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linux/drivers/net/phy/icplus.c
Dan Carpenter 4e9d9d1f48 net: phy: icplus: call phy_restore_page() when phy_select_page() fails 
The comments to phy_select_page() say that "phy_restore_page() must
always be called after this, irrespective of success or failure of this
call."  If we don't call phy_restore_page() then we are still holding
the phy_lock_mdio_bus() so it eventually leads to a dead lock.

Fixes: 32ab60e539 ("net: phy: icplus: add MDI/MDIX support for IP101A/G")
Fixes: f9bc51e6cc ("net: phy: icplus: fix paged register access")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Michael Walle <michael@walle.cc>
Reviewed-by: Russell King <rmk+kernel@armlinux.org.uk>
Link: https://lore.kernel.org/r/YC+OpFGsDPXPnXM5@mwanda
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-02-22 18:47:48 -08:00

635 lines
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C
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// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for ICPlus PHYs
*
* Copyright (c) 2007 Freescale Semiconductor, Inc.
*/
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/phy.h>
#include <linux/property.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <linux/uaccess.h>
MODULE_DESCRIPTION("ICPlus IP175C/IP101A/IP101G/IC1001 PHY drivers");
MODULE_AUTHOR("Michael Barkowski");
MODULE_LICENSE("GPL");
/* IP101A/G - IP1001 */
#define IP10XX_SPEC_CTRL_STATUS 16 /* Spec. Control Register */
#define IP1001_RXPHASE_SEL BIT(0) /* Add delay on RX_CLK */
#define IP1001_TXPHASE_SEL BIT(1) /* Add delay on TX_CLK */
#define IP1001_SPEC_CTRL_STATUS_2 20 /* IP1001 Spec. Control Reg 2 */
#define IP1001_APS_ON 11 /* IP1001 APS Mode bit */
#define IP101A_G_APS_ON BIT(1) /* IP101A/G APS Mode bit */
#define IP101A_G_AUTO_MDIX_DIS BIT(11)
#define IP101A_G_IRQ_CONF_STATUS 0x11 /* Conf Info IRQ & Status Reg */
#define IP101A_G_IRQ_PIN_USED BIT(15) /* INTR pin used */
#define IP101A_G_IRQ_ALL_MASK BIT(11) /* IRQ's inactive */
#define IP101A_G_IRQ_SPEED_CHANGE BIT(2)
#define IP101A_G_IRQ_DUPLEX_CHANGE BIT(1)
#define IP101A_G_IRQ_LINK_CHANGE BIT(0)
#define IP101A_G_PHY_STATUS 18
#define IP101A_G_MDIX BIT(9)
#define IP101A_G_PHY_SPEC_CTRL 30
#define IP101A_G_FORCE_MDIX BIT(3)
#define IP101G_PAGE_CONTROL 0x14
#define IP101G_PAGE_CONTROL_MASK GENMASK(4, 0)
#define IP101G_DIGITAL_IO_SPEC_CTRL 0x1d
#define IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32 BIT(2)
#define IP101G_DEFAULT_PAGE 16
#define IP101G_P1_CNT_CTRL 17
#define CNT_CTRL_RX_EN BIT(13)
#define IP101G_P8_CNT_CTRL 17
#define CNT_CTRL_RDCLR_EN BIT(15)
#define IP101G_CNT_REG 18
#define IP175C_PHY_ID 0x02430d80
#define IP1001_PHY_ID 0x02430d90
#define IP101A_PHY_ID 0x02430c54
/* The 32-pin IP101GR package can re-configure the mode of the RXER/INTR_32 pin
* (pin number 21). The hardware default is RXER (receive error) mode. But it
* can be configured to interrupt mode manually.
