+// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2000-2003
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
* TsiChung Liew (Tsi-Chung.Liew@freescale.com)
* Chao Fu (B44548@freescale.com)
* Haikun Wang (B53464@freescale.com)
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
+
+#include <linux/math64.h>
+#include <common.h>
#include <dm.h>
#include <errno.h>
#include <common.h>
+#include <log.h>
#include <spi.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#endif
#include <fsl_dspi.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+
+/* linux/include/time.h */
+#define NSEC_PER_SEC 1000000000L
DECLARE_GLOBAL_DATA_PTR;
/* fsl_dspi_platdata flags */
-#define DSPI_FLAG_REGMAP_ENDIAN_BIG (1 << 0)
+#define DSPI_FLAG_REGMAP_ENDIAN_BIG BIT(0)
/* idle data value */
#define DSPI_IDLE_VAL 0x0
struct dspi *regs;
};
-#ifndef CONFIG_DM_SPI
-struct fsl_dspi {
- struct spi_slave slave;
- struct fsl_dspi_priv priv;
-};
-#endif
-
__weak void cpu_dspi_port_conf(void)
{
}
if (len > 1) {
int tmp_len = len - 1;
while (tmp_len--) {
- if (dout != NULL) {
+ if ((dout != NULL) && (din != NULL)) {
+ if (priv->charbit == 16) {
+ dspi_tx(priv, ctrl, *spi_wr16++);
+ *spi_rd16++ = dspi_rx(priv);
+ }
+ else {
+ dspi_tx(priv, ctrl, *spi_wr++);
+ *spi_rd++ = dspi_rx(priv);
+ }
+ }
+
+ else if (dout != NULL) {
if (priv->charbit == 16)
dspi_tx(priv, ctrl, *spi_wr16++);
else
dspi_rx(priv);
}
- if (din != NULL) {
+ else if (din != NULL) {
dspi_tx(priv, ctrl, DSPI_IDLE_VAL);
if (priv->charbit == 16)
*spi_rd16++ = dspi_rx(priv);
ctrl &= ~DSPI_TFR_CONT;
if (len) {
- if (dout != NULL) {
+ if ((dout != NULL) && (din != NULL)) {
+ if (priv->charbit == 16) {
+ dspi_tx(priv, ctrl, *spi_wr16++);
+ *spi_rd16++ = dspi_rx(priv);
+ }
+ else {
+ dspi_tx(priv, ctrl, *spi_wr++);
+ *spi_rd++ = dspi_rx(priv);
+ }
+ }
+
+ else if (dout != NULL) {
if (priv->charbit == 16)
dspi_tx(priv, ctrl, *spi_wr16);
else
dspi_rx(priv);
}
- if (din != NULL) {
+ else if (din != NULL) {
dspi_tx(priv, ctrl, DSPI_IDLE_VAL);
if (priv->charbit == 16)
*spi_rd16 = dspi_rx(priv);
return -EINVAL;
}
+static void ns_delay_scale(unsigned char *psc, unsigned char *sc, int delay_ns,
+ unsigned long clkrate)
+{
+ int scale_needed, scale, minscale = INT_MAX;
+ int pscale_tbl[4] = {1, 3, 5, 7};
+ u32 remainder;
+ int i, j;
+
+ scale_needed = div_u64_rem((u64)delay_ns * clkrate, NSEC_PER_SEC,
+ &remainder);
+ if (remainder)
+ scale_needed++;
+
+ for (i = 0; i < ARRAY_SIZE(pscale_tbl); i++)
+ for (j = 0; j <= DSPI_CTAR_SCALE_BITS; j++) {
+ scale = pscale_tbl[i] * (2 << j);
+ if (scale >= scale_needed) {
+ if (scale < minscale) {
+ minscale = scale;
+ *psc = i;
+ *sc = j;
+ }
+ break;
+ }
+ }
+
+ if (minscale == INT_MAX) {
