nxp: ls102xa: add LS1 PSCI system suspend

The deep sleep function of LS1 platform, is mapped into PSCI system
suspend function, this patch adds implementation of it.

Signed-off-by: Hongbo Zhang <hongbo.zhang@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>

3 files changed, 248 insertions, 1 deletions

diff --git a/arch/arm/cpu/armv7/ls102xa/Makefile b/arch/arm/cpu/armv7/ls102xa/Makefile
index 0228300..f8300c7 100644
--- a/arch/arm/cpu/armv7/ls102xa/Makefile
+++ b/arch/arm/cpu/armv7/ls102xa/Makefile
@@ -16,5 +16,5 @@ obj-$(CONFIG_SYS_HAS_SERDES) += fsl_ls1_serdes.o ls102xa_serdes.o
 obj-$(CONFIG_SPL) += spl.o
 
 ifdef CONFIG_ARMV7_PSCI
-obj-y  += psci.o
+obj-y  += psci.o ls102xa_psci.o
 endif
diff --git a/arch/arm/cpu/armv7/ls102xa/ls102xa_psci.c b/arch/arm/cpu/armv7/ls102xa/ls102xa_psci.c
new file mode 100644
index 0000000..2ac2e6c
--- /dev/null
+++ b/arch/arm/cpu/armv7/ls102xa/ls102xa_psci.c
@@ -0,0 +1,236 @@
+/*
+ * Copyright 2016 Freescale Semiconductor, Inc.
+ * Author: Hongbo Zhang <hongbo.zhang@nxp.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ * This file implements LS102X platform PSCI SYSTEM-SUSPEND function
+ */
+
+#include <config.h>
+#include <asm/io.h>
+#include <asm/psci.h>
+#include <asm/arch/immap_ls102xa.h>
+#include <fsl_immap.h>
+#include "fsl_epu.h"
+
+#define __secure __attribute__((section("._secure.text")))
+
+#define CCSR_GICD_CTLR			0x1000
+#define CCSR_GICC_CTLR			0x2000
+#define DCSR_RCPM_CG1CR0		0x31c
+#define DCSR_RCPM_CSTTACR0		0xb00
+#define DCFG_CRSTSR_WDRFR		0x8
+#define DDR_RESV_LEN			128
+
+#ifdef CONFIG_LS1_DEEP_SLEEP
+/*
+ * DDR controller initialization training breaks the first 128 bytes of DDR,
+ * save them so that the bootloader can restore them while resuming.
+ */
+static void __secure ls1_save_ddr_head(void)
+{
+	const char *src = (const char *)CONFIG_SYS_SDRAM_BASE;
+	char *dest = (char *)(OCRAM_BASE_S_ADDR + OCRAM_S_SIZE - DDR_RESV_LEN);
+	struct ccsr_scfg __iomem *scfg = (void *)CONFIG_SYS_FSL_SCFG_ADDR;
+	int i;
+
+	out_le32(&scfg->sparecr[2], dest);
+
+	for (i = 0; i < DDR_RESV_LEN; i++)
+		*dest++ = *src++;
+}
+
+static void __secure ls1_fsm_setup(void)
+{
+	void *dcsr_epu_base = (void *)(CONFIG_SYS_DCSRBAR + EPU_BLOCK_OFFSET);
+	void *dcsr_rcpm_base = (void *)CONFIG_SYS_DCSR_RCPM_ADDR;
+
+	out_be32(dcsr_rcpm_base + DCSR_RCPM_CSTTACR0, 0x00001001);
+	out_be32(dcsr_rcpm_base + DCSR_RCPM_CG1CR0, 0x00000001);
+
+	fsl_epu_setup((void *)dcsr_epu_base);
+
+	/* Pull MCKE signal low before enabling deep sleep signal in FPGA */
+	out_be32(dcsr_epu_base + EPECR0, 0x5);
+	out_be32(dcsr_epu_base + EPSMCR15, 0x76300000);
+}
+
+static void __secure ls1_deepsleep_irq_cfg(void)
+{
+	struct ccsr_scfg __iomem *scfg = (void *)CONFIG_SYS_FSL_SCFG_ADDR;
+	struct ccsr_rcpm __iomem *rcpm = (void *)CONFIG_SYS_FSL_RCPM_ADDR;
+	u32 ippdexpcr0, ippdexpcr1, pmcintecr = 0;
+
