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/*
* Palmchip bk3710 IDE controller
*
* Copyright (C) 2006 Texas Instruments.
* Copyright (C) 2007 MontaVista Software, Inc., <source@mvista.com>
*
* ----------------------------------------------------------------------------
*
* 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
* ----------------------------------------------------------------------------
*
*/
#include <linux/types.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/ide.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
/* Offset of the primary interface registers */
#define IDE_PALM_ATA_PRI_REG_OFFSET 0x1F0
/* Primary Control Offset */
#define IDE_PALM_ATA_PRI_CTL_OFFSET 0x3F6
/*
* PalmChip 3710 IDE Controller UDMA timing structure Definition
*/
struct palm_bk3710_udmatiming {
unsigned int rptime; /* Ready to pause time */
unsigned int cycletime; /* Cycle Time */
};
#define BK3710_BMICP 0x00
#define BK3710_BMISP 0x02
#define BK3710_BMIDTP 0x04
#define BK3710_BMICS 0x08
#define BK3710_BMISS 0x0A
#define BK3710_BMIDTS 0x0C
#define BK3710_IDETIMP 0x40
#define BK3710_IDETIMS 0x42
#define BK3710_SIDETIM 0x44
#define BK3710_SLEWCTL 0x45
#define BK3710_IDESTATUS 0x47
#define BK3710_UDMACTL 0x48
#define BK3710_UDMATIM 0x4A
#define BK3710_MISCCTL 0x50
#define BK3710_REGSTB 0x54
#define BK3710_REGRCVR 0x58
#define BK3710_DATSTB 0x5C
#define BK3710_DATRCVR 0x60
#define BK3710_DMASTB 0x64
#define BK3710_DMARCVR 0x68
#define BK3710_UDMASTB 0x6C
#define BK3710_UDMATRP 0x70
#define BK3710_UDMAENV 0x74
#define BK3710_IORDYTMP 0x78
#define BK3710_IORDYTMS 0x7C
static unsigned ideclk_period; /* in nanoseconds */
static const struct palm_bk3710_udmatiming palm_bk3710_udmatimings[6] = {
{160, 240}, /* UDMA Mode 0 */
{125, 160}, /* UDMA Mode 1 */
{100, 120}, /* UDMA Mode 2 */
{100, 90}, /* UDMA Mode 3 */
{100, 60}, /* UDMA Mode 4 */
{85, 40}, /* UDMA Mode 5 */
};
static void palm_bk3710_setudmamode(void __iomem *base, unsigned int dev,
unsigned int mode)
{
u8 tenv, trp, t0;
u32 val32;
u16 val16;
/* DMA Data Setup */
t0 = DIV_ROUND_UP(palm_bk3710_udmatimings[mode].cycletime,
ideclk_period) - 1;
tenv = DIV_ROUND_UP(20, ideclk_period) - 1;
trp = DIV_ROUND_UP(palm_bk3710_udmatimings[mode].rptime,
ideclk_period) - 1;
/* udmatim Register */
val16 = readw(base + BK3710_UDMATIM) & (dev ? 0xFF0F : 0xFFF0);
val16 |= (mode << (dev ? 4 : 0));
writew(val16, base + BK3710_UDMATIM);
/* udmastb Ultra DMA Access Strobe Width */
val32 = readl(base + BK3710_UDMASTB) & (0xFF << (dev ? 0 : 8));
val32 |= (t0 << (dev ? 8 : 0));
writel(val32, base + BK3710_UDMASTB);
/* udmatrp Ultra DMA Ready to Pause Time */
val32 = readl(base + BK3710_UDMATRP) & (0xFF << (dev ? 0 : 8));
val32 |= (trp << (dev ? 8 : 0));
writel(val32, base + BK3710_UDMATRP);
