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linux-next/drivers/ata/pata_bf54x.c
Sonic Zhang 81b0287d34 [libata] pata_bf54x: Support sg list in bmdma transfer. 
BF54x on-chip ATAPI controller allows maximum 0x1fffe bytes to be transfered
in one ATAPI transfer. So, set the max sg_tablesize to 4.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
2012-01-17 20:49:28 -05:00

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/*
* File: drivers/ata/pata_bf54x.c
* Author: Sonic Zhang <sonic.zhang@analog.com>
*
* Created:
* Description: PATA Driver for blackfin 54x
*
* Modified:
* Copyright 2007 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/platform_device.h>
#include <asm/dma.h>
#include <asm/gpio.h>
#include <asm/portmux.h>
#define DRV_NAME "pata-bf54x"
#define DRV_VERSION "0.9"
#define ATA_REG_CTRL 0x0E
#define ATA_REG_ALTSTATUS ATA_REG_CTRL
/* These are the offset of the controller's registers */
#define ATAPI_OFFSET_CONTROL 0x00
#define ATAPI_OFFSET_STATUS 0x04
#define ATAPI_OFFSET_DEV_ADDR 0x08
#define ATAPI_OFFSET_DEV_TXBUF 0x0c
#define ATAPI_OFFSET_DEV_RXBUF 0x10
#define ATAPI_OFFSET_INT_MASK 0x14
#define ATAPI_OFFSET_INT_STATUS 0x18
#define ATAPI_OFFSET_XFER_LEN 0x1c
#define ATAPI_OFFSET_LINE_STATUS 0x20
#define ATAPI_OFFSET_SM_STATE 0x24
#define ATAPI_OFFSET_TERMINATE 0x28
#define ATAPI_OFFSET_PIO_TFRCNT 0x2c
#define ATAPI_OFFSET_DMA_TFRCNT 0x30
#define ATAPI_OFFSET_UMAIN_TFRCNT 0x34
#define ATAPI_OFFSET_UDMAOUT_TFRCNT 0x38
#define ATAPI_OFFSET_REG_TIM_0 0x40
#define ATAPI_OFFSET_PIO_TIM_0 0x44
#define ATAPI_OFFSET_PIO_TIM_1 0x48
#define ATAPI_OFFSET_MULTI_TIM_0 0x50
#define ATAPI_OFFSET_MULTI_TIM_1 0x54
#define ATAPI_OFFSET_MULTI_TIM_2 0x58
#define ATAPI_OFFSET_ULTRA_TIM_0 0x60
#define ATAPI_OFFSET_ULTRA_TIM_1 0x64
#define ATAPI_OFFSET_ULTRA_TIM_2 0x68
#define ATAPI_OFFSET_ULTRA_TIM_3 0x6c
#define ATAPI_GET_CONTROL(base)\
bfin_read16(base + ATAPI_OFFSET_CONTROL)
#define ATAPI_SET_CONTROL(base, val)\
bfin_write16(base + ATAPI_OFFSET_CONTROL, val)
#define ATAPI_GET_STATUS(base)\
bfin_read16(base + ATAPI_OFFSET_STATUS)
#define ATAPI_GET_DEV_ADDR(base)\
bfin_read16(base + ATAPI_OFFSET_DEV_ADDR)
#define ATAPI_SET_DEV_ADDR(base, val)\
bfin_write16(base + ATAPI_OFFSET_DEV_ADDR, val)
#define ATAPI_GET_DEV_TXBUF(base)\
bfin_read16(base + ATAPI_OFFSET_DEV_TXBUF)
#define ATAPI_SET_DEV_TXBUF(base, val)\
bfin_write16(base + ATAPI_OFFSET_DEV_TXBUF, val)
#define ATAPI_GET_DEV_RXBUF(base)\
bfin_read16(base + ATAPI_OFFSET_DEV_RXBUF)
#define ATAPI_SET_DEV_RXBUF(base, val)\
bfin_write16(base + ATAPI_OFFSET_DEV_RXBUF, val)
#define ATAPI_GET_INT_MASK(base)\
bfin_read16(base + ATAPI_OFFSET_INT_MASK)
#define ATAPI_SET_INT_MASK(base, val)\
bfin_write16(base + ATAPI_OFFSET_INT_MASK, val)
#define ATAPI_GET_INT_STATUS(base)\
bfin_read16(base + ATAPI_OFFSET_INT_STATUS)
#define ATAPI_SET_INT_STATUS(base, val)\
bfin_write16(base + ATAPI_OFFSET_INT_STATUS, val)
#define ATAPI_GET_XFER_LEN(base)\
bfin_read16(base + ATAPI_OFFSET_XFER_LEN)
#define ATAPI_SET_XFER_LEN(base, val)\
bfin_write16(base + ATAPI_OFFSET_XFER_LEN, val)
#define ATAPI_GET_LINE_STATUS(base)\
bfin_read16(base + ATAPI_OFFSET_LINE_STATUS)
#define ATAPI_GET_SM_STATE(base)\
bfin_read16(base + ATAPI_OFFSET_SM_STATE)
#define ATAPI_GET_TERMINATE(base)\
bfin_read16(base + ATAPI_OFFSET_TERMINATE)
#define ATAPI_SET_TERMINATE(base, val)\
bfin_write16(base + ATAPI_OFFSET_TERMINATE, val)
#define ATAPI_GET_PIO_TFRCNT(base)\
bfin_read16(base + ATAPI_OFFSET_PIO_TFRCNT)
#define ATAPI_GET_DMA_TFRCNT(base)\
bfin_read16(base + ATAPI_OFFSET_DMA_TFRCNT)
#define ATAPI_GET_UMAIN_TFRCNT(base)\
bfin_read16(base + ATAPI_OFFSET_UMAIN_TFRCNT)
#define ATAPI_GET_UDMAOUT_TFRCNT(base)\
bfin_read16(base + ATAPI_OFFSET_UDMAOUT_TFRCNT)
#define ATAPI_GET_REG_TIM_0(base)\
bfin_read16(base + ATAPI_OFFSET_REG_TIM_0)
#define ATAPI_SET_REG_TIM_0(base, val)\
bfin_write16(base + ATAPI_OFFSET_REG_TIM_0, val)
#define ATAPI_GET_PIO_TIM_0(base)\
bfin_read16(base + ATAPI_OFFSET_PIO_TIM_0)
#define ATAPI_SET_PIO_TIM_0(base, val)\
bfin_write16(base + ATAPI_OFFSET_PIO_TIM_0, val)
#define ATAPI_GET_PIO_TIM_1(base)\
bfin_read16(base + ATAPI_OFFSET_PIO_TIM_1)
#define ATAPI_SET_PIO_TIM_1(base, val)\
bfin_write16(base + ATAPI_OFFSET_PIO_TIM_1, val)
#define ATAPI_GET_MULTI_TIM_0(base)\
bfin_read16(base + ATAPI_OFFSET_MULTI_TIM_0)
#define ATAPI_SET_MULTI_TIM_0(base, val)\
bfin_write16(base + ATAPI_OFFSET_MULTI_TIM_0, val)
#define ATAPI_GET_MULTI_TIM_1(base)\
bfin_read16(base + ATAPI_OFFSET_MULTI_TIM_1)
#define ATAPI_SET_MULTI_TIM_1(base, val)\
bfin_write16(base + ATAPI_OFFSET_MULTI_TIM_1, val)
#define ATAPI_GET_MULTI_TIM_2(base)\
bfin_read16(base + ATAPI_OFFSET_MULTI_TIM_2)
