From: Scott Jiang scott.jiang.linux@gmail.com
Spi driver for bf60x is different from old one, so implement a new driver for it.
Signed-off-by: Scott Jiang scott.jiang.linux@gmail.com Signed-off-by: Sonic Zhang sonic.zhang@analog.com Signed-off-by: Bob Liu lliubbo@gmail.com --- .../blackfin/include/asm/mach-common/bits/spi6xx.h | 240 +++++++++++++++ drivers/spi/Makefile | 1 + drivers/spi/bfin_spi6xx.c | 308 ++++++++++++++++++++ 3 files changed, 549 insertions(+), 0 deletions(-) create mode 100644 arch/blackfin/include/asm/mach-common/bits/spi6xx.h create mode 100644 drivers/spi/bfin_spi6xx.c
diff --git a/arch/blackfin/include/asm/mach-common/bits/spi6xx.h b/arch/blackfin/include/asm/mach-common/bits/spi6xx.h new file mode 100644 index 0000000..8b8dd25 --- /dev/null +++ b/arch/blackfin/include/asm/mach-common/bits/spi6xx.h @@ -0,0 +1,240 @@ +/* + * Analog Devices bfin_spi3 controller driver + * + * Copyright (c) 2011 Analog Devices Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#ifndef _SPI_CHANNEL_H_ +#define _SPI_CHANNEL_H_ + +#include <linux/types.h> + +/* SPI_CONTROL */ +#define SPI_CTL_EN 0x00000001 /* Enable */ +#define SPI_CTL_MSTR 0x00000002 /* Master/Slave */ +#define SPI_CTL_PSSE 0x00000004 /* controls modf error in master mode */ +#define SPI_CTL_ODM 0x00000008 /* Open Drain Mode */ +#define SPI_CTL_CPHA 0x00000010 /* Clock Phase */ +#define SPI_CTL_CPOL 0x00000020 /* Clock Polarity */ +#define SPI_CTL_ASSEL 0x00000040 /* Slave Select Pin Control */ +#define SPI_CTL_SELST 0x00000080 /* Slave Select Polarity in-between transfers */ +#define SPI_CTL_EMISO 0x00000100 /* Enable MISO */ +#define SPI_CTL_SIZE 0x00000600 /* Word Transfer Size */ +#define SPI_CTL_SIZE08 0x00000000 /* SIZE: 8 bits */ +#define SPI_CTL_SIZE16 0x00000200 /* SIZE: 16 bits */ +#define SPI_CTL_SIZE32 0x00000400 /* SIZE: 32 bits */ +#define SPI_CTL_LSBF 0x00001000 /* LSB First */ +#define SPI_CTL_FCEN 0x00002000 /* Flow-Control Enable */ +#define SPI_CTL_FCCH 0x00004000 /* Flow-Control Channel Selection */ +#define SPI_CTL_FCPL 0x00008000 /* Flow-Control Polarity */ +#define SPI_CTL_FCWM 0x00030000 /* Flow-Control Water-Mark */ +#define SPI_CTL_FIFO0 0x00000000 /* FCWM: TFIFO empty or RFIFO Full */ +#define SPI_CTL_FIFO1 0x00010000 /* FCWM: TFIFO 75% or more empty or RFIFO 75% or more full */ +#define SPI_CTL_FIFO2 0x00020000 /* FCWM: TFIFO 50% or more empty or RFIFO 50% or more full */ +#define SPI_CTL_FMODE 0x00040000 /* Fast-mode Enable */ +#define SPI_CTL_MIOM 0x00300000 /* Multiple I/O Mode */ +#define SPI_CTL_MIO_DIS 0x00000000 /* MIOM: Disable */ +#define SPI_CTL_MIO_DUAL 0x00100000 /* MIOM: Enable DIOM (Dual I/O Mode) */ +#define SPI_CTL_MIO_QUAD 0x00200000 /* MIOM: Enable QUAD (Quad SPI Mode) */ +#define SPI_CTL_SOSI 0x00400000 /* Start on MOSI */ +/* SPI_RX_CONTROL */ +#define SPI_RXCTL_REN 0x00000001 /* Receive Channel Enable */ +#define SPI_RXCTL_RTI 