arch/arm/cpu/arm720t/tegra-common/cpu.c - github/trini/u-boot - Gitiles

 /*
  * Copyright (c) 2010-2012, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */

 #include <common.h>
 #include <asm/io.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/gp_padctrl.h>
 #include <asm/arch/pinmux.h>
 #include <asm/arch/tegra.h>
 #include <asm/arch-tegra/clk_rst.h>
 #include <asm/arch-tegra/pmc.h>
 #include <asm/arch-tegra/scu.h>
 #include "cpu.h"

 int get_num_cpus(void)
 {
 	struct apb_misc_gp_ctlr *gp;
 	uint rev;

 	gp = (struct apb_misc_gp_ctlr *)NV_PA_APB_MISC_GP_BASE;
 	rev = (readl(&gp->hidrev) & HIDREV_CHIPID_MASK) >> HIDREV_CHIPID_SHIFT;

 	switch (rev) {
 	case CHIPID_TEGRA20:
 		return 2;
 		break;
 	case CHIPID_TEGRA30:
 	case CHIPID_TEGRA114:
 	default:
 		return 4;
 		break;
 	}
 }

 /*
  * Timing tables for each SOC for all four oscillator options.
  */
 struct clk_pll_table tegra_pll_x_table[TEGRA_SOC_CNT][CLOCK_OSC_FREQ_COUNT] = {
 	/* T20: 1 GHz */
 	/*  n,  m, p, cpcon */
 	{{ 1000, 13, 0, 12},	/* OSC 13M */
 	 { 625,  12, 0, 8},	/* OSC 19.2M */
 	 { 1000, 12, 0, 12},	/* OSC 12M */
 	 { 1000, 26, 0, 12},	/* OSC 26M */
 	},

 	/* T25: 1.2 GHz */
 	{{ 923, 10, 0, 12},
 	 { 750, 12, 0, 8},
 	 { 600,  6, 0, 12},
 	 { 600, 13, 0, 12},
 	},

 	/* T30: 1.4 GHz */
 	{{ 862, 8, 0, 8},
 	 { 583, 8, 0, 4},
 	 { 700, 6, 0, 8},
 	 { 700, 13, 0, 8},
 	},

 	/* T114: 1.4 GHz */
 	{{ 862, 8, 0, 8},
 	 { 583, 8, 0, 4},
 	 { 696, 12, 0, 8},
 	 { 700, 13, 0, 8},
 	},
 };

 void adjust_pllp_out_freqs(void)
 {
 	struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
 	struct clk_pll *pll = &clkrst->crc_pll[CLOCK_ID_PERIPH];
 	u32 reg;

 	/* Set T30 PLLP_OUT1, 2, 3 & 4 freqs to 9.6, 48, 102 & 204MHz */
 	reg = readl(&pll->pll_out[0]);	/* OUTA, contains OUT2 / OUT1 */
 	reg |= (IN_408_OUT_48_DIVISOR << PLLP_OUT2_RATIO) | PLLP_OUT2_OVR
 		| (IN_408_OUT_9_6_DIVISOR << PLLP_OUT1_RATIO) | PLLP_OUT1_OVR;
 	writel(reg, &pll->pll_out[0]);

 	reg = readl(&pll->pll_out[1]);   /* OUTB, contains OUT4 / OUT3 */
 	reg |= (IN_408_OUT_204_DIVISOR << PLLP_OUT4_RATIO) | PLLP_OUT4_OVR
 		| (IN_408_OUT_102_DIVISOR << PLLP_OUT3_RATIO) | PLLP_OUT3_OVR;
 	writel(reg, &pll->pll_out[1]);
 }

 int pllx_set_rate(struct clk_pll_simple *pll , u32 divn, u32 divm,
 		u32 divp, u32 cpcon)
 {
 	u32 reg;

 	/* If PLLX is already enabled, just return */
 	if (readl(&pll->pll_base) & PLL_ENABLE_MASK) {
 		debug("pllx_set_rate: PLLX already enabled, returning\n");
 		return 0;
 	}

 	debug(" pllx_set_rate entry\n");

 	/* Set BYPASS, m, n and p to PLLX_BASE */
 	reg = PLL_BYPASS_MASK | (divm << PLL_DIVM_SHIFT);
 	reg |= ((divn << PLL_DIVN_SHIFT) | (divp << PLL_DIVP_SHIFT));
 	writel(reg, &pll->pll_base);

