@@ -39,6 +39,8 @@
#define STM32_MBX_VQ1_ID 1
#define STM32_MBX_SHUTDOWN "shutdown"
+#define RSC_TBL_SIZE 1024
+
#define M4_STATE_OFF 0
#define M4_STATE_INI 1
#define M4_STATE_CRUN 2
@@ -86,6 +88,7 @@ struct stm32_rproc {
struct stm32_mbox mb[MBOX_NB_MBX];
struct workqueue_struct *workqueue;
bool secured_soc;
+ void __iomem *rsc_va;
};
static int stm32_rproc_pa_to_da(struct rproc *rproc, phys_addr_t pa, u64 *da)
@@ -669,6 +672,75 @@ static int stm32_rproc_get_m4_status(struct stm32_rproc *ddata,
return regmap_read(ddata->m4_state.map, ddata->m4_state.reg, state);
}
+static int stm32_rproc_da_to_pa(struct platform_device *pdev,
+ struct stm32_rproc *ddata,
+ u64 da, phys_addr_t *pa)
+{
+ struct device *dev = &pdev->dev;
+ struct stm32_rproc_mem *p_mem;
+ unsigned int i;
+
+ for (i = 0; i < ddata->nb_rmems; i++) {
+ p_mem = &ddata->rmems[i];
+
+ if (da < p_mem->dev_addr ||
+ da >= p_mem->dev_addr + p_mem->size)
+ continue;
+
+ *pa = da - p_mem->dev_addr + p_mem->bus_addr;
+ dev_dbg(dev, "da %llx to pa %#x\n", da, *pa);
+
+ return 0;
+ }
+
+ dev_err(dev, "can't translate da %llx\n", da);
+
+ return -EINVAL;
+}
+
+static int stm32_rproc_get_loaded_rsc_table(struct platform_device *pdev,
+ struct rproc *rproc,
+ struct stm32_rproc *ddata)
+{
+ struct device *dev = &pdev->dev;
+ phys_addr_t rsc_pa;
+ u32 rsc_da;
+ int err;
+
+ err = regmap_read(ddata->rsctbl.map, ddata->rsctbl.reg, &rsc_da);
+ if (err) {
+ dev_err(dev, "failed to read rsc tbl addr\n");
+ return err;
+ }
+
+ if (!rsc_da)
+ /* no rsc table */
+ return 0;
+
+ err = stm32_rproc_da_to_pa(pdev, ddata, rsc_da, &rsc_pa);
+ if (err)
+ return err;
+
+ ddata->rsc_va = devm_ioremap_wc(dev, rsc_pa, RSC_TBL_SIZE);
+ if (IS_ERR_OR_NULL(ddata->rsc_va)) {
+ dev_err(dev, "Unable to map memory region: %pa+%zx\n",
+ &rsc_pa, RSC_TBL_SIZE);
+ ddata->rsc_va = NULL;
+ return -ENOMEM;
+ }
+
+ /*
+ * The resource table is already loaded in device memory, no need
+ * to work with a cached table.
+ */
+ rproc->cached_table = NULL;
+ /* Assuming the resource table fits in 1kB is fair */
+ rproc->table_sz = RSC_TBL_SIZE;
+ rproc->table_ptr = (struct resource_table *)ddata->rsc_va;
+
+ return 0;
+}
+
static int stm32_rproc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -708,6 +780,10 @@ static int stm32_rproc_probe(struct platform_device *pdev)
ret = stm32_rproc_parse_memory_regions(rproc);
if (ret)
goto free_resources;
+
+ ret = stm32_rproc_get_loaded_rsc_table(pdev, rproc, ddata);
+ if (ret)
+ goto free_resources;
}
rproc->has_iommu = false;
Properly set the remote processor's resource table based on where it was loaded by the external entity when attaching to a remote processor. Mainly based on the work published by Arnaud Pouliquen [1]. [1]. https://patchwork.kernel.org/project/linux-remoteproc/list/?series=239877 Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> --- drivers/remoteproc/stm32_rproc.c | 76 ++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+)