X-Git-Url: https://git.kernelconcepts.de/?a=blobdiff_plain;f=drivers%2Fspi%2Fomap3_spi.c;h=651e46e4bd20b345b83dcd9a87d89a5196c583bf;hb=08798026f24bd7c706e70372f8c323f0702c9a15;hp=80a4e4776c83d17314b54060e758d980d91975b8;hpb=fed029f3c31b7d5df674b5090a13356b631918c7;p=karo-tx-uboot.git diff --git a/drivers/spi/omap3_spi.c b/drivers/spi/omap3_spi.c index 80a4e4776c..651e46e4bd 100644 --- a/drivers/spi/omap3_spi.c +++ b/drivers/spi/omap3_spi.c @@ -11,24 +11,7 @@ * * Modified by Ruslan Araslanov * - * See file CREDITS for list of people who contributed to this - * project. - * - * 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 - * + * SPDX-License-Identifier: GPL-2.0+ */ #include @@ -37,8 +20,7 @@ #include #include "omap3_spi.h" -#define WORD_LEN 8 -#define SPI_WAIT_TIMEOUT 3000000; +#define SPI_WAIT_TIMEOUT 3000000 static void spi_reset(struct omap3_spi_slave *ds) { @@ -67,7 +49,7 @@ static void omap3_spi_write_chconf(struct omap3_spi_slave *ds, int val) static void omap3_spi_set_enable(struct omap3_spi_slave *ds, int enable) { writel(enable, &ds->regs->channel[ds->slave.cs].chctrl); - /* Flash post writes to make immediate effect */ + /* Flash post writes to make immediate effect */ readl(&ds->regs->channel[ds->slave.cs].chctrl); } @@ -100,7 +82,7 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, regs = (struct mcspi *)OMAP3_MCSPI2_BASE; break; #endif -#ifdef OMAP3_MCSPI3_BASE +#ifdef OMAP3_MCSPI3_BASE case 2: regs = (struct mcspi *)OMAP3_MCSPI3_BASE; break; @@ -202,7 +184,7 @@ int spi_claim_bus(struct spi_slave *slave) /* wordlength */ conf &= ~OMAP3_MCSPI_CHCONF_WL_MASK; - conf |= (WORD_LEN - 1) << 7; + conf |= (ds->slave.wordlen - 1) << 7; /* set chipselect polarity; manage with FORCE */ if (!(ds->mode & SPI_CS_HIGH)) @@ -240,7 +222,7 @@ void spi_release_bus(struct spi_slave *slave) spi_reset(ds); } -int omap3_spi_write(struct spi_slave *slave, unsigned int len, const u8 *txp, +int omap3_spi_write(struct spi_slave *slave, unsigned int len, const void *txp, unsigned long flags) { struct omap3_spi_slave *ds = to_omap3_spi(slave); @@ -251,7 +233,8 @@ int omap3_spi_write(struct spi_slave *slave, unsigned int len, const u8 *txp, /* Enable the channel */ omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_EN); - chconf &= ~OMAP3_MCSPI_CHCONF_TRM_MASK; + chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK); + chconf |= (ds->slave.wordlen - 1) << 7; chconf |= OMAP3_MCSPI_CHCONF_TRM_TX_ONLY; chconf |= OMAP3_MCSPI_CHCONF_FORCE; omap3_spi_write_chconf(ds,chconf); @@ -267,12 +250,19 @@ int omap3_spi_write(struct spi_slave *slave, unsigned int len, const u8 *txp, } } /* Write the data */ - writel(txp[i], &ds->regs->channel[ds->slave.cs].tx); + unsigned int *tx = &ds->regs->channel[ds->slave.cs].tx; + if (ds->slave.wordlen > 16) + writel(((u32 *)txp)[i], tx); + else if (ds->slave.wordlen > 8) + writel(((u16 *)txp)[i], tx); + else + writel(((u8 *)txp)[i], tx); } - /* wait to finish of transfer */ - while (!(readl(&ds->regs->channel[ds->slave.cs].chstat) & - OMAP3_MCSPI_CHSTAT_EOT)); + /* wait to finish of transfer */ + while ((readl(&ds->regs->channel[ds->slave.cs].chstat) & + (OMAP3_MCSPI_CHSTAT_EOT | OMAP3_MCSPI_CHSTAT_TXS)) != + (OMAP3_MCSPI_CHSTAT_EOT | OMAP3_MCSPI_CHSTAT_TXS)); /* Disable the channel otherwise the next immediate RX will get affected */ omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_DIS); @@ -285,7 +275,7 @@ int omap3_spi_write(struct spi_slave *slave, unsigned int len, const u8 *txp, return 0; } -int omap3_spi_read(struct spi_slave *slave, unsigned int len, u8 *rxp, +int omap3_spi_read(struct spi_slave *slave, unsigned int len, void *rxp, unsigned long flags) { struct omap3_spi_slave *ds = to_omap3_spi(slave); @@ -296,7 +286,8 @@ int omap3_spi_read(struct spi_slave *slave, unsigned