From 619ac8d3e582ccd806f24dcfc369c4c250ca9814 Mon Sep 17 00:00:00 2001 From: Laxman Dewangan Date: Tue, 10 Jul 2012 19:08:37 +0530 Subject: spi: tegra: use dmaengine based dma driver Use the dmaengine based Tegra APB DMA driver for data transfer between SPI FIFO and memory in place of legacy Tegra APB DMA. The new driver is selected if legacy driver is not selected and new DMA driver is enabled through config file. Signed-off-by: Laxman Dewangan Acked-by: Stephen Warren Signed-off-by: Mark Brown --- drivers/spi/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/spi/Kconfig') diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 00c024039c97..6eeb8a286a20 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -357,7 +357,7 @@ config SPI_STMP3XXX config SPI_TEGRA tristate "Nvidia Tegra SPI controller" - depends on ARCH_TEGRA && TEGRA_SYSTEM_DMA + depends on ARCH_TEGRA && (TEGRA_SYSTEM_DMA || TEGRA20_APB_DMA) help SPI driver for NVidia Tegra SoCs -- cgit v1.2.3 From b316590043372c2ca0040567a480396eb4bb2f0b Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Thu, 19 Jul 2012 18:44:07 +0200 Subject: spi: Add AD-FMCOMMS1-EBZ I2C-SPI bridge driver This patch adds support for the I2C-SPI bridge which can be found on the Analog Devices AD-FMCOMMS1-EBZ board. Signed-off-by: Lars-Peter Clausen Signed-off-by: Mark Brown --- drivers/spi/Kconfig | 7 ++ drivers/spi/Makefile | 1 + drivers/spi/spi-xcomm.c | 276 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 284 insertions(+) create mode 100644 drivers/spi/spi-xcomm.c (limited to 'drivers/spi/Kconfig') diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 0a7256924cf3..12468e5bfef8 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -384,6 +384,13 @@ config SPI_TXX9 help SPI driver for Toshiba TXx9 MIPS SoCs +config SPI_XCOMM + tristate "Analog Devices AD-FMCOMMS1-EBZ SPI-I2C-bridge driver" + depends on I2C + help + Support for the SPI-I2C bridge found on the Analog Devices + AD-FMCOMMS1-EBZ board. + config SPI_XILINX tristate "Xilinx SPI controller common module" depends on HAS_IOMEM && EXPERIMENTAL diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 9d75d2198ff5..273f50d1127a 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -61,5 +61,6 @@ obj-$(CONFIG_SPI_TI_SSP) += spi-ti-ssp.o obj-$(CONFIG_SPI_TLE62X0) += spi-tle62x0.o obj-$(CONFIG_SPI_TOPCLIFF_PCH) += spi-topcliff-pch.o obj-$(CONFIG_SPI_TXX9) += spi-txx9.o +obj-$(CONFIG_SPI_XCOMM) += spi-xcomm.o obj-$(CONFIG_SPI_XILINX) += spi-xilinx.o diff --git a/drivers/spi/spi-xcomm.c b/drivers/spi/spi-xcomm.c new file mode 100644 index 000000000000..266a847e2992 --- /dev/null +++ b/drivers/spi/spi-xcomm.c @@ -0,0 +1,276 @@ +/* + * Analog Devices AD-FMCOMMS1-EBZ board I2C-SPI bridge driver + * + * Copyright 2012 Analog Devices Inc. + * Author: Lars-Peter Clausen + * + * Licensed under the GPL-2 or later. + */ + +#include +#include +#include +#include +#include +#include +#include + +#define SPI_XCOMM_SETTINGS_LEN_OFFSET 10 +#define SPI_XCOMM_SETTINGS_3WIRE BIT(6) +#define