1 files changed, 1086 insertions, 0 deletions

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
new file mode 100644
index 000000000..79242dc52
--- /dev/null
+++ b/drivers/spi/spi-rockchip.c
@@ -0,0 +1,1086 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
+ * Author: Addy Ke <addy.ke@rock-chips.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/dmaengine.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/spi/spi.h>
+#include <linux/pm_runtime.h>
+#include <linux/scatterlist.h>
+
+#define DRIVER_NAME "rockchip-spi"
+
+#define ROCKCHIP_SPI_CLR_BITS(reg, bits) \
+		writel_relaxed(readl_relaxed(reg) & ~(bits), reg)
+#define ROCKCHIP_SPI_SET_BITS(reg, bits) \
+		writel_relaxed(readl_relaxed(reg) | (bits), reg)
+
+/* SPI register offsets */
+#define ROCKCHIP_SPI_CTRLR0			0x0000
+#define ROCKCHIP_SPI_CTRLR1			0x0004
+#define ROCKCHIP_SPI_SSIENR			0x0008
+#define ROCKCHIP_SPI_SER			0x000c
+#define ROCKCHIP_SPI_BAUDR			0x0010
+#define ROCKCHIP_SPI_TXFTLR			0x0014
+#define ROCKCHIP_SPI_RXFTLR			0x0018
+#define ROCKCHIP_SPI_TXFLR			0x001c
+#define ROCKCHIP_SPI_RXFLR			0x0020
+#define ROCKCHIP_SPI_SR				0x0024
+#define ROCKCHIP_SPI_IPR			0x0028
+#define ROCKCHIP_SPI_IMR			0x002c
+#define ROCKCHIP_SPI_ISR			0x0030
+#define ROCKCHIP_SPI_RISR			0x0034
+#define ROCKCHIP_SPI_ICR			0x0038
+#define ROCKCHIP_SPI_DMACR			0x003c
+#define ROCKCHIP_SPI_DMATDLR			0x0040
+#define ROCKCHIP_SPI_DMARDLR			0x0044
+#define ROCKCHIP_SPI_VERSION			0x0048
+#define ROCKCHIP_SPI_TXDR			0x0400
+#define ROCKCHIP_SPI_RXDR			0x0800
+
+/* Bit fields in CTRLR0 */
+#define CR0_DFS_OFFSET				0
+#define CR0_DFS_4BIT				0x0
+#define CR0_DFS_8BIT				0x1
+#define CR0_DFS_16BIT				0x2
+
+#define CR0_CFS_OFFSET				2
+
+#define CR0_SCPH_OFFSET				6
+
+#define CR0_SCPOL_OFFSET			7
+
+#define CR0_CSM_OFFSET				8
+#define CR0_CSM_KEEP				0x0
+/* ss_n be high for half sclk_out cycles */
+#define CR0_CSM_HALF				0X1
+/* ss_n be high for one sclk_out cycle */
+#define CR0_CSM_ONE					0x2
+
+/* ss_n to sclk_out delay */
+#define CR0_SSD_OFFSET				10
+/*
+ * The period between ss_n active and
+ * sclk_out active is half sclk_out cycles
+ */
+#define CR0_SSD_HALF				0x0
+/*
+ * The period between ss_n active and
+ * sclk_out active is one sclk_out cycle
+ */
+#define CR0_SSD_ONE					0x1
+
+#define CR0_EM_OFFSET				11
+#define CR0_EM_LITTLE				0x0
+#define CR0_EM_BIG					0x1
+
+#define CR0_FBM_OFFSET				12
+#define CR0_FBM_MSB					0x0
+#define CR0_FBM_LSB					0x1
+
+#define CR0_BHT_OFFSET				13
+#define CR0_BHT_16BIT				0x0
+#define CR0_BHT_8BIT				0x1
+
+#define CR0_RSD_OFFSET				14
+#define CR0_RSD_MAX				0x3
+
+#define CR0_FRF_OFFSET				16
+#define CR0_FRF_SPI					0x0
+#define CR0_FRF_SSP					0x1
+#define CR0_FRF_MICROWIRE			0x2
+
+#define CR0_XFM_OFFSET				18
+#define CR0_XFM_MASK				(0x03 << SPI_XFM_OFFSET)
+#define CR0_XFM_TR					0x0
+#define CR0_XFM_TO					0x1
+#define CR0_XFM_RO					0x2
+
+#define CR0_OPM_OFFSET				20
+#define CR0_OPM_MASTER				0x0
+#define CR0_OPM_SLAVE				0x1
+
+#define CR0_SOI_OFFSET				23
+
+#define CR0_MTM_OFFSET				0x21
+
+/* Bit fields in SER, 2bit */
+#define SER_MASK					0x3
+
+/* Bit fields in BAUDR */
+#define BAUDR_SCKDV_MIN				2
+#define BAUDR_SCKDV_MAX				65534
+
+/* Bit fields in SR, 6bit */
+#define SR_MASK						0x3f
+#define SR_BUSY						(1 << 0)
+#define SR_TF_FULL					(1 << 1)
+#define SR_TF_EMPTY					(1 << 2)
+#define SR_RF_EMPTY					(1 << 3)
+#define SR_RF_FULL					(1 << 4)
+#define SR_SLAVE_TX_BUSY				(1 << 5)
+
+/* Bit fields in ISR, IMR, ISR, RISR, 5bit */
+#define INT_MASK					0x1f
+#define INT_TF_EMPTY				(1 << 0)
+#define INT_TF_OVERFLOW				(1 << 1)
+#define INT_RF_UNDERFLOW			(1 << 2)
+#define INT_RF_OVERFLOW				(1 << 3)
+#define INT_RF_FULL				(1 << 4)
+#define INT_CS_INACTIVE				(1 << 6)
+
+/* Bit fields in ICR, 4bit */
+#define ICR_MASK					0x0f
+#define ICR_ALL						(1 << 0)
+#define ICR_RF_UNDERFLOW			(1 << 1)
+#define ICR_RF_OVERFLOW				(1 << 2)
+#define ICR_TF_OVERFLOW				(1 << 3)
+
+/* Bit fields in DMACR */
+#define RF_DMA_EN					(1 << 0)
+#define TF_DMA_EN					(1 << 1)
+
+/* Driver state flags */
+#define RXDMA					(1 << 0)
+#define TXDMA					(1 << 1)
+
+/* sclk_out: spi master internal logic in rk3x can support 50Mhz */
+#define MAX_SCLK_OUT				50000000U
+
+/*
+ * SPI_CTRLR1 is 16-bits, so we should support lengths of 0xffff + 1. However,
+ * the controller seems to hang when given 0x10000, so stick with this for now.
