X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=drivers%2Fspi%2Fkirkwood_spi.c;h=6851ba942f51a14d72779f9c78eb5e0783ee7c32;hb=c6f086ddcbfb47918b82f6a135c61f432540da42;hp=7d1c1f93a52663c7ae220973d17c44256a04eb29;hpb=0299046e5b4eec6c79927324deab857db1689e92;p=u-boot diff --git a/drivers/spi/kirkwood_spi.c b/drivers/spi/kirkwood_spi.c index 7d1c1f93a5..6851ba942f 100644 --- a/drivers/spi/kirkwood_spi.c +++ b/drivers/spi/kirkwood_spi.c @@ -9,26 +9,111 @@ */ #include +#include #include #include #include -#include -#include +#include +#ifdef CONFIG_KIRKWOOD #include +#endif +#include + +static void _spi_cs_activate(struct kwspi_registers *reg) +{ + setbits_le32(®->ctrl, KWSPI_CSN_ACT); +} + +static void _spi_cs_deactivate(struct kwspi_registers *reg) +{ + clrbits_le32(®->ctrl, KWSPI_CSN_ACT); +} + +static int _spi_xfer(struct kwspi_registers *reg, unsigned int bitlen, + const void *dout, void *din, unsigned long flags) +{ + unsigned int tmpdout, tmpdin; + int tm, isread = 0; + + debug("spi_xfer: dout %p din %p bitlen %u\n", dout, din, bitlen); + + if (flags & SPI_XFER_BEGIN) + _spi_cs_activate(reg); + + /* + * handle data in 8-bit chunks + * TBD: 2byte xfer mode to be enabled + */ + clrsetbits_le32(®->cfg, KWSPI_XFERLEN_MASK, KWSPI_XFERLEN_1BYTE); -static struct kwspi_registers *spireg = (struct kwspi_registers *)KW_SPI_BASE; + while (bitlen > 4) { + debug("loopstart bitlen %d\n", bitlen); + tmpdout = 0; + /* Shift data so it's msb-justified */ + if (dout) + tmpdout = *(u32 *)dout & 0xff; + + clrbits_le32(®->irq_cause, KWSPI_SMEMRDIRQ); + writel(tmpdout, ®->dout); /* Write the data out */ + debug("*** spi_xfer: ... %08x written, bitlen %d\n", + tmpdout, bitlen); + + /* + * Wait for SPI transmit to get out + * or time out (1 second = 1000 ms) + * The NE event must be read and cleared first + */ + for (tm = 0, isread = 0; tm < KWSPI_TIMEOUT; ++tm) { + if (readl(®->irq_cause) & KWSPI_SMEMRDIRQ) { + isread = 1; + tmpdin = readl(®->din); + debug("spi_xfer: din %p..%08x read\n", + din, tmpdin); + + if (din) { + *((u8 *)din) = (u8)tmpdin; + din += 1; + } + if (dout) + dout += 1; + bitlen -= 8; + } + if (isread) + break; + } + if (tm >= KWSPI_TIMEOUT) + printf("*** spi_xfer: Time out during SPI transfer\n"); + + debug("loopend bitlen %d\n", bitlen); + } + + if (flags & SPI_XFER_END) + _spi_cs_deactivate(reg); + + return 0; +} + +#ifndef CONFIG_DM_SPI + +static struct kwspi_registers *spireg = + (struct kwspi_registers *)MVEBU_SPI_BASE; + +#ifdef CONFIG_KIRKWOOD static u32 cs_spi_mpp_back[2]; +#endif struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, unsigned int max_hz, unsigned int mode) { struct spi_slave *slave; u32 data; +#ifdef CONFIG_KIRKWOOD static const u32 kwspi_mpp_config[2][2] = { { MPP0_SPI_SCn, 0 }, /* if cs == 0 */ { MPP7_SPI_SCn, 0 } /* if cs != 0 */ }; +#endif if (!spi_cs_is_valid(bus, cs)) return NULL; @@ -46,20 +131,24 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, /* program spi clock prescaller using max_hz */ writel(KWSPI_ADRLEN_3BYTE | data, &spireg->cfg); - debug("data = 0x%08x \n", data); + debug("data = 0x%08x\n", data); writel(KWSPI_SMEMRDIRQ, &spireg->irq_cause); writel(KWSPI_IRQMASK, &spireg->irq_mask); +#ifdef CONFIG_KIRKWOOD /* program mpp registers to select SPI_CSn */ kirkwood_mpp_conf(kwspi_mpp_config[cs ? 