--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Marvell International Ltd.
+ */
+
+#include <clk.h>
+#include <dm.h>
+#include <malloc.h>
+#include <spi.h>
+#include <spi-mem.h>
+#include <watchdog.h>
+#include <asm/io.h>
+#include <asm/unaligned.h>
+#include <linux/bitfield.h>
+#include <linux/compat.h>
+#include <linux/delay.h>
+
+#define OCTEON_SPI_MAX_BYTES 9
+#define OCTEON_SPI_MAX_CLOCK_HZ 50000000
+
+#define OCTEON_SPI_NUM_CS 4
+
+#define OCTEON_SPI_CS_VALID(cs) ((cs) < OCTEON_SPI_NUM_CS)
+
+#define MPI_CFG 0x0000
+#define MPI_STS 0x0008
+#define MPI_TX 0x0010
+#define MPI_XMIT 0x0018
+#define MPI_WIDE_DAT 0x0040
+#define MPI_IO_CTL 0x0048
+#define MPI_DAT(X) (0x0080 + ((X) << 3))
+#define MPI_WIDE_BUF(X) (0x0800 + ((X) << 3))
+#define MPI_CYA_CFG 0x1000
+#define MPI_CLKEN 0x1080
+
+#define MPI_CFG_ENABLE BIT_ULL(0)
+#define MPI_CFG_IDLELO BIT_ULL(1)
+#define MPI_CFG_CLK_CONT BIT_ULL(2)
+#define MPI_CFG_WIREOR BIT_ULL(3)
+#define MPI_CFG_LSBFIRST BIT_ULL(4)
+#define MPI_CFG_CS_STICKY BIT_ULL(5)
+#define MPI_CFG_CSHI BIT_ULL(7)
+#define MPI_CFG_IDLECLKS GENMASK_ULL(9, 8)
+#define MPI_CFG_TRITX BIT_ULL(10)
+#define MPI_CFG_CSLATE BIT_ULL(11)
+#define MPI_CFG_CSENA0 BIT_ULL(12)
+#define MPI_CFG_CSENA1 BIT_ULL(13)
+#define MPI_CFG_CSENA2 BIT_ULL(14)
+#define MPI_CFG_CSENA3 BIT_ULL(15)
+#define MPI_CFG_CLKDIV GENMASK_ULL(28, 16)
+#define MPI_CFG_LEGACY_DIS BIT_ULL(31)
+#define MPI_CFG_IOMODE GENMASK_ULL(35, 34)
+#define MPI_CFG_TB100_EN BIT_ULL(49)
+
+#define MPI_DAT_DATA GENMASK_ULL(7, 0)
+
+#define MPI_STS_BUSY BIT_ULL(0)
+#define MPI_STS_MPI_INTR BIT_ULL(1)
+#define MPI_STS_RXNUM GENMASK_ULL(12, 8)
+
+#define MPI_TX_TOTNUM GENMASK_ULL(4, 0)
+#define MPI_TX_TXNUM GENMASK_ULL(12, 8)
+#define MPI_TX_LEAVECS BIT_ULL(16)
+#define MPI_TX_CSID GENMASK_ULL(21, 20)
+
+#define MPI_XMIT_TOTNUM GENMASK_ULL(10, 0)
+#define MPI_XMIT_TXNUM GENMASK_ULL(30, 20)
+#define MPI_XMIT_BUF_SEL BIT_ULL(59)
+#define MPI_XMIT_LEAVECS BIT_ULL(60)
+#define MPI_XMIT_CSID GENMASK_ULL(62, 61)
+
+/* Used on Octeon TX2 */
+void board_acquire_flash_arb(bool acquire);
+
+/* Local driver data structure */
+struct octeon_spi {
+ void __iomem *base; /* Register base address */
+ struct clk clk;
+ u32 clkdiv; /* Clock divisor for device speed */
+};
+
+static u64 octeon_spi_set_mpicfg(struct udevice *dev)
+{
+ struct dm_spi_slave_platdata *slave = dev_get_parent_platdata(dev);
+ struct udevice *bus = dev_get_parent(dev);
+ struct octeon_spi *priv = dev_get_priv(bus);
+ u64 mpi_cfg;
+ uint max_speed = slave->max_hz;
