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sata_promise: SATA hotplug support, take 2 

This patch enables hotplugging of SATA devices in the
sata_promise driver. It's been tested successfully on
both first- and second-generation Promise SATA chips:
SATA150 TX2plus, SATAII150 TX2plus, SATAII150 TX4,
SATA300 TX2plus, and SATA300 TX4.

The only quirk I've seen is that hotplugging (insertion)
on the first-generation SATA150 TX2plus requires a lengthier
EH sequence than on the second-generation chips.
On the second-generation chips a simple soft reset seems
to suffice, but on the first-generation chip there's a
"port is slow to respond" after the initial soft reset,
after which libata issues a hard reset, and then the
device is recognised.

The hotplug checks are high up in the interrupt handling
path, not deep down in error_intr as in ahci/sata_sil24.
That's because the chip doesn't signal hotplug status changes
in the per-port status register: instead a global register
contains hotplug control and status flags for all ports.
I considered following the ahci/sata_sil24 structure, but
that would have required non-trivial changes to the interrupt
handling path, so I chose to keep the hotplug changes simple
and unobtrusive.

Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
--
This patch depends on the "sata_promise: cleanups" patch.

Changes since the previous version (posted June 19):
- Correct pdc_interrupt() to increment 'handled' also in
  the hotplug case. This prevents IRQ_NONE from being
  returned when an interrupt only has hotplug events to
  handle, which could confuse the kernel's IRQ machinery.
- Added testing on the SATAII150 TX4.

 drivers/ata/sata_promise.c |   41 ++++++++++++++++++++++++++++++++++++-----
 1 files changed, 36 insertions(+), 5 deletions(-)
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Mikael Pettersson 2007-07-03 01:09:05 +02:00 committed by Jeff Garzik
parent 15ce09432a
commit a77720ad0a
1 changed files with 36 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
drivers/ata/sata_promise.c
View File

@ -45,7 +45,7 @@
#include "sata_promise.h"
#define DRV_NAME "sata_promise"
#define DRV_VERSION "2.08"
#define DRV_VERSION "2.09"
enum {
PDC_MAX_PORTS = 4,
@ -716,6 +716,9 @@ static irqreturn_t pdc_interrupt (int irq, void *dev_instance)
unsigned int i, tmp;
unsigned int handled = 0;
void __iomem *mmio_base;
unsigned int hotplug_offset, ata_no;
u32 hotplug_status;
int is_sataii_tx4;
VPRINTK("ENTER\n");
@ -726,10 +729,20 @@ static irqreturn_t pdc_interrupt (int irq, void *dev_instance)
mmio_base = host->iomap[PDC_MMIO_BAR];
/* read and clear hotplug flags for all ports */
if (host->ports[0]->flags & PDC_FLAG_GEN_II)
hotplug_offset = PDC2_SATA_PLUG_CSR;
else
hotplug_offset = PDC_SATA_PLUG_CSR;
hotplug_status = readl(mmio_base + hotplug_offset);
if (hotplug_status & 0xff)
writel(hotplug_status | 0xff, mmio_base + hotplug_offset);
hotplug_status &= 0xff; /* clear uninteresting bits */
/* reading should also clear interrupts */
mask = readl(mmio_base + PDC_INT_SEQMASK);
if (mask == 0xffffffff) {
if (mask == 0xffffffff && hotplug_status == 0) {
VPRINTK("QUICK EXIT 2\n");
return IRQ_NONE;
}
@ -737,16 +750,34 @@ static irqreturn_t pdc_interrupt (int irq, void *dev_instance)
spin_lock(&host->lock);
mask &= 0xffff; /* only 16 tags possible */
if (!mask) {
if (mask == 0 && hotplug_status == 0) {
VPRINTK("QUICK EXIT 3\n");
goto done_irq;
}
writel(mask, mmio_base + PDC_INT_SEQMASK);
is_sataii_tx4 = pdc_is_sataii_tx4(host->ports[0]->flags);
for (i = 0; i < host->n_ports; i++) {
VPRINTK("port %u\n", i);
ap = host->ports[i];
/* check for a plug or unplug event */
ata_no = pdc_port_no_to_ata_no(i, is_sataii_tx4);
tmp = hotplug_status & (0x11 << ata_no);
if (tmp && ap &&
!(ap->flags & ATA_FLAG_DISABLED)) {
struct ata_eh_info *ehi = &ap->eh_info;
ata_ehi_clear_desc(ehi);
ata_ehi_hotplugged(ehi);
ata_ehi_push_desc(ehi, "hotplug_status %#x", tmp);
ata_port_freeze(ap);
++handled;
continue;
}
/* check for a packet interrupt */
tmp = mask & (1 << (i + 1));
if (tmp && ap &&
!(ap->flags & ATA_FLAG_DISABLED)) {
@ -902,9 +933,9 @@ static void pdc_host_init(struct ata_host *host)
tmp = readl(mmio + hotplug_offset);
writel(tmp | 0xff, mmio + hotplug_offset);
/* mask plug/unplug ints */
/* unmask plug/unplug ints */
tmp = readl(mmio + hotplug_offset);
writel(tmp | 0xff0000, mmio + hotplug_offset);
writel(tmp & ~0xff0000, mmio + hotplug_offset);
/* don't initialise TBG or SLEW on 2nd generation chips */
if (is_gen2)