[PATCH 15/52] mips: octeon: Add cvmx-helper-loop.c

[Stefan Roese <sr@denx.de>]

From: Aaron Williams <awilliams@marvell.com>

Import cvmx-helper-loop.c from 2013 U-Boot. It will be used by the later
added drivers to support networking on the MIPS Octeon II / III
platforms.

Signed-off-by: Aaron Williams <awilliams@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>
---
 arch/mips/mach-octeon/cvmx-helper-loop.c | 178 +++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 arch/mips/mach-octeon/cvmx-helper-loop.c

diff --git a/arch/mips/mach-octeon/cvmx-helper-loop.c b/arch/mips/mach-octeon/cvmx-helper-loop.c
new file mode 100644
index 000000000000..8eaeac387df4
--- /dev/null
+++ b/arch/mips/mach-octeon/cvmx-helper-loop.c
@@ -0,0 +1,178 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018-2022 Marvell International Ltd.
+ *
+ * Functions for LOOP initialization, configuration,
+ * and monitoring.
+ */
+
+#include <log.h>
+#include <malloc.h>
+#include <net.h>
+#include <linux/delay.h>
+
+#include <mach/cvmx-regs.h>
+#include <mach/cvmx-csr.h>
+#include <mach/cvmx-bootmem.h>
+#include <mach/octeon-model.h>
+#include <mach/octeon_fdt.h>
+#include <mach/cvmx-helper.h>
+#include <mach/cvmx-helper-board.h>
+#include <mach/cvmx-helper-cfg.h>
+#include <mach/cvmx-helper-fdt.h>
+#include <mach/cvmx-helper-gpio.h>
+
+#include <mach/cvmx-agl-defs.h>
+#include <mach/cvmx-bgxx-defs.h>
+#include <mach/cvmx-ciu-defs.h>
+#include <mach/cvmx-gmxx-defs.h>
+#include <mach/cvmx-gserx-defs.h>
+#include <mach/cvmx-ilk-defs.h>
+#include <mach/cvmx-ipd-defs.h>
+#include <mach/cvmx-lbk-defs.h>
+#include <mach/cvmx-pcsx-defs.h>
+#include <mach/cvmx-pcsxx-defs.h>
+#include <mach/cvmx-pki-defs.h>
+#include <mach/cvmx-pko-defs.h>
+#include <mach/cvmx-xcv-defs.h>
+
+#include <mach/cvmx-hwpko.h>
+#include <mach/cvmx-ilk.h>
+#include <mach/cvmx-pki.h>
+
+int __cvmx_helper_loop_enumerate(int xiface)
+{
+	return OCTEON_IS_MODEL(OCTEON_CN68XX) ?
+		       8 : (OCTEON_IS_MODEL(OCTEON_CNF71XX) ? 2 : 4);
+}
+
+/**
+ * @INTERNAL
+ * Probe a LOOP interface and determine the number of ports
+ * connected to it. The LOOP interface should still be down
+ * after this call.
+ *
+ * @param xiface Interface to probe
+ *
+ * @return Number of ports on the interface. Zero to disable.
+ */
+int __cvmx_helper_loop_probe(int xiface)
+{
+	return __cvmx_helper_loop_enumerate(xiface);
+}
+
+/**
+ * @INTERNAL
+ * Bringup and enable a LOOP interface. After this call packet
+ * I/O should be fully functional. This is called with IPD
+ * enabled but PKO disabled.
+ *
+ * @param interface to bring up
+ *
+ * @return Zero on success, negative on failure
+ */
+int __cvmx_helper_loop_enable(int xiface)
+{
+	cvmx_pip_prt_cfgx_t port_cfg;
+	int num_ports, index;
