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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/staging/fbtft/fb_ra8875.c
2 * FBTFT driver for the RA8875 LCD Controller
3 * Copyright by Pf@nne & NOTRO
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/init.h>
19 #include <linux/delay.h>
21 #include <linux/gpio.h>
24 #define DRVNAME "fb_ra8875"
26 static int write_spi(struct fbtft_par
*par
, void *buf
, size_t len
)
28 struct spi_transfer t
= {
35 fbtft_par_dbg_hex(DEBUG_WRITE
, par
, par
->info
->device
, u8
, buf
, len
,
36 "%s(len=%d): ", __func__
, len
);
39 dev_err(par
->info
->device
,
40 "%s: par->spi is unexpectedly NULL\n", __func__
);
45 spi_message_add_tail(&t
, &m
);
46 return spi_sync(par
->spi
, &m
);
49 static int init_display(struct fbtft_par
*par
)
51 gpio_set_value(par
->gpio
.dc
, 1);
53 fbtft_par_dbg(DEBUG_INIT_DISPLAY
, par
,
55 fbtft_par_dbg(DEBUG_INIT_DISPLAY
, par
,
56 "display size %dx%d\n",
60 par
->fbtftops
.reset(par
);
62 if ((par
->info
->var
.xres
== 320) && (par
->info
->var
.yres
== 240)) {
63 /* PLL clock frequency */
64 write_reg(par
, 0x88, 0x0A);
65 write_reg(par
, 0x89, 0x02);
67 /* color deep / MCU Interface */
68 write_reg(par
, 0x10, 0x0C);
69 /* pixel clock period */
70 write_reg(par
, 0x04, 0x03);
72 /* horizontal settings */
73 write_reg(par
, 0x14, 0x27);
74 write_reg(par
, 0x15, 0x00);
75 write_reg(par
, 0x16, 0x05);
76 write_reg(par
, 0x17, 0x04);
77 write_reg(par
, 0x18, 0x03);
78 /* vertical settings */
79 write_reg(par
, 0x19, 0xEF);
80 write_reg(par
, 0x1A, 0x00);
81 write_reg(par
, 0x1B, 0x05);
82 write_reg(par
, 0x1C, 0x00);
83 write_reg(par
, 0x1D, 0x0E);
84 write_reg(par
, 0x1E, 0x00);
85 write_reg(par
, 0x1F, 0x02);
86 } else if ((par
->info
->var
.xres
== 480) &&
87 (par
->info
->var
.yres
== 272)) {
88 /* PLL clock frequency */
89 write_reg(par
, 0x88, 0x0A);
90 write_reg(par
, 0x89, 0x02);
92 /* color deep / MCU Interface */
93 write_reg(par
, 0x10, 0x0C);
94 /* pixel clock period */
95 write_reg(par
, 0x04, 0x82);
97 /* horizontal settings */
98 write_reg(par
, 0x14, 0x3B);
99 write_reg(par
, 0x15, 0x00);
100 write_reg(par
, 0x16, 0x01);
101 write_reg(par
, 0x17, 0x00);
102 write_reg(par
, 0x18, 0x05);
103 /* vertical settings */
104 write_reg(par
, 0x19, 0x0F);
105 write_reg(par
, 0x1A, 0x01);
106 write_reg(par
, 0x1B, 0x02);
107 write_reg(par
, 0x1C, 0x00);
108 write_reg(par
, 0x1D, 0x07);
109 write_reg(par
, 0x1E, 0x00);
110 write_reg(par
, 0x1F, 0x09);
111 } else if ((par
->info
->var
.xres
== 640) &&
112 (par
->info
->var
.yres
== 480)) {
113 /* PLL clock frequency */
114 write_reg(par
, 0x88, 0x0B);
115 write_reg(par
, 0x89, 0x02);
117 /* color deep / MCU Interface */
118 write_reg(par
, 0x10, 0x0C);
119 /* pixel clock period */
120 write_reg(par
, 0x04, 0x01);
122 /* horizontal settings */
123 write_reg(par
, 0x14, 0x4F);
124 write_reg(par
, 0x15, 0x05);
125 write_reg(par
, 0x16, 0x0F);
126 write_reg(par
, 0x17, 0x01);
127 write_reg(par
, 0x18, 0x00);
128 /* vertical settings */
129 write_reg(par
, 0x19, 0xDF);
130 write_reg(par
, 0x1A, 0x01);
131 write_reg(par
, 0x1B, 0x0A);
132 write_reg(par
, 0x1C, 0x00);
133 write_reg(par
, 0x1D, 0x0E);
134 write_reg(par
, 0x1E, 0x00);
135 write_reg(par
, 0x1F, 0x01);
136 } else if ((par
->info
->var
.xres
== 800) &&
137 (par
->info
->var
.yres
== 480)) {
138 /* PLL clock frequency */
139 write_reg(par
, 0x88, 0x0B);
140 write_reg(par
, 0x89, 0x02);
142 /* color deep / MCU Interface */
143 write_reg(par
, 0x10, 0x0C);
144 /* pixel clock period */
145 write_reg(par
, 0x04, 0x81);