0x00000004 /* Receive Transfer Initiate */ +#define SPI_RXCTL_RWCEN 0x00000008 /* Receive Word Counter Enable */ +#define SPI_RXCTL_RDR 0x00000070 /* Receive Data Request */ +#define SPI_RXCTL_RDR_DIS 0x00000000 /* RDR: Disabled */ +#define SPI_RXCTL_RDR_NE 0x00000010 /* RDR: RFIFO not empty */ +#define SPI_RXCTL_RDR_25 0x00000020 /* RDR: RFIFO 25% full */ +#define SPI_RXCTL_RDR_50 0x00000030 /* RDR: RFIFO 50% full */ +#define SPI_RXCTL_RDR_75 0x00000040 /* RDR: RFIFO 75% full */ +#define SPI_RXCTL_RDR_FULL 0x00000050 /* RDR: RFIFO full */ +#define SPI_RXCTL_RDO 0x00000100 /* Receive Data Over-Run */ +#define SPI_RXCTL_RRWM 0x00003000 /* FIFO Regular Water-Mark */ +#define SPI_RXCTL_RWM_0 0x00000000 /* RRWM: RFIFO Empty */ +#define SPI_RXCTL_RWM_25 0x00001000 /* RRWM: RFIFO 25% full */ +#define SPI_RXCTL_RWM_50 0x00002000 /* RRWM: RFIFO 50% full */ +#define SPI_RXCTL_RWM_75 0x00003000 /* RRWM: RFIFO 75% full */ +#define SPI_RXCTL_RUWM 0x00070000 /* FIFO Urgent Water-Mark */ +#define SPI_RXCTL_UWM_DIS 0x00000000 /* RUWM: Disabled */ +#define SPI_RXCTL_UWM_25 0x00010000 /* RUWM: RFIFO 25% full */ +#define SPI_RXCTL_UWM_50 0x00020000 /* RUWM: RFIFO 50% full */ +#define SPI_RXCTL_UWM_75 0x00030000 /* RUWM: RFIFO 75% full */ +#define SPI_RXCTL_UWM_FULL 0x00040000 /* RUWM: RFIFO full */ +/* SPI_TX_CONTROL */ +#define SPI_TXCTL_TEN 0x00000001 /* Transmit Channel Enable */ +#define SPI_TXCTL_TTI 0x00000004 /* Transmit Transfer Initiate */ +#define SPI_TXCTL_TWCEN 0x00000008 /* Transmit Word Counter Enable */ +#define SPI_TXCTL_TDR 0x00000070 /* Transmit Data Request */ +#define SPI_TXCTL_TDR_DIS 0x00000000 /* TDR: Disabled */ +#define SPI_TXCTL_TDR_NF 0x00000010 /* TDR: TFIFO not full */ +#define SPI_TXCTL_TDR_25 0x00000020 /* TDR: TFIFO 25% empty */ +#define SPI_TXCTL_TDR_50 0x00000030 /* TDR: TFIFO 50% empty */ +#define SPI_TXCTL_TDR_75 0x00000040 /* TDR: TFIFO 75% empty */ +#define SPI_TXCTL_TDR_EMPTY 0x00000050 /* TDR: TFIFO empty */ +#define SPI_TXCTL_TDU 0x00000100 /* Transmit Data Under-Run */ +#define SPI_TXCTL_TRWM 0x00003000 /* FIFO Regular Water-Mark */ +#define SPI_TXCTL_RWM_FULL 0x00000000 /* TRWM: TFIFO full */ +#define SPI_TXCTL_RWM_25 0x00001000 /* TRWM: TFIFO 25% empty */ +#define SPI_TXCTL_RWM_50 0x00002000 /* TRWM: TFIFO 50% empty */ +#define SPI_TXCTL_RWM_75 0x00003000 /* TRWM: TFIFO 75% empty */ +#define SPI_TXCTL_TUWM 0x00070000 /* FIFO Urgent Water-Mark */ +#define SPI_TXCTL_UWM_DIS 0x00000000 /* TUWM: Disabled */ +#define SPI_TXCTL_UWM_25 0x00010000 /* TUWM: TFIFO 25% empty */ +#define SPI_TXCTL_UWM_50 0x00020000 /* TUWM: TFIFO 50% empty */ +#define SPI_TXCTL_UWM_75 0x00030000 /* TUWM: TFIFO 75% empty */ +#define SPI_TXCTL_UWM_EMPTY 0x00040000 /* TUWM: TFIFO empty */ +/* SPI_CLOCK */ +#define SPI_CLK_BAUD 0x0000FFFF /* Baud Rate */ +/* SPI_DELAY */ +#define SPI_DLY_STOP 0x000000FF /* Transfer delay time in multiples of SCK period */ +#define