[U-Boot] [PATCH v2 2/3] spi: zynqmp_qspi: Add QSPI driver support for ZynqMP
Michal Simek
michal.simek at xilinx.com
Thu May 26 13:02:10 CEST 2016
On 26.5.2016 08:58, Siva Durga Prasad Paladugu wrote:
> This adds QSPI driver support for ZynqMP platform
> This driver supports all spi flash commands in
> qspi single mode.
>
> Signed-off-by: Siva Durga Prasad Paladugu <sivadur at xilinx.com>
> ---
> Changes for v2:
> - set no_all_quad as zynqmp qspi
> controller doesnt support it
> ---
> drivers/spi/Kconfig | 9 +
> drivers/spi/Makefile | 1 +
> drivers/spi/zynqmp_qspi.c | 705 +++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 715 insertions(+), 0 deletions(-)
> create mode 100644 drivers/spi/zynqmp_qspi.c
>
> diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
> index f0258f8..25a98a6 100644
> --- a/drivers/spi/Kconfig
> +++ b/drivers/spi/Kconfig
> @@ -155,6 +155,15 @@ config ZYNQ_QSPI
> Zynq QSPI IP core. This IP is used to connect the flash in
> 4-bit qspi, 8-bit dual stacked and shared 4-bit dual parallel.
>
> +config ZYNQMP_QSPI
> + bool "ZynqMP QSPI driver"
> + depends on ARCH_ZYNQMP
> + help
> + Enable the ZynqMP Quad-SPI (QSPI) driver. This driver can be
> + used to access the SPI NOR flash on platforms embedding this
> + ZynqMP QSPI IP core. This IP is used to connect the flash in
> + 4-bit qspi, 8-bit dual stacked and shared 4-bit dual parallel.
> +
> config OMAP3_SPI
> bool "McSPI driver for OMAP"
> help
> diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
> index 3eca745..b47103f 100644
> --- a/drivers/spi/Makefile
> +++ b/drivers/spi/Makefile
> @@ -51,3 +51,4 @@ obj-$(CONFIG_TI_QSPI) += ti_qspi.o
> obj-$(CONFIG_XILINX_SPI) += xilinx_spi.o
> obj-$(CONFIG_ZYNQ_SPI) += zynq_spi.o
> obj-$(CONFIG_ZYNQ_QSPI) += zynq_qspi.o
> +obj-$(CONFIG_ZYNQMP_QSPI) += zynqmp_qspi.o
> diff --git a/drivers/spi/zynqmp_qspi.c b/drivers/spi/zynqmp_qspi.c
> new file mode 100644
> index 0000000..93ace51
> --- /dev/null
> +++ b/drivers/spi/zynqmp_qspi.c
> @@ -0,0 +1,705 @@
> +/*
> + * Xilinx ZynqMP Quad-SPI(QSPI) Controller Driver
> + *
> + * (C) Copyright 2016 Xilinx, Inc
> + * Siva Durga Prasad <siva.durga.paladugu at xilinx.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <memalign.h>
> +#include <ubi_uboot.h>
> +#include <spi.h>
> +#include <spi_flash.h>
> +#include <asm/io.h>
> +#include "../mtd/spi/sf_internal.h"
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +/*
> + * QSPI Config Register bit Masks
> + */
> +#define ZYNQMP_QSPI_CONFIG_STRT_MODE_MASK BIT(29)
> +#define ZYNQMP_QSPI_CONFIG_MODE_EN_MASK GENMASK(31, 30)
> +#define ZYNQMP_QSPI_CONFIG_DMA_MODE BIT(31)
