arm, davinci, am1808: add lowlevel functions for booting from NOR

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

2 files changed, 429 insertions, 0 deletions

diff --git a/arch/arm/cpu/arm926ejs/davinci/Makefile b/arch/arm/cpu/arm926ejs/davinci/Makefile
index b38623a..0310957 100644
--- a/arch/arm/cpu/arm926ejs/davinci/Makefile
+++ b/arch/arm/cpu/arm926ejs/davinci/Makefile
@@ -28,6 +28,7 @@ include $(TOPDIR)/config.mk
 LIB	= $(obj)lib$(SOC).o
 
 COBJS-y				+= cpu.o timer.o psc.o
+COBJS-$(CONFIG_AM18018_LOWLEVEL)       += am1808_lowlevel.o
 COBJS-$(CONFIG_SOC_DM355)	+= dm355.o
 COBJS-$(CONFIG_SOC_DM365)	+= dm365.o
 COBJS-$(CONFIG_SOC_DM644X)	+= dm644x.o
diff --git a/arch/arm/cpu/arm926ejs/davinci/am1808_lowlevel.c b/arch/arm/cpu/arm926ejs/davinci/am1808_lowlevel.c
new file mode 100644
index 0000000..1ea4a9f
--- /dev/null
+++ b/arch/arm/cpu/arm926ejs/davinci/am1808_lowlevel.c
@@ -0,0 +1,428 @@
+/*
+ * SoC-specific lowlevel code for AM1808 and similar chips
+ *
+ * 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/am1808_lowlevel.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/ddr2_defs.h>
+#include <asm/arch/emif_defs.h>
+
+void am1808_waitloop(unsigned long loopcnt)
+{
+	unsigned long	i;
+
+	for (i = 0; i < loopcnt; i++)
+		asm("   NOP");
+}
+
+int am1808_pll_init(struct davinci_pllc_regs *reg, unsigned long pllmult)
+{
+	if (reg == davinci_pllc0_regs)
+		/* Unlock PLL registers. */
+		clrbits_le32(&davinci_syscfg_regs->cfgchip0, 0x00000010);
+
+	/*
+	 * Set PLLENSRC '0',bit 5, PLL Enable(PLLEN) selection is controlled
+	 * through MMR
+	 */
+	clrbits_le32(&reg->pllctl, 0x00000020);
+	/* PLLCTL.EXTCLKSRC bit 9 should be left at 0 for Freon */
+	clrbits_le32(&reg->pllctl, 0x00000200);
+
+	/* Set PLLEN=0 => PLL BYPASS MODE */
+	clrbits_le32(&reg->pllctl, 0x00000001);
+
+	am1808_waitloop(150);
+
+	if (reg == davinci_pllc0_regs) {
+		/*
+		 * Select the Clock Mode bit 8 as External Clock or On Chip
+		 * Oscilator
+		 */
+		dv_maskbits(&reg->pllctl, 0xFFFFFEFF);
+		setbits_le32(&reg->pllctl, (CONFIG_SYS_DV_CLKMODE << 8));
+	}
+
+	/* Clear PLLRST bit to reset the PLL */
+	clrbits_le32(&reg->pllctl, 0x00000008);
+
+	/* Disable the PLL output */
+	setbits_le32(&reg->pllctl, 0x00000010);
+
+	/* PLL initialization sequence */
+	/*
+	 * Power up the PLL- PWRDN bit set to 0 to bring the PLL out of
+	 * power down bit
+	 */
+	clrbits_le32(&reg->pllctl, 0x00000002);
+
+	/* Enable the PLL from Disable Mode PLLDIS bit to 0 */
+	clrbits_le32(&reg->pllctl, 0x00000010);
+
+	/* Program the required multiplier value in PLLM */
+	writel(pllmult, &reg->pllm);
+
+	/* program the postdiv */
+	if (reg == davinci_pllc0_regs)
+		writel((0x8000 | CONFIG_SYS_AM1808_PLL0_POSTDIV),
+			&reg->postdiv);
+	else
+		writel((0x8000 | CONFIG_SYS_AM1808_PLL1_POSTDIV),
+			&reg->postdiv);
+
+	/*
+	 * Check for the GOSTAT bit in PLLSTAT to clear to 0 to indicate that
+	 * no GO operation is currently in progress
+	 */
+	while ((readl(&reg->pllstat) & 0x1) == 1)
+		;
+
+	if (reg == davinci_pllc0_regs) {
+		writel(CONFIG_SYS_AM1808_PLL0_PLLDIV1, &reg->plldiv1);
+		writel(CONFIG_SYS_AM1808_PLL0_PLLDIV2, &reg->plldiv2);
+		writel(CONFIG_SYS_AM1808_PLL0_PLLDIV3, &reg->plldiv3);
+		writel(CONFIG_SYS_AM1808_PLL0_PLLDIV4, &reg->plldiv4);
+		writel(CONFIG_SYS_AM1808_PLL0_PLLDIV5, &reg->plldiv5);
+		writel(CONFIG_SYS_AM1808_PLL0_PLLDIV6, &reg->plldiv6);
+		writel(CONFIG_SYS_AM1808_PLL0_PLLDIV7, &reg->plldiv7);
+	} else {
+		writel(CONFIG_SYS_AM1808_PLL1_PLLDIV1, &reg->plldiv1);
+		writel(CONFIG_SYS_AM1808_PLL1_PLLDIV2, &reg->plldiv2);
+		writel(CONFIG_SYS_AM1808_PLL1_PLLDIV3, &reg->plldiv3);
+	}
+
+	/*
+	 * Set the GOSET bit in PLLCMD to 1 to initiate a new divider
+	 * transition.
