[PATCH 24/52] mips: octeon: Add cvmx-agl.c

[Stefan Roese <sr@denx.de>]

From: Aaron Williams <awilliams@marvell.com>

Import cvmx-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-agl.c | 216 +++++++++++++++++++++++++++++++
 1 file changed, 216 insertions(+)
 create mode 100644 arch/mips/mach-octeon/cvmx-agl.c

diff --git a/arch/mips/mach-octeon/cvmx-agl.c b/arch/mips/mach-octeon/cvmx-agl.c
new file mode 100644
index 000000000000..9eea857e47c7
--- /dev/null
+++ b/arch/mips/mach-octeon/cvmx-agl.c
@@ -0,0 +1,216 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018-2022 Marvell International Ltd.
+ *
+ * Functions for RGMII (MGMT) 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-pki.h>
+#include <mach/cvmx-helper.h>
+#include <mach/cvmx-helper-board.h>
+#include <mach/cvmx-helper-cfg.h>
+
+#include <mach/cvmx-agl.h>
+#include <mach/cvmx-agl-defs.h>
+
+/*
+ * @param port to enable
+ *
+ * @return Zero on success, negative on failure
+ */
+int cvmx_agl_enable(int port)
+{
+	cvmx_agl_gmx_rxx_frm_ctl_t rxx_frm_ctl;
+
+	rxx_frm_ctl.u64 = 0;
+	rxx_frm_ctl.s.pre_align = 1;
+	/* When set, disables the length check for non-min sized pkts with
+	 * padding in the client data
+	 */
+	rxx_frm_ctl.s.pad_len = 1;
+	/* When set, disables the length check for VLAN pkts */
+	rxx_frm_ctl.s.vlan_len = 1;
+	/* When set, PREAMBLE checking is  less strict */
+	rxx_frm_ctl.s.pre_free = 1;
+	/* Control Pause Frames can match station SMAC */
+	rxx_frm_ctl.s.ctl_smac = 0;
+	/* Control Pause Frames can match globally assign Multicast address */
+	rxx_frm_ctl.s.ctl_mcst = 1;
+	rxx_frm_ctl.s.ctl_bck = 1;  /* Forward pause information to TX block */
+	rxx_frm_ctl.s.ctl_drp = 1;  /* Drop Control Pause Frames */
+	rxx_frm_ctl.s.pre_strp = 1; /* Strip off the preamble */
+	/* This port is configured to send PREAMBLE+SFD to begin every frame.
+	 * GMX checks that the PREAMBLE is sent correctly
+	 */
+	rxx_frm_ctl.s.pre_chk = 1;
+	csr_wr(CVMX_AGL_GMX_RXX_FRM_CTL(port), rxx_frm_ctl.u64);
+
+	return 0;
+}
+
+cvmx_helper_link_info_t cvmx_agl_link_get(int port)
+{
+	cvmx_helper_link_info_t result;
+	int interface, port_index;
+
+	/* Fake IPD port is used on some older models. */
+	if (port < 0)
+		return __cvmx_helper_board_link_get(port);
+
+	/* Simulator does not have PHY, use some defaults. */
+	interface = cvmx_helper_get_interface_num(port);
+	port_index = cvmx_helper_get_interface_index_num(port);
+	if (cvmx_helper_get_port_force_link_up(interface, port_index)) {
+		result.u64 = 0;
+		result.s.full_duplex = 1;
+		result.s.link_up = 1;
+		result.s.speed = 1000;
+		return result;
+	}
+
+	return __cvmx_helper_board_link_get(port);
+}
+
+/*
+ * Set MII/RGMII link based on mode.
+ *
+ * @param port   interface port to set the link.
+ * @param link_info  Link status
+ *
+ * @return       0 on success and 1 on failure
+ */
+int cvmx_agl_link_set(int port, cvmx_helper_link_info_t link_info)
+{
+	cvmx_agl_gmx_prtx_cfg_t agl_gmx_prtx;
+
+	/* Disable GMX before we make any changes. */
+	agl_gmx_prtx.u64 = csr_rd(CVMX_AGL_GMX_PRTX_CFG(port));
+	agl_gmx_prtx.s.en = 0;
+	agl_gmx_prtx.s.tx_en = 0;
+	agl_gmx_prtx.s.rx_en = 0;
