From 102b0d2daa97dae68d3eed54d8fe37a9cc38a892 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 28 Apr 2024 11:13:47 +0200
Subject: Adding upstream version 2.8.0+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 plat/brcm/board/stingray/driver/ihost_pll_config.c | 287 +++++++++++++++++++++
 1 file changed, 287 insertions(+)
 create mode 100644 plat/brcm/board/stingray/driver/ihost_pll_config.c

(limited to 'plat/brcm/board/stingray/driver/ihost_pll_config.c')

diff --git a/plat/brcm/board/stingray/driver/ihost_pll_config.c b/plat/brcm/board/stingray/driver/ihost_pll_config.c
new file mode 100644
index 0000000..1184928
--- /dev/null
+++ b/plat/brcm/board/stingray/driver/ihost_pll_config.c
@@ -0,0 +1,287 @@
+/*
+ * Copyright (c) 2016-2020, Broadcom
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdint.h>
+
+#include <common/debug.h>
+#include <lib/mmio.h>
+
+#include <dmu.h>
+
+#define IHOST0_CONFIG_ROOT	0x66000000
+#define IHOST1_CONFIG_ROOT	0x66002000
+#define IHOST2_CONFIG_ROOT	0x66004000
+#define IHOST3_CONFIG_ROOT	0x66006000
+#define A72_CRM_PLL_PWR_ON	0x00000070
+#define A72_CRM_PLL_PWR_ON__PLL0_RESETB_R	4
+#define A72_CRM_PLL_PWR_ON__PLL0_POST_RESETB_R	5
+#define A72_CRM_PLL_CHNL_BYPS_EN		0x000000ac
+#define A72_CRM_PLL_CHNL_BYPS_EN__PLL_0_CHNL_0_BYPS_EN_R	0
+#define A72_CRM_PLL_CHNL_BYPS_EN_DATAMASK	0x0000ec1f
+#define A72_CRM_PLL_CMD				0x00000080
+#define A72_CRM_PLL_CMD__UPDATE_PLL0_FREQUENCY_VCO_R		0
+#define A72_CRM_PLL_CMD__UPDATE_PLL0_FREQUENCY_POST_R		1
+#define A72_CRM_PLL_STATUS			0x00000084
+#define A72_CRM_PLL_STATUS__PLL0_LOCK_R		9
+#define A72_CRM_PLL0_CTRL1			0x00000100
+#define A72_CRM_PLL0_CTRL2 			0x00000104
+#define A72_CRM_PLL0_CTRL3 			0x00000108
+#define A72_CRM_PLL0_CTRL3__PLL0_PDIV_R 12
+#define A72_CRM_PLL0_CTRL4 			0x0000010c
+#define A72_CRM_PLL0_CTRL4__PLL0_KP_R		0
+#define A72_CRM_PLL0_CTRL4__PLL0_KI_R		4
+#define A72_CRM_PLL0_CTRL4__PLL0_KA_R		7
+#define A72_CRM_PLL0_CTRL4__PLL0_FREFEFF_INFO_R	10
+
+#define PLL_MODE_VCO		0x0
+#define PLL_MODE_BYPASS		0x1
+#define PLL_RESET_TYPE_PLL	0x1
+#define PLL_RESET_TYPE_POST	0x2
+#define PLL_VCO			0x1
+#define PLL_POSTDIV		0x2
+#define ARM_FREQ_3G		PLL_FREQ_FULL
+#define ARM_FREQ_1P5G		PLL_FREQ_HALF
+#define ARM_FREQ_750M		PLL_FREQ_QRTR
+
+static unsigned int ARMCOE_crm_getBaseAddress(unsigned int cluster_num)
+{
+	unsigned int ihostx_config_root;
+
+	switch (cluster_num) {
+	case 0:
+	default:
+		ihostx_config_root = IHOST0_CONFIG_ROOT;
+		break;
+	case 1:
+		ihostx_config_root = IHOST1_CONFIG_ROOT;
+		break;
+	case 2:
+		ihostx_config_root = IHOST2_CONFIG_ROOT;
+		break;
+	case 3:
+		ihostx_config_root = IHOST3_CONFIG_ROOT;
+		break;
+	}
+
+	return ihostx_config_root;
+}
+
+static void ARMCOE_crm_pllAssertReset(unsigned int cluster_num,
+				      unsigned int reset_type)
+{
+	unsigned long ihostx_config_root;
+	unsigned int pll_rst_ctrl;
+
+	ihostx_config_root = ARMCOE_crm_getBaseAddress(cluster_num);
+	pll_rst_ctrl = mmio_read_32(ihostx_config_root + A72_CRM_PLL_PWR_ON);
