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path: root/drivers/staging/fbtft/fb_ra8875.c
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Diffstat (limited to 'drivers/staging/fbtft/fb_ra8875.c')
-rw-r--r--drivers/staging/fbtft/fb_ra8875.c331
1 files changed, 331 insertions, 0 deletions
diff --git a/drivers/staging/fbtft/fb_ra8875.c b/drivers/staging/fbtft/fb_ra8875.c
new file mode 100644
index 000000000000..c323c06344fd
--- /dev/null
+++ b/drivers/staging/fbtft/fb_ra8875.c
@@ -0,0 +1,331 @@
+/******************************************************************************
+
+ ProjectName: FBTFT driver ***** *****
+ for the RA8875 LCD Controller * * ************
+ * ** ** * *
+ Copyright © by Pf@nne & NOTRO * * * * * **** *
+ * * * * * * *
+ Last modification by: * * * * **** *
+ - Pf@nne (pf@nne-mail.de) * * ***** *
+ * * * *******
+ ***** * *
+ Date : 10.06.2014 * *
+ Version : V1.13 *****
+ Revison : 5
+
+*******************************************************************************
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+
+#include <linux/gpio.h>
+#include "fbtft.h"
+
+#define DRVNAME "fb_ra8875"
+
+static int write_spi(struct fbtft_par *par, void *buf, size_t len)
+{
+ struct spi_transfer t = {
+ .tx_buf = buf,
+ .len = len,
+ .speed_hz = 1000000,
+ };
+ struct spi_message m;
+
+ fbtft_par_dbg_hex(DEBUG_WRITE, par, par->info->device, u8, buf, len,
+ "%s(len=%d): ", __func__, len);
+
+ if (!par->spi) {
+ dev_err(par->info->device,
+ "%s: par->spi is unexpectedly NULL\n", __func__);
+ return -1;
+ }
+
+ spi_message_init(&m);
+ if (par->txbuf.dma && buf == par->txbuf.buf) {
+ t.tx_dma = par->txbuf.dma;
+ m.is_dma_mapped = 1;
+ }
+ spi_message_add_tail(&t, &m);
+ return spi_sync(par->spi, &m);
+}
+
+static int init_display(struct fbtft_par *par)
+{
+ gpio_set_value(par->gpio.dc, 1);
+
+ fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
+ "%s()\n", __func__);
+ fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
+ "display size %dx%d\n", par->info->var.xres, par->info->var.yres);
+
+ par->fbtftops.reset(par);
+
+ if ((par->info->var.xres == 320) && (par->info->var.yres == 240)) {
+ /* PLL clock frequency */
+ write_reg(par, 0x88 , 0x0A);
+ write_reg(par, 0x89 , 0x02);
+ mdelay(10);
+ /* color deep / MCU Interface */
+ write_reg(par, 0x10 , 0x0C);
+ /* pixel clock period */
+ write_reg(par, 0x04 , 0x03);
+ mdelay(1);
+ /* horizontal settings */
+ write_reg(par, 0x14 , 0x27);
+ write_reg(par, 0x15 , 0x00);
+ write_reg(par, 0x16 , 0x05);
+ write_reg(par, 0x17 , 0x04);
+ write_reg(par, 0x18 , 0x03);
+ /* vertical settings */
+ write_reg(par, 0x19 , 0xEF);
+ write_reg(par, 0x1A , 0x00);
+ write_reg(par, 0x1B , 0x05);
+ write_reg(par, 0x1C , 0x00);
+ write_reg(par, 0x1D , 0x0E);
+ write_reg(par, 0x1E , 0x00);
+ write_reg(par, 0x1F , 0x02);
+ } else if ((par->info->var.xres == 480) && (par->info->var.yres == 272)) {
+ /* PLL clock frequency */
+ write_reg(par, 0x88 , 0x0A);
+ write_reg(par, 0x89 , 0x02);
