[PATCH 1/8] drm/loongson: Introduce a minimal support for Loongson VBIOS
From: Sui Jingfeng
Date: Sun Oct 29 2023 - 15:46:19 EST
Because some boards are equipped with non-transparent display bridges,
which need the VBIOS to provided parameters.
Signed-off-by: Sui Jingfeng <suijingfeng@xxxxxxxxxxx>
---
drivers/gpu/drm/loongson/Makefile | 3 +-
drivers/gpu/drm/loongson/loongson_device.c | 4 +
drivers/gpu/drm/loongson/loongson_vbios.c | 420 +++++++++++++++++++++
drivers/gpu/drm/loongson/loongson_vbios.h | 59 +++
drivers/gpu/drm/loongson/lsdc_drv.c | 4 +
drivers/gpu/drm/loongson/lsdc_drv.h | 8 +
6 files changed, 497 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/loongson/loongson_vbios.c
create mode 100644 drivers/gpu/drm/loongson/loongson_vbios.h
diff --git a/drivers/gpu/drm/loongson/Makefile b/drivers/gpu/drm/loongson/Makefile
index 91e72bd900c1..bef00b2c5569 100644
--- a/drivers/gpu/drm/loongson/Makefile
+++ b/drivers/gpu/drm/loongson/Makefile
@@ -17,6 +17,7 @@ loongson-y := \
lsdc_ttm.o
loongson-y += loongson_device.o \
- loongson_module.o
+ loongson_module.o \
+ loongson_vbios.o
obj-$(CONFIG_DRM_LOONGSON) += loongson.o
diff --git a/drivers/gpu/drm/loongson/loongson_device.c b/drivers/gpu/drm/loongson/loongson_device.c
index 9986c8a2a255..64096ad5466e 100644
--- a/drivers/gpu/drm/loongson/loongson_device.c
+++ b/drivers/gpu/drm/loongson/loongson_device.c
@@ -7,6 +7,8 @@
#include "lsdc_drv.h"
+extern struct loongson_vbios __loongson_vbios;
+
static const struct lsdc_kms_funcs ls7a1000_kms_funcs = {
.create_i2c = lsdc_create_i2c_chan,
.irq_handler = ls7a1000_dc_irq_handler,
@@ -53,6 +55,7 @@ static const struct loongson_gfx_desc ls7a1000_gfx = {
.reg_size = 8,
},
},
+ .vbios = &__loongson_vbios,
.chip_id = CHIP_LS7A1000,
.model = "LS7A1000 bridge chipset",
};
@@ -85,6 +88,7 @@ static const struct loongson_gfx_desc ls7a2000_gfx = {
.reg_size = 8,
},
},
+ .vbios = &__loongson_vbios,
.chip_id = CHIP_LS7A2000,
.model = "LS7A2000 bridge chipset",
};
diff --git a/drivers/gpu/drm/loongson/loongson_vbios.c b/drivers/gpu/drm/loongson/loongson_vbios.c
new file mode 100644
index 000000000000..dc304018779e
--- /dev/null
+++ b/drivers/gpu/drm/loongson/loongson_vbios.c
@@ -0,0 +1,420 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2023 Loongson Technology Corporation Limited
+ */
+
+#include <drm/drm_device.h>
+#include <drm/drm_managed.h>
+
+#include "loongson_vbios.h"
+#include "lsdc_drv.h"
+
+#define LOONGSON_VBIOS_HEADER_STR "Loongson-VBIOS"
+/* Legacy VBIOS is stored at offset 0 */
+#define LOONGSON_VBIOS_LEGACY_OFFSET 0
+/* The size of legacy VBIOS is 1 KiB */
+#define LOONGSON_VBIOS_LEGACY_SIZE 0x000400
+
+/* Data Control Block of Newer version of the VBIOS started at here */
+#define LOONGSON_VBIOS_DCB_OFFSET 0x006000
+/* The last 1 MiB of the VRAM contains the raw VBIOS data */
+#define LOONGSON_VBIOS_BLOCK_OFFSET 0x100000
+/* Only 256KB of the 1 MiB are used for now */
+#define LOONGSON_VBIOS_BLOCK_SIZE 0x040000
+
+struct loongson_vbios __loongson_vbios;
+
+/*
+ * vbios data control block is a kind of metadata, which is used to index
+ * real hardware device data block.