#define ATAPI_SET_MULTI_TIM_2(base, val)\
bfin_write16(base + ATAPI_OFFSET_MULTI_TIM_2, val)
#define ATAPI_GET_ULTRA_TIM_0(base)\
bfin_read16(base + ATAPI_OFFSET_ULTRA_TIM_0)
#define ATAPI_SET_ULTRA_TIM_0(base, val)\
bfin_write16(base + ATAPI_OFFSET_ULTRA_TIM_0, val)
#define ATAPI_GET_ULTRA_TIM_1(base)\
bfin_read16(base + ATAPI_OFFSET_ULTRA_TIM_1)
#define ATAPI_SET_ULTRA_TIM_1(base, val)\
bfin_write16(base + ATAPI_OFFSET_ULTRA_TIM_1, val)
#define ATAPI_GET_ULTRA_TIM_2(base)\
bfin_read16(base + ATAPI_OFFSET_ULTRA_TIM_2)
#define ATAPI_SET_ULTRA_TIM_2(base, val)\
bfin_write16(base + ATAPI_OFFSET_ULTRA_TIM_2, val)
#define ATAPI_GET_ULTRA_TIM_3(base)\
bfin_read16(base + ATAPI_OFFSET_ULTRA_TIM_3)
#define ATAPI_SET_ULTRA_TIM_3(base, val)\
bfin_write16(base + ATAPI_OFFSET_ULTRA_TIM_3, val)
/**
* PIO Mode - Frequency compatibility
*/
/* mode: 0 1 2 3 4 */
static const u32 pio_fsclk[] =
{ 33333333, 33333333, 33333333, 33333333, 33333333 };
/**
* MDMA Mode - Frequency compatibility
*/
/* mode: 0 1 2 */
static const u32 mdma_fsclk[] = { 33333333, 33333333, 33333333 };
/**
* UDMA Mode - Frequency compatibility
*
* UDMA5 - 100 MB/s - SCLK = 133 MHz
* UDMA4 - 66 MB/s - SCLK >= 80 MHz
* UDMA3 - 44.4 MB/s - SCLK >= 50 MHz
* UDMA2 - 33 MB/s - SCLK >= 40 MHz
*/
/* mode: 0 1 2 3 4 5 */
static const u32 udma_fsclk[] =
{ 33333333, 33333333, 40000000, 50000000, 80000000, 133333333 };
/**
* Register transfer timing table
*/
/* mode: 0 1 2 3 4 */
/* Cycle Time */
static const u32 reg_t0min[] = { 600, 383, 330, 180, 120 };
/* DIOR/DIOW to end cycle */
static const u32 reg_t2min[] = { 290, 290, 290, 70, 25 };
/* DIOR/DIOW asserted pulse width */
static const u32 reg_teocmin[] = { 290, 290, 290, 80, 70 };
/**
* PIO timing table
*/
/* mode: 0 1 2 3 4 */
/* Cycle Time */
static const u32 pio_t0min[] = { 600, 383, 240, 180, 120 };
/* Address valid to DIOR/DIORW */
static const u32 pio_t1min[] = { 70, 50, 30, 30, 25 };
/* DIOR/DIOW to end cycle */
static const u32 pio_t2min[] = { 165, 125, 100, 80, 70 };
/* DIOR/DIOW asserted pulse width */
static const u32 pio_teocmin[] = { 165, 125, 100, 70, 25 };
/* DIOW data hold */
static const u32 pio_t4min[] = { 30, 20, 15, 10, 10 };
/* ******************************************************************
* Multiword DMA timing table
* ******************************************************************
*/
/* mode: 0 1 2 */
/* Cycle Time */
static const u32 mdma_t0min[] = { 480, 150, 120 };
/* DIOR/DIOW asserted pulse width */
static const u32 mdma_tdmin[] = { 215, 80, 70 };
/* DMACK to read data released */
static const u32 mdma_thmin[] = { 20, 15, 10 };
/* DIOR/DIOW to DMACK hold */
static const u32 mdma_tjmin[] = { 20, 5, 5 };
/* DIOR negated pulse width */
static const u32 mdma_tkrmin[] = { 50, 50, 25 };
/* DIOR negated pulse width */
static const u32 mdma_tkwmin[] = { 215, 50, 25 };
/* CS[1:0] valid to DIOR/DIOW */
static const u32 mdma_tmmin[] = { 50, 30, 25 };
/* DMACK to read data released */
static const u32 mdma_tzmax[] = { 20, 25, 25 };
/**
* Ultra DMA timing table
*/
/* mode: 0 1 2 3 4 5 */
static const u32 udma_tcycmin[] = { 112, 73, 54, 39, 25, 17 };
static const u32 udma_tdvsmin[] = { 70, 48, 31, 20, 7, 5 };
static const u32 udma_tenvmax[] = { 70, 70, 70, 55, 55, 50 };
static const u32 udma_trpmin[] = { 160, 125, 100, 100, 100, 85 };
static const u32 udma_tmin[] = { 5, 5, 5, 5, 3, 3 };
static const u32 udma_tmlimin = 20;
static const u32 udma_tzahmin = 20;
static const u32 udma_tenvmin = 20;
static const u32 udma_tackmin = 20;
static const u32 udma_tssmin = 50;
#define BFIN_MAX_SG_SEGMENTS 4
/**
*
* Function: num_clocks_min
*
* Description:
* calculate number of SCLK cycles to meet minimum timing
*/
static unsigned short num_clocks_min(unsigned long tmin,
unsigned long fsclk)
{
unsigned long tmp ;
unsigned short result;
tmp = tmin * (fsclk/1000/1000) / 1000;
result = (unsigned short)tmp;
if ((tmp*1000*1000) < (tmin*(fsclk/1000))) {
result++;
}
return result;
}
/**
* bfin_set_piomode - Initialize host controller PATA PIO timings
* @ap: Port whose timings we are configuring
* @adev: um
*
* Set PIO mode for device.
*
* LOCKING:
* None (inherited from caller).
*/
static void bfin_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
int mode = adev->pio_mode - XFER_PIO_0;
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
unsigned int fsclk = get_sclk();
unsigned short teoc_reg, t2_reg, teoc_pio;
unsigned short t4_reg, t2_pio, t1_reg;
unsigned short n0, n6, t6min = 5;
/* the most restrictive timing value is t6 and tc, the DIOW - data hold
* If one SCLK pulse is longer than this minimum value then register
* transfers cannot be supported at this frequency.
