blob: 8e07d4a1b6ba45db1b233b8acbe8da6d2eb186db [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/*
* DaVinci MDIO Module driver
*
* Copyright (C) 2010 Texas Instruments.
*
* Shamelessly ripped out of davinci_emac.c, original copyrights follow:
*
* Copyright (C) 2009 Texas Instruments.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/phy.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/pm_runtime.h>
#include <linux/davinci_emac.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/pinctrl/consumer.h>
#include <linux/mdio-bitbang.h>
#include <linux/sys_soc.h>
/*
* This timeout definition is a worst-case ultra defensive measure against
* unexpected controller lock ups. Ideally, we should never ever hit this
* scenario in practice.
*/
#define MDIO_TIMEOUT 100 /* msecs */
#define PHY_REG_MASK 0x1f
#define PHY_ID_MASK 0x1f
#define DEF_OUT_FREQ 2200000 /* 2.2 MHz */
struct davinci_mdio_of_param {
int autosuspend_delay_ms;
bool manual_mode;
};
struct davinci_mdio_regs {
u32 version;
u32 control;
#define CONTROL_IDLE BIT(31)
#define CONTROL_ENABLE BIT(30)
#define CONTROL_MAX_DIV (0xffff)
#define CONTROL_CLKDIV GENMASK(15, 0)
#define MDIO_MAN_MDCLK_O BIT(2)
#define MDIO_MAN_OE BIT(1)
#define MDIO_MAN_PIN BIT(0)
#define MDIO_MANUALMODE BIT(31)
#define MDIO_PIN 0
u32 alive;
u32 link;
u32 linkintraw;
u32 linkintmasked;
u32 __reserved_0[2];
u32 userintraw;
u32 userintmasked;
u32 userintmaskset;
u32 userintmaskclr;
u32 manualif;
u32 poll;
u32 __reserved_1[18];
struct {
u32 access;
#define USERACCESS_GO BIT(31)
#define USERACCESS_WRITE BIT(30)
#define USERACCESS_ACK BIT(29)
#define USERACCESS_READ (0)
#define USERACCESS_DATA (0xffff)
u32 physel;
} user[];
};
static const struct mdio_platform_data default_pdata = {
.bus_freq = DEF_OUT_FREQ,
};
struct davinci_mdio_data {
struct mdio_platform_data pdata;
struct mdiobb_ctrl bb_ctrl;
struct davinci_mdio_regs __iomem *regs;
struct clk *clk;
struct device *dev;
struct mii_bus *bus;
bool active_in_suspend;
unsigned long access_time; /* jiffies */
/* Indicates that driver shouldn't modify phy_mask in case
* if MDIO bus is registered from DT.
*/
bool skip_scan;
u32 clk_div;
bool manual_mode;
};
static void davinci_mdio_init_clk(struct davinci_mdio_data *data)
{
u32 mdio_in, div, mdio_out_khz, access_time;
mdio_in = clk_get_rate(data->clk);
div = (mdio_in / data->pdata.bus_freq) - 1;
if (div > CONTROL_MAX_DIV)
div = CONTROL_MAX_DIV;
data->clk_div = div;
/*
* One mdio transaction consists of:
* 32 bits of preamble
* 32 bits of transferred data
* 24 bits of bus yield (not needed unless shared?)
*/
mdio_out_khz = mdio_in / (1000 * (div + 1));
access_time = (88 * 1000) / mdio_out_khz;
/*
* In the worst case, we could be kicking off a user-access immediately
* after the mdio bus scan state-machine triggered its own read. If
* so, our request could get deferred by one access cycle. We
* defensively allow for 4 access cycles.