SPI_DLY_LEADX 0x00000100 /* Extended (1 SCK) LEAD Control */ +#define SPI_DLY_LAGX 0x00000200 /* Extended (1 SCK) LAG control */ +/* SPI_SSEL */ +#define SPI_SLVSEL_SSE1 0x00000002 /* SPISSEL1 Enable */ +#define SPI_SLVSEL_SSE2 0x00000004 /* SPISSEL2 Enable */ +#define SPI_SLVSEL_SSE3 0x00000008 /* SPISSEL3 Enable */ +#define SPI_SLVSEL_SSE4 0x00000010 /* SPISSEL4 Enable */ +#define SPI_SLVSEL_SSE5 0x00000020 /* SPISSEL5 Enable */ +#define SPI_SLVSEL_SSE6 0x00000040 /* SPISSEL6 Enable */ +#define SPI_SLVSEL_SSE7 0x00000080 /* SPISSEL7 Enable */ +#define SPI_SLVSEL_SSEL1 0x00000200 /* SPISSEL1 Value */ +#define SPI_SLVSEL_SSEL2 0x00000400 /* SPISSEL2 Value */ +#define SPI_SLVSEL_SSEL3 0x00000800 /* SPISSEL3 Value */ +#define SPI_SLVSEL_SSEL4 0x00001000 /* SPISSEL4 Value */ +#define SPI_SLVSEL_SSEL5 0x00002000 /* SPISSEL5 Value */ +#define SPI_SLVSEL_SSEL6 0x00004000 /* SPISSEL6 Value */ +#define SPI_SLVSEL_SSEL7 0x00008000 /* SPISSEL7 Value */ +/* SPI_RWC */ +#define SPI_RWC_VALUE 0x0000FFFF /* Received Word-Count */ +/* SPI_RWCR */ +#define SPI_RWCR_VALUE 0x0000FFFF /* Received Word-Count Reload */ +/* SPI_TWC */ +#define SPI_TWC_VALUE 0x0000FFFF /* Transmitted Word-Count */ +/* SPI_TWCR */ +#define SPI_TWCR_VALUE 0x0000FFFF /* Transmitted Word-Count Reload */ +/* SPI_IMASK */ +#define SPI_IMSK_RUWM 0x00000002 /* Receive Urgent Water-Mark Interrupt Mask */ +#define SPI_IMSK_TUWM 0x00000004 /* Transmit Urgent Water-Mark Interrupt Mask */ +#define SPI_IMSK_ROM 0x00000010 /* Receive Over-Run Error Interrupt Mask */ +#define SPI_IMSK_TUM 0x00000020 /* Transmit Under-Run Error Interrupt Mask */ +#define SPI_IMSK_TCM 0x00000040 /* Transmit Collision Error Interrupt Mask */ +#define SPI_IMSK_MFM 0x00000080 /* Mode Fault Error Interrupt Mask */ +#define SPI_IMSK_RSM 0x00000100 /* Receive Start Interrupt Mask */ +#define SPI_IMSK_TSM 0x00000200 /* Transmit Start Interrupt Mask */ +#define SPI_IMSK_RFM 0x00000400 /* Receive Finish Interrupt Mask */ +#define SPI_IMSK_TFM 0x00000800 /* Transmit Finish Interrupt Mask */ +/* SPI_IMASKCL */ +#define SPI_IMSK_CLR_RUW 0x00000002 /* Receive Urgent Water-Mark Interrupt Mask */ +#define SPI_IMSK_CLR_TUWM 0x00000004 /* Transmit Urgent Water-Mark Interrupt Mask */ +#define SPI_IMSK_CLR_ROM 0x00000010 /* Receive Over-Run Error Interrupt Mask */ +#define SPI_IMSK_CLR_TUM 0x00000020 /* Transmit Under-Run Error Interrupt Mask */ +#define SPI_IMSK_CLR_TCM 0x00000040 /* Transmit Collision Error Interrupt Mask */ +#define SPI_IMSK_CLR_MFM 0x00000080 /* Mode Fault Error Interrupt Mask */ +#define SPI_IMSK_CLR_RSM 0x00000100 /* Receive Start Interrupt Mask */ +#define SPI_IMSK_CLR_TSM 0x00000200 /* Transmit Start Interrupt Mask */ +#define SPI_IMSK_CLR_RFM 0x00000400 /* Receive Finish Interrupt Mask */ +#define SPI_IMSK_CLR_TFM 0x00000800 /* Transmit Finish Interrupt Mask */ +/* SPI_IMASKST */ +#define SPI_IMSK_SET_RUWM 