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70f1e28e65
The controller init may be called from a context where the device is runtime suspended, leading to a deadlock, as the controllers only accepts the wakeup command when suspended. Signed-off-by: Heiko Stübner <heiko@sntech.de> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
259 lines
6.8 KiB
C
259 lines
6.8 KiB
C
/*
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* auok190xfb.c -- FB driver for AUO-K1901 controllers
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*
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* Copyright (C) 2011, 2012 Heiko Stuebner <heiko@sntech.de>
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*
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* based on broadsheetfb.c
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*
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* Copyright (C) 2008, Jaya Kumar
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
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*
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* This driver is written to be used with the AUO-K1901 display controller.
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*
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* It is intended to be architecture independent. A board specific driver
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* must be used to perform all the physical IO interactions.
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*
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* The controller supports different update modes:
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* mode0+1 16 step gray (4bit)
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* mode2+3 4 step gray (2bit)
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* mode4+5 2 step gray (1bit)
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* - mode4 is described as "without LUT"
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* mode7 automatic selection of update mode
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*
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* The most interesting difference to the K1900 is the ability to do screen
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* updates in an asynchronous fashion. Where the K1900 needs to wait for the
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* current update to complete, the K1901 can process later updates already.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/list.h>
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#include <linux/firmware.h>
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#include <linux/gpio.h>
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#include <linux/pm_runtime.h>
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#include <video/auo_k190xfb.h>
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#include "auo_k190x.h"
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/*
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* AUO-K1901 specific commands
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*/
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#define AUOK1901_CMD_LUT_INTERFACE 0x0005
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#define AUOK1901_CMD_DMA_START 0x1001
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#define AUOK1901_CMD_CURSOR_START 0x1007
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#define AUOK1901_CMD_CURSOR_STOP AUOK190X_CMD_DATA_STOP
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#define AUOK1901_CMD_DDMA_START 0x1009
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#define AUOK1901_INIT_GATE_PULSE_LOW (0 << 14)
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#define AUOK1901_INIT_GATE_PULSE_HIGH (1 << 14)
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#define AUOK1901_INIT_SINGLE_GATE (0 << 13)
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#define AUOK1901_INIT_DOUBLE_GATE (1 << 13)
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/* Bits to pixels
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* Mode 15-12 11-8 7-4 3-0
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* format2 2 T 1 T
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* format3 1 T 2 T
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* format4 T 2 T 1
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* format5 T 1 T 2
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*
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* halftone modes:
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* format6 2 2 1 1
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* format7 1 1 2 2
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*/
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#define AUOK1901_INIT_FORMAT2 (1 << 7)
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#define AUOK1901_INIT_FORMAT3 ((1 << 7) | (1 << 6))
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#define AUOK1901_INIT_FORMAT4 (1 << 8)
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#define AUOK1901_INIT_FORMAT5 ((1 << 8) | (1 << 6))
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#define AUOK1901_INIT_FORMAT6 ((1 << 8) | (1 << 7))
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#define AUOK1901_INIT_FORMAT7 ((1 << 8) | (1 << 7) | (1 << 6))
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/* res[4] to bit 10
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* res[3-0] to bits 5-2
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*/
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#define AUOK1901_INIT_RESOLUTION(_res) (((_res & (1 << 4)) << 6) \
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| ((_res & 0xf) << 2))
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/*
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* portrait / landscape orientation in AUOK1901_CMD_DMA_START
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*/
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#define AUOK1901_DMA_ROTATE90(_rot) ((_rot & 1) << 13)
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/*
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* equivalent to 1 << 11, needs the ~ to have same rotation like K1900
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*/
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#define AUOK1901_DDMA_ROTATE180(_rot) ((~_rot & 2) << 10)
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static void auok1901_init(struct auok190xfb_par *par)
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{
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struct device *dev = par->info->device;
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struct auok190x_board *board = par->board;
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u16 init_param = 0;
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pm_runtime_get_sync(dev);
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init_param |= AUOK190X_INIT_INVERSE_WHITE;
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init_param |= AUOK190X_INIT_FORMAT0;
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init_param |= AUOK1901_INIT_RESOLUTION(par->resolution);
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init_param |= AUOK190X_INIT_SHIFT_LEFT;
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auok190x_send_cmdargs(par, AUOK190X_CMD_INIT, 1, &init_param);
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/* let the controller finish */
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board->wait_for_rdy(par);
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pm_runtime_mark_last_busy(dev);
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pm_runtime_put_autosuspend(dev);
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}
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static void auok1901_update_region(struct auok190xfb_par *par, int mode,
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u16 y1, u16 y2)
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{
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struct device *dev = par->info->device;
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unsigned char *buf = (unsigned char *)par->info->screen_base;
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int xres = par->info->var.xres;
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int line_length = par->info->fix.line_length;
