1 files changed, 240 insertions, 0 deletions

diff --git a/drivers/firmware/tegra/bpmp-tegra210.c b/drivers/firmware/tegra/bpmp-tegra210.c
new file mode 100644
index 000000000..c9c830f65
--- /dev/null
+++ b/drivers/firmware/tegra/bpmp-tegra210.c
@@ -0,0 +1,240 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+#include <soc/tegra/bpmp.h>
+
+#include "bpmp-private.h"
+
+#define TRIGGER_OFFSET		0x000
+#define RESULT_OFFSET(id)	(0xc00 + id * 4)
+#define TRIGGER_ID_SHIFT	16
+#define TRIGGER_CMD_GET		4
+
+#define STA_OFFSET		0
+#define SET_OFFSET		4
+#define CLR_OFFSET		8
+
+#define CH_MASK(ch)	(0x3 << ((ch) * 2))
+#define SL_SIGL(ch)	(0x0 << ((ch) * 2))
+#define SL_QUED(ch)	(0x1 << ((ch) * 2))
+#define MA_FREE(ch)	(0x2 << ((ch) * 2))
+#define MA_ACKD(ch)	(0x3 << ((ch) * 2))
+
+struct tegra210_bpmp {
+	void __iomem *atomics;
+	void __iomem *arb_sema;
+	struct irq_data *tx_irq_data;
+};
+
+static u32 bpmp_channel_status(struct tegra_bpmp *bpmp, unsigned int index)
+{
+	struct tegra210_bpmp *priv = bpmp->priv;
+
+	return __raw_readl(priv->arb_sema + STA_OFFSET) & CH_MASK(index);
+}
+
+static bool tegra210_bpmp_is_response_ready(struct tegra_bpmp_channel *channel)
+{
+	unsigned int index = channel->index;
+
+	return bpmp_channel_status(channel->bpmp, index) == MA_ACKD(index);
+}
+
+static bool tegra210_bpmp_is_request_ready(struct tegra_bpmp_channel *channel)
+{
+	unsigned int index = channel->index;
+
+	return bpmp_channel_status(channel->bpmp, index) == SL_SIGL(index);
+}
+
+static bool
+tegra210_bpmp_is_request_channel_free(struct tegra_bpmp_channel *channel)
+{
+	unsigned int index = channel->index;
+
+	return bpmp_channel_status(channel->bpmp, index) == MA_FREE(index);
+}
+
+static bool
+tegra210_bpmp_is_response_channel_free(struct tegra_bpmp_channel *channel)
+{
+	unsigned int index = channel->index;
+
+	return bpmp_channel_status(channel->bpmp, index) == SL_QUED(index);
+}
+
+static int tegra210_bpmp_post_request(struct tegra_bpmp_channel *channel)
+{
+	struct tegra210_bpmp *priv = channel->bpmp->priv;
+
+	__raw_writel(CH_MASK(channel->index), priv->arb_sema + CLR_OFFSET);
+
+	return 0;
+}
+
+static int tegra210_bpmp_post_response(struct tegra_bpmp_channel *channel)
+{
+	struct tegra210_bpmp *priv = channel->bpmp->priv;
+
+	__raw_writel(MA_ACKD(channel->index), priv->arb_sema + SET_OFFSET);
+
+	return 0;
+}
+
+static int tegra210_bpmp_ack_response(struct tegra_bpmp_channel *channel)
+{
+	struct tegra210_bpmp *priv = channel->bpmp->priv;
+
+	__raw_writel(MA_ACKD(channel->index) ^ MA_FREE(channel->index),
+		     priv->arb_sema + CLR_OFFSET);
+
+	return 0;
+}
+
+static int tegra210_bpmp_ack_request(struct tegra_bpmp_channel *channel)
+{
+	struct tegra210_bpmp *priv = channel->bpmp->priv;
+
+	__raw_writel(SL_QUED(channel->index), priv->arb_sema + SET_OFFSET);
+
+	return 0;
+}
+
+static int tegra210_bpmp_ring_doorbell(struct tegra_bpmp *bpmp)
+{
+	struct tegra210_bpmp *priv = bpmp->priv;
+	struct irq_data *irq_data = priv->tx_irq_data;
+
+	/*
+	 * Tegra Legacy Interrupt Controller (LIC) is used to notify BPMP of
+	 * available messages
+	 */
+	if (irq_data->chip->irq_retrigger)
