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linux/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
Stephen Boyd ead87637a9 stmmac: ipq806x: Return error values instead of pointers 
Typically we return error pointers when we want to use those
pointers in the non-error case, but this function is just
returning error pointers or NULL for success. Change the style to
plain int to follow normal kernel coding styles.

Cc: Joachim Eastwood <manabian@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-12-03 15:24:42 -05:00

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/*
* Qualcomm Atheros IPQ806x GMAC glue layer
*
* Copyright (C) 2015 The Linux Foundation
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/phy.h>
#include <linux/regmap.h>
#include <linux/clk.h>
#include <linux/reset.h>
#include <linux/of_net.h>
#include <linux/mfd/syscon.h>
#include <linux/stmmac.h>
#include <linux/of_mdio.h>
#include <linux/module.h>
#include "stmmac_platform.h"
#define NSS_COMMON_CLK_GATE 0x8
#define NSS_COMMON_CLK_GATE_PTP_EN(x) BIT(0x10 + x)
#define NSS_COMMON_CLK_GATE_RGMII_RX_EN(x) BIT(0x9 + (x * 2))
#define NSS_COMMON_CLK_GATE_RGMII_TX_EN(x) BIT(0x8 + (x * 2))
#define NSS_COMMON_CLK_GATE_GMII_RX_EN(x) BIT(0x4 + x)
#define NSS_COMMON_CLK_GATE_GMII_TX_EN(x) BIT(0x0 + x)
#define NSS_COMMON_CLK_DIV0 0xC
#define NSS_COMMON_CLK_DIV_OFFSET(x) (x * 8)
#define NSS_COMMON_CLK_DIV_MASK 0x7f
#define NSS_COMMON_CLK_SRC_CTRL 0x14
#define NSS_COMMON_CLK_SRC_CTRL_OFFSET(x) (x)
/* Mode is coded on 1 bit but is different depending on the MAC ID:
* MAC0: QSGMII=0 RGMII=1
* MAC1: QSGMII=0 SGMII=0 RGMII=1
* MAC2 & MAC3: QSGMII=0 SGMII=1
*/
#define NSS_COMMON_CLK_SRC_CTRL_RGMII(x) 1
#define NSS_COMMON_CLK_SRC_CTRL_SGMII(x) ((x >= 2) ? 1 : 0)
#define NSS_COMMON_MACSEC_CTL 0x28
#define NSS_COMMON_MACSEC_CTL_EXT_BYPASS_EN(x) (1 << x)
#define NSS_COMMON_GMAC_CTL(x) (0x30 + (x * 4))
#define NSS_COMMON_GMAC_CTL_CSYS_REQ BIT(19)
#define NSS_COMMON_GMAC_CTL_PHY_IFACE_SEL BIT(16)
#define NSS_COMMON_GMAC_CTL_IFG_LIMIT_OFFSET 8
#define NSS_COMMON_GMAC_CTL_IFG_OFFSET 0
#define NSS_COMMON_GMAC_CTL_IFG_MASK 0x3f
#define NSS_COMMON_CLK_DIV_RGMII_1000 1
#define NSS_COMMON_CLK_DIV_RGMII_100 9
#define NSS_COMMON_CLK_DIV_RGMII_10 99
#define NSS_COMMON_CLK_DIV_SGMII_1000 0
#define NSS_COMMON_CLK_DIV_SGMII_100 4
#define NSS_COMMON_CLK_DIV_SGMII_10 49
#define QSGMII_PCS_MODE_CTL 0x68
#define QSGMII_PCS_MODE_CTL_AUTONEG_EN(x) BIT((x * 8) + 7)
#define QSGMII_PCS_CAL_LCKDT_CTL 0x120
#define QSGMII_PCS_CAL_LCKDT_CTL_RST BIT(19)
/* Only GMAC1/2/3 support SGMII and their CTL register are not contiguous */
