powerpc/corenet_ds: Master module for boot from PCIE

For the powerpc processors with PCIE interface, boot location can be
configured from one PCIE interface by RCW. The processor booting from PCIE
can do without flash for u-boot image. The image can be fetched from another
processor's memory space by PCIE link connected between them.

The processor booting from PCIE is slave, the processor booting from normal
flash memory space is master, and it can help slave to boot from master's
memory space.

When boot from PCIE, slave's core should be in holdoff after powered on for
some specific requirements. Master will release the slave's core at the
right time by PCIE interface.

Environment and requirement:

master:
    1. NOR flash for its own u-boot image, ucode and ENV space.
    2. Slave's u-boot image is in master NOR flash.
    3. Normally boot from local NOR flash.
    4. Configure PCIE system if needed.
slave:
    1. Just has EEPROM for RCW. No flash for u-boot image, ucode and ENV.
    2. Boot location should be set to one PCIE interface by RCW.
    3. RCW should configure the SerDes, PCIE interfaces correctly.
	4. Must set all the cores in holdoff by RCW.
	5. Must be powered on before master's boot.

For the master module, need to finish these processes:
    1. Initialize the PCIE port and address space.
    2. Set inbound PCIE windows covered slave's u-boot image stored in
       master's NOR flash.
	3. Set outbound windows in order to configure slave's registers
	   for the core's releasing.
    4. Should set the environment variable "bootmaster" to "PCIE1", "PCIE2"
	   or "PCIE3" using the following command:

			setenv bootmaster PCIE1
			saveenv

Signed-off-by: Liu Gang <Gang.Liu@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>

1 files changed, 116 insertions, 0 deletions

diff --git a/drivers/pci/fsl_pci_init.c b/drivers/pci/fsl_pci_init.c
index 1d75a82bc3..0d46c96312 100644
--- a/drivers/pci/fsl_pci_init.c
+++ b/drivers/pci/fsl_pci_init.c
@@ -211,6 +211,95 @@ static int fsl_pci_setup_inbound_windows(struct pci_controller *hose,
 	return 1;
 }
 