 	/* Set cpcon to PLLX_MISC */
 	reg = (cpcon << PLL_CPCON_SHIFT);

 	/* Set dccon to PLLX_MISC if freq > 600MHz */
 	if (divn > 600)
 		reg |= (1 << PLL_DCCON_SHIFT);
 	writel(reg, &pll->pll_misc);

 	/* Enable PLLX */
 	reg = readl(&pll->pll_base);
 	reg |= PLL_ENABLE_MASK;

 	/* Disable BYPASS */
 	reg &= ~PLL_BYPASS_MASK;
 	writel(reg, &pll->pll_base);

 	/* Set lock_enable to PLLX_MISC */
 	reg = readl(&pll->pll_misc);
 	reg |= PLL_LOCK_ENABLE_MASK;
 	writel(reg, &pll->pll_misc);

 	return 0;
 }

 void init_pllx(void)
 {
 	struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
 	struct clk_pll_simple *pll = &clkrst->crc_pll_simple[SIMPLE_PLLX];
 	int soc_type, sku_info, chip_sku;
 	enum clock_osc_freq osc;
 	struct clk_pll_table *sel;

 	debug("init_pllx entry\n");

 	/* get SOC (chip) type */
 	soc_type = tegra_get_chip();
 	debug(" init_pllx: SoC = 0x%02X\n", soc_type);

 	/* get SKU info */
 	sku_info = tegra_get_sku_info();
 	debug(" init_pllx: SKU info byte = 0x%02X\n", sku_info);

 	/* get chip SKU, combo of the above info */
 	chip_sku = tegra_get_chip_sku();
 	debug(" init_pllx: Chip SKU = %d\n", chip_sku);

 	/* get osc freq */
 	osc = clock_get_osc_freq();
 	debug(" init_pllx: osc = %d\n", osc);

 	/* set pllx */
 	sel = &tegra_pll_x_table[chip_sku][osc];
 	pllx_set_rate(pll, sel->n, sel->m, sel->p, sel->cpcon);

 	/* adjust PLLP_out1-4 on T3x/T114 */
 	if (soc_type >= CHIPID_TEGRA30) {
 		debug("  init_pllx: adjusting PLLP out freqs\n");
 		adjust_pllp_out_freqs();
 	}
 }

 void enable_cpu_clock(int enable)
 {
 	struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
 	u32 clk;

 	/*
 	 * NOTE:
 	 * Regardless of whether the request is to enable or disable the CPU
 	 * clock, every processor in the CPU complex except the master (CPU 0)
 	 * will have it's clock stopped because the AVP only talks to the
 	 * master.
 	 */

 	if (enable) {
 		/* Initialize PLLX */
 		init_pllx();

 		/* Wait until all clocks are stable */
 		udelay(PLL_STABILIZATION_DELAY);

 		writel(CCLK_BURST_POLICY, &clkrst->crc_cclk_brst_pol);
 		writel(SUPER_CCLK_DIVIDER, &clkrst->crc_super_cclk_div);
 	}

 	/*
 	 * Read the register containing the individual CPU clock enables and
 	 * always stop the clocks to CPUs > 0.
 	 */
 	clk = readl(&clkrst->crc_clk_cpu_cmplx);
 	clk |= 1 << CPU1_CLK_STP_SHIFT;
 	if (get_num_cpus() == 4)
 		clk |= (1 << CPU2_CLK_STP_SHIFT) + (1 << CPU3_CLK_STP_SHIFT);

 	/* Stop/Unstop the CPU clock */
 	clk &= ~CPU0_CLK_STP_MASK;
 	clk |= !enable << CPU0_CLK_STP_SHIFT;
 	writel(clk, &clkrst->crc_clk_cpu_cmplx);

 	clock_enable(PERIPH_ID_CPU);
 }

 static int is_cpu_powered(void)
 {
 	struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE;

 	return (readl(&pmc->pmc_pwrgate_status) & CPU_PWRED) ? 1 : 0;
 }

 static void remove_cpu_io_clamps(void)
 {
 	struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE;
 	u32 reg;

