[SPARC64]: Enable MSI on sun4u Fire PCI-E controllers.

The support code is identical to the hypervisor sun4v stuff,
just replacing the hypervisor calls with register reads and
writes in the Fire controller.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c
index 2395609..7f5a4c7 100644 (file)
--- a/arch/sparc64/kernel/irq.c
+++ b/arch/sparc64/kernel/irq.c
@@ -406,6 +406,18 @@ static void sun4v_irq_disable(unsigned int virt_irq)
 }
 
 #ifdef CONFIG_PCI_MSI
+static void sun4u_msi_enable(unsigned int virt_irq)
+{
+       sun4u_irq_enable(virt_irq);
+       unmask_msi_irq(virt_irq);
+}
+
+static void sun4u_msi_disable(unsigned int virt_irq)
+{
+       mask_msi_irq(virt_irq);
+       sun4u_irq_disable(virt_irq);
+}
+
 static void sun4v_msi_enable(unsigned int virt_irq)
 {
        sun4v_irq_enable(virt_irq);
@@ -583,6 +595,17 @@ static struct irq_chip sun4v_irq_ack = {
 };
 
 #ifdef CONFIG_PCI_MSI
+static struct irq_chip sun4u_msi = {
+       .typename       = "sun4u+msi",
+       .mask           = mask_msi_irq,
+       .unmask         = unmask_msi_irq,
+       .enable         = sun4u_msi_enable,
+       .disable        = sun4u_msi_disable,
+       .ack            = run_pre_handler,
+       .end            = sun4u_irq_end,
+       .set_affinity   = sun4u_set_affinity,
+};
+
 static struct irq_chip sun4v_msi = {
        .typename       = "sun4v+msi",
        .mask           = mask_msi_irq,
@@ -628,6 +651,7 @@ void irq_install_pre_handler(int virt_irq,
            chip == &sun4v_irq_ack ||
            chip == &sun4v_virq_ack
 #ifdef CONFIG_PCI_MSI
+           || chip == &sun4u_msi
            || chip == &sun4v_msi
 #endif
            )
@@ -789,6 +813,53 @@ void sun4v_destroy_msi(unsigned int virt_irq)
 {
        virt_irq_free(virt_irq);
 }
+
+unsigned int sun4u_build_msi(u32 portid, unsigned int *virt_irq_p,
+                            unsigned int msi_start, unsigned int msi_end,
+                            unsigned long imap_base, unsigned long iclr_base)
+{
+       struct ino_bucket *bucket;
+       struct irq_handler_data *data;
+       unsigned long sysino;
+       unsigned int devino;
+
+       /* Find a free devino in the given range.  */
+       for (devino = msi_start; devino < msi_end; devino++) {
+               sysino = (portid << 6) | devino;
+               bucket = &ivector_table[sysino];
+               if (!bucket->virt_irq)
+                       break;
+       }
+       if (devino >= msi_end)
+               return -ENOSPC;
+
+       sysino = (portid << 6) | devino;
+       bucket = &ivector_table[sysino];
+       bucket->virt_irq = virt_irq_alloc(__irq(bucket));
+       *virt_irq_p = bucket->virt_irq;
+       set_irq_chip(bucket->virt_irq, &sun4u_msi);
+
+       data = get_irq_chip_data(bucket->virt_irq);
+       if (unlikely(data))
+               return devino;
+
+       data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
+       if (unlikely(!data)) {
+               virt_irq_free(*virt_irq_p);
+               return -ENOMEM;
+       }
+       set_irq_chip_data(bucket->virt_irq, data);
+
+       data->imap = (imap_base + (devino * 0x8UL));
+       data->iclr = (iclr_base + (devino * 0x8UL));
+
+       return devino;
+}
+
+void sun4u_destroy_msi(unsigned int virt_irq)
+{
+       virt_irq_free(virt_irq);
+}
 #endif
 
 void ack_bad_irq(unsigned int virt_irq)

diff --git a/arch/sparc64/kernel/pci_fire.c b/arch/sparc64/kernel/pci_fire.c
index 14d67fe..090f265 100644 (file)
--- a/arch/sparc64/kernel/pci_fire.c
+++ b/arch/sparc64/kernel/pci_fire.c
@@ -6,9 +6,12 @@
 #include <linux/pci.h>
 #include <linux/slab.h>
 #include <linux/init.h>
+#include <linux/msi.h>
+#include <linux/irq.h>
 
