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OpenCloudOS-Kernel/drivers/video/omap2/dss/dss.c

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/*
* linux/drivers/video/omap2/dss/dss.c
*
* Copyright (C) 2009 Nokia Corporation
* Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
*
* Some code and ideas taken from drivers/video/omap/ driver
* by Imre Deak.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#define DSS_SUBSYS_NAME "DSS"
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/export.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/seq_file.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/gfp.h>
#include <linux/sizes.h>
#include <video/omapdss.h>
#include "dss.h"
#include "dss_features.h"
#define DSS_SZ_REGS SZ_512
struct dss_reg {
u16 idx;
};
#define DSS_REG(idx) ((const struct dss_reg) { idx })
#define DSS_REVISION DSS_REG(0x0000)
#define DSS_SYSCONFIG DSS_REG(0x0010)
#define DSS_SYSSTATUS DSS_REG(0x0014)
#define DSS_CONTROL DSS_REG(0x0040)
#define DSS_SDI_CONTROL DSS_REG(0x0044)
#define DSS_PLL_CONTROL DSS_REG(0x0048)
#define DSS_SDI_STATUS DSS_REG(0x005C)
#define REG_GET(idx, start, end) \
FLD_GET(dss_read_reg(idx), start, end)
#define REG_FLD_MOD(idx, val, start, end) \
dss_write_reg(idx, FLD_MOD(dss_read_reg(idx), val, start, end))
static int dss_runtime_get(void);
static void dss_runtime_put(void);
struct dss_features {
u8 fck_div_max;
u8 dss_fck_multiplier;
const char *clk_name;
int (*dpi_select_source)(enum omap_channel channel);
};
static struct {
struct platform_device *pdev;
void __iomem *base;
struct clk *dpll4_m4_ck;
struct clk *dss_clk;
unsigned long dss_clk_rate;
unsigned long cache_req_pck;
unsigned long cache_prate;
struct dss_clock_info cache_dss_cinfo;
struct dispc_clock_info cache_dispc_cinfo;
enum omap_dss_clk_source dsi_clk_source[MAX_NUM_DSI];
enum omap_dss_clk_source dispc_clk_source;
enum omap_dss_clk_source lcd_clk_source[MAX_DSS_LCD_MANAGERS];
bool ctx_valid;
u32 ctx[DSS_SZ_REGS / sizeof(u32)];
const struct dss_features *feat;
} dss;
static const char * const dss_generic_clk_source_names[] = {
[OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC] = "DSI_PLL_HSDIV_DISPC",
[OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DSI] = "DSI_PLL_HSDIV_DSI",
[OMAP_DSS_CLK_SRC_FCK] = "DSS_FCK",
[OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC] = "DSI_PLL2_HSDIV_DISPC",
[OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DSI] = "DSI_PLL2_HSDIV_DSI",
};
static inline void dss_write_reg(const struct dss_reg idx, u32 val)
{
__raw_writel(val, dss.base + idx.idx);
}
static inline u32 dss_read_reg(const struct dss_reg idx)
{
return __raw_readl(dss.base + idx.idx);
}
#define SR(reg) \
