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openwrt/target/linux/oxnas/files/drivers/ata/sata_oxnas.c
Felix Fietkau 93192e65e8 oxnas: sata_oxnas: make irq handler more readable 
safed one level of indention by using 'continue' instead of a
lengthy if-clause.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
v2: use logic-AND instead of '?' operator when checking for hw bug 6320

SVN-Revision: 43768
2014-12-22 20:47:10 +00:00

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/*
* sata_oxnas
* A driver to interface the 934 based sata core present in the ox820
* with libata and scsi
* based on sata_oxnas driver by Ma Haijun <mahaijuns@gmail.com>
* based on ox820 sata code by:
* Copyright (c) 2007 Oxford Semiconductor Ltd.
*
* 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, 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.
*/
#include <linux/ata.h>
#include <linux/libata.h>
#include <linux/of_platform.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/clk.h>
#include <linux/reset.h>
#include <mach/utils.h>
/* sgdma request structure */
struct sgdma_request {
volatile u32 qualifier;
volatile u32 control;
dma_addr_t src_pa;
dma_addr_t dst_pa;
} __packed __aligned(4);
/* Controller information */
enum {
SATA_OXNAS_MAX_PRD = 254,
SATA_OXNAS_DMA_SIZE = SATA_OXNAS_MAX_PRD *
sizeof(struct ata_bmdma_prd) +
sizeof(struct sgdma_request),
SATA_OXNAS_MAX_PORTS = 2,
/** The different Oxsemi SATA core version numbers */
SATA_OXNAS_CORE_VERSION = 0x1f3,
SATA_OXNAS_IRQ_FLAG = IRQF_SHARED,
SATA_OXNAS_HOST_FLAGS = (ATA_FLAG_SATA | ATA_FLAG_PIO_DMA |
ATA_FLAG_NO_ATAPI /*| ATA_FLAG_NCQ*/),
SATA_OXNAS_QUEUE_DEPTH = 32,
SATA_OXNAS_DMA_BOUNDARY = 0xFFFFFFFF,
};
/*
* SATA Port Registers
*/
enum {
/** sata host port register offsets */
ORB1 = 0x00,
ORB2 = 0x04,
ORB3 = 0x08,
ORB4 = 0x0C,
ORB5 = 0x10,
MASTER_STATUS = 0x10,
FIS_CTRL = 0x18,
FIS_DATA = 0x1C,
INT_STATUS = 0x30,
INT_CLEAR = 0x30,
INT_ENABLE = 0x34,
INT_DISABLE = 0x38,
VERSION = 0x3C,
SATA_CONTROL = 0x5C,
SATA_COMMAND = 0x60,
HID_FEATURES = 0x64,
PORT_CONTROL = 0x68,
DRIVE_CONTROL = 0x6C,
/** These registers allow access to the link layer registers
that reside in a different clock domain to the processor bus */
LINK_DATA = 0x70,
LINK_RD_ADDR = 0x74,
LINK_WR_ADDR = 0x78,
LINK_CONTROL = 0x7C,
/* window control */
WIN1LO = 0x80,
WIN1HI = 0x84,
WIN2LO = 0x88,
WIN2HI = 0x8C,
WIN0_CONTROL = 0x90,
};
/** sata port register bits */
enum{
/**
* commands to issue in the master status to tell it to move shadow ,
* registers to the actual device ,
*/
SATA_OPCODE_MASK = 0x00000007,
CMD_WRITE_TO_ORB_REGS_NO_COMMAND = 0x4,
CMD_WRITE_TO_ORB_REGS = 0x2,
CMD_SYNC_ESCAPE = 0x7,
CMD_CORE_BUSY = (1 << 7),
CMD_DRIVE_SELECT_SHIFT = 12,
CMD_DRIVE_SELECT_MASK = (0xf << CMD_DRIVE_SELECT_SHIFT),
/** interrupt bits */
INT_END_OF_CMD = 1 << 0,
INT_LINK_SERROR = 1 << 1,
INT_ERROR = 1 << 2,
INT_LINK_IRQ = 1 << 3,
INT_REG_ACCESS_ERR = 1 << 7,
INT_BIST_FIS = 1 << 11,
INT_MASKABLE = INT_END_OF_CMD |
INT_LINK_SERROR |
INT_ERROR |
INT_LINK_IRQ |
INT_REG_ACCESS_ERR |
INT_BIST_FIS,
INT_WANT = INT_END_OF_CMD |
INT_LINK_SERROR |
INT_REG_ACCESS_ERR |
INT_ERROR,
INT_ERRORS = INT_LINK_SERROR |
INT_REG_ACCESS_ERR |
INT_ERROR,
/** raw interrupt bits, unmaskable, but do not generate interrupts */
RAW_END_OF_CMD = INT_END_OF_CMD << 16,
RAW_LINK_SERROR = INT_LINK_SERROR << 16,
RAW_ERROR = INT_ERROR << 16,
RAW_LINK_IRQ = INT_LINK_IRQ << 16,
RAW_REG_ACCESS_ERR = INT_REG_ACCESS_ERR << 16,
RAW_BIST_FIS = INT_BIST_FIS << 16,
RAW_WANT = INT_WANT << 16,
RAW_ERRORS = INT_ERRORS << 16,
/**
* variables to write to the device control register to set the current
* device, ie. master or slave.
*/
DR_CON_48 = 2,
DR_CON_28 = 0,
SATA_CTL_ERR_MASK = 0x00000016,
};
/* ATA SGDMA register offsets */
enum {
SGDMA_CONTROL = 0x0,
SGDMA_STATUS = 0x4,
SGDMA_REQUESTPTR = 0x8,
SGDMA_RESETS = 0xC,
SGDMA_CORESIZE = 0x10,
};
/* DMA controller register offsets */
enum {
DMA_CONTROL = 0x0,
DMA_CORESIZE = 0x20,
DMA_CONTROL_RESET = (1 << 12),
};
enum {
/* see DMA core docs for the values. Out means from memory (bus A) out
* to disk (bus B) */
SGDMA_REQCTL0OUT = 0x0497c03d,
/* burst mode disabled when no micro code used */
SGDMA_REQCTL0IN = 0x0493a3c1,
SGDMA_REQCTL1OUT = 0x0497c07d,
SGDMA_REQCTL1IN = 0x0497a3c5,
SGDMA_CONTROL_NOGO = 0x3e,
SGDMA_CONTROL_GO = SGDMA_CONTROL_NOGO | 1,
SGDMA_ERRORMASK = 0x3f,
SGDMA_BUSY = 0x80,
SGDMA_RESETS_CTRL = 1 << 0,
SGDMA_RESETS_ARBT = 1 << 1,
SGDMA_RESETS_AHB = 1 << 2,
SGDMA_RESETS_ALL = SGDMA_RESETS_CTRL |
SGDMA_RESETS_ARBT |
SGDMA_RESETS_AHB,
/* Final EOTs */
SGDMA_REQQUAL = 0x00220001,
};
/** SATA core register offsets */
enum {
DM_DBG1 = 0x000,
RAID_SET = 0x004,
DM_DBG2 = 0x008,
DATACOUNT_PORT0 = 0x010,
DATACOUNT_PORT1 = 0x014,
CORE_INT_STATUS = 0x030,
CORE_INT_CLEAR = 0x030,
CORE_INT_ENABLE = 0x034,
CORE_INT_DISABLE = 0x038,
CORE_REBUILD_ENABLE = 0x050,
CORE_FAILED_PORT_R = 0x054,
DEVICE_CONTROL = 0x068,
EXCESS = 0x06C,
RAID_SIZE_LOW = 0x070,
RAID_SIZE_HIGH = 0x074,
PORT_ERROR_MASK = 0x078,
IDLE_STATUS = 0x07C,
RAID_CONTROL = 0x090,
DATA_PLANE_CTRL = 0x0AC,
CORE_DATAPLANE_STAT = 0x0b8,
PROC_PC = 0x100,
CONFIG_IN = 0x3d8,
PROC_START = 0x3f0,
PROC_RESET = 0x3f4,
UCODE_STORE = 0x1000,
RAID_WP_BOT_LOW = 0x1FF0,
RAID_WP_BOT_HIGH = 0x1FF4,
RAID_WP_TOP_LOW = 0x1FF8,
RAID_WP_TOP_HIGH = 0x1FFC,
DATA_MUX_RAM0 = 0x8000,
DATA_MUX_RAM1 = 0xA000,
PORT_SIZE = 0x10000,
};
enum {
/* Sata core debug1 register bits */
CORE_PORT0_DATA_DIR_BIT = 20,
CORE_PORT1_DATA_DIR_BIT = 21,
CORE_PORT0_DATA_DIR = 1 << CORE_PORT0_DATA_DIR_BIT,
CORE_PORT1_DATA_DIR = 1 << CORE_PORT1_DATA_DIR_BIT,
/** sata core control register bits */
SCTL_CLR_ERR = 0x00003016,
RAID_CLR_ERR = 0x0000011e,
/* Interrupts direct from the ports */
NORMAL_INTS_WANTED = 0x00000303,
/* shift these left by port number */
COREINT_HOST = 0x00000001,
COREINT_END = 0x00000100,
CORERAW_HOST = COREINT_HOST << 16,
CORERAW_END = COREINT_END << 16,
/* Interrupts from the RAID controller only */
RAID_INTS_WANTED = 0x00008300,
/* The bits in the IDLE_STATUS that, when set indicate an idle core */
IDLE_CORES = (1 << 18) | (1 << 19),
/* Data plane control error-mask mask and bit, these bit in the data
* plane control mask out errors from the ports that prevent the SGDMA
* care from sending an interrupt */
DPC_ERROR_MASK = 0x00000300,
DPC_ERROR_MASK_BIT = 0x00000100,
/* enable jbod micro-code */
DPC_JBOD_UCODE = 1 << 0,
DPC_FIS_SWCH = 1 << 1,
/** Device Control register bits */
DEVICE_CONTROL_DMABT = 1 << 4,
DEVICE_CONTROL_ABORT = 1 << 2,
DEVICE_CONTROL_PAD = 1 << 3,
DEVICE_CONTROL_PADPAT = 1 << 16,
DEVICE_CONTROL_PRTRST = 1 << 8,
DEVICE_CONTROL_RAMRST = 1 << 12,
DEVICE_CONTROL_ATA_ERR_OVERRIDE = 1 << 28,
/** oxsemi HW raid modes */
OXNASSATA_NOTRAID = 0,
OXNASSATA_RAID0 = 1,
OXNASSATA_RAID1 = 2,
/** OX820 specific HW-RAID register values */
RAID_TWODISKS = 3,
UNKNOWN_MODE = ~0,
CONFIG_IN_RESUME = 2,
};
/* SATA PHY Registers */
enum {
PHY_STAT = 0x00,
PHY_DATA = 0x04,
};
enum {
STAT_READ_VALID = (1 << 21),
STAT_CR_ACK = (1 << 20),
STAT_CR_READ = (1 << 19),
STAT_CR_WRITE = (1 << 18),
STAT_CAP_DATA = (1 << 17),
STAT_CAP_ADDR = (1 << 16),
STAT_ACK_ANY = STAT_CR_ACK |
STAT_CR_READ |
STAT_CR_WRITE |
STAT_CAP_DATA |
STAT_CAP_ADDR,
CR_READ_ENABLE = (1 << 16),
CR_WRITE_ENABLE = (1 << 17),
CR_CAP_DATA = (1 << 18),
};
enum {
/* Link layer registers */
SERROR_IRQ_MASK = 5,
};
enum {
OXNAS_SATA_SOFTRESET = 1,
OXNAS_SATA_REINIT = 2,
};
enum {
OXNAS_SATA_UCODE_RAID0,
OXNAS_SATA_UCODE_RAID1,
OXNAS_SATA_UCODE_JBOD,
OXNAS_SATA_UCODE_NONE,
};
enum {
SATA_UNLOCKED,
SATA_WRITER,
SATA_READER,
SATA_REBUILD,
SATA_HWRAID,
SATA_SCSI_STACK
};
typedef irqreturn_t (*oxnas_sata_isr_callback_t)(int, unsigned long, int);
struct sata_oxnas_host_priv {
void __iomem *port_base;
void __iomem *dmactl_base;
void __iomem *sgdma_base;
void __iomem *core_base;
void __iomem *phy_base;
dma_addr_t dma_base;
void __iomem *dma_base_va;
size_t dma_size;
int irq;
int n_ports;
int current_ucode;
u32 port_frozen;
u32 port_in_eh;
struct clk *clk;
struct reset_control *rst_sata;
struct reset_control *rst_link;
struct reset_control *rst_phy;
spinlock_t phy_lock;
