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drivers/spi/spi-tegra20-slink.c
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/* * SPI driver for Nvidia's Tegra20/Tegra30 SLINK Controller. * * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #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> |
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#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> |
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#include <linux/reset.h> |
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#include <linux/spi/spi.h> |
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#define SLINK_COMMAND 0x000 #define SLINK_BIT_LENGTH(x) (((x) & 0x1f) << 0) #define SLINK_WORD_SIZE(x) (((x) & 0x1f) << 5) #define SLINK_BOTH_EN (1 << 10) #define SLINK_CS_SW (1 << 11) #define SLINK_CS_VALUE (1 << 12) #define SLINK_CS_POLARITY (1 << 13) #define SLINK_IDLE_SDA_DRIVE_LOW (0 << 16) #define SLINK_IDLE_SDA_DRIVE_HIGH (1 << 16) #define SLINK_IDLE_SDA_PULL_LOW (2 << 16) #define SLINK_IDLE_SDA_PULL_HIGH (3 << 16) #define SLINK_IDLE_SDA_MASK (3 << 16) #define SLINK_CS_POLARITY1 (1 << 20) #define SLINK_CK_SDA (1 << 21) #define SLINK_CS_POLARITY2 (1 << 22) #define SLINK_CS_POLARITY3 (1 << 23) #define SLINK_IDLE_SCLK_DRIVE_LOW (0 << 24) #define SLINK_IDLE_SCLK_DRIVE_HIGH (1 << 24) #define SLINK_IDLE_SCLK_PULL_LOW (2 << 24) #define SLINK_IDLE_SCLK_PULL_HIGH (3 << 24) #define SLINK_IDLE_SCLK_MASK (3 << 24) #define SLINK_M_S (1 << 28) #define SLINK_WAIT (1 << 29) #define SLINK_GO (1 << 30) #define SLINK_ENB (1 << 31) #define SLINK_MODES (SLINK_IDLE_SCLK_MASK | SLINK_CK_SDA) #define SLINK_COMMAND2 0x004 #define SLINK_LSBFE (1 << 0) #define SLINK_SSOE (1 << 1) #define SLINK_SPIE (1 << 4) #define SLINK_BIDIROE (1 << 6) #define SLINK_MODFEN (1 << 7) #define SLINK_INT_SIZE(x) (((x) & 0x1f) << 8) #define SLINK_CS_ACTIVE_BETWEEN (1 << 17) #define SLINK_SS_EN_CS(x) (((x) & 0x3) << 18) #define SLINK_SS_SETUP(x) (((x) & 0x3) << 20) #define SLINK_FIFO_REFILLS_0 (0 << 22) #define SLINK_FIFO_REFILLS_1 (1 << 22) #define SLINK_FIFO_REFILLS_2 (2 << 22) #define SLINK_FIFO_REFILLS_3 (3 << 22) #define SLINK_FIFO_REFILLS_MASK (3 << 22) #define SLINK_WAIT_PACK_INT(x) (((x) & 0x7) << 26) #define SLINK_SPC0 (1 << 29) #define SLINK_TXEN (1 << 30) #define SLINK_RXEN (1 << 31) #define SLINK_STATUS 0x008 #define SLINK_COUNT(val) (((val) >> 0) & 0x1f) #define SLINK_WORD(val) (((val) >> 5) & 0x1f) #define SLINK_BLK_CNT(val) (((val) >> 0) & 0xffff) #define SLINK_MODF (1 << 16) #define SLINK_RX_UNF (1 << 18) #define SLINK_TX_OVF (1 << 19) #define SLINK_TX_FULL (1 << 20) #define SLINK_TX_EMPTY (1 << 21) #define SLINK_RX_FULL (1 << 22) #define SLINK_RX_EMPTY (1 << 23) #define SLINK_TX_UNF (1 << 24) #define SLINK_RX_OVF (1 << 25) #define SLINK_TX_FLUSH (1 << 26) #define SLINK_RX_FLUSH (1 << 27) #define SLINK_SCLK (1 << 28) #define SLINK_ERR (1 << 29) #define SLINK_RDY (1 << 30) #define SLINK_BSY (1 << 31) #define SLINK_FIFO_ERROR (SLINK_TX_OVF | SLINK_RX_UNF | \ SLINK_TX_UNF | SLINK_RX_OVF) #define SLINK_FIFO_EMPTY (SLINK_TX_EMPTY | SLINK_RX_EMPTY) #define SLINK_MAS_DATA 0x010 #define SLINK_SLAVE_DATA 0x014 #define SLINK_DMA_CTL 0x018 #define SLINK_DMA_BLOCK_SIZE(x) (((x) & 0xffff) << 0) #define SLINK_TX_TRIG_1 (0 << 16) #define SLINK_TX_TRIG_4 (1 << 16) #define SLINK_TX_TRIG_8 (2 << 16) #define SLINK_TX_TRIG_16 (3 << 16) #define SLINK_TX_TRIG_MASK (3 << 16) #define SLINK_RX_TRIG_1 (0 << 18) #define SLINK_RX_TRIG_4 (1 << 18) #define SLINK_RX_TRIG_8 (2 << 18) #define SLINK_RX_TRIG_16 (3 << 18) #define SLINK_RX_TRIG_MASK (3 << 18) #define SLINK_PACKED (1 << 20) #define SLINK_PACK_SIZE_4 (0 << 21) #define SLINK_PACK_SIZE_8 (1 << 21) #define SLINK_PACK_SIZE_16 (2 << 21) #define SLINK_PACK_SIZE_32 (3 << 21) #define SLINK_PACK_SIZE_MASK (3 << 21) #define SLINK_IE_TXC (1 << 26) #define SLINK_IE_RXC (1 << 27) #define SLINK_DMA_EN (1 << 31) #define SLINK_STATUS2 0x01c #define SLINK_TX_FIFO_EMPTY_COUNT(val) (((val) & 0x3f) >> 0) #define SLINK_RX_FIFO_FULL_COUNT(val) (((val) & 0x3f0000) >> 16) #define SLINK_SS_HOLD_TIME(val) (((val) & 0xF) << 6) #define SLINK_TX_FIFO 0x100 #define SLINK_RX_FIFO 0x180 #define DATA_DIR_TX (1 << 0) #define DATA_DIR_RX (1 << 1) #define SLINK_DMA_TIMEOUT (msecs_to_jiffies(1000)) #define DEFAULT_SPI_DMA_BUF_LEN (16*1024) #define TX_FIFO_EMPTY_COUNT_MAX SLINK_TX_FIFO_EMPTY_COUNT(0x20) #define RX_FIFO_FULL_COUNT_ZERO SLINK_RX_FIFO_FULL_COUNT(0) #define SLINK_STATUS2_RESET \ (TX_FIFO_EMPTY_COUNT_MAX | RX_FIFO_FULL_COUNT_ZERO << 16) #define MAX_CHIP_SELECT 4 #define SLINK_FIFO_DEPTH 32 struct tegra_slink_chip_data { bool cs_hold_time; }; struct tegra_slink_data { struct device *dev; struct spi_master *master; const struct tegra_slink_chip_data *chip_data; spinlock_t lock; struct clk *clk; |
