[PARISC] Add support for Quicksilver AGPGART

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

4 files changed, 450 insertions, 12 deletions

diff --git a/drivers/char/agp/Kconfig b/drivers/char/agp/Kconfig
index 22f8cf218cc6..c603bf291580 100644
--- a/drivers/char/agp/Kconfig
+++ b/drivers/char/agp/Kconfig
@@ -1,6 +1,6 @@
 config AGP
         tristate "/dev/agpgart (AGP Support)"
-        depends on ALPHA || IA64 || PPC || X86
+        depends on ALPHA || IA64 || PARISC || PPC || X86
         depends on PCI
         ---help---
           AGP (Accelerated Graphics Port) is a bus system mainly used to
@@ -122,6 +122,14 @@ config AGP_HP_ZX1
           This option gives you AGP GART support for the HP ZX1 chipset
           for IA64 processors.
 
+config AGP_PARISC
+        tristate "HP Quicksilver AGP support"
+        depends on AGP && PARISC && 64BIT
+        help
+          This option gives you AGP GART support for the HP Quicksilver
+          AGP bus adapter on HP PA-RISC machines (Ok, just on the C8000
+          workstation...)
+
 config AGP_ALPHA_CORE
         tristate "Alpha AGP support"
         depends on AGP && (ALPHA_GENERIC || ALPHA_TITAN || ALPHA_MARVEL)
diff --git a/drivers/char/agp/Makefile b/drivers/char/agp/Makefile
index d33a22f2fa0b..3e581603d0a8 100644
--- a/drivers/char/agp/Makefile
+++ b/drivers/char/agp/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_AGP_AMD64)		+= amd64-agp.o
 obj-$(CONFIG_AGP_ALPHA_CORE)    += alpha-agp.o
 obj-$(CONFIG_AGP_EFFICEON)      += efficeon-agp.o
 obj-$(CONFIG_AGP_HP_ZX1)        += hp-agp.o
+obj-$(CONFIG_AGP_PARISC)        += parisc-agp.o
 obj-$(CONFIG_AGP_I460)          += i460-agp.o
 obj-$(CONFIG_AGP_INTEL)         += intel-agp.o
 obj-$(CONFIG_AGP_NVIDIA)        += nvidia-agp.o
diff --git a/drivers/char/agp/parisc-agp.c b/drivers/char/agp/parisc-agp.c
new file mode 100644
index 000000000000..17c50b0f83f0
--- /dev/null
+++ b/drivers/char/agp/parisc-agp.c
@@ -0,0 +1,416 @@
+/*
+ * HP Quicksilver AGP GART routines
+ *
+ * Copyright (c) 2006, Kyle McMartin <kyle@parisc-linux.org>
+ *
+ * Based on drivers/char/agpgart/hp-agp.c which is
+ * (c) Copyright 2002, 2003 Hewlett-Packard Development Company, L.P.
+ *      Bjorn Helgaas <bjorn.helgaas@hp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/klist.h>
+#include <linux/agp_backend.h>
+
+#include <asm-parisc/parisc-device.h>
+#include <asm-parisc/ropes.h>
+
+#include "agp.h"
+
+#define DRVNAME "quicksilver"
+#define DRVPFX  DRVNAME ": "
+
+#ifndef log2
+#define log2(x)         ffz(~(x))
+#endif
+
+#define AGP8X_MODE_BIT          3
+#define AGP8X_MODE              (1 << AGP8X_MODE_BIT)
+
+static struct _parisc_agp_info {
+        void __iomem *ioc_regs;
+        void __iomem *lba_regs;
+
+        int lba_cap_offset;
+
+        u64 *gatt;
+        u64 gatt_entries;
+
+        u64 gart_base;
+        u64 gart_size;
+
+        int io_page_size;
+        int io_pages_per_kpage;
+} parisc_agp_info;
+
+static struct gatt_mask parisc_agp_masks[] =
+{
+        {
+                .mask = SBA_PDIR_VALID_BIT,
+                .type = 0
+        }
+};
+
+static struct aper_size_info_fixed parisc_agp_sizes[] =
+{
+        {0, 0, 0},              /* filled in by parisc_agp_fetch_size() */
+};
+
+static int
+parisc_agp_fetch_size(void)
+{
+        int size;
+
+        size = parisc_agp_info.gart_size / MB(1);
+        parisc_agp_sizes[0].size = size;
+        agp_bridge->current_size = (void *) &parisc_agp_sizes[0];
+
+        return size;
+}
+
