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![Amit Kumar Mahapatra via Alsa-devel](/assets/img/avatar_default.png)
Supporting multi-cs in spi drivers would require the chip_select & cs_gpiod members of struct spi_device to be an array. But changing the type of these members to array would break the spi driver functionality. To make the transition smoother introduced four new APIs to get/set the spi->chip_select & spi->cs_gpiod and replaced all spi->chip_select and spi->cs_gpiod references with get or set API calls. While adding multi-cs support in further patches the chip_select & cs_gpiod members of the spi_device structure would be converted to arrays & the "idx" parameter of the APIs would be used as array index i.e., spi->chip_select[idx] & spi->cs_gpiod[idx] respectively. Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@amd.com> Acked-by: Heiko Stuebner <heiko@sntech.de> # Rockchip drivers Reviewed-by: Michal Simek <michal.simek@amd.com> Reviewed-by: Cédric Le Goater <clg@kaod.org> # Aspeed driver Reviewed-by: Dhruva Gole <d-gole@ti.com> # SPI Cadence QSPI Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com> # spi-stm32-qspi Acked-by: William Zhang <william.zhang@broadcom.com> # bcm63xx-hsspi driver Reviewed-by: Serge Semin <fancer.lancer@gmail.com> # DW SSI part Link: https://lore.kernel.org/r/167847070432.26.15076794204368669839@mailman-core.alsa-project.org Signed-off-by: Mark Brown <broonie@kernel.org>
548 lines
14 KiB
C
548 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* MPC52xx SPI bus driver.
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*
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* Copyright (C) 2008 Secret Lab Technologies Ltd.
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*
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* This is the driver for the MPC5200's dedicated SPI controller.
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*
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* Note: this driver does not support the MPC5200 PSC in SPI mode. For
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* that driver see drivers/spi/mpc52xx_psc_spi.c
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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/of_platform.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <linux/spi/spi.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <asm/time.h>
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#include <asm/mpc52xx.h>
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MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
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MODULE_DESCRIPTION("MPC52xx SPI (non-PSC) Driver");
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MODULE_LICENSE("GPL");
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/* Register offsets */
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#define SPI_CTRL1 0x00
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#define SPI_CTRL1_SPIE (1 << 7)
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#define SPI_CTRL1_SPE (1 << 6)
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#define SPI_CTRL1_MSTR (1 << 4)
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#define SPI_CTRL1_CPOL (1 << 3)
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#define SPI_CTRL1_CPHA (1 << 2)
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#define SPI_CTRL1_SSOE (1 << 1)
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#define SPI_CTRL1_LSBFE (1 << 0)
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#define SPI_CTRL2 0x01
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#define SPI_BRR 0x04
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#define SPI_STATUS 0x05
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#define SPI_STATUS_SPIF (1 << 7)
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#define SPI_STATUS_WCOL (1 << 6)
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#define SPI_STATUS_MODF (1 << 4)
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#define SPI_DATA 0x09
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#define SPI_PORTDATA 0x0d
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#define SPI_DATADIR 0x10
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/* FSM state return values */
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#define FSM_STOP 0 /* Nothing more for the state machine to */
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/* do. If something interesting happens */
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/* then an IRQ will be received */
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#define FSM_POLL 1 /* need to poll for completion, an IRQ is */
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/* not expected */
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#define FSM_CONTINUE 2 /* Keep iterating the state machine */
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/* Driver internal data */
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struct mpc52xx_spi {
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struct spi_master *master;
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void __iomem *regs;
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int irq0; /* MODF irq */
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int irq1; /* SPIF irq */
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unsigned int ipb_freq;
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/* Statistics; not used now, but will be reintroduced for debugfs */
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int msg_count;
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int wcol_count;
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int wcol_ticks;
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u32 wcol_tx_timestamp;
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int modf_count;
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int byte_count;
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struct list_head queue; /* queue of pending messages */
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spinlock_t lock;
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struct work_struct work;
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/* Details of current transfer (length, and buffer pointers) */
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struct spi_message *message; /* current message */
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struct spi_transfer *transfer; /* current transfer */
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int (*state)(int irq, struct mpc52xx_spi *ms, u8 status, u8 data);
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int len;
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int timestamp;
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u8 *rx_buf;
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const u8 *tx_buf;
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int cs_change;
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int gpio_cs_count;
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struct gpio_desc **gpio_cs;
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};
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/*
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* CS control function
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*/
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static void mpc52xx_spi_chipsel(struct mpc52xx_spi *ms, int value)
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{
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int cs;
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if (ms->gpio_cs_count > 0) {
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cs = spi_get_chipselect(ms->message->spi, 0);
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gpiod_set_value(ms->gpio_cs[cs], value);
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} else {
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out_8(ms->regs + SPI_PORTDATA, value ? 0 : 0x08);
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}
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}
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/*
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* Start a new transfer. This is called both by the idle state
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* for the first transfer in a message, and by the wait state when the
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* previous transfer in a message is complete.
