--- /dev/null
+/*
+ * FB driver for the ILI9325 LCD Controller
+ *
+ * Copyright (C) 2013 Noralf Tronnes
+ *
+ * Based on ili9325.c by Jeroen Domburg
+ *
+ * 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/gpio.h>
+#include <linux/delay.h>
+
+#include "fbtft.h"
+
+#define DRVNAME "fb_ili9325"
+#define WIDTH 240
+#define HEIGHT 320
+#define BPP 16
+#define FPS 20
+#define DEFAULT_GAMMA "0F 00 7 2 0 0 6 5 4 1\n" \
+ "04 16 2 7 6 3 2 1 7 7"
+
+
+static unsigned bt = 6; /* VGL=Vci*4 , VGH=Vci*4 */
+module_param(bt, uint, 0);
+MODULE_PARM_DESC(bt, "Sets the factor used in the step-up circuits");
+
+static unsigned vc = 0b011; /* Vci1=Vci*0.80 */
+module_param(vc, uint, 0);
+MODULE_PARM_DESC(vc,
+"Sets the ratio factor of Vci to generate the reference voltages Vci1");
+
+static unsigned vrh = 0b1101; /* VREG1OUT=Vci*1.85 */
+module_param(vrh, uint, 0);
+MODULE_PARM_DESC(vrh,
+"Set the amplifying rate (1.6 ~ 1.9) of Vci applied to output the VREG1OUT");
+
+static unsigned vdv = 0b10010; /* VCOMH amplitude=VREG1OUT*0.98 */
+module_param(vdv, uint, 0);
+MODULE_PARM_DESC(vdv,
+"Select the factor of VREG1OUT to set the amplitude of Vcom");
+
+static unsigned vcm = 0b001010; /* VCOMH=VREG1OUT*0.735 */
+module_param(vcm, uint, 0);
+MODULE_PARM_DESC(vcm, "Set the internal VcomH voltage");
+
+
+/*
+Verify that this configuration is within the Voltage limits
+
+Display module configuration: Vcc = IOVcc = Vci = 3.3V
+
+ Voltages
+----------
+Vci = 3.3
+Vci1 = Vci * 0.80 = 2.64
+DDVDH = Vci1 * 2 = 5.28
+VCL = -Vci1 = -2.64
+VREG1OUT = Vci * 1.85 = 4.88
+VCOMH = VREG1OUT * 0.735 = 3.59
+VCOM amplitude = VREG1OUT * 0.98 = 4.79
+VGH = Vci * 4 = 13.2
+VGL = -Vci * 4 = -13.2
+
+ Limits
+--------
+Power supplies
+1.65 < IOVcc < 3.30 => 1.65 < 3.3 < 3.30
+2.40 < Vcc < 3.30 => 2.40 < 3.3 < 3.30
+2.50 < Vci < 3.30 => 2.50 < 3.3 < 3.30
+
+Source/VCOM power supply voltage
+ 4.50 < DDVDH < 6.0 => 4.50 < 5.28 < 6.0
+-3.0 < VCL < -2.0 => -3.0 < -2.64 < -2.0
+VCI - VCL < 6.0 => 5.94 < 6.0
+
+Gate driver output voltage
+ 10 < VGH < 20 => 10 < 13.2 < 20
+-15 < VGL < -5 => -15 < -13.2 < -5
+VGH - VGL < 32 => 26.4 < 32
+
+VCOM driver output voltage
+VCOMH - VCOML < 6.0 => 4.79 < 6.0
+*/
+
+static int init_display(struct fbtft_par *par)
+{
+ fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+ par->fbtftops.reset(par);
+
+ if (par->gpio.cs != -1)
+ gpio_set_value(par->gpio.cs, 0); /* Activate chip */
+
+ bt &= 0b111;
+ vc &= 0b111;
+ vrh &= 0b1111;
+ vdv &= 0b11111;
+ vcm &= 0b111111;
+
+ /* Initialization sequence from ILI9325 Application Notes */
+
+ /* ----------- Start Initial Sequence ----------- */
+ write_reg(par, 0x00E3, 0x3008); /* Set internal timing */
+ write_reg(par, 0x00E7, 0x0012); /* Set internal timing */
+ write_reg(par, 0x00EF, 0x1231); /* Set internal timing */
