diff options
Diffstat (limited to 'u-boot/drivers/spi/cf_spi.c')
| -rw-r--r-- | u-boot/drivers/spi/cf_spi.c | 357 |
1 files changed, 357 insertions, 0 deletions
diff --git a/u-boot/drivers/spi/cf_spi.c b/u-boot/drivers/spi/cf_spi.c new file mode 100644 index 0000000..722aafc --- /dev/null +++ b/u-boot/drivers/spi/cf_spi.c @@ -0,0 +1,357 @@ +/* + * + * (C) Copyright 2000-2003 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * Copyright (C) 2004-2009 Freescale Semiconductor, Inc. + * TsiChung Liew (Tsi-Chung.Liew@freescale.com) + * + * 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 + */ + +#include <common.h> +#include <spi.h> +#include <malloc.h> +#include <asm/immap.h> + +struct cf_spi_slave { + struct spi_slave slave; + uint baudrate; + int charbit; +}; + +int cfspi_xfer(struct spi_slave *slave, uint bitlen, const void *dout, + void *din, ulong flags); +struct spi_slave *cfspi_setup_slave(struct cf_spi_slave *cfslave, uint mode); +void cfspi_init(void); +void cfspi_tx(u32 ctrl, u16 data); +u16 cfspi_rx(void); + +extern void cfspi_port_conf(void); +extern int cfspi_claim_bus(uint bus, uint cs); +extern void cfspi_release_bus(uint bus, uint cs); + +DECLARE_GLOBAL_DATA_PTR; + +#if defined(CONFIG_CF_DSPI) +/* DSPI specific mode */ +#define SPI_MODE_MOD 0x00200000 +#define SPI_DBLRATE 0x00100000 + +void cfspi_init(void) +{ + volatile dspi_t *dspi = (dspi_t *) MMAP_DSPI; + + cfspi_port_conf(); /* port configuration */ + + dspi->mcr = DSPI_MCR_MSTR | DSPI_MCR_CSIS7 | DSPI_MCR_CSIS6 | + DSPI_MCR_CSIS5 | DSPI_MCR_CSIS4 | DSPI_MCR_CSIS3 | + DSPI_MCR_CSIS2 | DSPI_MCR_CSIS1 | DSPI_MCR_CSIS0 | + DSPI_MCR_CRXF | DSPI_MCR_CTXF; + + /* Default setting in platform configuration */ +#ifdef CONFIG_SYS_DSPI_CTAR0 + dspi->ctar[0] = CONFIG_SYS_DSPI_CTAR0; +#endif +#ifdef CONFIG_SYS_DSPI_CTAR1 + dspi->ctar[1] = CONFIG_SYS_DSPI_CTAR1; +#endif +#ifdef CONFIG_SYS_DSPI_CTAR2 + dspi->ctar[2] = CONFIG_SYS_DSPI_CTAR2; +#endif +#ifdef CONFIG_SYS_DSPI_CTAR3 + dspi->ctar[3] = CONFIG_SYS_DSPI_CTAR3; +#endif +#ifdef CONFIG_SYS_DSPI_CTAR4 + dspi->ctar[4] = CONFIG_SYS_DSPI_CTAR4; +#endif +#ifdef CONFIG_SYS_DSPI_CTAR5 + dspi->ctar[5] = CONFIG_SYS_DSPI_CTAR5; +#endif +#ifdef CONFIG_SYS_DSPI_CTAR6 + dspi->ctar[6] = CONFIG_SYS_DSPI_CTAR6; +#endif +#ifdef CONFIG_SYS_DSPI_CTAR7 + dspi->ctar[7] = CONFIG_SYS_DSPI_CTAR7; +#endif +} + +void cfspi_tx(u32 ctrl, u16 data) +{ + volatile dspi_t *dspi = (dspi_t *) MMAP_DSPI; + + while ((dspi->sr & 0x0000F000) >= 4) ; + + dspi->tfr = (ctrl | data); +} + +u16 cfspi_rx(void) +{ + volatile dspi_t *dspi = (dspi_t *) MMAP_DSPI; + + while ((dspi->sr & 0x000000F0) == 0) ; + + return (dspi->rfr & 0xFFFF); +} + +int cfspi_xfer(struct spi_slave *slave, uint bitlen, const void *dout, + void *din, ulong flags) +{ + struct cf_spi_slave *cfslave = (struct cf_spi_slave *)slave; + u16 *spi_rd16 = NULL, *spi_wr16 = NULL; + u8 *spi_rd = NULL, *spi_wr = NULL; + static u32 ctrl = 0; + uint len = bitlen >> 3; + + if (cfslave->charbit == 16) { + bitlen >>= 1; + spi_wr16 = (u16 *) dout; + spi_rd16 = (u16 *) din; + } else { + spi_wr = (u8 *) dout; + spi_rd = (u8 *) din; + } + + if ((flags & SPI_XFER_BEGIN) == SPI_XFER_BEGIN) + ctrl |= DSPI_TFR_CONT; + + ctrl = (ctrl & 0xFF000000) | ((1 << slave->cs) << 16); + + if (len > 1) { + int tmp_len = len - 1; + while (tmp_len--) { + if (dout != NULL) { + if (cfslave->charbit == 16) + cfspi_tx(ctrl, *spi_wr16++); + else + cfspi_tx(ctrl, *spi_wr++); + cfspi_rx(); + } + + if (din != NULL) { + cfspi_tx(ctrl, 0); + if (cfslave->charbit == 16) + *spi_rd16++ = cfspi_rx(); + else + *spi_rd++ = cfspi_rx(); + } + } + + len = 1; /* remaining byte */ + } + + if ((flags & SPI_XFER_END) == SPI_XFER_END) + ctrl &= ~DSPI_TFR_CONT; + + if (len) { + if (dout != NULL) { + if (cfslave->charbit == 16) + cfspi_tx(ctrl, *spi_wr16); + else + cfspi_tx(ctrl, *spi_wr); + cfspi_rx(); + } + + if (din != NULL) { + cfspi_tx(ctrl, 0); + if (cfslave->charbit == 16) + *spi_rd16 = cfspi_rx(); + else + *spi_rd = cfspi_rx(); + } + } else { + /* dummy read */ + cfspi_tx(ctrl, 0); + cfspi_rx(); + } + + return 0; +} + +struct spi_slave *cfspi_setup_slave(struct cf_spi_slave *cfslave, uint mode) +{ + /* + * bit definition for mode: + * bit 31 - 28: Transfer size 3 to 16 bits + * 27 - 26: PCS to SCK delay prescaler + * 25 - 24: After SCK delay prescaler + * 23 - 22: Delay after transfer prescaler + * 21 : Allow overwrite for bit 31-22 and bit 20-8 + * 20 : Double baud rate + * 19 - 16: PCS to SCK delay scaler + * 15 - 12: After SCK delay scaler + * 11 - 8: Delay after transfer scaler + * 7 - 0: SPI_CPHA, SPI_CPOL, SPI_LSB_FIRST + */ + volatile dspi_t *dspi = (dspi_t *) MMAP_DSPI; + int prescaler[] = { 2, 3, 5, 7 }; + int scaler[] = { + 2, 4, 6, 8, + 16, 32, 64, 128, + 256, 512, 1024, 2048, + 4096, 8192, 16384, 32768 + }; + int i, j, pbrcnt, brcnt, diff, tmp, dbr = 0; + int best_i, best_j, bestmatch = 0x7FFFFFFF, baud_speed; + u32 bus_setup = 0; + + tmp = (prescaler[3] * scaler[15]); + /* Maximum and minimum baudrate it can handle */ + if ((cfslave->baudrate > (gd->bus_clk >> 1)) || + (cfslave->baudrate < (gd->bus_clk / tmp))) { + printf("Exceed baudrate limitation: Max %d - Min %d\n", + (int)(gd->bus_clk >> 1), (int)(gd->bus_clk / tmp)); + return NULL; + } + + /* Activate Double Baud when it exceed 1/4 the bus clk */ + if ((CONFIG_SYS_DSPI_CTAR0 & DSPI_CTAR_DBR) || + (cfslave->baudrate > (gd->bus_clk / (prescaler[0] * scaler[0])))) { + bus_setup |= DSPI_CTAR_DBR; + dbr = 1; + } + + if (mode & SPI_CPOL) + bus_setup |= DSPI_CTAR_CPOL; + if (mode & SPI_CPHA) + bus_setup |= DSPI_CTAR_CPHA; + if (mode & SPI_LSB_FIRST) + bus_setup |= DSPI_CTAR_LSBFE; + + /* Overwrite default value set in platform configuration file */ + if (mode & SPI_MODE_MOD) { + + if ((mode & 0xF0000000) == 0) + bus_setup |= + dspi->ctar[cfslave->slave.bus] & 0x78000000; + else + bus_setup |= ((mode & 0xF0000000) >> 1); + + /* + * Check to see if it is enabled by default in platform + * config, or manual setting passed by mode parameter + */ + if (mode & SPI_DBLRATE) { + bus_setup |= DSPI_CTAR_DBR; + dbr = 1; + } + bus_setup |= (mode & 0x0FC00000) >> 4; /* PSCSCK, PASC, PDT */ + bus_setup |= (mode & 0x000FFF00) >> 4; /* CSSCK, ASC, DT */ + } else + bus_setup |= (dspi->ctar[cfslave->slave.bus] & 0x78FCFFF0); + + cfslave->charbit = + ((dspi->ctar[cfslave->slave.bus] & 0x78000000) == + 0x78000000) ? 16 : 8; + + pbrcnt = sizeof(prescaler) / sizeof(int); + brcnt = sizeof(scaler) / sizeof(int); + + /* baudrate calculation - to closer value, may not be exact match */ + for (best_i = 0, best_j = 0, i = 0; i < pbrcnt; i++) { + baud_speed = gd->bus_clk / prescaler[i]; + for (j = 0; j < brcnt; j++) { + tmp = (baud_speed / scaler[j]) * (1 + dbr); + + if (tmp > cfslave->baudrate) + diff = tmp - cfslave->baudrate; + else + diff = cfslave->baudrate - tmp; + + if (diff < bestmatch) { + bestmatch = diff; + best_i = i; + best_j = j; + } + } + } + bus_setup |= (DSPI_CTAR_PBR(best_i) | DSPI_CTAR_BR(best_j)); + dspi->ctar[cfslave->slave.bus] = bus_setup; + + return &cfslave->slave; +} +#endif /* CONFIG_CF_DSPI */ + +#ifdef CONFIG_CF_QSPI +/* 52xx, 53xx */ +#endif /* CONFIG_CF_QSPI */ + +#ifdef CONFIG_CMD_SPI +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; +} + +void spi_init_f(void) +{ +} + +void spi_init_r(void) +{ +} + +void spi_init(void) +{ + cfspi_init(); +} + +struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, + unsigned int max_hz, unsigned int mode) +{ + struct cf_spi_slave *cfslave; + + if (!spi_cs_is_valid(bus, cs)) + return NULL; + + cfslave = malloc(sizeof(struct cf_spi_slave)); + if (!cfslave) + return NULL; + + cfslave->slave.bus = bus; + cfslave->slave.cs = cs; + cfslave->baudrate = max_hz; + + /* specific setup */ + return cfspi_setup_slave(cfslave, mode); +} + +void spi_free_slave(struct spi_slave *slave) +{ + free(slave); +} + +int spi_claim_bus(struct spi_slave *slave) +{ + return cfspi_claim_bus(slave->bus, slave->cs); +} + +void spi_release_bus(struct spi_slave *slave) +{ + cfspi_release_bus(slave->bus, slave->cs); +} + +int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, + void *din, unsigned long flags) +{ + return cfspi_xfer(slave, bitlen, dout, din, flags); +} +#endif /* CONFIG_CMD_SPI */ |