diff options
Diffstat (limited to 'drivers/spi/spi-synquacer.c')
| -rw-r--r-- | drivers/spi/spi-synquacer.c | 822 |
1 files changed, 822 insertions, 0 deletions
diff --git a/drivers/spi/spi-synquacer.c b/drivers/spi/spi-synquacer.c new file mode 100644 index 000000000000..c8c8d9cdd4b3 --- /dev/null +++ b/drivers/spi/spi-synquacer.c @@ -0,0 +1,822 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Synquacer HSSPI controller driver +// +// Copyright (c) 2015-2018 Socionext Inc. +// Copyright (c) 2018-2019 Linaro Ltd. +// + +#include <linux/acpi.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/scatterlist.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> +#include <linux/spinlock.h> +#include <linux/clk.h> + +/* HSSPI register address definitions */ +#define SYNQUACER_HSSPI_REG_MCTRL 0x00 +#define SYNQUACER_HSSPI_REG_PCC0 0x04 +#define SYNQUACER_HSSPI_REG_PCC(n) (SYNQUACER_HSSPI_REG_PCC0 + (n) * 4) +#define SYNQUACER_HSSPI_REG_TXF 0x14 +#define SYNQUACER_HSSPI_REG_TXE 0x18 +#define SYNQUACER_HSSPI_REG_TXC 0x1C +#define SYNQUACER_HSSPI_REG_RXF 0x20 +#define SYNQUACER_HSSPI_REG_RXE 0x24 +#define SYNQUACER_HSSPI_REG_RXC 0x28 +#define SYNQUACER_HSSPI_REG_FAULTF 0x2C +#define SYNQUACER_HSSPI_REG_FAULTC 0x30 +#define SYNQUACER_HSSPI_REG_DMCFG 0x34 +#define SYNQUACER_HSSPI_REG_DMSTART 0x38 +#define SYNQUACER_HSSPI_REG_DMBCC 0x3C +#define SYNQUACER_HSSPI_REG_DMSTATUS 0x40 +#define SYNQUACER_HSSPI_REG_FIFOCFG 0x4C +#define SYNQUACER_HSSPI_REG_TX_FIFO 0x50 +#define SYNQUACER_HSSPI_REG_RX_FIFO 0x90 +#define SYNQUACER_HSSPI_REG_MID 0xFC + +/* HSSPI register bit definitions */ +#define SYNQUACER_HSSPI_MCTRL_MEN BIT(0) +#define SYNQUACER_HSSPI_MCTRL_COMMAND_SEQUENCE_EN BIT(1) +#define SYNQUACER_HSSPI_MCTRL_CDSS BIT(3) +#define SYNQUACER_HSSPI_MCTRL_MES BIT(4) +#define SYNQUACER_HSSPI_MCTRL_SYNCON BIT(5) + +#define SYNQUACER_HSSPI_PCC_CPHA BIT(0) +#define SYNQUACER_HSSPI_PCC_CPOL BIT(1) +#define SYNQUACER_HSSPI_PCC_ACES BIT(2) +#define SYNQUACER_HSSPI_PCC_RTM BIT(3) +#define SYNQUACER_HSSPI_PCC_SSPOL BIT(4) +#define SYNQUACER_HSSPI_PCC_SDIR BIT(7) +#define SYNQUACER_HSSPI_PCC_SENDIAN BIT(8) +#define SYNQUACER_HSSPI_PCC_SAFESYNC BIT(16) +#define SYNQUACER_HSSPI_PCC_SS2CD_SHIFT 5U +#define SYNQUACER_HSSPI_PCC_CDRS_MASK 0x7f +#define SYNQUACER_HSSPI_PCC_CDRS_SHIFT 9U + +#define SYNQUACER_HSSPI_TXF_FIFO_FULL BIT(0) +#define SYNQUACER_HSSPI_TXF_FIFO_EMPTY BIT(1) +#define SYNQUACER_HSSPI_TXF_SLAVE_RELEASED BIT(6) + +#define SYNQUACER_HSSPI_TXE_FIFO_FULL BIT(0) +#define SYNQUACER_HSSPI_TXE_FIFO_EMPTY BIT(1) +#define SYNQUACER_HSSPI_TXE_SLAVE_RELEASED BIT(6) + +#define SYNQUACER_HSSPI_RXF_FIFO_MORE_THAN_THRESHOLD BIT(5) +#define SYNQUACER_HSSPI_RXF_SLAVE_RELEASED BIT(6) + +#define SYNQUACER_HSSPI_RXE_FIFO_MORE_THAN_THRESHOLD BIT(5) +#define SYNQUACER_HSSPI_RXE_SLAVE_RELEASED BIT(6) + +#define