spinlock_t core_lock;
int core_locked;
int reentrant_port_no;
int hw_lock_count;
int direct_lock_count;
void *locker_uid;
int current_locker_type;
int scsi_nonblocking_attempts;
oxnas_sata_isr_callback_t isr_callback;
void *isr_arg;
wait_queue_head_t fast_wait_queue;
wait_queue_head_t scsi_wait_queue;
};
struct sata_oxnas_port_priv {
void __iomem *port_base;
void __iomem *dmactl_base;
void __iomem *sgdma_base;
void __iomem *core_base;
struct sgdma_request *sgdma_request;
dma_addr_t sgdma_request_pa;
};
static u8 sata_oxnas_check_status(struct ata_port *ap);
static int sata_oxnas_cleanup(struct ata_host *ah);
static void sata_oxnas_tf_load(struct ata_port *ap,
const struct ata_taskfile *tf);
static void sata_oxnas_irq_on(struct ata_port *ap);
static void sata_oxnas_post_reset_init(struct ata_port *ap);
static int sata_oxnas_acquire_hw(struct ata_port *ap, int may_sleep,
int timeout_jiffies);
static void sata_oxnas_release_hw(struct ata_port *ap);
static const void *HW_LOCKER_UID = (void *)0xdeadbeef;
/***************************************************************************
* ASIC access
***************************************************************************/
static void wait_cr_ack(void __iomem *phy_base)
{
while ((ioread32(phy_base + PHY_STAT) >> 16) & 0x1f)
; /* wait for an ack bit to be set */
}
static u16 read_cr(void __iomem *phy_base, u16 address)
{
iowrite32((u32)address, phy_base + PHY_STAT);
wait_cr_ack(phy_base);
iowrite32(CR_READ_ENABLE, phy_base + PHY_DATA);
wait_cr_ack(phy_base);
return (u16)ioread32(phy_base + PHY_STAT);
}
static void write_cr(void __iomem *phy_base, u16 data, u16 address)
{
iowrite32((u32)address, phy_base + PHY_STAT);
wait_cr_ack(phy_base);
iowrite32((data | CR_CAP_DATA), phy_base + PHY_DATA);
wait_cr_ack(phy_base);
iowrite32(CR_WRITE_ENABLE, phy_base + PHY_DATA);
wait_cr_ack(phy_base);
}
#define PH_GAIN 2
#define FR_GAIN 3
#define PH_GAIN_OFFSET 6
#define FR_GAIN_OFFSET 8
#define PH_GAIN_MASK (0x3 << PH_GAIN_OFFSET)
#define FR_GAIN_MASK (0x3 << FR_GAIN_OFFSET)
#define USE_INT_SETTING (1<<5)
void workaround5458(struct ata_host *ah)
{
struct sata_oxnas_host_priv *hd = ah->private_data;
void __iomem *phy_base = hd->phy_base;
u16 rx_control;
unsigned i;
for (i = 0; i < 2; i++) {
rx_control = read_cr(phy_base, 0x201d + (i << 8));
rx_control &= ~(PH_GAIN_MASK | FR_GAIN_MASK);
rx_control |= PH_GAIN << PH_GAIN_OFFSET;
rx_control |= (FR_GAIN << FR_GAIN_OFFSET) | USE_INT_SETTING;
write_cr(phy_base, rx_control, 0x201d+(i<<8));
}
}
/**
* allows access to the link layer registers
* @param link_reg the link layer register to access (oxsemi indexing ie
* 00 = static config, 04 = phy ctrl)
*/
void sata_oxnas_link_write(struct ata_port *ap, unsigned int link_reg, u32 val)
{
struct sata_oxnas_port_priv *pd = ap->private_data;
struct sata_oxnas_host_priv *hd = ap->host->private_data;
void __iomem *port_base = pd->port_base;
u32 patience;
unsigned long flags;
DPRINTK("P%d [0x%02x]->0x%08x\n", ap->port_no, link_reg, val);
spin_lock_irqsave(&hd->phy_lock, flags);
iowrite32(val, port_base + LINK_DATA);
/* accessed twice as a work around for a bug in the SATA abp bridge
* hardware (bug 6828) */
iowrite32(link_reg , port_base + LINK_WR_ADDR);
ioread32(port_base + LINK_WR_ADDR);
for (patience = 0x100000; patience > 0; --patience) {
if (ioread32(port_base + LINK_CONTROL) & 0x00000001)
break;
}
spin_unlock_irqrestore(&hd->phy_lock, flags);
}
static int sata_oxnas_scr_write_port(struct ata_port *ap, unsigned int sc_reg,
u32 val)
{
sata_oxnas_link_write(ap, 0x20 + (sc_reg * 4), val);
return 0;
}
static int sata_oxnas_scr_write(struct ata_link *link, unsigned int sc_reg,
u32 val)
{
return sata_oxnas_scr_write_port(link->ap, sc_reg, val);
}
u32 sata_oxnas_link_read(struct ata_port *ap, unsigned int link_reg)
{
struct sata_oxnas_port_priv *pd = ap->private_data;
struct sata_oxnas_host_priv *hd = ap->host->private_data;
void __iomem *port_base = pd->port_base;
u32 result;
u32 patience;
unsigned long flags;
spin_lock_irqsave(&hd->phy_lock, flags);
/* accessed twice as a work around for a bug in the SATA abp bridge
* hardware (bug 6828) */
iowrite32(link_reg, port_base + LINK_RD_ADDR);
ioread32(port_base + LINK_RD_ADDR);
for (patience = 0x100000; patience > 0; --patience) {
if (ioread32(port_base + LINK_CONTROL) & 0x00000001)
break;
}
if (patience == 0)
DPRINTK("link read timed out for port %d\n", ap->port_no);
result = ioread32(port_base + LINK_DATA);
spin_unlock_irqrestore(&hd->phy_lock, flags);
return result;
}
static int sata_oxnas_scr_read_port(struct ata_port *ap, unsigned int sc_reg,
u32 *val)
{
*val = sata_oxnas_link_read(ap, 0x20 + (sc_reg*4));
return 0;
}
static int sata_oxnas_scr_read(struct ata_link *link,
unsigned int sc_reg, u32 *val)
{
return sata_oxnas_scr_read_port(link->ap, sc_reg, val);
}
/**
* sata_oxnas_irq_clear is called during probe just before the interrupt handler is
* registered, to be sure hardware is quiet. It clears and masks interrupt bits
* in the SATA core.
*
* @param ap hardware with the registers in
*/
static void sata_oxnas_irq_clear(struct ata_port *ap)
{
struct sata_oxnas_port_priv *port_priv = ap->private_data;
/* clear pending interrupts */
iowrite32(~0, port_priv->port_base + INT_CLEAR);
iowrite32(COREINT_END, port_priv->core_base + CORE_INT_CLEAR);
}
/**
* qc_issue is used to make a command active, once the hardware and S/G tables
* have been prepared. IDE BMDMA drivers use the helper function
* ata_qc_issue_prot() for taskfile protocol-based dispatch. More advanced
* drivers roll their own ->qc_issue implementation, using this as the
* "issue new ATA command to hardware" hook.
* @param qc the queued command to issue
*/
static unsigned int sata_oxnas_qc_issue(struct ata_queued_cmd *qc)
{
struct sata_oxnas_port_priv *pd = qc->ap->private_data;
struct sata_oxnas_host_priv *hd = qc->ap->host->private_data;
void __iomem *port_base = pd->port_base;
void __iomem *core_base = pd->core_base;
int port_no = qc->ap->port_no;
int no_microcode = (hd->current_ucode == UNKNOWN_MODE);
u32 reg;
/* check the core is idle */
if (ioread32(port_base + SATA_COMMAND) & CMD_CORE_BUSY) {
int count = 0;
DPRINTK("core busy for a command on port %d\n",
qc->ap->port_no);
do {
mdelay(1);
if (++count > 100) {
DPRINTK("core busy for a command on port %d\n",
qc->ap->port_no);
/* CrazyDumpDebug(); */
sata_oxnas_cleanup(qc->ap->host);
}
} while (ioread32(port_base + SATA_COMMAND) & CMD_CORE_BUSY);
}
/* enable passing of error signals to DMA sub-core by clearing the
* appropriate bit */
reg = ioread32(core_base + DATA_PLANE_CTRL);
if (no_microcode)
reg |= (DPC_ERROR_MASK_BIT | (DPC_ERROR_MASK_BIT << 1));
reg &= ~(DPC_ERROR_MASK_BIT << port_no);
iowrite32(reg, core_base + DATA_PLANE_CTRL);
/* Disable all interrupts for ports and RAID controller */
iowrite32(~0, port_base + INT_DISABLE);
/* Disable all interrupts for core */
iowrite32(~0, core_base + CORE_INT_DISABLE);
wmb();
/* Load the command settings into the orb registers */
sata_oxnas_tf_load(qc->ap, &qc->tf);
/* both pio and dma commands use dma */
if (ata_is_dma(qc->tf.protocol) || ata_is_pio(qc->tf.protocol)) {
/* Start the DMA */
iowrite32(SGDMA_CONTROL_GO, pd->sgdma_base + SGDMA_CONTROL);
wmb();
}
/* enable End of command interrupt */
iowrite32(INT_WANT, port_base + INT_ENABLE);
iowrite32(COREINT_END, core_base + CORE_INT_ENABLE);
wmb();
/* Start the command */
reg = ioread32(port_base + SATA_COMMAND);
reg &= ~SATA_OPCODE_MASK;
reg |= CMD_WRITE_TO_ORB_REGS;
iowrite32(reg , port_base + SATA_COMMAND);
wmb();
return 0;
}
/**
* Will schedule the libATA error handler on the premise that there has
* been a hotplug event on the port specified
*/
void sata_oxnas_checkforhotplug(struct ata_port *ap)
{
DPRINTK("ENTER\n");
ata_ehi_hotplugged(&ap->link.eh_info);
ata_port_freeze(ap);
}
/**************************************************************************/
/* Locking */
/**************************************************************************/
/**
* The underlying function that controls access to the sata core
*
* @return non-zero indicates that you have acquired exclusive access to the
* sata core.
