misc: fastrpc: Update dma_bits for CDSP support on Kaanapali SoC

DSP currently supports 32-bit IOVA (32-bit PA + 4-bit SID) for
both Q6 and user DMA (uDMA) access. This is being upgraded to
34-bit PA + 4-bit SID due to a hardware revision in CDSP for
Kaanapali SoC, which expands the DMA addressable range.
Update DMA bits configuration in the driver to support CDSP on
Kaanapali SoC. Set the default `dma_bits` to 32-bit and update
it to 34-bit based on CDSP and OF matching on the fastrpc node.

Signed-off-by: Kumari Pallavi <kumari.pallavi@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://patch.msgid.link/20251226070534.602021-5-kumari.pallavi@oss.qualcomm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index fcc80206b7c4bea645603f2748cd54aa5c7a0b57..4f5a79c50f588eb1deb4d4b3feaec79db8bdcf70 100644 (file)
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -259,6 +259,8 @@ struct fastrpc_session_ctx {
 
 struct fastrpc_soc_data {
        u32 sid_pos;
+       u32 dma_addr_bits_cdsp;
+       u32 dma_addr_bits_default;
 };
 
 struct fastrpc_channel_ctx {
@@ -2197,6 +2199,7 @@ static int fastrpc_cb_probe(struct platform_device *pdev)
        int i, sessions = 0;
        unsigned long flags;
        int rc;
+       u32 dma_bits;
 
        cctx = dev_get_drvdata(dev->parent);
        if (!cctx)
@@ -2210,12 +2213,16 @@ static int fastrpc_cb_probe(struct platform_device *pdev)
                spin_unlock_irqrestore(&cctx->lock, flags);
                return -ENOSPC;
        }
+       dma_bits = cctx->soc_data->dma_addr_bits_default;
        sess = &cctx->session[cctx->sesscount++];
        sess->used = false;
        sess->valid = true;
        sess->dev = dev;
        dev_set_drvdata(dev, sess);
 
+       if (cctx->domain_id == CDSP_DOMAIN_ID)
+               dma_bits = cctx->soc_data->dma_addr_bits_cdsp;
+
        if (of_property_read_u32(dev->of_node, "reg", &sess->sid))
                dev_info(dev, "FastRPC Session ID not specified in DT\n");
 
@@ -2230,9 +2237,9 @@ static int fastrpc_cb_probe(struct platform_device *pdev)
                }
        }
        spin_unlock_irqrestore(&cctx->lock, flags);
-       rc = dma_set_mask(dev, DMA_BIT_MASK(32));
+       rc = dma_set_mask(dev, DMA_BIT_MASK(dma_bits));
        if (rc) {
-               dev_err(dev, "32-bit DMA enable failed\n");
+               dev_err(dev, "%u-bit DMA enable failed\n", dma_bits);
                return rc;
        }
 
@@ -2319,10 +2326,14 @@ static int fastrpc_get_domain_id(const char *domain)
 
 static const struct fastrpc_soc_data kaanapali_soc_data = {
        .sid_pos = 56,
+       .dma_addr_bits_cdsp = 34,
+       .dma_addr_bits_default = 32,
 };
 
 static const struct fastrpc_soc_data default_soc_data = {
        .sid_pos = 32,
+       .dma_addr_bits_cdsp = 32,
+       .dma_addr_bits_default = 32,
 };
 
 static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)