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>

arch/arm/mach-imx/Makefile

@@ -105,7 +105,7 @@ obj-$(CONFIG_SOC_IMX6SL) += clk-imx6sl.o mach-imx6sl.o
 AFLAGS_suspend-imx6.o :=-Wa,-march=armv7-a
 obj-$(CONFIG_SOC_IMX6Q) += pm-imx6q.o headsmp.o suspend-imx6.o
 # i.MX6SL reuses i.MX6Q code
-obj-$(CONFIG_SOC_IMX6SL) += pm-imx6q.o headsmp.o
+obj-$(CONFIG_SOC_IMX6SL) += pm-imx6q.o headsmp.o suspend-imx6.o
 
 # i.MX5 based machines
 obj-$(CONFIG_MACH_MX51_BABBAGE) += mach-mx51_babbage.o

arch/arm/mach-imx/pm-imx6q.c

@@ -121,6 +121,14 @@ static const u32 imx6dl_mmdc_io_offset[] __initconst = {
 	0x74c,			    /* GPR_ADDS */
 };
 
+static const u32 imx6sl_mmdc_io_offset[] __initconst = {
+	0x30c, 0x310, 0x314, 0x318, /* DQM0 ~ DQM3 */
+	0x5c4, 0x5cc, 0x5d4, 0x5d8, /* GPR_B0DS ~ GPR_B3DS */
+	0x300, 0x31c, 0x338, 0x5ac, /* CAS, RAS, SDCLK_0, GPR_ADDS */
+	0x33c, 0x340, 0x5b0, 0x5c0, /* SODT0, SODT1, MODE_CTL, MODE */
+	0x330, 0x334, 0x320,        /* SDCKE0, SDCKE1, RESET */
+};
+
 static const struct imx6_pm_socdata imx6q_pm_data __initconst = {
 	.cpu_type = MXC_CPU_IMX6Q,
 	.mmdc_compat = "fsl,imx6q-mmdc",
@@ -141,6 +149,16 @@ static const struct imx6_pm_socdata imx6dl_pm_data __initconst = {
 	.mmdc_io_offset = imx6dl_mmdc_io_offset,
 };
 
+static const struct imx6_pm_socdata imx6sl_pm_data __initconst = {
+	.cpu_type = MXC_CPU_IMX6SL,
+	.mmdc_compat = "fsl,imx6sl-mmdc",
+	.src_compat = "fsl,imx6sl-src",
+	.iomuxc_compat = "fsl,imx6sl-iomuxc",
+	.gpc_compat = "fsl,imx6sl-gpc",
+	.mmdc_io_num = ARRAY_SIZE(imx6sl_mmdc_io_offset),
+	.mmdc_io_offset = imx6sl_mmdc_io_offset,
+};
+
 /*
  * This structure is for passing necessary data for low level ocram
  * suspend code(arch/arm/mach-imx/suspend-imx6.S), if this struct
@@ -530,5 +548,5 @@ void __init imx6dl_pm_init(void)
 
 void __init imx6sl_pm_init(void)
 {
-	imx6_pm_common_init(NULL);
+	imx6_pm_common_init(&imx6sl_pm_data);
 }

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