linux/drivers/video/sh_mobile_meram.c
Laurent Pinchart da6cf5125f sh_mobile_meram: Reset ICBs at unregistration time
When ICBs are unregistered and later reused they need to be reset to
avoid data corruption. Set the WBF, WF and RF bits to make sure ICBs get
reset properly.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
2011-09-05 16:37:13 +00:00

698 lines
18 KiB
C

/*
* SuperH Mobile MERAM Driver for SuperH Mobile LCDC Driver
*
* Copyright (c) 2011 Damian Hobson-Garcia <dhobsong@igel.co.jp>
* Takanari Hayama <taki@igel.co.jp>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/pm_runtime.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <video/sh_mobile_meram.h>
/* meram registers */
#define MEVCR1 0x4
#define MEVCR1_RST (1 << 31)
#define MEVCR1_WD (1 << 30)
#define MEVCR1_AMD1 (1 << 29)
#define MEVCR1_AMD0 (1 << 28)
#define MEQSEL1 0x40
#define MEQSEL2 0x44
#define MExxCTL 0x400
#define MExxCTL_BV (1 << 31)
#define MExxCTL_BSZ_SHIFT 28
#define MExxCTL_MSAR_MASK (0x7ff << MExxCTL_MSAR_SHIFT)
#define MExxCTL_MSAR_SHIFT 16
#define MExxCTL_NXT_MASK (0x1f << MExxCTL_NXT_SHIFT)
#define MExxCTL_NXT_SHIFT 11
#define MExxCTL_WD1 (1 << 10)
#define MExxCTL_WD0 (1 << 9)
#define MExxCTL_WS (1 << 8)
#define MExxCTL_CB (1 << 7)
#define MExxCTL_WBF (1 << 6)
#define MExxCTL_WF (1 << 5)
#define MExxCTL_RF (1 << 4)
#define MExxCTL_CM (1 << 3)
#define MExxCTL_MD_READ (1 << 0)
#define MExxCTL_MD_WRITE (2 << 0)
#define MExxCTL_MD_ICB_WB (3 << 0)
#define MExxCTL_MD_ICB (4 << 0)
#define MExxCTL_MD_FB (7 << 0)
#define MExxCTL_MD_MASK (7 << 0)
#define MExxBSIZE 0x404
#define MExxBSIZE_RCNT_SHIFT 28
#define MExxBSIZE_YSZM1_SHIFT 16
#define MExxBSIZE_XSZM1_SHIFT 0
#define MExxMNCF 0x408
#define MExxMNCF_KWBNM_SHIFT 28
#define MExxMNCF_KRBNM_SHIFT 24
#define MExxMNCF_BNM_SHIFT 16
#define MExxMNCF_XBV (1 << 15)
#define MExxMNCF_CPL_YCBCR444 (1 << 12)
#define MExxMNCF_CPL_YCBCR420 (2 << 12)
#define MExxMNCF_CPL_YCBCR422 (3 << 12)
#define MExxMNCF_CPL_MSK (3 << 12)
#define MExxMNCF_BL (1 << 2)
#define MExxMNCF_LNM_SHIFT 0
#define MExxSARA 0x410
#define MExxSARB 0x414
#define MExxSBSIZE 0x418
#define MExxSBSIZE_HDV (1 << 31)
#define MExxSBSIZE_HSZ16 (0 << 28)
#define MExxSBSIZE_HSZ32 (1 << 28)
#define MExxSBSIZE_HSZ64 (2 << 28)
#define MExxSBSIZE_HSZ128 (3 << 28)
#define MExxSBSIZE_SBSIZZ_SHIFT 0
#define MERAM_MExxCTL_VAL(next, addr) \
((((next) << MExxCTL_NXT_SHIFT) & MExxCTL_NXT_MASK) | \
(((addr) << MExxCTL_MSAR_SHIFT) & MExxCTL_MSAR_MASK))
#define MERAM_MExxBSIZE_VAL(rcnt, yszm1, xszm1) \
(((rcnt) << MExxBSIZE_RCNT_SHIFT) | \
((yszm1) << MExxBSIZE_YSZM1_SHIFT) | \
((xszm1) << MExxBSIZE_XSZM1_SHIFT))
#define SH_MOBILE_MERAM_ICB_NUM 32
static unsigned long common_regs[] = {
MEVCR1,
MEQSEL1,
MEQSEL2,
};
#define CMN_REGS_SIZE ARRAY_SIZE(common_regs)
static unsigned long icb_regs[] = {
MExxCTL,
MExxBSIZE,
MExxMNCF,
MExxSARA,
MExxSARB,
MExxSBSIZE,
};
#define ICB_REGS_SIZE ARRAY_SIZE(icb_regs)
struct sh_mobile_meram_priv {
void __iomem *base;
struct mutex lock;
unsigned long used_icb;
int used_meram_cache_regions;
