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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2010-01-18 07:17:37 +0000
committerDavid S. Miller <davem@davemloft.net>2010-01-19 01:24:56 -0800
commit3c8cc8df5a67a539cd185026e6b6f49b576869ba (patch)
treea2c042b8768ee08d5f99cd711698a237c6ccdebb /drivers/ide/alim15x3.c
parent2b7d03a5cdace237525643d48918e68fe24681ed (diff)
alim15x3: fix PIO timings calculations
Just use the standard ide_timing_compute() helper to calculate PIO timings. This fixes many issues with the open-coded version like potential recovery timings underclocking or not accounting for the enhanced cycle time specified by the device. Based on libata pata_ali host driver. Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/ide/alim15x3.c')
-rw-r--r--drivers/ide/alim15x3.c34
1 files changed, 15 insertions, 19 deletions
diff --git a/drivers/ide/alim15x3.c b/drivers/ide/alim15x3.c
index 0abc43f3101e..99c355e87850 100644
--- a/drivers/ide/alim15x3.c
+++ b/drivers/ide/alim15x3.c
@@ -8,7 +8,7 @@
* Copyright (C) 2002 Alan Cox
* ALi (now ULi M5228) support by Clear Zhang <Clear.Zhang@ali.com.tw>
* Copyright (C) 2007 MontaVista Software, Inc. <source@mvista.com>
- * Copyright (C) 2007 Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
+ * Copyright (C) 2007-2010 Bartlomiej Zolnierkiewicz
*
* (U)DMA capable version of ali 1533/1543(C), 1535(D)
*
@@ -60,28 +60,22 @@ static void ali_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
ide_hwif_t *hwif = drive->hwif;
struct pci_dev *dev = to_pci_dev(hwif->dev);
- struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
- int s_time = t->setup, a_time = t->active, c_time = t->cycle;
- u8 s_clc, a_clc, r_clc;
unsigned long flags;
int bus_speed = ide_pci_clk ? ide_pci_clk : 33;
+ unsigned long T = 1000000 / bus_speed; /* PCI clock based */
int port = hwif->channel ? 0x5c : 0x58;
int portFIFO = hwif->channel ? 0x55 : 0x54;
u8 cd_dma_fifo = 0, unit = drive->dn & 1;
+ struct ide_timing t;
- if ((s_clc = (s_time * bus_speed + 999) / 1000) >= 8)
- s_clc = 0;
- if ((a_clc = (a_time * bus_speed + 999) / 1000) >= 8)
- a_clc = 0;
+ ide_timing_compute(drive, XFER_PIO_0 + pio, &t, T, 1);
+
+ t.setup = clamp_val(t.setup, 1, 8) & 7;
+ t.active = clamp_val(t.active, 1, 8) & 7;
+ t.recover = clamp_val(t.recover, 1, 16) & 15;
- if (!(r_clc = (c_time * bus_speed + 999) / 1000 - a_clc - s_clc)) {
- r_clc = 1;
- } else {
- if (r_clc >= 16)
- r_clc = 0;
- }
local_irq_save(flags);
-
+
/*
* PIO mode => ATA FIFO on, ATAPI FIFO off
*/
@@ -99,9 +93,11 @@ static void ali_set_pio_mode(ide_drive_t *drive, const u8 pio)
pci_write_config_byte(dev, portFIFO, cd_dma_fifo & 0xF0);
}
}
-
- pci_write_config_byte(dev, port, s_clc);
- pci_write_config_byte(dev, port + unit + 2, (a_clc << 4) | r_clc);
+
+ pci_write_config_byte(dev, port, t.setup);
+ pci_write_config_byte(dev, port + unit + 2,
+ (t.active << 4) | t.recover);
+
local_irq_restore(flags);
}
@@ -584,6 +580,6 @@ static void __exit ali15x3_ide_exit(void)
module_init(ali15x3_ide_init);
module_exit(ali15x3_ide_exit);
-MODULE_AUTHOR("Michael Aubry, Andrzej Krzysztofowicz, CJ, Andre Hedrick, Alan Cox");
+MODULE_AUTHOR("Michael Aubry, Andrzej Krzysztofowicz, CJ, Andre Hedrick, Alan Cox, Bartlomiej Zolnierkiewicz");
MODULE_DESCRIPTION("PCI driver module for ALi 15x3 IDE");
MODULE_LICENSE("GPL");