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*/
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static void mpc52xx_spi_start_transfer(struct mpc52xx_spi *ms)
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{
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ms->rx_buf = ms->transfer->rx_buf;
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ms->tx_buf = ms->transfer->tx_buf;
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ms->len = ms->transfer->len;
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/* Activate the chip select */
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if (ms->cs_change)
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mpc52xx_spi_chipsel(ms, 1);
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ms->cs_change = ms->transfer->cs_change;
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/* Write out the first byte */
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ms->wcol_tx_timestamp = mftb();
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if (ms->tx_buf)
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out_8(ms->regs + SPI_DATA, *ms->tx_buf++);
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else
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out_8(ms->regs + SPI_DATA, 0);
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}
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/* Forward declaration of state handlers */
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static int mpc52xx_spi_fsmstate_transfer(int irq, struct mpc52xx_spi *ms,
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u8 status, u8 data);
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static int mpc52xx_spi_fsmstate_wait(int irq, struct mpc52xx_spi *ms,
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u8 status, u8 data);
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/*
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* IDLE state
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*
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* No transfers are in progress; if another transfer is pending then retrieve
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* it and kick it off. Otherwise, stop processing the state machine
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*/
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static int
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mpc52xx_spi_fsmstate_idle(int irq, struct mpc52xx_spi *ms, u8 status, u8 data)
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{
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struct spi_device *spi;
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int spr, sppr;
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u8 ctrl1;
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if (status && irq)
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dev_err(&ms->master->dev, "spurious irq, status=0x%.2x\n",
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status);
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/* Check if there is another transfer waiting. */
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if (list_empty(&ms->queue))
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return FSM_STOP;
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/* get the head of the queue */
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ms->message = list_first_entry(&ms->queue, struct spi_message, queue);
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list_del_init(&ms->message->queue);
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/* Setup the controller parameters */
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ctrl1 = SPI_CTRL1_SPIE | SPI_CTRL1_SPE | SPI_CTRL1_MSTR;
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spi = ms->message->spi;
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if (spi->mode & SPI_CPHA)
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ctrl1 |= SPI_CTRL1_CPHA;
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if (spi->mode & SPI_CPOL)
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ctrl1 |= SPI_CTRL1_CPOL;
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if (spi->mode & SPI_LSB_FIRST)
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ctrl1 |= SPI_CTRL1_LSBFE;
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out_8(ms->regs + SPI_CTRL1, ctrl1);
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/* Setup the controller speed */
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/* minimum divider is '2'. Also, add '1' to force rounding the
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* divider up. */
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sppr = ((ms->ipb_freq / ms->message->spi->max_speed_hz) + 1) >> 1;
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spr = 0;
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if (sppr < 1)
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sppr = 1;
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while (((sppr - 1) & ~0x7) != 0) {
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sppr = (sppr + 1) >> 1; /* add '1' to force rounding up */
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spr++;
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}
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sppr--; /* sppr quantity in register is offset by 1 */
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if (spr > 7) {
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/* Don't overrun limits of SPI baudrate register */
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spr = 7;
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sppr = 7;
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}
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out_8(ms->regs + SPI_BRR, sppr << 4 | spr); /* Set speed */
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ms->cs_change = 1;
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ms->transfer = container_of(ms->message->transfers.next,
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struct spi_transfer, transfer_list);
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mpc52xx_spi_start_transfer(ms);
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ms->state = mpc52xx_spi_fsmstate_transfer;
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return FSM_CONTINUE;
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}
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/*
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* TRANSFER state
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*
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* In the middle of a transfer. If the SPI core has completed processing
