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>

1 files changed, 36 insertions, 5 deletions

diff --git a/drivers/ata/sata_promise.c b/drivers/ata/sata_promise.c
index 2ad5872fe90c..d2fcb9a6bec2 100644
--- a/drivers/ata/sata_promise.c
+++ b/drivers/ata/sata_promise.c
@@ -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)