614 lines
18 KiB
Diff
614 lines
18 KiB
Diff
|
--- 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_PCI_AR2315) += pci-ar2315.o
|
||
|
obj-$(CONFIG_SOC_AR71XX) += pci-ar71xx.o
|
||
|
obj-$(CONFIG_PCI_AR724X) += pci-ar724x.o
|
||
|
obj-$(CONFIG_MIPS_PCI_VIRTIO) += pci-virtio-guest.o
|
||
|
--- /dev/null
|
||
|
+++ b/arch/mips/pci/pci-ar2315.c
|
||
|
@@ -0,0 +1,511 @@
|
||
|
+/*
|
||
|
+ * 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 AR2315 is connected to AD[16] line.
|
||
|
+ */
|
||
|
+
|
||
|
+#include <linux/types.h>
|
||
|
+#include <linux/pci.h>
|
||
|
+#include <linux/platform_device.h>
|
||
|
+#include <linux/kernel.h>
|
||
|
+#include <linux/init.h>
|
||
|
+#include <linux/mm.h>
|
||
|
+#include <linux/delay.h>
|
||
|
+#include <linux/bitops.h>
|
||
|
+#include <linux/irq.h>
|
||
|
+#include <linux/irqdomain.h>
|
||
|
+#include <linux/io.h>
|
||
|
+#include <asm/paccess.h>
|
||
|
+
|
||
|
+/*
|
||
|
+ * PCI Bus Interface Registers
|
||
|
+ */
|
||
|
+#define AR2315_PCI_1MS_REG 0x0008
|
||
|
+
|
||
|
+#define AR2315_PCI_1MS_MASK 0x3FFFF /* # of AHB clk cycles in 1ms */
|
||
|
+
|
||
|
+#define AR2315_PCI_MISC_CONFIG 0x000c
|
||
|
+
|
||
|
+#define AR2315_PCIMISC_TXD_EN 0x00000001 /* Enable TXD for fragments */
|
||
|
+#define AR2315_PCIMISC_CFG_SEL 0x00000002 /* Mem or Config cycles */
|
||
|
+#define AR2315_PCIMISC_GIG_MASK 0x0000000C /* bits 31-30 for pci req */
|
||
|
+#define AR2315_PCIMISC_RST_MODE 0x00000030
|
||
|
+#define AR2315_PCIRST_INPUT 0x00000000 /* 4:5=0 rst is input */
|
||
|
+#define AR2315_PCIRST_LOW 0x00000010 /* 4:5=1 rst to GND */
|
||
|
+#define AR2315_PCIRST_HIGH 0x00000020 /* 4:5=2 rst to VDD */
|
||
|
+#define AR2315_PCIGRANT_EN 0x00000000 /* 6:7=0 early grant en */
|
||
|
+#define AR2315_PCIGRANT_FRAME 0x00000040 /* 6:7=1 grant waits 4 frame */
|
||
|
+#define AR2315_PCIGRANT_IDLE 0x00000080 /* 6:7=2 grant waits 4 idle */
|
||
|
+#define AR2315_PCIGRANT_GAP 0x00000000 /* 6:7=2 grant waits 4 idle */
|
||
|
+#define AR2315_PCICACHE_DIS 0x00001000 /* PCI external access cache
|
||
|
+ * disable */
|
||
|
+
|
||
|
+#define AR2315_PCI_OUT_TSTAMP 0x0010
|
||
|
+
|
||
|
+#define AR2315_PCI_UNCACHE_CFG 0x0014
|
||
|
+
|
||
|
+#define AR2315_PCI_IN_EN 0x0100
|
||
|
+
|
||
|
+#define AR2315_PCI_IN_EN0 0x01 /* Enable chain 0 */
|
||
|
+#define AR2315_PCI_IN_EN1 0x02 /* Enable chain 1 */
|
||
|
+#define AR2315_PCI_IN_EN2 0x04 /* Enable chain 2 */
|
||
|
+#define AR2315_PCI_IN_EN3 0x08 /* Enable chain 3 */
|
||
|
+
|
||
|