+ */
+#define ROCKCHIP_SPI_MAX_TRANLEN		0xffff
+
+/* 2 for native cs, 2 for cs-gpio */
+#define ROCKCHIP_SPI_MAX_CS_NUM			4
+#define ROCKCHIP_SPI_VER2_TYPE1			0x05EC0002
+#define ROCKCHIP_SPI_VER2_TYPE2			0x00110002
+
+#define ROCKCHIP_AUTOSUSPEND_TIMEOUT		2000
+
+struct rockchip_spi {
+	struct device *dev;
+
+	struct clk *spiclk;
+	struct clk *apb_pclk;
+
+	void __iomem *regs;
+	dma_addr_t dma_addr_rx;
+	dma_addr_t dma_addr_tx;
+
+	const void *tx;
+	void *rx;
+	unsigned int tx_left;
+	unsigned int rx_left;
+
+	atomic_t state;
+
+	/*depth of the FIFO buffer */
+	u32 fifo_len;
+	/* frequency of spiclk */
+	u32 freq;
+
+	u8 n_bytes;
+	u8 rsd;
+
+	bool cs_asserted[ROCKCHIP_SPI_MAX_CS_NUM];
+
+	bool slave_abort;
+	bool cs_inactive; /* spi slave tansmition stop when cs inactive */
+	bool cs_high_supported; /* native CS supports active-high polarity */
+
+	struct spi_transfer *xfer; /* Store xfer temporarily */
+};
+
+static inline void spi_enable_chip(struct rockchip_spi *rs, bool enable)
+{
+	writel_relaxed((enable ? 1U : 0U), rs->regs + ROCKCHIP_SPI_SSIENR);
+}
+
+static inline void wait_for_tx_idle(struct rockchip_spi *rs, bool slave_mode)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(5);
+
+	do {
+		if (slave_mode) {
+			if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_SLAVE_TX_BUSY) &&
+			    !((readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY)))
+				return;
+		} else {
+			if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY))
+				return;
+		}
+	} while (!time_after(jiffies, timeout));
+
+	dev_warn(rs->dev, "spi controller is in busy state!\n");
+}
+
+static u32 get_fifo_len(struct rockchip_spi *rs)
+{
+	u32 ver;
+
+	ver = readl_relaxed(rs->regs + ROCKCHIP_SPI_VERSION);
+
+	switch (ver) {
+	case ROCKCHIP_SPI_VER2_TYPE1:
+	case ROCKCHIP_SPI_VER2_TYPE2:
+		return 64;
+	default:
+		return 32;
+	}
+}
+
+static void rockchip_spi_set_cs(struct spi_device *spi, bool enable)
+{
+	struct spi_controller *ctlr = spi->controller;
+	struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
+	bool cs_asserted = spi->mode & SPI_CS_HIGH ? enable : !enable;
+
+	/* Return immediately for no-op */
+	if (cs_asserted == rs->cs_asserted[spi->chip_select])
+		return;
+
+	if (cs_asserted) {
+		/* Keep things powered as long as CS is asserted */
+		pm_runtime_get_sync(rs->dev);
+
+		if (spi->cs_gpiod)
+			ROCKCHIP_SPI_SET_BITS(rs->regs + ROCKCHIP_SPI_SER, 1);
+		else
+			ROCKCHIP_SPI_SET_BITS(rs->regs + ROCKCHIP_SPI_SER, BIT(spi->chip_select));
+	} else {
+		if (spi->cs_gpiod)
+			ROCKCHIP_SPI_CLR_BITS(rs->regs + ROCKCHIP_SPI_SER, 1);
+		else
+			ROCKCHIP_SPI_CLR_BITS(rs->regs + ROCKCHIP_SPI_SER, BIT(spi->chip_select));
+
+		/* Drop reference from when we first asserted CS */
+		pm_runtime_put(rs->dev);
+	}
+
+	rs->cs_asserted[spi->chip_select] = cs_asserted;
+}
+
+static void rockchip_spi_handle_err(struct spi_controller *ctlr,
+				    struct spi_message *msg)
+{
+	struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
+
+	/* stop running spi transfer
+	 * this also flushes both rx and tx fifos
+	 */
+	spi_enable_chip(rs, false);
+
+	/* make sure all interrupts are masked and status cleared */
+	writel_relaxed(0, rs->regs + ROCKCHIP_SPI_IMR);
+	writel_relaxed(0xffffffff, rs->regs + ROCKCHIP_SPI_ICR);
+
+	if (atomic_read(&rs->state) & TXDMA)
+		dmaengine_terminate_async(ctlr->dma_tx);
+
+	if (atomic_read(&rs->state) & RXDMA)
+		dmaengine_terminate_async(ctlr->dma_rx);
+}
+
+static void rockchip_spi_pio_writer(struct rockchip_spi *rs)
+{
+	u32 tx_free = rs->fifo_len - readl_relaxed(rs->regs + ROCKCHIP_SPI_TXFLR);
