[U-Boot] [PATCH v6 1/2] spi: zynqmp_gqspi: Add support for ZynqMP qspi driver
Siva Durga Prasad Paladugu
siva.durga.paladugu at xilinx.com
Wed Jun 27 11:53:49 UTC 2018
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 <siva.durga.paladugu at xilinx.com>
---
Changes for v6:
- Removed spi_flash.h inclusion and other unused macros
- Fixed coding style comments
- Removed tx_rx_mode in plat and removed preprobe routine.
- Used proper error codes
Changed for v5:
- Removed zynqm_gqspi.h file which was added
by mistake.
Changes for v4:
- Moved macro definitions back to .c
- Removed last_cmd and flash command checks in driver
- Used macros and GENMASK as per comments
- Removed debugs wherever commented.
- Modified set_mode routine as per comment
Changes for v3:
- Renamed all macros, functions, files and configs as per comment
- Used wait_for_bit wherever required
- Removed unnecessary header inclusion
Changes for v2:
- Rebased on top of latest master
- Moved macro definitions to .h file as per comment
- Fixed magic values with macros as per comment
---
drivers/spi/Kconfig | 7 +
drivers/spi/Makefile | 1 +
drivers/spi/zynqmp_gqspi.c | 774 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 782 insertions(+)
create mode 100644 drivers/spi/zynqmp_gqspi.c
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 3532c2a..c3c424e 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -223,6 +223,13 @@ 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_GQSPI
+ bool "Configure ZynqMP Generic QSPI"
+ depends on ARCH_ZYNQMP
+ help
+ This option is used to enable ZynqMP QSPI controller driver which
+ is used to communicate with qspi flash devices.
+
endif # if DM_SPI
config SOFT_SPI
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 5a2c00e..2187633 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_GQSPI) += zynqmp_gqspi.o
diff --git a/drivers/spi/zynqmp_gqspi.c b/drivers/spi/zynqmp_gqspi.c
new file mode 100644
index 0000000..c224522
--- /dev/null
+++ b/drivers/spi/zynqmp_gqspi.c
@@ -0,0 +1,774 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2018 Xilinx
+ *
+ * Xilinx ZynqMP Generic Quad-SPI(QSPI) controller driver(master mode only)
+ */
+
+#include <common.h>
+#include <asm/arch/clk.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/io.h>
+#include <clk.h>
+#include <dm.h>
+#include <malloc.h>
+#include <memalign.h>
+#include <spi.h>
+#include <ubi_uboot.h>
+#include <wait_bit.h>
+
+#define GQSPI_GFIFO_STRT_MODE_MASK BIT(29)
+#define GQSPI_CONFIG_MODE_EN_MASK (3 << 30)
+#define GQSPI_CONFIG_DMA_MODE (2 << 30)
+#define GQSPI_CONFIG_CPHA_MASK BIT(2)
+#define GQSPI_CONFIG_CPOL_MASK BIT(1)
+
+/* QSPI MIO's count for different connection topologies */
+#define GQSPI_MIO_NUM_QSPI0 6
+#define GQSPI_MIO_NUM_QSPI1 5
+#define GQSPI_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 GQSPI_IXR_TXNFULL_MASK 0x00000004 /* QSPI TX FIFO Overflow */
+#define GQSPI_IXR_TXFULL_MASK 0x00000008 /* QSPI TX FIFO is full */
+#define GQSPI_IXR_RXNEMTY_MASK 0x00000010 /* QSPI RX FIFO Not Empty */