*/
static int __acquire_sata_core(
struct ata_host *ah,
int port_no,
oxnas_sata_isr_callback_t callback,
void *arg,
int may_sleep,
int timeout_jiffies,
int hw_access,
void *uid,
int locker_type)
{
unsigned long end = jiffies + timeout_jiffies;
int acquired = 0;
unsigned long flags;
int timed_out = 0;
struct sata_oxnas_host_priv *hd;
DEFINE_WAIT(wait);
if (!ah)
return acquired;
hd = ah->private_data;
spin_lock_irqsave(&hd->core_lock, flags);
DPRINTK("Entered uid %p, port %d, h/w count %d, d count %d, "
"callback %p, hw_access %d, core_locked %d, "
"reentrant_port_no %d, isr_callback %p\n",
uid, port_no, hd->hw_lock_count, hd->direct_lock_count,
callback, hw_access, hd->core_locked, hd->reentrant_port_no,
hd->isr_callback);
while (!timed_out) {
if (hd->core_locked ||
(!hw_access && hd->scsi_nonblocking_attempts)) {
/* Can only allow access if from SCSI/SATA stack and if
* reentrant access is allowed and this access is to the
* same port for which the lock is current held
*/
if (hw_access && (port_no == hd->reentrant_port_no)) {
BUG_ON(!hd->hw_lock_count);
++(hd->hw_lock_count);
DPRINTK("Allow SCSI/SATA re-entrant access to "
"uid %p port %d\n", uid, port_no);
acquired = 1;
break;
} else if (!hw_access) {
if ((locker_type == SATA_READER) &&
(hd->current_locker_type == SATA_READER)) {
WARN(1,
"Already locked by reader, "
"uid %p, locker_uid %p, "
"port %d, h/w count %d, "
"d count %d, hw_access %d\n",
uid, hd->locker_uid, port_no,
hd->hw_lock_count,
hd->direct_lock_count,
hw_access);
goto check_uid;
}
if ((locker_type != SATA_READER) &&
(locker_type != SATA_WRITER)) {
goto wait_for_lock;
}
check_uid:
WARN(uid == hd->locker_uid, "Attempt to lock "
"by locker type %d uid %p, already "
"locked by locker type %d with "
"locker_uid %p, port %d, "
"h/w count %d, d count %d, "
"hw_access %d\n", locker_type, uid,
hd->current_locker_type,
hd->locker_uid, port_no,
hd->hw_lock_count,
hd->direct_lock_count, hw_access);
}
} else {
WARN(hd->hw_lock_count || hd->direct_lock_count,
"Core unlocked but counts non-zero: uid %p, "
"locker_uid %p, port %d, h/w count %d, "
"d count %d, hw_access %d\n", uid,
hd->locker_uid, port_no, hd->hw_lock_count,
hd->direct_lock_count, hw_access);
BUG_ON(hd->current_locker_type != SATA_UNLOCKED);
WARN(hd->locker_uid, "Attempt to lock uid %p when "
"locker_uid %p is non-zero, port %d, "
"h/w count %d, d count %d, hw_access %d\n",
uid, hd->locker_uid, port_no, hd->hw_lock_count,
hd->direct_lock_count, hw_access);
if (!hw_access) {
/* Direct access attempting to acquire
* non-contented lock
*/
/* Must have callback for direct access */
BUG_ON(!callback);
/* Sanity check lock state */
BUG_ON(hd->reentrant_port_no != -1);
hd->isr_callback = callback;
hd->isr_arg = arg;
++(hd->direct_lock_count);
hd->current_locker_type = locker_type;
} else {
/* SCSI/SATA attempting to acquire
* non-contented lock
*/
/* No callbacks for SCSI/SATA access */
BUG_ON(callback);
/* No callback args for SCSI/SATA access */
BUG_ON(arg);
/* Sanity check lock state */
BUG_ON(hd->isr_callback);
BUG_ON(hd->isr_arg);
++(hd->hw_lock_count);
hd->reentrant_port_no = port_no;
hd->current_locker_type = SATA_SCSI_STACK;
}
hd->core_locked = 1;
hd->locker_uid = uid;
acquired = 1;
break;
}
wait_for_lock:
if (!may_sleep) {
DPRINTK("Denying for uid %p locker_type %d, "
"hw_access %d, port %d, current_locker_type %d as "
"cannot sleep\n", uid, locker_type, hw_access, port_no,
hd->current_locker_type);
if (hw_access)
++(hd->scsi_nonblocking_attempts);
break;
}
/* Core is locked and we're allowed to sleep, so wait to be
* awoken when the core is unlocked
*/
for (;;) {
prepare_to_wait(hw_access ? &hd->scsi_wait_queue :
&hd->fast_wait_queue,
&wait, TASK_UNINTERRUPTIBLE);
if (!hd->core_locked &&
!(!hw_access && hd->scsi_nonblocking_attempts)) {
/* We're going to use variables that will have
* been changed by the waker prior to clearing
* core_locked so we need to ensure we see
* changes to all those variables
*/
smp_rmb();
break;
}
if (time_after(jiffies, end)) {
printk(KERN_WARNING "__acquire_sata_core() "
"uid %p failing for port %d timed out, "
"locker_uid %p, h/w count %d, "
"d count %d, callback %p, hw_access %d, "
"core_locked %d, reentrant_port_no %d, "
"isr_callback %p, isr_arg %p\n", uid,
port_no, hd->locker_uid,
hd->hw_lock_count,
hd->direct_lock_count, callback,
hw_access, hd->core_locked,
hd->reentrant_port_no, hd->isr_callback,
hd->isr_arg);
timed_out = 1;
break;
}
spin_unlock_irqrestore(&hd->core_lock, flags);
if (!schedule_timeout(4*HZ)) {
printk(KERN_INFO "__acquire_sata_core() uid %p, "
"locker_uid %p, timed-out of "
"schedule(), checking overall timeout\n",
uid, hd->locker_uid);
}
spin_lock_irqsave(&hd->core_lock, flags);
}
finish_wait(hw_access ? &hd->scsi_wait_queue :
&hd->fast_wait_queue, &wait);
}
if (hw_access && acquired) {
if (hd->scsi_nonblocking_attempts)
hd->scsi_nonblocking_attempts = 0;
/* Wake any other SCSI/SATA waiters so they can get reentrant
* access to the same port if appropriate. This is because if
* the SATA core is locked by fast access, or SCSI/SATA access
* to other port, then can have >1 SCSI/SATA waiters on the wait
* list so want to give reentrant accessors a chance to get
* access ASAP
*/
if (!list_empty(&hd->scsi_wait_queue.task_list))
wake_up(&hd->scsi_wait_queue);
}
DPRINTK("Leaving uid %p with acquired = %d, port %d, callback %p\n",
uid, acquired, port_no, callback);
spin_unlock_irqrestore(&hd->core_lock, flags);
return acquired;
}
int sata_core_has_fast_waiters(struct ata_host *ah)
{
int has_waiters;
unsigned long flags;
struct sata_oxnas_host_priv *hd = ah->private_data;
spin_lock_irqsave(&hd->core_lock, flags);
has_waiters = !list_empty(&hd->fast_wait_queue.task_list);
spin_unlock_irqrestore(&hd->core_lock, flags);
return has_waiters;
}
EXPORT_SYMBOL(sata_core_has_fast_waiters);
int sata_core_has_scsi_waiters(struct ata_host *ah)
{
int has_waiters;
unsigned long flags;
struct sata_oxnas_host_priv *hd = ah->private_data;
spin_lock_irqsave(&hd->core_lock, flags);
has_waiters = hd->scsi_nonblocking_attempts ||
!list_empty(&hd->scsi_wait_queue.task_list);
spin_unlock_irqrestore(&hd->core_lock, flags);
return has_waiters;
}
EXPORT_SYMBOL(sata_core_has_scsi_waiters);
/*
* ata_port operation to gain ownership of the SATA hardware prior to issuing
* a command against a SATA host. Allows any number of users of the port against
* which the lock was first acquired, thus enforcing that only one SATA core
* port may be operated on at once.
*/
static int sata_oxnas_acquire_hw(
struct ata_port *ap,
int may_sleep,
int timeout_jiffies)
{
return __acquire_sata_core(ap->host, ap->port_no, NULL, 0, may_sleep,
timeout_jiffies, 1, (void *)HW_LOCKER_UID,
SATA_SCSI_STACK);
}
/*
* operation to release ownership of the SATA hardware
*/
static void sata_oxnas_release_hw(struct ata_port *ap)
{
unsigned long flags;
int released = 0;
struct sata_oxnas_host_priv *hd = ap->host->private_data;
spin_lock_irqsave(&hd->core_lock, flags);
DPRINTK("Entered port_no = %d, h/w count %d, d count %d, "
"core locked = %d, reentrant_port_no = %d, isr_callback %p\n",
ap->port_no, hd->hw_lock_count, hd->direct_lock_count,
hd->core_locked, hd->reentrant_port_no, hd->isr_callback);
if (!hd->core_locked) {
/* Nobody holds the SATA lock */
printk(KERN_WARNING "Nobody holds SATA lock, port_no %d\n",
ap->port_no);
released = 1;
} else if (!hd->hw_lock_count) {
/* SCSI/SATA has released without holding the lock */
printk(KERN_WARNING "SCSI/SATA does not hold SATA lock, "
"port_no %d\n", ap->port_no);
} else {
/* Trap incorrect usage */
BUG_ON(hd->reentrant_port_no == -1);
BUG_ON(ap->port_no != hd->reentrant_port_no);
BUG_ON(hd->direct_lock_count);
BUG_ON(hd->current_locker_type != SATA_SCSI_STACK);
WARN(!hd->locker_uid || (hd->locker_uid != HW_LOCKER_UID),
"Invalid locker uid %p, h/w count %d, d count %d, "
"reentrant_port_no %d, core_locked %d, "
"isr_callback %p\n", hd->locker_uid, hd->hw_lock_count,
hd->direct_lock_count, hd->reentrant_port_no,
hd->core_locked, hd->isr_callback);
if (--(hd->hw_lock_count)) {
DPRINTK("Still nested port_no %d\n", ap->port_no);
} else {
DPRINTK("Release port_no %d\n", ap->port_no);
hd->reentrant_port_no = -1;
hd->isr_callback = NULL;
hd->current_locker_type = SATA_UNLOCKED;
hd->locker_uid = 0;
hd->core_locked = 0;
released = 1;
wake_up(!list_empty(&hd->scsi_wait_queue.task_list) ?
