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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * (C) Copyright 2009
- * Marvell Semiconductor <www.marvell.com>
- * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
- *
- * Derived from drivers/spi/mpc8xxx_spi.c
- */
- #include <common.h>
- #include <dm.h>
- #include <log.h>
- #include <malloc.h>
- #include <spi.h>
- #include <asm/io.h>
- #include <asm/arch/soc.h>
- #ifdef CONFIG_ARCH_KIRKWOOD
- #include <asm/arch/mpp.h>
- #endif
- #include <asm/arch-mvebu/spi.h>
- struct mvebu_spi_dev {
- bool is_errata_50mhz_ac;
- };
- struct mvebu_spi_platdata {
- struct kwspi_registers *spireg;
- bool is_errata_50mhz_ac;
- };
- struct mvebu_spi_priv {
- struct kwspi_registers *spireg;
- };
- 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);
- 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;
- }
- 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;
- /* 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;
- /* program spi clock prescaler using max_hz */
- writel(KWSPI_ADRLEN_3BYTE | data, ®->cfg);
- debug("data = 0x%08x\n", data);
- return 0;
- }
- static void mvebu_spi_50mhz_ac_timing_erratum(struct udevice *bus, uint mode)
- {
- struct mvebu_spi_platdata *plat = dev_get_platdata(bus);
- struct kwspi_registers *reg = plat->spireg;
- u32 data;
- /*
- * Erratum description: (Erratum NO. FE-9144572) The device
- * SPI interface supports frequencies of up to 50 MHz.
- * However, due to this erratum, when the device core clock is
- * 250 MHz and the SPI interfaces is configured for 50MHz SPI
- * clock and CPOL=CPHA=1 there might occur data corruption on
- * reads from the SPI device.
- * Erratum Workaround:
- * Work in one of the following configurations:
- * 1. Set CPOL=CPHA=0 in "SPI Interface Configuration
- * Register".
- * 2. Set TMISO_SAMPLE value to 0x2 in "SPI Timing Parameters 1
- * Register" before setting the interface.
- */
- data = readl(®->timing1);
- data &= ~KW_SPI_TMISO_SAMPLE_MASK;
- if (CONFIG_SYS_TCLK == 250000000 &&
- mode & SPI_CPOL &&
- mode & SPI_CPHA)
- data |= KW_SPI_TMISO_SAMPLE_2;
- else
- data |= KW_SPI_TMISO_SAMPLE_1;
- writel(data, ®->timing1);
- }
- static int mvebu_spi_set_mode(struct udevice *bus, uint mode)
- {
- struct mvebu_spi_platdata *plat = dev_get_platdata(bus);
- struct kwspi_registers *reg = plat->spireg;
- u32 data = readl(®->cfg);
- data &= ~(KWSPI_CPHA | KWSPI_CPOL | KWSPI_RXLSBF | KWSPI_TXLSBF);
- if (mode & SPI_CPHA)
- data |= KWSPI_CPHA;
- if (mode & SPI_CPOL)
- data |= KWSPI_CPOL;
- if (mode & SPI_LSB_FIRST)
- data |= (KWSPI_RXLSBF | KWSPI_TXLSBF);
- writel(data, ®->cfg);
- if (plat->is_errata_50mhz_ac)
- mvebu_spi_50mhz_ac_timing_erratum(bus, mode);
- return 0;
- }
- 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);
- }
- __attribute__((weak)) int mvebu_board_spi_claim_bus(struct udevice *dev)
- {
- return 0;
- }
- 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 mvebu_board_spi_claim_bus(dev);
- }
- __attribute__((weak)) int mvebu_board_spi_release_bus(struct udevice *dev)
- {
- return 0;
- }
- static int mvebu_spi_release_bus(struct udevice *dev)
- {
- return mvebu_board_spi_release_bus(dev);
- }
- 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);
- const struct mvebu_spi_dev *drvdata =
- (struct mvebu_spi_dev *)dev_get_driver_data(bus);
- plat->spireg = dev_read_addr_ptr(bus);
- plat->is_errata_50mhz_ac = drvdata->is_errata_50mhz_ac;
- return 0;
- }
- static const struct dm_spi_ops mvebu_spi_ops = {
- .claim_bus = mvebu_spi_claim_bus,
- .release_bus = mvebu_spi_release_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 mvebu_spi_dev armada_spi_dev_data = {
- .is_errata_50mhz_ac = false,
- };
- static const struct mvebu_spi_dev armada_xp_spi_dev_data = {
- .is_errata_50mhz_ac = false,
- };
- static const struct mvebu_spi_dev armada_375_spi_dev_data = {
- .is_errata_50mhz_ac = false,
- };
- static const struct mvebu_spi_dev armada_380_spi_dev_data = {
- .is_errata_50mhz_ac = true,
- };
- static const struct udevice_id mvebu_spi_ids[] = {
- {
- .compatible = "marvell,orion-spi",
- .data = (ulong)&armada_spi_dev_data,
- },
- {
- .compatible = "marvell,armada-375-spi",
- .data = (ulong)&armada_375_spi_dev_data
- },
- {
- .compatible = "marvell,armada-380-spi",
- .data = (ulong)&armada_380_spi_dev_data
- },
- {
- .compatible = "marvell,armada-xp-spi",
- .data = (ulong)&armada_xp_spi_dev_data
- },
- { }
- };
- 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,
- };
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