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[PATCH 1/2] Initial PCI support for Atheros 724x SoCs. (v2)

To: Ralf Baechle <ralf@linux-mips.org>
Subject: [PATCH 1/2] Initial PCI support for Atheros 724x SoCs. (v2)
From: Rene Bolldorf <xsecute@googlemail.com>
Date: Thu, 17 Nov 2011 15:02:56 +0100
Cc: linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, Rene Bolldorf <xsecute@googlemail.com>
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Signed-off-by: Rene Bolldorf <xsecute@googlemail.com>
---
 arch/mips/include/asm/mach-ath79/pci-ath724x.h |   21 +++
 arch/mips/pci/Makefile                         |    1 +
 arch/mips/pci/pci-ath724x.c                    |  174 ++++++++++++++++++++++++
 3 files changed, 196 insertions(+), 0 deletions(-)
 create mode 100644 arch/mips/include/asm/mach-ath79/pci-ath724x.h
 create mode 100644 arch/mips/pci/pci-ath724x.c

diff --git a/arch/mips/include/asm/mach-ath79/pci-ath724x.h 
b/arch/mips/include/asm/mach-ath79/pci-ath724x.h
new file mode 100644
index 0000000..454885f
--- /dev/null
+++ b/arch/mips/include/asm/mach-ath79/pci-ath724x.h
@@ -0,0 +1,21 @@
+/*
+ *  Atheros 724x PCI support
+ *
+ *  Copyright (C) 2011 René Bolldorf <xsecute@googlemail.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ */
+
+#ifndef __ASM_MACH_ATH79_PCI_ATH724X_H
+#define __ASM_MACH_ATH79_PCI_ATH724X_H
+
+struct ath724x_pci_data {
+       int irq;
+       void *pdata;
+};
+
+void ath724x_pci_add_data(struct ath724x_pci_data *data, int size);
+
+#endif /* __ASM_MACH_ATH79_PCI_ATH724X_H */
diff --git a/arch/mips/pci/Makefile b/arch/mips/pci/Makefile
index bb82cbd..19cfe04 100644
--- a/arch/mips/pci/Makefile
+++ b/arch/mips/pci/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_BCM47XX)         += pci-bcm47xx.o
 obj-$(CONFIG_BCM63XX)          += pci-bcm63xx.o fixup-bcm63xx.o \
                                        ops-bcm63xx.o
 obj-$(CONFIG_MIPS_ALCHEMY)     += pci-alchemy.o
+obj-$(CONFIG_SOC_AR724X)       += pci-ath724x.o
 
