branch Attitude Adjustment

git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@33625 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 399 insertions, 0 deletions

diff --git a/target/linux/lantiq/files/arch/mips/pci/pcie-lantiq-msi.c b/target/linux/lantiq/files/arch/mips/pci/pcie-lantiq-msi.c
new file mode 100644
index 000000000..9cbf639bb
--- /dev/null
+++ b/target/linux/lantiq/files/arch/mips/pci/pcie-lantiq-msi.c
@@ -0,0 +1,399 @@
+/******************************************************************************
+**
+** FILE NAME    : ifxmips_pcie_msi.c
+** PROJECT      : IFX UEIP for VRX200
+** MODULES      : PCI MSI sub module
+**
+** DATE         : 02 Mar 2009
+** AUTHOR       : Lei Chuanhua
+** DESCRIPTION  : PCIe MSI Driver
+** COPYRIGHT    :       Copyright (c) 2009
+**                      Infineon Technologies AG
+**                      Am Campeon 1-12, 85579 Neubiberg, Germany
+**
+**    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.
+** HISTORY
+** $Date        $Author         $Comment
+** 02 Mar,2009  Lei Chuanhua    Initial version
+*******************************************************************************/
+/*!
+ \defgroup IFX_PCIE_MSI MSI OS APIs
+ \ingroup IFX_PCIE
+ \brief PCIe bus driver OS interface functions
+*/
+
+/*!
+ \file ifxmips_pcie_msi.c
+ \ingroup IFX_PCIE 
+ \brief PCIe MSI OS interface file
+*/
+
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+#include <linux/pci.h>
+#include <linux/msi.h>
+#include <linux/module.h>
+#include <asm/bootinfo.h>
+#include <asm/irq.h>
+#include <asm/traps.h>
+
+#include "pcie-lantiq.h"
+
+#define IFX_MSI_IRQ_NUM    16
+#define SM(_v, _f)		(((_v) << _f##_S) & (_f))
+
+#define IFX_MSI_PIC_REG_BASE                    (KSEG1 | 0x1F700000)
+#define IFX_PCIE_MSI_IR0                (INT_NUM_IM4_IRL0 + 27)
+#define IFX_PCIE_MSI_IR1                (INT_NUM_IM4_IRL0 + 28)
+#define IFX_PCIE_MSI_IR2                (INT_NUM_IM4_IRL0 + 29)
+#define IFX_PCIE_MSI_IR3                (INT_NUM_IM0_IRL0 + 30)
+
+#define IFX_MSI_PCI_INT_DISABLE                 0x80000000
+#define IFX_MSI_PIC_INT_LINE                    0x30000000
+#define IFX_MSI_PIC_MSG_ADDR                    0x0FFF0000
+#define IFX_MSI_PIC_MSG_DATA                    0x0000FFFF
+#define IFX_MSI_PIC_BIG_ENDIAN                  1
+#define IFX_MSI_PIC_INT_LINE_S                  28
+#define IFX_MSI_PIC_MSG_ADDR_S                  16
+#define IFX_MSI_PIC_MSG_DATA_S                  0x0
+
+enum {
+    IFX_PCIE_MSI_IDX0 = 0,
+    IFX_PCIE_MSI_IDX1,
+    IFX_PCIE_MSI_IDX2,
+    IFX_PCIE_MSI_IDX3,
+};
+
+typedef struct ifx_msi_irq_idx {
+    const int irq;
+    const int idx;
+}ifx_msi_irq_idx_t;
+
+struct ifx_msi_pic {
+    volatile u32  pic_table[IFX_MSI_IRQ_NUM];
+    volatile u32  pic_endian;    /* 0x40  */
+};
+typedef struct ifx_msi_pic *ifx_msi_pic_t;
+
+typedef struct ifx_msi_irq {
+    const volatile ifx_msi_pic_t msi_pic_p;
+    const u32 msi_phy_base;
+    const ifx_msi_irq_idx_t msi_irq_idx[IFX_MSI_IRQ_NUM];
+    /*
+     * Each bit in msi_free_irq_bitmask represents a MSI interrupt that is 
+     * in use.
