From: Mikko Perttunen <mperttunen@nvidia.com>
Date: Tue, 20 Sep 2022 11:11:56 +0300
Subject: memory: tegra: Add API for retrieving carveout bounds
Git-commit: 7946920d402d9a4b5bf53c3adc3783105dbf3966
Patch-mainline: v6.2-rc1
References: jsc#PED-1763

On Tegra234 NVDEC firmware is loaded from a secure carveout, where it
has been loaded by a bootloader. When booting NVDEC, we need to tell it
the address of this firmware, which we can determine by checking the
starting address of the carveout. As such, add an MC API to query the
bounds of carveouts, and add related information on Tegra234.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
---
 drivers/memory/tegra/mc.c       | 25 +++++++++++++++++++++++++
 drivers/memory/tegra/tegra234.c |  5 +++++
 include/soc/tegra/mc.h          | 11 +++++++++++
 3 files changed, 41 insertions(+)

diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
index 2f7a58a9df1ae..592907546ee64 100644
--- a/drivers/memory/tegra/mc.c
+++ b/drivers/memory/tegra/mc.c
@@ -107,6 +107,31 @@ int tegra_mc_probe_device(struct tegra_mc *mc, struct device *dev)
 }
 EXPORT_SYMBOL_GPL(tegra_mc_probe_device);
 
+int tegra_mc_get_carveout_info(struct tegra_mc *mc, unsigned int id,
+                               phys_addr_t *base, u64 *size)
+{
+	u32 offset;
+
+	if (id < 1 || id >= mc->soc->num_carveouts)
+		return -EINVAL;
+
+	if (id < 6)
+		offset = 0xc0c + 0x50 * (id - 1);
+	else
+		offset = 0x2004 + 0x50 * (id - 6);
+
+	*base = mc_ch_readl(mc, MC_BROADCAST_CHANNEL, offset + 0x0);
+#ifdef CONFIG_PHYS_ADDR_T_64BIT
+	*base |= (phys_addr_t)mc_ch_readl(mc, MC_BROADCAST_CHANNEL, offset + 0x4) << 32;
+#endif
+
+	if (size)
+		*size = mc_ch_readl(mc, MC_BROADCAST_CHANNEL, offset + 0x8) << 17;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(tegra_mc_get_carveout_info);
+
 static int tegra_mc_block_dma_common(struct tegra_mc *mc,
 				     const struct tegra_mc_reset *rst)
 {
diff --git a/drivers/memory/tegra/tegra234.c b/drivers/memory/tegra/tegra234.c
index a9e8fd99730fa..74d291d66366b 100644
--- a/drivers/memory/tegra/tegra234.c
+++ b/drivers/memory/tegra/tegra234.c
@@ -187,4 +187,9 @@ const struct tegra_mc_soc tegra234_mc_soc = {
 	.ops = &tegra186_mc_ops,
 	.ch_intmask = 0x0000ff00,
 	.global_intstatus_channel_shift = 8,
+	/*
+	 * Additionally, there are lite carveouts but those are not currently
+	 * supported.
+	 */
+	.num_carveouts = 32,
 };
diff --git a/include/soc/tegra/mc.h b/include/soc/tegra/mc.h
index 47ce6d4344273..51a2263e1bc59 100644
--- a/include/soc/tegra/mc.h
+++ b/include/soc/tegra/mc.h
@@ -193,6 +193,8 @@ struct tegra_mc_soc {
 	unsigned int num_address_bits;
 	unsigned int atom_size;
 
+	unsigned int num_carveouts;
+
 	u16 client_id_mask;
 	u8 num_channels;
 
@@ -244,6 +246,8 @@ unsigned int tegra_mc_get_emem_device_count(struct tegra_mc *mc);
 #ifdef CONFIG_TEGRA_MC
 struct tegra_mc *devm_tegra_memory_controller_get(struct device *dev);
 int tegra_mc_probe_device(struct tegra_mc *mc, struct device *dev);
+int tegra_mc_get_carveout_info(struct tegra_mc *mc, unsigned int id,
+                               phys_addr_t *base, u64 *size);
 #else
 static inline struct tegra_mc *
 devm_tegra_memory_controller_get(struct device *dev)
@@ -256,6 +260,13 @@ tegra_mc_probe_device(struct tegra_mc *mc, struct device *dev)
 {
 	return -ENODEV;
 }
+
+static inline int
+tegra_mc_get_carveout_info(struct tegra_mc *mc, unsigned int id,
+                           phys_addr_t *base, u64 *size)
+{
+	return -ENODEV;
+}
 #endif
 
 #endif /* __SOC_TEGRA_MC_H__ */
-- 
2.38.1