diff options
Diffstat (limited to 'drivers/ata/ahci_brcmstb.c')
| -rw-r--r-- | drivers/ata/ahci_brcmstb.c | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/drivers/ata/ahci_brcmstb.c b/drivers/ata/ahci_brcmstb.c new file mode 100644 index 000000000000..ce1e3a885981 --- /dev/null +++ b/drivers/ata/ahci_brcmstb.c @@ -0,0 +1,322 @@ +/* + * Broadcom SATA3 AHCI Controller Driver + * + * Copyright © 2009-2015 Broadcom Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * 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 <linux/ahci_platform.h> +#include <linux/compiler.h> +#include <linux/device.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/libata.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/string.h> + +#include "ahci.h" + +#define DRV_NAME "brcm-ahci" + +#define SATA_TOP_CTRL_VERSION 0x0 +#define SATA_TOP_CTRL_BUS_CTRL 0x4 + #define MMIO_ENDIAN_SHIFT 0 /* CPU->AHCI */ + #define DMADESC_ENDIAN_SHIFT 2 /* AHCI->DDR */ + #define DMADATA_ENDIAN_SHIFT 4 /* AHCI->DDR */ + #define PIODATA_ENDIAN_SHIFT 6 + #define ENDIAN_SWAP_NONE 0 + #define ENDIAN_SWAP_FULL 2 + #define OVERRIDE_HWINIT BIT(16) +#define SATA_TOP_CTRL_TP_CTRL 0x8 +#define SATA_TOP_CTRL_PHY_CTRL 0xc + #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 SATA_TOP_CTRL_PHY_OFFS 0x8 + #define SATA_TOP_MAX_PHYS 2 +#define SATA_TOP_CTRL_SATA_TP_OUT 0x1c +#define SATA_TOP_CTRL_CLIENT_INIT_CTRL 0x20 + +/* On big-endian MIPS, buses are reversed to big endian, so switch them back */ +#if defined(CONFIG_MIPS) && defined(__BIG_ENDIAN) +#define DATA_ENDIAN 2 /* AHCI->DDR inbound accesses */ +#define MMIO_ENDIAN 2 /* CPU->AHCI outbound accesses */ +#else +#define DATA_ENDIAN 0 +#define MMIO_ENDIAN 0 +#endif + +#define BUS_CTRL_ENDIAN_CONF \ + ((DATA_ENDIAN << DMADATA_ENDIAN_SHIFT) | \ + (DATA_ENDIAN << DMADESC_ENDIAN_SHIFT) | \ + (MMIO_ENDIAN << MMIO_ENDIAN_SHIFT)) + +struct brcm_ahci_priv { + struct device *dev; + void __iomem *top_ctrl; + u32 port_mask; +}; + +static const struct ata_port_info ahci_brcm_port_info = { + .flags = AHCI_FLAG_COMMON, + .pio_mask = ATA_PIO4, + .udma_mask = ATA_UDMA6, + .port_ops = &ahci_platform_ops, +}; + +static inline u32 brcm_sata_readreg(void __iomem *addr) +{ + /* + * MIPS endianness is configured by boot strap, which also reverses all + * bus endianness (i.e., big-endian CPU + big endian bus ==> native + * endian I/O). + * + * Other architectures (e.g., ARM) either do not support big endian, or + * else leave I/O in little endian mode. + */ + if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(__BIG_ENDIAN)) + return __raw_readl(addr); + else + return readl_relaxed(addr); +} + +static inline void brcm_sata_writereg(u32 val, void __iomem *addr) +{ + /* See brcm_sata_readreg() comments */ + if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(__BIG_ENDIAN)) + __raw_writel(val, addr); + else + writel_relaxed(val, addr); +} + +static void brcm_sata_phy_enable(struct brcm_ahci_priv *priv, int port) +{ + void __iomem *phyctrl = priv->top_ctrl + SATA_TOP_CTRL_PHY_CTRL + + (port * SATA_TOP_CTRL_PHY_OFFS); + void __iomem *p; + u32 reg; + + /* clear PHY_DEFAULT_POWER_STATE */ + p = phyctrl + SATA_TOP_CTRL_PHY_CTRL_1; + reg = brcm_sata_readreg(p); + reg &= ~SATA_TOP_CTRL_1_PHY_DEFAULT_POWER_STATE; + brcm_sata_writereg(reg, p); + + /* reset the PHY digital logic */ + p = phyctrl + SATA_TOP_CTRL_PHY_CTRL_2; + reg = brcm_sata_readreg(p); + reg &= ~(SATA_TOP_CTRL_2_SW_RST_MDIOREG | SATA_TOP_CTRL_2_SW_RST_OOB | + SATA_TOP_CTRL_2_SW_RST_RX); + reg |= SATA_TOP_CTRL_2_SW_RST_TX; + brcm_sata_writereg(reg, p); + reg = brcm_sata_readreg(p); + reg |= SATA_TOP_CTRL_2_PHY_GLOBAL_RESET; + brcm_sata_writereg(reg, p); + reg = brcm_sata_readreg(p); + reg &= ~SATA_TOP_CTRL_2_PHY_GLOBAL_RESET; + brcm_sata_writereg(reg, p); + (void)brcm_sata_readreg(p); +} + +static void brcm_sata_phy_disable(struct brcm_ahci_priv *priv, int port) +{ + void __iomem *phyctrl = priv->top_ctrl + SATA_TOP_CTRL_PHY_CTRL + + (port * SATA_TOP_CTRL_PHY_OFFS); + void __iomem *p; + u32 reg; + + /* power-off the PHY digital logic */ + p = phyctrl + SATA_TOP_CTRL_PHY_CTRL_2; + reg = brcm_sata_readreg(p); + reg |= (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); + brcm_sata_writereg(reg, p); + + /* set PHY_DEFAULT_POWER_STATE */ + p = phyctrl + SATA_TOP_CTRL_PHY_CTRL_1; + reg = brcm_sata_readreg(p); + reg |= SATA_TOP_CTRL_1_PHY_DEFAULT_POWER_STATE; + brcm_sata_writereg(reg, p); +} + +static void brcm_sata_phys_enable(struct brcm_ahci_priv *priv) +{ + int i; + + for (i = 0; i < SATA_TOP_MAX_PHYS; i++) + if (priv->port_mask & BIT(i)) + brcm_sata_phy_enable(priv, i); +} + +static void brcm_sata_phys_disable(struct brcm_ahci_priv *priv) +{ + int i; + + for (i = 0; i < SATA_TOP_MAX_PHYS; i++) + if (priv->port_mask & BIT(i)) + brcm_sata_phy_disable(priv, i); +} + +static u32 brcm_ahci_get_portmask(struct platform_device *pdev, + struct brcm_ahci_priv *priv) +{ + void __iomem *ahci; + struct resource *res; + u32 impl; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ahci"); + ahci = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(ahci)) + return 0; + + impl = readl(ahci + HOST_PORTS_IMPL); + + if (fls(impl) > SATA_TOP_MAX_PHYS) + dev_warn(priv->dev, "warning: more ports than PHYs (%#x)\n", + impl); + else if (!impl) + dev_info(priv->dev, "no ports found\n"); + + devm_iounmap(&pdev->dev, ahci); + devm_release_mem_region(&pdev->dev, res->start, resource_size(res)); + + return impl; +} + +static void brcm_sata_init(struct brcm_ahci_priv *priv) +{ + /* Configure endianness */ + brcm_sata_writereg(BUS_CTRL_ENDIAN_CONF, + priv->top_ctrl + SATA_TOP_CTRL_BUS_CTRL); +} + +static int brcm_ahci_suspend(struct device *dev) +{ + struct ata_host *host = dev_get_drvdata(dev); + struct ahci_host_priv *hpriv = host->private_data; + struct brcm_ahci_priv *priv = hpriv->plat_data; + int ret; + + ret = ahci_platform_suspend(dev); + brcm_sata_phys_disable(priv); + return ret; +} + +static int brcm_ahci_resume(struct device *dev) +{ + struct ata_host *host = dev_get_drvdata(dev); + struct ahci_host_priv *hpriv = host->private_data; + struct brcm_ahci_priv *priv = hpriv->plat_data; + + brcm_sata_init(priv); + brcm_sata_phys_enable(priv); + return ahci_platform_resume(dev); +} + +static struct scsi_host_template ahci_platform_sht = { + AHCI_SHT(DRV_NAME), +}; + +static int brcm_ahci_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct brcm_ahci_priv *priv; + struct ahci_host_priv *hpriv; + struct resource *res; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + priv->dev = dev; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "top-ctrl"); + priv->top_ctrl = devm_ioremap_resource(dev, res); + if (IS_ERR(priv->top_ctrl)) + return PTR_ERR(priv->top_ctrl); + + brcm_sata_init(priv); + + priv->port_mask = brcm_ahci_get_portmask(pdev, priv); + if (!priv->port_mask) + return -ENODEV; + + brcm_sata_phys_enable(priv); + + hpriv = ahci_platform_get_resources(pdev); + if (IS_ERR(hpriv)) + return PTR_ERR(hpriv); + hpriv->plat_data = priv; + + ret = ahci_platform_enable_resources(hpriv); + if (ret) + return ret; + + ret = ahci_platform_init_host(pdev, hpriv, &ahci_brcm_port_info, + &ahci_platform_sht); + if (ret) + return ret; + + dev_info(dev, "Broadcom AHCI SATA3 registered\n"); + + return 0; +} + +static int brcm_ahci_remove(struct platform_device *pdev) +{ + struct ata_host *host = dev_get_drvdata(&pdev->dev); + struct ahci_host_priv *hpriv = host->private_data; + struct brcm_ahci_priv *priv = hpriv->plat_data; + int ret; + + ret = ata_platform_remove_one(pdev); + if (ret) + return ret; + + brcm_sata_phys_disable(priv); + + return 0; +} + +static const struct of_device_id ahci_of_match[] = { + {.compatible = "brcm,bcm7445-ahci"}, + {}, +}; +MODULE_DEVICE_TABLE(of, ahci_of_match); + +static SIMPLE_DEV_PM_OPS(ahci_brcm_pm_ops, brcm_ahci_suspend, brcm_ahci_resume); + +static struct platform_driver brcm_ahci_driver = { + .probe = brcm_ahci_probe, + .remove = brcm_ahci_remove, + .driver = { + .name = DRV_NAME, + .of_match_table = ahci_of_match, + .pm = &ahci_brcm_pm_ops, + }, +}; +module_platform_driver(brcm_ahci_driver); + +MODULE_DESCRIPTION("Broadcom SATA3 AHCI Controller Driver"); +MODULE_AUTHOR("Brian Norris"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:sata-brcmstb"); |