arm, davinci: add lowlevel function for dm365 soc

used for booting (for example) from NAND using spl code.

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Cc: Sandeep Paulraj <s-paulraj@ti.com>
Cc: Christian Riesch <christian.riesch@omicron.at>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

1 files changed, 439 insertions, 0 deletions

diff --git a/arch/arm/cpu/arm926ejs/davinci/dm365_lowlevel.c b/arch/arm/cpu/arm926ejs/davinci/dm365_lowlevel.c
new file mode 100644
index 0000000..3772e64
--- /dev/null
+++ b/arch/arm/cpu/arm926ejs/davinci/dm365_lowlevel.c
@@ -0,0 +1,439 @@
+/*
+ * SoC-specific lowlevel code for tms320dm365 and similar chips
+ * Actually used for booting from NAND with nand_spl.
+ *
+ * Copyright (C) 2011
+ * Heiko Schocher, DENX Software Engineering, hs@denx.de.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <common.h>
+#include <nand.h>
+#include <ns16550.h>
+#include <post.h>
+#include <asm/arch/dm365_lowlevel.h>
+#include <asm/arch/hardware.h>
+
+void dm365_waitloop(unsigned long loopcnt)
+{
+	unsigned long	i;
+
+	for (i = 0; i < loopcnt; i++)
+		asm("   NOP");
+}
+
+int dm365_pll1_init(unsigned long pllmult, unsigned long prediv)
+{
+	unsigned int clksrc = 0x0;
+
+	/* Power up the PLL */
+	clrbits_le32(&dv_pll0_regs->pllctl, PLLCTL_PLLPWRDN);
+
+	clrbits_le32(&dv_pll0_regs->pllctl, PLLCTL_RES_9);
+	setbits_le32(&dv_pll0_regs->pllctl, clksrc << 8);
+
+	/*
+	 * Set PLLENSRC '0', PLL Enable(PLLEN) selection is controlled
+	 * through MMR
+	 */
+	clrbits_le32(&dv_pll0_regs->pllctl, PLLCTL_PLLENSRC);
+
+	/* Set PLLEN=0 => PLL BYPASS MODE */
+	clrbits_le32(&dv_pll0_regs->pllctl, PLLCTL_PLLEN);
+
+	dm365_waitloop(150);
+
+	 /* PLLRST=1(reset assert) */
+	setbits_le32(&dv_pll0_regs->pllctl, PLLCTL_PLLRST);
+
+	dm365_waitloop(300);
+
+	/*Bring PLL out of Reset*/
+	clrbits_le32(&dv_pll0_regs->pllctl, PLLCTL_PLLRST);
+
+	/* Program the Multiper and Pre-Divider for PLL1 */
+	writel(pllmult, &dv_pll0_regs->pllm);
+	writel(prediv, &dv_pll0_regs->prediv);
+
+	/* Assert TENABLE = 1, TENABLEDIV = 1, TINITZ = 1 */
+	writel(PLLSECCTL_STOPMODE | PLLSECCTL_TENABLEDIV | PLLSECCTL_TENABLE |
+		PLLSECCTL_TINITZ, &dv_pll0_regs->secctl);
+	/* Assert TENABLE = 1, TENABLEDIV = 1, TINITZ = 0 */
+	writel(PLLSECCTL_STOPMODE | PLLSECCTL_TENABLEDIV | PLLSECCTL_TENABLE,
+		&dv_pll0_regs->secctl);
+	/* Assert TENABLE = 0, TENABLEDIV = 0, TINITZ = 0 */
+	writel(PLLSECCTL_STOPMODE, &dv_pll0_regs->secctl);
+	/* Assert TENABLE = 0, TENABLEDIV = 0, TINITZ = 1 */
+	writel(PLLSECCTL_STOPMODE | PLLSECCTL_TINITZ, &dv_pll0_regs->secctl);
+
+	/* Program the PostDiv for PLL1 */
