tegra20: move tegra20 SoC code to arch/arm/cpu/tegra20-common

In preparation for splitting out the armv4t code from tegra20, move
the tegra20 SoC code to arch/arm/cpu/tegra20-common.  This code will
be compiled armv4t for the arm7tdmi and armv7 for the cortex A9.

Signed-off-by: Allen Martin <amartin@nvidia.com>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Tested-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Tom Warren <twarren@nvidia.com>

1 files changed, 250 insertions, 0 deletions

diff --git a/arch/arm/cpu/tegra20-common/warmboot_avp.c b/arch/arm/cpu/tegra20-common/warmboot_avp.c
new file mode 100644
index 0000000000..cd01908a46
--- /dev/null
+++ b/arch/arm/cpu/tegra20-common/warmboot_avp.c
@@ -0,0 +1,250 @@
+/*
+ * (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
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/ap20.h>
+#include <asm/arch/clk_rst.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/flow.h>
+#include <asm/arch/pinmux.h>
+#include <asm/arch/pmc.h>
+#include <asm/arch/tegra20.h>
+#include <asm/arch/warmboot.h>
+#include "warmboot_avp.h"
+
+#define DEBUG_RESET_CORESIGHT
+
+void wb_start(void)
+{
+	struct pmux_tri_ctlr *pmt = (struct pmux_tri_ctlr *)NV_PA_APB_MISC_BASE;
+	struct pmc_ctlr *pmc = (struct pmc_ctlr *)TEGRA20_PMC_BASE;
+	struct flow_ctlr *flow = (struct flow_ctlr *)NV_PA_FLOW_BASE;
+	struct clk_rst_ctlr *clkrst =
+			(struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
+	union osc_ctrl_reg osc_ctrl;
+	union pllx_base_reg pllx_base;
+	union pllx_misc_reg pllx_misc;
+	union scratch3_reg scratch3;
+	u32 reg;
+
+	/* enable JTAG & TBE */
+	writel(CONFIG_CTL_TBE | CONFIG_CTL_JTAG, &pmt->pmt_cfg_ctl);
+
+	/* Are we running where we're supposed to be? */
+	asm volatile (
+		"adr	%0, wb_start;"	/* reg: wb_start address */
+		: "=r"(reg)		/* output */
+					/* no input, no clobber list */
+	);
+
+	if (reg != AP20_WB_RUN_ADDRESS)
+		goto do_reset;
+
+	/* Are we running with AVP? */
+	if (readl(NV_PA_PG_UP_BASE + PG_UP_TAG_0) != PG_UP_TAG_AVP)
+		goto do_reset;
+
+#ifdef DEBUG_RESET_CORESIGHT
+	/* Assert CoreSight reset */
+	reg = readl(&clkrst->crc_rst_dev[TEGRA_DEV_U]);
+	reg |= SWR_CSITE_RST;
+	writel(reg, &clkrst->crc_rst_dev[TEGRA_DEV_U]);
+#endif
+
+	/* TODO: Set the drive strength - maybe make this a board parameter? */
+	osc_ctrl.word = readl(&clkrst->crc_osc_ctrl);
+	osc_ctrl.xofs = 4;
+	osc_ctrl.xoe = 1;
+	writel(osc_ctrl.word, &clkrst->crc_osc_ctrl);
+
+	/* Power up the CPU complex if necessary */
+	if (!(readl(&pmc->pmc_pwrgate_status) & PWRGATE_STATUS_CPU)) {
+		reg = PWRGATE_TOGGLE_PARTID_CPU | PWRGATE_TOGGLE_START;
+		writel(reg, &pmc->pmc_pwrgate_toggle);
+		while (!(readl(&pmc->pmc_pwrgate_status) & PWRGATE_STATUS_CPU))