1 : 0], cs_spi_mpp_back); +#endif return slave; } void spi_free_slave(struct spi_slave *slave) { +#ifdef CONFIG_KIRKWOOD kirkwood_mpp_conf(cs_spi_mpp_back, NULL); +#endif free(slave); } @@ -100,7 +189,6 @@ int spi_claim_bus(struct spi_slave *slave) /* set new spi mpp and save current mpp config */ kirkwood_mpp_conf(spi_mpp_config, spi_mpp_backup); - #endif return board_spi_claim_bus(slave); @@ -127,7 +215,7 @@ void spi_release_bus(struct spi_slave *slave) */ int spi_cs_is_valid(unsigned int bus, unsigned int cs) { - return (bus == 0 && (cs == 0 || cs == 1)); + return bus == 0 && (cs == 0 || cs == 1); } #endif @@ -137,77 +225,124 @@ void spi_init(void) void spi_cs_activate(struct spi_slave *slave) { - setbits_le32(&spireg->ctrl, KWSPI_CSN_ACT); + _spi_cs_activate(spireg); } void spi_cs_deactivate(struct spi_slave *slave) { - clrbits_le32(&spireg->ctrl, KWSPI_CSN_ACT); + _spi_cs_deactivate(spireg); } -int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, - void *din, unsigned long flags) +int spi_xfer(struct spi_slave *slave, unsigned int bitlen, + const void *dout, void *din, unsigned long flags) { - unsigned int tmpdout, tmpdin; - int tm, isread = 0; + return _spi_xfer(spireg, bitlen, dout, din, flags); +} - debug("spi_xfer: slave %u:%u dout %p din %p bitlen %u\n", - slave->bus, slave->cs, dout, din, bitlen); +#else - if (flags & SPI_XFER_BEGIN) - spi_cs_activate(slave); +/* Here now the DM part */ - /* - * handle data in 8-bit chunks - * TBD: 2byte xfer mode to be enabled - */ - clrsetbits_le32(&spireg->cfg, KWSPI_XFERLEN_MASK, KWSPI_XFERLEN_1BYTE); +struct mvebu_spi_platdata { + struct kwspi_registers *spireg; +}; - while (bitlen > 4) { - debug("loopstart bitlen %d\n", bitlen); - tmpdout = 0; +struct mvebu_spi_priv { + struct kwspi_registers *spireg; +}; - /* Shift data so it's msb-justified */ - if (dout) - tmpdout = *(u32 *) dout & 0x0ff; +static int mvebu_spi_set_speed(struct udevice *bus, uint hz) +{ + struct mvebu_spi_platdata *plat = dev_get_platdata(bus); + struct kwspi_registers *reg = plat->spireg; + u32 data; - clrbits_le32(&spireg->irq_cause, KWSPI_SMEMRDIRQ); - writel(tmpdout, &spireg->dout); /* Write the data out */ - debug("*** spi_xfer: ... %08x written, bitlen %d\n", - tmpdout, bitlen); + /* calculate spi clock prescaller using max_hz */ + data = ((CONFIG_SYS_TCLK / 2) / hz) + 0x10; + data = data < KWSPI_CLKPRESCL_MIN ? KWSPI_CLKPRESCL_MIN : data; + data = data > KWSPI_CLKPRESCL_MASK ? KWSPI_CLKPRESCL_MASK : data; - /* - * Wait for SPI transmit to get out - * or time out (1 second = 1000 ms) - * The NE event must be read and cleared first - */ - for (tm = 0, isread = 0; tm < KWSPI_TIMEOUT; ++tm) { - if (readl(&spireg->irq_cause) & KWSPI_SMEMRDIRQ) { - isread = 1; - tmpdin = readl(&spireg->din); - debug - ("spi_xfer: din %p..