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u16 args[5];
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pm_runtime_get_sync(dev);
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mutex_lock(&(par->io_lock));
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/* y1 and y2 must be a multiple of 2 so drop the lowest bit */
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y1 &= 0xfffe;
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y2 &= 0xfffe;
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dev_dbg(dev, "update (x,y,w,h,mode)=(%d,%d,%d,%d,%d)\n",
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1, y1+1, xres, y2-y1, mode);
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/* K1901: first transfer the region data */
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args[0] = AUOK1901_DMA_ROTATE90(par->rotation) | 1;
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args[1] = y1 + 1;
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args[2] = xres;
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args[3] = y2 - y1;
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buf += y1 * line_length;
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auok190x_send_cmdargs_pixels_nowait(par, AUOK1901_CMD_DMA_START, 4,
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args, ((y2 - y1) * line_length)/2,
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(u16 *) buf);
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auok190x_send_command_nowait(par, AUOK190X_CMD_DATA_STOP);
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/* K1901: second tell the controller to update the region with mode */
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args[0] = mode | AUOK1901_DDMA_ROTATE180(par->rotation);
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args[1] = 1;
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args[2] = y1 + 1;
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args[3] = xres;
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args[4] = y2 - y1;
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auok190x_send_cmdargs_nowait(par, AUOK1901_CMD_DDMA_START, 5, args);
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par->update_cnt++;
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mutex_unlock(&(par->io_lock));
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pm_runtime_mark_last_busy(dev);
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pm_runtime_put_autosuspend(dev);
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}
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static void auok1901fb_dpy_update_pages(struct auok190xfb_par *par,
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u16 y1, u16 y2)
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{
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int mode;
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if (par->update_mode < 0) {
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mode = AUOK190X_UPDATE_MODE(1);
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par->last_mode = -1;
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} else {
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mode = AUOK190X_UPDATE_MODE(par->update_mode);
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par->last_mode = par->update_mode;
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}
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if (par->flash)
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mode |= AUOK190X_UPDATE_NONFLASH;
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auok1901_update_region(par, mode, y1, y2);
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}
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static void auok1901fb_dpy_update(struct auok190xfb_par *par)
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{
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int mode;
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/* When doing full updates, wait for the controller to be ready
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* This will hopefully catch some hangs of the K1901
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*/
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par->board->wait_for_rdy(par);
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if (par->update_mode < 0) {
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mode = AUOK190X_UPDATE_MODE(0);
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par->last_mode = -1;
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} else {
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mode = AUOK190X_UPDATE_MODE(par->update_mode);
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par->last_mode = par->update_mode;
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}
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if (par->flash)
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mode |= AUOK190X_UPDATE_NONFLASH;
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auok1901_update_region(par, mode, 0, par->info->var.yres);
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par->update_cnt = 0;
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}
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static bool auok1901fb_need_refresh(struct auok190xfb_par *par)
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{
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return (par->update_cnt > 10);
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}
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static int auok1901fb_probe(struct platform_device *pdev)
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{
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struct auok190x_init_data init;
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struct auok190x_board *board;
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/* pick up board specific routines */
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board = pdev->dev.platform_data;
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if (!board)
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return -EINVAL;
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/* fill temporary init struct for common init */
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init.id = "auo_k1901fb";
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init.board = board;
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init.update_partial = auok1901fb_dpy_update_pages;
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init.update_all = auok1901fb_dpy_update;
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init.need_refresh = auok1901fb_need_refresh;
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init.init = auok1901_init;
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return auok190x_common_probe(pdev, &init);
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}
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static int auok1901fb_remove(struct platform_device *pdev)
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{
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return auok190x_common_remove(pdev);
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}
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static struct platform_driver auok1901fb_driver = {
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.probe = auok1901fb_probe,
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.remove = auok1901fb_remove,
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.driver = {
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.owner = THIS_MODULE,
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.name = "auo_k1901fb",
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.pm = &auok190x_pm,
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},
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};
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module_platform_driver(auok1901fb_driver);
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MODULE_DESCRIPTION("framebuffer driver for the AUO-K1901 EPD controller");
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MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
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MODULE_LICENSE("GPL");
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