&hd->scsi_wait_queue :
&hd->fast_wait_queue);
}
}
DPRINTK("Leaving, port_no %d, count %d\n", ap->port_no,
hd->hw_lock_count);
spin_unlock_irqrestore(&hd->core_lock, flags);
/* CONFIG_SATA_OX820_DIRECT_HWRAID */
/* if (released)
ox820hwraid_restart_queue();
} */
}
static inline int sata_oxnas_is_host_frozen(struct ata_host *ah)
{
struct sata_oxnas_host_priv *hd = ah->private_data;
smp_rmb();
return hd->port_in_eh || hd->port_frozen;
}
static inline u32 sata_oxnas_hostportbusy(struct ata_port *ap)
{
struct sata_oxnas_host_priv *hd = ap->host->private_data;
return (ioread32(hd->port_base + SATA_COMMAND) & CMD_CORE_BUSY) ||
(hd->n_ports > 1 &&
(ioread32(hd->port_base + PORT_SIZE + SATA_COMMAND) &
CMD_CORE_BUSY));
}
static inline u32 sata_oxnas_hostdmabusy(struct ata_port *ap)
{
struct sata_oxnas_port_priv *pd = ap->private_data;
return ioread32(pd->sgdma_base + SGDMA_STATUS) & SGDMA_BUSY;
}
/**
* Turns on the cores clock and resets it
*/
static void sata_oxnas_reset_core(struct ata_host *ah)
{
struct sata_oxnas_host_priv *host_priv = ah->private_data;
int n;
DPRINTK("ENTER\n");
clk_prepare_enable(host_priv->clk);
reset_control_assert(host_priv->rst_sata);
reset_control_assert(host_priv->rst_link);
reset_control_assert(host_priv->rst_phy);
udelay(50);
/* un-reset the PHY, then Link and Controller */
reset_control_deassert(host_priv->rst_phy);
udelay(50);
reset_control_deassert(host_priv->rst_sata);
reset_control_deassert(host_priv->rst_link);
udelay(50);
workaround5458(ah);
/* tune for sata compatibility */
sata_oxnas_link_write(ah->ports[0], 0x60, 0x2988);
for (n = 0; n < host_priv->n_ports; n++) {
/* each port in turn */
sata_oxnas_link_write(ah->ports[n], 0x70, 0x55629);
}
udelay(50);
}
/**
* Called after an identify device command has worked out what kind of device
* is on the port
*
* @param port The port to configure
* @param pdev The hardware associated with controlling the port
*/
static void sata_oxnas_dev_config(struct ata_device *pdev)
{
struct sata_oxnas_port_priv *pd = pdev->link->ap->private_data;
void __iomem *port_base = pd->port_base;
u32 reg;
DPRINTK("ENTER\n");
/* Set the bits to put the port into 28 or 48-bit node */
reg = ioread32(port_base + DRIVE_CONTROL);
reg &= ~3;
reg |= (pdev->flags & ATA_DFLAG_LBA48) ? DR_CON_48 : DR_CON_28;
iowrite32(reg, port_base + DRIVE_CONTROL);
/* if this is an ATA-6 disk, put port into ATA-5 auto translate mode */
if (pdev->flags & ATA_DFLAG_LBA48) {
reg = ioread32(port_base + PORT_CONTROL);
reg |= 2;
iowrite32(reg, port_base + PORT_CONTROL);
}
}
/**
* called to write a taskfile into the ORB registers
* @param ap hardware with the registers in
* @param tf taskfile to write to the registers
*/
static void sata_oxnas_tf_load(struct ata_port *ap,
const struct ata_taskfile *tf)
{
u32 count = 0;
u32 Orb1 = 0;
u32 Orb2 = 0;
u32 Orb3 = 0;
u32 Orb4 = 0;
u32 Command_Reg;
struct sata_oxnas_port_priv *port_priv = ap->private_data;
void __iomem *port_base = port_priv->port_base;
unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
/* wait a maximum of 10ms for the core to be idle */
do {
Command_Reg = ioread32(port_base + SATA_COMMAND);
if (!(Command_Reg & CMD_CORE_BUSY))
break;
count++;
udelay(50);
} while (count < 200);
/* check if the ctl register has interrupts disabled or enabled and
* modify the interrupt enable registers on the ata core as required */
if (tf->ctl & ATA_NIEN) {
/* interrupts disabled */
u32 mask = (COREINT_END << ap->port_no);
iowrite32(mask, port_priv->core_base + CORE_INT_DISABLE);
sata_oxnas_irq_clear(ap);
} else {
sata_oxnas_irq_on(ap);
}
Orb2 |= (tf->command) << 24;
/* write 48 or 28 bit tf parameters */
if (is_addr) {
/* set LBA bit as it's an address */
Orb1 |= (tf->device & ATA_LBA) << 24;
if (tf->flags & ATA_TFLAG_LBA48) {
Orb1 |= ATA_LBA << 24;
Orb2 |= (tf->hob_nsect) << 8;
Orb3 |= (tf->hob_lbal) << 24;
Orb4 |= (tf->hob_lbam) << 0;
Orb4 |= (tf->hob_lbah) << 8;
Orb4 |= (tf->hob_feature) << 16;
} else {
Orb3 |= (tf->device & 0xf) << 24;
}
/* write 28-bit lba */
Orb2 |= (tf->nsect) << 0;
Orb2 |= (tf->feature) << 16;
Orb3 |= (tf->lbal) << 0;
Orb3 |= (tf->lbam) << 8;
Orb3 |= (tf->lbah) << 16;
Orb4 |= (tf->ctl) << 24;
}
if (tf->flags & ATA_TFLAG_DEVICE)
Orb1 |= (tf->device) << 24;
ap->last_ctl = tf->ctl;
/* write values to registers */
iowrite32(Orb1, port_base + ORB1);
iowrite32(Orb2, port_base + ORB2);
iowrite32(Orb3, port_base + ORB3);
iowrite32(Orb4, port_base + ORB4);
}
void sata_oxnas_set_mode(struct ata_host *ah, u32 mode, u32 force)
{
struct sata_oxnas_host_priv *host_priv = ah->private_data;
void __iomem *core_base = host_priv->core_base;
unsigned int *src;
void __iomem *dst;
unsigned int progmicrocode = 0;
unsigned int changeparameters = 0;
u32 previous_mode;
/* these micro-code programs _should_ include the version word */
/* JBOD */
static const unsigned int jbod[] = {
0x07B400AC, 0x0228A280, 0x00200001, 0x00204002, 0x00224001,
0x00EE0009, 0x00724901, 0x01A24903, 0x00E40009, 0x00224001,
0x00621120, 0x0183C908, 0x00E20005, 0x00718908, 0x0198A206,
0x00621124, 0x0183C908, 0x00E20046, 0x00621104, 0x0183C908,
0x00E20015, 0x00EE009D, 0x01A3E301, 0x00E2001B, 0x0183C900,
0x00E2001B, 0x00210001, 0x00EE0020, 0x01A3E302, 0x00E2009D,
0x0183C901, 0x00E2009D, 0x00210002, 0x0235D700, 0x0208A204,
0x0071C908, 0x000F8207, 0x000FC207, 0x0071C920, 0x000F8507,
0x000FC507, 0x0228A240, 0x02269A40, 0x00094004, 0x00621104,
0x0180C908, 0x00E40031, 0x00621112, 0x01A3C801, 0x00E2002B,
0x00294000, 0x0228A220, 0x01A69ABF, 0x002F8000, 0x002FC000,
0x0198A204, 0x0001C022, 0x01B1A220, 0x0001C106, 0x00088007,
0x0183C903, 0x00E2009D, 0x0228A220, 0x0071890C, 0x0208A206,
0x0198A206, 0x0001C022, 0x01B1A220, 0x0001C106, 0x00088007,
0x00EE009D, 0x00621104, 0x0183C908, 0x00E2004A, 0x00EE009D,
0x01A3C901, 0x00E20050, 0x0021E7FF, 0x0183E007, 0x00E2009D,
0x00EE0054, 0x0061600B, 0x0021E7FF, 0x0183C507, 0x00E2009D,
0x01A3E301, 0x00E2005A, 0x0183C900, 0x00E2005A, 0x00210001,
0x00EE005F, 0x01A3E302, 0x00E20005, 0x0183C901, 0x00E20005,
0x00210002, 0x0235D700, 0x0208A204, 0x000F8109, 0x000FC109,
0x0071C918, 0x000F8407, 0x000FC407, 0x0001C022, 0x01A1A2BF,
0x0001C106, 0x00088007, 0x02269A40, 0x00094004, 0x00621112,
0x01A3C801, 0x00E4007F, 0x00621104, 0x0180C908, 0x00E4008D,
0x00621128, 0x0183C908, 0x00E2006C, 0x01A3C901, 0x00E2007B,
0x0021E7FF, 0x0183E007, 0x00E2007F, 0x00EE006C, 0x0061600B,
0x0021E7FF, 0x0183C507, 0x00E4006C, 0x00621111, 0x01A3C801,
0x00E2007F, 0x00621110, 0x01A3C801, 0x00E20082, 0x0228A220,
0x00621119, 0x01A3C801, 0x00E20086, 0x0001C022, 0x01B1A220,
0x0001C106, 0x00088007, 0x0198A204, 0x00294000, 0x01A69ABF,
0x002F8000, 0x002FC000, 0x0183C903, 0x00E20005, 0x0228A220,
0x0071890C, 0x0208A206, 0x0198A206, 0x0001C022, 0x01B1A220,
0x0001C106, 0x00088007, 0x00EE009D, 0x00621128, 0x0183C908,
0x00E20005, 0x00621104, 0x0183C908, 0x00E200A6, 0x0062111C,
0x0183C908, 0x00E20005, 0x0071890C, 0x0208A206, 0x0198A206,
0x00718908, 0x0208A206, 0x00EE0005, ~0
};
/* Bi-Modal RAID-0/1 */
static const unsigned int raid[] = {
0x00F20145, 0x00EE20FA, 0x00EE20A7, 0x0001C009, 0x00EE0004,
0x00220000, 0x0001000B, 0x037003FF, 0x00700018, 0x037003FE,
0x037043FD, 0x00704118, 0x037043FC, 0x01A3D240, 0x00E20017,
0x00B3C235, 0x00E40018, 0x0093C104, 0x00E80014, 0x0093C004,
0x00E80017, 0x01020000, 0x00274020, 0x00EE0083, 0x0080C904,
0x0093C104, 0x00EA0020, 0x0093C103, 0x00EC001F, 0x00220002,
0x00924104, 0x0005C009, 0x00EE0058, 0x0093CF04, 0x00E80026,
0x00900F01, 0x00600001, 0x00910400, 0x00EE0058, 0x00601604,
0x01A00003, 0x00E2002C, 0x01018000, 0x00274040, 0x00EE0083,
0x0093CF03, 0x00EC0031, 0x00220003, 0x00924F04, 0x0005C009,