> +#define ZYNQMP_QSPI_CONFIG_CPHA_MASK BIT(2)
> +#define ZYNQMP_QSPI_CONFIG_CPOL_MASK BIT(1)
> +#define ZYNQMP_QSPI_CONFIG_GFIFO_WP_HOLD BIT(19)
> +#define ZYNQMP_QSPI_CONFIG_BAUD_DIV_MASK GENMASK(5, 3)
> +#define ZYNQMP_QSPI_CONFIG_DFLT_BAUD_RATE_DIV BIT(3)
> +
> +/*
> + * QSPI Interrupt Registers bit Masks
> + */
> +#define ZYNQMP_QSPI_IXR_TXNFULL_MASK BIT(2)
> +#define ZYNQMP_QSPI_IXR_TXFULL_MASK BIT(3)
> +#define ZYNQMP_QSPI_IXR_RXNEMTY_MASK BIT(4)
> +#define ZYNQMP_QSPI_IXR_GFEMTY_MASK BIT(7)
> +#define ZYNQMP_QSPI_IXR_ALL_MASK (ZYNQMP_QSPI_IXR_TXNFULL_MASK | \
> + ZYNQMP_QSPI_IXR_RXNEMTY_MASK)
> +#define ZYNQMP_QSPI_GFIFO_ALL_INT_MASK 0xFBE
> +
> +/*
> + * QSPI Enable Register bit Masks
> + */
> +#define ZYNQMP_QSPI_ENABLE_ENABLE_MASK BIT(0)
> +
> +/*
> + * QSPI Generic FIFO register bit masks
> + */
> +#define ZYNQMP_QSPI_GFIFO_LOW_BUS BIT(14)
> +#define ZYNQMP_QSPI_GFIFO_CS_LOWER BIT(12)
> +#define ZYNQMP_QSPI_GFIFO_UP_BUS BIT(15)
> +#define ZYNQMP_QSPI_GFIFO_CS_UPPER BIT(13)
> +#define ZYNQMP_QSPI_GFIFO_SPI_MODE_QSPI GENMASK(11, 10)
> +#define ZYNQMP_QSPI_GFIFO_SPI_MODE_SPI BIT(10)
> +#define ZYNQMP_QSPI_GFIFO_TX BIT(16)
> +#define ZYNQMP_QSPI_GFIFO_RX BIT(17)
> +#define ZYNQMP_QSPI_GFIFO_STRIPE_MASK BIT(18)
> +#define ZYNQMP_QSPI_GFIFO_IMD_MASK GENMASK(7, 0)
> +#define ZYNQMP_QSPI_GFIFO_EXP_MASK BIT(9)
> +#define ZYNQMP_QSPI_GFIFO_DATA_XFR_MASK BIT(8)
> +
> +#define ZYNQMP_QSPI_GFIFO_IMD_DATA_CS_ASSERT 5
> +#define ZYNQMP_QSPI_GFIFO_IMD_DATA_CS_DEASSERT 5
> +#define ZYNQMP_QSPI_GFIFO_EXP_INIT_VAL 8
> +#define ZYNQMP_QSPI_GFIFO_IMD_MAX_DATA_LEN 255
> +/*
> + * QSPI DMA Destination status register bit masks
> + */
> +#define ZYNQMP_QSPI_DMA_DST_I_STS_DONE BIT(1)
> +#define ZYNQMP_QSPI_DMA_DST_I_STS_MASK GENMASK(7, 1)
> +
> +/*
> + * QSPI Generic QSPI selection register bit mask
> + */
> +#define ZYNQMP_QSPI_GQSPI_SELECT BIT(0)
> +
> +#define ZYNQMP_QSPI_FIFO_THRESHOLD 1
> +
> +#define SPI_XFER_ON_BOTH 0
> +#define SPI_XFER_ON_LOWER 1
> +#define SPI_XFER_ON_UPPER 2
> +
> +#define ZYNQMP_QSPI_DMA_ALIGN 0x4
> +#define ZYNQMP_QSPI_DMA_POLL_TIMEOUT 10000000
> +
> +#define ZYNQMP_QSPI_GENERIC_BASEADDR_OFFSET 0x100
> +#define ZYNQMP_QSPI_GENERIC_DMABASE_OFFSET 0x800
> +
> +/* QSPI register offsets */
> +struct zynqmp_qspi_regs {
> + u32 confr; /* 0x00 */
> + u32 isr; /* 0x04 */
> + u32 ier; /* 0x08 */
> + u32 idisr; /* 0x0C */
> + u32 imaskr; /* 0x10 */
> + u32 enbr; /* 0x14 */
> + u32 dr; /* 0x18 */
> + u32 txd0r; /* 0x1C */
> + u32 drxr; /* 0x20 */
> + u32 sicr; /* 0x24 */
> + u32 txftr; /* 0x28 */
> + u32 rxftr; /* 0x2C */
> + u32 gpior; /* 0x30 */
> + u32 reserved0; /* 0x34 */
