/*
* Epson HWA742 LCD controller driver
*
* Copyright (C) 2004-2005 Nokia Corporation
* Authors: Juha Yrjölä <juha.yrjola@nokia.com>
* Imre Deak <imre.deak@nokia.com>
* YUV support: Jussi Laako <jussi.laako@nokia.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/interrupt.h>
#include "omapfb.h"
#define HWA742_REV_CODE_REG 0x0
#define HWA742_CONFIG_REG 0x2
#define HWA742_PLL_DIV_REG 0x4
#define HWA742_PLL_0_REG 0x6
#define HWA742_PLL_1_REG 0x8
#define HWA742_PLL_2_REG 0xa
#define HWA742_PLL_3_REG 0xc
#define HWA742_PLL_4_REG 0xe
#define HWA742_CLK_SRC_REG 0x12
#define HWA742_PANEL_TYPE_REG 0x14
#define HWA742_H_DISP_REG 0x16
#define HWA742_H_NDP_REG 0x18
#define HWA742_V_DISP_1_REG 0x1a
#define HWA742_V_DISP_2_REG 0x1c
#define HWA742_V_NDP_REG 0x1e
#define HWA742_HS_W_REG 0x20
#define HWA742_HP_S_REG 0x22
#define HWA742_VS_W_REG 0x24
#define HWA742_VP_S_REG 0x26
#define HWA742_PCLK_POL_REG 0x28
#define HWA742_INPUT_MODE_REG 0x2a
#define HWA742_TRANSL_MODE_REG1 0x2e
#define HWA742_DISP_MODE_REG 0x34
#define HWA742_WINDOW_TYPE 0x36
#define HWA742_WINDOW_X_START_0 0x38
#define HWA742_WINDOW_X_START_1 0x3a
#define HWA742_WINDOW_Y_START_0 0x3c
#define HWA742_WINDOW_Y_START_1 0x3e
#define HWA742_WINDOW_X_END_0 0x40
#define HWA742_WINDOW_X_END_1 0x42
#define HWA742_WINDOW_Y_END_0 0x44
#define HWA742_WINDOW_Y_END_1 0x46
#define HWA742_MEMORY_WRITE_LSB 0x48
#define HWA742_MEMORY_WRITE_MSB 0x49
#define HWA742_MEMORY_READ_0 0x4a
#define HWA742_MEMORY_READ_1 0x4c
#define HWA742_MEMORY_READ_2 0x4e
#define HWA742_POWER_SAVE 0x56
#define HWA742_NDP_CTRL 0x58
#define HWA742_AUTO_UPDATE_TIME (HZ / 20)
/* Reserve 4 request slots for requests in irq context */
#define REQ_POOL_SIZE 24
#define IRQ_REQ_POOL_SIZE 4
#define REQ_FROM_IRQ_POOL 0x01
#define REQ_COMPLETE 0
#define REQ_PENDING 1
struct update_param {
int x, y, width, height;
int color_mode;
int flags;
};
struct hwa742_request {
struct list_head entry;
unsigned int flags;
int (*handler)(struct hwa742_request *req);
void (*complete)(void *data);
void *complete_data;
union {
struct update_param update;
struct completion *sync;
} par;
};
struct {
enum omapfb_update_mode update_mode;
enum omapfb_update_mode update_mode_before_suspend;
struct timer_list auto_update_timer;
int stop_auto_update;
struct omapfb_update_window auto_update_window;
unsigned te_connected:1;
unsigned vsync_only:1;
struct hwa742_request req_pool[REQ_POOL_SIZE];
struct list_head pending_req_list;
struct list_head free_req_list;
struct semaphore req_sema;
spinlock_t req_lock;
struct extif_timings reg_timings, lut_timings;
int prev_color_mode;
int prev_flags;
int window_type;
u32 max_transmit_size;
u32 extif_clk_period;
unsigned long pix_tx_time;
unsigned long line_upd_time;
struct omapfb_device *fbdev;
struct lcd_ctrl_extif *extif;
const struct lcd_ctrl *int_ctrl;
struct clk *sys_ck;
} hwa742;
struct lcd_ctrl hwa742_ctrl;
static u8 hwa742_read_reg(u8 reg)
{
u8 data;
hwa742.extif->set_bits_per_cycle(8);
hwa742.extif->write_command(®, 1);
hwa742.extif->read_data(&data, 1);
return data;
}
static void hwa742_write_reg(u8 reg, u8 data)
{
hwa742.extif->set_bits_per_cycle(8);
hwa742.extif->write_command(®, 1);
hwa742.extif->write_data(&data, 1);
