define SE_DMA_RX_IRQ_EN_CLR		0xd50
+#define SE_DMA_RX_LEN_IN		0xd54
+#define SE_DMA_RX_MAX_BURST		0xd5c
+#define SE_DMA_RX_FLUSH			0xd60
+#define SE_GSI_EVENT_EN			0xe18
+#define SE_IRQ_EN			0xe1c
+#define SE_DMA_GENERAL_CFG		0xe30
+
+/* GENI_OUTPUT_CTRL fields */
+#define DEFAULT_IO_OUTPUT_CTRL_MSK	GENMASK(6, 0)
+
+/* GENI_CGC_CTRL fields */
+#define CFG_AHB_CLK_CGC_ON		BIT(0)
+#define CFG_AHB_WR_ACLK_CGC_ON		BIT(1)
+#define DATA_AHB_CLK_CGC_ON		BIT(2)
+#define SCLK_CGC_ON			BIT(3)
+#define TX_CLK_CGC_ON			BIT(4)
+#define RX_CLK_CGC_ON			BIT(5)
+#define EXT_CLK_CGC_ON			BIT(6)
+#define PROG_RAM_HCLK_OFF		BIT(8)
+#define PROG_RAM_SCLK_OFF		BIT(9)
+#define DEFAULT_CGC_EN			GENMASK(6, 0)
+
+/* SE_GSI_EVENT_EN fields */
+#define DMA_RX_EVENT_EN			BIT(0)
+#define DMA_TX_EVENT_EN			BIT(1)
+#define GENI_M_EVENT_EN			BIT(2)
+#define GENI_S_EVENT_EN			BIT(3)
+
+/* SE_IRQ_EN fields */
+#define DMA_RX_IRQ_EN			BIT(0)
+#define DMA_TX_IRQ_EN			BIT(1)
+#define GENI_M_IRQ_EN			BIT(2)
+#define GENI_S_IRQ_EN			BIT(3)
+
+/* SE_DMA_GENERAL_CFG */
+#define DMA_RX_CLK_CGC_ON		BIT(0)
+#define DMA_TX_CLK_CGC_ON		BIT(1)
+#define DMA_AHB_SLV_CFG_ON		BIT(2)
+#define AHB_SEC_SLV_CLK_CGC_ON		BIT(3)
+#define DUMMY_RX_NON_BUFFERABLE		BIT(4)
+#define RX_DMA_ZERO_PADDING_EN		BIT(5)
+#define RX_DMA_IRQ_DELAY_MSK		GENMASK(8, 6)
+#define RX_DMA_IRQ_DELAY_SHFT		6
+
+/**
+ * geni_se_get_qup_hw_version() - Read the QUP wrapper Hardware version
+ * @se:	Pointer to the corresponding serial engine.
+ *
+ * Return: Hardware Version of the wrapper.
+ */
+u32 geni_se_get_qup_hw_version(struct geni_se *se)
+{
+	struct geni_wrapper *wrapper = se->wrapper;
+
+	return readl_relaxed(wrapper->base + QUP_HW_VER_REG);
+}
+EXPORT_SYMBOL(geni_se_get_qup_hw_version);
+
+static void geni_se_io_set_mode(void __iomem *base)
+{
+	u32 val;
+
+	val = readl_relaxed(base + SE_IRQ_EN);
+	val |= GENI_M_IRQ_EN | GENI_S_IRQ_EN;
+	val |= DMA_TX_IRQ_EN | DMA_RX_IRQ_EN;
+	writel_relaxed(val, base + SE_IRQ_EN);
+
+	val = readl_relaxed(base + SE_GENI_DMA_MODE_EN);
+	val &= ~GENI_DMA_MODE_EN;
+	writel_relaxed(val, base + SE_GENI_DMA_MODE_EN);
+
+	writel_relaxed(0, base + SE_GSI_EVENT_EN);
+}
+
+static void geni_se_io_init(void __iomem *base)
+{
+	u32 val;
+
+	val = readl_relaxed(base + GENI_CGC_CTRL);
+	val |= DEFAULT_CGC_EN;
+	writel_relaxed(val, base + GENI_CGC_CTRL);
+
+	val = readl_relaxed(base + SE_DMA_GENERAL_CFG);
+	val |= AHB_SEC_SLV_CLK_CGC_ON | DMA_AHB_SLV_CFG_ON;
+	val |= DMA_TX_CLK_CGC_ON | DMA_RX_CLK_CGC_ON;
+	writel_relaxed(val, base + SE_DMA_GENERAL_CFG);
+
+	writel_relaxed(DEFAULT_IO_OUTPUT_CTRL_MSK, base + GENI_OUTPUT_CTRL);
+	writel_relaxed(FORCE_DEFAULT, base + GENI_FORCE_DEFAULT_REG);
+}
+
+/**
+ * geni_se_init() - Initialize the GENI serial engine
+ * @se:		Pointer to the concerned serial engine.
