omap4: add sdram init support

Add support for the SDRAM controller (EMIF).

Signed-off-by: Aneesh V <aneesh@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

4 files changed, 464 insertions, 3 deletions

diff --git a/arch/arm/cpu/armv7/omap4/Makefile b/arch/arm/cpu/armv7/omap4/Makefile
index ac4b2a6119..e1ccd68192 100644
--- a/arch/arm/cpu/armv7/omap4/Makefile
+++ b/arch/arm/cpu/armv7/omap4/Makefile
@@ -29,7 +29,9 @@ SOBJS	+= lowlevel_init.o
 
 COBJS	+= board.o
 COBJS	+= clocks.o
+COBJS	+= emif.o
 COBJS	+= mem.o
+COBJS	+= sdram_elpida.o
 COBJS	+= sys_info.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
diff --git a/arch/arm/cpu/armv7/omap4/board.c b/arch/arm/cpu/armv7/omap4/board.c
index 1c26a66b79..ca107f790f 100644
--- a/arch/arm/cpu/armv7/omap4/board.c
+++ b/arch/arm/cpu/armv7/omap4/board.c
@@ -189,7 +189,7 @@ void watchdog_init(void)
  * This is needed because the size of memory installed may be
  * different on different versions of the board
  */
-u32 sdram_size(void)
+u32 omap4_sdram_size(void)
 {
 	u32 section, i, total_size = 0, size, addr;
 	for (i = 0; i < 4; i++) {
@@ -215,8 +215,8 @@ u32 sdram_size(void)
  */
 int dram_init(void)
 {
-
-	gd->ram_size = sdram_size();
+	sdram_init();
+	gd->ram_size = omap4_sdram_size();
 
 	return 0;
 }
diff --git a/arch/arm/cpu/armv7/omap4/emif.c b/arch/arm/cpu/armv7/omap4/emif.c
new file mode 100644
index 0000000000..b25c1ee8cd
--- /dev/null
+++ b/arch/arm/cpu/armv7/omap4/emif.c
@@ -0,0 +1,328 @@
+/*
+ * EMIF programming
+ *
+ * (C) Copyright 2010
+ * Texas Instruments, <www.ti.com>
+ *
+ * Aneesh V <aneesh@ti.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/arch/emif.h>
+#include <asm/arch/clocks.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/omap_common.h>
+#include <asm/utils.h>
+
+static inline u32 emif_num(u32 base)
+{
+	if (base == OMAP44XX_EMIF1)
+		return 1;
+	else if (base == OMAP44XX_EMIF2)
+		return 2;
+	else
+		return 0;
+}
+
+static inline u32 get_mr(u32 base, u32 cs, u32 mr_addr)
+{
+	u32 mr;
+	struct emif_reg_struct *emif = (struct emif_reg_struct *)base;
+
+	mr_addr |= cs << OMAP44XX_REG_CS_SHIFT;
+	writel(mr_addr, &emif->emif_lpddr2_mode_reg_cfg);
+	if (omap_revision() == OMAP4430_ES2_0)
+		mr = readl(&emif->emif_lpddr2_mode_reg_data_es2);
+	else
+		mr = readl(&emif->emif_lpddr2_mode_reg_data);
+	debug("get_mr: EMIF%d cs %d mr %08x val 0x%x\n", emif_num(base),
+	      cs, mr_addr, mr);
+	return mr;
+}
+
+static inline void set_mr(u32 base, u32 cs, u32 mr_addr, u32 mr_val)
+{
+	struct emif_reg_struct *emif = (struct emif_reg_struct *)base;
+
+	mr_addr |= cs << OMAP44XX_REG_CS_SHIFT;
+	writel(mr_addr, &emif->emif_lpddr2_mode_reg_cfg);
+	writel(mr_val, &emif->emif_lpddr2_mode_reg_data);
+}
+
+void emif_reset_phy(u32 base)
+{
+	struct emif_reg_struct *emif = (struct emif_reg_struct *)base;