> + u32 lpbkdly; /* 0x38 */
> + u32 reserved1; /* 0x3C */
> + u32 genfifo; /* 0x40 */
> + u32 gqspisel; /* 0x44 */
> + u32 reserved2; /* 0x48 */
> + u32 gqfifoctrl; /* 0x4C */
> + u32 gqfthr; /* 0x50 */
> + u32 gqpollcfg; /* 0x54 */
> + u32 gqpollto; /* 0x58 */
> + u32 gqxfersts; /* 0x5C */
> + u32 gqfifosnap; /* 0x60 */
> + u32 gqrxcpy; /* 0x64 */
> +};
> +
> +struct zynqmp_qspi_dma_regs {
> + u32 dmadst; /* 0x00 */
> + u32 dmasize; /* 0x04 */
> + u32 dmasts; /* 0x08 */
> + u32 dmactrl; /* 0x0C */
> + u32 reserved0; /* 0x10 */
> + u32 dmaisr; /* 0x14 */
> + u32 dmaier; /* 0x18 */
> + u32 dmaidr; /* 0x1C */
> + u32 dmaimr; /* 0x20 */
> + u32 dmactrl2; /* 0x24 */
> + u32 dmadstmsb; /* 0x28 */
> +};
> +
> +struct zynqmp_qspi_platdata {
> + struct zynqmp_qspi_regs *regs;
> + struct zynqmp_qspi_dma_regs *dma_regs;
> + u32 frequency;
> + u32 speed_hz;
> +};
> +
> +struct zynqmp_qspi_priv {
> + struct zynqmp_qspi_regs *regs;
> + struct zynqmp_qspi_dma_regs *dma_regs;
> + u8 mode;
> + u32 freq;
> + const void *tx_buf;
> + void *rx_buf;
> + unsigned len;
> + int bytes_to_transfer;
> + int bytes_to_receive;
> + unsigned int is_inst;
> + unsigned int is_dual;
> + unsigned int u_page;
> + unsigned int bus;
> + unsigned int stripe;
> + unsigned cs_change:1;
> +};
> +
> +static u8 last_cmd;
> +
> +static int zynqmp_qspi_ofdata_to_platdata(struct udevice *bus)
> +{
> + struct zynqmp_qspi_platdata *plat = bus->platdata;
> + const void *blob = gd->fdt_blob;
> + int node = bus->of_offset;
> +
> + debug("%s\n", __func__);
> +
> + plat->regs = (struct zynqmp_qspi_regs *)(dev_get_addr(bus) +
> + ZYNQMP_QSPI_GENERIC_BASEADDR_OFFSET);
> + plat->dma_regs = (struct zynqmp_qspi_dma_regs *)(dev_get_addr(bus) +
> + ZYNQMP_QSPI_GENERIC_DMABASE_OFFSET);
> +
> + plat->frequency = fdtdec_get_int(blob, node, "spi-max-frequency",
> + 166666666);
> + plat->speed_hz = plat->frequency / 2;
> +
> + return 0;
> +}
> +
> +static void zynqmp_qspi_init_hw(struct zynqmp_qspi_priv *priv)
> +{
> + u32 config_reg;
> + struct zynqmp_qspi_regs *regs = priv->regs;
> +
> + writel(ZYNQMP_QSPI_GQSPI_SELECT, ®s->gqspisel);
> + writel(ZYNQMP_QSPI_GFIFO_ALL_INT_MASK, ®s->idisr);
> + writel(ZYNQMP_QSPI_FIFO_THRESHOLD, ®s->txftr);
> + writel(ZYNQMP_QSPI_FIFO_THRESHOLD, ®s->rxftr);
> + writel(ZYNQMP_QSPI_GFIFO_ALL_INT_MASK, ®s->isr);
> +
> + config_reg = readl(®s->confr);
> + config_reg &= ~(ZYNQMP_QSPI_CONFIG_STRT_MODE_MASK |
> + ZYNQMP_QSPI_CONFIG_MODE_EN_MASK);
> + config_reg |= ZYNQMP_QSPI_CONFIG_DMA_MODE |
> + ZYNQMP_QSPI_CONFIG_GFIFO_WP_HOLD |
> + ZYNQMP_QSPI_CONFIG_DFLT_BAUD_RATE_DIV;
> + writel(config_reg, ®s->confr);
> +