*/
enum ip101gr_sel_intr32 {
IP101GR_SEL_INTR32_KEEP,
IP101GR_SEL_INTR32_INTR,
IP101GR_SEL_INTR32_RXER,
};
struct ip101g_hw_stat {
const char *name;
int page;
};
static struct ip101g_hw_stat ip101g_hw_stats[] = {
{ "phy_crc_errors", 1 },
{ "phy_symbol_errors", 11, },
};
struct ip101a_g_phy_priv {
enum ip101gr_sel_intr32 sel_intr32;
u64 stats[ARRAY_SIZE(ip101g_hw_stats)];
};
static int ip175c_config_init(struct phy_device *phydev)
{
int err, i;
static int full_reset_performed;
if (full_reset_performed == 0) {
/* master reset */
err = mdiobus_write(phydev->mdio.bus, 30, 0, 0x175c);
if (err < 0)
return err;
/* ensure no bus delays overlap reset period */
err = mdiobus_read(phydev->mdio.bus, 30, 0);
/* data sheet specifies reset period is 2 msec */
mdelay(2);
/* enable IP175C mode */
err = mdiobus_write(phydev->mdio.bus, 29, 31, 0x175c);
if (err < 0)
return err;
/* Set MII0 speed and duplex (in PHY mode) */
err = mdiobus_write(phydev->mdio.bus, 29, 22, 0x420);
if (err < 0)
return err;
/* reset switch ports */
for (i = 0; i < 5; i++) {
err = mdiobus_write(phydev->mdio.bus, i,
MII_BMCR, BMCR_RESET);
if (err < 0)
return err;
}
for (i = 0; i < 5; i++)
err = mdiobus_read(phydev->mdio.bus, i, MII_BMCR);
mdelay(2);
full_reset_performed = 1;
}
if (phydev->mdio.addr != 4) {
phydev->state = PHY_RUNNING;
phydev->speed = SPEED_100;
phydev->duplex = DUPLEX_FULL;
phydev->link = 1;
netif_carrier_on(phydev->attached_dev);
}
return 0;
}
static int ip1001_config_init(struct phy_device *phydev)
{
int c;
/* Enable Auto Power Saving mode */
c = phy_read(phydev, IP1001_SPEC_CTRL_STATUS_2);
if (c < 0)
return c;
c |= IP1001_APS_ON;
c = phy_write(phydev, IP1001_SPEC_CTRL_STATUS_2, c);
if (c < 0)
return c;
if (phy_interface_is_rgmii(phydev)) {
c = phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
if (c < 0)
return c;
c &= ~(IP1001_RXPHASE_SEL | IP1001_TXPHASE_SEL);
if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
c |= (IP1001_RXPHASE_SEL | IP1001_TXPHASE_SEL);
else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
c |= IP1001_RXPHASE_SEL;
else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
c |= IP1001_TXPHASE_SEL;
c = phy_write(phydev, IP10XX_SPEC_CTRL_STATUS, c);
if (c < 0)
return c;
}
return 0;
}
static int ip175c_read_status(struct phy_device *phydev)
{
if (phydev->mdio.addr == 4) /* WAN port */
genphy_read_status(phydev);
else
/* Don't need to read status for switch ports */
phydev->irq = PHY_MAC_INTERRUPT;
return 0;
}
static int ip175c_config_aneg(struct phy_device *phydev)
{
if (phydev->mdio.addr == 4) /* WAN port */
genphy_config_aneg(phydev);
return 0;
}
static int ip101a_g_probe(struct phy_device *phydev)
{
struct device *dev = &phydev->mdio.dev;
struct ip101a_g_phy_priv *priv;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
/* Both functions (RX error and interrupt status) are sharing the same
* pin on the 32-pin IP101GR, so this is an exclusive choice.
