ata: Add APM X-Gene SoC SATA host controller driver This patch adds support for the APM X-Gene SoC SATA host controller driver. It requires the corresponding APM X-Gene SoC SATA PHY driver. Signed-off-by: Loc Ho <lho@xxxxxxx> Signed-off-by: Tuan Phan <tphan@xxxxxxx> Signed-off-by: Suman Tripathi <stripathi@xxxxxxx> --- drivers/ata/Kconfig | 8 + drivers/ata/Makefile | 1 + drivers/ata/sata_xgene.c | 1128 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 1137 insertions(+), 0 deletions(-) create mode 100644 drivers/ata/sata_xgene.c diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig index 4e73772..318d113 100644 --- a/drivers/ata/Kconfig +++ b/drivers/ata/Kconfig @@ -106,6 +106,14 @@ config AHCI_IMX If unsure, say N. +config SATA_XGENE + tristate "APM X-Gene 6.0Gbps SATA host controller support" + depends on ARM64 || COMPILE_TEST + select SATA_AHCI_PLATFORM + select PHY_XGENE_SATA + help + This option enables support for APM X-Gene SoC SATA host controller. + config SATA_FSL tristate "Freescale 3.0Gbps SATA support" depends on FSL_SOC diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile index 46518c6..1c0fabe 100644 --- a/drivers/ata/Makefile +++ b/drivers/ata/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_SATA_SIL24) += sata_sil24.o obj-$(CONFIG_SATA_DWC) += sata_dwc_460ex.o obj-$(CONFIG_SATA_HIGHBANK) += sata_highbank.o libahci.o obj-$(CONFIG_AHCI_IMX) += ahci_imx.o +obj-$(CONFIG_SATA_XGENE) += sata_xgene.o # SFF w/ custom DMA obj-$(CONFIG_PDC_ADMA) += pdc_adma.o diff --git a/drivers/ata/sata_xgene.c b/drivers/ata/sata_xgene.c new file mode 100644 index 0000000..bb7221a --- /dev/null +++ b/drivers/ata/sata_xgene.c @@ -0,0 +1,1128 @@ +/* + * AppliedMicro X-Gene SoC SATA Host Controller Driver + * + * Copyright (c) 2013, Applied Micro Circuits Corporation + * Author: Loc Ho <lho@xxxxxxx> + * Tuan Phan <tphan@xxxxxxx> + * Suman Tripathi <stripathi@xxxxxxx> + * + * 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 of the License, 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. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + */ +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/acpi.h> +#include <linux/efi.h> +#include <linux/phy/phy.h> +#include "ahci.h" + +/* Max # of disk per a controller */ +#define MAX_AHCI_CHN_PERCTR 2 + +#define SATA_DIAG_OFFSET 0x0000D000 +#define SATA_GLB_OFFSET 0x0000D850 +#define SATA_SHIM_OFFSET 0x0000E000 +#define SATA_MASTER_OFFSET 0x0000F000 +#define SATA_PORT0_OFFSET 0x00000100 +#define SATA_PORT1_OFFSET 0x00000180 + +/* SATA host controller CSR */ +#define SLVRDERRATTRIBUTES_ADDR 0x00000000 +#define SLVWRERRATTRIBUTES_ADDR 0x00000004 +#define MSTRDERRATTRIBUTES_ADDR 0x00000008 +#define MSTWRERRATTRIBUTES_ADDR 0x0000000c +#define BUSCTLREG_ADDR 0x00000014 +#define MSTAWAUX_COHERENT_BYPASS_SET(dst, src) \ + (((dst) & ~0x00000002) | (((u32)(src)<<1) & 0x00000002)) +#define MSTARAUX_COHERENT_BYPASS_SET(dst, src) \ + (((dst) & ~0x00000001) | (((u32)(src)) & 0x00000001)) +#define IOFMSTRWAUX_ADDR 0x00000018 +#define INTSTATUSMASK_ADDR 0x0000002c +#define ERRINTSTATUS_ADDR 0x00000030 +#define ERRINTSTATUSMASK_ADDR 0x00000034 + +/* SATA host AHCI CSR */ +#define PORTCFG_ADDR 0x000000a4 +#define PORTADDR_SET(dst, src) \ + (((dst) & ~0x0000003f) | (((u32)(src)) & 0x0000003f)) +#define PORTPHY1CFG_ADDR 0x000000a8 +#define PORTPHY1CFG_FRCPHYRDY_SET(dst, src) \ + (((dst) & ~0x00100000) | (((u32)(src) << 0x14) & 0x00100000)) +#define PORTPHY2CFG_ADDR 0x000000ac +#define PORTPHY3CFG_ADDR 0x000000b0 +#define PORTPHY4CFG_ADDR 0x000000b4 +#define PORTPHY5CFG_ADDR 0x000000b8 +#define SCTL0_ADDR 0x0000012C +#define PORTPHY5CFG_RTCHG_SET(dst, src) \ + (((dst) & ~0xfff00000) | (((u32)(src) << 0x14) & 0xfff00000)) +#define PORTAXICFG_EN_CONTEXT_SET(dst, src) \ + (((dst) & ~0x01000000) | (((u32)(src) << 0x18) & 0x01000000)) +#define PORTAXICFG_ADDR 0x000000bc +#define PORTAXICFG_OUTTRANS_SET(dst, src) \ + (((dst) & ~0x00f00000) | (((u32)(src) << 0x14) & 0x00f00000)) + +/* SATA host controller slave CSR */ +#define INT_SLV_TMOMASK_ADDR 0x00000010 + +/* SATA global diagnostic CSR */ +#define REGSPEC_CFG_MEM_RAM_SHUTDOWN_ADDR 0x00000070 +#define REGSPEC_BLOCK_MEM_RDY_ADDR 0x00000074 + +/* AHBC IOB flush CSR */ +#define CFG_AMA_MODE_ADDR 0x0000e014 +#define CFG_RD2WR_EN 