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struct reset_control *rst; |
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void __iomem *base; phys_addr_t phys; unsigned irq; |
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u32 cur_speed; struct spi_device *cur_spi; unsigned cur_pos; unsigned cur_len; 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; |
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struct completion rx_dma_complete; struct completion tx_dma_complete; u32 tx_status; u32 rx_status; u32 status_reg; bool is_packed; |
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u32 packed_size; |
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u32 command_reg; u32 command2_reg; u32 dma_control_reg; u32 def_command_reg; u32 def_command2_reg; 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; }; static int tegra_slink_runtime_suspend(struct device *dev); static int tegra_slink_runtime_resume(struct device *dev); |
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static inline u32 tegra_slink_readl(struct tegra_slink_data *tspi, |
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unsigned long reg) { return readl(tspi->base + reg); } static inline void tegra_slink_writel(struct tegra_slink_data *tspi, |
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u32 val, unsigned long reg) |
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{ writel(val, tspi->base + reg); /* Read back register to make sure that register writes completed */ if (reg != SLINK_TX_FIFO) readl(tspi->base + SLINK_MAS_DATA); } static void tegra_slink_clear_status(struct tegra_slink_data *tspi) { |
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u32 val_write; |
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|
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tegra_slink_readl(tspi, SLINK_STATUS); |
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/* Write 1 to clear status register */ val_write = SLINK_RDY | SLINK_FIFO_ERROR; tegra_slink_writel(tspi, val_write, SLINK_STATUS); } |
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static u32 tegra_slink_get_packed_size(struct tegra_slink_data *tspi, |
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struct spi_transfer *t) { |
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switch (tspi->bytes_per_word) { case 0: |
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return SLINK_PACK_SIZE_4; |
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case 1: |
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return SLINK_PACK_SIZE_8; |
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case 2: |
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return SLINK_PACK_SIZE_16; |
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case 4: |
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return SLINK_PACK_SIZE_32; |
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default: |
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return 0; |
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} |
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} static unsigned tegra_slink_calculate_curr_xfer_param( struct spi_device *spi, struct tegra_slink_data *tspi, struct spi_transfer *t) { unsigned remain_len = t->len - tspi->cur_pos; unsigned max_word; |
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unsigned bits_per_word; |
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unsigned max_len; unsigned total_fifo_words; |
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bits_per_word = t->bits_per_word; |
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tspi->bytes_per_word = DIV_ROUND_UP(bits_per_word, 8); |
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if (bits_per_word == 8 || bits_per_word == 16) { tspi->is_packed = 1; tspi->words_per_32bit = 32/bits_per_word; } else { tspi->is_packed = 0; tspi->words_per_32bit = 1; } tspi->packed_size = tegra_slink_get_packed_size(tspi, t); 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/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_slink_fill_tx_fifo_from_client_txbuf( struct tegra_slink_data *tspi, struct spi_transfer *t) { unsigned nbytes; unsigned tx_empty_count; |
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u32 fifo_status; |
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unsigned max_n_32bit; unsigned i, count; |
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unsigned int written_words; unsigned fifo_words_left; u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos; fifo_status = tegra_slink_readl(tspi, SLINK_STATUS2); tx_empty_count = SLINK_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++) { |
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u32 x = 0; |
