cleanup PCI controller code

At some point we should make the ADM5120 PCI controller driver a real
platform driver and share that one between the two targets.

Signed-off-by: Florian Fainelli <florian@openwrt.org>

SVN-Revision: 34553

4 files changed, 203 insertions, 174 deletions

diff --git a/target/linux/adm8668/files/arch/mips/adm8668/Makefile b/target/linux/adm8668/files/arch/mips/adm8668/Makefile
index aff789c..e443f68 100644
--- a/target/linux/adm8668/files/arch/mips/adm8668/Makefile
+++ b/target/linux/adm8668/files/arch/mips/adm8668/Makefile
@@ -2,6 +2,6 @@
 # something witty  --neutronscott
 #
 
-obj-y	 	:= irq.o pci.o prom.o platform.o proc.o \
+obj-y	 	:= irq.o prom.o platform.o proc.o \
 		   setup.o clock.o time.o early_printk.o \
 		   net_core.o net_intr.o
diff --git a/target/linux/adm8668/files/arch/mips/adm8668/pci.c b/target/linux/adm8668/files/arch/mips/adm8668/pci.c
deleted file mode 100644
index 2bf1192..0000000
--- a/target/linux/adm8668/files/arch/mips/adm8668/pci.c
+++ /dev/null
@@ -1,171 +0,0 @@
-/*
- * Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/pci.h>
-#include <linux/types.h>
-#include <asm/byteorder.h>
-#include <asm/pci.h>
-#include <adm8668.h>
-
-volatile u32* pci_config_address_reg = (volatile u32*)KSEG1ADDR(PCICFG_BASE);
-volatile u32* pci_config_data_reg = (volatile u32*)KSEG1ADDR(PCIDAT_BASE);
-
-#define PCI_ENABLE			0x80000000
-#define	ADMPCI_IO_BASE			0x12600000
-#define	ADMPCI_IO_SIZE			0x1fffff
-#define	ADMPCI_MEM_BASE			0x16000000
-#define	ADMPCI_MEM_SIZE			0x7ffffff
-#define PCI_CMM_IOACC_EN		0x1
-#define PCI_CMM_MEMACC_EN		0x2
-#define PCI_CMM_MASTER_EN		0x4
-#define PCI_CMM_DEF			(PCI_CMM_IOACC_EN | PCI_CMM_MEMACC_EN | PCI_CMM_MASTER_EN)
-
-#define PCI_DEF_CACHE_LINE_SZ	0
-#define PCI_DEF_LATENCY_TIMER	0x20
-#define PCI_DEF_CACHE_LATENCY	((PCI_DEF_LATENCY_TIMER << 8) | PCI_DEF_CACHE_LINE_SZ)
-
-
-#define cfgaddr(bus, devfn, where)	(	\
-				(bus ? ((bus->number & 0xff) << 0x10) : 0) | \
-					 ((devfn & 0xff) << 0x08) | \
-					 (where & 0xfc)) | PCI_ENABLE
-
-/* assumed little endian */
-static int adm8668_read_config(struct pci_bus *bus, unsigned int devfn,
-				int where, int size, u32 *val)
-{
-    	switch (size)
-	{
-	case 1:
-		*pci_config_address_reg = cfgaddr(bus, devfn, where);
-		*val = (le32_to_cpu(*pci_config_data_reg) >> ((where&3)<<3)) & 0xff;
-		break;
-	case 2:
-		if (where & 1)
-			return PCIBIOS_BAD_REGISTER_NUMBER;
-		*pci_config_address_reg = cfgaddr(bus, devfn, where);
-		*val = (le32_to_cpu(*pci_config_data_reg) >> ((where&3)<<3)) & 0xffff;
-		break;
-	case 4:
-		if (where & 3)
-			return PCIBIOS_BAD_REGISTER_NUMBER;
-		*pci_config_address_reg = cfgaddr(bus, devfn, where);
-		*val = le32_to_cpu(*pci_config_data_reg);
-		break;
-	}
-
-	return PCIBIOS_SUCCESSFUL;
-}
-
-static int adm8668_write_config(struct pci_bus *bus, unsigned int devfn,
