[PATCH v1 10/15] remoteproc: mediatek: Add chip dependent operations for SCP core 1

[Tinghan Shen]

The SCP rproc operations has chip dependent callbacks. Implement a
version of these callbacks for MT8195 SCP core 1.

Signed-off-by: Tinghan Shen <tinghan.shen@xxxxxxxxxxxx>
---
 drivers/remoteproc/mtk_common.h   |   1 +
 drivers/remoteproc/mtk_scp.c      |   3 +-
 drivers/remoteproc/mtk_scp_dual.c | 121 +++++++++++++++++++++++++++++-
 3 files changed, 123 insertions(+), 2 deletions(-)

diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index 04f7ee590f96..7b363411ec99 100644
--- a/drivers/remoteproc/mtk_common.h
+++ b/drivers/remoteproc/mtk_common.h
@@ -171,4 +171,5 @@ int scp_parse_fw(struct rproc *rproc, const struct firmware *fw);
 int scp_map_memory_region(struct mtk_scp *scp);
 void scp_unmap_memory_region(struct mtk_scp *scp);
 irqreturn_t scp_irq_handler(int irq, void *priv);
+void scp_ipi_handler(struct mtk_scp *scp);
 #endif
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index c67883c28a43..55bc4e9d1a6f 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -84,7 +84,7 @@ static void scp_init_ipi_handler(void *data, unsigned int len, void *priv)
 	wake_up_interruptible(&scp->run.wq);
 }
 
-static void scp_ipi_handler(struct mtk_scp *scp)
+void scp_ipi_handler(struct mtk_scp *scp)
 {
 	struct mtk_share_obj __iomem *rcv_obj = scp->recv_buf;
 	struct scp_ipi_desc *ipi_desc = scp->ipi_desc;
@@ -118,6 +118,7 @@ static void scp_ipi_handler(struct mtk_scp *scp)
 	scp->ipi_id_ack[id] = true;
 	wake_up(&scp->ack_wq);
 }
+EXPORT_SYMBOL_GPL(scp_ipi_handler);
 
 static int scp_elf_read_ipi_buf_addr(struct mtk_scp *scp,
 				     const struct firmware *fw,
diff --git a/drivers/remoteproc/mtk_scp_dual.c b/drivers/remoteproc/mtk_scp_dual.c
index d4cc15e22640..16cf9d2628c8 100644
--- a/drivers/remoteproc/mtk_scp_dual.c
+++ b/drivers/remoteproc/mtk_scp_dual.c
@@ -12,6 +12,124 @@
 #include "mtk_common.h"
 #include "remoteproc_internal.h"
 
