Signed-off-by: Wills Wang wills.wang@live.com ---

Changes in v3: None Changes in v2: None

drivers/spi/Kconfig | 6 ++ drivers/spi/Makefile | 1 + drivers/spi/ath79_spi.c | 211 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 218 insertions(+) create mode 100644 drivers/spi/ath79_spi.c

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 2cdb110..04a24ab 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -23,6 +23,12 @@ config ALTERA_SPI IP core. Please find details on the "Embedded Peripherals IP User Guide" of Altera.

+config ATH79_SPI + bool "Atheros SPI driver" + help + Enable the Atheros SPI driver, used to access SPI NOR flash and + other SPI peripherals on Atheros ar7xxx/ar9xxx SoCs. + config CADENCE_QSPI bool "Cadence QSPI driver" help diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 3eca745..7fb2926 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -17,6 +17,7 @@ endif

obj-$(CONFIG_ALTERA_SPI) += altera_spi.o obj-$(CONFIG_ARMADA100_SPI) += armada100_spi.o +obj-$(CONFIG_ATH79_SPI) += ath79_spi.o obj-$(CONFIG_ATMEL_DATAFLASH_SPI) += atmel_dataflash_spi.o obj-$(CONFIG_ATMEL_SPI) += atmel_spi.o obj-$(CONFIG_BFIN_SPI) += bfin_spi.o diff --git a/drivers/spi/ath79_spi.c b/drivers/spi/ath79_spi.c new file mode 100644 index 0000000..ddfc807 --- /dev/null +++ b/drivers/spi/ath79_spi.c @@ -0,0 +1,211 @@ +/* + * (C) Copyright 2015 + * Wills Wang, wills.wang@live.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <spi.h> +#include <dm.h> +#include <errno.h> +#include <asm/io.h> +#include <asm/addrspace.h> +#include <asm/types.h> +#include <asm/arch/ar71xx_regs.h> + +/* CLOCK_DIVIDER = 3 (SPI clock = 200 / 8 ~ 25 MHz) */ +#define SPI_CLK_DIV(x) ((x >> 1) - 1) + +struct ath79_spi_platdata { + void __iomem *regs; +}; + +struct ath79_spi_priv { + void __iomem *regs; +}; + +static inline u32 ath79_spi_read(struct udevice *bus, u32 offset) +{ + struct ath79_spi_priv *priv = dev_get_priv(bus); + const void __iomem *base = (void __iomem *)KSEG1ADDR(priv->regs); + return readl(base + offset); +} + +static inline void ath79_spi_write(struct udevice *bus, u32 val, + u32 offset) +{ + struct ath79_spi_priv *priv = dev_get_priv(bus); + const void __iomem *base = (void __iomem *)KSEG1ADDR(priv->regs); + writel(val, base + offset); +} + +static int ath79_spi_claim_bus(struct udevice *dev) +{ + return 0; +} + +static int ath79_spi_release_bus(struct udevice *dev) +{ + return 0; +} + +static int ath79_spi_xfer(struct udevice *dev, unsigned int bitlen, + const void *dout, void *din, unsigned long flags) +{ + struct udevice *bus = dev->parent; + struct dm_spi_slave_platdata *slave = dev_get_parent_platdata(dev); + uint8_t *rx = din; + const uint8_t *tx = dout; + uint8_t curbyte, curbitlen, restbits; + uint32_t bytes = bitlen / 8; + uint32_t out; + uint32_t in; + + if (flags & SPI_XFER_BEGIN) { + ath79_spi_write(bus, AR71XX_SPI_FS_GPIO, AR71XX_SPI_REG_FS); + ath79_spi_write(bus, AR71XX_SPI_IOC_CS_ALL, AR71XX_SPI_REG_IOC); + } + + restbits = (bitlen % 8); + if (restbits) + bytes++; + + /* enable chip select */ + out = AR71XX_SPI_IOC_CS_ALL & ~(AR71XX_SPI_IOC_CS(slave->cs)); + while (bytes--) { + curbyte = 0; + if (tx) + curbyte = *tx++; + + if (restbits) { + curbitlen = restbits; + curbyte <<= 8 - restbits; + } else { + curbitlen = 8; + } + + /* clock starts at inactive polarity */ + for (curbyte <<= (8 - curbitlen); curbitlen; curbitlen--) { + if (curbyte & 0x80) + out |= AR71XX_SPI_IOC_DO; + else + out &= ~(AR71XX_SPI_IOC_DO); + + /* setup MSB (to slave) on trailing edge */ + ath79_spi_write(bus, out, AR71XX_SPI_REG_IOC); + ath79_spi_write(bus, out | AR71XX_SPI_IOC_CLK, + AR71XX_SPI_REG_IOC); + curbyte <<= 1; + } + + in = ath79_spi_read(bus, AR71XX_SPI_REG_RDS); + if (rx) { + if (restbits) + *rx++ = (in << (8 - restbits)); + else + *rx++ = in; + } + } + + if (flags & SPI_XFER_END) { + ath79_spi_write(bus, AR71XX_SPI_IOC_CS(slave->cs), + AR71XX_SPI_REG_IOC); + ath79_spi_write(bus, AR71XX_SPI_IOC_CS_ALL, AR71XX_SPI_REG_IOC); + ath79_spi_write(bus, 0, AR71XX_SPI_REG_FS); + } + + return 0; +} + + +static int ath79_spi_set_speed(struct udevice *bus, uint speed) +{ + u32 val, div = 0; + + if (speed) + div = 200000000 / speed; + + if (div > 63) + div = 63; + + if (div < 5) + div = 5; + + ath79_spi_write(bus, AR71XX_SPI_FS_GPIO, AR71XX_SPI_REG_FS); + val = ath79_spi_read(bus, AR71XX_SPI_REG_CTRL); + val &= ~AR71XX_SPI_CTRL_DIV_MASK; + val |= SPI_CLK_DIV(div); + ath79_spi_write(bus, val, AR71XX_SPI_REG_CTRL); + ath79_spi_write(bus, 0, AR71XX_SPI_REG_FS); + return 0; +} + +static int ath79_spi_set_mode(struct udevice *bus, uint mode) +{ + return 0; +} + +static int ath79_spi_probe(struct udevice *bus) +{ + struct ath79_spi_priv *priv = dev_get_priv(bus); + struct ath79_spi_platdata *plat = dev_get_platdata(bus); + + priv->regs = plat->regs; + + /* Init SPI Hardware, disable remap, set clock */ + ath79_spi_write(bus, AR71XX_SPI_FS_GPIO, AR71XX_SPI_REG_FS); + ath79_spi_write(bus, AR71XX_SPI_CTRL_RD | SPI_CLK_DIV(8), + AR71XX_SPI_REG_CTRL); + ath79_spi_write(bus, 0, AR71XX_SPI_REG_FS); + + return 0; +} + +static int ath79_cs_info(struct udevice *bus, uint cs, + struct spi_cs_info *info) +{ + /* Always allow activity on CS 0/1/2 */ + if (cs >= 3) + return -ENODEV; + + return 0; +} + +static int ath79_spi_ofdata_to_platdata(struct udevice *bus) +{ + struct ath79_spi_platdata *plat = dev_get_platdata(bus); + fdt_addr_t addr; + + addr = dev_get_addr(bus); + if (addr == FDT_ADDR_T_NONE) + return -EINVAL; + + plat->regs = (void __iomem *)addr; + return 0; +} + +static const struct dm_spi_ops ath79_spi_ops = { + .claim_bus = ath79_spi_claim_bus, + .release_bus = ath79_spi_release_bus, + .xfer = ath79_spi_xfer, + .set_speed = ath79_spi_set_speed, + .set_mode = ath79_spi_set_mode, + .cs_info = ath79_cs_info, +}; + +static const struct udevice_id ath79_spi_ids[] = { + { .compatible = "ath79,ath79-spi" }, + {} +}; + +U_BOOT_DRIVER(ath79_spi) = { + .name = "ath79_spi", + .id = UCLASS_SPI, + .of_match = ath79_spi_ids, + .ops = &ath79_spi_ops, + .ofdata_to_platdata = ath79_spi_ofdata_to_platdata, + .platdata_auto_alloc_size = sizeof(struct ath79_spi_platdata), + .priv_auto_alloc_size = sizeof(struct ath79_spi_priv), + .probe = ath79_spi_probe, +};