#define QSGMII_PHY_SGMII_CTL(x) ((x == 1) ? 0x134 : \
(0x13c + (4 * (x - 2))))
#define QSGMII_PHY_CDR_EN BIT(0)
#define QSGMII_PHY_RX_FRONT_EN BIT(1)
#define QSGMII_PHY_RX_SIGNAL_DETECT_EN BIT(2)
#define QSGMII_PHY_TX_DRIVER_EN BIT(3)
#define QSGMII_PHY_QSGMII_EN BIT(7)
#define QSGMII_PHY_PHASE_LOOP_GAIN_OFFSET 12
#define QSGMII_PHY_PHASE_LOOP_GAIN_MASK 0x7
#define QSGMII_PHY_RX_DC_BIAS_OFFSET 18
#define QSGMII_PHY_RX_DC_BIAS_MASK 0x3
#define QSGMII_PHY_RX_INPUT_EQU_OFFSET 20
#define QSGMII_PHY_RX_INPUT_EQU_MASK 0x3
#define QSGMII_PHY_CDR_PI_SLEW_OFFSET 22
#define QSGMII_PHY_CDR_PI_SLEW_MASK 0x3
#define QSGMII_PHY_TX_DRV_AMP_OFFSET 28
#define QSGMII_PHY_TX_DRV_AMP_MASK 0xf
struct ipq806x_gmac {
struct platform_device *pdev;
struct regmap *nss_common;
struct regmap *qsgmii_csr;
uint32_t id;
struct clk *core_clk;
phy_interface_t phy_mode;
};
static int get_clk_div_sgmii(struct ipq806x_gmac *gmac, unsigned int speed)
{
struct device *dev = &gmac->pdev->dev;
int div;
switch (speed) {
case SPEED_1000:
div = NSS_COMMON_CLK_DIV_SGMII_1000;
break;
case SPEED_100:
div = NSS_COMMON_CLK_DIV_SGMII_100;
break;
case SPEED_10:
div = NSS_COMMON_CLK_DIV_SGMII_10;
break;
default:
dev_err(dev, "Speed %dMbps not supported in SGMII\n", speed);
return -EINVAL;
}
return div;
}
static int get_clk_div_rgmii(struct ipq806x_gmac *gmac, unsigned int speed)
{
struct device *dev = &gmac->pdev->dev;
int div;
switch (speed) {
case SPEED_1000:
div = NSS_COMMON_CLK_DIV_RGMII_1000;
break;
case SPEED_100:
div = NSS_COMMON_CLK_DIV_RGMII_100;
break;
case SPEED_10:
div = NSS_COMMON_CLK_DIV_RGMII_10;
break;
default:
dev_err(dev, "Speed %dMbps not supported in RGMII\n", speed);
return -EINVAL;
}
return div;
}
static int ipq806x_gmac_set_speed(struct ipq806x_gmac *gmac, unsigned int speed)
{
uint32_t clk_bits, val;
int div;
switch (gmac->phy_mode) {
case PHY_INTERFACE_MODE_RGMII:
div = get_clk_div_rgmii(gmac, speed);
clk_bits = NSS_COMMON_CLK_GATE_RGMII_RX_EN(gmac->id) |
NSS_COMMON_CLK_GATE_RGMII_TX_EN(gmac->id);
break;
case PHY_INTERFACE_MODE_SGMII:
div = get_clk_div_sgmii(gmac, speed);
clk_bits = NSS_COMMON_CLK_GATE_GMII_RX_EN(gmac->id) |
NSS_COMMON_CLK_GATE_GMII_TX_EN(gmac->id);
break;
default:
dev_err(&gmac->pdev->dev, "Unsupported PHY mode: \"%s\"\n",
phy_modes(gmac->phy_mode));
return -EINVAL;
}
/* Disable the clocks */
regmap_read(gmac->nss_common, NSS_COMMON_CLK_GATE, &val);
val &= ~clk_bits;
regmap_write(gmac->nss_common, NSS_COMMON_CLK_GATE, val);
/* Set the divider */
regmap_read(gmac->nss_common, NSS_COMMON_CLK_DIV0, &val);
val &= ~(NSS_COMMON_CLK_DIV_MASK
