diff options
Diffstat (limited to 'target/linux')
| -rw-r--r-- | target/linux/ramips/patches-3.18/0061-SPI-ralink-add-mt7621-SoC-spi-driver.patch | 191 |
1 files changed, 178 insertions, 13 deletions
diff --git a/target/linux/ramips/patches-3.18/0061-SPI-ralink-add-mt7621-SoC-spi-driver.patch b/target/linux/ramips/patches-3.18/0061-SPI-ralink-add-mt7621-SoC-spi-driver.patch index 762462f95d..2ba1ee8776 100644 --- a/target/linux/ramips/patches-3.18/0061-SPI-ralink-add-mt7621-SoC-spi-driver.patch +++ b/target/linux/ramips/patches-3.18/0061-SPI-ralink-add-mt7621-SoC-spi-driver.patch @@ -25,7 +25,7 @@ obj-$(CONFIG_SPI_OC_TINY) += spi-oc-tiny.o --- /dev/null +++ b/drivers/spi/spi-mt7621.c -@@ -0,0 +1,314 @@ +@@ -0,0 +1,479 @@ +/* + * spi-mt7621.c -- MediaTek MT7621 SPI controller driver + * @@ -70,6 +70,7 @@ + +#define MT7621_SPI_OPCODE 0x04 +#define MT7621_SPI_DATA0 0x08 ++#define MT7621_SPI_DATA4 0x18 +#define SPI_CTL_TX_RX_CNT_MASK 0xff +#define SPI_CTL_START BIT(8) + @@ -78,6 +79,10 @@ +#define MT7621_SPI_MOREBUF 0x2c +#define MT7621_SPI_SPACE 0x3c + ++#define MT7621_CPHA BIT(5) ++#define MT7621_CPOL BIT(4) ++#define MT7621_LSB_FIRST BIT(3) ++ +#define RT2880_SPI_MODE_BITS (SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_CS_HIGH) + +struct mt7621_spi; @@ -108,17 +113,77 @@ + iowrite32(val, rs->base + reg); +} + ++static void mt7621_spi_reset(struct mt7621_spi *rs, int duplex) ++{ ++ u32 master = mt7621_spi_read(rs, MT7621_SPI_MASTER); ++ ++ master &= ~(0xfff << 16); ++ master |= 1 << 16; ++ master |= 7 << 29; ++ master |= 1 << 2; ++ if (duplex) ++ master |= 1 << 10; ++ ++ mt7621_spi_write(rs, MT7621_SPI_MASTER, master); ++} ++ +static void mt7621_spi_set_cs(struct spi_device *spi, int enable) +{ + struct mt7621_spi *rs = spidev_to_mt7621_spi(spi); + int cs = spi->chip_select; + u32 polar = 0; + ++ mt7621_spi_reset(rs, cs); + if (enable) + polar = BIT(cs); + mt7621_spi_write(rs, MT7621_SPI_POLAR, polar); +} + ++static int mt7621_spi_prepare(struct spi_device *spi, unsigned int speed) ++{ ++ struct mt7621_spi *rs = spidev_to_mt7621_spi(spi); ++ u32 rate; ++ u32 reg; ++ ++ dev_dbg(&spi->dev, "speed:%u\n", speed); ++ ++ rate = DIV_ROUND_UP(rs->sys_freq, speed); ++ dev_dbg(&spi->dev, "rate-1:%u\n", rate); ++ ++ if (rate > 4097) ++ return -EINVAL; ++ ++ if (rate < 2) ++ rate = 2; ++ ++ reg = mt7621_spi_read(rs, MT7621_SPI_MASTER); ++ reg &= ~(0xfff << 16); ++ reg |= (rate - 2) << 16; ++ rs->speed = speed; ++ ++ reg &= ~MT7621_LSB_FIRST; ++ if (spi->mode & SPI_LSB_FIRST) ++ reg |= MT7621_LSB_FIRST; ++ ++ reg &= ~(MT7621_CPHA | MT7621_CPOL); ++ switch(spi->mode & (SPI_CPOL | SPI_CPHA)) { ++ case SPI_MODE_0: ++ break; ++ case SPI_MODE_1: ++ reg |= MT7621_CPHA; ++ break; ++ case SPI_MODE_2: ++ reg |= MT7621_CPOL; ++ break; ++ case SPI_MODE_3: ++ reg |= MT7621_CPOL | MT7621_CPHA; ++ break; ++ } ++ mt7621_spi_write(rs, MT7621_SPI_MASTER, reg); ++ ++ return 0; ++} ++ +static inline int mt7621_spi_wait_till_ready(struct spi_device *spi) +{ + struct mt7621_spi *rs = spidev_to_mt7621_spi(spi); @@ -138,11 +203,12 @@ + return -ETIMEDOUT; +} + -+static int mt7621_spi_transfer_one_message(struct spi_master *master, ++static int mt7621_spi_transfer_half_duplex(struct spi_master *master, + struct spi_message *m) +{ + struct mt7621_spi *rs = spi_master_get_devdata(master); + struct spi_device *spi = m->spi; ++ unsigned int speed = spi->max_speed_hz; + struct spi_transfer *t = NULL; + int status = 0; + int i, len = 0; @@ -175,6 +241,10 @@ + goto msg_done; + } + ++ if (mt7621_spi_prepare(spi, speed)) { ++ status = -EIO; ++ goto msg_done; ++ } + data[0] = swab32(data[0]); + if (len < 4) + data[0] >>= (4 - len) * 8; @@ -221,21 +291,116 @@ + return 0; +} + -+static int mt7621_spi_setup(struct spi_device *spi) ++static int mt7621_spi_transfer_full_duplex(struct spi_master *master, ++ struct spi_message *m) +{ ++ struct mt7621_spi *rs = spi_master_get_devdata(master); ++ struct spi_device *spi = m->spi; ++ unsigned int speed = spi->max_speed_hz; ++ struct spi_transfer *t = NULL; ++ int status = 0; ++ int i, len = 0; ++ int rx_len = 0; ++ u32 data[9] = { 0 }; ++ u32 val = 0; ++ ++ mt7621_spi_wait_till_ready(spi); ++ ++ list_for_each_entry(t, &m->transfers, transfer_list) { ++ const u8 *buf = t->tx_buf; ++ ++ if (t->rx_buf) ++ rx_len += t->len; ++ ++ if (!buf) ++ continue; ++ ++ if (WARN_ON(len + t->len > 16)) { ++ status = -EIO; ++ goto msg_done; ++ } ++ ++ for (i = 0; i < t->len; i++, len++) ++ data[len / 4] |= buf[i] << (8 * (len & 3)); ++ } ++ ++ if (WARN_ON(rx_len > 16)) { ++ status = -EIO; ++ goto msg_done; ++ } ++ ++ if (mt7621_spi_prepare(spi, speed)) { ++ status = -EIO; ++ goto msg_done; ++ } ++ ++ for (i = 0; i < len; i += 4) ++ mt7621_spi_write(rs, MT7621_SPI_DATA0 + i, data[i / 4]); ++ ++ val |= len * 8; ++ val |= (rx_len * 8) << 12; ++ mt7621_spi_write(rs, MT7621_SPI_MOREBUF, val); ++ ++ mt7621_spi_set_cs(spi, 1); ++ ++ val = mt7621_spi_read(rs, MT7621_SPI_TRANS); ++ val |= SPI_CTL_START; ++ mt7621_spi_write(rs, MT7621_SPI_TRANS, val); ++ ++ mt7621_spi_wait_till_ready(spi); ++ ++ mt7621_spi_set_cs(spi, 0); ++ ++ for (i = 0; i < rx_len; i += 4) ++ data[i / 4] = mt7621_spi_read(rs, MT7621_SPI_DATA4 + i); ++ ++ //m->actual_length = len + rx_len; ++ m->actual_length = rx_len; ++ ++ len = 0; ++ list_for_each_entry(t, &m->transfers, transfer_list) { ++ u8 *buf = t->rx_buf; ++ ++ if (!buf) ++ continue; ++ ++ for (i = 0; i < t->len; i++, len++) ++ buf[i] = data[len / 4] >> (8 * (len & 3)); ++ } ++ ++msg_done: ++ m->status = status; ++ spi_finalize_current_message(master); ++ + return 0; +} + -+static void mt7621_spi_reset(struct mt7621_spi *rs) ++static int mt7621_spi_transfer_one_message(struct spi_master *master, ++ struct spi_message *m) +{ -+ u32 master = mt7621_spi_read(rs, MT7621_SPI_MASTER); ++ struct spi_device *spi = m->spi; ++ int cs = spi->chip_select; + -+ master &= ~(0xfff << 16); -+ master |= 13 << 16; -+ master |= 7 << 29; -+ master |= 1 << 2; ++ if (cs) ++ return mt7621_spi_transfer_full_duplex(master, m); ++ return mt7621_spi_transfer_half_duplex(master, m); ++} + -+ mt7621_spi_write(rs, MT7621_SPI_MASTER, master); ++static int mt7621_spi_setup(struct spi_device *spi) ++{ ++ struct mt7621_spi *rs = spidev_to_mt7621_spi(spi); ++ ++ if ((spi->max_speed_hz == 0) || ++ (spi->max_speed_hz > (rs->sys_freq / 2))) ++ spi->max_speed_hz = (rs->sys_freq / 2); ++ ++ if (spi->max_speed_hz < (rs->sys_freq / 4097)) { ++ dev_err(&spi->dev, "setup: requested speed is too low %d Hz\n", ++ spi->max_speed_hz); ++ return -EINVAL; ++ } ++ ++ return 0; +} + +static const struct of_device_id mt7621_spi_match[] = { @@ -279,7 +444,7 @@ + + master = spi_alloc_master(&pdev->dev, sizeof(*rs)); + if (master == NULL) { -+ dev_dbg(&pdev->dev, "master allocation failed\n"); ++ dev_info(&pdev->dev, "master allocation failed\n"); + return -ENOMEM; + } + @@ -299,12 +464,12 @@ + rs->master = master; + rs->sys_freq = clk_get_rate(rs->clk); + rs->ops = ops; -+ dev_dbg(&pdev->dev, "sys_freq: %u\n", rs->sys_freq); ++ dev_info(&pdev->dev, "sys_freq: %u\n", rs->sys_freq); + spin_lock_irqsave(&rs->lock, flags); + + device_reset(&pdev->dev); + -+ mt7621_spi_reset(rs); ++ mt7621_spi_reset(rs, 0); + + return spi_register_master(master); +} |