+ * @rx_wm:	Receive watermark, in units of FIFO words.
+ * @rx_rfr_wm:	Ready-for-receive watermark, in units of FIFO words.
+ *
+ * This function is used to initialize the GENI serial engine, configure
+ * receive watermark and ready-for-receive watermarks.
+ */
+void geni_se_init(struct geni_se *se, u32 rx_wm, u32 rx_rfr)
+{
+	u32 val;
+
+	geni_se_io_init(se->base);
+	geni_se_io_set_mode(se->base);
+
+	writel_relaxed(rx_wm, se->base + SE_GENI_RX_WATERMARK_REG);
+	writel_relaxed(rx_rfr, se->base + SE_GENI_RX_RFR_WATERMARK_REG);
+
+	val = readl_relaxed(se->base + SE_GENI_M_IRQ_EN);
+	val |= M_COMMON_GENI_M_IRQ_EN;
+	writel_relaxed(val, se->base + SE_GENI_M_IRQ_EN);
+
+	val = readl_relaxed(se->base + SE_GENI_S_IRQ_EN);
+	val |= S_COMMON_GENI_S_IRQ_EN;
+	writel_relaxed(val, se->base + SE_GENI_S_IRQ_EN);
+}
+EXPORT_SYMBOL(geni_se_init);
+
+static void geni_se_select_fifo_mode(struct geni_se *se)
+{
+	u32 proto = geni_se_read_proto(se);
+	u32 val;
+
+	writel_relaxed(0, se->base + SE_GSI_EVENT_EN);
+	writel_relaxed(0xffffffff, se->base + SE_GENI_M_IRQ_CLEAR);
+	writel_relaxed(0xffffffff, se->base + SE_GENI_S_IRQ_CLEAR);
+	writel_relaxed(0xffffffff, se->base + SE_DMA_TX_IRQ_CLR);
+	writel_relaxed(0xffffffff, se->base + SE_DMA_RX_IRQ_CLR);
+	writel_relaxed(0xffffffff, se->base + SE_IRQ_EN);
+
+	val = readl_relaxed(se->base + SE_GENI_M_IRQ_EN);
+	if (proto != GENI_SE_UART) {
+		val |= M_CMD_DONE_EN | M_TX_FIFO_WATERMARK_EN;
+		val |= M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN;
+	}
+	writel_relaxed(val, se->base + SE_GENI_M_IRQ_EN);
+
+	val = readl_relaxed(se->base + SE_GENI_S_IRQ_EN);
+	if (proto != GENI_SE_UART)
+		val |= S_CMD_DONE_EN;
+	writel_relaxed(val, se->base + SE_GENI_S_IRQ_EN);
+
+	val = readl_relaxed(se->base + SE_GENI_DMA_MODE_EN);
+	val &= ~GENI_DMA_MODE_EN;
+	writel_relaxed(val, se->base + SE_GENI_DMA_MODE_EN);
+}
+
+static void geni_se_select_dma_mode(struct geni_se *se)
+{
+	u32 proto = geni_se_read_proto(se);
+	u32 val;
+
+	writel_relaxed(0, se->base + SE_GSI_EVENT_EN);
+	writel_relaxed(0xffffffff, se->base + SE_GENI_M_IRQ_CLEAR);
+	writel_relaxed(0xffffffff, se->base + SE_GENI_S_IRQ_CLEAR);
+	writel_relaxed(0xffffffff, se->base + SE_DMA_TX_IRQ_CLR);
+	writel_relaxed(0xffffffff, se->base + SE_DMA_RX_IRQ_CLR);
+	writel_relaxed(0xffffffff, se->base + SE_IRQ_EN);
+
+	val = readl_relaxed(se->base + SE_GENI_M_IRQ_EN);
+	if (proto != GENI_SE_UART) {
+		val &= ~(M_CMD_DONE_EN | M_TX_FIFO_WATERMARK_EN);
+		val &= ~(M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN);
+	}
+	writel_relaxed(val, se->base + SE_GENI_M_IRQ_EN);
+
+	val = readl_relaxed(se->base + SE_GENI_S_IRQ_EN);
+	if (proto != GENI_SE_UART)
+		val &= ~S_CMD_DONE_EN;
+	writel_relaxed(val, se->base + SE_GENI_S_IRQ_EN);
+
+	val = readl_relaxed(se->base + SE_GENI_DMA_MODE_EN);
+	val |= GENI_DMA_MODE_EN;
+	writel_relaxed(val, se->base + SE_GENI_DMA_MODE_EN);
+}
+
+/**