+	 */
+	setbits_le32(&reg->pllcmd, 0x01);
+
+	/*
+	 * Wait for the GOSTAT bit in PLLSTAT to clear to 0
+	 * (completion of phase alignment).
+	 */
+	while ((readl(&reg->pllstat) & 0x1) == 1)
+		;
+
+	/* Wait for PLL to reset properly. See PLL spec for PLL reset time */
+	am1808_waitloop(200);
+
+	/* Set the PLLRST bit in PLLCTL to 1 to bring the PLL out of reset */
+	setbits_le32(&reg->pllctl, 0x00000008);
+
+	/* Wait for PLL to lock. See PLL spec for PLL lock time */
+	am1808_waitloop(2400);
+
+	/*
+	 * Set the PLLEN bit in PLLCTL to 1 to remove the PLL from bypass
+	 * mode
+	 */
+	setbits_le32(&reg->pllctl, 0x00000001);
+
+
+	/*
+	 * clear EMIFA and EMIFB clock source settings, let them
+	 * run off SYSCLK
+	 */
+	if (reg == davinci_pllc0_regs)
+		dv_maskbits(&davinci_syscfg_regs->cfgchip3, 0xFFFFFFF8);
+
+	return 0;
+}
+
+void am1808_lpc_transition(unsigned char pscnum, unsigned char module,
+		unsigned char domain, unsigned char state)
+{
+	struct davinci_psc_regs	*reg;
+	dv_reg_p mdstat, mdctl;
+
+	if (pscnum == 0) {
+		reg = davinci_psc0_regs;
+		mdstat = &reg->psc0.mdstat[module];
+		mdctl = &reg->psc0.mdctl[module];
+	} else {
+		reg = davinci_psc1_regs;
+		mdstat = &reg->psc1.mdstat[module];
+		mdctl = &reg->psc1.mdctl[module];
+	}
+
+	/* Wait for any outstanding transition to complete */
+	while ((readl(&reg->ptstat) & (0x00000001 << domain)))
+		;
+
+	/* If we are already in that state, just return */
+	if ((readl(mdstat) & 0x1F) == state)
+		return;
+
+	/* Perform transition */
+	writel((readl(mdctl) & 0xFFFFFFE0) | state, mdctl);
+	setbits_le32(&reg->ptcmd, (0x00000001 << domain));
+
+	/* Wait for transition to complete */
+	while (readl(&reg->ptstat) & (0x00000001 << domain))
+		;
+
+	/* Wait and verify the state */
+	while ((readl(mdstat) & 0x1F) != state)
+		;
+}
+
+int am1808_ddr_setup(unsigned int freq)
+{
+	unsigned long	tmp;
+
+	/* Enable the Clock to DDR2/mDDR */
+	am1808_lpc_transition(1, 6, 0, PSC_ENABLE);
+
+	tmp = readl(&davinci_syscfg1_regs->vtpio_ctl);
+	if ((tmp & VTP_POWERDWN) == VTP_POWERDWN) {
+		/* Begin VTP Calibration */
+		clrbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_POWERDWN);
+		clrbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_LOCK);
+		setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_CLKRZ);
+		clrbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_CLKRZ);
+		setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_CLKRZ);
+
+		/* Polling READY bit to see when VTP calibration is done */
+		tmp = readl(&davinci_syscfg1_regs->vtpio_ctl);
+		while ((tmp & VTP_READY) != VTP_READY)
+			tmp = readl(&davinci_syscfg1_regs->vtpio_ctl);
+
+		setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_LOCK);
+		setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_POWERDWN);
+
+		setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_IOPWRDWN);
+	}
+
+	writel(CONFIG_SYS_AM1808_DDR2_DDRPHYCR, &dv_ddr2_regs_ctrl->ddrphycr);
+	clrbits_le32(&davinci_syscfg1_regs->ddr_slew,