+	u32 iodft;
+
+	iodft = readl(&emif->emif_iodft_tlgc);
+	iodft |= OMAP44XX_REG_RESET_PHY_MASK;
+	writel(iodft, &emif->emif_iodft_tlgc);
+}
+
+static void do_lpddr2_init(u32 base, u32 cs)
+{
+	u32 mr_addr;
+
+	/* Wait till device auto initialization is complete */
+	while (get_mr(base, cs, LPDDR2_MR0) & LPDDR2_MR0_DAI_MASK)
+		;
+	set_mr(base, cs, LPDDR2_MR10, MR10_ZQ_ZQINIT);
+	/*
+	 * tZQINIT = 1 us
+	 * Enough loops assuming a maximum of 2GHz
+	 */
+	sdelay(2000);
+	set_mr(base, cs, LPDDR2_MR1, MR1_BL_8_BT_SEQ_WRAP_EN_NWR_3);
+	set_mr(base, cs, LPDDR2_MR16, MR16_REF_FULL_ARRAY);
+	/*
+	 * Enable refresh along with writing MR2
+	 * Encoding of RL in MR2 is (RL - 2)
+	 */
+	mr_addr = LPDDR2_MR2 | OMAP44XX_REG_REFRESH_EN_MASK;
+	set_mr(base, cs, mr_addr, RL_FINAL - 2);
+}
+
+static void lpddr2_init(u32 base, const struct emif_regs *regs)
+{
+	struct emif_reg_struct *emif = (struct emif_reg_struct *)base;
+
+	/* Not NVM */
+	clrbits_le32(&emif->emif_lpddr2_nvm_config, OMAP44XX_REG_CS1NVMEN_MASK);
+
+	/*
+	 * Keep REG_INITREF_DIS = 1 to prevent re-initialization of SDRAM
+	 * when EMIF_SDRAM_CONFIG register is written
+	 */
+	setbits_le32(&emif->emif_sdram_ref_ctrl, OMAP44XX_REG_INITREF_DIS_MASK);
+
+	/*
+	 * Set the SDRAM_CONFIG and PHY_CTRL for the
+	 * un-locked frequency & default RL
+	 */
+	writel(regs->sdram_config_init, &emif->emif_sdram_config);
+	writel(regs->emif_ddr_phy_ctlr_1_init, &emif->emif_ddr_phy_ctrl_1);
+
+	do_lpddr2_init(base, CS0);
+	if (regs->sdram_config & OMAP44XX_REG_EBANK_MASK)
+		do_lpddr2_init(base, CS1);
+
+	writel(regs->sdram_config, &emif->emif_sdram_config);
+	writel(regs->emif_ddr_phy_ctlr_1, &emif->emif_ddr_phy_ctrl_1);
+
+	/* Enable refresh now */
+	clrbits_le32(&emif->emif_sdram_ref_ctrl, OMAP44XX_REG_INITREF_DIS_MASK);
+
+}
+
+static void emif_update_timings(u32 base, const struct emif_regs *regs)
+{
+	struct emif_reg_struct *emif = (struct emif_reg_struct *)base;
+
+	writel(regs->ref_ctrl, &emif->emif_sdram_ref_ctrl_shdw);
+	writel(regs->sdram_tim1, &emif->emif_sdram_tim_1_shdw);
+	writel(regs->sdram_tim2, &emif->emif_sdram_tim_2_shdw);
+	writel(regs->sdram_tim3, &emif->emif_sdram_tim_3_shdw);
+	if (omap_revision() == OMAP4430_ES1_0) {
+		/* ES1 bug EMIF should be in force idle during freq_update */
+		writel(0, &emif->emif_pwr_mgmt_ctrl);
+	} else {
+		writel(EMIF_PWR_MGMT_CTRL, &emif->emif_pwr_mgmt_ctrl);
+		writel(EMIF_PWR_MGMT_CTRL_SHDW, &emif->emif_pwr_mgmt_ctrl_shdw);
+	}
+	writel(regs->read_idle_ctrl, &emif->emif_read_idlectrl_shdw);
+	writel(regs->zq_config, &emif->emif_zq_config);
+	writel(regs->temp_alert_config, &emif->emif_temp_alert_config);
+	writel(regs->emif_ddr_phy_ctlr_1, &emif->emif_ddr_phy_ctrl_1_shdw);
+	/*
+	 * Workaround:
+	 * In a specific situation, the OCP interface between the DMM and
+	 * EMIF may hang.
