path: root/target/linux/atheros/patches-3.14/105-ar2315_pci.patch

--- a/arch/mips/ar231x/Makefile
+++ b/arch/mips/ar231x/Makefile
@@ -14,3 +14,4 @@ obj-$(CONFIG_EARLY_PRINTK) += early_prin
 
 obj-$(CONFIG_ATHEROS_AR5312) += ar5312.o
 obj-$(CONFIG_ATHEROS_AR2315) += ar2315.o
+obj-$(CONFIG_ATHEROS_AR2315_PCI) += pci.o
--- /dev/null
+++ b/arch/mips/ar231x/pci.c
@@ -0,0 +1,280 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * Both AR2315 and AR2316 chips have PCI interface unit, which supports DMA
+ * and interrupt. PCI interface supports MMIO access method, but does not
+ * seem to support I/O ports.
+ *
+ * Read/write operation in the region 0x80000000-0xBFFFFFFF causes
+ * a memory read/write command on the PCI bus. 30 LSBs of address on
+ * the bus are taken from memory read/write request and 2 MSBs are
+ * determined by PCI unit configuration.
+ *
+ * To work with the configuration space instead of memory is necessary set
+ * the CFG_SEL bit in the PCI_MISC_CONFIG register.
+ *
+ * Devices on the bus can perform DMA requests via chip BAR1. PCI host
+ * controller BARs are programmend as if an external device is programmed.
+ * Which means that during configuration, IDSEL pin of the chip should be
+ * asserted.
+ *
+ * We know (and support) only one board that uses the PCI interface -
+ * Fonera 2.0g (FON2202). It has a USB EHCI controller connected to the
+ * AR2315 PCI bus. IDSEL pin of USB controller is connected to AD[13] line
+ * and IDSEL pin of AR125 is connected to AD[16] line.
+ */
+
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <asm/paccess.h>
+#include <ar231x_platform.h>
+#include <ar231x.h>
+#include <ar2315_regs.h>
+#include "devices.h"
+
+#define AR2315_MEM_BASE    0x80800000UL
+#define AR2315_MEM_SIZE    0x00ffffffUL
+#define AR2315_IO_SIZE     0x00007fffUL
+
+#define AR2315_PCI_HOST_SLOT	3
+#define AR2315_PCI_HOST_DEVID	((0xff18 << 16) | PCI_VENDOR_ID_ATHEROS)
+
+static unsigned long configspace;
+
+static int ar2315_pci_cfg_access(int devfn, int where, int size, u32 *ptr,
+				 bool write)
+{
+	int func = PCI_FUNC(devfn);
+	int dev = PCI_SLOT(devfn);
+	u32 value = 0;
+	int err = 0;
+	u32 addr;
+
+	/* Select Configuration access */
+	ar231x_mask_reg(AR2315_PCI_MISC_CONFIG, 0, AR2315_PCIMISC_CFG_SEL);
+	mb();
+
+	addr = (u32)configspace + (1 << (13 + dev)) + (func << 8) + where;
+	if (size == 1)
+		addr ^= 0x3;
+	else if (size == 2)
+		addr ^= 0x2;
+
+	if (write) {
+		value = *ptr;
+		if (size == 1)
+			err = put_dbe(value, (u8 *)addr);
+		else if (size == 2)
+			err = put_dbe(value, (u16 *)addr);
+		else if (size == 4)
+			err = put_dbe(value, (u32 *)addr);
+	} else {
+		if (size == 1)
+			err = get_dbe(value, (u8 *)addr);
+		else if (size == 2)
+			err = get_dbe(value, (u16 *)addr);
+		else if (size == 4)
+			err = get_dbe(value, (u32 *)addr);
+		if (err)
+			*ptr = 0xffffffff;
+		else
+			*ptr = value;
+	}
+
+	/* Select Memory access */
+	ar231x_mask_reg(AR2315_PCI_MISC_CONFIG, AR2315_PCIMISC_CFG_SEL, 0);
+
+	return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
+}
+
+static inline int ar2315_pci_local_cfg_rd(unsigned devfn, int where, u32 *val)
+{
+	return ar2315_pci_cfg_access(devfn, where, sizeof(u32), val, false);