+ * geni_se_select_mode() - Select the serial engine transfer mode
+ * @se:		Pointer to the concerned serial engine.
+ * @mode:	Transfer mode to be selected.
+ */
+void geni_se_select_mode(struct geni_se *se, enum geni_se_xfer_mode mode)
+{
+	WARN_ON(mode != GENI_SE_FIFO && mode != GENI_SE_DMA);
+
+	switch (mode) {
+	case GENI_SE_FIFO:
+		geni_se_select_fifo_mode(se);
+		break;
+	case GENI_SE_DMA:
+		geni_se_select_dma_mode(se);
+		break;
+	case GENI_SE_INVALID:
+	default:
+		break;
+	}
+}
+EXPORT_SYMBOL(geni_se_select_mode);
+
+/**
+ * DOC: Overview
+ *
+ * GENI FIFO packing is highly configurable. TX/RX packing/unpacking consist
+ * of up to 4 operations, each operation represented by 4 configuration vectors
+ * of 10 bits programmed in GENI_TX_PACKING_CFG0 and GENI_TX_PACKING_CFG1 for
+ * TX FIFO and in GENI_RX_PACKING_CFG0 and GENI_RX_PACKING_CFG1 for RX FIFO.
+ * Refer to below examples for detailed bit-field description.
+ *
+ * Example 1: word_size = 7, packing_mode = 4 x 8, msb_to_lsb = 1
+ *
+ *        +-----------+-------+-------+-------+-------+
+ *        |           | vec_0 | vec_1 | vec_2 | vec_3 |
+ *        +-----------+-------+-------+-------+-------+
+ *        | start     | 0x6   | 0xe   | 0x16  | 0x1e  |
+ *        | direction | 1     | 1     | 1     | 1     |
+ *        | length    | 6     | 6     | 6     | 6     |
+ *        | stop      | 0     | 0     | 0     | 1     |
+ *        +-----------+-------+-------+-------+-------+
+ *
+ * Example 2: word_size = 15, packing_mode = 2 x 16, msb_to_lsb = 0
+ *
+ *        +-----------+-------+-------+-------+-------+
+ *        |           | vec_0 | vec_1 | vec_2 | vec_3 |
+ *        +-----------+-------+-------+-------+-------+
+ *        | start     | 0x0   | 0x8   | 0x10  | 0x18  |
+ *        | direction | 0     | 0     | 0     | 0     |
+ *        | length    | 7     | 6     | 7     | 6     |
+ *        | stop      | 0     | 0     | 0     | 1     |
+ *        +-----------+-------+-------+-------+-------+
+ *
+ * Example 3: word_size = 23, packing_mode = 1 x 32, msb_to_lsb = 1
+ *
+ *        +-----------+-------+-------+-------+-------+
+ *        |           | vec_0 | vec_1 | vec_2 | vec_3 |
+ *        +-----------+-------+-------+-------+-------+
+ *        | start     | 0x16  | 0xe   | 0x6   | 0x0   |
+ *        | direction | 1     | 1     | 1     | 1     |
+ *        | length    | 7     | 7     | 6     | 0     |
+ *        | stop      | 0     | 0     | 1     | 0     |
+ *        +-----------+-------+-------+-------+-------+
+ *
+ */
+
+#define NUM_PACKING_VECTORS 4
+#define PACKING_START_SHIFT 5
+#define PACKING_DIR_SHIFT 4
+#define PACKING_LEN_SHIFT 1
+#define PACKING_STOP_BIT BIT(0)
+#define PACKING_VECTOR_SHIFT 10
+/**
+ * geni_se_config_packing() - Packing configuration of the serial engine
+ * @se:		Pointer to the concerned serial engine
+ * @bpw:	Bits of data per transfer word.