+	u32 words = min(rs->tx_left, tx_free);
+
+	rs->tx_left -= words;
+	for (; words; words--) {
+		u32 txw;
+
+		if (rs->n_bytes == 1)
+			txw = *(u8 *)rs->tx;
+		else
+			txw = *(u16 *)rs->tx;
+
+		writel_relaxed(txw, rs->regs + ROCKCHIP_SPI_TXDR);
+		rs->tx += rs->n_bytes;
+	}
+}
+
+static void rockchip_spi_pio_reader(struct rockchip_spi *rs)
+{
+	u32 words = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR);
+	u32 rx_left = (rs->rx_left > words) ? rs->rx_left - words : 0;
+
+	/* the hardware doesn't allow us to change fifo threshold
+	 * level while spi is enabled, so instead make sure to leave
+	 * enough words in the rx fifo to get the last interrupt
+	 * exactly when all words have been received
+	 */
+	if (rx_left) {
+		u32 ftl = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFTLR) + 1;
+
+		if (rx_left < ftl) {
+			rx_left = ftl;
+			words = rs->rx_left - rx_left;
+		}
+	}
+
+	rs->rx_left = rx_left;
+	for (; words; words--) {
+		u32 rxw = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR);
+
+		if (!rs->rx)
+			continue;
+
+		if (rs->n_bytes == 1)
+			*(u8 *)rs->rx = (u8)rxw;
+		else
+			*(u16 *)rs->rx = (u16)rxw;
+		rs->rx += rs->n_bytes;
+	}
+}
+
+static irqreturn_t rockchip_spi_isr(int irq, void *dev_id)
+{
+	struct spi_controller *ctlr = dev_id;
+	struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
+
+	/* When int_cs_inactive comes, spi slave abort */
+	if (rs->cs_inactive && readl_relaxed(rs->regs + ROCKCHIP_SPI_IMR) & INT_CS_INACTIVE) {
+		ctlr->slave_abort(ctlr);
+		writel_relaxed(0, rs->regs + ROCKCHIP_SPI_IMR);
+		writel_relaxed(0xffffffff, rs->regs + ROCKCHIP_SPI_ICR);
+
+		return IRQ_HANDLED;
+	}
+
+	if (rs->tx_left)
+		rockchip_spi_pio_writer(rs);
+
+	rockchip_spi_pio_reader(rs);
+	if (!rs->rx_left) {
+		spi_enable_chip(rs, false);
+		writel_relaxed(0, rs->regs + ROCKCHIP_SPI_IMR);
+		writel_relaxed(0xffffffff, rs->regs + ROCKCHIP_SPI_ICR);
+		spi_finalize_current_transfer(ctlr);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int rockchip_spi_prepare_irq(struct rockchip_spi *rs,
+				    struct spi_controller *ctlr,
+				    struct spi_transfer *xfer)
+{
+	rs->tx = xfer->tx_buf;
+	rs->rx = xfer->rx_buf;
+	rs->tx_left = rs->tx ? xfer->len / rs->n_bytes : 0;
+	rs->rx_left = xfer->len / rs->n_bytes;
+
+	writel_relaxed(0xffffffff, rs->regs + ROCKCHIP_SPI_ICR);
+
+	spi_enable_chip(rs, true);
+
+	if (rs->tx_left)
+		rockchip_spi_pio_writer(rs);
+
+	if (rs->cs_inactive)
+		writel_relaxed(INT_RF_FULL | INT_CS_INACTIVE, rs->regs + ROCKCHIP_SPI_IMR);
+	else
+		writel_relaxed(INT_RF_FULL, rs->regs + ROCKCHIP_SPI_IMR);
+
+	/* 1 means the transfer is in progress */
+	return 1;
+}
+
+static void rockchip_spi_dma_rxcb(void *data)
+{
+	struct spi_controller *ctlr = data;
+	struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
+	int state = atomic_fetch_andnot(RXDMA, &rs->state);
+
+	if (state & TXDMA && !rs->slave_abort)
+		return;
+
+	if (rs->cs_inactive)
+		writel_relaxed(0, rs->regs + ROCKCHIP_SPI_IMR);
+
+	spi_enable_chip(rs, false);
+	spi_finalize_current_transfer(ctlr);
+}
+
+static void rockchip_spi_dma_txcb(void *data)
+{
+	struct spi_controller *ctlr = data;
+	struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
+	int state = atomic_fetch_andnot(TXDMA, &rs->state);
+
+	if (state & RXDMA && !rs->slave_abort)
+		return;
+
+	/* Wait until the FIFO data completely. */
+	wait_for_tx_idle(rs, ctlr->slave);
+
+	spi_enable_chip(rs, false);
+	spi_finalize_current_transfer(ctlr);
+}
+
+static u32 rockchip_spi_calc_burst_size(u32 data_len)
+{
+	u32 i;
+
