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linux/drivers/net/dsa/sja1105/sja1105_clocking.c

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// SPDX-License-Identifier: BSD-3-Clause
/* Copyright (c) 2016-2018, NXP Semiconductors
* Copyright (c) 2018-2019, Vladimir Oltean <olteanv@gmail.com>
*/
#include <linux/packing.h>
#include "sja1105.h"
#define SJA1105_SIZE_CGU_CMD 4
/* Common structure for CFG_PAD_MIIx_RX and CFG_PAD_MIIx_TX */
struct sja1105_cfg_pad_mii {
u64 d32_os;
u64 d32_ih;
u64 d32_ipud;
u64 d10_ih;
u64 d10_os;
u64 d10_ipud;
u64 ctrl_os;
u64 ctrl_ih;
u64 ctrl_ipud;
u64 clk_os;
u64 clk_ih;
u64 clk_ipud;
};
struct sja1105_cfg_pad_mii_id {
u64 rxc_stable_ovr;
u64 rxc_delay;
u64 rxc_bypass;
u64 rxc_pd;
u64 txc_stable_ovr;
u64 txc_delay;
u64 txc_bypass;
u64 txc_pd;
};
/* UM10944 Table 82.
* IDIV_0_C to IDIV_4_C control registers
* (addr. 10000Bh to 10000Fh)
*/
struct sja1105_cgu_idiv {
u64 clksrc;
u64 autoblock;
u64 idiv;
u64 pd;
};
/* PLL_1_C control register
*
* SJA1105 E/T: UM10944 Table 81 (address 10000Ah)
* SJA1105 P/Q/R/S: UM11040 Table 116 (address 10000Ah)
*/
struct sja1105_cgu_pll_ctrl {
u64 pllclksrc;
u64 msel;
u64 autoblock;
u64 psel;
u64 direct;
u64 fbsel;
u64 bypass;
u64 pd;
};
enum {
CLKSRC_MII0_TX_CLK = 0x00,
CLKSRC_MII0_RX_CLK = 0x01,
CLKSRC_MII1_TX_CLK = 0x02,
CLKSRC_MII1_RX_CLK = 0x03,
CLKSRC_MII2_TX_CLK = 0x04,
CLKSRC_MII2_RX_CLK = 0x05,
CLKSRC_MII3_TX_CLK = 0x06,
CLKSRC_MII3_RX_CLK = 0x07,
CLKSRC_MII4_TX_CLK = 0x08,
CLKSRC_MII4_RX_CLK = 0x09,
CLKSRC_PLL0 = 0x0B,
CLKSRC_PLL1 = 0x0E,
CLKSRC_IDIV0 = 0x11,
CLKSRC_IDIV1 = 0x12,
CLKSRC_IDIV2 = 0x13,
CLKSRC_IDIV3 = 0x14,
CLKSRC_IDIV4 = 0x15,
};
/* UM10944 Table 83.
* MIIx clock control registers 1 to 30
* (addresses 100013h to 100035h)
*/
struct sja1105_cgu_mii_ctrl {
u64 clksrc;
u64 autoblock;
u64 pd;
};
static void sja1105_cgu_idiv_packing(void *buf, struct sja1105_cgu_idiv *idiv,
enum packing_op op)
{
const int size = 4;
sja1105_packing(buf, &idiv->clksrc, 28, 24, size, op);
sja1105_packing(buf, &idiv->autoblock, 11, 11, size, op);
sja1105_packing(buf, &idiv->idiv, 5, 2, size, op);
sja1105_packing(buf, &idiv->pd, 0, 0, size, op);
}
static int sja1105_cgu_idiv_config(struct sja1105_private *priv, int port,
bool enabled, int factor)
{
const struct sja1105_regs *regs = priv->info->regs;
struct device *dev = priv->ds->dev;
struct sja1105_cgu_idiv idiv;
u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
if (enabled && factor != 1 && factor != 10) {
dev_err(dev, "idiv factor must be 1 or 10\n");
return -ERANGE;
}
/* Payload for packed_buf */
idiv.clksrc = 0x0A; /* 25MHz */
idiv.autoblock = 1; /* Block clk automatically */
idiv.idiv = factor - 1; /* Divide by 1 or 10 */
idiv.pd = enabled ? 0 : 1; /* Power down? */
sja1105_cgu_idiv_packing(packed_buf, &idiv, PACK);
return sja1105_xfer_buf(priv, SPI_WRITE, regs->cgu_idiv[port],
packed_buf, SJA1105_SIZE_CGU_CMD);
}
static void