dss.ctx[(DSS_##reg).idx / sizeof(u32)] = dss_read_reg(DSS_##reg)
#define RR(reg) \
dss_write_reg(DSS_##reg, dss.ctx[(DSS_##reg).idx / sizeof(u32)])
static void dss_save_context(void)
{
DSSDBG("dss_save_context\n");
SR(CONTROL);
if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
OMAP_DISPLAY_TYPE_SDI) {
SR(SDI_CONTROL);
SR(PLL_CONTROL);
}
dss.ctx_valid = true;
DSSDBG("context saved\n");
}
static void dss_restore_context(void)
{
DSSDBG("dss_restore_context\n");
if (!dss.ctx_valid)
return;
RR(CONTROL);
if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
OMAP_DISPLAY_TYPE_SDI) {
RR(SDI_CONTROL);
RR(PLL_CONTROL);
}
DSSDBG("context restored\n");
}
#undef SR
#undef RR
int dss_get_ctx_loss_count(void)
{
struct omap_dss_board_info *board_data = dss.pdev->dev.platform_data;
int cnt;
if (!board_data->get_context_loss_count)
return -ENOENT;
cnt = board_data->get_context_loss_count(&dss.pdev->dev);
WARN_ONCE(cnt < 0, "get_context_loss_count failed: %d\n", cnt);
return cnt;
}
void dss_sdi_init(int datapairs)
{
u32 l;
BUG_ON(datapairs > 3 || datapairs < 1);
l = dss_read_reg(DSS_SDI_CONTROL);
l = FLD_MOD(l, 0xf, 19, 15); /* SDI_PDIV */
l = FLD_MOD(l, datapairs-1, 3, 2); /* SDI_PRSEL */
l = FLD_MOD(l, 2, 1, 0); /* SDI_BWSEL */
dss_write_reg(DSS_SDI_CONTROL, l);
l = dss_read_reg(DSS_PLL_CONTROL);
l = FLD_MOD(l, 0x7, 25, 22); /* SDI_PLL_FREQSEL */
l = FLD_MOD(l, 0xb, 16, 11); /* SDI_PLL_REGN */
l = FLD_MOD(l, 0xb4, 10, 1); /* SDI_PLL_REGM */
dss_write_reg(DSS_PLL_CONTROL, l);
}
int dss_sdi_enable(void)
{
unsigned long timeout;
dispc_pck_free_enable(1);
/* Reset SDI PLL */
REG_FLD_MOD(DSS_PLL_CONTROL, 1, 18, 18); /* SDI_PLL_SYSRESET */
udelay(1); /* wait 2x PCLK */
/* Lock SDI PLL */
REG_FLD_MOD(DSS_PLL_CONTROL, 1, 28, 28); /* SDI_PLL_GOBIT */
/* Waiting for PLL lock request to complete */
timeout = jiffies + msecs_to_jiffies(500);
while (dss_read_reg(DSS_SDI_STATUS) & (1 << 6)) {
if (time_after_eq(jiffies, timeout)) {
DSSERR("PLL lock request timed out\n");
goto err1;
}
}
/* Clearing PLL_GO bit */
REG_FLD_MOD(DSS_PLL_CONTROL, 0, 28, 28);
/* Waiting for PLL to lock */
timeout = jiffies + msecs_to_jiffies(500);
while (!(dss_read_reg(DSS_SDI_STATUS) & (1 << 5))) {
if (time_after_eq(jiffies, timeout)) {
DSSERR("PLL lock timed out\n");
goto err1;
}
}
dispc_lcd_enable_signal(1);
/* Waiting for SDI reset to complete */
timeout = jiffies + msecs_to_jiffies(500);
while (!(dss_read_reg(DSS_SDI_STATUS) & (1 << 2))) {
if (time_after_eq(jiffies, timeout)) {
DSSERR("SDI reset timed out\n");
goto err2;
}
}
return 0;
err2:
dispc_lcd_enable_signal(0);
err1:
/* Reset SDI PLL */
REG_FLD_MOD(DSS_PLL_CONTROL, 0, 18, 18); /* SDI_PLL_SYSRESET */
dispc_pck_free_enable(0);
return -ETIMEDOUT;
}
void dss_sdi_disable(void)
