* eSPI controller driver.
*
* Copyright 2010-2011 Freescale Semiconductor, Inc.
+ * Copyright 2020 NXP
* Author: Mingkai Hu (Mingkai.hu@freescale.com)
+ * Chuanhua Han (chuanhua.han@nxp.com)
*/
#include <common.h>
#include <malloc.h>
#include <spi.h>
#include <asm/immap_85xx.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <dm/platform_data/fsl_espi.h>
struct fsl_spi_slave {
struct spi_slave slave;
ccsr_espi_t *espi;
+ u32 speed_hz;
+ unsigned int cs;
unsigned int div16;
unsigned int pm;
int tx_timeout;
#define to_fsl_spi_slave(s) container_of(s, struct fsl_spi_slave, slave)
#define US_PER_SECOND 1000000UL
+/* default SCK frequency, unit: HZ */
+#define FSL_ESPI_DEFAULT_SCK_FREQ 10000000
+
#define ESPI_MAX_CS_NUM 4
#define ESPI_FIFO_WIDTH_BIT 32
#define ESPI_MAX_DATA_TRANSFER_LEN 0xFFF0
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
- unsigned int max_hz, unsigned int mode)
-{
- struct fsl_spi_slave *fsl;
- sys_info_t sysinfo;
- unsigned long spibrg = 0;
- unsigned long spi_freq = 0;
- unsigned char pm = 0;
-
- if (!spi_cs_is_valid(bus, cs))
- return NULL;
-
- fsl = spi_alloc_slave(struct fsl_spi_slave, bus, cs);
- if (!fsl)
- return NULL;
-
- fsl->espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR);
- fsl->mode = mode;
- fsl->max_transfer_length = ESPI_MAX_DATA_TRANSFER_LEN;
-
- /* Set eSPI BRG clock source */
- get_sys_info(&sysinfo);
- spibrg = sysinfo.freq_systembus / 2;
- fsl->div16 = 0;
- if ((spibrg / max_hz) > 32) {
- fsl->div16 = ESPI_CSMODE_DIV16;
- pm = spibrg / (max_hz * 16 * 2);
- if (pm > 16) {
- pm = 16;
- debug("Requested speed is too low: %d Hz, %ld Hz "
- "is used.\n", max_hz, spibrg / (32 * 16));
- }
- } else
- pm = spibrg / (max_hz * 2);
- if (pm)
- pm--;
- fsl->pm = pm;
-
- if (fsl->div16)
- spi_freq = spibrg / ((pm + 1) * 2 * 16);
- else
- spi_freq = spibrg / ((pm + 1) * 2);
-
- /* set tx_timeout to 10 times of one espi FIFO entry go out */
- fsl->tx_timeout = DIV_ROUND_UP((US_PER_SECOND * ESPI_FIFO_WIDTH_BIT
- * 10), spi_freq);
-
- return &fsl->slave;
-}
-
-void spi_free_slave(struct spi_slave *slave)
-{
- struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave);
- free(fsl);
-}
-
-int spi_claim_bus(struct spi_slave *slave)
+void fsl_spi_cs_activate(struct spi_slave *slave, uint cs)
{
struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave);
ccsr_espi_t *espi = fsl->espi;
- unsigned char pm = fsl->pm;
- unsigned int cs = slave->cs;
- unsigned int mode = fsl->mode;
- unsigned int div16 = fsl->div16;
- int i;
-
- debug("%s: bus:%i cs:%i\n", __func__, slave->bus, cs);
-
- /* Enable eSPI interface */
- out_be32(&espi->mode, ESPI_MODE_RXTHR(3)
- | ESPI_MODE_TXTHR(4) | ESPI_MODE_EN);
-
- out_be32(&espi->event, 0xffffffff); /* Clear all eSPI events */
- out_be32(&espi->mask, 0x00000000); /* Mask all eSPI interrupts */
-
- /* Init CS mode interface */