+static void mt8195_power_on_sram(void __iomem *addr)
+{
+	int i;
+
+	for (i = 31; i >= 0; i--)
+		writel(GENMASK(i, 0), addr);
+	writel(0, addr);
+}
+
+static void mt8195_power_off_sram(void __iomem *addr)
+{
+	int i;
+
+	writel(0, addr);
+	for (i = 0; i < 32; i++)
+		writel(GENMASK(i, 0), addr);
+}
+
+static int mt8195_scp_dual_before_load(struct mtk_scp *scp)
+{
+	u32 sec_ctrl;
+
+	mt8195_power_on_sram(scp->reg_base + MT8195_CPU1_SRAM_PD);
+
+	/* hold SCP in reset while loading FW. */
+	scp->data->scp_reset_assert(scp);
+
+	/* enable MPU for all memory regions */
+	writel(0xff, scp->reg_base + MT8195_CORE1_MEM_ATT_PREDEF);
+
+	return 0;
+}
+
+static void mt8195_scp_dual_irq_handler(struct mtk_scp *scp)
+{
+	u32 scp_to_host;
+
+	scp_to_host = readl(scp->reg_base + MT8195_SSHUB2APMCU_IPC_SET);
+
+	if (scp_to_host & MT8192_SCP_IPC_INT_BIT) {
+		scp_ipi_handler(scp);
+
+		/*
+		 * SCP won't send another interrupt until we clear
+		 * MT8195_SSHUB2APMCU_IPC_CLR.
+		 */
+		writel(MT8192_SCP_IPC_INT_BIT,
+		       scp->reg_base + MT8195_SSHUB2APMCU_IPC_CLR);
+	}
+}
+
+static void mt8195_scp_dual_reset_assert(struct mtk_scp *scp)
+{
+	writel(1, scp->reg_base + MT8195_CORE1_SW_RSTN_SET);
+}
+
+static void mt8195_scp_dual_reset_deassert(struct mtk_scp *scp)
+{
+	writel(1, scp->reg_base + MT8195_CORE1_SW_RSTN_CLR);
+}
+
+static void *mt8195_scp_dual_da_to_va(struct mtk_scp *scp, u64 da, size_t len)
+{
+	int offset;
+
+	if (da >= scp->sram_phys &&
+	    (da + len) <= scp->sram_phys + scp->sram_size) {
+		offset = da - scp->sram_phys;
+		return (void __force *)scp->sram_base + offset;
+	}
+
+	/* optional memory region */
+	if (scp->l1tcm_size &&
+	    da >= scp->l1tcm_phys &&
+	    (da + len) <= scp->l1tcm_phys + scp->l1tcm_size) {
+		offset = da - scp->l1tcm_phys;
+		return (void __force *)scp->l1tcm_base + offset;
+	}
+
+	/* optional memory region */
+	if (scp->dram_size &&
+	    da >= scp->dma_addr &&
+	    (da + len) <= scp->dma_addr + scp->dram_size) {
+		offset = da - scp->dma_addr;
+		return scp->cpu_addr + offset;
+	}
+
+	return NULL;
+}
+
+static void mt8195_scp_dual_stop(struct mtk_scp *scp)
+{
+	/* Power off CPU SRAM */
+	mt8195_power_off_sram(scp->reg_base + MT8195_CPU1_SRAM_PD);
+
+	/* Disable SCP watchdog */
+	writel(0, scp->reg_base + MT8195_CORE1_WDT_CFG);
+}
+
+static int mt8195_scp_dual_clk_get(struct mtk_scp *scp)
+{
+	scp->clk = NULL;
+
+	return 0;
+}
+
+static const struct mtk_scp_of_data mt8195_scp_dual_of_data = {
+	.scp_clk_get = mt8195_scp_dual_clk_get,
+	.scp_before_load = mt8195_scp_dual_before_load,
+	.scp_irq_handler = mt8195_scp_dual_irq_handler,
+	.scp_reset_assert = mt8195_scp_dual_reset_assert,
+	.scp_reset_deassert = mt8195_scp_dual_reset_deassert,
+	.scp_stop = mt8195_scp_dual_stop,
+	.scp_da_to_va = mt8195_scp_dual_da_to_va,
+	.host_to_scp_reg = MT8192_GIPC_IN_SET,
+	.host_to_scp_int_bit = MT8195_HOST_IPC_INT_BIT,
+};
+
 static const struct rproc_ops scp_ops = {
 	.start		= scp_start,
 	.stop		= scp_stop,
@@ -53,6 +171,7 @@ static int scp_dual_probe(struct platform_device *pdev)
 	scp = (struct mtk_scp *)rproc->priv;
 	scp->rproc = rproc;
 	scp->dev = dev;
+	scp->data = of_device_get_match_data(dev);
 	platform_set_drvdata(pdev, scp);
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
@@ -125,7 +244,7 @@ static int scp_dual_remove(struct platform_device *pdev)
 }
 
 static const struct of_device_id mtk_scp_dual_of_match[] = {
-	{ .compatible = "mediatek,mt8195-scp-dual" },
+	{ .compatible = "mediatek,mt8195-scp-dual", .data = &mt8195_scp_dual_of_data },
 	{},
 };
 MODULE_DEVICE_TABLE(of, mtk_scp_dual_of_match);
-- 
2.18.0