}
static void set_window_regs(int x_start, int y_start, int x_end, int y_end)
{
u8 tmp[8];
u8 cmd;
x_end--;
y_end--;
tmp[0] = x_start;
tmp[1] = x_start >> 8;
tmp[2] = y_start;
tmp[3] = y_start >> 8;
tmp[4] = x_end;
tmp[5] = x_end >> 8;
tmp[6] = y_end;
tmp[7] = y_end >> 8;
hwa742.extif->set_bits_per_cycle(8);
cmd = HWA742_WINDOW_X_START_0;
hwa742.extif->write_command(&cmd, 1);
hwa742.extif->write_data(tmp, 8);
}
static void set_format_regs(int conv, int transl, int flags)
{
if (flags & OMAPFB_FORMAT_FLAG_DOUBLE) {
hwa742.window_type = ((hwa742.window_type & 0xfc) | 0x01);
#ifdef VERBOSE
dev_dbg(hwa742.fbdev->dev, "hwa742: enabled pixel doubling\n");
#endif
} else {
hwa742.window_type = (hwa742.window_type & 0xfc);
#ifdef VERBOSE
dev_dbg(hwa742.fbdev->dev, "hwa742: disabled pixel doubling\n");
#endif
}
hwa742_write_reg(HWA742_INPUT_MODE_REG, conv);
hwa742_write_reg(HWA742_TRANSL_MODE_REG1, transl);
hwa742_write_reg(HWA742_WINDOW_TYPE, hwa742.window_type);
}
static void enable_tearsync(int y, int width, int height, int screen_height,
int force_vsync)
{
u8 b;
b = hwa742_read_reg(HWA742_NDP_CTRL);
b |= 1 << 2;
hwa742_write_reg(HWA742_NDP_CTRL, b);
if (likely(hwa742.vsync_only || force_vsync)) {
hwa742.extif->enable_tearsync(1, 0);
return;
}
if (width * hwa742.pix_tx_time < hwa742.line_upd_time) {
hwa742.extif->enable_tearsync(1, 0);
return;
}
if ((width * hwa742.pix_tx_time / 1000) * height <
(y + height) * (hwa742.line_upd_time / 1000)) {
hwa742.extif->enable_tearsync(1, 0);
return;
}
hwa742.extif->enable_tearsync(1, y + 1);
}
static void disable_tearsync(void)
{
u8 b;
hwa742.extif->enable_tearsync(0, 0);
b = hwa742_read_reg(HWA742_NDP_CTRL);
b &= ~(1 << 2);
hwa742_write_reg(HWA742_NDP_CTRL, b);
}
static inline struct hwa742_request *alloc_req(void)
{
unsigned long flags;
struct hwa742_request *req;
int req_flags = 0;
if (!in_interrupt())
down(&hwa742.req_sema);
else
req_flags = REQ_FROM_IRQ_POOL;
spin_lock_irqsave(&hwa742.req_lock, flags);
BUG_ON(list_empty(&hwa742.free_req_list));
req = list_entry(hwa742.free_req_list.next,
struct hwa742_request, entry);
list_del(&req->entry);
spin_unlock_irqrestore(&hwa742.req_lock, flags);
INIT_LIST_HEAD(&req->entry);
req->flags = req_flags;
return req;
}
static inline void free_req(struct hwa742_request *req)
{
unsigned long flags;
spin_lock_irqsave(&hwa742.req_lock, flags);
list_move(&req->entry, &hwa742.free_req_list);
if (!(req->flags & REQ_FROM_IRQ_POOL))
up(&hwa742.req_sema);
spin_unlock_irqrestore(&hwa742.req_lock, flags);
}
static void process_pending_requests(void)
{
unsigned long flags;
spin_lock_irqsave(&hwa742.req_lock, flags);
while (!list_empty(&hwa742.pending_req_list)) {
struct hwa742_request *req;
void (*complete)(void *);
void *complete_data;
req = list_entry(hwa742.pending_req_list.next,
struct hwa742_request, entry);
spin_unlock_irqrestore(&hwa742.req_lock, flags);
if (req->handler(req) == REQ_PENDING)
return;
complete = req->complete;
complete_data = req->complete_data;
free_req(req);
if (complete)
complete(complete_data);
spin_lock_irqsave(&hwa742.req_lock, flags);
}
spin_unlock_irqrestore(&hwa742.req_lock, flags);
}
static void submit_req_list(struct list_head *head)
{
