Signed-off-by: Mingkai Hu <Mingkai.hu@freescale.com> Singed-off-by: Jerry Huang <Chang-Ming.Huang@freescale.com> Signed-off-by: Shaohui Xie <b21989@freescale.com> Cc: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>master
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/*
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* eSPI controller driver. |
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* |
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* Copyright 2010-2011 Freescale Semiconductor, Inc. |
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* Author: Mingkai Hu (Mingkai.hu@freescale.com) |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
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* MA 02111-1307 USA |
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*/ |
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#include <common.h> |
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#include <malloc.h> |
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#include <spi.h> |
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#include <asm/immap_85xx.h> |
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struct fsl_spi_slave { |
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struct spi_slave slave; |
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unsigned int div16; |
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unsigned int pm; |
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unsigned int mode; |
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size_t cmd_len; |
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u8 cmd_buf[16]; |
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size_t data_len; |
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unsigned int max_transfer_length; |
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}; |
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#define to_fsl_spi_slave(s) container_of(s, struct fsl_spi_slave, slave) |
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#define ESPI_MAX_CS_NUM 4 |
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#define ESPI_EV_RNE (1 << 9) |
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#define ESPI_EV_TNF (1 << 8) |
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#define ESPI_MODE_EN (1 << 31) /* Enable interface */ |
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#define ESPI_MODE_TXTHR(x) ((x) << 8) /* Tx FIFO threshold */ |
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#define ESPI_MODE_RXTHR(x) ((x) << 0) /* Rx FIFO threshold */ |
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#define ESPI_COM_CS(x) ((x) << 30) |
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#define ESPI_COM_TRANLEN(x) ((x) << 0) |
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#define ESPI_CSMODE_CI_INACTIVEHIGH (1 << 31) |
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#define ESPI_CSMODE_CP_BEGIN_EDGCLK (1 << 30) |
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#define ESPI_CSMODE_REV_MSB_FIRST (1 << 29) |
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#define ESPI_CSMODE_DIV16 (1 << 28) |
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#define ESPI_CSMODE_PM(x) ((x) << 24) |
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#define ESPI_CSMODE_POL_ASSERTED_LOW (1 << 20) |
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#define ESPI_CSMODE_LEN(x) ((x) << 16) |
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#define ESPI_CSMODE_CSBEF(x) ((x) << 12) |
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#define ESPI_CSMODE_CSAFT(x) ((x) << 8) |
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#define ESPI_CSMODE_CSCG(x) ((x) << 3) |
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#define ESPI_CSMODE_INIT_VAL (ESPI_CSMODE_POL_ASSERTED_LOW | \ |
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ESPI_CSMODE_CSBEF(0) | ESPI_CSMODE_CSAFT(0) | \
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ESPI_CSMODE_CSCG(1)) |
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#define ESPI_MAX_DATA_TRANSFER_LEN 0xFFF0 |
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struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, |
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unsigned int max_hz, unsigned int mode) |
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{ |
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struct fsl_spi_slave *fsl; |
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sys_info_t sysinfo; |
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unsigned long spibrg = 0; |
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unsigned char pm = 0; |
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if (!spi_cs_is_valid(bus, cs)) |
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return NULL; |
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fsl = malloc(sizeof(struct fsl_spi_slave)); |
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if (!fsl) |
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return NULL; |
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fsl->slave.bus = bus; |
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fsl->slave.cs = cs; |
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fsl->mode = mode; |
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fsl->max_transfer_length = ESPI_MAX_DATA_TRANSFER_LEN; |
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/* Set eSPI BRG clock source */ |
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get_sys_info(&sysinfo); |
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spibrg = sysinfo.freqSystemBus / 2; |
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fsl->div16 = 0; |
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if ((spibrg / max_hz) > 32) { |
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fsl->div16 = ESPI_CSMODE_DIV16; |
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pm = spibrg / (max_hz * 16 * 2); |
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if (pm > 16) { |
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pm = 16; |
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debug("Requested speed is too low: %d Hz, " |
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"%d Hz is used.\n", max_hz, spibrg / (32 * 16)); |
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} |
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} else |
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pm = spibrg / (max_hz * 2); |
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if (pm) |
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pm--; |
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fsl->pm = pm; |
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return &fsl->slave; |
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} |
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void spi_free_slave(struct spi_slave *slave) |
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{ |
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struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave); |
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free(fsl); |
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} |
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void spi_init(void) |
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{ |
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} |
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int spi_claim_bus(struct spi_slave *slave) |
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{ |