+static int
+parisc_agp_configure(void)
+{
+        struct _parisc_agp_info *info = &parisc_agp_info;
+
+        agp_bridge->gart_bus_addr = info->gart_base;
+        agp_bridge->capndx = info->lba_cap_offset;
+        agp_bridge->mode = readl(info->lba_regs+info->lba_cap_offset+PCI_AGP_STATUS);
+
+        return 0;
+}
+
+static void
+parisc_agp_tlbflush(struct agp_memory *mem)
+{
+        struct _parisc_agp_info *info = &parisc_agp_info;
+
+        writeq(info->gart_base | log2(info->gart_size), info->ioc_regs+IOC_PCOM);
+        readq(info->ioc_regs+IOC_PCOM); /* flush */
+}
+
+static int
+parisc_agp_create_gatt_table(struct agp_bridge_data *bridge)
+{
+        struct _parisc_agp_info *info = &parisc_agp_info;
+        int i;
+
+        for (i = 0; i < info->gatt_entries; i++) {
+                info->gatt[i] = (unsigned long)agp_bridge->scratch_page;
+        }
+
+        return 0;
+}
+
+static int
+parisc_agp_free_gatt_table(struct agp_bridge_data *bridge)
+{
+        struct _parisc_agp_info *info = &parisc_agp_info;
+
+        info->gatt[0] = SBA_AGPGART_COOKIE;
+
+        return 0;
+}
+
+static int
+parisc_agp_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
+{
+        struct _parisc_agp_info *info = &parisc_agp_info;
+        int i, k;
+        off_t j, io_pg_start;
+        int io_pg_count;
+
+        if (type != 0 || mem->type != 0) {
+                return -EINVAL;
+        }
+
+        io_pg_start = info->io_pages_per_kpage * pg_start;
+        io_pg_count = info->io_pages_per_kpage * mem->page_count;
+        if ((io_pg_start + io_pg_count) > info->gatt_entries) {
+                return -EINVAL;
+        }
+
+        j = io_pg_start;
+        while (j < (io_pg_start + io_pg_count)) {
+                if (info->gatt[j])
+                        return -EBUSY;
+                j++;
+        }
+
+        if (mem->is_flushed == FALSE) {
+                global_cache_flush();
+                mem->is_flushed = TRUE;
+        }
+
+        for (i = 0, j = io_pg_start; i < mem->page_count; i++) {
+                unsigned long paddr;
+
+                paddr = mem->memory[i];
+                for (k = 0;
+                     k < info->io_pages_per_kpage;
+                     k++, j++, paddr += info->io_page_size) {
+                        info->gatt[j] =
+                                agp_bridge->driver->mask_memory(agp_bridge,
+                                        paddr, type);
+                }
+        }
+
+        agp_bridge->driver->tlb_flush(mem);
+
+        return 0;
+}
+
+static int
+parisc_agp_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
+{
+        struct _parisc_agp_info *info = &parisc_agp_info;
+        int i, io_pg_start, io_pg_count;
+
+        if (type != 0 || mem->type != 0) {
+                return -EINVAL;
+        }
+
+        io_pg_start = info->io_pages_per_kpage * pg_start;
+        io_pg_count = info->io_pages_per_kpage * mem->page_count;
+        for (i = io_pg_start; i < io_pg_count + io_pg_start; i++) {
+                info->gatt[i] = agp_bridge->scratch_page;
+        }
+
+        agp_bridge->driver->tlb_flush(mem);
+        return 0;
+}
+
+static unsigned long
+parisc_agp_mask_memory(struct agp_bridge_data *bridge,
+                    unsigned long addr, int type)
+{
+        return SBA_PDIR_VALID_BIT | addr;
+}
+
+static void
+parisc_agp_enable(struct agp_bridge_data *bridge, u32 mode)
+{
+        struct _parisc_agp_info *info = &parisc_agp_info;
+        u32 command;
+