unsigned long flags;
int process = 1;
spin_lock_irqsave(&hwa742.req_lock, flags);
if (likely(!list_empty(&hwa742.pending_req_list)))
process = 0;
list_splice_init(head, hwa742.pending_req_list.prev);
spin_unlock_irqrestore(&hwa742.req_lock, flags);
if (process)
process_pending_requests();
}
static void request_complete(void *data)
{
struct hwa742_request *req = (struct hwa742_request *)data;
void (*complete)(void *);
void *complete_data;
complete = req->complete;
complete_data = req->complete_data;
free_req(req);
if (complete)
complete(complete_data);
process_pending_requests();
}
static int send_frame_handler(struct hwa742_request *req)
{
struct update_param *par = &req->par.update;
int x = par->x;
int y = par->y;
int w = par->width;
int h = par->height;
int bpp;
int conv, transl;
unsigned long offset;
int color_mode = par->color_mode;
int flags = par->flags;
int scr_width = hwa742.fbdev->panel->x_res;
int scr_height = hwa742.fbdev->panel->y_res;
#ifdef VERBOSE
dev_dbg(hwa742.fbdev->dev, "x %d y %d w %d h %d scr_width %d "
"color_mode %d flags %d\n",
x, y, w, h, scr_width, color_mode, flags);
#endif
switch (color_mode) {
case OMAPFB_COLOR_YUV422:
bpp = 16;
conv = 0x08;
transl = 0x25;
break;
case OMAPFB_COLOR_YUV420:
bpp = 12;
conv = 0x09;
transl = 0x25;
break;
case OMAPFB_COLOR_RGB565:
bpp = 16;
conv = 0x01;
transl = 0x05;
break;
default:
return -EINVAL;
}
if (hwa742.prev_flags != flags ||
hwa742.prev_color_mode != color_mode) {
set_format_regs(conv, transl, flags);
hwa742.prev_color_mode = color_mode;
hwa742.prev_flags = flags;
}
flags = req->par.update.flags;
if (flags & OMAPFB_FORMAT_FLAG_TEARSYNC)
enable_tearsync(y, scr_width, h, scr_height,
flags & OMAPFB_FORMAT_FLAG_FORCE_VSYNC);
else
disable_tearsync();
set_window_regs(x, y, x + w, y + h);
offset = (scr_width * y + x) * bpp / 8;
hwa742.int_ctrl->setup_plane(OMAPFB_PLANE_GFX,
OMAPFB_CHANNEL_OUT_LCD, offset, scr_width, 0, 0, w, h,
color_mode);
hwa742.extif->set_bits_per_cycle(16);
hwa742.int_ctrl->enable_plane(OMAPFB_PLANE_GFX, 1);
hwa742.extif->transfer_area(w, h, request_complete, req);
return REQ_PENDING;
}
static void send_frame_complete(void *data)
{
hwa742.int_ctrl->enable_plane(OMAPFB_PLANE_GFX, 0);
}
#define ADD_PREQ(_x, _y, _w, _h) do { \
req = alloc_req(); \
req->handler = send_frame_handler; \
req->complete = send_frame_complete; \
req->par.update.x = _x; \
req->par.update.y = _y; \
req->par.update.width = _w; \
req->par.update.height = _h; \
req->par.update.color_mode = color_mode;\
req->par.update.flags = flags; \
list_add_tail(&req->entry, req_head); \
} while(0)
static void create_req_list(struct omapfb_update_window *win,
struct list_head *req_head)
{
struct hwa742_request *req;
int x = win->x;
int y = win->y;
int width = win->width;
int height = win->height;
int color_mode;
int flags;
flags = win->format & ~OMAPFB_FORMAT_MASK;
color_mode = win->format & OMAPFB_FORMAT_MASK;
if (x & 1) {
ADD_PREQ(x, y, 1, height);
width--;
x++;
flags &= ~OMAPFB_FORMAT_FLAG_TEARSYNC;
}
if (width & ~1) {
unsigned int xspan = width & ~1;
unsigned int ystart = y;
unsigned int yspan = height;
if (xspan * height * 2 > hwa742.max_transmit_size) {
yspan = hwa742.max_transmit_size / (xspan * 2);
