diff options
| author | Anson Huang <b20788@freescale.com> | 2014-01-17 11:39:07 +0800 |
|---|---|---|
| committer | Shawn Guo <shawn.guo@linaro.org> | 2014-03-05 10:35:13 +0800 |
| commit | 64b08681398a74a7e802080f22ccdbf150c28167 (patch) | |
| tree | 54d34eb11e6bad7bc6418fe91cdbe582aedb998c /arch/arm/mach-imx/suspend-imx6.S | |
| parent | da9e92613526a1527df3a216fcc58f69948c3570 (diff) | |
ARM: imx: add suspend in ocram support for i.mx6sl
i.MX6SL's suspend in ocram function is derived from i.MX6Q,
it can lower the DDR IO power from ~10mA@1.2V to ~1mA@1.2V,
measured on i.MX6SL EVK board, SH5.
Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Diffstat (limited to 'arch/arm/mach-imx/suspend-imx6.S')
| -rw-r--r-- | arch/arm/mach-imx/suspend-imx6.S | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/arch/arm/mach-imx/suspend-imx6.S b/arch/arm/mach-imx/suspend-imx6.S index d273ee7ecc36..81b9d1da2f21 100644 --- a/arch/arm/mach-imx/suspend-imx6.S +++ b/arch/arm/mach-imx/suspend-imx6.S @@ -63,6 +63,7 @@ #define MX6Q_SRC_GPR1 0x20 #define MX6Q_SRC_GPR2 0x24 #define MX6Q_MMDC_MAPSR 0x404 +#define MX6Q_MMDC_MPDGCTRL0 0x83c #define MX6Q_GPC_IMR1 0x08 #define MX6Q_GPC_IMR2 0x0c #define MX6Q_GPC_IMR3 0x10 @@ -107,14 +108,36 @@ ldreq r11, [r0, #PM_INFO_MX6Q_MMDC_V_OFFSET] ldrne r11, [r0, #PM_INFO_MX6Q_MMDC_P_OFFSET] + cmp r3, #MXC_CPU_IMX6SL + bne 4f + + /* reset read FIFO, RST_RD_FIFO */ + ldr r7, =MX6Q_MMDC_MPDGCTRL0 + ldr r6, [r11, r7] + orr r6, r6, #(1 << 31) + str r6, [r11, r7] +2: + ldr r6, [r11, r7] + ands r6, r6, #(1 << 31) + bne 2b + + /* reset FIFO a second time */ + ldr r6, [r11, r7] + orr r6, r6, #(1 << 31) + str r6, [r11, r7] +3: + ldr r6, [r11, r7] + ands r6, r6, #(1 << 31) + bne 3b +4: /* let DDR out of self-refresh */ ldr r7, [r11, #MX6Q_MMDC_MAPSR] bic r7, r7, #(1 << 21) str r7, [r11, #MX6Q_MMDC_MAPSR] -2: +5: ldr r7, [r11, #MX6Q_MMDC_MAPSR] ands r7, r7, #(1 << 25) - bne 2b + bne 5b /* enable DDR auto power saving */ ldr r7, [r11, #MX6Q_MMDC_MAPSR] @@ -182,12 +205,27 @@ poll_dvfs_set: ldr r7, [r0, #PM_INFO_MMDC_IO_NUM_OFFSET] ldr r8, =PM_INFO_MMDC_IO_VAL_OFFSET add r8, r8, r0 + /* i.MX6SL's last 3 IOs need special setting */ + cmp r3, #MXC_CPU_IMX6SL + subeq r7, r7, #0x3 set_mmdc_io_lpm: ldr r9, [r8], #0x8 str r6, [r11, r9] subs r7, r7, #0x1 bne set_mmdc_io_lpm + cmp r3, #MXC_CPU_IMX6SL + bne set_mmdc_io_lpm_done + ldr r6, =0x1000 + ldr r9, [r8], #0x8 + str r6, [r11, r9] + ldr r9, [r8], #0x8 + str r6, [r11, r9] + ldr r6, =0x80000 + ldr r9, [r8] + str r6, [r11, r9] +set_mmdc_io_lpm_done: + /* * mask all GPC interrupts before * enabling the RBC counters to @@ -282,6 +320,7 @@ resume: str r7, [r11, #MX6Q_SRC_GPR1] str r7, [r11, #MX6Q_SRC_GPR2] + ldr r3, [r0, #PM_INFO_CPU_TYPE_OFFSET] mov r5, #0x1 resume_mmdc |