| /* |
| * linux/arch/arm/mach-omap3/sram.S |
| * |
| * Omap3 specific functions that need to be run in internal SRAM |
| * |
| * Copyright (C) 2004, 2007, 2008 Texas Instruments, Inc. |
| * Copyright (C) 2008 Nokia Corporation |
| * |
| * Rajendra Nayak <rnayak@ti.com> |
| * Richard Woodruff <r-woodruff2@ti.com> |
| * Paul Walmsley |
| * |
| * 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 <linux/linkage.h> |
| #include <asm/assembler.h> |
| #include <mach/hardware.h> |
| |
| #include <mach/io.h> |
| |
| #include "sdrc.h" |
| #include "cm2xxx_3xxx.h" |
| |
| /* |
| * This file needs be built unconditionally as ARM to interoperate correctly |
| * with non-Thumb-2-capable firmware. |
| */ |
| .arm |
| |
| .text |
| |
| /* r1 parameters */ |
| #define SDRC_NO_UNLOCK_DLL 0x0 |
| #define SDRC_UNLOCK_DLL 0x1 |
| |
| /* SDRC_DLLA_CTRL bit settings */ |
| #define FIXEDDELAY_SHIFT 24 |
| #define FIXEDDELAY_MASK (0xff << FIXEDDELAY_SHIFT) |
| #define DLLIDLE_MASK 0x4 |
| |
| /* |
| * SDRC_DLLA_CTRL default values: TI hardware team indicates that |
| * FIXEDDELAY should be initialized to 0xf. This apparently was |
| * empirically determined during process testing, so no derivation |
| * was provided. |
| */ |
| #define FIXEDDELAY_DEFAULT (0x0f << FIXEDDELAY_SHIFT) |
| |
| /* SDRC_DLLA_STATUS bit settings */ |
| #define LOCKSTATUS_MASK 0x4 |
| |
| /* SDRC_POWER bit settings */ |
| #define SRFRONIDLEREQ_MASK 0x40 |
| |
| /* CM_IDLEST1_CORE bit settings */ |
| #define ST_SDRC_MASK 0x2 |
| |
| /* CM_ICLKEN1_CORE bit settings */ |
| #define EN_SDRC_MASK 0x2 |
| |
| /* CM_CLKSEL1_PLL bit settings */ |
| #define CORE_DPLL_CLKOUT_DIV_SHIFT 0x1b |
| |
| /* |
| * omap3_sram_configure_core_dpll - change DPLL3 M2 divider |
| * |
| * Params passed in registers: |
| * r0 = new M2 divider setting (only 1 and 2 supported right now) |
| * r1 = unlock SDRC DLL? (1 = yes, 0 = no). Only unlock DLL for |
| * SDRC rates < 83MHz |
| * r2 = number of MPU cycles to wait for SDRC to stabilize after |
| * reprogramming the SDRC when switching to a slower MPU speed |
| * r3 = increasing SDRC rate? (1 = yes, 0 = no) |
| * |
| * Params passed via the stack. The needed params will be copied in SRAM |
| * before use by the code in SRAM (SDRAM is not accessible during SDRC |
| * reconfiguration): |
| * new SDRC_RFR_CTRL_0 register contents |
| * new SDRC_ACTIM_CTRL_A_0 register contents |
| * new SDRC_ACTIM_CTRL_B_0 register contents |
| * new SDRC_MR_0 register value |
| * new SDRC_RFR_CTRL_1 register contents |
| * new SDRC_ACTIM_CTRL_A_1 register contents |
| * new SDRC_ACTIM_CTRL_B_1 register contents |
| * new SDRC_MR_1 register value |
| * |
| * If the param SDRC_RFR_CTRL_1 is 0, the parameters are not programmed into |
| * the SDRC CS1 registers |
| * |