> + writel(ZYNQMP_QSPI_ENABLE_ENABLE_MASK, ®s->enbr);
> +}
> +
> +static u32 zynqmp_qspi_bus_select(struct zynqmp_qspi_priv *priv)
> +{
> + u32 gqspi_fifo_reg = 0;
> +
> + gqspi_fifo_reg = ZYNQMP_QSPI_GFIFO_LOW_BUS |
> + ZYNQMP_QSPI_GFIFO_CS_LOWER;
> +
> + return gqspi_fifo_reg;
> +}
> +
> +static void zynqmp_qspi_fill_gen_fifo(struct zynqmp_qspi_priv *priv,
> + u32 gqspi_fifo_reg)
> +{
> + struct zynqmp_qspi_regs *regs = priv->regs;
> + u32 reg;
> +
> + do {
> + reg = readl(®s->isr);
> + } while (!(reg & ZYNQMP_QSPI_IXR_GFEMTY_MASK));
> +
> + writel(gqspi_fifo_reg, ®s->genfifo);
> +}
> +
> +static void zynqmp_qspi_chipselect(struct zynqmp_qspi_priv *priv, int is_on)
> +{
> + u32 gqspi_fifo_reg = 0;
> +
> + if (is_on) {
> + gqspi_fifo_reg = zynqmp_qspi_bus_select(priv);
> + gqspi_fifo_reg |= ZYNQMP_QSPI_GFIFO_SPI_MODE_SPI |
> + ZYNQMP_QSPI_GFIFO_IMD_DATA_CS_ASSERT;
> + } else {
> + gqspi_fifo_reg = ZYNQMP_QSPI_GFIFO_LOW_BUS;
> + gqspi_fifo_reg |= ZYNQMP_QSPI_GFIFO_IMD_DATA_CS_DEASSERT;
> + }
> +
> + debug("GFIFO_CMD_CS: 0x%x\n", gqspi_fifo_reg);
> +
> + zynqmp_qspi_fill_gen_fifo(priv, gqspi_fifo_reg);
> +}
> +
> +static int zynqmp_qspi_set_speed(struct udevice *bus, uint speed)
> +{
> + struct zynqmp_qspi_platdata *plat = bus->platdata;
> + struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
> + struct zynqmp_qspi_regs *regs = priv->regs;
> + uint32_t confr;
> + u8 baud_rate_val = 0;
> +
> + debug("%s\n", __func__);
> + if (speed > plat->frequency)
> + speed = plat->frequency;
> +
> + /* Set the clock frequency */
> + confr = readl(®s->confr);
> + if (speed == 0) {
> + /* Set divisor 8, if the freq is 0 */
> + baud_rate_val = 0x2;
> + } else if (plat->speed_hz != speed) {
> + while ((baud_rate_val < 8) &&
> + ((plat->frequency /
> + (2 << baud_rate_val)) > speed))
> + baud_rate_val++;
> +
> + plat->speed_hz = speed / (2 << baud_rate_val);
> + }
> + confr &= ~ZYNQMP_QSPI_CONFIG_BAUD_DIV_MASK;
> + confr |= (baud_rate_val << 3);
> + writel(confr, ®s->confr);
> +
> + priv->freq = speed;
> +
> + debug("regs=%p, mode=%d\n", priv->regs, priv->freq);
> +
> + return 0;
> +}
> +
> +static int zynqmp_qspi_child_pre_probe(struct udevice *bus)
> +{
> + struct spi_slave *slave = dev_get_parent_priv(bus);
> +
> + slave->mode_rx = QUAD_OUTPUT_FAST;
> + slave->mode = SPI_TX_QUAD;
> + slave->no_all_quad = 1;
> +
> + return 0;
> +}
> +
> +static int zynqmp_qspi_probe(struct udevice *bus)
> +{
> + struct zynqmp_qspi_platdata *plat = dev_get_platdata(bus);
> + struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
> +
> + debug("zynqmp_qspi_probe: bus:%p, priv:%p\n", bus, priv);
> +
> + priv->regs = plat->regs;
