diff options
Diffstat (limited to 'drivers/phy/phy-pxa-28nm-hsic.c')
| -rw-r--r-- | drivers/phy/phy-pxa-28nm-hsic.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/drivers/phy/phy-pxa-28nm-hsic.c b/drivers/phy/phy-pxa-28nm-hsic.c new file mode 100644 index 000000000..234aacf4d --- /dev/null +++ b/drivers/phy/phy-pxa-28nm-hsic.c @@ -0,0 +1,220 @@ +/* + * Copyright (C) 2015 Linaro, Ltd. + * Rob Herring <robh@kernel.org> + * + * Based on vendor driver: + * Copyright (C) 2013 Marvell Inc. + * Author: Chao Xie <xiechao.mail@gmail.com> + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/of.h> +#include <linux/io.h> +#include <linux/err.h> +#include <linux/clk.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/phy/phy.h> + +#define PHY_28NM_HSIC_CTRL 0x08 +#define PHY_28NM_HSIC_IMPCAL_CAL 0x18 +#define PHY_28NM_HSIC_PLL_CTRL01 0x1c +#define PHY_28NM_HSIC_PLL_CTRL2 0x20 +#define PHY_28NM_HSIC_INT 0x28 + +#define PHY_28NM_HSIC_PLL_SELLPFR_SHIFT 26 +#define PHY_28NM_HSIC_PLL_FBDIV_SHIFT 0 +#define PHY_28NM_HSIC_PLL_REFDIV_SHIFT 9 + +#define PHY_28NM_HSIC_S2H_PU_PLL BIT(10) +#define PHY_28NM_HSIC_H2S_PLL_LOCK BIT(15) +#define PHY_28NM_HSIC_S2H_HSIC_EN BIT(7) +#define S2H_DRV_SE0_4RESUME BIT(14) +#define PHY_28NM_HSIC_H2S_IMPCAL_DONE BIT(27) + +#define PHY_28NM_HSIC_CONNECT_INT BIT(1) +#define PHY_28NM_HSIC_HS_READY_INT BIT(2) + +struct mv_hsic_phy { + struct phy *phy; + struct platform_device *pdev; + void __iomem *base; + struct clk *clk; +}; + +static bool wait_for_reg(void __iomem *reg, u32 mask, unsigned long timeout) +{ + timeout += jiffies; + while (time_is_after_eq_jiffies(timeout)) { + if ((readl(reg) & mask) == mask) + return true; + msleep(1); + } + return false; +} + +static int mv_hsic_phy_init(struct phy *phy) +{ + struct mv_hsic_phy *mv_phy = phy_get_drvdata(phy); + struct platform_device *pdev = mv_phy->pdev; + void __iomem *base = mv_phy->base; + + clk_prepare_enable(mv_phy->clk); + + /* Set reference clock */ + writel(0x1 << PHY_28NM_HSIC_PLL_SELLPFR_SHIFT | + 0xf0 << PHY_28NM_HSIC_PLL_FBDIV_SHIFT | + 0xd << PHY_28NM_HSIC_PLL_REFDIV_SHIFT, + base + PHY_28NM_HSIC_PLL_CTRL01); + + /* Turn on PLL */ + writel(readl(base + PHY_28NM_HSIC_PLL_CTRL2) | + PHY_28NM_HSIC_S2H_PU_PLL, + base + PHY_28NM_HSIC_PLL_CTRL2); + + /* Make sure PHY PLL is locked */ + if (!wait_for_reg(base + PHY_28NM_HSIC_PLL_CTRL2, + PHY_28NM_HSIC_H2S_PLL_LOCK, HZ / 10)) { + dev_err(&pdev->dev, "HSIC PHY PLL not locked after 100mS."); + clk_disable_unprepare(mv_phy->clk); + return -ETIMEDOUT; + } + + return 0; +} + +static int mv_hsic_phy_power_on(struct phy *phy) +{ + struct mv_hsic_phy *mv_phy = phy_get_drvdata(phy); + struct platform_device *pdev = mv_phy->pdev; + void __iomem *base = mv_phy->base; + u32 reg; + + reg = readl(base + PHY_28NM_HSIC_CTRL); + /* Avoid SE0 state when resume for some device will take it as reset */ + reg &= ~S2H_DRV_SE0_4RESUME; + reg |= PHY_28NM_HSIC_S2H_HSIC_EN; /* Enable