| * NOTE: This code no longer attempts to program the SDRC AC timing and MR |
| * registers. This is because the code currently cannot ensure that all |
| * L3 initiators (e.g., sDMA, IVA, DSS DISPC, etc.) are not accessing the |
| * SDRAM when the registers are written. If the registers are changed while |
| * an initiator is accessing SDRAM, memory can be corrupted and/or the SDRC |
| * may enter an unpredictable state. In the future, the intent is to |
| * re-enable this code in cases where we can ensure that no initiators are |
| * touching the SDRAM. Until that time, users who know that their use case |
| * can satisfy the above requirement can enable the CONFIG_OMAP3_SDRC_AC_TIMING |
| * option. |
| * |
| * Richard Woodruff notes that any changes to this code must be carefully |
| * audited and tested to ensure that they don't cause a TLB miss while |
| * the SDRAM is inaccessible. Such a situation will crash the system |
| * since it will cause the ARM MMU to attempt to walk the page tables. |
| * These crashes may be intermittent. |
| */ |
| .align 3 |
| ENTRY(omap3_sram_configure_core_dpll) |
| stmfd sp!, {r1-r12, lr} @ store regs to stack |
| |
| @ pull the extra args off the stack |
| @ and store them in SRAM |
| |
| /* |
| * PC-relative stores are deprecated in ARMv7 and lead to undefined behaviour |
| * in Thumb-2: use a r7 as a base instead. |
| * Be careful not to clobber r7 when maintaing this file. |
| */ |
| THUMB( adr r7, omap3_sram_configure_core_dpll ) |
| .macro strtext Rt:req, label:req |
| ARM( str \Rt, \label ) |
| THUMB( str \Rt, [r7, \label - omap3_sram_configure_core_dpll] ) |
| .endm |
| |
| ldr r4, [sp, #52] |
| strtext r4, omap_sdrc_rfr_ctrl_0_val |
| ldr r4, [sp, #56] |
| strtext r4, omap_sdrc_actim_ctrl_a_0_val |
| ldr r4, [sp, #60] |
| strtext r4, omap_sdrc_actim_ctrl_b_0_val |
| ldr r4, [sp, #64] |
| strtext r4, omap_sdrc_mr_0_val |
| ldr r4, [sp, #68] |
| strtext r4, omap_sdrc_rfr_ctrl_1_val |
| cmp r4, #0 @ if SDRC_RFR_CTRL_1 is 0, |
| beq skip_cs1_params @ do not use cs1 params |
| ldr r4, [sp, #72] |
| strtext r4, omap_sdrc_actim_ctrl_a_1_val |
| ldr r4, [sp, #76] |
| strtext r4, omap_sdrc_actim_ctrl_b_1_val |
| ldr r4, [sp, #80] |
| strtext r4, omap_sdrc_mr_1_val |
| skip_cs1_params: |
| mrc p15, 0, r8, c1, c0, 0 @ read ctrl register |
| bic r10, r8, #0x800 @ clear Z-bit, disable branch prediction |
| mcr p15, 0, r10, c1, c0, 0 @ write ctrl register |
| dsb @ flush buffered writes to interconnect |
| isb @ prevent speculative exec past here |
| cmp r3, #1 @ if increasing SDRC clk rate, |
| bleq configure_sdrc @ program the SDRC regs early (for RFR) |
| cmp r1, #SDRC_UNLOCK_DLL @ set the intended DLL state |
| bleq unlock_dll |
| blne lock_dll |
| bl sdram_in_selfrefresh @ put SDRAM in self refresh, idle SDRC |
| bl configure_core_dpll @ change the DPLL3 M2 divider |