/* udmaenv Ultra DMA envelop Time */
val32 = readl(base + BK3710_UDMAENV) & (0xFF << (dev ? 0 : 8));
val32 |= (tenv << (dev ? 8 : 0));
writel(val32, base + BK3710_UDMAENV);
/* Enable UDMA for Device */
val16 = readw(base + BK3710_UDMACTL) | (1 << dev);
writew(val16, base + BK3710_UDMACTL);
}
static void palm_bk3710_setdmamode(void __iomem *base, unsigned int dev,
unsigned short min_cycle,
unsigned int mode)
{
u8 td, tkw, t0;
u32 val32;
u16 val16;
struct ide_timing *t;
int cycletime;
t = ide_timing_find_mode(mode);
cycletime = max_t(int, t->cycle, min_cycle);
/* DMA Data Setup */
t0 = DIV_ROUND_UP(cycletime, ideclk_period);
td = DIV_ROUND_UP(t->active, ideclk_period);
tkw = t0 - td - 1;
td -= 1;
val32 = readl(base + BK3710_DMASTB) & (0xFF << (dev ? 0 : 8));
val32 |= (td << (dev ? 8 : 0));
writel(val32, base + BK3710_DMASTB);
val32 = readl(base + BK3710_DMARCVR) & (0xFF << (dev ? 0 : 8));
val32 |= (tkw << (dev ? 8 : 0));
writel(val32, base + BK3710_DMARCVR);
/* Disable UDMA for Device */
val16 = readw(base + BK3710_UDMACTL) & ~(1 << dev);
writew(val16, base + BK3710_UDMACTL);
}
static void palm_bk3710_setpiomode(void __iomem *base, ide_drive_t *mate,
unsigned int dev, unsigned int cycletime,
unsigned int mode)
{
u8 t2, t2i, t0;
u32 val32;
struct ide_timing *t;
/* PIO Data Setup */
t0 = DIV_ROUND_UP(cycletime, ideclk_period);
t2 = DIV_ROUND_UP(ide_timing_find_mode(XFER_PIO_0 + mode)->active,
ideclk_period);
t2i = t0 - t2 - 1;
t2 -= 1;
val32 = readl(base + BK3710_DATSTB) & (0xFF << (dev ? 0 : 8));
val32 |= (t2 << (dev ? 8 : 0));
writel(val32, base + BK3710_DATSTB);
val32 = readl(base + BK3710_DATRCVR) & (0xFF << (dev ? 0 : 8));
val32 |= (t2i << (dev ? 8 : 0));
writel(val32, base + BK3710_DATRCVR);
if (mate) {
u8 mode2 = ide_get_best_pio_mode(mate, 255, 4);
if (mode2 < mode)
mode = mode2;
}
/* TASKFILE Setup */
t = ide_timing_find_mode(XFER_PIO_0 + mode);
t0 = DIV_ROUND_UP(t->cyc8b, ideclk_period);
t2 = DIV_ROUND_UP(t->act8b, ideclk_period);
t2i = t0 - t2 - 1;
t2 -= 1;
val32 = readl(base + BK3710_REGSTB) & (0xFF << (dev ? 0 : 8));
val32 |= (t2 << (dev ? 8 : 0));
writel(val32, base + BK3710_REGSTB);
val32 = readl(base + BK3710_REGRCVR) & (0xFF << (dev ? 0 : 8));
val32 |= (t2i << (dev ? 8 : 0));
writel(val32, base + BK3710_REGRCVR);
}
static void palm_bk3710_set_dma_mode(ide_drive_t *drive, u8 xferspeed)
{
int is_slave = drive->dn & 1;
void __iomem *base = (void *)drive->hwif->dma_base;
if (xferspeed >= XFER_UDMA_0) {
palm_bk3710_setudmamode(base, is_slave,
xferspeed - XFER_UDMA_0);
} else {
palm_bk3710_setdmamode(base, is_slave,
drive->id[ATA_ID_EIDE_DMA_MIN],
xferspeed);
}
}
static void palm_bk3710_set_pio_mode(ide_drive_t *drive, u8 pio)
{
unsigned int cycle_time;
int is_slave = drive->dn &
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