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368 lines
11 KiB
368 lines
11 KiB
--- a/drivers/spi/spi-rt2880.c
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+++ b/drivers/spi/spi-rt2880.c
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@@ -29,16 +29,17 @@
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#define SPI_BPW_MASK(bits) BIT((bits) - 1)
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#define DRIVER_NAME "spi-rt2880"
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-/* only one slave is supported*/
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-#define RALINK_NUM_CHIPSELECTS 1
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/* in usec */
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#define RALINK_SPI_WAIT_MAX_LOOP 2000
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-#define RAMIPS_SPI_STAT 0x00
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-#define RAMIPS_SPI_CFG 0x10
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-#define RAMIPS_SPI_CTL 0x14
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-#define RAMIPS_SPI_DATA 0x20
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-#define RAMIPS_SPI_FIFO_STAT 0x38
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+#define RAMIPS_SPI_DEV_OFFSET 0x40
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+
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+#define RAMIPS_SPI_STAT(cs) (0x00 + (cs * RAMIPS_SPI_DEV_OFFSET))
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+#define RAMIPS_SPI_CFG(cs) (0x10 + (cs * RAMIPS_SPI_DEV_OFFSET))
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+#define RAMIPS_SPI_CTL(cs) (0x14 + (cs * RAMIPS_SPI_DEV_OFFSET))
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+#define RAMIPS_SPI_DATA(cs) (0x20 + (cs * RAMIPS_SPI_DEV_OFFSET))
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+#define RAMIPS_SPI_FIFO_STAT(cs) (0x38 + (cs * RAMIPS_SPI_DEV_OFFSET))
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+#define RAMIPS_SPI_ARBITER 0xF0
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/* SPISTAT register bit field */
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#define SPISTAT_BUSY BIT(0)
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@@ -68,6 +69,10 @@
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/* SPIFIFOSTAT register bit field */
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#define SPIFIFOSTAT_TXFULL BIT(17)
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+#define SPICTL_ARB_EN BIT(31)
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+#define SPI1_POR BIT(1)
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+#define SPI0_POR BIT(0)
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+
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#define MT7621_SPI_TRANS 0x00
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#define SPITRANS_BUSY BIT(16)
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#define MT7621_SPI_OPCODE 0x04
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@@ -78,13 +83,16 @@
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#define MT7621_SPI_MASTER 0x28
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#define MT7621_SPI_SPACE 0x3c
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+#define RT2880_SPI_MODE_BITS (SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_CS_HIGH)
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+
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struct rt2880_spi;
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struct rt2880_spi_ops {
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void (*init_hw)(struct rt2880_spi *rs);
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- void (*set_cs)(struct rt2880_spi *rs, int enable);
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+ void (*set_cs)(struct spi_device *spi, int enable);
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int (*baudrate_set)(struct spi_device *spi, unsigned int speed);
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unsigned int (*write_read)(struct spi_device *spi, struct list_head *list, struct spi_transfer *xfer);
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+ int num_cs;
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};
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struct rt2880_spi {
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@@ -141,6 +149,7 @@ static inline void rt2880_spi_clrbits(st
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static int rt2880_spi_baudrate_set(struct spi_device *spi, unsigned int speed)
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{
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+ int cs = spi->chip_select;
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struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
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u32 rate;
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u32 prescale;
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@@ -168,9 +177,9 @@ static int rt2880_spi_baudrate_set(struc
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prescale = ilog2(rate / 2);
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dev_dbg(&spi->dev, "prescale:%u\n", prescale);
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- reg = rt2880_spi_read(rs, RAMIPS_SPI_CFG);
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+ reg = rt2880_spi_read(rs, RAMIPS_SPI_CFG(cs));
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reg = ((reg & ~SPICFG_SPICLK_PRESCALE_MASK) | prescale);
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- rt2880_spi_write(rs, RAMIPS_SPI_CFG, reg);
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+ rt2880_spi_write(rs, RAMIPS_SPI_CFG(cs), reg);
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rs->speed = speed;
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return 0;
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}
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@@ -194,7 +203,8 @@ rt2880_spi_setup_transfer(struct spi_dev
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{
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struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
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unsigned int speed = spi->max_speed_hz;
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- int rc;
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+ int rc, cs = spi->chip_select;
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+ u32 reg;
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if ((t != NULL) && t->speed_hz)
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speed = t->speed_hz;
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@@ -206,19 +216,61 @@ rt2880_spi_setup_transfer(struct spi_dev
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return rc;
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}