| mov r12, r2 |
| bl wait_clk_stable @ wait for SDRC to stabilize |
| bl enable_sdrc @ take SDRC out of idle |
| cmp r1, #SDRC_UNLOCK_DLL @ wait for DLL status to change |
| bleq wait_dll_unlock |
| blne wait_dll_lock |
| cmp r3, #1 @ if increasing SDRC clk rate, |
| beq return_to_sdram @ return to SDRAM code, otherwise, |
| bl configure_sdrc @ reprogram SDRC regs now |
| return_to_sdram: |
| mcr p15, 0, r8, c1, c0, 0 @ restore ctrl register |
| isb @ prevent speculative exec past here |
| mov r0, #0 @ return value |
| ldmfd sp!, {r1-r12, pc} @ restore regs and return |
| unlock_dll: |
| ldr r11, omap3_sdrc_dlla_ctrl |
| ldr r12, [r11] |
| bic r12, r12, #FIXEDDELAY_MASK |
| orr r12, r12, #FIXEDDELAY_DEFAULT |
| orr r12, r12, #DLLIDLE_MASK |
| str r12, [r11] @ (no OCP barrier needed) |
| bx lr |
| lock_dll: |
| ldr r11, omap3_sdrc_dlla_ctrl |
| ldr r12, [r11] |
| bic r12, r12, #DLLIDLE_MASK |
| str r12, [r11] @ (no OCP barrier needed) |
| bx lr |
| sdram_in_selfrefresh: |
| ldr r11, omap3_sdrc_power @ read the SDRC_POWER register |
| ldr r12, [r11] @ read the contents of SDRC_POWER |
| mov r9, r12 @ keep a copy of SDRC_POWER bits |
| orr r12, r12, #SRFRONIDLEREQ_MASK @ enable self refresh on idle |
| str r12, [r11] @ write back to SDRC_POWER register |
| ldr r12, [r11] @ posted-write barrier for SDRC |
| idle_sdrc: |
| ldr r11, omap3_cm_iclken1_core @ read the CM_ICLKEN1_CORE reg |
| ldr r12, [r11] |
| bic r12, r12, #EN_SDRC_MASK @ disable iclk bit for SDRC |
| str r12, [r11] |
| wait_sdrc_idle: |
| ldr r11, omap3_cm_idlest1_core |
| ldr r12, [r11] |
| and r12, r12, #ST_SDRC_MASK @ check for SDRC idle |
| cmp r12, #ST_SDRC_MASK |
| bne wait_sdrc_idle |
| bx lr |
| configure_core_dpll: |
| ldr r11, omap3_cm_clksel1_pll |
| ldr r12, [r11] |
| ldr r10, core_m2_mask_val @ modify m2 for core dpll |
| and r12, r12, r10 |
| orr r12, r12, r0, lsl #CORE_DPLL_CLKOUT_DIV_SHIFT |
| str r12, [r11] |
| ldr r12, [r11] @ posted-write barrier for CM |
| bx lr |
| wait_clk_stable: |
| subs r12, r12, #1 |
| bne wait_clk_stable |
| bx lr |
| enable_sdrc: |
| ldr r11, omap3_cm_iclken1_core |
| ldr r12, [r11] |
| orr r12, r12, #EN_SDRC_MASK @ enable iclk bit for SDRC |
| str r12, [r11] |
| wait_sdrc_idle1: |
| ldr r11, omap3_cm_idlest1_core |
| ldr r12, [r11] |
| and r12, r12, #ST_SDRC_MASK |
| cmp r12, #0 |
| bne wait_sdrc_idle1 |
| restore_sdrc_power_val: |
| ldr r11, omap3_sdrc_power |
| str r9, [r11] @ restore SDRC_POWER, no barrier needed |
| bx lr |
| wait_dll_lock: |
| ldr r11, omap3_sdrc_dlla_status |
| ldr r12, [r11] |
| and r12, r12, #LOCKSTATUS_MASK |
| cmp r12, #LOCKSTATUS_MASK |
| bne wait_dll_lock |
| bx lr |
| wait_dll_unlock: |
| ldr r11, omap3_sdrc_dlla_status |
| ldr r12, [r11] |
| and r12, r12, #LOCKSTATUS_MASK |
| cmp r12, #0x0 |
