[U-Boot] [UBOOT PATCH 1/2] spi: zynqmp_qspi: Add support for ZynqMP qspi driver

This patch adds qspi driver support for ZynqMP SoC. This driver is responsible for communicating with qspi flash devices.

Signed-off-by: Siva Durga Prasad Paladugu sivadur@xilinx.com --- arch/arm/cpu/armv8/zynqmp/Kconfig | 7 + drivers/spi/Makefile | 1 + drivers/spi/zynqmp_qspi.c | 817 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 825 insertions(+) create mode 100644 drivers/spi/zynqmp_qspi.c

diff --git a/arch/arm/cpu/armv8/zynqmp/Kconfig b/arch/arm/cpu/armv8/zynqmp/Kconfig index 5ffc9f6..278248a 100644 --- a/arch/arm/cpu/armv8/zynqmp/Kconfig +++ b/arch/arm/cpu/armv8/zynqmp/Kconfig @@ -50,6 +50,13 @@ config BOOT_INIT_FILE Add register writes to boot.bin format (max 256 pairs). Expect a table of register-value pairs, e.g. "0x12345678 0x4321"

+config ZYNQMP_QSPI + bool "Configure ZynqMP QSPI" + select DM_SPI + help + This option is used to enable ZynqMP QSPI controller driver which + is used to communicate with qspi flash devices. + config ZYNQMP_USB bool "Configure ZynqMP USB"

diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index ad56203..b465c71 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -50,3 +50,4 @@ 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..7ec669e --- /dev/null +++ b/drivers/spi/zynqmp_qspi.c @@ -0,0 +1,817 @@ +/* + * (C) Copyright 2014 - 2015 Xilinx + * + * Xilinx ZynqMP Quad-SPI(QSPI) controller driver (master mode only) + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#include <common.h> +#include <malloc.h> +#include <memalign.h> +#include <ubi_uboot.h> +#include <spi.h> +#include <spi_flash.h> +#include <asm/io.h> +#include <asm/arch/hardware.h> +#include <asm/arch/sys_proto.h> +#include <asm/arch/clk.h> +#include "../mtd/spi/sf_internal.h" +#include <clk.h> + +DECLARE_GLOBAL_DATA_PTR; + +#define ZYNQMP_QSPI_GFIFO_STRT_MODE_MASK BIT(29) +#define ZYNQMP_QSPI_CONFIG_MODE_EN_MASK (3 << 30) +#define ZYNQMP_QSPI_CONFIG_DMA_MODE (2 << 30) +#define ZYNQMP_QSPI_CONFIG_CPHA_MASK BIT(2) +#define ZYNQMP_QSPI_CONFIG_CPOL_MASK BIT(1) + +/* QSPI MIO's count for different connection topologies */ +#define ZYNQMP_QSPI_MIO_NUM_QSPI0 6 +#define ZYNQMP_QSPI_MIO_NUM_QSPI1 5 +#define ZYNQMP_QSPI_MIO_NUM_QSPI1_CS 1 + +/* + * QSPI Interrupt Registers bit Masks + * + * All the four interrupt registers (Status/Mask/Enable/Disable) have the same + * bit definitions. + */ +#define ZYNQMP_QSPI_IXR_TXNFULL_MASK 0x00000004 /* QSPI TX FIFO Overflow */ +#define ZYNQMP_QSPI_IXR_TXFULL_MASK 0x00000008 /* QSPI TX FIFO is full */ +#define ZYNQMP_QSPI_IXR_RXNEMTY_MASK 0x00000010 /* QSPI RX FIFO Not Empty */ +#define ZYNQMP_QSPI_IXR_GFEMTY_MASK 0x00000080 /* QSPI Generic FIFO Empty */ +#define ZYNQMP_QSPI_IXR_ALL_MASK (ZYNQMP_QSPI_IXR_TXNFULL_MASK | \ + ZYNQMP_QSPI_IXR_RXNEMTY_MASK) + +/* + * QSPI Enable Register bit Masks + * + * This register is used to enable or disable the QSPI controller + */ +#define ZYNQMP_QSPI_ENABLE_ENABLE_MASK 0x00000001 /* QSPI Enable Bit Mask */ + +#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_SPI_MODE_QSPI (3 << 10) +#define ZYNQMP_QSPI_SPI_MODE_SPI BIT(10) +#define