+	 * 1. A TILER port is used to perform 2D burst writes of
+	 *       width 1 and height 8
+	 * 2. ELLAn port is used to perform reads
+	 * 3. All accesses are routed to the same EMIF controller
+	 *
+	 * Work around to avoid this issue REG_SYS_THRESH_MAX value should
+	 * be kept higher than default 0x7. As per recommondation 0x0A will
+	 * be used for better performance with REG_LL_THRESH_MAX = 0x00
+	 */
+	if (omap_revision() == OMAP4430_ES1_0) {
+		writel(EMIF_L3_CONFIG_VAL_SYS_THRESH_0A_LL_THRESH_00,
+		       &emif->emif_l3_config);
+	}
+}
+
+static void do_sdram_init(u32 base)
+{
+	const struct emif_regs *regs;
+	u32 in_sdram, emif_nr;
+
+	debug(">>do_sdram_init() %x\n", base);
+
+	in_sdram = running_from_sdram();
+	emif_nr = (base == OMAP44XX_EMIF1) ? 1 : 2;
+
+	emif_get_reg_dump(emif_nr, &regs);
+	if (!regs) {
+		debug("EMIF: reg dump not provided\n");
+		return;
+	}
+
+	/*
+	 * Initializing the LPDDR2 device can not happen from SDRAM.
+	 * Changing the timing registers in EMIF can happen(going from one
+	 * OPP to another)
+	 */
+	if (!in_sdram)
+		lpddr2_init(base, regs);
+
+	/* Write to the shadow registers */
+	emif_update_timings(base, regs);
+
+	debug("<<do_sdram_init() %x\n", base);
+}
+
+void sdram_init_pads(void)
+{
+	u32 lpddr2io;
+	struct control_lpddr2io_regs *lpddr2io_regs =
+		(struct control_lpddr2io_regs *)LPDDR2_IO_REGS_BASE;
+	u32 omap4_rev = omap_revision();
+
+	if (omap4_rev == OMAP4430_ES1_0)
+		lpddr2io = CONTROL_LPDDR2IO_SLEW_125PS_DRV8_PULL_DOWN;
+	else if (omap4_rev == OMAP4430_ES2_0)
+		lpddr2io = CONTROL_LPDDR2IO_SLEW_325PS_DRV8_GATE_KEEPER;
+	else
+		return;		/* Post ES2.1 reset values will work */
+
+	writel(lpddr2io, &lpddr2io_regs->control_lpddr2io1_0);
+	writel(lpddr2io, &lpddr2io_regs->control_lpddr2io1_1);
+	writel(lpddr2io, &lpddr2io_regs->control_lpddr2io1_2);
+	writel(lpddr2io, &lpddr2io_regs->control_lpddr2io2_0);
+	writel(lpddr2io, &lpddr2io_regs->control_lpddr2io2_1);
+	writel(lpddr2io, &lpddr2io_regs->control_lpddr2io2_2);
+
+	writel(CONTROL_EFUSE_2_NMOS_PMOS_PTV_CODE_1, CONTROL_EFUSE_2);
+}
+
+static void emif_post_init_config(u32 base)
+{
+	struct emif_reg_struct *emif = (struct emif_reg_struct *)base;
+	u32 omap4_rev = omap_revision();
+
+	/* reset phy on ES2.0 */
+	if (omap4_rev == OMAP4430_ES2_0)
+		emif_reset_phy(base);
+
+	/* Put EMIF back in smart idle on ES1.0 */
+	if (omap4_rev == OMAP4430_ES1_0)
+		writel(0x80000000, &emif->emif_pwr_mgmt_ctrl);
+}
+
+static void dmm_init(u32 base)
+{
+	const struct dmm_lisa_map_regs *lisa_map_regs;
+
+	emif_get_dmm_regs(&lisa_map_regs);
+
+	struct dmm_lisa_map_regs *hw_lisa_map_regs =
+	    (struct dmm_lisa_map_regs *)base;
+
+	writel(0, &hw_lisa_map_regs->dmm_lisa_map_3);
+	writel(0, &hw_lisa_map_regs->dmm_lisa_map_2);
+	writel(0, &hw_lisa_map_regs->dmm_lisa_map_1);
+	writel(0, &hw_lisa_map_regs->dmm_lisa_map_0);
+
+	writel(lisa_map_regs->dmm_lisa_map_3,
+		&hw_lisa_map_regs->dmm_lisa_map_3);
+	writel(lisa_map_regs->dmm_lisa_map_2,
+		&hw_lisa_map_regs->dmm_lisa_map_2);
+	writel(lisa_map_regs->dmm_lisa_map_1,
+		&hw_lisa_map_regs->dmm_lisa_map_1);
+	writel(lisa_map_regs->dmm_lisa_map_0,
+		&hw_lisa_map_regs->dmm_lisa_map_0);
+}
+
+/*
+ * SDRAM initialization:
+ * SDRAM initialization has two parts:
+ * 1. Configuring the SDRAM device
+ * 2. Update the AC timings related parameters in the EMIF module
+ * (1) should be done only once and should not be done while we are
+ * running from SDRAM.
