AMD-Xilinx zynqmp platform contains on-chip sram memory (OCM).
R5 cores can access OCM and access is faster than DDR memory but slower
than TCM memories available. Sram region can have optional multiple
power-domains. Platform management firmware is responsible
to operate these power-domains.
Signed-off-by: Tanmay Shah <tanmay.shah@xxxxxxx>
---
Changes in v4:
- Free previously allocalted genpool if adding carveouts fail for any
sram.
- add comment about sram size used in creating carveouts.
Changes in v3:
- make @sram an array rather than an array of pointers
- fix of_node_put usage to maintain proper refcount of node
- s/proprty/property
- Use gen pool framework for mapping sram address space.
Changes in v2:
- Expand commit message with power-domains related information.
drivers/remoteproc/xlnx_r5_remoteproc.c | 165 ++++++++++++++++++++++++
1 file changed, 165 insertions(+)
diff --git a/drivers/remoteproc/xlnx_r5_remoteproc.c b/drivers/remoteproc/xlnx_r5_remoteproc.c
index 2cea97c746fd..6d2ac7b85c8a 100644
--- a/drivers/remoteproc/xlnx_r5_remoteproc.c
+++ b/drivers/remoteproc/xlnx_r5_remoteproc.c
@@ -7,6 +7,7 @@
#include <dt-bindings/power/xlnx-zynqmp-power.h>
#include <linux/dma-mapping.h>
#include <linux/firmware/xlnx-zynqmp.h>
+#include <linux/genalloc.h>
#include <linux/kernel.h>
#include <linux/mailbox_client.h>
#include <linux/mailbox/zynqmp-ipi-message.h>
@@ -56,6 +57,21 @@ struct mem_bank_data {
char *bank_name;
};
+/**
+ * struct zynqmp_sram_bank - sram bank description
+ *
+ * @sram_pool: gen pool for his sram
+ * @sram_res: sram address region information
+ * @va: virtual address of allocated genpool
+ * @da: device address of sram
+ */
+struct zynqmp_sram_bank {
+ struct gen_pool *sram_pool;
+ struct resource sram_res;
+ void __iomem *va;
+ u32 da;
+};
+
/**
* struct mbox_info
*
@@ -120,6 +136,8 @@ static const struct mem_bank_data zynqmp_tcm_banks_lockstep[] = {
* struct zynqmp_r5_core
*
* @rsc_tbl_va: resource table virtual address
+ * @sram: Array of sram memories assigned to this core
+ * @num_sram: number of sram for this core
* @dev: device of RPU instance
* @np: device node of RPU instance
* @tcm_bank_count: number TCM banks accessible to this RPU
@@ -131,6 +149,8 @@ static const struct mem_bank_data zynqmp_tcm_banks_lockstep[] = {
*/
struct zynqmp_r5_core {
void __iomem *rsc_tbl_va;
+ struct zynqmp_sram_bank *sram;
+ int num_sram;
struct device *dev;
struct device_node *np;
int tcm_bank_count;
@@ -494,6 +514,56 @@ static int add_mem_regions_carveout(struct rproc *rproc)
return 0;
}
+static int add_sram_carveouts(struct rproc *rproc)
+{
+ struct zynqmp_r5_core *r5_core = rproc->priv;
+ struct rproc_mem_entry *rproc_mem;
+ struct zynqmp_sram_bank *sram;
+ size_t len, pool_size;
+ dma_addr_t dma_addr;
+ int da, i;
+
+ for (i = 0; i < r5_core->num_sram; i++) {
+ sram = &r5_core->sram[i];
+
+ dma_addr = (dma_addr_t)sram->sram_res.start;
+
+ /* Use actual resource size, as genpool size can be rounded up */
+ len = resource_size(&sram->sram_res);
+ da = sram->da;
+
+ pool_size = gen_pool_size(sram[i].sram_pool);
+ sram->va = (void __iomem *)gen_pool_alloc(sram->sram_pool, pool_size);
+ if (!sram->va) {
+ dev_err(r5_core->dev, "failed to alloc sram idx %d pool\n", i);
+ goto fail_add_sram_carveouts;
+ }
+
+ rproc_mem = rproc_mem_entry_init(&rproc->dev, sram->va,
+ (dma_addr_t)dma_addr,
+ len, da,
+ NULL, NULL,
+ sram->sram_res.name);
+
+ rproc_add_carveout(rproc, rproc_mem);