+#define GQSPI_IXR_GFEMTY_MASK 0x00000080 /* QSPI Generic FIFO Empty */
+#define GQSPI_IXR_ALL_MASK (GQSPI_IXR_TXNFULL_MASK | \
+ GQSPI_IXR_RXNEMTY_MASK)
+
+/*
+ * QSPI Enable Register bit Masks
+ *
+ * This register is used to enable or disable the QSPI controller
+ */
+#define GQSPI_ENABLE_ENABLE_MASK 0x00000001 /* QSPI Enable Bit Mask */
+
+#define GQSPI_GFIFO_LOW_BUS BIT(14)
+#define GQSPI_GFIFO_CS_LOWER BIT(12)
+#define GQSPI_GFIFO_UP_BUS BIT(15)
+#define GQSPI_GFIFO_CS_UPPER BIT(13)
+#define GQSPI_SPI_MODE_QSPI (3 << 10)
+#define GQSPI_SPI_MODE_SPI BIT(10)
+#define GQSPI_SPI_MODE_DUAL_SPI (2 << 10)
+#define GQSPI_IMD_DATA_CS_ASSERT 5
+#define GQSPI_IMD_DATA_CS_DEASSERT 5
+#define GQSPI_GFIFO_TX BIT(16)
+#define GQSPI_GFIFO_RX BIT(17)
+#define GQSPI_GFIFO_STRIPE_MASK BIT(18)
+#define GQSPI_GFIFO_IMD_MASK 0xFF
+#define GQSPI_GFIFO_EXP_MASK BIT(9)
+#define GQSPI_GFIFO_DATA_XFR_MASK BIT(8)
+#define GQSPI_STRT_GEN_FIFO BIT(28)
+#define GQSPI_GEN_FIFO_STRT_MOD BIT(29)
+#define GQSPI_GFIFO_WP_HOLD BIT(19)
+#define GQSPI_BAUD_DIV_MASK (7 << 3)
+#define GQSPI_DFLT_BAUD_RATE_DIV BIT(3)
+#define GQSPI_GFIFO_ALL_INT_MASK 0xFBE
+#define GQSPI_DMA_DST_I_STS_DONE BIT(1)
+#define GQSPI_DMA_DST_I_STS_MASK 0xFE
+#define MODEBITS 0x6
+
+#define GQSPI_GFIFO_SELECT BIT(0)
+#define GQSPI_FIFO_THRESHOLD 1
+
+#define SPI_XFER_ON_BOTH 0
+#define SPI_XFER_ON_LOWER 1
+#define SPI_XFER_ON_UPPER 2
+
+#define GQSPI_DMA_ALIGN 0x4
+#define GQSPI_MAX_BAUD_RATE_VAL 7
+#define GQSPI_DFLT_BAUD_RATE_VAL 2
+
+#define GQSPI_TIMEOUT 100000000
+
+#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_LPBK_MASK 0x00000020
+#define GQSPI_FREQ_40MHZ 40000000
+#define GQSPI_FREQ_100MHZ 100000000
+#define GQSPI_FREQ_150MHZ 150000000
+#define IOU_TAPDLY_BYPASS_MASK 0x7
+
+#define GQSPI_REG_OFFSET 0x100
+#define GQSPI_DMA_REG_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 */
+ 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 */
+};
+
+DECLARE_GLOBAL_DATA_PTR;
+
+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;
+ 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 int zynqmp_qspi_ofdata_to_platdata(struct udevice *bus)
+{
+ struct zynqmp_qspi_platdata *plat = bus->platdata;
+ struct spi_slave *slave = dev_get_parent_priv(bus);
+ u32 mode = 0;
+ u32 value;
+
+ debug("%s\n", __func__);
+
+ plat->regs = (struct zynqmp_qspi_regs *)(devfdt_get_addr(bus) +
+ GQSPI_REG_OFFSET);
+ plat->dma_regs = (struct zynqmp_qspi_dma_regs *)
+ (devfdt_get_addr(bus) + GQSPI_DMA_REG_OFFSET);
+
+ if (dev_read_bool(bus, "spi-cpol"))
+ mode |= SPI_CPOL;
+ if (dev_read_bool(bus, "spi-cpha"))
+ mode |= SPI_CPHA;
+
+ 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;
+ }
+
+ slave->mode = mode;
+
+ return 0;
+}
+
+static void zynqmp_qspi_init_hw(struct zynqmp_qspi_priv *priv)
+{
+ u32 config_reg;
+ struct zynqmp_qspi_regs *regs = priv->regs;
+
+ writel(GQSPI_GFIFO_SELECT, ®s->gqspisel);
+ writel(GQSPI_GFIFO_ALL_INT_MASK, ®s->idisr);
+ writel(GQSPI_FIFO_THRESHOLD, ®s->txftr);