> + priv->dma_regs = plat->dma_regs;
> +
> + /* init the zynq spi hw */
> + zynqmp_qspi_init_hw(priv);
> +
> + return 0;
> +}
> +
> +static int zynqmp_qspi_set_mode(struct udevice *bus, uint mode)
> +{
> + struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
> + struct zynqmp_qspi_regs *regs = priv->regs;
> + uint32_t confr;
> +
> + debug("%s\n", __func__);
> + /* Set the SPI Clock phase and polarities */
> + confr = readl(®s->confr);
> + confr &= ~(ZYNQMP_QSPI_CONFIG_CPHA_MASK |
> + ZYNQMP_QSPI_CONFIG_CPOL_MASK);
> +
> + if (priv->mode & SPI_CPHA)
> + confr |= ZYNQMP_QSPI_CONFIG_CPHA_MASK;
> + if (priv->mode & SPI_CPOL)
> + confr |= ZYNQMP_QSPI_CONFIG_CPOL_MASK;
> +
> + priv->mode = mode;
> +
> + debug("regs=%p, mode=%d\n", priv->regs, priv->mode);
> +
> + return 0;
> +}
> +
> +static int zynqmp_qspi_fill_tx_fifo(struct zynqmp_qspi_priv *priv, u32 size)
> +{
> + u32 data;
> + u32 timeout = ZYNQMP_QSPI_DMA_POLL_TIMEOUT;
> + struct zynqmp_qspi_regs *regs = priv->regs;
> + u32 *buf = (u32 *)priv->tx_buf;
> + u32 len = size;
> +
> + debug("TxFIFO: 0x%x, size: 0x%x\n", readl(®s->isr),
> + size);
> +
> + while (size && timeout) {
> + if (readl(®s->isr) &
> + ZYNQMP_QSPI_IXR_TXNFULL_MASK) {
> + if (size >= 4) {
> + writel(*buf, ®s->txd0r);
> + buf++;
> + size -= 4;
> + } else {
> + switch (size) {
> + case 1:
> + data = *((u8 *)buf);
> + buf += 1;
> + data |= 0xFFFFFF00;
> + break;
> + case 2:
> + data = *((u16 *)buf);
> + buf += 2;
> + data |= 0xFFFF0000;
> + break;
> + case 3:
> + data = *((u16 *)buf);
> + buf += 2;
> + data |= (*((u8 *)buf) << 16);
> + buf += 1;
> + data |= 0xFF000000;
> + break;
> + }
> + writel(data, ®s->txd0r);
> + size = 0;
> + }
> + } else {
> + udelay(1);
> + timeout--;
> + }
> + }
> + if (!timeout) {
> + debug("zynqmp_qspi_fill_tx_fifo: Timeout\n");
> + return -1;
> + }
> +
> + priv->tx_buf += len;
> + return 0;
> +}
> +
> +static void zynqmp_qspi_genfifo_cmd(struct zynqmp_qspi_priv *priv)
> +{
> + u8 command = 1;
> + u32 gen_fifo_cmd;
> + u32 bytecount = 0;
> +
> + while (priv->len) {
> + gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
> + gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_TX;
> +
> + if (command) {
> + command = 0;
> + last_cmd = *(u8 *)priv->tx_buf;
> + }
> +
> + gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_SPI_MODE_SPI;
> + gen_fifo_cmd |= *(u8 *)priv->tx_buf;
> + bytecount++;
> + priv->len--;
> + priv->tx_buf = (u8 *)priv->tx_buf + 1;
> +
> + debug("GFIFO_CMD_Cmd = 0x%x\n", gen_fifo_cmd);
> +
> + zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
> + }
> +}
> +
> +static u32 zynqmp_qspi_calc_exp(struct zynqmp_qspi_priv *priv,