+ rproc_coredump_add_segment(rproc, da, len);
+
+ dev_dbg(&rproc->dev, "sram carveout %s addr=%llx, da=0x%x, size=0x%lx",
+ sram->sram_res.name, dma_addr, da, len);
+ }
+
+ return 0;
+
+fail_add_sram_carveouts:
+ while (--i > 0) {
+ pool_size = gen_pool_size(sram[i].sram_pool);
+ gen_pool_free(sram[i].sram_pool,
+ (unsigned long)r5_core->sram[i].va, pool_size);
+ }
+
+ return -ENOMEM;
+}
+
/*
* tcm_mem_unmap()
* @rproc: single R5 core's corresponding rproc instance
@@ -669,6 +739,12 @@ static int zynqmp_r5_rproc_prepare(struct rproc *rproc)
return ret;
}
+ ret = add_sram_carveouts(rproc);
+ if (ret) {
+ dev_err(&rproc->dev, "failed to get sram carveout %d\n", ret);
+ return ret;
+ }
+
return 0;
}
@@ -695,6 +771,12 @@ static int zynqmp_r5_rproc_unprepare(struct rproc *rproc)
"can't turn off TCM bank 0x%x", pm_domain_id);
}
+ for (i = 0; i < r5_core->num_sram; i++) {
+ gen_pool_free(r5_core->sram[i].sram_pool,
+ (unsigned long)r5_core->sram[i].va,
+ gen_pool_size(r5_core->sram[i].sram_pool));
+ }
+
return 0;
}
@@ -881,6 +963,85 @@ static struct zynqmp_r5_core *zynqmp_r5_add_rproc_core(struct device *cdev)
return ERR_PTR(ret);
}
+static int zynqmp_r5_get_sram_banks(struct zynqmp_r5_core *r5_core)
+{
+ struct device_node *np = r5_core->np;
+ struct device *dev = r5_core->dev;
+ struct zynqmp_sram_bank *sram;
+ struct device_node *sram_np;
+ int num_sram, i, ret;
+ u64 abs_addr, size;
+
+ /* "sram" is optional property. Do not fail, if unavailable. */
+ if (!of_property_present(r5_core->np, "sram"))
+ return 0;
+
+ num_sram = of_property_count_elems_of_size(np, "sram", sizeof(phandle));
+ if (num_sram <= 0) {
+ dev_err(dev, "Invalid sram property, ret = %d\n",
+ num_sram);
+ return -EINVAL;
+ }
+
+ sram = devm_kcalloc(dev, num_sram,
+ sizeof(struct zynqmp_sram_bank), GFP_KERNEL);
+ if (!sram)
+ return -ENOMEM;
+
+ for (i = 0; i < num_sram; i++) {
+ sram_np = of_parse_phandle(np, "sram", i);
+ if (!sram_np) {
+ dev_err(dev, "failed to get sram %d phandle\n", i);
+ ret = -EINVAL;
+ goto fail_sram_get;
+ }
+
+ if (!of_device_is_available(sram_np)) {
+ dev_err(dev, "sram device not available\n");
+ ret = -EINVAL;
+ goto fail_sram_get;
+ }
+
+ ret = of_address_to_resource(sram_np, 0, &sram[i].sram_res);
+ if (ret) {
+ dev_err(dev, "addr to res failed\n");
+ goto fail_sram_get;
+ }
+
+ sram[i].sram_pool = of_gen_pool_get(np, "sram", i);
+ if (!sram[i].sram_pool) {
+ dev_err(dev, "failed to get sram idx %d gen pool\n", i);
+ ret = -ENOMEM;
+ goto fail_sram_get;
+ }
+
+ /* Get SRAM device address */
+ ret = of_property_read_reg(sram_np, i, &abs_addr, &size);
+ if (ret) {
+ dev_err(dev, "failed to get reg property\n");
+ goto fail_sram_get;
+ }
+
+ sram[i].da = (u32)abs_addr;
+
+ of_node_put(sram_np);
+
+ dev_dbg(dev, "sram %d: name=%s, addr=0x%llx, da=0x%x, size=0x%llx\n",
+ i, sram[i].sram_res.name, sram[i].sram_res.start,
+ sram[i].da, resource_size(&sram[i].sram_res));
+ }
+
+ r5_core->sram = sram;
+ r5_core->num_sram = num_sram;
+
+ return 0;
+
+fail_sram_get:
+ of_node_put(sram_np);
+
+ return ret;
+}
+
static int zynqmp_r5_get_tcm_node_from_dt(struct zynqmp_r5_cluster *cluster)
{
int i, j, tcm_bank_count, ret, tcm_pd_idx, pd_count;
@@ -1095,6 +1256,10 @@ static int zynqmp_r5_core_init(struct zynqmp_r5_cluster *cluster,
return ret;
}
}
+
+ ret = zynqmp_r5_get_sram_banks(r5_core);
+ if (ret)
+ return ret;
}
return 0;
base-commit: 1a491aaf1d1ce3a1cf5190394c36f21d805c7e96
--
2.25.1
