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From:   Peter De Schrijver <pdeschrijver@nvidia.com>
To:     Peter De Schrijver <pdeschrijver@nvidia.com>,
        <thierry.reding@gmail.com>, <jonathanh@nvidia.com>,
        <mperttunen@nvidia.com>
CC:     <sudeep.holla@arm.com>, <talho@nvidia.com>, <robh@kernel.org>,
        <linux-tegra@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <stefank@nvidia.com>
Subject: [PATCH 5/5] firmware: tegra: bpmp: Add support for DRAM MRQ GSCs
Date:   Mon, 8 May 2023 15:20:54 +0300
Message-ID: <20230508122048.99953-6-pdeschrijver@nvidia.com>
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Implement support for DRAM MRQ GSCs.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
---
 drivers/firmware/tegra/bpmp-tegra186.c | 208 ++++++++++++++++++-------
 drivers/firmware/tegra/bpmp.c          |   4 +-
 2 files changed, 150 insertions(+), 62 deletions(-)

diff --git a/drivers/firmware/tegra/bpmp-tegra186.c b/drivers/firmware/tegra/bpmp-tegra186.c
index 2e26199041cd..000acf0fe183 100644
--- a/drivers/firmware/tegra/bpmp-tegra186.c
+++ b/drivers/firmware/tegra/bpmp-tegra186.c
@@ -4,8 +4,11 @@
  */
 
 #include <linux/genalloc.h>
+#include <linux/io.h>
 #include <linux/mailbox_client.h>
+#include <linux/of_address.h>
 #include <linux/platform_device.h>
+#include <linux/range.h>
 
 #include <soc/tegra/bpmp.h>
 #include <soc/tegra/bpmp-abi.h>
@@ -13,11 +16,12 @@
 
 #include "bpmp-private.h"
 
+enum tegra_bpmp_mem_type { TEGRA_INVALID, TEGRA_SRAM, TEGRA_RMEM };
+
 struct tegra186_bpmp {
 	struct tegra_bpmp *parent;
 
 	struct {
-		struct gen_pool *pool;
 		void __iomem *virt;
 		dma_addr_t phys;
 	} tx, rx;
@@ -26,6 +30,12 @@ struct tegra186_bpmp {
 		struct mbox_client client;
 		struct mbox_chan *channel;
 	} mbox;
+
+	struct {
+		struct gen_pool *tx, *rx;
+	} sram;
+
+	enum tegra_bpmp_mem_type type;
 };
 
 static inline struct tegra_bpmp *
@@ -158,64 +168,171 @@ static void mbox_handle_rx(struct mbox_client *client, void *data)
 	tegra_bpmp_handle_rx(bpmp);
 }
 
-static int tegra186_bpmp_init(struct tegra_bpmp *bpmp)
+static void tegra186_bpmp_channel_deinit(struct tegra_bpmp *bpmp)
+{
+	int i;
+	struct tegra186_bpmp *priv = bpmp->priv;
+
+	for (i = 0; i < bpmp->threaded.count; i++) {
+		if (!bpmp->threaded_channels[i].bpmp)
+			continue;
+
+		tegra186_bpmp_channel_cleanup(&bpmp->threaded_channels[i]);
+	}
+
+	tegra186_bpmp_channel_cleanup(bpmp->rx_channel);
+	tegra186_bpmp_channel_cleanup(bpmp->tx_channel);
+
+	if (priv->type == TEGRA_SRAM) {
+		gen_pool_free(priv->sram.tx, (unsigned long)priv->tx.virt, 4096);
+		gen_pool_free(priv->sram.rx, (unsigned long)priv->rx.virt, 4096);
+	} else if (priv->type == TEGRA_RMEM) {
+		memunmap(priv->tx.virt);
+	}
+}
+
+static int tegra186_bpmp_channel_setup(struct tegra_bpmp *bpmp)
 {
-	struct tegra186_bpmp *priv;
 	unsigned int i;
 	int err;
 
-	priv = devm_kzalloc(bpmp->dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
+	err = tegra186_bpmp_channel_init(bpmp->tx_channel, bpmp,
+					 bpmp->soc->channels.cpu_tx.offset);
+	if (err < 0)
+		return err;
 
-	bpmp->priv = priv;
-	priv->parent = bpmp;
+	err = tegra186_bpmp_channel_init(bpmp->rx_channel, bpmp,
+					 bpmp->soc->channels.cpu_rx.offset);
+	if (err < 0) {
+		tegra186_bpmp_channel_cleanup(bpmp->tx_channel);
+		return err;
+	}
+
+	for (i = 0; i < bpmp->threaded.count; i++) {
+		unsigned int index = bpmp->soc->channels.thread.offset + i;
 