+#define AR2315_PCI_IN_DIS 0x0104
|
||
|
+
|
||
|
+#define AR2315_PCI_IN_DIS0 0x01 /* Disable chain 0 */
|
||
|
+#define AR2315_PCI_IN_DIS1 0x02 /* Disable chain 1 */
|
||
|
+#define AR2315_PCI_IN_DIS2 0x04 /* Disable chain 2 */
|
||
|
+#define AR2315_PCI_IN_DIS3 0x08 /* Disable chain 3 */
|
||
|
+
|
||
|
+#define AR2315_PCI_IN_PTR 0x0200
|
||
|
+
|
||
|
+#define AR2315_PCI_OUT_EN 0x0400
|
||
|
+
|
||
|
+#define AR2315_PCI_OUT_EN0 0x01 /* Enable chain 0 */
|
||
|
+
|
||
|
+#define AR2315_PCI_OUT_DIS 0x0404
|
||
|
+
|
||
|
+#define AR2315_PCI_OUT_DIS0 0x01 /* Disable chain 0 */
|
||
|
+
|
||
|
+#define AR2315_PCI_OUT_PTR 0x0408
|
||
|
+
|
||
|
+/* PCI interrupt status (write one to clear) */
|
||
|
+#define AR2315_PCI_ISR 0x0500
|
||
|
+
|
||
|
+#define AR2315_PCI_INT_TX 0x00000001 /* Desc In Completed */
|
||
|
+#define AR2315_PCI_INT_TXOK 0x00000002 /* Desc In OK */
|
||
|
+#define AR2315_PCI_INT_TXERR 0x00000004 /* Desc In ERR */
|
||
|
+#define AR2315_PCI_INT_TXEOL 0x00000008 /* Desc In End-of-List */
|
||
|
+#define AR2315_PCI_INT_RX 0x00000010 /* Desc Out Completed */
|
||
|
+#define AR2315_PCI_INT_RXOK 0x00000020 /* Desc Out OK */
|
||
|
+#define AR2315_PCI_INT_RXERR 0x00000040 /* Desc Out ERR */
|
||
|
+#define AR2315_PCI_INT_RXEOL 0x00000080 /* Desc Out EOL */
|
||
|
+#define AR2315_PCI_INT_TXOOD 0x00000200 /* Desc In Out-of-Desc */
|
||
|
+#define AR2315_PCI_INT_DESCMASK 0x0000FFFF /* Desc Mask */
|
||
|
+#define AR2315_PCI_INT_EXT 0x02000000 /* Extern PCI INTA */
|
||
|
+#define AR2315_PCI_INT_ABORT 0x04000000 /* PCI bus abort event */
|
||
|
+
|
||
|
+/* PCI interrupt mask */
|
||
|
+#define AR2315_PCI_IMR 0x0504
|
||
|
+
|
||
|
+/* Global PCI interrupt enable */
|
||
|
+#define AR2315_PCI_IER 0x0508
|
||
|
+
|
||
|
+#define AR2315_PCI_IER_DISABLE 0x00 /* disable pci interrupts */
|
||
|
+#define AR2315_PCI_IER_ENABLE 0x01 /* enable pci interrupts */
|
||
|
+
|
||
|
+#define AR2315_PCI_HOST_IN_EN 0x0800
|
||
|
+#define AR2315_PCI_HOST_IN_DIS 0x0804
|
||
|
+#define AR2315_PCI_HOST_IN_PTR 0x0810
|
||
|
+#define AR2315_PCI_HOST_OUT_EN 0x0900
|
||
|
+#define AR2315_PCI_HOST_OUT_DIS 0x0904
|
||
|
+#define AR2315_PCI_HOST_OUT_PTR 0x0908
|
||
|
+
|
||
|
+/*
|
||
|
+ * PCI interrupts, which share IP5
|
||
|
+ * Keep ordered according to AR2315_PCI_INT_XXX bits
|
||
|
+ */
|
||
|
+#define AR2315_PCI_IRQ_EXT 25
|
||
|
+#define AR2315_PCI_IRQ_ABORT 26
|
||
|
+#define AR2315_PCI_IRQ_COUNT 27
|
||
|
+
|
||
|
+/* Arbitrary size of memory region to access the configuration space */