0x00000002 + +#define MAX_RETRY_COUNT 3 +#define SATA_RESET_MEM_RAM_TO 100000 + +struct xgene_ahci_context { + struct ahci_host_priv hpriv; + struct device *dev; + int irq; /* IRQ */ + void __iomem *csr_base; /* CSR base address of IP */ + u64 csr_phys; /* Physical address of CSR base address */ + void __iomem *mmio_base; /* AHCI I/O base address */ + u64 mmio_phys; /* Physical address of MMIO base address */ + void __iomem *ahbc_csr_base; /* Used for IOB flushing if non-zero */ + void __iomem *ahbc_io_base; /* Used for IOB flushing if non-zero */ + + struct phy *phy; +}; + +/* These wrapper existed for future expansion to support running on MSLIM + cores. */ +#define xgene_ahci_fill_cmd_slot ahci_fill_cmd_slot +#define xgene_ahci_exec_polled_cmd ahci_exec_polled_cmd +#define xgene_ahci_to_axi(x) (x) +#define xgene_ahci_dflush(x, ...) + +static void xgene_rd(void *addr, u32 *val) +{ + *val = readl(addr); + pr_debug("X-Gene SATA CSR RD: 0x%p value: 0x%08x\n", addr, *val); +} + +static void xgene_wr(void *addr, u32 val) +{ + writel(val, addr); + pr_debug("X-Gene SATA CSR WR: 0x%p value: 0x%08x\n", addr, val); +} + +static void xgene_wr_flush(void *addr, u32 val) +{ + writel(val, addr); + pr_debug("X-Gene SATA CSR WR: 0x%p value: 0x%08x\n", addr, val); + val = readl(addr); +} + +static int xgene_ahci_get_channel(struct ata_host *host, struct ata_port *port) +{ + int i; + for (i = 0; i < host->n_ports; i++) + if (host->ports[i] == port) + return i; + return -1; +} + +static int xgene_ahci_init_memram(struct xgene_ahci_context *ctx) +{ + void *diagcsr = ctx->csr_base + SATA_DIAG_OFFSET; + int timeout; + u32 val; + + xgene_rd(diagcsr + REGSPEC_CFG_MEM_RAM_SHUTDOWN_ADDR, &val); + if (val == 0) { + dev_dbg(ctx->dev, "memory already released from shutdown\n"); + return 0; + } + dev_dbg(ctx->dev, "Release memory from shutdown\n"); + /* SATA controller memory in shutdown. Remove from shutdown. */ + xgene_wr_flush(diagcsr + REGSPEC_CFG_MEM_RAM_SHUTDOWN_ADDR, 0x00); + timeout = SATA_RESET_MEM_RAM_TO; + do { + xgene_rd(diagcsr + REGSPEC_BLOCK_MEM_RDY_ADDR, &val); + if (val != 0xFFFFFFFF) + udelay(1); + } while (val != 0xFFFFFFFF && timeout-- > 0); + if (timeout <= 0) { + dev_err(ctx->dev, "failed to release memory from shutdown\n"); + return -ENODEV; + } + return 0; +} + +/* + * Custom Query ID command + * + * Due to HW errata, we must stop and re-start the port state machine after + * read ID command. + */ +static unsigned int xgene_ahci_read_id(struct ata_device *dev, + struct ata_taskfile *tf, u16 *id) +{ + u32 err_mask; + struct ata_port *ap = dev->link->ap; + void *port_mmio = ahci_port_base(ap); + u32 data32; + + err_mask = ata_do_dev_read_id(dev, tf, id); + if (err_mask) + return err_mask; + + /* Mask reserved area. Bit78 spec of Link Power Management + * bit15-8: reserved + * bit7: NCQ autosence + * bit6: Software settings preservation supported + * bit5: reserved + * bit4: In-order sata delivery supported + * bit3: DIPM requests supported + * bit2: DMA Setup FIS Auto-Activate optimization supported + * bit1: DMA Setup FIX non-Zero buffer offsets supported + * bit0: Reserved + * + * Clear reserved bit (DEVSLP bit) as we don't support DEVSLP + */ + id[78] &= 0x00FF; + + /* Restart the port if requred due to HW errata */ + data32 = readl(port_mmio + PORT_CMD_ISSUE); + if (data32 == 0x00000000) { + writel(PORT_CMD_FIS_RX, port_mmio + PORT_CMD); + readl(port_mmio + PORT_CMD); /* flush */ + writel(PORT_CMD_FIS_RX | PORT_CMD_START, port_mmio + PORT_CMD); + readl(port_mmio + PORT_CMD); /* flush */ + } + return 0; +} + +/* + * Custom QC issue + * + * Due to HW errata, we must stop and re-start the port state machine after + * read ID command. + */ +static unsigned int xgene_ahci_qc_issue(struct ata_queued_cmd *qc) +{ + struct ata_port *ap = qc->ap; + void __iomem *port_mmio = ahci_port_base(ap); + struct ahci_port_priv *pp = ap->private_data; + + /* Keep track of the currently active link. It will be used + * in completion path to determine whether NCQ phase is in + * progress. + */ + pp->active_link = qc->dev->link; + + if (qc->tf.protocol == ATA_PROT_NCQ) + writel(1 << qc->tag, port_mmio + PORT_SCR_ACT); + + if (pp->fbs_enabled && pp->fbs_last_dev != qc->dev->link->pmp) { + u32 fbs = readl(port_mmio + PORT_FBS); + fbs &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC); + fbs |= qc->dev->link->pmp << PORT_FBS_DEV_OFFSET; + writel(fbs, port_mmio + PORT_FBS); + pp->fbs_last_dev = qc->dev->link->pmp; + } + + writel(1 << qc->tag, port_mmio + PORT_CMD_ISSUE); + + ahci_sw_activity(qc->dev->link); + + /* For query ID command, restart the port if requred due to HW errata. + This is needed when PMP is attached. */ + if (qc->dev->link->pmp && qc->tf.command == ATA_CMD_ID_ATA && + readl(port_mmio + PORT_CMD_ISSUE) == 0x0) { + writel(PORT_CMD_FIS_RX, port_mmio + PORT_CMD); + readl(port_mmio + PORT_CMD); /* flush */ + writel(PORT_CMD_FIS_RX | PORT_CMD_START, port_mmio + PORT_CMD); + readl(port_mmio + PORT_CMD); /* flush */ + } + + return 0; +} + +static void xgene_ahci_enable_phy(struct xgene_ahci_context *ctx, + int channel, int enable) +{ + void *mmio = ctx->mmio_base; + u32 val; + + xgene_rd(mmio + PORTCFG_ADDR, &val); + val = PORTADDR_SET(val, channel == 0 ? 2 : 3); + xgene_wr_flush(mmio + PORTCFG_ADDR, val); + xgene_rd(mmio + PORTPHY1CFG_ADDR, &val); + val = PORTPHY1CFG_FRCPHYRDY_SET(val, enable); + xgene_wr(mmio + PORTPHY1CFG_ADDR, val); +} + +static void xgene_ahci_set_phy_cfg(struct xgene_ahci_context *ctx, int channel) +{ + void *mmio = ctx->mmio_base; + u32 val; + + dev_dbg(ctx->dev, "port configure mmio 0x%p channel %d\n", + mmio, channel); + xgene_rd(mmio + PORTCFG_ADDR, &val); + val = PORTADDR_SET(val, channel == 0 ? 2 : 3); + xgene_wr_flush(mmio + PORTCFG_ADDR, val); + /* Disable fix rate */ + xgene_wr_flush(mmio + PORTPHY1CFG_ADDR, 0x0001fffe); + xgene_wr_flush(mmio + PORTPHY2CFG_ADDR, 0x5018461c); + xgene_wr_flush(mmio + PORTPHY3CFG_ADDR, 0x1c081907); + xgene_wr_flush(mmio + PORTPHY4CFG_ADDR, 0x1c080815); + xgene_rd(mmio + PORTPHY5CFG_ADDR, &val); + /* Window negotiation 0x800 to 0x400 */ + val = PORTPHY5CFG_RTCHG_SET(val, 0x300); + xgene_wr_flush(mmio + PORTPHY5CFG_ADDR, val); + xgene_rd(mmio + PORTAXICFG_ADDR, &val); + val = PORTAXICFG_EN_CONTEXT_SET(val, 0x1); /* enable context mgmt */ + val = PORTAXICFG_OUTTRANS_SET(val, 0xe); /* Outstanding */ + xgene_wr_flush(mmio + PORTAXICFG_ADDR, val); +} + +/* Restart the PHY */ +static int xgene_ahci_phy_restart(struct ata_link *link) +{ + struct ata_port *port = link->ap; + struct ata_host *host = port->host; + struct xgene_ahci_context *ctx = host->private_data; + int channel; + + channel = xgene_ahci_get_channel(host, port); + if (channel < 0 || channel >= MAX_AHCI_CHN_PERCTR) + return -EINVAL; + xgene_ahci_enable_phy(ctx, channel, 1); + xgene_ahci_enable_phy(ctx, channel, 0); + return 0; +} + +static int xgene_ahci_do_hardreset(struct ata_link *link, int chan, + unsigned long deadline, bool *online) +{ + const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context); + struct ata_port *ap = link->ap; + struct xgene_ahci_context *ctx = ap->host->private_data; + struct ahci_port_priv *pp = ap->private_data; + u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG; + void __iomem *port_mmio = ahci_port_base(ap); + struct ata_taskfile tf; + int link_retry = 0; + int retry = 0; + int rc; + u32 val; + +hardreset_retry: + /* clear D2H reception area to properly wait for D2H FIS */ + ata_tf_init(link->device, &tf); + tf.command = 0x80; + ata_tf_to_fis(&tf, 0, 0, d2h_fis); + rc = sata_link_hardreset(link, timing, deadline, online, + ahci_check_ready); + /* clear all errors */ + xgene_rd(port_mmio + PORT_SCR_ERR, &val); + xgene_wr(port_mmio + PORT_SCR_ERR, val); + + /* Check to ensure that the disk comes up in match speed */ + if (*online) { + u32 sstatus; + sata_scr_read(link, SCR_STATUS, &sstatus); + if (!retry) { + if (((sstatus >> 4) & 0xf) == 2) { + /* For Gen2 and first time, let's check again + * with Gen2 serdes to ensure actual Gen2 disk. + */ + phy_set_speed(ctx->phy, chan, 3000000000); + xgene_ahci_phy_restart(link); + ++retry; + goto hardreset_retry; + } else if (((sstatus >> 4) & 0xf) == 1) { + /* For Gen1 and first time, let's check again + * with Gen1 serdes to ensure actual Gen1 disk. + */ + phy_set_speed(ctx->phy, chan, 1500000000); + xgene_ahci_phy_restart(link); + ++retry; + goto hardreset_retry; + } + } + } else if (link_retry < 4) { + link_retry++; + goto hardreset_retry; + } + ata_link_dbg(link, "channel %d post-hardrest PORT_CMD 0x%08X\n", + chan, readl(port_mmio + PORT_CMD)); + + return rc; +} + +static int xgene_ahci_hardreset(struct ata_link *link, unsigned int *class, + unsigned long deadline) +{ + struct ata_port *ap = link->ap; + void __iomem *port_mmio = ahci_port_base(ap); + bool online; + int chan; + int rc; + int portcmd_saved; + u32 portclb_saved; + u32 portclbhi_saved; + u32 portrxfis_saved; + u32 portrxfishi_saved; + + chan = xgene_ahci_get_channel(ap->host, ap); + if (chan >= MAX_AHCI_CHN_PERCTR) { + *class = ATA_DEV_NONE; + return 0; + } + ata_link_dbg(link, "channel %d APM hardreset\n", chan); + + /* As hardreset reset these CSR, let save it to restore later */ + portcmd_saved = readl(port_mmio + PORT_CMD); + portclb_saved = readl(port_mmio + PORT_LST_ADDR); + portclbhi_saved = readl(port_mmio + PORT_LST_ADDR_HI); + portrxfis_saved = readl(port_mmio + PORT_FIS_ADDR); + portrxfishi_saved = readl(port_mmio + PORT_FIS_ADDR_HI); + + ahci_stop_engine(ap); + + rc = xgene_ahci_do_hardreset(link, chan, deadline, &online); + + /* As controller hardreset clear them, let restore them */ + writel(portcmd_saved, port_mmio + PORT_CMD); + writel(portclb_saved, port_mmio + PORT_LST_ADDR); + writel(portclbhi_saved, port_mmio + PORT_LST_ADDR_HI); + writel(portrxfis_saved, port_mmio + PORT_FIS_ADDR); + writel(portrxfishi_saved, port_mmio + PORT_FIS_ADDR_HI); + + ahci_start_engine(ap); + + if (online) + *class = ahci_dev_classify(ap); + + ata_link_dbg(link, "channel %d APM hardreset EXIT class %u\n", + chan, *class); + return rc; +} + +/* Flush the IOB to ensure all SATA controller writes completed before + servicing the completed command. This is needed due to the possibility + that interrupt serviced before the data actually written to the cache/DDR. + Writes from the IP to the CPU domain is not synchronized with the IRQ + line or the IP core toggled the CI bits before the data write completed. */ +static int xgene_ahci_iob_flush(struct xgene_ahci_context *ctx) +{ + if (ctx->ahbc_io_base) + readl(ctx->ahbc_io_base); + return 0; +} + +static unsigned int xgene_ahci_fill_sg(struct ata_queued_cmd *qc, + void *cmd_tbl) +{ + struct scatterlist *sg; + struct ahci_sg *ahci_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ; + unsigned int si; + + /* + * Next, the S/G list. + */ + for_each_sg(qc->sg, sg, qc->n_elem, si) { + dma_addr_t addr = sg_dma_address(sg); + u64 dma_addr = xgene_ahci_to_axi(addr); + u32 sg_len = sg_dma_len(sg); + ahci_sg[si].addr = cpu_to_le32(dma_addr & 0xffffffff); + ahci_sg[si].addr_hi = cpu_to_le32((dma_addr >> 16) >> 16); + ahci_sg[si].flags_size = cpu_to_le32(sg_len - 1); + xgene_ahci_dflush((void *) __va(addr), sg_len); + } + return si; +} + +static void xgene_ahci_qc_prep(struct ata_queued_cmd *qc) +{ + struct ata_port *ap = qc->ap; + struct ahci_port_priv *pp = ap->private_data; + int is_atapi = ata_is_atapi(qc->tf.protocol); + void *cmd_tbl; + u32 opts; + const u32 cmd_fis_len = 5; /* five dwords */ + unsigned int n_elem; + void *port_mmio = ahci_port_base(ap); + u32 fbs; + + /* + * Fill in command table information. First, the header, + * a SATA Register - Host to Device command FIS. + */ + cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ; + + /* Due to hardware errata for port multipier CBS mode, enable DEV + field of PxFBS in order to clear the PxCI */ + fbs = readl(port_mmio + 0x40); + if (qc->dev->link->pmp || ((fbs >> 8) & 0x0000000f)) { + fbs &= 0xfffff0ff; + fbs |= qc->dev->link->pmp << 8; + writel(fbs, port_mmio + 0x40); + } + + ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl); + if (is_atapi) { + memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32); + memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len); + } + n_elem = 0; + if (qc->flags & ATA_QCFLAG_DMAMAP) + n_elem = xgene_ahci_fill_sg(qc, cmd_tbl); + + /* + * Fill in command slot information. + */ + opts = cmd_fis_len | n_elem << 16 | (qc->dev->link->pmp << 12); + if (qc->tf.flags & ATA_TFLAG_WRITE) + opts |= AHCI_CMD_WRITE; + if (is_atapi) + opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH; + + xgene_ahci_fill_cmd_slot(pp, qc->tag, opts); +} + +/* Due to HW BUG we are limited to single FIS receive area for FBS so + * limiting the FBS FIS area from 16 to 0. + */ +static bool xgene_ahci_qc_fill_rtf(struct ata_queued_cmd *qc) +{ + struct ahci_port_priv *pp = qc->ap->private_data; + u8 *rx_fis = pp->rx_fis; + + /* + * After a successful execution of an ATA PIO data-in command, + * the device doesn't send D2H Reg FIS to update the TF and + * the host should take TF and E_Status from the preceding PIO + * Setup FIS. + */ + if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE && + !(qc->flags & ATA_QCFLAG_FAILED)) { + ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf); + qc->result_tf.command = (rx_fis + RX_FIS_PIO_SETUP)[15]; + } else + ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf); + + return true; +} + +static int xgene_ahci_do_softreset(struct ata_link *link, + unsigned int *class, int pmp, + unsigned long deadline, + int (*check_ready) (struct ata_link *link)) +{ + struct ata_port *ap = link->ap; + struct ahci_host_priv *hpriv = ap->host->private_data; + const char *reason = NULL; + unsigned long now, msecs; + struct ata_taskfile tf; + int rc; + + ata_link_dbg(link, "ENTER\n"); + + /* prepare for SRST (AHCI-1.1 10.4.1) */ + rc = ahci_kick_engine(ap); + if (rc && rc != -EOPNOTSUPP) + ata_link_warn(link, "failed to reset engine (errno=%d)\n", rc); + + ata_tf_init(link->device, &tf); + /* issue the first D2H Register FIS */ + msecs = 0; + now = jiffies; + if (time_after(deadline, now)) + msecs = jiffies_to_msecs(deadline - now); + + tf.ctl |= ATA_SRST; + /* Must call X-Gene version in case it needs to flush the cache for + MSLIM as well as AXI address translation */ + if (xgene_ahci_exec_polled_cmd(ap, pmp, &tf, 0, + AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY, + msecs)) { + rc = -EIO; + reason = "1st FIS failed"; + goto fail; + } + + /* spec says at least 5us, but be generous and sleep for 1ms */ + ata_msleep(ap, 1); + + /* issue the second D2H Register FIS */ + tf.ctl &= ~ATA_SRST; + /* HW need AHCI_CMD_RESET and AHCI_CMD_CLR_BUSY */ + xgene_ahci_exec_polled_cmd(ap, pmp, &tf, 0, + AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY, msecs); + /* wait for link to become ready */ + rc = ata_wait_after_reset(link, deadline, check_ready); + if (rc == -EBUSY && hpriv->flags & AHCI_HFLAG_SRST_TOUT_IS_OFFLINE) { + /* + * Workaround for cases where link online status can't + * be trusted. Treat device readiness timeout as link + * offline. + */ + ata_link_info(link, "device not ready, treating as offline\n"); + *class = ATA_DEV_NONE; + } else if (rc) { + /* link occupied, -ENODEV too is an error */ + reason = "device not ready"; + goto fail; + } else { + *class = ahci_dev_classify(ap); + } + + ata_link_dbg(link, "EXIT, class=%u\n", *class); + return 0; + +fail: + ata_link_err(link, "softreset failed (%s)\n", reason); + return rc; +} + +static int xgene_ahci_softreset(struct ata_link *link, unsigned int *class, + unsigned long deadline) +{ + int pmp = sata_srst_pmp(link); + return xgene_ahci_do_softreset(link, class, pmp, deadline, + ahci_check_ready); +} + +static struct ata_port_operations xgene_ahci_ops = { + .inherits = &ahci_ops, + .hardreset = xgene_ahci_hardreset, + .read_id = xgene_ahci_read_id, + .qc_prep = xgene_ahci_qc_prep, + .qc_issue = xgene_ahci_qc_issue, + .softreset = xgene_ahci_softreset, + .pmp_softreset = xgene_ahci_softreset, + .qc_fill_rtf = xgene_ahci_qc_fill_rtf, +}; + +static const struct ata_port_info xgene_ahci_port_info[] = { + { + .flags = AHCI_FLAG_COMMON, + .pio_mask = ATA_PIO4, + .udma_mask = ATA_UDMA6, + .port_ops = &xgene_ahci_ops, + }, +}; + +static struct scsi_host_template xgene_ahci_sht = { + AHCI_SHT("XGene-ahci"), +}; + +static void xgene_ahci_port_intr(struct ata_port *ap) +{ + void __iomem *port_mmio = ahci_port_base(ap); + struct ata_eh_info *ehi = &ap->link.eh_info; + struct ahci_port_priv *pp = ap->private_data; + struct ahci_host_priv *hpriv = ap->host->private_data; + int resetting = !!