*/
data->access_time = usecs_to_jiffies(access_time * 4);
if (!data->access_time)
data->access_time = 1;
}
static void davinci_mdio_enable(struct davinci_mdio_data *data)
{
/* set enable and clock divider */
writel(data->clk_div | CONTROL_ENABLE, &data->regs->control);
}
static void davinci_mdio_disable(struct davinci_mdio_data *data)
{
u32 reg;
/* Disable MDIO state machine */
reg = readl(&data->regs->control);
reg &= ~CONTROL_CLKDIV;
reg |= data->clk_div;
reg &= ~CONTROL_ENABLE;
writel(reg, &data->regs->control);
}
static void davinci_mdio_enable_manual_mode(struct davinci_mdio_data *data)
{
u32 reg;
/* set manual mode */
reg = readl(&data->regs->poll);
reg |= MDIO_MANUALMODE;
writel(reg, &data->regs->poll);
}
static void davinci_set_mdc(struct mdiobb_ctrl *ctrl, int level)
{
struct davinci_mdio_data *data;
u32 reg;
data = container_of(ctrl, struct davinci_mdio_data, bb_ctrl);
reg = readl(&data->regs->manualif);
if (level)
reg |= MDIO_MAN_MDCLK_O;
else
reg &= ~MDIO_MAN_MDCLK_O;
writel(reg, &data->regs->manualif);
}
static void davinci_set_mdio_dir(struct mdiobb_ctrl *ctrl, int output)
{
struct davinci_mdio_data *data;
u32 reg;
data = container_of(ctrl, struct davinci_mdio_data, bb_ctrl);
reg = readl(&data->regs->manualif);
if (output)
reg |= MDIO_MAN_OE;
else
reg &= ~MDIO_MAN_OE;
writel(reg, &data->regs->manualif);
}
static void davinci_set_mdio_data(struct mdiobb_ctrl *ctrl, int value)
{
struct davinci_mdio_data *data;
u32 reg;
data = container_of(ctrl, struct davinci_mdio_data, bb_ctrl);
reg = readl(&data->regs->manualif);
if (value)
reg |= MDIO_MAN_PIN;
else
reg &= ~MDIO_MAN_PIN;
writel(reg, &data->regs->manualif);
}
static int davinci_get_mdio_data(struct mdiobb_ctrl *ctrl)
{
struct davinci_mdio_data *data;
unsigned long reg;
data = container_of(ctrl, struct davinci_mdio_data, bb_ctrl);
reg = readl(&data->regs->manualif);
return test_bit(MDIO_PIN, &reg);
}
static int davinci_mdiobb_read_c22(struct mii_bus *bus, int phy, int reg)
{
int ret;
ret = pm_runtime_resume_and_get(bus->parent);
if (ret < 0)
return ret;
ret = mdiobb_read_c22(bus, phy, reg);
pm_runtime_mark_last_busy(bus->parent);
pm_runtime_put_autosuspend(bus->parent);
return ret;
}
static int davinci_mdiobb_write_c22(struct mii_bus *bus, int phy, int reg,
u16 val)
{
int ret;
ret = pm_runtime_resume_and_get(bus->parent);
if (ret < 0)
return ret;
ret = mdiobb_write_c22(bus, phy, reg, val);
pm_runtime_mark_last_busy(bus->parent);
pm_runtime_put_autosuspend(bus->parent);
return ret;
}
static int davinci_mdiobb_read_c45(struct mii_bus *bus, int phy, int devad,
int reg)
{
int ret;
ret = pm_runtime_resume_and_get(bus->parent);
if (ret < 0)
return ret;
ret = mdiobb_read_c45(bus, phy, devad, reg);
pm_runtime_mark_last_busy(bus->parent);
pm_runtime_put_autosuspend(bus->parent);
return ret;
}
static int davinci_mdiobb_write_c45(struct mii_bus *bus, int phy, int devad,
int reg, u16 val)
{
int ret;
ret = pm_runtime_resume_and_get(bus->parent);
if (ret < 0)
return ret;
ret = mdiobb_write_c45(bus, phy, devad, reg, val);
pm_runtime_mark_last_busy(bus->parent);
pm_runtime_put_autosuspend(bus->parent);
return ret;
}
static int davinci_mdio_common_reset(struct davinci_mdio_data *data)
{
u32 phy_mask, ver;
int ret;
ret = pm_runtime_resume_and_get(data->dev);
if (ret < 0)
return ret;
if (data->manual_mode) {
davinci_mdio_disable(data);
davinci_mdio_enable_manual_mode(data);
}
/* wait for scan logic to settle */
msleep(PHY_MAX_ADDR * data->access_time);
/* dump hardware version info */
ver = readl(&data->regs->version);
dev_info(data->dev,
"davinci mdio revision %d.%d, bus freq %ld\n",
(ver >> 8) & 0xff, ver & 0xff,
data->pdata.bus_freq);
if (data->skip_scan)
goto done;
/* get phy mask from the alive register */
phy_mask = readl(&data->regs->alive);