*/
n6 = num_clocks_min(t6min, fsclk);
if (mode >= 0 && mode <= 4 && n6 >= 1) {
dev_dbg(adev->link->ap->dev, "set piomode: mode=%d, fsclk=%ud\n", mode, fsclk);
/* calculate the timing values for register transfers. */
while (mode > 0 && pio_fsclk[mode] > fsclk)
mode--;
/* DIOR/DIOW to end cycle time */
t2_reg = num_clocks_min(reg_t2min[mode], fsclk);
/* DIOR/DIOW asserted pulse width */
teoc_reg = num_clocks_min(reg_teocmin[mode], fsclk);
/* Cycle Time */
n0 = num_clocks_min(reg_t0min[mode], fsclk);
/* increase t2 until we meed the minimum cycle length */
if (t2_reg + teoc_reg < n0)
t2_reg = n0 - teoc_reg;
/* calculate the timing values for pio transfers. */
/* DIOR/DIOW to end cycle time */
t2_pio = num_clocks_min(pio_t2min[mode], fsclk);
/* DIOR/DIOW asserted pulse width */
teoc_pio = num_clocks_min(pio_teocmin[mode], fsclk);
/* Cycle Time */
n0 = num_clocks_min(pio_t0min[mode], fsclk);
/* increase t2 until we meed the minimum cycle length */
if (t2_pio + teoc_pio < n0)
t2_pio = n0 - teoc_pio;
/* Address valid to DIOR/DIORW */
t1_reg = num_clocks_min(pio_t1min[mode], fsclk);
/* DIOW data hold */
t4_reg = num_clocks_min(pio_t4min[mode], fsclk);
ATAPI_SET_REG_TIM_0(base, (teoc_reg<<8 | t2_reg));
ATAPI_SET_PIO_TIM_0(base, (t4_reg<<12 | t2_pio<<4 | t1_reg));
ATAPI_SET_PIO_TIM_1(base, teoc_pio);
if (mode > 2) {
ATAPI_SET_CONTROL(base,
ATAPI_GET_CONTROL(base) | IORDY_EN);
} else {
ATAPI_SET_CONTROL(base,
ATAPI_GET_CONTROL(base) & ~IORDY_EN);
}
/* Disable host ATAPI PIO interrupts */
ATAPI_SET_INT_MASK(base, ATAPI_GET_INT_MASK(base)
& ~(PIO_DONE_MASK | HOST_TERM_XFER_MASK));
SSYNC();
}
}
/**
* bfin_set_dmamode - Initialize host controller PATA DMA timings
* @ap: Port whose timings we are configuring
* @adev: um
*
* Set UDMA mode for device.
*
* LOCKING:
* None (inherited from caller).
*/
static void bfin_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
int mode;
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
unsigned long fsclk = get_sclk();
unsigned short tenv, tack, tcyc_tdvs, tdvs, tmli, tss, trp, tzah;
unsigned short tm, td, tkr, tkw, teoc, th;
unsigned short n0, nf, tfmin = 5;
unsigned short nmin, tcyc;
mode = adev->dma_mode - XFER_UDMA_0;
if (mode >= 0 && mode <= 5) {
dev_dbg(adev->link->ap->dev, "set udmamode: mode=%d\n", mode);
/* the most restrictive timing value is t6 and tc,
* the DIOW - data hold. If one SCLK pulse is longer
* than this minimum value then register
* transfers cannot be supported at this frequency.
*/
while (mode > 0 && udma_fsclk[mode] > fsclk)
mode--;
nmin = num_clocks_min(udma_tmin[mode], fsclk);
if (nmin >= 1) {
/* calculate the timing values for Ultra DMA. */
tdvs = num_clocks_min(udma_tdvsmin[mode], fsclk);
tcyc = num_clocks_min(udma_tcycmin[mode], fsclk);
tcyc_tdvs = 2;
/* increase tcyc - tdvs (tcyc_tdvs) until we meed
* the minimum cycle length
*/
if (tdvs + tcyc_tdvs < tcyc)
tcyc_tdvs = tcyc - tdvs;
/* Mow assign the values required for the timing
* registers
*/
if (tcyc_tdvs < 2)
tcyc_tdvs = 2;
if (tdvs < 2)
tdvs = 2;
tack = num_clocks_min(udma_tackmin, fsclk);
tss = num_clocks_min(udma_tssmin, fsclk);
tmli = num_clocks_min(udma_tmlimin, fsclk);
tzah = num_clocks_min(udma_tzahmin, fsclk);
trp = num_clocks_min(udma_trpmin[mode], fsclk);
tenv = num_clocks_min(udma_tenvmin, fsclk);
if (tenv <= udma_tenvmax[mode]) {
ATAPI_SET_ULTRA_TIM_0(base, (tenv<<8 | tack));
ATAPI_SET_ULTRA_TIM_1(base,
(tcyc_tdvs<<8 | tdvs));
ATAPI_SET_ULTRA_TIM_2(base, (tmli<<8 | tss));
ATAPI_SET_ULTRA_TIM_3(base, (trp<<8 | tzah));
}
}
}
mode = adev->dma_mode - XFER_MW_DMA_0;
if (mode >= 0 && mode <= 2) {
dev_dbg(adev->link->ap->dev, "set mdmamode: mode=%d\n", mode);
/* the most restrictive timing value is tf, the DMACK to
* read data released. If one SCLK pulse is longer than
* this maximum value then the MDMA mode
* cannot be supported at this frequency.
*/
while (mode > 0 && mdma_fsclk[mode] > fsclk)
mode--;
nf = num_clocks_min(tfmin, fsclk);
if (nf >= 1) {
/* calculate the timing values for Multi-word DMA. */
/* DIOR/DIOW asserted pulse width */
td = num_clocks_min(mdma_tdmin[mode], fsclk);
/* DIOR negated pulse width */
tkw = num_clocks_min(mdma_tkwmin[mode], fsclk);
/* Cycle Time */
n0 = num_clocks_min(mdma_t0min[mode], fsclk);
/* increase tk until we meed the minimum cycle length */
if (tkw + td < n0)
tkw = n0 - td;
/* DIOR negated pulse width - read */
tkr = num_clocks_min(mdma_tkrmin[mode], fsclk);
/* CS{1:0] valid to DIOR/DIOW */
tm = num_clocks_min(mdma_tmmin[mode], fsclk);
/* DIOR/DIOW to DMACK hold */
teoc = num_clocks_min(mdma_tjmin[mode], fsclk);
/* DIOW Data hold */
th = num_clocks_min(mdma_thmin[mode], fsclk);
ATAPI_SET_MULTI_TIM_0(base, (tm<<8 | td));
ATAPI_SET_MULTI_TIM_1(base, (tkr<<8 | tkw));
ATAPI_SET_MULTI_TIM_2(base, (teoc<<8 | th));
SSYNC();
}
}
return;
}
/**
*
* Function: wait_complete
*
* Description: Waits the interrupt from device
*
*/
static inline void wait_complete(void __iomem *base, unsigned short mask)
{
unsigned short status;
unsigned int i = 0;
#define PATA_BF54X_WAIT_TIMEOUT 10000
for (i = 0; i < PATA_BF54X_WAIT_TIMEOUT; i++) {
status = ATAPI_GET_INT_STATUS(base) & mask;
if (status)
break;
}
ATAPI_SET_INT_STATUS(base, mask);
}
/**
*
* Function: write_atapi_register
*
* Description: Writes to ATA Device Resgister
*
*/
static void write_atapi_register(void __iomem *base,
unsigned long ata_reg, unsigned short value)
{
/* Program the ATA_DEV_TXBUF register with write data (to be
* written into the device).