147 /* horizontal settings */
148 write_reg(par
, 0x14, 0x63);
149 write_reg(par
, 0x15, 0x03);
150 write_reg(par
, 0x16, 0x03);
151 write_reg(par
, 0x17, 0x02);
152 write_reg(par
, 0x18, 0x00);
153 /* vertical settings */
154 write_reg(par
, 0x19, 0xDF);
155 write_reg(par
, 0x1A, 0x01);
156 write_reg(par
, 0x1B, 0x14);
157 write_reg(par
, 0x1C, 0x00);
158 write_reg(par
, 0x1D, 0x06);
159 write_reg(par
, 0x1E, 0x00);
160 write_reg(par
, 0x1F, 0x01);
162 dev_err(par
->info
->device
, "display size is not supported!!");
167 write_reg(par
, 0x8a, 0x81);
168 write_reg(par
, 0x8b, 0xFF);
172 write_reg(par
, 0x01, 0x80);
178 static void set_addr_win(struct fbtft_par
*par
, int xs
, int ys
, int xe
, int ye
)
180 /* Set_Active_Window */
181 write_reg(par
, 0x30, xs
& 0x00FF);
182 write_reg(par
, 0x31, (xs
& 0xFF00) >> 8);
183 write_reg(par
, 0x32, ys
& 0x00FF);
184 write_reg(par
, 0x33, (ys
& 0xFF00) >> 8);
185 write_reg(par
, 0x34, (xs
+ xe
) & 0x00FF);
186 write_reg(par
, 0x35, ((xs
+ xe
) & 0xFF00) >> 8);
187 write_reg(par
, 0x36, (ys
+ ye
) & 0x00FF);
188 write_reg(par
, 0x37, ((ys
+ ye
) & 0xFF00) >> 8);
190 /* Set_Memory_Write_Cursor */
191 write_reg(par
, 0x46, xs
& 0xff);
192 write_reg(par
, 0x47, (xs
>> 8) & 0x03);
193 write_reg(par
, 0x48, ys
& 0xff);
194 write_reg(par
, 0x49, (ys
>> 8) & 0x01);
196 write_reg(par
, 0x02);
199 static void write_reg8_bus8(struct fbtft_par
*par
, int len
, ...)
205 /* slow down spi-speed for writing registers */
206 par
->fbtftops
.write
= write_spi
;
208 if (unlikely(par
->debug
& DEBUG_WRITE_REGISTER
)) {
210 for (i
= 0; i
< len
; i
++)
211 buf
[i
] = (u8
)va_arg(args
, unsigned int);
213 fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER
, par
, par
->info
->device
,
214 u8
, buf
, len
, "%s: ", __func__
);
219 *buf
= (u8
)va_arg(args
, unsigned int);
220 ret
= par
->fbtftops
.write(par
, par
->buf
, 2);
223 dev_err(par
->info
->device
, "write() failed and returned %dn",
232 buf
= (u8
*)par
->buf
;
236 *buf
++ = (u8
)va_arg(args
, unsigned int);
238 ret
= par
->fbtftops
.write(par
, par
->buf
, len
+ 1);
241 dev_err(par
->info
->device
,
242 "write() failed and returned %dn", ret
);
248 /* restore user spi-speed */
249 par
->fbtftops
.write
= fbtft_write_spi
;
253 static int write_vmem16_bus8(struct fbtft_par
*par
, size_t offset
, size_t len
)
256 u16
*txbuf16
= par
->txbuf
.buf
;
259 size_t tx_array_size
;
262 size_t startbyte_size
= 0;
264 fbtft_par_dbg(DEBUG_WRITE_VMEM
, par
, "%s(offset=%zu, len=%zu)\n",
265 __func__
, offset
, len
);
268 vmem16
= (u16
*)(par
->info
->screen_buffer
+ offset
);
269 tx_array_size
= par
->txbuf
.len
/ 2;
270 txbuf16
= par
->txbuf
.buf
+ 1;
272 *(u8
*)(par
->txbuf
.buf
) = 0x00;
276 to_copy
= min(tx_array_size
, remain
);
277 dev_dbg(par
->info
->device
, " to_copy=%zu, remain=%zu\n",
278 to_copy
, remain
- to_copy
);
280 for (i
= 0; i
< to_copy
; i
++)
281 txbuf16
[i
] = cpu_to_be16(vmem16
[i
]);
283 vmem16
= vmem16
+ to_copy
;
284 ret
= par
->fbtftops
.write(par
, par
->txbuf
.buf
,
285 startbyte_size
+ to_copy
* 2);
294 static struct fbtft_display display
= {
297 .init_display
= init_display
,
298 .set_addr_win
= set_addr_win
,
299 .write_register
= write_reg8_bus8
,
300 .write_vmem
= write_vmem16_bus8
,
305 FBTFT_REGISTER_DRIVER(DRVNAME
, "raio,ra8875", &display
);
307 MODULE_ALIAS("spi:" DRVNAME
);
308 MODULE_ALIAS("platform:" DRVNAME
);
309 MODULE_ALIAS("spi:ra8875");
310 MODULE_ALIAS("platform:ra8875");
312 MODULE_DESCRIPTION("FB driver for the RA8875 LCD Controller");
313 MODULE_AUTHOR("Pf@nne");
314 MODULE_LICENSE("GPL");