From: John Hurley <john.hurley@netronome.com>
Date: Wed, 23 May 2018 19:22:49 -0700
Subject: nfp: nfpcore: add rtsym writing function
Patch-mainline: v4.18-rc1
Git-commit: 1945ca7a81d64e09ff0bd24deb64a328614f7b7b
References: bsc#1109837
Add an rtsym API function that combines the lookup of a symbol and the
writing of a value to it. Values can be written as unsigned 32 or 64 bits.
Signed-off-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nffw.h | 2
drivers/net/ethernet/netronome/nfp/nfpcore/nfp_rtsym.c | 43 +++++++++++++++++
2 files changed, 45 insertions(+)
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nffw.h
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nffw.h
@@ -100,6 +100,8 @@ nfp_rtsym_lookup(struct nfp_rtsym_table
u64 nfp_rtsym_read_le(struct nfp_rtsym_table *rtbl, const char *name,
int *error);
+int nfp_rtsym_write_le(struct nfp_rtsym_table *rtbl, const char *name,
+ u64 value);
u8 __iomem *
nfp_rtsym_map(struct nfp_rtsym_table *rtbl, const char *name, const char *id,
unsigned int min_size, struct nfp_cpp_area **area);
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_rtsym.c
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_rtsym.c
@@ -286,6 +286,49 @@ exit:
return val;
}
+/**
+ * nfp_rtsym_write_le() - Write an unsigned scalar value to a symbol
+ * @rtbl: NFP RTsym table
+ * @name: Symbol name
+ * @value: Value to write
+ *
+ * Lookup a symbol and write a value to it. Symbol can be 4 or 8 bytes in size.
+ * If 4 bytes then the lower 32-bits of 'value' are used. Value will be
+ * written as simple little-endian unsigned value.
+ *
+ * Return: 0 on success or error code.
+ */
+int nfp_rtsym_write_le(struct nfp_rtsym_table *rtbl, const char *name,
+ u64 value)
+{
+ const struct nfp_rtsym *sym;
+ int err;
+ u32 id;
+
+ sym = nfp_rtsym_lookup(rtbl, name);
+ if (!sym)
+ return -ENOENT;
+
+ id = NFP_CPP_ISLAND_ID(sym->target, NFP_CPP_ACTION_RW, 0, sym->domain);
+
+ switch (sym->size) {
+ case 4:
+ err = nfp_cpp_writel(rtbl->cpp, id, sym->addr, value);
+ break;
+ case 8:
+ err = nfp_cpp_writeq(rtbl->cpp, id, sym->addr, value);
+ break;
+ default:
+ nfp_err(rtbl->cpp,
+ "rtsym '%s' unsupported or non-scalar size: %lld\n",
+ name, sym->size);
+ err = -EINVAL;
+ break;
+ }
+
+ return err;
+}
+
u8 __iomem *
nfp_rtsym_map(struct nfp_rtsym_table *rtbl, const char *name, const char *id,
unsigned int min_size, struct nfp_cpp_area **area)