SPI_XCOMM_SETTINGS_CS_HIGH BIT(5) +#define SPI_XCOMM_SETTINGS_SAMPLE_END BIT(4) +#define SPI_XCOMM_SETTINGS_CPHA BIT(3) +#define SPI_XCOMM_SETTINGS_CPOL BIT(2) +#define SPI_XCOMM_SETTINGS_CLOCK_DIV_MASK 0x3 +#define SPI_XCOMM_SETTINGS_CLOCK_DIV_64 0x2 +#define SPI_XCOMM_SETTINGS_CLOCK_DIV_16 0x1 +#define SPI_XCOMM_SETTINGS_CLOCK_DIV_4 0x0 + +#define SPI_XCOMM_CMD_UPDATE_CONFIG 0x03 +#define SPI_XCOMM_CMD_WRITE 0x04 + +#define SPI_XCOMM_CLOCK 48000000 + +struct spi_xcomm { + struct i2c_client *i2c; + + uint16_t settings; + uint16_t chipselect; + + unsigned int current_speed; + + uint8_t buf[63]; +}; + +static int spi_xcomm_sync_config(struct spi_xcomm *spi_xcomm, unsigned int len) +{ + uint16_t settings; + uint8_t *buf = spi_xcomm->buf; + + settings = spi_xcomm->settings; + settings |= len << SPI_XCOMM_SETTINGS_LEN_OFFSET; + + buf[0] = SPI_XCOMM_CMD_UPDATE_CONFIG; + put_unaligned_be16(settings, &buf[1]); + put_unaligned_be16(spi_xcomm->chipselect, &buf[3]); + + return i2c_master_send(spi_xcomm->i2c, buf, 5); +} + +static void spi_xcomm_chipselect(struct spi_xcomm *spi_xcomm, + struct spi_device *spi, int is_active) +{ + unsigned long cs = spi->chip_select; + uint16_t chipselect = spi_xcomm->chipselect; + + if (is_active) + chipselect |= BIT(cs); + else + chipselect &= ~BIT(cs); + + spi_xcomm->chipselect = chipselect; +} + +static int spi_xcomm_setup_transfer(struct spi_xcomm *spi_xcomm, + struct spi_device *spi, struct spi_transfer *t, unsigned int *settings) +{ + unsigned int speed; + + if ((t->bits_per_word && t->bits_per_word != 8) || t->len > 62) + return -EINVAL; + + speed = t->speed_hz ? t->speed_hz : spi->max_speed_hz; + + if (speed != spi_xcomm->current_speed) { + unsigned int divider = DIV_ROUND_UP(SPI_XCOMM_CLOCK, speed); + if (divider >= 64) + *settings |= SPI_XCOMM_SETTINGS_CLOCK_DIV_64; + else if (divider >= 16) + *settings |= SPI_XCOMM_SETTINGS_CLOCK_DIV_16; + else + *settings |= SPI_XCOMM_SETTINGS_CLOCK_DIV_4; + + spi_xcomm->current_speed = speed; + } + + if (spi->mode & SPI_CPOL) + *settings |= SPI_XCOMM_SETTINGS_CPOL; + else + *settings &= ~SPI_XCOMM_SETTINGS_CPOL; + + if (spi->mode & SPI_CPHA) + *settings &= ~SPI_XCOMM_SETTINGS_CPHA; + else + *settings |= SPI_XCOMM_SETTINGS_CPHA; + + if (spi->mode & SPI_3WIRE) + *settings |= SPI_XCOMM_SETTINGS_3WIRE; + else + *settings &= ~SPI_XCOMM_SETTINGS_3WIRE; + + return 0; +} + +static int spi_xcomm_txrx_bufs(struct spi_xcomm *spi_xcomm, + struct spi_device *spi, struct spi_transfer *t) +{ + int ret; + + if (t->tx_buf) { + spi_xcomm->buf[0] = SPI_XCOMM_CMD_WRITE; + memcpy(spi_xcomm->buf + 1, t->tx_buf, t->len); + + ret = i2c_master_send(spi_xcomm->i2c, spi_xcomm->buf, t->len + 1); + if (ret < 0) + return ret; + else if (ret != t->len + 1) + return -EIO; + } else if (t->rx_buf) { + ret = i2c_master_recv(spi_xcomm->i2c, t->rx_buf, t->len); + if (ret < 0) + return ret; + else if (ret != t->len) + return -EIO; + } + + return t->len; +} + +static int spi_xcomm_transfer_one(struct spi_master *master, + struct