memory: tegra: Add API for retrieving carveout bounds

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>

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)
 {

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,
 };

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__ */