Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 201 insertions, 0 deletions

diff --git a/drivers/spi/spi-altera-dfl.c b/drivers/spi/spi-altera-dfl.c
new file mode 100644
index 000000000..596e181ae
--- /dev/null
+++ b/drivers/spi/spi-altera-dfl.c
@@ -0,0 +1,201 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// DFL bus driver for Altera SPI Master
+//
+// Copyright (C) 2020 Intel Corporation, Inc.
+//
+// Authors:
+//   Matthew Gerlach <matthew.gerlach@linux.intel.com>
+//
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/stddef.h>
+#include <linux/errno.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/bitfield.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/altera.h>
+#include <linux/dfl.h>
+
+#define FME_FEATURE_ID_MAX10_SPI	0xe
+#define FME_FEATURE_REV_MAX10_SPI_N5010	0x1
+
+#define SPI_CORE_PARAMETER      0x8
+#define SHIFT_MODE              BIT_ULL(1)
+#define SHIFT_MODE_MSB          0
+#define SHIFT_MODE_LSB          1
+#define DATA_WIDTH              GENMASK_ULL(7, 2)
+#define NUM_CHIPSELECT          GENMASK_ULL(13, 8)
+#define CLK_POLARITY            BIT_ULL(14)
+#define CLK_PHASE               BIT_ULL(15)
+#define PERIPHERAL_ID           GENMASK_ULL(47, 32)
+#define SPI_CLK                 GENMASK_ULL(31, 22)
+#define SPI_INDIRECT_ACC_OFST   0x10
+
+#define INDIRECT_ADDR           (SPI_INDIRECT_ACC_OFST+0x0)
+#define INDIRECT_WR             BIT_ULL(8)
+#define INDIRECT_RD             BIT_ULL(9)
+#define INDIRECT_RD_DATA        (SPI_INDIRECT_ACC_OFST+0x8)
+#define INDIRECT_DATA_MASK      GENMASK_ULL(31, 0)
+#define INDIRECT_DEBUG          BIT_ULL(32)
+#define INDIRECT_WR_DATA        (SPI_INDIRECT_ACC_OFST+0x10)
+#define INDIRECT_TIMEOUT        10000
+
+static int indirect_bus_reg_read(void *context, unsigned int reg,
+				 unsigned int *val)
+{
+	void __iomem *base = context;
+	int loops;
+	u64 v;
+
+	writeq((reg >> 2) | INDIRECT_RD, base + INDIRECT_ADDR);
+
+	loops = 0;
+	while ((readq(base + INDIRECT_ADDR) & INDIRECT_RD) &&
+	       (loops++ < INDIRECT_TIMEOUT))
+		cpu_relax();
+
+	if (loops >= INDIRECT_TIMEOUT) {
+		pr_err("%s timed out %d\n", __func__, loops);
+		return -ETIME;
+	}
+
+	v = readq(base + INDIRECT_RD_DATA);
+
+	*val = v & INDIRECT_DATA_MASK;
+
+	return 0;
+}
+
+static int indirect_bus_reg_write(void *context, unsigned int reg,
+				  unsigned int val)
+{
+	void __iomem *base = context;
+	int loops;
+
+	writeq(val, base + INDIRECT_WR_DATA);
+	writeq((reg >> 2) | INDIRECT_WR, base + INDIRECT_ADDR);
+
+	loops = 0;
+	while ((readq(base + INDIRECT_ADDR) & INDIRECT_WR) &&
+	       (loops++ < INDIRECT_TIMEOUT))
+		cpu_relax();
+
+	if (loops >= INDIRECT_TIMEOUT) {
+		pr_err("%s timed out %d\n", __func__, loops);
+		return -ETIME;
+	}
+	return 0;
+}
+
+static const struct regmap_config indirect_regbus_cfg = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+	.fast_io = true,
+	.max_register = 24,
+
+	.reg_write = indirect_bus_reg_write,
+	.reg_read = indirect_bus_reg_read,
+};
+
+static void config_spi_master(void __iomem *base, struct spi_master *master)
+{
+	u64 v;
+
+	v = readq(base + SPI_CORE_PARAMETER);
+
+	master->mode_bits = SPI_CS_HIGH;
+	if (FIELD_GET(CLK_POLARITY, v))
+		master->mode_bits |= SPI_CPOL;
+	if (FIELD_GET(CLK_PHASE, v))
+		master->mode_bits |= SPI_CPHA;
+
+	master->num_chipselect = FIELD_GET(NUM_CHIPSELECT, v);
+	master->bits_per_word_mask =
+		SPI_BPW_RANGE_MASK(1, FIELD_GET(DATA_WIDTH, v));
+}
+
+static int dfl_spi_altera_probe(struct dfl_device *dfl_dev)
+{
+	struct spi_board_info board_info = { 0 };
+	struct device *dev = &dfl_dev->dev;
+	struct spi_master *master;
+	struct altera_spi *hw;
+	void __iomem *base;
+	int err;
+
+	master = devm_spi_alloc_master(dev, sizeof(struct altera_spi));
+	if (!master)
+		return -ENOMEM;
+
+	master->bus_num = -1;
+
+	hw = spi_master_get_devdata(master);
+
+	hw->dev = dev;
+
+	base = devm_ioremap_resource(dev, &dfl_dev->mmio_res);
+
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	config_spi_master(base, master);
+	dev_dbg(dev, "%s cs %u bpm 0x%x mode 0x%x\n", __func__,
+		master->num_chipselect, master->bits_per_word_mask,
+		master->mode_bits);
+
+	hw->regmap = devm_regmap_init(dev, NULL, base, &indirect_regbus_cfg);
+	if (IS_ERR(hw->regmap))
+		return PTR_ERR(hw->regmap);
+
+	hw->irq = -EINVAL;
+
+	altera_spi_init_master(master);
+
+	err = devm_spi_register_master(dev, master);
+	if (err)
+		return dev_err_probe(dev, err, "%s failed to register spi master\n",
+				     __func__);
+
+	if (dfl_dev->revision == FME_FEATURE_REV_MAX10_SPI_N5010)
+		strscpy(board_info.modalias, "m10-n5010", SPI_NAME_SIZE);
+	else
+		strscpy(board_info.modalias, "m10-d5005", SPI_NAME_SIZE);
+
+	board_info.max_speed_hz = 12500000;
+	board_info.bus_num = 0;
+	board_info.chip_select = 0;
+
+	if (!spi_new_device(master, &board_info)) {
+		dev_err(dev, "%s failed to create SPI device: %s\n",
+			__func__, board_info.modalias);
+	}
+
+	return 0;
+}
+
+static const struct dfl_device_id dfl_spi_altera_ids[] = {
+	{ FME_ID, FME_FEATURE_ID_MAX10_SPI },
+	{ }
+};
+
+static struct dfl_driver dfl_spi_altera_driver = {
+	.drv	= {
+		.name       = "dfl-spi-altera",
+	},
+	.id_table = dfl_spi_altera_ids,
+	.probe   = dfl_spi_altera_probe,
+};
+
+module_dfl_driver(dfl_spi_altera_driver);
+
+MODULE_DEVICE_TABLE(dfl, dfl_spi_altera_ids);
+MODULE_DESCRIPTION("DFL spi altera driver");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");