|
||
|
+#define AR2315_PCI_CFG_SIZE 0x00100000
|
||
|
+
|
||
|
+#define AR2315_PCI_HOST_SLOT 3
|
||
|
+#define AR2315_PCI_HOST_DEVID ((0xff18 << 16) | PCI_VENDOR_ID_ATHEROS)
|
||
|
+
|
||
|
+/* ??? access BAR */
|
||
|
+#define AR2315_PCI_HOST_MBAR0 0x10000000
|
||
|
+/* RAM access BAR */
|
||
|
+#define AR2315_PCI_HOST_MBAR1 AR2315_PCI_HOST_SDRAM_BASEADDR
|
||
|
+/* ??? access BAR */
|
||
|
+#define AR2315_PCI_HOST_MBAR2 0x30000000
|
||
|
+
|
||
|
+struct ar2315_pci_ctrl {
|
||
|
+ void __iomem *cfg_mem;
|
||
|
+ void __iomem *mmr_mem;
|
||
|
+ unsigned irq;
|
||
|
+ unsigned irq_ext;
|
||
|
+ struct irq_domain *domain;
|
||
|
+ struct pci_controller pci_ctrl;
|
||
|
+ struct resource mem_res;
|
||
|
+ struct resource io_res;
|
||
|
+};
|
||
|
+
|
||
|
+static inline struct ar2315_pci_ctrl *ar2315_pci_bus_to_apc(struct pci_bus *bus)
|
||
|
+{
|
||
|
+ struct pci_controller *hose = bus->sysdata;
|
||
|
+
|
||
|
+ return container_of(hose, struct ar2315_pci_ctrl, pci_ctrl);
|
||
|
+}
|
||
|
+
|
||
|
+static inline u32 ar2315_pci_reg_read(struct ar2315_pci_ctrl *apc, u32 reg)
|
||
|
+{
|
||
|
+ return __raw_readl(apc->mmr_mem + reg);
|
||
|
+}
|
||
|
+
|
||
|
+static inline void ar2315_pci_reg_write(struct ar2315_pci_ctrl *apc, u32 reg,
|
||
|
+ u32 val)
|
||
|
+{
|
||
|
+ __raw_writel(val, apc->mmr_mem + reg);
|
||
|
+}
|
||
|
+
|
||
|
+static inline void ar2315_pci_reg_mask(struct ar2315_pci_ctrl *apc, u32 reg,
|
||
|
+ u32 mask, u32 val)
|
||
|
+{
|
||
|
+ u32 ret = ar2315_pci_reg_read(apc, reg);
|
||
|
+
|
||
|
+ ret &= ~mask;
|
||
|
+ ret |= val;
|
||
|
+ ar2315_pci_reg_write(apc, reg, ret);
|
||
|
+}
|
||
|
+
|
||
|
+static int ar2315_pci_cfg_access(struct ar2315_pci_ctrl *apc, unsigned devfn,
|
||
|
+ int where, int size, u32 *ptr, bool write)
|
||
|
+{
|
||
|
+ int func = PCI_FUNC(devfn);
|
||
|
+ int dev = PCI_SLOT(devfn);
|
||
|
+ u32 addr = (1 << (13 + dev)) | (func << 8) | (where & ~3);
|
||
|
+ u32 mask = 0xffffffff >> 8 * (4 - size);
|
||
|
+ u32 sh = (where & 3) * 8;
|
||
|
+ u32 value, isr;
|
||
|
+
|
||
|
+ /* Prevent access past the remapped area */
|
||
|
+ if (addr >= AR2315_PCI_CFG_SIZE || dev > 18)
|
||
|
+ return PCIBIOS_DEVICE_NOT_FOUND;
|
||
|
+
|
||
|
+ /* Clear pending errors */
|
||
|
+ ar2315_pci_reg_write(apc, AR2315_PCI_ISR, AR2315_PCI_INT_ABORT);
|
||
|
+ /* Select Configuration access */
|
||
|
+ ar2315_pci_reg_mask(apc, AR2315_PCI_MISC_CONFIG, 0,
|
||
|
+ AR2315_PCIMISC_CFG_SEL);
|
||
|
+
|
||
|