 #include <asm/oplib.h>
 #include <asm/prom.h>
+#include <asm/irq.h>
 
 #include "pci_impl.h"
 
@@ -84,6 +87,440 @@ static int pci_fire_pbm_iommu_init(struct pci_pbm_info *pbm)
        return 0;
 }
 
+#ifdef CONFIG_PCI_MSI
+struct pci_msiq_entry {
+       u64             word0;
+#define MSIQ_WORD0_RESV                        0x8000000000000000UL
+#define MSIQ_WORD0_FMT_TYPE            0x7f00000000000000UL
+#define MSIQ_WORD0_FMT_TYPE_SHIFT      56
+#define MSIQ_WORD0_LEN                 0x00ffc00000000000UL
+#define MSIQ_WORD0_LEN_SHIFT           46
+#define MSIQ_WORD0_ADDR0               0x00003fff00000000UL
+#define MSIQ_WORD0_ADDR0_SHIFT         32
+#define MSIQ_WORD0_RID                 0x00000000ffff0000UL
+#define MSIQ_WORD0_RID_SHIFT           16
+#define MSIQ_WORD0_DATA0               0x000000000000ffffUL
+#define MSIQ_WORD0_DATA0_SHIFT         0
+
+#define MSIQ_TYPE_MSG                  0x6
+#define MSIQ_TYPE_MSI32                        0xb
+#define MSIQ_TYPE_MSI64                        0xf
+
+       u64             word1;
+#define MSIQ_WORD1_ADDR1               0xffffffffffff0000UL
+#define MSIQ_WORD1_ADDR1_SHIFT         16
+#define MSIQ_WORD1_DATA1               0x000000000000ffffUL
+#define MSIQ_WORD1_DATA1_SHIFT         0
+
+       u64             resv[6];
+};
+
+/* All MSI registers are offset from pbm->pbm_regs */
+#define EVENT_QUEUE_BASE_ADDR_REG      0x010000UL
+#define  EVENT_QUEUE_BASE_ADDR_ALL_ONES        0xfffc000000000000UL
+
+#define EVENT_QUEUE_CONTROL_SET(EQ)    (0x011000UL + (EQ) * 0x8UL)
+#define  EVENT_QUEUE_CONTROL_SET_OFLOW 0x0200000000000000UL
+#define  EVENT_QUEUE_CONTROL_SET_EN    0x0000100000000000UL
+
+#define EVENT_QUEUE_CONTROL_CLEAR(EQ)  (0x011200UL + (EQ) * 0x8UL)
+#define  EVENT_QUEUE_CONTROL_CLEAR_OF  0x0200000000000000UL
+#define  EVENT_QUEUE_CONTROL_CLEAR_E2I 0x0000800000000000UL
+#define  EVENT_QUEUE_CONTROL_CLEAR_DIS 0x0000100000000000UL
+
+#define EVENT_QUEUE_STATE(EQ)          (0x011400UL + (EQ) * 0x8UL)
+#define  EVENT_QUEUE_STATE_MASK                0x0000000000000007UL
+#define  EVENT_QUEUE_STATE_IDLE                0x0000000000000001UL
+#define  EVENT_QUEUE_STATE_ACTIVE      0x0000000000000002UL
+#define  EVENT_QUEUE_STATE_ERROR       0x0000000000000004UL
+
+#define EVENT_QUEUE_TAIL(EQ)           (0x011600UL + (EQ) * 0x8UL)
+#define  EVENT_QUEUE_TAIL_OFLOW                0x0200000000000000UL
+#define  EVENT_QUEUE_TAIL_VAL          0x000000000000007fUL
+
+#define EVENT_QUEUE_HEAD(EQ)           (0x011800UL + (EQ) * 0x8UL)
+#define  EVENT_QUEUE_HEAD_VAL          0x000000000000007fUL
+
+#define MSI_MAP(MSI)                   (0x020000UL + (MSI) * 0x8UL)
+#define  MSI_MAP_VALID                 0x8000000000000000UL
+#define  MSI_MAP_EQWR_N                        0x4000000000000000UL
+#define  MSI_MAP_EQNUM                 0x000000000000003fUL
+
+#define MSI_CLEAR(MSI)                 (0x028000UL + (MSI) * 0x8UL)
+#define  MSI_CLEAR_EQWR_N              0x4000000000000000UL
+
+#define IMONDO_DATA0                   0x02C000UL
+#define  IMONDO_DATA0_DATA             0xffffffffffffffc0UL
+
+#define IMONDO_DATA1                   0x02C008UL
+#define  IMONDO_DATA1_DATA             0xffffffffffffffffUL
+
+#define MSI_32BIT_ADDR                 0x034000UL
+#define  MSI_32BIT_ADDR_VAL            0x00000000ffff0000UL
+
+#define MSI_64BIT_ADDR                 0x034008UL
+#define  MSI_64BIT_ADDR_VAL            0xffffffffffff0000UL
+
+/* For now this just runs as a pre-handler for the real interrupt handler.
+ * So we just walk through the queue and ACK all the entries, update the
+ * head pointer, and return.
+ *
+ * In the longer term it would be nice to do something more integrated
+ * wherein we can pass in some of this MSI info to the drivers.  This
+ * would be most useful for PCIe fabric error messages, although we could
+ * invoke those directly from the loop here in order to pass the info around.
+ */
+static void pci_msi_prehandler(unsigned int ino, void *data1, void *data2)