+ * @pack_words:	Number of words per fifo element.
+ * @msb_to_lsb:	Transfer from MSB to LSB or vice-versa.
+ * @tx_cfg:	Flag to configure the TX Packing.
+ * @rx_cfg:	Flag to configure the RX Packing.
+ *
+ * This function is used to configure the packing rules for the current
+ * transfer.
+ */
+void geni_se_config_packing(struct geni_se *se, int bpw, int pack_words,
+			    bool msb_to_lsb, bool tx_cfg, bool rx_cfg)
+{
+	u32 cfg0, cfg1, cfg[NUM_PACKING_VECTORS] = {0};
+	int len;
+	int temp_bpw = bpw;
+	int idx_start = msb_to_lsb ? bpw - 1 : 0;
+	int idx = idx_start;
+	int idx_delta = msb_to_lsb ? -BITS_PER_BYTE : BITS_PER_BYTE;
+	int ceil_bpw = ALIGN(bpw, BITS_PER_BYTE);
+	int iter = (ceil_bpw * pack_words) / BITS_PER_BYTE;
+	int i;
+
+	if (iter <= 0 || iter > NUM_PACKING_VECTORS)
+		return;
+
+	for (i = 0; i < iter; i++) {
+		len = min_t(int, temp_bpw, BITS_PER_BYTE) - 1;
+		cfg[i] = idx << PACKING_START_SHIFT;
+		cfg[i] |= msb_to_lsb << PACKING_DIR_SHIFT;
+		cfg[i] |= len << PACKING_LEN_SHIFT;
+
+		if (temp_bpw <= BITS_PER_BYTE) {
+			idx = ((i + 1) * BITS_PER_BYTE) + idx_start;
+			temp_bpw = bpw;
+		} else {
+			idx = idx + idx_delta;
+			temp_bpw = temp_bpw - BITS_PER_BYTE;
+		}
+	}
+	cfg[iter - 1] |= PACKING_STOP_BIT;
+	cfg0 = cfg[0] | (cfg[1] << PACKING_VECTOR_SHIFT);
+	cfg1 = cfg[2] | (cfg[3] << PACKING_VECTOR_SHIFT);
+
+	if (tx_cfg) {
+		writel_relaxed(cfg0, se->base + SE_GENI_TX_PACKING_CFG0);
+		writel_relaxed(cfg1, se->base + SE_GENI_TX_PACKING_CFG1);
+	}
+	if (rx_cfg) {
+		writel_relaxed(cfg0, se->base + SE_GENI_RX_PACKING_CFG0);
+		writel_relaxed(cfg1, se->base + SE_GENI_RX_PACKING_CFG1);
+	}
+
+	/*
+	 * Number of protocol words in each FIFO entry
+	 * 0 - 4x8, four words in each entry, max word size of 8 bits
+	 * 1 - 2x16, two words in each entry, max word size of 16 bits
+	 * 2 - 1x32, one word in each entry, max word size of 32 bits
+	 * 3 - undefined
+	 */
+	if (pack_words || bpw == 32)
+		writel_relaxed(bpw / 16, se->base + SE_GENI_BYTE_GRAN);
+}
+EXPORT_SYMBOL(geni_se_config_packing);
+
+static void geni_se_clks_off(struct geni_se *se)
+{
+	struct geni_wrapper *wrapper = se->wrapper;
+
+	clk_disable_unprepare(se->clk);
+	clk_bulk_disable_unprepare(ARRAY_SIZE(wrapper->ahb_clks),
+						wrapper->ahb_clks);
+}
+
+/**
+ * geni_se_resources_off() - Turn off resources associated with the serial
+ *                           engine
+ * @se:	Pointer to the concerned serial engine.