unsigned long used_meram_cache[SH_MOBILE_MERAM_ICB_NUM];
unsigned long cmn_saved_regs[CMN_REGS_SIZE];
unsigned long icb_saved_regs[ICB_REGS_SIZE * SH_MOBILE_MERAM_ICB_NUM];
};
/* settings */
#define MERAM_SEC_LINE 15
#define MERAM_LINE_WIDTH 2048
/*
* MERAM/ICB access functions
*/
#define MERAM_ICB_OFFSET(base, idx, off) ((base) + (off) + (idx) * 0x20)
static inline void meram_write_icb(void __iomem *base, int idx, int off,
unsigned long val)
{
iowrite32(val, MERAM_ICB_OFFSET(base, idx, off));
}
static inline unsigned long meram_read_icb(void __iomem *base, int idx, int off)
{
return ioread32(MERAM_ICB_OFFSET(base, idx, off));
}
static inline void meram_write_reg(void __iomem *base, int off,
unsigned long val)
{
iowrite32(val, base + off);
}
static inline unsigned long meram_read_reg(void __iomem *base, int off)
{
return ioread32(base + off);
}
/*
* register ICB
*/
#define MERAM_CACHE_START(p) ((p) >> 16)
#define MERAM_CACHE_END(p) ((p) & 0xffff)
#define MERAM_CACHE_SET(o, s) ((((o) & 0xffff) << 16) | \
(((o) + (s) - 1) & 0xffff))
/*
* check if there's no overlaps in MERAM allocation.
*/
static inline int meram_check_overlap(struct sh_mobile_meram_priv *priv,
struct sh_mobile_meram_icb *new)
{
int i;
int used_start, used_end, meram_start, meram_end;
/* valid ICB? */
if (new->marker_icb & ~0x1f || new->cache_icb & ~0x1f)
return 1;
if (test_bit(new->marker_icb, &priv->used_icb) ||
test_bit(new->cache_icb, &priv->used_icb))
return 1;
for (i = 0; i < priv->used_meram_cache_regions; i++) {
used_start = MERAM_CACHE_START(priv->used_meram_cache[i]);
used_end = MERAM_CACHE_END(priv->used_meram_cache[i]);
meram_start = new->meram_offset;
meram_end = new->meram_offset + new->meram_size;
if ((meram_start >= used_start && meram_start < used_end) ||
(meram_end > used_start && meram_end < used_end))
return 1;
}
return 0;
}
/*
* mark the specified ICB as used
*/
static inline void meram_mark(struct sh_mobile_meram_priv *priv,
struct sh_mobile_meram_icb *new)
{
int n;
if (new->marker_icb < 0 || new->cache_icb < 0)
return;
__set_bit(new->marker_icb, &priv->used_icb);
__set_bit(new->cache_icb, &priv->used_icb);
n = priv->used_meram_cache_regions;
priv->used_meram_cache[n] = MERAM_CACHE_SET(new->meram_offset,
new->meram_size);
priv->used_meram_cache_regions++;
}
/*
* unmark the specified ICB as used
*/
static inline void meram_unmark(struct sh_mobile_meram_priv *priv,
struct sh_mobile_meram_icb *icb)
{
int i;
unsigned long pattern;
if (icb->marker_icb < 0 || icb->cache_icb < 0)
return;
__clear_bit(icb->marker_icb, &priv->used_icb);
__clear_bit(icb->cache_icb, &priv->used_icb);
pattern = MERAM_CACHE_SET(icb->meram_offset, icb->meram_size);
for (i = 0; i < priv->used_meram_cache_regions; i++) {
if (priv->used_meram_cache[i] == pattern) {
while (i < priv->used_meram_cache_regions - 1) {
priv->used_meram_cache[i] =
priv->used_meram_cache[i + 1] ;
i++;
}
priv->used_meram_cache[i] = 0;
priv->used_meram_cache_regions--;
break;
}
}
}
/*
* is this a YCbCr(NV12, NV16 or NV24) colorspace
*/
static inline int is_nvcolor(int cspace)
