[PATCH 09/52] mips: octeon: Add cvmx-helper-agl.c

[Stefan Roese <sr@denx.de>]

From: Aaron Williams <awilliams@marvell.com>

Import cvmx-helper-agl.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-agl.c | 231 ++++++++++++++++++++++++
 1 file changed, 231 insertions(+)
 create mode 100644 arch/mips/mach-octeon/cvmx-helper-agl.c

diff --git a/arch/mips/mach-octeon/cvmx-helper-agl.c b/arch/mips/mach-octeon/cvmx-helper-agl.c
new file mode 100644
index 000000000000..7eb99ac7c22b
--- /dev/null
+++ b/arch/mips/mach-octeon/cvmx-helper-agl.c
@@ -0,0 +1,231 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018-2022 Marvell International Ltd.
+ *
+ * Functions for AGL (RGMII) initialization, configuration,
+ * and monitoring.
+ */
+
+#include <log.h>
+#include <time.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/cvmx-fuse.h>
+#include <mach/octeon-feature.h>
+#include <mach/cvmx-qlm.h>
+#include <mach/octeon_qlm.h>
+#include <mach/cvmx-pcie.h>
+#include <mach/cvmx-coremask.h>
+
+#include <mach/cvmx-helper.h>
+#include <mach/cvmx-helper-cfg.h>
+
+#include <mach/cvmx-agl.h>
+#include <mach/cvmx-pki.h>
+
+#include <mach/cvmx-agl-defs.h>
+#include <mach/cvmx-pko-defs.h>
+
+int __cvmx_helper_agl_enumerate(int xiface)
+{
+	if (OCTEON_IS_MODEL(OCTEON_CN70XX)) {
+		union cvmx_agl_prtx_ctl agl_prtx_ctl;
+
+		agl_prtx_ctl.u64 = csr_rd(CVMX_AGL_PRTX_CTL(0));
+		if (agl_prtx_ctl.s.mode == 0) /* RGMII */
+			return 1;
+	}
+	return 0;
+}
+
+/**
+ * @INTERNAL
+ * Convert interface to port to assess CSRs.
+ *
+ * @param xiface  Interface to probe
+ * @return  The port corresponding to the interface
+ */
+int cvmx_helper_agl_get_port(int xiface)
+{
+	struct cvmx_xiface xi = cvmx_helper_xiface_to_node_interface(xiface);
+
+	if (OCTEON_IS_MODEL(OCTEON_CN70XX))
+		return xi.interface - 4;
+	return -1;
+}
+
+/**
+ * @INTERNAL
+ * Probe a RGMII interface and determine the number of ports
+ * connected to it. The RGMII interface should still be down
+ * after this call.
+ *
+ * @param interface to probe
+ *
+ * @return Number of ports on the interface. Zero to disable.
+ */
+int __cvmx_helper_agl_probe(int interface)
+{
+	int port = cvmx_helper_agl_get_port(interface);
+	union cvmx_agl_gmx_bist gmx_bist;
+	union cvmx_agl_gmx_prtx_cfg gmx_prtx_cfg;
+	union cvmx_agl_prtx_ctl agl_prtx_ctl;
+	int result;
+
+	result = __cvmx_helper_agl_enumerate(interface);
+	if (result == 0)
+		return 0;
+
+	/* Check BIST status */
+	gmx_bist.u64 = csr_rd(CVMX_AGL_GMX_BIST);
+	if (gmx_bist.u64)
+		printf("Management port AGL failed BIST (0x%016llx) on AGL%d\n",
+		       CAST64(gmx_bist.u64), port);
+
+	/* Disable the external input/output */
+	gmx_prtx_cfg.u64 = csr_rd(CVMX_AGL_GMX_PRTX_CFG(port));
+	gmx_prtx_cfg.s.en = 0;
+	csr_wr(CVMX_AGL_GMX_PRTX_CFG(port), gmx_prtx_cfg.u64);
+
+	/* Set the rgx_ref_clk MUX with AGL_PRTx_CTL[REFCLK_SEL]. Default value
+	 * is 0 (RGMII REFCLK). Recommended to use RGMII RXC(1) or sclk/4 (2)
+	 * to save cost.
+	 */
+
+	agl_prtx_ctl.u64 = csr_rd(CVMX_AGL_PRTX_CTL(port));
+	agl_prtx_ctl.s.clkrst = 0;
+	agl_prtx_ctl.s.dllrst = 0;
+	agl_prtx_ctl.s.clktx_byp = 0;
+
+	if (OCTEON_IS_MODEL(OCTEON_CN70XX)) {
+		bool tx_enable_bypass;
+		int tx_delay;
+
+		agl_prtx_ctl.s.refclk_sel =
+			cvmx_helper_get_agl_refclk_sel(interface, port);
+		agl_prtx_ctl.s.clkrx_set =
+			cvmx_helper_get_agl_rx_clock_skew(interface, port);
+		agl_prtx_ctl.s.clkrx_byp =
