332 строки
10 KiB
ArmAsm
332 строки
10 KiB
ArmAsm
/*
|
|
* linux/arch/arm/mach-omap2/sram243x.S
|
|
*
|
|
* Omap2 specific functions that need to be run in internal SRAM
|
|
*
|
|
* (C) Copyright 2004
|
|
* Texas Instruments, <www.ti.com>
|
|
* Richard Woodruff <r-woodruff2@ti.com>
|
|
*
|
|
* 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
|
|
*
|
|
* 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.
|
|
*/
|
|
#include <linux/linkage.h>
|
|
|
|
#include <asm/assembler.h>
|
|
|
|
#include "soc.h"
|
|
#include "iomap.h"
|
|
#include "prm2xxx.h"
|
|
#include "cm2xxx.h"
|
|
#include "sdrc.h"
|
|
|
|
.text
|
|
|
|
.align 3
|
|
ENTRY(omap243x_sram_ddr_init)
|
|
stmfd sp!, {r0 - r12, lr} @ save registers on stack
|
|
|
|
mov r12, r2 @ capture CS1 vs CS0
|
|
mov r8, r3 @ capture force parameter
|
|
|
|
/* frequency shift down */
|
|
ldr r2, omap243x_sdi_cm_clksel2_pll @ get address of dpllout reg
|
|
mov r3, #0x1 @ value for 1x operation
|
|
str r3, [r2] @ go to L1-freq operation
|
|
|
|
/* voltage shift down */
|
|
mov r9, #0x1 @ set up for L1 voltage call
|
|
bl voltage_shift @ go drop voltage
|
|
|
|
/* dll lock mode */
|
|
ldr r11, omap243x_sdi_sdrc_dlla_ctrl @ addr of dlla ctrl
|
|
ldr r10, [r11] @ get current val
|
|
cmp r12, #0x1 @ cs1 base (2422 es2.05/1)
|
|
addeq r11, r11, #0x8 @ if cs1 base, move to DLLB
|
|
mvn r9, #0x4 @ mask to get clear bit2
|
|
and r10, r10, r9 @ clear bit2 for lock mode.
|
|
orr r10, r10, #0x8 @ make sure DLL on (es2 bit pos)
|
|
orr r10, r10, #0x2 @ 90 degree phase for all below 133MHz
|
|
str r10, [r11] @ commit to DLLA_CTRL
|
|
bl i_dll_wait @ wait for dll to lock
|
|
|
|
/* get dll value */
|
|
add r11, r11, #0x4 @ get addr of status reg
|
|
ldr r10, [r11] @ get locked value
|
|
|
|
/* voltage shift up */
|
|
mov r9, #0x0 @ shift back to L0-voltage
|
|
bl voltage_shift @ go raise voltage
|
|
|
|
/* frequency shift up */
|
|
mov r3, #0x2 @ value for 2x operation
|
|
str r3, [r2] @ go to L0-freq operation
|
|
|
|
/* reset entry mode for dllctrl */
|
|
sub r11, r11, #0x4 @ move from status to ctrl
|
|
cmp r12, #0x1 @ normalize if cs1 based
|
|
subeq r11, r11, #0x8 @ possibly back to DLLA
|
|
cmp r8, #0x1 @ if forced unlock exit
|
|
orreq r1, r1, #0x4 @ make sure exit with unlocked value
|
|
str r1, [r11] @ restore DLLA_CTRL high value
|
|
add r11, r11, #0x8 @ move to DLLB_CTRL addr
|
|
str r1, [r11] @ set value DLLB_CTRL
|
|
bl i_dll_wait @ wait for possible lock
|
|
|
|
/* set up for return, DDR should be good */
|
|
str r10, [r0] @ write dll_status and return counter
|
|
ldmfd sp!, {r0 - r12, pc} @ restore regs and return
|
|
|
|
/* ensure the DLL has relocked */
|
|
i_dll_wait:
|
|
mov r4, #0x800 @ delay DLL relock, min 0x400 L3 clocks
|
|
i_dll_delay:
|
|
subs r4, r4, #0x1
|
|
bne i_dll_delay
|
|
ret lr
|
|
|
|
/*
|
|
* shift up or down voltage, use R9 as input to tell level.
