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linux-sg2042/drivers/ata/ahci_xgene.c

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/*
* AppliedMicro X-Gene SoC SATA Host Controller Driver
*
* Copyright (c) 2014, Applied Micro Circuits Corporation
* Author: Loc Ho <lho@apm.com>
* Tuan Phan <tphan@apm.com>
* Suman Tripathi <stripathi@apm.com>
*
* 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/>.
*
* NOTE: PM support is not currently available.
*
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/ahci_platform.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/phy/phy.h>
#include "ahci.h"
/* Max # of disk per a controller */
#define MAX_AHCI_CHN_PERCTR 2
/* MUX CSR */
#define SATA_ENET_CONFIG_REG 0x00000000
#define CFG_SATA_ENET_SELECT_MASK 0x00000001
/* SATA core host controller CSR */
#define SLVRDERRATTRIBUTES 0x00000000
#define SLVWRERRATTRIBUTES 0x00000004
#define MSTRDERRATTRIBUTES 0x00000008
#define MSTWRERRATTRIBUTES 0x0000000c
#define BUSCTLREG 0x00000014
#define IOFMSTRWAUX 0x00000018
#define INTSTATUSMASK 0x0000002c
#define ERRINTSTATUS 0x00000030
#define ERRINTSTATUSMASK 0x00000034
/* SATA host AHCI CSR */
#define PORTCFG 0x000000a4
#define PORTADDR_SET(dst, src) \
(((dst) & ~0x0000003f) | (((u32)(src)) & 0x0000003f))
#define PORTPHY1CFG 0x000000a8
#define PORTPHY1CFG_FRCPHYRDY_SET(dst, src) \
(((dst) & ~0x00100000) | (((u32)(src) << 0x14) & 0x00100000))
#define PORTPHY2CFG 0x000000ac
#define PORTPHY3CFG 0x000000b0
#define PORTPHY4CFG 0x000000b4
#define PORTPHY5CFG 0x000000b8
#define SCTL0 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 0x000000bc
#define PORTAXICFG_OUTTRANS_SET(dst, src) \
(((dst) & ~0x00f00000) | (((u32)(src) << 0x14) & 0x00f00000))
#define PORTRANSCFG 0x000000c8
#define PORTRANSCFG_RXWM_SET(dst, src) \
(((dst) & ~0x0000007f) | (((u32)(src)) & 0x0000007f))
/* SATA host controller AXI CSR */
#define INT_SLV_TMOMASK 0x00000010
/* SATA diagnostic CSR */
#define CFG_MEM_RAM_SHUTDOWN 0x00000070
#define BLOCK_MEM_RDY 0x00000074
/* Max retry for link down */
#define MAX_LINK_DOWN_RETRY 3
struct xgene_ahci_context {
struct ahci_host_priv *hpriv;
struct device *dev;
u8 last_cmd[MAX_AHCI_CHN_PERCTR]; /* tracking the last command issued*/
void __iomem *csr_core; /* Core CSR address of IP */
void __iomem *csr_diag; /* Diag CSR address of IP */
void __iomem *csr_axi; /* AXI CSR address of IP */
void __iomem *csr_mux; /* MUX CSR address of IP */
};
static int xgene_ahci_init_memram(struct xgene_ahci_context *ctx)
{
dev_dbg(ctx->dev, "Release memory from shutdown\n");
writel(0x0, ctx->csr_diag + CFG_MEM_RAM_SHUTDOWN);
readl(ctx->csr_diag + CFG_MEM_RAM_SHUTDOWN); /* Force a barrier */
msleep(1); /* reset may take up to 1ms */
if (readl(ctx->csr_diag + BLOCK_MEM_RDY) != 0xFFFFFFFF) {
dev_err(ctx->dev, "failed to release memory from shutdown\n");
return -ENODEV;
}
return 0;
}
/**
* xgene_ahci_restart_engine - Restart the dma engine.
* @ap : ATA port of interest
*
* Restarts the dma engine inside the controller.
*/
static int xgene_ahci_restart_engine(struct ata_port *ap)
{
struct ahci_host_priv *hpriv = ap->host->private_data;
ahci_stop_engine(ap);
ahci_start_fis_rx(ap);
hpriv->start_engine(ap);
return 0;
}
/**
* xgene_ahci_qc_issue - Issue commands to the device
* @qc: Command to issue
*
* Due to Hardware errata for IDENTIFY DEVICE command and PACKET
* command of ATAPI protocol set, the controller cannot clear the BSY bit
* after receiving the PIO setup FIS. This results in the DMA state machine
* going into the CMFatalErrorUpdate state and locks up. By restarting the
* DMA engine, it removes the controller out of lock up state.
