--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * FB driver for the WiseChip Semiconductor Inc. (UG-6028GDEBF02) display
+ * using the SEPS525 (Syncoam) LCD Controller
+ *
+ * Copyright (C) 2020 Xilinx Inc.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <cpu_func.h>
+#include <dm.h>
+#include <errno.h>
+#include <spi.h>
+#include <video.h>
+#include <asm/gpio.h>
+#include <dm/device_compat.h>
+#include <linux/delay.h>
+
+#define WIDTH 160
+#define HEIGHT 128
+
+#define SEPS525_INDEX 0x00
+#define SEPS525_STATUS_RD 0x01
+#define SEPS525_OSC_CTL 0x02
+#define SEPS525_IREF 0x80
+#define SEPS525_CLOCK_DIV 0x03
+#define SEPS525_REDUCE_CURRENT 0x04
+#define SEPS525_SOFT_RST 0x05
+#define SEPS525_DISP_ONOFF 0x06
+#define SEPS525_PRECHARGE_TIME_R 0x08
+#define SEPS525_PRECHARGE_TIME_G 0x09
+#define SEPS525_PRECHARGE_TIME_B 0x0A
+#define SEPS525_PRECHARGE_CURRENT_R 0x0B
+#define SEPS525_PRECHARGE_CURRENT_G 0x0C
+#define SEPS525_PRECHARGE_CURRENT_B 0x0D
+#define SEPS525_DRIVING_CURRENT_R 0x10
+#define SEPS525_DRIVING_CURRENT_G 0x11
+#define SEPS525_DRIVING_CURRENT_B 0x12
+#define SEPS525_DISPLAYMODE_SET 0x13
+#define SEPS525_RGBIF 0x14
+#define SEPS525_RGB_POL 0x15
+#define SEPS525_MEMORY_WRITEMODE 0x16
+#define SEPS525_MX1_ADDR 0x17
+#define SEPS525_MX2_ADDR 0x18
+#define SEPS525_MY1_ADDR 0x19
+#define SEPS525_MY2_ADDR 0x1A
+#define SEPS525_MEMORY_ACCESS_POINTER_X 0x20
+#define SEPS525_MEMORY_ACCESS_POINTER_Y 0x21
+#define SEPS525_DDRAM_DATA_ACCESS_PORT 0x22
+#define SEPS525_GRAY_SCALE_TABLE_INDEX 0x50
+#define SEPS525_GRAY_SCALE_TABLE_DATA 0x51
+#define SEPS525_DUTY 0x28
+#define SEPS525_DSL 0x29
+#define SEPS525_D1_DDRAM_FAC 0x2E
+#define SEPS525_D1_DDRAM_FAR 0x2F
+#define SEPS525_D2_DDRAM_SAC 0x31
+#define SEPS525_D2_DDRAM_SAR 0x32
+#define SEPS525_SCR1_FX1 0x33
+#define SEPS525_SCR1_FX2 0x34
+#define SEPS525_SCR1_FY1 0x35
+#define SEPS525_SCR1_FY2 0x36
+#define SEPS525_SCR2_SX1 0x37
+#define SEPS525_SCR2_SX2 0x38
+#define SEPS525_SCR2_SY1 0x39
+#define SEPS525_SCR2_SY2 0x3A
+#define SEPS525_SCREEN_SAVER_CONTEROL 0x3B
+#define SEPS525_SS_SLEEP_TIMER 0x3C
+#define SEPS525_SCREEN_SAVER_MODE 0x3D
+#define SEPS525_SS_SCR1_FU 0x3E
+#define SEPS525_SS_SCR1_MXY 0x3F
+#define SEPS525_SS_SCR2_FU 0x40
+#define SEPS525_SS_SCR2_MXY 0x41
+#define SEPS525_MOVING_DIRECTION 0x42
+#define SEPS525_SS_SCR2_SX1 0x47
+#define SEPS525_SS_SCR2_SX2 0x48
+#define SEPS525_SS_SCR2_SY1 0x49
+#define SEPS525_SS_SCR2_SY2 0x4A
+
+/* SEPS525_DISPLAYMODE_SET */
+#define MODE_SWAP_BGR BIT(7)
+#define MODE_SM BIT(6)
+#define MODE_RD BIT(5)
+#define MODE_CD BIT(4)
+
+/**
+ * struct seps525_priv - Private structure
+ * @reset_gpio: Reset gpio pin
+ * @dc_gpio: Data/command control gpio pin
+ * @dev: Device uclass for video_ops
+ */
+struct seps525_priv {
+ struct gpio_desc reset_gpio;
+ struct gpio_desc dc_gpio;
+ struct udevice *dev;
+};
+
+static int seps525_spi_write_cmd(struct udevice *dev, u32 reg)
+{