+ mdelay(10);
+ /* color deep / MCU Interface */
+ write_reg(par, 0x10 , 0x0C);
+ /* pixel clock period */
+ write_reg(par, 0x04 , 0x82);
+ mdelay(1);
+ /* horizontal settings */
+ write_reg(par, 0x14 , 0x3B);
+ write_reg(par, 0x15 , 0x00);
+ write_reg(par, 0x16 , 0x01);
+ write_reg(par, 0x17 , 0x00);
+ write_reg(par, 0x18 , 0x05);
+ /* vertical settings */
+ write_reg(par, 0x19 , 0x0F);
+ write_reg(par, 0x1A , 0x01);
+ write_reg(par, 0x1B , 0x02);
+ write_reg(par, 0x1C , 0x00);
+ write_reg(par, 0x1D , 0x07);
+ write_reg(par, 0x1E , 0x00);
+ write_reg(par, 0x1F , 0x09);
+ } else if ((par->info->var.xres == 640) && (par->info->var.yres == 480)) {
+ /* PLL clock frequency */
+ write_reg(par, 0x88 , 0x0B);
+ write_reg(par, 0x89 , 0x02);
+ mdelay(10);
+ /* color deep / MCU Interface */
+ write_reg(par, 0x10 , 0x0C);
+ /* pixel clock period */
+ write_reg(par, 0x04 , 0x01);
+ mdelay(1);
+ /* horizontal settings */
+ write_reg(par, 0x14 , 0x4F);
+ write_reg(par, 0x15 , 0x05);
+ write_reg(par, 0x16 , 0x0F);
+ write_reg(par, 0x17 , 0x01);
+ write_reg(par, 0x18 , 0x00);
+ /* vertical settings */
+ write_reg(par, 0x19 , 0xDF);
+ write_reg(par, 0x1A , 0x01);
+ write_reg(par, 0x1B , 0x0A);
+ write_reg(par, 0x1C , 0x00);
+ write_reg(par, 0x1D , 0x0E);
+ write_reg(par, 0x1E , 0x00);
+ write_reg(par, 0x1F , 0x01);
+ } else if ((par->info->var.xres == 800) && (par->info->var.yres == 480)) {
+ /* PLL clock frequency */
+ write_reg(par, 0x88 , 0x0B);
+ write_reg(par, 0x89 , 0x02);
+ mdelay(10);
+ /* color deep / MCU Interface */
+ write_reg(par, 0x10 , 0x0C);
+ /* pixel clock period */
+ write_reg(par, 0x04 , 0x81);
+ mdelay(1);
+ /* horizontal settings */
+ write_reg(par, 0x14 , 0x63);
+ write_reg(par, 0x15 , 0x03);
+ write_reg(par, 0x16 , 0x03);
+ write_reg(par, 0x17 , 0x02);
+ write_reg(par, 0x18 , 0x00);
+ /* vertical settings */
+ write_reg(par, 0x19 , 0xDF);
+ write_reg(par, 0x1A , 0x01);
+ write_reg(par, 0x1B , 0x14);
+ write_reg(par, 0x1C , 0x00);
+ write_reg(par, 0x1D , 0x06);
+ write_reg(par, 0x1E , 0x00);
+ write_reg(par, 0x1F , 0x01);
+ } else {
+ dev_err(par->info->device, "display size is not supported!!");
+ return -1;
+ }
+
+ /* PWM clock */
+ write_reg(par, 0x8a , 0x81);
+ write_reg(par, 0x8b , 0xFF);
+ mdelay(10);
+
+ /* Display ON */
+ write_reg(par, 0x01 , 0x80);
+ mdelay(10);
+
+ return 0;
+}
+
+static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
+{
+ fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par,
+ "%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye);
+
+ /* Set_Active_Window */
+ write_reg(par, 0x30 , xs & 0x00FF);
+ write_reg(par, 0x31 , (xs & 0xFF00) >> 8);
+ write_reg(par, 0x32 , ys & 0x00FF);
+ write_reg(par, 0x33 , (ys & 0xFF00) >> 8);
+ write_reg(par, 0x34 , (xs+xe) & 0x00FF);
+ write_reg(par, 0x35 , ((xs+xe) & 0xFF00) >> 8);
+ write_reg(par, 0x36 , (ys+ye) & 0x00FF);
+ write_reg(par, 0x37 , ((ys+ye) & 0xFF00) >> 8);
+
+ /* Set_Memory_Write_Cursor */
+ write_reg(par, 0x46, xs & 0xff);