+	writel(0x8000, &dv_pll0_regs->postdiv);
+
+	/* Post divider setting for PLL1 */
+	writel(CONFIG_SYS_DM36x_PLL1_PLLDIV1, &dv_pll0_regs->plldiv1);
+	writel(CONFIG_SYS_DM36x_PLL1_PLLDIV2, &dv_pll0_regs->plldiv2);
+	writel(CONFIG_SYS_DM36x_PLL1_PLLDIV3, &dv_pll0_regs->plldiv3);
+	writel(CONFIG_SYS_DM36x_PLL1_PLLDIV4, &dv_pll0_regs->plldiv4);
+	writel(CONFIG_SYS_DM36x_PLL1_PLLDIV5, &dv_pll0_regs->plldiv5);
+	writel(CONFIG_SYS_DM36x_PLL1_PLLDIV6, &dv_pll0_regs->plldiv6);
+	writel(CONFIG_SYS_DM36x_PLL1_PLLDIV7, &dv_pll0_regs->plldiv7);
+	writel(CONFIG_SYS_DM36x_PLL1_PLLDIV8, &dv_pll0_regs->plldiv8);
+	writel(CONFIG_SYS_DM36x_PLL1_PLLDIV9, &dv_pll0_regs->plldiv9);
+
+	dm365_waitloop(300);
+
+	/* Set the GOSET bit */
+	writel(PLLCMD_GOSET, &dv_pll0_regs->pllcmd); /* Go */
+
+	dm365_waitloop(300);
+
+	/* Wait for PLL to LOCK */
+	while (!((readl(&dv_sys_module_regs->pll0_config) & PLL0_LOCK)
+		== PLL0_LOCK))
+		;
+
+	/* Enable the PLL Bit of PLLCTL*/
+	setbits_le32(&dv_pll0_regs->pllctl, PLLCTL_PLLEN);
+
+	return 0;
+}
+
+int dm365_pll2_init(unsigned long pllm, unsigned long prediv)
+{
+	unsigned int clksrc = 0x0;
+
+	/* Power up the PLL*/
+	clrbits_le32(&dv_pll1_regs->pllctl, PLLCTL_PLLPWRDN);
+
+	/*
+	 * Select the Clock Mode as Onchip Oscilator or External Clock on
+	 * MXI pin
+	 * VDB has input on MXI pin
+	 */
+	clrbits_le32(&dv_pll1_regs->pllctl, PLLCTL_RES_9);
+	setbits_le32(&dv_pll1_regs->pllctl, clksrc << 8);
+
+	/*
+	 * Set PLLENSRC '0', PLL Enable(PLLEN) selection is controlled
+	 * through MMR
+	 */
+	clrbits_le32(&dv_pll1_regs->pllctl, PLLCTL_PLLENSRC);
+
+	/* Set PLLEN=0 => PLL BYPASS MODE */
+	clrbits_le32(&dv_pll1_regs->pllctl, PLLCTL_PLLEN);
+
+	dm365_waitloop(50);
+
+	 /* PLLRST=1(reset assert) */
+	setbits_le32(&dv_pll1_regs->pllctl, PLLCTL_PLLRST);
+
+	dm365_waitloop(300);
+
+	/* Bring PLL out of Reset */
+	clrbits_le32(&dv_pll1_regs->pllctl, PLLCTL_PLLRST);
+
+	/* Program the Multiper and Pre-Divider for PLL2 */
+	writel(pllm, &dv_pll1_regs->pllm);
+	writel(prediv, &dv_pll1_regs->prediv);
+
+	writel(0x8000, &dv_pll1_regs->postdiv);
+
+	/* Assert TENABLE = 1, TENABLEDIV = 1, TINITZ = 1 */
+	writel(PLLSECCTL_STOPMODE | PLLSECCTL_TENABLEDIV | PLLSECCTL_TENABLE |
+		PLLSECCTL_TINITZ, &dv_pll1_regs->secctl);
+	/* Assert TENABLE = 1, TENABLEDIV = 1, TINITZ = 0 */
+	writel(PLLSECCTL_STOPMODE | PLLSECCTL_TENABLEDIV | PLLSECCTL_TENABLE,
+		&dv_pll1_regs->secctl);
+	/* Assert TENABLE = 0, TENABLEDIV = 0, TINITZ = 0 */
+	writel(PLLSECCTL_STOPMODE, &dv_pll1_regs->secctl);
+	/* Assert TENABLE = 0, TENABLEDIV = 0, TINITZ = 1 */