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+ reg = rt2880_spi_read(rs, RAMIPS_SPI_CFG(cs));
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+
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+ reg = (reg & ~SPICFG_MSBFIRST);
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+ if (!(spi->mode & SPI_LSB_FIRST))
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+ reg |= SPICFG_MSBFIRST;
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+
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+ reg = (reg & ~(SPICFG_SPICLKPOL | SPICFG_RXCLKEDGE_FALLING |SPICFG_TXCLKEDGE_FALLING));
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+ switch(spi->mode & (SPI_CPOL | SPI_CPHA)) {
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+ case SPI_MODE_0:
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+ reg |= SPICFG_SPICLKPOL | SPICFG_TXCLKEDGE_FALLING;
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+ break;
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+ case SPI_MODE_1:
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+ reg |= SPICFG_SPICLKPOL | SPICFG_RXCLKEDGE_FALLING;
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+ break;
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+ case SPI_MODE_2:
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+ reg |= SPICFG_RXCLKEDGE_FALLING;
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+ break;
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+ case SPI_MODE_3:
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+ reg |= SPICFG_TXCLKEDGE_FALLING;
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+ break;
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+ }
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+
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+ rt2880_spi_write(rs, RAMIPS_SPI_CFG(cs), reg);
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+
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+ reg = SPICTL_ARB_EN;
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+ if (spi->mode & SPI_CS_HIGH) {
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+ switch(cs) {
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+ case 0:
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+ reg |= SPI0_POR;
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+ break;
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+ case 1:
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+ reg |= SPI1_POR;
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+ break;
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+ }
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+ }
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+
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+ rt2880_spi_write(rs, RAMIPS_SPI_ARBITER, reg);
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+
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return 0;
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}
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-static void rt2880_spi_set_cs(struct rt2880_spi *rs, int enable)
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+static void rt2880_spi_set_cs(struct spi_device *spi, int enable)
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{
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+ struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
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+ int cs = spi->chip_select;
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+
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if (enable)
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- rt2880_spi_clrbits(rs, RAMIPS_SPI_CTL, SPICTL_SPIENA);
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+ rt2880_spi_clrbits(rs, RAMIPS_SPI_CTL(cs), SPICTL_SPIENA);
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else
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- rt2880_spi_setbits(rs, RAMIPS_SPI_CTL, SPICTL_SPIENA);
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+ rt2880_spi_setbits(rs, RAMIPS_SPI_CTL(cs), SPICTL_SPIENA);
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}
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-static void mt7621_spi_set_cs(struct rt2880_spi *rs, int enable)
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+static void mt7621_spi_set_cs(struct spi_device *spi, int enable)
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{
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+ struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
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u32 polar = rt2880_spi_read(rs, MT7621_SPI_POLAR);
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if (enable)
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@@ -228,14 +280,16 @@ static void mt7621_spi_set_cs(struct rt2
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rt2880_spi_write(rs, MT7621_SPI_POLAR, polar);
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}
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-static inline int rt2880_spi_wait_till_ready(struct rt2880_spi *rs)
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+static inline int rt2880_spi_wait_till_ready(struct spi_device *spi)
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{
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+ struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
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+ int cs = spi->chip_select;
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int i;
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for (i = 0; i < RALINK_SPI_WAIT_MAX_LOOP; i++) {
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u32 status;
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- status = rt2880_spi_read(rs, RAMIPS_SPI_STAT);
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+ status = rt2880_spi_read(rs, RAMIPS_SPI_STAT(cs));
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if ((status & SPISTAT_BUSY) == 0)
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return 0;
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@@ -246,8 +300,9 @@ static inline int rt2880_spi_wait_till_r
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return -ETIMEDOUT;
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}
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-static inline int mt7621_spi_wait_till_ready(struct rt2880_spi *rs)
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+static inline int mt7621_spi_wait_till_ready(struct spi_device *spi)
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{
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+ struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
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int i;
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for (i = 0; i < RALINK_SPI_WAIT_MAX_LOOP; i++) {
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@@ -268,6 +323,7 @@ static unsigned int