+ pr_warn("Cannot find correct scale values for %dns delay at clkrate %ld, using max prescaler value",
+ delay_ns, clkrate);
+ *psc = ARRAY_SIZE(pscale_tbl) - 1;
+ *sc = DSPI_CTAR_SCALE_BITS;
+ }
+}
+
static int fsl_dspi_cfg_speed(struct fsl_dspi_priv *priv, uint speed)
{
int ret;
return 0;
}
-#ifndef CONFIG_DM_SPI
-void spi_init(void)
-{
- /* Nothing to do */
-}
-void spi_init_f(void)
-{
- /* Nothing to do */
-}
-
-void spi_init_r(void)
-{
- /* Nothing to do */
-}
-
-int spi_cs_is_valid(unsigned int bus, unsigned int cs)
-{
- if (((cs >= 0) && (cs < 8)) && ((bus >= 0) && (bus < 8)))
- return 1;
- else
- return 0;
-}
-
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
- unsigned int max_hz, unsigned int mode)
-{
- struct fsl_dspi *dspi;
- uint mcr_cfg_val;
-
- dspi = spi_alloc_slave(struct fsl_dspi, bus, cs);
- if (!dspi)
- return NULL;
-
- cpu_dspi_port_conf();
-
-#ifdef CONFIG_SYS_FSL_DSPI_BE
- dspi->priv.flags |= DSPI_FLAG_REGMAP_ENDIAN_BIG;
-#endif
-
- dspi->priv.regs = (struct dspi *)MMAP_DSPI;
-
-#ifdef CONFIG_M68K
- dspi->priv.bus_clk = gd->bus_clk;
-#else
- dspi->priv.bus_clk = mxc_get_clock(MXC_DSPI_CLK);
-#endif
- dspi->priv.speed_hz = FSL_DSPI_DEFAULT_SCK_FREQ;
-
- /* default: all CS signals inactive state is high */
- mcr_cfg_val = DSPI_MCR_MSTR | DSPI_MCR_PCSIS_MASK |
- DSPI_MCR_CRXF | DSPI_MCR_CTXF;
- fsl_dspi_init_mcr(&dspi->priv, mcr_cfg_val);
-
- for (i = 0; i < FSL_DSPI_MAX_CHIPSELECT; i++)
- dspi->priv.ctar_val[i] = DSPI_CTAR_DEFAULT_VALUE;
-
-#ifdef CONFIG_SYS_DSPI_CTAR0
- if (FSL_DSPI_MAX_CHIPSELECT > 0)
- dspi->priv.ctar_val[0] = CONFIG_SYS_DSPI_CTAR0;
-#endif
-#ifdef CONFIG_SYS_DSPI_CTAR1
- if (FSL_DSPI_MAX_CHIPSELECT > 1)
- dspi->priv.ctar_val[1] = CONFIG_SYS_DSPI_CTAR1;
-#endif
-#ifdef CONFIG_SYS_DSPI_CTAR2
- if (FSL_DSPI_MAX_CHIPSELECT > 2)
- dspi->priv.ctar_val[2] = CONFIG_SYS_DSPI_CTAR2;
-#endif
-#ifdef CONFIG_SYS_DSPI_CTAR3
- if (FSL_DSPI_MAX_CHIPSELECT > 3)
- dspi->priv.ctar_val[3] = CONFIG_SYS_DSPI_CTAR3;
-#endif
-#ifdef CONFIG_SYS_DSPI_CTAR4
- if (FSL_DSPI_MAX_CHIPSELECT > 4)
- dspi->priv.ctar_val[4] = CONFIG_SYS_DSPI_CTAR4;
-#endif
-#ifdef CONFIG_SYS_DSPI_CTAR5
- if (FSL_DSPI_MAX_CHIPSELECT > 5)
- dspi->priv.ctar_val[5] = CONFIG_SYS_DSPI_CTAR5;
-#endif
-#ifdef CONFIG_SYS_DSPI_CTAR6
- if (FSL_DSPI_MAX_CHIPSELECT > 6)
- dspi->priv.ctar_val[6] = CONFIG_SYS_DSPI_CTAR6;
-#endif
-#ifdef CONFIG_SYS_DSPI_CTAR7
- if (FSL_DSPI_MAX_CHIPSELECT > 7)
- dspi->priv.ctar_val[7] = CONFIG_SYS_DSPI_CTAR7;
-#endif
-
- fsl_dspi_cfg_speed(&dspi->priv, max_hz);
-
- /* configure transfer mode */
- fsl_dspi_cfg_ctar_mode(&dspi->priv, cs, mode);
-
- /* configure active state of CSX */
- fsl_dspi_cfg_cs_active_state(&dspi->priv, cs, mode);
-
- return &dspi->slave;
-}
-
-void spi_free_slave(struct spi_slave *slave)