+ mb(); /* PCI must see space change before we begin */
|
||
|
+
|
||
|
+ value = __raw_readl(apc->cfg_mem + addr);
|
||
|
+
|
||
|
+ isr = ar2315_pci_reg_read(apc, AR2315_PCI_ISR);
|
||
|
+
|
||
|
+ if (isr & AR2315_PCI_INT_ABORT)
|
||
|
+ goto exit_err;
|
||
|
+
|
||
|
+ if (write) {
|
||
|
+ value = (value & ~(mask << sh)) | *ptr << sh;
|
||
|
+ __raw_writel(value, apc->cfg_mem + addr);
|
||
|
+ isr = ar2315_pci_reg_read(apc, AR2315_PCI_ISR);
|
||
|
+ if (isr & AR2315_PCI_INT_ABORT)
|
||
|
+ goto exit_err;
|
||
|
+ } else {
|
||
|
+ *ptr = (value >> sh) & mask;
|
||
|
+ }
|
||
|
+
|
||
|
+ goto exit;
|
||
|
+
|
||
|
+exit_err:
|
||
|
+ ar2315_pci_reg_write(apc, AR2315_PCI_ISR, AR2315_PCI_INT_ABORT);
|
||
|
+ if (!write)
|
||
|
+ *ptr = 0xffffffff;
|
||
|
+
|
||
|
+exit:
|
||
|
+ /* Select Memory access */
|
||
|
+ ar2315_pci_reg_mask(apc, AR2315_PCI_MISC_CONFIG, AR2315_PCIMISC_CFG_SEL,
|
||
|
+ 0);
|
||
|
+
|
||
|
+ return isr & AR2315_PCI_INT_ABORT ? PCIBIOS_DEVICE_NOT_FOUND :
|
||
|
+ PCIBIOS_SUCCESSFUL;
|
||
|
+}
|
||
|
+
|
||
|
+static inline int ar2315_pci_local_cfg_rd(struct ar2315_pci_ctrl *apc,
|
||
|
+ unsigned devfn, int where, u32 *val)
|
||
|
+{
|
||
|
+ return ar2315_pci_cfg_access(apc, devfn, where, sizeof(u32), val,
|
||
|
+ false);
|
||
|
+}
|
||
|
+
|
||
|
+static inline int ar2315_pci_local_cfg_wr(struct ar2315_pci_ctrl *apc,
|
||
|
+ unsigned devfn, int where, u32 val)
|
||
|
+{
|
||
|
+ return ar2315_pci_cfg_access(apc, devfn, where, sizeof(u32), &val,
|
||
|
+ true);
|
||
|
+}
|
||
|
+
|
||
|
+static int ar2315_pci_cfg_read(struct pci_bus *bus, unsigned devfn, int where,
|
||
|
+ int size, u32 *value)
|
||
|
+{
|
||
|
+ struct ar2315_pci_ctrl *apc = ar2315_pci_bus_to_apc(bus);
|
||
|
+
|
||
|
+ if (PCI_SLOT(devfn) == AR2315_PCI_HOST_SLOT)
|
||
|
+ return PCIBIOS_DEVICE_NOT_FOUND;
|
||
|
+
|
||
|
+ return ar2315_pci_cfg_access(apc, devfn, where, size, value, false);
|
||
|
+}
|
||
|
+
|
||
|
+static int ar2315_pci_cfg_write(struct pci_bus *bus, unsigned devfn, int where,
|
||
|
+ int size, u32 value)
|
||
|
+{
|
||
|
+ struct ar2315_pci_ctrl *apc = ar2315_pci_bus_to_apc(bus);
|
||
|
+
|
||
|
+ if (PCI_SLOT(devfn) == AR2315_PCI_HOST_SLOT)
|
||
|
+ return PCIBIOS_DEVICE_NOT_FOUND;
|
||
|
+
|
||
|
+ return ar2315_pci_cfg_access(apc, devfn, where, size, &value, true);
|
||
|
+}
|
||
|
+
|
||
|
+static struct pci_ops ar2315_pci_ops = {
|
||
|
+ .read = ar2315_pci_cfg_read,
|
||
|
+ .write = ar2315_pci_cfg_write,
|
||
|
+};
|
||
|
+
|
||
|
