v4.19.13 snapshot.
diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c
new file mode 100644
index 0000000..e80f60e
--- /dev/null
+++ b/drivers/spi/spi-dw-mmio.c
@@ -0,0 +1,232 @@
+/*
+ * Memory-mapped interface driver for DW SPI Core
+ *
+ * Copyright (c) 2010, Octasic semiconductor.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spi/spi.h>
+#include <linux/scatterlist.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+
+#include "spi-dw.h"
+
+#define DRIVER_NAME "dw_spi_mmio"
+
+struct dw_spi_mmio {
+ struct dw_spi dws;
+ struct clk *clk;
+ void *priv;
+};
+
+#define MSCC_CPU_SYSTEM_CTRL_GENERAL_CTRL 0x24
+#define OCELOT_IF_SI_OWNER_MASK GENMASK(5, 4)
+#define OCELOT_IF_SI_OWNER_OFFSET 4
+#define MSCC_IF_SI_OWNER_SISL 0
+#define MSCC_IF_SI_OWNER_SIBM 1
+#define MSCC_IF_SI_OWNER_SIMC 2
+
+#define MSCC_SPI_MST_SW_MODE 0x14
+#define MSCC_SPI_MST_SW_MODE_SW_PIN_CTRL_MODE BIT(13)
+#define MSCC_SPI_MST_SW_MODE_SW_SPI_CS(x) (x << 5)
+
+struct dw_spi_mscc {
+ struct regmap *syscon;
+ void __iomem *spi_mst;
+};
+
+/*
+ * The Designware SPI controller (referred to as master in the documentation)
+ * automatically deasserts chip select when the tx fifo is empty. The chip
+ * selects then needs to be either driven as GPIOs or, for the first 4 using the
+ * the SPI boot controller registers. the final chip select is an OR gate
+ * between the Designware SPI controller and the SPI boot controller.
+ */
+static void dw_spi_mscc_set_cs(struct spi_device *spi, bool enable)
+{
+ struct dw_spi *dws = spi_master_get_devdata(spi->master);
+ struct dw_spi_mmio *dwsmmio = container_of(dws, struct dw_spi_mmio, dws);
+ struct dw_spi_mscc *dwsmscc = dwsmmio->priv;
+ u32 cs = spi->chip_select;
+
+ if (cs < 4) {
+ u32 sw_mode = MSCC_SPI_MST_SW_MODE_SW_PIN_CTRL_MODE;
+
+ if (!enable)
+ sw_mode |= MSCC_SPI_MST_SW_MODE_SW_SPI_CS(BIT(cs));
+
+ writel(sw_mode, dwsmscc->spi_mst + MSCC_SPI_MST_SW_MODE);
+ }
+
+ dw_spi_set_cs(spi, enable);
+}
+
+static int dw_spi_mscc_init(struct platform_device *pdev,
+ struct dw_spi_mmio *dwsmmio)
+{
+ struct dw_spi_mscc *dwsmscc;
+ struct resource *res;
+
+ dwsmscc = devm_kzalloc(&pdev->dev, sizeof(*dwsmscc), GFP_KERNEL);
+ if (!dwsmscc)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ dwsmscc->spi_mst = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(dwsmscc->spi_mst)) {
+ dev_err(&pdev->dev, "SPI_MST region map failed\n");
+ return PTR_ERR(dwsmscc->spi_mst);
+ }
+
+ dwsmscc->syscon = syscon_regmap_lookup_by_compatible("mscc,ocelot-cpu-syscon");
+ if (IS_ERR(dwsmscc->syscon))
+ return PTR_ERR(dwsmscc->syscon);
+
+ /* Deassert all CS */
+ writel(0, dwsmscc->spi_mst + MSCC_SPI_MST_SW_MODE);
+
+ /* Select the owner of the SI interface */
+ regmap_update_bits(dwsmscc->syscon, MSCC_CPU_SYSTEM_CTRL_GENERAL_CTRL,
+ OCELOT_IF_SI_OWNER_MASK,
+ MSCC_IF_SI_OWNER_SIMC << OCELOT_IF_SI_OWNER_OFFSET);
+
