Add eSPI controller support under the SPI framework.
Signed-off-by: Mingkai Hu Mingkai.hu@freescale.com --- drivers/mtd/spi/spi_flash.c | 94 +++++++++++++++++- drivers/spi/Makefile | 1 + drivers/spi/fsl_espi.c | 232 +++++++++++++++++++++++++++++++++++++++++++ include/spi.h | 30 ++++++ 4 files changed, 354 insertions(+), 3 deletions(-) create mode 100644 drivers/spi/fsl_espi.c
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c index d1d81af..fa97896 100644 --- a/drivers/mtd/spi/spi_flash.c +++ b/drivers/mtd/spi/spi_flash.c @@ -1,6 +1,8 @@ /* * SPI flash interface + * Add support for Freescale eSPI controller * + * Copyright (C) 2009 Freescale Semiconductor, Inc. * Copyright (C) 2008 Atmel Corporation */ #define DEBUG @@ -16,6 +18,7 @@ int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len) unsigned long flags = SPI_XFER_BEGIN; int ret;
+#ifndef CONFIG_FSL_ESPI if (len == 0) flags |= SPI_XFER_END;
@@ -31,6 +34,35 @@ int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len) debug("SF: Failed to read response (%zu bytes): %d\n", len, ret); } +#else + struct espi_transfer transfer[1]; + unsigned char *buffer; + + buffer = (unsigned char *)malloc(len + 2); + if (!buffer) { + debug("SF: Failed to malloc memory.\n"); + return 1; + } + memcpy(buffer, &cmd, 1); + + transfer[0].cmd_len = 1; + transfer[0].data_len = len; + transfer[0].tx_buf = buffer; + transfer[0].rx_buf = buffer + 1; + transfer[0].flags = flags | SPI_XFER_END; + + spi->transfer = &transfer[0]; + ret = espi_xfer(spi); + if (ret) { + debug("SF: Failed to send command %02x: %d\n", cmd, ret); + return ret; + } + + if (len) + memcpy(response, transfer[0].rx_buf + 1, len); + + free(buffer); +#endif
return ret; } @@ -41,6 +73,7 @@ int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd, unsigned long flags = SPI_XFER_BEGIN; int ret;
+#ifndef CONFIG_FSL_ESPI if (data_len == 0) flags |= SPI_XFER_END;
@@ -54,6 +87,33 @@ int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd, debug("SF: Failed to read %zu bytes of data: %d\n", data_len, ret); } +#else + struct espi_transfer transfer[1]; + unsigned char *buffer; + + buffer = (unsigned char *)malloc(2 * cmd_len + data_len); + if (!buffer) { + debug("SF: Failed to malloc memory.\n"); + return 1; + } + memcpy(buffer, cmd, cmd_len); + + transfer[0].cmd_len = cmd_len; + transfer[0].data_len = data_len; + transfer[0].tx_buf = buffer; + transfer[0].rx_buf = buffer + cmd_len; + transfer[0].flags = flags | SPI_XFER_END; + + spi->transfer = &transfer[0]; + ret = espi_xfer(spi); + if (ret) { + debug("SF: Failed to read %zu bytes of data: %d\n", + data_len, ret); + } + + memcpy(data, transfer[0].rx_buf + cmd_len, data_len); + free(buffer); +#endif
return ret; } @@ -64,6 +124,7 @@ int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len, unsigned long flags = SPI_XFER_BEGIN; int ret;
+#ifndef CONFIG_FSL_ESPI if (data_len == 0) flags |= SPI_XFER_END;
@@ -77,6 +138,33 @@ int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len, debug("SF: Failed to read %zu bytes of data: %d\n", data_len, ret); } +#else + struct espi_transfer transfer[1]; + unsigned char *buffer; + + buffer = (unsigned char *)malloc(cmd_len + data_len); + if (!buffer) { + debug("SF: Failed to malloc memory.\n"); + return 1; + } + memcpy(buffer, cmd, cmd_len); + memcpy(buffer + cmd_len, data, data_len); + + transfer[0].cmd_len = cmd_len; + transfer[0].data_len = data_len; + transfer[0].tx_buf = buffer; + transfer[0].rx_buf = NULL; + transfer[0].flags = flags | SPI_XFER_END; + + spi->transfer = &transfer[0]; + ret = espi_xfer(spi); + if (ret) { + debug("SF: Failed to read %zu bytes of data: %d\n", + data_len, ret); + } + + free(buffer); +#endif
return ret; } @@ -101,7 +189,7 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs, struct spi_slave *spi; struct spi_flash *flash; int ret; - u8 idcode[3]; + u8 idcode[5];
spi = spi_setup_slave(bus, cs, max_hz, spi_mode); if (!spi) { @@ -120,8 +208,8 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs, if (ret) goto err_read_id;
