Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 309 insertions, 0 deletions

diff --git a/drivers/spi/spi-sh-hspi.c b/drivers/spi/spi-sh-hspi.c
new file mode 100644
index 000000000..a62034e2a
--- /dev/null
+++ b/drivers/spi/spi-sh-hspi.c
@@ -0,0 +1,309 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * SuperH HSPI bus driver
+ *
+ * Copyright (C) 2011  Kuninori Morimoto
+ *
+ * Based on spi-sh.c:
+ * Based on pxa2xx_spi.c:
+ * Copyright (C) 2011 Renesas Solutions Corp.
+ * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/delay.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/io.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/sh_hspi.h>
+
+#define SPCR	0x00
+#define SPSR	0x04
+#define SPSCR	0x08
+#define SPTBR	0x0C
+#define SPRBR	0x10
+#define SPCR2	0x14
+
+/* SPSR */
+#define RXFL	(1 << 2)
+
+struct hspi_priv {
+	void __iomem *addr;
+	struct spi_controller *ctlr;
+	struct device *dev;
+	struct clk *clk;
+};
+
+/*
+ *		basic function
+ */
+static void hspi_write(struct hspi_priv *hspi, int reg, u32 val)
+{
+	iowrite32(val, hspi->addr + reg);
+}
+
+static u32 hspi_read(struct hspi_priv *hspi, int reg)
+{
+	return ioread32(hspi->addr + reg);
+}
+
+static void hspi_bit_set(struct hspi_priv *hspi, int reg, u32 mask, u32 set)
+{
+	u32 val = hspi_read(hspi, reg);
+
+	val &= ~mask;
+	val |= set & mask;
+
+	hspi_write(hspi, reg, val);
+}
+
+/*
+ *		transfer function
+ */
+static int hspi_status_check_timeout(struct hspi_priv *hspi, u32 mask, u32 val)
+{
+	int t = 256;
+
+	while (t--) {
+		if ((mask & hspi_read(hspi, SPSR)) == val)
+			return 0;
+
+		udelay(10);
+	}
+
+	dev_err(hspi->dev, "timeout\n");
+	return -ETIMEDOUT;
+}
+
+/*
+ *		spi master function
+ */
+
+#define hspi_hw_cs_enable(hspi)		hspi_hw_cs_ctrl(hspi, 0)
+#define hspi_hw_cs_disable(hspi)	hspi_hw_cs_ctrl(hspi, 1)
+static void hspi_hw_cs_ctrl(struct hspi_priv *hspi, int hi)
+{
+	hspi_bit_set(hspi, SPSCR, (1 << 6), (hi) << 6);
+}
+
+static void hspi_hw_setup(struct hspi_priv *hspi,
+			  struct spi_message *msg,
+			  struct spi_transfer *t)
+{
+	struct spi_device *spi = msg->spi;
+	struct device *dev = hspi->dev;
+	u32 spcr, idiv_clk;
+	u32 rate, best_rate, min, tmp;
+
+	/*
+	 * find best IDIV/CLKCx settings
+	 */
+	min = ~0;
+	best_rate = 0;
+	spcr = 0;
+	for (idiv_clk = 0x00; idiv_clk <= 0x3F; idiv_clk++) {
+		rate = clk_get_rate(hspi->clk);
+
+		/* IDIV calculation */
+		if (idiv_clk & (1 << 5))
+			rate /= 128;
+		else
+			rate /= 16;
+
+		/* CLKCx calculation */
+		rate /= (((idiv_clk & 0x1F) + 1) * 2);
+
+		/* save best settings */
+		tmp = abs(t->speed_hz - rate);
+		if (tmp < min) {
+			min = tmp;
+			spcr = idiv_clk;
+			best_rate = rate;
+		}
+	}
+
+	if (spi->mode & SPI_CPHA)
+		spcr |= 1 << 7;
+	if (spi->mode & SPI_CPOL)
+		spcr |= 1 << 6;
+
+	dev_dbg(dev, "speed %d/%d\n", t->speed_hz, best_rate);
+
+	hspi_write(hspi, SPCR, spcr);
+	hspi_write(hspi, SPSR, 0x0);
+	hspi_write(hspi, SPSCR, 0x21);	/* master mode / CS control */
+}
+
+static int hspi_transfer_one_message(struct spi_controller *ctlr,
+				     struct spi_message *msg)
+{
+	struct hspi_priv *hspi = spi_controller_get_devdata(ctlr);
+	struct spi_transfer *t;
+	u32 tx;
+	u32 rx;
+	int ret, i;