spi_message *msg) +{ + struct spi_xcomm *spi_xcomm = spi_master_get_devdata(master); + unsigned int settings = spi_xcomm->settings; + struct spi_device *spi = msg->spi; + unsigned cs_change = 0; + struct spi_transfer *t; + bool is_first = true; + int status = 0; + bool is_last; + + is_first = true; + + spi_xcomm_chipselect(spi_xcomm, spi, true); + + list_for_each_entry(t, &msg->transfers, transfer_list) { + + if (!t->tx_buf && !t->rx_buf && t->len) { + status = -EINVAL; + break; + } + + status = spi_xcomm_setup_transfer(spi_xcomm, spi, t, &settings); + if (status < 0) + break; + + is_last = list_is_last(&t->transfer_list, &msg->transfers); + cs_change = t->cs_change; + + if (cs_change ^ is_last) + settings |= BIT(5); + else + settings &= ~BIT(5); + + if (t->rx_buf) { + spi_xcomm->settings = settings; + status = spi_xcomm_sync_config(spi_xcomm, t->len); + if (status < 0) + break; + } else if (settings != spi_xcomm->settings || is_first) { + spi_xcomm->settings = settings; + status = spi_xcomm_sync_config(spi_xcomm, 0); + if (status < 0) + break; + } + + if (t->len) { + status = spi_xcomm_txrx_bufs(spi_xcomm, spi, t); + + if (status < 0) + break; + + if (status > 0) + msg->actual_length += status; + } + status = 0; + + if (t->delay_usecs) + udelay(t->delay_usecs); + + is_first = false; + } + + if (status != 0 || !cs_change) + spi_xcomm_chipselect(spi_xcomm, spi, false); + + msg->status = status; + spi_finalize_current_message(master); + + return status; +} + +static int spi_xcomm_setup(struct spi_device *spi) +{ + if (spi->bits_per_word != 8) + return -EINVAL; + + return 0; +} + +static int __devinit spi_xcomm_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct spi_xcomm *spi_xcomm; + struct spi_master *master; + int ret; + + master = spi_alloc_master(&i2c->dev, sizeof(*spi_xcomm)); + if (!master) + return -ENOMEM; + + spi_xcomm = spi_master_get_devdata(master); + spi_xcomm->i2c = i2c; + + master->num_chipselect = 16; + master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_3WIRE; + master->flags = SPI_MASTER_HALF_DUPLEX; + master->setup = spi_xcomm_setup; + master->transfer_one_message = spi_xcomm_transfer_one; + master->dev.of_node = i2c->dev.of_node; + i2c_set_clientdata(i2c, master); + + ret = spi_register_master(master); + if (ret < 0) + spi_master_put(master); + + return ret; +} + +static int __devexit spi_xcomm_remove(struct i2c_client *i2c) +{ + struct spi_master *master = i2c_get_clientdata(i2c); + + spi_unregister_master(master); + + return 0; +} + +static const struct i2c_device_id spi_xcomm_ids[] = { + { "spi-xcomm" }, + { }, +}; + +static struct i2c_driver spi_xcomm_driver = { + .driver = { + .name = "spi-xcomm", + .owner = THIS_MODULE, + }, + .id_table = spi_xcomm_ids, + .probe = spi_xcomm_probe, + .remove = __devexit_p(spi_xcomm_remove), +}; +module_i2c_driver(spi_xcomm_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Lars-Peter Clausen "); +MODULE_DESCRIPTION("Analog Devices AD-FMCOMMS1-EBZ board I2C-SPI bridge driver"); -- cgit v1.2.3