+			;
+	}
+
+	/* Remove the I/O clamps from the CPU power partition. */
+	reg = readl(&pmc->pmc_remove_clamping);
+	reg |= CPU_CLMP;
+	writel(reg, &pmc->pmc_remove_clamping);
+
+	reg = EVENT_ZERO_VAL_20 | EVENT_MSEC | EVENT_MODE_STOP;
+	writel(reg, &flow->halt_cop_events);
+
+	/* Assert CPU complex reset */
+	reg = readl(&clkrst->crc_rst_dev[TEGRA_DEV_L]);
+	reg |= CPU_RST;
+	writel(reg, &clkrst->crc_rst_dev[TEGRA_DEV_L]);
+
+	/* Hold both CPUs in reset */
+	reg = CPU_CMPLX_CPURESET0 | CPU_CMPLX_CPURESET1 | CPU_CMPLX_DERESET0 |
+	      CPU_CMPLX_DERESET1 | CPU_CMPLX_DBGRESET0 | CPU_CMPLX_DBGRESET1;
+	writel(reg, &clkrst->crc_cpu_cmplx_set);
+
+	/* Halt CPU1 at the flow controller for uni-processor configurations */
+	writel(EVENT_MODE_STOP, &flow->halt_cpu1_events);
+
+	/*
+	 * Set the CPU reset vector. SCRATCH41 contains the physical
+	 * address of the CPU-side restoration code.
+	 */
+	reg = readl(&pmc->pmc_scratch41);
+	writel(reg, EXCEP_VECTOR_CPU_RESET_VECTOR);
+
+	/* Select CPU complex clock source */
+	writel(CCLK_PLLP_BURST_POLICY, &clkrst->crc_cclk_brst_pol);
+
+	/* Start the CPU0 clock and stop the CPU1 clock */
+	reg = CPU_CMPLX_CPU_BRIDGE_CLKDIV_4 | CPU_CMPLX_CPU0_CLK_STP_RUN |
+	      CPU_CMPLX_CPU1_CLK_STP_STOP;
+	writel(reg, &clkrst->crc_clk_cpu_cmplx);
+
+	/* Enable the CPU complex clock */
+	reg = readl(&clkrst->crc_clk_out_enb[TEGRA_DEV_L]);
+	reg |= CLK_ENB_CPU;
+	writel(reg, &clkrst->crc_clk_out_enb[TEGRA_DEV_L]);
+
+	/* Make sure the resets were held for at least 2 microseconds */
+	reg = readl(TIMER_USEC_CNTR);
+	while (readl(TIMER_USEC_CNTR) <= (reg + 2))
+		;
+
+#ifdef DEBUG_RESET_CORESIGHT
+	/*
+	 * De-assert CoreSight reset.
+	 * NOTE: We're leaving the CoreSight clock on the oscillator for
+	 *	now. It will be restored to its original clock source
+	 *	when the CPU-side restoration code runs.
+	 */
+	reg = readl(&clkrst->crc_rst_dev[TEGRA_DEV_U]);
+	reg &= ~SWR_CSITE_RST;
+	writel(reg, &clkrst->crc_rst_dev[TEGRA_DEV_U]);
+#endif
+
+	/* Unlock the CPU CoreSight interfaces */
+	reg = 0xC5ACCE55;
+	writel(reg, CSITE_CPU_DBG0_LAR);
+	writel(reg, CSITE_CPU_DBG1_LAR);
+
+	/*
+	 * Sample the microsecond timestamp again. This is the time we must
+	 * use when returning from LP0 for PLL stabilization delays.
+	 */
+	reg = readl(TIMER_USEC_CNTR);
+	writel(reg, &pmc->pmc_scratch1);
+
+	pllx_base.word = 0;
+	pllx_misc.word = 0;
+	scratch3.word = readl(&pmc->pmc_scratch3);
+
+	/* Get the OSC. For 19.2 MHz, use 19 to make the calculations easier */
+	reg = (readl(TIMER_USEC_CFG) & USEC_CFG_DIVISOR_MASK) + 1;
+
+	/*
+	 * According to the TRM, for 19.2MHz OSC, the USEC_DIVISOR is 0x5f, and
+	 * USEC_DIVIDEND is 0x04. So, if USEC_DIVISOR > 26, OSC is 19.2 MHz.