+		(1 << DDR_SLEW_CMOSEN_BIT));
+
+	setbits_le32(&dv_ddr2_regs_ctrl->sdbcr, DV_DDR_BOOTUNLOCK);
+
+	writel((CONFIG_SYS_AM1808_DDR2_SDBCR & ~0xf0000000) |
+		(readl(&dv_ddr2_regs_ctrl->sdbcr) & 0xf0000000), /*rsv Bytes*/
+		&dv_ddr2_regs_ctrl->sdbcr);
+	writel(CONFIG_SYS_AM1808_DDR2_SDBCR2, &dv_ddr2_regs_ctrl->sdbcr2);
+
+	writel(CONFIG_SYS_AM1808_DDR2_SDTIMR, &dv_ddr2_regs_ctrl->sdtimr);
+	writel(CONFIG_SYS_AM1808_DDR2_SDTIMR2, &dv_ddr2_regs_ctrl->sdtimr2);
+
+	clrbits_le32(&dv_ddr2_regs_ctrl->sdbcr,
+		(1 << DV_DDR_SDCR_TIMUNLOCK_SHIFT));
+
+	/*
+	 * LPMODEN and MCLKSTOPEN must be set!
+	 * Without this bits set, PSC don;t switch states !!
+	 */
+	writel(CONFIG_SYS_AM1808_DDR2_SDRCR |
+		(1 << DV_DDR_SRCR_LPMODEN_SHIFT) |
+		(1 << DV_DDR_SRCR_MCLKSTOPEN_SHIFT),
+		&dv_ddr2_regs_ctrl->sdrcr);
+
+	/* SyncReset the Clock to EMIF3A SDRAM */
+	am1808_lpc_transition(1, 6, 0, PSC_SYNCRESET);
+	/* Enable the Clock to EMIF3A SDRAM */
+	am1808_lpc_transition(1, 6, 0, PSC_ENABLE);
+
+	/* disable self refresh */
+	clrbits_le32(&dv_ddr2_regs_ctrl->sdrcr, 0xc0000000);
+	writel(0x30, &dv_ddr2_regs_ctrl->pbbpr);
+
+	return 0;
+}
+
+static void am1808_set_mdctl(dv_reg_p mdctl)
+{
+	if ((readl(mdctl) & 0x1F) != PSC_ENABLE)
+		writel(((readl(mdctl) & 0xFFFFFFE0) | PSC_ENABLE), mdctl);
+}
+
+void am1808_psc_init(void)
+{
+	struct davinci_psc_regs	*reg;
+	int i;
+
+	/* PSC 0 domain 0 init */
+	reg = davinci_psc0_regs;
+	while ((readl(&reg->ptstat) & 0x00000001))
+		;
+
+	for (i = 3; i <= 4 ; i++)
+		am1808_set_mdctl(&reg->psc0.mdctl[i]);
+
+	for (i = 7; i <= 12 ; i++)
+		am1808_set_mdctl(&reg->psc0.mdctl[i]);
+
+	/* Do Always-On Power Domain Transitions */
+	setbits_le32(&reg->ptcmd, 0x00000001);
+	while (readl(&reg->ptstat) & 0x00000001)
+		;
+
+	/* PSC1, domain 1 init */
+	reg = davinci_psc1_regs;
+	while ((readl(&reg->ptstat) & 0x00000001))
+		;
+
+	am1808_set_mdctl(&reg->psc1.mdctl[3]);
+	am1808_set_mdctl(&reg->psc1.mdctl[6]);
+
+	/* UART1 + UART2 */
+	for (i = 12 ; i <= 13 ; i++)
+		am1808_set_mdctl(&reg->psc1.mdctl[i]);
+
+	am1808_set_mdctl(&reg->psc1.mdctl[26]);
+	am1808_set_mdctl(&reg->psc1.mdctl[31]);
+
+	/* Do Always-On Power Domain Transitions */
+	setbits_le32(&reg->ptcmd, 0x00000001);
+	while (readl(&reg->ptstat) & 0x00000001)
+		;
+}
+
+void am1808_pinmux_ctl(unsigned long offset, unsigned long mask,
+	unsigned long value)
+{
+	clrbits_le32(&davinci_syscfg_regs->pinmux[offset], mask);
+	setbits_le32(&davinci_syscfg_regs->pinmux[offset], (mask & value));
+}
+
+__attribute__((weak))
+void board_gpio_init(void)
+{
+	return;
+}
+
+#if defined(CONFIG_NAND_SPL)
+void nand_boot(void)
+{
+	__attribute__((noreturn)) void (*uboot)(void);
+
+	/* copy image from NOR to RAM */
+	memcpy((void *)CONFIG_SYS_NAND_U_BOOT_DST,
+		(void *)CONFIG_SYS_NAND_U_BOOT_OFFS,
+		CONFIG_SYS_NAND_U_BOOT_SIZE);
+
+	/* and jump to it ... */
+	uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START;
+	(*uboot)();
+}
+#endif
+
+#if defined(CONFIG_NAND_SPL)
