[PATCH v4 08/10] remoteproc: qcom: Modify reset sequence for hexagon to support q6v56

[Avaneesh Kumar Dwivedi <akdwived@codeaurora.org>]

This change introduces appropriate additional steps in reset sequence
so that hexagon on q6v56 is brough out of reset.

Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@codeaurora.org>
---
 drivers/remoteproc/qcom_q6v5_pil.c | 126 ++++++++++++++++++++++++++++++-------
 1 file changed, 104 insertions(+), 22 deletions(-)

diff --git a/drivers/remoteproc/qcom_q6v5_pil.c b/drivers/remoteproc/qcom_q6v5_pil.c
index 77a69eb..3fccde4 100644
--- a/drivers/remoteproc/qcom_q6v5_pil.c
+++ b/drivers/remoteproc/qcom_q6v5_pil.c
@@ -65,6 +65,8 @@
 #define QDSP6SS_RESET_REG		0x014
 #define QDSP6SS_GFMUX_CTL_REG		0x020
 #define QDSP6SS_PWR_CTL_REG		0x030
+#define QDSP6SS_MEM_PWR_CTL		0x0B0
+#define QDSP6SS_STRAP_ACC		0x110
 
 /* AXI Halt Register Offsets */
 #define AXI_HALTREQ_REG			0x0
@@ -93,6 +95,15 @@
 #define QDSS_BHS_ON			BIT(21)
 #define QDSS_LDO_BYP			BIT(22)
 
+/* QDSP6v56 parameters */
+#define QDSP6v56_LDO_BYP                BIT(25)
+#define QDSP6v56_BHS_ON                 BIT(24)
+#define QDSP6v56_CLAMP_WL               BIT(21)
+#define QDSP6v56_CLAMP_QMC_MEM          BIT(22)
+#define HALT_CHECK_MAX_LOOPS            (200)
+#define QDSP6SS_XO_CBCR                 (0x0038)
+#define QDSP6SS_ACC_OVERRIDE_VAL	0x20
+
 struct q6_rproc_res {
 	char *q6_mba_image;
 	int (*q6_reset_init)(void *q, void *p);
@@ -407,35 +418,106 @@ static int q6v5_rmb_mba_wait(struct q6v5 *qproc, u32 status, int ms)
 
 static int q6v5proc_reset(struct q6v5 *qproc)
 {
-	u32 val;
-	int ret;
+	int ret, i, count;
+	u64 val;
+
+	/* Override the ACC value if required */
+	if (qproc->qdsp6v56_1_5)
+		writel_relaxed(QDSP6SS_ACC_OVERRIDE_VAL,
+				qproc->reg_base + QDSP6SS_STRAP_ACC);
 
 	/* Assert resets, stop core */
 	val = readl(qproc->reg_base + QDSP6SS_RESET_REG);
 	val |= (Q6SS_CORE_ARES | Q6SS_BUS_ARES_ENABLE | Q6SS_STOP_CORE);
 	writel(val, qproc->reg_base + QDSP6SS_RESET_REG);
 
-	/* Enable power block headswitch, and wait for it to stabilize */
-	val = readl(qproc->reg_base + QDSP6SS_PWR_CTL_REG);
-	val |= QDSS_BHS_ON | QDSS_LDO_BYP;
-	writel(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
-	udelay(1);
-
-	/*
-	 * Turn on memories. L2 banks should be done individually
-	 * to minimize inrush current.
-	 */
-	val = readl(qproc->reg_base + QDSP6SS_PWR_CTL_REG);
-	val |= Q6SS_SLP_RET_N | Q6SS_L2TAG_SLP_NRET_N |
-		Q6SS_ETB_SLP_NRET_N | Q6SS_L2DATA_STBY_N;
-	writel(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
-	val |= Q6SS_L2DATA_SLP_NRET_N_2;
-	writel(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
-	val |= Q6SS_L2DATA_SLP_NRET_N_1;
-	writel(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
-	val |= Q6SS_L2DATA_SLP_NRET_N_0;
-	writel(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
+	/* BHS require xo cbcr to be enabled */
+	if (qproc->qdsp6v56_1_5) {
+		val = readl_relaxed(qproc->reg_base + QDSP6SS_XO_CBCR);
+		val |= 0x1;
+		writel_relaxed(val, qproc->reg_base + QDSP6SS_XO_CBCR);
+		for (count = HALT_CHECK_MAX_LOOPS; count > 0; count--) {
+			val = readl_relaxed(qproc->reg_base + QDSP6SS_XO_CBCR);
+			if (!(val & BIT(31)))
+				break;
+			udelay(1);
+		}
 
