diff options
Diffstat (limited to 'roms/u-boot/drivers/spi/altera_spi.c')
| -rw-r--r-- | roms/u-boot/drivers/spi/altera_spi.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/spi/altera_spi.c b/roms/u-boot/drivers/spi/altera_spi.c new file mode 100644 index 000000000..fadc9f396 --- /dev/null +++ b/roms/u-boot/drivers/spi/altera_spi.c @@ -0,0 +1,209 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Altera SPI driver + * + * based on bfin_spi.c + * Copyright (c) 2005-2008 Analog Devices Inc. + * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw> + */ +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <log.h> +#include <malloc.h> +#include <fdtdec.h> +#include <spi.h> +#include <asm/io.h> +#include <linux/bitops.h> + +#define ALTERA_SPI_STATUS_RRDY_MSK BIT(7) +#define ALTERA_SPI_CONTROL_SSO_MSK BIT(10) + +#ifndef CONFIG_ALTERA_SPI_IDLE_VAL +#define CONFIG_ALTERA_SPI_IDLE_VAL 0xff +#endif + +struct altera_spi_regs { + u32 rxdata; + u32 txdata; + u32 status; + u32 control; + u32 _reserved; + u32 slave_sel; +}; + +struct altera_spi_plat { + struct altera_spi_regs *regs; +}; + +struct altera_spi_priv { + struct altera_spi_regs *regs; +}; + +static void spi_cs_activate(struct udevice *dev, uint cs) +{ + struct udevice *bus = dev->parent; + struct altera_spi_priv *priv = dev_get_priv(bus); + struct altera_spi_regs *const regs = priv->regs; + + writel(1 << cs, ®s->slave_sel); + writel(ALTERA_SPI_CONTROL_SSO_MSK, ®s->control); +} + +static void spi_cs_deactivate(struct udevice *dev) +{ + struct udevice *bus = dev->parent; + struct altera_spi_priv *priv = dev_get_priv(bus); + struct altera_spi_regs *const regs = priv->regs; + + writel(0, ®s->control); + writel(0, ®s->slave_sel); +} + +static int altera_spi_claim_bus(struct udevice *dev) +{ + struct udevice *bus = dev->parent; + struct altera_spi_priv *priv = dev_get_priv(bus); + struct altera_spi_regs *const regs = priv->regs; + + writel(0, ®s->control); + writel(0, ®s->slave_sel); + + return 0; +} + +static int altera_spi_release_bus(struct udevice *dev) +{ + struct udevice *bus = dev->parent; + struct altera_spi_priv *priv = dev_get_priv(bus); + struct altera_spi_regs *const regs = priv->regs; + + writel(0, ®s->slave_sel); + + return 0; +} + +static int altera_spi_xfer(struct udevice *dev, unsigned int bitlen, + const void *dout, void *din, unsigned long flags) +{ + struct udevice *bus = dev->parent; + struct altera_spi_priv *priv = dev_get_priv(bus); + struct altera_spi_regs *const regs = priv->regs; + struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev); + + /* assume spi core configured to do 8 bit transfers */ + unsigned int bytes = bitlen / 8; + const unsigned char *txp = dout; + unsigned char *rxp = din; + uint32_t reg, data, start; + + debug("%s: bus:%i cs:%i bitlen:%i bytes:%i flags:%lx\n", __func__, + dev_seq(bus), slave_plat->cs, bitlen, bytes, flags); + + if (bitlen == 0) + goto done; + + if (bitlen % 8) { + flags |= SPI_XFER_END; + goto done; + } + + /* empty read buffer */ + if (readl(®s->status) & ALTERA_SPI_STATUS_RRDY_MSK) + readl(®s->rxdata); + + if (flags & SPI_XFER_BEGIN) + spi_cs_activate(dev, slave_plat->cs); + + while (bytes--) { + if (txp) + data = *txp++; + else + data = CONFIG_ALTERA_SPI_IDLE_VAL; + + debug("%s: tx:%x ", __func__, data); + writel(data, ®s->txdata); + + start = get_timer(0); + while (1) { + reg = readl(®s->status); + if (reg & ALTERA_SPI_STATUS_RRDY_MSK) + break; + if (get_timer(start) > (CONFIG_SYS_HZ / 1000)) { + debug("%s: Transmission timed out!\n", __func__); + return -1; + } + } + + data = readl(®s->rxdata); + if (rxp) + *rxp++ = data & 0xff; + + debug("rx:%x\n", data); + } + +done: + if (flags & SPI_XFER_END) + spi_cs_deactivate(dev); + + return 0; +} + +static int altera_spi_set_speed(struct udevice *bus, uint speed) +{ + return 0; +} + +static int altera_spi_set_mode(struct udevice *bus, uint mode) +{ + return 0; +} + +static int altera_spi_probe(struct udevice *bus) +{ + struct altera_spi_plat *plat = dev_get_plat(bus); + struct altera_spi_priv *priv = dev_get_priv(bus); + + priv->regs = plat->regs; + + return 0; +} + +static int altera_spi_of_to_plat(struct udevice *bus) +{ + struct altera_spi_plat *plat = dev_get_plat(bus); + + plat->regs = map_physmem(dev_read_addr(bus), + sizeof(struct altera_spi_regs), + MAP_NOCACHE); + + return 0; +} + +static const struct dm_spi_ops altera_spi_ops = { + .claim_bus = altera_spi_claim_bus, + .release_bus = altera_spi_release_bus, + .xfer = altera_spi_xfer, + .set_speed = altera_spi_set_speed, + .set_mode = altera_spi_set_mode, + /* + * cs_info is not needed, since we require all chip selects to be + * in the device tree explicitly + */ +}; + +static const struct udevice_id altera_spi_ids[] = { + { .compatible = "altr,spi-1.0" }, + {} +}; + +U_BOOT_DRIVER(altera_spi) = { + .name = "altera_spi", + .id = UCLASS_SPI, + .of_match = altera_spi_ids, + .ops = &altera_spi_ops, + .of_to_plat = altera_spi_of_to_plat, + .plat_auto = sizeof(struct altera_spi_plat), + .priv_auto = sizeof(struct altera_spi_priv), + .probe = altera_spi_probe, +}; |