(ap->pflags & ATA_PFLAG_RESETTING); + u32 status, qc_active = 0; + int rc; + + status = readl(port_mmio + PORT_IRQ_STAT); + writel(status, port_mmio + PORT_IRQ_STAT); + + /* ignore BAD_PMP while resetting */ + if (unlikely(resetting)) + status &= ~PORT_IRQ_BAD_PMP; + + /* if LPM is enabled, PHYRDY doesn't mean anything */ + if (ap->link.lpm_policy > ATA_LPM_MAX_POWER) { + status &= ~PORT_IRQ_PHYRDY; + ahci_scr_write(&ap->link, SCR_ERROR, SERR_PHYRDY_CHG); + } + + if (unlikely(status & PORT_IRQ_ERROR)) { + ahci_error_intr(ap, status); + return; + } + + if (status & PORT_IRQ_SDB_FIS) { + /* If SNotification is available, leave notification + * handling to sata_async_notification(). If not, + * emulate it by snooping SDB FIS RX area. + * + * Snooping FIS RX area is probably cheaper than + * poking SNotification but some constrollers which + * implement SNotification, ICH9 for example, don't + * store AN SDB FIS into receive area. + */ + if (hpriv->cap & HOST_CAP_SNTF) + sata_async_notification(ap); + else { + /* If the 'N' bit in word 0 of the FIS is set, + * we just received asynchronous notification. + * Tell libata about it. + * + * Lack of SNotification should not appear in + * ahci 1.2, so the workaround is unnecessary + * when FBS is enabled. + */ + if (pp->fbs_enabled) + WARN_ON_ONCE(1); + else { + const __le32 *f = pp->rx_fis + RX_FIS_SDB; + u32 f0 = le32_to_cpu(f[0]); + if (f0 & (1 << 15)) + sata_async_notification(ap); + } + } + } + + /* pp->active_link is not reliable once FBS is enabled, both + * PORT_SCR_ACT and PORT_CMD_ISSUE should be checked because + * NCQ and non-NCQ commands may be in flight at the same time. + */ + if (pp->fbs_enabled) { + if (ap->qc_active) { + qc_active = readl(port_mmio + PORT_SCR_ACT); + qc_active |= readl(port_mmio + PORT_CMD_ISSUE); + } + } else { + /* pp->active_link is valid iff any command is in flight */ + if (ap->qc_active && pp->active_link->sactive) + qc_active = readl(port_mmio + PORT_SCR_ACT); + else + qc_active = readl(port_mmio + PORT_CMD_ISSUE); + } + + /* Flush the IOB before servicing interrupt to ensure all data + written by the controller appears in DDR */ + xgene_ahci_iob_flush((struct xgene_ahci_context *) hpriv); + + rc = ata_qc_complete_multiple(ap, qc_active); + + /* while resetting, invalid completions are expected */ + if (unlikely(rc < 0 && !resetting)) { + ehi->err_mask |= AC_ERR_HSM; + ehi->action |= ATA_EH_RESET; + ata_port_freeze(ap); + } +} + +static irqreturn_t xgene_ahci_interrupt(int irq, void *dev_instance) +{ + struct ata_host *host = dev_instance; + struct ahci_host_priv *hpriv; + unsigned int i, handled = 0; + void __iomem *mmio; + u32 irq_stat, irq_masked; + + VPRINTK("ENTER\n"); + + hpriv = host->private_data; + mmio = hpriv->mmio; + + /* sigh. 0xffffffff is a valid return from h/w */ + irq_stat = readl(mmio + HOST_IRQ_STAT); + if (!irq_stat) + return IRQ_NONE; + + irq_masked = irq_stat & hpriv->port_map; + + spin_lock(&host->lock); + + for (i = 0; i < host->n_ports; i++) { + struct ata_port *ap; + + if (!(irq_masked & (1 << i))) + continue; + + ap = host->ports[i]; + if (ap) { + xgene_ahci_port_intr(ap); + VPRINTK("port %u\n", i); + } else { + VPRINTK("port %u (no irq)\n", i); + if (ata_ratelimit()) + dev_warn(host->dev, + "interrupt on disabled port %u\n", i); + } + + handled = 1; + } + + /* HOST_IRQ_STAT behaves as level triggered latch meaning that + * it should be cleared after all the port events are cleared; + * otherwise, it will raise a spurious interrupt after each + * valid one. Please read section 10.6.2 of ahci 1.1 for more + * information. + * + * Also, use the unmasked value to clear interrupt as spurious + * pending event on a dummy port might cause screaming IRQ. + */ + writel(irq_stat, mmio + HOST_IRQ_STAT); + + spin_unlock(&host->lock); + + VPRINTK("EXIT\n"); + + return IRQ_RETVAL(handled); +} + +static int xgene_ahci_hw_init(struct xgene_ahci_context *hpriv) +{ + int i; + int rc; + u32 val; + + /* Remove IP RAM out of shutdown */ + rc = xgene_ahci_init_memram(hpriv); + if (rc) + return rc; + + for (i = 0; i < MAX_AHCI_CHN_PERCTR; i++) + xgene_ahci_set_phy_cfg(hpriv, i); + + /* Now enable top level interrupt. Otherwise, port interrupt will + not work. */ + /* AXI disable Mask */ + xgene_wr_flush(hpriv->mmio_base + HOST_IRQ_STAT, 0xffffffff); + xgene_wr(hpriv->csr_base + INTSTATUSMASK_ADDR, 0); + xgene_rd(hpriv->csr_base + INTSTATUSMASK_ADDR, &val); + dev_dbg(hpriv->dev, "top level interrupt mask 0x%X value 0x%08X\n", + INTSTATUSMASK_ADDR, val); + xgene_wr_flush(hpriv->csr_base + ERRINTSTATUSMASK_ADDR, 0x0); + xgene_wr_flush(hpriv->csr_base + SATA_SHIM_OFFSET + + INT_SLV_TMOMASK_ADDR, 0x0); + /* Enable AXI Interrupt */ + xgene_wr(hpriv->csr_base + SLVRDERRATTRIBUTES_ADDR, 0xffffffff); + xgene_wr(hpriv->csr_base + SLVWRERRATTRIBUTES_ADDR, 