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linux/drivers/ata/sata_fsl.c
James Bottomley 37198e3051 libata: kill now unused n_iter and fix sata_fsl 
qc->n_iter was used for libata's own sg walking before sg chaining
replaced it.  During conversion, the field and its usage in sata_fsl
were left behind.  Kill the filed and update sata_fsl.

tj: This was part of James's libata-use-block-layer-padding patch.
    Separated out by me.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Li Yang <leoli@freescale.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2008-02-06 06:59:32 -05:00

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/*
* drivers/ata/sata_fsl.c
*
* Freescale 3.0Gbps SATA device driver
*
* Author: Ashish Kalra <ashish.kalra@freescale.com>
* Li Yang <leoli@freescale.com>
*
* Copyright (c) 2006-2007 Freescale Semiconductor, Inc.
*
* 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.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <linux/libata.h>
#include <asm/io.h>
#include <linux/of_platform.h>
/* Controller information */
enum {
SATA_FSL_QUEUE_DEPTH = 16,
SATA_FSL_MAX_PRD = 63,
SATA_FSL_MAX_PRD_USABLE = SATA_FSL_MAX_PRD - 1,
SATA_FSL_MAX_PRD_DIRECT = 16, /* Direct PRDT entries */
SATA_FSL_HOST_FLAGS = (ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
ATA_FLAG_NCQ),
SATA_FSL_HOST_LFLAGS = ATA_LFLAG_SKIP_D2H_BSY,
SATA_FSL_MAX_CMDS = SATA_FSL_QUEUE_DEPTH,
SATA_FSL_CMD_HDR_SIZE = 16, /* 4 DWORDS */
SATA_FSL_CMD_SLOT_SIZE = (SATA_FSL_MAX_CMDS * SATA_FSL_CMD_HDR_SIZE),
/*
* SATA-FSL host controller supports a max. of (15+1) direct PRDEs, and
* chained indirect PRDEs upto a max count of 63.
* We are allocating an array of 63 PRDEs contigiously, but PRDE#15 will
* be setup as an indirect descriptor, pointing to it's next
* (contigious) PRDE. Though chained indirect PRDE arrays are
* supported,it will be more efficient to use a direct PRDT and
* a single chain/link to indirect PRDE array/PRDT.
*/
SATA_FSL_CMD_DESC_CFIS_SZ = 32,
SATA_FSL_CMD_DESC_SFIS_SZ = 32,
SATA_FSL_CMD_DESC_ACMD_SZ = 16,
SATA_FSL_CMD_DESC_RSRVD = 16,
SATA_FSL_CMD_DESC_SIZE = (SATA_FSL_CMD_DESC_CFIS_SZ +
SATA_FSL_CMD_DESC_SFIS_SZ +
SATA_FSL_CMD_DESC_ACMD_SZ +
SATA_FSL_CMD_DESC_RSRVD +
SATA_FSL_MAX_PRD * 16),
SATA_FSL_CMD_DESC_OFFSET_TO_PRDT =
(SATA_FSL_CMD_DESC_CFIS_SZ +
SATA_FSL_CMD_DESC_SFIS_SZ +
SATA_FSL_CMD_DESC_ACMD_SZ +
SATA_FSL_CMD_DESC_RSRVD),
SATA_FSL_CMD_DESC_AR_SZ = (SATA_FSL_CMD_DESC_SIZE * SATA_FSL_MAX_CMDS),
SATA_FSL_PORT_PRIV_DMA_SZ = (SATA_FSL_CMD_SLOT_SIZE +
SATA_FSL_CMD_DESC_AR_SZ),
/*
* MPC8315 has two SATA controllers, SATA1 & SATA2
* (one port per controller)
* MPC837x has 2/4 controllers, one port per controller
*/
SATA_FSL_MAX_PORTS = 1,
SATA_FSL_IRQ_FLAG = IRQF_SHARED,
};
/*
* Host Controller command register set - per port
*/
enum {
CQ = 0,
CA = 8,
CC = 0x10,
CE = 0x18,
DE = 0x20,
CHBA = 0x24,
HSTATUS = 0x28,
HCONTROL = 0x2C,
CQPMP = 0x30,
SIGNATURE = 0x34,
ICC = 0x38,
/*
* Host Status Register (HStatus) bitdefs
*/
ONLINE = (1 << 31),
GOING_OFFLINE = (1 << 30),
BIST_ERR = (1 << 29),
FATAL_ERR_HC_MASTER_ERR = (1 << 18),
FATAL_ERR_PARITY_ERR_TX = (1 << 17),
FATAL_ERR_PARITY_ERR_RX = (1 << 16),
FATAL_ERR_DATA_UNDERRUN = (1 << 13),
FATAL_ERR_DATA_OVERRUN = (1 << 12),
FATAL_ERR_CRC_ERR_TX = (1 << 11),
FATAL_ERR_CRC_ERR_RX = (1 << 10),
FATAL_ERR_FIFO_OVRFL_TX = (1 << 9),
FATAL_ERR_FIFO_OVRFL_RX = (1 << 8),
FATAL_ERROR_DECODE = FATAL_ERR_HC_MASTER_ERR |
FATAL_ERR_PARITY_ERR_TX |
FATAL_ERR_PARITY_ERR_RX |
FATAL_ERR_DATA_UNDERRUN |
FATAL_ERR_DATA_OVERRUN |
FATAL_ERR_CRC_ERR_TX |
FATAL_ERR_CRC_ERR_RX |
FATAL_ERR_FIFO_OVRFL_TX | FATAL_ERR_FIFO_OVRFL_RX,
INT_ON_FATAL_ERR = (1 << 5),
INT_ON_PHYRDY_CHG = (1 << 4),
INT_ON_SIGNATURE_UPDATE = (1 << 3),
INT_ON_SNOTIFY_UPDATE = (1 << 2),
INT_ON_SINGL_DEVICE_ERR = (1 << 1),
INT_ON_CMD_COMPLETE = 1,
INT_ON_ERROR = INT_ON_FATAL_ERR |
INT_ON_PHYRDY_CHG | INT_ON_SINGL_DEVICE_ERR,
/*
* Host Control Register (HControl) bitdefs
*/
HCONTROL_ONLINE_PHY_RST = (1 << 31),
HCONTROL_FORCE_OFFLINE = (1 << 30),
HCONTROL_PARITY_PROT_MOD = (1 << 14),