+	writel(PLLSECCTL_STOPMODE | PLLSECCTL_TINITZ, &dv_pll1_regs->secctl);
+
+	/* Post divider setting for PLL2 */
+	writel(CONFIG_SYS_DM36x_PLL2_PLLDIV1, &dv_pll1_regs->plldiv1);
+	writel(CONFIG_SYS_DM36x_PLL2_PLLDIV2, &dv_pll1_regs->plldiv2);
+	writel(CONFIG_SYS_DM36x_PLL2_PLLDIV3, &dv_pll1_regs->plldiv3);
+	writel(CONFIG_SYS_DM36x_PLL2_PLLDIV4, &dv_pll1_regs->plldiv4);
+	writel(CONFIG_SYS_DM36x_PLL2_PLLDIV5, &dv_pll1_regs->plldiv5);
+
+	/* GoCmd for PostDivider to take effect */
+	writel(PLLCMD_GOSET, &dv_pll1_regs->pllcmd);
+
+	dm365_waitloop(150);
+
+	/* Wait for PLL to LOCK */
+	while (!((readl(&dv_sys_module_regs->pll1_config) & PLL1_LOCK)
+		== PLL1_LOCK))
+		;
+
+	dm365_waitloop(4100);
+
+	/* Enable the PLL2 */
+	setbits_le32(&dv_pll1_regs->pllctl, PLLCTL_PLLEN);
+
+	/* do this after PLL's have been set up */
+	writel(CONFIG_SYS_DM36x_PERI_CLK_CTRL,
+		&dv_sys_module_regs->peri_clkctl);
+
+	return 0;
+}
+
+int dm365_ddr_setup(void)
+{
+	lpsc_on(DAVINCI_LPSC_DDR_EMIF);
+	clrbits_le32(&dv_sys_module_regs->vtpiocr,
+		VPTIO_IOPWRDN | VPTIO_CLRZ | VPTIO_LOCK | VPTIO_PWRDN);
+
+	/* Set bit CLRZ (bit 13) */
+	setbits_le32(&dv_sys_module_regs->vtpiocr, VPTIO_CLRZ);
+
+	/* Check VTP READY Status */
+	while (!(readl(&dv_sys_module_regs->vtpiocr) & VPTIO_RDY))
+		;
+
+	/* Set bit VTP_IOPWRDWN bit 14 for DDR input buffers) */
+	setbits_le32(&dv_sys_module_regs->vtpiocr, VPTIO_IOPWRDN);
+
+	/* Set bit LOCK(bit7) */
+	setbits_le32(&dv_sys_module_regs->vtpiocr, VPTIO_LOCK);
+
+	/*
+	 * Powerdown VTP as it is locked (bit 6)
+	 * Set bit VTP_IOPWRDWN bit 14 for DDR input buffers)
+	 */
+	setbits_le32(&dv_sys_module_regs->vtpiocr,
+		VPTIO_IOPWRDN | VPTIO_PWRDN);
+
+	/* Wait for calibration to complete */
+	dm365_waitloop(150);
+
+	/* Set the DDR2 to synreset, then enable it again */
+	lpsc_syncreset(DAVINCI_LPSC_DDR_EMIF);
+	lpsc_on(DAVINCI_LPSC_DDR_EMIF);
+
+	writel(CONFIG_SYS_DM36x_DDR2_DDRPHYCR, &dv_ddr2_regs_ctrl->ddrphycr);
+
+	/* Program SDRAM Bank Config Register */
+	writel((CONFIG_SYS_DM36x_DDR2_SDBCR | DV_DDR_BOOTUNLOCK),
+		&dv_ddr2_regs_ctrl->sdbcr);
+	writel((CONFIG_SYS_DM36x_DDR2_SDBCR | DV_DDR_TIMUNLOCK),
+		&dv_ddr2_regs_ctrl->sdbcr);
+
+	/* Program SDRAM Timing Control Register1 */
+	writel(CONFIG_SYS_DM36x_DDR2_SDTIMR, &dv_ddr2_regs_ctrl->sdtimr);
+	/* Program SDRAM Timing Control Register2 */
+	writel(CONFIG_SYS_DM36x_DDR2_SDTIMR2, &dv_ddr2_regs_ctrl->sdtimr2);
+
+	writel(CONFIG_SYS_DM36x_DDR2_PBBPR, &dv_ddr2_regs_ctrl->pbbpr);
+
+	writel(CONFIG_SYS_DM36x_DDR2_SDBCR, &dv_ddr2_regs_ctrl->sdbcr);
+
+	/* Program SDRAM Refresh Control Register */
+	writel(CONFIG_SYS_DM36x_DDR2_SDRCR, &dv_ddr2_regs_ctrl->sdrcr);