0x00000002 /* Receive Urgent Water-Mark Interrupt Mask */ +#define SPI_IMSK_SET_TUWM 0x00000004 /* Transmit Urgent Water-Mark Interrupt Mask */ +#define SPI_IMSK_SET_ROM 0x00000010 /* Receive Over-Run Error Interrupt Mask */ +#define SPI_IMSK_SET_TUM 0x00000020 /* Transmit Under-Run Error Interrupt Mask */ +#define SPI_IMSK_SET_TCM 0x00000040 /* Transmit Collision Error Interrupt Mask */ +#define SPI_IMSK_SET_MFM 0x00000080 /* Mode Fault Error Interrupt Mask */ +#define SPI_IMSK_SET_RSM 0x00000100 /* Receive Start Interrupt Mask */ +#define SPI_IMSK_SET_TSM 0x00000200 /* Transmit Start Interrupt Mask */ +#define SPI_IMSK_SET_RFM 0x00000400 /* Receive Finish Interrupt Mask */ +#define SPI_IMSK_SET_TFM 0x00000800 /* Transmit Finish Interrupt Mask */ +/* SPI_STATUS */ +#define SPI_STAT_SPIF 0x00000001 /* SPI Finished */ +#define SPI_STAT_RUWM 0x00000002 /* Receive Urgent Water-Mark Breached */ +#define SPI_STAT_TUWM 0x00000004 /* Transmit Urgent Water-Mark Breached */ +#define SPI_STAT_ROE 0x00000010 /* Receive Over-Run Error Indication */ +#define SPI_STAT_TUE 0x00000020 /* Transmit Under-Run Error Indication */ +#define SPI_STAT_TCE 0x00000040 /* Transmit Collision Error Indication */ +#define SPI_STAT_MODF 0x00000080 /* Mode Fault Error Indication */ +#define SPI_STAT_RS 0x00000100 /* Receive Start Indication */ +#define SPI_STAT_TS 0x00000200 /* Transmit Start Indication */ +#define SPI_STAT_RF 0x00000400 /* Receive Finish Indication */ +#define SPI_STAT_TF 0x00000800 /* Transmit Finish Indication */ +#define SPI_STAT_RFS 0x00007000 /* SPI_RFIFO status */ +#define SPI_STAT_RFIFO_EMPTY 0x00000000 /* RFS: RFIFO Empty */ +#define SPI_STAT_RFIFO_25 0x00001000 /* RFS: RFIFO 25% Full */ +#define SPI_STAT_RFIFO_50 0x00002000 /* RFS: RFIFO 50% Full */ +#define SPI_STAT_RFIFO_75 0x00003000 /* RFS: RFIFO 75% Full */ +#define SPI_STAT_RFIFO_FULL 0x00004000 /* RFS: RFIFO Full */ +#define SPI_STAT_TFS 0x00070000 /* SPI_TFIFO status */ +#define SPI_STAT_TFIFO_FULL 0x00000000 /* TFS: TFIFO full */ +#define SPI_STAT_TFIFO_25 0x00010000 /* TFS: TFIFO 25% empty */ +#define SPI_STAT_TFIFO_50 0x00020000 /* TFS: TFIFO 50% empty */ +#define SPI_STAT_TFIFO_75 0x00030000 /* TFS: TFIFO 75% empty */ +#define SPI_STAT_TFIFO_EMPTY 0x00040000 /* TFS: TFIFO empty */ +#define SPI_STAT_FCS 0x00100000 /* Flow-Control Stall Indication */ +#define SPI_STAT_RFE 0x00400000 /* SPI_RFIFO Empty */ +#define SPI_STAT_TFF 0x00800000 /* SPI_TFIFO Full */ +/* SPI_ILAT */ +#define SPI_ILAT_RUWMI 0x00000002 /* Receive Urgent Water Mark Interrupt */ +#define SPI_ILAT_TUWMI 0x00000004 /* Transmit Urgent Water Mark Interrupt */ +#define SPI_ILAT_ROI 0x00000010 /* Receive Over-Run Error Indication */ +#define SPI_ILAT_TUI 0x00000020 /* Transmit Under-Run Error Indication */ +#define SPI_ILAT_TCI 0x00000040 /* Transmit Collision Error Indication */ +#define SPI_ILAT_MFI 0x00000080 /* Mode Fault Error