+	/* burst size: 1, 2, 4, 8 */
+	for (i = 1; i < 8; i <<= 1) {
+		if (data_len & i)
+			break;
+	}
+
+	return i;
+}
+
+static int rockchip_spi_prepare_dma(struct rockchip_spi *rs,
+		struct spi_controller *ctlr, struct spi_transfer *xfer)
+{
+	struct dma_async_tx_descriptor *rxdesc, *txdesc;
+
+	atomic_set(&rs->state, 0);
+
+	rs->tx = xfer->tx_buf;
+	rs->rx = xfer->rx_buf;
+
+	rxdesc = NULL;
+	if (xfer->rx_buf) {
+		struct dma_slave_config rxconf = {
+			.direction = DMA_DEV_TO_MEM,
+			.src_addr = rs->dma_addr_rx,
+			.src_addr_width = rs->n_bytes,
+			.src_maxburst = rockchip_spi_calc_burst_size(xfer->len / rs->n_bytes),
+		};
+
+		dmaengine_slave_config(ctlr->dma_rx, &rxconf);
+
+		rxdesc = dmaengine_prep_slave_sg(
+				ctlr->dma_rx,
+				xfer->rx_sg.sgl, xfer->rx_sg.nents,
+				DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
+		if (!rxdesc)
+			return -EINVAL;
+
+		rxdesc->callback = rockchip_spi_dma_rxcb;
+		rxdesc->callback_param = ctlr;
+	}
+
+	txdesc = NULL;
+	if (xfer->tx_buf) {
+		struct dma_slave_config txconf = {
+			.direction = DMA_MEM_TO_DEV,
+			.dst_addr = rs->dma_addr_tx,
+			.dst_addr_width = rs->n_bytes,
+			.dst_maxburst = rs->fifo_len / 4,
+		};
+
+		dmaengine_slave_config(ctlr->dma_tx, &txconf);
+
+		txdesc = dmaengine_prep_slave_sg(
+				ctlr->dma_tx,
+				xfer->tx_sg.sgl, xfer->tx_sg.nents,
+				DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
+		if (!txdesc) {
+			if (rxdesc)
+				dmaengine_terminate_sync(ctlr->dma_rx);
+			return -EINVAL;
+		}
+
+		txdesc->callback = rockchip_spi_dma_txcb;
+		txdesc->callback_param = ctlr;
+	}
+
+	/* rx must be started before tx due to spi instinct */
+	if (rxdesc) {
+		atomic_or(RXDMA, &rs->state);
+		ctlr->dma_rx->cookie = dmaengine_submit(rxdesc);
+		dma_async_issue_pending(ctlr->dma_rx);
+	}
+
+	if (rs->cs_inactive)
+		writel_relaxed(INT_CS_INACTIVE, rs->regs + ROCKCHIP_SPI_IMR);
+
+	spi_enable_chip(rs, true);
+
+	if (txdesc) {
+		atomic_or(TXDMA, &rs->state);
+		dmaengine_submit(txdesc);
+		dma_async_issue_pending(ctlr->dma_tx);
+	}
+
+	/* 1 means the transfer is in progress */
+	return 1;
+}
+
+static int rockchip_spi_config(struct rockchip_spi *rs,
+		struct spi_device *spi, struct spi_transfer *xfer,
+		bool use_dma, bool slave_mode)
+{
+	u32 cr0 = CR0_FRF_SPI  << CR0_FRF_OFFSET
+		| CR0_BHT_8BIT << CR0_BHT_OFFSET
+		| CR0_SSD_ONE  << CR0_SSD_OFFSET
+		| CR0_EM_BIG   << CR0_EM_OFFSET;
+	u32 cr1;
+	u32 dmacr = 0;
+
+	if (slave_mode)
+		cr0 |= CR0_OPM_SLAVE << CR0_OPM_OFFSET;
+	rs->slave_abort = false;
+
+	cr0 |= rs->rsd << CR0_RSD_OFFSET;
+	cr0 |= (spi->mode & 0x3U) << CR0_SCPH_OFFSET;
+	if (spi->mode & SPI_LSB_FIRST)
+		cr0 |= CR0_FBM_LSB << CR0_FBM_OFFSET;
+	if (spi->mode & SPI_CS_HIGH)
+		cr0 |= BIT(spi->chip_select) << CR0_SOI_OFFSET;
+
+	if (xfer->rx_buf && xfer->tx_buf)
+		cr0 |= CR0_XFM_TR << CR0_XFM_OFFSET;
+	else if (xfer->rx_buf)
+		cr0 |= CR0_XFM_RO << CR0_XFM_OFFSET;
+	else if (use_dma)
+		cr0 |= CR0_XFM_TO << CR0_XFM_OFFSET;
+
+	switch (xfer->bits_per_word) {
+	case 4:
+		cr0 |= CR0_DFS_4BIT << CR0_DFS_OFFSET;
+		cr1 = xfer->len - 1;
+		break;
+	case 8:
+		cr0 |= CR0_DFS_8BIT << CR0_DFS_OFFSET;
+		cr1 = xfer->len - 1;
+		break;
+	case 16:
+		cr0 |= CR0_DFS_16BIT << CR0_DFS_OFFSET;
+		cr1 = xfer->len / 2 - 1;
+		break;
+	default:
+		/* we only whitelist 4, 8 and 16 bit words in
+		 * ctlr->bits_per_word_mask, so this shouldn't
+		 * happen
+		 */
+		dev_err(rs->dev, "unknown bits per word: %d\n",
+			xfer->bits_per_word);
+		return -EINVAL;
+	}
+
+	if (use_dma) {
+		if (xfer->tx_buf)
+			dmacr |= TF_DMA_EN;
+		if (xfer->rx_buf)
