From: Nick Hawkins Date: Wed, 8 Jun 2022 21:21:36 +0000 (-0500) Subject: spi: gxp_spi: Add GXP SPI controller driver X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=4f689b3d86be92625ec0593779590ab5ccfd8171;p=u-boot.git spi: gxp_spi: Add GXP SPI controller driver The GXP supports 3 separate SPI interfaces to accommodate the system flash, core flash, and other functions. The SPI engine supports variable clock frequency, selectable 3-byte or 4-byte addressing and a configurable x1, x2, and x4 command/address/data modes. The memory buffer for reading and writing ranges between 256 bytes and 8KB. This driver supports access to the core flash. Signed-off-by: Nick Hawkins --- diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index a1e515cb2b..e48d72d744 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -186,6 +186,12 @@ config FSL_QSPI_AHB_FULL_MAP Enable the Freescale QSPI driver to use full AHB memory map space for flash access. +config GXP_SPI + bool "SPI driver for GXP" + imply SPI_FLASH_BAR + help + Enable support for SPI on GXP. + config ICH_SPI bool "Intel ICH SPI driver" help diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 06e81b465b..8755408e62 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -33,6 +33,7 @@ obj-$(CONFIG_EXYNOS_SPI) += exynos_spi.o obj-$(CONFIG_FSL_DSPI) += fsl_dspi.o obj-$(CONFIG_FSL_ESPI) += fsl_espi.o obj-$(CONFIG_SYNQUACER_SPI) += spi-synquacer.o +obj-$(CONFIG_GXP_SPI) += gxp_spi.o obj-$(CONFIG_ICH_SPI) += ich.o obj-$(CONFIG_IPROC_QSPI) += iproc_qspi.o obj-$(CONFIG_KIRKWOOD_SPI) += kirkwood_spi.o diff --git a/drivers/spi/gxp_spi.c b/drivers/spi/gxp_spi.c new file mode 100644 index 0000000000..70d76ac66a --- /dev/null +++ b/drivers/spi/gxp_spi.c @@ -0,0 +1,304 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * GXP SPI driver + * + * (C) Copyright 2022 Hewlett Packard Enterprise Development LP. + * Author: Nick Hawkins + * Author: Jean-Marie Verdun + */ + +#include +#include +#include + +#define GXP_SPI0_MAX_CHIPSELECT 2 + +#define MANUAL_MODE 0 +#define AUTO_MODE 1 +#define OFFSET_SPIMCFG 0x00 +#define OFFSET_SPIMCTRL 0x04 +#define OFFSET_SPICMD 0x05 +#define OFFSET_SPIDCNT 0x06 +#define OFFSET_SPIADDR 0x08 +#define OFFSET_SPILDAT 0x40 +#define GXP_SPILDAT_SIZE 64 + +#define SPIMCTRL_START 0x01 +#define SPIMCTRL_BUSY 0x02 + +#define CMD_READ_ARRAY_FAST 0x0b + +struct gxp_spi_priv { + struct spi_slave slave; + void __iomem *base; + unsigned int mode; + +}; + +static void spi_set_mode(struct gxp_spi_priv *priv, int mode) +{ + unsigned char value; + + value = readb(priv->base + OFFSET_SPIMCTRL); + if (mode == MANUAL_MODE) { + writeb(0x55, priv->base + OFFSET_SPICMD); + writeb(0xaa, priv->base + OFFSET_SPICMD); + /* clear bit5 and bit4, auto_start and start_mask */ + value &= ~(0x03 << 4); + } else { + value |= (0x03 << 4); + } + writeb(value, priv->base + OFFSET_SPIMCTRL); +} + +static int gxp_spi_xfer(struct udevice *dev, unsigned int bitlen, const void *dout, void *din, + unsigned long flags) +{ + struct gxp_spi_priv *priv = dev_get_priv(dev->parent); + struct spi_slave *slave = dev_get_parent_priv(dev); + struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev); + + unsigned int len = bitlen / 8; + unsigned int value; + unsigned int addr = 0; + unsigned char uchar_out[len]; + unsigned char *uchar_in = (unsigned char *)din; + int read_len; + int read_ptr; + + if (dout && din) { + /* + * error: gxp spi engin cannot send data to dout and read data from din at the same + * time + */ + return -1; + } + + memset(uchar_out, 0, sizeof(uchar_out)); + if (dout) + memcpy(uchar_out, dout, len); + + if (flags & SPI_XFER_BEGIN) { + /* the dout is cmd + addr, cmd=dout[0], add1~3=dout[1~3]. */ + /* cmd reg */ + writeb(uchar_out[0], priv->base + OFFSET_SPICMD); + + /* config reg */ + value = readl(priv->base + OFFSET_SPIMCFG); + value &= ~(1 << 24); + /* set chipselect */ + value |= (slave_plat->cs << 24); + + /* addr reg and addr size */ + if (len >= 4) { + addr = uchar_out[1] << 16 | uchar_out[2] << 8 | uchar_out[3]; + writel(addr, priv->base + OFFSET_SPIADDR); + value &= ~(0x07 << 16); + /* set the address size to 3 byte */ + value |= (3 << 16); + } else { + writel(0, priv->base + OFFSET_SPIADDR); + /* set the address size to 0 byte */ + value &= ~(0x07 << 16); + } + + /* dummy */ + /* clear dummy_cnt to */ + value &= ~(0x1f << 19); + if (uchar_out[0] == CMD_READ_ARRAY_FAST) { + /* fast read needs 8 dummy clocks */ + value |= (8 << 19); + } + + writel(value, priv->base + OFFSET_SPIMCFG); + + if (flags & SPI_XFER_END) { + /* no data cmd just start it */ + /* set the data direction bit to 1 */ + value = readb(priv->base + OFFSET_SPIMCTRL); + value |= (1 << 3); + writeb(value, priv->base + OFFSET_SPIMCTRL); + + /* set the data byte count */ + writeb(0, priv->base + OFFSET_SPIDCNT); + + /* set the start bit */ + value = readb(priv->base + OFFSET_SPIMCTRL); + value |= SPIMCTRL_START; + writeb(value, priv->base + OFFSET_SPIMCTRL); + + /* wait busy bit is cleared */ + do { + value = readb(priv->base + OFFSET_SPIMCTRL); + } while (value & SPIMCTRL_BUSY); + return 0; + } + } + + if (!