1 files changed, 271 insertions, 0 deletions

diff --git a/drivers/ssb/pcmcia.c b/drivers/ssb/pcmcia.c
new file mode 100644
index 00000000000..7c773603b40
--- /dev/null
+++ b/drivers/ssb/pcmcia.c
@@ -0,0 +1,271 @@
+/*
+ * Sonics Silicon Backplane
+ * PCMCIA-Hostbus related functions
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2007 Michael Buesch <mb@bu3sch.de>
+ *
+ * Licensed under the GNU/GPL. See COPYING for details.
+ */
+
+#include <linux/ssb/ssb.h>
+#include <linux/delay.h>
+
+#include <pcmcia/cs_types.h>
+#include <pcmcia/cs.h>
+#include <pcmcia/cistpl.h>
+#include <pcmcia/ciscode.h>
+#include <pcmcia/ds.h>
+#include <pcmcia/cisreg.h>
+
+#include "ssb_private.h"
+
+
+/* Define the following to 1 to enable a printk on each coreswitch. */
+#define SSB_VERBOSE_PCMCIACORESWITCH_DEBUG              0
+
+
+int ssb_pcmcia_switch_coreidx(struct ssb_bus *bus,
+                              u8 coreidx)
+{
+        struct pcmcia_device *pdev = bus->host_pcmcia;
+        int err;
+        int attempts = 0;
+        u32 cur_core;
+        conf_reg_t reg;
+        u32 addr;
+        u32 read_addr;
+
+        addr = (coreidx * SSB_CORE_SIZE) + SSB_ENUM_BASE;
+        while (1) {
+                reg.Action = CS_WRITE;
+                reg.Offset = 0x2E;
+                reg.Value = (addr & 0x0000F000) >> 12;
+                err = pcmcia_access_configuration_register(pdev, &reg);
+                if (err != CS_SUCCESS)
+                        goto error;
+                reg.Offset = 0x30;
+                reg.Value = (addr & 0x00FF0000) >> 16;
+                err = pcmcia_access_configuration_register(pdev, &reg);
+                if (err != CS_SUCCESS)
+                        goto error;
+                reg.Offset = 0x32;
+                reg.Value = (addr & 0xFF000000) >> 24;
+                err = pcmcia_access_configuration_register(pdev, &reg);
+                if (err != CS_SUCCESS)
+                        goto error;
+
+                read_addr = 0;
+
+                reg.Action = CS_READ;
+                reg.Offset = 0x2E;
+                err = pcmcia_access_configuration_register(pdev, &reg);
+                if (err != CS_SUCCESS)
+                        goto error;
+                read_addr |= (reg.Value & 0xF) << 12;
+                reg.Offset = 0x30;
+                err = pcmcia_access_configuration_register(pdev, &reg);
+                if (err != CS_SUCCESS)
+                        goto error;
+                read_addr |= reg.Value << 16;
+                reg.Offset = 0x32;
+                err = pcmcia_access_configuration_register(pdev, &reg);
+                if (err != CS_SUCCESS)
+                        goto error;
+                read_addr |= reg.Value << 24;
+
+                cur_core = (read_addr - SSB_ENUM_BASE) / SSB_CORE_SIZE;
+                if (cur_core == coreidx)
+                        break;
+
+                if (attempts++ > SSB_BAR0_MAX_RETRIES)
+                        goto error;
+                udelay(10);
+        }
+
+        return 0;
+error:
+        ssb_printk(KERN_ERR PFX "Failed to switch to core %u\n", coreidx);
+        return -ENODEV;
+}
+
+int ssb_pcmcia_switch_core(struct ssb_bus *bus,
+                           struct ssb_device *dev)
+{
+        int err;
+        unsigned long flags;
+
+#if SSB_VERBOSE_PCMCIACORESWITCH_DEBUG
+        ssb_printk(KERN_INFO PFX
+                   "Switching to %s core, index %d\n",
+                   ssb_core_name(dev->id.coreid),
+                   dev->core_index);
+#endif
+
+        spin_lock_irqsave(&bus->bar_lock, flags);
+        err = ssb_pcmcia_switch_coreidx(bus, dev->core_index);
+        if (!err)
+                bus->mapped_device = dev;
+        spin_unlock_irqrestore(&bus->bar_lock, flags);
+
+        return err;
+}
+
+int ssb_pcmcia_switch_segment(struct ssb_bus *bus, u8 seg)
+{
+        int attempts = 0;
+        unsigned long flags;
+        conf_reg_t reg;
+        int res, err = 0;
+
+        SSB_WARN_ON((seg != 0) && (seg != 1));
+        reg.Offset = 0x34;
+        reg.Function = 0;
+        spin_lock_irqsave(&bus->bar_lock, flags);
+        while (1) {
+                reg.Action = CS_WRITE;
+                reg.Value = seg;
+                res = pcmcia_access_configuration_register(bus->host_pcmcia, &reg);
+                if (unlikely(res != CS_SUCCESS))
+                        goto error;
+                reg.Value = 0xFF;
+                reg.Action = CS_READ;
+                res = pcmcia_access_configuration_register(bus->host_pcmcia, &reg);
+                if (unlikely(res != CS_SUCCESS))
+                        goto error;
+
+                if (reg.Value == seg)
+                        break;
+
+                if (unlikely(attempts++ > SSB_BAR0_MAX_RETRIES))
+                        goto error;
+                udelay(10);
+        }
+        bus->mapped_pcmcia_seg = seg;
+out_unlock:
+        spin_unlock_irqrestore(&bus->bar_lock, flags);
+        return err;
+error:
+        ssb_printk(KERN_ERR PFX "Failed to switch pcmcia segment\n");
+        err = -ENODEV;
+        goto out_unlock;
+}
+
+/* These are the main device register access functions.