{
if (cspace == SH_MOBILE_MERAM_PF_NV ||
cspace == SH_MOBILE_MERAM_PF_NV24)
return 1;
return 0;
}
/*
* set the next address to fetch
*/
static inline void meram_set_next_addr(struct sh_mobile_meram_priv *priv,
struct sh_mobile_meram_cfg *cfg,
unsigned long base_addr_y,
unsigned long base_addr_c)
{
unsigned long target;
target = (cfg->current_reg) ? MExxSARA : MExxSARB;
cfg->current_reg ^= 1;
/* set the next address to fetch */
meram_write_icb(priv->base, cfg->icb[0].cache_icb, target,
base_addr_y);
meram_write_icb(priv->base, cfg->icb[0].marker_icb, target,
base_addr_y + cfg->icb[0].cache_unit);
if (is_nvcolor(cfg->pixelformat)) {
meram_write_icb(priv->base, cfg->icb[1].cache_icb, target,
base_addr_c);
meram_write_icb(priv->base, cfg->icb[1].marker_icb, target,
base_addr_c + cfg->icb[1].cache_unit);
}
}
/*
* get the next ICB address
*/
static inline void meram_get_next_icb_addr(struct sh_mobile_meram_info *pdata,
struct sh_mobile_meram_cfg *cfg,
unsigned long *icb_addr_y,
unsigned long *icb_addr_c)
{
unsigned long icb_offset;
if (pdata->addr_mode == SH_MOBILE_MERAM_MODE0)
icb_offset = 0x80000000 | (cfg->current_reg << 29);
else
icb_offset = 0xc0000000 | (cfg->current_reg << 23);
*icb_addr_y = icb_offset | (cfg->icb[0].marker_icb << 24);
if (is_nvcolor(cfg->pixelformat))
*icb_addr_c = icb_offset | (cfg->icb[1].marker_icb << 24);
}
#define MERAM_CALC_BYTECOUNT(x, y) \
(((x) * (y) + (MERAM_LINE_WIDTH - 1)) & ~(MERAM_LINE_WIDTH - 1))
/*
* initialize MERAM
*/
static int meram_init(struct sh_mobile_meram_priv *priv,
struct sh_mobile_meram_icb *icb,
int xres, int yres, int *out_pitch)
{
unsigned long total_byte_count = MERAM_CALC_BYTECOUNT(xres, yres);
unsigned long bnm;
int lcdc_pitch, xpitch, line_cnt;
int save_lines;
/* adjust pitch to 1024, 2048, 4096 or 8192 */
lcdc_pitch = (xres - 1) | 1023;
lcdc_pitch = lcdc_pitch | (lcdc_pitch >> 1);
lcdc_pitch = lcdc_pitch | (lcdc_pitch >> 2);
lcdc_pitch += 1;
/* derive settings */
if (lcdc_pitch == 8192 && yres >= 1024) {
lcdc_pitch = xpitch = MERAM_LINE_WIDTH;
line_cnt = total_byte_count >> 11;
*out_pitch = xres;
save_lines = (icb->meram_size / 16 / MERAM_SEC_LINE);
save_lines *= MERAM_SEC_LINE;
} else {
xpitch = xres;
line_cnt = yres;
*out_pitch = lcdc_pitch;
save_lines = icb->meram_size / (lcdc_pitch >> 10) / 2;
save_lines &= 0xff;
}
bnm = (save_lines - 1) << 16;
/* TODO: we better to check if we have enough MERAM buffer size */
/* set up ICB */
meram_write_icb(priv->base, icb->cache_icb, MExxBSIZE,
MERAM_MExxBSIZE_VAL(0x0, line_cnt - 1, xpitch - 1));
meram_write_icb(priv->base, icb->marker_icb, MExxBSIZE,
MERAM_MExxBSIZE_VAL(0xf, line_cnt - 1, xpitch - 1));
meram_write_icb(priv->base, icb->cache_icb, MExxMNCF, bnm);
meram_write_icb(priv->base, icb->marker_icb, MExxMNCF, bnm);
meram_write_icb(priv->base, icb->cache_icb, MExxSBSIZE, xpitch);
meram_write_icb(priv->base, icb->marker_icb, MExxSBSIZE, xpitch);
/* save a cache unit size */
icb->cache_unit = xres * save_lines;
/*
* Set MERAM for framebuffer
*
* we also chain the cache_icb and the marker_icb.
