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-rw-r--r--drivers/spi/spi-tegra114.c1540
1 files changed, 1540 insertions, 0 deletions
diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c
new file mode 100644
index 000000000..ed42665b1
--- /dev/null
+++ b/drivers/spi/spi-tegra114.c
@@ -0,0 +1,1540 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SPI driver for NVIDIA's Tegra114 SPI Controller.
+ *
+ * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
+ */
+
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/reset.h>
+#include <linux/spi/spi.h>
+
+#define SPI_COMMAND1 0x000
+#define SPI_BIT_LENGTH(x) (((x) & 0x1f) << 0)
+#define SPI_PACKED (1 << 5)
+#define SPI_TX_EN (1 << 11)
+#define SPI_RX_EN (1 << 12)
+#define SPI_BOTH_EN_BYTE (1 << 13)
+#define SPI_BOTH_EN_BIT (1 << 14)
+#define SPI_LSBYTE_FE (1 << 15)
+#define SPI_LSBIT_FE (1 << 16)
+#define SPI_BIDIROE (1 << 17)
+#define SPI_IDLE_SDA_DRIVE_LOW (0 << 18)
+#define SPI_IDLE_SDA_DRIVE_HIGH (1 << 18)
+#define SPI_IDLE_SDA_PULL_LOW (2 << 18)
+#define SPI_IDLE_SDA_PULL_HIGH (3 << 18)
+#define SPI_IDLE_SDA_MASK (3 << 18)
+#define SPI_CS_SW_VAL (1 << 20)
+#define SPI_CS_SW_HW (1 << 21)
+/* SPI_CS_POL_INACTIVE bits are default high */
+ /* n from 0 to 3 */
+#define SPI_CS_POL_INACTIVE(n) (1 << (22 + (n)))
+#define SPI_CS_POL_INACTIVE_MASK (0xF << 22)
+
+#define SPI_CS_SEL_0 (0 << 26)
+#define SPI_CS_SEL_1 (1 << 26)
+#define SPI_CS_SEL_2 (2 << 26)
+#define SPI_CS_SEL_3 (3 << 26)
+#define SPI_CS_SEL_MASK (3 << 26)
+#define SPI_CS_SEL(x) (((x) & 0x3) << 26)
+#define SPI_CONTROL_MODE_0 (0 << 28)
+#define SPI_CONTROL_MODE_1 (1 << 28)
+#define SPI_CONTROL_MODE_2 (2 << 28)
+#define SPI_CONTROL_MODE_3 (3 << 28)
+#define SPI_CONTROL_MODE_MASK (3 << 28)
+#define SPI_MODE_SEL(x) (((x) & 0x3) << 28)
+#define SPI_M_S (1 << 30)
+#define SPI_PIO (1 << 31)
+
+#define SPI_COMMAND2 0x004
+#define SPI_TX_TAP_DELAY(x) (((x) & 0x3F) << 6)
+#define SPI_RX_TAP_DELAY(x) (((x) & 0x3F) << 0)
+
+#define SPI_CS_TIMING1 0x008
+#define SPI_SETUP_HOLD(setup, hold) (((setup) << 4) | (hold))
+#define SPI_CS_SETUP_HOLD(reg, cs, val) \
+ ((((val) & 0xFFu) << ((cs) * 8)) | \
+ ((reg) & ~(0xFFu << ((cs) * 8))))
+
+#define SPI_CS_TIMING2 0x00C
+#define CYCLES_BETWEEN_PACKETS_0(x) (((x) & 0x1F) << 0)
+#define CS_ACTIVE_BETWEEN_PACKETS_0 (1 << 5)
+#define CYCLES_BETWEEN_PACKETS_1(x) (((x) & 0x1F) << 8)
+#define CS_ACTIVE_BETWEEN_PACKETS_1 (1 << 13)
+#define CYCLES_BETWEEN_PACKETS_2(x) (((x) & 0x1F) << 16)
+#define CS_ACTIVE_BETWEEN_PACKETS_2 (1 << 21)
+#define CYCLES_BETWEEN_PACKETS_3(x) (((x) & 0x1F) << 24)
+#define CS_ACTIVE_BETWEEN_PACKETS_3 (1 << 29)
+#define SPI_SET_CS_ACTIVE_BETWEEN_PACKETS(reg, cs, val) \
+ (reg = (((val) & 0x1) << ((cs) * 8 + 5)) | \
+ ((reg) & ~(1 << ((cs) * 8 + 5))))
+#define SPI_SET_CYCLES_BETWEEN_PACKETS(reg, cs, val) \
+ (reg = (((val) & 0x1F) << ((cs) * 8)) | \
+ ((reg) & ~(0x1F << ((cs) * 8))))
+#define MAX_SETUP_HOLD_CYCLES 16
+#define MAX_INACTIVE_CYCLES 32
+
+#define SPI_TRANS_STATUS 0x010
+#define SPI_BLK_CNT(val) (((val) >> 0) & 0xFFFF)
+#define SPI_SLV_IDLE_COUNT(val) (((val) >> 16) & 0xFF)
+#define SPI_RDY (1 << 30)
+
+#define SPI_FIFO_STATUS 0x014
+#define SPI_RX_FIFO_EMPTY (1 << 0)
+#define SPI_RX_FIFO_FULL (1 << 1)
+#define SPI_TX_FIFO_EMPTY (1 << 2)
+#define SPI_TX_FIFO_FULL (1 << 3)
+#define SPI_RX_FIFO_UNF (1 << 4)
+#define SPI_RX_FIFO_OVF (1 << 5)
+#define SPI_TX_FIFO_UNF (1 << 6)
+#define SPI_TX_FIFO_OVF (1 << 7)
+#define SPI_ERR (1 << 8)
+#define SPI_TX_FIFO_FLUSH (1 << 14)
+#define SPI_RX_FIFO_FLUSH (1 << 15)
+#define SPI_TX_FIFO_EMPTY_COUNT(val) (((val) >> 16) & 0x7F)
+#define SPI_RX_FIFO_FULL_COUNT(val) (((val) >> 23) & 0x7F)
+#define SPI_FRAME_END (1 << 30)
+#define SPI_CS_INACTIVE (1 << 31)
+
+#define SPI_FIFO_ERROR (SPI_RX_FIFO_UNF | \
+ SPI_RX_FIFO_OVF | SPI_TX_FIFO_UNF | SPI_TX_FIFO_OVF)
+#define SPI_FIFO_EMPTY (SPI_RX_FIFO_EMPTY | SPI_TX_FIFO_EMPTY)
+
+#define SPI_TX_DATA 0x018
+#define SPI_RX_DATA 0x01C
+
+#define SPI_DMA_CTL 0x020
+#define SPI_TX_TRIG_1 (0 << 15)
+#define SPI_TX_TRIG_4 (1 << 15)
+#define SPI_TX_TRIG_8 (2 << 15)
+#define SPI_TX_TRIG_16 (3 << 15)
+#define SPI_TX_TRIG_MASK (3 << 15)
+#define SPI_RX_TRIG_1 (0 << 19)
+#define SPI_RX_TRIG_4 (1 << 19)
+#define SPI_RX_TRIG_8 (2 << 19)
+#define SPI_RX_TRIG_16 (3 << 19)
+#define SPI_RX_TRIG_MASK (3 << 19)
+#define SPI_IE_TX (1 << 28)
+#define SPI_IE_RX (1 << 29)
+#define SPI_CONT (1 << 30)
+#define SPI_DMA (1 << 31)
+#define SPI_DMA_EN SPI_DMA
+
+#define SPI_DMA_BLK 0x024
+#define SPI_DMA_BLK_SET(x) (((x) & 0xFFFF) << 0)
+
+#define SPI_TX_FIFO 0x108
+#define SPI_RX_FIFO 0x188
+#define SPI_INTR_MASK 0x18c
+#define SPI_INTR_ALL_MASK (0x1fUL << 25)
+#define MAX_CHIP_SELECT 4
+#define SPI_FIFO_DEPTH 64
+#define DATA_DIR_TX (1 << 0)
+#define DATA_DIR_RX (1 << 1)
+
+#define SPI_DMA_TIMEOUT (msecs_to_jiffies(1000))
+#define DEFAULT_SPI_DMA_BUF_LEN (16*1024)
+#define TX_FIFO_EMPTY_COUNT_MAX SPI_TX_FIFO_EMPTY_COUNT(0x40)
+#define RX_FIFO_FULL_COUNT_ZERO SPI_RX_FIFO_FULL_COUNT(0)
+#define MAX_HOLD_CYCLES 16
+#define SPI_DEFAULT_SPEED 25000000
+
+struct tegra_spi_soc_data {
+ bool has_intr_mask_reg;
+};
+
+struct tegra_spi_client_data {
+ int tx_clk_tap_delay;
+ int rx_clk_tap_delay;
+};
+
+struct tegra_spi_data {
+ struct device *dev;
+ struct spi_master *master;
+ spinlock_t lock;
+
+ struct clk *clk;