- for (i = 0; i < ESPI_MAX_CS_NUM; i++)
- out_be32(&espi->csmode[i], ESPI_CSMODE_INIT_VAL);
-
- out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) &
- ~(ESPI_CSMODE_PM(0xF) | ESPI_CSMODE_DIV16
- | ESPI_CSMODE_CI_INACTIVEHIGH | ESPI_CSMODE_CP_BEGIN_EDGCLK
- | ESPI_CSMODE_REV_MSB_FIRST | ESPI_CSMODE_LEN(0xF)));
-
- /* Set eSPI BRG clock source */
- out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
- | ESPI_CSMODE_PM(pm) | div16);
-
- /* Set eSPI mode */
- if (mode & SPI_CPHA)
- out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
- | ESPI_CSMODE_CP_BEGIN_EDGCLK);
- if (mode & SPI_CPOL)
- out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
- | ESPI_CSMODE_CI_INACTIVEHIGH);
-
- /* Character bit order: msb first */
- out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
- | ESPI_CSMODE_REV_MSB_FIRST);
-
- /* Character length in bits, between 0x3~0xf, i.e. 4bits~16bits */
- out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
- | ESPI_CSMODE_LEN(7));
+ unsigned int com = 0;
+ size_t data_len = fsl->data_len;
- return 0;
+ com &= ~(ESPI_COM_CS(0x3) | ESPI_COM_TRANLEN(0xFFFF));
+ com |= ESPI_COM_CS(cs);
+ com |= ESPI_COM_TRANLEN(data_len - 1);
+ out_be32(&espi->com, com);
}
-void spi_release_bus(struct spi_slave *slave)
+void fsl_spi_cs_deactivate(struct spi_slave *slave)
{
+ struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave);
+ ccsr_espi_t *espi = fsl->espi;
+ /* clear the RXCNT and TXCNT */
+ out_be32(&espi->mode, in_be32(&espi->mode) & (~ESPI_MODE_EN));
+ out_be32(&espi->mode, in_be32(&espi->mode) | ESPI_MODE_EN);
}
static void fsl_espi_tx(struct fsl_spi_slave *fsl, const void *dout)
debug("***spi_xfer:...Tx timeout! event = %08x\n", event);
}
-static int fsl_espi_rx(struct fsl_spi_slave *fsl, void *din, unsigned int bytes)
+static int fsl_espi_rx(struct fsl_spi_slave *fsl, void *din,
+ unsigned int bytes)
{
ccsr_espi_t *espi = fsl->espi;
unsigned int tmpdin, rx_times;
return bytes;
}
-int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *data_out,
- void *data_in, unsigned long flags)
+void espi_release_bus(struct fsl_spi_slave *fsl)
{
- struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave);
+ /* Disable the SPI hardware */
+ out_be32(&fsl->espi->mode,
+ in_be32(&fsl->espi->mode) & (~ESPI_MODE_EN));
+}
+
+int espi_xfer(struct fsl_spi_slave *fsl, uint cs, unsigned int bitlen,
+ const void *data_out, void *data_in, unsigned long flags)
+{
+ struct spi_slave *slave = &fsl->slave;
ccsr_espi_t *espi = fsl->espi;
unsigned int event, rx_bytes;
const void *dout = NULL;
max_tran_len = fsl->max_transfer_length;
switch (flags) {
case SPI_XFER_BEGIN:
- cmd_len = fsl->cmd_len = data_len;
+ cmd_len = data_len;
+ fsl->cmd_len = cmd_len;
memcpy(cmd_buf, data_out, cmd_len);
return 0;
case 0:
case SPI_XFER_END:
if (bitlen == 0) {
- spi_cs_deactivate(slave);