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* a byte, then read out the received data and write out the next byte
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* (unless this transfer is finished; in which case go on to the wait
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* state)
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*/
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static int mpc52xx_spi_fsmstate_transfer(int irq, struct mpc52xx_spi *ms,
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u8 status, u8 data)
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{
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if (!status)
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return ms->irq0 ? FSM_STOP : FSM_POLL;
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if (status & SPI_STATUS_WCOL) {
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/* The SPI controller is stoopid. At slower speeds, it may
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* raise the SPIF flag before the state machine is actually
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* finished, which causes a collision (internal to the state
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* machine only). The manual recommends inserting a delay
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* between receiving the interrupt and sending the next byte,
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* but it can also be worked around simply by retrying the
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* transfer which is what we do here. */
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ms->wcol_count++;
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ms->wcol_ticks += mftb() - ms->wcol_tx_timestamp;
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ms->wcol_tx_timestamp = mftb();
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data = 0;
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if (ms->tx_buf)
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data = *(ms->tx_buf - 1);
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out_8(ms->regs + SPI_DATA, data); /* try again */
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return FSM_CONTINUE;
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} else if (status & SPI_STATUS_MODF) {
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ms->modf_count++;
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dev_err(&ms->master->dev, "mode fault\n");
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mpc52xx_spi_chipsel(ms, 0);
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ms->message->status = -EIO;
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if (ms->message->complete)
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ms->message->complete(ms->message->context);
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ms->state = mpc52xx_spi_fsmstate_idle;
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return FSM_CONTINUE;
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}
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/* Read data out of the spi device */
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ms->byte_count++;
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if (ms->rx_buf)
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*ms->rx_buf++ = data;
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/* Is the transfer complete? */
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ms->len--;
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if (ms->len == 0) {
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ms->timestamp = mftb();
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if (ms->transfer->delay.unit == SPI_DELAY_UNIT_USECS)
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ms->timestamp += ms->transfer->delay.value *
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tb_ticks_per_usec;
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ms->state = mpc52xx_spi_fsmstate_wait;
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return FSM_CONTINUE;
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}
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/* Write out the next byte */
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ms->wcol_tx_timestamp = mftb();
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if (ms->tx_buf)
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out_8(ms->regs + SPI_DATA, *ms->tx_buf++);
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else
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out_8(ms->regs + SPI_DATA, 0);
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return FSM_CONTINUE;
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}
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/*
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* WAIT state
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*
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* A transfer has completed; need to wait for the delay period to complete
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* before starting the next transfer
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*/
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static int
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mpc52xx_spi_fsmstate_wait(int irq, struct mpc52xx_spi *ms, u8 status, u8 data)
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{
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if (status && irq)
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dev_err(&ms->master->dev, "spurious irq, status=0x%.2x\n",
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status);
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if (((int)mftb()) - ms->timestamp < 0)
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return FSM_POLL;
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ms->message->actual_length += ms->transfer->len;
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/* Check if there is another transfer in this message. If there
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* aren't then deactivate CS, notify sender, and drop back to idle
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* to start the next message. */
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if (ms->transfer->transfer_list.next == &ms->message->transfers) {
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ms->msg_count++;
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mpc52xx_spi_chipsel(ms, 0);
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ms->message->status = 0;
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if (ms->message->complete)
