*
* 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
+ * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
-#include <asm/arch/emif.h>
-#include <asm/arch/clocks.h>
+#include <asm/emif.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, ®s);
- 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);
-}
+#ifndef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS
+u32 *const T_num = (u32 *)OMAP_SRAM_SCRATCH_EMIF_T_NUM;
+u32 *const T_den = (u32 *)OMAP_SRAM_SCRATCH_EMIF_T_DEN;
+#endif
+
+#ifdef CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS
+/* Base AC Timing values specified by JESD209-2 for 400MHz operation */
+static const struct lpddr2_ac_timings timings_jedec_400_mhz = {
+ .max_freq = 400000000,
+ .RL = 6,
+ .tRPab = 21,
+ .tRCD = 18,
+ .tWR = 15,
+ .tRASmin = 42,
+ .tRRD = 10,
+ .tWTRx2 = 15,
+ .tXSR = 140,
+ .tXPx2 = 15,
+ .tRFCab = 130,
+ .tRTPx2 = 15,
+ .tCKE = 3,
+ .tCKESR = 15,
+ .tZQCS = 90,
+ .tZQCL = 360,
+ .tZQINIT = 1000,
+ .tDQSCKMAXx2 = 11,
+ .tRASmax = 70,
+ .tFAW = 50
+};
+
+/* Base AC Timing values specified by JESD209-2 for 200 MHz operation */
+static const struct lpddr2_ac_timings timings_jedec_200_mhz = {
+ .max_freq = 200000000,
+ .RL = 3,
+ .tRPab = 21,
+ .tRCD = 18,
+ .tWR = 15,
+ .tRASmin = 42,
+ .tRRD = 10,
+ .tWTRx2 = 20,
+ .tXSR = 140,
+ .tXPx2 = 15,
+ .tRFCab = 130,
+ .tRTPx2 = 15,
+ .tCKE = 3,
+ .tCKESR = 15,
+ .tZQCS = 90,
+ .tZQCL = 360,
+ .tZQINIT = 1000,
+ .tDQSCKMAXx2 = 11,
+ .tRASmax = 70,
+ .tFAW = 50
+};
/*
- * 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
+ * Min tCK values specified by JESD209-2
+ * Min tCK specifies the minimum duration of some AC timing parameters in terms
+ * of the number of cycles. If the calculated number of cycles based on the
+ * absolute time value is less than the min tCK value, min tCK value should
+ * be used instead. This typically happens at low frequencies.
*/
-void sdram_init(void)
+static const struct lpddr2_min_tck min_tck_jedec = {
+ .tRL = 3,
+ .tRP_AB = 3,
+ .tRCD = 3,
+ .tWR = 3,
+ .tRAS_MIN = 3,
+ .tRRD = 2,
+ .tWTR = 2,
+ .tXP = 2,
+ .tRTP = 2,
+ .tCKE = 3,
+ .tCKESR = 3,
+ .tFAW = 8
+};
+
+static const struct lpddr2_ac_timings const*
+ jedec_ac_timings[MAX_NUM_SPEEDBINS] = {
+ &timings_jedec_200_mhz,
+ &timings_jedec_400_mhz
+};
+
+static const struct lpddr2_device_timings jedec_default_timings = {
+ .ac_timings = jedec_ac_timings,
+ .min_tck = &min_tck_jedec
+};
+
+void emif_get_device_timings(u32 emif_nr,
+ const struct lpddr2_device_timings **cs0_device_timings,
+ const struct lpddr2_device_timings **cs1_device_timings)
{
- 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");
+ /* Assume Identical devices on EMIF1 & EMIF2 */
+ *cs0_device_timings = &jedec_default_timings;
+ *cs1_device_timings = &jedec_default_timings;
}
+#endif /* CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS */
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