linux/drivers/phy/marvell/phy-berlin-sata.c
Vivek Gautam 0b56e9a7e8 phy: Group vendor specific phy drivers
Adding vendor specific directories in phy to group
phy drivers under their respective vendor umbrella.

Also updated the MAINTAINERS file to reflect the correct
directory structure for phy drivers.

Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Cc: Stephen Boyd <stephen.boyd@linaro.org>
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-arm-msm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-omap@vger.kernel.org
Cc: linux-renesas-soc@vger.kernel.org
Cc: linux-rockchip@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-usb@vger.kernel.org
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
2017-06-01 15:28:33 +05:30

300 lines
7.2 KiB
C

/*
* Marvell Berlin SATA PHY driver
*
* Copyright (C) 2014 Marvell Technology Group Ltd.
*
* Antoine Ténart <antoine.tenart@free-electrons.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/phy/phy.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#define HOST_VSA_ADDR 0x0
#define HOST_VSA_DATA 0x4
#define PORT_SCR_CTL 0x2c
#define PORT_VSR_ADDR 0x78
#define PORT_VSR_DATA 0x7c
#define CONTROL_REGISTER 0x0
#define MBUS_SIZE_CONTROL 0x4
#define POWER_DOWN_PHY0 BIT(6)
#define POWER_DOWN_PHY1 BIT(14)
#define MBUS_WRITE_REQUEST_SIZE_128 (BIT(2) << 16)
#define MBUS_READ_REQUEST_SIZE_128 (BIT(2) << 19)
#define BG2_PHY_BASE 0x080
#define BG2Q_PHY_BASE 0x200
/* register 0x01 */
#define REF_FREF_SEL_25 BIT(0)
#define PHY_MODE_SATA (0x0 << 5)
/* register 0x02 */
#define USE_MAX_PLL_RATE BIT(12)
/* register 0x23 */
#define DATA_BIT_WIDTH_10 (0x0 << 10)
#define DATA_BIT_WIDTH_20 (0x1 << 10)
#define DATA_BIT_WIDTH_40 (0x2 << 10)
/* register 0x25 */
#define PHY_GEN_MAX_1_5 (0x0 << 10)
#define PHY_GEN_MAX_3_0 (0x1 << 10)
#define PHY_GEN_MAX_6_0 (0x2 << 10)
struct phy_berlin_desc {
struct phy *phy;
u32 power_bit;
unsigned index;
};
struct phy_berlin_priv {
void __iomem *base;
spinlock_t lock;
struct clk *clk;
struct phy_berlin_desc **phys;
unsigned nphys;
u32 phy_base;
};
static inline void phy_berlin_sata_reg_setbits(void __iomem *ctrl_reg,
u32 phy_base, u32 reg, u32 mask, u32 val)
{
u32 regval;
/* select register */
writel(phy_base + reg, ctrl_reg + PORT_VSR_ADDR);
/* set bits */
regval = readl(ctrl_reg + PORT_VSR_DATA);
regval &= ~mask;
regval |= val;
writel(regval, ctrl_reg + PORT_VSR_DATA);
}
static int phy_berlin_sata_power_on(struct phy *phy)
{
struct phy_berlin_desc *desc = phy_get_drvdata(phy);
struct phy_berlin_priv *priv = dev_get_drvdata(phy->dev.parent);
void __iomem *ctrl_reg = priv->base + 0x60 + (desc->index * 0x80);
u32 regval;
clk_prepare_enable(priv->clk);
spin_lock(&priv->lock);
/* Power on PHY */
writel(CONTROL_REGISTER, priv->base + HOST_VSA_ADDR);
regval = readl(priv->base + HOST_VSA_DATA);
regval &= ~desc->power_bit;
writel(regval, priv->base + HOST_VSA_DATA);
/* Configure MBus */
writel(MBUS_SIZE_CONTROL, priv->base + HOST_VSA_ADDR);
regval = readl(priv->base + HOST_VSA_DATA);
regval |= MBUS_WRITE_REQUEST_SIZE_128 | MBUS_READ_REQUEST_SIZE_128;
writel(regval, priv->base + HOST_VSA_DATA);
/* set PHY mode and ref freq to 25 MHz */
phy_berlin_sata_reg_setbits(ctrl_reg, priv->phy_base, 0x01,
0x00ff, REF_FREF_SEL_25 | PHY_MODE_SATA);
/* set PHY up to 6 Gbps */
phy_berlin_sata_reg_setbits(ctrl_reg, priv->phy_base, 0x25,
0x0c00, PHY_GEN_MAX_6_0);
/* set 40 bits width */
phy_berlin_sata_reg_setbits(ctrl_reg, priv->phy_base, 0x23,
0x0c00, DATA_BIT_WIDTH_40);
/* use max pll rate */
phy_berlin_sata_reg_setbits(ctrl_reg, priv->phy_base, 0x02,
0x0000, USE_MAX_PLL_RATE);
/* set Gen3 controller speed */
regval = readl(ctrl_reg + PORT_SCR_CTL);
regval &= ~GENMASK(7, 4);
regval |= 0x30;