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ms->message->complete(ms->message->context);
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ms->state = mpc52xx_spi_fsmstate_idle;
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return FSM_CONTINUE;
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}
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/* There is another transfer; kick it off */
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if (ms->cs_change)
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mpc52xx_spi_chipsel(ms, 0);
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ms->transfer = container_of(ms->transfer->transfer_list.next,
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struct spi_transfer, transfer_list);
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mpc52xx_spi_start_transfer(ms);
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ms->state = mpc52xx_spi_fsmstate_transfer;
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return FSM_CONTINUE;
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}
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/**
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* mpc52xx_spi_fsm_process - Finite State Machine iteration function
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* @irq: irq number that triggered the FSM or 0 for polling
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* @ms: pointer to mpc52xx_spi driver data
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*/
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static void mpc52xx_spi_fsm_process(int irq, struct mpc52xx_spi *ms)
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{
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int rc = FSM_CONTINUE;
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u8 status, data;
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while (rc == FSM_CONTINUE) {
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/* Interrupt cleared by read of STATUS followed by
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* read of DATA registers */
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status = in_8(ms->regs + SPI_STATUS);
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data = in_8(ms->regs + SPI_DATA);
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rc = ms->state(irq, ms, status, data);
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}
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if (rc == FSM_POLL)
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schedule_work(&ms->work);
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}
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/**
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* mpc52xx_spi_irq - IRQ handler
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*/
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static irqreturn_t mpc52xx_spi_irq(int irq, void *_ms)
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{
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struct mpc52xx_spi *ms = _ms;
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spin_lock(&ms->lock);
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mpc52xx_spi_fsm_process(irq, ms);
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spin_unlock(&ms->lock);
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return IRQ_HANDLED;
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}
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/**
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* mpc52xx_spi_wq - Workqueue function for polling the state machine
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*/
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static void mpc52xx_spi_wq(struct work_struct *work)
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{
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struct mpc52xx_spi *ms = container_of(work, struct mpc52xx_spi, work);
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unsigned long flags;
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spin_lock_irqsave(&ms->lock, flags);
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mpc52xx_spi_fsm_process(0, ms);
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spin_unlock_irqrestore(&ms->lock, flags);
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}
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/*
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* spi_master ops
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*/
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static int mpc52xx_spi_transfer(struct spi_device *spi, struct spi_message *m)
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{
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struct mpc52xx_spi *ms = spi_master_get_devdata(spi->master);
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unsigned long flags;
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m->actual_length = 0;
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m->status = -EINPROGRESS;
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spin_lock_irqsave(&ms->lock, flags);
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list_add_tail(&m->queue, &ms->queue);
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spin_unlock_irqrestore(&ms->lock, flags);
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schedule_work(&ms->work);
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return 0;
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}
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/*
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* OF Platform Bus Binding
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*/
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static int mpc52xx_spi_probe(struct platform_device *op)
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{
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struct spi_master *master;
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struct mpc52xx_spi *ms;
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struct gpio_desc *gpio_cs;
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void __iomem *regs;
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u8 ctrl1;
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int rc, i = 0;
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/* MMIO registers */
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dev_dbg(&op->dev, "probing mpc5200 SPI device\n");
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regs = of_iomap(op->dev.of_node, 0);
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if (!regs)
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return -ENODEV;