+ *
+ * Return: 0 on success, standard Linux error codes on failure/error.
+ */
+int geni_se_resources_off(struct geni_se *se)
+{
+	int ret;
+
+	ret = pinctrl_pm_select_sleep_state(se->dev);
+	if (ret)
+		return ret;
+
+	geni_se_clks_off(se);
+	return 0;
+}
+EXPORT_SYMBOL(geni_se_resources_off);
+
+static int geni_se_clks_on(struct geni_se *se)
+{
+	int ret;
+	struct geni_wrapper *wrapper = se->wrapper;
+
+	ret = clk_bulk_prepare_enable(ARRAY_SIZE(wrapper->ahb_clks),
+						wrapper->ahb_clks);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(se->clk);
+	if (ret)
+		clk_bulk_disable_unprepare(ARRAY_SIZE(wrapper->ahb_clks),
+							wrapper->ahb_clks);
+	return ret;
+}
+
+/**
+ * geni_se_resources_on() - Turn on resources associated with the serial
+ *                          engine
+ * @se:	Pointer to the concerned serial engine.
+ *
+ * Return: 0 on success, standard Linux error codes on failure/error.
+ */
+int geni_se_resources_on(struct geni_se *se)
+{
+	int ret;
+
+	ret = geni_se_clks_on(se);
+	if (ret)
+		return ret;
+
+	ret = pinctrl_pm_select_default_state(se->dev);
+	if (ret)
+		geni_se_clks_off(se);
+
+	return ret;
+}
+EXPORT_SYMBOL(geni_se_resources_on);
+
+/**
+ * geni_se_clk_tbl_get() - Get the clock table to program DFS
+ * @se:		Pointer to the concerned serial engine.
+ * @tbl:	Table in which the output is returned.
+ *
+ * This function is called by the protocol drivers to determine the different
+ * clock frequencies supported by serial engine core clock. The protocol
+ * drivers use the output to determine the clock frequency index to be
+ * programmed into DFS.
+ *
+ * Return: number of valid performance levels in the table on success,
+ *	   standard Linux error codes on failure.
+ */
+int geni_se_clk_tbl_get(struct geni_se *se, unsigned long **tbl)
+{
+	long freq = 0;
+	int i;
+
+	if (se->clk_perf_tbl) {
+		*tbl = se->clk_perf_tbl;
+		return se->num_clk_levels;
+	}
+
+	se->clk_perf_tbl = devm_kcalloc(se->dev, MAX_CLK_PERF_LEVEL,
+					sizeof(*se->clk_perf_tbl),
+					GFP_KERNEL);
+	if (!se->clk_perf_tbl)
+		return -ENOMEM;
+
+	for (i = 0; i < MAX_CLK_PERF_LEVEL; i++) {
+		freq = clk_round_rate(se->clk, freq + 1);
+		if (freq <= 0 || freq == se->clk_perf_tbl[i - 1])
+			break;
+		se->clk_perf_tbl[i] = freq;
+	}
+	se->num_clk_levels = i;
+	*tbl = se->clk_perf_tbl;
+	return se->num_clk_levels;
+}
+EXPORT_SYMBOL(geni_se_clk_tbl_get);
+
+/**
+ * geni_se_clk_freq_match() - Get the matching or closest SE clock frequency
+ * @se:		Pointer to the concerned serial engine.
+ * @req_freq:	Requested clock frequency.
+ * @index:	Index of the resultant frequency in the table.
+ * @res_freq:	Resultant frequency of the source clock.
+ * @exact:	Flag to indicate exact multiple requirement of the requested
+ *		frequency.
+ *
+ * This function is called by the protocol drivers to determine the best match
+ * of the requested frequency as provided by the serial engine clock in order
+ * to meet the performance requirements.