+ */
+struct loongson_vbios_dcb {
+ u16 type; /* what is it */
+ u8 version; /* version of it, useless */
+ u8 id; /* index (usually same with the display pipe) of the hardware */
+ u32 offset; /* the offset of the real data */
+ u32 size; /* the size of the real data */
+ u64 ext0; /* for extension purpose */
+ u64 ext1; /* extra space reserved for future use */
+} __packed;
+
+/*
+ * Loongson-VBIOS Data Block Layout
+ *
+ *
+ * _____________________ 0x00000
+ * |_____________________|
+ * | | [0x0000, 0x0400) : legacy vbios storage
+ * | Not Used Yet |
+ * | |
+ * |---------------------|<------- 0x6000
+ * +----| DCB 0 |
+ * | |---------------------|
+ * | | DCB 1 |
+ * | |---------------------| Format of Data Control Blocks
+ * | | One by one, packed | +------------+
+ * | |---------------------| | u16 type |
+ * | | DCB N |----+ | |
+ * | |---------------------| | +------------+
+ * | | . | | | u8 version |
+ * | | . | | | u8 index |
+ * | | . | | +------------+
+ * | |---------------------| | | |
+ * | | DCB end | | | u32 offset |
+ * | |---------------------| | +------- |
+ * | | | | | | |
+ * | |_____________________| | | +------------+
+ * | |_____________________| | | | |
+ * | | | | | | u32 size |
+ * +--->| vbios header info | | | | -------+
+ * |_____________________| | | | | |
+ * | . | | | +------------+ |
+ * | . | | | | useless | |
+ * | . | | | | members | |
+ * |_____________________| | | +------------+ |
+ * | | | | |
+ * | encoders info |<---+ | |
+ * |_____________________| | |
+ * | | ___| |
+ * |_____________________|____/ |
+ * | | |
+ * | Something | |
+ * |_____________________|_________________ |
+ * | | | |
+ * | EDID | |<--------------+
+ * |_____________________|_____________|___
+ * | |
+ * | | Contents of those device specific data
+ * | GPU specific info | block are implement-defined and version
+ * | | dependent :0
+ * |_____________________|
+ * / . /
+ * / . /
+ * / . /
+ * |_____________________| 0x040000
+ *
+ */
+
+enum loongson_vbios_dcb_type {
+ LV_DCB_HEADER = 0,
+ LV_DCB_CRTC = 1,
+ LV_DCB_ENCODER = 2,
+ LV_DCB_CONNECTOR = 3,
+ LV_DCB_I2C = 4,
+ LV_DCB_PWM = 5,
+ LV_DCB_GPIO = 6,
+ LV_DCB_BACKLIGHT = 7,
+ LV_DCB_FAN = 8,
+ LV_DCB_IRQ = 9,
+ LV_DCB_ENCODER_CFG = 10,
+ LV_DCB_ENCODER_RES = 11,
+ LV_DCB_GPU = 12,
+ LV_DCB_UNKNOWN = 13,
+ LV_DCB_END = 0xffff,
+};
+
+struct loongson_vbios_header {
+ char header[16];
+ u32 version_major;
+ u32 version_minor;
+ char information[20];
+ u32 num_crtc;
+ u32 crtc_offset;
+ u32 num_connector;
+ u32 connector_offset;
+ u32 num_encoder;
+ u32 encoder_offset;
+} __packed;
+
+struct loongson_vbios_encoder {
+ u32 feature;
+ u32 i2c_id;
+ u32 connector_id;
+ u32 type;
+ u32 config_method;
+ u32 chip_id;
+ u8 chip_addr;
+} __packed;
+
+struct loongson_vbios_connector {
+ u32 feature;
+ u32 i2c_id;
+ u8 edid[256];
+ u32 type;
+ u32 hotplug_method;
+ u32 edid_method;
+ u32 hpd_int_gpio;
+ u32 gpio_place;
+} __packed;
+
+/*
+ * A list node which contains the information about the device specific data
+ * block, the device here refer to the property or topology of hardware
+ * configuration, such as external display bridges, HDP GPIO, connectors etc.
