diff options
Diffstat (limited to 'drivers/ata/pata_bf54x.c')
| -rw-r--r-- | drivers/ata/pata_bf54x.c | 1627 |
1 files changed, 1627 insertions, 0 deletions
diff --git a/drivers/ata/pata_bf54x.c b/drivers/ata/pata_bf54x.c new file mode 100644 index 00000000000..747549e4563 --- /dev/null +++ b/drivers/ata/pata_bf54x.c @@ -0,0 +1,1627 @@ +/* + * 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(). + */ + +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 timeout; + + /* if device 0 was found in ata_devchk, wait for its + * BSY bit to clear + */ + if (dev0) + ata_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 + */ + timeout = jiffies + ATA_TMOUT_BOOT; + while (dev1) { + u8 nsect, lbal; + + bfin_std_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, timeout)) { + dev1 = 0; + break; + } + msleep(50); /* give drive a breather */ + } + if (dev1) + ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT); + + /* is all this really necessary? */ + bfin_std_dev_select(ap, 0); + if (dev1) + bfin_std_dev_select(ap, 1); + if (dev0) + bfin_std_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 + */ + msleep(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_std_softreset - reset host port via ATA SRST + * @ap: port to reset + * @classes: resulting classes of attached devices + * + * Note: Original code is ata_std_softreset(). + */ + +static int bfin_std_softreset(struct ata_port *ap, unsigned int *classes, + unsigned long deadline) +{ + unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS; + unsigned int devmask = 0, err_mask; + u8 err; + + if (ata_port_offline(ap)) { + classes[0] = ATA_DEV_NONE; + goto out; + } + + /* 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_std_dev_select(ap, 0); + + /* issue bus reset */ + err_mask = bfin_bus_softreset(ap, devmask); + if (err_mask) { + ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n", + err_mask); + return -EIO; + } + + /* determine by signature whether we have ATA or ATAPI devices */ + classes[0] = ata_dev_try_classify(ap, 0, &err); + if (slave_possible && err != 0x81) + classes[1] = ata_dev_try_classify(ap, 1, &err); + + out: + 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) +{ |