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rt2880_spi_write_read(struct spi_device *spi, struct list_head *list, struct spi_transfer *xfer)
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{
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struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
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+ int cs = spi->chip_select;
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unsigned count = 0;
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u8 *rx = xfer->rx_buf;
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const u8 *tx = xfer->tx_buf;
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@@ -279,9 +335,9 @@ rt2880_spi_write_read(struct spi_device
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if (tx) {
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for (count = 0; count < xfer->len; count++) {
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- rt2880_spi_write(rs, RAMIPS_SPI_DATA, tx[count]);
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- rt2880_spi_setbits(rs, RAMIPS_SPI_CTL, SPICTL_STARTWR);
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- err = rt2880_spi_wait_till_ready(rs);
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+ rt2880_spi_write(rs, RAMIPS_SPI_DATA(cs), tx[count]);
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+ rt2880_spi_setbits(rs, RAMIPS_SPI_CTL(cs), SPICTL_STARTWR);
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+ err = rt2880_spi_wait_till_ready(spi);
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if (err) {
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dev_err(&spi->dev, "TX failed, err=%d\n", err);
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goto out;
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@@ -291,13 +347,13 @@ rt2880_spi_write_read(struct spi_device
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if (rx) {
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for (count = 0; count < xfer->len; count++) {
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- rt2880_spi_setbits(rs, RAMIPS_SPI_CTL, SPICTL_STARTRD);
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- err = rt2880_spi_wait_till_ready(rs);
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+ rt2880_spi_setbits(rs, RAMIPS_SPI_CTL(cs), SPICTL_STARTRD);
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+ err = rt2880_spi_wait_till_ready(spi);
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if (err) {
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dev_err(&spi->dev, "RX failed, err=%d\n", err);
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goto out;
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}
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- rx[count] = (u8) rt2880_spi_read(rs, RAMIPS_SPI_DATA);
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+ rx[count] = (u8) rt2880_spi_read(rs, RAMIPS_SPI_DATA(cs));
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}
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}
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@@ -364,7 +420,7 @@ mt7621_spi_write_read(struct spi_device
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trans |= SPI_CTL_START;
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rt2880_spi_write(rs, MT7621_SPI_TRANS, trans);
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- mt7621_spi_wait_till_ready(rs);
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+ mt7621_spi_wait_till_ready(spi);
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if (rx) {
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u32 data0 = rt2880_spi_read(rs, MT7621_SPI_DATA0);
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@@ -440,7 +496,7 @@ static int rt2880_spi_transfer_one_messa
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}
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if (!cs_active) {
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- rs->ops->set_cs(rs, 1);
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+ rs->ops->set_cs(spi, 1);
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cs_active = 1;
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}
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@@ -451,14 +507,14 @@ static int rt2880_spi_transfer_one_messa
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udelay(t->delay_usecs);
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if (t->cs_change) {
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- rs->ops->set_cs(rs, 0);
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+ rs->ops->set_cs(spi, 0);
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cs_active = 0;
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}
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}
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msg_done:
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if (cs_active)
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- rs->ops->set_cs(rs, 0);
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+ rs->ops->set_cs(spi, 0);
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m->status = status;
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spi_finalize_current_message(master);
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@@ -471,7 +527,7 @@ static int rt2880_spi_setup(struct spi_d
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struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
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if ((spi->max_speed_hz == 0) ||
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- (spi->max_speed_hz > (rs->sys_freq / 2)))
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+ (spi->max_speed_hz > (rs->sys_freq / 2)))
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spi->max_speed_hz = (rs->sys_freq / 2);
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if (spi->max_speed_hz < (rs->sys_freq / 128)) {
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@@ -488,10 +544,25 @@ static int rt2880_spi_setup(struct spi_d
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static void rt2880_spi_reset(struct rt2880_spi *rs)
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{
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- rt2880_spi_write(rs, RAMIPS_SPI_CFG,
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+ rt2880_spi_write(rs, RAMIPS_SPI_CFG(0),
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SPICFG_MSBFIRST | SPICFG_TXCLKEDGE_FALLING |
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SPICFG_SPICLK_DIV16 | SPICFG_SPICLKPOL);
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- rt2880_spi_write(rs, RAMIPS_SPI_CTL, SPICTL_HIZSDO | SPICTL_SPIENA);
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+ rt2880_spi_write(rs, RAMIPS_SPI_CTL(0), SPICTL_HIZSDO | SPICTL_SPIENA);
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+}
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+
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+static void rt5350_spi_reset(struct rt2880_spi *rs)
