From: Alex Deucher <alexander.deucher@xxxxxxx>
Encapsulates the i2c protocol handling so other parts of the
driver can just tell it the offset and size of data to write.
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Reviewed-by: Luben Tuikov <luben.tuikov@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/Makefile | 3 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_eeprom.c | 67 ++++++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_eeprom.h | 34 +++++++++++
3 files changed, 103 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_eeprom.c
create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_eeprom.h
diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
index c56320e78c0e1f..7d292485ca7cf2 100644
--- a/drivers/gpu/drm/amd/amdgpu/Makefile
+++ b/drivers/gpu/drm/amd/amdgpu/Makefile
@@ -57,7 +57,8 @@ amdgpu-y += amdgpu_device.o amdgpu_kms.o \
amdgpu_xgmi.o amdgpu_csa.o amdgpu_ras.o amdgpu_vm_cpu.o \
amdgpu_vm_sdma.o amdgpu_discovery.o amdgpu_ras_eeprom.o amdgpu_nbio.o \
amdgpu_umc.o smu_v11_0_i2c.o amdgpu_fru_eeprom.o amdgpu_rap.o \
- amdgpu_fw_attestation.o amdgpu_securedisplay.o amdgpu_hdp.o
+ amdgpu_fw_attestation.o amdgpu_securedisplay.o amdgpu_hdp.o \
+ amdgpu_eeprom.o
amdgpu-$(CONFIG_PROC_FS) += amdgpu_fdinfo.o
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_eeprom.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_eeprom.c
new file mode 100644
index 00000000000000..10551660343278
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_eeprom.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2021 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include "amdgpu_eeprom.h"
+#include "amdgpu.h"
+
+#define EEPROM_OFFSET_LENGTH 2
+
+int amdgpu_eeprom_xfer(struct i2c_adapter *i2c_adap,
+ u16 slave_addr, u16 eeprom_addr,
+ u8 *eeprom_buf, u16 bytes, bool read)
+{
+ u8 eeprom_offset_buf[2];
+ u16 bytes_transferred;
+ struct i2c_msg msgs[] = {
+ {
+ .addr = slave_addr,
+ .flags = 0,
+ .len = EEPROM_OFFSET_LENGTH,
+ .buf = eeprom_offset_buf,
+ },
+ {
+ .addr = slave_addr,
+ .flags = read ? I2C_M_RD: 0,
+ .len = bytes,
+ .buf = eeprom_buf,
+ }
+ };
+ int r;
+
+ msgs[0].buf[0] = ((eeprom_addr >> 8) & 0xff);
+ msgs[0].buf[1] = (eeprom_addr & 0xff);
+
+ while (msgs[1].len) {
+ r = i2c_transfer(i2c_adap, msgs, ARRAY_SIZE(msgs));
+ if (r <= 0)
+ return r;
+ bytes_transferred = r - EEPROM_OFFSET_LENGTH;
+ eeprom_addr += bytes_transferred;
+ msgs[0].buf[0] = ((eeprom_addr >> 8) & 0xff);
+ msgs[0].buf[1] = (eeprom_addr & 0xff);
+ msgs[1].buf += bytes_transferred;
+ msgs[1].len -= bytes_transferred;
+ }
+
+ return 0;
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_eeprom.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_eeprom.h
new file mode 100644
index 00000000000000..9301e5678910ad
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_eeprom.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2021 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef _AMDGPU_EEPROM_H
+#define _AMDGPU_EEPROM_H
+
+#include <linux/i2c.h>
+
+int amdgpu_eeprom_xfer(struct i2c_adapter *i2c_adap,
+ u16 slave_addr, u16 eeprom_addr,
+ u8 *eeprom_buf, u16 bytes, bool read);
+
+
+#endif
--
2.32.0
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