sja1105_cgu_mii_control_packing(void *buf, struct sja1105_cgu_mii_ctrl *cmd,
enum packing_op op)
{
const int size = 4;
sja1105_packing(buf, &cmd->clksrc, 28, 24, size, op);
sja1105_packing(buf, &cmd->autoblock, 11, 11, size, op);
sja1105_packing(buf, &cmd->pd, 0, 0, size, op);
}
static int sja1105_cgu_mii_tx_clk_config(struct sja1105_private *priv,
int port, sja1105_mii_role_t role)
{
const struct sja1105_regs *regs = priv->info->regs;
struct sja1105_cgu_mii_ctrl mii_tx_clk;
const int mac_clk_sources[] = {
CLKSRC_MII0_TX_CLK,
CLKSRC_MII1_TX_CLK,
CLKSRC_MII2_TX_CLK,
CLKSRC_MII3_TX_CLK,
CLKSRC_MII4_TX_CLK,
};
const int phy_clk_sources[] = {
CLKSRC_IDIV0,
CLKSRC_IDIV1,
CLKSRC_IDIV2,
CLKSRC_IDIV3,
CLKSRC_IDIV4,
};
u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
int clksrc;
if (role == XMII_MAC)
clksrc = mac_clk_sources[port];
else
clksrc = phy_clk_sources[port];
/* Payload for packed_buf */
mii_tx_clk.clksrc = clksrc;
mii_tx_clk.autoblock = 1; /* Autoblock clk while changing clksrc */
mii_tx_clk.pd = 0; /* Power Down off => enabled */
sja1105_cgu_mii_control_packing(packed_buf, &mii_tx_clk, PACK);
return sja1105_xfer_buf(priv, SPI_WRITE, regs->mii_tx_clk[port],
packed_buf, SJA1105_SIZE_CGU_CMD);
}
static int
sja1105_cgu_mii_rx_clk_config(struct sja1105_private *priv, int port)
{
const struct sja1105_regs *regs = priv->info->regs;
struct sja1105_cgu_mii_ctrl mii_rx_clk;
u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
const int clk_sources[] = {
CLKSRC_MII0_RX_CLK,
CLKSRC_MII1_RX_CLK,
CLKSRC_MII2_RX_CLK,
CLKSRC_MII3_RX_CLK,
CLKSRC_MII4_RX_CLK,
};
/* Payload for packed_buf */
mii_rx_clk.clksrc = clk_sources[port];
mii_rx_clk.autoblock = 1; /* Autoblock clk while changing clksrc */
mii_rx_clk.pd = 0; /* Power Down off => enabled */
sja1105_cgu_mii_control_packing(packed_buf, &mii_rx_clk, PACK);
return sja1105_xfer_buf(priv, SPI_WRITE, regs->mii_rx_clk[port],
packed_buf, SJA1105_SIZE_CGU_CMD);
}
static int
sja1105_cgu_mii_ext_tx_clk_config(struct sja1105_private *priv, int port)
{
const struct sja1105_regs *regs = priv->info->regs;
struct sja1105_cgu_mii_ctrl mii_ext_tx_clk;
u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
const int clk_sources[] = {
CLKSRC_IDIV0,
CLKSRC_IDIV1,
CLKSRC_IDIV2,
CLKSRC_IDIV3,
CLKSRC_IDIV4,
};
/* Payload for packed_buf */
mii_ext_tx_clk.clksrc = clk_sources[port];
mii_ext_tx_clk.autoblock = 1; /* Autoblock clk while changing clksrc */
mii_ext_tx_clk.pd = 0; /* Power Down off => enabled */
sja1105_cgu_mii_control_packing(packed_buf, &mii_ext_tx_clk, PACK);
return sja1105_xfer_buf(priv, SPI_WRITE, regs->mii_ext_tx_clk[port],
packed_buf, SJA1105_SIZE_CGU_CMD);
}
static int
sja1105_cgu_mii_ext_rx_clk_config(struct sja1105_private *priv, int port)
{
const struct sja1105_regs *regs = priv->info->regs;
struct sja1105_cgu_mii_ctrl mii_ext_rx_clk;
u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
const int clk_sources[] = {
CLKSRC_IDIV0,
CLKSRC_IDIV1,