+ fsl_spi_cs_deactivate(slave);
return 0;
}
buf_len = 2 * cmd_len + min(data_len, (size_t)max_tran_len);
num_blks = DIV_ROUND_UP(tran_len + cmd_len, 4);
num_bytes = (tran_len + cmd_len) % 4;
fsl->data_len = tran_len + cmd_len;
- spi_cs_activate(slave);
+ fsl_spi_cs_activate(slave, cs);
/* Clear all eSPI events */
out_be32(&espi->event , 0xffffffff);
*(int *)buffer += tran_len;
}
}
- spi_cs_deactivate(slave);
+ fsl_spi_cs_deactivate(slave);
}
free(buffer);
return 0;
}
+void espi_claim_bus(struct fsl_spi_slave *fsl, unsigned int cs)
+{
+ ccsr_espi_t *espi = fsl->espi;
+ unsigned char pm = fsl->pm;
+ unsigned int mode = fsl->mode;
+ unsigned int div16 = fsl->div16;
+ int i;
+
+ /* Enable eSPI interface */
+ out_be32(&espi->mode, ESPI_MODE_RXTHR(3)
+ | ESPI_MODE_TXTHR(4) | ESPI_MODE_EN);
+
+ out_be32(&espi->event, 0xffffffff); /* Clear all eSPI events */
+ out_be32(&espi->mask, 0x00000000); /* Mask all eSPI interrupts */
+
+ /* Init CS mode interface */
+ for (i = 0; i < ESPI_MAX_CS_NUM; i++)
+ out_be32(&espi->csmode[i], ESPI_CSMODE_INIT_VAL);
+
+ out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) &
+ ~(ESPI_CSMODE_PM(0xF) | ESPI_CSMODE_DIV16
+ | ESPI_CSMODE_CI_INACTIVEHIGH | ESPI_CSMODE_CP_BEGIN_EDGCLK
+ | ESPI_CSMODE_REV_MSB_FIRST | ESPI_CSMODE_LEN(0xF)));
+
+ /* Set eSPI BRG clock source */
+ out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
+ | ESPI_CSMODE_PM(pm) | div16);
+
+ /* Set eSPI mode */
+ if (mode & SPI_CPHA)
+ out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
+ | ESPI_CSMODE_CP_BEGIN_EDGCLK);
+ if (mode & SPI_CPOL)
+ out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
+ | ESPI_CSMODE_CI_INACTIVEHIGH);
+
+ /* Character bit order: msb first */
+ out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
+ | ESPI_CSMODE_REV_MSB_FIRST);
+
+ /* Character length in bits, between 0x3~0xf, i.e. 4bits~16bits */
+ out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
+ | ESPI_CSMODE_LEN(7));
+}
+
+void espi_setup_slave(struct fsl_spi_slave *fsl)
+{
+ unsigned int max_hz;
+ sys_info_t sysinfo;
+ unsigned long spibrg = 0;
+ unsigned long spi_freq = 0;
+ unsigned char pm = 0;
+
+ max_hz = fsl->speed_hz;
+
+ get_sys_info(&sysinfo);
+ spibrg = sysinfo.freq_systembus / 2;
+ fsl->div16 = 0;
+ if ((spibrg / max_hz) > 32) {
+ fsl->div16 = ESPI_CSMODE_DIV16;
+ pm = spibrg / (max_hz * 16 * 2);
+ if (pm > 16) {
+ pm = 16;
+ debug("max_hz is too low: %d Hz, %ld Hz is used.\n",
+ max_hz, spibrg / (32 * 16));
+ }
+ } else {
+ pm = spibrg / (max_hz * 2);
+ }
+ if (pm)
+ pm--;
+ fsl->pm = pm;
+
+ if (fsl->div16)
+ spi_freq = spibrg / ((pm + 1) * 2 * 16);
+ else
+ spi_freq = spibrg / ((pm + 1) * 2);
+
+ /* set tx_timeout to 10 times of one espi FIFO entry go out */
+ fsl->tx_timeout = DIV_ROUND_UP((US_PER_SECOND * ESPI_FIFO_WIDTH_BIT
+ * 10), spi_freq);/* Set eSPI BRG clock source */