 	/* Remove the clamps on the CPU I/O signals */
 	reg = readl(&pmc->pmc_remove_clamping);
 	reg |= CPU_CLMP;
 	writel(reg, &pmc->pmc_remove_clamping);

 	/* Give I/O signals time to stabilize */
 	udelay(IO_STABILIZATION_DELAY);
 }

 void powerup_cpu(void)
 {
 	struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE;
 	u32 reg;
 	int timeout = IO_STABILIZATION_DELAY;

 	if (!is_cpu_powered()) {
 		/* Toggle the CPU power state (OFF -> ON) */
 		reg = readl(&pmc->pmc_pwrgate_toggle);
 		reg &= PARTID_CP;
 		reg |= START_CP;
 		writel(reg, &pmc->pmc_pwrgate_toggle);

 		/* Wait for the power to come up */
 		while (!is_cpu_powered()) {
 			if (timeout-- == 0)
 				printf("CPU failed to power up!\n");
 			else
 				udelay(10);
 		}

 		/*
 		 * Remove the I/O clamps from CPU power partition.
 		 * Recommended only on a Warm boot, if the CPU partition gets
 		 * power gated. Shouldn't cause any harm when called after a
 		 * cold boot according to HW, probably just redundant.
 		 */
 		remove_cpu_io_clamps();
 	}
 }

 void reset_A9_cpu(int reset)
 {
 	/*
 	* NOTE:  Regardless of whether the request is to hold the CPU in reset
 	*        or take it out of reset, every processor in the CPU complex
 	*        except the master (CPU 0) will be held in reset because the
 	*        AVP only talks to the master. The AVP does not know that there
 	*        are multiple processors in the CPU complex.
 	*/
 	int mask = crc_rst_cpu | crc_rst_de | crc_rst_debug;
 	int num_cpus = get_num_cpus();
 	int cpu;

 	debug("reset_a9_cpu entry\n");
 	/* Hold CPUs 1 onwards in reset, and CPU 0 if asked */
 	for (cpu = 1; cpu < num_cpus; cpu++)
 		reset_cmplx_set_enable(cpu, mask, 1);
 	reset_cmplx_set_enable(0, mask, reset);

 	/* Enable/Disable master CPU reset */
 	reset_set_enable(PERIPH_ID_CPU, reset);
 }

 void clock_enable_coresight(int enable)
 {
 	u32 rst, src = 2;
 	int soc_type;

 	debug("clock_enable_coresight entry\n");
 	clock_set_enable(PERIPH_ID_CORESIGHT, enable);
 	reset_set_enable(PERIPH_ID_CORESIGHT, !enable);

 	if (enable) {
 		/*
 		 * Put CoreSight on PLLP_OUT0 and divide it down as per
 		 * PLLP base frequency based on SoC type (T20/T30/T114).
 		 * Clock divider request would setup CSITE clock as 144MHz
 		 * for PLLP base 216MHz and 204MHz for PLLP base 408MHz
 		 */

 		soc_type = tegra_get_chip();
 		if (soc_type == CHIPID_TEGRA30 || soc_type == CHIPID_TEGRA114)
 			src = CLK_DIVIDER(NVBL_PLLP_KHZ, 204000);
 		else if (soc_type == CHIPID_TEGRA20)
 			src = CLK_DIVIDER(NVBL_PLLP_KHZ, 144000);
 		else
 			printf("%s: Unknown SoC type %X!\n",
 				 __func__, soc_type);

 		clock_ll_set_source_divisor(PERIPH_ID_CSI, 0, src);

 		/* Unlock the CPU CoreSight interfaces */
 		rst = CORESIGHT_UNLOCK;
 		writel(rst, CSITE_CPU_DBG0_LAR);
 		writel(rst, CSITE_CPU_DBG1_LAR);
 		if (get_num_cpus() == 4) {
 			writel(rst, CSITE_CPU_DBG2_LAR);
 			writel(rst, CSITE_CPU_DBG3_LAR);
 		}
 	}
 }