- debug("SF: Got idcode %02x %02x %02x\n", idcode[0], - idcode[1], idcode[2]); + debug("SF: Got idcode %02x %02x %02x %02x %02x\n", idcode[0], + idcode[1], idcode[2], idcode[3], idcode[4]);
switch (idcode[0]) { #ifdef CONFIG_SPI_FLASH_SPANSION diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 6e2c121..406881a 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -30,6 +30,7 @@ COBJS-$(CONFIG_BFIN_SPI) += bfin_spi.o COBJS-$(CONFIG_MPC8XXX_SPI) += mpc8xxx_spi.o COBJS-$(CONFIG_MXC_SPI) += mxc_spi.o COBJS-$(CONFIG_SOFT_SPI) += soft_spi.o +COBJS-$(CONFIG_FSL_ESPI) += fsl_espi.o
COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/spi/fsl_espi.c b/drivers/spi/fsl_espi.c new file mode 100644 index 0000000..78d7b25 --- /dev/null +++ b/drivers/spi/fsl_espi.c @@ -0,0 +1,232 @@ +/* + * eSPI controller driver. + * + * Copyright (C) 2009 Freescale Semiconductor, Inc. All rights reserved. + * Author: Mingkai Hu (Mingkai.hu@freescale.com) + * + * 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. + * + * 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 <spi.h> +#include <asm/immap_85xx.h> + +#define ESPI_MAX_CS_NUM 4 + +#define ESPI_EV_RNE (1 << 9) +#define ESPI_EV_TNF (1 << 8) + +#define ESPI_MODE_EN (1 << 31) /* Enable interface */ +#define ESPI_MODE_TXTHR(x) ((x) << 8) /* Tx FIFO threshold */ +#define ESPI_MODE_RXTHR(x) ((x) << 0) /* Rx FIFO threshold */ + +#define ESPI_COM_CS(x) ((x) << 30) +#define ESPI_COM_TRANLEN(x) ((x) << 0) + +#define ESPI_CSMODE_CI_INACTIVEHIGH (1 << 31) +#define ESPI_CSMODE_CP_BEGIN_EDGCLK (1 << 30) +#define ESPI_CSMODE_REV_MSB_FIRST (1 << 29) +#define ESPI_CSMODE_DIV16 (1 << 28) +#define ESPI_CSMODE_PM(x) ((x) << 24) +#define ESPI_CSMODE_POL_ASSERTED_LOW (1 << 20) +#define ESPI_CSMODE_LEN(x) ((x) << 16) +#define ESPI_CSMODE_CSBEF(x) ((x) << 12) +#define ESPI_CSMODE_CSAFT(x) ((x) << 8) +#define ESPI_CSMODE_CSCG(x) ((x) << 3) + +#define ESPI_CSMODE_INIT_VAL (ESPI_CSMODE_POL_ASSERTED_LOW | \ + ESPI_CSMODE_CSBEF(0) | ESPI_CSMODE_CSAFT(0) | \ + ESPI_CSMODE_CSCG(1)) + +struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, + unsigned int max_hz, unsigned int mode) +{ + volatile ccsr_espi_t *espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR); + struct spi_slave *slave; + sys_info_t sysinfo; + unsigned long spibrg = 0; + unsigned char pm = 0; + int i; + + if (!spi_cs_is_valid(bus, cs)) + return NULL; + + slave = malloc(sizeof(struct spi_slave)); + if (!slave) + return NULL; + + slave->bus = bus; + slave->cs = cs; + + /* Enable eSPI interface */ + espi->mode = ESPI_MODE_RXTHR(3) | ESPI_MODE_TXTHR(4) | ESPI_MODE_EN; + + espi->event = 0xffffffff; /* Clear all eSPI events */ + espi->mask = 0x00000000; /* Mask all eSPI interrupts */ + + /* Init CS mode interface */ + for (i = 0; i < ESPI_MAX_CS_NUM; i++) + espi->csmode[i] = ESPI_CSMODE_INIT_VAL; + + 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 */ + get_sys_info(&sysinfo); + spibrg = sysinfo.freqSystemBus / 2; + if ((spibrg / max_hz) > 32) { + espi->csmode[cs] |= ESPI_CSMODE_DIV16; + pm = spibrg / (max_hz * 16 * 2); + if (pm > 16) { + pm = 16; + debug("Requested speed is too low: %d Hz" + " %d Hz is used.\n", max_hz, spibrg / (32 * 16)); + } + } else + pm = spibrg / (max_hz * 2); + if (pm) + pm--; + espi->csmode[cs] |= ESPI_CSMODE_PM(pm); + + /* Set eSPI mode */ + if (mode & SPI_CPHA) + espi->csmode[cs] |= ESPI_CSMODE_CP_BEGIN_EDGCLK; + if (mode & SPI_CPOL) + espi->csmode[cs] |= ESPI_CSMODE_CI_INACTIVEHIGH; + + /* Character bit order: msb first */ + espi->csmode[cs] |= ESPI_CSMODE_REV_MSB_FIRST; + + /* Character length in bits, between 0x3~0xf, i.e. 4bits~16bits */ + espi->csmode[cs] |= ESPI_CSMODE_LEN(7); + + return slave; +} + +void spi_free_slave(struct spi_slave *slave) +{ + free(slave); +} + +void spi_init(void) +{ + +} + +int spi_claim_bus(struct spi_slave *slave) +{ + return 0; +} + +void spi_release_bus(struct spi_slave *slave) +{ + +} + +int espi_xfer(struct spi_slave *slave) +{ + volatile ccsr_espi_t *espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR); + unsigned int tmpdout, tmpdin, event; + struct espi_transfer *t = slave->transfer; + unsigned int len = t->cmd_len + t->data_len; + const void *dout = t->tx_buf; + void *din = t->rx_buf; + unsigned long flags = t->flags; + int numBlks = len / 4 + (len % 4 ? 