CLKSRC_IDIV2,
CLKSRC_IDIV3,
CLKSRC_IDIV4,
};
/* Payload for packed_buf */
mii_ext_rx_clk.clksrc = clk_sources[port];
mii_ext_rx_clk.autoblock = 1; /* Autoblock clk while changing clksrc */
mii_ext_rx_clk.pd = 0; /* Power Down off => enabled */
sja1105_cgu_mii_control_packing(packed_buf, &mii_ext_rx_clk, PACK);
return sja1105_xfer_buf(priv, SPI_WRITE, regs->mii_ext_rx_clk[port],
packed_buf, SJA1105_SIZE_CGU_CMD);
}
static int sja1105_mii_clocking_setup(struct sja1105_private *priv, int port,
sja1105_mii_role_t role)
{
struct device *dev = priv->ds->dev;
int rc;
dev_dbg(dev, "Configuring MII-%s clocking\n",
(role == XMII_MAC) ? "MAC" : "PHY");
/* If role is MAC, disable IDIV
* If role is PHY, enable IDIV and configure for 1/1 divider
*/
rc = sja1105_cgu_idiv_config(priv, port, (role == XMII_PHY), 1);
if (rc < 0)
return rc;
/* Configure CLKSRC of MII_TX_CLK_n
* * If role is MAC, select TX_CLK_n
* * If role is PHY, select IDIV_n
*/
rc = sja1105_cgu_mii_tx_clk_config(priv, port, role);
if (rc < 0)
return rc;
/* Configure CLKSRC of MII_RX_CLK_n
* Select RX_CLK_n
*/
rc = sja1105_cgu_mii_rx_clk_config(priv, port);
if (rc < 0)
return rc;
if (role == XMII_PHY) {
/* Per MII spec, the PHY (which is us) drives the TX_CLK pin */
/* Configure CLKSRC of EXT_TX_CLK_n
* Select IDIV_n
*/
rc = sja1105_cgu_mii_ext_tx_clk_config(priv, port);
if (rc < 0)
return rc;
/* Configure CLKSRC of EXT_RX_CLK_n
* Select IDIV_n
*/
rc = sja1105_cgu_mii_ext_rx_clk_config(priv, port);
if (rc < 0)
return rc;
}
return 0;
}
static void
sja1105_cgu_pll_control_packing(void *buf, struct sja1105_cgu_pll_ctrl *cmd,
enum packing_op op)
{
const int size = 4;
sja1105_packing(buf, &cmd->pllclksrc, 28, 24, size, op);
sja1105_packing(buf, &cmd->msel, 23, 16, size, op);
sja1105_packing(buf, &cmd->autoblock, 11, 11, size, op);
sja1105_packing(buf, &cmd->psel, 9, 8, size, op);
sja1105_packing(buf, &cmd->direct, 7, 7, size, op);
sja1105_packing(buf, &cmd->fbsel, 6, 6, size, op);
sja1105_packing(buf, &cmd->bypass, 1, 1, size, op);
sja1105_packing(buf, &cmd->pd, 0, 0, size, op);
}
static int sja1105_cgu_rgmii_tx_clk_config(struct sja1105_private *priv,
int port, sja1105_speed_t speed)
{
const struct sja1105_regs *regs = priv->info->regs;
struct sja1105_cgu_mii_ctrl txc;
u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
int clksrc;
if (speed == SJA1105_SPEED_1000MBPS) {
clksrc = CLKSRC_PLL0;
} else {
int clk_sources[] = {CLKSRC_IDIV0, CLKSRC_IDIV1, CLKSRC_IDIV2,
CLKSRC_IDIV3, CLKSRC_IDIV4};
clksrc = clk_sources[port];
}
/* RGMII: 125MHz for 1000, 25MHz for 100, 2.5MHz for 10 */
txc.clksrc = clksrc;
/* Autoblock clk while changing clksrc */
txc.autoblock = 1;
/* Power Down off => enabled */
txc.pd = 0;
sja1105_cgu_mii_control_packing(packed_buf, &txc, PACK);
return sja1105_xfer_buf(priv, SPI_WRITE, regs->rgmii_tx_clk[port],
packed_buf, SJA1105_SIZE_CGU_CMD);
}
/* AGU */
static void
sja1105_cfg_pad_mii_packing(void *buf, struct sja1105_cfg_pad_mii *cmd,
