[PATCH 10/10] drm/xe/nvm: add support for access mode

[Alexander Usyskin <alexander.usyskin@intel.com>]

Check NVM access mode from GSC FW status registers
and overwrite access status read from SPI descriptor, if needed.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
---
 drivers/gpu/drm/xe/regs/xe_gsc_regs.h |  4 ++++
 drivers/gpu/drm/xe/xe_heci_gsc.c      |  5 +---
 drivers/gpu/drm/xe/xe_nvm.c           | 33 ++++++++++++++++++++++++++-
 3 files changed, 37 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/xe/regs/xe_gsc_regs.h b/drivers/gpu/drm/xe/regs/xe_gsc_regs.h
index 7702364b65f1..9b66cc972a63 100644
--- a/drivers/gpu/drm/xe/regs/xe_gsc_regs.h
+++ b/drivers/gpu/drm/xe/regs/xe_gsc_regs.h
@@ -16,6 +16,10 @@
 #define MTL_GSC_HECI1_BASE	0x00116000
 #define MTL_GSC_HECI2_BASE	0x00117000
 
+#define DG1_GSC_HECI2_BASE	0x00259000
+#define PVC_GSC_HECI2_BASE	0x00285000
+#define DG2_GSC_HECI2_BASE	0x00374000
+
 #define HECI_H_CSR(base)	XE_REG((base) + 0x4)
 #define   HECI_H_CSR_IE		REG_BIT(0)
 #define   HECI_H_CSR_IS		REG_BIT(1)
diff --git a/drivers/gpu/drm/xe/xe_heci_gsc.c b/drivers/gpu/drm/xe/xe_heci_gsc.c
index 65b2e147c4b9..27734085164e 100644
--- a/drivers/gpu/drm/xe/xe_heci_gsc.c
+++ b/drivers/gpu/drm/xe/xe_heci_gsc.c
@@ -11,14 +11,11 @@
 #include "xe_device_types.h"
 #include "xe_drv.h"
 #include "xe_heci_gsc.h"
+#include "regs/xe_gsc_regs.h"
 #include "xe_platform_types.h"
 
 #define GSC_BAR_LENGTH  0x00000FFC
 
-#define DG1_GSC_HECI2_BASE			0x259000
-#define PVC_GSC_HECI2_BASE			0x285000
-#define DG2_GSC_HECI2_BASE			0x374000
-
 static void heci_gsc_irq_mask(struct irq_data *d)
 {
 	/* generic irq handling */
diff --git a/drivers/gpu/drm/xe/xe_nvm.c b/drivers/gpu/drm/xe/xe_nvm.c
index ce56bff1268b..fbebe02522c0 100644
--- a/drivers/gpu/drm/xe/xe_nvm.c
+++ b/drivers/gpu/drm/xe/xe_nvm.c
@@ -5,8 +5,11 @@
 
 #include <linux/intel_dg_nvm_aux.h>
 #include <linux/pci.h>
+#include "xe_device.h"
 #include "xe_device_types.h"
+#include "xe_mmio.h"
 #include "xe_nvm.h"
+#include "regs/xe_gsc_regs.h"
 #include "xe_sriov.h"
 
 #define GEN12_GUNIT_NVM_BASE 0x00102040
@@ -24,6 +27,34 @@ static void xe_nvm_release_dev(struct device *dev)
 {
 }
 
+static bool xe_nvm_writeable_override(struct xe_device *xe)
+{
+	struct xe_gt *gt = xe_root_mmio_gt(xe);
+	struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
+	resource_size_t base;
+	bool writeable_override;
+
+	if (xe->info.platform == XE_BATTLEMAGE) {
+		base = DG2_GSC_HECI2_BASE;
+	} else if (xe->info.platform == XE_PVC) {
+		base = PVC_GSC_HECI2_BASE;
+	} else if (xe->info.platform == XE_DG2) {
+		base = DG2_GSC_HECI2_BASE;
+	} else if (xe->info.platform == XE_DG1) {
+		base = DG1_GSC_HECI2_BASE;
+	} else {
+		dev_err(&pdev->dev, "Unknown platform\n");
+		return true;
+	}
+
+	writeable_override =
+		!(xe_mmio_read32(&gt->mmio, HECI_H_GS1(base)) &
+		  HECI_FW_STATUS_2_NVM_ACCESS_MODE);
+	if (writeable_override)
+		dev_info(&pdev->dev, "NVM access overridden by jumper\n");
+	return writeable_override;
+}
+
 void xe_nvm_init(struct xe_device *xe)
 {
 	struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
@@ -48,7 +79,7 @@ void xe_nvm_init(struct xe_device *xe)
 
 	nvm = xe->nvm;
 
-	nvm->writeable_override = false;
+	nvm->writeable_override = xe_nvm_writeable_override(xe);
 	nvm->bar.parent = &pdev->resource[0];
 	nvm->bar.start = GEN12_GUNIT_NVM_BASE + pdev->resource[0].start;
 	nvm->bar.end = nvm->bar.start + GEN12_GUNIT_NVM_SIZE - 1;
-- 
2.43.0