--- /dev/null
+/******************************************************************************
+**
+** 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");
+
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