 void halt_avp(void)
 {
 	for (;;) {
 		writel((HALT_COP_EVENT_JTAG | HALT_COP_EVENT_IRQ_1 \
 			| HALT_COP_EVENT_FIQ_1 | (FLOW_MODE_STOP<<29)),
 			FLOW_CTLR_HALT_COP_EVENTS);
 	}
 }
	/*
	* Copyright (c) 2010-2012, NVIDIA CORPORATION. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include <common.h>
	#include <asm/io.h>
	#include <asm/arch/clock.h>
	#include <asm/arch/gp_padctrl.h>
	#include <asm/arch/pinmux.h>
	#include <asm/arch/tegra.h>
	#include <asm/arch-tegra/clk_rst.h>
	#include <asm/arch-tegra/pmc.h>
	#include <asm/arch-tegra/scu.h>
	#include "cpu.h"

	int get_num_cpus(void)
	{
	struct apb_misc_gp_ctlr *gp;
	uint rev;

	gp = (struct apb_misc_gp_ctlr *)NV_PA_APB_MISC_GP_BASE;
	rev = (readl(&gp->hidrev) & HIDREV_CHIPID_MASK) >> HIDREV_CHIPID_SHIFT;

	switch (rev) {
	case CHIPID_TEGRA20:
	return 2;
	break;
	case CHIPID_TEGRA30:
	case CHIPID_TEGRA114:
	default:
	return 4;
	break;
	}
	}

	/*
	* Timing tables for each SOC for all four oscillator options.
	*/
	struct clk_pll_table tegra_pll_x_table[TEGRA_SOC_CNT][CLOCK_OSC_FREQ_COUNT] = {
	/* T20: 1 GHz */
	/* n, m, p, cpcon */
	{{ 1000, 13, 0, 12}, /* OSC 13M */
	{ 625, 12, 0, 8}, /* OSC 19.2M */
	{ 1000, 12, 0, 12}, /* OSC 12M */
	{ 1000, 26, 0, 12}, /* OSC 26M */
	},

	/* T25: 1.2 GHz */
	{{ 923, 10, 0, 12},
	{ 750, 12, 0, 8},
	{ 600, 6, 0, 12},
	{ 600, 13, 0, 12},
	},

	/* T30: 1.4 GHz */
	{{ 862, 8, 0, 8},
	{ 583, 8, 0, 4},
	{ 700, 6, 0, 8},
	{ 700, 13, 0, 8},
	},

	/* T114: 1.4 GHz */
	{{ 862, 8, 0, 8},
	{ 583, 8, 0, 4},
	{ 696, 12, 0, 8},
	{ 700, 13, 0, 8},
	},
	};

	void adjust_pllp_out_freqs(void)
	{
	struct clk_rst_ctlr clkrst = (struct clk_rst_ctlr )NV_PA_CLK_RST_BASE;
	struct clk_pll *pll = &clkrst->crc_pll[CLOCK_ID_PERIPH];
	u32 reg;

	/* Set T30 PLLP_OUT1, 2, 3 & 4 freqs to 9.6, 48, 102 & 204MHz */
	reg = readl(&pll->pll_out[0]); /* OUTA, contains OUT2 / OUT1 */
	reg \|= (IN_408_OUT_48_DIVISOR << PLLP_OUT2_RATIO) \| PLLP_OUT2_OVR
	\| (IN_408_OUT_9_6_DIVISOR << PLLP_OUT1_RATIO) \| PLLP_OUT1_OVR;
	writel(reg, &pll->pll_out[0]);

	reg = readl(&pll->pll_out[1]); /* OUTB, contains OUT4 / OUT3 */
	reg \|= (IN_408_OUT_204_DIVISOR << PLLP_OUT4_RATIO) \| PLLP_OUT4_OVR
	\| (IN_408_OUT_102_DIVISOR << PLLP_OUT3_RATIO) \| PLLP_OUT3_OVR;
	writel(reg, &pll->pll_out[1]);
	}

	int pllx_set_rate(struct clk_pll_simple *pll , u32 divn, u32 divm,
	u32 divp, u32 cpcon)
	{
	u32 reg;

	/* If PLLX is already enabled, just return */
	if (readl(&pll->pll_base) & PLL_ENABLE_MASK) {
	debug("pllx_set_rate: PLLX already enabled, returning\n");
	return 0;
	}

	debug(" pllx_set_rate entry\n");

	/* Set BYPASS, m, n and p to PLLX_BASE */
	reg = PLL_BYPASS_MASK \| (divm << PLL_DIVM_SHIFT);
	reg \|= ((divn << PLL_DIVN_SHIFT) \| (divp << PLL_DIVP_SHIFT));
	writel(reg, &pll->pll_base);