{
dispc_lcd_enable_signal(0);
dispc_pck_free_enable(0);
/* Reset SDI PLL */
REG_FLD_MOD(DSS_PLL_CONTROL, 0, 18, 18); /* SDI_PLL_SYSRESET */
}
const char *dss_get_generic_clk_source_name(enum omap_dss_clk_source clk_src)
{
return dss_generic_clk_source_names[clk_src];
}
void dss_dump_clocks(struct seq_file *s)
{
unsigned long dpll4_ck_rate;
unsigned long dpll4_m4_ck_rate;
const char *fclk_name, *fclk_real_name;
unsigned long fclk_rate;
if (dss_runtime_get())
return;
seq_printf(s, "- DSS -\n");
fclk_name = dss_get_generic_clk_source_name(OMAP_DSS_CLK_SRC_FCK);
fclk_real_name = dss_feat_get_clk_source_name(OMAP_DSS_CLK_SRC_FCK);
fclk_rate = clk_get_rate(dss.dss_clk);
if (dss.dpll4_m4_ck) {
dpll4_ck_rate = clk_get_rate(clk_get_parent(dss.dpll4_m4_ck));
dpll4_m4_ck_rate = clk_get_rate(dss.dpll4_m4_ck);
seq_printf(s, "dpll4_ck %lu\n", dpll4_ck_rate);
seq_printf(s, "%s (%s) = %lu / %lu * %d = %lu\n",
fclk_name, fclk_real_name, dpll4_ck_rate,
dpll4_ck_rate / dpll4_m4_ck_rate,
dss.feat->dss_fck_multiplier, fclk_rate);
} else {
seq_printf(s, "%s (%s) = %lu\n",
fclk_name, fclk_real_name,
fclk_rate);
}
dss_runtime_put();
}
static void dss_dump_regs(struct seq_file *s)
{
#define DUMPREG(r) seq_printf(s, "%-35s %08x\n", #r, dss_read_reg(r))
if (dss_runtime_get())
return;
DUMPREG(DSS_REVISION);
DUMPREG(DSS_SYSCONFIG);
DUMPREG(DSS_SYSSTATUS);
DUMPREG(DSS_CONTROL);
if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
OMAP_DISPLAY_TYPE_SDI) {
DUMPREG(DSS_SDI_CONTROL);
DUMPREG(DSS_PLL_CONTROL);
DUMPREG(DSS_SDI_STATUS);
}
dss_runtime_put();
#undef DUMPREG
}
static void dss_select_dispc_clk_source(enum omap_dss_clk_source clk_src)
{
struct platform_device *dsidev;
int b;
u8 start, end;
switch (clk_src) {
case OMAP_DSS_CLK_SRC_FCK:
b = 0;
break;
case OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC:
b = 1;
dsidev = dsi_get_dsidev_from_id(0);
dsi_wait_pll_hsdiv_dispc_active(dsidev);
break;
case OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC:
b = 2;
dsidev = dsi_get_dsidev_from_id(1);
dsi_wait_pll_hsdiv_dispc_active(dsidev);
break;
default:
BUG();
return;
}
dss_feat_get_reg_field(FEAT_REG_DISPC_CLK_SWITCH, &start, &end);
REG_FLD_MOD(DSS_CONTROL, b, start, end); /* DISPC_CLK_SWITCH */
dss.dispc_clk_source = clk_src;
}
void dss_select_dsi_clk_source(int dsi_module,
enum omap_dss_clk_source clk_src)
{
struct platform_device *dsidev;
int b, pos;
switch (clk_src) {
case OMAP_DSS_CLK_SRC_FCK:
b = 0;
break;
case OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DSI:
BUG_ON(dsi_module != 0);
b = 1;
dsidev = dsi_get_dsidev_from_id(0);
dsi_wait_pll_hsdiv_dsi_active(dsidev);
break;
case OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DSI:
BUG_ON(dsi_module != 1);
b = 1;