| bne wait_dll_unlock |
| bx lr |
| configure_sdrc: |
| ldr r12, omap_sdrc_rfr_ctrl_0_val @ fetch value from SRAM |
| ldr r11, omap3_sdrc_rfr_ctrl_0 @ fetch addr from SRAM |
| str r12, [r11] @ store |
| #ifdef CONFIG_OMAP3_SDRC_AC_TIMING |
| ldr r12, omap_sdrc_actim_ctrl_a_0_val |
| ldr r11, omap3_sdrc_actim_ctrl_a_0 |
| str r12, [r11] |
| ldr r12, omap_sdrc_actim_ctrl_b_0_val |
| ldr r11, omap3_sdrc_actim_ctrl_b_0 |
| str r12, [r11] |
| ldr r12, omap_sdrc_mr_0_val |
| ldr r11, omap3_sdrc_mr_0 |
| str r12, [r11] |
| #endif |
| ldr r12, omap_sdrc_rfr_ctrl_1_val |
| cmp r12, #0 @ if SDRC_RFR_CTRL_1 is 0, |
| beq skip_cs1_prog @ do not program cs1 params |
| ldr r11, omap3_sdrc_rfr_ctrl_1 |
| str r12, [r11] |
| #ifdef CONFIG_OMAP3_SDRC_AC_TIMING |
| ldr r12, omap_sdrc_actim_ctrl_a_1_val |
| ldr r11, omap3_sdrc_actim_ctrl_a_1 |
| str r12, [r11] |
| ldr r12, omap_sdrc_actim_ctrl_b_1_val |
| ldr r11, omap3_sdrc_actim_ctrl_b_1 |
| str r12, [r11] |
| ldr r12, omap_sdrc_mr_1_val |
| ldr r11, omap3_sdrc_mr_1 |
| str r12, [r11] |
| #endif |
| skip_cs1_prog: |
| ldr r12, [r11] @ posted-write barrier for SDRC |
| bx lr |
| |
| .align |
| omap3_sdrc_power: |
| .word OMAP34XX_SDRC_REGADDR(SDRC_POWER) |
| omap3_cm_clksel1_pll: |
| .word OMAP34XX_CM_REGADDR(PLL_MOD, CM_CLKSEL1) |
| omap3_cm_idlest1_core: |
| .word OMAP34XX_CM_REGADDR(CORE_MOD, CM_IDLEST) |
| omap3_cm_iclken1_core: |
| .word OMAP34XX_CM_REGADDR(CORE_MOD, CM_ICLKEN1) |
| |
| omap3_sdrc_rfr_ctrl_0: |
| .word OMAP34XX_SDRC_REGADDR(SDRC_RFR_CTRL_0) |
| omap3_sdrc_rfr_ctrl_1: |
| .word OMAP34XX_SDRC_REGADDR(SDRC_RFR_CTRL_1) |
| omap3_sdrc_actim_ctrl_a_0: |
| .word OMAP34XX_SDRC_REGADDR(SDRC_ACTIM_CTRL_A_0) |
| omap3_sdrc_actim_ctrl_a_1: |
| .word OMAP34XX_SDRC_REGADDR(SDRC_ACTIM_CTRL_A_1) |
| omap3_sdrc_actim_ctrl_b_0: |
| .word OMAP34XX_SDRC_REGADDR(SDRC_ACTIM_CTRL_B_0) |
| omap3_sdrc_actim_ctrl_b_1: |
| .word OMAP34XX_SDRC_REGADDR(SDRC_ACTIM_CTRL_B_1) |
| omap3_sdrc_mr_0: |
| .word OMAP34XX_SDRC_REGADDR(SDRC_MR_0) |
| omap3_sdrc_mr_1: |
| .word OMAP34XX_SDRC_REGADDR(SDRC_MR_1) |
| omap_sdrc_rfr_ctrl_0_val: |
| .word 0xDEADBEEF |
| omap_sdrc_rfr_ctrl_1_val: |
| .word 0xDEADBEEF |
| omap_sdrc_actim_ctrl_a_0_val: |
| .word 0xDEADBEEF |
| omap_sdrc_actim_ctrl_a_1_val: |
| .word 0xDEADBEEF |
| omap_sdrc_actim_ctrl_b_0_val: |
| .word 0xDEADBEEF |
| omap_sdrc_actim_ctrl_b_1_val: |
| .word 0xDEADBEEF |
| omap_sdrc_mr_0_val: |
| .word 0xDEADBEEF |
| omap_sdrc_mr_1_val: |
| .word 0xDEADBEEF |
| |
| omap3_sdrc_dlla_status: |
| .word OMAP34XX_SDRC_REGADDR(SDRC_DLLA_STATUS) |
| omap3_sdrc_dlla_ctrl: |
| .word OMAP34XX_SDRC_REGADDR(SDRC_DLLA_CTRL) |
| core_m2_mask_val: |
| .word 0x07FFFFFF |
| ENDPROC(omap3_sram_configure_core_dpll) |
| |
| ENTRY(omap3_sram_configure_core_dpll_sz) |
| .word . - omap3_sram_configure_core_dpll |
| |