+ struct seps525_priv *priv = dev_get_priv(dev);
+ u8 buf8 = reg;
+ int ret;
+
+ ret = dm_gpio_set_value(&priv->dc_gpio, 0);
+ if (ret) {
+ dev_dbg(dev, "Failed to handle dc\n");
+ return ret;
+ }
+
+ ret = dm_spi_xfer(dev, 8, &buf8, NULL, SPI_XFER_BEGIN | SPI_XFER_END);
+ if (ret)
+ dev_dbg(dev, "Failed to write command\n");
+
+ return ret;
+}
+
+static int seps525_spi_write_data(struct udevice *dev, u32 val)
+{
+ struct seps525_priv *priv = dev_get_priv(dev);
+ u8 buf8 = val;
+ int ret;
+
+ ret = dm_gpio_set_value(&priv->dc_gpio, 1);
+ if (ret) {
+ dev_dbg(dev, "Failed to handle dc\n");
+ return ret;
+ }
+
+ ret = dm_spi_xfer(dev, 8, &buf8, NULL, SPI_XFER_BEGIN | SPI_XFER_END);
+ if (ret)
+ dev_dbg(dev, "Failed to write data\n");
+
+ return ret;
+}
+
+static void seps525_spi_write(struct udevice *dev, u32 reg, u32 val)
+{
+ (void)seps525_spi_write_cmd(dev, reg);
+ (void)seps525_spi_write_data(dev, val);
+}
+
+static int seps525_display_init(struct udevice *dev)
+{
+ /* Disable Oscillator Power Down */
+ seps525_spi_write(dev, SEPS525_REDUCE_CURRENT, 0x03);
+ mdelay(5);
+
+ /* Set Normal Driving Current */
+ seps525_spi_write(dev, SEPS525_REDUCE_CURRENT, 0x00);
+ mdelay(5);
+
+ seps525_spi_write(dev, SEPS525_SCREEN_SAVER_CONTEROL, 0x00);
+ /* Set EXPORT1 Pin at Internal Clock */
+ seps525_spi_write(dev, SEPS525_OSC_CTL, 0x01);
+ /* Set Clock as 120 Frames/Sec */
+ seps525_spi_write(dev, SEPS525_CLOCK_DIV, 0x90);
+ /* Set Reference Voltage Controlled by External Resister */
+ seps525_spi_write(dev, SEPS525_IREF, 0x01);
+
+ /* precharge time R G B */
+ seps525_spi_write(dev, SEPS525_PRECHARGE_TIME_R, 0x04);
+ seps525_spi_write(dev, SEPS525_PRECHARGE_TIME_G, 0x05);
+ seps525_spi_write(dev, SEPS525_PRECHARGE_TIME_B, 0x05);
+
+ /* precharge current R G B (uA) */
+ seps525_spi_write(dev, SEPS525_PRECHARGE_CURRENT_R, 0x9D);
+ seps525_spi_write(dev, SEPS525_PRECHARGE_CURRENT_G, 0x8C);
+ seps525_spi_write(dev, SEPS525_PRECHARGE_CURRENT_B, 0x57);
+
+ /* driving current R G B (uA) */
+ seps525_spi_write(dev, SEPS525_DRIVING_CURRENT_R, 0x56);
+ seps525_spi_write(dev, SEPS525_DRIVING_CURRENT_G, 0x4D);
+ seps525_spi_write(dev, SEPS525_DRIVING_CURRENT_B, 0x46);
+ /* Set Color Sequence */
+ seps525_spi_write(dev, SEPS525_DISPLAYMODE_SET, 0x00);
+ /* Set MCU Interface Mode */
+ seps525_spi_write(dev, SEPS525_RGBIF, 0x01);
+ /* Set Memory Write Mode */
+ seps525_spi_write(dev, SEPS525_MEMORY_WRITEMODE, 0x66);
+ /* 1/128 Duty (0x0F~0x7F) */
+ seps525_spi_write(dev, SEPS525_DUTY, 0x7F);
+ /* Set Mapping RAM Display Start Line (0x00~0x7F) */
+ seps525_spi_write(dev, SEPS525_DSL, 0x00);
+ /* Display On (0x00/0x01) */
+ seps525_spi_write(dev, SEPS525_DISP_ONOFF, 0x01);
+ /* Set All Internal Register Value as Normal Mode */
+ seps525_spi_write(dev, SEPS525_SOFT_RST, 0x00);
+ /* Set RGB Interface Polarity as Active Low */
+ seps525_spi_write(dev, SEPS525_RGB_POL, 0x00);
+
+ /* Enable access for data */
+ (void)seps525_spi_write_cmd(dev, SEPS525_DDRAM_DATA_ACCESS_PORT);
