1 files changed, 457 insertions, 0 deletions
diff --git a/drivers/net/ethernet/ti/icssg/icssg_config.c b/drivers/net/ethernet/ti/icssg/icssg_config.c
new file mode 100644
index 000000000000..933b84666574
--- /dev/null
+++ b/drivers/net/ethernet/ti/icssg/icssg_config.c
@@ -0,0 +1,457 @@
+// SPDX-License-Identifier: GPL-2.0
+/* ICSSG Ethernet driver
+ *
+ * Copyright (C) 2022 Texas Instruments Incorporated - https://www.ti.com
+ */
+
+#include <linux/iopoll.h>
+#include <linux/regmap.h>
+#include <uapi/linux/if_ether.h>
+#include "icssg_config.h"
+#include "icssg_prueth.h"
+#include "icssg_switch_map.h"
+#include "icssg_mii_rt.h"
+
+/* TX IPG Values to be set for 100M link speed. These values are
+ * in ocp_clk cycles. So need change if ocp_clk is changed for a specific
+ * h/w design.
+ */
+
+/* IPG is in core_clk cycles */
+#define MII_RT_TX_IPG_100M	0x17
+#define MII_RT_TX_IPG_1G	0xb
+
+#define	ICSSG_QUEUES_MAX		64
+#define	ICSSG_QUEUE_OFFSET		0xd00
+#define	ICSSG_QUEUE_PEEK_OFFSET		0xe00
+#define	ICSSG_QUEUE_CNT_OFFSET		0xe40
+#define	ICSSG_QUEUE_RESET_OFFSET	0xf40
+
+#define	ICSSG_NUM_TX_QUEUES	8
+
+#define	RECYCLE_Q_SLICE0	16
+#define	RECYCLE_Q_SLICE1	17
+
+#define	ICSSG_NUM_OTHER_QUEUES	5	/* port, host and special queues */
+
+#define	PORT_HI_Q_SLICE0	32
+#define	PORT_LO_Q_SLICE0	33
+#define	HOST_HI_Q_SLICE0	34
+#define	HOST_LO_Q_SLICE0	35
+#define	HOST_SPL_Q_SLICE0	40	/* Special Queue */
+
+#define	PORT_HI_Q_SLICE1	36
+#define	PORT_LO_Q_SLICE1	37
+#define	HOST_HI_Q_SLICE1	38
+#define	HOST_LO_Q_SLICE1	39
+#define	HOST_SPL_Q_SLICE1	41	/* Special Queue */
+
+#define MII_RXCFG_DEFAULT	(PRUSS_MII_RT_RXCFG_RX_ENABLE | \
+				 PRUSS_MII_RT_RXCFG_RX_DATA_RDY_MODE_DIS | \
+				 PRUSS_MII_RT_RXCFG_RX_L2_EN | \
+				 PRUSS_MII_RT_RXCFG_RX_L2_EOF_SCLR_DIS)
+
+#define MII_TXCFG_DEFAULT	(PRUSS_MII_RT_TXCFG_TX_ENABLE | \
+				 PRUSS_MII_RT_TXCFG_TX_AUTO_PREAMBLE | \
+				 PRUSS_MII_RT_TXCFG_TX_32_MODE_EN | \
+				 PRUSS_MII_RT_TXCFG_TX_IPG_WIRE_CLK_EN)
+
+#define ICSSG_CFG_DEFAULT	(ICSSG_CFG_TX_L1_EN | \
+				 ICSSG_CFG_TX_L2_EN | ICSSG_CFG_RX_L2_G_EN | \
+				 ICSSG_CFG_TX_PRU_EN | \
+				 ICSSG_CFG_SGMII_MODE)
+
+#define FDB_GEN_CFG1		0x60
+#define SMEM_VLAN_OFFSET	8
+#define SMEM_VLAN_OFFSET_MASK	GENMASK(25, 8)
+
+#define FDB_GEN_CFG2		0x64
+#define FDB_VLAN_EN		BIT(6)
+#define FDB_HOST_EN		BIT(2)
+#define FDB_PRU1_EN		BIT(1)
+#define FDB_PRU0_EN		BIT(0)
+#define FDB_EN_ALL		(FDB_PRU0_EN | FDB_PRU1_EN | \
+				 FDB_HOST_EN | FDB_VLAN_EN)
+
+/**
+ * struct map - ICSSG Queue Map
+ * @queue: Queue number
+ * @pd_addr_start: Packet descriptor queue reserved memory
+ * @flags: Flags
+ * @special: Indicates whether this queue is a special queue or not
+ */
+struct map {
+	int queue;
+	u32 pd_addr_start;
+	u32 flags;
+	bool special;
+};
+
+/* Hardware queue map for ICSSG */
+static const struct map hwq_map[2][ICSSG_NUM_OTHER_QUEUES] = {
+	{
+		{ PORT_HI_Q_SLICE0, PORT_DESC0_HI, 0x200000, 0 },
+		{ PORT_LO_Q_SLICE0, PORT_DESC0_LO, 0, 0 },
