tegra114: add SPI driver
Add driver for tegra114 SPI controller. This controller is not
compatible with either the tegra20 or tegra30 controllers, so it
requires a new driver.
Signed-off-by: Allen Martin <amartin@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
diff --git a/drivers/spi/tegra114_spi.c b/drivers/spi/tegra114_spi.c
new file mode 100644
index 0000000..b11a0a1
--- /dev/null
+++ b/drivers/spi/tegra114_spi.c
@@ -0,0 +1,405 @@
+/*
+ * NVIDIA Tegra SPI controller (T114 and later)
+ *
+ * Copyright (c) 2010-2013 NVIDIA Corporation
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+#include <asm/arch/clock.h>
+#include <asm/arch-tegra/clk_rst.h>
+#include <asm/arch-tegra114/tegra114_spi.h>
+#include <spi.h>
+#include <fdtdec.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* COMMAND1 */
+#define SPI_CMD1_GO (1 << 31)
+#define SPI_CMD1_M_S (1 << 30)
+#define SPI_CMD1_MODE_MASK 0x3
+#define SPI_CMD1_MODE_SHIFT 28
+#define SPI_CMD1_CS_SEL_MASK 0x3
+#define SPI_CMD1_CS_SEL_SHIFT 26
+#define SPI_CMD1_CS_POL_INACTIVE3 (1 << 25)
+#define SPI_CMD1_CS_POL_INACTIVE2 (1 << 24)
+#define SPI_CMD1_CS_POL_INACTIVE1 (1 << 23)
+#define SPI_CMD1_CS_POL_INACTIVE0 (1 << 22)
+#define SPI_CMD1_CS_SW_HW (1 << 21)
+#define SPI_CMD1_CS_SW_VAL (1 << 20)
+#define SPI_CMD1_IDLE_SDA_MASK 0x3
+#define SPI_CMD1_IDLE_SDA_SHIFT 18
+#define SPI_CMD1_BIDIR (1 << 17)
+#define SPI_CMD1_LSBI_FE (1 << 16)
+#define SPI_CMD1_LSBY_FE (1 << 15)
+#define SPI_CMD1_BOTH_EN_BIT (1 << 14)
+#define SPI_CMD1_BOTH_EN_BYTE (1 << 13)
+#define SPI_CMD1_RX_EN (1 << 12)
+#define SPI_CMD1_TX_EN (1 << 11)
+#define SPI_CMD1_PACKED (1 << 5)
+#define SPI_CMD1_BIT_LEN_MASK 0x1F
+#define SPI_CMD1_BIT_LEN_SHIFT 0
+
+/* COMMAND2 */
+#define SPI_CMD2_TX_CLK_TAP_DELAY (1 << 6)
+#define SPI_CMD2_TX_CLK_TAP_DELAY_MASK (0x3F << 6)
+#define SPI_CMD2_RX_CLK_TAP_DELAY (1 << 0)
+#define SPI_CMD2_RX_CLK_TAP_DELAY_MASK (0x3F << 0)
+
+/* TRANSFER STATUS */
+#define SPI_XFER_STS_RDY (1 << 30)
+
+/* FIFO STATUS */
+#define SPI_FIFO_STS_CS_INACTIVE (1 << 31)
+#define SPI_FIFO_STS_FRAME_END (1 << 30)
+#define SPI_FIFO_STS_RX_FIFO_FLUSH (1 << 15)
+#define SPI_FIFO_STS_TX_FIFO_FLUSH (1 << 14)
+#define SPI_FIFO_STS_ERR (1 << 8)
+#define SPI_FIFO_STS_TX_FIFO_OVF (1 << 7)
+#define SPI_FIFO_STS_TX_FIFO_UNR (1 << 6)
+#define SPI_FIFO_STS_RX_FIFO_OVF (1 << 5)
+#define SPI_FIFO_STS_RX_FIFO_UNR (1 << 4)
+#define SPI_FIFO_STS_TX_FIFO_FULL (1 << 3)
+#define SPI_FIFO_STS_TX_FIFO_EMPTY (1 << 2)
+#define SPI_FIFO_STS_RX_FIFO_FULL (1 << 1)
+#define SPI_FIFO_STS_RX_FIFO_EMPTY (1 << 0)
+
+#define SPI_TIMEOUT 1000
+#define TEGRA_SPI_MAX_FREQ 52000000
+
+struct spi_regs {
+ u32 command1; /* 000:SPI_COMMAND1 register */