*/
ATAPI_SET_DEV_TXBUF(base, value);
/* Program the ATA_DEV_ADDR register with address of the
* device register (0x01 to 0x0F).
*/
ATAPI_SET_DEV_ADDR(base, ata_reg);
/* Program the ATA_CTRL register with dir set to write (1)
*/
ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) | XFER_DIR));
/* ensure PIO DMA is not set */
ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) & ~PIO_USE_DMA));
/* and start the transfer */
ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) | PIO_START));
/* Wait for the interrupt to indicate the end of the transfer.
* (We need to wait on and clear rhe ATA_DEV_INT interrupt status)
*/
wait_complete(base, PIO_DONE_INT);
}
/**
*
* Function: read_atapi_register
*
*Description: Reads from ATA Device Resgister
*
*/
static unsigned short read_atapi_register(void __iomem *base,
unsigned long ata_reg)
{
/* Program the ATA_DEV_ADDR register with address of the
* device register (0x01 to 0x0F).
*/
ATAPI_SET_DEV_ADDR(base, ata_reg);
/* Program the ATA_CTRL register with dir set to read (0) and
*/
ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) & ~XFER_DIR));
/* ensure PIO DMA is not set */
ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) & ~PIO_USE_DMA));
/* and start the transfer */
ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) | PIO_START));
/* Wait for the interrupt to indicate the end of the transfer.
* (PIO_DONE interrupt is set and it doesn't seem to matter
* that we don't clear it)
*/
wait_complete(base, PIO_DONE_INT);
/* Read the ATA_DEV_RXBUF register with write data (to be
* written into the device).
*/
return ATAPI_GET_DEV_RXBUF(base);
}
/**
*
* Function: write_atapi_register_data
*
* Description: Writes to ATA Device Resgister
*
*/
static void write_atapi_data(void __iomem *base,
int len, unsigned short *buf)
{
int i;
/* Set transfer length to 1 */
ATAPI_SET_XFER_LEN(base, 1);
/* Program the ATA_DEV_ADDR register with address of the
* ATA_REG_DATA
*/
ATAPI_SET_DEV_ADDR(base, ATA_REG_DATA);
/* Program the ATA_CTRL register with dir set to write (1)
*/
ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) | XFER_DIR));
/* ensure PIO DMA is not set */
ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) & ~PIO_USE_DMA));
for (i = 0; i < len; i++) {
/* Program the ATA_DEV_TXBUF register with write data (to be
* written into the device).
*/
ATAPI_SET_DEV_TXBUF(base, buf[i]);
/* and start the transfer */
ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) | PIO_START));
/* Wait for the interrupt to indicate the end of the transfer.
* (We need to wait on and clear rhe ATA_DEV_INT
* interrupt status)
*/
wait_complete(base, PIO_DONE_INT);
}
}
/**
*
* Function: read_atapi_register_data
*
* Description: Reads from ATA Device Resgister
*
*/
static void read_atapi_data(void __iomem *base,
int len, unsigned short *buf)
{
int i;
/* Set transfer length to 1 */
ATAPI_SET_XFER_LEN(base, 1);
/* Program the ATA_DEV_ADDR register with address of the
* ATA_REG_DATA
*/
ATAPI_SET_DEV_ADDR(base, ATA_REG_DATA);
/* Program the ATA_CTRL register with dir set to read (0) and
*/
ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) & ~XFER_DIR));
/* ensure PIO DMA is not set */
ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) & ~PIO_USE_DMA));
for (i = 0; i < len; i++) {
/* and start the transfer */
ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) | PIO_START));
/* Wait for the interrupt to indicate the end of the transfer.
* (PIO_DONE interrupt is set and it doesn't seem to matter
* that we don't clear it)
*/
wait_complete(base, PIO_DONE_INT);
/* Read the ATA_DEV_RXBUF register with write data (to be
* written into the device).
*/
buf[i] = ATAPI_GET_DEV_RXBUF(base);
}
}
/**
* bfin_tf_load - send taskfile registers to host controller
* @ap: Port to which output is sent
* @tf: ATA taskfile register set
*
* Note: Original code is ata_sff_tf_load().
*/
static void bfin_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
{
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
if (tf->ctl != ap->last_ctl) {
write_atapi_register(base, ATA_REG_CTRL, tf->ctl);
ap->last_ctl = tf->ctl;
ata_wait_idle(ap);
}
if (is_addr) {
if (tf->flags & ATA_TFLAG_LBA48) {
write_atapi_register(base, ATA_REG_FEATURE,
tf->hob_feature);
write_atapi_register(base, ATA_REG_NSECT,
tf->hob_nsect);
write_atapi_register(base, ATA_REG_LBAL, tf->hob_lbal);
write_atapi_register(base, ATA_REG_LBAM, tf->hob_lbam);
write_atapi_register(base, ATA_REG_LBAH, tf->hob_lbah);
dev_dbg(ap->dev, "hob: feat 0x%X nsect 0x%X, lba 0x%X "
"0x%X 0x%X\n",
tf->hob_feature,
tf->hob_nsect,
tf->hob_lbal,
tf->hob_lbam,
tf->hob_lbah);
}
write_atapi_register(base, ATA_REG_FEATURE, tf->feature);
write_atapi_register(base, ATA_REG_NSECT, tf->nsect);
write_atapi_register(base, ATA_REG_LBAL, tf->lbal);
write_atapi_register(base, ATA_REG_LBAM, tf->lbam);
write_atapi_register(base, ATA_REG_LBAH, tf->lbah);
dev_dbg(ap->dev, "feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
tf->feature,
tf->nsect,
tf->lbal,
tf->lbam,
tf->lbah);
}
if (tf->flags & ATA_TFLAG_DEVICE) {
write_atapi_register(base, ATA_REG_DEVICE, tf->device);
dev_dbg(ap->dev, "device 0x%X\n", tf->device);
}
ata_wait_idle(ap);
}
/**
* bfin_check_status - Read device status reg & clear interrupt
* @ap: port where the device is
*
* Note: Original code is ata_check_status().
*/
static u8 bfin_check_status(struct ata_port *ap)
{
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
return read_atapi_register(base, ATA_REG_STATUS);
}
/**
* bfin_tf_read - input device's ATA taskfile shadow registers
* @ap: Port from which input is read
* @tf: ATA taskfile register set for storing input
*
* Note: Original code is ata_sff_tf_read().
