ls2080: Exit dpaa only right before exiting U-Boot

On ls2080 we have a separate network fabric component which we need to
shut down before we enter Linux (or any other OS). Along with that also
comes configuration of the fabric using a description file.

Today we always stop and configure the fabric in the boot script and
(again) exit it on device tree generation. This works ok for the normal
booti case, but with bootefi the payload we're running may still want to
access the network.

So let's add a new fsl_mc command that defers configuration and stopping
the hardware to when we actually exit U-Boot, so that we can still use
the fabric from an EFI payload.

For existing boot scripts, nothing should change with this patch.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: York Sun <york.sun@nxp.com>
[agraf: Fix x86 build]

1 files changed, 22 insertions, 2 deletions

diff --git a/drivers/net/fsl-mc/mc.c b/drivers/net/fsl-mc/mc.c
index 1811b0fe1a..46b8a6bc69 100644
--- a/drivers/net/fsl-mc/mc.c
+++ b/drivers/net/fsl-mc/mc.c
@@ -40,6 +40,7 @@ int child_dprc_id;
 struct fsl_dpbp_obj *dflt_dpbp = NULL;
 struct fsl_dpio_obj *dflt_dpio = NULL;
 struct fsl_dpni_obj *dflt_dpni = NULL;
+static u64 mc_lazy_dpl_addr;
 
 #ifdef DEBUG
 void dump_ram_words(const char *title, void *addr)
@@ -572,6 +573,9 @@ int mc_apply_dpl(u64 mc_dpl_addr)
 	u64 mc_ram_addr = mc_get_dram_addr();
 	size_t mc_ram_size = mc_get_dram_block_size();
 
+	if (!mc_dpl_addr)
+		return -1;
+
 	error = load_mc_dpl(mc_ram_addr, mc_ram_size, mc_dpl_addr);
 	if (error != 0)
 		return error;
@@ -1156,6 +1160,11 @@ int fsl_mc_ldpaa_exit(bd_t *bd)
 {
 	int err = 0;
 
+	if (bd && mc_lazy_dpl_addr && !fsl_mc_ldpaa_exit(NULL)) {
+		mc_apply_dpl(mc_lazy_dpl_addr);
+		mc_lazy_dpl_addr = 0;
+	}
+
 	/* MC is not loaded intentionally, So return success. */
 	if (bd && get_mc_boot_status() != 0)
 		return 0;
@@ -1259,6 +1268,7 @@ static int do_fsl_mc(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 		}
 		break;
 
+	case 'l':
 	case 'a': {
 			u64 mc_dpl_addr;
 
@@ -1279,8 +1289,17 @@ static int do_fsl_mc(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 				return -ENODEV;
 			}
 
-			if (!fsl_mc_ldpaa_exit(NULL))
-				err = mc_apply_dpl(mc_dpl_addr);
+			if (argv[1][0] == 'l') {
+				/*
+				 * We will do the actual dpaa exit and dpl apply
+				 * later from announce_and_cleanup().
+				 */
+				mc_lazy_dpl_addr = mc_dpl_addr;
+			} else {
+				/* The user wants it applied now */
+				if (!fsl_mc_ldpaa_exit(NULL))
+					err = mc_apply_dpl(mc_dpl_addr);
+			}
 			break;
 		}
 	default:
@@ -1298,5 +1317,6 @@ U_BOOT_CMD(
 	"DPAA2 command to manage Management Complex (MC)",
 	"start mc [FW_addr] [DPC_addr] - Start Management Complex\n"
 	"fsl_mc apply DPL [DPL_addr] - Apply DPL file\n"
+	"fsl_mc lazyapply DPL [DPL_addr] - Apply DPL file on exit\n"
 	"fsl_mc start aiop [FW_addr] - Start AIOP\n"
 );