+
+ return 0;
+}
+
+static int seps525_spi_startup(struct udevice *dev)
+{
+ struct seps525_priv *priv = dev_get_priv(dev);
+ int ret;
+
+ ret = dm_gpio_set_value(&priv->reset_gpio, 1);
+ if (ret)
+ return ret;
+
+ ret = dm_gpio_set_value(&priv->reset_gpio, 0);
+ if (ret)
+ return ret;
+
+ ret = dm_spi_claim_bus(dev);
+ if (ret) {
+ dev_err(dev, "Failed to claim SPI bus: %d\n", ret);
+ return ret;
+ }
+
+ ret = seps525_display_init(dev);
+ if (ret)
+ return ret;
+
+ dm_spi_release_bus(dev);
+
+ return 0;
+}
+
+static int seps525_sync(struct udevice *vid)
+{
+ struct video_priv *uc_priv = dev_get_uclass_priv(vid);
+ struct seps525_priv *priv = dev_get_priv(vid);
+ struct udevice *dev = priv->dev;
+ int i, ret;
+ u8 data1, data2;
+ u8 *start = uc_priv->fb;
+
+ ret = dm_spi_claim_bus(dev);
+ if (ret) {
+ dev_err(dev, "Failed to claim SPI bus: %d\n", ret);
+ return ret;
+ }
+
+ /* start position X,Y */
+ seps525_spi_write(dev, SEPS525_MEMORY_ACCESS_POINTER_X, 0);
+ seps525_spi_write(dev, SEPS525_MEMORY_ACCESS_POINTER_Y, 0);
+
+ /* Enable access for data */
+ (void)seps525_spi_write_cmd(dev, SEPS525_DDRAM_DATA_ACCESS_PORT);
+
+ for (i = 0; i < (uc_priv->xsize * uc_priv->ysize); i++) {
+ data2 = *start++;
+ data1 = *start++;
+ (void)seps525_spi_write_data(dev, data1);
+ (void)seps525_spi_write_data(dev, data2);
+ }
+
+ dm_spi_release_bus(dev);
+
+ return 0;
+}
+
+static int seps525_probe(struct udevice *dev)
+{
+ struct video_priv *uc_priv = dev_get_uclass_priv(dev);
+ struct seps525_priv *priv = dev_get_priv(dev);
+ u32 buswidth;
+ int ret;
+
+ buswidth = dev_read_u32_default(dev, "buswidth", 0);
+ if (buswidth != 8) {
+ dev_err(dev, "Only 8bit buswidth is supported now");
+ return -EINVAL;
+ }
+
+ ret = gpio_request_by_name(dev, "reset-gpios", 0,
+ &priv->reset_gpio, GPIOD_IS_OUT);
+ if (ret) {
+ dev_err(dev, "missing reset GPIO\n");
+ return ret;
+ }
+
+ ret = gpio_request_by_name(dev, "dc-gpios", 0,
+ &priv->dc_gpio, GPIOD_IS_OUT);
+ if (ret) {
+ dev_err(dev, "missing dc GPIO\n");
+ return ret;
+ }
+
+ uc_priv->bpix = VIDEO_BPP16;
+ uc_priv->xsize = WIDTH;
+ uc_priv->ysize = HEIGHT;
+ uc_priv->rot = 0;
+
+ priv->dev = dev;
+
+ ret = seps525_spi_startup(dev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int seps525_bind(struct udevice *dev)
+{
+ struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
+
+ plat->size = WIDTH * HEIGHT * 16;
+
+ return 0;
+}
+
+static const struct video_ops seps525_ops = {
+ .video_sync = seps525_sync,
+};
+
+static const struct udevice_id seps525_ids[] = {
+ { .compatible = "syncoam,seps525" },
+ { }
+};
+
+U_BOOT_DRIVER(seps525_video) = {
+ .name = "seps525_video",
+ .id = UCLASS_VIDEO,
+ .of_match = seps525_ids,
+ .ops = &seps525_ops,
+ .platdata_auto_alloc_size = sizeof(struct video_uc_platdata),
+ .bind = seps525_bind,
+ .probe = seps525_probe,
+ .priv_auto_alloc_size = sizeof(struct seps525_priv),
+};
projects / u-boot.git / commitdiff