1/*
  2 * Picvue PVC160206 display driver
  3 *
  4 * Brian Murphy <brian@murphy.dk>
  5 *
  6 */
  7#include <linux/kernel.h>
  8#include <linux/delay.h>
  9#include <asm/bootinfo.h>
 10#include <asm/lasat/lasat.h>
 11#include <linux/module.h>
 12#include <linux/init.h>
 13#include <linux/errno.h>
 14#include <linux/string.h>
 15
 16#include "picvue.h"
 17
 18#define PVC_BUSY		0x80
 19#define PVC_NLINES		2
 20#define PVC_DISPMEM		80
 21#define PVC_LINELEN		PVC_DISPMEM / PVC_NLINES
 22
 23struct pvc_defs *picvue;
 24
 25static void pvc_reg_write(u32 val)
 26{
 27	*picvue->reg = val;
 28}
 29
 30static u32 pvc_reg_read(void)
 31{
 32	u32 tmp = *picvue->reg;
 33	return tmp;
 34}
 35
 36static void pvc_write_byte(u32 data, u8 byte)
 37{
 38	data |= picvue->e;
 39	pvc_reg_write(data);
 40	data &= ~picvue->data_mask;
 41	data |= byte << picvue->data_shift;
 42	pvc_reg_write(data);
 43	ndelay(220);
 44	pvc_reg_write(data & ~picvue->e);
 45	ndelay(220);
 46}
 47
 48static u8 pvc_read_byte(u32 data)
 49{
 50	u8 byte;
 51
 52	data |= picvue->e;
 53	pvc_reg_write(data);
 54	ndelay(220);
 55	byte = (pvc_reg_read() & picvue->data_mask) >> picvue->data_shift;
 56	data &= ~picvue->e;
 57	pvc_reg_write(data);
 58	ndelay(220);
 59	return byte;
 60}
 61
 62static u8 pvc_read_data(void)
 63{
 64	u32 data = pvc_reg_read();
 65	u8 byte;
 66	data |= picvue->rw;
 67	data &= ~picvue->rs;
 68	pvc_reg_write(data);
 69	ndelay(40);
 70	byte = pvc_read_byte(data);
 71	data |= picvue->rs;
 72	pvc_reg_write(data);
 73	return byte;
 74}
 75
 76#define TIMEOUT 1000
 77static int pvc_wait(void)
 78{
 79	int i = TIMEOUT;
 80	int err = 0;
 81
 82	while ((pvc_read_data() & PVC_BUSY) && i)
 83		i--;
 84	if (i == 0)
 85		err = -ETIME;
 86
 87	return err;
 88}
 89
 90#define MODE_INST 0
 91#define MODE_DATA 1
 92static void pvc_write(u8 byte, int mode)
 93{
 94	u32 data = pvc_reg_read();
 95	data &= ~picvue->rw;
 96	if (mode == MODE_DATA)
 97		data |= picvue->rs;
 98	else
 99		data &= ~picvue->rs;
100	pvc_reg_write(data);
101	ndelay(40);
102	pvc_write_byte(data, byte);
103	if (mode == MODE_DATA)
104		data &= ~picvue->rs;
105	else
106		data |= picvue->rs;
107	pvc_reg_write(data);
108	pvc_wait();
109}
110
111void pvc_write_string(const unsigned char *str, u8 addr, int line)
112{
113	int i = 0;
114
115	if (line > 0 && (PVC_NLINES > 1))
116		addr += 0x40 * line;
117	pvc_write(0x80 | addr, MODE_INST);
118
119	while (*str != 0 && i < PVC_LINELEN) {
120		pvc_write(*str++, MODE_DATA);
121		i++;
122	}
123}
124
125void pvc_write_string_centered(const unsigned char *str, int line)
126{
127	int len = strlen(str);
128	u8 addr;
129
130	if (len > PVC_VISIBLE_CHARS)
131		addr = 0;
132	else
133		addr = (PVC_VISIBLE_CHARS - strlen(str))/2;
134
135	pvc_write_string(str, addr, line);
136}
137
138void pvc_dump_string(const unsigned char *str)
139{
140	int len = strlen(str);
141
142	pvc_write_string(str, 0, 0);
143	if (len > PVC_VISIBLE_CHARS)
144		pvc_write_string(&str[PVC_VISIBLE_CHARS], 0, 1);
145}
146
147#define BM_SIZE			8
148#define MAX_PROGRAMMABLE_CHARS	8
149int pvc_program_cg(int charnum, u8 bitmap[BM_SIZE])
150{
151	int i;
152	int addr;
153
154	if (charnum > MAX_PROGRAMMABLE_CHARS)
155		return -ENOENT;
156
157	addr = charnum * 8;
158	pvc_write(0x40 | addr, MODE_INST);
159
160	for (i = 0; i < BM_SIZE; i++)
161		pvc_write(bitmap[i], MODE_DATA);
162	return 0;
163}
164
165#define FUNC_SET_CMD	0x20
166#define  EIGHT_BYTE	(1 << 4)
167#define  FOUR_BYTE	0
168#define  TWO_LINES	(1 << 3)
169#define  ONE_LINE	0
170#define  LARGE_FONT	(1 << 2)
171#define  SMALL_FONT	0
172
173static void pvc_funcset(u8 cmd)
174{
175	pvc_write(FUNC_SET_CMD | (cmd & (EIGHT_BYTE|TWO_LINES|LARGE_FONT)),
176		  MODE_INST);
177}
178
179#define ENTRYMODE_CMD		0x4
180#define  AUTO_INC		(1 << 1)
181#define  AUTO_DEC		0
182#define  CURSOR_FOLLOWS_DISP	(1 << 0)
183
184static void pvc_entrymode(u8 cmd)
185{
186	pvc_write(ENTRYMODE_CMD | (cmd & (AUTO_INC|CURSOR_FOLLOWS_DISP)),
187		  MODE_INST);
188}
189
190#define DISP_CNT_CMD	0x08
191#define  DISP_OFF	0
192#define  DISP_ON	(1 << 2)
193#define  CUR_ON		(1 << 1)
194#define  CUR_BLINK	(1 << 0)
195void pvc_dispcnt(u8 cmd)
196{
197	pvc_write(DISP_CNT_CMD | (cmd & (DISP_ON|CUR_ON|CUR_BLINK)), MODE_INST);
198}
199
200#define MOVE_CMD	0x10
201#define  DISPLAY	(1 << 3)
202#define  CURSOR		0
203#define  RIGHT		(1 << 2)
204#define  LEFT		0
205void pvc_move(u8 cmd)
206{
207	pvc_write(MOVE_CMD | (cmd & (DISPLAY|RIGHT)), MODE_INST);
208}
209
210#define CLEAR_CMD	0x1
211void pvc_clear(void)
212{
213	pvc_write(CLEAR_CMD, MODE_INST);
214}
215
216#define HOME_CMD	0x2
217void pvc_home(void)
218{
219	pvc_write(HOME_CMD, MODE_INST);
220}
221
222int pvc_init(void)
223{
224	u8 cmd = EIGHT_BYTE;
225
226	if (PVC_NLINES == 2)
227		cmd |= (SMALL_FONT|TWO_LINES);
228	else
229		cmd |= (LARGE_FONT|ONE_LINE);
230	pvc_funcset(cmd);
231	pvc_dispcnt(DISP_ON);
232	pvc_entrymode(AUTO_INC);
233
234	pvc_clear();
235	pvc_write_string_centered("Display", 0);
236	pvc_write_string_centered("Initialized", 1);
237
238	return 0;
239}
240
241module_init(pvc_init);
242MODULE_LICENSE("GPL");