+		{ HOST_HI_Q_SLICE0, HOST_DESC0_HI, 0x200000, 0 },
+		{ HOST_LO_Q_SLICE0, HOST_DESC0_LO, 0, 0 },
+		{ HOST_SPL_Q_SLICE0, HOST_SPPD0, 0x400000, 1 },
+	},
+	{
+		{ PORT_HI_Q_SLICE1, PORT_DESC1_HI, 0xa00000, 0 },
+		{ PORT_LO_Q_SLICE1, PORT_DESC1_LO, 0x800000, 0 },
+		{ HOST_HI_Q_SLICE1, HOST_DESC1_HI, 0xa00000, 0 },
+		{ HOST_LO_Q_SLICE1, HOST_DESC1_LO, 0x800000, 0 },
+		{ HOST_SPL_Q_SLICE1, HOST_SPPD1, 0xc00000, 1 },
+	},
+};
+
+static void icssg_config_mii_init(struct prueth_emac *emac)
+{
+	u32 rxcfg, txcfg, rxcfg_reg, txcfg_reg, pcnt_reg;
+	struct prueth *prueth = emac->prueth;
+	int slice = prueth_emac_slice(emac);
+	struct regmap *mii_rt;
+
+	mii_rt = prueth->mii_rt;
+
+	rxcfg_reg = (slice == ICSS_MII0) ? PRUSS_MII_RT_RXCFG0 :
+				       PRUSS_MII_RT_RXCFG1;
+	txcfg_reg = (slice == ICSS_MII0) ? PRUSS_MII_RT_TXCFG0 :
+				       PRUSS_MII_RT_TXCFG1;
+	pcnt_reg = (slice == ICSS_MII0) ? PRUSS_MII_RT_RX_PCNT0 :
+				       PRUSS_MII_RT_RX_PCNT1;
+
+	rxcfg = MII_RXCFG_DEFAULT;
+	txcfg = MII_TXCFG_DEFAULT;
+
+	if (slice == ICSS_MII1)
+		rxcfg |= PRUSS_MII_RT_RXCFG_RX_MUX_SEL;
+
+	/* In MII mode TX lines swapped inside ICSSG, so TX_MUX_SEL cfg need
+	 * to be swapped also comparing to RGMII mode.
+	 */
+	if (emac->phy_if == PHY_INTERFACE_MODE_MII && slice == ICSS_MII0)
+		txcfg |= PRUSS_MII_RT_TXCFG_TX_MUX_SEL;
+	else if (emac->phy_if != PHY_INTERFACE_MODE_MII && slice == ICSS_MII1)
+		txcfg |= PRUSS_MII_RT_TXCFG_TX_MUX_SEL;
+
+	regmap_write(mii_rt, rxcfg_reg, rxcfg);
+	regmap_write(mii_rt, txcfg_reg, txcfg);
+	regmap_write(mii_rt, pcnt_reg, 0x1);
+}
+
+static void icssg_miig_queues_init(struct prueth *prueth, int slice)
+{
+	struct regmap *miig_rt = prueth->miig_rt;
+	void __iomem *smem = prueth->shram.va;
+	u8 pd[ICSSG_SPECIAL_PD_SIZE];
+	int queue = 0, i, j;
+	u32 *pdword;
+
+	/* reset hwqueues */
+	if (slice)
+		queue = ICSSG_NUM_TX_QUEUES;
+
+	for (i = 0; i < ICSSG_NUM_TX_QUEUES; i++) {
+		regmap_write(miig_rt, ICSSG_QUEUE_RESET_OFFSET, queue);
+		queue++;
+	}
+
+	queue = slice ? RECYCLE_Q_SLICE1 : RECYCLE_Q_SLICE0;
+	regmap_write(miig_rt, ICSSG_QUEUE_RESET_OFFSET, queue);
+
+	for (i = 0; i < ICSSG_NUM_OTHER_QUEUES; i++) {
+		regmap_write(miig_rt, ICSSG_QUEUE_RESET_OFFSET,
+			     hwq_map[slice][i].queue);
+	}
+
+	/* initialize packet descriptors in SMEM */
+	/* push pakcet descriptors to hwqueues */
+
+	pdword = (u32 *)pd;
+	for (j = 0; j < ICSSG_NUM_OTHER_QUEUES; j++) {
+		const struct map *mp;
+		int pd_size, num_pds;
+		u32 pdaddr;
+
+		mp = &hwq_map[slice][j];
+		if (mp->special) {
+			pd_size = ICSSG_SPECIAL_PD_SIZE;
+			num_pds = ICSSG_NUM_SPECIAL_PDS;
+		} else	{
+			pd_size = ICSSG_NORMAL_PD_SIZE;
+			num_pds = ICSSG_NUM_NORMAL_PDS;
+		}
+
+		for (i = 0; i < num_pds; i++) {
+			memset(pd, 0, pd_size);
+
+			pdword[0] &= ICSSG_FLAG_MASK;
+			pdword[0] |= mp->flags;
+			pdaddr = mp->pd_addr_start + i * pd_size;
+
+			memcpy_toio(smem + pdaddr, pd, pd_size);
+			queue = mp->queue;
+			regmap_write(miig_rt, ICSSG_QUEUE_OFFSET + 4 * queue,