ADD_PREQ(x, ystart, xspan, yspan);
ystart += yspan;
yspan = height - yspan;
flags &= ~OMAPFB_FORMAT_FLAG_TEARSYNC;
}
ADD_PREQ(x, ystart, xspan, yspan);
x += xspan;
width -= xspan;
flags &= ~OMAPFB_FORMAT_FLAG_TEARSYNC;
}
if (width)
ADD_PREQ(x, y, 1, height);
}
static void auto_update_complete(void *data)
{
if (!hwa742.stop_auto_update)
mod_timer(&hwa742.auto_update_timer,
jiffies + HWA742_AUTO_UPDATE_TIME);
}
static void hwa742_update_window_auto(unsigned long arg)
{
LIST_HEAD(req_list);
struct hwa742_request *last;
create_req_list(&hwa742.auto_update_window, &req_list);
last = list_entry(req_list.prev, struct hwa742_request, entry);
last->complete = auto_update_complete;
last->complete_data = NULL;
submit_req_list(&req_list);
}
int hwa742_update_window_async(struct fb_info *fbi,
struct omapfb_update_window *win,
void (*complete_callback)(void *arg),
void *complete_callback_data)
{
LIST_HEAD(req_list);
struct hwa742_request *last;
int r = 0;
if (hwa742.update_mode != OMAPFB_MANUAL_UPDATE) {
dev_dbg(hwa742.fbdev->dev, "invalid update mode\n");
r = -EINVAL;
goto out;
}
if (unlikely(win->format &
~(0x03 | OMAPFB_FORMAT_FLAG_DOUBLE |
OMAPFB_FORMAT_FLAG_TEARSYNC | OMAPFB_FORMAT_FLAG_FORCE_VSYNC))) {
dev_dbg(hwa742.fbdev->dev, "invalid window flag\n");
r = -EINVAL;
goto out;
}
create_req_list(win, &req_list);
last = list_entry(req_list.prev, struct hwa742_request, entry);
last->complete = complete_callback;
last->complete_data = (void *)complete_callback_data;
submit_req_list(&req_list);
out:
return r;
}
EXPORT_SYMBOL(hwa742_update_window_async);
static int hwa742_setup_plane(int plane, int channel_out,
unsigned long offset, int screen_width,
int pos_x, int pos_y, int width, int height,
int color_mode)
{
if (plane != OMAPFB_PLANE_GFX ||
channel_out != OMAPFB_CHANNEL_OUT_LCD)
return -EINVAL;
return 0;
}
static int hwa742_enable_plane(int plane, int enable)
{
if (plane != 0)
return -EINVAL;
hwa742.int_ctrl->enable_plane(plane, enable);
return 0;
}
static int sync_handler(struct hwa742_request *req)
{
complete(req->par.sync);
return REQ_COMPLETE;
}
static void hwa742_sync(void)
{
LIST_HEAD(req_list);
struct hwa742_request *req;
struct completion comp;
req = alloc_req();
req->handler = sync_handler;
req->complete = NULL;
init_completion(&comp);
req->par.sync = ∁
list_add(&req->entry, &req_list);
submit_req_list(&req_list);
wait_for_completion(&comp);
}
static void hwa742_bind_client(struct omapfb_notifier_block *nb)
{
dev_dbg(hwa742.fbdev->dev, "update_mode %d\n", hwa742.update_mode);
if (hwa742.update_mode == OMAPFB_MANUAL_UPDATE) {
omapfb_notify_clients(hwa742.fbdev, OMAPFB_EVENT_READY);
}
}
static int hwa742_set_update_mode(enum omapfb_update_mode mode)
{
if (mode != OMAPFB_MANUAL_UPDATE && mode != OMAPFB_AUTO_UPDATE &&
mode != OMAPFB_UPDATE_DISABLED)
return -EINVAL;
if (mode == hwa742.update_mode)
return 0;
dev_info(hwa742.fbdev->dev, "HWA742: setting update mode to %s\n",
mode == OMAPFB_UPDATE_DISABLED ? "disabled" :
(mode == OMAPFB_AUTO_UPDATE ? "auto" : "manual"));
switch (hwa742.update_mode) {
case OMAPFB_MANUAL_UPDATE:
omapfb_notify_clients(hwa742.fbdev, OMAPFB_EVENT_DISABLED);
break;
case OMAPFB_AUTO_UPDATE:
hwa742.stop_auto_update = 1;