+        command = readl(info->lba_regs + info->lba_cap_offset + PCI_AGP_STATUS);
+
+        command = agp_collect_device_status(bridge, mode, command);
+        command |= 0x00000100;
+
+        writel(command, info->lba_regs + info->lba_cap_offset + PCI_AGP_COMMAND);
+
+        agp_device_command(command, (mode & AGP8X_MODE) != 0);
+}
+
+struct agp_bridge_driver parisc_agp_driver = {
+        .owner                  = THIS_MODULE,
+        .size_type              = FIXED_APER_SIZE,
+        .configure              = parisc_agp_configure,
+        .fetch_size             = parisc_agp_fetch_size,
+        .tlb_flush              = parisc_agp_tlbflush,
+        .mask_memory            = parisc_agp_mask_memory,
+        .masks                  = parisc_agp_masks,
+        .agp_enable             = parisc_agp_enable,
+        .cache_flush            = global_cache_flush,
+        .create_gatt_table      = parisc_agp_create_gatt_table,
+        .free_gatt_table        = parisc_agp_free_gatt_table,
+        .insert_memory          = parisc_agp_insert_memory,
+        .remove_memory          = parisc_agp_remove_memory,
+        .alloc_by_type          = agp_generic_alloc_by_type,
+        .free_by_type           = agp_generic_free_by_type,
+        .agp_alloc_page         = agp_generic_alloc_page,
+        .agp_destroy_page       = agp_generic_destroy_page,
+        .cant_use_aperture      = 1,
+};
+
+static int __init
+agp_ioc_init(void __iomem *ioc_regs)
+{
+        struct _parisc_agp_info *info = &parisc_agp_info;
+        u64 *iova_base, *io_pdir, io_tlb_ps;
+        int io_tlb_shift;
+
+        printk(KERN_INFO DRVPFX "IO PDIR shared with sba_iommu\n");
+
+        info->ioc_regs = ioc_regs;
+
+        io_tlb_ps = readq(info->ioc_regs+IOC_TCNFG);
+        switch (io_tlb_ps) {
+        case 0: io_tlb_shift = 12; break;
+        case 1: io_tlb_shift = 13; break;
+        case 2: io_tlb_shift = 14; break;
+        case 3: io_tlb_shift = 16; break;
+        default:
+                printk(KERN_ERR DRVPFX "Invalid IOTLB page size "
+                       "configuration 0x%llx\n", io_tlb_ps);
+                info->gatt = NULL;
+                info->gatt_entries = 0;
+                return -ENODEV;
+        }
+        info->io_page_size = 1 << io_tlb_shift;
+        info->io_pages_per_kpage = PAGE_SIZE / info->io_page_size;
+
+        iova_base = readq(info->ioc_regs+IOC_IBASE) & ~0x1;
+        info->gart_base = iova_base + PLUTO_IOVA_SIZE - PLUTO_GART_SIZE;
+
+        info->gart_size = PLUTO_GART_SIZE;
+        info->gatt_entries = info->gart_size / info->io_page_size;
+
+        io_pdir = phys_to_virt(readq(info->ioc_regs+IOC_PDIR_BASE));
+        info->gatt = &io_pdir[(PLUTO_IOVA_SIZE/2) >> PAGE_SHIFT];
+
+        if (info->gatt[0] != SBA_AGPGART_COOKIE) {
+                info->gatt = NULL;
+                info->gatt_entries = 0;
+                printk(KERN_ERR DRVPFX "No reserved IO PDIR entry found; "
+                       "GART disabled\n");
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+static int
+lba_find_capability(int cap)
+{
+        struct _parisc_agp_info *info = &parisc_agp_info;
+        u16 status;
+        u8 pos, id;
+        int ttl = 48;
+
+        status = readw(info->lba_regs + PCI_STATUS);
+        if (!(status & PCI_STATUS_CAP_LIST))
+                return 0;
+        pos = readb(info->lba_regs + PCI_CAPABILITY_LIST);
+        while (ttl-- && pos >= 0x40) {
+                pos &= ~3;
+                id = readb(info->lba_regs + pos + PCI_CAP_LIST_ID);