+ * do_select_core is inline to have the likely hotpath inline.
+ * All unlikely codepaths are out-of-line. */
+static inline int do_select_core(struct ssb_bus *bus,
+                                 struct ssb_device *dev,
+                                 u16 *offset)
+{
+        int err;
+        u8 need_seg = (*offset >= 0x800) ? 1 : 0;
+
+        if (unlikely(dev != bus->mapped_device)) {
+                err = ssb_pcmcia_switch_core(bus, dev);
+                if (unlikely(err))
+                        return err;
+        }
+        if (unlikely(need_seg != bus->mapped_pcmcia_seg)) {
+                err = ssb_pcmcia_switch_segment(bus, need_seg);
+                if (unlikely(err))
+                        return err;
+        }
+        if (need_seg == 1)
+                *offset -= 0x800;
+
+        return 0;
+}
+
+static u16 ssb_pcmcia_read16(struct ssb_device *dev, u16 offset)
+{
+        struct ssb_bus *bus = dev->bus;
+        u16 x;
+
+        if (unlikely(do_select_core(bus, dev, &offset)))
+                return 0xFFFF;
+        x = readw(bus->mmio + offset);
+
+        return x;
+}
+
+static u32 ssb_pcmcia_read32(struct ssb_device *dev, u16 offset)
+{
+        struct ssb_bus *bus = dev->bus;
+        u32 x;
+
+        if (unlikely(do_select_core(bus, dev, &offset)))
+                return 0xFFFFFFFF;
+        x = readl(bus->mmio + offset);
+
+        return x;
+}
+
+static void ssb_pcmcia_write16(struct ssb_device *dev, u16 offset, u16 value)
+{
+        struct ssb_bus *bus = dev->bus;
+
+        if (unlikely(do_select_core(bus, dev, &offset)))
+                return;
+        writew(value, bus->mmio + offset);
+}
+
+static void ssb_pcmcia_write32(struct ssb_device *dev, u16 offset, u32 value)
+{
+        struct ssb_bus *bus = dev->bus;
+
+        if (unlikely(do_select_core(bus, dev, &offset)))
+                return;
+        readw(bus->mmio + offset);
+        writew(value >> 16, bus->mmio + offset + 2);
+        readw(bus->mmio + offset);
+        writew(value, bus->mmio + offset);
+}
+
+/* Not "static", as it's used in main.c */
+const struct ssb_bus_ops ssb_pcmcia_ops = {
+        .read16         = ssb_pcmcia_read16,
+        .read32         = ssb_pcmcia_read32,
+        .write16        = ssb_pcmcia_write16,
+        .write32        = ssb_pcmcia_write32,
+};
+
+int ssb_pcmcia_get_invariants(struct ssb_bus *bus,
+                              struct ssb_init_invariants *iv)
+{
+        //TODO
+        return 0;
+}
+
+int ssb_pcmcia_init(struct ssb_bus *bus)
+{
+        conf_reg_t reg;
+        int err;
+
+        if (bus->bustype != SSB_BUSTYPE_PCMCIA)
+                return 0;
+
+        /* Switch segment to a known state and sync
+         * bus->mapped_pcmcia_seg with hardware state. */
+        ssb_pcmcia_switch_segment(bus, 0);
+
+        /* Init IRQ routing */
+        reg.Action = CS_READ;
+        reg.Function = 0;
+        if (bus->chip_id == 0x4306)
+                reg.Offset = 0x00;
+        else
+                reg.Offset = 0x80;
+        err = pcmcia_access_configuration_register(bus->host_pcmcia, &reg);
+        if (err != CS_SUCCESS)
+                goto error;
+        reg.Action = CS_WRITE;
+        reg.Value |= 0x04 | 0x01;
+        err = pcmcia_access_configuration_register(bus->host_pcmcia, &reg);
+        if (err != CS_SUCCESS)
+                goto error;
+
+        return 0;
+error:
+        return -ENODEV;
+}