|
|
* wait for it to finish, use 32k sync counter, 1tick=31uS.
|
|
*/
|
|
voltage_shift:
|
|
ldr r4, omap243x_sdi_prcm_voltctrl @ get addr of volt ctrl.
|
|
ldr r5, [r4] @ get value.
|
|
ldr r6, prcm_mask_val @ get value of mask
|
|
and r5, r5, r6 @ apply mask to clear bits
|
|
orr r5, r5, r9 @ bulld value for L0/L1-volt operation.
|
|
str r5, [r4] @ set up for change.
|
|
mov r3, #0x4000 @ get val for force
|
|
orr r5, r5, r3 @ build value for force
|
|
str r5, [r4] @ Force transition to L1
|
|
|
|
ldr r3, omap243x_sdi_timer_32ksynct_cr @ get addr of counter
|
|
ldr r5, [r3] @ get value
|
|
add r5, r5, #0x3 @ give it at most 93uS
|
|
volt_delay:
|
|
ldr r7, [r3] @ get timer value
|
|
cmp r5, r7 @ time up?
|
|
bhi volt_delay @ not yet->branch
|
|
ret lr @ back to caller.
|
|
|
|
omap243x_sdi_cm_clksel2_pll:
|
|
.word OMAP2430_CM_REGADDR(PLL_MOD, CM_CLKSEL2)
|
|
omap243x_sdi_sdrc_dlla_ctrl:
|
|
.word OMAP243X_SDRC_REGADDR(SDRC_DLLA_CTRL)
|
|
omap243x_sdi_prcm_voltctrl:
|
|
.word OMAP2430_PRCM_VOLTCTRL
|
|
prcm_mask_val:
|
|
.word 0xFFFF3FFC
|
|
omap243x_sdi_timer_32ksynct_cr:
|
|
.word OMAP2_L4_IO_ADDRESS(OMAP2430_32KSYNCT_BASE + 0x010)
|
|
ENTRY(omap243x_sram_ddr_init_sz)
|
|
.word . - omap243x_sram_ddr_init
|
|
|
|
/*
|
|
* Reprograms memory timings.
|
|
* r0 = [PRCM_FULL | PRCM_HALF] r1 = SDRC_DLLA_CTRL value r2 = [DDR | SDR]
|
|
* PRCM_FULL = 2, PRCM_HALF = 1, DDR = 1, SDR = 0
|
|
*/
|
|
.align 3
|
|
ENTRY(omap243x_sram_reprogram_sdrc)
|
|
stmfd sp!, {r0 - r10, lr} @ save registers on stack
|
|
mov r3, #0x0 @ clear for mrc call
|
|
mcr p15, 0, r3, c7, c10, 4 @ memory barrier, finish ARM SDR/DDR
|
|
nop
|
|
nop
|
|
ldr r6, omap243x_srs_sdrc_rfr_ctrl @ get addr of refresh reg
|
|
ldr r5, [r6] @ get value
|
|
mov r5, r5, lsr #8 @ isolate rfr field and drop burst
|
|
|
|
cmp r0, #0x1 @ going to half speed?