+	/* Mask interrupts from GIC */
+	out_be32(&rcpm->nfiqoutr, 0x0ffffffff);
+	out_be32(&rcpm->nirqoutr, 0x0ffffffff);
+	/* Mask deep sleep wake-up interrupts while entering deep sleep */
+	out_be32(&rcpm->dsimskr, 0x0ffffffff);
+
+	ippdexpcr0 = in_be32(&rcpm->ippdexpcr0);
+	/*
+	 * Workaround: There is bug of register ippdexpcr1, when read it always
+	 * returns zero, so its value is saved to a scrachpad register to be
+	 * read, that is why we don't read it from register ippdexpcr1 itself.
+	 */
+	ippdexpcr1 = in_le32(&scfg->sparecr[7]);
+
+	if (ippdexpcr0 & RCPM_IPPDEXPCR0_ETSEC)
+		pmcintecr |= SCFG_PMCINTECR_ETSECRXG0 |
+			     SCFG_PMCINTECR_ETSECRXG1 |
+			     SCFG_PMCINTECR_ETSECERRG0 |
+			     SCFG_PMCINTECR_ETSECERRG1;
+
+	if (ippdexpcr0 & RCPM_IPPDEXPCR0_GPIO)
+		pmcintecr |= SCFG_PMCINTECR_GPIO;
+
+	if (ippdexpcr1 & RCPM_IPPDEXPCR1_LPUART)
+		pmcintecr |= SCFG_PMCINTECR_LPUART;
+
+	if (ippdexpcr1 & RCPM_IPPDEXPCR1_FLEXTIMER)
+		pmcintecr |= SCFG_PMCINTECR_FTM;
+
+	/* Always set external IRQ pins as wakeup source */
+	pmcintecr |= SCFG_PMCINTECR_IRQ0 | SCFG_PMCINTECR_IRQ1;
+
+	out_be32(&scfg->pmcintlecr, 0);
+	/* Clear PMC interrupt status */
+	out_be32(&scfg->pmcintsr, 0xffffffff);
+	/* Enable wakeup interrupt during deep sleep */
+	out_be32(&scfg->pmcintecr, pmcintecr);
+}
+
+static void __secure ls1_delay(unsigned int loop)
+{
+	while (loop--) {
+		int i = 1000;
+		while (i--)
+			;
+	}
+}
+
+static void __secure ls1_start_fsm(void)
+{
+	void *dcsr_epu_base = (void *)(CONFIG_SYS_DCSRBAR + EPU_BLOCK_OFFSET);
+	void *ccsr_gic_base = (void *)CONFIG_SYS_GIC_ADDR;
+	struct ccsr_scfg __iomem *scfg = (void *)CONFIG_SYS_FSL_SCFG_ADDR;
+	struct ccsr_ddr __iomem *ddr = (void *)CONFIG_SYS_FSL_DDR_ADDR;
+
+	/* Set HRSTCR */
+	setbits_be32(&scfg->hrstcr, 0x80000000);
+
+	/* Place DDR controller in self refresh mode */
+	setbits_be32(&ddr->sdram_cfg_2, 0x80000000);
+
+	ls1_delay(2000);
+
+	/* Set EVT4_B to lock the signal MCKE down */
+	out_be32(dcsr_epu_base + EPECR0, 0x0);
+
+	ls1_delay(2000);
+
+	out_be32(ccsr_gic_base + CCSR_GICD_CTLR, 0x0);
+	out_be32(ccsr_gic_base + CCSR_GICC_CTLR, 0x0);
+
+	/* Enable all EPU Counters */
+	setbits_be32(dcsr_epu_base + EPGCR, 0x80000000);
+
+	/* Enable SCU15 */
+	setbits_be32(dcsr_epu_base + EPECR15, 0x90000004);
+
+	/* Enter WFI mode, and EPU FSM will start */
+	__asm__ __volatile__ ("wfi" : : : "memory");
+
+	/* NEVER ENTER HERE */
+	while (1)
+		;
+}
+
+static void __secure ls1_deep_sleep(u32 entry_point)
+{
+	struct ccsr_scfg __iomem *scfg = (void *)CONFIG_SYS_FSL_SCFG_ADDR;
+	struct ccsr_gur __iomem *gur = (void *)CONFIG_SYS_FSL_GUTS_ADDR;
+	struct ccsr_rcpm __iomem *rcpm = (void *)CONFIG_SYS_FSL_RCPM_ADDR;
+#ifdef QIXIS_BASE
+	u32 tmp;
+	void *qixis_base = (void *)QIXIS_BASE;
+#endif
+
+	/* Enable cluster to enter the PCL10 state */
+	out_be32(&scfg->clusterpmcr, SCFG_CLUSTERPMCR_WFIL2EN);
+