ZYNQMP_QSPI_SPI_MODE_DUAL_SPI (2 << 10) +#define ZYNQMP_QSPI_IMD_DATA_CS_ASSERT 5 +#define ZYNQMP_QSPI_IMD_DATA_CS_DEASSERT 5 +#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 0xFF +#define ZYNQMP_QSPI_GFIFO_EXP_MASK BIT(9) +#define ZYNQMP_QSPI_GFIFO_DATA_XFR_MASK BIT(8) +#define ZYNQMP_QSPI_STRT_GEN_FIFO BIT(28) +#define ZYNQMP_QSPI_GEN_FIFO_STRT_MOD BIT(29) +#define ZYNQMP_QSPI_GFIFO_WP_HOLD BIT(19) +#define ZYNQMP_QSPI_BAUD_DIV_MASK (7 << 3) +#define ZYNQMP_QSPI_DFLT_BAUD_RATE_DIV BIT(3) +#define ZYNQMP_QSPI_GFIFO_ALL_INT_MASK 0xFBE +#define ZYNQMP_QSPI_DMA_DST_I_STS_DONE BIT(1) +#define ZYNQMP_QSPI_DMA_DST_I_STS_MASK 0xFE +#define MODEBITS 0x6 + +#define QUAD_OUT_READ_CMD 0x6B +#define QUAD_PAGE_PROGRAM_CMD 0x32 +#define DUAL_OUTPUT_FASTRD_CMD 0x3B + +#define ZYNQMP_QSPI_GFIFO_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_MAX_BAUD_RATE_VAL 7 +#define ZYNQMP_QSPI_DFLT_BAUD_RATE_VAL 2 + +#define ZYNQMP_QSPI_TIMEOUT 100000000 + +/* 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 */ + u32 reserved3[36]; /* 0x68 */ + u32 gqspidlyadj; /* 0xF8 */ +}; + +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; + unsigned int tx_rx_mode; +}; + +struct zynqmp_qspi_priv { + struct zynqmp_qspi_regs *regs; + struct zynqmp_qspi_dma_regs *dma_regs; + u8 mode; + const void *tx_buf; + void *rx_buf; + unsigned int len; + int bytes_to_transfer; + int bytes_to_receive; + unsigned int is_inst; + unsigned int cs_change:1; +}; + +static u8 last_cmd; + +static int zynqmp_qspi_ofdata_to_platdata(struct udevice *bus) +{ + struct zynqmp_qspi_platdata *plat = bus->platdata; + u32 mode = 0; + u32 value; + int ret; + struct clk clk; + unsigned long clock; + + debug("%s\n", __func__); + + plat->regs = (struct zynqmp_qspi_regs *)(devfdt_get_addr(bus) + 0x100); + plat->dma_regs = (struct zynqmp_qspi_dma_regs *)(devfdt_get_addr(bus) + + 0x800); + + ret = clk_get_by_index(bus, 0, &clk); + if (ret < 0) { + dev_err(dev, "failed to get clock\n"); + return ret; + } + + clock = clk_get_rate(&clk); + if (IS_ERR_VALUE(clock)) { + dev_err(dev, "failed to get rate\n"); + return clock; + } + debug("%s: CLK %ld\n", __func__, clock); + + ret = clk_enable(&clk); + if (ret && ret != -ENOSYS) { + dev_err(dev, "failed to enable clock\n"); + return ret; + } + + value = dev_read_u32_default(bus, "spi-rx-bus-width", 1); + switch (value) { + case 1: + break; + case 2: + mode |= SPI_RX_DUAL; + break; + case 4: + mode |= SPI_RX_QUAD; + break; + default: + printf("Invalid spi-rx-bus-width %d\n", value); + break; + } + + value = dev_read_u32_default(bus, "spi-tx-bus-width", 1); + switch (value) { + case 1: + break; + case 2: + mode |= SPI_TX_DUAL; + break; + case 4: + mode |= SPI_TX_QUAD; + break; + default: + printf("Invalid spi-tx-bus-width %d\n", value); + break; + } + + plat->tx_rx_mode = mode; + + plat->frequency = clock; + plat->speed_hz = plat->frequency; + + 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_GFIFO_SELECT, &regs->gqspisel); + writel(ZYNQMP_QSPI_GFIFO_ALL_INT_MASK, &regs->idisr); + writel(ZYNQMP_QSPI_FIFO_THRESHOLD, &regs->txftr); + writel(ZYNQMP_QSPI_FIFO_THRESHOLD, &regs->rxftr); + writel(ZYNQMP_QSPI_GFIFO_ALL_INT_MASK, &regs->isr); + + config_reg = readl(&regs->confr); + config_reg &= ~(ZYNQMP_QSPI_GFIFO_STRT_MODE_MASK | + ZYNQMP_QSPI_CONFIG_MODE_EN_MASK); + config_reg |= ZYNQMP_QSPI_CONFIG_DMA_MODE | + ZYNQMP_QSPI_GFIFO_WP_HOLD | + ZYNQMP_QSPI_DFLT_BAUD_RATE_DIV; + writel(config_reg, &regs->confr); + + writel(ZYNQMP_QSPI_ENABLE_ENABLE_MASK, &regs->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(&regs->isr); + } while (!