enum packing_op op)
{
const int size = 4;
sja1105_packing(buf, &cmd->d32_os, 28, 27, size, op);
sja1105_packing(buf, &cmd->d32_ih, 26, 26, size, op);
sja1105_packing(buf, &cmd->d32_ipud, 25, 24, size, op);
sja1105_packing(buf, &cmd->d10_os, 20, 19, size, op);
sja1105_packing(buf, &cmd->d10_ih, 18, 18, size, op);
sja1105_packing(buf, &cmd->d10_ipud, 17, 16, size, op);
sja1105_packing(buf, &cmd->ctrl_os, 12, 11, size, op);
sja1105_packing(buf, &cmd->ctrl_ih, 10, 10, size, op);
sja1105_packing(buf, &cmd->ctrl_ipud, 9, 8, size, op);
sja1105_packing(buf, &cmd->clk_os, 4, 3, size, op);
sja1105_packing(buf, &cmd->clk_ih, 2, 2, size, op);
sja1105_packing(buf, &cmd->clk_ipud, 1, 0, size, op);
}
static int sja1105_rgmii_cfg_pad_tx_config(struct sja1105_private *priv,
int port)
{
const struct sja1105_regs *regs = priv->info->regs;
struct sja1105_cfg_pad_mii pad_mii_tx = {0};
u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
/* Payload */
pad_mii_tx.d32_os = 3; /* TXD[3:2] output stage: */
/* high noise/high speed */
pad_mii_tx.d10_os = 3; /* TXD[1:0] output stage: */
/* high noise/high speed */
pad_mii_tx.d32_ipud = 2; /* TXD[3:2] input stage: */
/* plain input (default) */
pad_mii_tx.d10_ipud = 2; /* TXD[1:0] input stage: */
/* plain input (default) */
pad_mii_tx.ctrl_os = 3; /* TX_CTL / TX_ER output stage */
pad_mii_tx.ctrl_ipud = 2; /* TX_CTL / TX_ER input stage (default) */
pad_mii_tx.clk_os = 3; /* TX_CLK output stage */
pad_mii_tx.clk_ih = 0; /* TX_CLK input hysteresis (default) */
pad_mii_tx.clk_ipud = 2; /* TX_CLK input stage (default) */
sja1105_cfg_pad_mii_packing(packed_buf, &pad_mii_tx, PACK);
return sja1105_xfer_buf(priv, SPI_WRITE, regs->pad_mii_tx[port],
packed_buf, SJA1105_SIZE_CGU_CMD);
}
static int sja1105_cfg_pad_rx_config(struct sja1105_private *priv, int port)
{
const struct sja1105_regs *regs = priv->info->regs;
struct sja1105_cfg_pad_mii pad_mii_rx = {0};
u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
/* Payload */
pad_mii_rx.d32_ih = 0; /* RXD[3:2] input stage hysteresis: */
/* non-Schmitt (default) */
pad_mii_rx.d32_ipud = 2; /* RXD[3:2] input weak pull-up/down */
/* plain input (default) */
pad_mii_rx.d10_ih = 0; /* RXD[1:0] input stage hysteresis: */
/* non-Schmitt (default) */
pad_mii_rx.d10_ipud = 2; /* RXD[1:0] input weak pull-up/down */
/* plain input (default) */
pad_mii_rx.ctrl_ih = 0; /* RX_DV/CRS_DV/RX_CTL and RX_ER */
/* input stage hysteresis: */
/* non-Schmitt (default) */
pad_mii_rx.ctrl_ipud = 3; /* RX_DV/CRS_DV/RX_CTL and RX_ER */
/* input stage weak pull-up/down: */
/* pull-down */
pad_mii_rx.clk_os = 2; /* RX_CLK/RXC output stage: */
/* medium noise/fast speed (default) */
pad_mii_rx.clk_ih = 0; /* RX_CLK/RXC input hysteresis: */
/* non-Schmitt (default) */
pad_mii_rx.clk_ipud = 2; /* RX_CLK/RXC input pull-up/down: */
/* plain input (default) */
sja1105_cfg_pad_mii_packing(packed_buf, &pad_mii_rx, PACK);