+ */
+struct loongson_vbios_node {
+ struct list_head head;
+
+ /* @type: the type of the data. For search */
+ u32 type;
+ /* @id: the index(display pipe) of the data belong to. For search */
+ u32 id;
+ /*
+ * @data: point to the device specific data block, such as external
+ * encoders name and it's i2c device address, hpd gpio resource etc.
+ */
+ const void *data;
+ /*
+ * The size of the data.
+ */
+ u32 size;
+};
+
+/*
+ * The returned pointer is actually point to &__loongson_vbios, but this
+ * function is only intended to provide READ-ONLY access. As our vbios is
+ * only be able to pass(provide) parameters, it is not executable and outside
+ * should not modify it.
+ */
+const struct loongson_vbios *to_loongson_vbios(struct drm_device *ddev)
+{
+ struct lsdc_device *ldev = to_lsdc(ddev);
+ const struct loongson_gfx_desc *gfx = to_loongson_gfx(ldev->descp);
+
+ return gfx->vbios;
+}
+
+static bool loongson_vbios_is_valid(const struct loongson_vbios *vbios)
+{
+ char header[32];
+
+ memcpy(header, vbios->raw_data, sizeof(header));
+
+ if (strcmp(header, LOONGSON_VBIOS_HEADER_STR))
+ return false;
+
+ return true;
+}
+
+/*
+ * The VBIOS blob is stored at the last 1 MiB of the VRAM, no SPI flush or
+ * EEPROM is needed. Platform BIOS is responsible for store this VBIOS blob
+ * data at right position on per boot time.
+ */
+static int loongson_vbios_construct(struct drm_device *ddev,
+ struct loongson_vbios *vbios)
+{
+ struct lsdc_device *ldev = to_lsdc(ddev);
+ u64 vram_end = ldev->vram_base + ldev->vram_size;
+ u64 vbios_start = vram_end - LOONGSON_VBIOS_BLOCK_OFFSET;
+ void __iomem *ptr;
+
+ vbios->raw_data = kzalloc(LOONGSON_VBIOS_BLOCK_SIZE, GFP_KERNEL);
+ if (!vbios->raw_data)
+ return -ENOMEM;
+
+ ptr = ioremap(vbios_start, LOONGSON_VBIOS_BLOCK_SIZE);
+ if (!ptr) {
+ drm_err(ddev, "Map VBIOS region failed\n");
+ return -ENOMEM;
+ }
+
+ memcpy_fromio(vbios->raw_data, ptr, LOONGSON_VBIOS_BLOCK_SIZE);
+
+ iounmap(ptr);
+
+ INIT_LIST_HEAD(&vbios->list);
+ vbios->ddev = ddev;
+
+ return 0;
+}
+
+static void loongson_vbios_destruct(struct drm_device *ddev, void *data)
+{
+ struct loongson_vbios *vbios = (struct loongson_vbios *)data;
+ struct loongson_vbios_node *node;
+ struct loongson_vbios_node *tmp;
+
+ list_for_each_entry_safe(node, tmp, &vbios->list, head) {
+ list_del(&node->head);
+ kfree(node);
+ }
+
+ kfree(vbios->raw_data);
+ vbios->raw_data = NULL;
+}
+
+static void loongson_vbios_print_dcb(struct drm_device *ddev,
+ struct loongson_vbios_dcb *dcb)
+{
+ drm_info(ddev, "type: %u, Offset: %u, Size: %u, version: %u, ID: %u\n",
+ dcb->type, dcb->offset, dcb->size, dcb->version, dcb->id);
+}
+
+/*
+ * Process the data control block, establish a list for later searching.
+ * returns the number of data control block. Generally, loongson vbios
+ * has only 10 DCB or so.