+ write_reg(par, 0x0001, 0x0100); /* set SS and SM bit */
+ write_reg(par, 0x0002, 0x0700); /* set 1 line inversion */
+ write_reg(par, 0x0004, 0x0000); /* Resize register */
+ write_reg(par, 0x0008, 0x0207); /* set the back porch and front porch */
+ write_reg(par, 0x0009, 0x0000); /* set non-display area refresh cycle */
+ write_reg(par, 0x000A, 0x0000); /* FMARK function */
+ write_reg(par, 0x000C, 0x0000); /* RGB interface setting */
+ write_reg(par, 0x000D, 0x0000); /* Frame marker Position */
+ write_reg(par, 0x000F, 0x0000); /* RGB interface polarity */
+
+ /* ----------- Power On sequence ----------- */
+ write_reg(par, 0x0010, 0x0000); /* SAP, BT[3:0], AP, DSTB, SLP, STB */
+ write_reg(par, 0x0011, 0x0007); /* DC1[2:0], DC0[2:0], VC[2:0] */
+ write_reg(par, 0x0012, 0x0000); /* VREG1OUT voltage */
+ write_reg(par, 0x0013, 0x0000); /* VDV[4:0] for VCOM amplitude */
+ mdelay(200); /* Dis-charge capacitor power voltage */
+ write_reg(par, 0x0010, /* SAP, BT[3:0], AP, DSTB, SLP, STB */
+ (1 << 12) | (bt << 8) | (1 << 7) | (0b001 << 4));
+ write_reg(par, 0x0011, 0x220 | vc); /* DC1[2:0], DC0[2:0], VC[2:0] */
+ mdelay(50); /* Delay 50ms */
+ write_reg(par, 0x0012, vrh); /* Internal reference voltage= Vci; */
+ mdelay(50); /* Delay 50ms */
+ write_reg(par, 0x0013, vdv << 8); /* Set VDV[4:0] for VCOM amplitude */
+ write_reg(par, 0x0029, vcm); /* Set VCM[5:0] for VCOMH */
+ write_reg(par, 0x002B, 0x000C); /* Set Frame Rate */
+ mdelay(50); /* Delay 50ms */
+ write_reg(par, 0x0020, 0x0000); /* GRAM horizontal Address */
+ write_reg(par, 0x0021, 0x0000); /* GRAM Vertical Address */
+
+ /*------------------ Set GRAM area --------------- */
+ write_reg(par, 0x0050, 0x0000); /* Horizontal GRAM Start Address */
+ write_reg(par, 0x0051, 0x00EF); /* Horizontal GRAM End Address */
+ write_reg(par, 0x0052, 0x0000); /* Vertical GRAM Start Address */
+ write_reg(par, 0x0053, 0x013F); /* Vertical GRAM Start Address */
+ write_reg(par, 0x0060, 0xA700); /* Gate Scan Line */
+ write_reg(par, 0x0061, 0x0001); /* NDL,VLE, REV */
+ write_reg(par, 0x006A, 0x0000); /* set scrolling line */
+
+ /*-------------- Partial Display Control --------- */
+ write_reg(par, 0x0080, 0x0000);
+ write_reg(par, 0x0081, 0x0000);
+ write_reg(par, 0x0082, 0x0000);
+ write_reg(par, 0x0083, 0x0000);
+ write_reg(par, 0x0084, 0x0000);
+ write_reg(par, 0x0085, 0x0000);
+
+ /*-------------- Panel Control ------------------- */
+ write_reg(par, 0x0090, 0x0010);
+ write_reg(par, 0x0092, 0x0600);
+ write_reg(par, 0x0007, 0x0133); /* 262K color and display ON */
+
+ 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);
+ switch (par->info->var.rotate) {
+ /* R20h = Horizontal GRAM Start Address */
+ /* R21h = Vertical GRAM Start Address */
+ case 0:
+ write_reg(par, 0x0020, xs);
+ write_reg(par, 0x0021, ys);