+ u32 command2; /* 004:SPI_COMMAND2 register */
+ u32 timing1; /* 008:SPI_CS_TIM1 register */
+ u32 timing2; /* 00c:SPI_CS_TIM2 register */
+ u32 xfer_status;/* 010:SPI_TRANS_STATUS register */
+ u32 fifo_status;/* 014:SPI_FIFO_STATUS register */
+ u32 tx_data; /* 018:SPI_TX_DATA register */
+ u32 rx_data; /* 01c:SPI_RX_DATA register */
+ u32 dma_ctl; /* 020:SPI_DMA_CTL register */
+ u32 dma_blk; /* 024:SPI_DMA_BLK register */
+ u32 rsvd[56]; /* 028-107 reserved */
+ u32 tx_fifo; /* 108:SPI_FIFO1 register */
+ u32 rsvd2[31]; /* 10c-187 reserved */
+ u32 rx_fifo; /* 188:SPI_FIFO2 register */
+ u32 spare_ctl; /* 18c:SPI_SPARE_CTRL register */
+};
+
+struct tegra_spi_ctrl {
+ struct spi_regs *regs;
+ unsigned int freq;
+ unsigned int mode;
+ int periph_id;
+ int valid;
+};
+
+struct tegra_spi_slave {
+ struct spi_slave slave;
+ struct tegra_spi_ctrl *ctrl;
+};
+
+static struct tegra_spi_ctrl spi_ctrls[CONFIG_TEGRA114_SPI_CTRLS];
+
+static inline struct tegra_spi_slave *to_tegra_spi(struct spi_slave *slave)
+{
+ return container_of(slave, struct tegra_spi_slave, slave);
+}
+
+int tegra114_spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+ if (bus >= CONFIG_TEGRA114_SPI_CTRLS || cs > 3 || !spi_ctrls[bus].valid)
+ return 0;
+ else
+ return 1;
+}
+
+struct spi_slave *tegra114_spi_setup_slave(unsigned int bus, unsigned int cs,
+ unsigned int max_hz, unsigned int mode)
+{
+ struct tegra_spi_slave *spi;
+
+ debug("%s: bus: %u, cs: %u, max_hz: %u, mode: %u\n", __func__,
+ bus, cs, max_hz, mode);
+
+ if (!spi_cs_is_valid(bus, cs)) {
+ printf("SPI error: unsupported bus %d / chip select %d\n",
+ bus, cs);
+ return NULL;
+ }
+
+ if (max_hz > TEGRA_SPI_MAX_FREQ) {
+ printf("SPI error: unsupported frequency %d Hz. Max frequency"
+ " is %d Hz\n", max_hz, TEGRA_SPI_MAX_FREQ);
+ return NULL;
+ }
+
+ spi = malloc(sizeof(struct tegra_spi_slave));
+ if (!spi) {
+ printf("SPI error: malloc of SPI structure failed\n");
+ return NULL;
+ }
+ spi->slave.bus = bus;
+ spi->slave.cs = cs;
+ spi->ctrl = &spi_ctrls[bus];
+ if (!spi->ctrl) {
+ printf("SPI error: could not find controller for bus %d\n",
+ bus);
+ return NULL;
+ }
+
+ if (max_hz < spi->ctrl->freq) {
+ debug("%s: limiting frequency from %u to %u\n", __func__,
+ spi->ctrl->freq, max_hz);
+ spi->ctrl->freq = max_hz;
+ }
+ spi->ctrl->mode = mode;
+
+ return &spi->slave;
+}
+
+void tegra114_spi_free_slave(struct spi_slave *slave)
+{
+ struct tegra_spi_slave *spi = to_tegra_spi(slave);
+
+ free(spi);
+}
+
+int tegra114_spi_init(int *node_list, int count)
+{
+ struct tegra_spi_ctrl *ctrl;
+ int i;
+ int node = 0;
+ int found = 0;
+
+ for (i = 0; i < count; i++) {
+ ctrl = &spi_ctrls[i];
+ node = node_list[i];
+
+ ctrl->regs = (struct spi_regs *)fdtdec_get_addr(gd->fdt_blob,