+			dmacr |= RF_DMA_EN;
+	}
+
+	writel_relaxed(cr0, rs->regs + ROCKCHIP_SPI_CTRLR0);
+	writel_relaxed(cr1, rs->regs + ROCKCHIP_SPI_CTRLR1);
+
+	/* unfortunately setting the fifo threshold level to generate an
+	 * interrupt exactly when the fifo is full doesn't seem to work,
+	 * so we need the strict inequality here
+	 */
+	if ((xfer->len / rs->n_bytes) < rs->fifo_len)
+		writel_relaxed(xfer->len / rs->n_bytes - 1, rs->regs + ROCKCHIP_SPI_RXFTLR);
+	else
+		writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_RXFTLR);
+
+	writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_DMATDLR);
+	writel_relaxed(rockchip_spi_calc_burst_size(xfer->len / rs->n_bytes) - 1,
+		       rs->regs + ROCKCHIP_SPI_DMARDLR);
+	writel_relaxed(dmacr, rs->regs + ROCKCHIP_SPI_DMACR);
+
+	/* the hardware only supports an even clock divisor, so
+	 * round divisor = spiclk / speed up to nearest even number
+	 * so that the resulting speed is <= the requested speed
+	 */
+	writel_relaxed(2 * DIV_ROUND_UP(rs->freq, 2 * xfer->speed_hz),
+			rs->regs + ROCKCHIP_SPI_BAUDR);
+
+	return 0;
+}
+
+static size_t rockchip_spi_max_transfer_size(struct spi_device *spi)
+{
+	return ROCKCHIP_SPI_MAX_TRANLEN;
+}
+
+static int rockchip_spi_slave_abort(struct spi_controller *ctlr)
+{
+	struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
+	u32 rx_fifo_left;
+	struct dma_tx_state state;
+	enum dma_status status;
+
+	/* Get current dma rx point */
+	if (atomic_read(&rs->state) & RXDMA) {
+		dmaengine_pause(ctlr->dma_rx);
+		status = dmaengine_tx_status(ctlr->dma_rx, ctlr->dma_rx->cookie, &state);
+		if (status == DMA_ERROR) {
+			rs->rx = rs->xfer->rx_buf;
+			rs->xfer->len = 0;
+			rx_fifo_left = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR);
+			for (; rx_fifo_left; rx_fifo_left--)
+				readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR);
+			goto out;
+		} else {
+			rs->rx += rs->xfer->len - rs->n_bytes * state.residue;
+		}
+	}
+
+	/* Get the valid data left in rx fifo and set rs->xfer->len real rx size */
+	if (rs->rx) {
+		rx_fifo_left = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR);
+		for (; rx_fifo_left; rx_fifo_left--) {
+			u32 rxw = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR);
+
+			if (rs->n_bytes == 1)
+				*(u8 *)rs->rx = (u8)rxw;
+			else
+				*(u16 *)rs->rx = (u16)rxw;
+			rs->rx += rs->n_bytes;
+		}
+		rs->xfer->len = (unsigned int)(rs->rx - rs->xfer->rx_buf);
+	}
+
+out:
+	if (atomic_read(&rs->state) & RXDMA)
+		dmaengine_terminate_sync(ctlr->dma_rx);
+	if (atomic_read(&rs->state) & TXDMA)
+		dmaengine_terminate_sync(ctlr->dma_tx);
+	atomic_set(&rs->state, 0);
+	spi_enable_chip(rs, false);
+	rs->slave_abort = true;
+	spi_finalize_current_transfer(ctlr);
+
+	return 0;
+}
+
+static int rockchip_spi_transfer_one(
+		struct spi_controller *ctlr,
+		struct spi_device *spi,
+		struct spi_transfer *xfer)
+{
+	struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
+	int ret;
+	bool use_dma;
+
+	/* Zero length transfers won't trigger an interrupt on completion */
+	if (!xfer->len) {
+		spi_finalize_current_transfer(ctlr);
+		return 1;
+	}
+
+	WARN_ON(readl_relaxed(rs->regs + ROCKCHIP_SPI_SSIENR) &&
+		(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY));
+
+	if (!xfer->tx_buf && !xfer->rx_buf) {
+		dev_err(rs->dev, "No buffer for transfer\n");
+		return -EINVAL;
+	}
+
+	if (xfer->len > ROCKCHIP_SPI_MAX_TRANLEN) {
+		dev_err(rs->dev, "Transfer is too long (%d)\n", xfer->len);
+		return -EINVAL;
+	}
+
+	rs->n_bytes = xfer->bits_per_word <= 8 ? 1 : 2;
+	rs->xfer = xfer;