+		val = readl_relaxed(qproc->reg_base + QDSP6SS_XO_CBCR);
+		if ((val & BIT(31)))
+			dev_err(qproc->dev, "Failed to enable xo branch clock.\n");
+	}
+
+	if (qproc->qdsp6v56_1_5) {
+		/*
+		 * Enable power block headswitch,
+		 * and wait for it to stabilize
+		 */
+		val = readl_relaxed(qproc->reg_base + QDSP6SS_PWR_CTL_REG);
+		val |= QDSP6v56_BHS_ON;
+		writel_relaxed(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
+		udelay(1);
+
+		/* Put LDO in bypass mode */
+		val |= QDSP6v56_LDO_BYP;
+		writel_relaxed(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
+
+	} else {
+		/*
+		 * Enable power block headswitch,
+		 * and wait for it to stabilize
+		 */
+		val = readl(qproc->reg_base + QDSP6SS_PWR_CTL_REG);
+		val |= QDSS_BHS_ON | QDSS_LDO_BYP;
+		writel(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
+		udelay(1);
+	}
+
+	if (qproc->qdsp6v56_1_5) {
+		/*
+		 * Deassert QDSP6 compiler memory clamp
+		 */
+		val = readl_relaxed(qproc->reg_base + QDSP6SS_PWR_CTL_REG);
+		val &= ~QDSP6v56_CLAMP_QMC_MEM;
+		writel_relaxed(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
+
+		/* Deassert memory peripheral sleep and L2 memory standby */
+		val |= (Q6SS_L2DATA_STBY_N | Q6SS_SLP_RET_N);
+		writel_relaxed(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
+
+		/* Turn on L1, L2, ETB and JU memories 1 at a time */
+		val = readl_relaxed(qproc->reg_base + QDSP6SS_MEM_PWR_CTL);
+		for (i = 19; i >= 0; i--) {
+			val |= BIT(i);
+			writel_relaxed(val, qproc->reg_base +
+						QDSP6SS_MEM_PWR_CTL);
+			/*
+			 * Wait for 1us for both memory peripheral and
+			 * data array to turn on.
+			 */
+			 mb();
+			udelay(1);
+		}
+		/* Remove word line clamp */
+		val = readl_relaxed(qproc->reg_base + QDSP6SS_PWR_CTL_REG);
+		val &= ~QDSP6v56_CLAMP_WL;
+		writel_relaxed(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
+	} else {
+		/*
+		 * Turn on memories. L2 banks should be done individually
+		 * to minimize inrush current.
+		 */
+		val = readl(qproc->reg_base + QDSP6SS_PWR_CTL_REG);
+		val |= Q6SS_SLP_RET_N | Q6SS_L2TAG_SLP_NRET_N |
+			Q6SS_ETB_SLP_NRET_N | Q6SS_L2DATA_STBY_N;
+		writel(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
+		val |= Q6SS_L2DATA_SLP_NRET_N_2;
+		writel(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
+		val |= Q6SS_L2DATA_SLP_NRET_N_1;
+		writel(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
+		val |= Q6SS_L2DATA_SLP_NRET_N_0;
+		writel(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
+	}
 	/* Remove IO clamp */
 	val &= ~Q6SS_CLAMP_IO;
 	writel(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
-- 
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a Linux Foundation Collaborative Project.