From: Matt Porter <matt.por...@linaro.org>
Adds a SPI master driver for the TI QSPI peripheral.
Signed-off-by: Matt Porter <matt.por...@linaro.org>
Signed-off-by: Sourav Poddar <sourav.pod...@ti.com>
[Added quad read support and memory mapped support).
---
drivers/spi/Makefile | 1 +
drivers/spi/ti_qspi.c | 324 +++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 325 insertions(+), 0 deletions(-)
create mode 100644 drivers/spi/ti_qspi.c
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 91d24ce..e5941b0 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -38,6 +38,7 @@ COBJS-$(CONFIG_FDT_SPI) += fdt_spi.o
COBJS-$(CONFIG_TEGRA20_SFLASH) += tegra20_sflash.o
COBJS-$(CONFIG_TEGRA20_SLINK) += tegra20_slink.o
COBJS-$(CONFIG_TEGRA114_SPI) += tegra114_spi.o
+COBJS-$(CONFIG_TI_QSPI) += ti_qspi.o
COBJS-$(CONFIG_XILINX_SPI) += xilinx_spi.o
COBJS-$(CONFIG_ZYNQ_SPI) += zynq_spi.o
diff --git a/drivers/spi/ti_qspi.c b/drivers/spi/ti_qspi.c
new file mode 100644
index 0000000..3e88cf4
--- /dev/null
+++ b/drivers/spi/ti_qspi.c
@@ -0,0 +1,324 @@
+/*
+ * TI QSPI driver
+ *
+ * Copyright (C) 2013, Texas Instruments, Incorporated
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/omap.h>
+#include <malloc.h>
+#include <spi.h>
+
+struct qspi_slave {
+ struct spi_slave slave;
+ unsigned int mode;
+ u32 cmd;
+ u32 dc;
+};
+
+#define to_qspi_slave(s) container_of(s, struct qspi_slave, slave)
+
+struct qspi_regs {
+ u32 pid;
+ u32 pad0[3];
+ u32 sysconfig;
+ u32 pad1[3];
+ u32 intr_status_raw_set;
+ u32 intr_status_enabled_clear;
+ u32 intr_enable_set;
+ u32 intr_enable_clear;
+ u32 intc_eoi;
+ u32 pad2[3];
+ u32 spi_clock_cntrl;
+ u32 spi_dc;
+ u32 spi_cmd;
+ u32 spi_status;
+ u32 spi_data;
+ u32 spi_setup0;
+ u32 spi_setup1;
+ u32 spi_setup2;
+ u32 spi_setup3;
+ u32 spi_switch;
+ u32 spi_data1;
+ u32 spi_data2;
+ u32 spi_data3;
+};
+
+static struct qspi_regs *qspi = (struct qspi_regs *)QSPI_BASE;
+
+#define QSPI_TIMEOUT 2000000
+
+#define QSPI_FCLK 192000000
+
+/* Clock Control */
+#define QSPI_CLK_EN (1 << 31)
+#define QSPI_CLK_DIV_MAX 0xffff
+
+/* Command */
+#define QSPI_EN_CS(n) (n << 28)
+#define QSPI_WLEN(n) ((n-1) << 19)
+#define QSPI_3_PIN (1 << 18)
+#define QSPI_RD_SNGL (1 << 16)
+#define QSPI_WR_SNGL (2 << 16)
+#define QSPI_INVAL (4 << 16)
+#define QSPI_RD_QUAD (7 << 16)
+
+/* Device Control */
+#define QSPI_DD(m, n) (m << (3 + n*8))
+#define QSPI_CKPHA(n) (1 << (2 + n*8))
+#define QSPI_CSPOL(n) (1 << (1 + n*8))
+#define QSPI_CKPOL(n) (1 << (n*8))
+
+/* Status */
+#define QSPI_WC (1 << 1)
+#define QSPI_BUSY (1 << 0)
+#define QSPI_WC_BUSY (QSPI_WC | QSPI_BUSY)
+#define QSPI_XFER_DONE QSPI_WC
+
+#define MM_SWITCH 0x01
+#define MEM_CS 0x100
+#define MEM_CS_UNSELECT 0xfffff0ff
+#define MMAP_START_ADDR 0x5c000000
+#define CORE_CTRL_IO 0x4a002558
+