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for (i = 0; (i < 4) && nbytes; i++, nbytes--) |
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x |= (u32)(*tx_buf++) << (i * 8); |
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tegra_slink_writel(tspi, x, SLINK_TX_FIFO); } } else { max_n_32bit = min(tspi->curr_dma_words, tx_empty_count); written_words = max_n_32bit; nbytes = written_words * tspi->bytes_per_word; for (count = 0; count < max_n_32bit; count++) { |
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u32 x = 0; |
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for (i = 0; nbytes && (i < tspi->bytes_per_word); i++, nbytes--) |
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x |= (u32)(*tx_buf++) << (i * 8); |
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tegra_slink_writel(tspi, x, SLINK_TX_FIFO); } } tspi->cur_tx_pos += written_words * tspi->bytes_per_word; return written_words; } static unsigned int tegra_slink_read_rx_fifo_to_client_rxbuf( struct tegra_slink_data *tspi, struct spi_transfer *t) { unsigned rx_full_count; |
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u32 fifo_status; |
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unsigned i, count; |
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unsigned int read_words = 0; unsigned len; u8 *rx_buf = (u8 *)t->rx_buf + tspi->cur_rx_pos; fifo_status = tegra_slink_readl(tspi, SLINK_STATUS2); rx_full_count = SLINK_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++) { |
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u32 x = tegra_slink_readl(tspi, SLINK_RX_FIFO); |
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for (i = 0; len && (i < 4); i++, len--) *rx_buf++ = (x >> i*8) & 0xFF; } tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word; read_words += tspi->curr_dma_words; } else { |
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for (count = 0; count < rx_full_count; count++) { |
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u32 x = tegra_slink_readl(tspi, SLINK_RX_FIFO); |
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for (i = 0; (i < tspi->bytes_per_word); i++) *rx_buf++ = (x >> (i*8)) & 0xFF; } tspi->cur_rx_pos += rx_full_count * tspi->bytes_per_word; read_words += rx_full_count; } return read_words; } static void tegra_slink_copy_client_txbuf_to_spi_txbuf( struct tegra_slink_data *tspi, struct spi_transfer *t) { |
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/* 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) { |
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unsigned len = tspi->curr_dma_words * tspi->bytes_per_word; |
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memcpy(tspi->tx_dma_buf, t->tx_buf + tspi->cur_pos, len); } 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; |
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for (count = 0; count < tspi->curr_dma_words; count++) { |
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u32 x = 0; |
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for (i = 0; consume && (i < tspi->bytes_per_word); i++, consume--) |
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x |= (u32)(*tx_buf++) << (i * 8); |
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tspi->tx_dma_buf[count] = x; } } tspi->cur_tx_pos += tspi->curr_dma_words * tspi->bytes_per_word; /* 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_slink_copy_spi_rxbuf_to_client_rxbuf( struct tegra_slink_data *tspi, struct spi_transfer *t) { unsigned len; /* 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) { len = tspi->curr_dma_words * tspi->bytes_per_word; memcpy(t->rx_buf + tspi->cur_rx_pos, tspi->rx_dma_buf, len); } else { unsigned int i; unsigned int count; unsigned char *rx_buf = t->rx_buf + tspi->cur_rx_pos; |
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u32 rx_mask = ((u32)1 << t->bits_per_word) - 1; |
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for (count = 0; count < tspi->curr_dma_words; count++) { |
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u32 x = tspi->rx_dma_buf[count] & rx_mask; |
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for (i = 0; (i < tspi->bytes_per_word); i++) *rx_buf++ = (x >> (i*8)) & 0xFF; } } tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word; /* 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_slink_dma_complete(void *args) { struct completion *dma_complete = args; complete(dma_complete); } static int tegra_slink_start_tx_dma(struct tegra_slink_data *tspi, int len) { |
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reinit_completion(&tspi->tx_dma_complete); |
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tspi->tx_dma_desc = dmaengine_prep_slave_single(tspi->tx_dma_chan, tspi->tx_dma_phys, len, DMA_MEM_TO_DEV, |