if (phy_mask) {
/* restrict mdio bus to live phys only */
dev_info(data->dev, "detected phy mask %x\n", ~phy_mask);
phy_mask = ~phy_mask;
} else {
/* desperately scan all phys */
dev_warn(data->dev, "no live phy, scanning all\n");
phy_mask = 0;
}
data->bus->phy_mask = phy_mask;
done:
pm_runtime_mark_last_busy(data->dev);
pm_runtime_put_autosuspend(data->dev);
return 0;
}
static int davinci_mdio_reset(struct mii_bus *bus)
{
struct davinci_mdio_data *data = bus->priv;
return davinci_mdio_common_reset(data);
}
static int davinci_mdiobb_reset(struct mii_bus *bus)
{
struct mdiobb_ctrl *ctrl = bus->priv;
struct davinci_mdio_data *data;
data = container_of(ctrl, struct davinci_mdio_data, bb_ctrl);
return davinci_mdio_common_reset(data);
}
/* wait until hardware is ready for another user access */
static inline int wait_for_user_access(struct davinci_mdio_data *data)
{
struct davinci_mdio_regs __iomem *regs = data->regs;
unsigned long timeout = jiffies + msecs_to_jiffies(MDIO_TIMEOUT);
u32 reg;
while (time_after(timeout, jiffies)) {
reg = readl(&regs->user[0].access);
if ((reg & USERACCESS_GO) == 0)
return 0;
reg = readl(&regs->control);
if ((reg & CONTROL_IDLE) == 0) {
usleep_range(100, 200);
continue;
}
/*
* An emac soft_reset may have clobbered the mdio controller's
* state machine. We need to reset and retry the current
* operation
*/
dev_warn(data->dev, "resetting idled controller\n");
davinci_mdio_enable(data);
return -EAGAIN;
}
reg = readl(&regs->user[0].access);
if ((reg & USERACCESS_GO) == 0)
return 0;
dev_err(data->dev, "timed out waiting for user access\n");
return -ETIMEDOUT;
}
/* wait until hardware state machine is idle */
static inline int wait_for_idle(struct davinci_mdio_data *data)
{
struct davinci_mdio_regs __iomem *regs = data->regs;
u32 val, ret;
ret = readl_poll_timeout(&regs->control, val, val & CONTROL_IDLE,
0, MDIO_TIMEOUT * 1000);
if (ret)
dev_err(data->dev, "timed out waiting for idle\n");
return ret;
}
static int davinci_mdio_read(struct mii_bus *bus, int phy_id, int phy_reg)
{
struct davinci_mdio_data *data = bus->priv;
u32 reg;
int ret;
if (phy_reg & ~PHY_REG_MASK || phy_id & ~PHY_ID_MASK)
return -EINVAL;
ret = pm_runtime_resume_and_get(data->dev);
if (ret < 0)
return ret;
reg = (USERACCESS_GO | USERACCESS_READ | (phy_reg << 21) |
(phy_id << 16));
while (1) {
ret = wait_for_user_access(data);
if (ret == -EAGAIN)
continue;
if (ret < 0)
break;
writel(reg, &data->regs->user[0].access);
ret = wait_for_user_access(data);
if (ret == -EAGAIN)
continue;
if (ret < 0)
break;
reg = readl(&data->regs->user[0].access);
ret = (reg & USERACCESS_ACK) ? (reg & USERACCESS_DATA) : -EIO;
break;
}
pm_runtime_mark_last_busy(data->dev);
pm_runtime_put_autosuspend(data->dev);
return ret;
}
static int davinci_mdio_write(struct mii_bus *bus, int phy_id,
int phy_reg, u16 phy_data)
{
struct davinci_mdio_data *data = bus->priv;
u32 reg;
int ret;
if (phy_reg & ~PHY_REG_MASK || phy_id & ~PHY_ID_MASK)
return -EINVAL;
ret = pm_runtime_resume_and_get(data->dev);
if (ret < 0)
return ret;
reg = (USERACCESS_GO | USERACCESS_WRITE | (phy_reg << 21) |
(phy_id << 16) | (phy_data & USERACCESS_DATA));
while (1) {
ret = wait_for_user_access(data);
if (ret == -EAGAIN)
continue;
if (ret < 0)
break;
writel(reg, &data->regs->user[0].access);
ret = wait_for_user_access(data);
if (ret == -EAGAIN)
continue;
break;
}
pm_runtime_mark_last_busy(data->dev);
pm_runtime_put_autosuspend(data->dev);
return ret;
}
static int davinci_mdio_probe_dt(struct mdio_platform_data *data,
struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
u32 prop;
if (!node)
return -EINVAL;
if (of_property_read_u32(node, "bus_freq", &prop)) {
dev_err(&pdev->dev, "Missing bus_freq property in the DT.\n");
return -EINVAL;
}
data->bus_freq = prop;
return 0;