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struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave); |
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ccsr_espi_t *espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR); |
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unsigned char pm = fsl->pm; |
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unsigned int cs = slave->cs; |
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unsigned int mode = fsl->mode; |
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unsigned int div16 = fsl->div16; |
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int i; |
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debug("%s: bus:%i cs:%i\n", __func__, slave->bus, cs); |
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/* Enable eSPI interface */ |
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out_be32(&espi->mode, ESPI_MODE_RXTHR(3) |
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| ESPI_MODE_TXTHR(4) | ESPI_MODE_EN); |
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out_be32(&espi->event, 0xffffffff); /* Clear all eSPI events */ |
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out_be32(&espi->mask, 0x00000000); /* Mask all eSPI interrupts */ |
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/* Init CS mode interface */ |
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for (i = 0; i < ESPI_MAX_CS_NUM; i++) |
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out_be32(&espi->csmode[i], ESPI_CSMODE_INIT_VAL); |
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out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) & |
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~(ESPI_CSMODE_PM(0xF) | ESPI_CSMODE_DIV16 |
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| ESPI_CSMODE_CI_INACTIVEHIGH | ESPI_CSMODE_CP_BEGIN_EDGCLK |
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| ESPI_CSMODE_REV_MSB_FIRST | ESPI_CSMODE_LEN(0xF))); |
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/* Set eSPI BRG clock source */ |
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out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) |
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| ESPI_CSMODE_PM(pm) | div16); |
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/* Set eSPI mode */ |
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if (mode & SPI_CPHA) |
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out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) |
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| ESPI_CSMODE_CP_BEGIN_EDGCLK); |
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if (mode & SPI_CPOL) |
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out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) |
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| ESPI_CSMODE_CI_INACTIVEHIGH); |
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/* Character bit order: msb first */ |
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out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) |
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| ESPI_CSMODE_REV_MSB_FIRST); |
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/* Character length in bits, between 0x3~0xf, i.e. 4bits~16bits */ |
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out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) |
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| ESPI_CSMODE_LEN(7)); |
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return 0; |
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} |
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void spi_release_bus(struct spi_slave *slave) |
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{ |
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} |
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int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *data_out, |
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void *data_in, unsigned long flags) |
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{ |
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struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave); |
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ccsr_espi_t *espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR); |
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unsigned int tmpdout, tmpdin, event; |
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const void *dout = NULL; |
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void *din = NULL; |
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int len = 0; |
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int num_blks, num_chunks, max_tran_len, tran_len; |
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int num_bytes; |
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unsigned char *ch; |
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unsigned char *buffer = NULL; |
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size_t buf_len; |
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u8 *cmd_buf = fsl->cmd_buf; |
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size_t cmd_len = fsl->cmd_len; |
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size_t data_len = bitlen / 8; |
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size_t rx_offset = 0; |
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max_tran_len = fsl->max_transfer_length; |
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switch (flags) { |
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case SPI_XFER_BEGIN: |
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cmd_len = fsl->cmd_len = data_len; |
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memcpy(cmd_buf, data_out, cmd_len); |
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return 0; |
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case 0: |
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case SPI_XFER_END: |
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if (bitlen == 0) { |
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spi_cs_deactivate(slave); |
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return 0; |
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} |
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buf_len = 2 * cmd_len + min(data_len, max_tran_len); |
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len = cmd_len + data_len; |
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rx_offset = cmd_len; |
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buffer = (unsigned char *)malloc(buf_len); |
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if (!buffer) { |
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debug("SF: Failed to malloc memory.\n"); |
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return 1; |
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} |
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memcpy(buffer, cmd_buf, cmd_len); |
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if (cmd_len != 1) { |
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if (data_in == NULL) |
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memcpy(buffer + cmd_len, data_out, data_len); |
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} |
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break; |
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case SPI_XFER_BEGIN | SPI_XFER_END: |
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len = data_len; |
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buffer = (unsigned char *)malloc(len * 2); |