+	/* Save the first 128 bytes of DDR data */
+	ls1_save_ddr_head();
+
+	/* Save the kernel resume entry */
+	out_le32(&scfg->sparecr[3], entry_point);
+
+	/* Request to put cluster 0 in PCL10 state */
+	setbits_be32(&rcpm->clpcl10setr, RCPM_CLPCL10SETR_C0);
+
+	/* Setup the registers of the EPU FSM for deep sleep */
+	ls1_fsm_setup();
+
+#ifdef QIXIS_BASE
+	/* Connect the EVENT button to IRQ in FPGA */
+	tmp = in_8(qixis_base + QIXIS_CTL_SYS);
+	tmp &= ~QIXIS_CTL_SYS_EVTSW_MASK;
+	tmp |= QIXIS_CTL_SYS_EVTSW_IRQ;
+	out_8(qixis_base + QIXIS_CTL_SYS, tmp);
+
+	/* Enable deep sleep signals in FPGA */
+	tmp = in_8(qixis_base + QIXIS_PWR_CTL2);
+	tmp |= QIXIS_PWR_CTL2_PCTL;
+	out_8(qixis_base + QIXIS_PWR_CTL2, tmp);
+
+	/* Pull down PCIe RST# */
+	tmp = in_8(qixis_base + QIXIS_RST_FORCE_3);
+	tmp |= QIXIS_RST_FORCE_3_PCIESLOT1;
+	out_8(qixis_base + QIXIS_RST_FORCE_3, tmp);
+#endif
+
+	/* Enable Warm Device Reset */
+	setbits_be32(&scfg->dpslpcr, SCFG_DPSLPCR_WDRR_EN);
+	setbits_be32(&gur->crstsr, DCFG_CRSTSR_WDRFR);
+
+	ls1_deepsleep_irq_cfg();
+
+	psci_v7_flush_dcache_all();
+
+	ls1_start_fsm();
+}
+
+#else
+static void __secure ls1_sleep(void)
+{
+	struct ccsr_scfg __iomem *scfg = (void *)CONFIG_SYS_FSL_SCFG_ADDR;
+	struct ccsr_rcpm __iomem *rcpm = (void *)CONFIG_SYS_FSL_RCPM_ADDR;
+
+#ifdef QIXIS_BASE
+	u32 tmp;
+	void *qixis_base = (void *)QIXIS_BASE;
+
+	/* Connect the EVENT button to IRQ in FPGA */
+	tmp = in_8(qixis_base + QIXIS_CTL_SYS);
+	tmp &= ~QIXIS_CTL_SYS_EVTSW_MASK;
+	tmp |= QIXIS_CTL_SYS_EVTSW_IRQ;
+	out_8(qixis_base + QIXIS_CTL_SYS, tmp);
+#endif
+
+	/* Enable cluster to enter the PCL10 state */
+	out_be32(&scfg->clusterpmcr, SCFG_CLUSTERPMCR_WFIL2EN);
+
+	setbits_be32(&rcpm->powmgtcsr, RCPM_POWMGTCSR_LPM20_REQ);
+
+	__asm__ __volatile__ ("wfi" : : : "memory");
+}
+#endif
+
+void __secure ls1_system_suspend(u32 fn, u32 entry_point, u32 context_id)
+{
+#ifdef CONFIG_LS1_DEEP_SLEEP
+	ls1_deep_sleep(entry_point);
+#else
+	ls1_sleep();
+#endif
+}
diff --git a/arch/arm/cpu/armv7/ls102xa/psci.S b/arch/arm/cpu/armv7/ls102xa/psci.S
index 8f38680..3d41d37 100644
--- a/arch/arm/cpu/armv7/ls102xa/psci.S
+++ b/arch/arm/cpu/armv7/ls102xa/psci.S
@@ -29,6 +29,7 @@
 #define PSCI_FN_AFFINITY_INFO_FEATURE_MASK	0x0
 #define PSCI_FN_SYSTEM_OFF_FEATURE_MASK		0x0
 #define PSCI_FN_SYSTEM_RESET_FEATURE_MASK	0x0
+#define PSCI_FN_SYSTEM_SUSPEND_FEATURE_MASK	0x0
 
 	.pushsection ._secure.text, "ax"
 
@@ -61,6 +62,8 @@ _ls102x_psci_supported_table:
 	.word	PSCI_FN_SYSTEM_OFF_FEATURE_MASK
 	.word	ARM_PSCI_0_2_FN_SYSTEM_RESET
 	.word	PSCI_FN_SYSTEM_RESET_FEATURE_MASK
+	.word	ARM_PSCI_1_0_FN_SYSTEM_SUSPEND
+	.word	PSCI_FN_SYSTEM_SUSPEND_FEATURE_MASK
 	.word	0
 	.word	ARM_PSCI_RET_NI
 
@@ -243,4 +246,12 @@ psci_system_reset:
 1:	wfi
 	b	1b
 
+.globl	psci_system_suspend
+psci_system_suspend:
+	push	{lr}
+
+	bl	ls1_system_suspend
+
+	pop	{pc}
+
 	.popsection