writel(regval, ctrl_reg + PORT_SCR_CTL);
spin_unlock(&priv->lock);
clk_disable_unprepare(priv->clk);
return 0;
}
static int phy_berlin_sata_power_off(struct phy *phy)
{
struct phy_berlin_desc *desc = phy_get_drvdata(phy);
struct phy_berlin_priv *priv = dev_get_drvdata(phy->dev.parent);
u32 regval;
clk_prepare_enable(priv->clk);
spin_lock(&priv->lock);
/* Power down PHY */
writel(CONTROL_REGISTER, priv->base + HOST_VSA_ADDR);
regval = readl(priv->base + HOST_VSA_DATA);
regval |= desc->power_bit;
writel(regval, priv->base + HOST_VSA_DATA);
spin_unlock(&priv->lock);
clk_disable_unprepare(priv->clk);
return 0;
}
static struct phy *phy_berlin_sata_phy_xlate(struct device *dev,
struct of_phandle_args *args)
{
struct phy_berlin_priv *priv = dev_get_drvdata(dev);
int i;
if (WARN_ON(args->args[0] >= priv->nphys))
return ERR_PTR(-ENODEV);
for (i = 0; i < priv->nphys; i++) {
if (priv->phys[i]->index == args->args[0])
break;
}
if (i == priv->nphys)
return ERR_PTR(-ENODEV);
return priv->phys[i]->phy;
}
static const struct phy_ops phy_berlin_sata_ops = {
.power_on = phy_berlin_sata_power_on,
.power_off = phy_berlin_sata_power_off,
.owner = THIS_MODULE,
};
static u32 phy_berlin_power_down_bits[] = {
POWER_DOWN_PHY0,
POWER_DOWN_PHY1,
};
static int phy_berlin_sata_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *child;
struct phy *phy;
struct phy_provider *phy_provider;
struct phy_berlin_priv *priv;
struct resource *res;
int ret, i = 0;
u32 phy_id;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
priv->base = devm_ioremap(dev, res->start, resource_size(res));
if (!priv->base)
return -ENOMEM;
priv->clk = devm_clk_get(dev, NULL);
if (IS_ERR(priv->clk))
return PTR_ERR(priv->clk);
priv->nphys = of_get_child_count(dev->of_node);
if (priv->nphys == 0)
return -ENODEV;
priv->phys = devm_kcalloc(dev, priv->nphys, sizeof(*priv->phys),
GFP_KERNEL);
if (!priv->phys)
return -ENOMEM;
if (of_device_is_compatible(dev->of_node, "marvell,berlin2-sata-phy"))
priv->phy_base = BG2_PHY_BASE;
else
priv->phy_base = BG2Q_PHY_BASE;
dev_set_drvdata(dev, priv);
spin_lock_init(&priv->lock);
for_each_available_child_of_node(dev->of_node, child) {
struct phy_berlin_desc *phy_desc;
if (of_property_read_u32(child, "reg", &phy_id)) {
dev_err(dev, "missing reg property in node %s\n",
child->name);
ret = -EINVAL;
goto put_child;
}
if (phy_id >= ARRAY_SIZE(phy_berlin_power_down_bits)) {
dev_err(dev, "invalid reg in node %s\n", child->name);
ret = -EINVAL;
goto put_child;
}
phy_desc = devm_kzalloc(dev, sizeof(*phy_desc), GFP_KERNEL);
if (!phy_desc) {
ret = -ENOMEM;
goto put_child;
}
phy = devm_phy_create(dev, NULL, &phy_berlin_sata_ops);
if (IS_ERR(phy)) {
dev_err(dev, "failed to create PHY %d\n", phy_id);
ret = PTR_ERR(phy);
goto put_child;
}
phy_desc->phy = phy;
phy_desc->power_bit = phy_berlin_power_down_bits[phy_id];
phy_desc->index = phy_id;
phy_set_drvdata(phy, phy_desc);
priv->phys[i++] = phy_desc;
/* Make sure the PHY is off */
phy_berlin_sata_power_off(phy);
}
phy_provider =
devm_of_phy_provider_register(dev, phy_berlin_sata_phy_xlate);
return PTR_ERR_OR_ZERO(phy_provider);
put_child:
of_node_put(child);
return ret;
}
static const struct of_device_id phy_berlin_sata_of_match[] = {
{ .compatible = "marvell,berlin2-sata-phy" },
{ .compatible = "marvell,berlin2q-sata-phy" },
{ },
};
MODULE_DEVICE_TABLE(of, phy_berlin_sata_of_match);
static struct platform_driver phy_berlin_sata_driver = {
.probe = phy_berlin_sata_probe,
.driver = {
.name = "phy-berlin-sata",
.of_match_table = phy_berlin_sata_of_match,
},
};
module_platform_driver(phy_berlin_sata_driver);
MODULE_DESCRIPTION("Marvell Berlin SATA PHY driver");
MODULE_AUTHOR("Antoine Ténart <antoine.tenart@free-electrons.com>");
MODULE_LICENSE("GPL v2");