*/
static void bfin_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
{
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
tf->command = bfin_check_status(ap);
tf->feature = read_atapi_register(base, ATA_REG_ERR);
tf->nsect = read_atapi_register(base, ATA_REG_NSECT);
tf->lbal = read_atapi_register(base, ATA_REG_LBAL);
tf->lbam = read_atapi_register(base, ATA_REG_LBAM);
tf->lbah = read_atapi_register(base, ATA_REG_LBAH);
tf->device = read_atapi_register(base, ATA_REG_DEVICE);
if (tf->flags & ATA_TFLAG_LBA48) {
write_atapi_register(base, ATA_REG_CTRL, tf->ctl | ATA_HOB);
tf->hob_feature = read_atapi_register(base, ATA_REG_ERR);
tf->hob_nsect = read_atapi_register(base, ATA_REG_NSECT);
tf->hob_lbal = read_atapi_register(base, ATA_REG_LBAL);
tf->hob_lbam = read_atapi_register(base, ATA_REG_LBAM);
tf->hob_lbah = read_atapi_register(base, ATA_REG_LBAH);
}
}
/**
* bfin_exec_command - issue ATA command to host controller
* @ap: port to which command is being issued
* @tf: ATA taskfile register set
*
* Note: Original code is ata_sff_exec_command().
*/
static void bfin_exec_command(struct ata_port *ap,
const struct ata_taskfile *tf)
{
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
dev_dbg(ap->dev, "ata%u: cmd 0x%X\n", ap->print_id, tf->command);
write_atapi_register(base, ATA_REG_CMD, tf->command);
ata_sff_pause(ap);
}
/**
* bfin_check_altstatus - Read device alternate status reg
* @ap: port where the device is
*/
static u8 bfin_check_altstatus(struct ata_port *ap)
{
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
return read_atapi_register(base, ATA_REG_ALTSTATUS);
}
/**
* bfin_dev_select - Select device 0/1 on ATA bus
* @ap: ATA channel to manipulate
* @device: ATA device (numbered from zero) to select
*
* Note: Original code is ata_sff_dev_select().
*/
static void bfin_dev_select(struct ata_port *ap, unsigned int device)
{
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
u8 tmp;
if (device == 0)
tmp = ATA_DEVICE_OBS;
else
tmp = ATA_DEVICE_OBS | ATA_DEV1;
write_atapi_register(base, ATA_REG_DEVICE, tmp);
ata_sff_pause(ap);
}
/**
* bfin_set_devctl - Write device control reg
* @ap: port where the device is
* @ctl: value to write
*/
static void bfin_set_devctl(struct ata_port *ap, u8 ctl)
{
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
write_atapi_register(base, ATA_REG_CTRL, ctl);
}
/**
* bfin_bmdma_setup - Set up IDE DMA transaction
* @qc: Info associated with this ATA transaction.
*
* Note: Original code is ata_bmdma_setup().
*/
static void bfin_bmdma_setup(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct dma_desc_array *dma_desc_cpu = (struct dma_desc_array *)ap->bmdma_prd;
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
unsigned short config = DMAFLOW_ARRAY | NDSIZE_5 | RESTART | WDSIZE_16 | DMAEN;
struct scatterlist *sg;
unsigned int si;
unsigned int channel;
unsigned int dir;
unsigned int size = 0;
dev_dbg(qc->ap->dev, "in atapi dma setup\n");
/* Program the ATA_CTRL register with dir */
if (qc->tf.flags & ATA_TFLAG_WRITE) {
channel = CH_ATAPI_TX;
dir = DMA_TO_DEVICE;
} else {
channel = CH_ATAPI_RX;
dir = DMA_FROM_DEVICE;
config |= WNR;
}
dma_map_sg(ap->dev, qc->sg, qc->n_elem, dir);
/* fill the ATAPI DMA controller */
for_each_sg(qc->sg, sg, qc->n_elem, si) {
dma_desc_cpu[si].start_addr = sg_dma_address(sg);
dma_desc_cpu[si].cfg = config;
dma_desc_cpu[si].x_count = sg_dma_len(sg) >> 1;
dma_desc_cpu[si].x_modify = 2;
size += sg_dma_len(sg);
}
/* Set the last descriptor to stop mode */
dma_desc_cpu[qc->n_elem - 1].cfg &= ~(DMAFLOW | NDSIZE);
flush_dcache_range((unsigned int)dma_desc_cpu,
(unsigned int)dma_desc_cpu +
qc->n_elem * sizeof(struct dma_desc_array));
/* Enable ATA DMA operation*/
set_dma_curr_desc_addr(channel, (unsigned long *)ap->bmdma_prd_dma);
set_dma_x_count(channel, 0);
set_dma_x_modify(channel, 0);
set_dma_config(channel, config);
SSYNC();
/* Send ATA DMA command */
bfin_exec_command(ap, &qc->tf);
if (qc->tf.flags & ATA_TFLAG_WRITE) {
/* set ATA DMA write direction */
ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base)
| XFER_DIR));
} else {
/* set ATA DMA read direction */
ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base)
& ~XFER_DIR));
}
/* Reset all transfer count */
ATAPI_SET_CONTROL(base, ATAPI_GET_CONTROL(base) | TFRCNT_RST);
/* Set ATAPI state machine contorl in terminate sequence */
ATAPI_SET_CONTROL(base, ATAPI_GET_CONTROL(base) | END_ON_TERM);
/* Set transfer length to the total size of sg buffers */
ATAPI_SET_XFER_LEN(base, size >> 1);
}
/**
* bfin_bmdma_start - Start an IDE DMA transaction
* @qc: Info associated with this ATA transaction.
*
* Note: Original code is ata_bmdma_start().
*/
static void bfin_bmdma_start(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
dev_dbg(qc->ap->dev, "in atapi dma start\n");
if (!(ap->udma_mask || ap->mwdma_mask))
return;
/* start ATAPI transfer*/
if (ap->udma_mask)
ATAPI_SET_CONTROL(base, ATAPI_GET_CONTROL(base)
| ULTRA_START);
else
ATAPI_SET_CONTROL(base, ATAPI_GET_CONTROL(base)
| MULTI_START);
}
/**
* bfin_bmdma_stop - Stop IDE DMA transfer
* @qc: Command we are ending DMA for
*/
static void bfin_bmdma_stop(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
unsigned int dir;
dev_dbg(qc->ap->dev, "in atapi dma stop\n");
if (!(ap->udma_mask || ap->mwdma_mask))
return;
/* stop ATAPI DMA controller*/
if (qc->tf.flags & ATA_TFLAG_WRITE) {
dir = DMA_TO_DEVICE;
disable_dma(CH_ATAPI_TX);
} else {
dir = DMA_FROM_DEVICE;
disable_dma(CH_ATAPI_RX);
}
dma_unmap_sg(ap->dev, qc->sg, qc->n_elem, dir);
}
/**
* bfin_devchk - PATA device presence detection
* @ap: ATA channel to examine
* @device: Device to examine (starting at zero)
*
* Note: Original code is ata_devchk().