* we also split the allocated MERAM buffer between two ICBs.
*/
meram_write_icb(priv->base, icb->cache_icb, MExxCTL,
MERAM_MExxCTL_VAL(icb->marker_icb, icb->meram_offset) |
MExxCTL_WD1 | MExxCTL_WD0 | MExxCTL_WS | MExxCTL_CM |
MExxCTL_MD_FB);
meram_write_icb(priv->base, icb->marker_icb, MExxCTL,
MERAM_MExxCTL_VAL(icb->cache_icb, icb->meram_offset +
icb->meram_size / 2) |
MExxCTL_WD1 | MExxCTL_WD0 | MExxCTL_WS | MExxCTL_CM |
MExxCTL_MD_FB);
return 0;
}
static void meram_deinit(struct sh_mobile_meram_priv *priv,
struct sh_mobile_meram_icb *icb)
{
/* disable ICB */
meram_write_icb(priv->base, icb->cache_icb, MExxCTL,
MExxCTL_WBF | MExxCTL_WF | MExxCTL_RF);
meram_write_icb(priv->base, icb->marker_icb, MExxCTL,
MExxCTL_WBF | MExxCTL_WF | MExxCTL_RF);
icb->cache_unit = 0;
}
/*
* register the ICB
*/
static int sh_mobile_meram_register(struct sh_mobile_meram_info *pdata,
struct sh_mobile_meram_cfg *cfg,
int xres, int yres, int pixelformat,
unsigned long base_addr_y,
unsigned long base_addr_c,
unsigned long *icb_addr_y,
unsigned long *icb_addr_c,
int *pitch)
{
struct platform_device *pdev;
struct sh_mobile_meram_priv *priv;
int n, out_pitch;
int error = 0;
if (!pdata || !pdata->priv || !pdata->pdev || !cfg)
return -EINVAL;
if (pixelformat != SH_MOBILE_MERAM_PF_NV &&
pixelformat != SH_MOBILE_MERAM_PF_NV24 &&
pixelformat != SH_MOBILE_MERAM_PF_RGB)
return -EINVAL;
priv = pdata->priv;
pdev = pdata->pdev;
dev_dbg(&pdev->dev, "registering %dx%d (%s) (y=%08lx, c=%08lx)",
xres, yres, (!pixelformat) ? "yuv" : "rgb",
base_addr_y, base_addr_c);
/* we can't handle wider than 8192px */
if (xres > 8192) {
dev_err(&pdev->dev, "width exceeding the limit (> 8192).");
return -EINVAL;
}
/* do we have at least one ICB config? */
if (cfg->icb[0].marker_icb < 0 || cfg->icb[0].cache_icb < 0) {
dev_err(&pdev->dev, "at least one ICB is required.");
return -EINVAL;
}
mutex_lock(&priv->lock);
if (priv->used_meram_cache_regions + 2 > SH_MOBILE_MERAM_ICB_NUM) {
dev_err(&pdev->dev, "no more ICB available.");
error = -EINVAL;
goto err;
}
/* make sure that there's no overlaps */
if (meram_check_overlap(priv, &cfg->icb[0])) {
dev_err(&pdev->dev, "conflicting config detected.");
error = -EINVAL;
goto err;
}
n = 1;
/* do the same if we have the second ICB set */
if (cfg->icb[1].marker_icb >= 0 && cfg->icb[1].cache_icb >= 0) {
if (meram_check_overlap(priv, &cfg->icb[1])) {
dev_err(&pdev->dev, "conflicting config detected.");
error = -EINVAL;
goto err;
}
n = 2;
}
if (is_nvcolor(pixelformat) && n != 2) {
dev_err(&pdev->dev, "requires two ICB sets for planar Y/C.");
error = -EINVAL;
goto err;
}
/* we now register the ICB */
