This crude but simple patch enables hotplugging of SATA
disks in the sata_promise driver. Tested successfully on
SATAII150 TX2plus, SATA300 TX2plus, and SATA300 TX4.
The TX4 is significant because of the port_nr-to-ata_nr
remapping that occurs for those chips, which affects
the hotplug status change check for a given port.
While this patch works for me, I consider it preliminary
because it duplicates code and open-codes stuff, so some
cleanups are certainly needed. Also I haven't been able
to test it on first-generation chips yet.
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.
/Mikael
(not a formal patch submission, hence no signed-off line)
--- linux-2.6.22-rc5/drivers/ata/sata_promise.c.~1~ 2007-06-17
22:03:46.000000000 +0200
+++ linux-2.6.22-rc5/drivers/ata/sata_promise.c 2007-06-17 23:43:51.000000000
+0200
@@ -709,6 +709,9 @@
unsigned int i, tmp;
unsigned int handled = 0;
void __iomem *mmio_base;
+ unsigned int hotplug_offset;
+ u32 hotplug_status;
+ int is_sataii_tx4;
VPRINTK("ENTER\n");
@@ -719,10 +722,22 @@
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);
+ printk("%s: hotplug_status %#x\n", __FUNCTION__,
hotplug_status);
+ }
+ 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;
}
@@ -730,16 +745,39 @@
spin_lock(&host->lock);
mask &= 0xffff; /* only 16 tags possible */
- if (!mask) {
+ if (!mask && hotplug_status == 0) {
VPRINTK("QUICK EXIT 3\n");
goto done_irq;
}
writel(mask, mmio_base + PDC_INT_SEQMASK);
+ /* XXX: ugly ugly ugly */
+ is_sataii_tx4 = 0;
+ if ((host->ports[0]->flags & (PDC_FLAG_GEN_II|PDC_FLAG_4_PORTS)) ==
+ (PDC_FLAG_GEN_II|PDC_FLAG_4_PORTS))
+ is_sataii_tx4 = 1;
+
for (i = 0; i < host->n_ports; i++) {
VPRINTK("port %u\n", i);
ap = host->ports[i];
+ {
+ static const unsigned char sataii_tx4_port_remap[4] = {
3, 1, 0, 2};
+ int ata_nr = i;
+
+ if (is_sataii_tx4)
+ ata_nr = sataii_tx4_port_remap[i];
+
+ if ((hotplug_status & (0x11 << ata_nr)) && 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",
hotplug_status);
+ ata_port_freeze(ap);
+ continue;
+ }
+ }
tmp = mask & (1 << (i + 1));
if (tmp && ap &&
!(ap->flags & ATA_FLAG_DISABLED)) {
@@ -897,9 +935,9 @@
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)
-
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