1 files changed, 341 insertions, 0 deletions
diff --git a/arch/arm/cpu/arm720t/tegra-common/cpu.c b/arch/arm/cpu/arm720t/tegra-common/cpu.c
new file mode 100644
index 0000000..9294611
--- /dev/null
+++ b/arch/arm/cpu/arm720t/tegra-common/cpu.c
@@ -0,0 +1,341 @@
+/*
+ * 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);
+	}
+}