2 * drivers/video/ubicom32lcd.c
3 * LCD initilization code
5 * (C) Copyright 2009, Ubicom, Inc.
7 * This file is part of the Ubicom32 Linux Kernel Port.
9 * The Ubicom32 Linux Kernel Port is free software: you can redistribute
10 * it and/or modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation, either version 2 of the
12 * License, or (at your option) any later version.
14 * The Ubicom32 Linux Kernel Port is distributed in the hope that it
15 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
16 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with the Ubicom32 Linux Kernel Port. If not,
21 * see <http://www.gnu.org/licenses/>.
23 #include <linux/init.h>
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/platform_device.h>
27 #include <linux/delay.h>
29 #include <asm/ip5000.h>
31 #include <asm/ubicom32lcd.h>
33 #include "ubicom32lcd.h"
35 #define DRIVER_NAME "ubicom32lcd"
37 struct ubicom32lcd_data {
38 const struct ubicom32lcd_panel *panel;
45 struct ubicom32_io_port *port_data;
51 * Performs a write cycle on the bus (assumes CS asserted, RD & WR set)
53 static void ubicom32lcd_write(struct ubicom32lcd_data *ud, int command, u16 data)
56 UBICOM32_GPIO_SET_PIN_LOW(ud->pin_rs);
58 UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rs);
62 "or.4 4(%[port]), 4(%[port]), %[mask] \n\t"
63 "not.4 %[mask], %[mask] \n\t"
64 "and.4 8(%[port]), 8(%[port]), %[mask] \n\t"
65 "or.4 8(%[port]), 8(%[port]), %[cmd] \n\t"
67 : [port] "a" (ud->port_data),
68 [mask] "d" (0xFFFF << ud->data_shift),
69 [cmd] "d" (data << ud->data_shift)
73 UBICOM32_GPIO_SET_PIN_LOW(ud->pin_wr);
78 UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_wr);
85 * ubicom32lcd_read_data
86 * Performs a read cycle on the bus (assumes CS asserted, RD & WR set)
88 static u16 ubicom32lcd_read_data(struct ubicom32lcd_data *ud)
92 UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rs);
95 "and.4 4(%[port]), 4(%[port]), %[mask]\n\t"
97 : [port] "a" (ud->port_data),
98 [mask] "d" (~(0xFFFF << ud->data_shift))
102 UBICOM32_GPIO_SET_PIN_LOW(ud->pin_rd);
107 "lsr.4 %[data], 12(%[port]), %[shamt] \n\t"
108 "and.4 %[data], %[data], %[mask] \n\t"
110 : [port] "a" (ud->port_data),
112 [shamt] "d" (ud->data_shift)
118 UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rd);
126 * ubicom32lcd_execute
127 * Executes a script for performing operations on the LCD (assumes CS set)
129 static void ubicom32lcd_execute(struct ubicom32lcd_data *ud, const struct ubicom32lcd_step *script)
132 switch (script->op) {
134 ubicom32lcd_write(ud, 1, script->cmd);
138 ubicom32lcd_write(ud, 0, script->data);
141 case LCD_STEP_CMD_DATA:
142 ubicom32lcd_write(ud, 1, script->cmd);
143 ubicom32lcd_write(ud, 0, script->data);
147 udelay(script->data);
159 * Places the gram pointer at a specific X, Y address
161 static void ubicom32lcd_goto(struct ubicom32lcd_data *ud, int x, int y)
163 ubicom32lcd_write(ud, 1, ud->panel->horz_reg);
164 ubicom32lcd_write(ud, 0, x);
165 ubicom32lcd_write(ud, 1, ud->panel->vert_reg);
166 ubicom32lcd_write(ud, 0, y);
167 ubicom32lcd_write(ud, 1, ud->panel->gram_reg);
171 * ubicom32lcd_panel_init
172 * Initializes the lcd panel.