%08x read\n", - din, tmpdin); + /* program spi clock prescaler using max_hz */ + writel(KWSPI_ADRLEN_3BYTE | data, ®->cfg); + debug("data = 0x%08x\n", data); - if (din) { - *((u8 *) din) = (u8) tmpdin; - din += 1; - } - if (dout) - dout += 1; - bitlen -= 8; - } - if (isread) - break; - } - if (tm >= KWSPI_TIMEOUT) - printf("*** spi_xfer: Time out during SPI transfer\n"); + return 0; +} - debug("loopend bitlen %d\n", bitlen); - } +static int mvebu_spi_set_mode(struct udevice *bus, uint mode) +{ + return 0; +} - if (flags & SPI_XFER_END) - spi_cs_deactivate(slave); +static int mvebu_spi_xfer(struct udevice *dev, unsigned int bitlen, + const void *dout, void *din, unsigned long flags) +{ + struct udevice *bus = dev->parent; + struct mvebu_spi_platdata *plat = dev_get_platdata(bus); + + return _spi_xfer(plat->spireg, bitlen, dout, din, flags); +} + +static int mvebu_spi_claim_bus(struct udevice *dev) +{ + struct udevice *bus = dev->parent; + struct mvebu_spi_platdata *plat = dev_get_platdata(bus); + + /* Configure the chip-select in the CTRL register */ + clrsetbits_le32(&plat->spireg->ctrl, + KWSPI_CS_MASK << KWSPI_CS_SHIFT, + spi_chip_select(dev) << KWSPI_CS_SHIFT); return 0; } + +static int mvebu_spi_probe(struct udevice *bus) +{ + struct mvebu_spi_platdata *plat = dev_get_platdata(bus); + struct kwspi_registers *reg = plat->spireg; + + writel(KWSPI_SMEMRDY, ®->ctrl); + writel(KWSPI_SMEMRDIRQ, ®->irq_cause); + writel(KWSPI_IRQMASK, ®->irq_mask); + + return 0; +} + +static int mvebu_spi_ofdata_to_platdata(struct udevice *bus) +{ + struct mvebu_spi_platdata *plat = dev_get_platdata(bus); + + plat->spireg = (struct kwspi_registers *)dev_get_addr(bus); + + return 0; +} + +static const struct dm_spi_ops mvebu_spi_ops = { + .claim_bus = mvebu_spi_claim_bus, + .xfer = mvebu_spi_xfer, + .set_speed = mvebu_spi_set_speed, + .set_mode = mvebu_spi_set_mode, + /* + * cs_info is not needed, since we require all chip selects to be + * in the device tree explicitly + */ +}; + +static const struct udevice_id mvebu_spi_ids[] = { + { .compatible = "marvell,armada-375-spi" }, + { .compatible = "marvell,armada-380-spi" }, + { .compatible = "marvell,armada-xp-spi" }, + { } +}; + +U_BOOT_DRIVER(mvebu_spi) = { + .name = "mvebu_spi", + .id = UCLASS_SPI, + .of_match = mvebu_spi_ids, + .ops = &mvebu_spi_ops, + .ofdata_to_platdata = mvebu_spi_ofdata_to_platdata, + .platdata_auto_alloc_size = sizeof(struct mvebu_spi_platdata), + .priv_auto_alloc_size = sizeof(struct mvebu_spi_priv), + .probe = mvebu_spi_probe, +}; +#endif