return sja1105_xfer_buf(priv, SPI_WRITE, regs->pad_mii_rx[port],
packed_buf, SJA1105_SIZE_CGU_CMD);
}
static void
sja1105_cfg_pad_mii_id_packing(void *buf, struct sja1105_cfg_pad_mii_id *cmd,
enum packing_op op)
{
const int size = SJA1105_SIZE_CGU_CMD;
sja1105_packing(buf, &cmd->rxc_stable_ovr, 15, 15, size, op);
sja1105_packing(buf, &cmd->rxc_delay, 14, 10, size, op);
sja1105_packing(buf, &cmd->rxc_bypass, 9, 9, size, op);
sja1105_packing(buf, &cmd->rxc_pd, 8, 8, size, op);
sja1105_packing(buf, &cmd->txc_stable_ovr, 7, 7, size, op);
sja1105_packing(buf, &cmd->txc_delay, 6, 2, size, op);
sja1105_packing(buf, &cmd->txc_bypass, 1, 1, size, op);
sja1105_packing(buf, &cmd->txc_pd, 0, 0, size, op);
}
/* Valid range in degrees is an integer between 73.8 and 101.7 */
static u64 sja1105_rgmii_delay(u64 phase)
{
/* UM11040.pdf: The delay in degree phase is 73.8 + delay_tune * 0.9.
* To avoid floating point operations we'll multiply by 10
* and get 1 decimal point precision.
*/
phase *= 10;
return (phase - 738) / 9;
}
/* The RGMII delay setup procedure is 2-step and gets called upon each
* .phylink_mac_config. Both are strategic.
* The reason is that the RX Tunable Delay Line of the SJA1105 MAC has issues
* with recovering from a frequency change of the link partner's RGMII clock.
* The easiest way to recover from this is to temporarily power down the TDL,
* as it will re-lock at the new frequency afterwards.
*/
int sja1105pqrs_setup_rgmii_delay(const void *ctx, int port)
{
const struct sja1105_private *priv = ctx;
const struct sja1105_regs *regs = priv->info->regs;
struct sja1105_cfg_pad_mii_id pad_mii_id = {0};
u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
int rc;
if (priv->rgmii_rx_delay[port])
pad_mii_id.rxc_delay = sja1105_rgmii_delay(90);
if (priv->rgmii_tx_delay[port])
pad_mii_id.txc_delay = sja1105_rgmii_delay(90);
/* Stage 1: Turn the RGMII delay lines off. */
pad_mii_id.rxc_bypass = 1;
pad_mii_id.rxc_pd = 1;
pad_mii_id.txc_bypass = 1;
pad_mii_id.txc_pd = 1;
sja1105_cfg_pad_mii_id_packing(packed_buf, &pad_mii_id, PACK);
rc = sja1105_xfer_buf(priv, SPI_WRITE, regs->pad_mii_id[port],
packed_buf, SJA1105_SIZE_CGU_CMD);
if (rc < 0)
return rc;
/* Stage 2: Turn the RGMII delay lines on. */
if (priv->rgmii_rx_delay[port]) {
pad_mii_id.rxc_bypass = 0;
pad_mii_id.rxc_pd = 0;
}
if (priv->rgmii_tx_delay[port]) {
pad_mii_id.txc_bypass = 0;
pad_mii_id.txc_pd = 0;
}
sja1105_cfg_pad_mii_id_packing(packed_buf, &pad_mii_id, PACK);
return sja1105_xfer_buf(priv, SPI_WRITE, regs->pad_mii_id[port],
packed_buf, SJA1105_SIZE_CGU_CMD);
}
static int sja1105_rgmii_clocking_setup(struct sja1105_private *priv, int port,
sja1105_mii_role_t role)
{
struct device *dev = priv->ds->dev;
struct sja1105_mac_config_entry *mac;
sja1105_speed_t speed;
int rc;
mac = priv->static_config.tables[BLK_IDX_MAC_CONFIG].entries;
speed = mac[port].speed;
dev_dbg(dev, "Configuring port %d RGMII at speed %dMbps\n",