HCONTROL_DPATH_PARITY = (1 << 12),
HCONTROL_SNOOP_ENABLE = (1 << 10),
HCONTROL_PMP_ATTACHED = (1 << 9),
HCONTROL_COPYOUT_STATFIS = (1 << 8),
IE_ON_FATAL_ERR = (1 << 5),
IE_ON_PHYRDY_CHG = (1 << 4),
IE_ON_SIGNATURE_UPDATE = (1 << 3),
IE_ON_SNOTIFY_UPDATE = (1 << 2),
IE_ON_SINGL_DEVICE_ERR = (1 << 1),
IE_ON_CMD_COMPLETE = 1,
DEFAULT_PORT_IRQ_ENABLE_MASK = IE_ON_FATAL_ERR | IE_ON_PHYRDY_CHG |
IE_ON_SIGNATURE_UPDATE |
IE_ON_SINGL_DEVICE_ERR | IE_ON_CMD_COMPLETE,
EXT_INDIRECT_SEG_PRD_FLAG = (1 << 31),
DATA_SNOOP_ENABLE = (1 << 22),
};
/*
* SATA Superset Registers
*/
enum {
SSTATUS = 0,
SERROR = 4,
SCONTROL = 8,
SNOTIFY = 0xC,
};
/*
* Control Status Register Set
*/
enum {
TRANSCFG = 0,
TRANSSTATUS = 4,
LINKCFG = 8,
LINKCFG1 = 0xC,
LINKCFG2 = 0x10,
LINKSTATUS = 0x14,
LINKSTATUS1 = 0x18,
PHYCTRLCFG = 0x1C,
COMMANDSTAT = 0x20,
};
/* PHY (link-layer) configuration control */
enum {
PHY_BIST_ENABLE = 0x01,
};
/*
* Command Header Table entry, i.e, command slot
* 4 Dwords per command slot, command header size == 64 Dwords.
*/
struct cmdhdr_tbl_entry {
u32 cda;
u32 prde_fis_len;
u32 ttl;
u32 desc_info;
};
/*
* Description information bitdefs
*/
enum {
VENDOR_SPECIFIC_BIST = (1 << 10),
CMD_DESC_SNOOP_ENABLE = (1 << 9),
FPDMA_QUEUED_CMD = (1 << 8),
SRST_CMD = (1 << 7),
BIST = (1 << 6),
ATAPI_CMD = (1 << 5),
};
/*
* Command Descriptor
*/
struct command_desc {
u8 cfis[8 * 4];
u8 sfis[8 * 4];
u8 acmd[4 * 4];
u8 fill[4 * 4];
u32 prdt[SATA_FSL_MAX_PRD_DIRECT * 4];
u32 prdt_indirect[(SATA_FSL_MAX_PRD - SATA_FSL_MAX_PRD_DIRECT) * 4];
};
/*
* Physical region table descriptor(PRD)
*/
struct prde {
u32 dba;
u8 fill[2 * 4];
u32 ddc_and_ext;
};
/*
* ata_port private data
* This is our per-port instance data.
*/
struct sata_fsl_port_priv {
struct cmdhdr_tbl_entry *cmdslot;
dma_addr_t cmdslot_paddr;
struct command_desc *cmdentry;
dma_addr_t cmdentry_paddr;
/*
* SATA FSL controller has a Status FIS which should contain the
* received D2H FIS & taskfile registers. This SFIS is present in
* the command descriptor, and to have a ready reference to it,
* we are caching it here, quite similar to what is done in H/W on
* AHCI compliant devices by copying taskfile fields to a 32-bit
* register.
*/
struct ata_taskfile tf;
};
/*
* ata_port->host_set private data
*/
struct sata_fsl_host_priv {
void __iomem *hcr_base;
void __iomem *ssr_base;
void __iomem *csr_base;
int irq;
};
static inline unsigned int sata_fsl_tag(unsigned int tag,
void __iomem *hcr_base)
{
/* We let libATA core do actual (queue) tag allocation */
/* all non NCQ/queued commands should have tag#0 */
if (ata_tag_internal(tag)) {
DPRINTK("mapping internal cmds to tag#0\n");
return 0;
}
if (unlikely(tag >= SATA_FSL_QUEUE_DEPTH)) {
DPRINTK("tag %d invalid : out of range\n", tag);
return 0;
}
if (unlikely((ioread32(hcr_base + CQ)) & (1 << tag))) {
DPRINTK("tag %d invalid : in use!!\n", tag);
return 0;
}
return tag;
}
static void sata_fsl_setup_cmd_hdr_entry(struct sata_fsl_port_priv *pp,
unsigned int tag, u32 desc_info,
u32 data_xfer_len, u8 num_prde,
u8 fis_len)
{
dma_addr_t cmd_descriptor_address;
cmd_descriptor_address = pp->cmdentry_paddr +
tag * SATA_FSL_CMD_DESC_SIZE;
/* NOTE: both data_xfer_len & fis_len are Dword counts */
pp->cmdslot[tag].cda = cpu_to_le32(cmd_descriptor_address);
pp->cmdslot[tag].prde_fis_len =
cpu_to_le32((num_prde << 16) | (fis_len << 2));
pp->cmdslot[tag].ttl = cpu_to_le32(data_xfer_len & ~0x03);
pp->cmdslot[tag].desc_info = cpu_to_le32(desc_info | (tag & 0x1F));
VPRINTK("cda=0x%x, prde_fis_len=0x%x, ttl=0x%x, di=0x%x\n",
pp->cmdslot[tag].cda,
pp->cmdslot[tag].prde_fis_len,
pp->cmdslot[tag].ttl, pp->cmdslot[tag].desc_info);
}
static unsigned int sata_fsl_fill_sg(struct ata_queued_cmd *qc, void *cmd_desc,
u32 *ttl, dma_addr_t cmd_desc_paddr)
{
struct scatterlist *sg;
unsigned int num_prde = 0;
u32 ttl_dwords = 0;
/*
* NOTE : direct & indirect prdt's are contigiously allocated
*/
struct prde *prd = (struct prde *)&((struct command_desc *)
cmd_desc)->prdt;
struct prde *prd_ptr_to_indirect_ext = NULL;
unsigned indirect_ext_segment_sz = 0;
