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drm/omap: add dmm_read() and dmm_write() wrappers

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This patch adds wrapper functions for readl() and writel(), dmm_read()
and dmm_write(), so that we can implement workaround for DRA7 errata
i878.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Tomi Valkeinen 2015-08-07 14:31:28 +03:00
parent 2bb2daf3fa
commit 8e54adfd9c
1 changed files with 24 additions and 15 deletions
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39
drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
View File

@ -79,6 +79,16 @@ static const uint32_t reg[][4] = {
DMM_PAT_DESCR__2, DMM_PAT_DESCR__3},
};
static u32 dmm_read(struct dmm *dmm, u32 reg)
{
return readl(dmm->base + reg);
}
static void dmm_write(struct dmm *dmm, u32 val, u32 reg)
{
writel(val, dmm->base + reg);
}
/* simple allocator to grab next 16 byte aligned memory from txn */
static void *alloc_dma(struct dmm_txn *txn, size_t sz, dma_addr_t *pa)
{
@ -108,7 +118,7 @@ static int wait_status(struct refill_engine *engine, uint32_t wait_mask)
i = DMM_FIXED_RETRY_COUNT;
while (true) {
r = readl(dmm->base + reg[PAT_STATUS][engine->id]);
r = dmm_read(dmm, reg[PAT_STATUS][engine->id]);
err = r & DMM_PATSTATUS_ERR;
if (err)
return -EFAULT;
@ -140,11 +150,11 @@ static void release_engine(struct refill_engine *engine)
static irqreturn_t omap_dmm_irq_handler(int irq, void *arg)
{
struct dmm *dmm = arg;
uint32_t status = readl(dmm->base + DMM_PAT_IRQSTATUS);
uint32_t status = dmm_read(dmm, DMM_PAT_IRQSTATUS);
int i;
/* ack IRQ */
writel(status, dmm->base + DMM_PAT_IRQSTATUS);
dmm_write(dmm, status, DMM_PAT_IRQSTATUS);
for (i = 0; i < dmm->num_engines; i++) {
if (status & DMM_IRQSTAT_LST) {
@ -264,7 +274,7 @@ static int dmm_txn_commit(struct dmm_txn *txn, bool wait)
txn->last_pat->next_pa = 0;
/* write to PAT_DESCR to clear out any pending transaction */
writel(0x0, dmm->base + reg[PAT_DESCR][engine->id]);
dmm_write(dmm, 0x0, reg[PAT_DESCR][engine->id]);
/* wait for engine ready: */
ret = wait_status(engine, DMM_PATSTATUS_READY);
@ -280,8 +290,7 @@ static int dmm_txn_commit(struct dmm_txn *txn, bool wait)
smp_mb();
/* kick reload */
writel(engine->refill_pa,
dmm->base + reg[PAT_DESCR][engine->id]);
dmm_write(dmm, engine->refill_pa, reg[PAT_DESCR][engine->id]);
if (wait) {
if (!wait_for_completion_timeout(&engine->compl,
@ -657,7 +666,7 @@ static int omap_dmm_probe(struct platform_device *dev)
omap_dmm->dev = &dev->dev;
hwinfo = readl(omap_dmm->base + DMM_PAT_HWINFO);
hwinfo = dmm_read(omap_dmm, DMM_PAT_HWINFO);
omap_dmm->num_engines = (hwinfo >> 24) & 0x1F;
omap_dmm->num_lut = (hwinfo >> 16) & 0x1F;
omap_dmm->container_width = 256;
@ -666,7 +675,7 @@ static int omap_dmm_probe(struct platform_device *dev)
atomic_set(&omap_dmm->engine_counter, omap_dmm->num_engines);
/* read out actual LUT width and height */
pat_geom = readl(omap_dmm->base + DMM_PAT_GEOMETRY);
pat_geom = dmm_read(omap_dmm, DMM_PAT_GEOMETRY);
omap_dmm->lut_width = ((pat_geom >> 16) & 0xF) << 5;
omap_dmm->lut_height = ((pat_geom >> 24) & 0xF) << 5;
@ -676,12 +685,12 @@ static int omap_dmm_probe(struct platform_device *dev)
omap_dmm->num_lut++;
/* initialize DMM registers */
writel(0x88888888, omap_dmm->base + DMM_PAT_VIEW__0);
writel(0x88888888, omap_dmm->base + DMM_PAT_VIEW__1);
writel(0x80808080, omap_dmm->base + DMM_PAT_VIEW_MAP__0);
writel(0x80000000, omap_dmm->base + DMM_PAT_VIEW_MAP_BASE);
writel(0x88888888, omap_dmm->base + DMM_TILER_OR__0);
writel(0x88888888, omap_dmm->base + DMM_TILER_OR__1);
dmm_write(omap_dmm, 0x88888888, DMM_PAT_VIEW__0);
dmm_write(omap_dmm, 0x88888888, DMM_PAT_VIEW__1);
dmm_write(omap_dmm, 0x80808080, DMM_PAT_VIEW_MAP__0);
dmm_write(omap_dmm, 0x80000000, DMM_PAT_VIEW_MAP_BASE);
dmm_write(omap_dmm, 0x88888888, DMM_TILER_OR__0);
dmm_write(omap_dmm, 0x88888888, DMM_TILER_OR__1);
ret = request_irq(omap_dmm->irq, omap_dmm_irq_handler, IRQF_SHARED,
"omap_dmm_irq_handler", omap_dmm);
@ -699,7 +708,7 @@ static int omap_dmm_probe(struct platform_device *dev)
* buffers for accelerated pan/scroll) and FILL_DSC<n> which
* we just generally don't care about.
*/
writel(0x7e7e7e7e, omap_dmm->base + DMM_PAT_IRQENABLE_SET);
dmm_write(omap_dmm, 0x7e7e7e7e, DMM_PAT_IRQENABLE_SET);
omap_dmm->dummy_page = alloc_page(GFP_KERNEL | __GFP_DMA32);
if (!omap_dmm->dummy_page) {