+
+	lpsc_syncreset(DAVINCI_LPSC_DDR_EMIF);
+	lpsc_on(DAVINCI_LPSC_DDR_EMIF);
+
+	return 0;
+}
+
+void dm365_vpss_sync_reset(void)
+{
+	unsigned int PdNum = 0;
+
+	/* VPSS_CLKMD 1:1 */
+	setbits_le32(&dv_sys_module_regs->vpss_clkctl,
+		VPSS_CLK_CTL_VPSS_CLKMD);
+
+	/* LPSC SyncReset DDR Clock Enable */
+	writel(((readl(&dv_psc_regs->mdctl[47]) & ~PSC_MD_STATE_MSK) |
+		PSC_SYNCRESET), &dv_psc_regs->mdctl[47]);
+
+	writel((1 << PdNum), &dv_psc_regs->ptcmd);
+
+	while (!(((readl(&dv_psc_regs->ptstat) >> PdNum) & PSC_GOSTAT) == 0))
+		;
+	while (!((readl(&dv_psc_regs->mdstat[47]) &  PSC_MD_STATE_MSK) ==
+		PSC_SYNCRESET))
+		;
+}
+
+void dm365_por_reset(void)
+{
+	if (readl(&dv_pll0_regs->rstype) & 3)
+		dm365_vpss_sync_reset();
+}
+
+void dm365_psc_init(void)
+{
+	unsigned char i = 0;
+	unsigned char lpsc_start;
+	unsigned char lpsc_end, lpscgroup, lpscmin, lpscmax;
+	unsigned int  PdNum = 0;
+
+	lpscmin = 0;
+	lpscmax = 2;
+
+	for (lpscgroup = lpscmin; lpscgroup <= lpscmax; lpscgroup++) {
+		if (lpscgroup == 0) {
+			lpsc_start = 0; /* Enabling LPSC 3 to 28 SCR first */
+			lpsc_end   = 28;
+		} else if (lpscgroup == 1) { /* Skip locked LPSCs [29-37] */
+			lpsc_start = 38;
+			lpsc_end   = 47;
+		} else {
+			lpsc_start = 50;
+			lpsc_end   = 51;
+		}
+
+		/* NEXT=0x3, Enable LPSC's */
+		for (i = lpsc_start; i <= lpsc_end; i++)
+			setbits_le32(&dv_psc_regs->mdctl[i], 0x3);
+
+		/*
+		 * Program goctl to start transition sequence for LPSCs
+		 * CSL_PSC_0_REGS->PTCMD = (1<<PdNum); Kick off Power
+		 * Domain 0 Modules
+		 */
+		writel((1 << PdNum), &dv_psc_regs->ptcmd);
+
+		/*
+		 * Wait for GOSTAT = NO TRANSITION from PSC for Powerdomain 0
+		 */
+		while (!(((readl(&dv_psc_regs->ptstat) >> PdNum) & PSC_GOSTAT)
+			== 0))
+			;
+
+		/* Wait for MODSTAT = ENABLE from LPSC's */
+		for (i = lpsc_start; i <= lpsc_end; i++)
+			while (!((readl(&dv_psc_regs->mdstat[i]) &
+				PSC_MD_STATE_MSK) == 0x3))
+				;
+	}
+}
+
+static void dm365_emif_init(void)
+{
+	writel(CONFIG_SYS_DM36x_AWCCR, &davinci_emif_regs->awccr);
+	writel(CONFIG_SYS_DM36x_AB1CR, &davinci_emif_regs->ab1cr);
+
+	setbits_le32(&davinci_emif_regs->nandfcr, 1);
+
+	writel(CONFIG_SYS_DM36x_AB2CR, &davinci_emif_regs->ab2cr);
+
+	return;
+}
+
+void dm365_pinmux_ctl(unsigned long offset, unsigned long mask,
+	unsigned long value)
+{
+	clrbits_le32(&dv_sys_module_regs->pinmux[offset], mask);
+	setbits_le32(&dv_sys_module_regs->pinmux[offset], (mask & value));
+}
+
+__attribute__((weak))
+void board_gpio_init(void)
+{
+	return;
+}
+
+#if defined(CONFIG_POST)
+int post_log(char *format, ...)