+ struct reset_control *rst;
+ void __iomem *base;
+ phys_addr_t phys;
+ unsigned irq;
+ u32 cur_speed;
+
+ struct spi_device *cur_spi;
+ struct spi_device *cs_control;
+ unsigned cur_pos;
+ unsigned words_per_32bit;
+ unsigned bytes_per_word;
+ unsigned curr_dma_words;
+ unsigned cur_direction;
+
+ unsigned cur_rx_pos;
+ unsigned cur_tx_pos;
+
+ unsigned dma_buf_size;
+ unsigned max_buf_size;
+ bool is_curr_dma_xfer;
+ bool use_hw_based_cs;
+
+ struct completion rx_dma_complete;
+ struct completion tx_dma_complete;
+
+ u32 tx_status;
+ u32 rx_status;
+ u32 status_reg;
+ bool is_packed;
+
+ u32 command1_reg;
+ u32 dma_control_reg;
+ u32 def_command1_reg;
+ u32 def_command2_reg;
+ u32 spi_cs_timing1;
+ u32 spi_cs_timing2;
+ u8 last_used_cs;
+
+ struct completion xfer_completion;
+ struct spi_transfer *curr_xfer;
+ struct dma_chan *rx_dma_chan;
+ u32 *rx_dma_buf;
+ dma_addr_t rx_dma_phys;
+ struct dma_async_tx_descriptor *rx_dma_desc;
+
+ struct dma_chan *tx_dma_chan;
+ u32 *tx_dma_buf;
+ dma_addr_t tx_dma_phys;
+ struct dma_async_tx_descriptor *tx_dma_desc;
+ const struct tegra_spi_soc_data *soc_data;
+};
+
+static int tegra_spi_runtime_suspend(struct device *dev);
+static int tegra_spi_runtime_resume(struct device *dev);
+
+static inline u32 tegra_spi_readl(struct tegra_spi_data *tspi,
+ unsigned long reg)
+{
+ return readl(tspi->base + reg);
+}
+
+static inline void tegra_spi_writel(struct tegra_spi_data *tspi,
+ u32 val, unsigned long reg)
+{
+ writel(val, tspi->base + reg);
+
+ /* Read back register to make sure that register writes completed */
+ if (reg != SPI_TX_FIFO)
+ readl(tspi->base + SPI_COMMAND1);
+}
+
+static void tegra_spi_clear_status(struct tegra_spi_data *tspi)
+{
+ u32 val;
+
+ /* Write 1 to clear status register */
+ val = tegra_spi_readl(tspi, SPI_TRANS_STATUS);
+ tegra_spi_writel(tspi, val, SPI_TRANS_STATUS);
+
+ /* Clear fifo status error if any */
+ val = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
+ if (val & SPI_ERR)
+ tegra_spi_writel(tspi, SPI_ERR | SPI_FIFO_ERROR,
+ SPI_FIFO_STATUS);
+}
+
+static unsigned tegra_spi_calculate_curr_xfer_param(
+ struct spi_device *spi, struct tegra_spi_data *tspi,
+ struct spi_transfer *t)
+{
+ unsigned remain_len = t->len - tspi->cur_pos;
+ unsigned max_word;
+ unsigned bits_per_word = t->bits_per_word;
+ unsigned max_len;
+ unsigned total_fifo_words;
+
+ tspi->bytes_per_word = DIV_ROUND_UP(bits_per_word, 8);
+
+ if ((bits_per_word == 8 || bits_per_word == 16 ||
+ bits_per_word == 32) && t->len > 3) {
+ tspi->is_packed = true;
+ tspi->words_per_32bit = 32/bits_per_word;
+ } else {
+ tspi->is_packed = false;
+ tspi->words_per_32bit = 1;
+ }
+
+ if (tspi->is_packed) {
+ max_len = min(remain_len, tspi->max_buf_size);
+ tspi->curr_dma_words = max_len/tspi->bytes_per_word;
+ total_fifo_words = (max_len + 3) / 4;
+ } else {
+ max_word = (remain_len - 1) / tspi->bytes_per_word + 1;
+ max_word = min(max_word, tspi->max_buf_size/4);
+ tspi->curr_dma_words = max_word;
+ total_fifo_words = max_word;
+ }
+ return total_fifo_words;
+}
+
+static unsigned tegra_spi_fill_tx_fifo_from_client_txbuf(
+ struct tegra_spi_data *tspi, struct spi_transfer *t)
+{
+ unsigned nbytes;
+ unsigned tx_empty_count;
+ u32 fifo_status;
+ unsigned max_n_32bit;
+ unsigned i, count;
+ unsigned int written_words;
+ unsigned fifo_words_left;
+ u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos;
+
+ fifo_status = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
+ tx_empty_count = SPI_TX_FIFO_EMPTY_COUNT(fifo_status);
+
+ if (tspi->is_packed) {
+ fifo_words_left = tx_empty_count * tspi->words_per_32bit;
+ written_words = min(fifo_words_left, tspi->curr_dma_words);
+ nbytes = written_words * tspi->bytes_per_word;
+ max_n_32bit = DIV_ROUND_UP(nbytes, 4);
+ for (count = 0; count < max_n_32bit; count++) {
+ u32 x = 0;
+
+ for (i = 0; (i < 4) && nbytes; i++, nbytes--)
+ x |= (u32)(*tx_buf++) << (i * 8);
+ tegra_spi_writel(tspi, x, SPI_TX_FIFO);
+ }
+
+ tspi->cur_tx_pos += written_words * tspi->bytes_per_word;
+ } else {
+ unsigned int write_bytes;
+ max_n_32bit = min(tspi->curr_dma_words, tx_empty_count);
+ written_words = max_n_32bit;
+ nbytes = written_words * tspi->bytes_per_word;
+ if (nbytes > t->len - tspi->cur_pos)
+ nbytes = t->len - tspi->cur_pos;
+ write_bytes = nbytes;
+ for (count = 0; count < max_n_32bit; count++) {
+ u32 x = 0;
+
+ for (i = 0; nbytes && (i < tspi->bytes_per_word);
+ i++, nbytes--)
+ x |= (u32)(*tx_buf++) << (i * 8);
+ tegra_spi_writel(tspi, x, SPI_TX_FIFO);
+ }
+
+ tspi->cur_tx_pos += write_bytes;
+ }
+
+ return written_words;
+}
+
+static unsigned int tegra_spi_read_rx_fifo_to_client_rxbuf(
+ struct tegra_spi_data *tspi, struct spi_transfer *t)
+{
+ unsigned rx_full_count;
+ u32 fifo_status;
+ unsigned i, count;
+ unsigned int read_words = 0;
+ unsigned len;
+ u8 *rx_buf = (u8 *)t->rx_buf + tspi->cur_rx_pos;
+
+ fifo_status = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
+ rx_full_count = SPI_RX_FIFO_FULL_COUNT(fifo_status);
+ if (tspi->is_packed) {
+ len = tspi->curr_dma_words * tspi->bytes_per_word;
+ for (count = 0; count < rx_full_count; count++) {
+ u32 x = tegra_spi_readl(tspi, SPI_RX_FIFO);
+
+ for (i = 0; len && (i < 4); i++, len--)
+ *rx_buf++ = (x >> i*8) & 0xFF;
+ }
+ read_words += tspi->curr_dma_words;
+ tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word;
