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kernel_optimize_test/drivers/ide/palm_bk3710.c
David Brownell db2f38c22e palm_bk3710: UDMA performance fix 
Fix UDMA throughput bug:  tCYC averages t2CYCTYP/2, but the code
previously assumed it was the same as t2CYCTYP.  (That is, it was
using just one clock edge, not both.)  Move the table's type
declaration so it's adjacent to the table, making it more clear
what those numbers mean.

On one system this change increased throughput by almost 4x: UDMA/66
sometimes topped 23 MB/sec (on a drive known to do much better).  On
another system it was around a 10% win (UDMA/66 up to 7+ MB/sec).

The difference might be caused by the ratio between memory and IDE
clocks.  In the system with large speedup, this was exactly 2 (as a
workaround for a rev 1.1 silicon bug).  The other system used a more
standard ratio of 1.63 (and rev 2.1 silicon) ... clock domain synch
might have some issues, they're not unheard-of.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2009-04-22 20:33:40 +02:00

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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
#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 */
struct palm_bk3710_udmatiming {
unsigned int rptime; /* tRP -- Ready to pause time (nsec) */
unsigned int cycletime; /* tCYCTYP2/2 -- avg Cycle Time (nsec) */
/* tENV is always a minimum of 20 nsec */
};
static const struct palm_bk3710_udmatiming palm_bk3710_udmatimings[6] = {
{160, 240 / 2,}, /* UDMA Mode 0 */
{125, 160 / 2,}, /* UDMA Mode 1 */
{100, 120 / 2,}, /* UDMA Mode 2 */
{100, 90 / 2,}, /* UDMA Mode 3 */
{100, 60 / 2,}, /* UDMA Mode 4 */
{85, 40 / 2,}, /* 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 & 1;
ide_drive_t *mate;
void __iomem *base = (void *)drive->hwif->dma_base;
/*
* Obtain the drive PIO data for tuning the Palm Chip registers
*/
cycle_time = ide_pio_cycle_time(drive, pio);
mate = ide_get_pair_dev(drive);
palm_bk3710_setpiomode(base, mate, is_slave, cycle_time, pio);
}
static void __devinit palm_bk3710_chipinit(void __iomem *base)
{
/*
* enable the reset_en of ATA controller so that when ata signals
* are brought out, by writing into device config. at that
* time por_n signal should not be 'Z' and have a stable value.
*/
writel(0x0300, base + BK3710_MISCCTL);
/* wait for some time and deassert the reset of ATA Device. */
mdelay(100);
/* Deassert the Reset */
writel(0x0200, base + BK3710_MISCCTL);
/*
* Program the IDETIMP Register Value based on the following assumptions
*
* (ATA_IDETIMP_IDEEN , ENABLE ) |
* (ATA_IDETIMP_SLVTIMEN , DISABLE) |
* (ATA_IDETIMP_RDYSMPL , 70NS) |
* (ATA_IDETIMP_RDYRCVRY , 50NS) |
* (ATA_IDETIMP_DMAFTIM1 , PIOCOMP) |
* (ATA_IDETIMP_PREPOST1 , DISABLE) |
* (ATA_IDETIMP_RDYSEN1 , DISABLE) |
* (ATA_IDETIMP_PIOFTIM1 , DISABLE) |
* (ATA_IDETIMP_DMAFTIM0 , PIOCOMP) |
* (ATA_IDETIMP_PREPOST0 , DISABLE) |
* (ATA_IDETIMP_RDYSEN0 , DISABLE) |
* (ATA_IDETIMP_PIOFTIM0 , DISABLE)
*/
writew(0xB388, base + BK3710_IDETIMP);
/*
* Configure SIDETIM Register
* (ATA_SIDETIM_RDYSMPS1 ,120NS ) |
* (ATA_SIDETIM_RDYRCYS1 ,120NS )
*/
writeb(0, base + BK3710_SIDETIM);
/*
* UDMACTL Ultra-ATA DMA Control
* (ATA_UDMACTL_UDMAP1 , 0 ) |
* (ATA_UDMACTL_UDMAP0 , 0 )
*
*/
writew(0, base + BK3710_UDMACTL);
/*
* MISCCTL Miscellaneous Conrol Register
* (ATA_MISCCTL_RSTMODEP , 1) |
* (ATA_MISCCTL_RESETP , 0) |
