From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brian Norris Subject: [PATCH 4/5] phy: add Broadcom SATA3 PHY driver for Broadcom STB SoCs Date: Wed, 18 Mar 2015 18:23:41 -0700 Message-ID: <1426728222-8197-4-git-send-email-computersforpeace@gmail.com> References: <1426728222-8197-1-git-send-email-computersforpeace@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <1426728222-8197-1-git-send-email-computersforpeace@gmail.com> Sender: linux-kernel-owner@vger.kernel.org To: Tejun Heo , Kishon Vijay Abraham I Cc: Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Brian Norris , Gregory Fong , Florian Fainelli , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org List-Id: devicetree@vger.kernel.org Supports up to two ports which can each be powered on/off and configure= d independently. Signed-off-by: Brian Norris --- drivers/phy/Kconfig | 9 ++ drivers/phy/Makefile | 1 + drivers/phy/phy-brcmstb-sata.c | 333 +++++++++++++++++++++++++++++++++= ++++++++ 3 files changed, 343 insertions(+) create mode 100644 drivers/phy/phy-brcmstb-sata.c diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index 2962de205ba7..c8b22074bcf6 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -291,4 +291,13 @@ config PHY_QCOM_UFS help Support for UFS PHY on QCOM chipsets. =20 +config PHY_BRCMSTB_SATA + tristate "Broadcom STB SATA PHY driver" + depends on ARCH_BRCMSTB + depends on OF + select GENERIC_PHY + help + Enable this to support the SATA3 PHY on 28nm Broadcom STB SoCs. + Likely useful only with CONFIG_SATA_BRCMSTB enabled. + endmenu diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index f080e1bb2a74..28a10804b4f4 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -38,3 +38,4 @@ obj-$(CONFIG_PHY_STIH41X_USB) +=3D phy-stih41x-usb.o obj-$(CONFIG_PHY_QCOM_UFS) +=3D phy-qcom-ufs.o obj-$(CONFIG_PHY_QCOM_UFS) +=3D phy-qcom-ufs-qmp-20nm.o obj-$(CONFIG_PHY_QCOM_UFS) +=3D phy-qcom-ufs-qmp-14nm.o +obj-$(CONFIG_PHY_BRCMSTB_SATA) +=3D phy-brcmstb-sata.o diff --git a/drivers/phy/phy-brcmstb-sata.c b/drivers/phy/phy-brcmstb-s= ata.c new file mode 100644 index 000000000000..413bc94225ac --- /dev/null +++ b/drivers/phy/phy-brcmstb-sata.c @@ -0,0 +1,333 @@ +/* + * Broadcom SATA3 AHCI Controller PHY Driver + * + * Copyright =C2=A9 2009-2015 Broadcom Corporation + * + * This program is free software; you can redistribute it and/or modif= y + * it under the terms of the GNU General Public License as published b= y + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include + +#define SATA_MDIO_BANK_OFFSET 0x23c +#define SATA_MDIO_REG_OFFSET(ofs) ((ofs) * 4) +#define SATA_MDIO_REG_SPACE_SIZE 0x1000 +#define SATA_MDIO_REG_LENGTH 0x1f00 + +#define SATA_TOP_CTRL_PHY_CTRL_1 0x0 + #define SATA_TOP_CTRL_1_PHY_DEFAULT_POWER_STATE BIT(14) + +#define SATA_TOP_CTRL_PHY_CTRL_2 0x4 + #define SATA_TOP_CTRL_2_SW_RST_MDIOREG BIT(0) + #define SATA_TOP_CTRL_2_SW_RST_OOB BIT(1) + #define SATA_TOP_CTRL_2_SW_RST_RX BIT(2) + #define SATA_TOP_CTRL_2_SW_RST_TX BIT(3) + #define SATA_TOP_CTRL_2_PHY_GLOBAL_RESET BIT(14) + +#define MAX_PORTS 2 +/* Register offset between PHYs in port-ctrl */ +#define SATA_TOP_CTRL_PHY_CTRL_LEN 0x8 +/* Register offset between PHYs in PCB space */ +#define SATA_MDIO_REG_SPACE_SIZE 0x1000 + +struct brcm_sata_port { + int portnum; + struct phy *phy; + struct brcm_sata_phy *phy_priv; + bool ssc_en; +}; + +struct brcm_sata_phy { + struct device *dev; + void __iomem *port_ctrl; + void __iomem *phy_base; + + struct brcm_sata_port phys[MAX_PORTS]; +}; + +enum sata_mdio_phy_regs_28nm { + PLL_REG_BANK_0 =3D 0x50, + PLL_REG_BANK_0_PLLCONTROL_0 =3D 0x81, + + TXPMD_REG_BANK =3D 0x1a0, + TXPMD_CONTROL1 =3D 0x81, + TXPMD_CONTROL1_TX_SSC_EN_FRC =3D BIT(0), + TXPMD_CONTROL1_TX_SSC_EN_FRC_VAL =3D BIT(1), + TXPMD_TX_FREQ_CTRL_CONTROL1 =3D 0x82, + TXPMD_TX_FREQ_CTRL_CONTROL2 =3D 0x83, + TXPMD_TX_FREQ_CTRL_CONTROL2_FMIN_MASK =3D 0x3ff, + TXPMD_TX_FREQ_CTRL_CONTROL3 =3D 0x84, + TXPMD_TX_FREQ_CTRL_CONTROL3_FMAX_MASK =3D 0x3ff, +}; + +static inline void __iomem *sata_phy_get_port_ctrl(struct brcm_sata_po= rt *port) +{ + struct brcm_sata_phy *priv =3D port->phy_priv; + + return priv->port_ctrl + (port->portnum * SATA_TOP_CTRL_PHY_CTRL_LEN)= ; +} +static inline void __iomem *sata_phy_get_phy_base(struct brcm_sata_por= t *port) +{ + struct brcm_sata_phy *priv =3D port->phy_priv; + + return priv->phy_base + (port->portnum * SATA_MDIO_REG_SPACE_SIZE); +} + +static void brcm_sata_mdio_wr(void __iomem *addr, u32 bank, u32 ofs, + u32 msk, u32 value) +{ + u32 tmp; + + writel(bank, addr + SATA_MDIO_BANK_OFFSET); + tmp =3D readl(addr + SATA_MDIO_REG_OFFSET(ofs)); + tmp =3D (tmp & msk) | value; + writel(tmp, addr + SATA_MDIO_REG_OFFSET(ofs)); +} + +/* These defaults were characterized by H/W group */ +#define FMIN_VAL_DEFAULT 0x3df +#define FMAX_VAL_DEFAULT 0x3df +#define FMAX_VAL_SSC 0x83 + +static void cfg_ssc_28nm(struct brcm_sata_port *port) +{ + void __iomem *base =3D sata_phy_get_phy_base(port); + struct brcm_sata_phy *priv =3D port->phy_priv; + u32 tmp; + + /* override the TX spread spectrum setting */ + tmp =3D TXPMD_CONTROL1_TX_SSC_EN_FRC_VAL | TXPMD_CONTROL1_TX_SSC_EN_F= RC; + brcm_sata_mdio_wr(base, TXPMD_REG_BANK, TXPMD_CONTROL1, ~tmp, tmp); + + /* set fixed min freq */ + brcm_sata_mdio_wr(base, TXPMD_REG_BANK, TXPMD_TX_FREQ_CTRL_CONTROL2, + ~TXPMD_TX_FREQ_CTRL_CONTROL2_FMIN_MASK, + FMIN_VAL_DEFAULT); + + /* set fixed max freq depending on SSC config */ + if (port->ssc_en) { + dev_info(priv->dev, "enabling SSC on port %d\n", port->portnum); + tmp =3D FMAX_VAL_SSC; + } else { + tmp =3D FMAX_VAL_DEFAULT; + } + + brcm_sata_mdio_wr(base, TXPMD_REG_BANK, TXPMD_TX_FREQ_CTRL_CONTROL3, + ~TXPMD_TX_FREQ_CTRL_CONTROL3_FMAX_MASK, tmp); +} + +static void brcm_sata_phy_enable(struct brcm_sata_port *port) +{ + void __iomem *port_ctrl =3D sata_phy_get_port_ctrl(port); + void __iomem *p; + u32 reg; + + /* clear PHY_DEFAULT_POWER_STATE */ + p =3D port_ctrl + SATA_TOP_CTRL_PHY_CTRL_1; + reg =3D readl(p); + reg &=3D ~SATA_TOP_CTRL_1_PHY_DEFAULT_POWER_STATE; + writel(reg, p); + + /* reset the PHY digital logic */ + p =3D port_ctrl + SATA_TOP_CTRL_PHY_CTRL_2; + reg =3D readl(p); + reg &=3D ~(SATA_TOP_CTRL_2_SW_RST_MDIOREG | SATA_TOP_CTRL_2_SW_RST_OO= B | + SATA_TOP_CTRL_2_SW_RST_RX); + reg |=3D SATA_TOP_CTRL_2_SW_RST_TX; + writel(reg, p); + reg =3D readl(p); + reg |=3D SATA_TOP_CTRL_2_PHY_GLOBAL_RESET; + writel(reg, p); + reg =3D readl(p); + reg &=3D ~SATA_TOP_CTRL_2_PHY_GLOBAL_RESET; + writel(reg, p); + (void)readl(p); +} + +static void brcm_sata_phy_disable(struct brcm_sata_port *port) +{ + void __iomem *port_ctrl =3D sata_phy_get_port_ctrl(port); + void __iomem *p; + u32 reg; + + /* power-off the PHY digital logic */ + p =3D port_ctrl + SATA_TOP_CTRL_PHY_CTRL_2; + reg =3D readl(p); + reg |=3D (SATA_TOP_CTRL_2_SW_RST_MDIOREG | SATA_TOP_CTRL_2_SW_RST_OOB= | + SATA_TOP_CTRL_2_SW_RST_RX | SATA_TOP_CTRL_2_SW_RST_TX | + SATA_TOP_CTRL_2_PHY_GLOBAL_RESET); + writel(reg, p); + + /* set PHY_DEFAULT_POWER_STATE */ + p =3D port_ctrl + SATA_TOP_CTRL_PHY_CTRL_1; + reg =3D readl(p); + reg |=3D SATA_TOP_CTRL_1_PHY_DEFAULT_POWER_STATE; + writel(reg, p); +} + +static int brcmstb_sata_phy_power_on(struct phy *phy) +{ + struct brcm_sata_port *port =3D phy_get_drvdata(phy); + + dev_info(port->phy_priv->dev, "powering on port %d\n", port->portnum)= ; + + brcm_sata_phy_enable(port); + cfg_ssc_28nm(port); + + return 