cfg->pixelformat = pixelformat;
meram_mark(priv, &cfg->icb[0]);
if (is_nvcolor(pixelformat))
meram_mark(priv, &cfg->icb[1]);
/* initialize MERAM */
meram_init(priv, &cfg->icb[0], xres, yres, &out_pitch);
*pitch = out_pitch;
if (pixelformat == SH_MOBILE_MERAM_PF_NV)
meram_init(priv, &cfg->icb[1], xres, (yres + 1) / 2,
&out_pitch);
else if (pixelformat == SH_MOBILE_MERAM_PF_NV24)
meram_init(priv, &cfg->icb[1], 2 * xres, (yres + 1) / 2,
&out_pitch);
cfg->current_reg = 1;
meram_set_next_addr(priv, cfg, base_addr_y, base_addr_c);
meram_get_next_icb_addr(pdata, cfg, icb_addr_y, icb_addr_c);
dev_dbg(&pdev->dev, "registered - can access via y=%08lx, c=%08lx",
*icb_addr_y, *icb_addr_c);
err:
mutex_unlock(&priv->lock);
return error;
}
static int sh_mobile_meram_unregister(struct sh_mobile_meram_info *pdata,
struct sh_mobile_meram_cfg *cfg)
{
struct sh_mobile_meram_priv *priv;
if (!pdata || !pdata->priv || !cfg)
return -EINVAL;
priv = pdata->priv;
mutex_lock(&priv->lock);
/* deinit & unmark */
if (is_nvcolor(cfg->pixelformat)) {
meram_deinit(priv, &cfg->icb[1]);
meram_unmark(priv, &cfg->icb[1]);
}
meram_deinit(priv, &cfg->icb[0]);
meram_unmark(priv, &cfg->icb[0]);
mutex_unlock(&priv->lock);
return 0;
}
static int sh_mobile_meram_update(struct sh_mobile_meram_info *pdata,
struct sh_mobile_meram_cfg *cfg,
unsigned long base_addr_y,
unsigned long base_addr_c,
unsigned long *icb_addr_y,
unsigned long *icb_addr_c)
{
struct sh_mobile_meram_priv *priv;
if (!pdata || !pdata->priv || !cfg)
return -EINVAL;
priv = pdata->priv;
mutex_lock(&priv->lock);
meram_set_next_addr(priv, cfg, base_addr_y, base_addr_c);
meram_get_next_icb_addr(pdata, cfg, icb_addr_y, icb_addr_c);
mutex_unlock(&priv->lock);
return 0;
}
static int sh_mobile_meram_runtime_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct sh_mobile_meram_priv *priv = platform_get_drvdata(pdev);
int k, j;
for (k = 0; k < CMN_REGS_SIZE; k++)
priv->cmn_saved_regs[k] = meram_read_reg(priv->base,
common_regs[k]);
for (j = 0; j < 32; j++) {
if (!test_bit(j, &priv->used_icb))
continue;
for (k = 0; k < ICB_REGS_SIZE; k++) {
priv->icb_saved_regs[j * ICB_REGS_SIZE + k] =
meram_read_icb(priv->base, j, icb_regs[k]);
/* Reset ICB on resume */
if (icb_regs[k] == MExxCTL)
priv->icb_saved_regs[j * ICB_REGS_SIZE + k] |=
MExxCTL_WBF | MExxCTL_WF | MExxCTL_RF;
}
}
return 0;
}
static int sh_mobile_meram_runtime_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct sh_mobile_meram_priv *priv = platform_get_drvdata(pdev);
int k, j;
for (j = 0; j < 32; j++) {
if (!test_bit(j, &priv->used_icb))
continue;
for (k = 0; k < ICB_REGS_SIZE; k++) {
meram_write_icb(priv->base, j, icb_regs[k],
