// SPDX-License-Identifier: GPL-2.0-or-later /* * Broadcom SATA3 AHCI Controller Driver * * Copyright © 2009-2015 Broadcom Corporation */ #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/reset.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 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_FIRST_PORT_CTRL 0x700 #define SATA_NEXT_PORT_CTRL_OFFSET 0x80 #define SATA_PORT_PCTRL6(reg_base) (reg_base + 0x18) /* 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)) #define BUS_CTRL_ENDIAN_NSP_CONF \ (0x02 << DMADATA_ENDIAN_SHIFT | 0x02 << DMADESC_ENDIAN_SHIFT) #define BUS_CTRL_ENDIAN_CONF_MASK \ (0x3 << MMIO_ENDIAN_SHIFT | 0x3 << DMADESC_ENDIAN_SHIFT | \ 0x3 << DMADATA_ENDIAN_SHIFT | 0x3 << PIODATA_ENDIAN_SHIFT) enum brcm_ahci_version { BRCM_SATA_BCM7425 = 1, BRCM_SATA_BCM7445, BRCM_SATA_NSP, BRCM_SATA_BCM7216, }; enum brcm_ahci_quirks { BRCM_AHCI_QUIRK_SKIP_PHY_ENABLE = BIT(0), }; struct brcm_ahci_priv { struct device *dev; void __iomem *top_ctrl; u32 port_mask; u32 quirks; enum brcm_ahci_version version; struct reset_control *rcdev_rescal; struct reset_control *rcdev_ahci; }; 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(CONFIG_CPU_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(CONFIG_CPU_BIG_ENDIAN)) __raw_writel(val, addr); else writel_relaxed(val, addr); } static void brcm_sata_alpm_init(struct ahci_host_priv *hpriv) { struct brcm_ahci_priv *priv = hpriv->plat_data; u32 port_ctrl, host_caps; int i; /* Enable support for ALPM */ host_caps = readl(hpriv->mmio + HOST_CAP); if (!(host_caps & HOST_CAP_ALPM)) hpriv->flags |= AHCI_HFLAG_YES_ALPM; /* * Adjust timeout to allow PLL sufficient time to lock while waking * up from slumber mode. */ for (i = 0, port_ctrl = SATA_FIRST_PORT_CTRL; i < SATA_TOP_MAX_PHYS; i++, port_ctrl += SATA_NEXT_PORT_CTRL_OFFSET) { if (priv->port_mask & BIT(i)) writel(0xff1003fc, hpriv->mmio + SATA_PORT_PCTRL6(port_ctrl)); } } 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; if (priv->quirks & BRCM_AHCI_QUIRK_SKIP_PHY_ENABLE) return; /* 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; if (priv->quirks & BRCM_AHCI_QUIRK_SKIP_PHY_ENABLE) return; /* 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 ahci_host_priv *hpriv, struct brcm_ahci_priv *priv) { u32 impl; impl = readl(hpriv->mmio + 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"); return impl; } static void brcm_sata_init(struct brcm_ahci_priv *priv) { void __iomem *ctrl = priv->top_ctrl + SATA_TOP_CTRL_BUS_CTRL; u32 data; /* Configure endianness */ data = brcm_sata_readreg(ctrl); data &= ~BUS_CTRL_ENDIAN_CONF_MASK; if (priv->version == BRCM_SATA_NSP) data |= BUS_CTRL_ENDIAN_NSP_CONF; else data |= BUS_CTRL_ENDIAN_CONF; brcm_sata_writereg(data, ctrl); } static unsigned int brcm_ahci_read_id(struct ata_device *dev, struct ata_taskfile *tf, __le16 *id) { struct ata_port *ap = dev->link->ap; struct ata_host *host = ap->host; struct ahci_host_priv *hpriv = host->private_data; struct brcm_ahci_priv *priv = hpriv->plat_data; void __iomem *mmio = hpriv->mmio; unsigned int err_mask; unsigned long flags; int i, rc; u32 ctl; /* Try to read the device ID and, if this fails, proceed with the * recovery sequence below */ err_mask = ata_do_dev_read_id(dev, tf, id); if (likely(!err_mask)) return err_mask; /* Disable host interrupts */ spin_lock_irqsave(&host->lock, flags); ctl = readl(mmio + HOST_CTL); ctl &= ~HOST_IRQ_EN; writel(ctl, mmio + HOST_CTL); readl(mmio + HOST_CTL); /* flush */ spin_unlock_irqrestore(&host->lock, flags); /* Perform the SATA PHY reset sequence */ brcm_sata_phy_disable(priv, ap->port_no); /* Reset the SATA clock */ ahci_platform_disable_clks(hpriv); msleep(10); ahci_platform_enable_clks(hpriv); msleep(10); /* Bring the PHY back on */ brcm_sata_phy_enable(priv, ap->port_no); /* Re-initialize and calibrate the PHY */ for (i = 0; i < hpriv->nports; i++) { rc = phy_init(hpriv->phys[i]); if (rc) goto disable_phys; rc = phy_calibrate(hpriv->phys[i]); if (rc) { phy_exit(hpriv->phys[i]); goto disable_phys; } } /* Re-enable host interrupts */ spin_lock_irqsave(&host->lock, flags); ctl = readl(mmio + HOST_CTL); ctl |= HOST_IRQ_EN; writel(ctl, mmio + HOST_CTL); readl(mmio + HOST_CTL); /* flush */ spin_unlock_irqrestore(&host->lock, flags); return ata_do_dev_read_id(dev, tf, id); disable_phys: while (--i >= 0) { phy_power_off(hpriv->phys[i]); phy_exit(hpriv->phys[i]); } return AC_ERR_OTHER; } static void brcm_ahci_host_stop(struct ata_host *host) { struct ahci_host_priv *hpriv = host->private_data; ahci_platform_disable_resources(hpriv); } static struct ata_port_operations ahci_brcm_platform_ops = { .inherits = &ahci_ops, .host_stop = brcm_ahci_host_stop, .read_id = brcm_ahci_read_id, }; static const struct ata_port_info ahci_brcm_port_info = { .flags = AHCI_FLAG_COMMON | ATA_FLAG_NO_DIPM, .link_flags = ATA_LFLAG_NO_DEBOUNCE_DELAY, .pio_mask = ATA_PIO4, .udma_mask = ATA_UDMA6, .port_ops = &ahci_brcm_platform_ops, }; 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; brcm_sata_phys_disable(priv); if (IS_ENABLED(CONFIG_PM_SLEEP)) ret = ahci_platform_suspend(dev); else ret = 0; reset_control_assert(priv->rcdev_ahci); reset_control_rearm(priv->rcdev_rescal); return ret; } static int __maybe_unused 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; int ret = 0; ret = reset_control_deassert(priv->rcdev_ahci); if (ret) return ret; ret = reset_control_reset(priv->rcdev_rescal); if (ret) return ret; /* Make sure clocks are turned on before re-configuration */ ret = ahci_platform_enable_clks(hpriv); if (ret) return ret; ret = ahci_platform_enable_regulators(hpriv); if (ret) goto out_disable_clks; brcm_sata_init(priv); brcm_sata_phys_enable(priv); brcm_sata_alpm_init(hpriv); /* Since we had to enable clocks earlier on, we cannot use * ahci_platform_resume() as-is since a second call to * ahci_platform_enable_resources() would bump up the resources * (regulators, clocks, PHYs) count artificially so we copy the part * after ahci_platform_enable_resources(). */ ret = ahci_platform_enable_phys(hpriv); if (ret) goto out_disable_phys; ret = ahci_platform_resume_host(dev); if (ret) goto out_disable_platform_phys; /* We resumed so update PM runtime state */ pm_runtime_disable(dev); pm_runtime_set_active(dev); pm_runtime_enable(dev); return 0; out_disable_platform_phys: ahci_platform_disable_phys(hpriv); out_disable_phys: brcm_sata_phys_disable(priv); ahci_platform_disable_regulators(hpriv); out_disable_clks: ahci_platform_disable_clks(hpriv); return ret; } static struct scsi_host_template ahci_platform_sht = { AHCI_SHT(DRV_NAME), }; static const struct of_device_id ahci_of_match[] = { {.compatible = "brcm,bcm7425-ahci", .data = (void *)BRCM_SATA_BCM7425}, {.compatible = "brcm,bcm7445-ahci", .data = (void *)BRCM_SATA_BCM7445}, {.compatible = "brcm,bcm63138-ahci", .data = (void *)BRCM_SATA_BCM7445}, {.compatible = "brcm,bcm-nsp-ahci", .data = (void *)BRCM_SATA_NSP}, {.compatible = "brcm,bcm7216-ahci", .data = (void *)BRCM_SATA_BCM7216}, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, ahci_of_match); static int brcm_ahci_probe(struct platform_device *pdev) { const struct of_device_id *of_id; 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; of_id = of_match_node(ahci_of_match, pdev->dev.of_node); if (!of_id) return -ENODEV; priv->version = (unsigned long)of_id->data; 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); if (priv->version == BRCM_SATA_BCM7216) { priv->rcdev_rescal = devm_reset_control_get_optional_shared( &pdev->dev, "rescal"); if (IS_ERR(priv->rcdev_rescal)) return PTR_ERR(priv->rcdev_rescal); } priv->rcdev_ahci = devm_reset_control_get_optional(&pdev->dev, "ahci"); if (IS_ERR(priv->rcdev_ahci)) return PTR_ERR(priv->rcdev_ahci); hpriv = ahci_platform_get_resources(pdev, 0); if (IS_ERR(hpriv)) return PTR_ERR(hpriv); hpriv->plat_data = priv; hpriv->flags = AHCI_HFLAG_WAKE_BEFORE_STOP | AHCI_HFLAG_NO_WRITE_TO_RO; switch (priv->version) { case BRCM_SATA_BCM7425: hpriv->flags |= AHCI_HFLAG_DELAY_ENGINE; fallthrough; case BRCM_SATA_NSP: hpriv->flags |= AHCI_HFLAG_NO_NCQ; priv->quirks |= BRCM_AHCI_QUIRK_SKIP_PHY_ENABLE; break; default: break; } ret = reset_control_reset(priv->rcdev_rescal); if (ret) return ret; ret = reset_control_deassert(priv->rcdev_ahci); if (ret) return ret; ret = ahci_platform_enable_clks(hpriv); if (ret) goto out_reset; ret = ahci_platform_enable_regulators(hpriv); if (ret) goto out_disable_clks; /* Must be first so as to configure endianness including that * of the standard AHCI register space. */ brcm_sata_init(priv); /* Initializes priv->port_mask which is used below */ priv->port_mask = brcm_ahci_get_portmask(hpriv, priv); if (!priv->port_mask) { ret = -ENODEV; goto out_disable_regulators; } /* Must be done before ahci_platform_enable_phys() */ brcm_sata_phys_enable(priv); brcm_sata_alpm_init(hpriv); ret = ahci_platform_enable_phys(hpriv); if (ret) goto out_disable_phys; ret = ahci_platform_init_host(pdev, hpriv, &ahci_brcm_port_info, &ahci_platform_sht); if (ret) goto out_disable_platform_phys; dev_info(dev, "Broadcom AHCI SATA3 registered\n"); return 0; out_disable_platform_phys: ahci_platform_disable_phys(hpriv); out_disable_phys: brcm_sata_phys_disable(priv); out_disable_regulators: ahci_platform_disable_regulators(hpriv); out_disable_clks: ahci_platform_disable_clks(hpriv); out_reset: reset_control_assert(priv->rcdev_ahci); reset_control_rearm(priv->rcdev_rescal); return ret; } 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; brcm_sata_phys_disable(priv); return ata_platform_remove_one(pdev); } static void brcm_ahci_shutdown(struct platform_device *pdev) { int ret; /* All resources releasing happens via devres, but our device, unlike a * proper remove is not disappearing, therefore using * brcm_ahci_suspend() here which does explicit power management is * appropriate. */ ret = brcm_ahci_suspend(&pdev->dev); if (ret) dev_err(&pdev->dev, "failed to shutdown\n"); } 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, .shutdown = brcm_ahci_shutdown, .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");