}
struct k3_mdio_soc_data {
bool manual_mode;
};
static const struct k3_mdio_soc_data am65_mdio_soc_data = {
.manual_mode = true,
};
static const struct soc_device_attribute k3_mdio_socinfo[] = {
{ .family = "AM62X", .data = &am65_mdio_soc_data },
{ .family = "AM64X", .data = &am65_mdio_soc_data },
{ .family = "AM65X", .data = &am65_mdio_soc_data },
{ .family = "J7200", .data = &am65_mdio_soc_data },
{ .family = "J721E", .data = &am65_mdio_soc_data },
{ .family = "J721S2", .data = &am65_mdio_soc_data },
{ /* sentinel */ },
};
#if IS_ENABLED(CONFIG_OF)
static const struct davinci_mdio_of_param of_cpsw_mdio_data = {
.autosuspend_delay_ms = 100,
};
static const struct of_device_id davinci_mdio_of_mtable[] = {
{ .compatible = "ti,davinci_mdio", },
{ .compatible = "ti,cpsw-mdio", .data = &of_cpsw_mdio_data},
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, davinci_mdio_of_mtable);
#endif
static const struct mdiobb_ops davinci_mdiobb_ops = {
.owner = THIS_MODULE,
.set_mdc = davinci_set_mdc,
.set_mdio_dir = davinci_set_mdio_dir,
.set_mdio_data = davinci_set_mdio_data,
.get_mdio_data = davinci_get_mdio_data,
};
static int davinci_mdio_probe(struct platform_device *pdev)
{
struct mdio_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct device *dev = &pdev->dev;
struct davinci_mdio_data *data;
struct resource *res;
struct phy_device *phy;
int ret, addr;
int autosuspend_delay_ms = -1;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->manual_mode = false;
data->bb_ctrl.ops = &davinci_mdiobb_ops;
if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
const struct soc_device_attribute *soc_match_data;
soc_match_data = soc_device_match(k3_mdio_socinfo);
if (soc_match_data && soc_match_data->data) {
const struct k3_mdio_soc_data *socdata =
soc_match_data->data;
data->manual_mode = socdata->manual_mode;
}
}
if (data->manual_mode)
data->bus = alloc_mdio_bitbang(&data->bb_ctrl);
else
data->bus = devm_mdiobus_alloc(dev);
if (!data->bus) {
dev_err(dev, "failed to alloc mii bus\n");
return -ENOMEM;
}
if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
const struct davinci_mdio_of_param *of_mdio_data;
ret = davinci_mdio_probe_dt(&data->pdata, pdev);
if (ret)
return ret;
snprintf(data->bus->id, MII_BUS_ID_SIZE, "%s", pdev->name);
of_mdio_data = of_device_get_match_data(&pdev->dev);
if (of_mdio_data) {
autosuspend_delay_ms =
of_mdio_data->autosuspend_delay_ms;
}
} else {
data->pdata = pdata ? (*pdata) : default_pdata;
snprintf(data->bus->id, MII_BUS_ID_SIZE, "%s-%x",
pdev->name, pdev->id);
}
data->bus->name = dev_name(dev);
if (data->manual_mode) {
data->bus->read = davinci_mdiobb_read_c22;
data->bus->write = davinci_mdiobb_write_c22;
data->bus->read_c45 = davinci_mdiobb_read_c45;
data->bus->write_c45 = davinci_mdiobb_write_c45;
data->bus->reset = davinci_mdiobb_reset;
dev_info(dev, "Configuring MDIO in manual mode\n");
} else {
data->bus->read = davinci_mdio_read;
data->bus->write = davinci_mdio_write;
data->bus->reset = davinci_mdio_reset;
data->bus->priv = data;
}
data->bus->parent = dev;
data->clk = devm_clk_get(dev, "fck");
if (IS_ERR(data->clk)) {
dev_err(dev, "failed to get device clock\n");
return PTR_ERR(data->clk);
}
dev_set_drvdata(dev, data);
data->dev = dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
data->regs = devm_ioremap(dev, res->start, resource_size(res));
if (!data->regs)
return -ENOMEM;
davinci_mdio_init_clk(data);
pm_runtime_set_autosuspend_delay(&pdev->dev, autosuspend_delay_ms);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_enable(&pdev->dev);
/* register the mii bus
* Create PHYs from DT only in case if PHY child nodes are explicitly
* defined to support backward compatibility with DTs which assume that
* Davinci MDIO will always scan the bus for PHYs detection.