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DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
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if (!tspi->tx_dma_desc) { dev_err(tspi->dev, "Not able to get desc for Tx "); return -EIO; } tspi->tx_dma_desc->callback = tegra_slink_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_slink_start_rx_dma(struct tegra_slink_data *tspi, int len) { |
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reinit_completion(&tspi->rx_dma_complete); |
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tspi->rx_dma_desc = dmaengine_prep_slave_single(tspi->rx_dma_chan, tspi->rx_dma_phys, len, DMA_DEV_TO_MEM, |
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DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
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if (!tspi->rx_dma_desc) { dev_err(tspi->dev, "Not able to get desc for Rx "); return -EIO; } tspi->rx_dma_desc->callback = tegra_slink_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_slink_start_dma_based_transfer( struct tegra_slink_data *tspi, struct spi_transfer *t) { |
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u32 val; |
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unsigned int len; int ret = 0; |
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u32 status; |
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/* Make sure that Rx and Tx fifo are empty */ status = tegra_slink_readl(tspi, SLINK_STATUS); if ((status & SLINK_FIFO_EMPTY) != SLINK_FIFO_EMPTY) { |
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dev_err(tspi->dev, "Rx/Tx fifo are not empty status 0x%08x ", (unsigned)status); |
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return -EIO; } val = SLINK_DMA_BLOCK_SIZE(tspi->curr_dma_words - 1); val |= tspi->packed_size; 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 |= SLINK_TX_TRIG_1 | SLINK_RX_TRIG_1; else if (((len) >> 4) & 0x1) val |= SLINK_TX_TRIG_4 | SLINK_RX_TRIG_4; else val |= SLINK_TX_TRIG_8 | SLINK_RX_TRIG_8; if (tspi->cur_direction & DATA_DIR_TX) val |= SLINK_IE_TXC; if (tspi->cur_direction & DATA_DIR_RX) val |= SLINK_IE_RXC; tegra_slink_writel(tspi, val, SLINK_DMA_CTL); tspi->dma_control_reg = val; if (tspi->cur_direction & DATA_DIR_TX) { tegra_slink_copy_client_txbuf_to_spi_txbuf(tspi, t); wmb(); ret = tegra_slink_start_tx_dma(tspi, len); if (ret < 0) { dev_err(tspi->dev, "Starting tx dma failed, err %d ", ret); return ret; } /* Wait for tx fifo to be fill before starting slink */ |
5fd38677a spi: tegra20-slin... |
535 536 537 |
status = tegra_slink_readl(tspi, SLINK_STATUS); while (!(status & SLINK_TX_FULL)) status = tegra_slink_readl(tspi, SLINK_STATUS); |
dc4dc3605 spi: tegra: add s... |
538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 |
} if (tspi->cur_direction & DATA_DIR_RX) { /* 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_slink_start_rx_dma(tspi, len); if (ret < 0) { dev_err(tspi->dev, "Starting rx dma failed, err %d ", ret); if (tspi->cur_direction & DATA_DIR_TX) dmaengine_terminate_all(tspi->tx_dma_chan); return ret; } } tspi->is_curr_dma_xfer = true; if (tspi->is_packed) { val |= SLINK_PACKED; tegra_slink_writel(tspi, val, SLINK_DMA_CTL); /* HW need small delay after settign Packed mode */ udelay(1); } tspi->dma_control_reg = val; val |= SLINK_DMA_EN; tegra_slink_writel(tspi, val, SLINK_DMA_CTL); return ret; } static int tegra_slink_start_cpu_based_transfer( struct tegra_slink_data *tspi, struct spi_transfer *t) { |
5fd38677a spi: tegra20-slin... |
572 |
u32 val; |
dc4dc3605 spi: tegra: add s... |
573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 |
unsigned cur_words; val = tspi->packed_size; if (tspi->cur_direction & DATA_DIR_TX) val |= SLINK_IE_TXC; if (tspi->cur_direction & DATA_DIR_RX) val |= SLINK_IE_RXC; tegra_slink_writel(tspi, val, SLINK_DMA_CTL); tspi->dma_control_reg = val; if (tspi->cur_direction & DATA_DIR_TX) cur_words = tegra_slink_fill_tx_fifo_from_client_txbuf(tspi, t); else cur_words = tspi->curr_dma_words; val |= SLINK_DMA_BLOCK_SIZE(cur_words - 1); tegra_slink_writel(tspi, val, SLINK_DMA_CTL); tspi->dma_control_reg = val; tspi->is_curr_dma_xfer = false; if (tspi->is_packed) { val |= SLINK_PACKED; tegra_slink_writel(tspi, val, SLINK_DMA_CTL); udelay(1); wmb(); } tspi->dma_control_reg = val; val |= SLINK_DMA_EN; tegra_slink_writel(tspi, val, SLINK_DMA_CTL); return 0; } static int tegra_slink_init_dma_param(struct tegra_slink_data *tspi, bool dma_to_memory) { struct dma_chan *dma_chan; u32 *dma_buf; dma_addr_t dma_phys; int ret; struct dma_slave_config dma_sconfig; |
dc4dc3605 spi: tegra: add s... |
614 |
|
8a0a1af30 spi: tegra: check... |
615 616 |
dma_chan = dma_request_slave_channel_reason(tspi->dev, dma_to_memory ? "rx" : "tx"); |
a915d150f spi: tegra: conve... |