+static int ar2315_pci_host_setup(struct ar2315_pci_ctrl *apc)
|
||
|
+{
|
||
|
+ unsigned devfn = PCI_DEVFN(AR2315_PCI_HOST_SLOT, 0);
|
||
|
+ int res;
|
||
|
+ u32 id;
|
||
|
+
|
||
|
+ res = ar2315_pci_local_cfg_rd(apc, devfn, PCI_VENDOR_ID, &id);
|
||
|
+ if (res != PCIBIOS_SUCCESSFUL || id != AR2315_PCI_HOST_DEVID)
|
||
|
+ return -ENODEV;
|
||
|
+
|
||
|
+ /* Program MBARs */
|
||
|
+ ar2315_pci_local_cfg_wr(apc, devfn, PCI_BASE_ADDRESS_0,
|
||
|
+ AR2315_PCI_HOST_MBAR0);
|
||
|
+ ar2315_pci_local_cfg_wr(apc, devfn, PCI_BASE_ADDRESS_1,
|
||
|
+ AR2315_PCI_HOST_MBAR1);
|
||
|
+ ar2315_pci_local_cfg_wr(apc, devfn, PCI_BASE_ADDRESS_2,
|
||
|
+ AR2315_PCI_HOST_MBAR2);
|
||
|
+
|
||
|
+ /* Run */
|
||
|
+ ar2315_pci_local_cfg_wr(apc, 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 void ar2315_pci_irq_handler(unsigned irq, struct irq_desc *desc)
|
||
|
+{
|
||
|
+ struct ar2315_pci_ctrl *apc = irq_get_handler_data(irq);
|
||
|
+ u32 pending = ar2315_pci_reg_read(apc, AR2315_PCI_ISR) &
|
||
|
+ ar2315_pci_reg_read(apc, AR2315_PCI_IMR);
|
||
|
+ unsigned pci_irq = 0;
|
||
|
+
|
||
|
+ if (pending)
|
||
|
+ pci_irq = irq_find_mapping(apc->domain, __ffs(pending));
|
||
|
+
|
||
|
+ if (pci_irq)
|
||
|
+ generic_handle_irq(pci_irq);
|
||
|
+ else
|
||
|
+ spurious_interrupt();
|
||
|
+}
|
||
|
+
|
||
|
+static void ar2315_pci_irq_mask(struct irq_data *d)
|
||
|
+{
|
||
|
+ struct ar2315_pci_ctrl *apc = irq_data_get_irq_chip_data(d);
|
||
|
+
|
||
|
+ ar2315_pci_reg_mask(apc, AR2315_PCI_IMR, BIT(d->hwirq), 0);
|
||
|
+}
|
||
|
+
|
||
|
+static void ar2315_pci_irq_mask_ack(struct irq_data *d)
|
||
|
+{
|
||
|
+ struct ar2315_pci_ctrl *apc = irq_data_get_irq_chip_data(d);
|
||
|
+ u32 m = BIT(d->hwirq);
|
||
|
+
|
||
|
+ ar2315_pci_reg_mask(apc, AR2315_PCI_IMR, m, 0);
|
||
|
+ ar2315_pci_reg_write(apc, AR2315_PCI_ISR, m);
|
||
|
+}
|
||
|
+
|
||
|
+static void ar2315_pci_irq_unmask(struct irq_data *d)
|
||
|
+{
|
||
|
+ struct ar2315_pci_ctrl *apc = irq_data_get_irq_chip_data(d);
|
||
|
+
|
||
|
+ ar2315_pci_reg_mask(apc, AR2315_PCI_IMR, 0, BIT(d->hwirq));
|
||
|
+}
|
||
|
+
|
||
|
+static struct irq_chip ar2315_pci_irq_chip = {
|
||
|
+ .name = "AR2315-PCI",
|
||
|
+ .irq_mask = ar2315_pci_irq_mask,
|
||
|
+ .irq_mask_ack = ar2315_pci_irq_mask_ack,
|
||
|
+ .irq_unmask = ar2315_pci_irq_unmask,
|
||
|
+};
|
||
|
+
|
||
|
+static int ar2315_pci_irq_map(struct irq_domain *d, unsigned irq,
|
||
|
+ irq_hw_number_t hw)
|
||
|
+{
|
||
|