(flags & SPI_XFER_END) && (flags & SPI_XFER_BEGIN)) { + /* first of spi_xfer calls */ + return 0; + } + + /* if dout != null, write data to buf and start transaction */ + if (dout) { + if (len > slave->max_write_size) { + printf("SF: write length is too big(>%d)\n", slave->max_write_size); + return -1; + } + + /* load the data bytes */ + memcpy((u8 *)priv->base + OFFSET_SPILDAT, dout, len); + + /* write: set the data direction bit to 1 */ + value = readb(priv->base + OFFSET_SPIMCTRL); + value |= (1 << 3); + writeb(value, priv->base + OFFSET_SPIMCTRL); + + /* set the data byte count */ + writeb(len, priv->base + OFFSET_SPIDCNT); + + /* set the start bit */ + value = readb(priv->base + OFFSET_SPIMCTRL); + value |= SPIMCTRL_START; + writeb(value, priv->base + OFFSET_SPIMCTRL); + + /* wait busy bit is cleared */ + do { + value = readb(priv->base + OFFSET_SPIMCTRL); + } while (value & SPIMCTRL_BUSY); + + return 0; + } + + /* if din !=null, start and read data */ + if (uchar_in) { + read_ptr = 0; + + while (read_ptr < len) { + read_len = len - read_ptr; + if (read_len > GXP_SPILDAT_SIZE) + read_len = GXP_SPILDAT_SIZE; + + /* read: set the data direction bit to 0 */ + value = readb(priv->base + OFFSET_SPIMCTRL); + value &= ~(1 << 3); + writeb(value, priv->base + OFFSET_SPIMCTRL); + + /* set the data byte count */ + writeb(read_len, priv->base + OFFSET_SPIDCNT); + + /* set the start bit */ + value = readb(priv->base + OFFSET_SPIMCTRL); + value |= SPIMCTRL_START; + writeb(value, priv->base + OFFSET_SPIMCTRL); + + /* wait busy bit is cleared */ + do { + value = readb(priv->base + OFFSET_SPIMCTRL); + } while (value & SPIMCTRL_BUSY); + + /* store the data bytes */ + memcpy(uchar_in + read_ptr, (u8 *)priv->base + OFFSET_SPILDAT, read_len); + /* update read_ptr and addr reg */ + read_ptr += read_len; + + addr = readl(priv->base + OFFSET_SPIADDR); + addr += read_len; + writel(addr, priv->base + OFFSET_SPIADDR); + } + + return 0; + } + return -2; +} + +static int gxp_spi_set_speed(struct udevice *dev, unsigned int speed) +{ + /* Accept any speed */ + return 0; +} + +static int gxp_spi_set_mode(struct udevice *dev, unsigned int mode) +{ + struct gxp_spi_priv *priv = dev_get_priv(dev->parent); + + priv->mode = mode; + + return 0; +} + +static int gxp_spi_claim_bus(struct udevice *dev) +{ + struct gxp_spi_priv *priv = dev_get_priv(dev->parent); + unsigned char cmd; + + spi_set_mode(priv, MANUAL_MODE); + + /* exit 4 bytes addr mode, uboot spi_flash only supports 3 byets address mode */ + cmd = 0xe9; + gxp_spi_xfer(dev, 1 * 8, &cmd, NULL, SPI_XFER_BEGIN | SPI_XFER_END); + return 0; +} + +static int gxp_spi_release_bus(struct udevice *dev) +{ + struct gxp_spi_priv *priv = dev_get_priv(dev->parent); + + spi_set_mode(priv, AUTO_MODE); + + return 0; +} + +int gxp_spi_cs_info(struct udevice *bus, unsigned int cs, struct spi_cs_info *info) +{ + if (cs < GXP_SPI0_MAX_CHIPSELECT) + return 0; + else + return -ENODEV; +} + +static int gxp_spi_probe(struct udevice *bus) +{ + struct gxp_spi_priv *priv = dev_get_priv(bus); + + priv->base = dev_read_addr_ptr(bus); + if (!priv->base) + return -ENOENT; + + return 0; +} + +static int gxp_spi_child_pre_probe(struct udevice *dev) +{ + struct spi_slave *slave = dev_get_parent_priv(dev); + + slave->max_write_size = GXP_SPILDAT_SIZE; + + return 0; +} + +static const struct dm_spi_ops gxp_spi_ops = { + .claim_bus = gxp_spi_claim_bus, + .release_bus = gxp_spi_release_bus, + .xfer = gxp_spi_xfer, + .set_speed = gxp_spi_set_speed, + .set_mode = gxp_spi_set_mode, + .cs_info = gxp_spi_cs_info, +}; + +static const struct udevice_id gxp_spi_ids[] = { + { .compatible = "hpe,gxp-spi" }, + { } +}; + +U_BOOT_DRIVER(gxp_spi) = { + .name = "gxp_spi", + .id = UCLASS_SPI, + .of_match = gxp_spi_ids, + .ops = &gxp_spi_ops, + .priv_auto = sizeof(struct gxp_spi_priv), + .probe = gxp_spi_probe, + .child_pre_probe = gxp_spi_child_pre_probe, +}; +