+		return irq_data->chip->irq_retrigger(irq_data);
+
+	return -EINVAL;
+}
+
+static irqreturn_t rx_irq(int irq, void *data)
+{
+	struct tegra_bpmp *bpmp = data;
+
+	tegra_bpmp_handle_rx(bpmp);
+
+	return IRQ_HANDLED;
+}
+
+static int tegra210_bpmp_channel_init(struct tegra_bpmp_channel *channel,
+				      struct tegra_bpmp *bpmp,
+				      unsigned int index)
+{
+	struct tegra210_bpmp *priv = bpmp->priv;
+	u32 address;
+	void *p;
+
+	/* Retrieve channel base address from BPMP */
+	writel(index << TRIGGER_ID_SHIFT | TRIGGER_CMD_GET,
+	       priv->atomics + TRIGGER_OFFSET);
+	address = readl(priv->atomics + RESULT_OFFSET(index));
+
+	p = devm_ioremap(bpmp->dev, address, 0x80);
+	if (!p)
+		return -ENOMEM;
+
+	channel->ib = p;
+	channel->ob = p;
+	channel->index = index;
+	init_completion(&channel->completion);
+	channel->bpmp = bpmp;
+
+	return 0;
+}
+
+static int tegra210_bpmp_init(struct tegra_bpmp *bpmp)
+{
+	struct platform_device *pdev = to_platform_device(bpmp->dev);
+	struct tegra210_bpmp *priv;
+	unsigned int i;
+	int err;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	bpmp->priv = priv;
+
+	priv->atomics = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->atomics))
+		return PTR_ERR(priv->atomics);
+
+	priv->arb_sema = devm_platform_ioremap_resource(pdev, 1);
+	if (IS_ERR(priv->arb_sema))
+		return PTR_ERR(priv->arb_sema);
+
+	err = tegra210_bpmp_channel_init(bpmp->tx_channel, bpmp,
+					 bpmp->soc->channels.cpu_tx.offset);
+	if (err < 0)
+		return err;
+
+	err = tegra210_bpmp_channel_init(bpmp->rx_channel, bpmp,
+					 bpmp->soc->channels.cpu_rx.offset);
+	if (err < 0)
+		return err;
+
+	for (i = 0; i < bpmp->threaded.count; i++) {
+		unsigned int index = bpmp->soc->channels.thread.offset + i;
+
+		err = tegra210_bpmp_channel_init(&bpmp->threaded_channels[i],
+						 bpmp, index);
+		if (err < 0)
+			return err;
+	}
+
+	err = platform_get_irq_byname(pdev, "tx");
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to get TX IRQ: %d\n", err);
+		return err;
+	}
+
+	priv->tx_irq_data = irq_get_irq_data(err);
+	if (!priv->tx_irq_data) {
+		dev_err(&pdev->dev, "failed to get IRQ data for TX IRQ\n");
+		return -ENOENT;
+	}
+
+	err = platform_get_irq_byname(pdev, "rx");
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to get rx IRQ: %d\n", err);
+		return err;
+	}
+
+	err = devm_request_irq(&pdev->dev, err, rx_irq,
+			       IRQF_NO_SUSPEND, dev_name(&pdev->dev), bpmp);
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to request IRQ: %d\n", err);
+		return err;
+	}
+
+	return 0;
+}
+
+const struct tegra_bpmp_ops tegra210_bpmp_ops = {
+	.init = tegra210_bpmp_init,
+	.is_response_ready = tegra210_bpmp_is_response_ready,
+	.is_request_ready = tegra210_bpmp_is_request_ready,
+	.ack_response = tegra210_bpmp_ack_response,
+	.ack_request = tegra210_bpmp_ack_request,
+	.is_response_channel_free = tegra210_bpmp_is_response_channel_free,
+	.is_request_channel_free = tegra210_bpmp_is_request_channel_free,
+	.post_response = tegra210_bpmp_post_response,
+	.post_request = tegra210_bpmp_post_request,
+	.ring_doorbell = tegra210_bpmp_ring_doorbell,
+};