+     */
+    u16 msi_free_irq_bitmask;
+
+    /*
+     * Each bit in msi_multiple_irq_bitmask tells that the device using 
+     * this bit in msi_free_irq_bitmask is also using the next bit. This 
+     * is used so we can disable all of the MSI interrupts when a device 
+     * uses multiple.
+     */
+    u16 msi_multiple_irq_bitmask;
+}ifx_msi_irq_t;
+
+static ifx_msi_irq_t msi_irqs[IFX_PCIE_CORE_NR] = {
+    {
+        .msi_pic_p = (const volatile ifx_msi_pic_t)IFX_MSI_PIC_REG_BASE,
+        .msi_phy_base = PCIE_MSI_PHY_BASE,
+        .msi_irq_idx = {
+            {IFX_PCIE_MSI_IR0, IFX_PCIE_MSI_IDX0}, {IFX_PCIE_MSI_IR1, IFX_PCIE_MSI_IDX1},
+            {IFX_PCIE_MSI_IR2, IFX_PCIE_MSI_IDX2}, {IFX_PCIE_MSI_IR3, IFX_PCIE_MSI_IDX3},
+            {IFX_PCIE_MSI_IR0, IFX_PCIE_MSI_IDX0}, {IFX_PCIE_MSI_IR1, IFX_PCIE_MSI_IDX1},
+            {IFX_PCIE_MSI_IR2, IFX_PCIE_MSI_IDX2}, {IFX_PCIE_MSI_IR3, IFX_PCIE_MSI_IDX3},
+            {IFX_PCIE_MSI_IR0, IFX_PCIE_MSI_IDX0}, {IFX_PCIE_MSI_IR1, IFX_PCIE_MSI_IDX1},
+            {IFX_PCIE_MSI_IR2, IFX_PCIE_MSI_IDX2}, {IFX_PCIE_MSI_IR3, IFX_PCIE_MSI_IDX3},
+            {IFX_PCIE_MSI_IR0, IFX_PCIE_MSI_IDX0}, {IFX_PCIE_MSI_IR1, IFX_PCIE_MSI_IDX1},
+            {IFX_PCIE_MSI_IR2, IFX_PCIE_MSI_IDX2}, {IFX_PCIE_MSI_IR3, IFX_PCIE_MSI_IDX3},
+        },
+        .msi_free_irq_bitmask = 0,
+        .msi_multiple_irq_bitmask= 0,
+    },
+#ifdef CONFIG_IFX_PCIE_2ND_CORE
+    {
+        .msi_pic_p = (const volatile ifx_msi_pic_t)IFX_MSI1_PIC_REG_BASE,
+        .msi_phy_base = PCIE1_MSI_PHY_BASE,
+        .msi_irq_idx = {
+            {IFX_PCIE1_MSI_IR0, IFX_PCIE_MSI_IDX0}, {IFX_PCIE1_MSI_IR1, IFX_PCIE_MSI_IDX1},
+            {IFX_PCIE1_MSI_IR2, IFX_PCIE_MSI_IDX2}, {IFX_PCIE1_MSI_IR3, IFX_PCIE_MSI_IDX3},
+            {IFX_PCIE1_MSI_IR0, IFX_PCIE_MSI_IDX0}, {IFX_PCIE1_MSI_IR1, IFX_PCIE_MSI_IDX1},
+            {IFX_PCIE1_MSI_IR2, IFX_PCIE_MSI_IDX2}, {IFX_PCIE1_MSI_IR3, IFX_PCIE_MSI_IDX3},
+            {IFX_PCIE1_MSI_IR0, IFX_PCIE_MSI_IDX0}, {IFX_PCIE1_MSI_IR1, IFX_PCIE_MSI_IDX1},
+            {IFX_PCIE1_MSI_IR2, IFX_PCIE_MSI_IDX2}, {IFX_PCIE1_MSI_IR3, IFX_PCIE_MSI_IDX3},
+            {IFX_PCIE1_MSI_IR0, IFX_PCIE_MSI_IDX0}, {IFX_PCIE1_MSI_IR1, IFX_PCIE_MSI_IDX1},
+            {IFX_PCIE1_MSI_IR2, IFX_PCIE_MSI_IDX2}, {IFX_PCIE1_MSI_IR3, IFX_PCIE_MSI_IDX3},
+        },
+        .msi_free_irq_bitmask = 0,
+        .msi_multiple_irq_bitmask= 0,
+
+    },
+#endif /* CONFIG_IFX_PCIE_2ND_CORE */
+};
+
+/* 
+ * This lock controls updates to msi_free_irq_bitmask, 
+ * msi_multiple_irq_bitmask and pic register settting
+ */ 
+static DEFINE_SPINLOCK(ifx_pcie_msi_lock);
+
+void pcie_msi_pic_init(int pcie_port)
+{
+    spin_lock(&ifx_pcie_msi_lock);
+    msi_irqs[pcie_port].msi_pic_p->pic_endian = IFX_MSI_PIC_BIG_ENDIAN;
+    spin_unlock(&ifx_pcie_msi_lock);
+}
+
+/** 
+ * \fn int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