+ break;
+ case 180:
+ write_reg(par, 0x0020, WIDTH - 1 - xs);
+ write_reg(par, 0x0021, HEIGHT - 1 - ys);
+ break;
+ case 270:
+ write_reg(par, 0x0020, WIDTH - 1 - ys);
+ write_reg(par, 0x0021, xs);
+ break;
+ case 90:
+ write_reg(par, 0x0020, ys);
+ write_reg(par, 0x0021, HEIGHT - 1 - xs);
+ break;
+ }
+ write_reg(par, 0x0022); /* Write Data to GRAM */
+}
+
+static int set_var(struct fbtft_par *par)
+{
+ fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+ switch (par->info->var.rotate) {
+ /* AM: GRAM update direction */
+ case 0:
+ write_reg(par, 0x03, 0x0030 | (par->bgr << 12));
+ break;
+ case 180:
+ write_reg(par, 0x03, 0x0000 | (par->bgr << 12));
+ break;
+ case 270:
+ write_reg(par, 0x03, 0x0028 | (par->bgr << 12));
+ break;
+ case 90:
+ write_reg(par, 0x03, 0x0018 | (par->bgr << 12));
+ break;
+ }
+
+ return 0;
+}
+
+/*
+ Gamma string format:
+ VRP0 VRP1 RP0 RP1 KP0 KP1 KP2 KP3 KP4 KP5
+ VRN0 VRN1 RN0 RN1 KN0 KN1 KN2 KN3 KN4 KN5
+*/
+#define CURVE(num, idx) curves[num*par->gamma.num_values + idx]
+static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+{
+ unsigned long mask[] = {
+ 0b11111, 0b11111, 0b111, 0b111, 0b111,
+ 0b111, 0b111, 0b111, 0b111, 0b111,
+ 0b11111, 0b11111, 0b111, 0b111, 0b111,
+ 0b111, 0b111, 0b111, 0b111, 0b111 };
+ int i, j;
+
+ fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+ /* apply mask */
+ for (i = 0; i < 2; i++)
+ for (j = 0; j < 10; j++)
+ CURVE(i, j) &= mask[i*par->gamma.num_values + j];
+
+ write_reg(par, 0x0030, CURVE(0, 5) << 8 | CURVE(0, 4));
+ write_reg(par, 0x0031, CURVE(0, 7) << 8 | CURVE(0, 6));
+ write_reg(par, 0x0032, CURVE(0, 9) << 8 | CURVE(0, 8));
+ write_reg(par, 0x0035, CURVE(0, 3) << 8 | CURVE(0, 2));
+ write_reg(par, 0x0036, CURVE(0, 1) << 8 | CURVE(0, 0));
+
+ write_reg(par, 0x0037, CURVE(1, 5) << 8 | CURVE(1, 4));
+ write_reg(par, 0x0038, CURVE(1, 7) << 8 | CURVE(1, 6));
+ write_reg(par, 0x0039, CURVE(1, 9) << 8 | CURVE(1, 8));
+ write_reg(par, 0x003C, CURVE(1, 3) << 8 | CURVE(1, 2));
+ write_reg(par, 0x003D, CURVE(1, 1) << 8 | CURVE(1, 0));
+
+ return 0;
+}
+#undef CURVE
+
+
+static struct fbtft_display display = {
+ .regwidth = 16,
+ .width = WIDTH,
+ .height = HEIGHT,
+ .bpp = BPP,
+ .fps = FPS,
+ .gamma_num = 2,
+ .gamma_len = 10,
+ .gamma = DEFAULT_GAMMA,
+ .fbtftops = {
+ .init_display = init_display,
+ .set_addr_win = set_addr_win,
+ .set_var = set_var,
+ .set_gamma = set_gamma,
+ },
+};
+FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9325", &display);
+
+MODULE_ALIAS("spi:" DRVNAME);
+MODULE_ALIAS("platform:" DRVNAME);
+MODULE_ALIAS("spi:ili9325");
+MODULE_ALIAS("platform:ili9325");
+
+MODULE_DESCRIPTION("FB driver for the ILI9325 LCD Controller");
+MODULE_AUTHOR("Noralf Tronnes");
+MODULE_LICENSE("GPL");
projects / platform / kernel / linux-starfive.git / commitdiff