+ *
+ * If we return success:
+ * - if @exact is true  then @res_freq / <an_integer> == @req_freq
+ * - if @exact is false then @res_freq / <an_integer> <= @req_freq
+ *
+ * Return: 0 on success, standard Linux error codes on failure.
+ */
+int geni_se_clk_freq_match(struct geni_se *se, unsigned long req_freq,
+			   unsigned int *index, unsigned long *res_freq,
+			   bool exact)
+{
+	unsigned long *tbl;
+	int num_clk_levels;
+	int i;
+	unsigned long best_delta;
+	unsigned long new_delta;
+	unsigned int divider;
+
+	num_clk_levels = geni_se_clk_tbl_get(se, &tbl);
+	if (num_clk_levels < 0)
+		return num_clk_levels;
+
+	if (num_clk_levels == 0)
+		return -EINVAL;
+
+	best_delta = ULONG_MAX;
+	for (i = 0; i < num_clk_levels; i++) {
+		divider = DIV_ROUND_UP(tbl[i], req_freq);
+		new_delta = req_freq - tbl[i] / divider;
+		if (new_delta < best_delta) {
+			/* We have a new best! */
+			*index = i;
+			*res_freq = tbl[i];
+
+			/* If the new best is exact then we're done */
+			if (new_delta == 0)
+				return 0;
+
+			/* Record how close we got */
+			best_delta = new_delta;
+		}
+	}
+
+	if (exact)
+		return -EINVAL;
+
+	return 0;
+}
+EXPORT_SYMBOL(geni_se_clk_freq_match);
+
+#define GENI_SE_DMA_DONE_EN BIT(0)
+#define GENI_SE_DMA_EOT_EN BIT(1)
+#define GENI_SE_DMA_AHB_ERR_EN BIT(2)
+#define GENI_SE_DMA_EOT_BUF BIT(0)
+/**
+ * geni_se_tx_dma_prep() - Prepare the serial engine for TX DMA transfer
+ * @se:			Pointer to the concerned serial engine.
+ * @buf:		Pointer to the TX buffer.
+ * @len:		Length of the TX buffer.
+ * @iova:		Pointer to store the mapped DMA address.
+ *
+ * This function is used to prepare the buffers for DMA TX.
+ *
+ * Return: 0 on success, standard Linux error codes on failure.
+ */
+int geni_se_tx_dma_prep(struct geni_se *se, void *buf, size_t len,
+			dma_addr_t *iova)
+{
+	struct geni_wrapper *wrapper = se->wrapper;
+	u32 val;
+
+	*iova = dma_map_single(wrapper->dev, buf, len, DMA_TO_DEVICE);
+	if (dma_mapping_error(wrapper->dev, *iova))
+		return -EIO;
+
+	val = GENI_SE_DMA_DONE_EN;
+	val |= GENI_SE_DMA_EOT_EN;
+	val |= GENI_SE_DMA_AHB_ERR_EN;
+	writel_relaxed(val, se->base + SE_DMA_TX_IRQ_EN_SET);
+	writel_relaxed(lower_32_bits(*iova), se->base + SE_DMA_TX_PTR_L);
+	writel_relaxed(upper_32_bits(*iova), se->base + SE_DMA_TX_PTR_H);
+	writel_relaxed(GENI_SE_DMA_EOT_BUF, se->base + SE_DMA_TX_ATTR);
+	writel(len, se->base + SE_DMA_TX_LEN);
+	return 0;
+}
+EXPORT_SYMBOL(geni_se_tx_dma_prep);
+
+/**
+ * geni_se_rx_dma_prep() - Prepare the serial engine for RX DMA transfer
+ * @se:			Pointer to the concerned serial engine.
+ * @buf:		Pointer to the RX buffer.
+ * @len:		Length of the RX buffer.
+ * @iova:		Pointer to store the mapped DMA address.
+ *
+ * This function is used to prepare the buffers for DMA RX.
+ *
+ * Return: 0 on success, standard Linux error codes on failure.