Indication */ +#define SPI_ILAT_RSI 0x00000100 /* Receive Start Indication */ +#define SPI_ILAT_TSI 0x00000200 /* Transmit Start Indication */ +#define SPI_ILAT_RFI 0x00000400 /* Receive Finish Indication */ +#define SPI_ILAT_TFI 0x00000800 /* Transmit Finish Indication */ +/* SPI_ILATCL */ +#define SPI_ILAT_CLR_RUWMI 0x00000002 /* Receive Urgent Water Mark Interrupt */ +#define SPI_ILAT_CLR_TUWMI 0x00000004 /* Transmit Urgent Water Mark Interrupt */ +#define SPI_ILAT_CLR_ROI 0x00000010 /* Receive Over-Run Error Indication */ +#define SPI_ILAT_CLR_TUI 0x00000020 /* Transmit Under-Run Error Indication */ +#define SPI_ILAT_CLR_TCI 0x00000040 /* Transmit Collision Error Indication */ +#define SPI_ILAT_CLR_MFI 0x00000080 /* Mode Fault Error Indication */ +#define SPI_ILAT_CLR_RSI 0x00000100 /* Receive Start Indication */ +#define SPI_ILAT_CLR_TSI 0x00000200 /* Transmit Start Indication */ +#define SPI_ILAT_CLR_RFI 0x00000400 /* Receive Finish Indication */ +#define SPI_ILAT_CLR_TFI 0x00000800 /* Transmit Finish Indication */ + +/* + * bfin spi3 registers layout + */ +struct bfin_spi_regs { + u32 revid; + u32 control; + u32 rx_control; + u32 tx_control; + u32 clock; + u32 delay; + u32 ssel; + u32 rwc; + u32 rwcr; + u32 twc; + u32 twcr; + u32 reserved0; + u32 emask; + u32 emaskcl; + u32 emaskst; + u32 reserved1; + u32 status; + u32 elat; + u32 elatcl; + u32 reserved2; + u32 rfifo; + u32 reserved3; + u32 tfifo; +}; + +#endif /* _SPI_CHANNEL_H_ */ diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 824d357..42aa1a7 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -31,6 +31,7 @@ COBJS-$(CONFIG_ARMADA100_SPI) += armada100_spi.o COBJS-$(CONFIG_ATMEL_DATAFLASH_SPI) += atmel_dataflash_spi.o COBJS-$(CONFIG_ATMEL_SPI) += atmel_spi.o COBJS-$(CONFIG_BFIN_SPI) += bfin_spi.o +COBJS-$(CONFIG_BFIN_SPI6XX) += bfin_spi6xx.o COBJS-$(CONFIG_CF_SPI) += cf_spi.o COBJS-$(CONFIG_CF_QSPI) += cf_qspi.o COBJS-$(CONFIG_DAVINCI_SPI) += davinci_spi.o diff --git a/drivers/spi/bfin_spi6xx.c b/drivers/spi/bfin_spi6xx.c new file mode 100644 index 0000000..be1ae70 --- /dev/null +++ b/drivers/spi/bfin_spi6xx.c @@ -0,0 +1,308 @@ +/* + * Analog Devices SPI3 controller driver + * + * Copyright (c) 2011 Analog Devices Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <common.h> +#include <malloc.h> +#include <spi.h> + +#include <asm/blackfin.h> +#include <asm/gpio.h> +#include <asm/portmux.h> +#include <asm/mach-common/bits/spi6xx.h> + +struct bfin_spi_slave { + struct spi_slave slave; + u32 control, clock; + struct bfin_spi_regs *regs; + int cs_pol; +}; + +#define to_bfin_spi_slave(s) container_of(s, struct bfin_spi_slave, slave) + +#define gpio_cs(cs) ((cs) - MAX_CTRL_CS) +#ifdef CONFIG_BFIN_SPI_GPIO_CS +# define is_gpio_cs(cs) ((cs) > MAX_CTRL_CS) +#else +# define is_gpio_cs(cs) 0 +#endif + +int spi_cs_is_valid(unsigned int bus, unsigned int cs) +{ + if (is_gpio_cs(cs)) + return