*/
static unsigned int xgene_ahci_qc_issue(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ahci_host_priv *hpriv = ap->host->private_data;
struct xgene_ahci_context *ctx = hpriv->plat_data;
int rc = 0;
if (unlikely((ctx->last_cmd[ap->port_no] == ATA_CMD_ID_ATA) ||
(ctx->last_cmd[ap->port_no] == ATA_CMD_PACKET)))
xgene_ahci_restart_engine(ap);
rc = ahci_qc_issue(qc);
/* Save the last command issued */
ctx->last_cmd[ap->port_no] = qc->tf.command;
return rc;
}
static bool xgene_ahci_is_memram_inited(struct xgene_ahci_context *ctx)
{
void __iomem *diagcsr = ctx->csr_diag;
return (readl(diagcsr + CFG_MEM_RAM_SHUTDOWN) == 0 &&
readl(diagcsr + BLOCK_MEM_RDY) == 0xFFFFFFFF);
}
/**
* xgene_ahci_read_id - Read ID data from the specified device
* @dev: device
* @tf: proposed taskfile
* @id: data buffer
*
* This custom read ID function is required due to the fact that the HW
* does not support DEVSLP.
*/
static unsigned int xgene_ahci_read_id(struct ata_device *dev,
struct ata_taskfile *tf, u16 *id)
{
u32 err_mask;
err_mask = ata_do_dev_read_id(dev, tf, id);
if (err_mask)
return err_mask;
/*
* Mask reserved area. Word78 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 8 (DEVSLP bit) as we don't support DEVSLP
*/
id[ATA_ID_FEATURE_SUPP] &= cpu_to_le16(~(1 << 8));
return 0;
}
static void xgene_ahci_set_phy_cfg(struct xgene_ahci_context *ctx, int channel)
{
void __iomem *mmio = ctx->hpriv->mmio;
u32 val;
dev_dbg(ctx->dev, "port configure mmio 0x%p channel %d\n",
mmio, channel);
val = readl(mmio + PORTCFG);
val = PORTADDR_SET(val, channel == 0 ? 2 : 3);
writel(val, mmio + PORTCFG);
readl(mmio + PORTCFG); /* Force a barrier */
/* Disable fix rate */
writel(0x0001fffe, mmio + PORTPHY1CFG);
readl(mmio + PORTPHY1CFG); /* Force a barrier */
writel(0x28183219, mmio + PORTPHY2CFG);
readl(mmio + PORTPHY2CFG); /* Force a barrier */
writel(0x13081008, mmio + PORTPHY3CFG);
readl(mmio + PORTPHY3CFG); /* Force a barrier */
writel(0x00480815, mmio + PORTPHY4CFG);
readl(mmio + PORTPHY4CFG); /* Force a barrier */
/* Set window negotiation */
val = readl(mmio + PORTPHY5CFG);
val = PORTPHY5CFG_RTCHG_SET(val, 0x300);
writel(val, mmio + PORTPHY5CFG);
readl(mmio + PORTPHY5CFG); /* Force a barrier */
val = readl(mmio + PORTAXICFG);
val = PORTAXICFG_EN_CONTEXT_SET(val, 0x1); /* Enable context mgmt */
val = PORTAXICFG_OUTTRANS_SET(val, 0xe); /* Set outstanding */
writel(val, mmio + PORTAXICFG);
readl(mmio + PORTAXICFG); /* Force a barrier */
/* Set the watermark threshold of the receive FIFO */
val = readl(mmio + PORTRANSCFG);
val = PORTRANSCFG_RXWM_SET(val, 0x30);
writel(val, mmio + PORTRANSCFG);
}
/**
* xgene_ahci_do_hardreset - Issue the actual COMRESET
* @link: link to reset
* @deadline: deadline jiffies for the operation
* @online: Return value to indicate if device online
*
* Due to the limitation of the hardware PHY, a difference set of setting is
* required for each supported disk speed - Gen3 (6.0Gbps), Gen2 (3.0Gbps),
* and Gen1 (1.5Gbps). Otherwise during long IO stress test, the PHY will
* report disparity error and etc. In addition, during COMRESET, there can
* be error reported in the register PORT_SCR_ERR. For SERR_DISPARITY and
* SERR_10B_8B_ERR, the PHY receiver line must be reseted. Also during long
* reboot cycle regression, sometimes the PHY reports link down even if the
* device is present because of speed negotiation failure. so need to retry
* the COMRESET to get the link up. The following algorithm is followed to
* proper configure the hardware PHY during COMRESET:
*
* Alg Part 1:
* 1. Start the PHY at Gen3 speed (default setting)
* 2. Issue the COMRESET
* 3. If no link, go to Alg Part 3
* 4. If link up, determine if the negotiated speed matches the PHY
* configured speed
* 5. If they matched, go to Alg Part 2
* 6. If they do not matched and first time, configure the PHY for the linked
* up disk speed and repeat step 2
* 7. Go to Alg Part 2
*
* Alg Part 2:
* 1. On link up, if there are any SERR_DISPARITY and SERR_10B_8B_ERR error
* reported in the register PORT_SCR_ERR, then reset the PHY receiver line
* 2. Go to Alg Part 4
*
* Alg Part 3:
* 1. Check the PORT_SCR_STAT to see whether device presence detected but PHY
* communication establishment failed and maximum link down attempts are
* less than Max attempts 3 then goto Alg Part 1.