+ irq_set_chip_and_handler(irq, &ar2315_pci_irq_chip, handle_level_irq);
|
||
|
+ irq_set_chip_data(irq, d->host_data);
|
||
|
+ return 0;
|
||
|
+}
|
||
|
+
|
||
|
+static struct irq_domain_ops ar2315_pci_irq_domain_ops = {
|
||
|
+ .map = ar2315_pci_irq_map,
|
||
|
+};
|
||
|
+
|
||
|
+static void ar2315_pci_irq_init(struct ar2315_pci_ctrl *apc)
|
||
|
+{
|
||
|
+ ar2315_pci_reg_mask(apc, AR2315_PCI_IER, AR2315_PCI_IER_ENABLE, 0);
|
||
|
+ ar2315_pci_reg_mask(apc, AR2315_PCI_IMR, (AR2315_PCI_INT_ABORT |
|
||
|
+ AR2315_PCI_INT_EXT), 0);
|
||
|
+
|
||
|
+ apc->irq_ext = irq_create_mapping(apc->domain, AR2315_PCI_IRQ_EXT);
|
||
|
+
|
||
|
+ irq_set_chained_handler(apc->irq, ar2315_pci_irq_handler);
|
||
|
+ irq_set_handler_data(apc->irq, apc);
|
||
|
+
|
||
|
+ /* Clear any pending Abort or external Interrupts
|
||
|
+ * and enable interrupt processing */
|
||
|
+ ar2315_pci_reg_write(apc, AR2315_PCI_ISR, AR2315_PCI_INT_ABORT |
|
||
|
+ AR2315_PCI_INT_EXT);
|
||
|
+ ar2315_pci_reg_mask(apc, AR2315_PCI_IER, 0, AR2315_PCI_IER_ENABLE);
|
||
|
+}
|
||
|
+
|
||
|
+static int ar2315_pci_probe(struct platform_device *pdev)
|
||
|
+{
|
||
|
+ struct ar2315_pci_ctrl *apc;
|
||
|
+ struct device *dev = &pdev->dev;
|
||
|
+ struct resource *res;
|
||
|
+ int irq, err;
|
||
|
+
|
||
|
+ apc = devm_kzalloc(dev, sizeof(*apc), GFP_KERNEL);
|
||
|
+ if (!apc)
|
||
|
+ return -ENOMEM;
|
||
|
+
|
||
|
+ irq = platform_get_irq(pdev, 0);
|
||
|
+ if (irq < 0)
|
||
|
+ return -EINVAL;
|
||
|
+ apc->irq = irq;
|
||
|
+
|
||
|
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
|
||
|
+ "ar2315-pci-ctrl");
|
||
|
+ apc->mmr_mem = devm_ioremap_resource(dev, res);
|
||
|
+ if (IS_ERR(apc->mmr_mem))
|
||
|
+ return PTR_ERR(apc->mmr_mem);
|
||
|
+
|
||
|
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
|
||
|
+ "ar2315-pci-ext");
|
||
|
+ if (!res)
|
||
|
+ return -EINVAL;
|
||
|
+
|
||
|
+ apc->mem_res.name = "AR2315 PCI mem space";
|
||
|
+ apc->mem_res.parent = res;
|
||
|
+ apc->mem_res.start = res->start;
|
||
|
+ apc->mem_res.end = res->end;
|
||
|
+ apc->mem_res.flags = IORESOURCE_MEM;
|
||
|
+
|
||
|
+ /* Remap PCI config space */
|
||
|
+ apc->cfg_mem = devm_ioremap_nocache(dev, res->start,
|
||
|
+ AR2315_PCI_CFG_SIZE);
|
||
|
+ if (!apc->cfg_mem) {
|
||
|
+ dev_err(dev, "failed to remap PCI config space\n");
|
||
|
+ return -ENOMEM;
|
||
|
+ }
|
||
|
+
|
||
|
+ /* Reset the PCI bus by setting bits 5-4 in PCI_MCFG */
|
||
|
+ ar2315_pci_reg_mask(apc, AR2315_PCI_MISC_CONFIG,
|
||
|
+ AR2315_PCIMISC_RST_MODE,
