diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/spi/spi-tegra114.c | 1540 |
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"); |