gpio_is_valid(gpio_cs(cs)); + else + return (cs >= 1 && cs <= MAX_CTRL_CS); +} + +void spi_cs_activate(struct spi_slave *slave) +{ + struct bfin_spi_slave *bss = to_bfin_spi_slave(slave); + + if (is_gpio_cs(slave->cs)) { + unsigned int cs = gpio_cs(slave->cs); + gpio_set_value(cs, bss->cs_pol); + } else { + u32 ssel; + ssel = bfin_read32(&bss->regs->ssel); + ssel |= 1 << slave->cs; + if (bss->cs_pol) + ssel |= (1 << 8) << slave->cs; + else + ssel &= ~((1 << 8) << slave->cs); + bfin_write32(&bss->regs->ssel, ssel); + } + + SSYNC(); +} + +void spi_cs_deactivate(struct spi_slave *slave) +{ + struct bfin_spi_slave *bss = to_bfin_spi_slave(slave); + + if (is_gpio_cs(slave->cs)) { + unsigned int cs = gpio_cs(slave->cs); + gpio_set_value(cs, !bss->cs_pol); + } else { + u32 ssel; + ssel = bfin_read32(&bss->regs->ssel); + if (bss->cs_pol) + ssel &= ~((1 << 8) << slave->cs); + else + ssel |= (1 << 8) << slave->cs; + /* deassert cs */ + bfin_write32(&bss->regs->ssel, ssel); + SSYNC(); + /* disable cs */ + ssel &= ~(1 << slave->cs); + bfin_write32(&bss->regs->ssel, ssel); + } + + SSYNC(); +} + +void spi_init() +{ +} + +#define SPI_PINS(n) \ + [n] = { 0, P_SPI##n##_SCK, P_SPI##n##_MISO, P_SPI##n##_MOSI, 0 } +static unsigned short pins[][5] = { +#ifdef SPI0_REGBASE + SPI_PINS(0), +#endif +#ifdef SPI1_REGBASE + SPI_PINS(1), +#endif +#ifdef SPI2_REGBASE + SPI_PINS(2), +#endif +}; + +#define SPI_CS_PINS(n) \ + [n] = { \ + P_SPI##n##_SSEL1, P_SPI##n##_SSEL2, P_SPI##n##_SSEL3, \ + P_SPI##n##_SSEL4, P_SPI##n##_SSEL5, P_SPI##n##_SSEL6, \ + P_SPI##n##_SSEL7, \ + } +static const unsigned short cs_pins[][7] = { +#ifdef SPI0_REGBASE + SPI_CS_PINS(0), +#endif +#ifdef SPI1_REGBASE + SPI_CS_PINS(1), +#endif +#ifdef SPI2_REGBASE + SPI_CS_PINS(2), +#endif +}; + +void spi_set_speed(struct spi_slave *slave, uint hz) +{ + struct bfin_spi_slave *bss = to_bfin_spi_slave(slave); + ulong sclk; + u32 clock; + + sclk = get_sclk1(); + clock = sclk / hz; + if (clock) + clock--; + bss->clock = clock; +} + +struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, + unsigned int max_hz, unsigned int mode) +{ + struct bfin_spi_slave *bss; + u32 reg_base; + + if (!spi_cs_is_valid(bus, cs)) + return NULL; + + if (bus >= ARRAY_SIZE(pins) || pins[bus] == NULL) { + debug("%s: invalid bus %u\n", __func__, bus); + return NULL; + } + switch (bus) { +#ifdef SPI0_REGBASE + case 0: + reg_base = SPI0_REGBASE; + break; +#endif +#ifdef SPI1_REGBASE + case 1: + reg_base = SPI1_REGBASE; + break; +#endif +#ifdef SPI2_REGBASE + case 2: + reg_base = SPI2_REGBASE; + break; +#endif + default: + return NULL; + } + + bss = malloc(sizeof(*bss)); + if (!bss) + return NULL; + + bss->slave.bus = bus; + bss->slave.cs = cs; + bss->regs = (struct bfin_spi_regs *)reg_base; + bss->control = SPI_CTL_EN | SPI_CTL_MSTR; + if (mode & SPI_CPHA) + bss->control |= SPI_CTL_CPHA; + if (mode & SPI_CPOL) + bss->control |= SPI_CTL_CPOL; + if (mode & SPI_LSB_FIRST) + bss->control |= SPI_CTL_LSBF; + bss->control &= ~SPI_CTL_ASSEL; + bss->cs_pol = mode & SPI_CS_HIGH ? 