347 lines
11 KiB
ArmAsm
347 lines
11 KiB
ArmAsm
/*
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* linux/arch/arm/mach-omap3/sram.S
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*
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* Omap3 specific functions that need to be run in internal SRAM
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*
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* Copyright (C) 2004, 2007, 2008 Texas Instruments, Inc.
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* Copyright (C) 2008 Nokia Corporation
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*
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* Rajendra Nayak <rnayak@ti.com>
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* Richard Woodruff <r-woodruff2@ti.com>
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* Paul Walmsley
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <mach/hardware.h>
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#include <mach/io.h>
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#include "sdrc.h"
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#include "cm2xxx_3xxx.h"
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/*
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* This file needs be built unconditionally as ARM to interoperate correctly
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* with non-Thumb-2-capable firmware.
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*/
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.arm
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.text
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/* r1 parameters */
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#define SDRC_NO_UNLOCK_DLL 0x0
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#define SDRC_UNLOCK_DLL 0x1
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/* SDRC_DLLA_CTRL bit settings */
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#define FIXEDDELAY_SHIFT 24
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#define FIXEDDELAY_MASK (0xff << FIXEDDELAY_SHIFT)
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#define DLLIDLE_MASK 0x4
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/*
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* SDRC_DLLA_CTRL default values: TI hardware team indicates that
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* FIXEDDELAY should be initialized to 0xf. This apparently was
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* empirically determined during process testing, so no derivation
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* was provided.
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*/
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#define FIXEDDELAY_DEFAULT (0x0f << FIXEDDELAY_SHIFT)
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/* SDRC_DLLA_STATUS bit settings */
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#define LOCKSTATUS_MASK 0x4
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/* SDRC_POWER bit settings */
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#define SRFRONIDLEREQ_MASK 0x40
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/* CM_IDLEST1_CORE bit settings */
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#define ST_SDRC_MASK 0x2
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/* CM_ICLKEN1_CORE bit settings */
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#define EN_SDRC_MASK 0x2
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/* CM_CLKSEL1_PLL bit settings */
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#define CORE_DPLL_CLKOUT_DIV_SHIFT 0x1b
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/*
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* omap3_sram_configure_core_dpll - change DPLL3 M2 divider
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*
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* Params passed in registers:
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* r0 = new M2 divider setting (only 1 and 2 supported right now)
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* r1 = unlock SDRC DLL? (1 = yes, 0 = no). Only unlock DLL for
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* SDRC rates < 83MHz
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* r2 = number of MPU cycles to wait for SDRC to stabilize after
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* reprogramming the SDRC when switching to a slower MPU speed
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* r3 = increasing SDRC rate? (1 = yes, 0 = no)
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*
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* Params passed via the stack. The needed params will be copied in SRAM
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* before use by the code in SRAM (SDRAM is not accessible during SDRC
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* reconfiguration):
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* new SDRC_RFR_CTRL_0 register contents
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* new SDRC_ACTIM_CTRL_A_0 register contents
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* new SDRC_ACTIM_CTRL_B_0 register contents
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* new SDRC_MR_0 register value
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* new SDRC_RFR_CTRL_1 register contents
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* new SDRC_ACTIM_CTRL_A_1 register contents
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* new SDRC_ACTIM_CTRL_B_1 register contents
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* new SDRC_MR_1 register value
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*
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* If the param SDRC_RFR_CTRL_1 is 0, the parameters are not programmed into
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* the SDRC CS1 registers
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*
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* NOTE: This code no longer attempts to program the SDRC AC timing and MR
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* registers. This is because the code currently cannot ensure that all
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* L3 initiators (e.g., sDMA, IVA, DSS DISPC, etc.) are not accessing the
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* SDRAM when the registers are written. If the registers are changed while
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* an initiator is accessing SDRAM, memory can be corrupted and/or the SDRC
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* may enter an unpredictable state. In the future, the intent is to
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* re-enable this code in cases where we can ensure that no initiators are
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* touching the SDRAM. Until that time, users who know that their use case
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* can satisfy the above requirement can enable the CONFIG_OMAP3_SDRC_AC_TIMING
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* option.
