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palm_bk3710: those registers/bitfields don't exist

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Bugfixes noted by checking the code against the controller
documentation (TI document number SPRUE21):

 - Remove declarations for eight non-existent registers (!);
   and remove accesses to two of them.

 - Remove access to various non-existent bitfields in some of
   the registers which *do* exist (those fields must-be-zero).

 - Provide comment to replace bogus reset logic (removed above,
   it relied on non-existent bitfields).  Resets require GPIO
   help; this driver doesn't currently know about that.

With some minor cleanup:  relocate a comment, avoid an extra
lookup of the PIO timings.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
David Brownell 2009-04-23 22:53:43 +02:00 committed by Bartlomiej Zolnierkiewicz
parent 83cff83926
commit 33e86019f7
1 changed files with 18 additions and 49 deletions
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67
drivers/ide/palm_bk3710.c
View File

@ -42,16 +42,9 @@
#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
@ -63,7 +56,6 @@
#define BK3710_UDMATRP 0x70
#define BK3710_UDMAENV 0x74
#define BK3710_IORDYTMP 0x78
#define BK3710_IORDYTMS 0x7C
static unsigned ideclk_period; /* in nanoseconds */
@ -96,11 +88,6 @@ static void palm_bk3710_setudmamode(void __iomem *base, unsigned int dev,
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));
@ -161,10 +148,11 @@ static void palm_bk3710_setpiomode(void __iomem *base, ide_drive_t *mate,
u32 val32;
struct ide_timing *t;
t = ide_timing_find_mode(XFER_PIO_0 + mode);
/* 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);
t2 = DIV_ROUND_UP(t->active, ideclk_period);
t2i = t0 - t2 - 1;
t2 -= 1;
@ -185,7 +173,6 @@ static void palm_bk3710_setpiomode(void __iomem *base, ide_drive_t *mate,
}
/* 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);
@ -234,42 +221,23 @@ static void palm_bk3710_set_pio_mode(ide_drive_t *drive, u8 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.
* REVISIT: the ATA reset signal needs to be managed through a
* GPIO, which means it should come from platform_data. Until
* we get and use such information, we have to trust that things
* have been reset before we get here.
*/
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)
*
* DM6446 silicon rev 2.1 and earlier have no observed net benefit
* from enabling prefetch/postwrite.
*/
writew(0xB388, base + BK3710_IDETIMP);
/*
* Configure SIDETIM Register
* (ATA_SIDETIM_RDYSMPS1 ,120NS ) |
* (ATA_SIDETIM_RDYRCYS1 ,120NS )
*/
writeb(0, base + BK3710_SIDETIM);
writew(BIT(15), base + BK3710_IDETIMP);
/*
* UDMACTL Ultra-ATA DMA Control
@ -281,11 +249,11 @@ static void __devinit palm_bk3710_chipinit(void __iomem *base)
/*
* MISCCTL Miscellaneous Conrol Register
* (ATA_MISCCTL_RSTMODEP , 1) |
* (ATA_MISCCTL_RESETP , 0) |
* (ATA_MISCCTL_HWNHLD1P , 1 cycle)
* (ATA_MISCCTL_HWNHLD0P , 1 cycle)
* (ATA_MISCCTL_TIMORIDE , 1)
*/
writel(0x201, base + BK3710_MISCCTL);
writel(0x001, base + BK3710_MISCCTL);
/*
* IORDYTMP IORDY Timer for Primary Register
@ -355,10 +323,9 @@ static int __init palm_bk3710_probe(struct platform_device *pdev)
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));
/* NOTE: round *down* to meet minimum timings; we count in clocks */
ideclk_period = 1000000000UL / rate;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (mem == NULL) {
@ -388,6 +355,7 @@ static int __init palm_bk3710_probe(struct platform_device *pdev)
/* Configure the Palm Chip controller */
palm_bk3710_chipinit(base);
memset(&hw, 0, sizeof(hw));
for (i = 0; i < IDE_NR_PORTS - 2; i++)
hw.io_ports_array[i] = (unsigned long)
(base + IDE_PALM_ATA_PRI_REG_OFFSET + i);
@ -400,6 +368,7 @@ static int __init palm_bk3710_probe(struct platform_device *pdev)
palm_bk3710_port_info.udma_mask = rate < 100000000 ? ATA_UDMA4 :
ATA_UDMA5;
/* Register the IDE interface with Linux */
rc = ide_host_add(&palm_bk3710_port_info, hws, NULL);
if (rc)
goto out;