*/
if (device_property_read_bool(dev, "icplus,select-rx-error") &&
device_property_read_bool(dev, "icplus,select-interrupt")) {
dev_err(dev,
"RXER and INTR mode cannot be selected together\n");
return -EINVAL;
}
if (device_property_read_bool(dev, "icplus,select-rx-error"))
priv->sel_intr32 = IP101GR_SEL_INTR32_RXER;
else if (device_property_read_bool(dev, "icplus,select-interrupt"))
priv->sel_intr32 = IP101GR_SEL_INTR32_INTR;
else
priv->sel_intr32 = IP101GR_SEL_INTR32_KEEP;
phydev->priv = priv;
return 0;
}
static int ip101a_g_config_intr_pin(struct phy_device *phydev)
{
struct ip101a_g_phy_priv *priv = phydev->priv;
int oldpage, err = 0;
oldpage = phy_select_page(phydev, IP101G_DEFAULT_PAGE);
if (oldpage < 0)
goto out;
/* configure the RXER/INTR_32 pin of the 32-pin IP101GR if needed: */
switch (priv->sel_intr32) {
case IP101GR_SEL_INTR32_RXER:
err = __phy_modify(phydev, IP101G_DIGITAL_IO_SPEC_CTRL,
IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32, 0);
if (err < 0)
goto out;
break;
case IP101GR_SEL_INTR32_INTR:
err = __phy_modify(phydev, IP101G_DIGITAL_IO_SPEC_CTRL,
IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32,
IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32);
if (err < 0)
goto out;
break;
default:
/* Don't touch IP101G_DIGITAL_IO_SPEC_CTRL because it's not
* documented on IP101A and it's not clear whether this would
* cause problems.
* For the 32-pin IP101GR we simply keep the SEL_INTR32
* configuration as set by the bootloader when not configured
* to one of the special functions.
*/
break;
}
out:
return phy_restore_page(phydev, oldpage, err);
}
static int ip101a_config_init(struct phy_device *phydev)
{
int ret;
/* Enable Auto Power Saving mode */
ret = phy_set_bits(phydev, IP10XX_SPEC_CTRL_STATUS, IP101A_G_APS_ON);
if (ret)
return ret;
return ip101a_g_config_intr_pin(phydev);
}
static int ip101g_config_init(struct phy_device *phydev)
{
int ret;
/* Enable the PHY counters */
ret = phy_modify_paged(phydev, 1, IP101G_P1_CNT_CTRL,
CNT_CTRL_RX_EN, CNT_CTRL_RX_EN);
if (ret)
return ret;
/* Clear error counters on read */
ret = phy_modify_paged(phydev, 8, IP101G_P8_CNT_CTRL,
CNT_CTRL_RDCLR_EN, CNT_CTRL_RDCLR_EN);
if (ret)
return ret;
return ip101a_g_config_intr_pin(phydev);
}
static int ip101a_g_read_status(struct phy_device *phydev)
{
int oldpage, ret, stat1, stat2;
ret = genphy_read_status(phydev);
if (ret)
return ret;
oldpage = phy_select_page(phydev, IP101G_DEFAULT_PAGE);
if (oldpage < 0)
goto out;
ret = __phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
if (ret < 0)
goto out;
stat1 = ret;
ret = __phy_read(phydev, IP101A_G_PHY_SPEC_CTRL);
if (ret < 0)
goto out;
stat2 = ret;
if (stat1 & IP101A_G_AUTO_MDIX_DIS) {
if (stat2 & IP101A_G_FORCE_MDIX)
phydev->mdix_ctrl = ETH_TP_MDI_X;
else
phydev->mdix_ctrl = ETH_TP_MDI;
} else {
phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
}
if (stat2 & IP101A_G_MDIX)
phydev->mdix = ETH_TP_MDI_X;
else
phydev->mdix = ETH_TP_MDI;
ret = 0;
out:
return phy_restore_page(phydev, oldpage, ret);
}
static int ip101a_g_config_mdix(struct phy_device *phydev)
{
u16 ctrl = 0, ctrl2 = 0;
int oldpage;
int ret = 0;
switch (phydev->mdix_ctrl) {
case ETH_TP_MDI:
ctrl = IP101A_G_AUTO_MDIX_DIS;
break;