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+{
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+ int cs;
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+
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+ rt2880_spi_write(rs, RAMIPS_SPI_ARBITER,
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+ SPICTL_ARB_EN);
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+
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+ for (cs = 0; cs < rs->ops->num_cs; cs++) {
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+ rt2880_spi_write(rs, RAMIPS_SPI_CFG(cs),
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+ SPICFG_MSBFIRST | SPICFG_TXCLKEDGE_FALLING |
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+ SPICFG_SPICLK_DIV16 | SPICFG_SPICLKPOL);
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+ rt2880_spi_write(rs, RAMIPS_SPI_CTL(cs), SPICTL_HIZSDO | SPICTL_SPIENA);
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+ }
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}
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static void mt7621_spi_reset(struct rt2880_spi *rs)
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@@ -511,24 +582,33 @@ static struct rt2880_spi_ops spi_ops[] =
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.set_cs = rt2880_spi_set_cs,
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.baudrate_set = rt2880_spi_baudrate_set,
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.write_read = rt2880_spi_write_read,
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+ .num_cs = 1,
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+ }, {
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+ .init_hw = rt5350_spi_reset,
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+ .set_cs = rt2880_spi_set_cs,
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+ .baudrate_set = rt2880_spi_baudrate_set,
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+ .write_read = rt2880_spi_write_read,
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+ .num_cs = 2,
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}, {
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.init_hw = mt7621_spi_reset,
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.set_cs = mt7621_spi_set_cs,
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.baudrate_set = mt7621_spi_baudrate_set,
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.write_read = mt7621_spi_write_read,
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+ .num_cs = 1,
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},
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};
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static const struct of_device_id rt2880_spi_match[] = {
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{ .compatible = "ralink,rt2880-spi", .data = &spi_ops[0]},
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- { .compatible = "ralink,mt7621-spi", .data = &spi_ops[1] },
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+ { .compatible = "ralink,rt5350-spi", .data = &spi_ops[1]},
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+ { .compatible = "ralink,mt7621-spi", .data = &spi_ops[2] },
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{},
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};
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MODULE_DEVICE_TABLE(of, rt2880_spi_match);
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static int rt2880_spi_probe(struct platform_device *pdev)
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{
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- const struct of_device_id *match;
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+ const struct of_device_id *match;
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struct spi_master *master;
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struct rt2880_spi *rs;
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unsigned long flags;
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@@ -536,10 +616,12 @@ static int rt2880_spi_probe(struct platf
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struct resource *r;
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int status = 0;
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struct clk *clk;
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+ struct rt2880_spi_ops *ops;
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- match = of_match_device(rt2880_spi_match, &pdev->dev);
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+ match = of_match_device(rt2880_spi_match, &pdev->dev);
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if (!match)
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return -EINVAL;
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+ ops = (struct rt2880_spi_ops *)match->data;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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base = devm_ioremap_resource(&pdev->dev, r);
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@@ -563,14 +645,13 @@ static int rt2880_spi_probe(struct platf
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return -ENOMEM;
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}
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- /* we support only mode 0, and no options */
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- master->mode_bits = 0;
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+ master->mode_bits = RT2880_SPI_MODE_BITS;
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master->setup = rt2880_spi_setup;
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master->transfer_one_message = rt2880_spi_transfer_one_message;
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- master->num_chipselect = RALINK_NUM_CHIPSELECTS;
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master->bits_per_word_mask = SPI_BPW_MASK(8);
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master->dev.of_node = pdev->dev.of_node;
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+ master->num_chipselect = ops->num_cs;
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dev_set_drvdata(&pdev->dev, master);
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@@ -579,7 +660,7 @@ static int rt2880_spi_probe(struct platf
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rs->clk = clk;
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rs->master = master;
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rs->sys_freq = clk_get_rate(rs->clk);
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- rs->ops = (struct rt2880_spi_ops *) match->data;
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+ rs->ops = ops;
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dev_dbg(&pdev->dev, "sys_freq: %u\n", rs->sys_freq);
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spin_lock_irqsave(&rs->lock, flags);
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