-	priv->tx.pool = of_gen_pool_get(bpmp->dev->of_node, "shmem", 0);
-	if (!priv->tx.pool) {
+		err = tegra186_bpmp_channel_init(&bpmp->threaded_channels[i],
+						 bpmp, index);
+		if (err < 0)
+			break;
+	}
+
+	if (err < 0)
+		tegra186_bpmp_channel_deinit(bpmp);
+
+	return err;
+}
+
+static void tegra186_bpmp_reset_channels(struct tegra_bpmp *bpmp)
+{
+	unsigned int i;
+
+	tegra186_bpmp_channel_reset(bpmp->tx_channel);
+	tegra186_bpmp_channel_reset(bpmp->rx_channel);
+
+	for (i = 0; i < bpmp->threaded.count; i++)
+		tegra186_bpmp_channel_reset(&bpmp->threaded_channels[i]);
+}
+
+static int tegra186_bpmp_sram_init(struct tegra_bpmp *bpmp)
+{
+	int err;
+	struct tegra186_bpmp *priv = bpmp->priv;
+
+	priv->sram.tx = of_gen_pool_get(bpmp->dev->of_node, "shmem", 0);
+	if (!priv->sram.tx) {
 		dev_err(bpmp->dev, "TX shmem pool not found\n");
 		return -EPROBE_DEFER;
 	}
 
-	priv->tx.virt = (void __iomem *)gen_pool_dma_alloc(priv->tx.pool, 4096, &priv->tx.phys);
+	priv->tx.virt = gen_pool_dma_alloc(priv->sram.tx, 4096, &priv->tx.phys);
 	if (!priv->tx.virt) {
 		dev_err(bpmp->dev, "failed to allocate from TX pool\n");
 		return -ENOMEM;
 	}
 
-	priv->rx.pool = of_gen_pool_get(bpmp->dev->of_node, "shmem", 1);
-	if (!priv->rx.pool) {
+	priv->sram.rx = of_gen_pool_get(bpmp->dev->of_node, "shmem", 1);
+	if (!priv->sram.rx) {
 		dev_err(bpmp->dev, "RX shmem pool not found\n");
 		err = -EPROBE_DEFER;
 		goto free_tx;
 	}
 
-	priv->rx.virt = (void __iomem *)gen_pool_dma_alloc(priv->rx.pool, 4096, &priv->rx.phys);
+	priv->rx.virt = gen_pool_dma_alloc(priv->sram.rx, 4096, &priv->rx.phys);
 	if (!priv->rx.virt) {
 		dev_err(bpmp->dev, "failed to allocate from RX pool\n");
 		err = -ENOMEM;
 		goto free_tx;
 	}
 
-	err = tegra186_bpmp_channel_init(bpmp->tx_channel, bpmp,
-					 bpmp->soc->channels.cpu_tx.offset);
-	if (err < 0)
-		goto free_rx;
+	priv->type = TEGRA_SRAM;
 
-	err = tegra186_bpmp_channel_init(bpmp->rx_channel, bpmp,
-					 bpmp->soc->channels.cpu_rx.offset);
-	if (err < 0)
-		goto cleanup_tx_channel;
+	return 0;
 
-	for (i = 0; i < bpmp->threaded.count; i++) {
-		unsigned int index = bpmp->soc->channels.thread.offset + i;
+free_tx:
+	gen_pool_free(priv->sram.tx, (unsigned long)priv->tx.virt, 4096);
 
-		err = tegra186_bpmp_channel_init(&bpmp->threaded_channels[i],
-						 bpmp, index);
+	return err;
+}
+
+static enum tegra_bpmp_mem_type tegra186_bpmp_dram_init(struct tegra_bpmp *bpmp)
+{
+	int err;
+	struct resource res;
+	struct device_node *np;
+	struct tegra186_bpmp *priv = bpmp->priv;
+
+	np = of_parse_phandle(bpmp->dev->of_node, "memory-region", 0);
+	if (!np)
+		return TEGRA_INVALID;
+
+	err = of_address_to_resource(np, 0, &res);
+	if (err) {
+		dev_warn(bpmp->dev,  "Parsing memory region returned: %d\n", err);
+		return TEGRA_INVALID;
+	}
+
+	if ((res.end - res.start + 1) < 0x2000) {
+		dev_warn(bpmp->dev,  "DRAM region less than 0x2000 bytes\n");
+		return TEGRA_INVALID;
+	}
+
+	priv->tx.phys = res.start;
+	priv->rx.phys = res.start + 0x1000;
+
+	priv->tx.virt = memremap(priv->tx.phys, res.end - res.start + 1, MEMREMAP_WC);
+	if (priv->tx.virt == NULL) {
+		dev_warn(bpmp->dev,  "DRAM region mapping failed\n");
+		return TEGRA_INVALID;
+	}
+	priv->rx.virt = priv->tx.virt + 0x1000;
+
+	return TEGRA_RMEM;
+}
+
+static int tegra186_bpmp_init(struct tegra_bpmp *bpmp)
+{
+	struct tegra186_bpmp *priv;
+	int err;
+
+	priv = devm_kzalloc(bpmp->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	bpmp->priv = priv;
+	priv->parent = bpmp;
+
+	priv->type = tegra186_bpmp_dram_init(bpmp);
+	if (priv->type == TEGRA_INVALID) {
+		err = tegra186_bpmp_sram_init(bpmp);
 		if (err < 0)
-			goto cleanup_channels;
+			return err;
 	}
 