+ } else {
+ u32 rx_mask = ((u32)1 << t->bits_per_word) - 1;
+ u8 bytes_per_word = tspi->bytes_per_word;
+ unsigned int read_bytes;
+
+ len = rx_full_count * bytes_per_word;
+ if (len > t->len - tspi->cur_pos)
+ len = t->len - tspi->cur_pos;
+ read_bytes = len;
+ for (count = 0; count < rx_full_count; count++) {
+ u32 x = tegra_spi_readl(tspi, SPI_RX_FIFO) & rx_mask;
+
+ for (i = 0; len && (i < bytes_per_word); i++, len--)
+ *rx_buf++ = (x >> (i*8)) & 0xFF;
+ }
+ read_words += rx_full_count;
+ tspi->cur_rx_pos += read_bytes;
+ }
+
+ return read_words;
+}
+
+static void tegra_spi_copy_client_txbuf_to_spi_txbuf(
+ struct tegra_spi_data *tspi, struct spi_transfer *t)
+{
+ /* Make the dma buffer to read by cpu */
+ dma_sync_single_for_cpu(tspi->dev, tspi->tx_dma_phys,
+ tspi->dma_buf_size, DMA_TO_DEVICE);
+
+ if (tspi->is_packed) {
+ unsigned len = tspi->curr_dma_words * tspi->bytes_per_word;
+
+ memcpy(tspi->tx_dma_buf, t->tx_buf + tspi->cur_pos, len);
+ tspi->cur_tx_pos += tspi->curr_dma_words * tspi->bytes_per_word;
+ } else {
+ unsigned int i;
+ unsigned int count;
+ u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos;
+ unsigned consume = tspi->curr_dma_words * tspi->bytes_per_word;
+ unsigned int write_bytes;
+
+ if (consume > t->len - tspi->cur_pos)
+ consume = t->len - tspi->cur_pos;
+ write_bytes = consume;
+ for (count = 0; count < tspi->curr_dma_words; count++) {
+ u32 x = 0;
+
+ for (i = 0; consume && (i < tspi->bytes_per_word);
+ i++, consume--)
+ x |= (u32)(*tx_buf++) << (i * 8);
+ tspi->tx_dma_buf[count] = x;
+ }
+
+ tspi->cur_tx_pos += write_bytes;
+ }
+
+ /* Make the dma buffer to read by dma */
+ dma_sync_single_for_device(tspi->dev, tspi->tx_dma_phys,
+ tspi->dma_buf_size, DMA_TO_DEVICE);
+}
+
+static void tegra_spi_copy_spi_rxbuf_to_client_rxbuf(
+ struct tegra_spi_data *tspi, struct spi_transfer *t)
+{
+ /* Make the dma buffer to read by cpu */
+ dma_sync_single_for_cpu(tspi->dev, tspi->rx_dma_phys,
+ tspi->dma_buf_size, DMA_FROM_DEVICE);
+
+ if (tspi->is_packed) {
+ unsigned len = tspi->curr_dma_words * tspi->bytes_per_word;
+
+ memcpy(t->rx_buf + tspi->cur_rx_pos, tspi->rx_dma_buf, len);
+ tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word;
+ } else {
+ unsigned int i;
+ unsigned int count;
+ unsigned char *rx_buf = t->rx_buf + tspi->cur_rx_pos;
+ u32 rx_mask = ((u32)1 << t->bits_per_word) - 1;
+ unsigned consume = tspi->curr_dma_words * tspi->bytes_per_word;
+ unsigned int read_bytes;
+
+ if (consume > t->len - tspi->cur_pos)
+ consume = t->len - tspi->cur_pos;
+ read_bytes = consume;
+ for (count = 0; count < tspi->curr_dma_words; count++) {
+ u32 x = tspi->rx_dma_buf[count] & rx_mask;
+
+ for (i = 0; consume && (i < tspi->bytes_per_word);
+ i++, consume--)
+ *rx_buf++ = (x >> (i*8)) & 0xFF;
+ }
+
+ tspi->cur_rx_pos += read_bytes;
+ }
+
+ /* Make the dma buffer to read by dma */
+ dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys,
+ tspi->dma_buf_size, DMA_FROM_DEVICE);
+}
+
+static void tegra_spi_dma_complete(void *args)
+{
+ struct completion *dma_complete = args;
+
+ complete(dma_complete);
+}
+
+static int tegra_spi_start_tx_dma(struct tegra_spi_data *tspi, int len)
+{
+ reinit_completion(&tspi->tx_dma_complete);
+ tspi->tx_dma_desc = dmaengine_prep_slave_single(tspi->tx_dma_chan,
+ tspi->tx_dma_phys, len, DMA_MEM_TO_DEV,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!tspi->tx_dma_desc) {
+ dev_err(tspi->dev, "Not able to get desc for Tx\n");
+ return -EIO;
+ }
+
+ tspi->tx_dma_desc->callback = tegra_spi_dma_complete;
+ tspi->tx_dma_desc->callback_param = &tspi->tx_dma_complete;
+
+ dmaengine_submit(tspi->tx_dma_desc);
+ dma_async_issue_pending(tspi->tx_dma_chan);
+ return 0;
+}
+
+static int tegra_spi_start_rx_dma(struct tegra_spi_data *tspi, int len)
+{
+ reinit_completion(&tspi->rx_dma_complete);
+ tspi->rx_dma_desc = dmaengine_prep_slave_single(tspi->rx_dma_chan,
+ tspi->rx_dma_phys, len, DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!tspi->rx_dma_desc) {
+ dev_err(tspi->dev, "Not able to get desc for Rx\n");
+ return -EIO;
+ }
+
+ tspi->rx_dma_desc->callback = tegra_spi_dma_complete;
+ tspi->rx_dma_desc->callback_param = &tspi->rx_dma_complete;
+
+ dmaengine_submit(tspi->rx_dma_desc);
+ dma_async_issue_pending(tspi->rx_dma_chan);
+ return 0;
+}
+
+static int tegra_spi_flush_fifos(struct tegra_spi_data *tspi)
+{
+ unsigned long timeout = jiffies + HZ;
+ u32 status;
+
+ status = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
+ if ((status & SPI_FIFO_EMPTY) != SPI_FIFO_EMPTY) {
+ status |= SPI_RX_FIFO_FLUSH | SPI_TX_FIFO_FLUSH;
+ tegra_spi_writel(tspi, status, SPI_FIFO_STATUS);
+ while ((status & SPI_FIFO_EMPTY) != SPI_FIFO_EMPTY) {
+ status = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
+ if (time_after(jiffies, timeout)) {
+ dev_err(tspi->dev,
+ "timeout waiting for fifo flush\n");
+ return -EIO;
+ }
+
+ udelay(1);
+ }
+ }
+
+ return 0;
+}
+
+static int tegra_spi_start_dma_based_transfer(
+ struct tegra_spi_data *tspi, struct spi_transfer *t)
+{
+ u32 val;
+ unsigned int len;
+ int ret = 0;
+ u8 dma_burst;
+ struct dma_slave_config dma_sconfig = {0};
+
+ val = SPI_DMA_BLK_SET(tspi->curr_dma_words - 1);
+ tegra_spi_writel(tspi, val, SPI_DMA_BLK);
+
+ if (tspi->is_packed)
+ len = DIV_ROUND_UP(tspi->curr_dma_words * tspi->bytes_per_word,
+ 4) * 4;
+ else