174 static int ubicom32lcd_panel_init(struct ubicom32lcd_data *ud)
178 UBICOM32_GPIO_SET_PIN_LOW(ud->pin_reset);
179 UBICOM32_GPIO_SET_PIN_OUTPUT(ud->pin_reset);
180 UBICOM32_GPIO_ENABLE(ud->pin_reset);
183 "or.4 0x50(%[port]), 0x50(%[port]), %[mask] \n\t"
184 "not.4 %[mask], %[mask] \n\t"
185 "and.4 0x04(%[port]), 0x04(%[port]), %[mask] \n\t"
187 : [port] "a" (ud->port_data),
188 [mask] "d" (0xFFFF << ud->data_shift)
192 UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rs);
193 UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rd);
194 UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_wr);
195 UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_cs);
197 UBICOM32_GPIO_SET_PIN_OUTPUT(ud->pin_rs);
198 UBICOM32_GPIO_SET_PIN_OUTPUT(ud->pin_rd);
199 UBICOM32_GPIO_SET_PIN_OUTPUT(ud->pin_wr);
200 UBICOM32_GPIO_SET_PIN_OUTPUT(ud->pin_cs);
202 UBICOM32_GPIO_ENABLE(ud->pin_rs);
203 UBICOM32_GPIO_ENABLE(ud->pin_rd);
204 UBICOM32_GPIO_ENABLE(ud->pin_wr);
205 UBICOM32_GPIO_ENABLE(ud->pin_cs);
209 UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_reset);
213 UBICOM32_GPIO_SET_PIN_LOW(ud->pin_cs);
215 id = ubicom32lcd_read_data(ud);
218 * We will try to figure out what kind of panel we have if we were not told.
221 const struct ubicom32lcd_panel **p = ubicom32lcd_panels;
223 if ((*p)->id && ((*p)->id == id)) {
229 printk(KERN_WARNING DRIVER_NAME ":Could not find compatible panel, id=%x\n", id);
236 * Make sure panel ID matches if we were supplied a panel type
238 if (ud->panel->id && (ud->panel->id != id)) {
239 UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_cs);
244 ubicom32lcd_execute(ud, ud->panel->init_seq);
246 ubicom32lcd_goto(ud, 0, 0);
248 UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_cs);
249 UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rd);
250 UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_wr);
251 UBICOM32_GPIO_SET_PIN_HIGH(ud->pin_rs);
253 printk(KERN_INFO DRIVER_NAME ": Initialized panel %s\n", ud->panel->desc);
261 static int ubicom32lcd_probe(struct platform_device *pdev)
263 const struct ubicom32lcd_platform_data *pdata = pdev->dev.platform_data;
264 struct ubicom32lcd_data *ud;
268 * Allocate our private data
270 ud = kzalloc(sizeof(struct ubicom32lcd_data), GFP_KERNEL);
276 ud->pin_cs = pdata->pin_cs;
277 ud->pin_rd = pdata->pin_rd;
278 ud->pin_wr = pdata->pin_wr;
279 ud->pin_rs = pdata->pin_rs;
280 ud->pin_reset = pdata->pin_reset;
281 ud->port_data = pdata->port_data;
282 ud->data_shift = pdata->data_shift;
287 ud->pin_cs = GPIO_RD_4;
288 ud->pin_rd = GPIO_RD_5;
289 ud->pin_rs = GPIO_RD_3;
290 ud->pin_wr = GPIO_RD_2;
291 ud->pin_reset = GPIO_RD_7;
292 ud->port_data = (struct ubicom32_io_port *)RI;
297 * Initialize the display
299 retval = ubicom32lcd_panel_init(ud);
305 printk(KERN_INFO DRIVER_NAME ": LCD initialized\n");
313 static int __exit ubicom32lcd_remove(struct platform_device *pdev)
315 struct ubicom32lcd_data *ud = platform_get_drvdata(pdev);
322 static struct platform_driver ubicom32lcd_driver = {
323 .probe = ubicom32lcd_probe,
324 .remove = ubicom32lcd_remove,
328 .owner = THIS_MODULE,
331 .remove = __exit_p(ubicom32lcd_remove),
334 static struct platform_device *ubicom32lcd_device;
339 static int __init ubicom32lcd_init(void)
343 res = platform_driver_register(&ubicom32lcd_driver);
345 ubicom32lcd_device = platform_device_alloc(DRIVER_NAME, 0);
346 if (ubicom32lcd_device) {
347 res = platform_device_add(ubicom32lcd_device);
352 platform_device_put(ubicom32lcd_device);
353 platform_driver_unregister(&ubicom32lcd_driver);
358 module_init(ubicom32lcd_init);
363 static void __exit ubicom32lcd_exit(void)
365 platform_device_unregister(ubicom32lcd_device);
366 platform_driver_unregister(&ubicom32lcd_driver);
368 module_exit(ubicom32lcd_exit);
370 MODULE_AUTHOR("Patrick Tjin <@ubicom.com>");
371 MODULE_DESCRIPTION("Ubicom32 LCD driver");
372 MODULE_LICENSE("GPL");