<< NSS_COMMON_CLK_DIV_OFFSET(gmac->id));
val |= div << NSS_COMMON_CLK_DIV_OFFSET(gmac->id);
regmap_write(gmac->nss_common, NSS_COMMON_CLK_DIV0, val);
/* Enable the clock back */
regmap_read(gmac->nss_common, NSS_COMMON_CLK_GATE, &val);
val |= clk_bits;
regmap_write(gmac->nss_common, NSS_COMMON_CLK_GATE, val);
return 0;
}
static int ipq806x_gmac_of_parse(struct ipq806x_gmac *gmac)
{
struct device *dev = &gmac->pdev->dev;
gmac->phy_mode = of_get_phy_mode(dev->of_node);
if (gmac->phy_mode < 0) {
dev_err(dev, "missing phy mode property\n");
return -EINVAL;
}
if (of_property_read_u32(dev->of_node, "qcom,id", &gmac->id) < 0) {
dev_err(dev, "missing qcom id property\n");
return -EINVAL;
}
/* The GMACs are called 1 to 4 in the documentation, but to simplify the
* code and keep it consistent with the Linux convention, we'll number
* them from 0 to 3 here.
*/
if (gmac->id < 0 || gmac->id > 3) {
dev_err(dev, "invalid gmac id\n");
return -EINVAL;
}
gmac->core_clk = devm_clk_get(dev, "stmmaceth");
if (IS_ERR(gmac->core_clk)) {
dev_err(dev, "missing stmmaceth clk property\n");
return PTR_ERR(gmac->core_clk);
}
clk_set_rate(gmac->core_clk, 266000000);
/* Setup the register map for the nss common registers */
gmac->nss_common = syscon_regmap_lookup_by_phandle(dev->of_node,
"qcom,nss-common");
if (IS_ERR(gmac->nss_common)) {
dev_err(dev, "missing nss-common node\n");
return PTR_ERR(gmac->nss_common);
}
/* Setup the register map for the qsgmii csr registers */
gmac->qsgmii_csr = syscon_regmap_lookup_by_phandle(dev->of_node,
"qcom,qsgmii-csr");
if (IS_ERR(gmac->qsgmii_csr))
dev_err(dev, "missing qsgmii-csr node\n");
return PTR_ERR_OR_ZERO(gmac->qsgmii_csr);
}
static void ipq806x_gmac_fix_mac_speed(void *priv, unsigned int speed)
{
struct ipq806x_gmac *gmac = priv;
ipq806x_gmac_set_speed(gmac, speed);
}
static int ipq806x_gmac_probe(struct platform_device *pdev)
{
struct plat_stmmacenet_data *plat_dat;
struct stmmac_resources stmmac_res;
struct device *dev = &pdev->dev;
struct ipq806x_gmac *gmac;
int val;
int err;
val = stmmac_get_platform_resources(pdev, &stmmac_res);
if (val)
return val;
plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
if (IS_ERR(plat_dat))
return PTR_ERR(plat_dat);
gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL);
if (!gmac)
return -ENOMEM;
gmac->pdev = pdev;
err = ipq806x_gmac_of_parse(gmac);
if (err) {
dev_err(dev, "device tree parsing error\n");
return err;
}
regmap_write(gmac->qsgmii_csr, QSGMII_PCS_CAL_LCKDT_CTL,
QSGMII_PCS_CAL_LCKDT_CTL_RST);
/* Inter frame gap is set to 12 */
val = 12 << NSS_COMMON_GMAC_CTL_IFG_OFFSET |