+{
+       unsigned long msiqid, orig_head, head, type_fmt, type;
+       struct pci_pbm_info *pbm = data1;
+       struct pci_msiq_entry *base, *ep;
+
+       msiqid = (unsigned long) data2;
+
+       head = fire_read(pbm->pbm_regs + EVENT_QUEUE_HEAD(msiqid));
+
+       orig_head = head;
+       base = (pbm->msi_queues + ((msiqid - pbm->msiq_first) * 8192));
+       ep = &base[head];
+       while ((ep->word0 & MSIQ_WORD0_FMT_TYPE) != 0) {
+               unsigned long msi_num;
+
+               type_fmt = ((ep->word0 & MSIQ_WORD0_FMT_TYPE) >>
+                           MSIQ_WORD0_FMT_TYPE_SHIFT);
+               type = (type_fmt >>3);
+               if (unlikely(type != MSIQ_TYPE_MSI32 &&
+                            type != MSIQ_TYPE_MSI64))
+                       goto bad_type;
+
+               msi_num = ((ep->word0 & MSIQ_WORD0_DATA0) >>
+                          MSIQ_WORD0_DATA0_SHIFT);
+
+               fire_write(pbm->pbm_regs + MSI_CLEAR(msi_num),
+                          MSI_CLEAR_EQWR_N);
+
+               /* Clear the entry.  */
+               ep->word0 &= ~MSIQ_WORD0_FMT_TYPE;
+
+               /* Go to next entry in ring.  */
+               head++;
+               if (head >= pbm->msiq_ent_count)
+                       head = 0;
+               ep = &base[head];
+       }
+
+       if (likely(head != orig_head)) {
+               /* ACK entries by updating head pointer.  */
+               fire_write(pbm->pbm_regs +
+                          EVENT_QUEUE_HEAD(msiqid),
+                          head);
+       }
+       return;
+
+bad_type:
+       printk(KERN_EMERG "MSI: Entry has bad type %lx\n", type);
+       return;
+}
+
+static int msi_bitmap_alloc(struct pci_pbm_info *pbm)
+{
+       unsigned long size, bits_per_ulong;
+
+       bits_per_ulong = sizeof(unsigned long) * 8;
+       size = (pbm->msi_num + (bits_per_ulong - 1)) & ~(bits_per_ulong - 1);
+       size /= 8;
+       BUG_ON(size % sizeof(unsigned long));
+
+       pbm->msi_bitmap = kzalloc(size, GFP_KERNEL);
+       if (!pbm->msi_bitmap)
+               return -ENOMEM;
+
+       return 0;
+}
+
+static void msi_bitmap_free(struct pci_pbm_info *pbm)
+{
+       kfree(pbm->msi_bitmap);
+       pbm->msi_bitmap = NULL;
+}
+
+static int msi_queue_alloc(struct pci_pbm_info *pbm)
+{
+       unsigned long pages, order, i;
+
+       order = get_order(512 * 1024);
+       pages = __get_free_pages(GFP_KERNEL | __GFP_COMP, order);
+       if (pages == 0UL) {
+               printk(KERN_ERR "MSI: Cannot allocate MSI queues (o=%lu).\n",
+                      order);
+               return -ENOMEM;
+       }
+       memset((char *)pages, 0, PAGE_SIZE << order);
+       pbm->msi_queues = (void *) pages;
+
+       fire_write(pbm->pbm_regs + EVENT_QUEUE_BASE_ADDR_REG,
+                  (EVENT_QUEUE_BASE_ADDR_ALL_ONES |
+                   __pa(pbm->msi_queues)));
+
+       fire_write(pbm->pbm_regs + IMONDO_DATA0,
+                  pbm->portid << 6);
+       fire_write(pbm->pbm_regs + IMONDO_DATA1, 0);
+
+       fire_write(pbm->pbm_regs + MSI_32BIT_ADDR,
+                  pbm->msi32_start);
+       fire_write(pbm->pbm_regs + MSI_64BIT_ADDR,
+                  pbm->msi64_start);
+
+       for (i = 0; i < pbm->msiq_num; i++) {
+               fire_write(pbm->pbm_regs + EVENT_QUEUE_HEAD(i), 0);
+               fire_write(pbm->pbm_regs + EVENT_QUEUE_TAIL(i), 0);
+       }
+
+       return 0;
+}
+
+static int alloc_msi(struct pci_pbm_info *pbm)
+{
+       int i;
+
+       for (i = 0; i < pbm->msi_num; i++) {
+               if (!test_and_set_bit(i, pbm->msi_bitmap))
+                       return i + pbm->msi_first;
+       }
+
+       return -ENOENT;
+}
+
+static void free_msi(struct pci_pbm_info *pbm, int msi_num)
+{
+       msi_num -= pbm->msi_first;
+       clear_bit(msi_num, pbm->msi_bitmap);
+}
+
+static int pci_setup_msi_irq(unsigned int *virt_irq_p,
+                            struct pci_dev *pdev,
+                            struct msi_desc *entry)