+                if (id == 0xff)
+                        break;
+                if (id == cap)
+                        return pos;
+                pos = readb(info->lba_regs + pos + PCI_CAP_LIST_NEXT);
+        }
+        return 0;
+}
+
+static int __init
+agp_lba_init(void __iomem *lba_hpa)
+{
+        struct _parisc_agp_info *info = &parisc_agp_info;
+        int cap;
+
+        info->lba_regs = lba_hpa;
+        info->lba_cap_offset = lba_find_capability(PCI_CAP_ID_AGP);
+
+        cap = readl(lba_hpa + info->lba_cap_offset) & 0xff;
+        if (cap != PCI_CAP_ID_AGP) {
+                printk(KERN_ERR DRVPFX "Invalid capability ID 0x%02x at 0x%x\n",
+                       cap, info->lba_cap_offset);
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+static int __init
+parisc_agp_setup(void __iomem *ioc_hpa, void __iomem *lba_hpa)
+{
+        struct pci_dev *fake_bridge_dev = NULL;
+        struct agp_bridge_data *bridge;
+        int error = 0;
+
+        fake_bridge_dev = kmalloc(sizeof (struct pci_dev), GFP_KERNEL);
+        if (!fake_bridge_dev) {
+                error = -ENOMEM;
+                goto fail;
+        }
+
+        error = agp_ioc_init(ioc_hpa);
+        if (error)
+                goto fail;
+
+        error = agp_lba_init(lba_hpa);
+        if (error)
+                goto fail;
+
+        bridge = agp_alloc_bridge();
+        if (!bridge) {
+                error = -ENOMEM;
+                goto fail;
+        }
+        bridge->driver = &parisc_agp_driver;
+
+        fake_bridge_dev->vendor = PCI_VENDOR_ID_HP;
+        fake_bridge_dev->device = PCI_DEVICE_ID_HP_PCIX_LBA;
+        bridge->dev = fake_bridge_dev;
+
+        error = agp_add_bridge(bridge);
+
+fail:
+        return error;
+}
+
+static struct device *next_device(struct klist_iter *i) {
+        struct klist_node * n = klist_next(i);
+        return n ? container_of(n, struct device, knode_parent) : NULL;
+}
+
+static int
+parisc_agp_init(void)
+{
+        extern struct sba_device *sba_list;
+
+        int err = -1;
+        struct parisc_device *sba = NULL, *lba = NULL;
+        struct lba_device *lbadev = NULL;
+        struct device *dev = NULL;
+        struct klist_iter i;
+
+        if (!sba_list)
+                goto out;
+
+        /* Find our parent Pluto */
+        sba = sba_list->dev;
+        if (!IS_PLUTO(sba)) {
+                printk(KERN_INFO DRVPFX "No Pluto found, so no AGPGART for you.\n");
+                goto out;
+        }
+
+        /* Now search our Pluto for our precious AGP device... */
+        klist_iter_init(&sba->dev.klist_children, &i);
+        while ((dev = next_device(&i))) {
+                struct parisc_device *padev = to_parisc_device(dev);
+                if (IS_QUICKSILVER(padev))
+                        lba = padev;
+        }
+        klist_iter_exit(&i);
+
+        if (!lba) {
+                printk(KERN_INFO DRVPFX "No AGP devices found.\n");
+                goto out;
+        }
+
+        lbadev = parisc_get_drvdata(lba);
+
+        /* w00t, let's go find our cookies... */
+        parisc_agp_setup(sba_list->ioc[0].ioc_hpa, lbadev->hba.base_addr);
+
+        return 0;
+
+out:
+        return err;
+}
+
+module_init(parisc_agp_init);
+
+MODULE_AUTHOR("Kyle McMartin <kyle@parisc-linux.org>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c
index eed99bdcfb6b..294c1117098d 100644
--- a/drivers/parisc/sba_iommu.c
+++ b/drivers/parisc/sba_iommu.c
@@ -89,7 +89,8 @@
 