+	unsigned long offset;
+	struct cvmx_xiface xi = cvmx_helper_xiface_to_node_interface(xiface);
+
+	num_ports = __cvmx_helper_get_num_ipd_ports(xiface);
+	/*
+	 * We need to disable length checking so packet < 64 bytes and jumbo
+	 * frames don't get errors
+	 */
+	for (index = 0; index < num_ports; index++) {
+		offset = ((octeon_has_feature(OCTEON_FEATURE_PKND)) ?
+				  cvmx_helper_get_pknd(xiface, index) :
+					cvmx_helper_get_ipd_port(xiface, index));
+
+		if (octeon_has_feature(OCTEON_FEATURE_PKI)) {
+			cvmx_pki_endis_l2_errs(xi.node, offset, 1, 0, 0);
+			cvmx_pki_endis_fcs_check(xi.node, offset, 0, 0);
+		} else {
+			port_cfg.u64 = csr_rd(CVMX_PIP_PRT_CFGX(offset));
+			port_cfg.s.maxerr_en = 0;
+			port_cfg.s.minerr_en = 0;
+			csr_wr(CVMX_PIP_PRT_CFGX(offset), port_cfg.u64);
+		}
+	}
+
+	/*
+	 * Disable FCS stripping for loopback ports
+	 */
+	if (!octeon_has_feature(OCTEON_FEATURE_PKND)) {
+		cvmx_ipd_sub_port_fcs_t ipd_sub_port_fcs;
+
+		ipd_sub_port_fcs.u64 = csr_rd(CVMX_IPD_SUB_PORT_FCS);
+		ipd_sub_port_fcs.s.port_bit2 = 0;
+		csr_wr(CVMX_IPD_SUB_PORT_FCS, ipd_sub_port_fcs.u64);
+	}
+	/*
+	 * Set PKND and BPID for loopback ports.
+	 */
+	if (OCTEON_IS_MODEL(OCTEON_CN68XX)) {
+		cvmx_pko_reg_loopback_pkind_t lp_pknd;
+		cvmx_pko_reg_loopback_bpid_t lp_bpid;
+
+		for (index = 0; index < num_ports; index++) {
+			int pknd = cvmx_helper_get_pknd(xiface, index);
+			int bpid = cvmx_helper_get_bpid(xiface, index);
+
+			lp_pknd.u64 = csr_rd(CVMX_PKO_REG_LOOPBACK_PKIND);
+			lp_bpid.u64 = csr_rd(CVMX_PKO_REG_LOOPBACK_BPID);
+
+			if (index == 0)
+				lp_pknd.s.num_ports = num_ports;
+
+			switch (index) {
+			case 0:
+				lp_pknd.s.pkind0 = pknd;
+				lp_bpid.s.bpid0 = bpid;
+				break;
+			case 1:
+				lp_pknd.s.pkind1 = pknd;
+				lp_bpid.s.bpid1 = bpid;
+				break;
+			case 2:
+				lp_pknd.s.pkind2 = pknd;
+				lp_bpid.s.bpid2 = bpid;
+				break;
+			case 3:
+				lp_pknd.s.pkind3 = pknd;
+				lp_bpid.s.bpid3 = bpid;
+				break;
+			case 4:
+				lp_pknd.s.pkind4 = pknd;
+				lp_bpid.s.bpid4 = bpid;
+				break;
+			case 5:
+				lp_pknd.s.pkind5 = pknd;
+				lp_bpid.s.bpid5 = bpid;
+				break;
+			case 6:
+				lp_pknd.s.pkind6 = pknd;
+				lp_bpid.s.bpid6 = bpid;
+				break;
+			case 7:
+				lp_pknd.s.pkind7 = pknd;
+				lp_bpid.s.bpid7 = bpid;
+				break;
+			}
+			csr_wr(CVMX_PKO_REG_LOOPBACK_PKIND, lp_pknd.u64);
+			csr_wr(CVMX_PKO_REG_LOOPBACK_BPID, lp_bpid.u64);
+		}
+	} else if (octeon_has_feature(OCTEON_FEATURE_BGX)) {
+		cvmx_lbk_chx_pkind_t lbk_pkind;
+
+		for (index = 0; index < num_ports; index++) {
+			lbk_pkind.u64 = 0;
+			lbk_pkind.s.pkind = cvmx_helper_get_pknd(xiface, index);
+			csr_wr_node(xi.node, CVMX_LBK_CHX_PKIND(index),
+				    lbk_pkind.u64);
+		}
+	}
+
+	return 0;
+}
-- 
2.35.1