+ */
+static int loongson_vbios_process_dcb(struct loongson_vbios *vbios,
+ bool verbose)
+{
+ struct drm_device *ddev = vbios->ddev;
+ void *base = vbios->raw_data;
+ int count = 0;
+ struct loongson_vbios_dcb *dcb;
+
+ dcb = (struct loongson_vbios_dcb *)(base + LOONGSON_VBIOS_DCB_OFFSET);
+
+ while (dcb->type != LV_DCB_END) {
+ struct loongson_vbios_node *node;
+
+ node = kzalloc(sizeof(*node), GFP_KERNEL);
+ if (!node)
+ return -ENOMEM;
+
+ node->type = dcb->type;
+ node->id = dcb->id;
+ node->data = base + dcb->offset;
+ node->size = dcb->size;
+
+ list_add_tail(&node->head, &vbios->list);
+
+ if (verbose)
+ loongson_vbios_print_dcb(ddev, dcb);
+
+ ++dcb;
+
+ if (++count > 1024) {
+ drm_err(ddev, "Unlikely, DCB is too much\n");
+ break;
+ }
+ }
+
+ return count;
+}
+
+static const struct loongson_vbios_node *
+loongson_vbios_get_node(struct drm_device *ddev, u32 type, u32 id)
+{
+ const struct loongson_vbios *vbios = to_loongson_vbios(ddev);
+ struct loongson_vbios_node *np;
+
+ if (!vbios)
+ return NULL;
+
+ list_for_each_entry(np, &vbios->list, head) {
+ if (np->type == type && np->id == id)
+ return np;
+ }
+
+ return NULL;
+}
+
+bool loongson_vbios_query_encoder_info(struct drm_device *ddev,
+ u32 pipe,
+ u32 *type,
+ enum loongson_vbios_encoder_name *name,
+ u8 *i2c_addr)
+{
+ const struct loongson_vbios_encoder *vencoder;
+ const struct loongson_vbios_node *np;
+
+ np = loongson_vbios_get_node(ddev, LV_DCB_ENCODER, pipe);
+ if (!np)
+ return false;
+
+ if (np->size != sizeof(*vencoder))
+ WARN_ON(1);
+
+ vencoder = (const struct loongson_vbios_encoder *)np->data;
+
+ if (type)
+ *type = vencoder->type;
+
+ if (name)
+ *name = vencoder->chip_id;
+
+ /* i2c address, as a slave device */
+ if (i2c_addr)
+ *i2c_addr = vencoder->chip_addr;
+
+ return true;
+}
+
+bool loongson_vbios_query_connector_info(struct drm_device *ddev,
+ u32 pipe,
+ u32 *connector_type,
+ u32 *hpd_method,
+ u32 *int_gpio,
+ u8 *edid_blob)
+{
+ const struct loongson_vbios_connector *vconnector;
+ const struct loongson_vbios_node *np;
+
+ np = loongson_vbios_get_node(ddev, LV_DCB_CONNECTOR, pipe);
+ if (!np)
+ return false;
+
+ if (np->size != sizeof(*vconnector))
+ WARN_ON(1);
+
+ vconnector = (const struct loongson_vbios_connector *)np->data;
+
+ if (connector_type)
+ *connector_type = vconnector->type;
+
+ if (edid_blob)
+ memcpy(edid_blob, vconnector->edid, 256);
+
+ if (int_gpio)
+ *int_gpio = vconnector->hpd_int_gpio;
+
+ return true;
+}
+
+static void loongson_vbios_acquire_version(struct drm_device *ddev,
+ struct loongson_vbios *vbios)
+{
+ struct loongson_vbios_header *vh;
+
+ vh = (struct loongson_vbios_header *)vbios->raw_data;
+
+ vbios->version_major = vh->version_major;
+ vbios->version_minor = vh->version_minor;
+
+ drm_info(ddev, "Loongson VBIOS version: %u.%u\n",
+ vh->version_major, vh->version_minor);
+}
+
+int loongson_vbios_init(struct drm_device *ddev)
+{
+ struct loongson_vbios *vbios = &__loongson_vbios;
+ int ret;
+ int num;
+
+ ret = loongson_vbios_construct(ddev, vbios);
+ if (ret)
+ return ret;
+
+ ret = drmm_add_action_or_reset(ddev, loongson_vbios_destruct, vbios);
+ if (ret)
+ return ret;
+
+ if (!loongson_vbios_is_valid(vbios)) {