+ len = tspi->curr_dma_words * 4;
+
+ /* Set attention level based on length of transfer */
+ if (len & 0xF) {
+ val |= SPI_TX_TRIG_1 | SPI_RX_TRIG_1;
+ dma_burst = 1;
+ } else if (((len) >> 4) & 0x1) {
+ val |= SPI_TX_TRIG_4 | SPI_RX_TRIG_4;
+ dma_burst = 4;
+ } else {
+ val |= SPI_TX_TRIG_8 | SPI_RX_TRIG_8;
+ dma_burst = 8;
+ }
+
+ if (!tspi->soc_data->has_intr_mask_reg) {
+ if (tspi->cur_direction & DATA_DIR_TX)
+ val |= SPI_IE_TX;
+
+ if (tspi->cur_direction & DATA_DIR_RX)
+ val |= SPI_IE_RX;
+ }
+
+ tegra_spi_writel(tspi, val, SPI_DMA_CTL);
+ tspi->dma_control_reg = val;
+
+ dma_sconfig.device_fc = true;
+ if (tspi->cur_direction & DATA_DIR_TX) {
+ dma_sconfig.dst_addr = tspi->phys + SPI_TX_FIFO;
+ dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ dma_sconfig.dst_maxburst = dma_burst;
+ ret = dmaengine_slave_config(tspi->tx_dma_chan, &dma_sconfig);
+ if (ret < 0) {
+ dev_err(tspi->dev,
+ "DMA slave config failed: %d\n", ret);
+ return ret;
+ }
+
+ tegra_spi_copy_client_txbuf_to_spi_txbuf(tspi, t);
+ ret = tegra_spi_start_tx_dma(tspi, len);
+ if (ret < 0) {
+ dev_err(tspi->dev,
+ "Starting tx dma failed, err %d\n", ret);
+ return ret;
+ }
+ }
+
+ if (tspi->cur_direction & DATA_DIR_RX) {
+ dma_sconfig.src_addr = tspi->phys + SPI_RX_FIFO;
+ dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ dma_sconfig.src_maxburst = dma_burst;
+ ret = dmaengine_slave_config(tspi->rx_dma_chan, &dma_sconfig);
+ if (ret < 0) {
+ dev_err(tspi->dev,
+ "DMA slave config failed: %d\n", ret);
+ return ret;
+ }
+
+ /* Make the dma buffer to read by dma */
+ dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys,
+ tspi->dma_buf_size, DMA_FROM_DEVICE);
+
+ ret = tegra_spi_start_rx_dma(tspi, len);
+ if (ret < 0) {
+ dev_err(tspi->dev,
+ "Starting rx dma failed, err %d\n", ret);
+ if (tspi->cur_direction & DATA_DIR_TX)
+ dmaengine_terminate_all(tspi->tx_dma_chan);
+ return ret;
+ }
+ }
+ tspi->is_curr_dma_xfer = true;
+ tspi->dma_control_reg = val;
+
+ val |= SPI_DMA_EN;
+ tegra_spi_writel(tspi, val, SPI_DMA_CTL);
+ return ret;
+}
+
+static int tegra_spi_start_cpu_based_transfer(
+ struct tegra_spi_data *tspi, struct spi_transfer *t)
+{
+ u32 val;
+ unsigned cur_words;
+
+ if (tspi->cur_direction & DATA_DIR_TX)
+ cur_words = tegra_spi_fill_tx_fifo_from_client_txbuf(tspi, t);
+ else
+ cur_words = tspi->curr_dma_words;
+
+ val = SPI_DMA_BLK_SET(cur_words - 1);
+ tegra_spi_writel(tspi, val, SPI_DMA_BLK);
+
+ val = 0;
+ if (tspi->cur_direction & DATA_DIR_TX)
+ val |= SPI_IE_TX;
+
+ if (tspi->cur_direction & DATA_DIR_RX)
+ val |= SPI_IE_RX;
+
+ tegra_spi_writel(tspi, val, SPI_DMA_CTL);
+ tspi->dma_control_reg = val;
+
+ tspi->is_curr_dma_xfer = false;
+
+ val = tspi->command1_reg;
+ val |= SPI_PIO;
+ tegra_spi_writel(tspi, val, SPI_COMMAND1);
+ return 0;
+}
+
+static int tegra_spi_init_dma_param(struct tegra_spi_data *tspi,
+ bool dma_to_memory)
+{
+ struct dma_chan *dma_chan;
+ u32 *dma_buf;
+ dma_addr_t dma_phys;
+
+ dma_chan = dma_request_chan(tspi->dev, dma_to_memory ? "rx" : "tx");
+ if (IS_ERR(dma_chan))
+ return dev_err_probe(tspi->dev, PTR_ERR(dma_chan),
+ "Dma channel is not available\n");
+
+ dma_buf = dma_alloc_coherent(tspi->dev, tspi->dma_buf_size,
+ &dma_phys, GFP_KERNEL);
+ if (!dma_buf) {
+ dev_err(tspi->dev, " Not able to allocate the dma buffer\n");
+ dma_release_channel(dma_chan);
+ return -ENOMEM;
+ }
+
+ if (dma_to_memory) {
+ tspi->rx_dma_chan = dma_chan;
+ tspi->rx_dma_buf = dma_buf;
+ tspi->rx_dma_phys = dma_phys;
+ } else {
+ tspi->tx_dma_chan = dma_chan;
+ tspi->tx_dma_buf = dma_buf;
+ tspi->tx_dma_phys = dma_phys;
+ }
+ return 0;
+}
+
+static void tegra_spi_deinit_dma_param(struct tegra_spi_data *tspi,
+ bool dma_to_memory)
+{
+ u32 *dma_buf;
+ dma_addr_t dma_phys;
+ struct dma_chan *dma_chan;
+
+ if (dma_to_memory) {
+ dma_buf = tspi->rx_dma_buf;
+ dma_chan = tspi->rx_dma_chan;
+ dma_phys = tspi->rx_dma_phys;
+ tspi->rx_dma_chan = NULL;
+ tspi->rx_dma_buf = NULL;
+ } else {
+ dma_buf = tspi->tx_dma_buf;
+ dma_chan = tspi->tx_dma_chan;
+ dma_phys = tspi->tx_dma_phys;
+ tspi->tx_dma_buf = NULL;
+ tspi->tx_dma_chan = NULL;
+ }
+ if (!dma_chan)
+ return;
+
+ dma_free_coherent(tspi->dev, tspi->dma_buf_size, dma_buf, dma_phys);
+ dma_release_channel(dma_chan);
+}
+
+static int tegra_spi_set_hw_cs_timing(struct spi_device *spi,
+ struct spi_delay *setup,
+ struct spi_delay *hold,
+ struct spi_delay *inactive)
+{
+ struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master);
+ u8 setup_dly, hold_dly, inactive_dly;
+ u32 setup_hold;
+ u32 spi_cs_timing;
+ u32 inactive_cycles;
+ u8 cs_state;
+
+ if ((setup && setup->unit != SPI_DELAY_UNIT_SCK) ||
+ (hold && hold->unit != SPI_DELAY_UNIT_SCK) ||
+ (inactive && inactive->unit != SPI_DELAY_UNIT_SCK)) {
+ dev_err(&spi->dev,
+ "Invalid delay unit %d, should be SPI_DELAY_UNIT_SCK\n",
+ SPI_DELAY_UNIT_SCK);
+ return -EINVAL;
+ }
+
+ setup_dly = setup ? setup->value : 0;
+ hold_dly = hold ? hold->value : 0;
+ inactive_dly = inactive ? inactive->value : 0;
+
+ setup_dly = min_t(u8, setup_dly, MAX_SETUP_HOLD_CYCLES);
+ hold_dly = min_t(u8, hold_dly, MAX_SETUP_HOLD_CYCLES);
+ if (setup_dly && hold_dly) {
+ setup_hold = SPI_SETUP_HOLD(setup_dly - 1, hold_dly - 1);
+ spi_cs_timing = SPI_CS_SETUP_HOLD(tspi->spi_cs_timing1,
+ spi->chip_select,
+ setup_hold);
+ if (tspi->spi_cs_timing1 != spi_cs_timing) {
