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ssb: Fix PCMCIA-host lowlevel bus access 

This fixes the lowlevel bus access routines for
PCMCIA based devices.

There are still a few issues with register access sideeffects after
this patch. This will be addressed in a later patch.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Michael Buesch 2007-11-07 19:03:35 +01:00 committed by David S. Miller
parent d52a60ad38
commit 60d78c4473
2 changed files with 29 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/ssb/main.c
View File

@ -440,6 +440,7 @@ static int ssb_devices_register(struct ssb_bus *bus)
break;
case SSB_BUSTYPE_PCMCIA:
#ifdef CONFIG_SSB_PCMCIAHOST
sdev->irq = bus->host_pcmcia->irq.AssignedIRQ;
dev->parent = &bus->host_pcmcia->dev;
#endif
break;

56
drivers/ssb/pcmcia.c
View File

@ -63,17 +63,17 @@ int ssb_pcmcia_switch_coreidx(struct ssb_bus *bus,
err = pcmcia_access_configuration_register(pdev, &reg);
if (err != CS_SUCCESS)
goto error;
read_addr |= (reg.Value & 0xF) << 12;
read_addr |= ((u32)(reg.Value & 0x0F)) << 12;
reg.Offset = 0x30;
err = pcmcia_access_configuration_register(pdev, &reg);
if (err != CS_SUCCESS)
goto error;
read_addr |= reg.Value << 16;
read_addr |= ((u32)reg.Value) << 16;
reg.Offset = 0x32;
err = pcmcia_access_configuration_register(pdev, &reg);
if (err != CS_SUCCESS)
goto error;
read_addr |= reg.Value << 24;
read_addr |= ((u32)reg.Value) << 24;
cur_core = (read_addr - SSB_ENUM_BASE) / SSB_CORE_SIZE;
if (cur_core == coreidx)
@ -152,28 +152,29 @@ int ssb_pcmcia_switch_segment(struct ssb_bus *bus, u8 seg)
goto out_unlock;
}
/* These are the main device register access functions.
* do_select_core is inline to have the likely hotpath inline.
* All unlikely codepaths are out-of-line. */
static inline int do_select_core(struct ssb_bus *bus,
struct ssb_device *dev,
u16 *offset)
static int select_core_and_segment(struct ssb_device *dev,
u16 *offset)
{
struct ssb_bus *bus = dev->bus;
int err;
u8 need_seg = (*offset >= 0x800) ? 1 : 0;
u8 need_segment;
if (*offset >= 0x800) {
*offset -= 0x800;
need_segment = 1;
} else
need_segment = 0;
if (unlikely(dev != bus->mapped_device)) {
err = ssb_pcmcia_switch_core(bus, dev);
if (unlikely(err))
return err;
}
if (unlikely(need_seg != bus->mapped_pcmcia_seg)) {
err = ssb_pcmcia_switch_segment(bus, need_seg);
if (unlikely(need_segment != bus->mapped_pcmcia_seg)) {
err = ssb_pcmcia_switch_segment(bus, need_segment);
if (unlikely(err))
return err;
}
if (need_seg == 1)
*offset -= 0x800;
return 0;
}
@ -181,32 +182,31 @@ static inline int do_select_core(struct ssb_bus *bus,
static u16 ssb_pcmcia_read16(struct ssb_device *dev, u16 offset)
{
struct ssb_bus *bus = dev->bus;
u16 x;
if (unlikely(do_select_core(bus, dev, &offset)))
if (unlikely(select_core_and_segment(dev, &offset)))
return 0xFFFF;
x = readw(bus->mmio + offset);
return x;
return readw(bus->mmio + offset);
}
static u32 ssb_pcmcia_read32(struct ssb_device *dev, u16 offset)
{
struct ssb_bus *bus = dev->bus;
u32 x;
u32 lo, hi;
if (unlikely(do_select_core(bus, dev, &offset)))
if (unlikely(select_core_and_segment(dev, &offset)))
return 0xFFFFFFFF;
x = readl(bus->mmio + offset);
lo = readw(bus->mmio + offset);
hi = readw(bus->mmio + offset + 2);
return x;
return (lo | (hi << 16));
}
static void ssb_pcmcia_write16(struct ssb_device *dev, u16 offset, u16 value)
{
struct ssb_bus *bus = dev->bus;
if (unlikely(do_select_core(bus, dev, &offset)))
if (unlikely(select_core_and_segment(dev, &offset)))
return;
writew(value, bus->mmio + offset);
}
@ -215,12 +215,12 @@ static void ssb_pcmcia_write32(struct ssb_device *dev, u16 offset, u32 value)
{
struct ssb_bus *bus = dev->bus;
if (unlikely(do_select_core(bus, dev, &offset)))
if (unlikely(select_core_and_segment(dev, &offset)))
return;
readw(bus->mmio + offset);
writew(value >> 16, bus->mmio + offset + 2);
readw(bus->mmio + offset);
writew(value, bus->mmio + offset);
writeb((value & 0xFF000000) >> 24, bus->mmio + offset + 3);
writeb((value & 0x00FF0000) >> 16, bus->mmio + offset + 2);
writeb((value & 0x0000FF00) >> 8, bus->mmio + offset + 1);
writeb((value & 0x000000FF) >> 0, bus->mmio + offset + 0);
}
/* Not "static", as it's used in main.c */