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if (!buffer) { |
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debug("SF: Failed to malloc memory.\n"); |
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return 1; |
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} |
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memcpy(buffer, data_out, len); |
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rx_offset = len; |
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cmd_len = 0; |
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break; |
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} |
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debug("spi_xfer: slave %u:%u dout %08X(%08x) din %08X(%08x) len %u\n", |
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slave->bus, slave->cs, *(uint *) dout, |
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dout, *(uint *) din, din, len); |
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num_chunks = data_len / max_tran_len + |
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(data_len % max_tran_len ? 1 : 0); |
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while (num_chunks--) { |
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if (data_in) |
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din = buffer + rx_offset; |
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dout = buffer; |
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tran_len = min(data_len , max_tran_len); |
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num_blks = (tran_len + cmd_len) / 4 + |
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((tran_len + cmd_len) % 4 ? 1 : 0); |
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num_bytes = (tran_len + cmd_len) % 4; |
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fsl->data_len = tran_len + cmd_len; |
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spi_cs_activate(slave); |
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/* Clear all eSPI events */ |
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out_be32(&espi->event , 0xffffffff); |
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/* handle data in 32-bit chunks */ |
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while (num_blks--) { |
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event = in_be32(&espi->event); |
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if (event & ESPI_EV_TNF) { |
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tmpdout = *(u32 *)dout; |
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/* Set up the next iteration */ |
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if (len > 4) { |
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len -= 4; |
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dout += 4; |
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} |
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out_be32(&espi->tx, tmpdout); |
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out_be32(&espi->event, ESPI_EV_TNF); |
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debug("***spi_xfer:...%08x written\n", tmpdout); |
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} |
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/* Wait for eSPI transmit to get out */ |
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udelay(80); |
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event = in_be32(&espi->event); |
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if (event & ESPI_EV_RNE) { |
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tmpdin = in_be32(&espi->rx); |
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if (num_blks == 0 && num_bytes != 0) { |
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ch = (unsigned char *)&tmpdin; |
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while (num_bytes--) |
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*(unsigned char *)din++ = *ch++; |
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} else { |
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*(u32 *) din = tmpdin; |
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din += 4; |
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} |
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out_be32(&espi->event, in_be32(&espi->event) |
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| ESPI_EV_RNE); |
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debug("***spi_xfer:...%08x readed\n", tmpdin); |
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} |
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} |
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if (data_in) { |
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memcpy(data_in, buffer + 2 * cmd_len, tran_len); |
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if (*buffer == 0x0b) { |
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data_in += tran_len; |
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data_len -= tran_len; |
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*(int *)buffer += tran_len; |
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} |
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} |
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spi_cs_deactivate(slave); |
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} |
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free(buffer); |
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return 0; |
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} |
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int spi_cs_is_valid(unsigned int bus, unsigned int cs) |
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{ |
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return bus == 0 && cs < ESPI_MAX_CS_NUM; |
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} |
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void spi_cs_activate(struct spi_slave *slave) |
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{ |
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struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave); |
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ccsr_espi_t *espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR); |
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unsigned int com = 0; |
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size_t data_len = fsl->data_len; |
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com &= ~(ESPI_COM_CS(0x3) | ESPI_COM_TRANLEN(0xFFFF)); |
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com |= ESPI_COM_CS(slave->cs); |
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com |= ESPI_COM_TRANLEN(data_len - 1); |
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out_be32(&espi->com, com); |
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} |
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void spi_cs_deactivate(struct spi_slave *slave) |
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{ |
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ccsr_espi_t *espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR); |
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/* clear the RXCNT and TXCNT */ |
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out_be32(&espi->mode, in_be32(&espi->mode) & (~ESPI_MODE_EN)); |
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out_be32(&espi->mode, in_be32(&espi->mode) | ESPI_MODE_EN); |
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} |
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