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]

arch/arm/include/asm/u-boot-arm.h

@@ -37,6 +37,7 @@ int	arch_early_init_r(void);
 /* board/.../... */
 int	board_init(void);
 void	dram_init_banksize (void);
+void	board_quiesce_devices(void);
 
 /* cpu/.../interrupt.c */
 int	arch_interrupt_init	(void);

arch/arm/lib/bootm.c

@@ -64,6 +64,10 @@ void arch_lmb_reserve(struct lmb *lmb)
 		    gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
 }
 
+__weak void board_quiesce_devices(void)
+{
+}
+
 /**
  * announce_and_cleanup() - Print message and prepare for kernel boot
  *
@@ -84,6 +88,9 @@ static void announce_and_cleanup(int fake)
 #ifdef CONFIG_USB_DEVICE
 	udc_disconnect();
 #endif
+
+	board_quiesce_devices();
+
 	cleanup_before_linux();
 }
 

arch/x86/include/asm/u-boot-x86.h

@@ -74,6 +74,7 @@ static inline __attribute__((no_instrument_function)) uint64_t rdtsc(void)
 /* board/... */
 void timer_set_tsc_base(uint64_t new_base);
 uint64_t timer_get_tsc(void);
+void board_quiesce_devices(void);
 
 void quick_ram_check(void);
 

arch/x86/lib/bootm.c

@@ -26,6 +26,10 @@ DECLARE_GLOBAL_DATA_PTR;
 
 #define COMMAND_LINE_OFFSET 0x9000
 
+__weak void board_quiesce_devices(void)
+{
+}
+
 void bootm_announce_and_cleanup(void)
 {
 	printf("\nStarting kernel ...\n\n");

board/freescale/ls2080a/ls2080a.c

@@ -102,6 +102,11 @@ void fdt_fixup_board_enet(void *fdt)
 	else
 		fdt_status_fail(fdt, offset);
 }
+
+void board_quiesce_devices(void)
+{
+	fsl_mc_ldpaa_exit(gd->bd);
+}
 #endif
 
 #ifdef CONFIG_OF_BOARD_SETUP
@@ -122,7 +127,6 @@ int ft_board_setup(void *blob, bd_t *bd)
 
 #ifdef CONFIG_FSL_MC_ENET
 	fdt_fixup_board_enet(blob);
-	fsl_mc_ldpaa_exit(bd);
 #endif
 
 	return 0;

board/freescale/ls2080aqds/ls2080aqds.c

@@ -292,14 +292,16 @@ void fdt_fixup_board_enet(void *fdt)
 	else
 		fdt_status_fail(fdt, offset);
 }
+
+void board_quiesce_devices(void)
+{
+	fsl_mc_ldpaa_exit(gd->bd);
+}
 #endif
 
 #ifdef CONFIG_OF_BOARD_SETUP
 int ft_board_setup(void *blob, bd_t *bd)
 {
-#ifdef CONFIG_FSL_MC_ENET
-	int err;
-#endif
 	u64 base[CONFIG_NR_DRAM_BANKS];
 	u64 size[CONFIG_NR_DRAM_BANKS];
 
@@ -317,9 +319,6 @@ int ft_board_setup(void *blob, bd_t *bd)
 
 #ifdef CONFIG_FSL_MC_ENET
 	fdt_fixup_board_enet(blob);
-	err = fsl_mc_ldpaa_exit(bd);
-	if (err)
-		return err;
 #endif
 
 	return 0;

board/freescale/ls2080ardb/ls2080ardb.c

@@ -256,14 +256,16 @@ void fdt_fixup_board_enet(void *fdt)
 	else
 		fdt_status_fail(fdt, offset);
 }
+
+void board_quiesce_devices(void)
+{
+	fsl_mc_ldpaa_exit(gd->bd);
+}
 #endif
 
 #ifdef CONFIG_OF_BOARD_SETUP
 int ft_board_setup(void *blob, bd_t *bd)
 {
-#ifdef CONFIG_FSL_MC_ENET
-	int err;
-#endif
 	u64 base[CONFIG_NR_DRAM_BANKS];
 	u64 size[CONFIG_NR_DRAM_BANKS];
 
@@ -281,9 +283,6 @@ int ft_board_setup(void *blob, bd_t *bd)
 
 #ifdef CONFIG_FSL_MC_ENET
 	fdt_fixup_board_enet(blob);
-	err = fsl_mc_ldpaa_exit(bd);
-	if (err)
-		return err;
 #endif
 
 	return 0;

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"
 );

lib/efi_loader/efi_boottime.c

@@ -538,6 +538,8 @@ static efi_status_t EFIAPI efi_exit_boot_services(void *image_handle,
 {
 	EFI_ENTRY("%p, %ld", image_handle, map_key);
 
+	board_quiesce_devices();
+
 	/* Fix up caches for EFI payloads if necessary */
 	efi_exit_caches();