+
+	// PLL reset
+	if (reset_type & PLL_RESET_TYPE_PLL) {
+		pll_rst_ctrl &= ~(0x1<<A72_CRM_PLL_PWR_ON__PLL0_RESETB_R);
+	}
+	// post-div channel reset
+	if (reset_type & PLL_RESET_TYPE_POST) {
+		pll_rst_ctrl &= ~(0x1<<A72_CRM_PLL_PWR_ON__PLL0_POST_RESETB_R);
+	}
+
+	mmio_write_32(ihostx_config_root + A72_CRM_PLL_PWR_ON, pll_rst_ctrl);
+}
+
+static void ARMCOE_crm_pllSetMode(unsigned int cluster_num, unsigned int mode)
+{
+	unsigned long ihostx_config_root;
+	unsigned int pll_byp_ctrl;
+
+	ihostx_config_root = ARMCOE_crm_getBaseAddress(cluster_num);
+	pll_byp_ctrl = mmio_read_32(ihostx_config_root +
+				    A72_CRM_PLL_CHNL_BYPS_EN);
+
+	if (mode == PLL_MODE_VCO) {
+		// use PLL DCO output
+		pll_byp_ctrl &=
+			~BIT(A72_CRM_PLL_CHNL_BYPS_EN__PLL_0_CHNL_0_BYPS_EN_R);
+	} else {
+		// use PLL bypass sources
+		pll_byp_ctrl |=
+			BIT(A72_CRM_PLL_CHNL_BYPS_EN__PLL_0_CHNL_0_BYPS_EN_R);
+	}
+
+	mmio_write_32(ihostx_config_root + A72_CRM_PLL_CHNL_BYPS_EN,
+		      pll_byp_ctrl);
+}
+
+static void ARMCOE_crm_pllFreqSet(unsigned int cluster_num,
+				  unsigned int ihost_pll_freq_sel,
+				  unsigned int pdiv)
+{
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac_low, ndiv_frac_high;
+	unsigned long ihostx_config_root;
+
+	ndiv_frac_low = 0x0;
+	ndiv_frac_high = 0x0;
+
+	if (ihost_pll_freq_sel == ARM_FREQ_3G) {
+		ndiv_int = 0x78;
+	} else if (ihost_pll_freq_sel == ARM_FREQ_1P5G) {
+		ndiv_int = 0x3c;
+	} else if (ihost_pll_freq_sel == ARM_FREQ_750M) {
+		ndiv_int = 0x1e;
+	} else {
+		return;
+	}
+
+	ndiv_int &= 0x3FF;                // low 10 bits
+	ndiv_frac_low &= 0x3FF;
+	ndiv_frac_high &= 0x3FF;
+
+	ihostx_config_root = ARMCOE_crm_getBaseAddress(cluster_num);
+
+	mmio_write_32(ihostx_config_root+A72_CRM_PLL0_CTRL1, ndiv_frac_low);
+	mmio_write_32(ihostx_config_root+A72_CRM_PLL0_CTRL2, ndiv_frac_high);
+	mmio_write_32(ihostx_config_root+A72_CRM_PLL0_CTRL3,
+		      ndiv_int |
+		      ((pdiv << A72_CRM_PLL0_CTRL3__PLL0_PDIV_R & 0xF000)));
+
+	mmio_write_32(ihostx_config_root + A72_CRM_PLL0_CTRL4,
+			/* From Section 10 of PLL spec */
+			(3 << A72_CRM_PLL0_CTRL4__PLL0_KP_R) |
+			/* From Section 10 of PLL spec */
+			(2 << A72_CRM_PLL0_CTRL4__PLL0_KI_R) |
+			/* Normal mode (i.e. not fast-locking) */
+			(0 << A72_CRM_PLL0_CTRL4__PLL0_KA_R) |
+			/* 50 MHz */
+			(50 << A72_CRM_PLL0_CTRL4__PLL0_FREFEFF_INFO_R));
+}
+
+static void ARMCOE_crm_pllDeassertReset(unsigned int cluster_num,
+					unsigned int reset_type)
+{
+	unsigned long ihostx_config_root;
+	unsigned int pll_rst_ctrl;
+
+	ihostx_config_root = ARMCOE_crm_getBaseAddress(cluster_num);
+	pll_rst_ctrl = mmio_read_32(ihostx_config_root + A72_CRM_PLL_PWR_ON);
+
+	// PLL reset
+	if (reset_type & PLL_RESET_TYPE_PLL) {
+		pll_rst_ctrl |= (0x1 << A72_CRM_PLL_PWR_ON__PLL0_RESETB_R);
+	}
+
+	// post-div channel reset
+	if (reset_type & PLL_RESET_TYPE_POST) {
+		pll_rst_ctrl |= (0x1 << A72_CRM_PLL_PWR_ON__PLL0_POST_RESETB_R);
+	}
+
+	mmio_write_32(ihostx_config_root + A72_CRM_PLL_PWR_ON, pll_rst_ctrl);