+ tspi->spi_cs_timing1 = spi_cs_timing;
+ tegra_spi_writel(tspi, spi_cs_timing, SPI_CS_TIMING1);
+ }
+ }
+
+ inactive_cycles = min_t(u8, inactive_dly, MAX_INACTIVE_CYCLES);
+ if (inactive_cycles)
+ inactive_cycles--;
+ cs_state = inactive_cycles ? 0 : 1;
+ spi_cs_timing = tspi->spi_cs_timing2;
+ SPI_SET_CS_ACTIVE_BETWEEN_PACKETS(spi_cs_timing, spi->chip_select,
+ cs_state);
+ SPI_SET_CYCLES_BETWEEN_PACKETS(spi_cs_timing, spi->chip_select,
+ inactive_cycles);
+ if (tspi->spi_cs_timing2 != spi_cs_timing) {
+ tspi->spi_cs_timing2 = spi_cs_timing;
+ tegra_spi_writel(tspi, spi_cs_timing, SPI_CS_TIMING2);
+ }
+
+ return 0;
+}
+
+static u32 tegra_spi_setup_transfer_one(struct spi_device *spi,
+ struct spi_transfer *t,
+ bool is_first_of_msg,
+ bool is_single_xfer)
+{
+ struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master);
+ struct tegra_spi_client_data *cdata = spi->controller_data;
+ u32 speed = t->speed_hz;
+ u8 bits_per_word = t->bits_per_word;
+ u32 command1, command2;
+ int req_mode;
+ u32 tx_tap = 0, rx_tap = 0;
+
+ if (speed != tspi->cur_speed) {
+ clk_set_rate(tspi->clk, speed);
+ tspi->cur_speed = speed;
+ }
+
+ tspi->cur_spi = spi;
+ tspi->cur_pos = 0;
+ tspi->cur_rx_pos = 0;
+ tspi->cur_tx_pos = 0;
+ tspi->curr_xfer = t;
+
+ if (is_first_of_msg) {
+ tegra_spi_clear_status(tspi);
+
+ command1 = tspi->def_command1_reg;
+ command1 |= SPI_BIT_LENGTH(bits_per_word - 1);
+
+ command1 &= ~SPI_CONTROL_MODE_MASK;
+ req_mode = spi->mode & 0x3;
+ if (req_mode == SPI_MODE_0)
+ command1 |= SPI_CONTROL_MODE_0;
+ else if (req_mode == SPI_MODE_1)
+ command1 |= SPI_CONTROL_MODE_1;
+ else if (req_mode == SPI_MODE_2)
+ command1 |= SPI_CONTROL_MODE_2;
+ else if (req_mode == SPI_MODE_3)
+ command1 |= SPI_CONTROL_MODE_3;
+
+ if (spi->mode & SPI_LSB_FIRST)
+ command1 |= SPI_LSBIT_FE;
+ else
+ command1 &= ~SPI_LSBIT_FE;
+
+ if (spi->mode & SPI_3WIRE)
+ command1 |= SPI_BIDIROE;
+ else
+ command1 &= ~SPI_BIDIROE;
+
+ if (tspi->cs_control) {
+ if (tspi->cs_control != spi)
+ tegra_spi_writel(tspi, command1, SPI_COMMAND1);
+ tspi->cs_control = NULL;
+ } else
+ tegra_spi_writel(tspi, command1, SPI_COMMAND1);
+
+ /* GPIO based chip select control */
+ if (spi->cs_gpiod)
+ gpiod_set_value(spi->cs_gpiod, 1);
+
+ if (is_single_xfer && !(t->cs_change)) {
+ tspi->use_hw_based_cs = true;
+ command1 &= ~(SPI_CS_SW_HW | SPI_CS_SW_VAL);
+ } else {
+ tspi->use_hw_based_cs = false;
+ command1 |= SPI_CS_SW_HW;
+ if (spi->mode & SPI_CS_HIGH)
+ command1 |= SPI_CS_SW_VAL;
+ else
+ command1 &= ~SPI_CS_SW_VAL;
+ }
+
+ if (tspi->last_used_cs != spi->chip_select) {
+ if (cdata && cdata->tx_clk_tap_delay)
+ tx_tap = cdata->tx_clk_tap_delay;
+ if (cdata && cdata->rx_clk_tap_delay)
+ rx_tap = cdata->rx_clk_tap_delay;
+ command2 = SPI_TX_TAP_DELAY(tx_tap) |
+ SPI_RX_TAP_DELAY(rx_tap);
+ if (command2 != tspi->def_command2_reg)
+ tegra_spi_writel(tspi, command2, SPI_COMMAND2);
+ tspi->last_used_cs = spi->chip_select;
+ }
+
+ } else {
+ command1 = tspi->command1_reg;
+ command1 &= ~SPI_BIT_LENGTH(~0);
+ command1 |= SPI_BIT_LENGTH(bits_per_word - 1);
+ }
+
+ return command1;
+}
+
+static int tegra_spi_start_transfer_one(struct spi_device *spi,
+ struct spi_transfer *t, u32 command1)
+{
+ struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master);
+ unsigned total_fifo_words;
+ int ret;
+
+ total_fifo_words = tegra_spi_calculate_curr_xfer_param(spi, tspi, t);
+
+ if (t->rx_nbits == SPI_NBITS_DUAL || t->tx_nbits == SPI_NBITS_DUAL)
+ command1 |= SPI_BOTH_EN_BIT;
+ else
+ command1 &= ~SPI_BOTH_EN_BIT;
+
+ if (tspi->is_packed)
+ command1 |= SPI_PACKED;
+ else
+ command1 &= ~SPI_PACKED;
+
+ command1 &= ~(SPI_CS_SEL_MASK | SPI_TX_EN | SPI_RX_EN);
+ tspi->cur_direction = 0;
+ if (t->rx_buf) {
+ command1 |= SPI_RX_EN;
+ tspi->cur_direction |= DATA_DIR_RX;
+ }
+ if (t->tx_buf) {
+ command1 |= SPI_TX_EN;
+ tspi->cur_direction |= DATA_DIR_TX;
+ }
+ command1 |= SPI_CS_SEL(spi->chip_select);
+ tegra_spi_writel(tspi, command1, SPI_COMMAND1);
+ tspi->command1_reg = command1;
+
+ dev_dbg(tspi->dev, "The def 0x%x and written 0x%x\n",
+ tspi->def_command1_reg, (unsigned)command1);
+
+ ret = tegra_spi_flush_fifos(tspi);
+ if (ret < 0)
+ return ret;
+ if (total_fifo_words > SPI_FIFO_DEPTH)
+ ret = tegra_spi_start_dma_based_transfer(tspi, t);
+ else
+ ret = tegra_spi_start_cpu_based_transfer(tspi, t);
+ return ret;
+}
+
+static struct tegra_spi_client_data
+ *tegra_spi_parse_cdata_dt(struct spi_device *spi)
+{
+ struct tegra_spi_client_data *cdata;
+ struct device_node *slave_np;
+
+ slave_np = spi->dev.of_node;
+ if (!slave_np) {
+ dev_dbg(&spi->dev, "device node not found\n");
+ return NULL;
+ }
+
+ cdata = kzalloc(sizeof(*cdata), GFP_KERNEL);
+ if (!cdata)
+ return NULL;
+
+ of_property_read_u32(slave_np, "nvidia,tx-clk-tap-delay",
+ &cdata->tx_clk_tap_delay);
+ of_property_read_u32(slave_np, "nvidia,rx-clk-tap-delay",
+ &cdata->rx_clk_tap_delay);
+ return cdata;
+}
+
+static void tegra_spi_cleanup(struct spi_device *spi)
+{
+ struct tegra_spi_client_data *cdata = spi->controller_data;
+
+ spi->controller_data = NULL;
+ if (spi->dev.of_node)
+ kfree(cdata);
+}
+
+static int tegra_spi_setup(struct spi_device *spi)
+{
+ struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master);
+ struct tegra_spi_client_data *cdata = spi->controller_data;
+ u32 val;
+ unsigned long flags;
+ int ret;