+ bool cpha, cpol;
+
+ if (!max_speed)
+ max_speed = 12500000;
+ if (max_speed > OCTEON_SPI_MAX_CLOCK_HZ)
+ max_speed = OCTEON_SPI_MAX_CLOCK_HZ;
+
+ debug("\n slave params %d %d %d\n", slave->cs,
+ slave->max_hz, slave->mode);
+ cpha = !!(slave->mode & SPI_CPHA);
+ cpol = !!(slave->mode & SPI_CPOL);
+
+ mpi_cfg = FIELD_PREP(MPI_CFG_CLKDIV, priv->clkdiv & 0x1fff) |
+ FIELD_PREP(MPI_CFG_CSHI, !!(slave->mode & SPI_CS_HIGH)) |
+ FIELD_PREP(MPI_CFG_LSBFIRST, !!(slave->mode & SPI_LSB_FIRST)) |
+ FIELD_PREP(MPI_CFG_WIREOR, !!(slave->mode & SPI_3WIRE)) |
+ FIELD_PREP(MPI_CFG_IDLELO, cpha != cpol) |
+ FIELD_PREP(MPI_CFG_CSLATE, cpha) |
+ MPI_CFG_CSENA0 | MPI_CFG_CSENA1 |
+ MPI_CFG_CSENA2 | MPI_CFG_CSENA1 |
+ MPI_CFG_ENABLE;
+
+ debug("\n mpi_cfg %llx\n", mpi_cfg);
+ return mpi_cfg;
+}
+
+/**
+ * Wait until the SPI bus is ready
+ *
+ * @param dev SPI device to wait for
+ */
+static void octeon_spi_wait_ready(struct udevice *dev)
+{
+ struct udevice *bus = dev_get_parent(dev);
+ struct octeon_spi *priv = dev_get_priv(bus);
+ void *base = priv->base;
+ u64 mpi_sts;
+
+ do {
+ mpi_sts = readq(base + MPI_STS);
+ WATCHDOG_RESET();
+ } while (mpi_sts & MPI_STS_BUSY);
+
+ debug("%s(%s)\n", __func__, dev->name);
+}
+
+/**
+ * Claim the bus for a slave device
+ *
+ * @param dev SPI bus
+ *
+ * @return 0 for success, -EINVAL if chip select is invalid
+ */
+static int octeon_spi_claim_bus(struct udevice *dev)
+{
+ struct udevice *bus = dev_get_parent(dev);
+ struct octeon_spi *priv = dev_get_priv(bus);
+ void *base = priv->base;
+ u64 mpi_cfg;
+
+ debug("\n\n%s(%s)\n", __func__, dev->name);
+ if (!OCTEON_SPI_CS_VALID(spi_chip_select(dev)))
+ return -EINVAL;
+
+ if (IS_ENABLED(CONFIG_ARCH_OCTEONTX2))
+ board_acquire_flash_arb(true);
+
+ mpi_cfg = readq(base + MPI_CFG);
+ mpi_cfg &= ~MPI_CFG_TRITX;
+ mpi_cfg |= MPI_CFG_ENABLE;
+ writeq(mpi_cfg, base + MPI_CFG);
+ mpi_cfg = readq(base + MPI_CFG);
+ udelay(5); /** Wait for bus to settle */
+
+ return 0;
+}
+
+/**
+ * Release the bus to a slave device
+ *
+ * @param dev SPI bus
+ *
+ * @return 0 for success, -EINVAL if chip select is invalid
+ */
+static int octeon_spi_release_bus(struct udevice *dev)
+{
+ struct udevice *bus = dev_get_parent(dev);
+ struct octeon_spi *priv = dev_get_priv(bus);
+ void *base = priv->base;
+ u64 mpi_cfg;
+
+ debug("%s(%s)\n\n", __func__, dev->name);
+ if (!OCTEON_SPI_CS_VALID(spi_chip_select(dev)))
+ return -EINVAL;
+
+ if (IS_ENABLED(CONFIG_ARCH_OCTEONTX2))
+ board_acquire_flash_arb(false);
+
+ mpi_cfg = readq(base + MPI_CFG);