+{
+       struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
+       unsigned long devino, msiqid, cregs, imap_off;
+       struct msi_msg msg;
+       int msi_num, err;
+       u64 val;
+
+       *virt_irq_p = 0;
+
+       msi_num = alloc_msi(pbm);
+       if (msi_num < 0)
+               return msi_num;
+
+       cregs = (unsigned long) pbm->pbm_regs;
+
+       err = sun4u_build_msi(pbm->portid, virt_irq_p,
+                             pbm->msiq_first_devino,
+                             (pbm->msiq_first_devino +
+                              pbm->msiq_num),
+                             cregs + 0x001000UL,
+                             cregs + 0x001400UL);
+       if (err < 0)
+               goto out_err;
+       devino = err;
+
+       imap_off = 0x001000UL + (devino * 0x8UL);
+
+       val = fire_read(pbm->pbm_regs + imap_off);
+       val |= (1UL << 63) | (1UL << 6);
+       fire_write(pbm->pbm_regs + imap_off, val);
+
+       msiqid = ((devino - pbm->msiq_first_devino) +
+                 pbm->msiq_first);
+
+       fire_write(pbm->pbm_regs +
+                  EVENT_QUEUE_CONTROL_SET(msiqid),
+                  EVENT_QUEUE_CONTROL_SET_EN);
+
+       val = fire_read(pbm->pbm_regs + MSI_MAP(msi_num));
+       val &= ~(MSI_MAP_EQNUM);
+       val |= msiqid;
+       fire_write(pbm->pbm_regs + MSI_MAP(msi_num), val);
+
+       fire_write(pbm->pbm_regs + MSI_CLEAR(msi_num),
+                  MSI_CLEAR_EQWR_N);
+
+       val = fire_read(pbm->pbm_regs + MSI_MAP(msi_num));
+       val |= MSI_MAP_VALID;
+       fire_write(pbm->pbm_regs + MSI_MAP(msi_num), val);
+
+       sparc64_set_msi(*virt_irq_p, msi_num);
+
+       if (entry->msi_attrib.is_64) {
+               msg.address_hi = pbm->msi64_start >> 32;
+               msg.address_lo = pbm->msi64_start & 0xffffffff;
+       } else {
+               msg.address_hi = 0;
+               msg.address_lo = pbm->msi32_start;
+       }
+       msg.data = msi_num;
+
+       set_irq_msi(*virt_irq_p, entry);
+       write_msi_msg(*virt_irq_p, &msg);
+
+       irq_install_pre_handler(*virt_irq_p,
+                               pci_msi_prehandler,
+                               pbm, (void *) msiqid);
+
+       return 0;
+
+out_err:
+       free_msi(pbm, msi_num);
+       return err;
+}
+
+static void pci_teardown_msi_irq(unsigned int virt_irq,
+                                struct pci_dev *pdev)
+{
+       struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
+       unsigned long msiqid, msi_num;
+       u64 val;
+
+       msi_num = sparc64_get_msi(virt_irq);
+
+       val = fire_read(pbm->pbm_regs + MSI_MAP(msi_num));
+
+       msiqid = (val & MSI_MAP_EQNUM);
+
+       val &= ~MSI_MAP_VALID;
+       fire_write(pbm->pbm_regs + MSI_MAP(msi_num), val);
+
+       fire_write(pbm->pbm_regs + EVENT_QUEUE_CONTROL_CLEAR(msiqid),
+                  EVENT_QUEUE_CONTROL_CLEAR_DIS);
+
+       free_msi(pbm, msi_num);
+
+       /* The sun4u_destroy_msi() will liberate the devino and thus the MSIQ
+        * allocation.
+        */
+       sun4u_destroy_msi(virt_irq);
+}
+
+static void pci_fire_msi_init(struct pci_pbm_info *pbm)
+{
+       const u32 *val;
+       int len;
+
+       val = of_get_property(pbm->prom_node, "#msi-eqs", &len);
+       if (!val || len != 4)
+               goto no_msi;
+       pbm->msiq_num = *val;
+       if (pbm->msiq_num) {
+               const struct msiq_prop {
+                       u32 first_msiq;
+                       u32 num_msiq;
+                       u32 first_devino;
+               } *mqp;
+               const struct msi_range_prop {
+                       u32 first_msi;
+                       u32 num_msi;
+               } *mrng;
+               const struct addr_range_prop {
+                       u32 msi32_high;
+                       u32 msi32_low;
+                       u32 msi32_len;
+                       u32 msi64_high;
+                       u32 msi64_low;
+                       u32 msi64_len;