*/
static unsigned int bfin_devchk(struct ata_port *ap,
unsigned int device)
{
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
u8 nsect, lbal;
bfin_dev_select(ap, device);
write_atapi_register(base, ATA_REG_NSECT, 0x55);
write_atapi_register(base, ATA_REG_LBAL, 0xaa);
write_atapi_register(base, ATA_REG_NSECT, 0xaa);
write_atapi_register(base, ATA_REG_LBAL, 0x55);
write_atapi_register(base, ATA_REG_NSECT, 0x55);
write_atapi_register(base, ATA_REG_LBAL, 0xaa);
nsect = read_atapi_register(base, ATA_REG_NSECT);
lbal = read_atapi_register(base, ATA_REG_LBAL);
if ((nsect == 0x55) && (lbal == 0xaa))
return 1; /* we found a device */
return 0; /* nothing found */
}
/**
* bfin_bus_post_reset - PATA device post reset
*
* Note: Original code is ata_bus_post_reset().
*/
static void bfin_bus_post_reset(struct ata_port *ap, unsigned int devmask)
{
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
unsigned int dev0 = devmask & (1 << 0);
unsigned int dev1 = devmask & (1 << 1);
unsigned long deadline;
/* if device 0 was found in ata_devchk, wait for its
* BSY bit to clear
*/
if (dev0)
ata_sff_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
/* if device 1 was found in ata_devchk, wait for
* register access, then wait for BSY to clear
*/
deadline = ata_deadline(jiffies, ATA_TMOUT_BOOT);
while (dev1) {
u8 nsect, lbal;
bfin_dev_select(ap, 1);
nsect = read_atapi_register(base, ATA_REG_NSECT);
lbal = read_atapi_register(base, ATA_REG_LBAL);
if ((nsect == 1) && (lbal == 1))
break;
if (time_after(jiffies, deadline)) {
dev1 = 0;
break;
}
ata_msleep(ap, 50); /* give drive a breather */
}
if (dev1)
ata_sff_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
/* is all this really necessary? */
bfin_dev_select(ap, 0);
if (dev1)
bfin_dev_select(ap, 1);
if (dev0)
bfin_dev_select(ap, 0);
}
/**
* bfin_bus_softreset - PATA device software reset
*
* Note: Original code is ata_bus_softreset().
*/
static unsigned int bfin_bus_softreset(struct ata_port *ap,
unsigned int devmask)
{
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
/* software reset. causes dev0 to be selected */
write_atapi_register(base, ATA_REG_CTRL, ap->ctl);
udelay(20);
write_atapi_register(base, ATA_REG_CTRL, ap->ctl | ATA_SRST);
udelay(20);
write_atapi_register(base, ATA_REG_CTRL, ap->ctl);
/* spec mandates ">= 2ms" before checking status.
* We wait 150ms, because that was the magic delay used for
* ATAPI devices in Hale Landis's ATADRVR, for the period of time
* between when the ATA command register is written, and then
* status is checked. Because waiting for "a while" before
* checking status is fine, post SRST, we perform this magic
* delay here as well.
*
* Old drivers/ide uses the 2mS rule and then waits for ready
*/
ata_msleep(ap, 150);
/* Before we perform post reset processing we want to see if
* the bus shows 0xFF because the odd clown forgets the D7
* pulldown resistor.
*/
if (bfin_check_status(ap) == 0xFF)
return 0;
bfin_bus_post_reset(ap, devmask);
return 0;
}
/**
* bfin_softreset - reset host port via ATA SRST
* @ap: port to reset
* @classes: resulting classes of attached devices
*
* Note: Original code is ata_sff_softreset().
*/
static int bfin_softreset(struct ata_link *link, unsigned int *classes,
unsigned long deadline)
{
struct ata_port *ap = link->ap;
unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
unsigned int devmask = 0, err_mask;
u8 err;
/* determine if device 0/1 are present */
if (bfin_devchk(ap, 0))
devmask |= (1 << 0);
if (slave_possible && bfin_devchk(ap, 1))
devmask |= (1 << 1);
/* select device 0 again */
bfin_dev_select(ap, 0);
/* issue bus reset */
err_mask = bfin_bus_softreset(ap, devmask);
if (err_mask) {
ata_port_err(ap, "SRST failed (err_mask=0x%x)\n",
err_mask);
return -EIO;
}
/* determine by signature whether we have ATA or ATAPI devices */
classes[0] = ata_sff_dev_classify(&ap->link.device[0],
devmask & (1 << 0), &err);
if (slave_possible && err != 0x81)
classes[1] = ata_sff_dev_classify(&ap->link.device[1],
devmask & (1 << 1), &err);
return 0;
}
/**
* bfin_bmdma_status - Read IDE DMA status
* @ap: Port associated with this ATA transaction.
*/
static unsigned char bfin_bmdma_status(struct ata_port *ap)
{
unsigned char host_stat = 0;
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
if (ATAPI_GET_STATUS(base) & (MULTI_XFER_ON | ULTRA_XFER_ON))
host_stat |= ATA_DMA_ACTIVE;
if (ATAPI_GET_INT_STATUS(base) & ATAPI_DEV_INT)
host_stat |= ATA_DMA_INTR;
dev_dbg(ap->dev, "ATAPI: host_stat=0x%x\n", host_stat);
return host_stat;
}
/**
* bfin_data_xfer - Transfer data by PIO
* @adev: device for this I/O
* @buf: data buffer
* @buflen: buffer length
* @write_data: read/write
*
* Note: Original code is ata_sff_data_xfer().
*/
static unsigned int bfin_data_xfer(struct ata_device *dev, unsigned char *buf,
unsigned int buflen, int rw)
{
struct ata_port *ap = dev->link->ap;
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
unsigned int words = buflen >> 1;
unsigned short *buf16 = (u16 *)buf;
/* Transfer multiple of 2 bytes */
if (rw == READ)
read_atapi_data(base, words, buf16);
else
write_atapi_data(base, words, buf16);
/* Transfer trailing 1 byte, if any. */
if (unlikely(buflen & 0x01)) {
unsigned short align_buf[1] = { 0 };
unsigned char *trailing_buf = buf + buflen - 1;
if (rw == READ) {
read_atapi_data(base, 1, align_buf);
memcpy(trailing_buf, align_buf, 1);
} else {
memcpy(align_buf, trailing_buf, 1);
write_atapi_data(base, 1, align_buf);
}
words++;
}
return words << 1;
}
/**
* bfin_irq_clear - Clear ATAPI interrupt.
* @ap: Port associated with this ATA transaction.
*
* Note: Original code is ata_bmdma_irq_clear().
*/
static void bfin_irq_clear(struct ata_port *ap)
{
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
dev_dbg(ap->dev, "in atapi irq clear\n");
ATAPI_SET_INT_STATUS(base, ATAPI_GET_INT_STATUS(base)|ATAPI_DEV_INT
| MULTI_DONE_INT | UDMAIN_DONE_INT | UDMAOUT_DONE_INT
| MULTI_TERM_INT | UDMAIN_TERM_INT | UDMAOUT_TERM_INT);
}
/**
* bfin_thaw - Thaw DMA controller port
* @ap: port to thaw
*
* Note: Original code is ata_sff_thaw().