(reg & ZYNQMP_QSPI_IXR_GFEMTY_MASK)); + + writel(gqspi_fifo_reg, &regs->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_SPI_MODE_SPI | + ZYNQMP_QSPI_IMD_DATA_CS_ASSERT; + } else { + gqspi_fifo_reg = ZYNQMP_QSPI_GFIFO_LOW_BUS; + gqspi_fifo_reg |= ZYNQMP_QSPI_IMD_DATA_CS_DEASSERT; + } + + debug("GFIFO_CMD_CS: 0x%x\n", gqspi_fifo_reg); + + zynqmp_qspi_fill_gen_fifo(priv, gqspi_fifo_reg); +} + +#define GQSPI_BAUD_DIV_SHIFT 2 +#define GQSPI_LPBK_DLY_ADJ_LPBK_SHIFT 5 +#define GQSPI_LPBK_DLY_ADJ_DLY_1 0x2 +#define GQSPI_LPBK_DLY_ADJ_DLY_1_SHIFT 3 +#define GQSPI_LPBK_DLY_ADJ_DLY_0 0x3 +#define GQSPI_USE_DATA_DLY 0x1 +#define GQSPI_USE_DATA_DLY_SHIFT 31 +#define GQSPI_DATA_DLY_ADJ_VALUE 0x2 +#define GQSPI_DATA_DLY_ADJ_SHIFT 28 +#define TAP_DLY_BYPASS_LQSPI_RX_VALUE 0x1 +#define TAP_DLY_BYPASS_LQSPI_RX_SHIFT 2 +#define GQSPI_DATA_DLY_ADJ_OFST 0x000001F8 +#define IOU_TAPDLY_BYPASS_OFST 0xFF180390 +#define GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK 0x00000020 +#define GQSPI_FREQ_40MHZ 40000000 +#define GQSPI_FREQ_100MHZ 100000000 +#define GQSPI_FREQ_150MHZ 150000000 +#define IOU_TAPDLY_BYPASS_MASK 0x7 + +void zynqmp_qspi_set_tapdelay(struct udevice *bus, u32 baudrateval) +{ + struct zynqmp_qspi_platdata *plat = bus->platdata; + struct zynqmp_qspi_priv *priv = dev_get_priv(bus); + struct zynqmp_qspi_regs *regs = priv->regs; + u32 tapdlybypass = 0, lpbkdlyadj = 0, datadlyadj = 0, clk_rate; + u32 reqhz = 0; + + clk_rate = plat->frequency; + reqhz = (clk_rate / (GQSPI_BAUD_DIV_SHIFT << baudrateval)); + + debug("%s, req_hz:%d, clk_rate:%d, baudrateval:%d\n", + __func__, reqhz, clk_rate, baudrateval); + + if (reqhz < GQSPI_FREQ_40MHZ) { + zynqmp_mmio_read(IOU_TAPDLY_BYPASS_OFST, &tapdlybypass); + tapdlybypass |= (TAP_DLY_BYPASS_LQSPI_RX_VALUE << + TAP_DLY_BYPASS_LQSPI_RX_SHIFT); + } else if (reqhz < GQSPI_FREQ_100MHZ) { + zynqmp_mmio_read(IOU_TAPDLY_BYPASS_OFST, &tapdlybypass); + tapdlybypass |= (TAP_DLY_BYPASS_LQSPI_RX_VALUE << + TAP_DLY_BYPASS_LQSPI_RX_SHIFT); + lpbkdlyadj = readl(&regs->lpbkdly); + lpbkdlyadj |= (GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK); + datadlyadj = readl(&regs->gqspidlyadj); + datadlyadj |= ((GQSPI_USE_DATA_DLY << GQSPI_USE_DATA_DLY_SHIFT) + | (GQSPI_DATA_DLY_ADJ_VALUE << + GQSPI_DATA_DLY_ADJ_SHIFT)); + } else if (reqhz < GQSPI_FREQ_150MHZ) { + lpbkdlyadj = readl(&regs->lpbkdly); + lpbkdlyadj |= ((GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK) | + GQSPI_LPBK_DLY_ADJ_DLY_0); + } + + zynqmp_mmio_write(IOU_TAPDLY_BYPASS_OFST, IOU_TAPDLY_BYPASS_MASK, + tapdlybypass); + writel(lpbkdlyadj, &regs->lpbkdly); + writel(datadlyadj, &regs->gqspidlyadj); +} + +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; + u32 confr; + u8 baud_rate_val = 