+				     pdaddr);
+		}
+	}
+}
+
+void icssg_config_ipg(struct prueth_emac *emac)
+{
+	struct prueth *prueth = emac->prueth;
+	int slice = prueth_emac_slice(emac);
+
+	switch (emac->speed) {
+	case SPEED_1000:
+		icssg_mii_update_ipg(prueth->mii_rt, slice, MII_RT_TX_IPG_1G);
+		break;
+	case SPEED_100:
+		icssg_mii_update_ipg(prueth->mii_rt, slice, MII_RT_TX_IPG_100M);
+		break;
+	case SPEED_10:
+		/* IPG for 10M is same as 100M */
+		icssg_mii_update_ipg(prueth->mii_rt, slice, MII_RT_TX_IPG_100M);
+		break;
+	default:
+		/* Other links speeds not supported */
+		netdev_err(emac->ndev, "Unsupported link speed\n");
+		return;
+	}
+}
+
+static void emac_r30_cmd_init(struct prueth_emac *emac)
+{
+	struct icssg_r30_cmd __iomem *p;
+	int i;
+
+	p = emac->dram.va + MGR_R30_CMD_OFFSET;
+
+	for (i = 0; i < 4; i++)
+		writel(EMAC_NONE, &p->cmd[i]);
+}
+
+static int emac_r30_is_done(struct prueth_emac *emac)
+{
+	const struct icssg_r30_cmd __iomem *p;
+	u32 cmd;
+	int i;
+
+	p = emac->dram.va + MGR_R30_CMD_OFFSET;
+
+	for (i = 0; i < 4; i++) {
+		cmd = readl(&p->cmd[i]);
+		if (cmd != EMAC_NONE)
+			return 0;
+	}
+
+	return 1;
+}
+
+static int prueth_emac_buffer_setup(struct prueth_emac *emac)
+{
+	struct icssg_buffer_pool_cfg __iomem *bpool_cfg;
+	struct icssg_rxq_ctx __iomem *rxq_ctx;
+	struct prueth *prueth = emac->prueth;
+	int slice = prueth_emac_slice(emac);
+	u32 addr;
+	int i;
+
+	/* Layout to have 64KB aligned buffer pool
+	 * |BPOOL0|BPOOL1|RX_CTX0|RX_CTX1|
+	 */
+
+	addr = lower_32_bits(prueth->msmcram.pa);
+	if (slice)
+		addr += PRUETH_NUM_BUF_POOLS * PRUETH_EMAC_BUF_POOL_SIZE;
+
+	if (addr % SZ_64K) {
+		dev_warn(prueth->dev, "buffer pool needs to be 64KB aligned\n");
+		return -EINVAL;
+	}
+
+	bpool_cfg = emac->dram.va + BUFFER_POOL_0_ADDR_OFFSET;
+	/* workaround for f/w bug. bpool 0 needs to be initilalized */
+	writel(addr, &bpool_cfg[0].addr);
+	writel(0, &bpool_cfg[0].len);
+
+	for (i = PRUETH_EMAC_BUF_POOL_START;
+	     i < PRUETH_EMAC_BUF_POOL_START + PRUETH_NUM_BUF_POOLS;
+	     i++) {
+		writel(addr, &bpool_cfg[i].addr);
+		writel(PRUETH_EMAC_BUF_POOL_SIZE, &bpool_cfg[i].len);
+		addr += PRUETH_EMAC_BUF_POOL_SIZE;
+	}
+
+	if (!slice)
+		addr += PRUETH_NUM_BUF_POOLS * PRUETH_EMAC_BUF_POOL_SIZE;
+	else
+		addr += PRUETH_EMAC_RX_CTX_BUF_SIZE * 2;
+
+	/* Pre-emptible RX buffer queue */
+	rxq_ctx = emac->dram.va + HOST_RX_Q_PRE_CONTEXT_OFFSET;
+	for (i = 0; i < 3; i++)
+		writel(addr, &rxq_ctx->start[i]);
+
+	addr += PRUETH_EMAC_RX_CTX_BUF_SIZE;
+	writel(addr, &rxq_ctx->end);
+
+	/* Express RX buffer queue */
+	rxq_ctx = emac->dram.va + HOST_RX_Q_EXP_CONTEXT_OFFSET;
+	for (i = 0; i < 3; i++)
+		writel(addr, &rxq_ctx->start[i]);
+
+	addr += PRUETH_EMAC_RX_CTX_BUF_SIZE;
+	writel(addr, &rxq_ctx->end);
+
+	return 0;
+}
+
+static void icssg_init_emac_mode(struct prueth *prueth)
+{
+	/* When the device is configured as a bridge and it is being brought
+	 * back to the emac mode, the host mac address has to be set as 0.