dma_addr_t indirect_ext_segment_paddr;
unsigned int si;
VPRINTK("SATA FSL : cd = 0x%x, prd = 0x%x\n", cmd_desc, prd);
indirect_ext_segment_paddr = cmd_desc_paddr +
SATA_FSL_CMD_DESC_OFFSET_TO_PRDT + SATA_FSL_MAX_PRD_DIRECT * 16;
for_each_sg(qc->sg, sg, qc->n_elem, si) {
dma_addr_t sg_addr = sg_dma_address(sg);
u32 sg_len = sg_dma_len(sg);
VPRINTK("SATA FSL : fill_sg, sg_addr = 0x%x, sg_len = %d\n",
sg_addr, sg_len);
/* warn if each s/g element is not dword aligned */
if (sg_addr & 0x03)
ata_port_printk(qc->ap, KERN_ERR,
"s/g addr unaligned : 0x%x\n", sg_addr);
if (sg_len & 0x03)
ata_port_printk(qc->ap, KERN_ERR,
"s/g len unaligned : 0x%x\n", sg_len);
if (num_prde == (SATA_FSL_MAX_PRD_DIRECT - 1) &&
sg_next(sg) != NULL) {
VPRINTK("setting indirect prde\n");
prd_ptr_to_indirect_ext = prd;
prd->dba = cpu_to_le32(indirect_ext_segment_paddr);
indirect_ext_segment_sz = 0;
++prd;
++num_prde;
}
ttl_dwords += sg_len;
prd->dba = cpu_to_le32(sg_addr);
prd->ddc_and_ext =
cpu_to_le32(DATA_SNOOP_ENABLE | (sg_len & ~0x03));
VPRINTK("sg_fill, ttl=%d, dba=0x%x, ddc=0x%x\n",
ttl_dwords, prd->dba, prd->ddc_and_ext);
++num_prde;
++prd;
if (prd_ptr_to_indirect_ext)
indirect_ext_segment_sz += sg_len;
}
if (prd_ptr_to_indirect_ext) {
/* set indirect extension flag along with indirect ext. size */
prd_ptr_to_indirect_ext->ddc_and_ext =
cpu_to_le32((EXT_INDIRECT_SEG_PRD_FLAG |
DATA_SNOOP_ENABLE |
(indirect_ext_segment_sz & ~0x03)));
}
*ttl = ttl_dwords;
return num_prde;
}
static void sata_fsl_qc_prep(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct sata_fsl_port_priv *pp = ap->private_data;
struct sata_fsl_host_priv *host_priv = ap->host->private_data;
void __iomem *hcr_base = host_priv->hcr_base;
unsigned int tag = sata_fsl_tag(qc->tag, hcr_base);
struct command_desc *cd;
u32 desc_info = CMD_DESC_SNOOP_ENABLE;
u32 num_prde = 0;
u32 ttl_dwords = 0;
dma_addr_t cd_paddr;
cd = (struct command_desc *)pp->cmdentry + tag;
cd_paddr = pp->cmdentry_paddr + tag * SATA_FSL_CMD_DESC_SIZE;
ata_tf_to_fis(&qc->tf, 0, 1, (u8 *) &cd->cfis);
VPRINTK("Dumping cfis : 0x%x, 0x%x, 0x%x\n",
cd->cfis[0], cd->cfis[1], cd->cfis[2]);
if (qc->tf.protocol == ATA_PROT_NCQ) {
VPRINTK("FPDMA xfer,Sctor cnt[0:7],[8:15] = %d,%d\n",
cd->cfis[3], cd->cfis[11]);
}
/* setup "ACMD - atapi command" in cmd. desc. if this is ATAPI cmd */
if (ata_is_atapi(qc->tf.protocol)) {
desc_info |= ATAPI_CMD;
memset((void *)&cd->acmd, 0, 32);
memcpy((void *)&cd->acmd, qc->cdb, qc->dev->cdb_len);
}
if (qc->flags & ATA_QCFLAG_DMAMAP)
num_prde = sata_fsl_fill_sg(qc, (void *)cd,
&ttl_dwords, cd_paddr);
if (qc->tf.protocol == ATA_PROT_NCQ)
desc_info |= FPDMA_QUEUED_CMD;
sata_fsl_setup_cmd_hdr_entry(pp, tag, desc_info, ttl_dwords,
num_prde, 5);
VPRINTK("SATA FSL : xx_qc_prep, di = 0x%x, ttl = %d, num_prde = %d\n",
desc_info, ttl_dwords, num_prde);
}
static unsigned int sata_fsl_qc_issue(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct sata_fsl_host_priv *host_priv = ap->host->private_data;
void __iomem *hcr_base = host_priv->hcr_base;
unsigned int tag = sata_fsl_tag(qc->tag, hcr_base);
VPRINTK("xx_qc_issue called,CQ=0x%x,CA=0x%x,CE=0x%x,CC=0x%x\n",
ioread32(CQ + hcr_base),
ioread32(CA + hcr_base),
ioread32(CE + hcr_base), ioread32(CC + hcr_base));
/* Simply queue command to the controller/device */
iowrite32(1 << tag, CQ + hcr_base);
VPRINTK("xx_qc_issue called, tag=%d, CQ=0x%x, CA=0x%x\n",
tag, ioread32(CQ + hcr_base), ioread32(CA + hcr_base));
VPRINTK("CE=0x%x, DE=0x%x, CC=0x%x, CmdStat = 0x%x\n",
ioread32(CE + hcr_base),
ioread32(DE + hcr_base),
ioread32(CC + hcr_base), ioread32(COMMANDSTAT + csr_base));
return 0;
}
static int sata_fsl_scr_write(struct ata_port *ap, unsigned int sc_reg_in,
u32 val)
{
struct sata_fsl_host_priv *host_priv = ap->host->private_data;
void __iomem *ssr_base = host_priv->ssr_base;
unsigned int sc_reg;
switch (sc_reg_in) {
case SCR_STATUS:
case SCR_ERROR:
case SCR_CONTROL:
case SCR_ACTIVE:
sc_reg = sc_reg_in;
break;
default:
return -EINVAL;
}
VPRINTK("xx_scr_write, reg_in = %d\n", sc_reg);
iowrite32(val, ssr_base + (sc_reg * 4));