+               } *arng;
+
+               val = of_get_property(pbm->prom_node, "msi-eq-size", &len);
+               if (!val || len != 4)
+                       goto no_msi;
+
+               pbm->msiq_ent_count = *val;
+
+               mqp = of_get_property(pbm->prom_node,
+                                     "msi-eq-to-devino", &len);
+               if (!mqp)
+                       mqp = of_get_property(pbm->prom_node,
+                                             "msi-eq-devino", &len);
+               if (!mqp || len != sizeof(struct msiq_prop))
+                       goto no_msi;
+
+               pbm->msiq_first = mqp->first_msiq;
+               pbm->msiq_first_devino = mqp->first_devino;
+
+               val = of_get_property(pbm->prom_node, "#msi", &len);
+               if (!val || len != 4)
+                       goto no_msi;
+               pbm->msi_num = *val;
+
+               mrng = of_get_property(pbm->prom_node, "msi-ranges", &len);
+               if (!mrng || len != sizeof(struct msi_range_prop))
+                       goto no_msi;
+               pbm->msi_first = mrng->first_msi;
+
+               val = of_get_property(pbm->prom_node, "msi-data-mask", &len);
+               if (!val || len != 4)
+                       goto no_msi;
+               pbm->msi_data_mask = *val;
+
+               val = of_get_property(pbm->prom_node, "msix-data-width", &len);
+               if (!val || len != 4)
+                       goto no_msi;
+               pbm->msix_data_width = *val;
+
+               arng = of_get_property(pbm->prom_node, "msi-address-ranges",
+                                      &len);
+               if (!arng || len != sizeof(struct addr_range_prop))
+                       goto no_msi;
+               pbm->msi32_start = ((u64)arng->msi32_high << 32) |
+                       (u64) arng->msi32_low;
+               pbm->msi64_start = ((u64)arng->msi64_high << 32) |
+                       (u64) arng->msi64_low;
+               pbm->msi32_len = arng->msi32_len;
+               pbm->msi64_len = arng->msi64_len;
+
+               if (msi_bitmap_alloc(pbm))
+                       goto no_msi;
+
+               if (msi_queue_alloc(pbm)) {
+                       msi_bitmap_free(pbm);
+                       goto no_msi;
+               }
+
+               printk(KERN_INFO "%s: MSI Queue first[%u] num[%u] count[%u] "
+                      "devino[0x%x]\n",
+                      pbm->name,
+                      pbm->msiq_first, pbm->msiq_num,
+                      pbm->msiq_ent_count,
+                      pbm->msiq_first_devino);
+               printk(KERN_INFO "%s: MSI first[%u] num[%u] mask[0x%x] "
+                      "width[%u]\n",
+                      pbm->name,
+                      pbm->msi_first, pbm->msi_num, pbm->msi_data_mask,
+                      pbm->msix_data_width);
+               printk(KERN_INFO "%s: MSI addr32[0x%lx:0x%x] "
+                      "addr64[0x%lx:0x%x]\n",
+                      pbm->name,
+                      pbm->msi32_start, pbm->msi32_len,
+                      pbm->msi64_start, pbm->msi64_len);
+               printk(KERN_INFO "%s: MSI queues at RA [%016lx]\n",
+                      pbm->name,
+                      __pa(pbm->msi_queues));
+       }
+       pbm->setup_msi_irq = pci_setup_msi_irq;
+       pbm->teardown_msi_irq = pci_teardown_msi_irq;
+
+       return;
+
+no_msi:
+       pbm->msiq_num = 0;
+       printk(KERN_INFO "%s: No MSI support.\n", pbm->name);
+}
+#else /* CONFIG_PCI_MSI */
+static void pci_fire_msi_init(struct pci_pbm_info *pbm)
+{
+}
+#endif /* !(CONFIG_PCI_MSI) */
+
 /* Based at pbm->controller_regs */
 #define FIRE_PARITY_CONTROL    0x470010UL
 #define  FIRE_PARITY_ENAB      0x8000000000000000UL
@@ -176,6 +613,7 @@ static int pci_fire_pbm_init(struct pci_controller_info *p,
 {
        const struct linux_prom64_registers *regs;
        struct pci_pbm_info *pbm;
+       int err;
 