-				int where, int size, u32 val)
-{
-	switch (size)
-	{
-	case 1:
-		*pci_config_address_reg = cfgaddr(bus, devfn, where);
-		*(volatile u8 *)(((int)pci_config_data_reg) + (where & 3)) = val;
-		break;
-	case 2:
-		if (where & 1)
-			return PCIBIOS_BAD_REGISTER_NUMBER;
-		*pci_config_address_reg = cfgaddr(bus, devfn, where);
-		*(volatile u16 *)(((int)pci_config_data_reg) + (where & 2)) = val;
-		break;
-	case 4:
-		if (where & 3)
-			return PCIBIOS_BAD_REGISTER_NUMBER;
-		*pci_config_address_reg = cfgaddr(bus, devfn, where);
-		*pci_config_data_reg = (val);
-	}
-
-	return PCIBIOS_SUCCESSFUL;
-}
-
-
-struct pci_ops adm8668_pci_ops = {
-	.read = adm8668_read_config,
-	.write = adm8668_write_config
-};
-
-
-struct resource pciioport_resource = {
-	.name	= "adm8668_pci",
-	.start	= ADMPCI_IO_BASE,
-	.end	= ADMPCI_IO_BASE + ADMPCI_IO_SIZE,
-	.flags	= IORESOURCE_IO
-};
-
-
-struct resource pciiomem_resource = {
-	.name	= "adm8668_pci",
-	.start	= ADMPCI_MEM_BASE,
-	.end	= ADMPCI_MEM_BASE + ADMPCI_MEM_SIZE,
-	.flags	= IORESOURCE_MEM
-};
-
-#ifdef CONFIG_ADM8668_DISABLE_PCI
-struct pci_controller mips_pci_channels[] = {
-	{ NULL, NULL, NULL , NULL , NULL}
-};
-#else
-struct pci_controller mips_pci_channels = {
-	.pci_ops = &adm8668_pci_ops,
-	.io_resource = &pciioport_resource,
-	.mem_resource = &pciiomem_resource,
-};
-#endif
-
-int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
-{
-	switch (slot)
-	{
-		case 1:
-			return 14;
-		case 2:
-			return 13;
-		case 3:
-			return 12;
-		default:
-			return dev->irq;
-	}
-}
-
-int pcibios_plat_dev_init(struct pci_dev *dev)
-{
-	return 0;
-}
-
-static int __init adm8668_pci_init(void)
-{
-	void __iomem *io_map_base;
-
-	printk("adm8668_pci_init()\n");
-
-	/* what's an io port? this is MIPS... *shrug* */
-	ioport_resource.start   = ADMPCI_IO_BASE;
-	ioport_resource.end     = ADMPCI_IO_BASE + ADMPCI_IO_SIZE;
-
-	io_map_base = ioremap(ADMPCI_IO_BASE, ADMPCI_IO_SIZE);
-	if (!io_map_base)
-		printk("io_map_base didn't work.\n");
-	mips_pci_channels.io_map_base = (unsigned long)io_map_base;
-	register_pci_controller(&mips_pci_channels);
-
-	/* this needed? linksys' gpl 2.4 did it... */
-	adm8668_write_config(NULL, 0, PCI_CACHE_LINE_SIZE, 2, 0);
-	adm8668_write_config(NULL, 0, PCI_BASE_ADDRESS_0, 4, 0);
-	adm8668_write_config(NULL, 0, PCI_BASE_ADDRESS_1, 4, 0);
-	adm8668_write_config(NULL, 0, PCI_COMMAND, 4, PCI_CMM_DEF);
-
-	return 0;
-}
-
-arch_initcall(adm8668_pci_init);
diff --git a/target/linux/adm8668/files/arch/mips/include/asm/mach-adm8668/adm8668.h b/target/linux/adm8668/files/arch/mips/include/asm/mach-adm8668/adm8668.h
index 250447b..f0608d1 100644
--- a/target/linux/adm8668/files/arch/mips/include/asm/mach-adm8668/adm8668.h
+++ b/target/linux/adm8668/files/arch/mips/include/asm/mach-adm8668/adm8668.h
@@ -26,8 +26,8 @@
 #define ADM8668_SMEM0_BASE	0x1FC00000
 #define ADM8668_NAND_BASE	0x1FFFFF00
 
