487 lines
13 KiB
C
487 lines
13 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 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_FIRST_PORT_CTRL 0x700
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#define SATA_NEXT_PORT_CTRL_OFFSET 0x80
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#define SATA_PORT_PCTRL6(reg_base) (reg_base + 0x18)
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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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#define BUS_CTRL_ENDIAN_NSP_CONF \
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(0x02 << DMADATA_ENDIAN_SHIFT | 0x02 << DMADESC_ENDIAN_SHIFT)
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#define BUS_CTRL_ENDIAN_CONF_MASK \
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(0x3 << MMIO_ENDIAN_SHIFT | 0x3 << DMADESC_ENDIAN_SHIFT | \
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0x3 << DMADATA_ENDIAN_SHIFT | 0x3 << PIODATA_ENDIAN_SHIFT)
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enum brcm_ahci_version {
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BRCM_SATA_BCM7425 = 1,
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BRCM_SATA_BCM7445,
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BRCM_SATA_NSP,
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};
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enum brcm_ahci_quirks {
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BRCM_AHCI_QUIRK_NO_NCQ = BIT(0),
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BRCM_AHCI_QUIRK_SKIP_PHY_ENABLE = BIT(1),
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};
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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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u32 quirks;
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enum brcm_ahci_version version;
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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_alpm_init(struct ahci_host_priv *hpriv)
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{
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struct brcm_ahci_priv *priv = hpriv->plat_data;
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u32 port_ctrl, host_caps;
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int i;
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/* Enable support for ALPM */
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host_caps = readl(hpriv->mmio + HOST_CAP);
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if (!(host_caps & HOST_CAP_ALPM))
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hpriv->flags |= AHCI_HFLAG_YES_ALPM;
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/*
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* Adjust timeout to allow PLL sufficient time to lock while waking
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* up from slumber mode.
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*/
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for (i = 0, port_ctrl = SATA_FIRST_PORT_CTRL;
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i < SATA_TOP_MAX_PHYS;
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i++, port_ctrl += SATA_NEXT_PORT_CTRL_OFFSET) {
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if (priv->port_mask & BIT(i))
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writel(0xff1003fc,
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hpriv->mmio + SATA_PORT_PCTRL6(port_ctrl));
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}
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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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if (priv->quirks & BRCM_AHCI_QUIRK_SKIP_PHY_ENABLE)
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return;
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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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if (priv->quirks & BRCM_AHCI_QUIRK_SKIP_PHY_ENABLE)
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return;
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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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void __iomem *ctrl = priv->top_ctrl + SATA_TOP_CTRL_BUS_CTRL;
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u32 data;
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/* Configure endianness */
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data = brcm_sata_readreg(ctrl);
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data &= ~BUS_CTRL_ENDIAN_CONF_MASK;
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if (priv->version == BRCM_SATA_NSP)
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data |= BUS_CTRL_ENDIAN_NSP_CONF;
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else
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data |= BUS_CTRL_ENDIAN_CONF;
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brcm_sata_writereg(data, ctrl);
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}
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static unsigned int brcm_ahci_read_id(struct ata_device *dev,
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struct ata_taskfile *tf, u16 *id)
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{
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struct ata_port *ap = dev->link->ap;
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struct ata_host *host = ap->host;
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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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void __iomem *mmio = hpriv->mmio;
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unsigned int err_mask;
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unsigned long flags;
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int i, rc;
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u32 ctl;
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/* Try to read the device ID and, if this fails, proceed with the
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* recovery sequence below
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*/
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err_mask = ata_do_dev_read_id(dev, tf, id);
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if (likely(!err_mask))
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return err_mask;
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/* Disable host interrupts */
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spin_lock_irqsave(&host->lock, flags);
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ctl = readl(mmio + HOST_CTL);
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ctl &= ~HOST_IRQ_EN;
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writel(ctl, mmio + HOST_CTL);
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readl(mmio + HOST_CTL); /* flush */
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spin_unlock_irqrestore(&host->lock, flags);
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/* Perform the SATA PHY reset sequence */
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brcm_sata_phy_disable(priv, ap->port_no);
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/* Bring the PHY back on */
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brcm_sata_phy_enable(priv, ap->port_no);
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/* Re-initialize and calibrate the PHY */
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for (i = 0; i < hpriv->nports; i++) {
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rc = phy_init(hpriv->phys[i]);
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if (rc)
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goto disable_phys;
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rc = phy_calibrate(hpriv->phys[i]);
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if (rc) {
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phy_exit(hpriv->phys[i]);
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goto disable_phys;
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}
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}
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/* Re-enable host interrupts */
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spin_lock_irqsave(&host->lock, flags);
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ctl = readl(mmio + HOST_CTL);
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ctl |= HOST_IRQ_EN;
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writel(ctl, mmio + HOST_CTL);
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readl(mmio + HOST_CTL); /* flush */
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spin_unlock_irqrestore(&host->lock, flags);
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return ata_do_dev_read_id(dev, tf, id);
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disable_phys:
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while (--i >= 0) {
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phy_power_off(hpriv->phys[i]);
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phy_exit(hpriv->phys[i]);
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}
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return AC_ERR_OTHER;
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}
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static void brcm_ahci_host_stop(struct ata_host *host)
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{
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struct ahci_host_priv *hpriv = host->private_data;
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ahci_platform_disable_resources(hpriv);
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}
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static struct ata_port_operations ahci_brcm_platform_ops = {
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.inherits = &ahci_ops,
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.host_stop = brcm_ahci_host_stop,
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.read_id = brcm_ahci_read_id,
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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 | ATA_FLAG_NO_DIPM,
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.link_flags = ATA_LFLAG_NO_DB_DELAY,
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.pio_mask = ATA_PIO4,
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.udma_mask = ATA_UDMA6,
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.port_ops = &ahci_brcm_platform_ops,
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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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brcm_sata_alpm_init(hpriv);
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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 const struct of_device_id ahci_of_match[] = {
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{.compatible = "brcm,bcm7425-ahci", .data = (void *)BRCM_SATA_BCM7425},
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{.compatible = "brcm,bcm7445-ahci", .data = (void *)BRCM_SATA_BCM7445},
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{.compatible = "brcm,bcm-nsp-ahci", .data = (void *)BRCM_SATA_NSP},
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{},
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};
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MODULE_DEVICE_TABLE(of, ahci_of_match);
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static int brcm_ahci_probe(struct platform_device *pdev)
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{
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const struct of_device_id *of_id;
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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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of_id = of_match_node(ahci_of_match, pdev->dev.of_node);
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if (!of_id)
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return -ENODEV;
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priv->version = (enum brcm_ahci_version)of_id->data;
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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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if ((priv->version == BRCM_SATA_BCM7425) ||
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(priv->version == BRCM_SATA_NSP)) {
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priv->quirks |= BRCM_AHCI_QUIRK_NO_NCQ;
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priv->quirks |= BRCM_AHCI_QUIRK_SKIP_PHY_ENABLE;
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}
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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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hpriv->flags = AHCI_HFLAG_WAKE_BEFORE_STOP;
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brcm_sata_alpm_init(hpriv);
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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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if (priv->quirks & BRCM_AHCI_QUIRK_NO_NCQ)
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hpriv->flags |= AHCI_HFLAG_NO_NCQ;
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hpriv->flags |= AHCI_HFLAG_NO_WRITE_TO_RO;
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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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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");
|