+			cvmx_helper_get_agl_rx_clock_delay_bypass(interface,
+								  port);
+		cvmx_helper_cfg_get_rgmii_tx_clk_delay(
+			interface, port, &tx_enable_bypass, &tx_delay);
+		agl_prtx_ctl.s.clktx_byp = tx_enable_bypass;
+		agl_prtx_ctl.s.clktx_set = tx_delay;
+	}
+	csr_wr(CVMX_AGL_PRTX_CTL(port), agl_prtx_ctl.u64);
+	/* Force write out before wait */
+	csr_rd(CVMX_AGL_PRTX_CTL(port));
+	udelay(500);
+
+	/* Enable the componsation controller */
+	agl_prtx_ctl.u64 = csr_rd(CVMX_AGL_PRTX_CTL(port));
+	agl_prtx_ctl.s.drv_byp = 0;
+	csr_wr(CVMX_AGL_PRTX_CTL(port), agl_prtx_ctl.u64);
+	/* Force write out before wait */
+	csr_rd(CVMX_AGL_PRTX_CTL(port));
+
+	if (!OCTEON_IS_OCTEON3()) {
+		/* Enable the interface */
+		agl_prtx_ctl.u64 = csr_rd(CVMX_AGL_PRTX_CTL(port));
+		agl_prtx_ctl.s.enable = 1;
+		csr_wr(CVMX_AGL_PRTX_CTL(port), agl_prtx_ctl.u64);
+		/* Read the value back to force the previous write */
+		agl_prtx_ctl.u64 = csr_rd(CVMX_AGL_PRTX_CTL(port));
+	}
+
+	/* Enable the compensation controller */
+	agl_prtx_ctl.u64 = csr_rd(CVMX_AGL_PRTX_CTL(port));
+	agl_prtx_ctl.s.comp = 1;
+	csr_wr(CVMX_AGL_PRTX_CTL(port), agl_prtx_ctl.u64);
+	/* Force write out before wait */
+	csr_rd(CVMX_AGL_PRTX_CTL(port));
+
+	/* for componsation state to lock. */
+	udelay(500);
+
+	return result;
+}
+
+/**
+ * @INTERNAL
+ * Bringup and enable a RGMII 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_agl_enable(int interface)
+{
+	int port = cvmx_helper_agl_get_port(interface);
+	int ipd_port = cvmx_helper_get_ipd_port(interface, port);
+	union cvmx_pko_mem_port_ptrs pko_mem_port_ptrs;
+	union cvmx_pko_reg_read_idx read_idx;
+	int do_link_set = 1;
+	int i;
+
+	/* Setup PKO for AGL interface. Back pressure is not supported. */
+	pko_mem_port_ptrs.u64 = 0;
+	read_idx.u64 = 0;
+	read_idx.s.inc = 1;
+	csr_wr(CVMX_PKO_REG_READ_IDX, read_idx.u64);
+
+	for (i = 0; i < 40; i++) {
+		pko_mem_port_ptrs.u64 = csr_rd(CVMX_PKO_MEM_PORT_PTRS);
+		if (pko_mem_port_ptrs.s.pid == 24) {
+			pko_mem_port_ptrs.s.eid = 10;
+			pko_mem_port_ptrs.s.bp_port = 40;
+			csr_wr(CVMX_PKO_MEM_PORT_PTRS, pko_mem_port_ptrs.u64);
+			break;
+		}
+	}
+
+	cvmx_agl_enable(port);
+	if (do_link_set)
+		cvmx_agl_link_set(port, cvmx_agl_link_get(ipd_port));
+
+	return 0;
+}
+
+/**
+ * @INTERNAL
+ * Return the link state of an IPD/PKO port as returned by
+ * auto negotiation. The result of this function may not match
+ * Octeon's link config if auto negotiation has changed since
+ * the last call to cvmx_helper_link_set().
+ *
+ * @param ipd_port IPD/PKO port to query
+ *
+ * @return Link state
+ */
+cvmx_helper_link_info_t __cvmx_helper_agl_link_get(int ipd_port)
+{
+	return cvmx_agl_link_get(ipd_port);
+}
+
+/**
+ * @INTERNAL
+ * Configure an IPD/PKO port for the specified link state. This
+ * function does not influence auto negotiation at the PHY level.
+ * The passed link state must always match the link state returned
+ * by cvmx_helper_link_get(). It is normally best to use
+ * cvmx_helper_link_autoconf() instead.
+ *
+ * @param ipd_port  IPD/PKO port to configure
+ * @param link_info The new link state
+ *
+ * @return Zero on success, negative on failure
+ */
+int __cvmx_helper_agl_link_set(int ipd_port, cvmx_helper_link_info_t link_info)
+{
+	int interface = cvmx_helper_get_interface_num(ipd_port);
+	int port = cvmx_helper_agl_get_port(interface);
+
+	return cvmx_agl_link_set(port, link_info);
+}
-- 
2.35.1