This patch adds wrapper functions for readl() and writel(), dmm_read() and dmm_write(), so that we can implement workaround for errata i878.
Signed-off-by: Tomi Valkeinen tomi.valkeinen@ti.com --- drivers/gpu/drm/omapdrm/omap_dmm_tiler.c | 39 ++++++++++++++++++++------------ 1 file changed, 24 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c index 4e04f9487375..fe5260477b52 100644 --- a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c +++ b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c @@ -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) { @@ -275,7 +285,7 @@ static int dmm_txn_commit(struct dmm_txn *txn, bool wait) readl(&txn->last_pat->next_pa);
/* 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); @@ -291,8 +301,7 @@ 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, @@ -659,7 +668,7 @@ 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; @@ -668,7 +677,7 @@ 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;
@@ -678,12 +687,12 @@ 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); @@ -701,7 +710,7 @@ 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) {