+ mpi_cfg &= ~MPI_CFG_ENABLE;
+ writeq(mpi_cfg, base + MPI_CFG);
+ mpi_cfg = readq(base + MPI_CFG);
+ udelay(1);
+
+ return 0;
+}
+
+static int octeon_spi_xfer(struct udevice *dev, unsigned int bitlen,
+ const void *dout, void *din, unsigned long flags)
+{
+ struct udevice *bus = dev_get_parent(dev);
+ struct octeon_spi *priv = dev_get_priv(bus);
+ void *base = priv->base;
+ u64 mpi_tx;
+ u64 mpi_cfg;
+ u64 wide_dat = 0;
+ int len = bitlen / 8;
+ int i;
+ const u8 *tx_data = dout;
+ u8 *rx_data = din;
+ int cs = spi_chip_select(dev);
+
+ if (!OCTEON_SPI_CS_VALID(cs))
+ return -EINVAL;
+
+ debug("\n %s(%s, %u, %p, %p, 0x%lx), cs: %d\n",
+ __func__, dev->name, bitlen, dout, din, flags, cs);
+
+ mpi_cfg = octeon_spi_set_mpicfg(dev);
+ if (mpi_cfg != readq(base + MPI_CFG)) {
+ writeq(mpi_cfg, base + MPI_CFG);
+ mpi_cfg = readq(base + MPI_CFG);
+ udelay(10);
+ }
+
+ debug("\n mpi_cfg upd %llx\n", mpi_cfg);
+
+ /*
+ * Start by writing and reading 8 bytes at a time. While we can support
+ * up to 10, it's easier to just use 8 with the MPI_WIDE_DAT register.
+ */
+ while (len > 8) {
+ if (tx_data) {
+ wide_dat = get_unaligned((u64 *)tx_data);
+ debug(" tx: %016llx \t", (unsigned long long)wide_dat);
+ tx_data += 8;
+ writeq(wide_dat, base + MPI_WIDE_DAT);
+ }
+
+ mpi_tx = FIELD_PREP(MPI_TX_CSID, cs) |
+ FIELD_PREP(MPI_TX_LEAVECS, 1) |
+ FIELD_PREP(MPI_TX_TXNUM, tx_data ? 8 : 0) |
+ FIELD_PREP(MPI_TX_TOTNUM, 8);
+ writeq(mpi_tx, base + MPI_TX);
+
+ octeon_spi_wait_ready(dev);
+
+ debug("\n ");
+
+ if (rx_data) {
+ wide_dat = readq(base + MPI_WIDE_DAT);
+ debug(" rx: %016llx\t", (unsigned long long)wide_dat);
+ *(u64 *)rx_data = wide_dat;
+ rx_data += 8;
+ }
+ len -= 8;
+ }
+
+ debug("\n ");
+
+ /* Write and read the rest of the data */
+ if (tx_data) {
+ for (i = 0; i < len; i++) {
+ debug(" tx: %02x\n", *tx_data);
+ writeq(*tx_data++, base + MPI_DAT(i));
+ }
+ }
+
+ mpi_tx = FIELD_PREP(MPI_TX_CSID, cs) |
+ FIELD_PREP(MPI_TX_LEAVECS, !(flags & SPI_XFER_END)) |
+ FIELD_PREP(MPI_TX_TXNUM, tx_data ? len : 0) |
+ FIELD_PREP(MPI_TX_TOTNUM, len);
+ writeq(mpi_tx, base + MPI_TX);
+
+ octeon_spi_wait_ready(dev);
+
+ debug("\n ");
+
+ if (rx_data) {
+ for (i = 0; i < len; i++) {
+ *rx_data = readq(base + MPI_DAT(i)) & 0xff;
+ debug(" rx: %02x\n", *rx_data);
+ rx_data++;
+ }
+ }
+
+ return 0;
+}
+
+static int octeontx2_spi_xfer(struct udevice *dev, unsigned int bitlen,
+ const void *dout, void *din, unsigned long flags)
+{
+ struct udevice *bus = dev_get_parent(dev);
+ struct octeon_spi *priv = dev_get_priv(bus);