return 0;
}
static int sata_fsl_scr_read(struct ata_port *ap, unsigned int sc_reg_in,
u32 *val)
{
struct sata_fsl_host_priv *host_priv = ap->host->private_data;
void __iomem *ssr_base = host_priv->ssr_base;
unsigned int sc_reg;
switch (sc_reg_in) {
case SCR_STATUS:
case SCR_ERROR:
case SCR_CONTROL:
case SCR_ACTIVE:
sc_reg = sc_reg_in;
break;
default:
return -EINVAL;
}
VPRINTK("xx_scr_read, reg_in = %d\n", sc_reg);
*val = ioread32(ssr_base + (sc_reg * 4));
return 0;
}
static void sata_fsl_freeze(struct ata_port *ap)
{
struct sata_fsl_host_priv *host_priv = ap->host->private_data;
void __iomem *hcr_base = host_priv->hcr_base;
u32 temp;
VPRINTK("xx_freeze, CQ=0x%x, CA=0x%x, CE=0x%x, DE=0x%x\n",
ioread32(CQ + hcr_base),
ioread32(CA + hcr_base),
ioread32(CE + hcr_base), ioread32(DE + hcr_base));
VPRINTK("CmdStat = 0x%x\n", ioread32(csr_base + COMMANDSTAT));
/* disable interrupts on the controller/port */
temp = ioread32(hcr_base + HCONTROL);
iowrite32((temp & ~0x3F), hcr_base + HCONTROL);
VPRINTK("in xx_freeze : HControl = 0x%x, HStatus = 0x%x\n",
ioread32(hcr_base + HCONTROL), ioread32(hcr_base + HSTATUS));
}
static void sata_fsl_thaw(struct ata_port *ap)
{
struct sata_fsl_host_priv *host_priv = ap->host->private_data;
void __iomem *hcr_base = host_priv->hcr_base;
u32 temp;
/* ack. any pending IRQs for this controller/port */
temp = ioread32(hcr_base + HSTATUS);
VPRINTK("xx_thaw, pending IRQs = 0x%x\n", (temp & 0x3F));
if (temp & 0x3F)
iowrite32((temp & 0x3F), hcr_base + HSTATUS);
/* enable interrupts on the controller/port */
temp = ioread32(hcr_base + HCONTROL);
iowrite32((temp | DEFAULT_PORT_IRQ_ENABLE_MASK), hcr_base + HCONTROL);
VPRINTK("xx_thaw : HControl = 0x%x, HStatus = 0x%x\n",
ioread32(hcr_base + HCONTROL), ioread32(hcr_base + HSTATUS));
}
/*
* NOTE : 1st D2H FIS from device does not update sfis in command descriptor.
*/
static inline void sata_fsl_cache_taskfile_from_d2h_fis(struct ata_queued_cmd
*qc,
struct ata_port *ap)
{
struct sata_fsl_port_priv *pp = ap->private_data;
struct sata_fsl_host_priv *host_priv = ap->host->private_data;
void __iomem *hcr_base = host_priv->hcr_base;
unsigned int tag = sata_fsl_tag(qc->tag, hcr_base);
struct command_desc *cd;
cd = pp->cmdentry + tag;
ata_tf_from_fis(cd->sfis, &pp->tf);
}
static u8 sata_fsl_check_status(struct ata_port *ap)
{
struct sata_fsl_port_priv *pp = ap->private_data;
return pp->tf.command;
}
static void sata_fsl_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
{
struct sata_fsl_port_priv *pp = ap->private_data;
*tf = pp->tf;
}
static int sata_fsl_port_start(struct ata_port *ap)
{
struct device *dev = ap->host->dev;
struct sata_fsl_port_priv *pp;
int retval;
void *mem;
dma_addr_t mem_dma;
struct sata_fsl_host_priv *host_priv = ap->host->private_data;
void __iomem *hcr_base = host_priv->hcr_base;
u32 temp;
pp = kzalloc(sizeof(*pp), GFP_KERNEL);
if (!pp)
return -ENOMEM;
/*
* allocate per command dma alignment pad buffer, which is used
* internally by libATA to ensure that all transfers ending on
* unaligned boundaries are padded, to align on Dword boundaries
*/
retval = ata_pad_alloc(ap, dev);
if (retval) {
kfree(pp);
return retval;
}
mem = dma_alloc_coherent(dev, SATA_FSL_PORT_PRIV_DMA_SZ, &mem_dma,
GFP_KERNEL);
if (!mem) {
ata_pad_free(ap, dev);
kfree(pp);
return -ENOMEM;
}
memset(mem, 0, SATA_FSL_PORT_PRIV_DMA_SZ);
pp->cmdslot = mem;
pp->cmdslot_paddr = mem_dma;
mem += SATA_FSL_CMD_SLOT_SIZE;
mem_dma += SATA_FSL_CMD_SLOT_SIZE;
pp->cmdentry = mem;
pp->cmdentry_paddr = mem_dma;
ap->private_data = pp;
VPRINTK("CHBA = 0x%x, cmdentry_phys = 0x%x\n",
pp->cmdslot_paddr, pp->cmdentry_paddr);
/* Now, update the CHBA register in host controller cmd register set */
iowrite32(pp->cmdslot_paddr & 0xffffffff, hcr_base + CHBA);
/*
* Now, we can bring the controller on-line & also initiate
* the COMINIT sequence, we simply return here and the boot-probing
* & device discovery process is re-initiated by libATA using a
* Softreset EH (dummy) session. Hence, boot probing and device
* discovey will be part of sata_fsl_softreset() callback.