-{
- free(slave);
-}
-
-int spi_claim_bus(struct spi_slave *slave)
-{
- uint sr_val;
- struct fsl_dspi *dspi = (struct fsl_dspi *)slave;
-
- cpu_dspi_claim_bus(slave->bus, slave->cs);
-
- fsl_dspi_clr_fifo(&dspi->priv);
-
- /* check module TX and RX status */
- sr_val = dspi_read32(dspi->priv.flags, &dspi->priv.regs->sr);
- if ((sr_val & DSPI_SR_TXRXS) != DSPI_SR_TXRXS) {
- debug("DSPI RX/TX not ready!\n");
- return -EIO;
- }
-
- return 0;
-}
-
-void spi_release_bus(struct spi_slave *slave)
-{
- struct fsl_dspi *dspi = (struct fsl_dspi *)slave;
-
- dspi_halt(&dspi->priv, 1);
- cpu_dspi_release_bus(slave->bus.slave->cs);
-}
-
-int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
- void *din, unsigned long flags)
-{
- struct fsl_dspi *dspi = (struct fsl_dspi *)slave;
- return dspi_xfer(&dspi->priv, slave->cs, bitlen, dout, din, flags);
-}
-#else
static int fsl_dspi_child_pre_probe(struct udevice *dev)
{
struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
struct fsl_dspi_priv *priv = dev_get_priv(dev->parent);
+ u32 cs_sck_delay = 0, sck_cs_delay = 0;
+ unsigned char pcssck = 0, cssck = 0;
+ unsigned char pasc = 0, asc = 0;
if (slave_plat->cs >= priv->num_chipselect) {
debug("DSPI invalid chipselect number %d(max %d)!\n",
return -EINVAL;
}
- priv->ctar_val[slave_plat->cs] = DSPI_CTAR_DEFAULT_VALUE;
+ ofnode_read_u32(dev->node, "fsl,spi-cs-sck-delay", &cs_sck_delay);
+ ofnode_read_u32(dev->node, "fsl,spi-sck-cs-delay", &sck_cs_delay);
+
+ /* Set PCS to SCK delay scale values */
+ ns_delay_scale(&pcssck, &cssck, cs_sck_delay, priv->bus_clk);
+
+ /* Set After SCK delay scale values */
+ ns_delay_scale(&pasc, &asc, sck_cs_delay, priv->bus_clk);
+
+ priv->ctar_val[slave_plat->cs] = DSPI_CTAR_DEFAULT_VALUE |
+ DSPI_CTAR_PCSSCK(pcssck) |
+ DSPI_CTAR_PASC(pasc);
debug("DSPI pre_probe slave device on CS %u, max_hz %u, mode 0x%x.\n",
slave_plat->cs, slave_plat->max_hz, slave_plat->mode);
priv = dev_get_priv(bus);
- /* processor special prepartion work */
+ /* processor special preparation work */
cpu_dspi_claim_bus(bus->seq, slave_plat->cs);
/* configure transfer mode */
fdt_addr_t addr;
struct fsl_dspi_platdata *plat = bus->platdata;
const void *blob = gd->fdt_blob;
- int node = bus->of_offset;
+ int node = dev_of_offset(bus);
if (fdtdec_get_bool(blob, node, "big-endian"))
plat->flags |= DSPI_FLAG_REGMAP_ENDIAN_BIG;
plat->num_chipselect =
fdtdec_get_int(blob, node, "num-cs", FSL_DSPI_MAX_CHIPSELECT);
- addr = dev_get_addr(bus);
+ addr = dev_read_addr(bus);
if (addr == FDT_ADDR_T_NONE) {
debug("DSPI: Can't get base address or size\n");
return -ENOMEM;
.child_pre_probe = fsl_dspi_child_pre_probe,
.bind = fsl_dspi_bind,
};
-#endif
projects / platform / kernel / u-boot.git / blobdiff