+	 */
+	u8 mac[ETH_ALEN] = { 0 };
+
+	if (prueth->emacs_initialized)
+		return;
+
+	regmap_update_bits(prueth->miig_rt, FDB_GEN_CFG1,
+			   SMEM_VLAN_OFFSET_MASK, 0);
+	regmap_write(prueth->miig_rt, FDB_GEN_CFG2, 0);
+	/* Clear host MAC address */
+	icssg_class_set_host_mac_addr(prueth->miig_rt, mac);
+}
+
+int icssg_config(struct prueth *prueth, struct prueth_emac *emac, int slice)
+{
+	void __iomem *config = emac->dram.va + ICSSG_CONFIG_OFFSET;
+	struct icssg_flow_cfg __iomem *flow_cfg;
+	int ret;
+
+	icssg_init_emac_mode(prueth);
+
+	memset_io(config, 0, TAS_GATE_MASK_LIST0);
+	icssg_miig_queues_init(prueth, slice);
+
+	emac->speed = SPEED_1000;
+	emac->duplex = DUPLEX_FULL;
+	if (!phy_interface_mode_is_rgmii(emac->phy_if)) {
+		emac->speed = SPEED_100;
+		emac->duplex = DUPLEX_FULL;
+	}
+	regmap_update_bits(prueth->miig_rt, ICSSG_CFG_OFFSET,
+			   ICSSG_CFG_DEFAULT, ICSSG_CFG_DEFAULT);
+	icssg_miig_set_interface_mode(prueth->miig_rt, slice, emac->phy_if);
+	icssg_config_mii_init(emac);
+	icssg_config_ipg(emac);
+	icssg_update_rgmii_cfg(prueth->miig_rt, emac);
+
+	/* set GPI mode */
+	pruss_cfg_gpimode(prueth->pruss, prueth->pru_id[slice],
+			  PRUSS_GPI_MODE_MII);
+
+	/* enable XFR shift for PRU and RTU */
+	pruss_cfg_xfr_enable(prueth->pruss, PRU_TYPE_PRU, true);
+	pruss_cfg_xfr_enable(prueth->pruss, PRU_TYPE_RTU, true);
+
+	/* set C28 to 0x100 */
+	pru_rproc_set_ctable(prueth->pru[slice], PRU_C28, 0x100 << 8);
+	pru_rproc_set_ctable(prueth->rtu[slice], PRU_C28, 0x100 << 8);
+	pru_rproc_set_ctable(prueth->txpru[slice], PRU_C28, 0x100 << 8);
+
+	flow_cfg = config + PSI_L_REGULAR_FLOW_ID_BASE_OFFSET;
+	writew(emac->rx_flow_id_base, &flow_cfg->rx_base_flow);
+	writew(0, &flow_cfg->mgm_base_flow);
+	writeb(0, config + SPL_PKT_DEFAULT_PRIORITY);
+	writeb(0, config + QUEUE_NUM_UNTAGGED);
+
+	ret = prueth_emac_buffer_setup(emac);
+	if (ret)
+		return ret;
+
+	emac_r30_cmd_init(emac);
+
+	return 0;
+}
+
+/* Bitmask for ICSSG r30 commands */
+static const struct icssg_r30_cmd emac_r32_bitmask[] = {
+	{{0xffff0004, 0xffff0100, 0xffff0100, EMAC_NONE}},	/* EMAC_PORT_DISABLE */
+	{{0xfffb0040, 0xfeff0200, 0xfeff0200, EMAC_NONE}},	/* EMAC_PORT_BLOCK */
+	{{0xffbb0000, 0xfcff0000, 0xdcff0000, EMAC_NONE}},	/* EMAC_PORT_FORWARD */
+	{{0xffbb0000, 0xfcff0000, 0xfcff2000, EMAC_NONE}},	/* EMAC_PORT_FORWARD_WO_LEARNING */
