*
* 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
+ * SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <asm/arch/clock.h>
#include <asm/arch-tegra/clk_rst.h>
#include <spi.h>
-#include <fdtdec.h>
#include "tegra_spi.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_GO BIT(31)
+#define SPI_CMD1_M_S BIT(30)
+#define SPI_CMD1_MODE_MASK GENMASK(1, 0)
#define SPI_CMD1_MODE_SHIFT 28
-#define SPI_CMD1_CS_SEL_MASK 0x3
+#define SPI_CMD1_CS_SEL_MASK GENMASK(1, 0)
#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_CS_POL_INACTIVE3 BIT(25)
+#define SPI_CMD1_CS_POL_INACTIVE2 BIT(24)
+#define SPI_CMD1_CS_POL_INACTIVE1 BIT(23)
+#define SPI_CMD1_CS_POL_INACTIVE0 BIT(22)
+#define SPI_CMD1_CS_SW_HW BIT(21)
+#define SPI_CMD1_CS_SW_VAL BIT(20)
+#define SPI_CMD1_IDLE_SDA_MASK GENMASK(1, 0)
#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_BIDIR BIT(17)
+#define SPI_CMD1_LSBI_FE BIT(16)
+#define SPI_CMD1_LSBY_FE BIT(15)
+#define SPI_CMD1_BOTH_EN_BIT BIT(14)
+#define SPI_CMD1_BOTH_EN_BYTE BIT(13)
+#define SPI_CMD1_RX_EN BIT(12)
+#define SPI_CMD1_TX_EN BIT(11)
+#define SPI_CMD1_PACKED BIT(5)
+#define SPI_CMD1_BIT_LEN_MASK GENMASK(4, 0)
#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)
+#define SPI_CMD2_TX_CLK_TAP_DELAY BIT(6)
+#define SPI_CMD2_TX_CLK_TAP_DELAY_MASK GENMASK(11, 6)
+#define SPI_CMD2_RX_CLK_TAP_DELAY BIT(0)
+#define SPI_CMD2_RX_CLK_TAP_DELAY_MASK GENMASK(5, 0)
/* TRANSFER STATUS */
-#define SPI_XFER_STS_RDY (1 << 30)
+#define SPI_XFER_STS_RDY BIT(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_FIFO_STS_CS_INACTIVE BIT(31)
+#define SPI_FIFO_STS_FRAME_END BIT(30)
+#define SPI_FIFO_STS_RX_FIFO_FLUSH BIT(15)
+#define SPI_FIFO_STS_TX_FIFO_FLUSH BIT(14)
+#define SPI_FIFO_STS_ERR BIT(8)
+#define SPI_FIFO_STS_TX_FIFO_OVF BIT(7)
+#define SPI_FIFO_STS_TX_FIFO_UNR BIT(6)
+#define SPI_FIFO_STS_RX_FIFO_OVF BIT(5)
+#define SPI_FIFO_STS_RX_FIFO_UNR BIT(4)
+#define SPI_FIFO_STS_TX_FIFO_FULL BIT(3)
+#define SPI_FIFO_STS_TX_FIFO_EMPTY BIT(2)
+#define SPI_FIFO_STS_RX_FIFO_FULL BIT(1)
+#define SPI_FIFO_STS_RX_FIFO_EMPTY BIT(0)
#define SPI_TIMEOUT 1000
#define TEGRA_SPI_MAX_FREQ 52000000
static int tegra114_spi_ofdata_to_platdata(struct udevice *bus)
{
struct tegra_spi_platdata *plat = bus->platdata;
- const void *blob = gd->fdt_blob;
- int node = bus->of_offset;
- plat->base = fdtdec_get_addr(blob, node, "reg");
- plat->periph_id = clock_decode_periph_id(blob, node);
+ plat->base = dev_read_addr(bus);
+ plat->periph_id = clock_decode_periph_id(bus);
if (plat->periph_id == PERIPH_ID_NONE) {
debug("%s: could not decode periph id %d\n", __func__,
}
/* Use 500KHz as a suitable default */
- plat->frequency = fdtdec_get_int(blob, node, "spi-max-frequency",
- 500000);
- plat->deactivate_delay_us = fdtdec_get_int(blob, node,
- "spi-deactivate-delay", 0);
+ plat->frequency = dev_read_u32_default(bus, "spi-max-frequency",
+ 500000);
+ plat->deactivate_delay_us = dev_read_u32_default(bus,
+ "spi-deactivate-delay", 0);
debug("%s: base=%#08lx, periph_id=%d, max-frequency=%d, deactivate_delay=%d\n",
__func__, plat->base, plat->periph_id, plat->frequency,
plat->deactivate_delay_us);
{
struct tegra_spi_platdata *plat = dev_get_platdata(bus);
struct tegra114_spi_priv *priv = dev_get_priv(bus);
+ struct spi_regs *regs;
+ ulong rate;
priv->regs = (struct spi_regs *)plat->base;
+ regs = priv->regs;
priv->last_transaction_us = timer_get_us();
priv->freq = plat->frequency;
priv->periph_id = plat->periph_id;
- return 0;
-}
-
-static int tegra114_spi_claim_bus(struct udevice *bus)
-{
- struct tegra114_spi_priv *priv = dev_get_priv(bus);
- struct spi_regs *regs = priv->regs;
-
- /* Change SPI clock to correct frequency, PLLP_OUT0 source */
- clock_start_periph_pll(priv->periph_id, CLOCK_ID_PERIPH, priv->freq);
+ /*
+ * Change SPI clock to correct frequency, PLLP_OUT0 source, falling
+ * back to the oscillator if that is too fast.
+ */
+ rate = clock_start_periph_pll(priv->periph_id, CLOCK_ID_PERIPH,
+ priv->freq);
+ if (rate > priv->freq + 100000) {
+ rate = clock_start_periph_pll(priv->periph_id, CLOCK_ID_OSC,
+ priv->freq);
+ if (rate != priv->freq) {
+ printf("Warning: SPI '%s' requested clock %u, actual clock %lu\n",
+ bus->name, priv->freq, rate);
+ }
+ }
+ udelay(plat->deactivate_delay_us);
/* Clear stale status here */
setbits_le32(®s->fifo_status,
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 |
- (priv->mode << SPI_CMD1_MODE_SHIFT));
+ setbits_le32(&priv->regs->command1, SPI_CMD1_M_S | SPI_CMD1_CS_SW_HW |
+ (priv->mode << SPI_CMD1_MODE_SHIFT) | SPI_CMD1_CS_SW_VAL);
debug("%s: COMMAND1 = %08x\n", __func__, readl(®s->command1));
return 0;
ret = 0;
+ if (flags & SPI_XFER_BEGIN)
+ spi_cs_activate(dev);
+
/* clear all error status bits */
reg = readl(®s->fifo_status);
writel(reg, ®s->fifo_status);
/* set xfer size to 1 block (32 bits) */
writel(0, ®s->dma_blk);
- if (flags & SPI_XFER_BEGIN)
- spi_cs_activate(dev);
-
/* handle data in 32-bit chunks */
while (num_bytes > 0) {
int bytes;
}
static const struct dm_spi_ops tegra114_spi_ops = {
- .claim_bus = tegra114_spi_claim_bus,
.xfer = tegra114_spi_xfer,
.set_speed = tegra114_spi_set_speed,
.set_mode = tegra114_spi_set_mode,
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