	/* Set cpcon to PLLX_MISC */
	reg = (cpcon << PLL_CPCON_SHIFT);

	/* Set dccon to PLLX_MISC if freq > 600MHz */
	if (divn > 600)
	reg \|= (1 << PLL_DCCON_SHIFT);
	writel(reg, &pll->pll_misc);

	/* Enable PLLX */
	reg = readl(&pll->pll_base);
	reg \|= PLL_ENABLE_MASK;

	/* Disable BYPASS */
	reg &= ~PLL_BYPASS_MASK;
	writel(reg, &pll->pll_base);

	/* Set lock_enable to PLLX_MISC */
	reg = readl(&pll->pll_misc);
	reg \|= PLL_LOCK_ENABLE_MASK;
	writel(reg, &pll->pll_misc);

	return 0;
	}

	void init_pllx(void)
	{
	struct clk_rst_ctlr clkrst = (struct clk_rst_ctlr )NV_PA_CLK_RST_BASE;
	struct clk_pll_simple *pll = &clkrst->crc_pll_simple[SIMPLE_PLLX];
	int soc_type, sku_info, chip_sku;
	enum clock_osc_freq osc;
	struct clk_pll_table *sel;

	debug("init_pllx entry\n");

	/* get SOC (chip) type */
	soc_type = tegra_get_chip();
	debug(" init_pllx: SoC = 0x%02X\n", soc_type);

	/* get SKU info */
	sku_info = tegra_get_sku_info();
	debug(" init_pllx: SKU info byte = 0x%02X\n", sku_info);

	/* get chip SKU, combo of the above info */
	chip_sku = tegra_get_chip_sku();
	debug(" init_pllx: Chip SKU = %d\n", chip_sku);

	/* get osc freq */
	osc = clock_get_osc_freq();
	debug(" init_pllx: osc = %d\n", osc);

	/* set pllx */
	sel = &tegra_pll_x_table[chip_sku][osc];
	pllx_set_rate(pll, sel->n, sel->m, sel->p, sel->cpcon);

	/* adjust PLLP_out1-4 on T3x/T114 */
	if (soc_type >= CHIPID_TEGRA30) {
	debug(" init_pllx: adjusting PLLP out freqs\n");
	adjust_pllp_out_freqs();
	}
	}

	void enable_cpu_clock(int enable)
	{
	struct clk_rst_ctlr clkrst = (struct clk_rst_ctlr )NV_PA_CLK_RST_BASE;
	u32 clk;

	/*
	* NOTE:
	* Regardless of whether the request is to enable or disable the CPU
	* clock, every processor in the CPU complex except the master (CPU 0)
	* will have it's clock stopped because the AVP only talks to the
	* master.
	*/

	if (enable) {
	/* Initialize PLLX */
	init_pllx();

	/* Wait until all clocks are stable */
	udelay(PLL_STABILIZATION_DELAY);

	writel(CCLK_BURST_POLICY, &clkrst->crc_cclk_brst_pol);
	writel(SUPER_CCLK_DIVIDER, &clkrst->crc_super_cclk_div);
	}

	/*
	* Read the register containing the individual CPU clock enables and
	* always stop the clocks to CPUs > 0.
	*/
	clk = readl(&clkrst->crc_clk_cpu_cmplx);
	clk \|= 1 << CPU1_CLK_STP_SHIFT;
	if (get_num_cpus() == 4)
	clk \|= (1 << CPU2_CLK_STP_SHIFT) + (1 << CPU3_CLK_STP_SHIFT);

	/* Stop/Unstop the CPU clock */
	clk &= ~CPU0_CLK_STP_MASK;
	clk \|= !enable << CPU0_CLK_STP_SHIFT;
	writel(clk, &clkrst->crc_clk_cpu_cmplx);

	clock_enable(PERIPH_ID_CPU);
	}

	static int is_cpu_powered(void)
	{
	struct pmc_ctlr pmc = (struct pmc_ctlr )NV_PA_PMC_BASE;

	return (readl(&pmc->pmc_pwrgate_status) & CPU_PWRED) ? 1 : 0;
	}

	static void remove_cpu_io_clamps(void)
	{
	struct pmc_ctlr pmc = (struct pmc_ctlr )NV_PA_PMC_BASE;
	u32 reg;