+#define QSPI_CMD_READ (0x3 << 0)
+#define QSPI_CMD_READ_QUAD (0x6b << 0)
+#define QSPI_CMD_READ_FAST (0x0b << 0)
+#define QSPI_SETUP0_NUM_A_BYTES (0x2 << 8)
+#define QSPI_SETUP0_NUM_D_BYTES_NO_BITS (0x0 << 10)
+#define QSPI_SETUP0_NUM_D_BYTES_8_BITS (0x1 << 10)
+#define QSPI_SETUP0_READ_NORMAL (0x0 << 12)
+#define QSPI_SETUP0_READ_QUAD (0x3 << 12)
+#define QSPI_CMD_WRITE (0x2 << 16)
+#define QSPI_NUM_DUMMY_BITS (0x0 << 24)
+
+int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+ return 1;
+}
+
+void spi_cs_activate(struct spi_slave *slave)
+{
+ /* CS handled in xfer */
+ return;
+}
+
+void spi_cs_deactivate(struct spi_slave *slave)
+{
+ /* CS handled in xfer */
+ return;
+}
+
+void spi_init(void)
+{
+ /* nothing to do */
+}
+
+void spi_set_up_spi_register(struct spi_slave *slave)
+{
+ u32 memval = 0;
+
+ slave->memory_map = (void *)MMAP_START_ADDR;
+
+#ifdef CONFIG_SF_QUAD_RD
+ memval |= (QSPI_CMD_READ_QUAD | QSPI_SETUP0_NUM_A_BYTES |
+ QSPI_SETUP0_NUM_D_BYTES_8_BITS | QSPI_SETUP0_READ_QUAD |
+ QSPI_CMD_WRITE | QSPI_NUM_DUMMY_BITS);
+#else
+ memval |= (QSPI_CMD_READ | QSPI_SETUP0_NUM_A_BYTES |
+ QSPI_SETUP0_NUM_D_BYTES_NO_BITS | QSPI_SETUP0_READ_NORMAL |
+ QSPI_CMD_WRITE | QSPI_NUM_DUMMY_BITS);
+#endif
+ writel(memval, &qspi->spi_setup0);
+}
+
+void spi_set_speed(struct spi_slave *slave, uint hz)
+{
+ uint clk_div;
+
+ if (!hz)
+ clk_div = 0;
+ else
+ clk_div = (QSPI_FCLK / hz) - 1;
+
+ debug("%s: hz: %d, clock divider %d\n", __func__, hz, clk_div);
+
+ /* disable SCLK */
+ writel(readl(&qspi->spi_clock_cntrl) & ~QSPI_CLK_EN,
+ &qspi->spi_clock_cntrl);
+
+ if (clk_div < 0) {
+ debug("%s: clock divider < 0, using /1 divider\n", __func__);
+ clk_div = 0;
+ }
+
+ if (clk_div > QSPI_CLK_DIV_MAX) {
+ debug("%s: clock divider >%d , using /%d divider\n",
+ __func__, QSPI_CLK_DIV_MAX, QSPI_CLK_DIV_MAX + 1);
+ clk_div = QSPI_CLK_DIV_MAX;
+ }
+
+ /* enable SCLK */
+ writel(QSPI_CLK_EN | clk_div, &qspi->spi_clock_cntrl);
+ debug("%s: spi_clock_cntrl %08x\n", __func__,
+ readl(&qspi->spi_clock_cntrl));
+}
+
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
+ unsigned int max_hz, unsigned int mode)
+{
+ struct qspi_slave *qslave;
+
+ qslave = spi_alloc_slave(struct qspi_slave, bus, cs);
+ if (!qslave)
+ return NULL;
+
+ spi_set_speed(&qslave->slave, max_hz);
+ qslave->mode = mode;
+
+#ifdef CONFIG_MMAP
+ spi_set_up_spi_register(&qslave->slave);
+#endif
+
+ debug("%s: bus:%i cs:%i mode:%i\n", __func__, bus, cs, mode);
+
+ return &qslave->slave;
+}
+
+void spi_free_slave(struct spi_slave *slave)
+{
+ struct qspi_slave *qslave = to_qspi_slave(slave);
+ free(qslave);
+}
+
+int spi_claim_bus(struct spi_slave *slave)
+{
+ debug("%s: bus:%i cs:%i\n", __func__, slave->bus, slave->cs);
+
+ writel(0, &qspi->spi_dc);
+ writel(0, &qspi->spi_cmd);