+}
+
+#if !CONFIG_IS_ENABLED(DM_SPI)
int spi_cs_is_valid(unsigned int bus, unsigned int cs)
{
return bus == 0 && cs < ESPI_MAX_CS_NUM;
}
-void spi_cs_activate(struct spi_slave *slave)
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
+ unsigned int max_hz, unsigned int mode)
+{
+ struct fsl_spi_slave *fsl;
+
+ if (!spi_cs_is_valid(bus, cs))
+ return NULL;
+
+ fsl = spi_alloc_slave(struct fsl_spi_slave, bus, cs);
+ if (!fsl)
+ return NULL;
+
+ fsl->espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR);
+ fsl->mode = mode;
+ fsl->max_transfer_length = ESPI_MAX_DATA_TRANSFER_LEN;
+ fsl->speed_hz = max_hz;
+
+ espi_setup_slave(fsl);
+
+ return &fsl->slave;
+}
+
+void spi_free_slave(struct spi_slave *slave)
{
struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave);
- ccsr_espi_t *espi = fsl->espi;
- unsigned int com = 0;
- size_t data_len = fsl->data_len;
- com &= ~(ESPI_COM_CS(0x3) | ESPI_COM_TRANLEN(0xFFFF));
- com |= ESPI_COM_CS(slave->cs);
- com |= ESPI_COM_TRANLEN(data_len - 1);
- out_be32(&espi->com, com);
+ free(fsl);
}
-void spi_cs_deactivate(struct spi_slave *slave)
+int spi_claim_bus(struct spi_slave *slave)
{
struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave);
- ccsr_espi_t *espi = fsl->espi;
- /* clear the RXCNT and TXCNT */
- out_be32(&espi->mode, in_be32(&espi->mode) & (~ESPI_MODE_EN));
- out_be32(&espi->mode, in_be32(&espi->mode) | ESPI_MODE_EN);
+ espi_claim_bus(fsl, slave->cs);
+
+ return 0;
}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+ struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave);
+
+ espi_release_bus(fsl);
+}
+
+int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
+ void *din, unsigned long flags)
+{
+ struct fsl_spi_slave *fsl = (struct fsl_spi_slave *)slave;
+
+ return espi_xfer(fsl, slave->cs, bitlen, dout, din, flags);
+}
+#else
+static void __espi_set_speed(struct fsl_spi_slave *fsl)
+{
+ espi_setup_slave(fsl);
+
+ /* Set eSPI BRG clock source */
+ out_be32(&fsl->espi->csmode[fsl->cs],
+ in_be32(&fsl->espi->csmode[fsl->cs])
+ | ESPI_CSMODE_PM(fsl->pm) | fsl->div16);
+}
+
+static void __espi_set_mode(struct fsl_spi_slave *fsl)
+{
+ /* Set eSPI mode */
+ if (fsl->mode & SPI_CPHA)
+ out_be32(&fsl->espi->csmode[fsl->cs],
+ in_be32(&fsl->espi->csmode[fsl->cs])
+ | ESPI_CSMODE_CP_BEGIN_EDGCLK);
+ if (fsl->mode & SPI_CPOL)
+ out_be32(&fsl->espi->csmode[fsl->cs],
+ in_be32(&fsl->espi->csmode[fsl->cs])
+ | ESPI_CSMODE_CI_INACTIVEHIGH);
+}
+
+static int fsl_espi_claim_bus(struct udevice *dev)
+{
+ struct udevice *bus = dev->parent;
+ struct fsl_spi_slave *fsl = dev_get_priv(bus);
+
+ espi_claim_bus(fsl, fsl->cs);
+
+ return 0;
+}
+
+static int fsl_espi_release_bus(struct udevice *dev)
+{
+ struct udevice *bus = dev->parent;
+ struct fsl_spi_slave *fsl = dev_get_priv(bus);
+
+ espi_release_bus(fsl);
+
+ return 0;
+}
+