0x00810104, 0x00B3C235, 0x00E20037, 0x0022C000, 0x00218210,
0x00EE0039, 0x0022C001, 0x00218200, 0x00600401, 0x00A04901,
0x00604101, 0x01A0C401, 0x00E20040, 0x00216202, 0x00EE0041,
0x00216101, 0x02018506, 0x00EE2141, 0x00904901, 0x00E20049,
0x00A00401, 0x00600001, 0x02E0C301, 0x00EE2141, 0x00216303,
0x037003EE, 0x01A3C001, 0x00E40105, 0x00250080, 0x00204000,
0x002042F1, 0x0004C001, 0x00230001, 0x00100006, 0x02C18605,
0x00100006, 0x01A3D502, 0x00E20055, 0x00EE0053, 0x00004009,
0x00000004, 0x00B3C235, 0x00E40062, 0x0022C001, 0x0020C000,
0x00EE2141, 0x0020C001, 0x00EE2141, 0x00EE006B, 0x0022C000,
0x0060D207, 0x00EE2141, 0x00B3C242, 0x00E20069, 0x01A3D601,
0x00E2006E, 0x02E0C301, 0x00EE2141, 0x00230001, 0x00301303,
0x00EE007B, 0x00218210, 0x01A3C301, 0x00E20073, 0x00216202,
0x00EE0074, 0x00216101, 0x02018506, 0x00214000, 0x037003EE,
0x01A3C001, 0x00E40108, 0x00230001, 0x00100006, 0x00250080,
0x00204000, 0x002042F1, 0x0004C001, 0x00EE007F, 0x0024C000,
0x01A3D1F0, 0x00E20088, 0x00230001, 0x00300000, 0x01A3D202,
0x00E20085, 0x00EE00A5, 0x00B3C800, 0x00E20096, 0x00218000,
0x00924709, 0x0005C009, 0x00B20802, 0x00E40093, 0x037103FD,
0x00710418, 0x037103FC, 0x00EE0006, 0x00220000, 0x0001000F,
0x00EE0006, 0x00800B0C, 0x00B00001, 0x00204000, 0x00208550,
0x00208440, 0x002083E0, 0x00208200, 0x00208100, 0x01008000,
0x037083EE, 0x02008212, 0x02008216, 0x01A3C201, 0x00E400A5,
0x0100C000, 0x00EE20FA, 0x02800000, 0x00208000, 0x00B24C00,
0x00E400AD, 0x00224001, 0x00724910, 0x0005C009, 0x00B3CDC4,
0x00E200D5, 0x00B3CD29, 0x00E200D5, 0x00B3CD20, 0x00E200D5,
0x00B3CD24, 0x00E200D5, 0x00B3CDC5, 0x00E200D2, 0x00B3CD39,
0x00E200D2, 0x00B3CD30, 0x00E200D2, 0x00B3CD34, 0x00E200D2,
0x00B3CDCA, 0x00E200CF, 0x00B3CD35, 0x00E200CF, 0x00B3CDC8,
0x00E200CC, 0x00B3CD25, 0x00E200CC, 0x00B3CD40, 0x00E200CB,
0x00B3CD42, 0x00E200CB, 0x01018000, 0x00EE0083, 0x0025C000,
0x036083EE, 0x0000800D, 0x00EE00D8, 0x036083EE, 0x00208035,
0x00EE00DA, 0x036083EE, 0x00208035, 0x00EE00DA, 0x00208007,
0x036083EE, 0x00208025, 0x036083EF, 0x02400000, 0x01A3D208,
0x00E200D8, 0x0067120A, 0x0021C000, 0x0021C224, 0x00220000,
0x00404B1C, 0x00600105, 0x00800007, 0x0020C00E, 0x00214000,
0x01004000, 0x01A0411F, 0x00404E01, 0x01A3C101, 0x00E200F1,
0x00B20800, 0x00E400D8, 0x00220001, 0x0080490B, 0x00B04101,
0x0040411C, 0x00EE00E1, 0x02269A01, 0x01020000, 0x02275D80,
0x01A3D202, 0x00E200F4, 0x01B75D80, 0x01030000, 0x01B69A01,
0x00EE00D8, 0x01A3D204, 0x00E40104, 0x00224000, 0x0020C00E,
0x0020001E, 0x00214000, 0x01004000, 0x0212490E, 0x00214001,
0x01004000, 0x02400000, 0x00B3D702, 0x00E80112, 0x00EE010E,
0x00B3D702, 0x00E80112, 0x00B3D702, 0x00E4010E, 0x00230001,
0x00EE0140, 0x00200005, 0x036003EE, 0x00204001, 0x00EE0116,
0x00230001, 0x00100006, 0x02C18605, 0x00100006, 0x01A3D1F0,
0x00E40083, 0x037003EE, 0x01A3C002, 0x00E20121, 0x0020A300,
0x0183D102, 0x00E20124, 0x037003EE, 0x01A00005, 0x036003EE,
0x01A0910F, 0x00B3C20F, 0x00E2012F, 0x01A3D502, 0x00E20116,
0x01A3C002, 0x00E20116, 0x00B3D702, 0x00E4012C, 0x00300000,
0x00EE011F, 0x02C18605, 0x00100006, 0x00EE0116, 0x01A3D1F0,
0x00E40083, 0x037003EE, 0x01A3C004, 0x00E20088, 0x00200003,
0x036003EE, 0x01A3D502, 0x00E20136, 0x00230001, 0x00B3C101,
0x00E4012C, 0x00100006, 0x02C18605, 0x00100006, 0x00204000,
0x00EE0116, 0x00100006, 0x01A3D1F0, 0x00E40083, 0x01000000,
0x02400000, ~0
};
DPRINTK("ENTER: mode:%d, force:%d\n", mode, force);
if (force)
previous_mode = UNKNOWN_MODE;
else
previous_mode = host_priv->current_ucode;
if (mode == previous_mode)
return;
host_priv->current_ucode = mode;
/* decide what needs to be done using the STD in my logbook */
switch (previous_mode) {
case OXNASSATA_RAID1:
switch (mode) {
case OXNASSATA_RAID0:
changeparameters = 1;
break;
case OXNASSATA_NOTRAID:
changeparameters = 1;
progmicrocode = 1;
break;
}
break;
case OXNASSATA_RAID0:
switch (mode) {
case OXNASSATA_RAID1:
changeparameters = 1;
break;
case OXNASSATA_NOTRAID:
changeparameters = 1;
progmicrocode = 1;
break;
}
break;
case OXNASSATA_NOTRAID:
switch (mode) {
case OXNASSATA_RAID0:
case OXNASSATA_RAID1:
changeparameters = 1;
progmicrocode = 1;
break;
}
break;
case UNKNOWN_MODE:
changeparameters = 1;
progmicrocode = 1;
break;
}
/* no need to reprogram everything if already in the right mode */
if (progmicrocode) {
/* reset micro-code processor */
iowrite32(1, core_base + PROC_RESET);
wmb();
/* select micro-code */
switch (mode) {
case OXNASSATA_RAID1:
case OXNASSATA_RAID0:
VPRINTK("Loading RAID micro-code\n");
src = (unsigned int *)&raid[1];
break;
case OXNASSATA_NOTRAID:
VPRINTK("Loading JBOD micro-code\n");
src = (unsigned int *)&jbod[1];
break;
default:
BUG();
break;
}
/* load micro code */
dst = core_base + UCODE_STORE;
while (*src != ~0) {
iowrite32(*src, dst);
src++;
dst += sizeof(*src);
}
wmb();
}
if (changeparameters) {
u32 reg;
/* set other mode dependent flags */
switch (mode) {
case OXNASSATA_RAID1:
/* clear JBOD mode */
reg = ioread32(core_base + DATA_PLANE_CTRL);
reg |= DPC_JBOD_UCODE;
reg &= ~DPC_FIS_SWCH;
iowrite32(reg, core_base + DATA_PLANE_CTRL);
wmb();
/* set the hardware up for RAID-1 */
iowrite32(0, core_base + RAID_WP_BOT_LOW);
iowrite32(0, core_base + RAID_WP_BOT_HIGH);
iowrite32(0xffffffff, core_base + RAID_WP_TOP_LOW);
iowrite32(0x7fffffff, core_base + RAID_WP_TOP_HIGH);
iowrite32(0, core_base + RAID_SIZE_LOW);
iowrite32(0, core_base + RAID_SIZE_HIGH);
wmb();
break;
case OXNASSATA_RAID0:
/* clear JBOD mode */
reg = ioread32(core_base + DATA_PLANE_CTRL);
reg |= DPC_JBOD_UCODE;
reg &= ~DPC_FIS_SWCH;
iowrite32(reg, core_base + DATA_PLANE_CTRL);
wmb();
/* set the hardware up for RAID-1 */
iowrite32(0, core_base + RAID_WP_BOT_LOW);
iowrite32(0, core_base + RAID_WP_BOT_HIGH);
iowrite32(0xffffffff, core_base + RAID_WP_TOP_LOW);
iowrite32(0x7fffffff, core_base + RAID_WP_TOP_HIGH);
iowrite32(0xffffffff, core_base + RAID_SIZE_LOW);
iowrite32(0x7fffffff, core_base + RAID_SIZE_HIGH);
wmb();
break;
case OXNASSATA_NOTRAID:
/* enable jbod mode */
reg = ioread32(core_base + DATA_PLANE_CTRL);
reg &= ~DPC_JBOD_UCODE;
reg &= ~DPC_FIS_SWCH;
iowrite32(reg, core_base + DATA_PLANE_CTRL);
wmb();
/* start micro-code processor*/
iowrite32(1, core_base + PROC_START);
break;
default:
reg = ioread32(core_base + DATA_PLANE_CTRL);
reg |= DPC_JBOD_UCODE;
reg &= ~DPC_FIS_SWCH;
iowrite32(reg, core_base + DATA_PLANE_CTRL);
wmb();
break;
}
}
}
/**
* sends a sync-escape if there is a link present
*/
static inline void sata_oxnas_send_sync_escape(struct ata_port *ap)
{
struct sata_oxnas_port_priv *pd = ap->private_data;
u32 reg;
/* read the SSTATUS register and only send a sync escape if there is a
* link active */
if ((sata_oxnas_link_read(ap, 0x20) & 3) == 3) {
reg = ioread32(pd->port_base + SATA_COMMAND);
reg &= ~SATA_OPCODE_MASK;
reg |= CMD_SYNC_ESCAPE;
iowrite32(reg, pd->port_base + SATA_COMMAND);
}
}
/* clears errors */
static inline void sata_oxnas_clear_CS_error(struct ata_port *ap)
{
struct sata_oxnas_port_priv *pd = ap->private_data;
u32 *base = pd->port_base;
u32 reg;
reg = ioread32(base + SATA_CONTROL);
reg &= SATA_CTL_ERR_MASK;
iowrite32(reg, base + SATA_CONTROL);
}
static inline void sata_oxnas_reset_sgdma(struct ata_port *ap)
{
struct sata_oxnas_port_priv *pd = ap->private_data;
iowrite32(SGDMA_RESETS_CTRL, pd->sgdma_base + SGDMA_RESETS);
}
static inline void sata_oxnas_reset_dma(struct ata_port *ap, int assert)
{
struct sata_oxnas_port_priv *pd = ap->private_data;
u32 reg;
reg = ioread32(pd->dmactl_base + DMA_CONTROL);
if (assert)
reg |= DMA_CONTROL_RESET;
else
reg &= ~DMA_CONTROL_RESET;
iowrite32(reg, pd->dmactl_base + DMA_CONTROL);
};
/**
* Clears the error caused by the core's registers being accessed when the
* core is busy.
