mpc85xx/t104x: Add deep sleep framework support

When T104x soc wakes up from deep sleep, control is passed to the
primary core that starts executing uboot. After re-initialized some
IP blocks, like DDRC, kernel will take responsibility to continue
to restore environment it leaves before.

Signed-off-by: Tang Yuantian <Yuantian.Tang@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

1 files changed, 48 insertions, 4 deletions

diff --git a/drivers/ddr/fsl/mpc85xx_ddr_gen3.c b/drivers/ddr/fsl/mpc85xx_ddr_gen3.c
index c805086..4d5572e 100644
--- a/drivers/ddr/fsl/mpc85xx_ddr_gen3.c
+++ b/drivers/ddr/fsl/mpc85xx_ddr_gen3.c
@@ -15,6 +15,7 @@
 #error Invalid setting for CONFIG_CHIP_SELECTS_PER_CTRL
 #endif
 
+DECLARE_GLOBAL_DATA_PTR;
 
 /*
  * regs has the to-be-set values for DDR controller registers
@@ -43,6 +44,16 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
 	u32 save1, save2;
 #endif
 
+#ifdef CONFIG_DEEP_SLEEP
+	const ccsr_gur_t *gur = (void __iomem *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
+	bool sleep_flag = 0;
+#endif
+
+#ifdef CONFIG_DEEP_SLEEP
+	if (in_be32(&gur->scrtsr[0]) & (1 << 3))
+		sleep_flag = 1;
+#endif
+
 	switch (ctrl_num) {
 	case 0:
 		ddr = (void *)CONFIG_SYS_FSL_DDR_ADDR;
@@ -119,7 +130,13 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
 	out_be32(&ddr->timing_cfg_0, regs->timing_cfg_0);
 	out_be32(&ddr->timing_cfg_1, regs->timing_cfg_1);
 	out_be32(&ddr->timing_cfg_2, regs->timing_cfg_2);
-	out_be32(&ddr->sdram_cfg_2, regs->ddr_sdram_cfg_2);
+#ifdef CONFIG_DEEP_SLEEP
+	if (sleep_flag)
+		out_be32(&ddr->sdram_cfg_2,
+			 regs->ddr_sdram_cfg_2 & ~SDRAM_CFG2_D_INIT);
+	else
+#endif
+		out_be32(&ddr->sdram_cfg_2, regs->ddr_sdram_cfg_2);
 	out_be32(&ddr->sdram_mode, regs->ddr_sdram_mode);
 	out_be32(&ddr->sdram_mode_2, regs->ddr_sdram_mode_2);
 	out_be32(&ddr->sdram_mode_3, regs->ddr_sdram_mode_3);
@@ -132,8 +149,16 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
 	out_be32(&ddr->sdram_interval, regs->ddr_sdram_interval);
 	out_be32(&ddr->sdram_data_init, regs->ddr_data_init);
 	out_be32(&ddr->sdram_clk_cntl, regs->ddr_sdram_clk_cntl);
-	out_be32(&ddr->init_addr, regs->ddr_init_addr);
-	out_be32(&ddr->init_ext_addr, regs->ddr_init_ext_addr);
+#ifdef CONFIG_DEEP_SLEEP
+	if (sleep_flag) {
+		out_be32(&ddr->init_addr, 0);
+		out_be32(&ddr->init_ext_addr, (1 << 31));
+	} else
+#endif
+	{
+		out_be32(&ddr->init_addr, regs->ddr_init_addr);
+		out_be32(&ddr->init_ext_addr, regs->ddr_init_ext_addr);
+	}
 
 	out_be32(&ddr->timing_cfg_4, regs->timing_cfg_4);
 	out_be32(&ddr->timing_cfg_5, regs->timing_cfg_5);
@@ -374,8 +399,22 @@ step2:
 	udelay(500);
 	asm volatile("sync;isync");
 
+#ifdef CONFIG_DEEP_SLEEP
+	if (sleep_flag) {
+		/* enter self-refresh */
+		setbits_be32(&ddr->sdram_cfg_2, (1 << 31));
+		/* do board specific memory setup */
+		board_mem_sleep_setup();
+	}
+#endif
+
 	/* Let the controller go */
-	temp_sdram_cfg = in_be32(&ddr->sdram_cfg) & ~SDRAM_CFG_BI;
+#ifdef CONFIG_DEEP_SLEEP
+	if (sleep_flag)
+		temp_sdram_cfg = (in_be32(&ddr->sdram_cfg) | SDRAM_CFG_BI);
+	else
+#endif
+		temp_sdram_cfg = (in_be32(&ddr->sdram_cfg) & ~SDRAM_CFG_BI);
 	out_be32(&ddr->sdram_cfg, temp_sdram_cfg | SDRAM_CFG_MEM_EN);
 	asm volatile("sync;isync");
 
@@ -526,4 +565,9 @@ step2:
 		clrbits_be32(&ddr->sdram_cfg, 0x2);
 	}
 #endif /* CONFIG_SYS_FSL_ERRATUM_DDR111_DDR134 */
+#ifdef CONFIG_DEEP_SLEEP
+	if (sleep_flag)
+		/* exit self-refresh */
+		clrbits_be32(&ddr->sdram_cfg_2, (1 << 31));
+#endif
 }