+	 *
+	 * reg is used to calculate the pllx freq, which is used to determine if
+	 * to set dccon or not.
+	 */
+	if (reg > 26)
+		reg = 19;
+
+	/* PLLX_BASE.PLLX_DIVM */
+	if (scratch3.pllx_base_divm == reg)
+		reg = 0;
+	else
+		reg = 1;
+
+	/* PLLX_BASE.PLLX_DIVN */
+	pllx_base.divn = scratch3.pllx_base_divn;
+	reg = scratch3.pllx_base_divn << reg;
+
+	/* PLLX_BASE.PLLX_DIVP */
+	pllx_base.divp = scratch3.pllx_base_divp;
+	reg = reg >> scratch3.pllx_base_divp;
+
+	pllx_base.bypass = 1;
+
+	/* PLLX_MISC_DCCON must be set for pllx frequency > 600 MHz. */
+	if (reg > 600)
+		pllx_misc.dccon = 1;
+
+	/* PLLX_MISC_LFCON */
+	pllx_misc.lfcon = scratch3.pllx_misc_lfcon;
+
+	/* PLLX_MISC_CPCON */
+	pllx_misc.cpcon = scratch3.pllx_misc_cpcon;
+
+	writel(pllx_misc.word, &clkrst->crc_pll_simple[SIMPLE_PLLX].pll_misc);
+	writel(pllx_base.word, &clkrst->crc_pll_simple[SIMPLE_PLLX].pll_base);
+
+	pllx_base.enable = 1;
+	writel(pllx_base.word, &clkrst->crc_pll_simple[SIMPLE_PLLX].pll_base);
+	pllx_base.bypass = 0;
+	writel(pllx_base.word, &clkrst->crc_pll_simple[SIMPLE_PLLX].pll_base);
+
+	writel(0, flow->halt_cpu_events);
+
+	reg = CPU_CMPLX_CPURESET0 | CPU_CMPLX_DBGRESET0 | CPU_CMPLX_DERESET0;
+	writel(reg, &clkrst->crc_cpu_cmplx_clr);
+
+	reg = PLLM_OUT1_RSTN_RESET_DISABLE | PLLM_OUT1_CLKEN_ENABLE |
+	      PLLM_OUT1_RATIO_VAL_8;
+	writel(reg, &clkrst->crc_pll[CLOCK_ID_MEMORY].pll_out);
+
+	reg = SCLK_SWAKE_FIQ_SRC_PLLM_OUT1 | SCLK_SWAKE_IRQ_SRC_PLLM_OUT1 |
+	      SCLK_SWAKE_RUN_SRC_PLLM_OUT1 | SCLK_SWAKE_IDLE_SRC_PLLM_OUT1 |
+	      SCLK_SYS_STATE_IDLE;
+	writel(reg, &clkrst->crc_sclk_brst_pol);
+
+	/* avp_resume: no return after the write */
+	reg = readl(&clkrst->crc_rst_dev[TEGRA_DEV_L]);
+	reg &= ~CPU_RST;
+	writel(reg, &clkrst->crc_rst_dev[TEGRA_DEV_L]);
+
+	/* avp_halt: */
+avp_halt:
+	reg = EVENT_MODE_STOP | EVENT_JTAG;
+	writel(reg, flow->halt_cop_events);
+	goto avp_halt;
+
+do_reset:
+	/*
+	 * Execution comes here if something goes wrong. The chip is reset and
+	 * a cold boot is performed.
+	 */
+	writel(SWR_TRIG_SYS_RST, &clkrst->crc_rst_dev[TEGRA_DEV_L]);
+	goto do_reset;
+}
+
+/*
+ * wb_end() is a dummy function, and must be directly following wb_start(),
+ * and is used to calculate the size of wb_start().
+ */
+void wb_end(void)
+{
+}