+void board_init_f(ulong bootflag)
+#else
+int arch_cpu_init(void)
+#endif
+{
+	/*
+	 * 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");
+
+	/* Unlock kick registers */
+	writel(0x83e70b13, &davinci_syscfg_regs->kick0);
+	writel(0x95a4f1e0, &davinci_syscfg_regs->kick1);
+
+	dv_maskbits(&davinci_syscfg_regs->suspsrc,
+		((1 << 27) | (1 << 22) | (1 << 20) | (1 << 5) |	(1 << 16)));
+
+	/* System PSC setup - enable all */
+	am1808_psc_init();
+
+	/* Setup Pinmux */
+	am1808_pinmux_ctl(0, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX0);
+	am1808_pinmux_ctl(1, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX1);
+	am1808_pinmux_ctl(2, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX2);
+	am1808_pinmux_ctl(3, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX3);
+	am1808_pinmux_ctl(4, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX4);
+	am1808_pinmux_ctl(5, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX5);
+	am1808_pinmux_ctl(6, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX6);
+	am1808_pinmux_ctl(7, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX7);
+	am1808_pinmux_ctl(8, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX8);
+	am1808_pinmux_ctl(9, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX9);
+	am1808_pinmux_ctl(10, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX10);
+	am1808_pinmux_ctl(11, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX11);
+	am1808_pinmux_ctl(12, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX12);
+	am1808_pinmux_ctl(13, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX13);
+	am1808_pinmux_ctl(14, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX14);
+	am1808_pinmux_ctl(15, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX15);
+	am1808_pinmux_ctl(16, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX16);
+	am1808_pinmux_ctl(17, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX17);
+	am1808_pinmux_ctl(18, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX18);
+	am1808_pinmux_ctl(19, 0xFFFFFFFF, CONFIG_SYS_AM1808_PINMUX19);
+
+	/* PLL setup */
+	am1808_pll_init(davinci_pllc0_regs, CONFIG_SYS_AM1808_PLL0_PLLM);
+	am1808_pll_init(davinci_pllc1_regs, CONFIG_SYS_AM1808_PLL1_PLLM);
+
+	/* GPIO setup */
+	board_gpio_init();
+
+	/* setup CSn config */
+	writel(CONFIG_SYS_AM1808_CS2CFG, &davinci_emif_regs->ab1cr);
+	writel(CONFIG_SYS_AM1808_CS3CFG, &davinci_emif_regs->ab2cr);
+
+	am1808_lpc_transition(1, 13, 0, PSC_ENABLE);
+	NS16550_init((NS16550_t)(CONFIG_SYS_NS16550_COM1),
+			CONFIG_SYS_NS16550_CLK / 16 / CONFIG_BAUDRATE);
+
+	/*
+	 * Fix Power and Emulation Management Register
+	 * see sprufw3a.pdf page 37 Table 24
+	 */
+	writel(readl((CONFIG_SYS_NS16550_COM1 + 0x30)) | 0x00006001,
+		(CONFIG_SYS_NS16550_COM1 + 0x30));
+#if defined(CONFIG_NAND_SPL)
+	puts("ddr init\n");
+	am1808_ddr_setup(132);
+
+	puts("boot u-boot ...\n");
+
+	nand_boot();
+#else
+	am1808_ddr_setup(132);
+	return 0;
+#endif
+}