+ void *base = priv->base;
+ u64 mpi_xmit;
+ u64 mpi_cfg;
+ u64 wide_dat = 0;
+ int len = bitlen / 8;
+ int rem;
+ int i;
+ const u8 *tx_data = dout;
+ u8 *rx_data = din;
+ int cs = spi_chip_select(dev);
+
+ if (!OCTEON_SPI_CS_VALID(cs))
+ return -EINVAL;
+
+ debug("\n %s(%s, %u, %p, %p, 0x%lx), cs: %d\n",
+ __func__, dev->name, bitlen, dout, din, flags, cs);
+
+ mpi_cfg = octeon_spi_set_mpicfg(dev);
+
+ mpi_cfg |= MPI_CFG_TRITX | MPI_CFG_LEGACY_DIS | MPI_CFG_CS_STICKY |
+ MPI_CFG_TB100_EN;
+
+ mpi_cfg &= ~MPI_CFG_IOMODE;
+ if (flags & (SPI_TX_DUAL | SPI_RX_DUAL))
+ mpi_cfg |= FIELD_PREP(MPI_CFG_IOMODE, 2);
+ if (flags & (SPI_TX_QUAD | SPI_RX_QUAD))
+ mpi_cfg |= FIELD_PREP(MPI_CFG_IOMODE, 3);
+
+ if (mpi_cfg != readq(base + MPI_CFG)) {
+ writeq(mpi_cfg, base + MPI_CFG);
+ mpi_cfg = readq(base + MPI_CFG);
+ udelay(10);
+ }
+
+ debug("\n mpi_cfg upd %llx\n\n", mpi_cfg);
+
+ /* Start by writing or reading 1024 bytes at a time. */
+ while (len > 1024) {
+ if (tx_data) {
+ /* 8 bytes per iteration */
+ for (i = 0; i < 128; i++) {
+ wide_dat = get_unaligned((u64 *)tx_data);
+ debug(" tx: %016llx \t",
+ (unsigned long long)wide_dat);
+ if ((i % 4) == 3)
+ debug("\n");
+ tx_data += 8;
+ writeq(wide_dat, base + MPI_WIDE_BUF(i));
+ }
+ }
+
+ mpi_xmit = FIELD_PREP(MPI_XMIT_CSID, cs) | MPI_XMIT_LEAVECS |
+ FIELD_PREP(MPI_XMIT_TXNUM, tx_data ? 1024 : 0) |
+ FIELD_PREP(MPI_XMIT_TOTNUM, 1024);
+ writeq(mpi_xmit, base + MPI_XMIT);
+
+ octeon_spi_wait_ready(dev);
+
+ debug("\n ");
+
+ if (rx_data) {
+ /* 8 bytes per iteration */
+ for (i = 0; i < 128; i++) {
+ wide_dat = readq(base + MPI_WIDE_BUF(i));
+ debug(" rx: %016llx\t",
+ (unsigned long long)wide_dat);
+ if ((i % 4) == 3)
+ debug("\n");
+ *(u64 *)rx_data = wide_dat;
+ rx_data += 8;
+ }
+ }
+ len -= 1024;
+ }
+
+ if (tx_data) {
+ rem = len % 8;
+ /* 8 bytes per iteration */
+ for (i = 0; i < len / 8; i++) {
+ wide_dat = get_unaligned((u64 *)tx_data);
+ debug(" tx: %016llx \t",
+ (unsigned long long)wide_dat);
+ if ((i % 4) == 3)
+ debug("\n");
+ tx_data += 8;
+ writeq(wide_dat, base + MPI_WIDE_BUF(i));
+ }
+ if (rem) {
+ memcpy(&wide_dat, tx_data, rem);
+ debug(" rtx: %016llx\t", wide_dat);
+ writeq(wide_dat, base + MPI_WIDE_BUF(i));
+ }
+ }
+
+ mpi_xmit = FIELD_PREP(MPI_XMIT_CSID, cs) |
+ FIELD_PREP(MPI_XMIT_LEAVECS, !(flags & SPI_XFER_END)) |
+ FIELD_PREP(MPI_XMIT_TXNUM, tx_data ? len : 0) |
+ FIELD_PREP(MPI_XMIT_TOTNUM, len);
+ writeq(mpi_xmit, base + MPI_XMIT);
+
+ octeon_spi_wait_ready(dev);
+
+ debug("\n ");
+
+ if (rx_data) {
+ rem = len % 8;