+ node, "reg");
+ if ((fdt_addr_t)ctrl->regs == FDT_ADDR_T_NONE) {
+ debug("%s: no spi register found\n", __func__);
+ continue;
+ }
+ ctrl->freq = fdtdec_get_int(gd->fdt_blob, node,
+ "spi-max-frequency", 0);
+ if (!ctrl->freq) {
+ debug("%s: no spi max frequency found\n", __func__);
+ continue;
+ }
+
+ ctrl->periph_id = clock_decode_periph_id(gd->fdt_blob, node);
+ if (ctrl->periph_id == PERIPH_ID_NONE) {
+ debug("%s: could not decode periph id\n", __func__);
+ continue;
+ }
+ ctrl->valid = 1;
+ found = 1;
+
+ debug("%s: found controller at %p, freq = %u, periph_id = %d\n",
+ __func__, ctrl->regs, ctrl->freq, ctrl->periph_id);
+ }
+
+ return !found;
+}
+
+int tegra114_spi_claim_bus(struct spi_slave *slave)
+{
+ struct tegra_spi_slave *spi = to_tegra_spi(slave);
+ struct spi_regs *regs = spi->ctrl->regs;
+
+ /* Change SPI clock to correct frequency, PLLP_OUT0 source */
+ clock_start_periph_pll(spi->ctrl->periph_id, CLOCK_ID_PERIPH,
+ spi->ctrl->freq);
+
+ /* Clear stale status here */
+ setbits_le32(®s->fifo_status,
+ SPI_FIFO_STS_ERR |
+ SPI_FIFO_STS_TX_FIFO_OVF |
+ SPI_FIFO_STS_TX_FIFO_UNR |
+ SPI_FIFO_STS_RX_FIFO_OVF |
+ SPI_FIFO_STS_RX_FIFO_UNR |
+ SPI_FIFO_STS_TX_FIFO_FULL |
+ SPI_FIFO_STS_TX_FIFO_EMPTY |
+ SPI_FIFO_STS_RX_FIFO_FULL |
+ SPI_FIFO_STS_RX_FIFO_EMPTY);
+ debug("%s: FIFO STATUS = %08x\n", __func__, readl(®s->fifo_status));
+
+ /* Set master mode and sw controlled CS */
+ setbits_le32(®s->command1, SPI_CMD1_M_S | SPI_CMD1_CS_SW_HW |
+ (spi->ctrl->mode << SPI_CMD1_MODE_SHIFT));
+ debug("%s: COMMAND1 = %08x\n", __func__, readl(®s->command1));
+
+ return 0;
+}
+
+void tegra114_spi_cs_activate(struct spi_slave *slave)
+{
+ struct tegra_spi_slave *spi = to_tegra_spi(slave);
+ struct spi_regs *regs = spi->ctrl->regs;
+
+ clrbits_le32(®s->command1, SPI_CMD1_CS_SW_VAL);
+}
+
+void tegra114_spi_cs_deactivate(struct spi_slave *slave)
+{
+ struct tegra_spi_slave *spi = to_tegra_spi(slave);
+ struct spi_regs *regs = spi->ctrl->regs;
+
+ setbits_le32(®s->command1, SPI_CMD1_CS_SW_VAL);
+}
+
+int tegra114_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
+ const void *data_out, void *data_in, unsigned long flags)
+{
+ struct tegra_spi_slave *spi = to_tegra_spi(slave);
+ struct spi_regs *regs = spi->ctrl->regs;
+ u32 reg, tmpdout, tmpdin = 0;
+ const u8 *dout = data_out;
+ u8 *din = data_in;
+ int num_bytes;
+ int ret;
+
+ debug("%s: slave %u:%u dout %p din %p bitlen %u\n",
+ __func__, slave->bus, slave->cs, dout, din, bitlen);
+ if (bitlen % 8)
+ return -1;
+ num_bytes = bitlen / 8;
+
+ ret = 0;
+
+ /* clear all error status bits */
+ reg = readl(®s->fifo_status);
+ writel(reg, ®s->fifo_status);
+
+ /* clear ready bit */