 #define DEFAULT_DMA_HINT_REG    0
 
-static struct sba_device *sba_list;
+struct sba_device *sba_list;
+EXPORT_SYMBOL_GPL(sba_list);
 
 static unsigned long ioc_needs_fdc = 0;
 
@@ -102,8 +103,14 @@ static unsigned long piranha_bad_128k = 0;
 /* Looks nice and keeps the compiler happy */
 #define SBA_DEV(d) ((struct sba_device *) (d))
 
+#ifdef CONFIG_AGP_PARISC
+#define SBA_AGP_SUPPORT
+#endif /*CONFIG_AGP_PARISC*/
+
 #ifdef SBA_AGP_SUPPORT
-static int reserve_sba_gart = 1;
+static int sba_reserve_agpgart = 1;
+module_param(sba_reserve_agpgart, int, 1);
+MODULE_PARM_DESC(sba_reserve_agpgart, "Reserve half of IO pdir as AGPGART");
 #endif
 
 #define ROUNDUP(x,y) ((x + ((y)-1)) & ~((y)-1))
@@ -1300,6 +1307,10 @@ sba_ioc_init_pluto(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
         WRITE_REG(ioc->ibase | 31, ioc->ioc_hpa + IOC_PCOM);
 
 #ifdef SBA_AGP_SUPPORT
+{
+        struct klist_iter i;
+        struct device *dev = NULL;
+
         /*
         ** If an AGP device is present, only use half of the IOV space
         ** for PCI DMA.  Unfortunately we can't know ahead of time
@@ -1308,20 +1319,22 @@ sba_ioc_init_pluto(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
         ** We program the next pdir index after we stop w/ a key for
         ** the GART code to handshake on.
         */
-        device=NULL;
-        for (lba = sba->child; lba; lba = lba->sibling) {
+        klist_iter_init(&sba->dev.klist_children, &i);
+        while (dev = next_device(&i)) {
+                struct parisc_device *lba = to_parisc_device(dev);
                 if (IS_QUICKSILVER(lba))
-                        break;
+                        agp_found = 1;
         }
+        klist_iter_exit(&sba->dev.klist_children, &i);
 
-        if (lba) {
-                DBG_INIT("%s: Reserving half of IOVA space for AGP GART support\n", __FUNCTION__);
+        if (agp_found && sba_reserve_agpgart) {
+                printk(KERN_INFO "%s: reserving %dMb of IOVA space for agpgart\n",
+                       __FUNCTION__, (iova_space_size/2) >> 20);
                 ioc->pdir_size /= 2;
-                ((u64 *)ioc->pdir_base)[PDIR_INDEX(iova_space_size/2)] = SBA_IOMMU_COOKIE;
-        } else {
-                DBG_INIT("%s: No GART needed - no AGP controller found\n", __FUNCTION__);
+                ioc->pdir_base[PDIR_INDEX(iova_space_size/2)] = SBA_AGPGART_COOKIE;
         }
-#endif /* 0 */
+}
+#endif /*SBA_AGP_SUPPORT*/
 
 }