-#define PCICFG_BASE		0x12200000
-#define PCIDAT_BASE		0x12400000
+#define ADM8668_PCICFG_BASE	0x12200000
+#define ADM8668_PCIDAT_BASE	0x12400000
 
 /** onboard uart **/
 #define ADM8668_UARTCLK_FREQ	62500000
diff --git a/target/linux/adm8668/files/arch/mips/pci/pci-adm8668.c b/target/linux/adm8668/files/arch/mips/pci/pci-adm8668.c
new file mode 100644
index 0000000..5cfa546
--- /dev/null
+++ b/target/linux/adm8668/files/arch/mips/pci/pci-adm8668.c
@@ -0,0 +1,200 @@
+/*
+ * Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
+ * Copyright (C) 2012 Florian Fainelli <florian@openwrt.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Note that this controller is identical to the ADM5120 one
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/types.h>
+#include <linux/spinlock.h>
+
+#include <asm/byteorder.h>
+#include <asm/pci.h>
+#include <adm8668.h>
+
+static DEFINE_SPINLOCK(pci_lock);
+
+#define PCI_ENABLE			0x80000000
+#define	ADMPCI_IO_BASE			0x12600000
+#define	ADMPCI_IO_SIZE			0x1fffff
+#define	ADMPCI_MEM_BASE			0x16000000
+#define	ADMPCI_MEM_SIZE			0x7ffffff
+
+static inline void write_cfgaddr(u32 addr)
+{
+	__raw_writel((addr | PCI_ENABLE),
+			(void __iomem *)KSEG1ADDR(ADM8668_PCICFG_BASE));
+}
+
+static inline void write_cfgdata(u32 data)
+{
+	__raw_writel(data, (void __iomem *)KSEG1ADDR(ADM8668_PCIDAT_BASE));
+}
+
+static inline u32 read_cfgdata(void)
+{
+	return __raw_readl((void __iomem *)KSEG1ADDR(ADM8668_PCIDAT_BASE));
+}
+
+static inline u32 mkaddr(struct pci_bus *bus, unsigned int devfn, int where)
+{
+	return ((bus->number & 0xff) << 16) | ((devfn & 0xff) << 8) |
+		(where & 0xfc);
+}
+
+static int pci_read_config(struct pci_bus *bus, unsigned int devfn,
+				int where, int size, u32 *val)
+{
+	unsigned long flags;
+	u32 data;
+
+	spin_lock_irqsave(&pci_lock, flags);
+	write_cfgaddr(mkaddr(bus, devfn, where));
+	data = read_cfgdata();
+
+	switch (size) {
+	case 1:
+		if (where & 1)
+			data >>= 8;
+		if (where & 2)
+			data >>= 16;
+		data &= 0xff;
+		break;
+	case 2:
+		if (where & 2)
+			data >>= 16;
+		data &= 0xffff;
+		break;
+	}
+
+	*val = data;
+
+	spin_unlock_irqrestore(&pci_lock, flags);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int pci_write_config(struct pci_bus *bus, unsigned int devfn,
+				int where, int size, u32 val)
+{
+	unsigned long flags;
+	u32 data;
+	int s;
+
+	spin_lock_irqsave(&pci_lock, flags);
+
+	write_cfgaddr(mkaddr(bus, devfn, where));
+	data = read_cfgdata();
+
+	switch (size) {
+	case 1:
+		s = ((where & 3) << 3);
+		data &= ~(0xff << s);
+		data |= ((val & 0xff) << s);
+		break;
+	case 2:
+		s = ((where & 2) << 4);
+		data &= ~(0xffff << s);
+		data |= ((val & 0xffff) << s);
+		break;
+	case 4:
+		data = val;
+		break;
+	}
+
+	write_cfgdata(data);
+
+	spin_unlock_irqrestore(&pci_lock, flags);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops adm8668_pci_ops = {
+	.read = pci_read_config,
+	.write = pci_write_config
+};
+
+
+struct resource pciioport_resource = {
+	.name	= "adm8668_pci",
+	.start	= ADMPCI_IO_BASE,
+	.end	= ADMPCI_IO_BASE + ADMPCI_IO_SIZE,
+	.flags	= IORESOURCE_IO
+};
+
+struct resource pciiomem_resource = {
+	.name	= "adm8668_pci",
+	.start	= ADMPCI_MEM_BASE,
+	.end	= ADMPCI_MEM_BASE + ADMPCI_MEM_SIZE,
+	.flags	= IORESOURCE_MEM
+};
+
+struct pci_controller adm8668_pci_controller = {
+	.pci_ops	= &adm8668_pci_ops,
+	.io_resource	= &pciioport_resource,
+	.mem_resource	= &pciiomem_resource,
+};
+
+int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	switch (slot) {
+	case 1:
+		return 14;
+	case 2:
+		return 13;
+	case 3:
+		return 12;
+	default:
+		return dev->irq;
+	}
+}
+
+int pcibios_plat_dev_init(struct pci_dev *dev)
+{
+	return 0;
+}
+
+static void adm8668_pci_fixup(struct pci_dev *dev)
+{
+	if (dev->devfn != 0)
+		return;
+
+	pr_info("PCI: fixing up ADM8668 controller\n");
+
+	/* setup COMMAND register */
+	pci_write_config_word(dev, PCI_COMMAND,
+		(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER));
+
+	/* setup CACHE_LINE_SIZE register */
+	pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 4);
+
+	/* setup BARS */
+	pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, 0);
+	pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, 0);
+}
+DECLARE_PCI_FIXUP_HEADER(0x1317, 0x8688, adm8668_pci_fixup);
+
+static int __init adm8668_pci_init(void)
+{
+	void __iomem *io_map_base;
+
+	ioport_resource.start   = ADMPCI_IO_BASE;
+	ioport_resource.end     = ADMPCI_IO_BASE + ADMPCI_IO_SIZE;
+
+	io_map_base = ioremap(ADMPCI_IO_BASE, ADMPCI_IO_SIZE);
+	if (!io_map_base)
+		printk("io_map_base didn't work.\n");
+
+	adm8668_pci_controller.io_map_base = (unsigned long)io_map_base;
+	register_pci_controller(&adm8668_pci_controller);
+
+	return 0;
+}
+arch_initcall(adm8668_pci_init);