+}
+
+static void ARMCOE_crm_pllUpdate(unsigned int cluster_num, unsigned int type)
+{
+	unsigned long ihostx_config_root;
+	unsigned int pll_cmd;
+
+	ihostx_config_root = ARMCOE_crm_getBaseAddress(cluster_num);
+	pll_cmd = mmio_read_32(ihostx_config_root + A72_CRM_PLL_CMD);
+
+	// VCO update
+	if (type & PLL_VCO) {
+		pll_cmd |= BIT(A72_CRM_PLL_CMD__UPDATE_PLL0_FREQUENCY_VCO_R);
+	}
+	// post-div channel update
+	if (type & PLL_POSTDIV) {
+		pll_cmd |= BIT(A72_CRM_PLL_CMD__UPDATE_PLL0_FREQUENCY_POST_R);
+	}
+
+	mmio_write_32(ihostx_config_root+A72_CRM_PLL_CMD, pll_cmd);
+}
+
+static void insert_delay(unsigned int delay)
+{
+	volatile unsigned int index;
+
+	for (index = 0; index < delay; index++)
+		;
+}
+
+
+/*
+ * Returns 1 if PLL locked within certain interval
+ */
+static unsigned int ARMCOE_crm_pllIsLocked(unsigned int cluster_num)
+{
+	unsigned long ihostx_config_root;
+	unsigned int lock_status;
+	unsigned int i;
+
+	ihostx_config_root = ARMCOE_crm_getBaseAddress(cluster_num);
+
+	/* wait a while for pll to lock before returning from this function */
+	for (i = 0; i < 1500; i++) {
+		insert_delay(256);
+		lock_status = mmio_read_32(ihostx_config_root +
+					   A72_CRM_PLL_STATUS);
+		if (lock_status & BIT(A72_CRM_PLL_STATUS__PLL0_LOCK_R))
+			return 1;
+	}
+
+	ERROR("PLL of Cluster #%u failed to lock\n", cluster_num);
+	return 0;
+}
+
+/*
+ * ihost PLL Variable Frequency Configuration
+ *
+ * Frequency Limit {VCO,ARM} (GHz):
+ *	0 - no limit,
+ *	1 - {3.0,1.5},
+ *	2 - {4.0,2.0},
+ *	3 - {5.0,2.5}
+ */
+uint32_t bcm_set_ihost_pll_freq(uint32_t cluster_num, int ihost_pll_freq_sel)
+{
+	NOTICE("cluster: %u, freq_sel:0x%x\n", cluster_num, ihost_pll_freq_sel);
+
+	//bypass PLL
+	ARMCOE_crm_pllSetMode(cluster_num, PLL_MODE_BYPASS);
+	//assert reset
+	ARMCOE_crm_pllAssertReset(cluster_num,
+				  PLL_RESET_TYPE_PLL | PLL_RESET_TYPE_POST);
+	//set ndiv_int for different freq
+	ARMCOE_crm_pllFreqSet(cluster_num, ihost_pll_freq_sel, 0x1);
+	//de-assert reset
+	ARMCOE_crm_pllDeassertReset(cluster_num, PLL_RESET_TYPE_PLL);
+	ARMCOE_crm_pllUpdate(cluster_num, PLL_VCO);
+	//waiting for PLL lock
+	ARMCOE_crm_pllIsLocked(cluster_num);
+	ARMCOE_crm_pllDeassertReset(cluster_num, PLL_RESET_TYPE_POST);
+	//disable bypass PLL
+	ARMCOE_crm_pllSetMode(cluster_num, PLL_MODE_VCO);
+
+	return 0;
+}
+
+uint32_t bcm_get_ihost_pll_freq(uint32_t cluster_num)
+{
+	unsigned long ihostx_config_root;
+	uint32_t ndiv_int;
+	uint32_t ihost_pll_freq_sel;
+
+	ihostx_config_root = ARMCOE_crm_getBaseAddress(cluster_num);
+	ndiv_int = mmio_read_32(ihostx_config_root+A72_CRM_PLL0_CTRL3) & 0x3FF;
+
+	if (ndiv_int == 0x78) {
+		ihost_pll_freq_sel = ARM_FREQ_3G;
+	} else if (ndiv_int == 0x3c) {
+		ihost_pll_freq_sel = ARM_FREQ_1P5G;
+	} else if (ndiv_int == 0x1e) {
+		ihost_pll_freq_sel = ARM_FREQ_750M;
+	} else {
+		/* return unlimit otherwise*/
+		ihost_pll_freq_sel = 0;
+	}
+	return ihost_pll_freq_sel;
+}
-- 
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