|
|
movne r9, #0x0 @ if up set flag up for pre up, hi volt
|
|
|
|
blne voltage_shift_c @ adjust voltage
|
|
|
|
cmp r0, #0x1 @ going to half speed (post branch link)
|
|
moveq r5, r5, lsr #1 @ divide by 2 if to half
|
|
movne r5, r5, lsl #1 @ mult by 2 if to full
|
|
mov r5, r5, lsl #8 @ put rfr field back into place
|
|
add r5, r5, #0x1 @ turn on burst of 1
|
|
ldr r4, omap243x_srs_cm_clksel2_pll @ get address of out reg
|
|
ldr r3, [r4] @ get curr value
|
|
orr r3, r3, #0x3
|
|
bic r3, r3, #0x3 @ clear lower bits
|
|
orr r3, r3, r0 @ new state value
|
|
str r3, [r4] @ set new state (pll/x, x=1 or 2)
|
|
nop
|
|
nop
|
|
|
|
moveq r9, #0x1 @ if speed down, post down, drop volt
|
|
bleq voltage_shift_c
|
|
|
|
mcr p15, 0, r3, c7, c10, 4 @ memory barrier
|
|
str r5, [r6] @ set new RFR_1 value
|
|
add r6, r6, #0x30 @ get RFR_2 addr
|
|
str r5, [r6] @ set RFR_2
|
|
nop
|
|
cmp r2, #0x1 @ (SDR or DDR) do we need to adjust DLL
|
|
bne freq_out @ leave if SDR, no DLL function
|
|
|
|
/* With DDR, we need to take care of the DLL for the frequency change */
|
|
ldr r2, omap243x_srs_sdrc_dlla_ctrl @ addr of dlla ctrl
|
|
str r1, [r2] @ write out new SDRC_DLLA_CTRL
|
|
add r2, r2, #0x8 @ addr to SDRC_DLLB_CTRL
|
|
str r1, [r2] @ commit to SDRC_DLLB_CTRL
|
|
mov r1, #0x2000 @ wait DLL relock, min 0x400 L3 clocks
|
|
dll_wait:
|
|
subs r1, r1, #0x1
|
|
bne dll_wait
|
|
freq_out:
|
|
ldmfd sp!, {r0 - r10, pc} @ restore regs and return
|
|
|
|
/*
|
|
* shift up or down voltage, use R9 as input to tell level.
|
|
* wait for it to finish, use 32k sync counter, 1tick=31uS.
|
|
*/
|
|
voltage_shift_c:
|
|
ldr r10, omap243x_srs_prcm_voltctrl @ get addr of volt ctrl
|
|
ldr r8, [r10] @ get value
|
|
ldr r7, ddr_prcm_mask_val @ get value of mask
|
|
and r8, r8, r7 @ apply mask to clear bits
|
|
orr r8, r8, r9 @ bulld value for L0/L1-volt operation.
|
|
str r8, [r10] @ set up for change.
|
|
mov r7, #0x4000 @ get val for force
|
|
orr r8, r8, r7 @ build value for force
|
|
str r8, [r10] @ Force transition to L1
|
|
|
|
ldr r10, omap243x_srs_timer_32ksynct @ get addr of counter
|
|
ldr r8, [r10] @ get value
|
|
add r8, r8, #0x2 @ give it at most 62uS (min 31+)
|
|
volt_delay_c:
|
|
ldr r7, [r10] @ get timer value
|
|
cmp r8, r7 @ time up?
|
|
bhi volt_delay_c @ not yet->branch
|
|
ret lr @ back to caller
|
|
|
|
omap243x_srs_cm_clksel2_pll:
|
|
.word OMAP2430_CM_REGADDR(PLL_MOD, CM_CLKSEL2)
|
|
omap243x_srs_sdrc_dlla_ctrl:
|
|
.word OMAP243X_SDRC_REGADDR(SDRC_DLLA_CTRL)
|
|
omap243x_srs_sdrc_rfr_ctrl:
|
|
.word OMAP243X_SDRC_REGADDR(SDRC_RFR_CTRL_0)
|
|
omap243x_srs_prcm_voltctrl:
|
|
.word OMAP2430_PRCM_VOLTCTRL
|
|
ddr_prcm_mask_val:
|
|
.word 0xFFFF3FFC
|
|
omap243x_srs_timer_32ksynct:
|
|
.word OMAP2_L4_IO_ADDRESS(OMAP2430_32KSYNCT_BASE + 0x010)
|
|
|
|
ENTRY(omap243x_sram_reprogram_sdrc_sz)
|
|
.word . - omap243x_sram_reprogram_sdrc
|
|
|
|
/*
|
|
* Set dividers and pll. Also recalculate DLL value for DDR and unlock mode.