617 618 619 620 621 622 623 |
if (IS_ERR(dma_chan)) { ret = PTR_ERR(dma_chan); if (ret != -EPROBE_DEFER) dev_err(tspi->dev, "Dma channel is not available: %d ", ret); return ret; |
dc4dc3605 spi: tegra: add s... |
624 625 626 627 628 629 630 631 632 633 |
} 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 "); dma_release_channel(dma_chan); return -ENOMEM; } |
dc4dc3605 spi: tegra: add s... |
634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 |
if (dma_to_memory) { dma_sconfig.src_addr = tspi->phys + SLINK_RX_FIFO; dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; dma_sconfig.src_maxburst = 0; } else { dma_sconfig.dst_addr = tspi->phys + SLINK_TX_FIFO; dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; dma_sconfig.dst_maxburst = 0; } ret = dmaengine_slave_config(dma_chan, &dma_sconfig); if (ret) goto scrub; 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; scrub: dma_free_coherent(tspi->dev, tspi->dma_buf_size, dma_buf, dma_phys); dma_release_channel(dma_chan); return ret; } static void tegra_slink_deinit_dma_param(struct tegra_slink_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_slink_start_transfer_one(struct spi_device *spi, |
f178e3dec spi/tegra20-slink... |
692 |
struct spi_transfer *t) |
dc4dc3605 spi: tegra: add s... |
693 694 695 696 697 698 |
{ struct tegra_slink_data *tspi = spi_master_get_devdata(spi->master); u32 speed; u8 bits_per_word; unsigned total_fifo_words; int ret; |
5fd38677a spi: tegra20-slin... |
699 700 |
u32 command; u32 command2; |
dc4dc3605 spi: tegra: add s... |
701 |
|
e6811d1d7 spi: make sure al... |
702 |
bits_per_word = t->bits_per_word; |
beb96c2ad spi/tegra: remove... |
703 |
speed = t->speed_hz; |
dc4dc3605 spi: tegra: add s... |
704 705 706 707 708 709 710 711 712 713 714 |
if (speed != tspi->cur_speed) { clk_set_rate(tspi->clk, speed * 4); 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; total_fifo_words = tegra_slink_calculate_curr_xfer_param(spi, tspi, t); |
f178e3dec spi/tegra20-slink... |
715 716 717 |
command = tspi->command_reg; command &= ~SLINK_BIT_LENGTH(~0); command |= SLINK_BIT_LENGTH(bits_per_word - 1); |
dc4dc3605 spi: tegra: add s... |
718 |
|
f178e3dec spi/tegra20-slink... |
719 720 |
command2 = tspi->command2_reg; command2 &= ~(SLINK_RXEN | SLINK_TXEN); |
dc4dc3605 spi: tegra: add s... |
721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 |
tegra_slink_writel(tspi, command, SLINK_COMMAND); tspi->command_reg = command; tspi->cur_direction = 0; if (t->rx_buf) { command2 |= SLINK_RXEN; tspi->cur_direction |= DATA_DIR_RX; } if (t->tx_buf) { command2 |= SLINK_TXEN; tspi->cur_direction |= DATA_DIR_TX; } tegra_slink_writel(tspi, command2, SLINK_COMMAND2); tspi->command2_reg = command2; if (total_fifo_words > SLINK_FIFO_DEPTH) ret = tegra_slink_start_dma_based_transfer(tspi, t); else ret = tegra_slink_start_cpu_based_transfer(tspi, t); return ret; } static int tegra_slink_setup(struct spi_device *spi) { |
5fd38677a spi: tegra20-slin... |
746 |
static const u32 cs_pol_bit[MAX_CHIP_SELECT] = { |
dc4dc3605 spi: tegra: add s... |
747 748 749 750 751 |
SLINK_CS_POLARITY, SLINK_CS_POLARITY1, SLINK_CS_POLARITY2, SLINK_CS_POLARITY3, }; |
5fd38677a spi: tegra20-slin... |
752 753 754 755 |
struct tegra_slink_data *tspi = spi_master_get_devdata(spi->master); u32 val; unsigned long flags; int ret; |
dc4dc3605 spi: tegra: add s... |
756 757 758 759 760 761 |
dev_dbg(&spi->dev, "setup %d bpw, %scpol, %scpha, %dHz ", spi->bits_per_word, spi->mode & SPI_CPOL ? "" : "~", spi->mode & SPI_CPHA ? "" : "~", spi->max_speed_hz); |
dc4dc3605 spi: tegra: add s... |
762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 |
ret = pm_runtime_get_sync(tspi->dev); if (ret < 0) { dev_err(tspi->dev, "pm runtime failed, e = %d ", ret); return ret; } spin_lock_irqsave(&tspi->lock, flags); val = tspi->def_command_reg; if (spi->mode & SPI_CS_HIGH) val |= cs_pol_bit[spi->chip_select]; else val &= ~cs_pol_bit[spi->chip_select]; tspi->def_command_reg = val; tegra_slink_writel(tspi, tspi->def_command_reg, SLINK_COMMAND); spin_unlock_irqrestore(&tspi->lock, flags); pm_runtime_put(tspi->dev); return 0; } |
63fc184cd spi/tegra20-slink... |
782 783 |
static int tegra_slink_prepare_message(struct spi_master *master, struct spi_message *msg) |
dc4dc3605 spi: tegra: add s... |
784 |
{ |
dc4dc3605 spi: tegra: add s... |
785 |
struct tegra_slink_data *tspi = spi_master_get_devdata(master); |
dc4dc3605 spi: tegra: add s... |
786 |
struct spi_device *spi = msg->spi; |
dc4dc3605 spi: tegra: add s... |
787 |
|
f178e3dec spi/tegra20-slink... |
788 |
tegra_slink_clear_status(tspi); |
d558c4733 spi: slink-tegra2... |
789 |
|
f178e3dec spi/tegra20-slink... |
790 791 |
tspi->command_reg = tspi->def_command_reg; tspi->command_reg |= SLINK_CS_SW | SLINK_CS_VALUE; |