SYNQUACER_HSSPI_DMCFG_SSDC BIT(1) +#define SYNQUACER_HSSPI_DMCFG_MSTARTEN BIT(2) + +#define SYNQUACER_HSSPI_DMSTART_START BIT(0) +#define SYNQUACER_HSSPI_DMSTOP_STOP BIT(8) +#define SYNQUACER_HSSPI_DMPSEL_CS_MASK 0x3 +#define SYNQUACER_HSSPI_DMPSEL_CS_SHIFT 16U +#define SYNQUACER_HSSPI_DMTRP_BUS_WIDTH_SHIFT 24U +#define SYNQUACER_HSSPI_DMTRP_DATA_MASK 0x3 +#define SYNQUACER_HSSPI_DMTRP_DATA_SHIFT 26U +#define SYNQUACER_HSSPI_DMTRP_DATA_TXRX 0 +#define SYNQUACER_HSSPI_DMTRP_DATA_RX 1 +#define SYNQUACER_HSSPI_DMTRP_DATA_TX 2 + +#define SYNQUACER_HSSPI_DMSTATUS_RX_DATA_MASK 0x1f +#define SYNQUACER_HSSPI_DMSTATUS_RX_DATA_SHIFT 8U +#define SYNQUACER_HSSPI_DMSTATUS_TX_DATA_MASK 0x1f +#define SYNQUACER_HSSPI_DMSTATUS_TX_DATA_SHIFT 16U + +#define SYNQUACER_HSSPI_FIFOCFG_RX_THRESHOLD_MASK 0xf +#define SYNQUACER_HSSPI_FIFOCFG_RX_THRESHOLD_SHIFT 0U +#define SYNQUACER_HSSPI_FIFOCFG_TX_THRESHOLD_MASK 0xf +#define SYNQUACER_HSSPI_FIFOCFG_TX_THRESHOLD_SHIFT 4U +#define SYNQUACER_HSSPI_FIFOCFG_FIFO_WIDTH_MASK 0x3 +#define SYNQUACER_HSSPI_FIFOCFG_FIFO_WIDTH_SHIFT 8U +#define SYNQUACER_HSSPI_FIFOCFG_RX_FLUSH BIT(11) +#define SYNQUACER_HSSPI_FIFOCFG_TX_FLUSH BIT(12) + +#define SYNQUACER_HSSPI_FIFO_DEPTH 16U +#define SYNQUACER_HSSPI_FIFO_TX_THRESHOLD 4U +#define SYNQUACER_HSSPI_FIFO_RX_THRESHOLD \ + (SYNQUACER_HSSPI_FIFO_DEPTH - SYNQUACER_HSSPI_FIFO_TX_THRESHOLD) + +#define SYNQUACER_HSSPI_TRANSFER_MODE_TX BIT(1) +#define SYNQUACER_HSSPI_TRANSFER_MODE_RX BIT(2) +#define SYNQUACER_HSSPI_TRANSFER_TMOUT_MSEC 2000U +#define SYNQUACER_HSSPI_ENABLE_TMOUT_MSEC 1000U + +#define SYNQUACER_HSSPI_CLOCK_SRC_IHCLK 0 +#define SYNQUACER_HSSPI_CLOCK_SRC_IPCLK 1 + +#define SYNQUACER_HSSPI_NUM_CHIP_SELECT 4U +#define SYNQUACER_HSSPI_IRQ_NAME_MAX 32U + +struct synquacer_spi { + struct device *dev; + struct completion transfer_done; + unsigned int cs; + unsigned int bpw; + unsigned int mode; + unsigned int speed; + bool aces, rtm; + void *rx_buf; + const void *tx_buf; + struct clk *clk; + int clk_src_type; + void __iomem *regs; + u32 tx_words, rx_words; + unsigned int bus_width; + unsigned int transfer_mode; + char rx_irq_name[SYNQUACER_HSSPI_IRQ_NAME_MAX]; + char tx_irq_name[SYNQUACER_HSSPI_IRQ_NAME_MAX]; +}; + +static int read_fifo(struct synquacer_spi *sspi) +{ + u32 len = readl(sspi->regs + SYNQUACER_HSSPI_REG_DMSTATUS); + + len = (len >> SYNQUACER_HSSPI_DMSTATUS_RX_DATA_SHIFT) & + SYNQUACER_HSSPI_DMSTATUS_RX_DATA_MASK; + len = min(len, sspi->rx_words); + + switch (sspi->bpw) { + case 8: { + u8 *buf = sspi->rx_buf; + + readsb(sspi->regs + SYNQUACER_HSSPI_REG_RX_FIFO, buf, len); + sspi->rx_buf = buf + len; + break; + } + case 16: { + u16 *buf = sspi->rx_buf; + + readsw(sspi->regs + SYNQUACER_HSSPI_REG_RX_FIFO, buf, len); + sspi->rx_buf = buf + len; + break; + } + case 24: + /* fallthrough, should use 32-bits access */ + case 32: { + u32 *buf = sspi->rx_buf; + + readsl(sspi->regs + SYNQUACER_HSSPI_REG_RX_FIFO, buf, len); + sspi->rx_buf = buf + len; + break; + } + default: + return -EINVAL; + } + + sspi->rx_words -= len; + return 0; +} + +static int write_fifo(struct synquacer_spi *sspi) +{ + u32 len = readl(sspi->regs + SYNQUACER_HSSPI_REG_DMSTATUS); + + len = (len >> SYNQUACER_HSSPI_DMSTATUS_TX_DATA_SHIFT) & + SYNQUACER_HSSPI_DMSTATUS_TX_DATA_MASK; + len = min(SYNQUACER_HSSPI_FIFO_DEPTH - len, + sspi->tx_words); + + switch (sspi->bpw) { + case 8: { + const u8 *buf = sspi->tx_buf; + + writesb(sspi->regs + SYNQUACER_HSSPI_REG_TX_FIFO, buf, len); + sspi->tx_buf = buf + len; + break; + } + case 16: { + const u16 *buf = sspi->tx_buf; + + writesw(sspi->regs + SYNQUACER_HSSPI_REG_TX_FIFO, buf, len); + sspi->tx_buf = buf + len; + break; + } + case 24: + /* fallthrough, should use 32-bits access */ + case 32: { + const u32 *buf = sspi->tx_buf; + + writesl(sspi->regs + SYNQUACER_HSSPI_REG_TX_FIFO, buf, len); + sspi->tx_buf = buf + len; + break; + } + default: + return -EINVAL; + } + + sspi->tx_words -= len; + return 0; +} + +static int synquacer_spi_config(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct synquacer_spi *sspi = spi_master_get_devdata(master); + unsigned int speed, mode, bpw, cs, bus_width, transfer_mode; + u32 rate, val, div; + + /* Full Duplex only on 1-bit wide bus */ + if (xfer->rx_buf && xfer->tx_buf && + (xfer->rx_nbits != 1 || xfer->tx_nbits != 1)) { + dev_err(sspi->dev, + "RX and TX bus widths must be 1-bit for Full-Duplex!\n"); + return -EINVAL; + } + + if (xfer->tx_buf) { + bus_width = xfer->tx_nbits; + transfer_mode = SYNQUACER_HSSPI_TRANSFER_MODE_TX; + } else { + bus_width = xfer->rx_nbits; + transfer_mode = SYNQUACER_HSSPI_TRANSFER_MODE_RX; + } + + mode = spi->mode; + cs = spi->chip_select; + speed = xfer->speed_hz; + bpw = xfer->bits_per_word; + + /* return if nothing to change */ + if (speed == sspi->speed && + bus_width == sspi->bus_width && bpw == sspi->bpw && + mode == sspi->mode && cs == sspi->cs && + transfer_mode == sspi->transfer_mode) { + return 0; + } + + sspi->transfer_mode = transfer_mode; + rate = master->max_speed_hz; + + div = DIV_ROUND_UP(rate, speed); + if (div > 254) { + dev_err(sspi->dev, "Requested rate too low (%u)\n", + sspi->speed); + return -EINVAL; + } + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_PCC(cs)); + val &= ~SYNQUACER_HSSPI_PCC_SAFESYNC; + if (bpw == 8 && (mode & (SPI_TX_DUAL | SPI_RX_DUAL)) && div < 3) + val |= SYNQUACER_HSSPI_PCC_SAFESYNC; + if (bpw == 8 && (mode & (SPI_TX_QUAD | SPI_RX_QUAD)) && div < 6) + val |= SYNQUACER_HSSPI_PCC_SAFESYNC; + if (bpw == 16 && (mode & (SPI_TX_QUAD | SPI_RX_QUAD)) && div < 3) + val |= SYNQUACER_HSSPI_PCC_SAFESYNC; + + if (mode & SPI_CPHA) + val |= SYNQUACER_HSSPI_PCC_CPHA; + else + val &= ~SYNQUACER_HSSPI_PCC_CPHA; + + if (mode & SPI_CPOL) + val |= SYNQUACER_HSSPI_PCC_CPOL; + else + val &= ~SYNQUACER_HSSPI_PCC_CPOL; + + if (mode & SPI_CS_HIGH) + val |= SYNQUACER_HSSPI_PCC_SSPOL; + else + val &= ~SYNQUACER_HSSPI_PCC_SSPOL; + + if (mode & SPI_LSB_FIRST) + val |= SYNQUACER_HSSPI_PCC_SDIR; + else + val &= ~SYNQUACER_HSSPI_PCC_SDIR; + + if (sspi->aces) + val |= SYNQUACER_HSSPI_PCC_ACES; + else + val &= ~SYNQUACER_HSSPI_PCC_ACES; + + if (sspi->rtm) + val |= SYNQUACER_HSSPI_PCC_RTM; + else + val &= ~SYNQUACER_HSSPI_PCC_RTM; + + val |= (3 << SYNQUACER_HSSPI_PCC_SS2CD_SHIFT); + val |= SYNQUACER_HSSPI_PCC_SENDIAN; + + val &= ~(SYNQUACER_HSSPI_PCC_CDRS_MASK << + SYNQUACER_HSSPI_PCC_CDRS_SHIFT); + val |= ((div >> 1) << SYNQUACER_HSSPI_PCC_CDRS_SHIFT); + + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_PCC(cs)); + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_FIFOCFG); + val &= ~(SYNQUACER_HSSPI_FIFOCFG_FIFO_WIDTH_MASK << + SYNQUACER_HSSPI_FIFOCFG_FIFO_WIDTH_SHIFT); + val |= ((bpw / 8 - 1) << SYNQUACER_HSSPI_FIFOCFG_FIFO_WIDTH_SHIFT); + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_FIFOCFG); + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + val &= ~(SYNQUACER_HSSPI_DMTRP_DATA_MASK << + SYNQUACER_HSSPI_DMTRP_DATA_SHIFT); + + if (xfer->rx_buf) + val |= (SYNQUACER_HSSPI_DMTRP_DATA_RX << + SYNQUACER_HSSPI_DMTRP_DATA_SHIFT); + else + val |= (SYNQUACER_HSSPI_DMTRP_DATA_TX << + SYNQUACER_HSSPI_DMTRP_DATA_SHIFT); + + val &= ~(3 << SYNQUACER_HSSPI_DMTRP_BUS_WIDTH_SHIFT); + val |= ((bus_width >> 1) << SYNQUACER_HSSPI_DMTRP_BUS_WIDTH_SHIFT); + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + + sspi->bpw = bpw; + sspi->mode = mode; + sspi->speed = speed; + sspi->cs = spi->chip_select; + sspi->bus_width = bus_width; + + return 0; +} + +static int synquacer_spi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct synquacer_spi *sspi = spi_master_get_devdata(master); + int ret; + int status = 0; + u32 words; + u8 bpw; + u32 val; + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + val &= ~SYNQUACER_HSSPI_DMSTOP_STOP; + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_FIFOCFG); + val |= SYNQUACER_HSSPI_FIFOCFG_RX_FLUSH; + val |= SYNQUACER_HSSPI_FIFOCFG_TX_FLUSH; + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_FIFOCFG); + + /* + * See if we can transfer 4-bytes as 1 word + * to maximize the FIFO buffer efficiency. + */ + bpw = xfer->bits_per_word; + if (bpw == 8 && !(xfer->len % 4) && !