 #
 # These are still pretty much in the old state, watch, go blind.
diff --git a/arch/mips/pci/pci-ath724x.c b/arch/mips/pci/pci-ath724x.c
new file mode 100644
index 0000000..9f30e5d
--- /dev/null
+++ b/arch/mips/pci/pci-ath724x.c
@@ -0,0 +1,174 @@
+/*
+ *  Atheros 724x PCI support
+ *
+ *  Copyright (C) 2011 René Bolldorf <xsecute@googlemail.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ */
+
+#include <linux/pci.h>
+#include <asm/mach-ath79/pci-ath724x.h>
+
+#define reg_read(_phys)                (*(unsigned int *) KSEG1ADDR(_phys))
+#define reg_write(_phys, _val) ((*(unsigned int *) KSEG1ADDR(_phys)) = (_val))
+
+#define ATH724X_PCI_DEV_BASE   0x14000000
+#define ATH724X_PCI_MEM_BASE   0x10000000
+#define ATH724X_PCI_MEM_SIZE   0x08000000
+
+static DEFINE_SPINLOCK(ath724x_pci_lock);
+static struct ath724x_pci_data *pci_data;
+static int pci_data_size;
+
+static int ath724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where,
+                           int size, uint32_t *value)
+{
+       unsigned long flags, addr, tval, mask;
+
+       if (devfn)
+               return PCIBIOS_DEVICE_NOT_FOUND;
+
+       if (where & (size - 1))
+               return PCIBIOS_BAD_REGISTER_NUMBER;
+
+       spin_lock_irqsave(&ath724x_pci_lock, flags);
+
+       switch (size) {
+       case 1:
+               addr = where & ~3;
+               mask = 0xff000000 >> ((where % 4) * 8);
+               tval = reg_read(ATH724X_PCI_DEV_BASE + addr);
+               tval = tval & ~mask;
+               *value = (tval >> ((4 - (where % 4))*8));
+       break;
+       case 2:
+               addr = where & ~3;
+               mask = 0xffff0000 >> ((where % 4)*8);
+               tval = reg_read(ATH724X_PCI_DEV_BASE + addr);
+               tval = tval & ~mask;
+               *value = (tval >> ((4 - (where % 4))*8));
+       break;
+       case 4:
+               *value = reg_read(ATH724X_PCI_DEV_BASE + where);
+       break;
+       default:
+               spin_unlock_irqrestore(&ath724x_pci_lock, flags);
+
+               return PCIBIOS_BAD_REGISTER_NUMBER;
+       }
+
+       spin_unlock_irqrestore(&ath724x_pci_lock, flags);
+
+       return PCIBIOS_SUCCESSFUL;
+}
+
+static int ath724x_pci_write(struct pci_bus *bus, unsigned int devfn, int 
where,
+                            int size, uint32_t value)
+{
+       unsigned long flags, tval, addr, mask;
+
+       if (devfn)
+               return PCIBIOS_DEVICE_NOT_FOUND;
+
+       if (where & (size - 1))
+               return PCIBIOS_BAD_REGISTER_NUMBER;
+
+       spin_lock_irqsave(&ath724x_pci_lock, flags);
+
+       switch (size) {
+       case 1:
+               addr = (ATH724X_PCI_DEV_BASE + where) & ~3;
+               mask = 0xff000000 >> ((where % 4)*8);
+               tval = reg_read(addr);
+               tval = tval & ~mask;
+               tval |= (value << ((4 - (where % 4))*8)) & mask;
+               reg_write(addr, tval);
+       break;
+       case 2:
+               addr = (ATH724X_PCI_DEV_BASE + where) & ~3;
+               mask = 0xffff0000 >> ((where % 4)*8);
+               tval = reg_read(addr);
+               tval = tval & ~mask;
+               tval |= (value << ((4 - (where % 4))*8)) & mask;
+               reg_write(addr, tval);
+       break;
+       case 4:
+               reg_write((ATH724X_PCI_DEV_BASE + where), value);
+       break;
+       default:
+               spin_unlock_irqrestore(&ath724x_pci_lock, flags);
+
+               return PCIBIOS_BAD_REGISTER_NUMBER;
+       }
+
+       spin_unlock_irqrestore(&ath724x_pci_lock, flags);
+
+       return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops ath724x_pci_ops = {
+       .read   = ath724x_pci_read,
+       .write  = ath724x_pci_write,
+};
+
+static struct resource ath724x_io_resource = {
+       .name   = "PCI IO space",
+       .start  = 0,
+       .end    = 0,
+       .flags  = IORESOURCE_IO,
+};
+
+static struct resource ath724x_mem_resource = {
+       .name   = "PCI memory space",
+       .start  = ATH724X_PCI_MEM_BASE,
+       .end    = ATH724X_PCI_MEM_BASE + ATH724X_PCI_MEM_SIZE - 1,
+       .flags  = IORESOURCE_MEM,
+};
+
+static struct pci_controller ath724x_pci_controller = {
+       .pci_ops        = &ath724x_pci_ops,
+       .io_resource    = &ath724x_io_resource,
+       .mem_resource   = &ath724x_mem_resource,
+};
+
+void ath724x_pci_add_data(struct ath724x_pci_data *data, int size)
+{
+       pci_data        = data;
+       pci_data_size   = size;
+}
+
+int __init pcibios_map_irq(const struct pci_dev *dev, uint8_t slot, uint8_t 
pin)
+{
+       unsigned int devfn = dev->devfn;
+       int irq = -1;
+
+       if (devfn > pci_data_size - 1)
+               return irq;
+
+       irq = pci_data[devfn].irq;
+
+       return irq;
+}
+
+int pcibios_plat_dev_init(struct pci_dev *dev)
+{
+       unsigned int devfn = dev->devfn;
+
+       if (devfn > pci_data_size - 1)
+               return PCIBIOS_DEVICE_NOT_FOUND;
+
+       dev->dev.platform_data = pci_data[devfn].pdata;
+
+       return PCIBIOS_SUCCESSFUL;
+}
+
+static int __init ath724x_pcibios_init(void)
+{
+       register_pci_controller(&ath724x_pci_controller);
+
+       return PCIBIOS_SUCCESSFUL;
+}
+
+arch_initcall(ath724x_pcibios_init);
-- 
1.7.7.1


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