dsidev = dsi_get_dsidev_from_id(1);
dsi_wait_pll_hsdiv_dsi_active(dsidev);
break;
default:
BUG();
return;
}
pos = dsi_module == 0 ? 1 : 10;
REG_FLD_MOD(DSS_CONTROL, b, pos, pos); /* DSIx_CLK_SWITCH */
dss.dsi_clk_source[dsi_module] = clk_src;
}
void dss_select_lcd_clk_source(enum omap_channel channel,
enum omap_dss_clk_source clk_src)
{
struct platform_device *dsidev;
int b, ix, pos;
if (!dss_has_feature(FEAT_LCD_CLK_SRC)) {
dss_select_dispc_clk_source(clk_src);
return;
}
switch (clk_src) {
case OMAP_DSS_CLK_SRC_FCK:
b = 0;
break;
case OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC:
BUG_ON(channel != OMAP_DSS_CHANNEL_LCD);
b = 1;
dsidev = dsi_get_dsidev_from_id(0);
dsi_wait_pll_hsdiv_dispc_active(dsidev);
break;
case OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC:
BUG_ON(channel != OMAP_DSS_CHANNEL_LCD2 &&
channel != OMAP_DSS_CHANNEL_LCD3);
b = 1;
dsidev = dsi_get_dsidev_from_id(1);
dsi_wait_pll_hsdiv_dispc_active(dsidev);
break;
default:
BUG();
return;
}
pos = channel == OMAP_DSS_CHANNEL_LCD ? 0 :
(channel == OMAP_DSS_CHANNEL_LCD2 ? 12 : 19);
REG_FLD_MOD(DSS_CONTROL, b, pos, pos); /* LCDx_CLK_SWITCH */
ix = channel == OMAP_DSS_CHANNEL_LCD ? 0 :
(channel == OMAP_DSS_CHANNEL_LCD2 ? 1 : 2);
dss.lcd_clk_source[ix] = clk_src;
}
enum omap_dss_clk_source dss_get_dispc_clk_source(void)
{
return dss.dispc_clk_source;
}
enum omap_dss_clk_source dss_get_dsi_clk_source(int dsi_module)
{
return dss.dsi_clk_source[dsi_module];
}
enum omap_dss_clk_source dss_get_lcd_clk_source(enum omap_channel channel)
{
if (dss_has_feature(FEAT_LCD_CLK_SRC)) {
int ix = channel == OMAP_DSS_CHANNEL_LCD ? 0 :
(channel == OMAP_DSS_CHANNEL_LCD2 ? 1 : 2);
return dss.lcd_clk_source[ix];
} else {
/* LCD_CLK source is the same as DISPC_FCLK source for
* OMAP2 and OMAP3 */
return dss.dispc_clk_source;
}
}
/* calculate clock rates using dividers in cinfo */
int dss_calc_clock_rates(struct dss_clock_info *cinfo)
{
if (dss.dpll4_m4_ck) {
unsigned long prate;
if (cinfo->fck_div > dss.feat->fck_div_max ||
cinfo->fck_div == 0)
return -EINVAL;
prate = clk_get_rate(clk_get_parent(dss.dpll4_m4_ck));
cinfo->fck = prate / cinfo->fck_div *
dss.feat->dss_fck_multiplier;
} else {
if (cinfo->fck_div != 0)
return -EINVAL;
cinfo->fck = clk_get_rate(dss.dss_clk);
}
return 0;
}
int dss_set_clock_div(struct dss_clock_info *cinfo)
{
if (dss.dpll4_m4_ck) {
unsigned long prate;
int r;
prate = clk_get_rate(clk_get_parent(dss.dpll4_m4_ck));
DSSDBG("dpll4_m4 = %ld\n", prate);
r = clk_set_rate(dss.dpll4_m4_ck, prate / cinfo->fck_div);
if (r)
return r;
} else {
if (cinfo->fck_div != 0)
return -EINVAL;
}
dss.dss_clk_rate = clk_get_rate(dss.dss_clk);
WARN_ONCE(dss.dss_clk_rate != cinfo->fck, "clk rate mismatch");