+ * (2) can and should be done more than once if OPP changes.
+ * Particularly, this may be needed when we boot without SPL and
+ * and using Configuration Header(CH). ROM code supports only at 50% OPP
+ * at boot (low power boot). So u-boot has to switch to OPP100 and update
+ * the frequency. So,
+ * Doing (1) and (2) makes sense - first time initialization
+ * Doing (2) and not (1) makes sense - OPP change (when using CH)
+ * Doing (1) and not (2) doen't make sense
+ * See do_sdram_init() for the details
+ */
+void sdram_init(void)
+{
+	u32 in_sdram, size_prog, size_detect;
+
+	debug(">>sdram_init()\n");
+
+	if (omap4_hw_init_context() == OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL)
+		return;
+
+	in_sdram = running_from_sdram();
+	debug("in_sdram = %d\n", in_sdram);
+
+	if (!in_sdram) {
+		sdram_init_pads();
+		bypass_dpll(&prcm->cm_clkmode_dpll_core);
+	}
+
+	do_sdram_init(OMAP44XX_EMIF1);
+	do_sdram_init(OMAP44XX_EMIF2);
+
+	if (!in_sdram) {
+		dmm_init(OMAP44XX_DMM_LISA_MAP_BASE);
+		emif_post_init_config(OMAP44XX_EMIF1);
+		emif_post_init_config(OMAP44XX_EMIF2);
+
+	}
+
+	/* for the shadow registers to take effect */
+	freq_update_core();
+
+	/* Do some testing after the init */
+	if (!in_sdram) {
+		size_prog = omap4_sdram_size();
+		size_detect = get_ram_size((long *)CONFIG_SYS_SDRAM_BASE,
+						size_prog);
+		/* Compare with the size programmed */
+		if (size_detect != size_prog) {
+			printf("SDRAM: identified size not same as expected"
+				" size identified: %x expected: %x\n",
+				size_detect,
+				size_prog);
+		} else
+			debug("get_ram_size() successful");
+	}
+
+	debug("<<sdram_init()\n");
+}
diff --git a/arch/arm/cpu/armv7/omap4/sdram_elpida.c b/arch/arm/cpu/armv7/omap4/sdram_elpida.c
new file mode 100644
index 0000000000..c950c87446
--- /dev/null
+++ b/arch/arm/cpu/armv7/omap4/sdram_elpida.c
@@ -0,0 +1,131 @@
+/*
+ * Timing and Organization details of the Elpida parts used in OMAP4
+ * SDPs and Panda
+ *
+ * (C) Copyright 2010
+ * Texas Instruments, <www.ti.com>
+ *
+ * Aneesh V <aneesh@ti.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 <asm/arch/emif.h>
+#include <asm/arch/sys_proto.h>
+
+/*
+ * This file provides details of the LPDDR2 SDRAM parts used on OMAP4430
+ * SDP and Panda. Since the parts used and geometry are identical for
+ * SDP and Panda for a given OMAP4 revision, this information is kept
+ * here instead of being in board directory. However the key functions
+ * exported are weakly linked so that they can be over-ridden in the board
+ * directory if there is a OMAP4 board in the future that uses a different
+ * memory device or geometry.