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*
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* Richard Woodruff notes that any changes to this code must be carefully
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* audited and tested to ensure that they don't cause a TLB miss while
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* the SDRAM is inaccessible. Such a situation will crash the system
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* since it will cause the ARM MMU to attempt to walk the page tables.
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* These crashes may be intermittent.
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*/
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.align 3
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ENTRY(omap3_sram_configure_core_dpll)
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stmfd sp!, {r1-r12, lr} @ store regs to stack
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@ pull the extra args off the stack
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@ and store them in SRAM
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/*
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* PC-relative stores are deprecated in ARMv7 and lead to undefined behaviour
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* in Thumb-2: use a r7 as a base instead.
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* Be careful not to clobber r7 when maintaing this file.
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*/
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THUMB( adr r7, omap3_sram_configure_core_dpll )
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.macro strtext Rt:req, label:req
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ARM( str \Rt, \label )
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THUMB( str \Rt, [r7, \label - omap3_sram_configure_core_dpll] )
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.endm
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ldr r4, [sp, #52]
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strtext r4, omap_sdrc_rfr_ctrl_0_val
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ldr r4, [sp, #56]
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strtext r4, omap_sdrc_actim_ctrl_a_0_val
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ldr r4, [sp, #60]
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strtext r4, omap_sdrc_actim_ctrl_b_0_val
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ldr r4, [sp, #64]
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strtext r4, omap_sdrc_mr_0_val
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ldr r4, [sp, #68]
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strtext r4, omap_sdrc_rfr_ctrl_1_val
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cmp r4, #0 @ if SDRC_RFR_CTRL_1 is 0,
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beq skip_cs1_params @ do not use cs1 params
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ldr r4, [sp, #72]
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strtext r4, omap_sdrc_actim_ctrl_a_1_val
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ldr r4, [sp, #76]
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strtext r4, omap_sdrc_actim_ctrl_b_1_val
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ldr r4, [sp, #80]
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strtext r4, omap_sdrc_mr_1_val
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skip_cs1_params:
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mrc p15, 0, r8, c1, c0, 0 @ read ctrl register
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bic r10, r8, #0x800 @ clear Z-bit, disable branch prediction
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mcr p15, 0, r10, c1, c0, 0 @ write ctrl register
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dsb @ flush buffered writes to interconnect
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isb @ prevent speculative exec past here
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cmp r3, #1 @ if increasing SDRC clk rate,
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bleq configure_sdrc @ program the SDRC regs early (for RFR)
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cmp r1, #SDRC_UNLOCK_DLL @ set the intended DLL state
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bleq unlock_dll
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blne lock_dll
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bl sdram_in_selfrefresh @ put SDRAM in self refresh, idle SDRC
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bl configure_core_dpll @ change the DPLL3 M2 divider
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mov r12, r2
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bl wait_clk_stable @ wait for SDRC to stabilize
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bl enable_sdrc @ take SDRC out of idle
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cmp r1, #SDRC_UNLOCK_DLL @ wait for DLL status to change
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bleq wait_dll_unlock
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blne wait_dll_lock
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cmp r3, #1 @ if increasing SDRC clk rate,
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beq return_to_sdram @ return to SDRAM code, otherwise,
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bl configure_sdrc @ reprogram SDRC regs now
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return_to_sdram:
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mcr p15, 0, r8, c1, c0, 0 @ restore ctrl register
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isb @ prevent speculative exec past here
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mov r0, #0 @ return value
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ldmfd sp!, {r1-r12, pc} @ restore regs and return
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unlock_dll:
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ldr r11, omap3_sdrc_dlla_ctrl
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ldr r12, [r11]
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bic r12, r12, #FIXEDDELAY_MASK