+static int fsl_espi_xfer(struct udevice *dev, unsigned int bitlen,
+ const void *dout, void *din, unsigned long flags)
+{
+ struct udevice *bus = dev->parent;
+ struct fsl_spi_slave *fsl = dev_get_priv(bus);
+
+ return espi_xfer(fsl, fsl->cs, bitlen, dout, din, flags);
+}
+
+static int fsl_espi_set_speed(struct udevice *bus, uint speed)
+{
+ struct fsl_spi_slave *fsl = dev_get_priv(bus);
+
+ debug("%s speed %u\n", __func__, speed);
+ fsl->speed_hz = speed;
+
+ __espi_set_speed(fsl);
+
+ return 0;
+}
+
+static int fsl_espi_set_mode(struct udevice *bus, uint mode)
+{
+ struct fsl_spi_slave *fsl = dev_get_priv(bus);
+
+ debug("%s mode %u\n", __func__, mode);
+ fsl->mode = mode;
+
+ __espi_set_mode(fsl);
+
+ return 0;
+}
+
+static int fsl_espi_child_pre_probe(struct udevice *dev)
+{
+ struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
+ struct udevice *bus = dev->parent;
+ struct fsl_spi_slave *fsl = dev_get_priv(bus);
+
+ debug("%s cs %u\n", __func__, slave_plat->cs);
+ fsl->cs = slave_plat->cs;
+
+ return 0;
+}
+
+static int fsl_espi_probe(struct udevice *bus)
+{
+ struct fsl_espi_platdata *plat = dev_get_platdata(bus);
+ struct fsl_spi_slave *fsl = dev_get_priv(bus);
+
+ fsl->espi = (ccsr_espi_t *)((u32)plat->regs_addr);
+ fsl->max_transfer_length = ESPI_MAX_DATA_TRANSFER_LEN;
+ fsl->speed_hz = plat->speed_hz;
+
+ debug("%s probe done, bus-num %d.\n", bus->name, bus->seq);
+
+ return 0;
+}
+
+static const struct dm_spi_ops fsl_espi_ops = {
+ .claim_bus = fsl_espi_claim_bus,
+ .release_bus = fsl_espi_release_bus,
+ .xfer = fsl_espi_xfer,
+ .set_speed = fsl_espi_set_speed,
+ .set_mode = fsl_espi_set_mode,
+};
+
+#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
+static int fsl_espi_ofdata_to_platdata(struct udevice *bus)
+{
+ fdt_addr_t addr;
+ struct fsl_espi_platdata *plat = bus->platdata;
+ const void *blob = gd->fdt_blob;
+ int node = dev_of_offset(bus);
+
+ addr = dev_read_addr(bus);
+ if (addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ plat->regs_addr = lower_32_bits(addr);
+ plat->speed_hz = fdtdec_get_int(blob, node, "spi-max-frequency",
+ FSL_ESPI_DEFAULT_SCK_FREQ);
+
+ debug("ESPI: regs=%p, max-frequency=%d\n",
+ &plat->regs_addr, plat->speed_hz);
+
+ return 0;
+}
+
+static const struct udevice_id fsl_espi_ids[] = {
+ { .compatible = "fsl,mpc8536-espi" },
+ { }
+};
+#endif
+
+U_BOOT_DRIVER(fsl_espi) = {
+ .name = "fsl_espi",
+ .id = UCLASS_SPI,
+#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
+ .of_match = fsl_espi_ids,
+ .ofdata_to_platdata = fsl_espi_ofdata_to_platdata,
+#endif
+ .ops = &fsl_espi_ops,
+ .platdata_auto_alloc_size = sizeof(struct fsl_espi_platdata),
+ .priv_auto_alloc_size = sizeof(struct fsl_spi_slave),
+ .probe = fsl_espi_probe,
+ .child_pre_probe = fsl_espi_child_pre_probe,
+};
+#endif
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