0; + + debug("%s\n", __func__); + if (speed > plat->frequency) + speed = plat->frequency; + + /* Set the clock frequency */ + confr = readl(&regs->confr); + if (speed == 0) { + /* Set baudrate x8, if the freq is 0 */ + baud_rate_val = ZYNQMP_QSPI_DFLT_BAUD_RATE_VAL; + } else if (plat->speed_hz != speed) { + while ((baud_rate_val < 8) && + ((plat->frequency / + (2 << baud_rate_val)) > speed)) + baud_rate_val++; + + if (baud_rate_val > ZYNQMP_QSPI_MAX_BAUD_RATE_VAL) + baud_rate_val = ZYNQMP_QSPI_DFLT_BAUD_RATE_VAL; + + plat->speed_hz = plat->frequency / (2 << baud_rate_val); + } + confr &= ~ZYNQMP_QSPI_BAUD_DIV_MASK; + confr |= (baud_rate_val << 3); + writel(confr, &regs->confr); + + zynqmp_qspi_set_tapdelay(bus, baud_rate_val); + debug("regs=%p, speed=%d\n", priv->regs, plat->speed_hz); + + return 0; +} + +static int zynqmp_qspi_child_pre_probe(struct udevice *bus) +{ + struct spi_slave *slave = dev_get_parent_priv(bus); + struct zynqmp_qspi_platdata *plat = dev_get_platdata(bus->parent); + + slave->option = SF_SINGLE_FLASH; + slave->mode = plat->tx_rx_mode; + + 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("%s: bus:%p, priv:%p\n", __func__, 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; + u32 confr; + + debug("%s\n", __func__); + /* Set the SPI Clock phase and polarities */ + confr = readl(&regs->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; + + //writel(confr, &regs->confr); + 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_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(&regs->isr), + size); + + while (size && timeout) { + if (readl(&regs->isr) & + ZYNQMP_QSPI_IXR_TXNFULL_MASK) { + if (size >= 4) { + writel(*buf, &regs->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, &regs->txd0r); + size = 0; + } + } else { + udelay(1); + timeout--; + } + } + if (!timeout) { + printf("%s: Timeout\n", __func__); + 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_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 = 8; + u32 len; + + while (1) { + if (priv->len > 255) { + 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 (last_cmd == QUAD_PAGE_PROGRAM_CMD) + gen_fifo_cmd |= ZYNQMP_QSPI_SPI_MODE_QSPI; + else + gen_fifo_cmd |= ZYNQMP_QSPI_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_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) { + printf("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 == QUAD_OUT_READ_CMD) + gen_fifo_cmd |= ZYNQMP_QSPI_SPI_MODE_QSPI; + else if (last_cmd == DUAL_OUTPUT_FASTRD_CMD) + gen_fifo_cmd |= ZYNQMP_QSPI_SPI_MODE_DUAL_SPI; + else + gen_fifo_cmd |= ZYNQMP_QSPI_SPI_MODE_SPI; + + /* + * 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 int 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, &regs->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; + + debug("%s\n", __func__); + writel(~ZYNQMP_QSPI_ENABLE_ENABLE_MASK, &regs->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; + + /* + * Festering sore. + * Assume that the beginning of a transfer with bits to + * transmit must contain a device command. + */ + 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; + + 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, +};