+ *
+ * For any new board with different memory devices over-ride one or more
+ * of the following functions as per the CONFIG flags you intend to enable:
+ * - emif_get_reg_dump()
+ * - emif_get_dmm_regs()
+ * - emif_get_device_details()
+ * - emif_get_device_timings()
+ */
+
+static const struct emif_regs emif_regs_elpida_200_mhz_2cs = {
+	.sdram_config_init		= 0x80000eb9,
+	.sdram_config			= 0x80001ab9,
+	.ref_ctrl			= 0x0000030c,
+	.sdram_tim1			= 0x08648311,
+	.sdram_tim2			= 0x101b06ca,
+	.sdram_tim3			= 0x0048a19f,
+	.read_idle_ctrl			= 0x000501ff,
+	.zq_config			= 0x500b3214,
+	.temp_alert_config		= 0xd8016893,
+	.emif_ddr_phy_ctlr_1_init	= 0x049ffff5,
+	.emif_ddr_phy_ctlr_1		= 0x049ff808
+};
+
+static const struct emif_regs emif_regs_elpida_380_mhz_1cs = {
+	.sdram_config_init		= 0x80000eb1,
+	.sdram_config			= 0x80001ab1,
+	.ref_ctrl			= 0x000005cd,
+	.sdram_tim1			= 0x10cb0622,
+	.sdram_tim2			= 0x20350d52,
+	.sdram_tim3			= 0x00b1431f,
+	.read_idle_ctrl			= 0x000501ff,
+	.zq_config			= 0x500b3214,
+	.temp_alert_config		= 0x58016893,
+	.emif_ddr_phy_ctlr_1_init	= 0x049ffff5,
+	.emif_ddr_phy_ctlr_1		= 0x049ff418
+};
+
+const struct emif_regs emif_regs_elpida_400_mhz_2cs = {
+	.sdram_config_init		= 0x80000eb9,
+	.sdram_config			= 0x80001ab9,
+	.ref_ctrl			= 0x00000618,
+	.sdram_tim1			= 0x10eb0662,
+	.sdram_tim2			= 0x20370dd2,
+	.sdram_tim3			= 0x00b1c33f,
+	.read_idle_ctrl			= 0x000501ff,
+	.zq_config			= 0xd00b3214,
+	.temp_alert_config		= 0xd8016893,
+	.emif_ddr_phy_ctlr_1_init	= 0x049ffff5,
+	.emif_ddr_phy_ctlr_1		= 0x049ff418
+};
+const struct dmm_lisa_map_regs lisa_map_2G_x_1_x_2 = {
+	.dmm_lisa_map_0 = 0xFF020100,
+	.dmm_lisa_map_1 = 0,
+	.dmm_lisa_map_2 = 0,
+	.dmm_lisa_map_3 = 0x80540300
+};
+
+const struct dmm_lisa_map_regs lisa_map_2G_x_2_x_2 = {
+	.dmm_lisa_map_0 = 0xFF020100,
+	.dmm_lisa_map_1 = 0,
+	.dmm_lisa_map_2 = 0,
+	.dmm_lisa_map_3 = 0x80640300
+};
+
+static void emif_get_reg_dump_sdp(u32 emif_nr, const struct emif_regs **regs)
+{
+	u32 omap4_rev = omap_revision();
+
+	/* Same devices and geometry on both EMIFs */
+	if (omap4_rev == OMAP4430_ES1_0)
+		*regs = &emif_regs_elpida_380_mhz_1cs;
+	else if (omap4_rev == OMAP4430_ES2_0)
+		*regs = &emif_regs_elpida_200_mhz_2cs;
+	else
+		*regs = &emif_regs_elpida_400_mhz_2cs;
+}
+void emif_get_reg_dump(u32 emif_nr, const struct emif_regs **regs)
+	__attribute__((weak, alias("emif_get_reg_dump_sdp")));
+
+static void emif_get_dmm_regs_sdp(const struct dmm_lisa_map_regs
+						**dmm_lisa_regs)
+{
+	u32 omap_rev = omap_revision();
+
+	if (omap_rev == OMAP4430_ES1_0)
+		*dmm_lisa_regs = &lisa_map_2G_x_1_x_2;
+	else
+		*dmm_lisa_regs = &lisa_map_2G_x_2_x_2;
+}
+
+void emif_get_dmm_regs(const struct dmm_lisa_map_regs **dmm_lisa_regs)
+	__attribute__((weak, alias("emif_get_dmm_regs_sdp")));