+ drm_err(ddev, "Loongson VBIOS: header is invalid\n");
+ return -EINVAL;
+ }
+
+ loongson_vbios_acquire_version(ddev, vbios);
+
+ num = loongson_vbios_process_dcb(vbios, false);
+ if (num <= 0) {
+ drm_err(ddev, "Loongson VBIOS: Process DCB failed\n");
+ return -EINVAL;
+ }
+
+ drm_info(ddev, "Loongson VBIOS: has %d DCBs\n", num);
+
+ return 0;
+}
diff --git a/drivers/gpu/drm/loongson/loongson_vbios.h b/drivers/gpu/drm/loongson/loongson_vbios.h
new file mode 100644
index 000000000000..66fb43b3609e
--- /dev/null
+++ b/drivers/gpu/drm/loongson/loongson_vbios.h
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2023 Loongson Technology Corporation Limited
+ */
+
+#ifndef __LOONGSON_VBIOS_H__
+#define __LOONGSON_VBIOS_H__
+
+#include <drm/drm_device.h>
+
+struct loongson_vbios {
+ struct list_head list;
+ void *raw_data;
+ struct drm_device *ddev;
+ u32 version_major;
+ u32 version_minor;
+};
+
+enum loongson_vbios_encoder_name {
+ ENCODER_CHIP_UNKNOWN = 0x00,
+ ENCODER_CHIP_INTERNAL_VGA = 0x01,
+ ENCODER_CHIP_INTERNAL_HDMI = 0x02,
+ ENCODER_CHIP_CH7055 = 0x10,
+ ENCODER_CHIP_ADV7125 = 0x11,
+ ENCODER_CHIP_TFP410 = 0x20,
+ ENCODER_CHIP_IT66121 = 0x30,
+ ENCODER_CHIP_SIL9022 = 0x31,
+ ENCODER_CHIP_LT8618 = 0x32,
+ ENCODER_CHIP_MS7210 = 0x33,
+ ENCODER_CHIP_NCS8805 = 0x40,
+ ENCODER_CHIP_LT9721 = 0x42,
+ ENCODER_CHIP_LT6711 = 0x43,
+ ENCODER_CHIP_LT8619 = 0x50,
+};
+
+enum loongson_vbios_hotplug_method {
+ LV_HPD_DISABLED = 0,
+ LV_HPD_POLLING = 1,
+ LV_HPD_IRQ = 2,
+};
+
+const struct loongson_vbios *to_loongson_vbios(struct drm_device *ddev);
+
+bool loongson_vbios_query_encoder_info(struct drm_device *ddev,
+ u32 pipe,
+ u32 *type,
+ enum loongson_vbios_encoder_name *name,
+ u8 *i2c_addr);
+
+bool loongson_vbios_query_connector_info(struct drm_device *ddev,
+ u32 pipe,
+ u32 *connector_type,
+ u32 *hpd_method,
+ u32 *int_gpio,
+ u8 *edid_blob);
+
+int loongson_vbios_init(struct drm_device *ddev);
+
+#endif
diff --git a/drivers/gpu/drm/loongson/lsdc_drv.c b/drivers/gpu/drm/loongson/lsdc_drv.c
index 89ccc0c43169..aebb200fa567 100644
--- a/drivers/gpu/drm/loongson/lsdc_drv.c
+++ b/drivers/gpu/drm/loongson/lsdc_drv.c
@@ -213,6 +213,10 @@ lsdc_create_device(struct pci_dev *pdev,
return ERR_PTR(ret);
}
+ ret = loongson_vbios_init(ddev);
+ if (ret)
+ drm_info(ddev, "No VBIOS support\n");
+
ret = drm_aperture_remove_conflicting_framebuffers(ldev->vram_base,
ldev->vram_size,
driver);
diff --git a/drivers/gpu/drm/loongson/lsdc_drv.h b/drivers/gpu/drm/loongson/lsdc_drv.h
index fbf2d760ef27..335953c988d1 100644
--- a/drivers/gpu/drm/loongson/lsdc_drv.h
+++ b/drivers/gpu/drm/loongson/lsdc_drv.h
@@ -16,6 +16,7 @@
#include <drm/drm_plane.h>
#include <drm/ttm/ttm_device.h>
+#include "loongson_vbios.h"
#include "lsdc_i2c.h"
#include "lsdc_irq.h"
#include "lsdc_gfxpll.h"
@@ -85,6 +86,13 @@ struct loongson_gfx_desc {
u32 reg_size;
} pixpll[LSDC_NUM_CRTC];
+ /*
+ * @vbios: Provide information about the output configuration,
+ * and provide information about dynamic features which cannot
+ * be detected(determined) with the chip_id.
+ */
+ const struct loongson_vbios *vbios;
+
enum loongson_chip_id chip_id;
char model[64];
};
--
2.34.1