dc4dc3605 spi: tegra: add s... |
792 |
|
f178e3dec spi/tegra20-slink... |
793 794 795 796 797 798 799 800 801 802 803 |
tspi->command2_reg = tspi->def_command2_reg; tspi->command2_reg |= SLINK_SS_EN_CS(spi->chip_select); tspi->command_reg &= ~SLINK_MODES; if (spi->mode & SPI_CPHA) tspi->command_reg |= SLINK_CK_SDA; if (spi->mode & SPI_CPOL) tspi->command_reg |= SLINK_IDLE_SCLK_DRIVE_HIGH; else tspi->command_reg |= SLINK_IDLE_SCLK_DRIVE_LOW; |
d558c4733 spi: slink-tegra2... |
804 |
|
63fc184cd spi/tegra20-slink... |
805 806 |
return 0; } |
dc4dc3605 spi: tegra: add s... |
807 |
|
63fc184cd spi/tegra20-slink... |
808 809 810 811 812 813 |
static int tegra_slink_transfer_one(struct spi_master *master, struct spi_device *spi, struct spi_transfer *xfer) { struct tegra_slink_data *tspi = spi_master_get_devdata(master); int ret; |
16735d022 tree-wide: use re... |
814 |
reinit_completion(&tspi->xfer_completion); |
f178e3dec spi/tegra20-slink... |
815 |
ret = tegra_slink_start_transfer_one(spi, xfer); |
63fc184cd spi/tegra20-slink... |
816 817 818 819 820 |
if (ret < 0) { dev_err(tspi->dev, "spi can not start transfer, err %d ", ret); return ret; |
dc4dc3605 spi: tegra: add s... |
821 |
} |
f178e3dec spi/tegra20-slink... |
822 |
|
63fc184cd spi/tegra20-slink... |
823 824 825 826 |
ret = wait_for_completion_timeout(&tspi->xfer_completion, SLINK_DMA_TIMEOUT); if (WARN_ON(ret == 0)) { dev_err(tspi->dev, |
bfca76185 spi: tegra: fix s... |
827 828 |
"spi transfer timeout, err %d ", ret); |
63fc184cd spi/tegra20-slink... |
829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 |
return -EIO; } if (tspi->tx_status) return tspi->tx_status; if (tspi->rx_status) return tspi->rx_status; return 0; } static int tegra_slink_unprepare_message(struct spi_master *master, struct spi_message *msg) { struct tegra_slink_data *tspi = spi_master_get_devdata(master); |
dc4dc3605 spi: tegra: add s... |
844 845 |
tegra_slink_writel(tspi, tspi->def_command_reg, SLINK_COMMAND); tegra_slink_writel(tspi, tspi->def_command2_reg, SLINK_COMMAND2); |
63fc184cd spi/tegra20-slink... |
846 847 |
return 0; |
dc4dc3605 spi: tegra: add s... |
848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 |
} static irqreturn_t handle_cpu_based_xfer(struct tegra_slink_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 || (tspi->status_reg & SLINK_BSY)) { dev_err(tspi->dev, "CpuXfer ERROR bit set 0x%x ", tspi->status_reg); dev_err(tspi->dev, "CpuXfer 0x%08x:0x%08x:0x%08x ", tspi->command_reg, tspi->command2_reg, tspi->dma_control_reg); |
ff2251e3d spi: tegra: use r... |
865 |
reset_control_assert(tspi->rst); |
dc4dc3605 spi: tegra: add s... |
866 |
udelay(2); |
ff2251e3d spi: tegra: use r... |
867 |
reset_control_deassert(tspi->rst); |
dc4dc3605 spi: tegra: add s... |
868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 |
complete(&tspi->xfer_completion); goto exit; } if (tspi->cur_direction & DATA_DIR_RX) tegra_slink_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_slink_calculate_curr_xfer_param(tspi->cur_spi, tspi, t); tegra_slink_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_slink_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, SLINK_DMA_TIMEOUT); if (wait_status <= 0) { dmaengine_terminate_all(tspi->tx_dma_chan); dev_err(tspi->dev, "TxDma Xfer failed "); 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, SLINK_DMA_TIMEOUT); if (wait_status <= 0) { dmaengine_terminate_all(tspi->rx_dma_chan); dev_err(tspi->dev, "RxDma Xfer failed "); err += 2; } } } spin_lock_irqsave(&tspi->lock, flags); if (err) { dev_err(tspi->dev, "DmaXfer: ERROR bit set 0x%x ", tspi->status_reg); dev_err(tspi->dev, "DmaXfer 0x%08x:0x%08x:0x%08x ", tspi->command_reg, tspi->command2_reg, tspi->dma_control_reg); |
ff2251e3d spi: tegra: use r... |
942 |
reset_control_assert(tspi->rst); |
dc4dc3605 spi: tegra: add s... |
943 |
udelay(2); |
ff2251e3d spi: tegra: use r... |
944 |
reset_control_assert(tspi->rst); |
dc4dc3605 spi: tegra: add s... |
945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 |
complete(&tspi->xfer_completion); spin_unlock_irqrestore(&tspi->lock, flags); return IRQ_HANDLED; } if (tspi->cur_direction & DATA_DIR_RX) tegra_slink_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_slink_calculate_curr_xfer_param(tspi->cur_spi, tspi, t); if (total_fifo_words > SLINK_FIFO_DEPTH) err = tegra_slink_start_dma_based_transfer(tspi, t); else err = tegra_slink_start_cpu_based_transfer(tspi, t); exit: spin_unlock_irqrestore(&tspi->lock, flags); return IRQ_HANDLED; } static irqreturn_t tegra_slink_isr_thread(int irq, void *context_data) { struct tegra_slink_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_slink_isr(int irq, void *context_data) { struct tegra_slink_data *tspi = context_data; tspi->status_reg = tegra_slink_readl(tspi, SLINK_STATUS); if (tspi->cur_direction & DATA_DIR_TX) tspi->tx_status = tspi->status_reg & (SLINK_TX_OVF | SLINK_TX_UNF); if (tspi->cur_direction & DATA_DIR_RX) tspi->rx_status = tspi->status_reg & (SLINK_RX_OVF | SLINK_RX_UNF); tegra_slink_clear_status(tspi); return IRQ_WAKE_THREAD; } |