+ * \brief Called when a driver request MSI interrupts instead of the 
+ * legacy INT A-D. This routine will allocate multiple interrupts 
+ * for MSI devices that support them. A device can override this by 
+ * programming the MSI control bits [6:4] before calling 
+ * pci_enable_msi(). 
+ * 
+ * \param[in] pdev   Device requesting MSI interrupts 
+ * \param[in] desc   MSI descriptor 
+ * 
+ * \return   -EINVAL Invalid pcie root port or invalid msi bit
+ * \return    0        OK
+ * \ingroup IFX_PCIE_MSI
+ */
+int 
+arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
+{
+    int  irq, pos;
+    u16  control;
+    int  irq_idx;
+    int  irq_step;
+    int configured_private_bits;
+    int request_private_bits;
+    struct msi_msg msg;
+    u16 search_mask;
+    struct ifx_pci_controller *ctrl = pdev->bus->sysdata;
+    int pcie_port = ctrl->port;
+
+    IFX_PCIE_PRINT(PCIE_MSG_MSI, "%s %s enter\n", __func__, pci_name(pdev));
+
+    /* XXX, skip RC MSI itself */
+    if (pdev->pcie_type == PCI_EXP_TYPE_ROOT_PORT) {
+        IFX_PCIE_PRINT(PCIE_MSG_MSI, "%s RC itself doesn't use MSI interrupt\n", __func__);
+        return -EINVAL;
+    }
+
+    /*
+     * Read the MSI config to figure out how many IRQs this device 
+     * wants.  Most devices only want 1, which will give 
+     * configured_private_bits and request_private_bits equal 0. 
+     */
+    pci_read_config_word(pdev, desc->msi_attrib.pos + PCI_MSI_FLAGS, &control);
+
+    /*
+     * If the number of private bits has been configured then use 
+     * that value instead of the requested number. This gives the 
+     * driver the chance to override the number of interrupts 
+     * before calling pci_enable_msi(). 
+     */
+    configured_private_bits = (control & PCI_MSI_FLAGS_QSIZE) >> 4; 
+    if (configured_private_bits == 0) {
+        /* Nothing is configured, so use the hardware requested size */
+        request_private_bits = (control & PCI_MSI_FLAGS_QMASK) >> 1;
+    }
+    else {
+        /*
+         * Use the number of configured bits, assuming the 
+         * driver wanted to override the hardware request 
+         * value.
+         */
+        request_private_bits = configured_private_bits;
+    }
+
+    /*
+     * The PCI 2.3 spec mandates that there are at most 32
+     * interrupts. If this device asks for more, only give it one.
+     */
+    if (request_private_bits > 5) {
+        request_private_bits = 0;
+    }
+again:
+    /*
+     * The IRQs have to be aligned on a power of two based on the
+     * number being requested.
+     */
+    irq_step = (1 << request_private_bits);
+
+    /* Mask with one bit for each IRQ */
+    search_mask = (1 << irq_step) - 1;
+
+    /*
+     * We're going to search msi_free_irq_bitmask_lock for zero 
+     * bits. This represents an MSI interrupt number that isn't in 
+     * use.