+	use_dma = ctlr->can_dma ? ctlr->can_dma(ctlr, spi, xfer) : false;
+
+	ret = rockchip_spi_config(rs, spi, xfer, use_dma, ctlr->slave);
+	if (ret)
+		return ret;
+
+	if (use_dma)
+		return rockchip_spi_prepare_dma(rs, ctlr, xfer);
+
+	return rockchip_spi_prepare_irq(rs, ctlr, xfer);
+}
+
+static bool rockchip_spi_can_dma(struct spi_controller *ctlr,
+				 struct spi_device *spi,
+				 struct spi_transfer *xfer)
+{
+	struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
+	unsigned int bytes_per_word = xfer->bits_per_word <= 8 ? 1 : 2;
+
+	/* if the numbor of spi words to transfer is less than the fifo
+	 * length we can just fill the fifo and wait for a single irq,
+	 * so don't bother setting up dma
+	 */
+	return xfer->len / bytes_per_word >= rs->fifo_len;
+}
+
+static int rockchip_spi_setup(struct spi_device *spi)
+{
+	struct rockchip_spi *rs = spi_controller_get_devdata(spi->controller);
+	u32 cr0;
+
+	if (!spi->cs_gpiod && (spi->mode & SPI_CS_HIGH) && !rs->cs_high_supported) {
+		dev_warn(&spi->dev, "setup: non GPIO CS can't be active-high\n");
+		return -EINVAL;
+	}
+
+	pm_runtime_get_sync(rs->dev);
+
+	cr0 = readl_relaxed(rs->regs + ROCKCHIP_SPI_CTRLR0);
+
+	cr0 &= ~(0x3 << CR0_SCPH_OFFSET);
+	cr0 |= ((spi->mode & 0x3) << CR0_SCPH_OFFSET);
+	if (spi->mode & SPI_CS_HIGH && spi->chip_select <= 1)
+		cr0 |= BIT(spi->chip_select) << CR0_SOI_OFFSET;
+	else if (spi->chip_select <= 1)
+		cr0 &= ~(BIT(spi->chip_select) << CR0_SOI_OFFSET);
+
+	writel_relaxed(cr0, rs->regs + ROCKCHIP_SPI_CTRLR0);
+
+	pm_runtime_put(rs->dev);
+
+	return 0;
+}
+
+static int rockchip_spi_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct rockchip_spi *rs;
+	struct spi_controller *ctlr;
+	struct resource *mem;
+	struct device_node *np = pdev->dev.of_node;
+	u32 rsd_nsecs, num_cs;
+	bool slave_mode;
+
+	slave_mode = of_property_read_bool(np, "spi-slave");
+
+	if (slave_mode)
+		ctlr = spi_alloc_slave(&pdev->dev,
+				sizeof(struct rockchip_spi));
+	else
+		ctlr = spi_alloc_master(&pdev->dev,
+				sizeof(struct rockchip_spi));
+
+	if (!ctlr)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, ctlr);
+
+	rs = spi_controller_get_devdata(ctlr);
+	ctlr->slave = slave_mode;
+
+	/* Get basic io resource and map it */
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	rs->regs = devm_ioremap_resource(&pdev->dev, mem);
+	if (IS_ERR(rs->regs)) {
+		ret =  PTR_ERR(rs->regs);
+		goto err_put_ctlr;
+	}
+
+	rs->apb_pclk = devm_clk_get(&pdev->dev, "apb_pclk");
+	if (IS_ERR(rs->apb_pclk)) {
+		dev_err(&pdev->dev, "Failed to get apb_pclk\n");
+		ret = PTR_ERR(rs->apb_pclk);
+		goto err_put_ctlr;
+	}
+
+	rs->spiclk = devm_clk_get(&pdev->dev, "spiclk");
+	if (IS_ERR(rs->spiclk)) {
+		dev_err(&pdev->dev, "Failed to get spi_pclk\n");
+		ret = PTR_ERR(rs->spiclk);
+		goto err_put_ctlr;
+	}
+
+	ret = clk_prepare_enable(rs->apb_pclk);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to enable apb_pclk\n");
+		goto err_put_ctlr;
+	}
+
+	ret = clk_prepare_enable(rs->spiclk);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to enable spi_clk\n");
+		goto err_disable_apbclk;
+	}
+
+	spi_enable_chip(rs, false);
+
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		goto err_disable_spiclk;
+
+	ret = devm_request_threaded_irq(&pdev->dev, ret, rockchip_spi_isr, NULL,
+			IRQF_ONESHOT, dev_name(&pdev->dev), ctlr);
+	if (ret)
+		goto err_disable_spiclk;
+
+	rs->dev = &pdev->dev;
+	rs->freq = clk_get_rate(rs->spiclk);
+
+	if (!of_property_read_u32(pdev->dev.of_node, "rx-sample-delay-ns",
+				  &rsd_nsecs)) {
+		/* rx sample delay is expressed in parent clock cycles (max 3) */