0; +} + +static int brcmstb_sata_phy_power_off(struct phy *phy) +{ + struct brcm_sata_port *port =3D phy_get_drvdata(phy); + + dev_info(port->phy_priv->dev, "powering off port %d\n", port->portnum= ); + + brcm_sata_phy_disable(port); + + return 0; +} + +static struct phy_ops phy_ops_28nm =3D { + .power_on =3D brcmstb_sata_phy_power_on, + .power_off =3D brcmstb_sata_phy_power_off, + .owner =3D THIS_MODULE, +}; + +static struct phy *brcm_sata_phy_xlate(struct device *dev, + struct of_phandle_args *args) +{ + struct brcm_sata_phy *priv =3D dev_get_drvdata(dev); + int i =3D args->args[0]; + + if (i >=3D MAX_PORTS || !priv->phys[i].phy) { + dev_err(dev, "invalid phy: %d\n", i); + return ERR_PTR(-ENODEV); + } + + return priv->phys[i].phy; +} + +static const struct of_device_id brcmstb_sata_phy_of_match[] =3D { + { .compatible =3D "brcm,bcm7445-sata-phy" }, + {}, +}; +MODULE_DEVICE_TABLE(of, brcmstb_sata_phy_of_match); + +static int brcmstb_sata_phy_probe(struct platform_device *pdev) +{ + struct device *dev =3D &pdev->dev; + struct device_node *dn =3D dev->of_node, *child; + struct brcm_sata_phy *priv; + struct resource *res; + struct phy_provider *provider; + int count =3D 0; + + if (of_get_child_count(dn) =3D=3D 0) + return -ENODEV; + + priv =3D devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + dev_set_drvdata(dev, priv); + priv->dev =3D dev; + + res =3D platform_get_resource_byname(pdev, IORESOURCE_MEM, "port-ctrl= "); + if (!res) { + dev_err(dev, "couldn't get port-ctrl resource\n"); + return -EINVAL; + } + /* + * Don't request region, since it may be within a region owned by the + * SATA driver + */ + priv->port_ctrl =3D devm_ioremap(dev, res->start, resource_size(res))= ; + if (!priv->port_ctrl) { + dev_err(dev, "couldn't remap: %pR\n", res); + return -ENOMEM; + } + + res =3D platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy"); + priv->phy_base =3D devm_ioremap_resource(dev, res); + if (IS_ERR(priv->phy_base)) + return PTR_ERR(priv->phy_base); + + for_each_available_child_of_node(dn, child) { + unsigned int id; + struct brcm_sata_port *port; + + if (of_property_read_u32(child, "reg", &id)) { + dev_err(dev, "missing reg property in node %s\n", + child->name); + return -EINVAL; + } + + if (id >=3D MAX_PORTS) { + dev_err(dev, "invalid reg: %u\n", id); + return -EINVAL; + } + if (priv->phys[id].phy) { + dev_err(dev, "already registered port %u\n", id); + return -EINVAL; + } + + port =3D &priv->phys[id]; + port->portnum =3D id; + port->phy_priv =3D priv; + port->phy =3D devm_phy_create(dev, NULL, &phy_ops_28nm); + port->ssc_en =3D of_property_read_bool(child, "brcm,enable-ssc"); + if (IS_ERR(port->phy)) { + dev_err(dev, "failed to create PHY\n"); + return PTR_ERR(port->phy); + } + + phy_set_drvdata(port->phy, port); + count++; + } + + provider =3D devm_of_phy_provider_register(dev, brcm_sata_phy_xlate); + if (IS_ERR(provider)) { + dev_err(dev, "could not register PHY provider\n"); + return PTR_ERR(provider); + } + + dev_info(dev, "registered %d ports\n", count); + + return 0; +} + +static int brcmstb_sata_phy_remove(struct platform_device *pdev) +{ + return 0; +} + +static struct platform_driver brcmstb_sata_phy_driver =3D { + .probe =3D brcmstb_sata_phy_probe, + .remove =3D brcmstb_sata_phy_remove, + .driver =3D { + .of_match_table =3D brcmstb_sata_phy_of_match, + .name =3D "brcmstb-sata-phy", + } +}; +module_platform_driver(brcmstb_sata_phy_driver); + +MODULE_DESCRIPTION("Broadcom STB SATA PHY driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Marc Carino"); +MODULE_AUTHOR("Brian Norris"); +MODULE_ALIAS("platform:phy-brcmstb-sata"); --=20 1.9.1