| Sricharan | bb772a5 | 2011-11-15 09:50:00 -0500 | [diff] [blame^] | 1 | /* |
| 2 | * EMIF programming |
| 3 | * |
| 4 | * (C) Copyright 2010 |
| 5 | * Texas Instruments, <www.ti.com> |
| 6 | * |
| 7 | * Aneesh V <aneesh@ti.com> for OMAP4 |
| 8 | * |
| 9 | * See file CREDITS for list of people who contributed to this |
| 10 | * project. |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License as |
| 14 | * published by the Free Software Foundation; either version 2 of |
| 15 | * the License, or (at your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with this program; if not, write to the Free Software |
| 24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 25 | * MA 02111-1307 USA |
| 26 | */ |
| 27 | |
| 28 | #include <common.h> |
| 29 | #include <asm/emif.h> |
| 30 | #include <asm/arch/sys_proto.h> |
| 31 | #include <asm/utils.h> |
| 32 | |
| 33 | #ifndef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS |
| 34 | #define print_timing_reg(reg) debug(#reg" - 0x%08x\n", (reg)) |
| 35 | static u32 *const T_num = (u32 *)OMAP5_SRAM_SCRATCH_EMIF_T_NUM; |
| 36 | static u32 *const T_den = (u32 *)OMAP5_SRAM_SCRATCH_EMIF_T_DEN; |
| 37 | static u32 *const emif_sizes = (u32 *)OMAP5_SRAM_SCRATCH_EMIF_SIZE; |
| 38 | #endif |
| 39 | |
| 40 | #ifdef CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS |
| 41 | /* Base AC Timing values specified by JESD209-2 for 532MHz operation */ |
| 42 | static const struct lpddr2_ac_timings timings_jedec_532_mhz = { |
| 43 | .max_freq = 532000000, |
| 44 | .RL = 8, |
| 45 | .tRPab = 21, |
| 46 | .tRCD = 18, |
| 47 | .tWR = 15, |
| 48 | .tRASmin = 42, |
| 49 | .tRRD = 10, |
| 50 | .tWTRx2 = 15, |
| 51 | .tXSR = 140, |
| 52 | .tXPx2 = 15, |
| 53 | .tRFCab = 130, |
| 54 | .tRTPx2 = 15, |
| 55 | .tCKE = 3, |
| 56 | .tCKESR = 15, |
| 57 | .tZQCS = 90, |
| 58 | .tZQCL = 360, |
| 59 | .tZQINIT = 1000, |
| 60 | .tDQSCKMAXx2 = 11, |
| 61 | .tRASmax = 70, |
| 62 | .tFAW = 50 |
| 63 | }; |
| 64 | |
| 65 | /* |
| 66 | * Min tCK values specified by JESD209-2 |
| 67 | * Min tCK specifies the minimum duration of some AC timing parameters in terms |
| 68 | * of the number of cycles. If the calculated number of cycles based on the |
| 69 | * absolute time value is less than the min tCK value, min tCK value should |
| 70 | * be used instead. This typically happens at low frequencies. |
| 71 | */ |
| 72 | static const struct lpddr2_min_tck min_tck_jedec = { |
| 73 | .tRL = 3, |
| 74 | .tRP_AB = 3, |
| 75 | .tRCD = 3, |
| 76 | .tWR = 3, |
| 77 | .tRAS_MIN = 3, |
| 78 | .tRRD = 2, |
| 79 | .tWTR = 2, |
| 80 | .tXP = 2, |
| 81 | .tRTP = 2, |
| 82 | .tCKE = 3, |
| 83 | .tCKESR = 3, |
| 84 | .tFAW = 8 |
| 85 | }; |
| 86 | |
| 87 | static const struct lpddr2_ac_timings const* |
| 88 | jedec_ac_timings[MAX_NUM_SPEEDBINS] = { |
| 89 | &timings_jedec_532_mhz |
| 90 | }; |
| 91 | |
| 92 | static const struct lpddr2_device_timings jedec_default_timings = { |
| 93 | .ac_timings = jedec_ac_timings, |
| 94 | .min_tck = &min_tck_jedec |
| 95 | }; |
| 96 | |
| 97 | void emif_get_device_timings(u32 emif_nr, |
| 98 | const struct lpddr2_device_timings **cs0_device_timings, |
| 99 | const struct lpddr2_device_timings **cs1_device_timings) |
| 100 | { |
| 101 | /* Assume Identical devices on EMIF1 & EMIF2 */ |
| 102 | *cs0_device_timings = &jedec_default_timings; |
| 103 | *cs1_device_timings = NULL; |
| 104 | } |
| 105 | #endif /* CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS */ |