1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) Intel Corp. 2007. 4 * All Rights Reserved. 5 * 6 * Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to 7 * develop this driver. 8 * 9 * This file is part of the Carillo Ranch video subsystem driver. 10 * 11 * Authors: 12 * Thomas Hellstrom <thomas-at-tungstengraphics-dot-com> 13 * Alan Hourihane <alanh-at-tungstengraphics-dot-com> 14 */ 15 16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 17 18 #include <linux/module.h> 19 #include <linux/kernel.h> 20 #include <linux/init.h> 21 #include <linux/platform_device.h> 22 #include <linux/mutex.h> 23 #include <linux/fb.h> 24 #include <linux/backlight.h> 25 #include <linux/lcd.h> 26 #include <linux/pci.h> 27 #include <linux/slab.h> 28 29 /* The LVDS- and panel power controls sits on the 30 * GPIO port of the ISA bridge. 31 */ 32 33 #define CRVML_DEVICE_LPC 0x27B8 34 #define CRVML_REG_GPIOBAR 0x48 35 #define CRVML_REG_GPIOEN 0x4C 36 #define CRVML_GPIOEN_BIT (1 << 4) 37 #define CRVML_PANEL_PORT 0x38 38 #define CRVML_LVDS_ON 0x00000001 39 #define CRVML_PANEL_ON 0x00000002 40 #define CRVML_BACKLIGHT_OFF 0x00000004 41 42 /* The PLL Clock register sits on Host bridge */ 43 #define CRVML_DEVICE_MCH 0x5001 44 #define CRVML_REG_MCHBAR 0x44 45 #define CRVML_REG_MCHEN 0x54 46 #define CRVML_MCHEN_BIT (1 << 28) 47 #define CRVML_MCHMAP_SIZE 4096 48 #define CRVML_REG_CLOCK 0xc3c 49 #define CRVML_CLOCK_SHIFT 8 50 #define CRVML_CLOCK_MASK 0x00000f00 51 52 static struct pci_dev *lpc_dev; 53 static u32 gpio_bar; 54 55 struct cr_panel { 56 struct backlight_device *cr_backlight_device; 57 struct lcd_device *cr_lcd_device; 58 }; 59 60 static int cr_backlight_set_intensity(struct backlight_device *bd) 61 { 62 u32 addr = gpio_bar + CRVML_PANEL_PORT; 63 u32 cur = inl(addr); 64 65 if (backlight_get_brightness(bd) == 0) { 66 /* OFF */ 67 cur |= CRVML_BACKLIGHT_OFF; 68 outl(cur, addr); 69 } else { 70 /* FULL ON */ 71 cur &= ~CRVML_BACKLIGHT_OFF; 72 outl(cur, addr); 73 } 74 75 return 0; 76 } 77 78 static int cr_backlight_get_intensity(struct backlight_device *bd) 79 { 80 u32 addr = gpio_bar + CRVML_PANEL_PORT; 81 u32 cur = inl(addr); 82 u8 intensity; 83 84 if (cur & CRVML_BACKLIGHT_OFF) 85 intensity = 0; 86 else 87 intensity = 1; 88 89 return intensity; 90 } 91 92 static const struct backlight_ops cr_backlight_ops = { 93 .get_brightness = cr_backlight_get_intensity, 94 .update_status = cr_backlight_set_intensity, 95 }; 96 97 static void cr_panel_on(void) 98 { 99 u32 addr = gpio_bar + CRVML_PANEL_PORT; 100 u32 cur = inl(addr); 101 102 if (!(cur & CRVML_PANEL_ON)) { 103 /* Make sure LVDS controller is down. */ 104 if (cur & 0x00000001) { 105 cur &= ~CRVML_LVDS_ON; 106 outl(cur, addr); 107 } 108 /* Power up Panel */ 109 schedule_timeout(HZ / 10); 110 cur |= CRVML_PANEL_ON; 111 outl(cur, addr); 112 } 113 114 /* Power up LVDS controller */ 115 116 if (!(cur & CRVML_LVDS_ON)) { 117 schedule_timeout(HZ / 10); 118 outl(cur | CRVML_LVDS_ON, addr); 119 } 120 } 121 122 static void cr_panel_off(void) 123 { 124 u32 addr = gpio_bar + CRVML_PANEL_PORT; 125 u32 cur = inl(addr); 126 127 /* Power down LVDS controller first to avoid high currents */ 128 if (cur & CRVML_LVDS_ON) { 129 cur &= ~CRVML_LVDS_ON; 130 outl(cur, addr); 131 } 132 if (cur & CRVML_PANEL_ON) { 133 schedule_timeout(HZ / 10); 134 outl(cur & ~CRVML_PANEL_ON, addr); 135 } 136 } 137 138 static int cr_lcd_set_power(struct lcd_device *ld, int power) 139 { 140 if (power == FB_BLANK_UNBLANK) 141 cr_panel_on(); 142 if (power == FB_BLANK_POWERDOWN) 143 cr_panel_off(); 144 145 return 0; 146 } 147 148 static struct lcd_ops cr_lcd_ops = { 149 .set_power = cr_lcd_set_power, 150 }; 151 152 static int cr_backlight_probe(struct platform_device *pdev) 153 { 154 struct backlight_properties props; 155 struct backlight_device *bdp; 156 struct lcd_device *ldp; 157 struct cr_panel *crp; 158 u8 dev_en; 159 160 lpc_dev = pci_get_device(PCI_VENDOR_ID_INTEL, 161 CRVML_DEVICE_LPC, NULL); 162 if (!lpc_dev) { 163 pr_err("INTEL CARILLO RANCH LPC not found.\n"); 164 return -ENODEV; 165 } 166 167 pci_read_config_byte(lpc_dev, CRVML_REG_GPIOEN, &dev_en); 168 if (!(dev_en & CRVML_GPIOEN_BIT)) { 169 pr_err("Carillo Ranch GPIO device was not enabled.\n"); 170 pci_dev_put(lpc_dev); 171 return -ENODEV; 172 } 173 174 memset(&props, 0, sizeof(struct backlight_properties)); 175 props.type = BACKLIGHT_RAW; 176 bdp = devm_backlight_device_register(&pdev->dev, "cr-backlight", 177 &pdev->dev, NULL, &cr_backlight_ops, 178 &props); 179 if (IS_ERR(bdp)) { 180 pci_dev_put(lpc_dev); 181 return PTR_ERR(bdp); 182 } 183 184 ldp = devm_lcd_device_register(&pdev->dev, "cr-lcd", &pdev->dev, NULL, 185 &cr_lcd_ops); 186 if (IS_ERR(ldp)) { 187 pci_dev_put(lpc_dev); 188 return PTR_ERR(ldp); 189 } 190 191 pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR, 192 &gpio_bar); 193 gpio_bar &= ~0x3F; 194 195 crp = devm_kzalloc(&pdev->dev, sizeof(*crp), GFP_KERNEL); 196 if (!crp) { 197 pci_dev_put(lpc_dev); 198 return -ENOMEM; 199 } 200 201 crp->cr_backlight_device = bdp; 202 crp->cr_lcd_device = ldp; 203 crp->cr_backlight_device->props.power = FB_BLANK_UNBLANK; 204 crp->cr_backlight_device->props.brightness = 0; 205 cr_backlight_set_intensity(crp->cr_backlight_device); 206 cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_UNBLANK); 207 208 platform_set_drvdata(pdev, crp); 209 210 return 0; 211 } 212 213 static int cr_backlight_remove(struct platform_device *pdev) 214 { 215 struct cr_panel *crp = platform_get_drvdata(pdev); 216 217 crp->cr_backlight_device->props.power = FB_BLANK_POWERDOWN; 218 crp->cr_backlight_device->props.brightness = 0; 219 crp->cr_backlight_device->props.max_brightness = 0; 220 cr_backlight_set_intensity(crp->cr_backlight_device); 221 cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_POWERDOWN); 222 pci_dev_put(lpc_dev); 223 224 return 0; 225 } 226 227 static struct platform_driver cr_backlight_driver = { 228 .probe = cr_backlight_probe, 229 .remove = cr_backlight_remove, 230 .driver = { 231 .name = "cr_backlight", 232 }, 233 }; 234 235 static struct platform_device *crp; 236 237 static int __init cr_backlight_init(void) 238 { 239 int ret = platform_driver_register(&cr_backlight_driver); 240 241 if (ret) 242 return ret; 243 244 crp = platform_device_register_simple("cr_backlight", -1, NULL, 0); 245 if (IS_ERR(crp)) { 246 platform_driver_unregister(&cr_backlight_driver); 247 return PTR_ERR(crp); 248 } 249 250 pr_info("Carillo Ranch Backlight Driver Initialized.\n"); 251 252 return 0; 253 } 254 255 static void __exit cr_backlight_exit(void) 256 { 257 platform_device_unregister(crp); 258 platform_driver_unregister(&cr_backlight_driver); 259 } 260 261 module_init(cr_backlight_init); 262 module_exit(cr_backlight_exit); 263 264 MODULE_AUTHOR("Tungsten Graphics Inc."); 265 MODULE_DESCRIPTION("Carillo Ranch Backlight Driver"); 266 MODULE_LICENSE("GPL"); 267