+{
+	return 0;
+}
+#endif
+
+void dm36x_lowlevel_init(ulong bootflag)
+{
+	/*
+	 * copied from arch/arm/cpu/arm926ejs/start.S
+	 *
+	 * flush v4 I/D caches
+	 */
+	asm("mov	r0, #0");
+	asm("mcr	p15, 0, r0, c7, c7, 0");	/* flush v3/v4 cache */
+	asm("mcr	p15, 0, r0, c8, c7, 0");	/* flush v4 TLB */
+
+	/*
+	 * disable MMU stuff and caches
+	 */
+	asm("mrc	p15, 0, r0, c1, c0, 0");
+	/* clear bits 13, 9:8 (--V- --RS) */
+	asm("bic	r0, r0, #0x00002300");
+	/* clear bits 7, 2:0 (B--- -CAM) */
+	asm("bic	r0, r0, #0x00000087");
+	/* set bit 2 (A) Align */
+	asm("orr	r0, r0, #0x00000002");
+	/* set bit 12 (I) I-Cache */
+	asm("orr	r0, r0, #0x00001000");
+	asm("mcr	p15, 0, r0, c1, c0, 0");
+
+	/* Mask all interrupts */
+	writel(0x04, &dv_aintc_regs->intctl);
+	writel(0x0, &dv_aintc_regs->eabase);
+	writel(0x0, &dv_aintc_regs->eint0);
+	writel(0x0, &dv_aintc_regs->eint1);
+
+	/* Clear all interrupts */
+	writel(0xffffffff, &dv_aintc_regs->fiq0);
+	writel(0xffffffff, &dv_aintc_regs->fiq1);
+	writel(0xffffffff, &dv_aintc_regs->irq0);
+	writel(0xffffffff, &dv_aintc_regs->irq1);
+
+	/* System PSC setup - enable all */
+	dm365_psc_init();
+
+	/* Setup Pinmux */
+	dm365_pinmux_ctl(0, 0xFFFFFFFF, CONFIG_SYS_DM36x_PINMUX0);
+	dm365_pinmux_ctl(1, 0xFFFFFFFF, CONFIG_SYS_DM36x_PINMUX1);
+	dm365_pinmux_ctl(2, 0xFFFFFFFF, CONFIG_SYS_DM36x_PINMUX2);
+	dm365_pinmux_ctl(3, 0xFFFFFFFF, CONFIG_SYS_DM36x_PINMUX3);
+	dm365_pinmux_ctl(4, 0xFFFFFFFF, CONFIG_SYS_DM36x_PINMUX4);
+
+	/* PLL setup */
+	dm365_pll1_init(CONFIG_SYS_DM36x_PLL1_PLLM,
+		CONFIG_SYS_DM36x_PLL1_PREDIV);
+	dm365_pll2_init(CONFIG_SYS_DM36x_PLL2_PLLM,
+		CONFIG_SYS_DM36x_PLL2_PREDIV);
+
+	/* GPIO setup */
+	board_gpio_init();
+
+	NS16550_init((NS16550_t)(CONFIG_SYS_NS16550_COM1),
+			CONFIG_SYS_NS16550_CLK / 16 / CONFIG_BAUDRATE);
+
+	/*
+	 * Fix Power and Emulation Management Register
+	 * see sprufh2.pdf page 38 Table 22
+	 */
+	writel(0x0000e003, (CONFIG_SYS_NS16550_COM1 + 0x30));
+	puts("ddr init\n");
+	dm365_ddr_setup();
+
+	puts("emif init\n");
+	dm365_emif_init();
+
+#if defined(CONFIG_POST)
+	/*
+	 * Do memory tests, calls arch_memory_failure_handle()
+	 * if error detected.
+	 */
+	memory_post_test(0);
+#endif
+}