0xffffffff); + xgene_wr(hpriv->csr_base + MSTRDERRATTRIBUTES_ADDR, 0xffffffff); + xgene_wr(hpriv->csr_base + MSTWRERRATTRIBUTES_ADDR, 0xffffffff); + + /* Enable coherency unless explicit disabled */ + xgene_rd(hpriv->csr_base + BUSCTLREG_ADDR, &val); + val = MSTAWAUX_COHERENT_BYPASS_SET(val, 0); + val = MSTARAUX_COHERENT_BYPASS_SET(val, 0); + xgene_wr(hpriv->csr_base + BUSCTLREG_ADDR, val); + + xgene_rd(hpriv->csr_base + IOFMSTRWAUX_ADDR, &val); + val |= (1 << 3); /* Enable read coherency */ + val |= (1 << 9); /* Enable write coherency */ + xgene_wr_flush(hpriv->csr_base + IOFMSTRWAUX_ADDR, val); + xgene_rd(hpriv->csr_base + IOFMSTRWAUX_ADDR, &val); + dev_dbg(hpriv->dev, "coherency 0x%X value 0x%08X\n", + IOFMSTRWAUX_ADDR, val); + + if (hpriv->ahbc_csr_base) { + /* Enable IOB flush feature */ + val = readl(hpriv->ahbc_csr_base + CFG_AMA_MODE_ADDR); + val |= CFG_RD2WR_EN; + writel(val, hpriv->ahbc_csr_base + CFG_AMA_MODE_ADDR); + dev_dbg(hpriv->dev, "enable IOB flush\n"); + } + return rc; +} + +static int xgene_ahci_probe(struct platform_device *pdev) +{ + struct xgene_ahci_context *hpriv; + struct ata_port_info pi = xgene_ahci_port_info[0]; + const struct ata_port_info *ppi[] = { &pi, NULL }; + struct ata_host *host; + struct resource *res; + char res_name[30]; + int n_ports; + int rc = 0; + int i; + + /* When both ACPi and DTS are enabled, custom ACPI built-in ACPI + table, and booting via DTS, we need to skip the probe of the + built-in ACPI table probe. */ + if (!efi_enabled(EFI_BOOT) && pdev->dev.of_node == NULL) + return -ENODEV; + + /* Check if the entry is disabled for OF only */ + if (!efi_enabled(EFI_BOOT) && + !of_device_is_available(pdev->dev.of_node)) + return -ENODEV; +#if defined(CONFIG_ACPI) + if (efi_enabled(EFI_BOOT)) { + struct acpi_device *device; + + if (acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &device)) + return -ENODEV; + + if (acpi_bus_get_status(device) || !device->status.present) + return -ENODEV; + } +#endif + + hpriv = devm_kzalloc(&pdev->dev, sizeof(*hpriv), GFP_KERNEL); + if (!hpriv) { + dev_err(&pdev->dev, "can't allocate host context\n"); + return -ENOMEM; + } + hpriv->dev = &pdev->dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "no AHCI MMIO resource address\n"); + goto error; + } + hpriv->mmio_phys = res->start; + hpriv->mmio_base = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!hpriv->mmio_base) { + dev_err(&pdev->dev, "can't map AHCI MMIO resource\n"); + rc = -ENOMEM; + goto error; + } + hpriv->hpriv.mmio = hpriv->mmio_base; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (!res) { + dev_err(&pdev->dev, "no host resource address\n"); + goto error; + } + hpriv->csr_phys = res->start; + hpriv->csr_base = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!hpriv->csr_base) { + dev_err(&pdev->dev, "can't map host resource\n"); + rc = -ENOMEM; + goto error; + } + + /* Both the IOB CSR and IOB IO flush registers must be available + in order to enable the IOB flush feature. */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 2); + if (res) { + hpriv->ahbc_csr_base = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!hpriv->ahbc_csr_base) { + dev_err(&pdev->dev, + "can't map IOB CSR flush resource\n"); + rc = -ENOMEM; + goto error; + } + res = platform_get_resource(pdev, IORESOURCE_MEM, 3); + if (!res) { + dev_err(&pdev->dev, "no IOB IO CSR resource\n"); + rc = -ENOMEM; + goto error; + } + hpriv->ahbc_io_base = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!hpriv->ahbc_io_base) { + dev_err(&pdev->dev, "can't map IOB IO CSR resource\n"); + rc = -ENOMEM; + goto error; + } + } + + dev_dbg(&pdev->dev, + "PHY PAddr 0x%016LX VAddr 0x%p Mmio PAddr 0x%016LX VAddr 0x%p\n", + hpriv->csr_phys, hpriv->csr_base, hpriv->mmio_phys, + hpriv->mmio_base); + + hpriv->irq = platform_get_irq(pdev, 0); + if (hpriv->irq <= 0) { + dev_err(&pdev->dev, "no IRQ resource\n"); + rc = -ENODEV; + goto error; + } + + /* Configure the PHY */ + sprintf(res_name, "sataphy%08x", (u32) hpriv->csr_phys); + hpriv->phy = devm_phy_get(&pdev->dev, res_name); + if (!hpriv->phy) { + dev_err(&pdev->dev, "no PHY available\n"); + goto error; + } + + rc = phy_init(hpriv->phy); + if (rc) { + dev_err(&pdev->dev, "PHY initialize failed %d\n", rc); + goto error; + } + + /* Configure the host controller */ + xgene_ahci_hw_init(hpriv); + + /* Setup AHCI host priv structure */ + ahci_save_initial_config(&pdev->dev, &hpriv->hpriv, 0, 0); + + /* prepare host */ + if (hpriv->hpriv.cap & HOST_CAP_NCQ) + pi.flags |= ATA_FLAG_NCQ; + if (hpriv->hpriv.cap & HOST_CAP_PMP) { + pi.flags |= ATA_FLAG_PMP; + if (hpriv->hpriv.cap & HOST_CAP_FBS) + hpriv->hpriv.flags |= AHCI_HFLAG_YES_FBS; + } + ahci_set_em_messages(&hpriv->hpriv, &pi); + + /* CAP.NP sometimes indicate the index of the last enabled + * port, at other times, that of the last possible port, so + * determining the maximum port number requires looking at + * both CAP.NP and port_map. + */ + n_ports = max(ahci_nr_ports(hpriv->hpriv.cap), + fls(hpriv->hpriv.port_map)); + + host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports); + if (!host) { + dev_err(&pdev->dev, "can not allocate host pinfo\n"); + rc = -ENOMEM; + goto error; + } + + host->private_data = hpriv; + + if (!(hpriv->hpriv.cap & HOST_CAP_SSS) || ahci_ignore_sss) + host->flags |= ATA_HOST_PARALLEL_SCAN; + else + dev_warn(&pdev->dev, + "ahci: SSS flag set, parallel bus scan disabled\n"); + + if (pi.flags & ATA_FLAG_EM) + ahci_reset_em(host); + + for (i = 0; i < host->n_ports; i++) { + struct ata_port *ap = host->ports[i]; + + ata_port_desc(ap, "mmio 0x%llX", hpriv->mmio_phys); + ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80); + + /* set enclosure management message type */ + if (ap->flags & ATA_FLAG_EM) + ap->em_message_type = hpriv->hpriv.em_msg_type; + + /* disabled/not-implemented port */ + if (!(hpriv->hpriv.port_map & (1 << i))) + ap->ops = &ata_dummy_port_ops; + } + + rc = ahci_reset_controller(host); + if (rc) + goto error; + + ahci_init_controller(host); + ahci_print_info(host, "XGene-AHCI\n"); + + /* Setup DMA mask */ + dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)); + dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64)); + + rc = ata_host_activate(host, hpriv->irq, xgene_ahci_interrupt, + IRQF_SHARED, &xgene_ahci_sht); + if (rc) + goto error; + + dev_dbg(&pdev->dev, "X-Gene SATA host controller initialized\n"); + return 0; + +error: + devm_kfree(&pdev->dev, hpriv); + return rc; +} + +static int xgene_ahci_remove(struct platform_device *pdev) +{ + dev_dbg(&pdev->dev, "remove\n"); + return 0; +} + +#ifdef CONFIG_PM +static int xgene_ahci_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct ata_host *host = dev_get_drvdata(&pdev->dev); + struct xgene_ahci_context *hpriv = host->private_data; + void __iomem *mmio = hpriv->mmio_base; + u32 ctl; + int rc; + + dev_dbg(&pdev->dev, "suspend\n"); + + /* + * AHCI spec rev1.1 section 8.3.3: + * Software must disable interrupts prior to requesting a + * transition of the HBA to D3 state. + */ + ctl = readl(mmio + HOST_CTL); + ctl &= ~HOST_IRQ_EN; + writel(ctl, mmio + HOST_CTL); + readl(mmio + HOST_CTL); /* flush */ + + rc = ata_host_suspend(host, state); + if (rc) + return rc; + + return 0; +} + +static int xgene_ahci_resume(struct platform_device *pdev) +{ + struct ata_host *host = dev_get_drvdata(&pdev->dev); + struct xgene_ahci_context *hpriv = host->private_data; + int rc; + + dev_dbg(&pdev->dev, "resume\n"); + + if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND) { + rc = ahci_reset_controller(host); + if (rc) + return rc; + + ahci_init_controller(host); + } + + ata_host_resume(host); + return 0; +} +#endif + +static const struct acpi_device_id xgene_ahci_acpi_match[] = { + {"APMC0D00", 0}, + {}, +}; + +MODULE_DEVICE_TABLE(acpi, xgene_ahci_acpi_match); + +static const struct of_device_id xgene_ahci_of_match[] = { + {.compatible = "apm,xgene-ahci",}, + {}, +}; + +MODULE_DEVICE_TABLE(of, xgene_ahci_of_match); + +static struct platform_driver xgene_ahci_driver = { + .driver = { + .name = "xgene-ahci", + .owner = THIS_MODULE, + .of_match_table = xgene_ahci_of_match, + .acpi_match_table = ACPI_PTR(xgene_ahci_acpi_match), + }, + .probe = xgene_ahci_probe, + .remove = xgene_ahci_remove, +#ifdef CONFIG_PM + .suspend = xgene_ahci_suspend, + .resume = xgene_ahci_resume, +#endif +}; + +module_platform_driver(xgene_ahci_driver); + +MODULE_DESCRIPTION("APM X-Gene AHCI SATA driver"); +MODULE_AUTHOR("Loc Ho <lho@xxxxxxx>"); +MODULE_LICENSE("GPL"); +MODULE_VERSION("0.4"); -- 1.5.5 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