+	{{0xffff0001, EMAC_NONE,  EMAC_NONE, EMAC_NONE}},	/* ACCEPT ALL */
+	{{0xfffe0002, EMAC_NONE,  EMAC_NONE, EMAC_NONE}},	/* ACCEPT TAGGED */
+	{{0xfffc0000, EMAC_NONE,  EMAC_NONE, EMAC_NONE}},	/* ACCEPT UNTAGGED and PRIO */
+	{{EMAC_NONE,  0xffff0020, EMAC_NONE, EMAC_NONE}},	/* TAS Trigger List change */
+	{{EMAC_NONE,  0xdfff1000, EMAC_NONE, EMAC_NONE}},	/* TAS set state ENABLE*/
+	{{EMAC_NONE,  0xefff2000, EMAC_NONE, EMAC_NONE}},	/* TAS set state RESET*/
+	{{EMAC_NONE,  0xcfff0000, EMAC_NONE, EMAC_NONE}},	/* TAS set state DISABLE*/
+	{{EMAC_NONE,  EMAC_NONE,  0xffff0400, EMAC_NONE}},	/* UC flooding ENABLE*/
+	{{EMAC_NONE,  EMAC_NONE,  0xfbff0000, EMAC_NONE}},	/* UC flooding DISABLE*/
+	{{EMAC_NONE,  EMAC_NONE,  0xffff0800, EMAC_NONE}},	/* MC flooding ENABLE*/
+	{{EMAC_NONE,  EMAC_NONE,  0xf7ff0000, EMAC_NONE}},	/* MC flooding DISABLE*/
+	{{EMAC_NONE,  0xffff4000, EMAC_NONE, EMAC_NONE}},	/* Preemption on Tx ENABLE*/
+	{{EMAC_NONE,  0xbfff0000, EMAC_NONE, EMAC_NONE}},	/* Preemption on Tx DISABLE*/
+	{{0xffff0010,  EMAC_NONE, 0xffff0010, EMAC_NONE}},	/* VLAN AWARE*/
+	{{0xffef0000,  EMAC_NONE, 0xffef0000, EMAC_NONE}}	/* VLAN UNWARE*/
+};
+
+int emac_set_port_state(struct prueth_emac *emac,
+			enum icssg_port_state_cmd cmd)
+{
+	struct icssg_r30_cmd __iomem *p;
+	int ret = -ETIMEDOUT;
+	int done = 0;
+	int i;
+
+	p = emac->dram.va + MGR_R30_CMD_OFFSET;
+
+	if (cmd >= ICSSG_EMAC_PORT_MAX_COMMANDS) {
+		netdev_err(emac->ndev, "invalid port command\n");
+		return -EINVAL;
+	}
+
+	/* only one command at a time allowed to firmware */
+	mutex_lock(&emac->cmd_lock);
+
+	for (i = 0; i < 4; i++)
+		writel(emac_r32_bitmask[cmd].cmd[i], &p->cmd[i]);
+
+	/* wait for done */
+	ret = read_poll_timeout(emac_r30_is_done, done, done == 1,
+				1000, 10000, false, emac);
+
+	if (ret == -ETIMEDOUT)
+		netdev_err(emac->ndev, "timeout waiting for command done\n");
+
+	mutex_unlock(&emac->cmd_lock);
+
+	return ret;
+}
+
+void icssg_config_set_speed(struct prueth_emac *emac)
+{
+	u8 fw_speed;
+
+	switch (emac->speed) {
+	case SPEED_1000:
+		fw_speed = FW_LINK_SPEED_1G;
+		break;
+	case SPEED_100:
+		fw_speed = FW_LINK_SPEED_100M;
+		break;
+	case SPEED_10:
+		fw_speed = FW_LINK_SPEED_10M;
+		break;
+	default:
+		/* Other links speeds not supported */
+		netdev_err(emac->ndev, "Unsupported link speed\n");
+		return;
+	}
+
+	writeb(fw_speed, emac->dram.va + PORT_LINK_SPEED_OFFSET);
+}