DSSDBG("fck = %ld (%d)\n", cinfo->fck, cinfo->fck_div);
return 0;
}
unsigned long dss_get_dpll4_rate(void)
{
if (dss.dpll4_m4_ck)
return clk_get_rate(clk_get_parent(dss.dpll4_m4_ck));
else
return 0;
}
unsigned long dss_get_dispc_clk_rate(void)
{
return dss.dss_clk_rate;
}
static int dss_setup_default_clock(void)
{
unsigned long max_dss_fck, prate;
unsigned fck_div;
struct dss_clock_info dss_cinfo = { 0 };
int r;
if (dss.dpll4_m4_ck == NULL)
return 0;
max_dss_fck = dss_feat_get_param_max(FEAT_PARAM_DSS_FCK);
prate = dss_get_dpll4_rate();
fck_div = DIV_ROUND_UP(prate * dss.feat->dss_fck_multiplier,
max_dss_fck);
dss_cinfo.fck_div = fck_div;
r = dss_calc_clock_rates(&dss_cinfo);
if (r)
return r;
r = dss_set_clock_div(&dss_cinfo);
if (r)
return r;
return 0;
}
int dss_calc_clock_div(unsigned long req_pck, struct dss_clock_info *dss_cinfo,
struct dispc_clock_info *dispc_cinfo)
{
unsigned long prate;
struct dss_clock_info best_dss;
struct dispc_clock_info best_dispc;
unsigned long fck, max_dss_fck;
u16 fck_div;
int match = 0;
int min_fck_per_pck;
prate = dss_get_dpll4_rate();
max_dss_fck = dss_feat_get_param_max(FEAT_PARAM_DSS_FCK);
fck = clk_get_rate(dss.dss_clk);
if (req_pck == dss.cache_req_pck && prate == dss.cache_prate &&
dss.cache_dss_cinfo.fck == fck) {
DSSDBG("dispc clock info found from cache.\n");
*dss_cinfo = dss.cache_dss_cinfo;
*dispc_cinfo = dss.cache_dispc_cinfo;
return 0;
}
min_fck_per_pck = CONFIG_OMAP2_DSS_MIN_FCK_PER_PCK;
if (min_fck_per_pck &&
req_pck * min_fck_per_pck > max_dss_fck) {
DSSERR("Requested pixel clock not possible with the current "
"OMAP2_DSS_MIN_FCK_PER_PCK setting. Turning "
"the constraint off.\n");
min_fck_per_pck = 0;
}
retry:
memset(&best_dss, 0, sizeof(best_dss));
memset(&best_dispc, 0, sizeof(best_dispc));
if (dss.dpll4_m4_ck == NULL) {
struct dispc_clock_info cur_dispc;
/* XXX can we change the clock on omap2? */
fck = clk_get_rate(dss.dss_clk);
fck_div = 1;
dispc_find_clk_divs(req_pck, fck, &cur_dispc);
match = 1;
best_dss.fck = fck;
best_dss.fck_div = fck_div;
best_dispc = cur_dispc;
goto found;
} else {
for (fck_div = dss.feat->fck_div_max; fck_div > 0; --fck_div) {
struct dispc_clock_info cur_dispc;
fck = prate / fck_div * dss.feat->dss_fck_multiplier;
if (fck > max_dss_fck)
continue;
if (min_fck_per_pck &&
fck < req_pck * min_fck_per_pck)
continue;
match = 1;
dispc_find_clk_divs(req_pck, fck, &cur_dispc);
if (abs(cur_dispc.pck - req_pck) <
abs(best_dispc.pck - req_pck)) {
best_dss.fck = fck;
best_dss.fck_div = fck_div;
best_dispc = cur_dispc;
if (cur_dispc.pck == req_pck)
goto found;
}
}
}
found:
if (!match) {
if (min_fck_per_pck) {
DSSERR("Could not find suitable clock settings.\n"
"Turning FCK/PCK constraint off and"