int len, u8 *rxp, /* Enable the channel */ omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_EN); - chconf &= ~OMAP3_MCSPI_CHCONF_TRM_MASK; + chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK); + chconf |= (ds->slave.wordlen - 1) << 7; chconf |= OMAP3_MCSPI_CHCONF_TRM_RX_ONLY; chconf |= OMAP3_MCSPI_CHCONF_FORCE; omap3_spi_write_chconf(ds,chconf); @@ -319,7 +310,13 @@ int omap3_spi_read(struct spi_slave *slave, unsigned int len, u8 *rxp, omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_DIS); /* Read the data */ - rxp[i] = readl(&ds->regs->channel[ds->slave.cs].rx); + unsigned int *rx = &ds->regs->channel[ds->slave.cs].rx; + if (ds->slave.wordlen > 16) + ((u32 *)rxp)[i] = readl(rx); + else if (ds->slave.wordlen > 8) + ((u16 *)rxp)[i] = (u16)readl(rx); + else + ((u8 *)rxp)[i] = (u8)readl(rx); } if (flags & SPI_XFER_END) { @@ -331,8 +328,8 @@ int omap3_spi_read(struct spi_slave *slave, unsigned int len, u8 *rxp, } /*McSPI Transmit Receive Mode*/ -int omap3_spi_txrx(struct spi_slave *slave, - unsigned int len, const u8 *txp, u8 *rxp, unsigned long flags) +int omap3_spi_txrx(struct spi_slave *slave, unsigned int len, + const void *txp, void *rxp, unsigned long flags) { struct omap3_spi_slave *ds = to_omap3_spi(slave); int timeout = SPI_WAIT_TIMEOUT; @@ -344,7 +341,8 @@ int omap3_spi_txrx(struct spi_slave *slave, omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_EN); /*set TRANSMIT-RECEIVE Mode*/ - chconf &= ~OMAP3_MCSPI_CHCONF_TRM_MASK; + chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK); + chconf |= (ds->slave.wordlen - 1) << 7; chconf |= OMAP3_MCSPI_CHCONF_FORCE; omap3_spi_write_chconf(ds,chconf); @@ -361,7 +359,13 @@ int omap3_spi_txrx(struct spi_slave *slave, } } /* Write the data */ - writel(txp[i], &ds->regs->channel[ds->slave.cs].tx); + unsigned int *tx = &ds->regs->channel[ds->slave.cs].tx; + if (ds->slave.wordlen > 16) + writel(((u32 *)txp)[i], tx); + else if (ds->slave.wordlen > 8) + writel(((u16 *)txp)[i], tx); + else + writel(((u8 *)txp)[i], tx); /*Read: wait for RX containing data (RXS == 1)*/ while (!(readl(&ds->regs->channel[ds->slave.cs].chstat) & @@ -373,10 +377,16 @@ int omap3_spi_txrx(struct spi_slave *slave, } } /* Read the data */ - rxp[i] = readl(&ds->regs->channel[ds->slave.cs].rx); + unsigned int *rx = &ds->regs->channel[ds->slave.cs].rx; + if (ds->slave.wordlen > 16) + ((u32 *)rxp)[i] = readl(rx); + else if (ds->slave.wordlen > 8) + ((u16 *)rxp)[i] = (u16)readl(rx); + else + ((u8 *)rxp)[i] = (u8)readl(rx); } /* Disable the channel */ - omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_DIS); + omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_DIS); /*if transfer must be terminated disable the channel*/ if (flags & SPI_XFER_END) { @@ -392,14 +402,17 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, { struct omap3_spi_slave *ds = to_omap3_spi(slave); unsigned int len; - const u8 *txp = dout; - u8 *rxp = din; int ret = -1; - if (bitlen % 8) + if (ds->slave.wordlen < 4 || ds->slave.wordlen > 32) { + printf("omap3_spi: invalid wordlen %d\n", ds->slave.wordlen); + return -1; + } + + if (bitlen % ds->slave.wordlen) return -1; - len = bitlen / 8; + len = bitlen / ds->slave.wordlen; if (bitlen == 0) { /* only change CS */ int chconf = readl(&ds->regs->channel[ds->slave.cs].chconf); @@ -417,11 +430,11 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, ret = 0; } else { if (dout != NULL && din != NULL) - ret = omap3_spi_txrx(slave, len, txp, rxp, flags); + ret = omap3_spi_txrx(slave, len, dout, din, flags); else if (dout != NULL) - ret = omap3_spi_write(slave, len, txp, flags); + ret = omap3_spi_write(slave, len, dout, flags); else if (din != NULL) - ret = omap3_spi_read(slave, len, rxp, flags); + ret = omap3_spi_read(slave, len, din, flags); } return ret; }