+		u32 rsd = DIV_ROUND_CLOSEST(rsd_nsecs * (rs->freq >> 8),
+				1000000000 >> 8);
+		if (!rsd) {
+			dev_warn(rs->dev, "%u Hz are too slow to express %u ns delay\n",
+					rs->freq, rsd_nsecs);
+		} else if (rsd > CR0_RSD_MAX) {
+			rsd = CR0_RSD_MAX;
+			dev_warn(rs->dev, "%u Hz are too fast to express %u ns delay, clamping at %u ns\n",
+					rs->freq, rsd_nsecs,
+					CR0_RSD_MAX * 1000000000U / rs->freq);
+		}
+		rs->rsd = rsd;
+	}
+
+	rs->fifo_len = get_fifo_len(rs);
+	if (!rs->fifo_len) {
+		dev_err(&pdev->dev, "Failed to get fifo length\n");
+		ret = -EINVAL;
+		goto err_disable_spiclk;
+	}
+
+	pm_runtime_set_autosuspend_delay(&pdev->dev, ROCKCHIP_AUTOSUSPEND_TIMEOUT);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
+	ctlr->auto_runtime_pm = true;
+	ctlr->bus_num = pdev->id;
+	ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP | SPI_LSB_FIRST;
+	if (slave_mode) {
+		ctlr->mode_bits |= SPI_NO_CS;
+		ctlr->slave_abort = rockchip_spi_slave_abort;
+	} else {
+		ctlr->flags = SPI_MASTER_GPIO_SS;
+		ctlr->max_native_cs = ROCKCHIP_SPI_MAX_CS_NUM;
+		/*
+		 * rk spi0 has two native cs, spi1..5 one cs only
+		 * if num-cs is missing in the dts, default to 1
+		 */
+		if (of_property_read_u32(np, "num-cs", &num_cs))
+			num_cs = 1;
+		ctlr->num_chipselect = num_cs;
+		ctlr->use_gpio_descriptors = true;
+	}
+	ctlr->dev.of_node = pdev->dev.of_node;
+	ctlr->bits_per_word_mask = SPI_BPW_MASK(16) | SPI_BPW_MASK(8) | SPI_BPW_MASK(4);
+	ctlr->min_speed_hz = rs->freq / BAUDR_SCKDV_MAX;
+	ctlr->max_speed_hz = min(rs->freq / BAUDR_SCKDV_MIN, MAX_SCLK_OUT);
+
+	ctlr->setup = rockchip_spi_setup;
+	ctlr->set_cs = rockchip_spi_set_cs;
+	ctlr->transfer_one = rockchip_spi_transfer_one;
+	ctlr->max_transfer_size = rockchip_spi_max_transfer_size;
+	ctlr->handle_err = rockchip_spi_handle_err;
+
+	ctlr->dma_tx = dma_request_chan(rs->dev, "tx");
+	if (IS_ERR(ctlr->dma_tx)) {
+		/* Check tx to see if we need defer probing driver */
+		if (PTR_ERR(ctlr->dma_tx) == -EPROBE_DEFER) {
+			ret = -EPROBE_DEFER;
+			goto err_disable_pm_runtime;
+		}
+		dev_warn(rs->dev, "Failed to request TX DMA channel\n");
+		ctlr->dma_tx = NULL;
+	}
+
+	ctlr->dma_rx = dma_request_chan(rs->dev, "rx");
+	if (IS_ERR(ctlr->dma_rx)) {
+		if (PTR_ERR(ctlr->dma_rx) == -EPROBE_DEFER) {
+			ret = -EPROBE_DEFER;
+			goto err_free_dma_tx;
+		}
+		dev_warn(rs->dev, "Failed to request RX DMA channel\n");
+		ctlr->dma_rx = NULL;
+	}
+
+	if (ctlr->dma_tx && ctlr->dma_rx) {
+		rs->dma_addr_tx = mem->start + ROCKCHIP_SPI_TXDR;
+		rs->dma_addr_rx = mem->start + ROCKCHIP_SPI_RXDR;
+		ctlr->can_dma = rockchip_spi_can_dma;
+	}
+
+	switch (readl_relaxed(rs->regs + ROCKCHIP_SPI_VERSION)) {
+	case ROCKCHIP_SPI_VER2_TYPE2:
+		rs->cs_high_supported = true;
+		ctlr->mode_bits |= SPI_CS_HIGH;
+		if (ctlr->can_dma && slave_mode)
+			rs->cs_inactive = true;
+		else
+			rs->cs_inactive = false;
+		break;
+	default:
+		rs->cs_inactive = false;
+		break;
+	}
+
+	ret = devm_spi_register_controller(&pdev->dev, ctlr);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to register controller\n");
+		goto err_free_dma_rx;
+	}
+
+	return 0;
+
+err_free_dma_rx:
+	if (ctlr->dma_rx)
+		dma_release_channel(ctlr->dma_rx);
+err_free_dma_tx:
+	if (ctlr->dma_tx)
+		dma_release_channel(ctlr->dma_tx);
+err_disable_pm_runtime:
+	pm_runtime_disable(&pdev->dev);
+err_disable_spiclk:
+	clk_disable_unprepare(rs->spiclk);
+err_disable_apbclk:
+	clk_disable_unprepare(rs->apb_pclk);
+err_put_ctlr:
+	spi_controller_put(ctlr);
+
+	return ret;
+}
+
+static int rockchip_spi_remove(struct platform_device *pdev)