12 << NSS_COMMON_GMAC_CTL_IFG_LIMIT_OFFSET;
/* We also initiate an AXI low power exit request */
val |= NSS_COMMON_GMAC_CTL_CSYS_REQ;
switch (gmac->phy_mode) {
case PHY_INTERFACE_MODE_RGMII:
val |= NSS_COMMON_GMAC_CTL_PHY_IFACE_SEL;
break;
case PHY_INTERFACE_MODE_SGMII:
val &= ~NSS_COMMON_GMAC_CTL_PHY_IFACE_SEL;
break;
default:
dev_err(&pdev->dev, "Unsupported PHY mode: \"%s\"\n",
phy_modes(gmac->phy_mode));
return -EINVAL;
}
regmap_write(gmac->nss_common, NSS_COMMON_GMAC_CTL(gmac->id), val);
/* Configure the clock src according to the mode */
regmap_read(gmac->nss_common, NSS_COMMON_CLK_SRC_CTRL, &val);
val &= ~(1 << NSS_COMMON_CLK_SRC_CTRL_OFFSET(gmac->id));
switch (gmac->phy_mode) {
case PHY_INTERFACE_MODE_RGMII:
val |= NSS_COMMON_CLK_SRC_CTRL_RGMII(gmac->id) <<
NSS_COMMON_CLK_SRC_CTRL_OFFSET(gmac->id);
break;
case PHY_INTERFACE_MODE_SGMII:
val |= NSS_COMMON_CLK_SRC_CTRL_SGMII(gmac->id) <<
NSS_COMMON_CLK_SRC_CTRL_OFFSET(gmac->id);
break;
default:
dev_err(&pdev->dev, "Unsupported PHY mode: \"%s\"\n",
phy_modes(gmac->phy_mode));
return -EINVAL;
}
regmap_write(gmac->nss_common, NSS_COMMON_CLK_SRC_CTRL, val);
/* Enable PTP clock */
regmap_read(gmac->nss_common, NSS_COMMON_CLK_GATE, &val);
val |= NSS_COMMON_CLK_GATE_PTP_EN(gmac->id);
regmap_write(gmac->nss_common, NSS_COMMON_CLK_GATE, val);
if (gmac->phy_mode == PHY_INTERFACE_MODE_SGMII) {
regmap_write(gmac->qsgmii_csr, QSGMII_PHY_SGMII_CTL(gmac->id),
QSGMII_PHY_CDR_EN |
QSGMII_PHY_RX_FRONT_EN |
QSGMII_PHY_RX_SIGNAL_DETECT_EN |
QSGMII_PHY_TX_DRIVER_EN |
QSGMII_PHY_QSGMII_EN |
0x4ul << QSGMII_PHY_PHASE_LOOP_GAIN_OFFSET |
0x3ul << QSGMII_PHY_RX_DC_BIAS_OFFSET |
0x1ul << QSGMII_PHY_RX_INPUT_EQU_OFFSET |
0x2ul << QSGMII_PHY_CDR_PI_SLEW_OFFSET |
0xCul << QSGMII_PHY_TX_DRV_AMP_OFFSET);
}
plat_dat->has_gmac = true;
plat_dat->bsp_priv = gmac;
plat_dat->fix_mac_speed = ipq806x_gmac_fix_mac_speed;
return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
}
static const struct of_device_id ipq806x_gmac_dwmac_match[] = {
{ .compatible = "qcom,ipq806x-gmac" },
{ }
};
MODULE_DEVICE_TABLE(of, ipq806x_gmac_dwmac_match);
static struct platform_driver ipq806x_gmac_dwmac_driver = {
.probe = ipq806x_gmac_probe,
.remove = stmmac_pltfr_remove,
.driver = {
.name = "ipq806x-gmac-dwmac",
.pm = &stmmac_pltfr_pm_ops,
.of_match_table = ipq806x_gmac_dwmac_match,
},
};
module_platform_driver(ipq806x_gmac_dwmac_driver);
MODULE_AUTHOR("Mathieu Olivari <mathieu@codeaurora.org>");
MODULE_DESCRIPTION("Qualcomm Atheros IPQ806x DWMAC specific glue layer");
MODULE_LICENSE("Dual BSD/GPL");
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