Tegra30: Add AVP (arm720t) files

This provides SPL support for T30 boards - AVP early init, plus
CPU (A9) init/jump to main U-Boot.

Some changes were made to Tegra20 cpu.c to move common routines
into tegra-common/cpu.c and reduce code duplication.

Signed-off-by: Tom Warren <twarren@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>

1 files changed, 14 insertions, 202 deletions

diff --git a/arch/arm/cpu/arm720t/tegra20/cpu.c b/arch/arm/cpu/arm720t/tegra20/cpu.c
index ef7f375..2533899 100644
--- a/arch/arm/cpu/arm720t/tegra20/cpu.c
+++ b/arch/arm/cpu/arm720t/tegra20/cpu.c
@@ -1,160 +1,25 @@
 /*
-* (C) Copyright 2010-2011
-* NVIDIA Corporation <www.nvidia.com>
-*
-* See file CREDITS for list of people who contributed to this
-* project.
-*
-* This program is free software; you can redistribute it and/or
-* modify it under the terms of the GNU General Public License as
-* published by the Free Software Foundation; either version 2 of
-* the License, or (at your option) any later version.
-*
-* This program is distributed in the hope that 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, write to the Free Software
-* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
-* MA 02111-1307 USA
-*/
+ * 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/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 "../tegra-common/cpu.h"
 
-/* Returns 1 if the current CPU executing is a Cortex-A9, else 0 */
-int ap20_cpu_is_cortexa9(void)
-{
-	u32 id = readb(NV_PA_PG_UP_BASE + PG_UP_TAG_0);
-	return id == (PG_UP_TAG_0_PID_CPU & 0xff);
-}
-
-void init_pllx(void)
-{
-	struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
-	struct clk_pll *pll = &clkrst->crc_pll[CLOCK_ID_XCPU];
-	u32 reg;
-
-	/* If PLLX is already enabled, just return */
-	if (readl(&pll->pll_base) & PLL_ENABLE_MASK)
-		return;
-
-	/* Set PLLX_MISC */
-	writel(1 << PLL_CPCON_SHIFT, &pll->pll_misc);
-
-	/* Use 12MHz clock here */
-	reg = PLL_BYPASS_MASK | (12 << PLL_DIVM_SHIFT);
-	reg |= 1000 << PLL_DIVN_SHIFT;
-	writel(reg, &pll->pll_base);
-
-	reg |= PLL_ENABLE_MASK;
-	writel(reg, &pll->pll_base);
-
-	reg &= ~PLL_BYPASS_MASK;
-	writel(reg, &pll->pll_base);
-}
-
-static 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. The AVP does not know (nor does it need to know) that there
-	 * are multiple processors in the CPU complex.
-	 */
-
-	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 clock to CPU 1.
-	 */
-	clk = readl(&clkrst->crc_clk_cpu_cmplx);
-	clk |= 1 << CPU1_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);
-}
-
-static 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();
-	}
-}
-
 static void enable_cpu_power_rail(void)
 {
 	struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE;
@@ -173,49 +38,6 @@ static void enable_cpu_power_rail(void)
 	udelay(3750);
 }
 
-static 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.
-	*/
-
-	/* Hold CPU 1 in reset, and CPU 0 if asked */
-	reset_cmplx_set_enable(1, crc_rst_cpu | crc_rst_de | crc_rst_debug, 1);
-	reset_cmplx_set_enable(0, crc_rst_cpu | crc_rst_de | crc_rst_debug,
-			       reset);
-
-	/* Enable/Disable master CPU reset */
-	reset_set_enable(PERIPH_ID_CPU, reset);
-}
-
-static void clock_enable_coresight(int enable)
-{
-	u32 rst, src;
-
-	clock_set_enable(PERIPH_ID_CORESIGHT, enable);
-	reset_set_enable(PERIPH_ID_CORESIGHT, !enable);
-
-	if (enable) {
-		/*
-		 * Put CoreSight on PLLP_OUT0 (216 MHz) and divide it down by
-		 *  1.5, giving an effective frequency of 144MHz.
-		 * Set PLLP_OUT0 [bits31:30 = 00], and use a 7.1 divisor
-		 *  (bits 7:0), so 00000001b == 1.5 (n+1 + .5)
-		 */
-		src = CLK_DIVIDER(NVBL_PLLP_KHZ, 144000);
-		clock_ll_set_source_divisor(PERIPH_ID_CSI, 0, src);
-
-		/* Unlock the CPU CoreSight interfaces */
-		rst = 0xC5ACCE55;
-		writel(rst, CSITE_CPU_DBG0_LAR);
-		writel(rst, CSITE_CPU_DBG1_LAR);
-	}
-}
-
 void start_cpu(u32 reset_vector)
 {
 	/* Enable VDD_CPU */
@@ -246,13 +68,3 @@ void start_cpu(u32 reset_vector)
 	/* Take the CPU out of reset */
 	reset_A9_cpu(0);
 }
-
-
-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);
-	}
-}