1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Support for SuperH MigoR Quarter VGA LCD Panel 4 * 5 * Copyright (C) 2008 Magnus Damm 6 * 7 * Based on lcd_powertip.c from Kenati Technologies Pvt Ltd. 8 * Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>, 9 */ 10 11 #include <linux/delay.h> 12 #include <linux/err.h> 13 #include <linux/fb.h> 14 #include <linux/init.h> 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/gpio.h> 18 #include <video/sh_mobile_lcdc.h> 19 #include <cpu/sh7722.h> 20 #include <mach/migor.h> 21 22 /* LCD Module is a PH240320T according to board schematics. This module 23 * is made up of a 240x320 LCD hooked up to a R61505U (or HX8347-A01?) 24 * Driver IC. This IC is connected to the SH7722 built-in LCDC using a 25 * SYS-80 interface configured in 16 bit mode. 26 * 27 * Index 0: "Device Code Read" returns 0x1505. 28 */ 29 30 static void reset_lcd_module(void) 31 { 32 gpio_set_value(GPIO_PTH2, 0); 33 mdelay(2); 34 gpio_set_value(GPIO_PTH2, 1); 35 mdelay(1); 36 } 37 38 /* DB0-DB7 are connected to D1-D8, and DB8-DB15 to D10-D17 */ 39 40 static unsigned long adjust_reg18(unsigned short data) 41 { 42 unsigned long tmp1, tmp2; 43 44 tmp1 = (data<<1 | 0x00000001) & 0x000001FF; 45 tmp2 = (data<<2 | 0x00000200) & 0x0003FE00; 46 return tmp1 | tmp2; 47 } 48 49 static void write_reg(void *sys_ops_handle, 50 struct sh_mobile_lcdc_sys_bus_ops *sys_ops, 51 unsigned short reg, unsigned short data) 52 { 53 sys_ops->write_index(sys_ops_handle, adjust_reg18(reg << 8 | data)); 54 } 55 56 static void write_reg16(void *sys_ops_handle, 57 struct sh_mobile_lcdc_sys_bus_ops *sys_ops, 58 unsigned short reg, unsigned short data) 59 { 60 sys_ops->write_index(sys_ops_handle, adjust_reg18(reg)); 61 sys_ops->write_data(sys_ops_handle, adjust_reg18(data)); 62 } 63 64 static unsigned long read_reg16(void *sys_ops_handle, 65 struct sh_mobile_lcdc_sys_bus_ops *sys_ops, 66 unsigned short reg) 67 { 68 unsigned long data; 69 70 sys_ops->write_index(sys_ops_handle, adjust_reg18(reg)); 71 data = sys_ops->read_data(sys_ops_handle); 72 return ((data >> 1) & 0xff) | ((data >> 2) & 0xff00); 73 } 74 75 static void migor_lcd_qvga_seq(void *sys_ops_handle, 76 struct sh_mobile_lcdc_sys_bus_ops *sys_ops, 77 unsigned short const *data, int no_data) 78 { 79 int i; 80 81 for (i = 0; i < no_data; i += 2) 82 write_reg16(sys_ops_handle, sys_ops, data[i], data[i + 1]); 83 } 84 85 static const unsigned short sync_data[] = { 86 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 87 }; 88 89 static const unsigned short magic0_data[] = { 90 0x0060, 0x2700, 0x0008, 0x0808, 0x0090, 0x001A, 0x0007, 0x0001, 91 0x0017, 0x0001, 0x0019, 0x0000, 0x0010, 0x17B0, 0x0011, 0x0116, 92 0x0012, 0x0198, 0x0013, 0x1400, 0x0029, 0x000C, 0x0012, 0x01B8, 93 }; 94 95 static const unsigned short magic1_data[] = { 96 0x0030, 0x0307, 0x0031, 0x0303, 0x0032, 0x0603, 0x0033, 0x0202, 97 0x0034, 0x0202, 0x0035, 0x0202, 0x0036, 0x1F1F, 0x0037, 0x0303, 98 0x0038, 0x0303, 0x0039, 0x0603, 0x003A, 0x0202, 0x003B, 0x0102, 99 0x003C, 0x0204, 0x003D, 0x0000, 0x0001, 0x0100, 0x0002, 0x0300, 100 0x0003, 0x5028, 0x0020, 0x00ef, 0x0021, 0x0000, 0x0004, 0x0000, 101 0x0009, 0x0000, 0x000A, 0x0008, 0x000C, 0x0000, 0x000D, 0x0000, 102 0x0015, 0x8000, 103 }; 104 105 static const unsigned short magic2_data[] = { 106 0x0061, 0x0001, 0x0092, 0x0100, 0x0093, 0x0001, 0x0007, 0x0021, 107 }; 108 109 static const unsigned short magic3_data[] = { 110 0x0010, 0x16B0, 0x0011, 0x0111, 0x0007, 0x0061, 111 }; 112 113 int migor_lcd_qvga_setup(void *sohandle, struct sh_mobile_lcdc_sys_bus_ops *so) 114 { 115 unsigned long xres = 320; 116 unsigned long yres = 240; 117 int k; 118 119 reset_lcd_module(); 120 migor_lcd_qvga_seq(sohandle, so, sync_data, ARRAY_SIZE(sync_data)); 121 122 if (read_reg16(sohandle, so, 0) != 0x1505) 123 return -ENODEV; 124 125 pr_info("Migo-R QVGA LCD Module detected.\n"); 126 127 migor_lcd_qvga_seq(sohandle, so, sync_data, ARRAY_SIZE(sync_data)); 128 write_reg16(sohandle, so, 0x00A4, 0x0001); 129 mdelay(10); 130 131 migor_lcd_qvga_seq(sohandle, so, magic0_data, ARRAY_SIZE(magic0_data)); 132 mdelay(100); 133 134 migor_lcd_qvga_seq(sohandle, so, magic1_data, ARRAY_SIZE(magic1_data)); 135 write_reg16(sohandle, so, 0x0050, 0xef - (yres - 1)); 136 write_reg16(sohandle, so, 0x0051, 0x00ef); 137 write_reg16(sohandle, so, 0x0052, 0x0000); 138 write_reg16(sohandle, so, 0x0053, xres - 1); 139 140 migor_lcd_qvga_seq(sohandle, so, magic2_data, ARRAY_SIZE(magic2_data)); 141 mdelay(10); 142 143 migor_lcd_qvga_seq(sohandle, so, magic3_data, ARRAY_SIZE(magic3_data)); 144 mdelay(40); 145 146 /* clear GRAM to avoid displaying garbage */ 147 148 write_reg16(sohandle, so, 0x0020, 0x0000); /* horiz addr */ 149 write_reg16(sohandle, so, 0x0021, 0x0000); /* vert addr */ 150 151 for (k = 0; k < (xres * 256); k++) /* yes, 256 words per line */ 152 write_reg16(sohandle, so, 0x0022, 0x0000); 153 154 write_reg16(sohandle, so, 0x0020, 0x0000); /* reset horiz addr */ 155 write_reg16(sohandle, so, 0x0021, 0x0000); /* reset vert addr */ 156 write_reg16(sohandle, so, 0x0007, 0x0173); 157 mdelay(40); 158 159 /* enable display */ 160 write_reg(sohandle, so, 0x00, 0x22); 161 mdelay(100); 162 return 0; 163 } 164