case ETH_TP_MDI_X:
ctrl = IP101A_G_AUTO_MDIX_DIS;
ctrl2 = IP101A_G_FORCE_MDIX;
break;
case ETH_TP_MDI_AUTO:
break;
default:
return 0;
}
oldpage = phy_select_page(phydev, IP101G_DEFAULT_PAGE);
if (oldpage < 0)
goto out;
ret = __phy_modify(phydev, IP10XX_SPEC_CTRL_STATUS,
IP101A_G_AUTO_MDIX_DIS, ctrl);
if (ret)
goto out;
ret = __phy_modify(phydev, IP101A_G_PHY_SPEC_CTRL,
IP101A_G_FORCE_MDIX, ctrl2);
out:
return phy_restore_page(phydev, oldpage, ret);
}
static int ip101a_g_config_aneg(struct phy_device *phydev)
{
int ret;
ret = ip101a_g_config_mdix(phydev);
if (ret)
return ret;
return genphy_config_aneg(phydev);
}
static int ip101a_g_ack_interrupt(struct phy_device *phydev)
{
int err;
err = phy_read_paged(phydev, IP101G_DEFAULT_PAGE,
IP101A_G_IRQ_CONF_STATUS);
if (err < 0)
return err;
return 0;
}
static int ip101a_g_config_intr(struct phy_device *phydev)
{
u16 val;
int err;
if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
err = ip101a_g_ack_interrupt(phydev);
if (err)
return err;
/* INTR pin used: Speed/link/duplex will cause an interrupt */
val = IP101A_G_IRQ_PIN_USED;
err = phy_write_paged(phydev, IP101G_DEFAULT_PAGE,
IP101A_G_IRQ_CONF_STATUS, val);
} else {
val = IP101A_G_IRQ_ALL_MASK;
err = phy_write_paged(phydev, IP101G_DEFAULT_PAGE,
IP101A_G_IRQ_CONF_STATUS, val);
if (err)
return err;
err = ip101a_g_ack_interrupt(phydev);
}
return err;
}
static irqreturn_t ip101a_g_handle_interrupt(struct phy_device *phydev)
{
int irq_status;
irq_status = phy_read_paged(phydev, IP101G_DEFAULT_PAGE,
IP101A_G_IRQ_CONF_STATUS);
if (irq_status < 0) {
phy_error(phydev);
return IRQ_NONE;
}
if (!(irq_status & (IP101A_G_IRQ_SPEED_CHANGE |
IP101A_G_IRQ_DUPLEX_CHANGE |
IP101A_G_IRQ_LINK_CHANGE)))
return IRQ_NONE;
phy_trigger_machine(phydev);
return IRQ_HANDLED;
}
/* The IP101A doesn't really have a page register. We just pretend to have one
* so we can use the paged versions of the callbacks of the IP101G.
*/
static int ip101a_read_page(struct phy_device *phydev)
{
return IP101G_DEFAULT_PAGE;
}
static int ip101a_write_page(struct phy_device *phydev, int page)
{
WARN_ONCE(page != IP101G_DEFAULT_PAGE, "wrong page selected\n");
return 0;
}
static int ip101g_read_page(struct phy_device *phydev)
{
return __phy_read(phydev, IP101G_PAGE_CONTROL);
}
static int ip101g_write_page(struct phy_device *phydev, int page)
{
return __phy_write(phydev, IP101G_PAGE_CONTROL, page);
}
static int ip101a_g_has_page_register(struct phy_device *phydev)
{
int oldval, val, ret;
oldval = phy_read(phydev, IP101G_PAGE_CONTROL);
if (oldval < 0)
return oldval;
ret = phy_write(phydev, IP101G_PAGE_CONTROL, 0xffff);
if (ret)
return ret;
val = phy_read(phydev, IP101G_PAGE_CONTROL);
if (val < 0)
return val;
ret = phy_write(phydev, IP101G_PAGE_CONTROL, oldval);
if (ret)
return ret;
return val == IP101G_PAGE_CONTROL_MASK;
}
static int ip101a_g_match_phy_device(struct phy_device *phydev, bool ip101a)
{
int ret;
if (phydev->phy_id != IP101A_PHY_ID)
return 0;
/* The IP101A and the IP101G share the same PHY identifier.The IP101G
* seems to be a successor of the IP101A and implements more functions.
* Amongst other things there is a page select register, which is not
* available on the IP101A. Use this to distinguish these two.