> + u32 *gen_fifo_cmd)
> +{
> + u32 expval = ZYNQMP_QSPI_GFIFO_EXP_INIT_VAL;
> + u32 len;
> +
> + while (1) {
> + if (priv->len > ZYNQMP_QSPI_GFIFO_IMD_MAX_DATA_LEN) {
> + if (priv->len & (1 << expval)) {
> + *gen_fifo_cmd &= ~ZYNQMP_QSPI_GFIFO_IMD_MASK;
> + *gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_EXP_MASK;
> + *gen_fifo_cmd |= expval;
> + priv->len -= (1 << expval);
> + return expval;
> + }
> + expval++;
> + } else {
> + *gen_fifo_cmd &= ~(ZYNQMP_QSPI_GFIFO_IMD_MASK |
> + ZYNQMP_QSPI_GFIFO_EXP_MASK);
> + *gen_fifo_cmd |= (u8)priv->len;
> + len = (u8)priv->len;
> + priv->len = 0;
> + return len;
> + }
> + }
> +}
> +
> +static int zynqmp_qspi_genfifo_fill_tx(struct zynqmp_qspi_priv *priv)
> +{
> + u32 gen_fifo_cmd;
> + u32 len;
> + int ret = 0;
> +
> + gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
> + gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_TX |
> + ZYNQMP_QSPI_GFIFO_DATA_XFR_MASK;
> +
> + if (priv->stripe)
> + gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_STRIPE_MASK;
> +
> + if (last_cmd == CMD_QUAD_PAGE_PROGRAM)
> + gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_SPI_MODE_QSPI;
> + else
> + gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_SPI_MODE_SPI;
> +
> + while (priv->len) {
> + len = zynqmp_qspi_calc_exp(priv, &gen_fifo_cmd);
> + zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
> +
> + debug("GFIFO_CMD_TX:0x%x\n", gen_fifo_cmd);
> +
> + if (gen_fifo_cmd & ZYNQMP_QSPI_GFIFO_EXP_MASK)
> + ret = zynqmp_qspi_fill_tx_fifo(priv,
> + 1 << len);
> + else
> + ret = zynqmp_qspi_fill_tx_fifo(priv,
> + len);
> +
> + if (ret)
> + return ret;
> + }
> + return ret;
> +}
> +
> +static int zynqmp_qspi_start_dma(struct zynqmp_qspi_priv *priv,
> + u32 gen_fifo_cmd, u32 *buf)
> +{
> + u32 addr;
> + u32 size, len;
> + u32 timeout = ZYNQMP_QSPI_DMA_POLL_TIMEOUT;
> + u32 actuallen = priv->len;
> + struct zynqmp_qspi_dma_regs *dma_regs = priv->dma_regs;
> +
> + writel((unsigned long)buf, &dma_regs->dmadst);
> + writel(roundup(priv->len, 4), &dma_regs->dmasize);
> + writel(ZYNQMP_QSPI_DMA_DST_I_STS_MASK, &dma_regs->dmaier);
> + addr = (unsigned long)buf;
> + size = roundup(priv->len, ARCH_DMA_MINALIGN);
> + flush_dcache_range(addr, addr+size);
> +
> + while (priv->len) {
> + len = zynqmp_qspi_calc_exp(priv, &gen_fifo_cmd);
> + if (!(gen_fifo_cmd & ZYNQMP_QSPI_GFIFO_EXP_MASK) &&
> + (len % 4)) {
> + gen_fifo_cmd &= ~(0xFF);
> + gen_fifo_cmd |= (len/4 + 1) * 4;
> + }
> + zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
> +
> + debug("GFIFO_CMD_RX:0x%x\n", gen_fifo_cmd);
> + }
> +
> + while (timeout) {
> + if (readl(&dma_regs->dmaisr) &