+
+ dev_dbg(&spi->dev, "setup %d bpw, %scpol, %scpha, %dHz\n",
+ spi->bits_per_word,
+ spi->mode & SPI_CPOL ? "" : "~",
+ spi->mode & SPI_CPHA ? "" : "~",
+ spi->max_speed_hz);
+
+ if (!cdata) {
+ cdata = tegra_spi_parse_cdata_dt(spi);
+ spi->controller_data = cdata;
+ }
+
+ ret = pm_runtime_get_sync(tspi->dev);
+ if (ret < 0) {
+ pm_runtime_put_noidle(tspi->dev);
+ dev_err(tspi->dev, "pm runtime failed, e = %d\n", ret);
+ if (cdata)
+ tegra_spi_cleanup(spi);
+ return ret;
+ }
+
+ if (tspi->soc_data->has_intr_mask_reg) {
+ val = tegra_spi_readl(tspi, SPI_INTR_MASK);
+ val &= ~SPI_INTR_ALL_MASK;
+ tegra_spi_writel(tspi, val, SPI_INTR_MASK);
+ }
+
+ spin_lock_irqsave(&tspi->lock, flags);
+ /* GPIO based chip select control */
+ if (spi->cs_gpiod)
+ gpiod_set_value(spi->cs_gpiod, 0);
+
+ val = tspi->def_command1_reg;
+ if (spi->mode & SPI_CS_HIGH)
+ val &= ~SPI_CS_POL_INACTIVE(spi->chip_select);
+ else
+ val |= SPI_CS_POL_INACTIVE(spi->chip_select);
+ tspi->def_command1_reg = val;
+ tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1);
+ spin_unlock_irqrestore(&tspi->lock, flags);
+
+ pm_runtime_put(tspi->dev);
+ return 0;
+}
+
+static void tegra_spi_transfer_end(struct spi_device *spi)
+{
+ struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master);
+ int cs_val = (spi->mode & SPI_CS_HIGH) ? 0 : 1;
+
+ /* GPIO based chip select control */
+ if (spi->cs_gpiod)
+ gpiod_set_value(spi->cs_gpiod, 0);
+
+ if (!tspi->use_hw_based_cs) {
+ if (cs_val)
+ tspi->command1_reg |= SPI_CS_SW_VAL;
+ else
+ tspi->command1_reg &= ~SPI_CS_SW_VAL;
+ tegra_spi_writel(tspi, tspi->command1_reg, SPI_COMMAND1);
+ }
+
+ tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1);
+}
+
+static void tegra_spi_dump_regs(struct tegra_spi_data *tspi)
+{
+ dev_dbg(tspi->dev, "============ SPI REGISTER DUMP ============\n");
+ dev_dbg(tspi->dev, "Command1: 0x%08x | Command2: 0x%08x\n",
+ tegra_spi_readl(tspi, SPI_COMMAND1),
+ tegra_spi_readl(tspi, SPI_COMMAND2));
+ dev_dbg(tspi->dev, "DMA_CTL: 0x%08x | DMA_BLK: 0x%08x\n",
+ tegra_spi_readl(tspi, SPI_DMA_CTL),
+ tegra_spi_readl(tspi, SPI_DMA_BLK));
+ dev_dbg(tspi->dev, "TRANS_STAT: 0x%08x | FIFO_STATUS: 0x%08x\n",
+ tegra_spi_readl(tspi, SPI_TRANS_STATUS),
+ tegra_spi_readl(tspi, SPI_FIFO_STATUS));
+}
+
+static int tegra_spi_transfer_one_message(struct spi_master *master,
+ struct spi_message *msg)
+{
+ bool is_first_msg = true;
+ struct tegra_spi_data *tspi = spi_master_get_devdata(master);
+ struct spi_transfer *xfer;
+ struct spi_device *spi = msg->spi;
+ int ret;
+ bool skip = false;
+ int single_xfer;
+
+ msg->status = 0;
+ msg->actual_length = 0;
+
+ single_xfer = list_is_singular(&msg->transfers);
+ list_for_each_entry(xfer, &msg->transfers, transfer_list) {
+ u32 cmd1;
+
+ reinit_completion(&tspi->xfer_completion);
+
+ cmd1 = tegra_spi_setup_transfer_one(spi, xfer, is_first_msg,
+ single_xfer);
+
+ if (!xfer->len) {
+ ret = 0;
+ skip = true;
+ goto complete_xfer;
+ }
+
+ ret = tegra_spi_start_transfer_one(spi, xfer, cmd1);
+ if (ret < 0) {
+ dev_err(tspi->dev,
+ "spi can not start transfer, err %d\n", ret);
+ goto complete_xfer;
+ }
+
+ is_first_msg = false;
+ ret = wait_for_completion_timeout(&tspi->xfer_completion,
+ SPI_DMA_TIMEOUT);
+ if (WARN_ON(ret == 0)) {
+ dev_err(tspi->dev,
+ "spi transfer timeout, err %d\n", ret);
+ if (tspi->is_curr_dma_xfer &&
+ (tspi->cur_direction & DATA_DIR_TX))
+ dmaengine_terminate_all(tspi->tx_dma_chan);
+ if (tspi->is_curr_dma_xfer &&
+ (tspi->cur_direction & DATA_DIR_RX))
+ dmaengine_terminate_all(tspi->rx_dma_chan);
+ ret = -EIO;
+ tegra_spi_dump_regs(tspi);
+ tegra_spi_flush_fifos(tspi);
+ reset_control_assert(tspi->rst);
+ udelay(2);
+ reset_control_deassert(tspi->rst);
+ tspi->last_used_cs = master->num_chipselect + 1;
+ goto complete_xfer;
+ }
+
+ if (tspi->tx_status || tspi->rx_status) {
+ dev_err(tspi->dev, "Error in Transfer\n");
+ ret = -EIO;
+ tegra_spi_dump_regs(tspi);
+ goto complete_xfer;
+ }
+ msg->actual_length += xfer->len;
+
+complete_xfer:
+ if (ret < 0 || skip) {
+ tegra_spi_transfer_end(spi);
+ spi_transfer_delay_exec(xfer);
+ goto exit;
+ } else if (list_is_last(&xfer->transfer_list,
+ &msg->transfers)) {
+ if (xfer->cs_change)
+ tspi->cs_control = spi;
+ else {
+ tegra_spi_transfer_end(spi);
+ spi_transfer_delay_exec(xfer);
+ }
+ } else if (xfer->cs_change) {
+ tegra_spi_transfer_end(spi);
+ spi_transfer_delay_exec(xfer);
+ }
+
+ }
+ ret = 0;
+exit:
+ msg->status = ret;
+ spi_finalize_current_message(master);
+ return ret;
+}
+
+static irqreturn_t handle_cpu_based_xfer(struct tegra_spi_data *tspi)
+{
+ struct spi_transfer *t = tspi->curr_xfer;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tspi->lock, flags);
+ if (tspi->tx_status || tspi->rx_status) {
+ dev_err(tspi->dev, "CpuXfer ERROR bit set 0x%x\n",
+ tspi->status_reg);
+ dev_err(tspi->dev, "CpuXfer 0x%08x:0x%08x\n",
+ tspi->command1_reg, tspi->dma_control_reg);
+ tegra_spi_dump_regs(tspi);
+ tegra_spi_flush_fifos(tspi);
+ complete(&tspi->xfer_completion);
+ spin_unlock_irqrestore(&tspi->lock, flags);
+ reset_control_assert(tspi->rst);
+ udelay(2);
+ reset_control_deassert(tspi->rst);
+ return IRQ_HANDLED;
+ }
+
+ if (tspi->cur_direction & DATA_DIR_RX)
+ tegra_spi_read_rx_fifo_to_client_rxbuf(tspi, t);
+
+ if (tspi->cur_direction & DATA_DIR_TX)
+ tspi->cur_pos = tspi->cur_tx_pos;
+ else