"trying again.\n");
min_fck_per_pck = 0;
goto retry;
}
DSSERR("Could not find suitable clock settings.\n");
return -EINVAL;
}
if (dss_cinfo)
*dss_cinfo = best_dss;
if (dispc_cinfo)
*dispc_cinfo = best_dispc;
dss.cache_req_pck = req_pck;
dss.cache_prate = prate;
dss.cache_dss_cinfo = best_dss;
dss.cache_dispc_cinfo = best_dispc;
return 0;
}
void dss_set_venc_output(enum omap_dss_venc_type type)
{
int l = 0;
if (type == OMAP_DSS_VENC_TYPE_COMPOSITE)
l = 0;
else if (type == OMAP_DSS_VENC_TYPE_SVIDEO)
l = 1;
else
BUG();
/* venc out selection. 0 = comp, 1 = svideo */
REG_FLD_MOD(DSS_CONTROL, l, 6, 6);
}
void dss_set_dac_pwrdn_bgz(bool enable)
{
REG_FLD_MOD(DSS_CONTROL, enable, 5, 5); /* DAC Power-Down Control */
}
void dss_select_hdmi_venc_clk_source(enum dss_hdmi_venc_clk_source_select src)
{
enum omap_display_type dp;
dp = dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_DIGIT);
/* Complain about invalid selections */
WARN_ON((src == DSS_VENC_TV_CLK) && !(dp & OMAP_DISPLAY_TYPE_VENC));
WARN_ON((src == DSS_HDMI_M_PCLK) && !(dp & OMAP_DISPLAY_TYPE_HDMI));
/* Select only if we have options */
if ((dp & OMAP_DISPLAY_TYPE_VENC) && (dp & OMAP_DISPLAY_TYPE_HDMI))
REG_FLD_MOD(DSS_CONTROL, src, 15, 15); /* VENC_HDMI_SWITCH */
}
enum dss_hdmi_venc_clk_source_select dss_get_hdmi_venc_clk_source(void)
{
enum omap_display_type displays;
displays = dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_DIGIT);
if ((displays & OMAP_DISPLAY_TYPE_HDMI) == 0)
return DSS_VENC_TV_CLK;
if ((displays & OMAP_DISPLAY_TYPE_VENC) == 0)
return DSS_HDMI_M_PCLK;
return REG_GET(DSS_CONTROL, 15, 15);
}
static int dss_dpi_select_source_omap2_omap3(enum omap_channel channel)
{
if (channel != OMAP_DSS_CHANNEL_LCD)
return -EINVAL;
return 0;
}
static int dss_dpi_select_source_omap4(enum omap_channel channel)
{
int val;
switch (channel) {
case OMAP_DSS_CHANNEL_LCD2:
val = 0;
break;
case OMAP_DSS_CHANNEL_DIGIT:
val = 1;
break;
default:
return -EINVAL;
}
REG_FLD_MOD(DSS_CONTROL, val, 17, 17);
return 0;
}
static int dss_dpi_select_source_omap5(enum omap_channel channel)
{
int val;
switch (channel) {
case OMAP_DSS_CHANNEL_LCD:
val = 1;
break;
case OMAP_DSS_CHANNEL_LCD2:
val = 2;
break;
case OMAP_DSS_CHANNEL_LCD3:
val = 3;
break;
case OMAP_DSS_CHANNEL_DIGIT:
val = 0;
break;
default:
return -EINVAL;
}
REG_FLD_MOD(DSS_CONTROL, val, 17, 16);
return 0;
}
int dss_dpi_select_source(enum omap_channel channel)
{
return dss.feat->dpi_select_source(channel);
}
static int dss_get_clocks(void)
{
struct clk *clk;
int r;
clk = clk_get(&dss.pdev->dev, "fck");
if (IS_ERR(clk)) {
DSSERR("can't get clock fck\n");
r = PTR_ERR(clk);
goto err;
}
dss.dss_clk = clk;
if (dss.feat->clk_name) {
clk = clk_get(NULL, dss.feat->clk_name);