*/
static inline void sata_oxnas_clear_reg_access_error(struct ata_port *ap)
{
struct sata_oxnas_port_priv *pd = ap->private_data;
u32 *base = pd->port_base;
u32 reg;
reg = ioread32(base + INT_STATUS);
DPRINTK("ENTER\n");
if (reg & INT_REG_ACCESS_ERR) {
DPRINTK("clearing register access error on port %d\n",
ap->port_no);
iowrite32(INT_REG_ACCESS_ERR, base + INT_STATUS);
}
reg = ioread32(base + INT_STATUS);
if (reg & INT_REG_ACCESS_ERR)
DPRINTK("register access error didn't clear\n");
}
static inline void sata_oxnas_clear_sctl_error(struct ata_port *ap)
{
struct sata_oxnas_port_priv *pd = ap->private_data;
u32 *base = pd->port_base;
u32 reg;
reg = ioread32(base + SATA_CONTROL);
reg |= SCTL_CLR_ERR;
iowrite32(reg, base + SATA_CONTROL);
}
static inline void sata_oxnas_clear_raid_error(struct ata_host *ah)
{
return;
};
/**
* Clean up all the state machines in the sata core.
* @return post cleanup action required
*/
static int sata_oxnas_cleanup(struct ata_host *ah)
{
struct sata_oxnas_host_priv *hd = ah->private_data;
int actions_required = 0;
int n;
printk(KERN_INFO "sata_oxnas: resetting SATA core\n");
/* core not recovering, reset it */
mdelay(5);
sata_oxnas_reset_core(ah);
mdelay(5);
actions_required |= OXNAS_SATA_REINIT;
/* Perform any SATA core re-initialisation after reset post reset init
* needs to be called for both ports as there's one reset for both
* ports */
for (n = 0; n < hd->n_ports; n++)
sata_oxnas_post_reset_init(ah->ports[n]);
return actions_required;
}
/**
* ata_qc_new - Request an available ATA command, for queueing
* @ap: Port associated with device @dev
* @return non zero will refuse a new command, zero will may grant on subject
* to conditions elsewhere.
*
*/
static int sata_oxnas_qc_new(struct ata_port *ap)
{
struct sata_oxnas_host_priv *hd = ap->host->private_data;
DPRINTK("port %d\n", ap->port_no);
smp_rmb();
if (hd->port_frozen || hd->port_in_eh)
return 1;
else
return !sata_oxnas_acquire_hw(ap, 0, 0);
}
/**
* releases the lock on the port the command used
*/
static void sata_oxnas_qc_free(struct ata_queued_cmd *qc)
{
DPRINTK("\n");
sata_oxnas_release_hw(qc->ap);
}
static void sata_oxnas_freeze(struct ata_port *ap)
{
struct sata_oxnas_host_priv *hd = ap->host->private_data;
DPRINTK("\n");
hd->port_frozen |= BIT(ap->port_no);
smp_wmb();
}
static void sata_oxnas_thaw(struct ata_port *ap)
{
struct sata_oxnas_host_priv *hd = ap->host->private_data;
DPRINTK("\n");
hd->port_frozen &= ~BIT(ap->port_no);
smp_wmb();
}
void sata_oxnas_freeze_host(struct ata_port *ap)
{
struct sata_oxnas_host_priv *hd = ap->host->private_data;
DPRINTK("ENTER\n");
hd->port_in_eh |= BIT(ap->port_no);
smp_wmb();
}
void sata_oxnas_thaw_host(struct ata_port *ap)
{
struct sata_oxnas_host_priv *hd = ap->host->private_data;
DPRINTK("ENTER\n");
hd->port_in_eh &= ~BIT(ap->port_no);
smp_wmb();
}
static void sata_oxnas_post_internal_cmd(struct ata_queued_cmd *qc)
{
DPRINTK("ENTER\n");
/* If the core is busy here, make it idle */
if (qc->flags & ATA_QCFLAG_FAILED)
sata_oxnas_cleanup(qc->ap->host);
}
/**
* turn on the interrupts
*
* @param ap Hardware with the registers in
*/
static void sata_oxnas_irq_on(struct ata_port *ap)
{
struct sata_oxnas_port_priv *pd = ap->private_data;
u32 mask = (COREINT_END << ap->port_no);
/* Clear pending interrupts */
iowrite32(~0, pd->port_base + INT_CLEAR);
iowrite32(mask, pd->core_base + CORE_INT_STATUS);
wmb();
/* enable End of command interrupt */
iowrite32(INT_WANT, pd->port_base + INT_ENABLE);
iowrite32(mask, pd->core_base + CORE_INT_ENABLE);
}
/** @return true if the port has a cable connected */
int sata_oxnas_check_link(struct ata_port *ap)
{
int reg;
sata_oxnas_scr_read_port(ap, SCR_STATUS, &reg);
/* Check for the cable present indicated by SCR status bit-0 set */
return reg & 0x1;
}
/**
* ata_std_postreset - standard postreset callback
* @link: the target ata_link
* @classes: classes of attached devices
*
* This function is invoked after a successful reset. Note that
* the device might have been reset more than once using
* different reset methods before postreset is invoked.
*
* LOCKING:
* Kernel thread context (may sleep)
*/
static void sata_oxnas_postreset(struct ata_link *link, unsigned int *classes)
{
struct ata_port *ap = link->ap;
struct sata_oxnas_host_priv *hd = ap->host->private_data;
unsigned int dev;
DPRINTK("ENTER\n");
ata_std_postreset(link, classes);
/* turn on phy error detection by removing the masks */
sata_oxnas_link_write(ap->host->ports[0], 0x0c, 0x30003);
if (hd->n_ports > 1)
sata_oxnas_link_write(ap->host->ports[1], 0x0c, 0x30003);
/* bail out if no device is present */
if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
DPRINTK("EXIT, no device\n");
return;
}
/* go through all the devices and configure them */
for (dev = 0; dev < ATA_MAX_DEVICES; ++dev) {
if (ap->link.device[dev].class == ATA_DEV_ATA)
sata_oxnas_dev_config(&(ap->link.device[dev]));
}
DPRINTK("EXIT\n");
}
/**
* Called to read the hardware registers / DMA buffers, to
* obtain the current set of taskfile register values.
* @param ap hardware with the registers in
* @param tf taskfile to read the registers into
*/
static void sata_oxnas_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
{
struct sata_oxnas_port_priv *port_priv = ap->private_data;
void __iomem *port_base = port_priv->port_base;
/* read the orb registers */
u32 Orb1 = ioread32(port_base + ORB1);
u32 Orb2 = ioread32(port_base + ORB2);
u32 Orb3 = ioread32(port_base + ORB3);
u32 Orb4 = ioread32(port_base + ORB4);
/* read common 28/48 bit tf parameters */
tf->device = (Orb1 >> 24);
tf->nsect = (Orb2 >> 0);
tf->feature = (Orb2 >> 16);
tf->command = sata_oxnas_check_status(ap);
/* read 48 or 28 bit tf parameters */
if (tf->flags & ATA_TFLAG_LBA48) {
tf->hob_nsect = (Orb2 >> 8);
tf->lbal = (Orb3 >> 0);
tf->lbam = (Orb3 >> 8);
tf->lbah = (Orb3 >> 16);
tf->hob_lbal = (Orb3 >> 24);
tf->hob_lbam = (Orb4 >> 0);
tf->hob_lbah = (Orb4 >> 8);
/* feature ext and control are write only */
} else {
/* read 28-bit lba */
tf->lbal = (Orb3 >> 0);
tf->lbam = (Orb3 >> 8);
tf->lbah = (Orb3 >> 16);
}
}
/**
* Read a result task-file from the sata core registers.
*/
static bool sata_oxnas_qc_fill_rtf(struct ata_queued_cmd *qc)
{
/* Read the most recently received FIS from the SATA core ORB registers
and convert to an ATA taskfile */
sata_oxnas_tf_read(qc->ap, &qc->result_tf);
return true;
}
/**
* Reads the Status ATA shadow register from hardware.
*
* @return The status register
*/
static u8 sata_oxnas_check_status(struct ata_port *ap)
{
u32 Reg;
u8 status;
struct sata_oxnas_port_priv *port_priv = ap->private_data;
void __iomem *port_base = port_priv->port_base;
/* read byte 3 of Orb2 register */
status = ioread32(port_base + ORB2) >> 24;
/* check for the drive going missing indicated by SCR status bits
* 0-3 = 0 */
sata_oxnas_scr_read_port(ap, SCR_STATUS, &Reg);
if (!(Reg & 0x1)) {
status |= ATA_DF;
status |= ATA_ERR;
}
return status;
}
static inline void sata_oxnas_reset_ucode(struct ata_host *ah, int force,
int no_microcode)
{
struct sata_oxnas_host_priv *hd = ah->private_data;
DPRINTK("ENTER\n");
if (no_microcode) {
u32 reg;
sata_oxnas_set_mode(ah, UNKNOWN_MODE, force);
reg = ioread32(hd->core_base + DEVICE_CONTROL);
reg |= DEVICE_CONTROL_ATA_ERR_OVERRIDE;
iowrite32(reg, hd->core_base + DEVICE_CONTROL);
} else {
/* JBOD uCode */
sata_oxnas_set_mode(ah, OXNASSATA_NOTRAID, force);
/* Turn the work around off as it may have been left on by any
* HW-RAID code that we've been working with */
iowrite32(0x0, hd->core_base + PORT_ERROR_MASK);
}
}
/**
* Prepare as much as possible for a command without involving anything that is
* shared between ports.
*/
static void sata_oxnas_qc_prep(struct ata_queued_cmd *qc)
{
struct sata_oxnas_port_priv *pd;
int port_no = qc->ap->port_no;
/* if the port's not connected, complete now with an error */
if (!sata_oxnas_check_link(qc->ap)) {
ata_port_err(qc->ap,
"port %d not connected completing with error\n",
port_no);
qc->err_mask |= AC_ERR_ATA_BUS;
ata_qc_complete(qc);
}
sata_oxnas_reset_ucode(qc->ap->host, 0, 0);
/* both pio and dma commands use dma */
if (ata_is_dma(qc->tf.protocol) || ata_is_pio(qc->tf.protocol)) {
/* program the scatterlist into the prd table */
ata_bmdma_qc_prep(qc);
/* point the sgdma controller at the dma request structure */
pd = qc->ap->private_data;
iowrite32(pd->sgdma_request_pa,
pd->sgdma_base + SGDMA_REQUESTPTR);
/* setup the request table */
if (port_no == 0) {
pd->sgdma_request->control =
(qc->dma_dir == DMA_FROM_DEVICE) ?