*/
ret = ip101a_g_has_page_register(phydev);
if (ret < 0)
return ret;
return ip101a == !ret;
}
static int ip101a_match_phy_device(struct phy_device *phydev)
{
return ip101a_g_match_phy_device(phydev, true);
}
static int ip101g_match_phy_device(struct phy_device *phydev)
{
return ip101a_g_match_phy_device(phydev, false);
}
static int ip101g_get_sset_count(struct phy_device *phydev)
{
return ARRAY_SIZE(ip101g_hw_stats);
}
static void ip101g_get_strings(struct phy_device *phydev, u8 *data)
{
int i;
for (i = 0; i < ARRAY_SIZE(ip101g_hw_stats); i++)
strscpy(data + i * ETH_GSTRING_LEN,
ip101g_hw_stats[i].name, ETH_GSTRING_LEN);
}
static u64 ip101g_get_stat(struct phy_device *phydev, int i)
{
struct ip101g_hw_stat stat = ip101g_hw_stats[i];
struct ip101a_g_phy_priv *priv = phydev->priv;
int val;
u64 ret;
val = phy_read_paged(phydev, stat.page, IP101G_CNT_REG);
if (val < 0) {
ret = U64_MAX;
} else {
priv->stats[i] += val;
ret = priv->stats[i];
}
return ret;
}
static void ip101g_get_stats(struct phy_device *phydev,
struct ethtool_stats *stats, u64 *data)
{
int i;
for (i = 0; i < ARRAY_SIZE(ip101g_hw_stats); i++)
data[i] = ip101g_get_stat(phydev, i);
}
static struct phy_driver icplus_driver[] = {
{
PHY_ID_MATCH_MODEL(IP175C_PHY_ID),
.name = "ICPlus IP175C",
/* PHY_BASIC_FEATURES */
.config_init = ip175c_config_init,
.config_aneg = ip175c_config_aneg,
.read_status = ip175c_read_status,
.suspend = genphy_suspend,
.resume = genphy_resume,
}, {
PHY_ID_MATCH_MODEL(IP1001_PHY_ID),
.name = "ICPlus IP1001",
/* PHY_GBIT_FEATURES */
.config_init = ip1001_config_init,
.soft_reset = genphy_soft_reset,
.suspend = genphy_suspend,
.resume = genphy_resume,
}, {
.name = "ICPlus IP101A",
.match_phy_device = ip101a_match_phy_device,
.probe = ip101a_g_probe,
.read_page = ip101a_read_page,
.write_page = ip101a_write_page,
.config_intr = ip101a_g_config_intr,
.handle_interrupt = ip101a_g_handle_interrupt,
.config_init = ip101a_config_init,
.config_aneg = ip101a_g_config_aneg,
.read_status = ip101a_g_read_status,
.soft_reset = genphy_soft_reset,
.suspend = genphy_suspend,
.resume = genphy_resume,
}, {
.name = "ICPlus IP101G",
.match_phy_device = ip101g_match_phy_device,
.probe = ip101a_g_probe,
.read_page = ip101g_read_page,
.write_page = ip101g_write_page,
.config_intr = ip101a_g_config_intr,
.handle_interrupt = ip101a_g_handle_interrupt,
.config_init = ip101g_config_init,
.config_aneg = ip101a_g_config_aneg,
.read_status = ip101a_g_read_status,
.soft_reset = genphy_soft_reset,
.get_sset_count = ip101g_get_sset_count,
.get_strings = ip101g_get_strings,
.get_stats = ip101g_get_stats,
.suspend = genphy_suspend,
.resume = genphy_resume,
} };
module_phy_driver(icplus_driver);
static struct mdio_device_id __maybe_unused icplus_tbl[] = {
{ PHY_ID_MATCH_MODEL(IP175C_PHY_ID) },
{ PHY_ID_MATCH_MODEL(IP1001_PHY_ID) },
{ PHY_ID_MATCH_EXACT(IP101A_PHY_ID) },
{ }
};
MODULE_DEVICE_TABLE(mdio, icplus_tbl);
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