+ /* 8 bytes per iteration */
+ for (i = 0; i < len / 8; i++) {
+ wide_dat = readq(base + MPI_WIDE_BUF(i));
+ debug(" rx: %016llx\t",
+ (unsigned long long)wide_dat);
+ if ((i % 4) == 3)
+ debug("\n");
+ *(u64 *)rx_data = wide_dat;
+ rx_data += 8;
+ }
+ if (rem) {
+ wide_dat = readq(base + MPI_WIDE_BUF(i));
+ debug(" rrx: %016llx\t",
+ (unsigned long long)wide_dat);
+ memcpy(rx_data, &wide_dat, rem);
+ rx_data += rem;
+ }
+ }
+
+ return 0;
+}
+
+static bool octeon_spi_supports_op(struct spi_slave *slave,
+ const struct spi_mem_op *op)
+{
+ /* For now, support only below combinations
+ * 1-1-1
+ * 1-1-2 1-2-2
+ * 1-1-4 1-4-4
+ */
+ if (op->cmd.buswidth != 1)
+ return false;
+ return true;
+}
+
+static int octeon_spi_exec_op(struct spi_slave *slave,
+ const struct spi_mem_op *op)
+{
+ unsigned long flags = SPI_XFER_BEGIN;
+ const void *tx;
+ void *rx;
+ u8 opcode, *buf;
+ u8 *addr;
+ int i, temp, ret;
+
+ if (op->cmd.buswidth != 1)
+ return -ENOTSUPP;
+
+ /* Send CMD */
+ i = 0;
+ opcode = op->cmd.opcode;
+
+ if (!op->data.nbytes && !op->addr.nbytes && !op->dummy.nbytes)
+ flags |= SPI_XFER_END;
+
+ ret = octeontx2_spi_xfer(slave->dev, 8, (void *)&opcode, NULL, flags);
+ if (ret < 0)
+ return ret;
+
+ /* Send Address and dummy */
+ if (op->addr.nbytes) {
+ /* Alloc buffer for address+dummy */
+ buf = (u8 *)calloc(1, op->addr.nbytes + op->dummy.nbytes);
+ if (!buf) {
+ printf("%s Out of memory\n", __func__);
+ return -ENOMEM;
+ }
+ addr = (u8 *)&op->addr.val;
+ for (temp = 0; temp < op->addr.nbytes; temp++)
+ buf[i++] = *(u8 *)(addr + op->addr.nbytes - 1 - temp);
+ for (temp = 0; temp < op->dummy.nbytes; temp++)
+ buf[i++] = 0xff;
+ if (op->addr.buswidth == 2)
+ flags |= SPI_RX_DUAL;
+ if (op->addr.buswidth == 4)
+ flags |= SPI_RX_QUAD;
+
+ if (!op->data.nbytes)
+ flags |= SPI_XFER_END;
+ ret = octeontx2_spi_xfer(slave->dev, i * 8, (void *)buf, NULL,
+ flags);
+ free(buf);
+ if (ret < 0)
+ return ret;
+ }
+ if (!op->data.nbytes)
+ return 0;
+
+ /* Send/Receive Data */
+ flags |= SPI_XFER_END;
+ if (op->data.buswidth == 2)
+ flags |= SPI_RX_DUAL;
+ if (op->data.buswidth == 4)
+ flags |= SPI_RX_QUAD;
+
+ rx = (op->data.dir == SPI_MEM_DATA_IN) ? op->data.buf.in : NULL;
+ tx = (op->data.dir == SPI_MEM_DATA_OUT) ? op->data.buf.out : NULL;
+
+ ret = octeontx2_spi_xfer(slave->dev, (op->data.nbytes * 8), tx, rx,
+ flags);
+ return ret;
+}
+
+static const struct spi_controller_mem_ops octeontx2_spi_mem_ops = {
+ .supports_op = octeon_spi_supports_op,
+ .exec_op = octeon_spi_exec_op,
+};
+
+/**
