linux/arch/arm/mach-omap2/sram34xx.S
Syed Mohammed, Khasim cc26b3b01b ARM: OMAP3: Add minimal omap3430 support
Add minimal omap3430 support based on earlier patches from
Syed Mohammed Khasim. Also merge in omap34xx SRAM support
from Karthik Dasu and use consistent naming for sram init
functions.

Also do following changes that make 34xx support usable:

- Remove unused sram.c functions for 34xx

- Rename IRQ_SIR_IRQ to INTCPS_SIR_IRQ and define it locally
  in entry-macro.S

- Update mach-omap2/io.c to support 2420, 2430, and 34xx

- Also merge in 34xx GPMC changes to add fields wr_access and
  wr_data_mux_bus from Adrian Hunter

- Remove memory initialization call omap2_init_memory() until
  until more generic memory initialization patches are posted.
  It's OK to rely on bootloader initialization until then.

Signed-off-by: Syed Mohammed, Khasim <khasim@ti.com>
Signed-off-by: Karthik Dasu<karthik-dp@ti.com>
Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2008-10-09 17:51:41 +03:00

180 lines
4.3 KiB
ArmAsm

/*
* linux/arch/arm/mach-omap3/sram.S
*
* Omap3 specific functions that need to be run in internal SRAM
*
* (C) Copyright 2007
* Texas Instruments Inc.
* Rajendra Nayak <rnayak@ti.com>
*
* (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
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <mach/hardware.h>
#include <mach/io.h>
#include "sdrc.h"
#include "cm.h"
.text
/*
* Change frequency of core dpll
* r0 = sdrc_rfr_ctrl r1 = sdrc_actim_ctrla r2 = sdrc_actim_ctrlb r3 = M2
*/
ENTRY(omap3_sram_configure_core_dpll)
stmfd sp!, {r1-r12, lr} @ store regs to stack
cmp r3, #0x2
blne configure_sdrc
cmp r3, #0x2
blne lock_dll
cmp r3, #0x1
blne unlock_dll
bl sdram_in_selfrefresh @ put the SDRAM in self refresh
bl configure_core_dpll
bl enable_sdrc
cmp r3, #0x1
blne wait_dll_unlock
cmp r3, #0x2
blne wait_dll_lock
cmp r3, #0x1
blne configure_sdrc
mov r0, #0 @ return value
ldmfd sp!, {r1-r12, pc} @ restore regs and return
unlock_dll:
ldr r4, omap3_sdrc_dlla_ctrl
ldr r5, [r4]
orr r5, r5, #0x4
str r5, [r4]
bx lr
lock_dll:
ldr r4, omap3_sdrc_dlla_ctrl
ldr r5, [r4]
bic r5, r5, #0x4
str r5, [r4]
bx lr
sdram_in_selfrefresh:
mov r5, #0x0 @ Move 0 to R5
mcr p15, 0, r5, c7, c10, 5 @ memory barrier
ldr r4, omap3_sdrc_power @ read the SDRC_POWER register
ldr r5, [r4] @ read the contents of SDRC_POWER
orr r5, r5, #0x40 @ enable self refresh on idle req
str r5, [r4] @ write back to SDRC_POWER register
ldr r4, omap3_cm_iclken1_core @ read the CM_ICLKEN1_CORE reg
ldr r5, [r4]
bic r5, r5, #0x2 @ disable iclk bit for SRDC
str r5, [r4]
wait_sdrc_idle:
ldr r4, omap3_cm_idlest1_core
ldr r5, [r4]
and r5, r5, #0x2 @ check for SDRC idle
cmp r5, #2
bne wait_sdrc_idle
bx lr
configure_core_dpll:
ldr r4, omap3_cm_clksel1_pll
ldr r5, [r4]
ldr r6, core_m2_mask_val @ modify m2 for core dpll
and r5, r5, r6
orr r5, r5, r3, lsl #0x1B @ r3 contains the M2 val
str r5, [r4]
mov r5, #0x800 @ wait for the clock to stabilise
cmp r3, #2
bne wait_clk_stable
bx lr
wait_clk_stable:
subs r5, r5, #1
bne wait_clk_stable
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
bx lr
enable_sdrc:
ldr r4, omap3_cm_iclken1_core
ldr r5, [r4]
orr r5, r5, #0x2 @ enable iclk bit for SDRC
str r5, [r4]
wait_sdrc_idle1:
ldr r4, omap3_cm_idlest1_core
ldr r5, [r4]
and r5, r5, #0x2
cmp r5, #0
bne wait_sdrc_idle1
ldr r4, omap3_sdrc_power
ldr r5, [r4]
bic r5, r5, #0x40
str r5, [r4]
bx lr
wait_dll_lock:
ldr r4, omap3_sdrc_dlla_status
ldr r5, [r4]
and r5, r5, #0x4
cmp r5, #0x4
bne wait_dll_lock
bx lr
wait_dll_unlock:
ldr r4, omap3_sdrc_dlla_status
ldr r5, [r4]
and r5, r5, #0x4
cmp r5, #0x0
bne wait_dll_unlock
bx lr
configure_sdrc:
ldr r4, omap3_sdrc_rfr_ctrl
str r0, [r4]
ldr r4, omap3_sdrc_actim_ctrla
str r1, [r4]
ldr r4, omap3_sdrc_actim_ctrlb
str r2, [r4]
bx lr
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:
.word OMAP34XX_SDRC_REGADDR(SDRC_RFR_CTRL_0)
omap3_sdrc_actim_ctrla:
.word OMAP34XX_SDRC_REGADDR(SDRC_ACTIM_CTRL_A_0)
omap3_sdrc_actim_ctrlb:
.word OMAP34XX_SDRC_REGADDR(SDRC_ACTIM_CTRL_B_0)
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
ENTRY(omap3_sram_configure_core_dpll_sz)
.word . - omap3_sram_configure_core_dpll