325 lines
8.6 KiB
C
325 lines
8.6 KiB
C
/*
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* Broadcom SATA3 AHCI Controller Driver
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*
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* Copyright © 2009-2015 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/ahci_platform.h>
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#include <linux/compiler.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/libata.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/string.h>
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#include "ahci.h"
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#define DRV_NAME "brcm-ahci"
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#define SATA_TOP_CTRL_VERSION 0x0
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#define SATA_TOP_CTRL_BUS_CTRL 0x4
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#define MMIO_ENDIAN_SHIFT 0 /* CPU->AHCI */
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#define DMADESC_ENDIAN_SHIFT 2 /* AHCI->DDR */
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#define DMADATA_ENDIAN_SHIFT 4 /* AHCI->DDR */
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#define PIODATA_ENDIAN_SHIFT 6
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#define ENDIAN_SWAP_NONE 0
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#define ENDIAN_SWAP_FULL 2
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#define OVERRIDE_HWINIT BIT(16)
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#define SATA_TOP_CTRL_TP_CTRL 0x8
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#define SATA_TOP_CTRL_PHY_CTRL 0xc
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#define SATA_TOP_CTRL_PHY_CTRL_1 0x0
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#define SATA_TOP_CTRL_1_PHY_DEFAULT_POWER_STATE BIT(14)
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#define SATA_TOP_CTRL_PHY_CTRL_2 0x4
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#define SATA_TOP_CTRL_2_SW_RST_MDIOREG BIT(0)
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#define SATA_TOP_CTRL_2_SW_RST_OOB BIT(1)
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#define SATA_TOP_CTRL_2_SW_RST_RX BIT(2)
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#define SATA_TOP_CTRL_2_SW_RST_TX BIT(3)
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#define SATA_TOP_CTRL_2_PHY_GLOBAL_RESET BIT(14)
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#define SATA_TOP_CTRL_PHY_OFFS 0x8
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#define SATA_TOP_MAX_PHYS 2
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#define SATA_TOP_CTRL_SATA_TP_OUT 0x1c
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#define SATA_TOP_CTRL_CLIENT_INIT_CTRL 0x20
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/* On big-endian MIPS, buses are reversed to big endian, so switch them back */
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#if defined(CONFIG_MIPS) && defined(__BIG_ENDIAN)
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#define DATA_ENDIAN 2 /* AHCI->DDR inbound accesses */
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#define MMIO_ENDIAN 2 /* CPU->AHCI outbound accesses */
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#else
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#define DATA_ENDIAN 0
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#define MMIO_ENDIAN 0
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#endif
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#define BUS_CTRL_ENDIAN_CONF \
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((DATA_ENDIAN << DMADATA_ENDIAN_SHIFT) | \
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(DATA_ENDIAN << DMADESC_ENDIAN_SHIFT) | \
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(MMIO_ENDIAN << MMIO_ENDIAN_SHIFT))
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struct brcm_ahci_priv {
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struct device *dev;
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void __iomem *top_ctrl;
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u32 port_mask;
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};
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static const struct ata_port_info ahci_brcm_port_info = {
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.flags = AHCI_FLAG_COMMON,
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.pio_mask = ATA_PIO4,
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.udma_mask = ATA_UDMA6,
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.port_ops = &ahci_platform_ops,
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};
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static inline u32 brcm_sata_readreg(void __iomem *addr)
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{
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/*
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* MIPS endianness is configured by boot strap, which also reverses all
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* bus endianness (i.e., big-endian CPU + big endian bus ==> native
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* endian I/O).
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*
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* Other architectures (e.g., ARM) either do not support big endian, or
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* else leave I/O in little endian mode.