* 2. Go to Alg Part 4.
*
* Alg Part 4:
* 1. Clear any pending from register PORT_SCR_ERR.
*
* NOTE: For the initial version, we will NOT support Gen1/Gen2. In addition
* and until the underlying PHY supports an method to reset the receiver
* line, on detection of SERR_DISPARITY or SERR_10B_8B_ERR errors,
* an warning message will be printed.
*/
static int xgene_ahci_do_hardreset(struct ata_link *link,
unsigned long deadline, bool *online)
{
const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
struct ata_port *ap = link->ap;
struct ahci_host_priv *hpriv = ap->host->private_data;
struct xgene_ahci_context *ctx = hpriv->plat_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_down_retry = 0;
int rc;
u32 val, sstatus;
do {
/* clear D2H reception area to properly wait for D2H FIS */
ata_tf_init(link->device, &tf);
tf.command = ATA_BUSY;
ata_tf_to_fis(&tf, 0, 0, d2h_fis);
rc = sata_link_hardreset(link, timing, deadline, online,
ahci_check_ready);
if (*online) {
val = readl(port_mmio + PORT_SCR_ERR);
if (val & (SERR_DISPARITY | SERR_10B_8B_ERR))
dev_warn(ctx->dev, "link has error\n");
break;
}
sata_scr_read(link, SCR_STATUS, &sstatus);
} while (link_down_retry++ < MAX_LINK_DOWN_RETRY &&
(sstatus & 0xff) == 0x1);
/* clear all errors if any pending */
val = readl(port_mmio + PORT_SCR_ERR);
writel(val, port_mmio + PORT_SCR_ERR);
return rc;
}
static int xgene_ahci_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
struct ata_port *ap = link->ap;
struct ahci_host_priv *hpriv = ap->host->private_data;
void __iomem *port_mmio = ahci_port_base(ap);
bool online;
int rc;
u32 portcmd_saved;
u32 portclb_saved;
u32 portclbhi_saved;
u32 portrxfis_saved;
u32 portrxfishi_saved;
/* As hardreset resets these CSR, 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, deadline, &online);
/* As controller hardreset clears them, 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);
hpriv->start_engine(ap);
if (online)
*class = ahci_dev_classify(ap);
return rc;
}
static void xgene_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 xgene_ahci_ops = {
.inherits = &ahci_ops,
.host_stop = xgene_ahci_host_stop,
.hardreset = xgene_ahci_hardreset,
.read_id = xgene_ahci_read_id,
.qc_issue = xgene_ahci_qc_issue,
};
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 int xgene_ahci_hw_init(struct ahci_host_priv *hpriv)
{
struct xgene_ahci_context *ctx = hpriv->plat_data;
int i;
int rc;
u32 val;
/* Remove IP RAM out of shutdown */
rc = xgene_ahci_init_memram(ctx);
if (rc)
return rc;
for (i = 0; i < MAX_AHCI_CHN_PERCTR; i++)
xgene_ahci_set_phy_cfg(ctx, i);
/* AXI disable Mask */
writel(0xffffffff, hpriv->mmio + HOST_IRQ_STAT);
readl(hpriv->mmio + HOST_IRQ_STAT); /* Force a barrier */
writel(0, ctx->csr_core + INTSTATUSMASK);
val = readl(ctx->csr_core + INTSTATUSMASK); /* Force a barrier */
dev_dbg(ctx->dev, "top level interrupt mask 0x%X value 0x%08X\n",
INTSTATUSMASK, val);
writel(0x0, ctx->csr_core + ERRINTSTATUSMASK);
readl(ctx->csr_core + ERRINTSTATUSMASK); /* Force a barrier */
writel(0x0, ctx->csr_axi + INT_SLV_TMOMASK);
readl(ctx->csr_axi + INT_SLV_TMOMASK);
/* Enable AXI Interrupt */
writel(0xffffffff, ctx->csr_core + SLVRDERRATTRIBUTES);
writel(0xffffffff, ctx->csr_core + SLVWRERRATTRIBUTES);
writel(0xffffffff, ctx->csr_core + MSTRDERRATTRIBUTES);
writel(0xffffffff, ctx->csr_core + MSTWRERRATTRIBUTES);
/* Enable coherency */