+ tspi->cur_pos = tspi->cur_rx_pos;
+
+ if (tspi->cur_pos == t->len) {
+ complete(&tspi->xfer_completion);
+ goto exit;
+ }
+
+ tegra_spi_calculate_curr_xfer_param(tspi->cur_spi, tspi, t);
+ tegra_spi_start_cpu_based_transfer(tspi, t);
+exit:
+ spin_unlock_irqrestore(&tspi->lock, flags);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t handle_dma_based_xfer(struct tegra_spi_data *tspi)
+{
+ struct spi_transfer *t = tspi->curr_xfer;
+ long wait_status;
+ int err = 0;
+ unsigned total_fifo_words;
+ unsigned long flags;
+
+ /* Abort dmas if any error */
+ if (tspi->cur_direction & DATA_DIR_TX) {
+ if (tspi->tx_status) {
+ dmaengine_terminate_all(tspi->tx_dma_chan);
+ err += 1;
+ } else {
+ wait_status = wait_for_completion_interruptible_timeout(
+ &tspi->tx_dma_complete, SPI_DMA_TIMEOUT);
+ if (wait_status <= 0) {
+ dmaengine_terminate_all(tspi->tx_dma_chan);
+ dev_err(tspi->dev, "TxDma Xfer failed\n");
+ err += 1;
+ }
+ }
+ }
+
+ if (tspi->cur_direction & DATA_DIR_RX) {
+ if (tspi->rx_status) {
+ dmaengine_terminate_all(tspi->rx_dma_chan);
+ err += 2;
+ } else {
+ wait_status = wait_for_completion_interruptible_timeout(
+ &tspi->rx_dma_complete, SPI_DMA_TIMEOUT);
+ if (wait_status <= 0) {
+ dmaengine_terminate_all(tspi->rx_dma_chan);
+ dev_err(tspi->dev, "RxDma Xfer failed\n");
+ err += 2;
+ }
+ }
+ }
+
+ spin_lock_irqsave(&tspi->lock, flags);
+ if (err) {
+ dev_err(tspi->dev, "DmaXfer: ERROR bit set 0x%x\n",
+ tspi->status_reg);
+ dev_err(tspi->dev, "DmaXfer 0x%08x:0x%08x\n",
+ tspi->command1_reg, tspi->dma_control_reg);
+ tegra_spi_dump_regs(tspi);
+ tegra_spi_flush_fifos(tspi);
+ complete(&tspi->xfer_completion);
+ spin_unlock_irqrestore(&tspi->lock, flags);
+ reset_control_assert(tspi->rst);
+ udelay(2);
+ reset_control_deassert(tspi->rst);
+ return IRQ_HANDLED;
+ }
+
+ if (tspi->cur_direction & DATA_DIR_RX)
+ tegra_spi_copy_spi_rxbuf_to_client_rxbuf(tspi, t);
+
+ if (tspi->cur_direction & DATA_DIR_TX)
+ tspi->cur_pos = tspi->cur_tx_pos;
+ else
+ tspi->cur_pos = tspi->cur_rx_pos;
+
+ if (tspi->cur_pos == t->len) {
+ complete(&tspi->xfer_completion);
+ goto exit;
+ }
+
+ /* Continue transfer in current message */
+ total_fifo_words = tegra_spi_calculate_curr_xfer_param(tspi->cur_spi,
+ tspi, t);
+ if (total_fifo_words > SPI_FIFO_DEPTH)
+ err = tegra_spi_start_dma_based_transfer(tspi, t);
+ else
+ err = tegra_spi_start_cpu_based_transfer(tspi, t);
+
+exit:
+ spin_unlock_irqrestore(&tspi->lock, flags);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t tegra_spi_isr_thread(int irq, void *context_data)
+{
+ struct tegra_spi_data *tspi = context_data;
+
+ if (!tspi->is_curr_dma_xfer)
+ return handle_cpu_based_xfer(tspi);
+ return handle_dma_based_xfer(tspi);
+}
+
+static irqreturn_t tegra_spi_isr(int irq, void *context_data)
+{
+ struct tegra_spi_data *tspi = context_data;
+
+ tspi->status_reg = tegra_spi_readl(tspi, SPI_FIFO_STATUS);
+ if (tspi->cur_direction & DATA_DIR_TX)
+ tspi->tx_status = tspi->status_reg &
+ (SPI_TX_FIFO_UNF | SPI_TX_FIFO_OVF);
+
+ if (tspi->cur_direction & DATA_DIR_RX)
+ tspi->rx_status = tspi->status_reg &
+ (SPI_RX_FIFO_OVF | SPI_RX_FIFO_UNF);
+ tegra_spi_clear_status(tspi);
+
+ return IRQ_WAKE_THREAD;
+}
+
+static struct tegra_spi_soc_data tegra114_spi_soc_data = {
+ .has_intr_mask_reg = false,
+};
+
+static struct tegra_spi_soc_data tegra124_spi_soc_data = {
+ .has_intr_mask_reg = false,
+};
+
+static struct tegra_spi_soc_data tegra210_spi_soc_data = {
+ .has_intr_mask_reg = true,
+};
+
+static const struct of_device_id tegra_spi_of_match[] = {
+ {
+ .compatible = "nvidia,tegra114-spi",
+ .data = &tegra114_spi_soc_data,
+ }, {
+ .compatible = "nvidia,tegra124-spi",
+ .data = &tegra124_spi_soc_data,
+ }, {
+ .compatible = "nvidia,tegra210-spi",
+ .data = &tegra210_spi_soc_data,
+ },
+ {}
+};
+MODULE_DEVICE_TABLE(of, tegra_spi_of_match);
+
+static int tegra_spi_probe(struct platform_device *pdev)
+{
+ struct spi_master *master;
+ struct tegra_spi_data *tspi;
+ struct resource *r;
+ int ret, spi_irq;
+ int bus_num;
+
+ master = spi_alloc_master(&pdev->dev, sizeof(*tspi));
+ if (!master) {
+ dev_err(&pdev->dev, "master allocation failed\n");
+ return -ENOMEM;
+ }
+ platform_set_drvdata(pdev, master);
+ tspi = spi_master_get_devdata(master);
+
+ if (of_property_read_u32(pdev->dev.of_node, "spi-max-frequency",
+ &master->max_speed_hz))
+ master->max_speed_hz = 25000000; /* 25MHz */
+
+ /* the spi->mode bits understood by this driver: */
+ master->use_gpio_descriptors = true;
+ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST |
+ SPI_TX_DUAL | SPI_RX_DUAL | SPI_3WIRE;
+ master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
+ master->setup = tegra_spi_setup;
+ master->cleanup = tegra_spi_cleanup;
+ master->transfer_one_message = tegra_spi_transfer_one_message;
+ master->set_cs_timing = tegra_spi_set_hw_cs_timing;
+ master->num_chipselect = MAX_CHIP_SELECT;
+ master->auto_runtime_pm = true;
+ bus_num = of_alias_get_id(pdev->dev.of_node, "spi");
+ if (bus_num >= 0)
+ master->bus_num = bus_num;
+
+ tspi->master = master;
+ tspi->dev = &pdev->dev;
+ spin_lock_init(&tspi->lock);
+
+ tspi->soc_data = of_device_get_match_data(&pdev->dev);
+ if (!tspi->soc_data) {
+ dev_err(&pdev->dev, "unsupported tegra\n");
+ ret = -ENODEV;
+ goto exit_free_master;
+ }
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ tspi->base = devm_ioremap_resource(&pdev->dev, r);