+ */
+int geni_se_rx_dma_prep(struct geni_se *se, void *buf, size_t len,
+			dma_addr_t *iova)
+{
+	struct geni_wrapper *wrapper = se->wrapper;
+	u32 val;
+
+	*iova = dma_map_single(wrapper->dev, buf, len, DMA_FROM_DEVICE);
+	if (dma_mapping_error(wrapper->dev, *iova))
+		return -EIO;
+
+	val = GENI_SE_DMA_DONE_EN;
+	val |= GENI_SE_DMA_EOT_EN;
+	val |= GENI_SE_DMA_AHB_ERR_EN;
+	writel_relaxed(val, se->base + SE_DMA_RX_IRQ_EN_SET);
+	writel_relaxed(lower_32_bits(*iova), se->base + SE_DMA_RX_PTR_L);
+	writel_relaxed(upper_32_bits(*iova), se->base + SE_DMA_RX_PTR_H);
+	/* RX does not have EOT buffer type bit. So just reset RX_ATTR */
+	writel_relaxed(0, se->base + SE_DMA_RX_ATTR);
+	writel(len, se->base + SE_DMA_RX_LEN);
+	return 0;
+}
+EXPORT_SYMBOL(geni_se_rx_dma_prep);
+
+/**
+ * geni_se_tx_dma_unprep() - Unprepare the serial engine after TX DMA transfer
+ * @se:			Pointer to the concerned serial engine.
+ * @iova:		DMA address of the TX buffer.
+ * @len:		Length of the TX buffer.
+ *
+ * This function is used to unprepare the DMA buffers after DMA TX.
+ */
+void geni_se_tx_dma_unprep(struct geni_se *se, dma_addr_t iova, size_t len)
+{
+	struct geni_wrapper *wrapper = se->wrapper;
+
+	if (iova && !dma_mapping_error(wrapper->dev, iova))
+		dma_unmap_single(wrapper->dev, iova, len, DMA_TO_DEVICE);
+}
+EXPORT_SYMBOL(geni_se_tx_dma_unprep);
+
+/**
+ * geni_se_rx_dma_unprep() - Unprepare the serial engine after RX DMA transfer
+ * @se:			Pointer to the concerned serial engine.
+ * @iova:		DMA address of the RX buffer.
+ * @len:		Length of the RX buffer.
+ *
+ * This function is used to unprepare the DMA buffers after DMA RX.
+ */
+void geni_se_rx_dma_unprep(struct geni_se *se, dma_addr_t iova, size_t len)
+{
+	struct geni_wrapper *wrapper = se->wrapper;
+
+	if (iova && !dma_mapping_error(wrapper->dev, iova))
+		dma_unmap_single(wrapper->dev, iova, len, DMA_FROM_DEVICE);
+}
+EXPORT_SYMBOL(geni_se_rx_dma_unprep);
+
+static int geni_se_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct geni_wrapper *wrapper;
+	int ret;
+
+	wrapper = devm_kzalloc(dev, sizeof(*wrapper), GFP_KERNEL);
+	if (!wrapper)
+		return -ENOMEM;
+
+	wrapper->dev = dev;
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	wrapper->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(wrapper->base))
+		return PTR_ERR(wrapper->base);
+
+	wrapper->ahb_clks[0].id = "m-ahb";
+	wrapper->ahb_clks[1].id = "s-ahb";
+	ret = devm_clk_bulk_get(dev, NUM_AHB_CLKS, wrapper->ahb_clks);
+	if (ret) {
+		dev_err(dev, "Err getting AHB clks %d\n", ret);
+		return ret;
+	}
+
+	dev_set_drvdata(dev, wrapper);
+	dev_dbg(dev, "GENI SE Driver probed\n");
+	return devm_of_platform_populate(dev);
+}
+
+static const struct of_device_id geni_se_dt_match[] = {
+	{ .compatible = "qcom,geni-se-qup", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, geni_se_dt_match);
+
+static struct platform_driver geni_se_driver = {
+	.driver = {
+		.name = "geni_se_qup",
+		.of_match_table = geni_se_dt_match,
+	},
+	.probe = geni_se_probe,
+};
+module_platform_driver(geni_se_driver);
+
+MODULE_DESCRIPTION("GENI Serial Engine Driver");
+MODULE_LICENSE("GPL v2");