sh: hook in struct pci_channel in sysdata

Store a struct pci_channel pointer in bus->sysdata. This makes whatever
struct pci_channel assigned to a bus available for sh4_pci_read() and
sh4_pci_write(). We also modify PCIBIOS_MIN_IO and PCIBIOS_MIN_MEM to
use bus->sysdata - this to gives us support for multiple pci channels.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/drivers/pci/ops-sh4.c

@@ -26,6 +26,7 @@ static DEFINE_SPINLOCK(sh4_pci_lock);
 static int sh4_pci_read(struct pci_bus *bus, unsigned int devfn,
 			   int where, int size, u32 *val)
 {
+	struct pci_channel *chan = bus->sysdata;
 	unsigned long flags;
 	u32 data;
 
@@ -34,8 +35,8 @@ static int sh4_pci_read(struct pci_bus *bus, unsigned int devfn,
 	 * so we must do byte alignment by hand
 	 */
 	spin_lock_irqsave(&sh4_pci_lock, flags);
-	pci_write_reg(NULL, CONFIG_CMD(bus, devfn, where), SH4_PCIPAR);
-	data = pci_read_reg(NULL, SH4_PCIPDR);
+	pci_write_reg(chan, CONFIG_CMD(bus, devfn, where), SH4_PCIPAR);
+	data = pci_read_reg(chan, SH4_PCIPDR);
 	spin_unlock_irqrestore(&sh4_pci_lock, flags);
 
 	switch (size) {
@@ -63,13 +64,14 @@ static int sh4_pci_read(struct pci_bus *bus, unsigned int devfn,
 static int sh4_pci_write(struct pci_bus *bus, unsigned int devfn,
 			 int where, int size, u32 val)
 {
+	struct pci_channel *chan = bus->sysdata;
 	unsigned long flags;
 	int shift;
 	u32 data;
 
 	spin_lock_irqsave(&sh4_pci_lock, flags);
-	pci_write_reg(NULL, CONFIG_CMD(bus, devfn, where), SH4_PCIPAR);
-	data = pci_read_reg(NULL, SH4_PCIPDR);
+	pci_write_reg(chan, CONFIG_CMD(bus, devfn, where), SH4_PCIPAR);
+	data = pci_read_reg(chan, SH4_PCIPDR);
 	spin_unlock_irqrestore(&sh4_pci_lock, flags);
 
 	switch (size) {
@@ -90,7 +92,7 @@ static int sh4_pci_write(struct pci_bus *bus, unsigned int devfn,
 		return PCIBIOS_FUNC_NOT_SUPPORTED;
 	}
 
-	pci_write_reg(NULL, data, SH4_PCIPDR);
+	pci_write_reg(chan, data, SH4_PCIPDR);
 
 	return PCIBIOS_SUCCESSFUL;
 }

arch/sh/drivers/pci/pci-auto.c

@@ -67,6 +67,7 @@ static struct pci_dev *fake_pci_dev(struct pci_channel *hose,
 	dev.devfn = devfn;
 	bus.number = busnr;
 	bus.ops = hose->pci_ops;
+	bus.sysdata = hose;
 
 	if(busnr != top_bus)
 		/* Fake a parent bus structure. */

arch/sh/include/asm/pci.h

@@ -31,8 +31,10 @@ struct pci_channel {
  */
 extern struct pci_channel board_pci_channels[];
 
-#define PCIBIOS_MIN_IO		board_pci_channels->io_resource->start
-#define PCIBIOS_MIN_MEM		board_pci_channels->mem_resource->start
+/* ugly as hell, but makes drivers/pci/setup-res.c compile and work */
+#define __PCI_CHAN(bus)		((struct pci_channel *)bus->sysdata)
+#define PCIBIOS_MIN_IO		__PCI_CHAN(bus)->io_resource->start
+#define PCIBIOS_MIN_MEM		__PCI_CHAN(bus)->mem_resource->start
 
 /*
  * I/O routine helpers