priv->icb_saved_regs[j * ICB_REGS_SIZE + k]);
}
}
for (k = 0; k < CMN_REGS_SIZE; k++)
meram_write_reg(priv->base, common_regs[k],
priv->cmn_saved_regs[k]);
return 0;
}
static const struct dev_pm_ops sh_mobile_meram_dev_pm_ops = {
.runtime_suspend = sh_mobile_meram_runtime_suspend,
.runtime_resume = sh_mobile_meram_runtime_resume,
};
static struct sh_mobile_meram_ops sh_mobile_meram_ops = {
.module = THIS_MODULE,
.meram_register = sh_mobile_meram_register,
.meram_unregister = sh_mobile_meram_unregister,
.meram_update = sh_mobile_meram_update,
};
/*
* initialize MERAM
*/
static int sh_mobile_meram_remove(struct platform_device *pdev);
static int __devinit sh_mobile_meram_probe(struct platform_device *pdev)
{
struct sh_mobile_meram_priv *priv;
struct sh_mobile_meram_info *pdata = pdev->dev.platform_data;
struct resource *res;
int error;
if (!pdata) {
dev_err(&pdev->dev, "no platform data defined\n");
return -EINVAL;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "cannot get platform resources\n");
return -ENOENT;
}
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv) {
dev_err(&pdev->dev, "cannot allocate device data\n");
return -ENOMEM;
}
platform_set_drvdata(pdev, priv);
/* initialize private data */
mutex_init(&priv->lock);
priv->base = ioremap_nocache(res->start, resource_size(res));
if (!priv->base) {
dev_err(&pdev->dev, "ioremap failed\n");
error = -EFAULT;
goto err;
}
pdata->ops = &sh_mobile_meram_ops;
pdata->priv = priv;
pdata->pdev = pdev;
/* initialize ICB addressing mode */
if (pdata->addr_mode == SH_MOBILE_MERAM_MODE1)
meram_write_reg(priv->base, MEVCR1, MEVCR1_AMD1);
pm_runtime_enable(&pdev->dev);
dev_info(&pdev->dev, "sh_mobile_meram initialized.");
return 0;
err:
sh_mobile_meram_remove(pdev);
return error;
}
static int sh_mobile_meram_remove(struct platform_device *pdev)
{
struct sh_mobile_meram_priv *priv = platform_get_drvdata(pdev);
pm_runtime_disable(&pdev->dev);
if (priv->base)
iounmap(priv->base);
mutex_destroy(&priv->lock);
kfree(priv);
return 0;
}
static struct platform_driver sh_mobile_meram_driver = {
.driver = {
.name = "sh_mobile_meram",
.owner = THIS_MODULE,
.pm = &sh_mobile_meram_dev_pm_ops,
},
.probe = sh_mobile_meram_probe,
.remove = sh_mobile_meram_remove,
};
static int __init sh_mobile_meram_init(void)
{
return platform_driver_register(&sh_mobile_meram_driver);
}
static void __exit sh_mobile_meram_exit(void)
{
platform_driver_unregister(&sh_mobile_meram_driver);
}
module_init(sh_mobile_meram_init);
module_exit(sh_mobile_meram_exit);
MODULE_DESCRIPTION("SuperH Mobile MERAM driver");
MODULE_AUTHOR("Damian Hobson-Garcia / Takanari Hayama");
MODULE_LICENSE("GPL v2");