diff options
Diffstat (limited to 'drivers/net/caif/caif_spi_slave.c')
| -rw-r--r-- | drivers/net/caif/caif_spi_slave.c | 254 |
1 files changed, 0 insertions, 254 deletions
diff --git a/drivers/net/caif/caif_spi_slave.c b/drivers/net/caif/caif_spi_slave.c deleted file mode 100644 index bb776d33dd8f..000000000000 --- a/drivers/net/caif/caif_spi_slave.c +++ /dev/null @@ -1,254 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Copyright (C) ST-Ericsson AB 2010 - * Author: Daniel Martensson - */ -#include <linux/module.h> -#include <linux/device.h> -#include <linux/platform_device.h> -#include <linux/string.h> -#include <linux/semaphore.h> -#include <linux/workqueue.h> -#include <linux/completion.h> -#include <linux/list.h> -#include <linux/interrupt.h> -#include <linux/dma-mapping.h> -#include <linux/delay.h> -#include <linux/sched.h> -#include <linux/debugfs.h> -#include <net/caif/caif_spi.h> - -#ifndef CONFIG_CAIF_SPI_SYNC -#define SPI_DATA_POS 0 -static inline int forward_to_spi_cmd(struct cfspi *cfspi) -{ - return cfspi->rx_cpck_len; -} -#else -#define SPI_DATA_POS SPI_CMD_SZ -static inline int forward_to_spi_cmd(struct cfspi *cfspi) -{ - return 0; -} -#endif - -int spi_frm_align = 2; - -/* - * SPI padding options. - * Warning: must be a base of 2 (& operation used) and can not be zero ! - */ -int spi_up_head_align = 1 << 1; -int spi_up_tail_align = 1 << 0; -int spi_down_head_align = 1 << 2; -int spi_down_tail_align = 1 << 1; - -#ifdef CONFIG_DEBUG_FS -static inline void debugfs_store_prev(struct cfspi *cfspi) -{ - /* Store previous command for debugging reasons.*/ - cfspi->pcmd = cfspi->cmd; - /* Store previous transfer. */ - cfspi->tx_ppck_len = cfspi->tx_cpck_len; - cfspi->rx_ppck_len = cfspi->rx_cpck_len; -} -#else -static inline void debugfs_store_prev(struct cfspi *cfspi) -{ -} -#endif - -void cfspi_xfer(struct work_struct *work) -{ - struct cfspi *cfspi; - u8 *ptr = NULL; - unsigned long flags; - int ret; - cfspi = container_of(work, struct cfspi, work); - - /* Initialize state. */ - cfspi->cmd = SPI_CMD_EOT; - - for (;;) { - - cfspi_dbg_state(cfspi, CFSPI_STATE_WAITING); - - /* Wait for master talk or transmit event. */ - wait_event_interruptible(cfspi->wait, - test_bit(SPI_XFER, &cfspi->state) || - test_bit(SPI_TERMINATE, &cfspi->state)); - - if (test_bit(SPI_TERMINATE, &cfspi->state)) - return; - -#if CFSPI_DBG_PREFILL - /* Prefill buffers for easier debugging. */ - memset(cfspi->xfer.va_tx, 0xFF, SPI_DMA_BUF_LEN); - memset(cfspi->xfer.va_rx, 0xFF, SPI_DMA_BUF_LEN); -#endif /* CFSPI_DBG_PREFILL */ - - cfspi_dbg_state(cfspi, CFSPI_STATE_AWAKE); - - /* Check whether we have a committed frame. */ - if (cfspi->tx_cpck_len) { - int len; - - cfspi_dbg_state(cfspi, CFSPI_STATE_FETCH_PKT); - - /* Copy committed SPI frames after the SPI indication. */ - ptr = (u8 *) cfspi->xfer.va_tx; - ptr += SPI_IND_SZ; - len = cfspi_xmitfrm(cfspi, ptr, cfspi->tx_cpck_len); - WARN_ON(len != cfspi->tx_cpck_len); - } - - cfspi_dbg_state(cfspi, CFSPI_STATE_GET_NEXT); - - /* Get length of next frame to commit. */ - cfspi->tx_npck_len = cfspi_xmitlen(cfspi); - - WARN_ON(cfspi->tx_npck_len > SPI_DMA_BUF_LEN); - - /* - * Add indication and length at the beginning of the frame, - * using little endian. - */ - ptr = (u8 *) cfspi->xfer.va_tx; - *ptr++ = SPI_CMD_IND; - *ptr++ = (SPI_CMD_IND & 0xFF00) >> 8; - *ptr++ = cfspi->tx_npck_len & 0x00FF; - *ptr++ = (cfspi->tx_npck_len & 0xFF00) >> 8; - - /* Calculate length of DMAs. */ - cfspi->xfer.tx_dma_len = cfspi->tx_cpck_len + SPI_IND_SZ; - cfspi->xfer.rx_dma_len = cfspi->rx_cpck_len + SPI_CMD_SZ; - - /* Add SPI TX frame alignment padding, if necessary. */ - if (cfspi->tx_cpck_len && - (cfspi->xfer.tx_dma_len % spi_frm_align)) { - - cfspi->xfer.tx_dma_len += spi_frm_align - - (cfspi->xfer.tx_dma_len % spi_frm_align); - } - - /* Add SPI RX frame alignment padding, if necessary. */ - if (cfspi->rx_cpck_len && - (cfspi->xfer.rx_dma_len % spi_frm_align)) { - - cfspi->xfer.rx_dma_len += spi_frm_align - - (cfspi->xfer.rx_dma_len % spi_frm_align); - } - - cfspi_dbg_state(cfspi, CFSPI_STATE_INIT_XFER); - - /* Start transfer. */ - ret = cfspi->dev->init_xfer(&cfspi->xfer, cfspi->dev); - WARN_ON(ret); - - cfspi_dbg_state(cfspi, CFSPI_STATE_WAIT_ACTIVE); - - /* - * TODO: We might be able to make an assumption if this is the - * first loop. Make sure that minimum toggle time is respected. - */ - udelay(MIN_TRANSITION_TIME_USEC); - - cfspi_dbg_state(cfspi, CFSPI_STATE_SIG_ACTIVE); - - /* Signal that we are ready to receive data. */ - cfspi->dev->sig_xfer(true, cfspi->dev); - - cfspi_dbg_state(cfspi, CFSPI_STATE_WAIT_XFER_DONE); - - /* Wait for transfer completion. */ - wait_for_completion(&cfspi->comp); - - cfspi_dbg_state(cfspi, CFSPI_STATE_XFER_DONE); - - if (cfspi->cmd == SPI_CMD_EOT) { - /* - * Clear the master talk bit. A xfer is always at - * least two bursts. - */ - clear_bit(SPI_SS_ON, &cfspi->state); - } - - cfspi_dbg_state(cfspi, CFSPI_STATE_WAIT_INACTIVE); - - /* Make sure that the minimum toggle time is respected. */ - if (SPI_XFER_TIME_USEC(cfspi->xfer.tx_dma_len, - cfspi->dev->clk_mhz) < - MIN_TRANSITION_TIME_USEC) { - - udelay(MIN_TRANSITION_TIME_USEC - - SPI_XFER_TIME_USEC - (cfspi->xfer.tx_dma_len, cfspi->dev->clk_mhz)); - } - - cfspi_dbg_state(cfspi, CFSPI_STATE_SIG_INACTIVE); - - /* De-assert transfer signal. */ - cfspi->dev->sig_xfer(false, cfspi->dev); - - /* Check whether we received a CAIF packet. */ - if (cfspi->rx_cpck_len) { - int len; - - cfspi_dbg_state(cfspi, CFSPI_STATE_DELIVER_PKT); - - /* Parse SPI frame. */ - ptr = ((u8 *)(cfspi->xfer.va_rx + SPI_DATA_POS)); - - len = cfspi_rxfrm(cfspi, ptr, cfspi->rx_cpck_len); - WARN_ON(len != cfspi->rx_cpck_len); - } - - /* Check the next SPI command and length. */ - ptr = (u8 *) cfspi->xfer.va_rx; - - ptr += forward_to_spi_cmd(cfspi); - - cfspi->cmd = *ptr++; - cfspi->cmd |= ((*ptr++) << 8) & 0xFF00; - cfspi->rx_npck_len = *ptr++; - cfspi->rx_npck_len |= ((*ptr++) << 8) & 0xFF00; - - WARN_ON(cfspi->rx_npck_len > SPI_DMA_BUF_LEN); - WARN_ON(cfspi->cmd > SPI_CMD_EOT); - - debugfs_store_prev(cfspi); - - /* Check whether the master issued an EOT command. */ - if (cfspi->cmd == SPI_CMD_EOT) { - /* Reset state. */ - cfspi->tx_cpck_len = 0; - cfspi->rx_cpck_len = 0; - } else { - /* Update state. */ - cfspi->tx_cpck_len = cfspi->tx_npck_len; - cfspi->rx_cpck_len = cfspi->rx_npck_len; - } - - /* - * Check whether we need to clear the xfer bit. - * Spin lock needed for packet insertion. - * Test and clear of different bits - * are not supported. - */ - spin_lock_irqsave(&cfspi->lock, flags); - if (cfspi->cmd == SPI_CMD_EOT && !cfspi_xmitlen(cfspi) - && !test_bit(SPI_SS_ON, &cfspi->state)) - clear_bit(SPI_XFER, &cfspi->state); - - spin_unlock_irqrestore(&cfspi->lock, flags); - } -} - -struct platform_driver cfspi_spi_driver = { - .probe = cfspi_spi_probe, - .remove = cfspi_spi_remove, - .driver = { - .name = "cfspi_sspi", - .owner = THIS_MODULE, - }, -}; |