| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * FBTFT driver for the RA8875 LCD Controller |
| * Copyright by Pf@nne & NOTRO |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/delay.h> |
| |
| #include <linux/gpio/consumer.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=%zu): ", __func__, len); |
| |
| if (!par->spi) { |
| dev_err(par->info->device, |
| "%s: par->spi is unexpectedly NULL\n", __func__); |
| return -1; |
| } |
| |
| spi_message_init(&m); |
| spi_message_add_tail(&t, &m); |
| return spi_sync(par->spi, &m); |
| } |
| |
| static int init_display(struct fbtft_par *par) |
| { |
| gpiod_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) |
| { |
| /* 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 = 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, "write() failed and returned %dn", |
| 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, |
| "write() failed and returned %dn", 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; |
| __be16 *txbuf16; |
| 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_buffer + offset); |
| tx_array_size = par->txbuf.len / 2; |
| txbuf16 = par->txbuf.buf + 1; |
| tx_array_size -= 2; |
| *(u8 *)(par->txbuf.buf) = 0x00; |
| startbyte_size = 1; |
| |
| while (remain) { |
| to_copy = min(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"); |