*/
if (dev->of_node && of_get_child_count(dev->of_node))
data->skip_scan = true;
ret = of_mdiobus_register(data->bus, dev->of_node);
if (ret)
goto bail_out;
/* scan and dump the bus */
for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
phy = mdiobus_get_phy(data->bus, addr);
if (phy) {
dev_info(dev, "phy[%d]: device %s, driver %s\n",
phy->mdio.addr, phydev_name(phy),
phy->drv ? phy->drv->name : "unknown");
}
}
return 0;
bail_out:
pm_runtime_dont_use_autosuspend(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return ret;
}
static void davinci_mdio_remove(struct platform_device *pdev)
{
struct davinci_mdio_data *data = platform_get_drvdata(pdev);
if (data->bus) {
mdiobus_unregister(data->bus);
if (data->manual_mode)
free_mdio_bitbang(data->bus);
}
pm_runtime_dont_use_autosuspend(&pdev->dev);
pm_runtime_disable(&pdev->dev);
}
#ifdef CONFIG_PM
static int davinci_mdio_runtime_suspend(struct device *dev)
{
struct davinci_mdio_data *data = dev_get_drvdata(dev);
u32 ctrl;
/* shutdown the scan state machine */
ctrl = readl(&data->regs->control);
ctrl &= ~CONTROL_ENABLE;
writel(ctrl, &data->regs->control);
if (!data->manual_mode)
wait_for_idle(data);
return 0;
}
static int davinci_mdio_runtime_resume(struct device *dev)
{
struct davinci_mdio_data *data = dev_get_drvdata(dev);
if (data->manual_mode) {
davinci_mdio_disable(data);
davinci_mdio_enable_manual_mode(data);
} else {
davinci_mdio_enable(data);
}
return 0;
}
#endif
#ifdef CONFIG_PM_SLEEP
static int davinci_mdio_suspend(struct device *dev)
{
struct davinci_mdio_data *data = dev_get_drvdata(dev);
int ret = 0;
data->active_in_suspend = !pm_runtime_status_suspended(dev);
if (data->active_in_suspend)
ret = pm_runtime_force_suspend(dev);
if (ret < 0)
return ret;
/* Select sleep pin state */
pinctrl_pm_select_sleep_state(dev);
return 0;
}
static int davinci_mdio_resume(struct device *dev)
{
struct davinci_mdio_data *data = dev_get_drvdata(dev);
/* Select default pin state */
pinctrl_pm_select_default_state(dev);
if (data->active_in_suspend)
pm_runtime_force_resume(dev);
return 0;
}
#endif
static const struct dev_pm_ops davinci_mdio_pm_ops = {
SET_RUNTIME_PM_OPS(davinci_mdio_runtime_suspend,
davinci_mdio_runtime_resume, NULL)
SET_LATE_SYSTEM_SLEEP_PM_OPS(davinci_mdio_suspend, davinci_mdio_resume)
};
static struct platform_driver davinci_mdio_driver = {
.driver = {
.name = "davinci_mdio",
.pm = &davinci_mdio_pm_ops,
.of_match_table = of_match_ptr(davinci_mdio_of_mtable),
},
.probe = davinci_mdio_probe,
.remove_new = davinci_mdio_remove,
};
static int __init davinci_mdio_init(void)
{
return platform_driver_register(&davinci_mdio_driver);
}
device_initcall(davinci_mdio_init);
static void __exit davinci_mdio_exit(void)
{
platform_driver_unregister(&davinci_mdio_driver);
}
module_exit(davinci_mdio_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("DaVinci MDIO driver");