SGDMA_REQCTL0IN : SGDMA_REQCTL0OUT;
} else {
pd->sgdma_request->control =
(qc->dma_dir == DMA_FROM_DEVICE) ?
SGDMA_REQCTL1IN : SGDMA_REQCTL1OUT;
}
pd->sgdma_request->qualifier = SGDMA_REQQUAL;
pd->sgdma_request->src_pa = qc->ap->bmdma_prd_dma;
pd->sgdma_request->dst_pa = qc->ap->bmdma_prd_dma;
smp_wmb();
/* tell it to wait */
iowrite32(SGDMA_CONTROL_NOGO, pd->sgdma_base + SGDMA_CONTROL);
}
}
static int sata_oxnas_port_start(struct ata_port *ap)
{
struct sata_oxnas_host_priv *host_priv = ap->host->private_data;
struct device *dev = ap->host->dev;
struct sata_oxnas_port_priv *pp;
void *mem;
dma_addr_t mem_dma;
DPRINTK("ENTER\n");
pp = kzalloc(sizeof(*pp), GFP_KERNEL);
if (!pp)
return -ENOMEM;
pp->port_base = host_priv->port_base +
(ap->port_no ? PORT_SIZE : 0);
pp->dmactl_base = host_priv->dmactl_base +
(ap->port_no ? DMA_CORESIZE : 0);
pp->sgdma_base = host_priv->sgdma_base +
(ap->port_no ? SGDMA_CORESIZE : 0);
pp->core_base = host_priv->core_base;
/* preallocated */
if (host_priv->dma_size >= SATA_OXNAS_DMA_SIZE * host_priv->n_ports) {
DPRINTK("using preallocated DMA\n");
mem_dma = host_priv->dma_base +
(ap->port_no ? SATA_OXNAS_DMA_SIZE : 0);
mem = ioremap(mem_dma, SATA_OXNAS_DMA_SIZE);
} else {
mem = dma_alloc_coherent(dev, SATA_OXNAS_DMA_SIZE, &mem_dma,
GFP_KERNEL);
}
if (!mem)
goto err_ret;
pp->sgdma_request_pa = mem_dma;
pp->sgdma_request = mem;
ap->bmdma_prd_dma = mem_dma + sizeof(struct sgdma_request);
ap->bmdma_prd = mem + sizeof(struct sgdma_request);
ap->private_data = pp;
sata_oxnas_post_reset_init(ap);
return 0;
err_ret:
kfree(pp);
return -ENOMEM;
}
static void sata_oxnas_port_stop(struct ata_port *ap)
{
struct device *dev = ap->host->dev;
struct sata_oxnas_port_priv *pp = ap->private_data;
struct sata_oxnas_host_priv *host_priv = ap->host->private_data;
DPRINTK("ENTER\n");
ap->private_data = NULL;
if (host_priv->dma_size) {
iounmap(pp->sgdma_request);
} else {
dma_free_coherent(dev, SATA_OXNAS_DMA_SIZE,
pp->sgdma_request, pp->sgdma_request_pa);
}
kfree(pp);
}
static void sata_oxnas_post_reset_init(struct ata_port *ap)
{
uint dev;
/* force to load u-code only once after reset */
sata_oxnas_reset_ucode(ap->host, !ap->port_no, 0);
/* turn on phy error detection by removing the masks */
sata_oxnas_link_write(ap, 0x0C, 0x30003);
/* enable hotplug event detection */
sata_oxnas_scr_write_port(ap, SCR_ERROR, ~0);
sata_oxnas_scr_write_port(ap, SERROR_IRQ_MASK, 0x03feffff);
sata_oxnas_scr_write_port(ap, SCR_ACTIVE, ~0 & ~(1 << 26) & ~(1 << 16));
/* enable interrupts for ports */
sata_oxnas_irq_on(ap);
/* go through all the devices and configure them */
for (dev = 0; dev < ATA_MAX_DEVICES; ++dev) {
if (ap->link.device[dev].class == ATA_DEV_ATA) {
sata_std_hardreset(&ap->link, NULL, jiffies + HZ);
sata_oxnas_dev_config(&(ap->link.device[dev]));
}
}
/* clean up any remaining errors */
sata_oxnas_scr_write_port(ap, SCR_ERROR, ~0);
VPRINTK("done\n");
}
/**
* host_stop() is called when the rmmod or hot unplug process begins. The
* hook must stop all hardware interrupts, DMA engines, etc.
*
* @param ap hardware with the registers in
*/
static void sata_oxnas_host_stop(struct ata_host *host_set)
{
DPRINTK("\n");
}
#define ERROR_HW_ACQUIRE_TIMEOUT_JIFFIES (10 * HZ)
static void sata_oxnas_error_handler(struct ata_port *ap)
{
DPRINTK("Enter port_no %d\n", ap->port_no);
sata_oxnas_freeze_host(ap);
/* If the core is busy here, make it idle */
sata_oxnas_cleanup(ap->host);
ata_std_error_handler(ap);
sata_oxnas_thaw_host(ap);
}
static int sata_oxnas_softreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
struct ata_port *ap = link->ap;
struct sata_oxnas_port_priv *pd = ap->private_data;
void __iomem *port_base = pd->port_base;
int rc;
struct ata_taskfile tf;
u32 Command_Reg;
DPRINTK("ENTER\n");
port_base = pd->port_base;
if (ata_link_offline(link)) {
DPRINTK("PHY reports no device\n");
*class = ATA_DEV_NONE;
goto out;
}
/* write value to register */
iowrite32(0, port_base + ORB1);
iowrite32(0, port_base + ORB2);
iowrite32(0, port_base + ORB3);
iowrite32((ap->ctl) << 24, port_base + ORB4);
/* command the core to send a control FIS */
Command_Reg = ioread32(port_base + SATA_COMMAND);
Command_Reg &= ~SATA_OPCODE_MASK;
Command_Reg |= CMD_WRITE_TO_ORB_REGS_NO_COMMAND;
iowrite32(Command_Reg, port_base + SATA_COMMAND);
udelay(20); /* FIXME: flush */
/* write value to register */
iowrite32((ap->ctl | ATA_SRST) << 24, port_base + ORB4);
/* command the core to send a control FIS */
Command_Reg &= ~SATA_OPCODE_MASK;
Command_Reg |= CMD_WRITE_TO_ORB_REGS_NO_COMMAND;
iowrite32(Command_Reg, port_base + SATA_COMMAND);
udelay(20); /* FIXME: flush */
/* write value to register */
iowrite32((ap->ctl) << 24, port_base + ORB4);
/* command the core to send a control FIS */
Command_Reg &= ~SATA_OPCODE_MASK;
Command_Reg |= CMD_WRITE_TO_ORB_REGS_NO_COMMAND;
iowrite32(Command_Reg, port_base + SATA_COMMAND);
msleep(150);
rc = ata_sff_wait_ready(link, deadline);
/* if link is occupied, -ENODEV too is an error */
if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
ata_link_printk(link, KERN_ERR, "SRST failed (errno=%d)\n", rc);
return rc;
}
/* determine by signature whether we have ATA or ATAPI devices */
sata_oxnas_tf_read(ap, &tf);
*class = ata_dev_classify(&tf);
if (*class == ATA_DEV_UNKNOWN)
*class = ATA_DEV_NONE;
out:
DPRINTK("EXIT, class=%u\n", *class);
return 0;
}
int sata_oxnas_init_controller(struct ata_host *host)
{
return 0;
}
/**
* Ref bug-6320
*
* This code is a work around for a DMA hardware bug that will repeat the
* penultimate 8-bytes on some reads. This code will check that the amount
* of data transferred is a multiple of 512 bytes, if not the in it will
* fetch the correct data from a buffer in the SATA core and copy it into
* memory.
*
* @param port SATA port to check and if necessary, correct.
*/
static int sata_oxnas_bug_6320_detect(struct ata_port *ap)
{
struct sata_oxnas_port_priv *pd = ap->private_data;
void __iomem *core_base = pd->core_base;
int is_read;
int quads_transferred;
int remainder;
int sector_quads_remaining;
int bug_present = 0;
/* Only want to apply fix to reads */
is_read = !(ioread32(core_base + DM_DBG1) & (ap->port_no ?
BIT(CORE_PORT1_DATA_DIR_BIT) :
BIT(CORE_PORT0_DATA_DIR_BIT)));
/* Check for an incomplete transfer, i.e. not a multiple of 512 bytes
transferred (datacount_port register counts quads transferred) */
quads_transferred =
ioread32(core_base + (ap->port_no ?
DATACOUNT_PORT1 : DATACOUNT_PORT0));
remainder = quads_transferred & 0x7f;
sector_quads_remaining = remainder ? (0x80 - remainder) : 0;
if (is_read && (sector_quads_remaining == 2)) {
bug_present = 1;
} else if (sector_quads_remaining) {
if (is_read) {
ata_port_warn(ap, "SATA read fixup cannot deal with "
"%d quads remaining\n",
sector_quads_remaining);
} else {
ata_port_warn(ap, "SATA write fixup of %d quads "
"remaining not supported\n",
sector_quads_remaining);
}
}
return bug_present;
}
/* This port done an interrupt */
static void sata_oxnas_port_irq(struct ata_port *ap, int force_error)
{
struct ata_queued_cmd *qc;
struct sata_oxnas_port_priv *pd = ap->private_data;
void __iomem *port_base = pd->port_base;
u32 int_status;
unsigned long flags = 0;
DPRINTK("ENTER port %d irqstatus %x\n", ap->port_no,
ioread32(port_base + INT_STATUS));
if (ap->qc_active & (1 << ATA_TAG_INTERNAL)) {
qc = ata_qc_from_tag(ap, ATA_TAG_INTERNAL);
DPRINTK("completing non-ncq cmd\n");
if (qc)
ata_qc_complete(qc);
return;
}
qc = ata_qc_from_tag(ap, ap->link.active_tag);
/* record the port's interrupt */
int_status = ioread32(port_base + INT_STATUS);
/* If there's no command associated with this IRQ, ignore it. We may get
* spurious interrupts when cleaning-up after a failed command, ignore
* these too. */
if (likely(qc)) {
/* get the status before any error cleanup */
qc->err_mask = ac_err_mask(sata_oxnas_check_status(ap));
if (force_error) {
/* Pretend there has been a link error */
qc->err_mask |= AC_ERR_ATA_BUS;
DPRINTK(" ####force error####\n");
}
/* tell libata we're done */
local_irq_save(flags);
sata_oxnas_irq_clear(ap);
local_irq_restore(flags);
ata_qc_complete(qc);
} else {
VPRINTK("Ignoring interrupt, can't find the command tag="
"%d %08x\n", ap->link.active_tag, ap->qc_active);
}
/* maybe a hotplug event */
if (unlikely(int_status & INT_LINK_SERROR)) {
u32 serror;
sata_oxnas_scr_read_port(ap, SCR_ERROR, &serror);
if (serror & (SERR_DEV_XCHG | SERR_PHYRDY_CHG)) {
ata_ehi_hotplugged(&ap->link.eh_info);
ata_port_freeze(ap);
}
}
}
/**
* irq_handler is the interrupt handling routine registered with the system,
* by libata.