+}
+
+static inline int ar2315_pci_local_cfg_wr(unsigned devfn, int where, u32 val)
+{
+	return ar2315_pci_cfg_access(devfn, where, sizeof(u32), &val, true);
+}
+
+static int ar2315_pci_cfg_read(struct pci_bus *bus, unsigned int devfn,
+			       int where, int size, u32 *value)
+{
+	if ((PCI_SLOT(devfn) != 0) || (PCI_FUNC(devfn) > 2))
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	return ar2315_pci_cfg_access(devfn, where, size, value, 0);
+}
+
+static int ar2315_pci_cfg_write(struct pci_bus *bus, unsigned int devfn,
+				int where, int size, u32 value)
+{
+	if ((PCI_SLOT(devfn) != 0) || (PCI_FUNC(devfn) > 2))
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	return ar2315_pci_cfg_access(devfn, where, size, &value, 1);
+}
+
+static struct pci_ops ar2315_pci_ops = {
+	.read	= ar2315_pci_cfg_read,
+	.write	= ar2315_pci_cfg_write,
+};
+
+static struct resource ar2315_mem_resource = {
+	.name	= "ar2315-pci-mem",
+	.start	= AR2315_MEM_BASE,
+	.end	= AR2315_MEM_BASE + AR2315_MEM_SIZE - AR2315_IO_SIZE - 1 +
+		  0x4000000,
+	.flags	= IORESOURCE_MEM,
+};
+
+static struct resource ar2315_io_resource = {
+	.name	= "ar2315-pci-io",
+	.start	= AR2315_MEM_BASE + AR2315_MEM_SIZE - AR2315_IO_SIZE,
+	.end	= AR2315_MEM_BASE + AR2315_MEM_SIZE - 1,
+	.flags	= IORESOURCE_IO,
+};
+
+static struct pci_controller ar2315_pci_controller = {
+	.pci_ops	= &ar2315_pci_ops,
+	.mem_resource	= &ar2315_mem_resource,
+	.io_resource	= &ar2315_io_resource,
+	.mem_offset     = 0x00000000UL,
+	.io_offset      = 0x00000000UL,
+};
+
+int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	return AR2315_IRQ_LCBUS_PCI;
+}
+
+int pcibios_plat_dev_init(struct pci_dev *dev)
+{
+	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 5);
+	pci_write_config_word(dev, 0x40, 0);
+
+	/* Clear any pending Abort or external Interrupts
+	 * and enable interrupt processing */
+	ar231x_mask_reg(AR2315_PCI_INTEN_REG, AR2315_PCI_INT_ENABLE, 0);
+	ar231x_write_reg(AR2315_PCI_INT_STATUS, (AR2315_PCI_ABORT_INT |
+			 AR2315_PCI_EXT_INT));
+	ar231x_write_reg(AR2315_PCI_INT_MASK, (AR2315_PCI_ABORT_INT |
+			 AR2315_PCI_EXT_INT));
+	ar231x_mask_reg(AR2315_PCI_INTEN_REG, 0, AR2315_PCI_INT_ENABLE);
+
+	return 0;
+}
+
+static int ar2315_pci_host_setup(void)
+{
+	unsigned devfn = PCI_DEVFN(AR2315_PCI_HOST_SLOT, 0);
+	int res;
+	u32 id;
+
+	res = ar2315_pci_local_cfg_rd(devfn, PCI_VENDOR_ID, &id);
+	if (res != PCIBIOS_SUCCESSFUL || id != AR2315_PCI_HOST_DEVID)
+		return -ENODEV;
+
+	/* Program MBARs */
+	ar2315_pci_local_cfg_wr(devfn, PCI_BASE_ADDRESS_0, HOST_PCI_MBAR0);
+	ar2315_pci_local_cfg_wr(devfn, PCI_BASE_ADDRESS_1, HOST_PCI_MBAR1);
+	ar2315_pci_local_cfg_wr(devfn, PCI_BASE_ADDRESS_2, HOST_PCI_MBAR2);
+
+	/* Run */
+	ar2315_pci_local_cfg_wr(devfn, PCI_COMMAND, PCI_COMMAND_MEMORY |
+				PCI_COMMAND_MASTER | PCI_COMMAND_SPECIAL |
+				PCI_COMMAND_INVALIDATE | PCI_COMMAND_PARITY |
+				PCI_COMMAND_SERR | PCI_COMMAND_FAST_BACK);
+
+	return 0;
+}
+
+static int __init
+ar2315_pci_init(void)
+{
+	u32 reg;
+	int res;
+
+	if (ar231x_devtype != DEV_TYPE_AR2315)
+		return -ENODEV;
+
+	/* Remap PCI config space */
+	configspace = (unsigned long)ioremap_nocache(AR2315_PCIEXT,
+						     1 * 1024 * 1024);