	/* Remove the clamps on the CPU I/O signals */
	reg = readl(&pmc->pmc_remove_clamping);
	reg \|= CPU_CLMP;
	writel(reg, &pmc->pmc_remove_clamping);

	/* Give I/O signals time to stabilize */
	udelay(IO_STABILIZATION_DELAY);
	}

	void powerup_cpu(void)
	{
	struct pmc_ctlr pmc = (struct pmc_ctlr )NV_PA_PMC_BASE;
	u32 reg;
	int timeout = IO_STABILIZATION_DELAY;

	if (!is_cpu_powered()) {
	/* Toggle the CPU power state (OFF -> ON) */
	reg = readl(&pmc->pmc_pwrgate_toggle);
	reg &= PARTID_CP;
	reg \|= START_CP;
	writel(reg, &pmc->pmc_pwrgate_toggle);

	/* Wait for the power to come up */
	while (!is_cpu_powered()) {
	if (timeout-- == 0)
	printf("CPU failed to power up!\n");
	else
	udelay(10);
	}

	/*
	* Remove the I/O clamps from CPU power partition.
	* Recommended only on a Warm boot, if the CPU partition gets
	* power gated. Shouldn't cause any harm when called after a
	* cold boot according to HW, probably just redundant.
	*/
	remove_cpu_io_clamps();
	}
	}

	void reset_A9_cpu(int reset)
	{
	/*
	* NOTE: Regardless of whether the request is to hold the CPU in reset
	* or take it out of reset, every processor in the CPU complex
	* except the master (CPU 0) will be held in reset because the
	* AVP only talks to the master. The AVP does not know that there
	* are multiple processors in the CPU complex.
	*/
	int mask = crc_rst_cpu \| crc_rst_de \| crc_rst_debug;
	int num_cpus = get_num_cpus();
	int cpu;

	debug("reset_a9_cpu entry\n");
	/* Hold CPUs 1 onwards in reset, and CPU 0 if asked */
	for (cpu = 1; cpu < num_cpus; cpu++)
	reset_cmplx_set_enable(cpu, mask, 1);
	reset_cmplx_set_enable(0, mask, reset);

	/* Enable/Disable master CPU reset */
	reset_set_enable(PERIPH_ID_CPU, reset);
	}

	void clock_enable_coresight(int enable)
	{
	u32 rst, src = 2;
	int soc_type;

	debug("clock_enable_coresight entry\n");
	clock_set_enable(PERIPH_ID_CORESIGHT, enable);
	reset_set_enable(PERIPH_ID_CORESIGHT, !enable);

	if (enable) {
	/*
	* Put CoreSight on PLLP_OUT0 and divide it down as per
	* PLLP base frequency based on SoC type (T20/T30/T114).
	* Clock divider request would setup CSITE clock as 144MHz
	* for PLLP base 216MHz and 204MHz for PLLP base 408MHz
	*/

	soc_type = tegra_get_chip();
	if (soc_type == CHIPID_TEGRA30 \|\| soc_type == CHIPID_TEGRA114)
	src = CLK_DIVIDER(NVBL_PLLP_KHZ, 204000);
	else if (soc_type == CHIPID_TEGRA20)
	src = CLK_DIVIDER(NVBL_PLLP_KHZ, 144000);
	else
	printf("%s: Unknown SoC type %X!\n",
	__func__, soc_type);

	clock_ll_set_source_divisor(PERIPH_ID_CSI, 0, src);

	/* Unlock the CPU CoreSight interfaces */
	rst = CORESIGHT_UNLOCK;
	writel(rst, CSITE_CPU_DBG0_LAR);
	writel(rst, CSITE_CPU_DBG1_LAR);
	if (get_num_cpus() == 4) {
	writel(rst, CSITE_CPU_DBG2_LAR);
	writel(rst, CSITE_CPU_DBG3_LAR);
	}
	}
	}

	void halt_avp(void)
	{
	for (;;) {
	writel((HALT_COP_EVENT_JTAG \| HALT_COP_EVENT_IRQ_1 \
	\| HALT_COP_EVENT_FIQ_1 \| (FLOW_MODE_STOP<<29)),
	FLOW_CTLR_HALT_COP_EVENTS);
	}
	}