--- /dev/null
+/*
+ * 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"
+
+
+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, ®);
+ if (err != CS_SUCCESS)
+ goto error;
+ reg.Offset = 0x30;
+ reg.Value = (addr & 0x00FF0000) >> 16;
+ err = pcmcia_access_configuration_register(pdev, ®);
+ if (err != CS_SUCCESS)
+ goto error;
+ reg.Offset = 0x32;
+ reg.Value = (addr & 0xFF000000) >> 24;
+ err = pcmcia_access_configuration_register(pdev, ®);
+ if (err != CS_SUCCESS)
+ goto error;
+
+ read_addr = 0;
+
+ reg.Action = CS_READ;
+ reg.Offset = 0x2E;
+ err = pcmcia_access_configuration_register(pdev, ®);
+ if (err != CS_SUCCESS)
+ goto error;
+ read_addr |= (reg.Value & 0xF) << 12;
+ reg.Offset = 0x30;
+ err = pcmcia_access_configuration_register(pdev, ®);
+ if (err != CS_SUCCESS)
+ goto error;
+ read_addr |= reg.Value << 16;
+ reg.Offset = 0x32;
+ err = pcmcia_access_configuration_register(pdev, ®);
+ 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;
+
+ ssb_dprintk(KERN_INFO PFX
+ "Switching to %s core, index %d\n",
+ ssb_core_name(dev->id.coreid),
+ dev->core_index);
+
+ 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;
+
+ assert(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, ®);
+ if (unlikely(res != CS_SUCCESS))
+ goto error;
+ reg.Value = 0xFF;
+ reg.Action = CS_READ;
+ res = pcmcia_access_configuration_register(bus->host_pcmcia, ®);
+ 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;
+}
+
+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);
+//printk("R16 0x%04X, 0x%04X\n", offset, x);
+ 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);
+//printk("R32 0x%04X, 0x%08X\n", offset, x);
+ 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;
+//printk("W16 0x%04X, 0x%04X\n", offset, value);
+ 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;
+//printk("W32 0x%04X, 0x%08X\n", offset, value);
+ readw(bus->mmio + offset);
+ writew(value >> 16, bus->mmio + offset + 2);
+ readw(bus->mmio + offset);
+ writew(value, bus->mmio + offset);
+}
+
+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, ®);
+ if (err != CS_SUCCESS)
+ goto error;
+ reg.Action = CS_WRITE;
+ reg.Value |= 0x04 | 0x01;
+ err = pcmcia_access_configuration_register(bus->host_pcmcia, ®);
+ if (err != CS_SUCCESS)
+ goto error;
+
+ return 0;
+error:
+ return -ENODEV;
+}
projects / openwrt / svn-archive / archive.git / blobdiff