*/
static irqreturn_t sata_oxnas_interrupt(int irq, void *dev_instance)
{
struct ata_host *ah = dev_instance;
struct sata_oxnas_host_priv *hd = ah->private_data;
void __iomem *core_base = hd->core_base;
u32 int_status;
irqreturn_t ret = IRQ_NONE;
u32 port_no;
u32 mask;
int bug_present;
/* loop until there are no more interrupts */
while ((int_status = (ioread32(core_base + CORE_INT_STATUS)) &
(COREINT_END | (COREINT_END << 1)))) {
/* clear any interrupt */
iowrite32(int_status, core_base + CORE_INT_CLEAR);
/* Only need workaround_bug_6320 for single disk systems as dual
* disk will use uCode which prevents this read underrun problem
* from occurring.
* All single disk systems will use port 0 */
for (port_no = 0; port_no < hd->n_ports; ++port_no) {
/* check the raw end of command interrupt to see if the
* port is done */
mask = (COREINT_END << port_no);
if (!(int_status & mask))
continue;
/* this port had an interrupt, clear it */
iowrite32(mask, core_base + CORE_INT_CLEAR);
/* check for bug 6320 only if no microcode was loaded */
bug_present = (hd->current_ucode == UNKNOWN_MODE) &&
sata_oxnas_bug_6320_detect(ah->ports[port_no]);
sata_oxnas_port_irq(ah->ports[port_no],
bug_present);
ret = IRQ_HANDLED;
}
}
return ret;
}
/*
* scsi mid-layer and libata interface structures
*/
static struct scsi_host_template sata_oxnas_sht = {
ATA_NCQ_SHT("sata_oxnas"),
.can_queue = SATA_OXNAS_QUEUE_DEPTH,
.sg_tablesize = SATA_OXNAS_MAX_PRD,
.dma_boundary = ATA_DMA_BOUNDARY,
.unchecked_isa_dma = 0,
};
static struct ata_port_operations sata_oxnas_ops = {
.inherits = &sata_port_ops,
.qc_prep = sata_oxnas_qc_prep,
.qc_issue = sata_oxnas_qc_issue,
.qc_fill_rtf = sata_oxnas_qc_fill_rtf,
.qc_new = sata_oxnas_qc_new,
.qc_free = sata_oxnas_qc_free,
.scr_read = sata_oxnas_scr_read,
.scr_write = sata_oxnas_scr_write,
.freeze = sata_oxnas_freeze,
.thaw = sata_oxnas_thaw,
.softreset = sata_oxnas_softreset,
/* .hardreset = sata_oxnas_hardreset, */
.postreset = sata_oxnas_postreset,
.error_handler = sata_oxnas_error_handler,
.post_internal_cmd = sata_oxnas_post_internal_cmd,
.port_start = sata_oxnas_port_start,
.port_stop = sata_oxnas_port_stop,
.host_stop = sata_oxnas_host_stop,
/* .pmp_attach = sata_oxnas_pmp_attach, */
/* .pmp_detach = sata_oxnas_pmp_detach, */
.sff_check_status = sata_oxnas_check_status,
.acquire_hw = sata_oxnas_acquire_hw,
};
static const struct ata_port_info sata_oxnas_port_info = {
.flags = SATA_OXNAS_HOST_FLAGS,
.pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &sata_oxnas_ops,
};
static int sata_oxnas_probe(struct platform_device *ofdev)
{
int retval = -ENXIO;
int n_ports = 0;
void __iomem *port_base = NULL;
void __iomem *dmactl_base = NULL;
void __iomem *sgdma_base = NULL;
void __iomem *core_base = NULL;
void __iomem *phy_base = NULL;
struct reset_control *rstc;
struct resource res = {};
struct sata_oxnas_host_priv *host_priv = NULL;
int irq = 0;
struct ata_host *host = NULL;
struct clk *clk = NULL;
const struct ata_port_info *ppi[] = { &sata_oxnas_port_info, NULL };
of_property_read_u32(ofdev->dev.of_node, "nr-ports", &n_ports);
if (n_ports < 1 || n_ports > SATA_OXNAS_MAX_PORTS)
goto error_exit_with_cleanup;
port_base = of_iomap(ofdev->dev.of_node, 0);
if (!port_base)
goto error_exit_with_cleanup;
dmactl_base = of_iomap(ofdev->dev.of_node, 1);
if (!dmactl_base)
goto error_exit_with_cleanup;
sgdma_base = of_iomap(ofdev->dev.of_node, 2);
if (!sgdma_base)
goto error_exit_with_cleanup;
core_base = of_iomap(ofdev->dev.of_node, 3);
if (!core_base)
goto error_exit_with_cleanup;
phy_base = of_iomap(ofdev->dev.of_node, 4);
if (!phy_base)
goto error_exit_with_cleanup;
host_priv = devm_kzalloc(&ofdev->dev,
sizeof(struct sata_oxnas_host_priv),
GFP_KERNEL);
if (!host_priv)
goto error_exit_with_cleanup;
host_priv->port_base = port_base;
host_priv->dmactl_base = dmactl_base;
host_priv->sgdma_base = sgdma_base;
host_priv->core_base = core_base;
host_priv->phy_base = phy_base;
host_priv->n_ports = n_ports;
host_priv->current_ucode = UNKNOWN_MODE;
if (!of_address_to_resource(ofdev->dev.of_node, 5, &res)) {
host_priv->dma_base = res.start;
host_priv->dma_size = resource_size(&res);
}
irq = irq_of_parse_and_map(ofdev->dev.of_node, 0);
if (!irq) {
dev_err(&ofdev->dev, "invalid irq from platform\n");
goto error_exit_with_cleanup;
}
host_priv->irq = irq;
clk = of_clk_get(ofdev->dev.of_node, 0);
if (IS_ERR(clk)) {
retval = PTR_ERR(clk);
clk = NULL;
goto error_exit_with_cleanup;
}
host_priv->clk = clk;
rstc = devm_reset_control_get(&ofdev->dev, "sata");
if (IS_ERR(rstc)) {
retval = PTR_ERR(rstc);
goto error_exit_with_cleanup;
}
host_priv->rst_sata = rstc;
rstc = devm_reset_control_get(&ofdev->dev, "link");
if (IS_ERR(rstc)) {
retval = PTR_ERR(rstc);
goto error_exit_with_cleanup;
}
host_priv->rst_link = rstc;
rstc = devm_reset_control_get(&ofdev->dev, "phy");
if (IS_ERR(rstc)) {
retval = PTR_ERR(rstc);
goto error_exit_with_cleanup;
}
host_priv->rst_phy = rstc;
/* allocate host structure */
host = ata_host_alloc_pinfo(&ofdev->dev, ppi, n_ports);
if (!host) {
retval = -ENOMEM;
goto error_exit_with_cleanup;
}
host->private_data = host_priv;
host->iomap = port_base;
/* initialize core locking and queues */
init_waitqueue_head(&host_priv->fast_wait_queue);
init_waitqueue_head(&host_priv->scsi_wait_queue);
spin_lock_init(&host_priv->phy_lock);
spin_lock_init(&host_priv->core_lock);
host_priv->core_locked = 0;
host_priv->reentrant_port_no = -1;
host_priv->hw_lock_count = 0;
host_priv->direct_lock_count = 0;
host_priv->locker_uid = 0;
host_priv->current_locker_type = SATA_UNLOCKED;
host_priv->isr_arg = NULL;
host_priv->isr_callback = NULL;
/* initialize host controller */
retval = sata_oxnas_init_controller(host);
if (retval)
goto error_exit_with_cleanup;
/*
* Now, register with libATA core, this will also initiate the
* device discovery process, invoking our port_start() handler &
* error_handler() to execute a dummy softreset EH session
*/
ata_host_activate(host, irq, sata_oxnas_interrupt, SATA_OXNAS_IRQ_FLAG,
&sata_oxnas_sht);
return 0;
error_exit_with_cleanup:
if (irq)
irq_dispose_mapping(host_priv->irq);
if (clk)
clk_put(clk);
if (host)
ata_host_detach(host);
if (port_base)
iounmap(port_base);
if (sgdma_base)
iounmap(sgdma_base);
if (core_base)
iounmap(core_base);
if (phy_base)
iounmap(phy_base);
return retval;
}
static int sata_oxnas_remove(struct platform_device *ofdev)
{
struct ata_host *host = dev_get_drvdata(&ofdev->dev);
struct sata_oxnas_host_priv *host_priv = host->private_data;
ata_host_detach(host);
irq_dispose_mapping(host_priv->irq);
iounmap(host_priv->port_base);
iounmap(host_priv->sgdma_base);
iounmap(host_priv->core_base);
/* reset Controller, Link and PHY */
reset_control_assert(host_priv->rst_sata);
reset_control_assert(host_priv->rst_link);
reset_control_assert(host_priv->rst_phy);
/* Disable the clock to the SATA block */
clk_disable_unprepare(host_priv->clk);
clk_put(host_priv->clk);
return 0;
}
#ifdef CONFIG_PM
static int sata_oxnas_suspend(struct platform_device *op, pm_message_t state)
{
struct ata_host *host = dev_get_drvdata(&op->dev);
return ata_host_suspend(host, state);
}
static int sata_oxnas_resume(struct platform_device *op)
{
struct ata_host *host = dev_get_drvdata(&op->dev);
int ret;
ret = sata_oxnas_init_controller(host);
if (ret) {
dev_err(&op->dev, "Error initializing hardware\n");
return ret;
}
ata_host_resume(host);
return 0;
}
#endif
static struct of_device_id oxnas_sata_match[] = {
{
.compatible = "plxtech,nas782x-sata",
},
{},
};
MODULE_DEVICE_TABLE(of, oxnas_sata_match);
static struct platform_driver oxnas_sata_driver = {
.driver = {
.name = "oxnas-sata",
.owner = THIS_MODULE,
.of_match_table = oxnas_sata_match,
},
.probe = sata_oxnas_probe,
.remove = sata_oxnas_remove,
#ifdef CONFIG_PM
.suspend = sata_oxnas_suspend,
.resume = sata_oxnas_resume,
#endif
};
module_platform_driver(oxnas_sata_driver);
MODULE_LICENSE("GPL");
MODULE_VERSION("1.0");
MODULE_AUTHOR("Oxford Semiconductor Ltd.");
MODULE_DESCRIPTION("low-level driver for Oxford 934 SATA core");
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