diff options
Diffstat (limited to 'drivers/spi/bfin_spi6xx.c')
| -rw-r--r-- | drivers/spi/bfin_spi6xx.c | 305 |
1 files changed, 0 insertions, 305 deletions
diff --git a/drivers/spi/bfin_spi6xx.c b/drivers/spi/bfin_spi6xx.c deleted file mode 100644 index 9a27b78f64..0000000000 --- a/drivers/spi/bfin_spi6xx.c +++ /dev/null @@ -1,305 +0,0 @@ -/* - * 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 <console.h> -#include <malloc.h> -#include <spi.h> - -#include <asm/blackfin.h> -#include <asm/clock.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 |= BIT(8) << slave->cs; - else - ssel &= ~(BIT(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 &= ~(BIT(8) << slave->cs); - else - ssel |= BIT(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) \ - { 0, P_SPI##n##_SCK, P_SPI##n##_MISO, P_SPI##n##_MOSI, 0 } -static unsigned short pins[][5] = { -#ifdef SPI0_REGBASE - [0] = SPI_PINS(0), -#endif -#ifdef SPI1_REGBASE - [1] = SPI_PINS(1), -#endif -#ifdef SPI2_REGBASE - [2] = SPI_PINS(2), -#endif -}; - -#define SPI_CS_PINS(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 - [0] = SPI_CS_PINS(0), -#endif -#ifdef SPI1_REGBASE - [1] = SPI_CS_PINS(1), -#endif -#ifdef SPI2_REGBASE - [2] = 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 clk; - u32 clock; - - clk = get_spi_clk(); - clock = clk / 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; - - 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: - debug("%s: invalid bus %u\n", __func__, bus); - return NULL; - } - - bss = spi_alloc_slave(struct bfin_spi_slave, bus, cs); - if (!bss) - return NULL; - - 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; -} |