+ if (IS_ERR(tspi->base)) {
+ ret = PTR_ERR(tspi->base);
+ goto exit_free_master;
+ }
+ tspi->phys = r->start;
+
+ spi_irq = platform_get_irq(pdev, 0);
+ if (spi_irq < 0) {
+ ret = spi_irq;
+ goto exit_free_master;
+ }
+ tspi->irq = spi_irq;
+
+ tspi->clk = devm_clk_get(&pdev->dev, "spi");
+ if (IS_ERR(tspi->clk)) {
+ dev_err(&pdev->dev, "can not get clock\n");
+ ret = PTR_ERR(tspi->clk);
+ goto exit_free_master;
+ }
+
+ tspi->rst = devm_reset_control_get_exclusive(&pdev->dev, "spi");
+ if (IS_ERR(tspi->rst)) {
+ dev_err(&pdev->dev, "can not get reset\n");
+ ret = PTR_ERR(tspi->rst);
+ goto exit_free_master;
+ }
+
+ tspi->max_buf_size = SPI_FIFO_DEPTH << 2;
+ tspi->dma_buf_size = DEFAULT_SPI_DMA_BUF_LEN;
+
+ ret = tegra_spi_init_dma_param(tspi, true);
+ if (ret < 0)
+ goto exit_free_master;
+ ret = tegra_spi_init_dma_param(tspi, false);
+ if (ret < 0)
+ goto exit_rx_dma_free;
+ tspi->max_buf_size = tspi->dma_buf_size;
+ init_completion(&tspi->tx_dma_complete);
+ init_completion(&tspi->rx_dma_complete);
+
+ init_completion(&tspi->xfer_completion);
+
+ pm_runtime_enable(&pdev->dev);
+ if (!pm_runtime_enabled(&pdev->dev)) {
+ ret = tegra_spi_runtime_resume(&pdev->dev);
+ if (ret)
+ goto exit_pm_disable;
+ }
+
+ ret = pm_runtime_get_sync(&pdev->dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "pm runtime get failed, e = %d\n", ret);
+ pm_runtime_put_noidle(&pdev->dev);
+ goto exit_pm_disable;
+ }
+
+ reset_control_assert(tspi->rst);
+ udelay(2);
+ reset_control_deassert(tspi->rst);
+ tspi->def_command1_reg = SPI_M_S;
+ tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1);
+ tspi->spi_cs_timing1 = tegra_spi_readl(tspi, SPI_CS_TIMING1);
+ tspi->spi_cs_timing2 = tegra_spi_readl(tspi, SPI_CS_TIMING2);
+ tspi->def_command2_reg = tegra_spi_readl(tspi, SPI_COMMAND2);
+ tspi->last_used_cs = master->num_chipselect + 1;
+ pm_runtime_put(&pdev->dev);
+ ret = request_threaded_irq(tspi->irq, tegra_spi_isr,
+ tegra_spi_isr_thread, IRQF_ONESHOT,
+ dev_name(&pdev->dev), tspi);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n",
+ tspi->irq);
+ goto exit_pm_disable;
+ }
+
+ master->dev.of_node = pdev->dev.of_node;
+ ret = devm_spi_register_master(&pdev->dev, master);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "can not register to master err %d\n", ret);
+ goto exit_free_irq;
+ }
+ return ret;
+
+exit_free_irq:
+ free_irq(spi_irq, tspi);
+exit_pm_disable:
+ pm_runtime_disable(&pdev->dev);
+ if (!pm_runtime_status_suspended(&pdev->dev))
+ tegra_spi_runtime_suspend(&pdev->dev);
+ tegra_spi_deinit_dma_param(tspi, false);
+exit_rx_dma_free:
+ tegra_spi_deinit_dma_param(tspi, true);
+exit_free_master:
+ spi_master_put(master);
+ return ret;
+}
+
+static int tegra_spi_remove(struct platform_device *pdev)
+{
+ struct spi_master *master = platform_get_drvdata(pdev);
+ struct tegra_spi_data *tspi = spi_master_get_devdata(master);
+
+ free_irq(tspi->irq, tspi);
+
+ if (tspi->tx_dma_chan)
+ tegra_spi_deinit_dma_param(tspi, false);
+
+ if (tspi->rx_dma_chan)
+ tegra_spi_deinit_dma_param(tspi, true);
+
+ pm_runtime_disable(&pdev->dev);
+ if (!pm_runtime_status_suspended(&pdev->dev))
+ tegra_spi_runtime_suspend(&pdev->dev);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int tegra_spi_suspend(struct device *dev)
+{
+ struct spi_master *master = dev_get_drvdata(dev);
+
+ return spi_master_suspend(master);
+}
+
+static int tegra_spi_resume(struct device *dev)
+{
+ struct spi_master *master = dev_get_drvdata(dev);
+ struct tegra_spi_data *tspi = spi_master_get_devdata(master);
+ int ret;
+
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ pm_runtime_put_noidle(dev);
+ dev_err(dev, "pm runtime failed, e = %d\n", ret);
+ return ret;
+ }
+ tegra_spi_writel(tspi, tspi->command1_reg, SPI_COMMAND1);
+ tegra_spi_writel(tspi, tspi->def_command2_reg, SPI_COMMAND2);
+ tspi->last_used_cs = master->num_chipselect + 1;
+ pm_runtime_put(dev);
+
+ return spi_master_resume(master);
+}
+#endif
+
+static int tegra_spi_runtime_suspend(struct device *dev)
+{
+ struct spi_master *master = dev_get_drvdata(dev);
+ struct tegra_spi_data *tspi = spi_master_get_devdata(master);
+
+ /* Flush all write which are in PPSB queue by reading back */
+ tegra_spi_readl(tspi, SPI_COMMAND1);
+
+ clk_disable_unprepare(tspi->clk);
+ return 0;
+}
+
+static int tegra_spi_runtime_resume(struct device *dev)
+{
+ struct spi_master *master = dev_get_drvdata(dev);
+ struct tegra_spi_data *tspi = spi_master_get_devdata(master);
+ int ret;
+
+ ret = clk_prepare_enable(tspi->clk);
+ if (ret < 0) {
+ dev_err(tspi->dev, "clk_prepare failed: %d\n", ret);
+ return ret;
+ }
+ return 0;
+}
+
+static const struct dev_pm_ops tegra_spi_pm_ops = {
+ SET_RUNTIME_PM_OPS(tegra_spi_runtime_suspend,
+ tegra_spi_runtime_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(tegra_spi_suspend, tegra_spi_resume)
+};
+static struct platform_driver tegra_spi_driver = {
+ .driver = {
+ .name = "spi-tegra114",
+ .pm = &tegra_spi_pm_ops,
+ .of_match_table = tegra_spi_of_match,
+ },
+ .probe = tegra_spi_probe,
+ .remove = tegra_spi_remove,
+};
+module_platform_driver(tegra_spi_driver);
+
+MODULE_ALIAS("platform:spi-tegra114");
+MODULE_DESCRIPTION("NVIDIA Tegra114 SPI Controller Driver");
+MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
+MODULE_LICENSE("GPL v2");