HSIC PHY */ + writel(reg, base + PHY_28NM_HSIC_CTRL); + + /* + * Calibration Timing + * ____________________________ + * CAL START ___| + * ____________________ + * CAL_DONE ___________| + * | 400us | + */ + + /* Make sure PHY Calibration is ready */ + if (!wait_for_reg(base + PHY_28NM_HSIC_IMPCAL_CAL, + PHY_28NM_HSIC_H2S_IMPCAL_DONE, HZ / 10)) { + dev_warn(&pdev->dev, "HSIC PHY READY not set after 100mS."); + return -ETIMEDOUT; + } + + /* Waiting for HSIC connect int*/ + if (!wait_for_reg(base + PHY_28NM_HSIC_INT, + PHY_28NM_HSIC_CONNECT_INT, HZ / 5)) { + dev_warn(&pdev->dev, "HSIC wait for connect interrupt timeout."); + return -ETIMEDOUT; + } + + return 0; +} + +static int mv_hsic_phy_power_off(struct phy *phy) +{ + struct mv_hsic_phy *mv_phy = phy_get_drvdata(phy); + void __iomem *base = mv_phy->base; + + writel(readl(base + PHY_28NM_HSIC_CTRL) & ~PHY_28NM_HSIC_S2H_HSIC_EN, + base + PHY_28NM_HSIC_CTRL); + + return 0; +} + +static int mv_hsic_phy_exit(struct phy *phy) +{ + struct mv_hsic_phy *mv_phy = phy_get_drvdata(phy); + void __iomem *base = mv_phy->base; + + /* Turn off PLL */ + writel(readl(base + PHY_28NM_HSIC_PLL_CTRL2) & + ~PHY_28NM_HSIC_S2H_PU_PLL, + base + PHY_28NM_HSIC_PLL_CTRL2); + + clk_disable_unprepare(mv_phy->clk); + return 0; +} + + +static const struct phy_ops hsic_ops = { + .init = mv_hsic_phy_init, + .power_on = mv_hsic_phy_power_on, + .power_off = mv_hsic_phy_power_off, + .exit = mv_hsic_phy_exit, + .owner = THIS_MODULE, +}; + +static int mv_hsic_phy_probe(struct platform_device *pdev) +{ + struct phy_provider *phy_provider; + struct mv_hsic_phy *mv_phy; + struct resource *r; + + mv_phy = devm_kzalloc(&pdev->dev, sizeof(*mv_phy), GFP_KERNEL); + if (!mv_phy) + return -ENOMEM; + + mv_phy->pdev = pdev; + + mv_phy->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(mv_phy->clk)) { + dev_err(&pdev->dev, "failed to get clock.\n"); + return PTR_ERR(mv_phy->clk); + } + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mv_phy->base = devm_ioremap_resource(&pdev->dev, r); + if (IS_ERR(mv_phy->base)) + return PTR_ERR(mv_phy->base); + + mv_phy->phy = devm_phy_create(&pdev->dev, pdev->dev.of_node, &hsic_ops); + if (IS_ERR(mv_phy->phy)) + return PTR_ERR(mv_phy->phy); + + phy_set_drvdata(mv_phy->phy, mv_phy); + + phy_provider = devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate); + return PTR_ERR_OR_ZERO(phy_provider); +} + +static const struct of_device_id mv_hsic_phy_dt_match[] = { + { .compatible = "marvell,pxa1928-hsic-phy", }, + {}, +}; +MODULE_DEVICE_TABLE(of, mv_hsic_phy_dt_match); + +static struct platform_driver mv_hsic_phy_driver = { + .probe = mv_hsic_phy_probe, + .driver = { + .name = "mv-hsic-phy", + .of_match_table = of_match_ptr(mv_hsic_phy_dt_match), + }, +}; +module_platform_driver(mv_hsic_phy_driver); + +MODULE_AUTHOR("Rob Herring <robh@kernel.org>"); +MODULE_DESCRIPTION("Marvell HSIC phy driver"); +MODULE_LICENSE("GPL v2"); |