gpu: nvgpu: select ucode boot init by signature

Compute a signature checksum for ctxsw ucode boot section and determine
the format of boot initialization data by it. This unifies gk20a and
gk20b ucode segment loading a lot by separating the bootloader loading
logic to separate functions.

Note: Whenever the boot segment binary changes, its updated signature
must be added here. Management of different bootloaders must be
supported for repo-crossing staging issues.

Bug 1519397

Change-Id: I96f9b905d3631dfdebf71ea3a652a0968615fd0a
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/556679
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 86 insertions, 19 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
index 84b79b42..30ea49a7 100644
--- a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
@@ -1776,9 +1776,17 @@ static int gr_gk20a_copy_ctxsw_ucode_segments(
         u32 *bootimage,
         u32 *code, u32 *data)
 {
+        int i;
+
         memcpy(buf + segments->boot.offset, bootimage, segments->boot.size);
         memcpy(buf + segments->code.offset, code,      segments->code.size);
         memcpy(buf + segments->data.offset, data,      segments->data.size);
+
+        /* compute a "checksum" for the boot binary to detect its version */
+        segments->boot_signature = 0;
+        for (i = 0; i < segments->boot.size / sizeof(u32); i++)
+                segments->boot_signature += bootimage[i];
+
         return 0;
 }
 
@@ -1968,22 +1976,14 @@ void gr_gk20a_load_falcon_bind_instblk(struct gk20a *g)
                 gk20a_err(dev_from_gk20a(g), "arbiter complete timeout");
 }
 
-static int gr_gk20a_load_ctxsw_ucode_segments(struct gk20a *g, u64 addr_base,
+void gr_gk20a_load_ctxsw_ucode_header(struct gk20a *g, u64 addr_base,
         struct gk20a_ctxsw_ucode_segments *segments, u32 reg_offset)
 {
         u32 addr_code32;
         u32 addr_data32;
-        u32 addr_load32;
-        u32 dst = 0;
-        u32 blocks;
-        u32 b;
 
         addr_code32 = u64_lo32((addr_base + segments->code.offset) >> 8);
         addr_data32 = u64_lo32((addr_base + segments->data.offset) >> 8);
-        addr_load32 = u64_lo32((addr_base + segments->boot.offset) >> 8);
-
-        gk20a_writel(g, reg_offset + gr_fecs_dmactl_r(),
-                        gr_fecs_dmactl_require_ctx_f(0));
 
         /*
          * Copy falcon bootloader header into dmem at offset 0.
@@ -1996,17 +1996,73 @@ static int gr_gk20a_load_ctxsw_ucode_segments(struct gk20a *g, u64 addr_base,
                         gr_fecs_dmemc_aincw_f(1));
 
         /* Write out the actual data */
-        gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
-        gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), addr_code32);
-        gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
-        gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), segments->code.size);
-        gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
-        gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), addr_data32);
-        gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), segments->data.size);
-        gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), addr_code32);
-        gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
-        gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+        switch (segments->boot_signature) {
+        case FALCON_UCODE_SIG_T12X_FECS_WITH_RESERVED:
+        case FALCON_UCODE_SIG_T12X_GPCCS_WITH_RESERVED:
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+                /* fallthrough */
+        case FALCON_UCODE_SIG_T12X_FECS_WITHOUT_RESERVED:
+        case FALCON_UCODE_SIG_T12X_GPCCS_WITHOUT_RESERVED:
+        case FALCON_UCODE_SIG_T21X_FECS_WITHOUT_RESERVED:
+        case FALCON_UCODE_SIG_T21X_FECS_WITHOUT_RESERVED2:
+        case FALCON_UCODE_SIG_T21X_GPCCS_WITHOUT_RESERVED:
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 4);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0),
+                                addr_code32);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0),
+                                segments->code.size);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0),
+                                addr_data32);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0),
+                                segments->data.size);
+                break;
+        case FALCON_UCODE_SIG_T12X_FECS_OLDER:
+        case FALCON_UCODE_SIG_T12X_GPCCS_OLDER:
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0),
+                                addr_code32);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0),
+                                segments->code.size);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0),
+                                addr_data32);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0),
+                                segments->data.size);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0),
+                                addr_code32);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+                gk20a_writel(g, reg_offset + gr_fecs_dmemd_r(0), 0);
+                break;
+        default:
+                gk20a_err(dev_from_gk20a(g),
+                                "unknown falcon ucode boot signature 0x%08x"
+                                " with reg_offset 0x%08x",
+                                segments->boot_signature, reg_offset);
+                BUG();
+        }
+}
+
+void gr_gk20a_load_ctxsw_ucode_boot(struct gk20a *g, u64 addr_base,
+        struct gk20a_ctxsw_ucode_segments *segments, u32 reg_offset)
+{
+        u32 addr_load32;
+        u32 blocks;
+        u32 b;
+        u32 dst;
 
+        addr_load32 = u64_lo32((addr_base + segments->boot.offset) >> 8);
         blocks = ((segments->boot.size + 0xFF) & ~0xFF) >> 8;
 
         /*
@@ -2038,6 +2094,17 @@ static int gr_gk20a_load_ctxsw_ucode_segments(struct gk20a *g, u64 addr_base,
         /* Specify the falcon boot vector */
         gk20a_writel(g, reg_offset + gr_fecs_bootvec_r(),
                         gr_fecs_bootvec_vec_f(segments->boot_entry));
+}
+
+int gr_gk20a_load_ctxsw_ucode_segments(struct gk20a *g, u64 addr_base,
+        struct gk20a_ctxsw_ucode_segments *segments, u32 reg_offset)
+{
+        gk20a_writel(g, reg_offset + gr_fecs_dmactl_r(),
+                        gr_fecs_dmactl_require_ctx_f(0));
+
+        /* Copy falcon bootloader into dmem */
+        gr_gk20a_load_ctxsw_ucode_header(g, addr_base, segments, reg_offset);
+        gr_gk20a_load_ctxsw_ucode_boot(g, addr_base, segments, reg_offset);
 
         /* Write to CPUCTL to start the falcon */
         gk20a_writel(g, reg_offset + gr_fecs_cpuctl_r(),