*/
temp = ioread32(hcr_base + HCONTROL);
iowrite32((temp | HCONTROL_ONLINE_PHY_RST), hcr_base + HCONTROL);
VPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
VPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));
VPRINTK("CHBA = 0x%x\n", ioread32(hcr_base + CHBA));
#ifdef CONFIG_MPC8315_DS
/*
* Workaround for 8315DS board 3gbps link-up issue,
* currently limit SATA port to GEN1 speed
*/
sata_fsl_scr_read(ap, SCR_CONTROL, &temp);
temp &= ~(0xF << 4);
temp |= (0x1 << 4);
sata_fsl_scr_write(ap, SCR_CONTROL, temp);
sata_fsl_scr_read(ap, SCR_CONTROL, &temp);
dev_printk(KERN_WARNING, dev, "scr_control, speed limited to %x\n",
temp);
#endif
return 0;
}
static void sata_fsl_port_stop(struct ata_port *ap)
{
struct device *dev = ap->host->dev;
struct sata_fsl_port_priv *pp = ap->private_data;
struct sata_fsl_host_priv *host_priv = ap->host->private_data;
void __iomem *hcr_base = host_priv->hcr_base;
u32 temp;
/*
* Force host controller to go off-line, aborting current operations
*/
temp = ioread32(hcr_base + HCONTROL);
temp &= ~HCONTROL_ONLINE_PHY_RST;
temp |= HCONTROL_FORCE_OFFLINE;
iowrite32(temp, hcr_base + HCONTROL);
/* Poll for controller to go offline - should happen immediately */
ata_wait_register(hcr_base + HSTATUS, ONLINE, ONLINE, 1, 1);
ap->private_data = NULL;
dma_free_coherent(dev, SATA_FSL_PORT_PRIV_DMA_SZ,
pp->cmdslot, pp->cmdslot_paddr);
ata_pad_free(ap, dev);
kfree(pp);
}
static unsigned int sata_fsl_dev_classify(struct ata_port *ap)
{
struct sata_fsl_host_priv *host_priv = ap->host->private_data;
void __iomem *hcr_base = host_priv->hcr_base;
struct ata_taskfile tf;
u32 temp;
temp = ioread32(hcr_base + SIGNATURE);
VPRINTK("raw sig = 0x%x\n", temp);
VPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
VPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));
tf.lbah = (temp >> 24) & 0xff;
tf.lbam = (temp >> 16) & 0xff;
tf.lbal = (temp >> 8) & 0xff;
tf.nsect = temp & 0xff;
return ata_dev_classify(&tf);
}
static int sata_fsl_softreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
struct ata_port *ap = link->ap;
struct sata_fsl_port_priv *pp = ap->private_data;
struct sata_fsl_host_priv *host_priv = ap->host->private_data;
void __iomem *hcr_base = host_priv->hcr_base;
u32 temp;
struct ata_taskfile tf;
u8 *cfis;
u32 Serror;
int i = 0;
unsigned long start_jiffies;
DPRINTK("in xx_softreset\n");
try_offline_again:
/*
* Force host controller to go off-line, aborting current operations
*/
temp = ioread32(hcr_base + HCONTROL);
temp &= ~HCONTROL_ONLINE_PHY_RST;
iowrite32(temp, hcr_base + HCONTROL);
/* Poll for controller to go offline */
temp = ata_wait_register(hcr_base + HSTATUS, ONLINE, ONLINE, 1, 500);
if (temp & ONLINE) {
ata_port_printk(ap, KERN_ERR,
"Softreset failed, not off-lined %d\n", i);
/*
* Try to offline controller atleast twice
*/
i++;
if (i == 2)
goto err;
else
goto try_offline_again;
}
DPRINTK("softreset, controller off-lined\n");
VPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
VPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));
/*
* PHY reset should remain asserted for atleast 1ms
*/
msleep(1);
/*
* Now, bring the host controller online again, this can take time
* as PHY reset and communication establishment, 1st D2H FIS and
* device signature update is done, on safe side assume 500ms
* NOTE : Host online status may be indicated immediately!!
*/
temp = ioread32(hcr_base + HCONTROL);
temp |= (HCONTROL_ONLINE_PHY_RST | HCONTROL_SNOOP_ENABLE);
iowrite32(temp, hcr_base + HCONTROL);
temp = ata_wait_register(hcr_base + HSTATUS, ONLINE, 0, 1, 500);
if (!(temp & ONLINE)) {
ata_port_printk(ap, KERN_ERR,
"Softreset failed, not on-lined\n");
goto err;
}
DPRINTK("softreset, controller off-lined & on-lined\n");
VPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
VPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));
/*
* First, wait for the PHYRDY change to occur before waiting for
* the signature, and also verify if SStatus indicates device
* presence
*/
temp = ata_wait_register(hcr_base + HSTATUS, 0xFF, 0, 1, 500);
if ((!(temp & 0x10)) || ata_link_offline(link)) {
ata_port_printk(ap, KERN_WARNING,
"No Device OR PHYRDY change,Hstatus = 0x%x\n",
ioread32(hcr_base + HSTATUS));
goto err;
}
/*
* Wait for the first D2H from device,i.e,signature update notification
*/
start_jiffies = jiffies;
temp = ata_wait_register(hcr_base + HSTATUS, 0xFF, 0x10,
500, jiffies_to_msecs(deadline - start_jiffies));
if ((temp & 0xFF) != 0x18) {
ata_port_printk(ap, KERN_WARNING, "No Signature Update\n");
goto err;
} else {
ata_port_printk(ap, KERN_INFO,
"Signature Update detected @ %d msecs\n",
jiffies_to_msecs(jiffies - start_jiffies));
}
/*
* Send a device reset (SRST) explicitly on command slot #0
* Check : will the command queue (reg) be cleared during offlining ??