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orr r12, r12, #FIXEDDELAY_DEFAULT
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orr r12, r12, #DLLIDLE_MASK
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str r12, [r11] @ (no OCP barrier needed)
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bx lr
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lock_dll:
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ldr r11, omap3_sdrc_dlla_ctrl
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ldr r12, [r11]
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bic r12, r12, #DLLIDLE_MASK
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str r12, [r11] @ (no OCP barrier needed)
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bx lr
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sdram_in_selfrefresh:
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ldr r11, omap3_sdrc_power @ read the SDRC_POWER register
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ldr r12, [r11] @ read the contents of SDRC_POWER
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mov r9, r12 @ keep a copy of SDRC_POWER bits
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orr r12, r12, #SRFRONIDLEREQ_MASK @ enable self refresh on idle
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str r12, [r11] @ write back to SDRC_POWER register
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ldr r12, [r11] @ posted-write barrier for SDRC
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idle_sdrc:
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ldr r11, omap3_cm_iclken1_core @ read the CM_ICLKEN1_CORE reg
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ldr r12, [r11]
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bic r12, r12, #EN_SDRC_MASK @ disable iclk bit for SDRC
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str r12, [r11]
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wait_sdrc_idle:
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ldr r11, omap3_cm_idlest1_core
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ldr r12, [r11]
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and r12, r12, #ST_SDRC_MASK @ check for SDRC idle
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cmp r12, #ST_SDRC_MASK
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bne wait_sdrc_idle
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bx lr
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configure_core_dpll:
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ldr r11, omap3_cm_clksel1_pll
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ldr r12, [r11]
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ldr r10, core_m2_mask_val @ modify m2 for core dpll
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and r12, r12, r10
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orr r12, r12, r0, lsl #CORE_DPLL_CLKOUT_DIV_SHIFT
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str r12, [r11]
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ldr r12, [r11] @ posted-write barrier for CM
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bx lr
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wait_clk_stable:
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subs r12, r12, #1
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bne wait_clk_stable
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bx lr
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enable_sdrc:
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ldr r11, omap3_cm_iclken1_core
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ldr r12, [r11]
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orr r12, r12, #EN_SDRC_MASK @ enable iclk bit for SDRC
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str r12, [r11]
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wait_sdrc_idle1:
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ldr r11, omap3_cm_idlest1_core
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ldr r12, [r11]
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and r12, r12, #ST_SDRC_MASK
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cmp r12, #0
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bne wait_sdrc_idle1
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restore_sdrc_power_val:
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ldr r11, omap3_sdrc_power
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str r9, [r11] @ restore SDRC_POWER, no barrier needed
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bx lr
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wait_dll_lock:
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ldr r11, omap3_sdrc_dlla_status
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ldr r12, [r11]
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and r12, r12, #LOCKSTATUS_MASK
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cmp r12, #LOCKSTATUS_MASK
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bne wait_dll_lock
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bx lr
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wait_dll_unlock:
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ldr r11, omap3_sdrc_dlla_status
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ldr r12, [r11]
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and r12, r12, #LOCKSTATUS_MASK
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cmp r12, #0x0
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bne wait_dll_unlock
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bx lr
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configure_sdrc:
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ldr r12, omap_sdrc_rfr_ctrl_0_val @ fetch value from SRAM
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ldr r11, omap3_sdrc_rfr_ctrl_0 @ fetch addr from SRAM
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str r12, [r11] @ store
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#ifdef CONFIG_OMAP3_SDRC_AC_TIMING
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ldr r12, omap_sdrc_actim_ctrl_a_0_val
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ldr r11, omap3_sdrc_actim_ctrl_a_0
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str r12, [r11]
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ldr r12, omap_sdrc_actim_ctrl_b_0_val
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ldr r11, omap3_sdrc_actim_ctrl_b_0
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str r12, [r11]
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ldr r12, omap_sdrc_mr_0_val
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ldr r11, omap3_sdrc_mr_0
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str r12, [r11]
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#endif
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ldr r12, omap_sdrc_rfr_ctrl_1_val
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cmp r12, #0 @ if SDRC_RFR_CTRL_1 is 0,
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beq skip_cs1_prog @ do not program cs1 params
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ldr r11, omap3_sdrc_rfr_ctrl_1
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str r12, [r11]
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#ifdef CONFIG_OMAP3_SDRC_AC_TIMING
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ldr r12, omap_sdrc_actim_ctrl_a_1_val
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ldr r11, omap3_sdrc_actim_ctrl_a_1
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str r12, [r11]
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ldr r12, omap_sdrc_actim_ctrl_b_1_val
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ldr r11, omap3_sdrc_actim_ctrl_b_1
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str r12, [r11]
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ldr r12, omap_sdrc_mr_1_val
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ldr r11, omap3_sdrc_mr_1
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str r12, [r11]
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#endif
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skip_cs1_prog:
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ldr r12, [r11] @ posted-write barrier for SDRC
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bx lr
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.align
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omap3_sdrc_power:
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.word OMAP34XX_SDRC_REGADDR(SDRC_POWER)
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omap3_cm_clksel1_pll:
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.word OMAP34XX_CM_REGADDR(PLL_MOD, CM_CLKSEL1)
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omap3_cm_idlest1_core:
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.word OMAP34XX_CM_REGADDR(CORE_MOD, CM_IDLEST)
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omap3_cm_iclken1_core:
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.word OMAP34XX_CM_REGADDR(CORE_MOD, CM_ICLKEN1)
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omap3_sdrc_rfr_ctrl_0:
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.word OMAP34XX_SDRC_REGADDR(SDRC_RFR_CTRL_0)
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omap3_sdrc_rfr_ctrl_1:
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.word OMAP34XX_SDRC_REGADDR(SDRC_RFR_CTRL_1)
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omap3_sdrc_actim_ctrl_a_0:
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.word OMAP34XX_SDRC_REGADDR(SDRC_ACTIM_CTRL_A_0)
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omap3_sdrc_actim_ctrl_a_1:
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.word OMAP34XX_SDRC_REGADDR(SDRC_ACTIM_CTRL_A_1)
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omap3_sdrc_actim_ctrl_b_0:
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.word OMAP34XX_SDRC_REGADDR(SDRC_ACTIM_CTRL_B_0)
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omap3_sdrc_actim_ctrl_b_1:
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.word OMAP34XX_SDRC_REGADDR(SDRC_ACTIM_CTRL_B_1)
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omap3_sdrc_mr_0:
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.word OMAP34XX_SDRC_REGADDR(SDRC_MR_0)
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omap3_sdrc_mr_1:
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.word OMAP34XX_SDRC_REGADDR(SDRC_MR_1)
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omap_sdrc_rfr_ctrl_0_val:
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.word 0xDEADBEEF
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omap_sdrc_rfr_ctrl_1_val:
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.word 0xDEADBEEF
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omap_sdrc_actim_ctrl_a_0_val:
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.word 0xDEADBEEF
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omap_sdrc_actim_ctrl_a_1_val:
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.word 0xDEADBEEF
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omap_sdrc_actim_ctrl_b_0_val:
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.word 0xDEADBEEF
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omap_sdrc_actim_ctrl_b_1_val:
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.word 0xDEADBEEF
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omap_sdrc_mr_0_val:
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.word 0xDEADBEEF
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omap_sdrc_mr_1_val:
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.word 0xDEADBEEF
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omap3_sdrc_dlla_status:
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.word OMAP34XX_SDRC_REGADDR(SDRC_DLLA_STATUS)
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omap3_sdrc_dlla_ctrl:
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.word OMAP34XX_SDRC_REGADDR(SDRC_DLLA_CTRL)
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core_m2_mask_val:
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.word 0x07FFFFFF
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ENDPROC(omap3_sram_configure_core_dpll)
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ENTRY(omap3_sram_configure_core_dpll_sz)
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.word . - omap3_sram_configure_core_dpll
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