del_timer_sync(&hwa742.auto_update_timer);
break;
case OMAPFB_UPDATE_DISABLED:
break;
}
hwa742.update_mode = mode;
hwa742_sync();
hwa742.stop_auto_update = 0;
switch (mode) {
case OMAPFB_MANUAL_UPDATE:
omapfb_notify_clients(hwa742.fbdev, OMAPFB_EVENT_READY);
break;
case OMAPFB_AUTO_UPDATE:
hwa742_update_window_auto(0);
break;
case OMAPFB_UPDATE_DISABLED:
break;
}
return 0;
}
static enum omapfb_update_mode hwa742_get_update_mode(void)
{
return hwa742.update_mode;
}
static unsigned long round_to_extif_ticks(unsigned long ps, int div)
{
int bus_tick = hwa742.extif_clk_period * div;
return (ps + bus_tick - 1) / bus_tick * bus_tick;
}
static int calc_reg_timing(unsigned long sysclk, int div)
{
struct extif_timings *t;
unsigned long systim;
/* CSOnTime 0, WEOnTime 2 ns, REOnTime 2 ns,
* AccessTime 2 ns + 12.2 ns (regs),
* WEOffTime = WEOnTime + 1 ns,
* REOffTime = REOnTime + 16 ns (regs),
* CSOffTime = REOffTime + 1 ns
* ReadCycle = 2ns + 2*SYSCLK (regs),
* WriteCycle = 2*SYSCLK + 2 ns,
* CSPulseWidth = 10 ns */
systim = 1000000000 / (sysclk / 1000);
dev_dbg(hwa742.fbdev->dev, "HWA742 systim %lu ps extif_clk_period %u ps"
"extif_clk_div %d\n", systim, hwa742.extif_clk_period, div);
t = &hwa742.reg_timings;
memset(t, 0, sizeof(*t));
t->clk_div = div;
t->cs_on_time = 0;
t->we_on_time = round_to_extif_ticks(t->cs_on_time + 2000, div);
t->re_on_time = round_to_extif_ticks(t->cs_on_time + 2000, div);
t->access_time = round_to_extif_ticks(t->re_on_time + 12200, div);
t->we_off_time = round_to_extif_ticks(t->we_on_time + 1000, div);
t->re_off_time = round_to_extif_ticks(t->re_on_time + 16000, div);
t->cs_off_time = round_to_extif_ticks(t->re_off_time + 1000, div);
t->we_cycle_time = round_to_extif_ticks(2 * systim + 2000, div);
if (t->we_cycle_time < t->we_off_time)
t->we_cycle_time = t->we_off_time;
t->re_cycle_time = round_to_extif_ticks(2 * systim + 2000, div);
if (t->re_cycle_time < t->re_off_time)
t->re_cycle_time = t->re_off_time;
t->cs_pulse_width = 0;
dev_dbg(hwa742.fbdev->dev, "[reg]cson %d csoff %d reon %d reoff %d\n",
t->cs_on_time, t->cs_off_time, t->re_on_time, t->re_off_time);
dev_dbg(hwa742.fbdev->dev, "[reg]weon %d weoff %d recyc %d wecyc %d\n",
t->we_on_time, t->we_off_time, t->re_cycle_time,
t->we_cycle_time);
dev_dbg(hwa742.fbdev->dev, "[reg]rdaccess %d cspulse %d\n",
t->access_time, t->cs_pulse_width);
return hwa742.extif->convert_timings(t);
}
static int calc_lut_timing(unsigned long sysclk, int div)
{
struct extif_timings *t;
unsigned long systim;
/* CSOnTime 0, WEOnTime 2 ns, REOnTime 2 ns,
* AccessTime 2 ns + 4 * SYSCLK + 26 (lut),
* WEOffTime = WEOnTime + 1 ns,
* REOffTime = REOnTime + 4*SYSCLK + 26 ns (lut),
* CSOffTime = REOffTime + 1 ns
* ReadCycle = 2ns + 4*SYSCLK + 26 ns (lut),
* WriteCycle = 2*SYSCLK + 2 ns,
* CSPulseWidth = 10 ns
*/
systim = 1000000000 / (sysclk / 1000);
dev_dbg(hwa742.fbdev->dev, "HWA742 systim %lu ps extif_clk_period %u ps"
"extif_clk_div %d\n", systim, hwa742.extif_clk_period, div);
t = &hwa742.lut_timings;
memset(t, 0, sizeof(*t));
t->clk_div = div;
t->cs_on_time = 0;
t->we_on_time = round_to_extif_ticks(t->cs_on_time + 2000, div);
t->re_on_time = round_to_extif_ticks(t->cs_on_time + 2000, div);