> + ZYNQMP_QSPI_DMA_DST_I_STS_DONE) {
> + writel(ZYNQMP_QSPI_DMA_DST_I_STS_DONE,
> + &dma_regs->dmaisr);
> + break;
> + }
> + udelay(1);
> + timeout--;
> + }
> +
> + debug("buf:0x%lx, rxbuf:0x%lx, *buf:0x%x len: 0x%x\n",
> + (unsigned long)buf, (unsigned long)priv->rx_buf, *buf,
> + actuallen);
> + if (!timeout) {
> + debug("DMA Timeout:0x%x\n", readl(&dma_regs->dmaisr));
> + return -1;
> + }
> +
> + if (buf != priv->rx_buf)
> + memcpy(priv->rx_buf, buf, actuallen);
> +
> + return 0;
> +}
> +
> +static int zynqmp_qspi_genfifo_fill_rx(struct zynqmp_qspi_priv *priv)
> +{
> + u32 gen_fifo_cmd;
> + u32 *buf;
> + u32 actuallen = priv->len;
> +
> + gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
> + gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_RX |
> + ZYNQMP_QSPI_GFIFO_DATA_XFR_MASK;
> +
> + if (last_cmd == CMD_READ_QUAD_OUTPUT_FAST ||
> + last_cmd == CMD_READ_QUAD_IO_FAST)
> + gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_SPI_MODE_QSPI;
> + else
> + gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_SPI_MODE_SPI;
> +
> + if (priv->stripe)
> + gen_fifo_cmd |= ZYNQMP_QSPI_GFIFO_STRIPE_MASK;
> +
> + /*
> + * Check if receive buffer is aligned to 4 byte and length
> + * is multiples of four byte as we are using dma to receive.
> + */
> + if (!((unsigned long)priv->rx_buf & (ZYNQMP_QSPI_DMA_ALIGN - 1)) &&
> + !(actuallen % ZYNQMP_QSPI_DMA_ALIGN)) {
> + buf = (u32 *)priv->rx_buf;
> + return zynqmp_qspi_start_dma(priv, gen_fifo_cmd, buf);
> + }
> +
> + ALLOC_CACHE_ALIGN_BUFFER(u8, tmp, roundup(priv->len,
> + ZYNQMP_QSPI_DMA_ALIGN));
> + buf = (u32 *)tmp;
> + return zynqmp_qspi_start_dma(priv, gen_fifo_cmd, buf);
> +}
> +
> +static int zynqmp_qspi_start_transfer(struct zynqmp_qspi_priv *priv)
> +{
> + int ret = 0;
> +
> + if (priv->is_inst) {
> + if (priv->tx_buf)
> + zynqmp_qspi_genfifo_cmd(priv);
> + else
> + ret = -1;
> + } else {
> + if (priv->tx_buf)
> + ret = zynqmp_qspi_genfifo_fill_tx(priv);
> + else if (priv->rx_buf)
> + ret = zynqmp_qspi_genfifo_fill_rx(priv);
> + else
> + ret = -1;
> + }
> + return ret;
> +}
> +
> +static int zynqmp_qspi_transfer(struct zynqmp_qspi_priv *priv)
> +{
> + static unsigned cs_change = 1;
> + int status = 0;
> +
> + debug("%s\n", __func__);
> +
> + while (1) {
> + /* Select the chip if required */
> + if (cs_change)
> + zynqmp_qspi_chipselect(priv, 1);
> +
> + cs_change = priv->cs_change;
> +
> + if (!priv->tx_buf && !priv->rx_buf && priv->len) {
> + status = -1;
> + break;
> + }
> +
> + /* Request the transfer */
> + if (priv->len) {
> + status = zynqmp_qspi_start_transfer(priv);
> + priv->is_inst = 0;
> + if (status < 0)