+	err = tegra186_bpmp_channel_setup(bpmp);
+	if (err < 0)
+		return err;
+
 	/* mbox registration */
 	priv->mbox.client.dev = bpmp->dev;
 	priv->mbox.client.rx_callback = mbox_handle_rx;
@@ -226,51 +343,22 @@ static int tegra186_bpmp_init(struct tegra_bpmp *bpmp)
 	if (IS_ERR(priv->mbox.channel)) {
 		err = PTR_ERR(priv->mbox.channel);
 		dev_err(bpmp->dev, "failed to get HSP mailbox: %d\n", err);
-		goto cleanup_channels;
+		tegra186_bpmp_channel_deinit(bpmp);
+		return err;
 	}
 
-	tegra186_bpmp_channel_reset(bpmp->tx_channel);
-	tegra186_bpmp_channel_reset(bpmp->rx_channel);
-
-	for (i = 0; i < bpmp->threaded.count; i++)
-		tegra186_bpmp_channel_reset(&bpmp->threaded_channels[i]);
+	tegra186_bpmp_reset_channels(bpmp);
 
 	return 0;
-
-cleanup_channels:
-	for (i = 0; i < bpmp->threaded.count; i++) {
-		if (!bpmp->threaded_channels[i].bpmp)
-			continue;
-
-		tegra186_bpmp_channel_cleanup(&bpmp->threaded_channels[i]);
-	}
-
-	tegra186_bpmp_channel_cleanup(bpmp->rx_channel);
-cleanup_tx_channel:
-	tegra186_bpmp_channel_cleanup(bpmp->tx_channel);
-free_rx:
-	gen_pool_free(priv->rx.pool, (unsigned long)priv->rx.virt, 4096);
-free_tx:
-	gen_pool_free(priv->tx.pool, (unsigned long)priv->tx.virt, 4096);
-
-	return err;
 }
 
 static void tegra186_bpmp_deinit(struct tegra_bpmp *bpmp)
 {
 	struct tegra186_bpmp *priv = bpmp->priv;
-	unsigned int i;
 
 	mbox_free_channel(priv->mbox.channel);
 
-	for (i = 0; i < bpmp->threaded.count; i++)
-		tegra186_bpmp_channel_cleanup(&bpmp->threaded_channels[i]);
-
-	tegra186_bpmp_channel_cleanup(bpmp->rx_channel);
-	tegra186_bpmp_channel_cleanup(bpmp->tx_channel);
-
-	gen_pool_free(priv->rx.pool, (unsigned long)priv->rx.virt, 4096);
-	gen_pool_free(priv->tx.pool, (unsigned long)priv->tx.virt, 4096);
+	tegra186_bpmp_channel_deinit(bpmp);
 }
 
 static int tegra186_bpmp_resume(struct tegra_bpmp *bpmp)
diff --git a/drivers/firmware/tegra/bpmp.c b/drivers/firmware/tegra/bpmp.c
index 8b5e5daa9fae..17bd3590aaa2 100644
--- a/drivers/firmware/tegra/bpmp.c
+++ b/drivers/firmware/tegra/bpmp.c
@@ -735,6 +735,8 @@ static int tegra_bpmp_probe(struct platform_device *pdev)
 	if (!bpmp->threaded_channels)
 		return -ENOMEM;
 
+	platform_set_drvdata(pdev, bpmp);
+
 	err = bpmp->soc->ops->init(bpmp);
 	if (err < 0)
 		return err;
@@ -758,8 +760,6 @@ static int tegra_bpmp_probe(struct platform_device *pdev)
 
 	dev_info(&pdev->dev, "firmware: %.*s\n", (int)sizeof(tag), tag);
 
-	platform_set_drvdata(pdev, bpmp);
-
 	err = of_platform_default_populate(pdev->dev.of_node, NULL, &pdev->dev);
 	if (err < 0)
 		goto free_mrq;
-- 
2.40.0