t->access_time = round_to_extif_ticks(t->re_on_time + 4 * systim +
26000, div);
t->we_off_time = round_to_extif_ticks(t->we_on_time + 1000, div);
t->re_off_time = round_to_extif_ticks(t->re_on_time + 4 * systim +
26000, div);
t->cs_off_time = round_to_extif_ticks(t->re_off_time + 1000, div);
t->we_cycle_time = round_to_extif_ticks(2 * systim + 2000, div);
if (t->we_cycle_time < t->we_off_time)
t->we_cycle_time = t->we_off_time;
t->re_cycle_time = round_to_extif_ticks(2000 + 4 * systim + 26000, div);
if (t->re_cycle_time < t->re_off_time)
t->re_cycle_time = t->re_off_time;
t->cs_pulse_width = 0;
dev_dbg(hwa742.fbdev->dev, "[lut]cson %d csoff %d reon %d reoff %d\n",
t->cs_on_time, t->cs_off_time, t->re_on_time, t->re_off_time);
dev_dbg(hwa742.fbdev->dev, "[lut]weon %d weoff %d recyc %d wecyc %d\n",
t->we_on_time, t->we_off_time, t->re_cycle_time,
t->we_cycle_time);
dev_dbg(hwa742.fbdev->dev, "[lut]rdaccess %d cspulse %d\n",
t->access_time, t->cs_pulse_width);
return hwa742.extif->convert_timings(t);
}
static int calc_extif_timings(unsigned long sysclk, int *extif_mem_div)
{
int max_clk_div;
int div;
hwa742.extif->get_clk_info(&hwa742.extif_clk_period, &max_clk_div);
for (div = 1; div < max_clk_div; div++) {
if (calc_reg_timing(sysclk, div) == 0)
break;
}
if (div >= max_clk_div)
goto err;
*extif_mem_div = div;
for (div = 1; div < max_clk_div; div++) {
if (calc_lut_timing(sysclk, div) == 0)
break;
}
if (div >= max_clk_div)
goto err;
return 0;
err:
dev_err(hwa742.fbdev->dev, "can't setup timings\n");
return -1;
}
static void calc_hwa742_clk_rates(unsigned long ext_clk,
unsigned long *sys_clk, unsigned long *pix_clk)
{
int pix_clk_src;
int sys_div = 0, sys_mul = 0;
int pix_div;
pix_clk_src = hwa742_read_reg(HWA742_CLK_SRC_REG);
pix_div = ((pix_clk_src >> 3) & 0x1f) + 1;
if ((pix_clk_src & (0x3 << 1)) == 0) {
/* Source is the PLL */
sys_div = (hwa742_read_reg(HWA742_PLL_DIV_REG) & 0x3f) + 1;
sys_mul = (hwa742_read_reg(HWA742_PLL_4_REG) & 0x7f) + 1;
*sys_clk = ext_clk * sys_mul / sys_div;
} else /* else source is ext clk, or oscillator */
*sys_clk = ext_clk;
*pix_clk = *sys_clk / pix_div; /* HZ */
dev_dbg(hwa742.fbdev->dev,
"ext_clk %ld pix_src %d pix_div %d sys_div %d sys_mul %d\n",
ext_clk, pix_clk_src & (0x3 << 1), pix_div, sys_div, sys_mul);
dev_dbg(hwa742.fbdev->dev, "sys_clk %ld pix_clk %ld\n",
*sys_clk, *pix_clk);
}
static int setup_tearsync(unsigned long pix_clk, int extif_div)
{
int hdisp, vdisp;
int hndp, vndp;
int hsw, vsw;
int hs, vs;
int hs_pol_inv, vs_pol_inv;
int use_hsvs, use_ndp;
u8 b;
hsw = hwa742_read_reg(HWA742_HS_W_REG);
vsw = hwa742_read_reg(HWA742_VS_W_REG);
hs_pol_inv = !(hsw & 0x80);
vs_pol_inv = !(vsw & 0x80);
hsw = hsw & 0x7f;
vsw = vsw & 0x3f;
hdisp = (hwa742_read_reg(HWA742_H_DISP_REG) & 0x7f) * 8;
vdisp = hwa742_read_reg(HWA742_V_DISP_1_REG) +
((hwa742_read_reg(HWA742_V_DISP_2_REG) & 0x3) << 8);
hndp = hwa742_read_reg(HWA742_H_NDP_REG) & 0x7f;
vndp = hwa742_read_reg(HWA742_V_NDP_REG);
/* time to transfer one pixel (16bpp) in ps */
hwa742.pix_tx_time = hwa742.reg_timings.we_cycle_time;
if (hwa742.extif->get_max_tx_rate != NULL) {
/*
* The external interface might have a rate limitation,
* if so, we have to maximize our transfer rate.