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*/
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if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
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return __raw_readl(addr);
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else
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return readl_relaxed(addr);
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}
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static inline void brcm_sata_writereg(u32 val, void __iomem *addr)
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{
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/* See brcm_sata_readreg() comments */
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if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
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__raw_writel(val, addr);
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else
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writel_relaxed(val, addr);
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}
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static void brcm_sata_phy_enable(struct brcm_ahci_priv *priv, int port)
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{
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void __iomem *phyctrl = priv->top_ctrl + SATA_TOP_CTRL_PHY_CTRL +
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(port * SATA_TOP_CTRL_PHY_OFFS);
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void __iomem *p;
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u32 reg;
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/* clear PHY_DEFAULT_POWER_STATE */
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p = phyctrl + SATA_TOP_CTRL_PHY_CTRL_1;
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reg = brcm_sata_readreg(p);
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reg &= ~SATA_TOP_CTRL_1_PHY_DEFAULT_POWER_STATE;
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brcm_sata_writereg(reg, p);
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/* reset the PHY digital logic */
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p = phyctrl + SATA_TOP_CTRL_PHY_CTRL_2;
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reg = brcm_sata_readreg(p);
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reg &= ~(SATA_TOP_CTRL_2_SW_RST_MDIOREG | SATA_TOP_CTRL_2_SW_RST_OOB |
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SATA_TOP_CTRL_2_SW_RST_RX);
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reg |= SATA_TOP_CTRL_2_SW_RST_TX;
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brcm_sata_writereg(reg, p);
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reg = brcm_sata_readreg(p);
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reg |= SATA_TOP_CTRL_2_PHY_GLOBAL_RESET;
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brcm_sata_writereg(reg, p);
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reg = brcm_sata_readreg(p);
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reg &= ~SATA_TOP_CTRL_2_PHY_GLOBAL_RESET;
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brcm_sata_writereg(reg, p);
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(void)brcm_sata_readreg(p);
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}
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static void brcm_sata_phy_disable(struct brcm_ahci_priv *priv, int port)
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{
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void __iomem *phyctrl = priv->top_ctrl + SATA_TOP_CTRL_PHY_CTRL +
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(port * SATA_TOP_CTRL_PHY_OFFS);
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void __iomem *p;
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u32 reg;
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/* power-off the PHY digital logic */
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p = phyctrl + SATA_TOP_CTRL_PHY_CTRL_2;
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reg = brcm_sata_readreg(p);
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reg |= (SATA_TOP_CTRL_2_SW_RST_MDIOREG | SATA_TOP_CTRL_2_SW_RST_OOB |
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SATA_TOP_CTRL_2_SW_RST_RX | SATA_TOP_CTRL_2_SW_RST_TX |
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SATA_TOP_CTRL_2_PHY_GLOBAL_RESET);
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brcm_sata_writereg(reg, p);
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/* set PHY_DEFAULT_POWER_STATE */
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p = phyctrl + SATA_TOP_CTRL_PHY_CTRL_1;
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reg = brcm_sata_readreg(p);
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reg |= SATA_TOP_CTRL_1_PHY_DEFAULT_POWER_STATE;
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brcm_sata_writereg(reg, p);
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}
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static void brcm_sata_phys_enable(struct brcm_ahci_priv *priv)
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{
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int i;
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for (i = 0; i < SATA_TOP_MAX_PHYS; i++)
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if (priv->port_mask & BIT(i))
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brcm_sata_phy_enable(priv, i);
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}
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static void brcm_sata_phys_disable(struct brcm_ahci_priv *priv)
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{
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int i;
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for (i = 0; i < SATA_TOP_MAX_PHYS; i++)
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if (priv->port_mask & BIT(i))
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brcm_sata_phy_disable(priv, i);
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}
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static u32 brcm_ahci_get_portmask(struct platform_device *pdev,
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struct brcm_ahci_priv *priv)
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{
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void __iomem *ahci;
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struct resource *res;
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u32 impl;
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ahci");
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ahci = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(ahci))
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return 0;
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impl = readl(ahci + HOST_PORTS_IMPL);
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if (fls(impl) > SATA_TOP_MAX_PHYS)
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dev_warn(priv->dev, "warning: more ports than PHYs (%#x)\n",
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impl);
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else if (!impl)
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dev_info(priv->dev, "no ports found\n");
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devm_iounmap(&pdev->dev, ahci);
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devm_release_mem_region(&pdev->dev, res->start, resource_size(res));