if (IS_ERR(clk)) {
DSSERR("Failed to get %s\n", dss.feat->clk_name);
r = PTR_ERR(clk);
goto err;
}
} else {
clk = NULL;
}
dss.dpll4_m4_ck = clk;
return 0;
err:
if (dss.dss_clk)
clk_put(dss.dss_clk);
if (dss.dpll4_m4_ck)
clk_put(dss.dpll4_m4_ck);
return r;
}
static void dss_put_clocks(void)
{
if (dss.dpll4_m4_ck)
clk_put(dss.dpll4_m4_ck);
clk_put(dss.dss_clk);
}
static int dss_runtime_get(void)
{
int r;
DSSDBG("dss_runtime_get\n");
r = pm_runtime_get_sync(&dss.pdev->dev);
WARN_ON(r < 0);
return r < 0 ? r : 0;
}
static void dss_runtime_put(void)
{
int r;
DSSDBG("dss_runtime_put\n");
r = pm_runtime_put_sync(&dss.pdev->dev);
WARN_ON(r < 0 && r != -ENOSYS && r != -EBUSY);
}
/* DEBUGFS */
#if defined(CONFIG_OMAP2_DSS_DEBUGFS)
void dss_debug_dump_clocks(struct seq_file *s)
{
dss_dump_clocks(s);
dispc_dump_clocks(s);
#ifdef CONFIG_OMAP2_DSS_DSI
dsi_dump_clocks(s);
#endif
}
#endif
static const struct dss_features omap24xx_dss_feats __initconst = {
.fck_div_max = 16,
.dss_fck_multiplier = 2,
.clk_name = NULL,
.dpi_select_source = &dss_dpi_select_source_omap2_omap3,
};
static const struct dss_features omap34xx_dss_feats __initconst = {
.fck_div_max = 16,
.dss_fck_multiplier = 2,
.clk_name = "dpll4_m4_ck",
.dpi_select_source = &dss_dpi_select_source_omap2_omap3,
};
static const struct dss_features omap3630_dss_feats __initconst = {
.fck_div_max = 32,
.dss_fck_multiplier = 1,
.clk_name = "dpll4_m4_ck",
.dpi_select_source = &dss_dpi_select_source_omap2_omap3,
};
static const struct dss_features omap44xx_dss_feats __initconst = {
.fck_div_max = 32,
.dss_fck_multiplier = 1,
.clk_name = "dpll_per_m5x2_ck",
.dpi_select_source = &dss_dpi_select_source_omap4,
};
static const struct dss_features omap54xx_dss_feats __initconst = {
.fck_div_max = 64,
.dss_fck_multiplier = 1,
.clk_name = "dpll_per_h12x2_ck",
.dpi_select_source = &dss_dpi_select_source_omap5,
};
static int __init dss_init_features(struct platform_device *pdev)
{
const struct dss_features *src;
struct dss_features *dst;
dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
if (!dst) {
dev_err(&pdev->dev, "Failed to allocate local DSS Features\n");
return -ENOMEM;
}
switch (omapdss_get_version()) {
case OMAPDSS_VER_OMAP24xx:
src = &omap24xx_dss_feats;
break;
case OMAPDSS_VER_OMAP34xx_ES1:
case OMAPDSS_VER_OMAP34xx_ES3:
case OMAPDSS_VER_AM35xx:
src = &omap34xx_dss_feats;
break;
case OMAPDSS_VER_OMAP3630:
src = &omap3630_dss_feats;
break;
case OMAPDSS_VER_OMAP4430_ES1:
case OMAPDSS_VER_OMAP4430_ES2:
case OMAPDSS_VER_OMAP4:
src = &omap44xx_dss_feats;
break;
case OMAPDSS_VER_OMAP5:
src = &omap54xx_dss_feats;
break;
default:
return -ENODEV;
}
memcpy(dst, src, sizeof(*dst));
dss.feat = dst;
return 0;
}
/* DSS HW IP initialisation */
