forked from amir73il/linux
/
pata_bf54x.c
1632 lines (1395 loc) · 43.4 KB
/
pata_bf54x.c
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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;
/**
*
* 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) {
pr_debug("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
* @udma: udma mode, 0 - 6
*
* 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) {
pr_debug("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));
/* Enable host ATAPI Untra DMA interrupts */
ATAPI_SET_INT_MASK(base,
ATAPI_GET_INT_MASK(base)
| UDMAIN_DONE_MASK
| UDMAOUT_DONE_MASK
| UDMAIN_TERM_MASK
| UDMAOUT_TERM_MASK);
}
}
}
mode = adev->dma_mode - XFER_MW_DMA_0;
if (mode >= 0 && mode <= 2) {
pr_debug("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));
/* Enable host ATAPI Multi DMA interrupts */
ATAPI_SET_INT_MASK(base, ATAPI_GET_INT_MASK(base)
| MULTI_DONE_MASK | MULTI_TERM_MASK);
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_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);
pr_debug("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);
pr_debug("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);
pr_debug("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_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_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;
pr_debug("ata%u: cmd 0x%X\n", ap->print_id, tf->command);
write_atapi_register(base, ATA_REG_CMD, tf->command);
ata_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_std_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_std_dev_select().
*/
static void bfin_std_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_pause(ap);
}
/**
* 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)
{
unsigned short config = WDSIZE_16;
struct scatterlist *sg;
pr_debug("in atapi dma setup\n");
/* Program the ATA_CTRL register with dir */
if (qc->tf.flags & ATA_TFLAG_WRITE) {
/* fill the ATAPI DMA controller */
set_dma_config(CH_ATAPI_TX, config);
set_dma_x_modify(CH_ATAPI_TX, 2);
ata_for_each_sg(sg, qc) {
set_dma_start_addr(CH_ATAPI_TX, sg_dma_address(sg));
set_dma_x_count(CH_ATAPI_TX, sg_dma_len(sg) >> 1);
}
} else {
config |= WNR;
/* fill the ATAPI DMA controller */
set_dma_config(CH_ATAPI_RX, config);
set_dma_x_modify(CH_ATAPI_RX, 2);
ata_for_each_sg(sg, qc) {
set_dma_start_addr(CH_ATAPI_RX, sg_dma_address(sg));
set_dma_x_count(CH_ATAPI_RX, sg_dma_len(sg) >> 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;
struct scatterlist *sg;
pr_debug("in atapi dma start\n");
if (!(ap->udma_mask || ap->mwdma_mask))
return;
/* start ATAPI DMA controller*/
if (qc->tf.flags & ATA_TFLAG_WRITE) {
/*
* On blackfin arch, uncacheable memory is not
* allocated with flag GFP_DMA. DMA buffer from
* common kenel code should be flushed if WB
* data cache is enabled. Otherwise, this loop
* is an empty loop and optimized out.
*/
ata_for_each_sg(sg, qc) {
flush_dcache_range(sg_dma_address(sg),
sg_dma_address(sg) + sg_dma_len(sg));
}
enable_dma(CH_ATAPI_TX);
pr_debug("enable udma write\n");
/* Send ATA DMA write command */
bfin_exec_command(ap, &qc->tf);
/* set ATA DMA write direction */
ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base)
| XFER_DIR));
} else {
enable_dma(CH_ATAPI_RX);
pr_debug("enable udma read\n");
/* Send ATA DMA read command */
bfin_exec_command(ap, &qc->tf);
/* 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 transfer length to buffer len */
ata_for_each_sg(sg, qc) {
ATAPI_SET_XFER_LEN(base, (sg_dma_len(sg) >> 1));
}
/* Enable ATA DMA operation*/
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;
struct scatterlist *sg;
pr_debug("in atapi dma stop\n");
if (!(ap->udma_mask || ap->mwdma_mask))
return;
/* stop ATAPI DMA controller*/
if (qc->tf.flags & ATA_TFLAG_WRITE)
disable_dma(CH_ATAPI_TX);
else {
disable_dma(CH_ATAPI_RX);
if (ap->hsm_task_state & HSM_ST_LAST) {
/*
* On blackfin arch, uncacheable memory is not
* allocated with flag GFP_DMA. DMA buffer from
* common kenel code should be invalidated if
* data cache is enabled. Otherwise, this loop
* is an empty loop and optimized out.
*/
ata_for_each_sg(sg, qc) {
invalidate_dcache_range(
sg_dma_address(sg),
sg_dma_address(sg)
+ sg_dma_len(sg));
}
}
}
}
/**
* 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_std_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().