port, speed);
switch (speed) {
case SJA1105_SPEED_1000MBPS:
/* 1000Mbps, IDIV disabled (125 MHz) */
rc = sja1105_cgu_idiv_config(priv, port, false, 1);
break;
case SJA1105_SPEED_100MBPS:
/* 100Mbps, IDIV enabled, divide by 1 (25 MHz) */
rc = sja1105_cgu_idiv_config(priv, port, true, 1);
break;
case SJA1105_SPEED_10MBPS:
/* 10Mbps, IDIV enabled, divide by 10 (2.5 MHz) */
rc = sja1105_cgu_idiv_config(priv, port, true, 10);
break;
case SJA1105_SPEED_AUTO:
/* Skip CGU configuration if there is no speed available
* (e.g. link is not established yet)
*/
dev_dbg(dev, "Speed not available, skipping CGU config\n");
return 0;
default:
rc = -EINVAL;
}
if (rc < 0) {
dev_err(dev, "Failed to configure idiv\n");
return rc;
}
rc = sja1105_cgu_rgmii_tx_clk_config(priv, port, speed);
if (rc < 0) {
dev_err(dev, "Failed to configure RGMII Tx clock\n");
return rc;
}
rc = sja1105_rgmii_cfg_pad_tx_config(priv, port);
if (rc < 0) {
dev_err(dev, "Failed to configure Tx pad registers\n");
return rc;
}
if (!priv->info->setup_rgmii_delay)
return 0;
/* The role has no hardware effect for RGMII. However we use it as
* a proxy for this interface being a MAC-to-MAC connection, with
* the RGMII internal delays needing to be applied by us.
*/
if (role == XMII_MAC)
return 0;
return priv->info->setup_rgmii_delay(priv, port);
}
static int sja1105_cgu_rmii_ref_clk_config(struct sja1105_private *priv,
int port)
{
const struct sja1105_regs *regs = priv->info->regs;
struct sja1105_cgu_mii_ctrl ref_clk;
u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
const int clk_sources[] = {
CLKSRC_MII0_TX_CLK,
CLKSRC_MII1_TX_CLK,
CLKSRC_MII2_TX_CLK,
CLKSRC_MII3_TX_CLK,
CLKSRC_MII4_TX_CLK,
};
/* Payload for packed_buf */
ref_clk.clksrc = clk_sources[port];
ref_clk.autoblock = 1; /* Autoblock clk while changing clksrc */
ref_clk.pd = 0; /* Power Down off => enabled */
sja1105_cgu_mii_control_packing(packed_buf, &ref_clk, PACK);
return sja1105_xfer_buf(priv, SPI_WRITE, regs->rmii_ref_clk[port],
packed_buf, SJA1105_SIZE_CGU_CMD);
}
static int
sja1105_cgu_rmii_ext_tx_clk_config(struct sja1105_private *priv, int port)
{
const struct sja1105_regs *regs = priv->info->regs;
struct sja1105_cgu_mii_ctrl ext_tx_clk;
u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
/* Payload for packed_buf */
ext_tx_clk.clksrc = CLKSRC_PLL1;
ext_tx_clk.autoblock = 1; /* Autoblock clk while changing clksrc */
ext_tx_clk.pd = 0; /* Power Down off => enabled */
sja1105_cgu_mii_control_packing(packed_buf, &ext_tx_clk, PACK);
return sja1105_xfer_buf(priv, SPI_WRITE, regs->rmii_ext_tx_clk[port],
packed_buf, SJA1105_SIZE_CGU_CMD);
}
static int sja1105_cgu_rmii_pll_config(struct sja1105_private *priv)
{
const struct sja1105_regs *regs = priv->info->regs;
u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
struct sja1105_cgu_pll_ctrl pll = {0};
struct device *dev = priv->ds->dev;
int rc;
/* PLL1 must be enabled and output 50 Mhz.