        if ((portid & 1) == 0)
                pbm = &p->pbm_A;
@@ -208,7 +646,13 @@ static int pci_fire_pbm_init(struct pci_controller_info *p,
 
        pci_fire_hw_init(pbm);
 
-       return pci_fire_pbm_iommu_init(pbm);
+       err = pci_fire_pbm_iommu_init(pbm);
+       if (err)
+               return err;
+
+       pci_fire_msi_init(pbm);
+
+       return 0;
 }
 
 static inline int portid_compare(u32 x, u32 y)

diff --git a/include/asm-sparc64/irq.h b/include/asm-sparc64/irq.h
index c00ad15..4de3725 100644 (file)
--- a/include/asm-sparc64/irq.h
+++ b/include/asm-sparc64/irq.h
@@ -51,6 +51,12 @@ extern unsigned int sun4v_build_msi(u32 devhandle, unsigned int *virt_irq_p,
                                    unsigned int msi_devino_start,
                                    unsigned int msi_devino_end);
 extern void sun4v_destroy_msi(unsigned int virt_irq);
+extern unsigned int sun4u_build_msi(u32 portid, unsigned int *virt_irq_p,
+                                   unsigned int msi_devino_start,
+                                   unsigned int msi_devino_end,
+                                   unsigned long imap_base,
+                                   unsigned long iclr_base);
+extern void sun4u_destroy_msi(unsigned int virt_irq);
 extern unsigned int sbus_build_irq(void *sbus, unsigned int ino);
 
 extern void sparc64_set_msi(unsigned int virt_irq, u32 msi);