2014-07-07 04:16:07 -06:00
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/*
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* Marvell Berlin SATA PHY driver
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*
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* Copyright (C) 2014 Marvell Technology Group Ltd.
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*
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* Antoine Ténart <antoine.tenart@free-electrons.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <linux/phy/phy.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#define HOST_VSA_ADDR 0x0
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#define HOST_VSA_DATA 0x4
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#define PORT_SCR_CTL 0x2c
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#define PORT_VSR_ADDR 0x78
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#define PORT_VSR_DATA 0x7c
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#define CONTROL_REGISTER 0x0
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#define MBUS_SIZE_CONTROL 0x4
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#define POWER_DOWN_PHY0 BIT(6)
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#define POWER_DOWN_PHY1 BIT(14)
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#define MBUS_WRITE_REQUEST_SIZE_128 (BIT(2) << 16)
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#define MBUS_READ_REQUEST_SIZE_128 (BIT(2) << 19)
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2014-10-30 04:21:24 -06:00
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#define BG2Q_PHY_BASE 0x200
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2014-07-07 04:16:07 -06:00
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/* register 0x01 */
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#define REF_FREF_SEL_25 BIT(0)
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#define PHY_MODE_SATA (0x0 << 5)
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/* register 0x02 */
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#define USE_MAX_PLL_RATE BIT(12)
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/* register 0x23 */
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#define DATA_BIT_WIDTH_10 (0x0 << 10)
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#define DATA_BIT_WIDTH_20 (0x1 << 10)
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#define DATA_BIT_WIDTH_40 (0x2 << 10)
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/* register 0x25 */
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#define PHY_GEN_MAX_1_5 (0x0 << 10)
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#define PHY_GEN_MAX_3_0 (0x1 << 10)
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#define PHY_GEN_MAX_6_0 (0x2 << 10)
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struct phy_berlin_desc {
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struct phy *phy;
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u32 power_bit;
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unsigned index;
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};
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struct phy_berlin_priv {
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void __iomem *base;
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spinlock_t lock;
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struct clk *clk;
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struct phy_berlin_desc **phys;
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unsigned nphys;
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2014-10-30 04:21:24 -06:00
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u32 phy_base;
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2014-07-07 04:16:07 -06:00
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};
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2014-10-30 04:21:24 -06:00
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static inline void phy_berlin_sata_reg_setbits(void __iomem *ctrl_reg,
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u32 phy_base, u32 reg, u32 mask, u32 val)
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2014-07-07 04:16:07 -06:00
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{
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u32 regval;
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/* select register */
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2014-10-30 04:21:24 -06:00
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writel(phy_base + reg, ctrl_reg + PORT_VSR_ADDR);
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2014-07-07 04:16:07 -06:00
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/* set bits */
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regval = readl(ctrl_reg + PORT_VSR_DATA);
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regval &= ~mask;
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regval |= val;
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writel(regval, ctrl_reg + PORT_VSR_DATA);
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}
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static int phy_berlin_sata_power_on(struct phy *phy)
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{
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struct phy_berlin_desc *desc = phy_get_drvdata(phy);
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struct phy_berlin_priv *priv = dev_get_drvdata(phy->dev.parent);
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void __iomem *ctrl_reg = priv->base + 0x60 + (desc->index * 0x80);
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int ret = 0;
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u32 regval;
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clk_prepare_enable(priv->clk);
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spin_lock(&priv->lock);
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/* Power on PHY */
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writel(CONTROL_REGISTER, priv->base + HOST_VSA_ADDR);
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regval = readl(priv->base + HOST_VSA_DATA);
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regval &= ~desc->power_bit;
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writel(regval, priv->base + HOST_VSA_DATA);
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/* Configure MBus */
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writel(MBUS_SIZE_CONTROL, priv->base + HOST_VSA_ADDR);
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regval = readl(priv->base + HOST_VSA_DATA);
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regval |= MBUS_WRITE_REQUEST_SIZE_128 | MBUS_READ_REQUEST_SIZE_128;
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writel(regval, priv->base + HOST_VSA_DATA);
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/* set PHY mode and ref freq to 25 MHz */
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phy_berlin_sata_reg_setbits(ctrl_reg, priv->phy_base, 0x01,
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0x00ff, REF_FREF_SEL_25 | PHY_MODE_SATA);
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2014-07-07 04:16:07 -06:00
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/* set PHY up to 6 Gbps */
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2014-10-30 04:21:24 -06:00
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phy_berlin_sata_reg_setbits(ctrl_reg, priv->phy_base, 0x25,
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0x0c00, PHY_GEN_MAX_6_0);
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2014-07-07 04:16:07 -06:00
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/* set 40 bits width */
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phy_berlin_sata_reg_setbits(ctrl_reg, priv->phy_base, 0x23,
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0x0c00, DATA_BIT_WIDTH_40);
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2014-07-07 04:16:07 -06:00
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/* use max pll rate */
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2014-10-30 04:21:24 -06:00
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phy_berlin_sata_reg_setbits(ctrl_reg, priv->phy_base, 0x02,
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0x0000, USE_MAX_PLL_RATE);
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2014-07-07 04:16:07 -06:00
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/* set Gen3 controller speed */
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regval = readl(ctrl_reg + PORT_SCR_CTL);
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regval &= ~GENMASK(7, 4);
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regval |= 0x30;
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writel(regval, ctrl_reg + PORT_SCR_CTL);
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spin_unlock(&priv->lock);
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clk_disable_unprepare(priv->clk);
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return ret;
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}
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static int phy_berlin_sata_power_off(struct phy *phy)
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{