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return impl;
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}
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static void brcm_sata_init(struct brcm_ahci_priv *priv)
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{
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/* Configure endianness */
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brcm_sata_writereg(BUS_CTRL_ENDIAN_CONF,
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priv->top_ctrl + SATA_TOP_CTRL_BUS_CTRL);
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}
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#ifdef CONFIG_PM_SLEEP
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static int brcm_ahci_suspend(struct device *dev)
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{
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struct ata_host *host = dev_get_drvdata(dev);
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struct ahci_host_priv *hpriv = host->private_data;
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struct brcm_ahci_priv *priv = hpriv->plat_data;
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int ret;
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ret = ahci_platform_suspend(dev);
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brcm_sata_phys_disable(priv);
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return ret;
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}
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static int brcm_ahci_resume(struct device *dev)
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{
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struct ata_host *host = dev_get_drvdata(dev);
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struct ahci_host_priv *hpriv = host->private_data;
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struct brcm_ahci_priv *priv = hpriv->plat_data;
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brcm_sata_init(priv);
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brcm_sata_phys_enable(priv);
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return ahci_platform_resume(dev);
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}
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#endif
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static struct scsi_host_template ahci_platform_sht = {
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AHCI_SHT(DRV_NAME),
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};
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static int brcm_ahci_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct brcm_ahci_priv *priv;
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struct ahci_host_priv *hpriv;
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struct resource *res;
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int ret;
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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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priv->dev = dev;
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "top-ctrl");
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priv->top_ctrl = devm_ioremap_resource(dev, res);
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if (IS_ERR(priv->top_ctrl))
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return PTR_ERR(priv->top_ctrl);
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brcm_sata_init(priv);
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priv->port_mask = brcm_ahci_get_portmask(pdev, priv);
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if (!priv->port_mask)
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return -ENODEV;
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brcm_sata_phys_enable(priv);
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hpriv = ahci_platform_get_resources(pdev);
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if (IS_ERR(hpriv))
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return PTR_ERR(hpriv);
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hpriv->plat_data = priv;
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ret = ahci_platform_enable_resources(hpriv);
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if (ret)
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return ret;
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ret = ahci_platform_init_host(pdev, hpriv, &ahci_brcm_port_info,
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&ahci_platform_sht);
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if (ret)
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return ret;
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dev_info(dev, "Broadcom AHCI SATA3 registered\n");
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return 0;
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}
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static int brcm_ahci_remove(struct platform_device *pdev)
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{
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struct ata_host *host = dev_get_drvdata(&pdev->dev);
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struct ahci_host_priv *hpriv = host->private_data;
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struct brcm_ahci_priv *priv = hpriv->plat_data;
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int ret;
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ret = ata_platform_remove_one(pdev);
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if (ret)
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return ret;
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brcm_sata_phys_disable(priv);
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return 0;
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}
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static const struct of_device_id ahci_of_match[] = {
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{.compatible = "brcm,bcm7445-ahci"},
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{},
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};
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MODULE_DEVICE_TABLE(of, ahci_of_match);
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static SIMPLE_DEV_PM_OPS(ahci_brcm_pm_ops, brcm_ahci_suspend, brcm_ahci_resume);
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static struct platform_driver brcm_ahci_driver = {
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.probe = brcm_ahci_probe,
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.remove = brcm_ahci_remove,
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.driver = {
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.name = DRV_NAME,
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.of_match_table = ahci_of_match,
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.pm = &ahci_brcm_pm_ops,
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},
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};
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module_platform_driver(brcm_ahci_driver);
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MODULE_DESCRIPTION("Broadcom SATA3 AHCI Controller Driver");
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MODULE_AUTHOR("Brian Norris");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:sata-brcmstb");
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