* Also we will be online only if Phy commn. has been established
* and device presence has been detected, therefore if we have
* reached here, we can send a command to the target device
*/
DPRINTK("Sending SRST/device reset\n");
ata_tf_init(link->device, &tf);
cfis = (u8 *) &pp->cmdentry->cfis;
/* device reset/SRST is a control register update FIS, uses tag0 */
sata_fsl_setup_cmd_hdr_entry(pp, 0,
SRST_CMD | CMD_DESC_SNOOP_ENABLE, 0, 0, 5);
tf.ctl |= ATA_SRST; /* setup SRST bit in taskfile control reg */
ata_tf_to_fis(&tf, 0, 0, cfis);
DPRINTK("Dumping cfis : 0x%x, 0x%x, 0x%x, 0x%x\n",
cfis[0], cfis[1], cfis[2], cfis[3]);
/*
* Queue SRST command to the controller/device, ensure that no
* other commands are active on the controller/device
*/
DPRINTK("@Softreset, CQ = 0x%x, CA = 0x%x, CC = 0x%x\n",
ioread32(CQ + hcr_base),
ioread32(CA + hcr_base), ioread32(CC + hcr_base));
iowrite32(0xFFFF, CC + hcr_base);
iowrite32(1, CQ + hcr_base);
temp = ata_wait_register(CQ + hcr_base, 0x1, 0x1, 1, 5000);
if (temp & 0x1) {
ata_port_printk(ap, KERN_WARNING, "ATA_SRST issue failed\n");
DPRINTK("Softreset@5000,CQ=0x%x,CA=0x%x,CC=0x%x\n",
ioread32(CQ + hcr_base),
ioread32(CA + hcr_base), ioread32(CC + hcr_base));
sata_fsl_scr_read(ap, SCR_ERROR, &Serror);
DPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
DPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));
DPRINTK("Serror = 0x%x\n", Serror);
goto err;
}
msleep(1);
/*
* SATA device enters reset state after receving a Control register
* FIS with SRST bit asserted and it awaits another H2D Control reg.
* FIS with SRST bit cleared, then the device does internal diags &
* initialization, followed by indicating it's initialization status
* using ATA signature D2H register FIS to the host controller.
*/
sata_fsl_setup_cmd_hdr_entry(pp, 0, CMD_DESC_SNOOP_ENABLE, 0, 0, 5);
tf.ctl &= ~ATA_SRST; /* 2nd H2D Ctl. register FIS */
ata_tf_to_fis(&tf, 0, 0, cfis);
iowrite32(1, CQ + hcr_base);
msleep(150); /* ?? */
/*
* The above command would have signalled an interrupt on command
* complete, which needs special handling, by clearing the Nth
* command bit of the CCreg
*/
iowrite32(0x01, CC + hcr_base); /* We know it will be cmd#0 always */
DPRINTK("SATA FSL : Now checking device signature\n");
*class = ATA_DEV_NONE;
/* Verify if SStatus indicates device presence */
if (ata_link_online(link)) {
/*
* if we are here, device presence has been detected,
* 1st D2H FIS would have been received, but sfis in
* command desc. is not updated, but signature register
* would have been updated
*/
*class = sata_fsl_dev_classify(ap);
DPRINTK("class = %d\n", *class);
VPRINTK("ccreg = 0x%x\n", ioread32(hcr_base + CC));
VPRINTK("cereg = 0x%x\n", ioread32(hcr_base + CE));
}
return 0;
err:
return -EIO;
}
static void sata_fsl_error_handler(struct ata_port *ap)
{
DPRINTK("in xx_error_handler\n");
/* perform recovery */
ata_do_eh(ap, ata_std_prereset, sata_fsl_softreset, sata_std_hardreset,
ata_std_postreset);
}
static void sata_fsl_post_internal_cmd(struct ata_queued_cmd *qc)
{
if (qc->flags & ATA_QCFLAG_FAILED)
qc->err_mask |= AC_ERR_OTHER;
if (qc->err_mask) {
/* make DMA engine forget about the failed command */
}
}
static void sata_fsl_irq_clear(struct ata_port *ap)
{
/* unused */
}
static void sata_fsl_error_intr(struct ata_port *ap)
{
struct ata_link *link = &ap->link;
struct ata_eh_info *ehi = &link->eh_info;
struct sata_fsl_host_priv *host_priv = ap->host->private_data;
void __iomem *hcr_base = host_priv->hcr_base;
u32 hstatus, dereg, cereg = 0, SError = 0;
unsigned int err_mask = 0, action = 0;
struct ata_queued_cmd *qc;
int freeze = 0;
hstatus = ioread32(hcr_base + HSTATUS);
cereg = ioread32(hcr_base + CE);
ata_ehi_clear_desc(ehi);
/*
* Handle & Clear SError
*/
sata_fsl_scr_read(ap, SCR_ERROR, &SError);
if (unlikely(SError & 0xFFFF0000)) {
sata_fsl_scr_write(ap, SCR_ERROR, SError);
err_mask |= AC_ERR_ATA_BUS;
}
DPRINTK("error_intr,hStat=0x%x,CE=0x%x,DE =0x%x,SErr=0x%x\n",
hstatus, cereg, ioread32(hcr_base + DE), SError);
/* handle single device errors */
if (cereg) {
/*
* clear the command error, also clears queue to the device
* in error, and we can (re)issue commands to this device.
* When a device is in error all commands queued into the
* host controller and at the device are considered aborted
* and the queue for that device is stopped. Now, after
* clearing the device error, we can issue commands to the
* device to interrogate it to find the source of the error.
*/
dereg = ioread32(hcr_base + DE);
iowrite32(dereg, hcr_base + DE);
iowrite32(cereg, hcr_base + CE);
DPRINTK("single device error, CE=0x%x, DE=0x%x\n",
ioread32(hcr_base + CE), ioread32(hcr_base + DE));
/*
* We should consider this as non fatal error, and TF must
* be updated as done below.