*/
void bfin_thaw(struct ata_port *ap)
{
dev_dbg(ap->dev, "in atapi dma thaw\n");
bfin_check_status(ap);
ata_sff_irq_on(ap);
}
/**
* bfin_postreset - standard postreset callback
* @ap: the target ata_port
* @classes: classes of attached devices
*
* Note: Original code is ata_sff_postreset().
*/
static void bfin_postreset(struct ata_link *link, unsigned int *classes)
{
struct ata_port *ap = link->ap;
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
/* re-enable interrupts */
ata_sff_irq_on(ap);
/* is double-select really necessary? */
if (classes[0] != ATA_DEV_NONE)
bfin_dev_select(ap, 1);
if (classes[1] != ATA_DEV_NONE)
bfin_dev_select(ap, 0);
/* bail out if no device is present */
if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
return;
}
/* set up device control */
write_atapi_register(base, ATA_REG_CTRL, ap->ctl);
}
static void bfin_port_stop(struct ata_port *ap)
{
dev_dbg(ap->dev, "in atapi port stop\n");
if (ap->udma_mask != 0 || ap->mwdma_mask != 0) {
dma_free_coherent(ap->dev,
BFIN_MAX_SG_SEGMENTS * sizeof(struct dma_desc_array),
ap->bmdma_prd,
ap->bmdma_prd_dma);
free_dma(CH_ATAPI_RX);
free_dma(CH_ATAPI_TX);
}
}
static int bfin_port_start(struct ata_port *ap)
{
dev_dbg(ap->dev, "in atapi port start\n");
if (!(ap->udma_mask || ap->mwdma_mask))
return 0;
ap->bmdma_prd = dma_alloc_coherent(ap->dev,
BFIN_MAX_SG_SEGMENTS * sizeof(struct dma_desc_array),
&ap->bmdma_prd_dma,
GFP_KERNEL);
if (ap->bmdma_prd == NULL) {
dev_info(ap->dev, "Unable to allocate DMA descriptor array.\n");
goto out;
}
if (request_dma(CH_ATAPI_RX, "BFIN ATAPI RX DMA") >= 0) {
if (request_dma(CH_ATAPI_TX,
"BFIN ATAPI TX DMA") >= 0)
return 0;
free_dma(CH_ATAPI_RX);
dma_free_coherent(ap->dev,
BFIN_MAX_SG_SEGMENTS * sizeof(struct dma_desc_array),
ap->bmdma_prd,
ap->bmdma_prd_dma);
}
out:
ap->udma_mask = 0;
ap->mwdma_mask = 0;
dev_err(ap->dev, "Unable to request ATAPI DMA!"
" Continue in PIO mode.\n");
return 0;
}
static unsigned int bfin_ata_host_intr(struct ata_port *ap,
struct ata_queued_cmd *qc)
{
struct ata_eh_info *ehi = &ap->link.eh_info;
u8 status, host_stat = 0;
VPRINTK("ata%u: protocol %d task_state %d\n",
ap->print_id, qc->tf.protocol, ap->hsm_task_state);
/* Check whether we are expecting interrupt in this state */
switch (ap->hsm_task_state) {
case HSM_ST_FIRST:
/* Some pre-ATAPI-4 devices assert INTRQ
* at this state when ready to receive CDB.
*/
/* Check the ATA_DFLAG_CDB_INTR flag is enough here.
* The flag was turned on only for atapi devices.
* No need to check is_atapi_taskfile(&qc->tf) again.
*/
if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
goto idle_irq;
break;
case HSM_ST_LAST:
if (qc->tf.protocol == ATA_PROT_DMA ||
qc->tf.protocol == ATAPI_PROT_DMA) {
/* check status of DMA engine */
host_stat = ap->ops->bmdma_status(ap);
VPRINTK("ata%u: host_stat 0x%X\n",
ap->print_id, host_stat);
/* if it's not our irq... */
if (!(host_stat & ATA_DMA_INTR))
goto idle_irq;
/* before we do anything else, clear DMA-Start bit */
ap->ops->bmdma_stop(qc);
if (unlikely(host_stat & ATA_DMA_ERR)) {
/* error when transferring data to/from memory */
qc->err_mask |= AC_ERR_HOST_BUS;
ap->hsm_task_state = HSM_ST_ERR;
}
}
break;
case HSM_ST:
break;
default:
goto idle_irq;
}
/* check altstatus */
status = ap->ops->sff_check_altstatus(ap);
if (status & ATA_BUSY)
goto busy_ata;
/* check main status, clearing INTRQ */
status = ap->ops->sff_check_status(ap);
if (unlikely(status & ATA_BUSY))
goto busy_ata;
/* ack bmdma irq events */
ap->ops->sff_irq_clear(ap);
ata_sff_hsm_move(ap, qc, status, 0);
if (unlikely(qc->err_mask) && (qc->tf.protocol == ATA_PROT_DMA ||
qc->tf.protocol == ATAPI_PROT_DMA))
ata_ehi_push_desc(ehi, "BMDMA stat 0x%x", host_stat);
busy_ata:
return 1; /* irq handled */
idle_irq:
ap->stats.idle_irq++;
#ifdef ATA_IRQ_TRAP
if ((ap->stats.idle_irq % 1000) == 0) {
ap->ops->irq_ack(ap, 0); /* debug trap */
ata_port_warn(ap, "irq trap\n");
return 1;
}
#endif
return 0; /* irq not handled */
}
static irqreturn_t bfin_ata_interrupt(int irq, void *dev_instance)
{
struct ata_host *host = dev_instance;
unsigned int i;
unsigned int handled = 0;
unsigned long flags;
/* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
spin_lock_irqsave(&host->lock, flags);
for (i = 0; i < host->n_ports; i++) {
struct ata_port *ap = host->ports[i];
struct ata_queued_cmd *qc;
qc = ata_qc_from_tag(ap, ap->link.active_tag);
if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
handled |= bfin_ata_host_intr(ap, qc);
}
spin_unlock_irqrestore(&host->lock, flags);
return IRQ_RETVAL(handled);
}
static struct scsi_host_template bfin_sht = {
ATA_BASE_SHT(DRV_NAME),
.sg_tablesize = BFIN_MAX_SG_SEGMENTS,
.dma_boundary = ATA_DMA_BOUNDARY,
};
static struct ata_port_operations bfin_pata_ops = {
.inherits = &ata_bmdma_port_ops,
.set_piomode = bfin_set_piomode,
.set_dmamode = bfin_set_dmamode,
.sff_tf_load = bfin_tf_load,
.sff_tf_read = bfin_tf_read,
.sff_exec_command = bfin_exec_command,
.sff_check_status = bfin_check_status,
.sff_check_altstatus = bfin_check_altstatus,
.sff_dev_select = bfin_dev_select,
.sff_set_devctl = bfin_set_devctl,
.bmdma_setup = bfin_bmdma_setup,
.bmdma_start = bfin_bmdma_start,
.bmdma_stop = bfin_bmdma_stop,
.bmdma_status = bfin_bmdma_status,
.sff_data_xfer = bfin_data_xfer,
.qc_prep = ata_noop_qc_prep,
.thaw = bfin_thaw,
.softreset = bfin_softreset,
.postreset = bfin_postreset,
.sff_irq_clear = bfin_irq_clear,
.port_start = bfin_port_start,
.port_stop = bfin_port_stop,
};
static struct ata_port_info bfin_port_info[] = {
{
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = 0,
.udma_mask = 0,
.port_ops = &bfin_pata_ops,
},
};
/**
* bfin_reset_controller - initialize BF54x ATAPI controller.