+ setbits_le32(®s->xfer_status, SPI_XFER_STS_RDY);
+
+ clrsetbits_le32(®s->command1, SPI_CMD1_CS_SW_VAL,
+ SPI_CMD1_RX_EN | SPI_CMD1_TX_EN | SPI_CMD1_LSBY_FE |
+ (slave->cs << SPI_CMD1_CS_SEL_SHIFT));
+
+ /* set xfer size to 1 block (32 bits) */
+ writel(0, ®s->dma_blk);
+
+ if (flags & SPI_XFER_BEGIN)
+ spi_cs_activate(slave);
+
+ /* handle data in 32-bit chunks */
+ while (num_bytes > 0) {
+ int bytes;
+ int is_read = 0;
+ int tm, i;
+
+ tmpdout = 0;
+ bytes = (num_bytes > 4) ? 4 : num_bytes;
+
+ if (dout != NULL) {
+ for (i = 0; i < bytes; ++i)
+ tmpdout = (tmpdout << 8) | dout[i];
+ dout += bytes;
+ }
+
+ num_bytes -= bytes;
+
+ clrsetbits_le32(®s->command1,
+ SPI_CMD1_BIT_LEN_MASK << SPI_CMD1_BIT_LEN_SHIFT,
+ (bytes * 8 - 1) << SPI_CMD1_BIT_LEN_SHIFT);
+ writel(tmpdout, ®s->tx_fifo);
+ setbits_le32(®s->command1, SPI_CMD1_GO);
+
+ /*
+ * Wait for SPI transmit FIFO to empty, or to time out.
+ * The RX FIFO status will be read and cleared last
+ */
+ for (tm = 0, is_read = 0; tm < SPI_TIMEOUT; ++tm) {
+ u32 fifo_status, xfer_status;
+
+ fifo_status = readl(®s->fifo_status);
+
+ /* We can exit when we've had both RX and TX activity */
+ if (is_read &&
+ (fifo_status & SPI_FIFO_STS_TX_FIFO_EMPTY))
+ break;
+
+ xfer_status = readl(®s->xfer_status);
+ if (!(xfer_status & SPI_XFER_STS_RDY))
+ continue;
+
+ if (fifo_status & SPI_FIFO_STS_ERR) {
+ debug("%s: got a fifo error: ", __func__);
+ if (fifo_status & SPI_FIFO_STS_TX_FIFO_OVF)
+ debug("tx FIFO overflow ");
+ if (fifo_status & SPI_FIFO_STS_TX_FIFO_UNR)
+ debug("tx FIFO underrun ");
+ if (fifo_status & SPI_FIFO_STS_RX_FIFO_OVF)
+ debug("rx FIFO overflow ");
+ if (fifo_status & SPI_FIFO_STS_RX_FIFO_UNR)
+ debug("rx FIFO underrun ");
+ if (fifo_status & SPI_FIFO_STS_TX_FIFO_FULL)
+ debug("tx FIFO full ");
+ if (fifo_status & SPI_FIFO_STS_TX_FIFO_EMPTY)
+ debug("tx FIFO empty ");
+ if (fifo_status & SPI_FIFO_STS_RX_FIFO_FULL)
+ debug("rx FIFO full ");
+ if (fifo_status & SPI_FIFO_STS_RX_FIFO_EMPTY)
+ debug("rx FIFO empty ");
+ debug("\n");
+ break;
+ }
+
+ if (!(fifo_status & SPI_FIFO_STS_RX_FIFO_EMPTY)) {
+ tmpdin = readl(®s->rx_fifo);
+ is_read = 1;
+
+ /* swap bytes read in */
+ if (din != NULL) {
+ for (i = bytes - 1; i >= 0; --i) {
+ din[i] = tmpdin & 0xff;
+ tmpdin >>= 8;
+ }
+ din += bytes;
+ }
+ }
+ }
+
+ if (tm >= SPI_TIMEOUT)
+ ret = tm;
+
+ /* clear ACK RDY, etc. bits */
+ writel(readl(®s->fifo_status), ®s->fifo_status);
+ }
+
+ if (flags & SPI_XFER_END)
+ spi_cs_deactivate(slave);
+
+ debug("%s: transfer ended. Value=%08x, fifo_status = %08x\n",
+ __func__, tmpdin, readl(®s->fifo_status));
+
+ if (ret) {
+ printf("%s: timeout during SPI transfer, tm %d\n",
+ __func__, ret);
+ return -1;
+ }
+
+ return 0;
+}