*/
err_mask |= AC_ERR_DEV;
}
/* handle fatal errors */
if (hstatus & FATAL_ERROR_DECODE) {
err_mask |= AC_ERR_ATA_BUS;
action |= ATA_EH_SOFTRESET;
/* how will fatal error interrupts be completed ?? */
freeze = 1;
}
/* Handle PHYRDY change notification */
if (hstatus & INT_ON_PHYRDY_CHG) {
DPRINTK("SATA FSL: PHYRDY change indication\n");
/* Setup a soft-reset EH action */
ata_ehi_hotplugged(ehi);
freeze = 1;
}
/* record error info */
qc = ata_qc_from_tag(ap, link->active_tag);
if (qc) {
sata_fsl_cache_taskfile_from_d2h_fis(qc, qc->ap);
qc->err_mask |= err_mask;
} else
ehi->err_mask |= err_mask;
ehi->action |= action;
ehi->serror |= SError;
/* freeze or abort */
if (freeze)
ata_port_freeze(ap);
else
ata_port_abort(ap);
}
static void sata_fsl_qc_complete(struct ata_queued_cmd *qc)
{
if (qc->flags & ATA_QCFLAG_RESULT_TF) {
DPRINTK("xx_qc_complete called\n");
sata_fsl_cache_taskfile_from_d2h_fis(qc, qc->ap);
}
}
static void sata_fsl_host_intr(struct ata_port *ap)
{
struct ata_link *link = &ap->link;
struct sata_fsl_host_priv *host_priv = ap->host->private_data;
void __iomem *hcr_base = host_priv->hcr_base;
u32 hstatus, qc_active = 0;
struct ata_queued_cmd *qc;
u32 SError;
hstatus = ioread32(hcr_base + HSTATUS);
sata_fsl_scr_read(ap, SCR_ERROR, &SError);
if (unlikely(SError & 0xFFFF0000)) {
DPRINTK("serror @host_intr : 0x%x\n", SError);
sata_fsl_error_intr(ap);
}
if (unlikely(hstatus & INT_ON_ERROR)) {
DPRINTK("error interrupt!!\n");
sata_fsl_error_intr(ap);
return;
}
if (link->sactive) { /* only true for NCQ commands */
int i;
/* Read command completed register */
qc_active = ioread32(hcr_base + CC);
/* clear CC bit, this will also complete the interrupt */
iowrite32(qc_active, hcr_base + CC);
DPRINTK("Status of all queues :\n");
DPRINTK("qc_active/CC = 0x%x, CA = 0x%x, CE=0x%x\n",
qc_active, ioread32(hcr_base + CA),
ioread32(hcr_base + CE));
for (i = 0; i < SATA_FSL_QUEUE_DEPTH; i++) {
if (qc_active & (1 << i)) {
qc = ata_qc_from_tag(ap, i);
if (qc) {
sata_fsl_qc_complete(qc);
ata_qc_complete(qc);
}
DPRINTK
("completing ncq cmd,tag=%d,CC=0x%x,CA=0x%x\n",
i, ioread32(hcr_base + CC),
ioread32(hcr_base + CA));
}
}
return;
} else if (ap->qc_active) {
iowrite32(1, hcr_base + CC);
qc = ata_qc_from_tag(ap, link->active_tag);
DPRINTK("completing non-ncq cmd, tag=%d,CC=0x%x\n",
link->active_tag, ioread32(hcr_base + CC));
if (qc) {
sata_fsl_qc_complete(qc);
ata_qc_complete(qc);
}
} else {
/* Spurious Interrupt!! */
DPRINTK("spurious interrupt!!, CC = 0x%x\n",
ioread32(hcr_base + CC));
return;
}
}
static irqreturn_t sata_fsl_interrupt(int irq, void *dev_instance)
{
struct ata_host *host = dev_instance;
struct sata_fsl_host_priv *host_priv = host->private_data;
void __iomem *hcr_base = host_priv->hcr_base;
u32 interrupt_enables;
unsigned handled = 0;
struct ata_port *ap;
/* ack. any pending IRQs for this controller/port */
interrupt_enables = ioread32(hcr_base + HSTATUS);
interrupt_enables &= 0x3F;
DPRINTK("interrupt status 0x%x\n", interrupt_enables);
if (!interrupt_enables)
return IRQ_NONE;
spin_lock(&host->lock);
/* Assuming one port per host controller */
ap = host->ports[0];
if (ap) {
sata_fsl_host_intr(ap);
} else {
dev_printk(KERN_WARNING, host->dev,
"interrupt on disabled port 0\n");
}
iowrite32(interrupt_enables, hcr_base + HSTATUS);
handled = 1;
spin_unlock(&host->lock);
return IRQ_RETVAL(handled);
}
/*
* Multiple ports are represented by multiple SATA controllers with
* one port per controller
*/
static int sata_fsl_init_controller(struct ata_host *host)
{
struct sata_fsl_host_priv *host_priv = host->private_data;
void __iomem *hcr_base = host_priv->hcr_base;
u32 temp;
/*
* NOTE : We cannot bring the controller online before setting
* the CHBA, hence main controller initialization is done as
* part of the port_start() callback
*/
/* ack. any pending IRQs for this controller/port */
temp = ioread32(hcr_base + HSTATUS);
if (temp & 0x3F)
iowrite32((temp & 0x3F), hcr_base + HSTATUS);
/* Keep interrupts disabled on the controller */
temp = ioread32(hcr_base + HCONTROL);
iowrite32((temp & ~0x3F), hcr_base + HCONTROL);
/* Disable interrupt coalescing control(icc), for the moment */
DPRINTK("icc = 0x%x\n", ioread32(hcr_base + ICC));
iowrite32(0x01000000, hcr_base + ICC);
/* clear error registers, SError is cleared by libATA */
iowrite32(0x00000FFFF, hcr_base + CE);
iowrite32(0x00000FFFF, hcr_base + DE);
/* initially assuming no Port multiplier, set CQPMP to 0 */
iowrite32(0x0, hcr_base + CQPMP);
/*
* host controller will be brought on-line, during xx_port_start()
* callback, that should also initiate the OOB, COMINIT sequence
*/
DPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
DPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));
return 0;
}
/*
* scsi mid-layer and libata interface structures
*/
static struct scsi_host_template sata_fsl_sht = {
.module = THIS_MODULE,
.name = "sata_fsl",
.ioctl = ata_scsi_ioctl,
.queuecommand = ata_scsi_queuecmd,
.change_queue_depth = ata_scsi_change_queue_depth,
.can_queue = SATA_FSL_QUEUE_DEPTH,
.this_id = ATA_SHT_THIS_ID,
.sg_tablesize = SATA_FSL_MAX_PRD_USABLE,
.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
.emulated = ATA_SHT_EMULATED,
.use_clustering = ATA_SHT_USE_CLUSTERING,
.proc_name = "sata_fsl",
.dma_boundary = ATA_DMA_BOUNDARY,
.slave_configure = ata_scsi_slave_config,
.slave_destroy = ata_scsi_slave_destroy,
.bios_param = ata_std_bios_param,
};
static const struct ata_port_operations sata_fsl_ops = {
.check_status = sata_fsl_check_status,
.check_altstatus = sata_fsl_check_status,
.dev_select = ata_noop_dev_select,
.tf_read = sata_fsl_tf_read,
.qc_prep = sata_fsl_qc_prep,
.qc_issue = sata_fsl_qc_issue,
.irq_clear = sata_fsl_irq_clear,
.scr_read = sata_fsl_scr_read,
.scr_write = sata_fsl_scr_write,
.freeze = sata_fsl_freeze,
.thaw = sata_fsl_thaw,
.error_handler = sata_fsl_error_handler,
.post_internal_cmd = sata_fsl_post_internal_cmd,
.port_start = sata_fsl_port_start,
.port_stop = sata_fsl_port_stop,
};
static const struct ata_port_info sata_fsl_port_info[] = {
{
.flags = SATA_FSL_HOST_FLAGS,
.link_flags = SATA_FSL_HOST_LFLAGS,
.pio_mask = 0x1f, /* pio 0-4 */
.udma_mask = 0x7f, /* udma 0-6 */
.port_ops = &sata_fsl_ops,
},
};
static int sata_fsl_probe(struct of_device *ofdev,
const struct of_device_id *match)
{
int retval = 0;
void __iomem *hcr_base = NULL;
void __iomem *ssr_base = NULL;
void __iomem *csr_base = NULL;
struct sata_fsl_host_priv *host_priv = NULL;
struct resource *r;
int irq;
struct ata_host *host;
struct ata_port_info pi = sata_fsl_port_info[0];
const struct ata_port_info *ppi[] = { &pi, NULL };
dev_printk(KERN_INFO, &ofdev->dev,
"Sata FSL Platform/CSB Driver init\n");
r = kmalloc(sizeof(struct resource), GFP_KERNEL);
hcr_base = of_iomap(ofdev->node, 0);
if (!hcr_base)
goto error_exit_with_cleanup;
ssr_base = hcr_base + 0x100;
csr_base = hcr_base + 0x140;
DPRINTK("@reset i/o = 0x%x\n", ioread32(csr_base + TRANSCFG));
DPRINTK("sizeof(cmd_desc) = %d\n", sizeof(struct command_desc));
DPRINTK("sizeof(#define cmd_desc) = %d\n", SATA_FSL_CMD_DESC_SIZE);
host_priv = kzalloc(sizeof(struct sata_fsl_host_priv), GFP_KERNEL);
if (!host_priv)
goto error_exit_with_cleanup;
host_priv->hcr_base = hcr_base;
host_priv->ssr_base = ssr_base;
host_priv->csr_base = csr_base;
irq = irq_of_parse_and_map(ofdev->node, 0);
if (irq < 0) {
dev_printk(KERN_ERR, &ofdev->dev, "invalid irq from platform\n");
goto error_exit_with_cleanup;
}
host_priv->irq = irq;
/* allocate host structure */
host = ata_host_alloc_pinfo(&ofdev->dev, ppi, SATA_FSL_MAX_PORTS);
/* host->iomap is not used currently */
host->private_data = host_priv;
/* setup port(s) */
host->ports[0]->ioaddr.cmd_addr = host_priv->hcr_base;
host->ports[0]->ioaddr.scr_addr = host_priv->ssr_base;
/* initialize host controller */
sata_fsl_init_controller(host);
/*
* 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_fsl_interrupt, SATA_FSL_IRQ_FLAG,
&sata_fsl_sht);
dev_set_drvdata(&ofdev->dev, host);
return 0;
error_exit_with_cleanup:
if (hcr_base)
iounmap(hcr_base);
if (host_priv)
kfree(host_priv);
return retval;
}
static int sata_fsl_remove(struct of_device *ofdev)
{
struct ata_host *host = dev_get_drvdata(&ofdev->dev);
struct sata_fsl_host_priv *host_priv = host->private_data;
ata_host_detach(host);
dev_set_drvdata(&ofdev->dev, NULL);
irq_dispose_mapping(host_priv->irq);
iounmap(host_priv->hcr_base);
kfree(host_priv);
return 0;
}
static struct of_device_id fsl_sata_match[] = {
{
.compatible = "fsl,mpc8315-sata",
},
{
.compatible = "fsl,mpc8379-sata",
},
{},
};
MODULE_DEVICE_TABLE(of, fsl_sata_match);
static struct of_platform_driver fsl_sata_driver = {
.name = "fsl-sata",
.match_table = fsl_sata_match,
.probe = sata_fsl_probe,
.remove = sata_fsl_remove,
};
static int __init sata_fsl_init(void)
{
of_register_platform_driver(&fsl_sata_driver);
return 0;
}
static void __exit sata_fsl_exit(void)
{
of_unregister_platform_driver(&fsl_sata_driver);
}
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ashish Kalra, Freescale Semiconductor");
MODULE_DESCRIPTION("Freescale 3.0Gbps SATA controller low level driver");
MODULE_VERSION("1.10");
module_init(sata_fsl_init);
module_exit(sata_fsl_exit);
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