8b0bebe2c spi: tegra: slink... |
1001 |
static const struct tegra_slink_chip_data tegra30_spi_cdata = { |
dc4dc3605 spi: tegra: add s... |
1002 1003 |
.cs_hold_time = true, }; |
8b0bebe2c spi: tegra: slink... |
1004 |
static const struct tegra_slink_chip_data tegra20_spi_cdata = { |
dc4dc3605 spi: tegra: add s... |
1005 1006 |
.cs_hold_time = false, }; |
b2fb1872d spi: tegra20-slin... |
1007 |
static const struct of_device_id tegra_slink_of_match[] = { |
dc4dc3605 spi: tegra: add s... |
1008 |
{ .compatible = "nvidia,tegra30-slink", .data = &tegra30_spi_cdata, }, |
24bc89716 spi: tegra: seque... |
1009 |
{ .compatible = "nvidia,tegra20-slink", .data = &tegra20_spi_cdata, }, |
dc4dc3605 spi: tegra: add s... |
1010 1011 1012 |
{} }; MODULE_DEVICE_TABLE(of, tegra_slink_of_match); |
fd4a319bc spi: Remove HOTPL... |
1013 |
static int tegra_slink_probe(struct platform_device *pdev) |
dc4dc3605 spi: tegra: add s... |
1014 1015 1016 1017 |
{ struct spi_master *master; struct tegra_slink_data *tspi; struct resource *r; |
dc4dc3605 spi: tegra: add s... |
1018 1019 1020 |
int ret, spi_irq; const struct tegra_slink_chip_data *cdata = NULL; const struct of_device_id *match; |
c60fea021 spi/tegra-slink: ... |
1021 |
match = of_match_device(tegra_slink_of_match, &pdev->dev); |
dc4dc3605 spi: tegra: add s... |
1022 1023 1024 1025 1026 1027 |
if (!match) { dev_err(&pdev->dev, "Error: No device match found "); return -ENODEV; } cdata = match->data; |
dc4dc3605 spi: tegra: add s... |
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 |
master = spi_alloc_master(&pdev->dev, sizeof(*tspi)); if (!master) { dev_err(&pdev->dev, "master allocation failed "); return -ENOMEM; } /* the spi->mode bits understood by this driver: */ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; master->setup = tegra_slink_setup; |
63fc184cd spi/tegra20-slink... |
1039 1040 1041 |
master->prepare_message = tegra_slink_prepare_message; master->transfer_one = tegra_slink_transfer_one; master->unprepare_message = tegra_slink_unprepare_message; |
ce74ac80d spi/tegra20-slink... |
1042 |
master->auto_runtime_pm = true; |
dc4dc3605 spi: tegra: add s... |
1043 |
master->num_chipselect = MAX_CHIP_SELECT; |
dc4dc3605 spi: tegra: add s... |
1044 |
|
24b5a82cf spi: use platform... |
1045 |
platform_set_drvdata(pdev, master); |
dc4dc3605 spi: tegra: add s... |
1046 1047 |
tspi = spi_master_get_devdata(master); tspi->master = master; |
dc4dc3605 spi: tegra: add s... |
1048 1049 1050 |
tspi->dev = &pdev->dev; tspi->chip_data = cdata; spin_lock_init(&tspi->lock); |
3c604de49 spi: tegra20-slin... |
1051 1052 1053 |
if (of_property_read_u32(tspi->dev->of_node, "spi-max-frequency", &master->max_speed_hz)) master->max_speed_hz = 25000000; /* 25MHz */ |
c60fea021 spi/tegra-slink: ... |
1054 |
|
dc4dc3605 spi: tegra: add s... |
1055 1056 1057 1058 1059 1060 1061 1062 |
r = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!r) { dev_err(&pdev->dev, "No IO memory resource "); ret = -ENODEV; goto exit_free_master; } tspi->phys = r->start; |
b0ee56052 spi: Convert to d... |
1063 1064 1065 |
tspi->base = devm_ioremap_resource(&pdev->dev, r); if (IS_ERR(tspi->base)) { ret = PTR_ERR(tspi->base); |
dc4dc3605 spi: tegra: add s... |
1066 1067 |
goto exit_free_master; } |
429773341 spi: tegra20-slin... |
1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 |
/* disabled clock may cause interrupt storm upon request */ tspi->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(tspi->clk)) { ret = PTR_ERR(tspi->clk); dev_err(&pdev->dev, "Can not get clock %d ", ret); goto exit_free_master; } ret = clk_prepare(tspi->clk); if (ret < 0) { dev_err(&pdev->dev, "Clock prepare failed %d ", ret); goto exit_free_master; } ret = clk_enable(tspi->clk); if (ret < 0) { dev_err(&pdev->dev, "Clock enable failed %d ", ret); goto exit_free_master; } |
dc4dc3605 spi: tegra: add s... |
1088 1089 1090 1091 1092 1093 1094 1095 1096 |
spi_irq = platform_get_irq(pdev, 0); tspi->irq = spi_irq; ret = request_threaded_irq(tspi->irq, tegra_slink_isr, tegra_slink_isr_thread, IRQF_ONESHOT, dev_name(&pdev->dev), tspi); if (ret < 0) { dev_err(&pdev->dev, "Failed to register ISR for IRQ %d ", tspi->irq); |
429773341 spi: tegra20-slin... |
1097 |
goto exit_clk_disable; |
dc4dc3605 spi: tegra: add s... |
1098 |
} |
73b32756c spi: tegra20-slin... |
1099 |
tspi->rst = devm_reset_control_get_exclusive(&pdev->dev, "spi"); |
ff2251e3d spi: tegra: use r... |
1100 1101 1102 1103 1104 1105 |