> + break;
> + }
> +
> + if (cs_change)
> + /* Deselect the chip */
> + zynqmp_qspi_chipselect(priv, 0);
> + break;
> + }
> +
> + return status;
> +}
> +
> +static int zynqmp_qspi_claim_bus(struct udevice *dev)
> +{
> + struct udevice *bus = dev->parent;
> + struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
> + struct zynqmp_qspi_regs *regs = priv->regs;
> +
> + debug("%s\n", __func__);
> + writel(ZYNQMP_QSPI_ENABLE_ENABLE_MASK, ®s->enbr);
> +
> + return 0;
> +}
> +
> +static int zynqmp_qspi_release_bus(struct udevice *dev)
> +{
> + struct udevice *bus = dev->parent;
> + struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
> + struct zynqmp_qspi_regs *regs = priv->regs;
> + u32 regval;
> +
> + debug("%s\n", __func__);
> + regval = readl(®s->enbr);
> + regval &= ~ZYNQMP_QSPI_ENABLE_ENABLE_MASK;
> + writel(regval, ®s->enbr);
> +
> + return 0;
> +}
> +
> +int zynqmp_qspi_xfer(struct udevice *dev, unsigned int bitlen, const void *dout,
> + void *din, unsigned long flags)
> +{
> + struct udevice *bus = dev->parent;
> + struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
> +
> + debug("%s: priv: 0x%08lx bitlen: %d dout: 0x%08lx ", __func__,
> + (unsigned long)priv, bitlen, (unsigned long)dout);
> + debug("din: 0x%08lx flags: 0x%lx\n", (unsigned long)din, flags);
> +
> + priv->tx_buf = dout;
> + priv->rx_buf = din;
> + priv->len = bitlen / 8;
> +
> + if (dout && flags & SPI_XFER_BEGIN)
> + priv->is_inst = 1;
> + else
> + priv->is_inst = 0;
> +
> + if (flags & SPI_XFER_END)
> + priv->cs_change = 1;
> + else
> + priv->cs_change = 0;
> +
> + priv->u_page = 0;
> + priv->stripe = 0;
> + priv->bus = 0;
> +
> + zynqmp_qspi_transfer(priv);
> +
> + return 0;
> +}
> +
> +static const struct dm_spi_ops zynqmp_qspi_ops = {
> + .claim_bus = zynqmp_qspi_claim_bus,
> + .release_bus = zynqmp_qspi_release_bus,
> + .xfer = zynqmp_qspi_xfer,
> + .set_speed = zynqmp_qspi_set_speed,
> + .set_mode = zynqmp_qspi_set_mode,
> +};
> +
> +static const struct udevice_id zynqmp_qspi_ids[] = {
> + { .compatible = "xlnx,zynqmp-qspi-1.0" },
> + { }
> +};
> +
> +U_BOOT_DRIVER(zynqmp_qspi) = {
> + .name = "zynqmp_qspi",
> + .id = UCLASS_SPI,
> + .of_match = zynqmp_qspi_ids,
> + .ops = &zynqmp_qspi_ops,
> + .ofdata_to_platdata = zynqmp_qspi_ofdata_to_platdata,
> + .platdata_auto_alloc_size = sizeof(struct zynqmp_qspi_platdata),
> + .priv_auto_alloc_size = sizeof(struct zynqmp_qspi_priv),
> + .probe = zynqmp_qspi_probe,
> + .child_pre_probe = zynqmp_qspi_child_pre_probe,
> +};
>
Tested-by: Michal Simek <michal.simek at xilinx.com>
Thanks,
Michal
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