1 : 0; + spi_set_speed(&bss->slave, max_hz); + + return &bss->slave; +} + +void spi_free_slave(struct spi_slave *slave) +{ + struct bfin_spi_slave *bss = to_bfin_spi_slave(slave); + free(bss); +} + +int spi_claim_bus(struct spi_slave *slave) +{ + struct bfin_spi_slave *bss = to_bfin_spi_slave(slave); + + debug("%s: bus:%i cs:%i\n", __func__, slave->bus, slave->cs); + + if (is_gpio_cs(slave->cs)) { + unsigned int cs = gpio_cs(slave->cs); + gpio_request(cs, "bfin-spi"); + gpio_direction_output(cs, !bss->cs_pol); + pins[slave->bus][0] = P_DONTCARE; + } else + pins[slave->bus][0] = cs_pins[slave->bus][slave->cs - 1]; + peripheral_request_list(pins[slave->bus], "bfin-spi"); + + bfin_write32(&bss->regs->control, bss->control); + bfin_write32(&bss->regs->clock, bss->clock); + bfin_write32(&bss->regs->delay, 0x0); + bfin_write32(&bss->regs->rx_control, SPI_RXCTL_REN); + bfin_write32(&bss->regs->tx_control, SPI_TXCTL_TEN | SPI_TXCTL_TTI); + SSYNC(); + + return 0; +} + +void spi_release_bus(struct spi_slave *slave) +{ + struct bfin_spi_slave *bss = to_bfin_spi_slave(slave); + + debug("%s: bus:%i cs:%i\n", __func__, slave->bus, slave->cs); + + peripheral_free_list(pins[slave->bus]); + if (is_gpio_cs(slave->cs)) + gpio_free(gpio_cs(slave->cs)); + + bfin_write32(&bss->regs->rx_control, 0x0); + bfin_write32(&bss->regs->tx_control, 0x0); + bfin_write32(&bss->regs->control, 0x0); + SSYNC(); +} + +#ifndef CONFIG_BFIN_SPI_IDLE_VAL +# define CONFIG_BFIN_SPI_IDLE_VAL 0xff +#endif + +static int spi_pio_xfer(struct bfin_spi_slave *bss, const u8 *tx, u8 *rx, + uint bytes) +{ + /* discard invalid rx data and empty rfifo */ + while (!(bfin_read32(&bss->regs->status) & SPI_STAT_RFE)) + bfin_read32(&bss->regs->rfifo); + + while (bytes--) { + u8 value = (tx ? *tx++ : CONFIG_BFIN_SPI_IDLE_VAL); + debug("%s: tx:%x ", __func__, value); + bfin_write32(&bss->regs->tfifo, value); + SSYNC(); + while (bfin_read32(&bss->regs->status) & SPI_STAT_RFE) + if (ctrlc()) + return -1; + value = bfin_read32(&bss->regs->rfifo); + if (rx) + *rx++ = value; + debug("rx:%x\n", value); + } + + return 0; +} + +int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, + void *din, unsigned long flags) +{ + struct bfin_spi_slave *bss = to_bfin_spi_slave(slave); + const u8 *tx = dout; + u8 *rx = din; + uint bytes = bitlen / 8; + int ret = 0; + + debug("%s: bus:%i cs:%i bitlen:%i bytes:%i flags:%lx\n", __func__, + slave->bus, slave->cs, bitlen, bytes, flags); + + if (bitlen == 0) + goto done; + + /* we can only do 8 bit transfers */ + if (bitlen % 8) { + flags |= SPI_XFER_END; + goto done; + } + + if (flags & SPI_XFER_BEGIN) + spi_cs_activate(slave); + + ret = spi_pio_xfer(bss, tx, rx, bytes); + + done: + if (flags & SPI_XFER_END) + spi_cs_deactivate(slave); + + return ret; +}