+ dwsmmio->dws.set_cs = dw_spi_mscc_set_cs;
+ dwsmmio->priv = dwsmscc;
+
+ return 0;
+}
+
+static int dw_spi_mmio_probe(struct platform_device *pdev)
+{
+ int (*init_func)(struct platform_device *pdev,
+ struct dw_spi_mmio *dwsmmio);
+ struct dw_spi_mmio *dwsmmio;
+ struct dw_spi *dws;
+ struct resource *mem;
+ int ret;
+ int num_cs;
+
+ dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio),
+ GFP_KERNEL);
+ if (!dwsmmio)
+ return -ENOMEM;
+
+ dws = &dwsmmio->dws;
+
+ /* Get basic io resource and map it */
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dws->regs = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(dws->regs)) {
+ dev_err(&pdev->dev, "SPI region map failed\n");
+ return PTR_ERR(dws->regs);
+ }
+
+ dws->irq = platform_get_irq(pdev, 0);
+ if (dws->irq < 0) {
+ dev_err(&pdev->dev, "no irq resource?\n");
+ return dws->irq; /* -ENXIO */
+ }
+
+ dwsmmio->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(dwsmmio->clk))
+ return PTR_ERR(dwsmmio->clk);
+ ret = clk_prepare_enable(dwsmmio->clk);
+ if (ret)
+ return ret;
+
+ dws->bus_num = pdev->id;
+
+ dws->max_freq = clk_get_rate(dwsmmio->clk);
+
+ device_property_read_u32(&pdev->dev, "reg-io-width", &dws->reg_io_width);
+
+ num_cs = 4;
+
+ device_property_read_u32(&pdev->dev, "num-cs", &num_cs);
+
+ dws->num_cs = num_cs;
+
+ if (pdev->dev.of_node) {
+ int i;
+
+ for (i = 0; i < dws->num_cs; i++) {
+ int cs_gpio = of_get_named_gpio(pdev->dev.of_node,
+ "cs-gpios", i);
+
+ if (cs_gpio == -EPROBE_DEFER) {
+ ret = cs_gpio;
+ goto out;
+ }
+
+ if (gpio_is_valid(cs_gpio)) {
+ ret = devm_gpio_request(&pdev->dev, cs_gpio,
+ dev_name(&pdev->dev));
+ if (ret)
+ goto out;
+ }
+ }
+ }
+
+ init_func = device_get_match_data(&pdev->dev);
+ if (init_func) {
+ ret = init_func(pdev, dwsmmio);
+ if (ret)
+ goto out;
+ }
+
+ ret = dw_spi_add_host(&pdev->dev, dws);
+ if (ret)
+ goto out;
+
+ platform_set_drvdata(pdev, dwsmmio);
+ return 0;
+
+out:
+ clk_disable_unprepare(dwsmmio->clk);
+ return ret;
+}
+
+static int dw_spi_mmio_remove(struct platform_device *pdev)
+{
+ struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
+
+ dw_spi_remove_host(&dwsmmio->dws);
+ clk_disable_unprepare(dwsmmio->clk);
+
+ return 0;
+}
+
+static const struct of_device_id dw_spi_mmio_of_match[] = {
+ { .compatible = "snps,dw-apb-ssi", },
+ { .compatible = "mscc,ocelot-spi", .data = dw_spi_mscc_init},
+ { /* end of table */}
+};
+MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);
+
+static struct platform_driver dw_spi_mmio_driver = {
+ .probe = dw_spi_mmio_probe,
+ .remove = dw_spi_mmio_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .of_match_table = dw_spi_mmio_of_match,
+ },
+};
+module_platform_driver(dw_spi_mmio_driver);
+
+MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>");
+MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core");
+MODULE_LICENSE("GPL v2");