static int __init omap_dsshw_probe(struct platform_device *pdev)
{
struct resource *dss_mem;
u32 rev;
int r;
dss.pdev = pdev;
r = dss_init_features(dss.pdev);
if (r)
return r;
dss_mem = platform_get_resource(dss.pdev, IORESOURCE_MEM, 0);
if (!dss_mem) {
DSSERR("can't get IORESOURCE_MEM DSS\n");
return -EINVAL;
}
dss.base = devm_ioremap(&pdev->dev, dss_mem->start,
resource_size(dss_mem));
if (!dss.base) {
DSSERR("can't ioremap DSS\n");
return -ENOMEM;
}
r = dss_get_clocks();
if (r)
return r;
r = dss_setup_default_clock();
if (r)
goto err_setup_clocks;
pm_runtime_enable(&pdev->dev);
r = dss_runtime_get();
if (r)
goto err_runtime_get;
dss.dss_clk_rate = clk_get_rate(dss.dss_clk);
/* Select DPLL */
REG_FLD_MOD(DSS_CONTROL, 0, 0, 0);
dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK);
#ifdef CONFIG_OMAP2_DSS_VENC
REG_FLD_MOD(DSS_CONTROL, 1, 4, 4); /* venc dac demen */
REG_FLD_MOD(DSS_CONTROL, 1, 3, 3); /* venc clock 4x enable */
REG_FLD_MOD(DSS_CONTROL, 0, 2, 2); /* venc clock mode = normal */
#endif
dss.dsi_clk_source[0] = OMAP_DSS_CLK_SRC_FCK;
dss.dsi_clk_source[1] = OMAP_DSS_CLK_SRC_FCK;
dss.dispc_clk_source = OMAP_DSS_CLK_SRC_FCK;
dss.lcd_clk_source[0] = OMAP_DSS_CLK_SRC_FCK;
dss.lcd_clk_source[1] = OMAP_DSS_CLK_SRC_FCK;
rev = dss_read_reg(DSS_REVISION);
printk(KERN_INFO "OMAP DSS rev %d.%d\n",
FLD_GET(rev, 7, 4), FLD_GET(rev, 3, 0));
dss_runtime_put();
dss_debugfs_create_file("dss", dss_dump_regs);
return 0;
err_runtime_get:
pm_runtime_disable(&pdev->dev);
err_setup_clocks:
dss_put_clocks();
return r;
}
static int __exit omap_dsshw_remove(struct platform_device *pdev)
{
pm_runtime_disable(&pdev->dev);
dss_put_clocks();
return 0;
}
static int dss_runtime_suspend(struct device *dev)
{
dss_save_context();
dss_set_min_bus_tput(dev, 0);
return 0;
}
static int dss_runtime_resume(struct device *dev)
{
int r;
/*
* Set an arbitrarily high tput request to ensure OPP100.
* What we should really do is to make a request to stay in OPP100,
* without any tput requirements, but that is not currently possible
* via the PM layer.
*/
r = dss_set_min_bus_tput(dev, 1000000000);
if (r)
return r;
dss_restore_context();
return 0;
}
static const struct dev_pm_ops dss_pm_ops = {
.runtime_suspend = dss_runtime_suspend,
.runtime_resume = dss_runtime_resume,
};
static struct platform_driver omap_dsshw_driver = {
.remove = __exit_p(omap_dsshw_remove),
.driver = {
.name = "omapdss_dss",
.owner = THIS_MODULE,
.pm = &dss_pm_ops,
},
};
int __init dss_init_platform_driver(void)
{
return platform_driver_probe(&omap_dsshw_driver, omap_dsshw_probe);
}
void dss_uninit_platform_driver(void)
{
platform_driver_unregister(&omap_dsshw_driver);
}
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