+     */
+    spin_lock(&ifx_pcie_msi_lock);
+    for (pos = 0; pos < IFX_MSI_IRQ_NUM; pos += irq_step) {
+        if ((msi_irqs[pcie_port].msi_free_irq_bitmask & (search_mask << pos)) == 0) {
+            msi_irqs[pcie_port].msi_free_irq_bitmask |= search_mask << pos; 
+            msi_irqs[pcie_port].msi_multiple_irq_bitmask |= (search_mask >> 1) << pos;
+            break; 
+        }
+    }
+    spin_unlock(&ifx_pcie_msi_lock); 
+
+    /* Make sure the search for available interrupts didn't fail */ 
+    if (pos >= IFX_MSI_IRQ_NUM) {
+        if (request_private_bits) {
+            IFX_PCIE_PRINT(PCIE_MSG_MSI, "%s: Unable to find %d free "
+                  "interrupts, trying just one", __func__, 1 << request_private_bits);
+            request_private_bits = 0;
+            goto again;
+        }
+        else {
+            printk(KERN_ERR "%s: Unable to find a free MSI interrupt\n", __func__);
+            return -EINVAL;
+        }
+    } 
+    irq = msi_irqs[pcie_port].msi_irq_idx[pos].irq;
+    irq_idx = msi_irqs[pcie_port].msi_irq_idx[pos].idx;
+
+    IFX_PCIE_PRINT(PCIE_MSG_MSI, "pos %d, irq %d irq_idx %d\n", pos, irq, irq_idx);
+
+    /*
+     * Initialize MSI. This has to match the memory-write endianess from the device 
+     * Address bits [23:12]
+     */
+    spin_lock(&ifx_pcie_msi_lock); 
+    msi_irqs[pcie_port].msi_pic_p->pic_table[pos] = SM(irq_idx, IFX_MSI_PIC_INT_LINE) |
+                    SM((msi_irqs[pcie_port].msi_phy_base >> 12), IFX_MSI_PIC_MSG_ADDR) |
+                    SM((1 << pos), IFX_MSI_PIC_MSG_DATA);
+
+    /* Enable this entry */
+    msi_irqs[pcie_port].msi_pic_p->pic_table[pos] &= ~IFX_MSI_PCI_INT_DISABLE;
+    spin_unlock(&ifx_pcie_msi_lock);
+
+    IFX_PCIE_PRINT(PCIE_MSG_MSI, "pic_table[%d]: 0x%08x\n",
+        pos, msi_irqs[pcie_port].msi_pic_p->pic_table[pos]);
+
+    /* Update the number of IRQs the device has available to it */
+    control &= ~PCI_MSI_FLAGS_QSIZE;
+    control |= (request_private_bits << 4);
+    pci_write_config_word(pdev, desc->msi_attrib.pos + PCI_MSI_FLAGS, control);
+
+    irq_set_msi_desc(irq, desc);
+    msg.address_hi = 0x0;
+    msg.address_lo = msi_irqs[pcie_port].msi_phy_base;
+    msg.data = SM((1 << pos), IFX_MSI_PIC_MSG_DATA);
+    IFX_PCIE_PRINT(PCIE_MSG_MSI, "msi_data: pos %d 0x%08x\n", pos, msg.data);
+
+    write_msi_msg(irq, &msg);
+    IFX_PCIE_PRINT(PCIE_MSG_MSI, "%s exit\n", __func__);
+    return 0;
+}
+
+static int
+pcie_msi_irq_to_port(unsigned int irq, int *port)
+{
+    int ret = 0;
+
+    if (irq == IFX_PCIE_MSI_IR0 || irq == IFX_PCIE_MSI_IR1 ||
+        irq == IFX_PCIE_MSI_IR2 || irq == IFX_PCIE_MSI_IR3) {
+        *port = IFX_PCIE_PORT0;
+    }
+#ifdef CONFIG_IFX_PCIE_2ND_CORE
+    else if (irq == IFX_PCIE1_MSI_IR0 || irq == IFX_PCIE1_MSI_IR1 ||
+        irq == IFX_PCIE1_MSI_IR2 || irq == IFX_PCIE1_MSI_IR3) {
+        *port = IFX_PCIE_PORT1;
+    }
+#endif /* CONFIG_IFX_PCIE_2ND_CORE */
+    else {
+        printk(KERN_ERR "%s: Attempted to teardown illegal " 
+            "MSI interrupt (%d)\n", __func__, irq);
+        ret = -EINVAL;
+    }
+    return ret;
+}
+
+/** 
+ * \fn void arch_teardown_msi_irq(unsigned int irq)
+ * \brief Called when a device no longer needs its MSI interrupts. All 
+ * MSI interrupts for the device are freed. 