1 : 0); + unsigned char charsize = 4; + + debug("spi_xfer: slave %u:%u dout %08X(%08x) din %08X(%08x) len %u\n", + slave->bus, slave->cs, *(uint *) dout, dout, *(uint *) din, din, len); + + if (flags & SPI_XFER_BEGIN) + spi_cs_activate(slave); + + /* Clear all eSPI events */ + espi->event = 0xffffffff; + + /* handle data in 32-bit chunks */ + while (numBlks--) { + charsize = (len >= 4 ? 4 : len); + + event = espi->event; + if (event & ESPI_EV_TNF) { + tmpdout = *(u32 *)dout; + + /* Set up the next iteration if sending > 4 bytes */ + if (len > 4) { + len -= 4; + dout += 4; + } + + espi->tx = tmpdout; + espi->event |= ESPI_EV_TNF; + } + debug("*** espi_xfer: ... %08x written\n", tmpdout); + + /* Wait for eSPI transmit to get out */ + udelay(80); + + event = espi->event; + if (event & ESPI_EV_RNE) { + tmpdin = espi->rx; + *(u32 *) din = tmpdin; + + if (charsize == 4) { + din += 4; + } + + espi->event |= ESPI_EV_RNE; + } + debug("*** espi_xfer: ... %08x readed\n", tmpdin); + } + + if (flags & SPI_XFER_END) + spi_cs_deactivate(slave); + + return 0; +} + +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) +{ + volatile ccsr_espi_t *espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR); + struct espi_transfer *t = slave->transfer; + unsigned int com = 0; + unsigned int len = t->cmd_len + t->data_len; + + com &= ~(ESPI_COM_CS(0x3) | ESPI_COM_TRANLEN(0xFFFF)); + com |= ESPI_COM_CS(slave->cs); + com |= ESPI_COM_TRANLEN(len - 1); + espi->com = com; + + return; +} + +void spi_cs_deactivate(struct spi_slave *slave) +{ + volatile ccsr_espi_t *espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR); + + /* clear the RXCNT and TXCNT */ + espi->mode &= ~ESPI_MODE_EN; + espi->mode |= ESPI_MODE_EN; +} diff --git a/include/spi.h b/include/spi.h index 320e50e..948a565 100644 --- a/include/spi.h +++ b/include/spi.h @@ -50,16 +50,38 @@ #define SPI_XFER_END 0x02 /* Deassert CS after transfer */
/*----------------------------------------------------------------------- + * Representation of a eSPI transaction, which is always embeded in + * structure spi_slave. + * + * cmd_len: Length of the command. + * data_len: Length of the transmit/receive data. + * tx_buf: Buffer to store the transmit command and data. + * rx_buf: Buffer to store the receive data. + * flags: Flags to indicate the begin/end of the transfer. + */ +struct espi_transfer { + unsigned int cmd_len; + unsigned int data_len; + const void *tx_buf; + void *rx_buf; + + unsigned long flags; +}; + +/*----------------------------------------------------------------------- * Representation of a SPI slave, i.e. what we're communicating with. * * Drivers are expected to extend this with controller-specific data. * * bus: ID of the bus that the slave is attached to. * cs: ID of the chip select connected to the slave. + * transfer: Represent an eSPI transaction. */ struct spi_slave { unsigned int bus; unsigned int cs; + + struct espi_transfer *transfer; };
/*----------------------------------------------------------------------- @@ -148,6 +170,14 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, void *din, unsigned long flags);
/*----------------------------------------------------------------------- + * eSPI transfer + * + * Returns: 0 on success, not 0 on failure + */ +int espi_xfer(struct spi_slave *slave); + + +/*----------------------------------------------------------------------- * Determine if a SPI chipselect is valid. * This function is provided by the board if the low-level SPI driver * needs it to determine if a given chipselect is actually valid.