* This is done by writing first 0x0A010941 to
* the PLL_1_C register and then deasserting
* power down (PD) 0x0A010940.
*/
/* Step 1: PLL1 setup for 50Mhz */
pll.pllclksrc = 0xA;
pll.msel = 0x1;
pll.autoblock = 0x1;
pll.psel = 0x1;
pll.direct = 0x0;
pll.fbsel = 0x1;
pll.bypass = 0x0;
pll.pd = 0x1;
sja1105_cgu_pll_control_packing(packed_buf, &pll, PACK);
rc = sja1105_xfer_buf(priv, SPI_WRITE, regs->rmii_pll1, packed_buf,
SJA1105_SIZE_CGU_CMD);
if (rc < 0) {
dev_err(dev, "failed to configure PLL1 for 50MHz\n");
return rc;
}
/* Step 2: Enable PLL1 */
pll.pd = 0x0;
sja1105_cgu_pll_control_packing(packed_buf, &pll, PACK);
rc = sja1105_xfer_buf(priv, SPI_WRITE, regs->rmii_pll1, packed_buf,
SJA1105_SIZE_CGU_CMD);
if (rc < 0) {
dev_err(dev, "failed to enable PLL1\n");
return rc;
}
return rc;
}
static int sja1105_rmii_clocking_setup(struct sja1105_private *priv, int port,
sja1105_mii_role_t role)
{
struct device *dev = priv->ds->dev;
int rc;
dev_dbg(dev, "Configuring RMII-%s clocking\n",
(role == XMII_MAC) ? "MAC" : "PHY");
/* AH1601.pdf chapter 2.5.1. Sources */
if (role == XMII_MAC) {
/* Configure and enable PLL1 for 50Mhz output */
rc = sja1105_cgu_rmii_pll_config(priv);
if (rc < 0)
return rc;
}
/* Disable IDIV for this port */
rc = sja1105_cgu_idiv_config(priv, port, false, 1);
if (rc < 0)
return rc;
/* Source to sink mappings */
rc = sja1105_cgu_rmii_ref_clk_config(priv, port);
if (rc < 0)
return rc;
if (role == XMII_MAC) {
rc = sja1105_cgu_rmii_ext_tx_clk_config(priv, port);
if (rc < 0)
return rc;
}
return 0;
}
int sja1105_clocking_setup_port(struct sja1105_private *priv, int port)
{
struct sja1105_xmii_params_entry *mii;
struct device *dev = priv->ds->dev;
sja1105_phy_interface_t phy_mode;
sja1105_mii_role_t role;
int rc;
mii = priv->static_config.tables[BLK_IDX_XMII_PARAMS].entries;
/* RGMII etc */
phy_mode = mii->xmii_mode[port];
/* MAC or PHY, for applicable types (not RGMII) */
role = mii->phy_mac[port];
switch (phy_mode) {
case XMII_MODE_MII:
rc = sja1105_mii_clocking_setup(priv, port, role);
break;
case XMII_MODE_RMII:
rc = sja1105_rmii_clocking_setup(priv, port, role);
break;
case XMII_MODE_RGMII:
rc = sja1105_rgmii_clocking_setup(priv, port, role);
break;
case XMII_MODE_SGMII:
/* Nothing to do in the CGU for SGMII */
rc = 0;
break;
default:
dev_err(dev, "Invalid interface mode specified: %d\n",
phy_mode);
return -EINVAL;
}
if (rc) {
dev_err(dev, "Clocking setup for port %d failed: %d\n",
port, rc);
return rc;
}
/* Internally pull down the RX_DV/CRS_DV/RX_CTL and RX_ER inputs */
return sja1105_cfg_pad_rx_config(priv, port);
}
int sja1105_clocking_setup(struct sja1105_private *priv)
{
int port, rc;
for (port = 0; port < SJA1105_NUM_PORTS; port++) {
rc = sja1105_clocking_setup_port(priv, port);
if (rc < 0)
return rc;
}
return 0;
}
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