+ writel(0, &qspi->spi_data);
+
+ return 0;
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+ debug("%s: bus:%i cs:%i\n", __func__, slave->bus, slave->cs);
+
+ writel(0, &qspi->spi_dc);
+ writel(0, &qspi->spi_cmd);
+ writel(0, &qspi->spi_data);
+}
+
+int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
+ void *din, unsigned long flags)
+{
+ struct qspi_slave *qslave = to_qspi_slave(slave);
+ uint words = bitlen >> 3; /* fixed 8-bit word length */
+ const uchar *txp = dout;
+ uchar *rxp = din;
+ uint status;
+ int timeout, val;
+
+ debug("%s: bus:%i cs:%i bitlen:%i words:%i flags:%lx\n", __func__,
+ slave->bus, slave->cs, bitlen, words, flags);
+
+ qslave->dc = 0;
+ if (qslave->mode & SPI_CPHA)
+ qslave->dc |= QSPI_CKPHA(slave->cs);
+ if (qslave->mode & SPI_CPOL)
+ qslave->dc |= QSPI_CKPOL(slave->cs);
+ if (qslave->mode & SPI_CS_HIGH)
+ qslave->dc |= QSPI_CSPOL(slave->cs);
+
+ writel(qslave->dc, &qspi->spi_dc);
+
+ if (flags & SPI_XFER_MEM_MAP) {
+ writel(MM_SWITCH, &qspi->spi_switch);
+ val = readl(CORE_CTRL_IO);
+ val |= MEM_CS;
+ writel(val, CORE_CTRL_IO);
+ return 0;
+ } else if (flags & SPI_XFER_MEM_MAP_END) {
+ writel(~MM_SWITCH, &qspi->spi_switch);
+ val = readl(CORE_CTRL_IO);
+ val &= MEM_CS_UNSELECT;
+ writel(val, CORE_CTRL_IO);
+ return 0;
+ }
+
+ if (bitlen == 0)
+ goto out;
+
+ if (bitlen % 8) {
+ flags |= SPI_XFER_END;
+ goto out;
+ }
+
+ /* setup command reg */
+ qslave->cmd = 0;
+ qslave->cmd |= QSPI_WLEN(8);
+ qslave->cmd |= QSPI_EN_CS(slave->cs);
+ if (flags & SPI_3WIRE)
+ qslave->cmd |= QSPI_3_PIN;
+ qslave->cmd |= 0xfff;
+
+ while (words--) {
+ if (txp) {
+ debug("tx cmd %08x dc %08x data %02x\n",
+ qslave->cmd | QSPI_WR_SNGL, qslave->dc, *txp);
+ writel(*txp++, &qspi->spi_data);
+ writel(qslave->cmd | QSPI_WR_SNGL, &qspi->spi_cmd);
+ status = readl(&qspi->spi_status);
+ timeout = QSPI_TIMEOUT;
+ while ((status & QSPI_WC_BUSY) != QSPI_XFER_DONE) {
+ if (--timeout < 0) {
+ printf("QSPI tx timed out\n");
+ return -1;
+ }
+ status = readl(&qspi->spi_status);
+ }
+ debug("tx done, status %08x\n", status);
+ }
+ if (rxp) {
+ if (flags & SPI_QUAD)
+ qslave->cmd |= QSPI_RD_QUAD;
+ else
+ qslave->cmd |= QSPI_RD_SNGL;
+ debug("rx cmd %08x dc %08x\n",
+ qslave->cmd, qslave->dc);
+ writel(qslave->cmd, &qspi->spi_cmd);
+ status = readl(&qspi->spi_status);
+ timeout = QSPI_TIMEOUT;
+ while ((status & QSPI_WC_BUSY) != QSPI_XFER_DONE) {
+ if (--timeout < 0) {
+ printf("QSPI rx timed out\n");
+ return -1;
+ }
+ status = readl(&qspi->spi_status);
+ }
+ *rxp++ = readl(&qspi->spi_data);
+ debug("rx done, status %08x, read %02x\n",
+ status, *(rxp-1));
+ }
+ }
+
+out:
+ /* Terminate frame */
+ if (flags & SPI_XFER_END)
+ writel(qslave->cmd | QSPI_INVAL, &qspi->spi_cmd);
+
+ return 0;
+}
--
1.7.1
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