+ writel(GQSPI_FIFO_THRESHOLD, ®s->rxftr);
+ writel(GQSPI_GFIFO_ALL_INT_MASK, ®s->isr);
+
+ config_reg = readl(®s->confr);
+ config_reg &= ~(GQSPI_GFIFO_STRT_MODE_MASK |
+ GQSPI_CONFIG_MODE_EN_MASK);
+ config_reg |= GQSPI_CONFIG_DMA_MODE |
+ GQSPI_GFIFO_WP_HOLD |
+ GQSPI_DFLT_BAUD_RATE_DIV;
+ writel(config_reg, ®s->confr);
+
+ writel(GQSPI_ENABLE_ENABLE_MASK, ®s->enbr);
+}
+
+static u32 zynqmp_qspi_bus_select(struct zynqmp_qspi_priv *priv)
+{
+ u32 gqspi_fifo_reg = 0;
+
+ gqspi_fifo_reg = GQSPI_GFIFO_LOW_BUS |
+ GQSPI_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;
+ int ret = 0;
+
+ ret = wait_for_bit_le32(®s->isr, GQSPI_IXR_GFEMTY_MASK, 1,
+ GQSPI_TIMEOUT, 1);
+ if (ret)
+ printf("%s Timeout\n", __func__);
+
+ 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 |= GQSPI_SPI_MODE_SPI |
+ GQSPI_IMD_DATA_CS_ASSERT;
+ } else {
+ gqspi_fifo_reg = GQSPI_GFIFO_LOW_BUS;
+ gqspi_fifo_reg |= GQSPI_IMD_DATA_CS_DEASSERT;
+ }
+
+ debug("GFIFO_CMD_CS: 0x%x\n", gqspi_fifo_reg);
+
+ zynqmp_qspi_fill_gen_fifo(priv, gqspi_fifo_reg);
+}
+
+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(®s->lpbkdly);
+ lpbkdlyadj |= (GQSPI_LPBK_DLY_ADJ_LPBK_MASK);
+ datadlyadj = readl(®s->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(®s->lpbkdly);
+ lpbkdlyadj |= ((GQSPI_LPBK_DLY_ADJ_LPBK_MASK) |
+ GQSPI_LPBK_DLY_ADJ_DLY_0);
+ }
+
+ zynqmp_mmio_write(IOU_TAPDLY_BYPASS_OFST, IOU_TAPDLY_BYPASS_MASK,
+ tapdlybypass);
+ writel(lpbkdlyadj, ®s->lpbkdly);
+ writel(datadlyadj, ®s->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(®s->confr);
+ if (speed == 0) {
+ /* Set baudrate x8, if the freq is 0 */
+ baud_rate_val = GQSPI_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 > GQSPI_MAX_BAUD_RATE_VAL)
+ baud_rate_val = GQSPI_DFLT_BAUD_RATE_VAL;
+
+ plat->speed_hz = plat->frequency / (2 << baud_rate_val);
+ }
+ confr &= ~GQSPI_BAUD_DIV_MASK;
+ confr |= (baud_rate_val << 3);
+ writel(confr, ®s->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_probe(struct udevice *bus)
+{
+ struct zynqmp_qspi_platdata *plat = dev_get_platdata(bus);
+ struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
+ struct clk clk;
+ unsigned long clock;
+ int ret;
+
+ debug("%s: bus:%p, priv:%p\n", __func__, bus, priv);
+
+ priv->regs = plat->regs;
+ priv->dma_regs = plat->dma_regs;
+
+ 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;
+ }
+ plat->frequency = clock;
+ plat->speed_hz = plat->frequency / 2;
+
+ /* 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(®s->confr);
+ confr &= ~(GQSPI_CONFIG_CPHA_MASK |
+ GQSPI_CONFIG_CPOL_MASK);
+
+ if (mode & SPI_CPHA)
+ confr |= GQSPI_CONFIG_CPHA_MASK;
+ if (mode & SPI_CPOL)
+ confr |= GQSPI_CONFIG_CPOL_MASK;
+
+ writel(confr, ®s->confr);
+
+ return 0;
+}
+
+static int zynqmp_qspi_fill_tx_fifo(struct zynqmp_qspi_priv *priv, u32 size)
+{
+ u32 data;
+ int ret = 0;
+ 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) {
+ ret = wait_for_bit_le32(®s->isr, GQSPI_IXR_TXNFULL_MASK, 1,
+ GQSPI_TIMEOUT, 1);
+ if (ret) {