*/
unsigned long min_tx_time;
unsigned long max_tx_rate = hwa742.extif->get_max_tx_rate();
dev_dbg(hwa742.fbdev->dev, "max_tx_rate %ld HZ\n",
max_tx_rate);
min_tx_time = 1000000000 / (max_tx_rate / 1000); /* ps */
if (hwa742.pix_tx_time < min_tx_time)
hwa742.pix_tx_time = min_tx_time;
}
/* time to update one line in ps */
hwa742.line_upd_time = (hdisp + hndp) * 1000000 / (pix_clk / 1000);
hwa742.line_upd_time *= 1000;
if (hdisp * hwa742.pix_tx_time > hwa742.line_upd_time)
/*
* transfer speed too low, we might have to use both
* HS and VS
*/
use_hsvs = 1;
else
/* decent transfer speed, we'll always use only VS */
use_hsvs = 0;
if (use_hsvs && (hs_pol_inv || vs_pol_inv)) {
/*
* HS or'ed with VS doesn't work, use the active high
* TE signal based on HNDP / VNDP
*/
use_ndp = 1;
hs_pol_inv = 0;
vs_pol_inv = 0;
hs = hndp;
vs = vndp;
} else {
/*
* Use HS or'ed with VS as a TE signal if both are needed
* or VNDP if only vsync is needed.
*/
use_ndp = 0;
hs = hsw;
vs = vsw;
if (!use_hsvs) {
hs_pol_inv = 0;
vs_pol_inv = 0;
}
}
hs = hs * 1000000 / (pix_clk / 1000); /* ps */
hs *= 1000;
vs = vs * (hdisp + hndp) * 1000000 / (pix_clk / 1000); /* ps */
vs *= 1000;
if (vs <= hs)
return -EDOM;
/* set VS to 120% of HS to minimize VS detection time */
vs = hs * 12 / 10;
/* minimize HS too */
hs = 10000;
b = hwa742_read_reg(HWA742_NDP_CTRL);
b &= ~0x3;
b |= use_hsvs ? 1 : 0;
b |= (use_ndp && use_hsvs) ? 0 : 2;
hwa742_write_reg(HWA742_NDP_CTRL, b);
hwa742.vsync_only = !use_hsvs;
dev_dbg(hwa742.fbdev->dev,
"pix_clk %ld HZ pix_tx_time %ld ps line_upd_time %ld ps\n",
pix_clk, hwa742.pix_tx_time, hwa742.line_upd_time);
dev_dbg(hwa742.fbdev->dev,
"hs %d ps vs %d ps mode %d vsync_only %d\n",
hs, vs, (b & 0x3), !use_hsvs);
return hwa742.extif->setup_tearsync(1, hs, vs,
hs_pol_inv, vs_pol_inv, extif_div);
}
static void hwa742_get_caps(int plane, struct omapfb_caps *caps)
{
hwa742.int_ctrl->get_caps(plane, caps);
caps->ctrl |= OMAPFB_CAPS_MANUAL_UPDATE |
OMAPFB_CAPS_WINDOW_PIXEL_DOUBLE;
if (hwa742.te_connected)
caps->ctrl |= OMAPFB_CAPS_TEARSYNC;
caps->wnd_color |= (1 << OMAPFB_COLOR_RGB565) |
(1 << OMAPFB_COLOR_YUV420);
}
static void hwa742_suspend(void)
{
hwa742.update_mode_before_suspend = hwa742.update_mode;
hwa742_set_update_mode(OMAPFB_UPDATE_DISABLED);
/* Enable sleep mode */
hwa742_write_reg(HWA742_POWER_SAVE, 1 << 1);
clk_disable(hwa742.sys_ck);
}
static void hwa742_resume(void)
{
clk_enable(hwa742.sys_ck);
/* Disable sleep mode */
hwa742_write_reg(HWA742_POWER_SAVE, 0);
while (1) {
/* Loop until PLL output is stabilized */
if (hwa742_read_reg(HWA742_PLL_DIV_REG) & (1 << 7))
break;
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(msecs_to_jiffies(5));
}
hwa742_set_update_mode(hwa742.update_mode_before_suspend);
}
static int hwa742_init(struct omapfb_device *fbdev, int ext_mode,
struct omapfb_mem_desc *req_vram)
{
int r = 0, i;
u8 rev, conf;
unsigned long ext_clk;
unsigned long sys_clk, pix_clk;
int extif_mem_div;