+	unsigned int cs_change;
+	const int nsecs = 50;
+
+	dev_dbg(hspi->dev, "%s\n", __func__);
+
+	cs_change = 1;
+	ret = 0;
+	list_for_each_entry(t, &msg->transfers, transfer_list) {
+
+		if (cs_change) {
+			hspi_hw_setup(hspi, msg, t);
+			hspi_hw_cs_enable(hspi);
+			ndelay(nsecs);
+		}
+		cs_change = t->cs_change;
+
+		for (i = 0; i < t->len; i++) {
+
+			/* wait remains */
+			ret = hspi_status_check_timeout(hspi, 0x1, 0);
+			if (ret < 0)
+				break;
+
+			tx = 0;
+			if (t->tx_buf)
+				tx = (u32)((u8 *)t->tx_buf)[i];
+
+			hspi_write(hspi, SPTBR, tx);
+
+			/* wait receive */
+			ret = hspi_status_check_timeout(hspi, 0x4, 0x4);
+			if (ret < 0)
+				break;
+
+			rx = hspi_read(hspi, SPRBR);
+			if (t->rx_buf)
+				((u8 *)t->rx_buf)[i] = (u8)rx;
+
+		}
+
+		msg->actual_length += t->len;
+
+		spi_transfer_delay_exec(t);
+
+		if (cs_change) {
+			ndelay(nsecs);
+			hspi_hw_cs_disable(hspi);
+			ndelay(nsecs);
+		}
+	}
+
+	msg->status = ret;
+	if (!cs_change) {
+		ndelay(nsecs);
+		hspi_hw_cs_disable(hspi);
+	}
+	spi_finalize_current_message(ctlr);
+
+	return ret;
+}
+
+static int hspi_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct spi_controller *ctlr;
+	struct hspi_priv *hspi;
+	struct clk *clk;
+	int ret;
+
+	/* get base addr */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "invalid resource\n");
+		return -EINVAL;
+	}
+
+	ctlr = spi_alloc_master(&pdev->dev, sizeof(*hspi));
+	if (!ctlr)
+		return -ENOMEM;
+
+	clk = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(clk)) {
+		dev_err(&pdev->dev, "couldn't get clock\n");
+		ret = -EINVAL;
+		goto error0;
+	}
+
+	hspi = spi_controller_get_devdata(ctlr);
+	platform_set_drvdata(pdev, hspi);
+
+	/* init hspi */
+	hspi->ctlr	= ctlr;
+	hspi->dev	= &pdev->dev;
+	hspi->clk	= clk;
+	hspi->addr	= devm_ioremap(hspi->dev,
+				       res->start, resource_size(res));
+	if (!hspi->addr) {
+		ret = -ENOMEM;
+		goto error1;
+	}
+
+	pm_runtime_enable(&pdev->dev);
+
+	ctlr->bus_num = pdev->id;
+	ctlr->mode_bits	= SPI_CPOL | SPI_CPHA;
+	ctlr->dev.of_node = pdev->dev.of_node;
+	ctlr->auto_runtime_pm = true;
+	ctlr->transfer_one_message = hspi_transfer_one_message;
+	ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
+
+	ret = devm_spi_register_controller(&pdev->dev, ctlr);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "devm_spi_register_controller error.\n");
+		goto error2;
+	}
+
+	return 0;
+
+ error2:
+	pm_runtime_disable(&pdev->dev);
+ error1:
+	clk_put(clk);
+ error0:
+	spi_controller_put(ctlr);
+
+	return ret;
+}
+
+static int hspi_remove(struct platform_device *pdev)
+{
+	struct hspi_priv *hspi = platform_get_drvdata(pdev);
+
+	pm_runtime_disable(&pdev->dev);
+
+	clk_put(hspi->clk);
+
+	return 0;
+}
+
+static const struct of_device_id hspi_of_match[] = {
+	{ .compatible = "renesas,hspi", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, hspi_of_match);
+
+static struct platform_driver hspi_driver = {
+	.probe = hspi_probe,
+	.remove = hspi_remove,
+	.driver = {
+		.name = "sh-hspi",
+		.of_match_table = hspi_of_match,
+	},
+};
+module_platform_driver(hspi_driver);
+
+MODULE_DESCRIPTION("SuperH HSPI bus driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
+MODULE_ALIAS("platform:sh-hspi");