+ write_reg(par, 0x47, (xs >> 8) & 0x03);
+ write_reg(par, 0x48, ys & 0xff);
+ write_reg(par, 0x49, (ys >> 8) & 0x01);
+
+ write_reg(par, 0x02);
+}
+
+static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
+{
+ va_list args;
+ int i, ret;
+ u8 *buf = (u8 *)par->buf;
+
+ /* slow down spi-speed for writing registers */
+ par->fbtftops.write = write_spi;
+
+ if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) {
+ va_start(args, len);
+ for (i = 0; i < len; i++)
+ buf[i] = (u8)va_arg(args, unsigned int);
+ va_end(args);
+ fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par, par->info->device,
+ u8, buf, len, "%s: ", __func__);
+ }
+
+ va_start(args, len);
+ *buf++ = 0x80;
+ *buf = (u8)va_arg(args, unsigned int);
+ ret = par->fbtftops.write(par, par->buf, 2);
+ if (ret < 0) {
+ va_end(args);
+ dev_err(par->info->device, "%s: write() failed and returned %dn",
+ __func__, ret);
+ return;
+ }
+ len--;
+
+ udelay(100);
+
+ if (len) {
+ buf = (u8 *)par->buf;
+ *buf++ = 0x00;
+ i = len;
+ while (i--)
+ *buf++ = (u8)va_arg(args, unsigned int);
+
+ ret = par->fbtftops.write(par, par->buf, len + 1);
+ if (ret < 0) {
+ va_end(args);
+ dev_err(par->info->device, "%s: write() failed and returned %dn",
+ __func__, ret);
+ return;
+ }
+ }
+ va_end(args);
+
+ /* restore user spi-speed */
+ par->fbtftops.write = fbtft_write_spi;
+ udelay(100);
+}
+
+static int write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len)
+{
+ u16 *vmem16;
+ u16 *txbuf16 = (u16 *)par->txbuf.buf;
+ size_t remain;
+ size_t to_copy;
+ size_t tx_array_size;
+ int i;
+ int ret = 0;
+ size_t startbyte_size = 0;
+
+ fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s(offset=%zu, len=%zu)\n",
+ __func__, offset, len);
+
+ remain = len / 2;
+ vmem16 = (u16 *)(par->info->screen_base + offset);
+ tx_array_size = par->txbuf.len / 2;
+ txbuf16 = (u16 *)(par->txbuf.buf + 1);
+ tx_array_size -= 2;
+ *(u8 *)(par->txbuf.buf) = 0x00;
+ startbyte_size = 1;
+
+ while (remain) {
+ to_copy = remain > tx_array_size ? tx_array_size : remain;
+ dev_dbg(par->info->device, " to_copy=%zu, remain=%zu\n",
+ to_copy, remain - to_copy);
+
+ for (i = 0; i < to_copy; i++)
+ txbuf16[i] = cpu_to_be16(vmem16[i]);
+
+ vmem16 = vmem16 + to_copy;
+ ret = par->fbtftops.write(par, par->txbuf.buf,
+ startbyte_size + to_copy * 2);
+ if (ret < 0)
+ return ret;
+ remain -= to_copy;
+ }
+
+ return ret;
+}
+
+static struct fbtft_display display = {
+ .regwidth = 8,
+ .fbtftops = {
+ .init_display = init_display,
+ .set_addr_win = set_addr_win,
+ .write_register = write_reg8_bus8,
+ .write_vmem = write_vmem16_bus8,
+ .write = write_spi,
+ },
+};
+FBTFT_REGISTER_DRIVER(DRVNAME, "raio,ra8875", &display);
+
+MODULE_ALIAS("spi:" DRVNAME);
+MODULE_ALIAS("platform:" DRVNAME);
+MODULE_ALIAS("spi:ra8875");
+MODULE_ALIAS("platform:ra8875");
+
+MODULE_DESCRIPTION("FB driver for the RA8875 LCD Controller");
+MODULE_AUTHOR("Pf@nne");
+MODULE_LICENSE("GPL");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.