+#ifdef CONFIG_FSL_CORENET
+static void fsl_pcie_boot_master(pit_t *pi)
+{
+	/* configure inbound window for slave's u-boot image */
+	debug("PCIEBOOT - MASTER: Inbound window for slave's image; "
+			"Local = 0x%llx, Bus = 0x%llx, Size = 0x%x\n",
+			(u64)CONFIG_SRIO_PCIE_BOOT_IMAGE_MEM_PHYS,
+			(u64)CONFIG_SRIO_PCIE_BOOT_IMAGE_MEM_BUS1,
+			CONFIG_SRIO_PCIE_BOOT_IMAGE_SIZE);
+	struct pci_region r_inbound;
+	u32 sz_inbound = __ilog2_u64(CONFIG_SRIO_PCIE_BOOT_IMAGE_SIZE)
+					- 1;
+	pci_set_region(&r_inbound,
+		CONFIG_SRIO_PCIE_BOOT_IMAGE_MEM_BUS1,
+		CONFIG_SRIO_PCIE_BOOT_IMAGE_MEM_PHYS,
+		sz_inbound,
+		PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
+
+	set_inbound_window(pi--, &r_inbound,
+		CONFIG_SRIO_PCIE_BOOT_IMAGE_SIZE);
+
+	/* configure inbound window for slave's u-boot image */
+	debug("PCIEBOOT - MASTER: Inbound window for slave's image; "
+			"Local = 0x%llx, Bus = 0x%llx, Size = 0x%x\n",
+			(u64)CONFIG_SRIO_PCIE_BOOT_IMAGE_MEM_PHYS,
+			(u64)CONFIG_SRIO_PCIE_BOOT_IMAGE_MEM_BUS2,
+			CONFIG_SRIO_PCIE_BOOT_IMAGE_SIZE);
+	pci_set_region(&r_inbound,
+		CONFIG_SRIO_PCIE_BOOT_IMAGE_MEM_BUS2,
+		CONFIG_SRIO_PCIE_BOOT_IMAGE_MEM_PHYS,
+		sz_inbound,
+		PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
+
+	set_inbound_window(pi--, &r_inbound,
+		CONFIG_SRIO_PCIE_BOOT_IMAGE_SIZE);
+
+	/* configure inbound window for slave's ucode and ENV */
+	debug("PCIEBOOT - MASTER: Inbound window for slave's "
+			"ucode and ENV; "
+			"Local = 0x%llx, Bus = 0x%llx, Size = 0x%x\n",
+			(u64)CONFIG_SRIO_PCIE_BOOT_UCODE_ENV_MEM_PHYS,
+			(u64)CONFIG_SRIO_PCIE_BOOT_UCODE_ENV_MEM_BUS,
+			CONFIG_SRIO_PCIE_BOOT_UCODE_ENV_SIZE);
+	sz_inbound = __ilog2_u64(CONFIG_SRIO_PCIE_BOOT_UCODE_ENV_SIZE)
+				- 1;
+	pci_set_region(&r_inbound,
+		CONFIG_SRIO_PCIE_BOOT_UCODE_ENV_MEM_BUS,
+		CONFIG_SRIO_PCIE_BOOT_UCODE_ENV_MEM_PHYS,
+		sz_inbound,
+		PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
+
+	set_inbound_window(pi--, &r_inbound,
+		CONFIG_SRIO_PCIE_BOOT_UCODE_ENV_SIZE);
+}
+
+static void fsl_pcie_boot_master_release_slave(int port)
+{
+	unsigned long release_addr;
+
+	/* now release slave's core 0 */
+	switch (port) {
+	case 1:
+		release_addr = CONFIG_SYS_PCIE1_MEM_VIRT
+			+ CONFIG_SRIO_PCIE_BOOT_BRR_OFFSET;
+		break;
+	case 2:
+		release_addr = CONFIG_SYS_PCIE2_MEM_VIRT
+			+ CONFIG_SRIO_PCIE_BOOT_BRR_OFFSET;
+		break;
+	case 3:
+		release_addr = CONFIG_SYS_PCIE3_MEM_VIRT
+			+ CONFIG_SRIO_PCIE_BOOT_BRR_OFFSET;
+		break;
+	default:
+		release_addr = 0;
+		break;
+	}
+	if (release_addr != 0) {
+		out_be32((void *)release_addr,
+			CONFIG_SRIO_PCIE_BOOT_RELEASE_MASK);
+		debug("PCIEBOOT - MASTER: "
+			"Release slave successfully! Now the slave should start up!\n");
+	} else {
+		debug("PCIEBOOT - MASTER: "
+			"Release slave failed!\n");
+	}
+}
+#endif
+
 void fsl_pci_init(struct pci_controller *hose, struct fsl_pci_info *pci_info)
 {
 	u32 cfg_addr = (u32)&((ccsr_fsl_pci_t *)pci_info->regs)->cfg_addr;
@@ -295,8 +384,25 @@ void fsl_pci_init(struct pci_controller *hose, struct fsl_pci_info *pci_info)
 	/* see if we are a PCIe or PCI controller */
 	pci_hose_read_config_byte(hose, dev, FSL_PCIE_CAP_ID, &pcie_cap);
 
+#ifdef CONFIG_FSL_CORENET
+	/* boot from PCIE --master */
+	char *s = getenv("bootmaster");
+	char pcie[6];
+	sprintf(pcie, "PCIE%d", pci_info->pci_num);
+
+	if (s && (strcmp(s, pcie) == 0)) {
+		debug("PCIEBOOT - MASTER: Master port [ %d ] for pcie boot.\n",
+				pci_info->pci_num);
+		fsl_pcie_boot_master((pit_t *)pi);
+	} else {
+		/* inbound */
+		inbound = fsl_pci_setup_inbound_windows(hose,
+					out_lo, pcie_cap, pi);
+	}
+#else
 	/* inbound */
 	inbound = fsl_pci_setup_inbound_windows(hose, out_lo, pcie_cap, pi);
+#endif
 
 	for (r = 0; r < hose->region_count; r++)
 		debug("PCI reg:%d %016llx:%016llx %016llx %08lx\n", r,
@@ -488,6 +594,16 @@ int fsl_pci_init_port(struct fsl_pci_info *pci_info,
 	if (fsl_is_pci_agent(hose)) {
 		fsl_pci_config_unlock(hose);
 		hose->last_busno = hose->first_busno;
+#ifdef CONFIG_FSL_CORENET
+	} else {
+		/* boot from PCIE --master releases slave's core 0 */
+		char *s = getenv("bootmaster");
+		char pcie[6];
+		sprintf(pcie, "PCIE%d", pci_info->pci_num);
+
+		if (s && (strcmp(s, pcie) == 0))
+			fsl_pcie_boot_master_release_slave(pci_info->pci_num);
+#endif
 	}
 
 	pci_hose_read_config_byte(hose, dev, FSL_PCIE_CAP_ID, &pcie_cap);