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/* initialize the device */
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ctrl1 = SPI_CTRL1_SPIE | SPI_CTRL1_SPE | SPI_CTRL1_MSTR;
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out_8(regs + SPI_CTRL1, ctrl1);
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out_8(regs + SPI_CTRL2, 0x0);
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out_8(regs + SPI_DATADIR, 0xe); /* Set output pins */
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out_8(regs + SPI_PORTDATA, 0x8); /* Deassert /SS signal */
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/* Clear the status register and re-read it to check for a MODF
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* failure. This driver cannot currently handle multiple masters
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* on the SPI bus. This fault will also occur if the SPI signals
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* are not connected to any pins (port_config setting) */
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in_8(regs + SPI_STATUS);
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out_8(regs + SPI_CTRL1, ctrl1);
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in_8(regs + SPI_DATA);
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if (in_8(regs + SPI_STATUS) & SPI_STATUS_MODF) {
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dev_err(&op->dev, "mode fault; is port_config correct?\n");
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rc = -EIO;
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goto err_init;
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}
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dev_dbg(&op->dev, "allocating spi_master struct\n");
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master = spi_alloc_master(&op->dev, sizeof(*ms));
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if (!master) {
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rc = -ENOMEM;
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goto err_alloc;
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}
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master->transfer = mpc52xx_spi_transfer;
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master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST;
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master->bits_per_word_mask = SPI_BPW_MASK(8);
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master->dev.of_node = op->dev.of_node;
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platform_set_drvdata(op, master);
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ms = spi_master_get_devdata(master);
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ms->master = master;
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ms->regs = regs;
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ms->irq0 = irq_of_parse_and_map(op->dev.of_node, 0);
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ms->irq1 = irq_of_parse_and_map(op->dev.of_node, 1);
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ms->state = mpc52xx_spi_fsmstate_idle;
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ms->ipb_freq = mpc5xxx_get_bus_frequency(&op->dev);
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ms->gpio_cs_count = gpiod_count(&op->dev, NULL);
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if (ms->gpio_cs_count > 0) {
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master->num_chipselect = ms->gpio_cs_count;
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ms->gpio_cs = kmalloc_array(ms->gpio_cs_count,
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sizeof(*ms->gpio_cs),
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GFP_KERNEL);
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if (!ms->gpio_cs) {
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rc = -ENOMEM;
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goto err_alloc_gpio;
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}
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for (i = 0; i < ms->gpio_cs_count; i++) {
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gpio_cs = gpiod_get_index(&op->dev,
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NULL, i, GPIOD_OUT_LOW);
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rc = PTR_ERR_OR_ZERO(gpio_cs);
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if (rc) {
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|
dev_err(&op->dev,
|
|
"failed to get spi cs gpio #%d: %d\n",
|
|
i, rc);
|
|
goto err_gpio;
|
|
}
|
|
|
|
ms->gpio_cs[i] = gpio_cs;
|
|
}
|
|
}
|
|
|
|
spin_lock_init(&ms->lock);
|
|
INIT_LIST_HEAD(&ms->queue);
|
|
INIT_WORK(&ms->work, mpc52xx_spi_wq);
|
|
|
|
/* Decide if interrupts can be used */
|
|
if (ms->irq0 && ms->irq1) {
|
|
rc = request_irq(ms->irq0, mpc52xx_spi_irq, 0,
|
|
"mpc5200-spi-modf", ms);
|
|
rc |= request_irq(ms->irq1, mpc52xx_spi_irq, 0,
|
|
"mpc5200-spi-spif", ms);
|
|
if (rc) {
|
|
free_irq(ms->irq0, ms);
|
|
free_irq(ms->irq1, ms);
|
|
ms->irq0 = ms->irq1 = 0;
|
|
}
|
|
} else {
|
|
/* operate in polled mode */
|
|
ms->irq0 = ms->irq1 = 0;
|
|
}
|
|
|
|
if (!ms->irq0)
|
|
dev_info(&op->dev, "using polled mode\n");
|
|
|
|
dev_dbg(&op->dev, "registering spi_master struct\n");
|
|
rc = spi_register_master(master);
|
|
if (rc)
|
|
goto err_register;
|
|
|
|
dev_info(&ms->master->dev, "registered MPC5200 SPI bus\n");
|
|
|
|
return rc;
|
|
|
|
err_register:
|
|
dev_err(&ms->master->dev, "initialization failed\n");
|
|
err_gpio:
|
|
while (i-- > 0)
|
|
gpiod_put(ms->gpio_cs[i]);
|
|
|
|
kfree(ms->gpio_cs);
|
|
err_alloc_gpio:
|
|
spi_master_put(master);
|
|
err_alloc:
|
|
err_init:
|
|
iounmap(regs);
|
|
return rc;
|
|
}
|
|
|
|
static void mpc52xx_spi_remove(struct platform_device *op)
|
|
{
|
|
struct spi_master *master = spi_master_get(platform_get_drvdata(op));
|
|
struct mpc52xx_spi *ms = spi_master_get_devdata(master);
|
|
int i;
|
|
|
|
free_irq(ms->irq0, ms);
|
|
free_irq(ms->irq1, ms);
|
|
|
|
for (i = 0; i < ms->gpio_cs_count; i++)
|
|
gpiod_put(ms->gpio_cs[i]);
|
|
|
|
kfree(ms->gpio_cs);
|
|
spi_unregister_master(master);
|
|
iounmap(ms->regs);
|
|
spi_master_put(master);
|
|
}
|
|
|
|
static const struct of_device_id mpc52xx_spi_match[] = {
|
|
{ .compatible = "fsl,mpc5200-spi", },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, mpc52xx_spi_match);
|
|
|
|
static struct platform_driver mpc52xx_spi_of_driver = {
|
|
.driver = {
|
|
.name = "mpc52xx-spi",
|
|
.of_match_table = mpc52xx_spi_match,
|
|
},
|
|
.probe = mpc52xx_spi_probe,
|
|
.remove_new = mpc52xx_spi_remove,
|
|
};
|
|
module_platform_driver(mpc52xx_spi_of_driver);
|