struct omapfb_platform_data *omapfb_conf;
BUG_ON(!fbdev->ext_if || !fbdev->int_ctrl);
hwa742.fbdev = fbdev;
hwa742.extif = fbdev->ext_if;
hwa742.int_ctrl = fbdev->int_ctrl;
omapfb_conf = dev_get_platdata(fbdev->dev);
hwa742.sys_ck = clk_get(NULL, "hwa_sys_ck");
spin_lock_init(&hwa742.req_lock);
if ((r = hwa742.int_ctrl->init(fbdev, 1, req_vram)) < 0)
goto err1;
if ((r = hwa742.extif->init(fbdev)) < 0)
goto err2;
ext_clk = clk_get_rate(hwa742.sys_ck);
if ((r = calc_extif_timings(ext_clk, &extif_mem_div)) < 0)
goto err3;
hwa742.extif->set_timings(&hwa742.reg_timings);
clk_enable(hwa742.sys_ck);
calc_hwa742_clk_rates(ext_clk, &sys_clk, &pix_clk);
if ((r = calc_extif_timings(sys_clk, &extif_mem_div)) < 0)
goto err4;
hwa742.extif->set_timings(&hwa742.reg_timings);
rev = hwa742_read_reg(HWA742_REV_CODE_REG);
if ((rev & 0xfc) != 0x80) {
dev_err(fbdev->dev, "HWA742: invalid revision %02x\n", rev);
r = -ENODEV;
goto err4;
}
if (!(hwa742_read_reg(HWA742_PLL_DIV_REG) & 0x80)) {
dev_err(fbdev->dev,
"HWA742: controller not initialized by the bootloader\n");
r = -ENODEV;
goto err4;
}
if ((r = setup_tearsync(pix_clk, extif_mem_div)) < 0) {
dev_err(hwa742.fbdev->dev,
"HWA742: can't setup tearing synchronization\n");
goto err4;
}
hwa742.te_connected = 1;
hwa742.max_transmit_size = hwa742.extif->max_transmit_size;
hwa742.update_mode = OMAPFB_UPDATE_DISABLED;
hwa742.auto_update_window.x = 0;
hwa742.auto_update_window.y = 0;
hwa742.auto_update_window.width = fbdev->panel->x_res;
hwa742.auto_update_window.height = fbdev->panel->y_res;
hwa742.auto_update_window.format = 0;
init_timer(&hwa742.auto_update_timer);
hwa742.auto_update_timer.function = hwa742_update_window_auto;
hwa742.auto_update_timer.data = 0;
hwa742.prev_color_mode = -1;
hwa742.prev_flags = 0;
hwa742.fbdev = fbdev;
INIT_LIST_HEAD(&hwa742.free_req_list);
INIT_LIST_HEAD(&hwa742.pending_req_list);
for (i = 0; i < ARRAY_SIZE(hwa742.req_pool); i++)
list_add(&hwa742.req_pool[i].entry, &hwa742.free_req_list);
BUG_ON(i <= IRQ_REQ_POOL_SIZE);
sema_init(&hwa742.req_sema, i - IRQ_REQ_POOL_SIZE);
conf = hwa742_read_reg(HWA742_CONFIG_REG);
dev_info(fbdev->dev, ": Epson HWA742 LCD controller rev %d "
"initialized (CNF pins %x)\n", rev & 0x03, conf & 0x07);
return 0;
err4:
clk_disable(hwa742.sys_ck);
err3:
hwa742.extif->cleanup();
err2:
hwa742.int_ctrl->cleanup();
err1:
return r;
}
static void hwa742_cleanup(void)
{
hwa742_set_update_mode(OMAPFB_UPDATE_DISABLED);
hwa742.extif->cleanup();
hwa742.int_ctrl->cleanup();
clk_disable(hwa742.sys_ck);
}
struct lcd_ctrl hwa742_ctrl = {
.name = "hwa742",
.init = hwa742_init,
.cleanup = hwa742_cleanup,
.bind_client = hwa742_bind_client,
.get_caps = hwa742_get_caps,
.set_update_mode = hwa742_set_update_mode,
.get_update_mode = hwa742_get_update_mode,
.setup_plane = hwa742_setup_plane,
.enable_plane = hwa742_enable_plane,
.update_window = hwa742_update_window_async,
.sync = hwa742_sync,
.suspend = hwa742_suspend,
.resume = hwa742_resume,
};