* (ATA_MISCCTL_TIMORIDE , 1)
*/
writel(0x201, base + BK3710_MISCCTL);
/*
* IORDYTMP IORDY Timer for Primary Register
* (ATA_IORDYTMP_IORDYTMP , 0xffff )
*/
writel(0xFFFF, base + BK3710_IORDYTMP);
/*
* Configure BMISP Register
* (ATA_BMISP_DMAEN1 , DISABLE ) |
* (ATA_BMISP_DMAEN0 , DISABLE ) |
* (ATA_BMISP_IORDYINT , CLEAR) |
* (ATA_BMISP_INTRSTAT , CLEAR) |
* (ATA_BMISP_DMAERROR , CLEAR)
*/
writew(0, base + BK3710_BMISP);
palm_bk3710_setpiomode(base, NULL, 0, 600, 0);
palm_bk3710_setpiomode(base, NULL, 1, 600, 0);
}
static u8 palm_bk3710_cable_detect(ide_hwif_t *hwif)
{
return ATA_CBL_PATA80;
}
static int __devinit palm_bk3710_init_dma(ide_hwif_t *hwif,
const struct ide_port_info *d)
{
printk(KERN_INFO " %s: MMIO-DMA\n", hwif->name);
if (ide_allocate_dma_engine(hwif))
return -1;
hwif->dma_base = hwif->io_ports.data_addr - IDE_PALM_ATA_PRI_REG_OFFSET;
return 0;
}
static const struct ide_port_ops palm_bk3710_ports_ops = {
.set_pio_mode = palm_bk3710_set_pio_mode,
.set_dma_mode = palm_bk3710_set_dma_mode,
.cable_detect = palm_bk3710_cable_detect,
};
static struct ide_port_info __devinitdata palm_bk3710_port_info = {
.init_dma = palm_bk3710_init_dma,
.port_ops = &palm_bk3710_ports_ops,
.dma_ops = &sff_dma_ops,
.host_flags = IDE_HFLAG_MMIO,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
};
static int __init palm_bk3710_probe(struct platform_device *pdev)
{
struct clk *clk;
struct resource *mem, *irq;
void __iomem *base;
unsigned long rate, mem_size;
int i, rc;
hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
clk = clk_get(&pdev->dev, "IDECLK");
if (IS_ERR(clk))
return -ENODEV;
clk_enable(clk);
rate = clk_get_rate(clk);
ideclk_period = 1000000000UL / rate;
/* Register the IDE interface with Linux ATA Interface */
memset(&hw, 0, sizeof(hw));
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (mem == NULL) {
printk(KERN_ERR "failed to get memory region resource\n");
return -ENODEV;
}
irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (irq == NULL) {
printk(KERN_ERR "failed to get IRQ resource\n");
return -ENODEV;
}
mem_size = mem->end - mem->start + 1;
if (request_mem_region(mem->start, mem_size, "palm_bk3710") == NULL) {
printk(KERN_ERR "failed to request memory region\n");
return -EBUSY;
}
base = ioremap(mem->start, mem_size);
if (!base) {
printk(KERN_ERR "failed to map IO memory\n");
release_mem_region(mem->start, mem_size);
return -ENOMEM;
}
/* Configure the Palm Chip controller */
palm_bk3710_chipinit(base);
for (i = 0; i < IDE_NR_PORTS - 2; i++)
hw.io_ports_array[i] = (unsigned long)
(base + IDE_PALM_ATA_PRI_REG_OFFSET + i);
hw.io_ports.ctl_addr = (unsigned long)
(base + IDE_PALM_ATA_PRI_CTL_OFFSET);
hw.irq = irq->start;
hw.dev = &pdev->dev;
hw.chipset = ide_palm3710;
palm_bk3710_port_info.udma_mask = rate < 100000000 ? ATA_UDMA4 :
ATA_UDMA5;
rc = ide_host_add(&palm_bk3710_port_info, hws, NULL);
if (rc)
goto out;
return 0;
out:
printk(KERN_WARNING "Palm Chip BK3710 IDE Register Fail\n");
return rc;
}
/* work with hotplug and coldplug */
MODULE_ALIAS("platform:palm_bk3710");
static struct platform_driver platform_bk_driver = {
.driver = {
.name = "palm_bk3710",
.owner = THIS_MODULE,
},
};
static int __init palm_bk3710_init(void)
{
return platform_driver_probe(&platform_bk_driver, palm_bk3710_probe);
}
module_init(palm_bk3710_init);
MODULE_LICENSE("GPL");
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