|
|
*/
|
|
.align 3
|
|
ENTRY(omap243x_sram_set_prcm)
|
|
stmfd sp!, {r0-r12, lr} @ regs to stack
|
|
adr r4, pbegin @ addr of preload start
|
|
adr r8, pend @ addr of preload end
|
|
mcrr p15, 1, r8, r4, c12 @ preload into icache
|
|
pbegin:
|
|
/* move into fast relock bypass */
|
|
ldr r8, omap243x_ssp_pll_ctl @ get addr
|
|
ldr r5, [r8] @ get val
|
|
mvn r6, #0x3 @ clear mask
|
|
and r5, r5, r6 @ clear field
|
|
orr r7, r5, #0x2 @ fast relock val
|
|
str r7, [r8] @ go to fast relock
|
|
ldr r4, omap243x_ssp_pll_stat @ addr of stat
|
|
block:
|
|
/* wait for bypass */
|
|
ldr r8, [r4] @ stat value
|
|
and r8, r8, #0x3 @ mask for stat
|
|
cmp r8, #0x1 @ there yet
|
|
bne block @ loop if not
|
|
|
|
/* set new dpll dividers _after_ in bypass */
|
|
ldr r4, omap243x_ssp_pll_div @ get addr
|
|
str r0, [r4] @ set dpll ctrl val
|
|
|
|
ldr r4, omap243x_ssp_set_config @ get addr
|
|
mov r8, #1 @ valid cfg msk
|
|
str r8, [r4] @ make dividers take
|
|
|
|
mov r4, #100 @ dead spin a bit
|
|
wait_a_bit:
|
|
subs r4, r4, #1 @ dec loop
|
|
bne wait_a_bit @ delay done?
|
|
|
|
/* check if staying in bypass */
|
|
cmp r2, #0x1 @ stay in bypass?
|
|
beq pend @ jump over dpll relock
|
|
|
|
/* relock DPLL with new vals */
|
|
ldr r5, omap243x_ssp_pll_stat @ get addr
|
|
ldr r4, omap243x_ssp_pll_ctl @ get addr
|
|
orr r8, r7, #0x3 @ val for lock dpll
|
|
str r8, [r4] @ set val
|
|
mov r0, #1000 @ dead spin a bit
|
|
wait_more:
|
|
subs r0, r0, #1 @ dec loop
|
|
bne wait_more @ delay done?
|
|
wait_lock:
|
|
ldr r8, [r5] @ get lock val
|
|
and r8, r8, #3 @ isolate field
|
|
cmp r8, #2 @ locked?
|
|
bne wait_lock @ wait if not
|
|
pend:
|
|
/* update memory timings & briefly lock dll */
|
|
ldr r4, omap243x_ssp_sdrc_rfr @ get addr
|
|
str r1, [r4] @ update refresh timing
|
|
ldr r11, omap243x_ssp_dlla_ctrl @ get addr of DLLA ctrl
|
|
ldr r10, [r11] @ get current val
|
|
mvn r9, #0x4 @ mask to get clear bit2
|
|
and r10, r10, r9 @ clear bit2 for lock mode
|
|
orr r10, r10, #0x8 @ make sure DLL on (es2 bit pos)
|
|
str r10, [r11] @ commit to DLLA_CTRL
|
|
add r11, r11, #0x8 @ move to dllb
|
|
str r10, [r11] @ hit DLLB also
|
|
|
|
mov r4, #0x800 @ relock time (min 0x400 L3 clocks)
|
|
wait_dll_lock:
|
|
subs r4, r4, #0x1
|
|
bne wait_dll_lock
|
|
nop
|
|
ldmfd sp!, {r0-r12, pc} @ restore regs and return
|
|
|
|
omap243x_ssp_set_config:
|
|
.word OMAP2430_PRCM_CLKCFG_CTRL
|
|
omap243x_ssp_pll_ctl:
|
|
.word OMAP2430_CM_REGADDR(PLL_MOD, CM_CLKEN)
|
|
omap243x_ssp_pll_stat:
|
|
.word OMAP2430_CM_REGADDR(PLL_MOD, CM_IDLEST)
|
|
omap243x_ssp_pll_div:
|
|
.word OMAP2430_CM_REGADDR(PLL_MOD, CM_CLKSEL1)
|
|
omap243x_ssp_sdrc_rfr:
|
|
.word OMAP243X_SDRC_REGADDR(SDRC_RFR_CTRL_0)
|
|
omap243x_ssp_dlla_ctrl:
|
|
.word OMAP243X_SDRC_REGADDR(SDRC_DLLA_CTRL)
|
|
|
|
ENTRY(omap243x_sram_set_prcm_sz)
|
|
.word . - omap243x_sram_set_prcm
|