*/
static int bfin_reset_controller(struct ata_host *host)
{
void __iomem *base = (void __iomem *)host->ports[0]->ioaddr.ctl_addr;
int count;
unsigned short status;
/* Disable all ATAPI interrupts */
ATAPI_SET_INT_MASK(base, 0);
SSYNC();
/* Assert the RESET signal 25us*/
ATAPI_SET_CONTROL(base, ATAPI_GET_CONTROL(base) | DEV_RST);
udelay(30);
/* Negate the RESET signal for 2ms*/
ATAPI_SET_CONTROL(base, ATAPI_GET_CONTROL(base) & ~DEV_RST);
msleep(2);
/* Wait on Busy flag to clear */
count = 10000000;
do {
status = read_atapi_register(base, ATA_REG_STATUS);
} while (--count && (status & ATA_BUSY));
/* Enable only ATAPI Device interrupt */
ATAPI_SET_INT_MASK(base, 1);
SSYNC();
return (!count);
}
/**
* atapi_io_port - define atapi peripheral port pins.
*/
static unsigned short atapi_io_port[] = {
P_ATAPI_RESET,
P_ATAPI_DIOR,
P_ATAPI_DIOW,
P_ATAPI_CS0,
P_ATAPI_CS1,
P_ATAPI_DMACK,
P_ATAPI_DMARQ,
P_ATAPI_INTRQ,
P_ATAPI_IORDY,
P_ATAPI_D0A,
P_ATAPI_D1A,
P_ATAPI_D2A,
P_ATAPI_D3A,
P_ATAPI_D4A,
P_ATAPI_D5A,
P_ATAPI_D6A,
P_ATAPI_D7A,
P_ATAPI_D8A,
P_ATAPI_D9A,
P_ATAPI_D10A,
P_ATAPI_D11A,
P_ATAPI_D12A,
P_ATAPI_D13A,
P_ATAPI_D14A,
P_ATAPI_D15A,
P_ATAPI_A0A,
P_ATAPI_A1A,
P_ATAPI_A2A,
0
};
/**
* bfin_atapi_probe - attach a bfin atapi interface
* @pdev: platform device
*
* Register a bfin atapi interface.
*
*
* Platform devices are expected to contain 2 resources per port:
*
* - I/O Base (IORESOURCE_IO)
* - IRQ (IORESOURCE_IRQ)
*
*/
static int __devinit bfin_atapi_probe(struct platform_device *pdev)
{
int board_idx = 0;
struct resource *res;
struct ata_host *host;
unsigned int fsclk = get_sclk();
int udma_mode = 5;
const struct ata_port_info *ppi[] =
{ &bfin_port_info[board_idx], NULL };
/*
* Simple resource validation ..
*/
if (unlikely(pdev->num_resources != 2)) {
dev_err(&pdev->dev, "invalid number of resources\n");
return -EINVAL;
}
/*
* Get the register base first
*/
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL)
return -EINVAL;
while (bfin_port_info[board_idx].udma_mask > 0 &&
udma_fsclk[udma_mode] > fsclk) {
udma_mode--;
bfin_port_info[board_idx].udma_mask >>= 1;
}
/*
* Now that that's out of the way, wire up the port..
*/
host = ata_host_alloc_pinfo(&pdev->dev, ppi, 1);
if (!host)
return -ENOMEM;
host->ports[0]->ioaddr.ctl_addr = (void *)res->start;
if (peripheral_request_list(atapi_io_port, "atapi-io-port")) {
dev_err(&pdev->dev, "Requesting Peripherals failed\n");
return -EFAULT;
}
if (bfin_reset_controller(host)) {
peripheral_free_list(atapi_io_port);
dev_err(&pdev->dev, "Fail to reset ATAPI device\n");
return -EFAULT;
}
if (ata_host_activate(host, platform_get_irq(pdev, 0),
bfin_ata_interrupt, IRQF_SHARED, &bfin_sht) != 0) {
peripheral_free_list(atapi_io_port);
dev_err(&pdev->dev, "Fail to attach ATAPI device\n");
return -ENODEV;
}
dev_set_drvdata(&pdev->dev, host);
return 0;
}
/**
* bfin_atapi_remove - unplug a bfin atapi interface
* @pdev: platform device
*
* A bfin atapi device has been unplugged. Perform the needed
* cleanup. Also called on module unload for any active devices.
*/
static int __devexit bfin_atapi_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ata_host *host = dev_get_drvdata(dev);
ata_host_detach(host);
dev_set_drvdata(&pdev->dev, NULL);
peripheral_free_list(atapi_io_port);
return 0;
}
#ifdef CONFIG_PM
static int bfin_atapi_suspend(struct platform_device *pdev, pm_message_t state)
{
struct ata_host *host = dev_get_drvdata(&pdev->dev);
if (host)
return ata_host_suspend(host, state);
else
return 0;
}
static int bfin_atapi_resume(struct platform_device *pdev)
{
struct ata_host *host = dev_get_drvdata(&pdev->dev);
int ret;
if (host) {
ret = bfin_reset_controller(host);
if (ret) {
printk(KERN_ERR DRV_NAME ": Error during HW init\n");
return ret;
}
ata_host_resume(host);
}
return 0;
}
#else
#define bfin_atapi_suspend NULL
#define bfin_atapi_resume NULL
#endif
static struct platform_driver bfin_atapi_driver = {
.probe = bfin_atapi_probe,
.remove = __devexit_p(bfin_atapi_remove),
.suspend = bfin_atapi_suspend,
.resume = bfin_atapi_resume,
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
};
#define ATAPI_MODE_SIZE 10
static char bfin_atapi_mode[ATAPI_MODE_SIZE];
static int __init bfin_atapi_init(void)
{
pr_info("register bfin atapi driver\n");
switch(bfin_atapi_mode[0]) {
case 'p':
case 'P':
break;
case 'm':
case 'M':
bfin_port_info[0].mwdma_mask = ATA_MWDMA2;
break;
default:
bfin_port_info[0].udma_mask = ATA_UDMA5;
};
return platform_driver_register(&bfin_atapi_driver);
}
static void __exit bfin_atapi_exit(void)
{
platform_driver_unregister(&bfin_atapi_driver);
}
module_init(bfin_atapi_init);
module_exit(bfin_atapi_exit);
/*
* ATAPI mode:
* pio/PIO
* udma/UDMA (default)
* mwdma/MWDMA
*/
module_param_string(bfin_atapi_mode, bfin_atapi_mode, ATAPI_MODE_SIZE, 0);
MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
MODULE_DESCRIPTION("PATA driver for blackfin 54x ATAPI controller");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
MODULE_ALIAS("platform:" DRV_NAME);
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