+	csr_wr(CVMX_AGL_GMX_PRTX_CFG(port), agl_gmx_prtx.u64);
+
+	if (OCTEON_IS_MODEL(OCTEON_CN6XXX) || OCTEON_IS_OCTEON3()) {
+		u64 one_second = 0x1000000; /* todo: this needs checking */
+
+		/* Wait for GMX to be idle */
+		if (CVMX_WAIT_FOR_FIELD64(CVMX_AGL_GMX_PRTX_CFG(port),
+					  cvmx_agl_gmx_prtx_cfg_t, rx_idle, ==,
+					  1, one_second) ||
+		    CVMX_WAIT_FOR_FIELD64(CVMX_AGL_GMX_PRTX_CFG(port),
+					  cvmx_agl_gmx_prtx_cfg_t, tx_idle, ==,
+					  1, one_second)) {
+			debug("AGL%d: Timeout waiting for GMX to be idle\n",
+			      port);
+			return -1;
+		}
+	}
+
+	agl_gmx_prtx.u64 = csr_rd(CVMX_AGL_GMX_PRTX_CFG(port));
+
+	/* Set duplex mode */
+	if (!link_info.s.link_up)
+		agl_gmx_prtx.s.duplex = 1; /* Force full duplex on down links */
+	else
+		agl_gmx_prtx.s.duplex = link_info.s.full_duplex;
+
+	switch (link_info.s.speed) {
+	case 10:
+		agl_gmx_prtx.s.speed = 0;
+		agl_gmx_prtx.s.slottime = 0;
+		if (OCTEON_IS_MODEL(OCTEON_CN6XXX) || OCTEON_IS_OCTEON3()) {
+			agl_gmx_prtx.s.speed_msb = 1;
+			agl_gmx_prtx.s.burst = 1;
+		}
+		break;
+
+	case 100:
+		agl_gmx_prtx.s.speed = 0;
+		agl_gmx_prtx.s.slottime = 0;
+		if (OCTEON_IS_MODEL(OCTEON_CN6XXX) || OCTEON_IS_OCTEON3()) {
+			agl_gmx_prtx.s.speed_msb = 0;
+			agl_gmx_prtx.s.burst = 1;
+		}
+		break;
+
+	case 1000:
+		/* 1000 MBits is only supported on 6XXX chips */
+		if (OCTEON_IS_MODEL(OCTEON_CN6XXX) || OCTEON_IS_OCTEON3()) {
+			agl_gmx_prtx.s.speed_msb = 0;
+			agl_gmx_prtx.s.speed = 1;
+			agl_gmx_prtx.s.slottime =
+				1; /* Only matters for half-duplex */
+			agl_gmx_prtx.s.burst = agl_gmx_prtx.s.duplex;
+		}
+		break;
+
+		/* No link */
+	case 0:
+	default:
+		break;
+	}
+
+	/* Write the new GMX setting with the port still disabled. */
+	csr_wr(CVMX_AGL_GMX_PRTX_CFG(port), agl_gmx_prtx.u64);
+
+	/* Read GMX CFG again to make sure the config is completed. */
+	agl_gmx_prtx.u64 = csr_rd(CVMX_AGL_GMX_PRTX_CFG(port));
+
+	if (OCTEON_IS_MODEL(OCTEON_CN6XXX) || OCTEON_IS_OCTEON3()) {
+		cvmx_agl_gmx_txx_clk_t agl_clk;
+		cvmx_agl_prtx_ctl_t prt_ctl;
+
+		prt_ctl.u64 = csr_rd(CVMX_AGL_PRTX_CTL(port));
+		agl_clk.u64 = csr_rd(CVMX_AGL_GMX_TXX_CLK(port));
+		/* MII (both speeds) and RGMII 1000 setting */
+		agl_clk.s.clk_cnt = 1;
+		/* Check other speeds for RGMII mode */
+		if (prt_ctl.s.mode == 0 || OCTEON_IS_OCTEON3()) {
+			if (link_info.s.speed == 10)
+				agl_clk.s.clk_cnt = 50;
+			else if (link_info.s.speed == 100)
+				agl_clk.s.clk_cnt = 5;
+		}
+		csr_wr(CVMX_AGL_GMX_TXX_CLK(port), agl_clk.u64);
+	}
+
+	/* Enable transmit and receive ports */
+	agl_gmx_prtx.s.tx_en = 1;
+	agl_gmx_prtx.s.rx_en = 1;
+	csr_wr(CVMX_AGL_GMX_PRTX_CFG(port), agl_gmx_prtx.u64);
+
+	/* Enable the link. */
+	agl_gmx_prtx.s.en = 1;
+	csr_wr(CVMX_AGL_GMX_PRTX_CFG(port), agl_gmx_prtx.u64);
+
+	if (OCTEON_IS_OCTEON3()) {
+		union cvmx_agl_prtx_ctl agl_prtx_ctl;
+		/* Enable the interface, set clkrst */
+		agl_prtx_ctl.u64 = csr_rd(CVMX_AGL_PRTX_CTL(port));
+		agl_prtx_ctl.s.clkrst = 1;
+		csr_wr(CVMX_AGL_PRTX_CTL(port), 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 */
+		csr_rd(CVMX_AGL_PRTX_CTL(port));
+	}
+
+	return 0;
+}
-- 
2.35.1