|
||
|
+ AR2315_PCIRST_LOW);
|
||
|
+ msleep(100);
|
||
|
+
|
||
|
+ /* Bring the PCI out of reset */
|
||
|
+ ar2315_pci_reg_mask(apc, AR2315_PCI_MISC_CONFIG,
|
||
|
+ AR2315_PCIMISC_RST_MODE,
|
||
|
+ AR2315_PCIRST_HIGH | AR2315_PCICACHE_DIS | 0x8);
|
||
|
+
|
||
|
+ ar2315_pci_reg_write(apc, AR2315_PCI_UNCACHE_CFG,
|
||
|
+ 0x1E | /* 1GB uncached */
|
||
|
+ (1 << 5) | /* Enable uncached */
|
||
|
+ (0x2 << 30) /* Base: 0x80000000 */);
|
||
|
+ ar2315_pci_reg_read(apc, AR2315_PCI_UNCACHE_CFG);
|
||
|
+
|
||
|
+ msleep(500);
|
||
|
+
|
||
|
+ err = ar2315_pci_host_setup(apc);
|
||
|
+ if (err)
|
||
|
+ return err;
|
||
|
+
|
||
|
+ apc->domain = irq_domain_add_linear(NULL, AR2315_PCI_IRQ_COUNT,
|
||
|
+ &ar2315_pci_irq_domain_ops, apc);
|
||
|
+ if (!apc->domain) {
|
||
|
+ dev_err(dev, "failed to add IRQ domain\n");
|
||
|
+ return -ENOMEM;
|
||
|
+ }
|
||
|
+
|
||
|
+ ar2315_pci_irq_init(apc);
|
||
|
+
|
||
|
+ /* PCI controller does not support I/O ports */
|
||
|
+ apc->io_res.name = "AR2315 IO space";
|
||
|
+ apc->io_res.start = 0;
|
||
|
+ apc->io_res.end = 0;
|
||
|
+ apc->io_res.flags = IORESOURCE_IO,
|
||
|
+
|
||
|
+ apc->pci_ctrl.pci_ops = &ar2315_pci_ops;
|
||
|
+ apc->pci_ctrl.mem_resource = &apc->mem_res,
|
||
|
+ apc->pci_ctrl.io_resource = &apc->io_res,
|
||
|
+
|
||
|
+ register_pci_controller(&apc->pci_ctrl);
|
||
|
+
|
||
|
+ dev_info(dev, "register PCI controller\n");
|
||
|
+
|
||
|
+ return 0;
|
||
|
+}
|
||
|
+
|
||
|
+static struct platform_driver ar2315_pci_driver = {
|
||
|
+ .probe = ar2315_pci_probe,
|
||
|
+ .driver = {
|
||
|
+ .name = "ar2315-pci",
|
||
|
+ .owner = THIS_MODULE,
|
||
|
+ },
|
||
|
+};
|
||
|
+
|
||
|
+static int __init ar2315_pci_init(void)
|
||
|
+{
|
||
|
+ return platform_driver_register(&ar2315_pci_driver);
|
||
|
+}
|
||
|
+arch_initcall(ar2315_pci_init);
|
||
|
+
|
||
|
+int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
|
||
|
+{
|
||
|
+ struct ar2315_pci_ctrl *apc = ar2315_pci_bus_to_apc(dev->bus);
|
||
|
+
|
||
|
+ return slot ? 0 : apc->irq_ext;
|
||
|
+}
|
||
|
+
|
||
|
+int pcibios_plat_dev_init(struct pci_dev *dev)
|
||
|
+{
|
||
|
+ return 0;
|
||
|
+}
|
||
|
--- a/arch/mips/ath25/Kconfig
|
||
|
+++ b/arch/mips/ath25/Kconfig
|
||
|
@@ -7,3 +7,10 @@ config SOC_AR2315
|
||
|
bool "Atheros AR2315+ SoC support"
|
||
|
depends on ATH25
|
||
|
default y
|
||
|
+
|
||
|
+config PCI_AR2315
|
||
|
+ bool "Atheros AR2315 PCI controller support"
|
||
|
+ depends on SOC_AR2315
|
||
|