+{
+	struct spi_controller *ctlr = spi_controller_get(platform_get_drvdata(pdev));
+	struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
+
+	pm_runtime_get_sync(&pdev->dev);
+
+	clk_disable_unprepare(rs->spiclk);
+	clk_disable_unprepare(rs->apb_pclk);
+
+	pm_runtime_put_noidle(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+	pm_runtime_set_suspended(&pdev->dev);
+
+	if (ctlr->dma_tx)
+		dma_release_channel(ctlr->dma_tx);
+	if (ctlr->dma_rx)
+		dma_release_channel(ctlr->dma_rx);
+
+	spi_controller_put(ctlr);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int rockchip_spi_suspend(struct device *dev)
+{
+	int ret;
+	struct spi_controller *ctlr = dev_get_drvdata(dev);
+	struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
+
+	ret = spi_controller_suspend(ctlr);
+	if (ret < 0)
+		return ret;
+
+	clk_disable_unprepare(rs->spiclk);
+	clk_disable_unprepare(rs->apb_pclk);
+
+	pinctrl_pm_select_sleep_state(dev);
+
+	return 0;
+}
+
+static int rockchip_spi_resume(struct device *dev)
+{
+	int ret;
+	struct spi_controller *ctlr = dev_get_drvdata(dev);
+	struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
+
+	pinctrl_pm_select_default_state(dev);
+
+	ret = clk_prepare_enable(rs->apb_pclk);
+	if (ret < 0)
+		return ret;
+
+	ret = clk_prepare_enable(rs->spiclk);
+	if (ret < 0)
+		clk_disable_unprepare(rs->apb_pclk);
+
+	ret = spi_controller_resume(ctlr);
+	if (ret < 0) {
+		clk_disable_unprepare(rs->spiclk);
+		clk_disable_unprepare(rs->apb_pclk);
+	}
+
+	return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM
+static int rockchip_spi_runtime_suspend(struct device *dev)
+{
+	struct spi_controller *ctlr = dev_get_drvdata(dev);
+	struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
+
+	clk_disable_unprepare(rs->spiclk);
+	clk_disable_unprepare(rs->apb_pclk);
+
+	return 0;
+}
+
+static int rockchip_spi_runtime_resume(struct device *dev)
+{
+	int ret;
+	struct spi_controller *ctlr = dev_get_drvdata(dev);
+	struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
+
+	ret = clk_prepare_enable(rs->apb_pclk);
+	if (ret < 0)
+		return ret;
+
+	ret = clk_prepare_enable(rs->spiclk);
+	if (ret < 0)
+		clk_disable_unprepare(rs->apb_pclk);
+
+	return 0;
+}
+#endif /* CONFIG_PM */
+
+static const struct dev_pm_ops rockchip_spi_pm = {
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(rockchip_spi_suspend, rockchip_spi_resume)
+	SET_RUNTIME_PM_OPS(rockchip_spi_runtime_suspend,
+			   rockchip_spi_runtime_resume, NULL)
+};
+
+static const struct of_device_id rockchip_spi_dt_match[] = {
+	{ .compatible = "rockchip,px30-spi", },
+	{ .compatible = "rockchip,rk3036-spi", },
+	{ .compatible = "rockchip,rk3066-spi", },
+	{ .compatible = "rockchip,rk3188-spi", },
+	{ .compatible = "rockchip,rk3228-spi", },
+	{ .compatible = "rockchip,rk3288-spi", },
+	{ .compatible = "rockchip,rk3308-spi", },
+	{ .compatible = "rockchip,rk3328-spi", },
+	{ .compatible = "rockchip,rk3368-spi", },
+	{ .compatible = "rockchip,rk3399-spi", },
+	{ .compatible = "rockchip,rv1108-spi", },
+	{ .compatible = "rockchip,rv1126-spi", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, rockchip_spi_dt_match);
+
+static struct platform_driver rockchip_spi_driver = {
+	.driver = {
+		.name	= DRIVER_NAME,
+		.pm = &rockchip_spi_pm,
+		.of_match_table = of_match_ptr(rockchip_spi_dt_match),
+	},
+	.probe = rockchip_spi_probe,
+	.remove = rockchip_spi_remove,
+};
+
+module_platform_driver(rockchip_spi_driver);
+
+MODULE_AUTHOR("Addy Ke <addy.ke@rock-chips.com>");
+MODULE_DESCRIPTION("ROCKCHIP SPI Controller Driver");
+MODULE_LICENSE("GPL v2");