+ printf("%s: Timeout\n", __func__);
+ return ret;
+ }
+
+ if (size >= 4) {
+ writel(*buf, ®s->txd0r);
+ buf++;
+ size -= 4;
+ } else {
+ switch (size) {
+ case 1:
+ data = *((u8 *)buf);
+ buf += 1;
+ data |= GENMASK(31, 8);
+ break;
+ case 2:
+ data = *((u16 *)buf);
+ buf += 2;
+ data |= GENMASK(31, 16);
+ break;
+ case 3:
+ data = *((u16 *)buf);
+ buf += 2;
+ data |= (*((u8 *)buf) << 16);
+ buf += 1;
+ data |= GENMASK(31, 24);
+ break;
+ }
+ writel(data, ®s->txd0r);
+ size = 0;
+ }
+ }
+
+ priv->tx_buf += len;
+ return 0;
+}
+
+static void zynqmp_qspi_genfifo_cmd(struct zynqmp_qspi_priv *priv)
+{
+ u32 gen_fifo_cmd;
+ u32 bytecount = 0;
+
+ while (priv->len) {
+ gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
+ gen_fifo_cmd |= GQSPI_GFIFO_TX | GQSPI_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 &= ~GQSPI_GFIFO_IMD_MASK;
+ *gen_fifo_cmd |= GQSPI_GFIFO_EXP_MASK;
+ *gen_fifo_cmd |= expval;
+ priv->len -= (1 << expval);
+ return expval;
+ }
+ expval++;
+ } else {
+ *gen_fifo_cmd &= ~(GQSPI_GFIFO_IMD_MASK |
+ GQSPI_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 |= GQSPI_GFIFO_TX |
+ GQSPI_GFIFO_DATA_XFR_MASK;
+
+ gen_fifo_cmd |= GQSPI_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 & GQSPI_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 actuallen = priv->len;
+ int ret = 0;
+ struct zynqmp_qspi_dma_regs *dma_regs = priv->dma_regs;
+
+ writel((unsigned long)buf, &dma_regs->dmadst);
+ writel(roundup(priv->len, ARCH_DMA_MINALIGN), &dma_regs->dmasize);
+ writel(GQSPI_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 & GQSPI_GFIFO_EXP_MASK) &&
+ (len % ARCH_DMA_MINALIGN)) {
+ gen_fifo_cmd &= ~GENMASK(7, 0);
+ gen_fifo_cmd |= roundup(len, ARCH_DMA_MINALIGN);
+ }
+ zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
+
+ debug("GFIFO_CMD_RX:0x%x\n", gen_fifo_cmd);
+ }
+
+ ret = wait_for_bit_le32(&dma_regs->dmaisr, GQSPI_DMA_DST_I_STS_DONE,
+ 1, GQSPI_TIMEOUT, 1);
+ if (ret) {
+ printf("DMA Timeout:0x%x\n", readl(&dma_regs->dmaisr));
+ return -ETIMEDOUT;
+ }
+
+ writel(GQSPI_DMA_DST_I_STS_DONE, &dma_regs->dmaisr);
+
+ 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 (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 |= GQSPI_GFIFO_RX |
+ GQSPI_GFIFO_DATA_XFR_MASK;
+
+ gen_fifo_cmd |= GQSPI_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 & (GQSPI_DMA_ALIGN - 1)) &&
+ !(actuallen % GQSPI_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,
+ GQSPI_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
+ return -EINVAL;
+ } 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
+ return -EINVAL;
+ }
+ 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 = -EINVAL;
+ 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;
+
+ writel(GQSPI_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;
+
+ writel(~GQSPI_ENABLE_ENABLE_MASK, ®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;
+
+ /*
+ * 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,
+};
--
2.7.4
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