+ select HW_HAS_PCI
|
||
|
+ select PCI
|
||
|
+ default y
|
||
|
--- a/arch/mips/ath25/ar2315.c
|
||
|
+++ b/arch/mips/ath25/ar2315.c
|
||
|
@@ -134,6 +134,10 @@ static void ar2315_irq_dispatch(void)
|
||
|
|
||
|
if (pending & CAUSEF_IP3)
|
||
|
do_IRQ(AR2315_IRQ_WLAN0);
|
||
|
+#ifdef CONFIG_PCI_AR2315
|
||
|
+ else if (pending & CAUSEF_IP5)
|
||
|
+ do_IRQ(AR2315_IRQ_LCBUS_PCI);
|
||
|
+#endif
|
||
|
else if (pending & CAUSEF_IP2)
|
||
|
do_IRQ(AR2315_IRQ_MISC);
|
||
|
else if (pending & CAUSEF_IP7)
|
||
|
@@ -299,10 +303,62 @@ void __init ar2315_plat_mem_setup(void)
|
||
|
_machine_restart = ar2315_restart;
|
||
|
}
|
||
|
|
||
|
+#ifdef CONFIG_PCI_AR2315
|
||
|
+static struct resource ar2315_pci_res[] = {
|
||
|
+ {
|
||
|
+ .name = "ar2315-pci-ctrl",
|
||
|
+ .flags = IORESOURCE_MEM,
|
||
|
+ .start = AR2315_PCI_BASE,
|
||
|
+ .end = AR2315_PCI_BASE + AR2315_PCI_SIZE - 1,
|
||
|
+ },
|
||
|
+ {
|
||
|
+ .name = "ar2315-pci-ext",
|
||
|
+ .flags = IORESOURCE_MEM,
|
||
|
+ .start = AR2315_PCI_EXT_BASE,
|
||
|
+ .end = AR2315_PCI_EXT_BASE + AR2315_PCI_EXT_SIZE - 1,
|
||
|
+ },
|
||
|
+ {
|
||
|
+ .name = "ar2315-pci",
|
||
|
+ .flags = IORESOURCE_IRQ,
|
||
|
+ .start = AR2315_IRQ_LCBUS_PCI,
|
||
|
+ .end = AR2315_IRQ_LCBUS_PCI,
|
||
|
+ },
|
||
|
+};
|
||
|
+#endif
|
||
|
+
|
||
|
void __init ar2315_arch_init(void)
|
||
|
{
|
||
|
unsigned irq = irq_create_mapping(ar2315_misc_irq_domain,
|
||
|
AR2315_MISC_IRQ_UART0);
|
||
|
|
||
|
ath25_serial_setup(AR2315_UART0_BASE, irq, ar2315_apb_frequency());
|
||
|
+
|
||
|
+#ifdef CONFIG_PCI_AR2315
|
||
|
+ if (ath25_soc == ATH25_SOC_AR2315) {
|
||
|
+ /* Reset PCI DMA logic */
|
||
|
+ ar2315_rst_reg_mask(AR2315_RESET, 0, AR2315_RESET_PCIDMA);
|
||
|
+ msleep(20);
|
||
|
+ ar2315_rst_reg_mask(AR2315_RESET, AR2315_RESET_PCIDMA, 0);
|
||
|
+ msleep(20);
|
||
|
+
|
||
|
+ /* Configure endians */
|
||
|
+ ar2315_rst_reg_mask(AR2315_ENDIAN_CTL, 0, AR2315_CONFIG_PCIAHB |
|
||
|
+ AR2315_CONFIG_PCIAHB_BRIDGE);
|
||
|
+
|
||
|
+ /* Configure as PCI host with DMA */
|
||
|
+ ar2315_rst_reg_write(AR2315_PCICLK, AR2315_PCICLK_PLLC_CLKM |
|
||
|
+ (AR2315_PCICLK_IN_FREQ_DIV_6 <<
|
||
|
+ AR2315_PCICLK_DIV_S));
|
||
|
+ ar2315_rst_reg_mask(AR2315_AHB_ARB_CTL, 0, AR2315_ARB_PCI);
|
||
|
+ ar2315_rst_reg_mask(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));
|
||
|
+
|
||
|
+ platform_device_register_simple("ar2315-pci", -1,
|
||
|
+ ar2315_pci_res,
|
||
|
+ ARRAY_SIZE(ar2315_pci_res));
|
||
|
+ }
|
||
|
+#endif
|
||
|
}
|