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struct phy_berlin_desc *desc = phy_get_drvdata(phy);
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struct phy_berlin_priv *priv = dev_get_drvdata(phy->dev.parent);
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u32 regval;
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clk_prepare_enable(priv->clk);
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spin_lock(&priv->lock);
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/* Power down PHY */
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writel(CONTROL_REGISTER, priv->base + HOST_VSA_ADDR);
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regval = readl(priv->base + HOST_VSA_DATA);
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regval |= desc->power_bit;
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writel(regval, priv->base + HOST_VSA_DATA);
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spin_unlock(&priv->lock);
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clk_disable_unprepare(priv->clk);
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return 0;
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}
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static struct phy *phy_berlin_sata_phy_xlate(struct device *dev,
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struct of_phandle_args *args)
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{
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struct phy_berlin_priv *priv = dev_get_drvdata(dev);
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int i;
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if (WARN_ON(args->args[0] >= priv->nphys))
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return ERR_PTR(-ENODEV);
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for (i = 0; i < priv->nphys; i++) {
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if (priv->phys[i]->index == args->args[0])
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break;
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}
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if (i == priv->nphys)
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return ERR_PTR(-ENODEV);
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return priv->phys[i]->phy;
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}
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static struct phy_ops phy_berlin_sata_ops = {
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.power_on = phy_berlin_sata_power_on,
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.power_off = phy_berlin_sata_power_off,
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.owner = THIS_MODULE,
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};
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static u32 phy_berlin_power_down_bits[] = {
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POWER_DOWN_PHY0,
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POWER_DOWN_PHY1,
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};
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static int phy_berlin_sata_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *child;
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struct phy *phy;
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struct phy_provider *phy_provider;
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struct phy_berlin_priv *priv;
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struct resource *res;
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int i = 0;
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u32 phy_id;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -EINVAL;
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priv->base = devm_ioremap(dev, res->start, resource_size(res));
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if (!priv->base)
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return -ENOMEM;
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priv->clk = devm_clk_get(dev, NULL);
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if (IS_ERR(priv->clk))
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return PTR_ERR(priv->clk);
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priv->nphys = of_get_child_count(dev->of_node);
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if (priv->nphys == 0)
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return -ENODEV;
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priv->phys = devm_kzalloc(dev, priv->nphys * sizeof(*priv->phys),
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GFP_KERNEL);
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if (!priv->phys)
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return -ENOMEM;
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2014-10-30 04:21:24 -06:00
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priv->phy_base = BG2Q_PHY_BASE;
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2014-07-07 04:16:07 -06:00
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dev_set_drvdata(dev, priv);
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spin_lock_init(&priv->lock);
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for_each_available_child_of_node(dev->of_node, child) {
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struct phy_berlin_desc *phy_desc;
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if (of_property_read_u32(child, "reg", &phy_id)) {
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dev_err(dev, "missing reg property in node %s\n",
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child->name);
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return -EINVAL;
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}
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if (phy_id >= ARRAY_SIZE(phy_berlin_power_down_bits)) {
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dev_err(dev, "invalid reg in node %s\n", child->name);
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return -EINVAL;
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}
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phy_desc = devm_kzalloc(dev, sizeof(*phy_desc), GFP_KERNEL);
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if (!phy_desc)
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return -ENOMEM;
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2014-07-14 04:25:02 -06:00
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phy = devm_phy_create(dev, NULL, &phy_berlin_sata_ops, NULL);
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if (IS_ERR(phy)) {
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dev_err(dev, "failed to create PHY %d\n", phy_id);
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return PTR_ERR(phy);
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}
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phy_desc->phy = phy;
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phy_desc->power_bit = phy_berlin_power_down_bits[phy_id];
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phy_desc->index = phy_id;
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phy_set_drvdata(phy, phy_desc);
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priv->phys[i++] = phy_desc;
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/* Make sure the PHY is off */
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phy_berlin_sata_power_off(phy);
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}
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phy_provider =
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devm_of_phy_provider_register(dev, phy_berlin_sata_phy_xlate);
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if (IS_ERR(phy_provider))
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return PTR_ERR(phy_provider);
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return 0;
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}
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static const struct of_device_id phy_berlin_sata_of_match[] = {
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{ .compatible = "marvell,berlin2q-sata-phy" },
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{ },
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};
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static struct platform_driver phy_berlin_sata_driver = {
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.probe = phy_berlin_sata_probe,
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.driver = {
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.name = "phy-berlin-sata",
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.of_match_table = phy_berlin_sata_of_match,
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},
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};
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module_platform_driver(phy_berlin_sata_driver);
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MODULE_DESCRIPTION("Marvell Berlin SATA PHY driver");
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MODULE_AUTHOR("Antoine Ténart <antoine.tenart@free-electrons.com>");
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MODULE_LICENSE("GPL v2");
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