(spi->mode & SPI_LSB_FIRST)) + xfer->bits_per_word = 32; + + ret = synquacer_spi_config(master, spi, xfer); + + /* restore */ + xfer->bits_per_word = bpw; + + if (ret) + return ret; + + reinit_completion(&sspi->transfer_done); + + sspi->tx_buf = xfer->tx_buf; + sspi->rx_buf = xfer->rx_buf; + + switch (sspi->bpw) { + case 8: + words = xfer->len; + break; + case 16: + words = xfer->len / 2; + break; + case 24: + /* fallthrough, should use 32-bits access */ + case 32: + words = xfer->len / 4; + break; + default: + dev_err(sspi->dev, "unsupported bpw: %d\n", sspi->bpw); + return -EINVAL; + } + + if (xfer->tx_buf) + sspi->tx_words = words; + else + sspi->tx_words = 0; + + if (xfer->rx_buf) + sspi->rx_words = words; + else + sspi->rx_words = 0; + + if (xfer->tx_buf) { + status = write_fifo(sspi); + if (status < 0) { + dev_err(sspi->dev, "failed write_fifo. status: 0x%x\n", + status); + return status; + } + } + + if (xfer->rx_buf) { + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_FIFOCFG); + val &= ~(SYNQUACER_HSSPI_FIFOCFG_RX_THRESHOLD_MASK << + SYNQUACER_HSSPI_FIFOCFG_RX_THRESHOLD_SHIFT); + val |= ((sspi->rx_words > SYNQUACER_HSSPI_FIFO_DEPTH ? + SYNQUACER_HSSPI_FIFO_RX_THRESHOLD : sspi->rx_words) << + SYNQUACER_HSSPI_FIFOCFG_RX_THRESHOLD_SHIFT); + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_FIFOCFG); + } + + writel(~0, sspi->regs + SYNQUACER_HSSPI_REG_TXC); + writel(~0, sspi->regs + SYNQUACER_HSSPI_REG_RXC); + + /* Trigger */ + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + val |= SYNQUACER_HSSPI_DMSTART_START; + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + + if (xfer->tx_buf) { + val = SYNQUACER_HSSPI_TXE_FIFO_EMPTY; + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_TXE); + status = wait_for_completion_timeout(&sspi->transfer_done, + msecs_to_jiffies(SYNQUACER_HSSPI_TRANSFER_TMOUT_MSEC)); + writel(0, sspi->regs + SYNQUACER_HSSPI_REG_TXE); + } + + if (xfer->rx_buf) { + u32 buf[SYNQUACER_HSSPI_FIFO_DEPTH]; + + val = SYNQUACER_HSSPI_RXE_FIFO_MORE_THAN_THRESHOLD | + SYNQUACER_HSSPI_RXE_SLAVE_RELEASED; + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_RXE); + status = wait_for_completion_timeout(&sspi->transfer_done, + msecs_to_jiffies(SYNQUACER_HSSPI_TRANSFER_TMOUT_MSEC)); + writel(0, sspi->regs + SYNQUACER_HSSPI_REG_RXE); + + /* stop RX and clean RXFIFO */ + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + val |= SYNQUACER_HSSPI_DMSTOP_STOP; + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + sspi->rx_buf = buf; + sspi->rx_words = SYNQUACER_HSSPI_FIFO_DEPTH; + read_fifo(sspi); + } + + if (status < 0) { + dev_err(sspi->dev, "failed to transfer. status: 0x%x\n", + status); + return status; + } + + return 0; +} + +static void synquacer_spi_set_cs(struct spi_device *spi, bool enable) +{ + struct synquacer_spi *sspi = spi_master_get_devdata(spi->master); + u32 val; + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); + val &= ~(SYNQUACER_HSSPI_DMPSEL_CS_MASK << + SYNQUACER_HSSPI_DMPSEL_CS_SHIFT); + val |= spi->chip_select << SYNQUACER_HSSPI_DMPSEL_CS_SHIFT; + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_DMSTART); +} + +static int synquacer_spi_wait_status_update(struct synquacer_spi *sspi, + bool enable) +{ + u32 val; + unsigned long timeout = jiffies + + msecs_to_jiffies(SYNQUACER_HSSPI_ENABLE_TMOUT_MSEC); + + /* wait MES(Module Enable Status) is updated */ + do { + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_MCTRL) & + SYNQUACER_HSSPI_MCTRL_MES; + if (enable && val) + return 0; + if (!enable && !val) + return 0; + } while (time_before(jiffies, timeout)); + + dev_err(sspi->dev, "timeout occurs in updating Module Enable Status\n"); + return -EBUSY; +} + +static int synquacer_spi_enable(struct spi_master *master) +{ + u32 val; + int status; + struct synquacer_spi *sspi = spi_master_get_devdata(master); + + /* Disable module */ + writel(0, sspi->regs + SYNQUACER_HSSPI_REG_MCTRL); + status = synquacer_spi_wait_status_update(sspi, false); + if (status < 0) + return status; + + writel(0, sspi->regs + SYNQUACER_HSSPI_REG_TXE); + writel(0, sspi->regs + SYNQUACER_HSSPI_REG_RXE); + writel(~0, sspi->regs + SYNQUACER_HSSPI_REG_TXC); + writel(~0, sspi->regs + SYNQUACER_HSSPI_REG_RXC); + writel(~0, sspi->regs + SYNQUACER_HSSPI_REG_FAULTC); + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_DMCFG); + val &= ~SYNQUACER_HSSPI_DMCFG_SSDC; + val &= ~SYNQUACER_HSSPI_DMCFG_MSTARTEN; + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_DMCFG); + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_MCTRL); + if (sspi->clk_src_type == SYNQUACER_HSSPI_CLOCK_SRC_IPCLK) + val |= SYNQUACER_HSSPI_MCTRL_CDSS; + else + val &= ~SYNQUACER_HSSPI_MCTRL_CDSS; + + val &= ~SYNQUACER_HSSPI_MCTRL_COMMAND_SEQUENCE_EN; + val |= SYNQUACER_HSSPI_MCTRL_MEN; + val |= SYNQUACER_HSSPI_MCTRL_SYNCON; + + /* Enable module */ + writel(val, sspi->regs + SYNQUACER_HSSPI_REG_MCTRL); + status = synquacer_spi_wait_status_update(sspi, true); + if (status < 0) + return status; + + return 0; +} + +static irqreturn_t sq_spi_rx_handler(int irq, void *priv) +{ + uint32_t val; + struct synquacer_spi *sspi = priv; + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_RXF); + if ((val & SYNQUACER_HSSPI_RXF_SLAVE_RELEASED) || + (val & SYNQUACER_HSSPI_RXF_FIFO_MORE_THAN_THRESHOLD)) { + read_fifo(sspi); + + if (sspi->rx_words == 0) { + writel(0, sspi->regs + SYNQUACER_HSSPI_REG_RXE); + complete(&sspi->transfer_done); + } + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static irqreturn_t sq_spi_tx_handler(int irq, void *priv) +{ + uint32_t val; + struct synquacer_spi *sspi = priv; + + val = readl(sspi->regs + SYNQUACER_HSSPI_REG_TXF); + if (val & SYNQUACER_HSSPI_TXF_FIFO_EMPTY) { + if (sspi->tx_words == 0) { + writel(0, sspi->regs + SYNQUACER_HSSPI_REG_TXE); + complete(&sspi->transfer_done); + } else { + write_fifo(sspi); + } + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static int synquacer_spi_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct spi_master *master; + struct synquacer_spi *sspi; + int ret; + int rx_irq, tx_irq; + + master = spi_alloc_master(&pdev->dev, sizeof(*sspi)); + if (!master) + return -ENOMEM; + + platform_set_drvdata(pdev, master); + + sspi = spi_master_get_devdata(master); + sspi->dev = &pdev->dev; + + init_completion(&sspi->transfer_done); + + sspi->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(sspi->regs)) { + ret = PTR_ERR(sspi->regs); + goto put_spi; + } + + sspi->clk_src_type = SYNQUACER_HSSPI_CLOCK_SRC_IHCLK; /* Default */ + device_property_read_u32(&pdev->dev, "socionext,ihclk-rate", + &master->max_speed_hz); /* for ACPI */ + + if (dev_of_node(&pdev->dev)) { + if (device_property_match_string(&pdev->dev, + "clock-names", "iHCLK") >= 0) { + sspi->clk_src_type = SYNQUACER_HSSPI_CLOCK_SRC_IHCLK; + sspi->clk = devm_clk_get(sspi->dev, "iHCLK"); + } else if (device_property_match_string(&pdev->dev, + "clock-names", "iPCLK") >= 0) { + sspi->clk_src_type = SYNQUACER_HSSPI_CLOCK_SRC_IPCLK; + sspi->clk = devm_clk_get(sspi->dev, "iPCLK"); + } else { + dev_err(&pdev->dev, "specified wrong clock source\n"); + ret = -EINVAL; + goto put_spi; + } + + if (IS_ERR(sspi->clk)) { + if (!(PTR_ERR(sspi->clk) == -EPROBE_DEFER)) + dev_err(&pdev->dev, "clock not found\n"); + ret = PTR_ERR(sspi->clk); + goto put_spi; + } + + ret = clk_prepare_enable(sspi->clk); + if (ret) { + dev_err(&pdev->dev, "failed to enable clock (%d)\n", + ret); + goto put_spi; + } + + master->max_speed_hz = clk_get_rate(sspi->clk); + } + + if (!master->max_speed_hz) { + dev_err(&pdev->dev, "missing clock source\n"); + return -EINVAL; + } + master->min_speed_hz = master->max_speed_hz / 254; + + sspi->aces = device_property_read_bool(&pdev->dev, + "socionext,set-aces"); + sspi->rtm = device_property_read_bool(&pdev->dev, "socionext,use-rtm"); + + master->num_chipselect = SYNQUACER_HSSPI_NUM_CHIP_SELECT; + + rx_irq = platform_get_irq(pdev, 0); + if (rx_irq <= 0) { + dev_err(&pdev->dev, "get rx_irq failed (%d)\n", rx_irq); + ret = rx_irq; + goto put_spi; + } + snprintf(sspi->rx_irq_name, SYNQUACER_HSSPI_IRQ_NAME_MAX, "%s-rx", + dev_name(&pdev->dev)); + ret = devm_request_irq(&pdev->dev, rx_irq, sq_spi_rx_handler, + 0, sspi->rx_irq_name, sspi); + if (ret) { + dev_err(&pdev->dev, "request rx_irq failed (%d)\n", ret); + goto put_spi; + } + + tx_irq = platform_get_irq(pdev, 1); + if (tx_irq <= 0) { + dev_err(&pdev->dev, "get tx_irq failed (%d)\n", tx_irq); + ret = tx_irq; + goto put_spi; + } + snprintf(sspi->tx_irq_name, SYNQUACER_HSSPI_IRQ_NAME_MAX, "%s-tx", + dev_name(&pdev->dev)); + ret = devm_request_irq(&pdev->dev, tx_irq, sq_spi_tx_handler, + 0, sspi->tx_irq_name, sspi); + if (ret) { + dev_err(&pdev->dev, "request tx_irq failed (%d)\n", ret); + goto put_spi; + } + + master->dev.of_node = np; + master->dev.fwnode = pdev->dev.fwnode; + master->auto_runtime_pm = true; + master->bus_num = pdev->id; + + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_TX_DUAL | SPI_RX_DUAL | + SPI_TX_QUAD | SPI_RX_QUAD; + master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(24) | + SPI_BPW_MASK(16) | SPI_BPW_MASK(8); + + master->set_cs = synquacer_spi_set_cs; + master->transfer_one = synquacer_spi_transfer_one; + + ret = synquacer_spi_enable(master); + if (ret) + goto fail_enable; + + pm_runtime_set_active(sspi->dev); + pm_runtime_enable(sspi->dev); + + ret = devm_spi_register_master(sspi->dev, master); + if (ret) + goto disable_pm; + + return 0; + +disable_pm: + pm_runtime_disable(sspi->dev); +fail_enable: + clk_disable_unprepare(sspi->clk); +put_spi: + spi_master_put(master); + + return ret; +} + +static int synquacer_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct synquacer_spi *sspi = spi_master_get_devdata(master); + + pm_runtime_disable(sspi->dev); + + clk_disable_unprepare(sspi->clk); + + return 0; +} + +static int __maybe_unused synquacer_spi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct synquacer_spi *sspi = spi_master_get_devdata(master); + int ret; + + ret = spi_master_suspend(master); + if (ret) + return ret; + + if (!pm_runtime_suspended(dev)) + clk_disable_unprepare(sspi->clk); + + return ret; +} + +static int __maybe_unused synquacer_spi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct synquacer_spi *sspi = spi_master_get_devdata(master); + int ret; + + if (!pm_runtime_suspended(dev)) { + /* Ensure reconfigure during next xfer */ + sspi->speed = 0; + + ret = clk_prepare_enable(sspi->clk); + if (ret < 0) { + dev_err(dev, "failed to enable clk (%d)\n", + ret); + return ret; + } + + ret = synquacer_spi_enable(master); + if (ret) { + dev_err(dev, "failed to enable spi (%d)\n", ret); + return ret; + } + } + + ret = spi_master_resume(master); + if (ret < 0) + clk_disable_unprepare(sspi->clk); + + return ret; +} + +static SIMPLE_DEV_PM_OPS(synquacer_spi_pm_ops, synquacer_spi_suspend, + synquacer_spi_resume); + +static const struct of_device_id synquacer_spi_of_match[] = { + {.compatible = "socionext,synquacer-spi"}, + {} +}; +MODULE_DEVICE_TABLE(of, synquacer_spi_of_match); + +#ifdef CONFIG_ACPI +static const struct acpi_device_id synquacer_hsspi_acpi_ids[] = { + { "SCX0004" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(acpi, synquacer_hsspi_acpi_ids); +#endif + +static struct platform_driver synquacer_spi_driver = { + .driver = { + .name = "synquacer-spi", + .pm = &synquacer_spi_pm_ops, + .of_match_table = synquacer_spi_of_match, + .acpi_match_table = ACPI_PTR(synquacer_hsspi_acpi_ids), + }, + .probe = synquacer_spi_probe, + .remove = synquacer_spi_remove, +}; +module_platform_driver(synquacer_spi_driver); + +MODULE_DESCRIPTION("Socionext Synquacer HS-SPI controller driver"); +MODULE_AUTHOR("Masahisa Kojima <masahisa.kojima@linaro.org>"); +MODULE_AUTHOR("Jassi Brar <jaswinder.singh@linaro.org>"); +MODULE_LICENSE("GPL v2"); |