+	ar2315_pci_controller.io_map_base =
+			(unsigned long)ioremap_nocache(AR2315_MEM_BASE +
+			AR2315_MEM_SIZE, AR2315_IO_SIZE);
+	set_io_port_base(ar2315_pci_controller.io_map_base); /* PCI I/O space*/
+
+	reg = ar231x_mask_reg(AR2315_RESET, 0, AR2315_RESET_PCIDMA);
+	msleep(20);
+
+	reg &= ~AR2315_RESET_PCIDMA;
+	ar231x_write_reg(AR2315_RESET, reg);
+	msleep(20);
+
+	ar231x_mask_reg(AR2315_ENDIAN_CTL, 0,
+			AR2315_CONFIG_PCIAHB | AR2315_CONFIG_PCIAHB_BRIDGE);
+
+	ar231x_write_reg(AR2315_PCICLK, AR2315_PCICLK_PLLC_CLKM |
+			 (AR2315_PCICLK_IN_FREQ_DIV_6 << AR2315_PCICLK_DIV_S));
+	ar231x_mask_reg(AR2315_AHB_ARB_CTL, 0, AR2315_ARB_PCI);
+	ar231x_mask_reg(AR2315_IF_CTL, AR2315_IF_PCI_CLK_MASK | AR2315_IF_MASK,
+			AR2315_IF_PCI | AR2315_IF_PCI_HOST |
+			AR2315_IF_PCI_INTR | (AR2315_IF_PCI_CLK_OUTPUT_CLK <<
+					      AR2315_IF_PCI_CLK_SHIFT));
+
+	/* Reset the PCI bus by setting bits 5-4 in PCI_MCFG */
+	ar231x_mask_reg(AR2315_PCI_MISC_CONFIG, AR2315_PCIMISC_RST_MODE,
+			AR2315_PCIRST_LOW);
+	msleep(100);
+
+	/* Bring the PCI out of reset */
+	ar231x_mask_reg(AR2315_PCI_MISC_CONFIG, AR2315_PCIMISC_RST_MODE,
+			AR2315_PCIRST_HIGH | AR2315_PCICACHE_DIS | 0x8);
+
+	ar231x_write_reg(AR2315_PCI_UNCACHE_CFG,
+			 0x1E | /* 1GB uncached */
+			 (1 << 5) | /* Enable uncached */
+			 (0x2 << 30) /* Base: 0x80000000 */);
+	ar231x_read_reg(AR2315_PCI_UNCACHE_CFG);
+
+	msleep(500);
+
+	/* dirty hack - anyone with a datasheet that knows the memory map ? */
+	ioport_resource.start = 0x10000000;
+	ioport_resource.end = 0xffffffff;
+
+	res = ar2315_pci_host_setup();
+	if (res)
+		goto error;
+
+	register_pci_controller(&ar2315_pci_controller);
+
+	return 0;
+
+error:
+	iounmap((void __iomem *)configspace);
+	return res;
+}
+
+arch_initcall(ar2315_pci_init);
--- a/arch/mips/ar231x/Kconfig
+++ b/arch/mips/ar231x/Kconfig
@@ -7,3 +7,10 @@ config ATHEROS_AR2315
 	bool "Atheros 2315+ support"
 	depends on ATHEROS_AR231X
 	default y
+
+config ATHEROS_AR2315_PCI
+	bool "PCI support"
+	depends on ATHEROS_AR2315
+	select HW_HAS_PCI
+	select PCI
+	default y
--- a/arch/mips/ar231x/ar2315.c
+++ b/arch/mips/ar231x/ar2315.c
@@ -87,6 +87,28 @@ static void ar2315_misc_irq_handler(unsi
 		do_IRQ(AR2315_MISC_IRQ_NONE);
 }
 
+#ifdef CONFIG_ATHEROS_AR2315_PCI
+static inline void pci_abort_irq(void)
+{
+	ar231x_write_reg(AR2315_PCI_INT_STATUS, AR2315_PCI_ABORT_INT);
+}
+
+static inline void pci_ack_irq(void)
+{
+	ar231x_write_reg(AR2315_PCI_INT_STATUS, AR2315_PCI_EXT_INT);
+}
+
+static void ar2315_pci_irq(int irq)
+{
+	if (ar231x_read_reg(AR2315_PCI_INT_STATUS) == AR2315_PCI_ABORT_INT)
+		pci_abort_irq();
+	else {
+		do_IRQ(irq);
+		pci_ack_irq();
+	}
+}
+#endif /* CONFIG_ATHEROS_AR2315_PCI */
+
 /*
  * Called when an interrupt is received, this function
  * determines exactly which interrupt it was, and it
@@ -104,6 +126,10 @@ ar2315_irq_dispatch(void)
 		do_IRQ(AR2315_IRQ_WLAN0_INTRS);
 	else if (pending & CAUSEF_IP4)
 		do_IRQ(AR2315_IRQ_ENET0_INTRS);
+#ifdef CONFIG_ATHEROS_AR2315_PCI
+	else if (pending & CAUSEF_IP5)
+		ar2315_pci_irq(AR2315_IRQ_LCBUS_PCI);
+#endif
 	else if (pending & CAUSEF_IP2)
 		do_IRQ(AR2315_IRQ_MISC_INTRS);
 	else if (pending & CAUSEF_IP7)