+ * Set the speed of the SPI bus
+ *
+ * @param bus bus to set
+ * @param max_hz maximum speed supported
+ */
+static int octeon_spi_set_speed(struct udevice *bus, uint max_hz)
+{
+ struct octeon_spi *priv = dev_get_priv(bus);
+ ulong clk_rate;
+ u32 calc_hz;
+
+ if (max_hz > OCTEON_SPI_MAX_CLOCK_HZ)
+ max_hz = OCTEON_SPI_MAX_CLOCK_HZ;
+
+ clk_rate = clk_get_rate(&priv->clk);
+ if (IS_ERR_VALUE(clk_rate))
+ return -EINVAL;
+
+ debug("%s(%s, %u, %lu)\n", __func__, bus->name, max_hz, clk_rate);
+
+ priv->clkdiv = clk_rate / (2 * max_hz);
+ while (1) {
+ calc_hz = clk_rate / (2 * priv->clkdiv);
+ if (calc_hz <= max_hz)
+ break;
+ priv->clkdiv += 1;
+ }
+
+ if (priv->clkdiv > 8191)
+ return -EINVAL;
+
+ debug("%s: clkdiv=%d\n", __func__, priv->clkdiv);
+
+ return 0;
+}
+
+static int octeon_spi_set_mode(struct udevice *bus, uint mode)
+{
+ /* We don't set it here */
+ return 0;
+}
+
+static struct dm_spi_ops octeon_spi_ops = {
+ .claim_bus = octeon_spi_claim_bus,
+ .release_bus = octeon_spi_release_bus,
+ .set_speed = octeon_spi_set_speed,
+ .set_mode = octeon_spi_set_mode,
+ .xfer = octeon_spi_xfer,
+};
+
+static int octeon_spi_probe(struct udevice *dev)
+{
+ struct octeon_spi *priv = dev_get_priv(dev);
+ int ret;
+
+ /* Octeon TX & TX2 use PCI based probing */
+ if (device_is_compatible(dev, "cavium,thunder-8190-spi")) {
+ pci_dev_t bdf = dm_pci_get_bdf(dev);
+
+ debug("SPI PCI device: %x\n", bdf);
+ priv->base = dm_pci_map_bar(dev, PCI_BASE_ADDRESS_0,
+ PCI_REGION_MEM);
+ /* Add base offset */
+ priv->base += 0x1000;
+
+ /*
+ * Octeon TX2 needs a different xfer function and supports
+ * mem_ops
+ */
+ if (device_is_compatible(dev, "cavium,thunderx-spi")) {
+ octeon_spi_ops.xfer = octeontx2_spi_xfer;
+ octeon_spi_ops.mem_ops = &octeontx2_spi_mem_ops;
+ }
+ } else {
+ priv->base = dev_remap_addr(dev);
+ }
+
+ ret = clk_get_by_index(dev, 0, &priv->clk);
+ if (ret < 0)
+ return ret;
+
+ ret = clk_enable(&priv->clk);
+ if (ret)
+ return ret;
+
+ debug("SPI bus %s %d at %p\n", dev->name, dev->seq, priv->base);
+
+ return 0;
+}
+
+static const struct udevice_id octeon_spi_ids[] = {
+ /* MIPS Octeon */
+ { .compatible = "cavium,octeon-3010-spi" },
+ /* ARM Octeon TX / TX2 */
+ { .compatible = "cavium,thunder-8190-spi" },
+ { }
+};
+
+U_BOOT_DRIVER(octeon_spi) = {
+ .name = "spi_octeon",
+ .id = UCLASS_SPI,
+ .of_match = octeon_spi_ids,
+ .probe = octeon_spi_probe,
+ .priv_auto_alloc_size = sizeof(struct octeon_spi),
+ .ops = &octeon_spi_ops,
+};
projects / platform / kernel / u-boot.git / commitdiff