val = readl(ctx->csr_core + BUSCTLREG);
val &= ~0x00000002; /* Enable write coherency */
val &= ~0x00000001; /* Enable read coherency */
writel(val, ctx->csr_core + BUSCTLREG);
val = readl(ctx->csr_core + IOFMSTRWAUX);
val |= (1 << 3); /* Enable read coherency */
val |= (1 << 9); /* Enable write coherency */
writel(val, ctx->csr_core + IOFMSTRWAUX);
val = readl(ctx->csr_core + IOFMSTRWAUX);
dev_dbg(ctx->dev, "coherency 0x%X value 0x%08X\n",
IOFMSTRWAUX, val);
return rc;
}
static int xgene_ahci_mux_select(struct xgene_ahci_context *ctx)
{
u32 val;
/* Check for optional MUX resource */
if (!ctx->csr_mux)
return 0;
val = readl(ctx->csr_mux + SATA_ENET_CONFIG_REG);
val &= ~CFG_SATA_ENET_SELECT_MASK;
writel(val, ctx->csr_mux + SATA_ENET_CONFIG_REG);
val = readl(ctx->csr_mux + SATA_ENET_CONFIG_REG);
return val & CFG_SATA_ENET_SELECT_MASK ? -1 : 0;
}
static int xgene_ahci_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ahci_host_priv *hpriv;
struct xgene_ahci_context *ctx;
struct resource *res;
int rc;
hpriv = ahci_platform_get_resources(pdev);
if (IS_ERR(hpriv))
return PTR_ERR(hpriv);
ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
hpriv->plat_data = ctx;
ctx->hpriv = hpriv;
ctx->dev = dev;
/* Retrieve the IP core resource */
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
ctx->csr_core = devm_ioremap_resource(dev, res);
if (IS_ERR(ctx->csr_core))
return PTR_ERR(ctx->csr_core);
/* Retrieve the IP diagnostic resource */
res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
ctx->csr_diag = devm_ioremap_resource(dev, res);
if (IS_ERR(ctx->csr_diag))
return PTR_ERR(ctx->csr_diag);
/* Retrieve the IP AXI resource */
res = platform_get_resource(pdev, IORESOURCE_MEM, 3);
ctx->csr_axi = devm_ioremap_resource(dev, res);
if (IS_ERR(ctx->csr_axi))
return PTR_ERR(ctx->csr_axi);
/* Retrieve the optional IP mux resource */
res = platform_get_resource(pdev, IORESOURCE_MEM, 4);
if (res) {
void __iomem *csr = devm_ioremap_resource(dev, res);
if (IS_ERR(csr))
return PTR_ERR(csr);
ctx->csr_mux = csr;
}
dev_dbg(dev, "VAddr 0x%p Mmio VAddr 0x%p\n", ctx->csr_core,
hpriv->mmio);
/* Select ATA */
if ((rc = xgene_ahci_mux_select(ctx))) {
dev_err(dev, "SATA mux selection failed error %d\n", rc);
return -ENODEV;
}
if (xgene_ahci_is_memram_inited(ctx)) {
dev_info(dev, "skip clock and PHY initialization\n");
goto skip_clk_phy;
}
/* Due to errata, HW requires full toggle transition */
rc = ahci_platform_enable_clks(hpriv);
if (rc)
goto disable_resources;
ahci_platform_disable_clks(hpriv);
rc = ahci_platform_enable_resources(hpriv);
if (rc)
goto disable_resources;
/* Configure the host controller */
xgene_ahci_hw_init(hpriv);
skip_clk_phy:
hpriv->flags = AHCI_HFLAG_NO_PMP | AHCI_HFLAG_NO_NCQ;
rc = ahci_platform_init_host(pdev, hpriv, &xgene_ahci_port_info);
if (rc)
goto disable_resources;
dev_dbg(dev, "X-Gene SATA host controller initialized\n");
return 0;
disable_resources:
ahci_platform_disable_resources(hpriv);
return rc;
}
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 = {
.probe = xgene_ahci_probe,
.remove = ata_platform_remove_one,
.driver = {
.name = "xgene-ahci",
.of_match_table = xgene_ahci_of_match,
},
};
module_platform_driver(xgene_ahci_driver);
MODULE_DESCRIPTION("APM X-Gene AHCI SATA driver");
MODULE_AUTHOR("Loc Ho <lho@apm.com>");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.4");
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