if (IS_ERR(tspi->rst)) { dev_err(&pdev->dev, "can not get reset "); ret = PTR_ERR(tspi->rst); goto exit_free_irq; } |
dc4dc3605 spi: tegra: add s... |
1106 1107 |
tspi->max_buf_size = SLINK_FIFO_DEPTH << 2; tspi->dma_buf_size = DEFAULT_SPI_DMA_BUF_LEN; |
dc4dc3605 spi: tegra: add s... |
1108 |
|
a915d150f spi: tegra: conve... |
1109 1110 1111 1112 1113 1114 1115 1116 1117 |
ret = tegra_slink_init_dma_param(tspi, true); if (ret < 0) goto exit_free_irq; ret = tegra_slink_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); |
dc4dc3605 spi: tegra: add s... |
1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 |
init_completion(&tspi->xfer_completion); pm_runtime_enable(&pdev->dev); if (!pm_runtime_enabled(&pdev->dev)) { ret = tegra_slink_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 ", ret); goto exit_pm_disable; } tspi->def_command_reg = SLINK_M_S; tspi->def_command2_reg = SLINK_CS_ACTIVE_BETWEEN; tegra_slink_writel(tspi, tspi->def_command_reg, SLINK_COMMAND); tegra_slink_writel(tspi, tspi->def_command2_reg, SLINK_COMMAND2); pm_runtime_put(&pdev->dev); master->dev.of_node = pdev->dev.of_node; |
716db5d64 spi: tegra20-slin... |
1141 |
ret = devm_spi_register_master(&pdev->dev, master); |
dc4dc3605 spi: tegra: add s... |
1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 |
if (ret < 0) { dev_err(&pdev->dev, "can not register to master err %d ", ret); goto exit_pm_disable; } return ret; exit_pm_disable: pm_runtime_disable(&pdev->dev); if (!pm_runtime_status_suspended(&pdev->dev)) tegra_slink_runtime_suspend(&pdev->dev); tegra_slink_deinit_dma_param(tspi, false); exit_rx_dma_free: tegra_slink_deinit_dma_param(tspi, true); exit_free_irq: free_irq(spi_irq, tspi); |
429773341 spi: tegra20-slin... |
1158 1159 |
exit_clk_disable: clk_disable(tspi->clk); |
dc4dc3605 spi: tegra: add s... |
1160 1161 1162 1163 |
exit_free_master: spi_master_put(master); return ret; } |
fd4a319bc spi: Remove HOTPL... |
1164 |
static int tegra_slink_remove(struct platform_device *pdev) |
dc4dc3605 spi: tegra: add s... |
1165 |
{ |
24b5a82cf spi: use platform... |
1166 |
struct spi_master *master = platform_get_drvdata(pdev); |
dc4dc3605 spi: tegra: add s... |
1167 1168 1169 |
struct tegra_slink_data *tspi = spi_master_get_devdata(master); free_irq(tspi->irq, tspi); |
dc4dc3605 spi: tegra: add s... |
1170 |
|
429773341 spi: tegra20-slin... |
1171 |
clk_disable(tspi->clk); |
dc4dc3605 spi: tegra: add s... |
1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 |
if (tspi->tx_dma_chan) tegra_slink_deinit_dma_param(tspi, false); if (tspi->rx_dma_chan) tegra_slink_deinit_dma_param(tspi, true); pm_runtime_disable(&pdev->dev); if (!pm_runtime_status_suspended(&pdev->dev)) tegra_slink_runtime_suspend(&pdev->dev); return 0; } #ifdef CONFIG_PM_SLEEP static int tegra_slink_suspend(struct device *dev) { struct spi_master *master = dev_get_drvdata(dev); return spi_master_suspend(master); } static int tegra_slink_resume(struct device *dev) { struct spi_master *master = dev_get_drvdata(dev); struct tegra_slink_data *tspi = spi_master_get_devdata(master); int ret; ret = pm_runtime_get_sync(dev); if (ret < 0) { dev_err(dev, "pm runtime failed, e = %d ", ret); return ret; } tegra_slink_writel(tspi, tspi->command_reg, SLINK_COMMAND); tegra_slink_writel(tspi, tspi->command2_reg, SLINK_COMMAND2); pm_runtime_put(dev); return spi_master_resume(master); } #endif static int tegra_slink_runtime_suspend(struct device *dev) { struct spi_master *master = dev_get_drvdata(dev); struct tegra_slink_data *tspi = spi_master_get_devdata(master); /* Flush all write which are in PPSB queue by reading back */ tegra_slink_readl(tspi, SLINK_MAS_DATA); clk_disable_unprepare(tspi->clk); return 0; } static int tegra_slink_runtime_resume(struct device *dev) { struct spi_master *master = dev_get_drvdata(dev); struct tegra_slink_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 ", ret); return ret; } return 0; } static const struct dev_pm_ops slink_pm_ops = { SET_RUNTIME_PM_OPS(tegra_slink_runtime_suspend, tegra_slink_runtime_resume, NULL) SET_SYSTEM_SLEEP_PM_OPS(tegra_slink_suspend, tegra_slink_resume) }; static struct platform_driver tegra_slink_driver = { .driver = { .name = "spi-tegra-slink", |
dc4dc3605 spi: tegra: add s... |
1248 |
.pm = &slink_pm_ops, |
c60fea021 spi/tegra-slink: ... |
1249 |
.of_match_table = tegra_slink_of_match, |
dc4dc3605 spi: tegra: add s... |
1250 1251 |
}, .probe = tegra_slink_probe, |
fd4a319bc spi: Remove HOTPL... |
1252 |
.remove = tegra_slink_remove, |
dc4dc3605 spi: tegra: add s... |
1253 1254 1255 1256 1257 1258 1259 |
}; module_platform_driver(tegra_slink_driver); MODULE_ALIAS("platform:spi-tegra-slink"); MODULE_DESCRIPTION("NVIDIA Tegra20/Tegra30 SLINK Controller Driver"); MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); MODULE_LICENSE("GPL v2"); |