+ * 
+ * \param irq   The devices first irq number. There may be multple in sequence.
+ * \return none
+ * \ingroup IFX_PCIE_MSI
+ */
+void 
+arch_teardown_msi_irq(unsigned int irq)
+{
+    int pos;
+    int number_irqs; 
+    u16 bitmask;
+    int pcie_port;
+
+    IFX_PCIE_PRINT(PCIE_MSG_MSI, "%s enter\n", __func__);
+
+    BUG_ON(irq > (INT_NUM_IM4_IRL0 + 31));
+
+    if (pcie_msi_irq_to_port(irq, &pcie_port) != 0) {
+        return;
+    }
+
+    /* Shift the mask to the correct bit location, not always correct 
+     * Probally, the first match will be chosen.
+     */
+    for (pos = 0; pos < IFX_MSI_IRQ_NUM; pos++) {
+        if ((msi_irqs[pcie_port].msi_irq_idx[pos].irq == irq) 
+            && (msi_irqs[pcie_port].msi_free_irq_bitmask & ( 1 << pos))) {
+            break;
+        }
+    }
+    if (pos >= IFX_MSI_IRQ_NUM) {
+        printk(KERN_ERR "%s: Unable to find a matched MSI interrupt\n", __func__);
+        return;
+    }
+    spin_lock(&ifx_pcie_msi_lock);
+    /* Disable this entry */
+    msi_irqs[pcie_port].msi_pic_p->pic_table[pos] |= IFX_MSI_PCI_INT_DISABLE;
+    msi_irqs[pcie_port].msi_pic_p->pic_table[pos] &= ~(IFX_MSI_PIC_INT_LINE | IFX_MSI_PIC_MSG_ADDR | IFX_MSI_PIC_MSG_DATA);
+    spin_unlock(&ifx_pcie_msi_lock); 
+    /*
+     * Count the number of IRQs we need to free by looking at the
+     * msi_multiple_irq_bitmask. Each bit set means that the next
+     * IRQ is also owned by this device.
+     */ 
+    number_irqs = 0; 
+    while (((pos + number_irqs) < IFX_MSI_IRQ_NUM) && 
+        (msi_irqs[pcie_port].msi_multiple_irq_bitmask & (1 << (pos + number_irqs)))) {
+        number_irqs++;
+    }
+    number_irqs++;
+
+    /* Mask with one bit for each IRQ */
+    bitmask = (1 << number_irqs) - 1;
+
+    bitmask <<= pos;
+    if ((msi_irqs[pcie_port].msi_free_irq_bitmask & bitmask) != bitmask) {
+        printk(KERN_ERR "%s: Attempted to teardown MSI "
+             "interrupt (%d) not in use\n", __func__, irq);
+        return;
+    }
+    /* Checks are done, update the in use bitmask */
+    spin_lock(&ifx_pcie_msi_lock);
+    msi_irqs[pcie_port].msi_free_irq_bitmask &= ~bitmask;
+    msi_irqs[pcie_port].msi_multiple_irq_bitmask &= ~(bitmask >> 1);
+    spin_unlock(&ifx_pcie_msi_lock);
+    IFX_PCIE_PRINT(PCIE_MSG_MSI, "%s exit\n", __func__);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Chuanhua.Lei@infineon.com");
+MODULE_SUPPORTED_DEVICE("Infineon PCIe IP builtin MSI PIC module");
+MODULE_DESCRIPTION("Infineon PCIe IP builtin MSI PIC driver");
+