4 files changed, 206 insertions, 5 deletions

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 230601e8853f..b6e53c277276 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -546,15 +546,18 @@ config I2C_PUV3
 
 config I2C_PXA
         tristate "Intel PXA2XX I2C adapter"
-        depends on ARCH_PXA || ARCH_MMP
+        depends on ARCH_PXA || ARCH_MMP || (X86_32 && PCI && OF)
         help
           If you have devices in the PXA I2C bus, say yes to this option.
           This driver can also be built as a module.  If so, the module
           will be called i2c-pxa.
 
+config I2C_PXA_PCI
+        def_bool I2C_PXA && X86_32 && PCI && OF
+
 config I2C_PXA_SLAVE
         bool "Intel PXA2XX I2C Slave comms support"
-        depends on I2C_PXA
+        depends on I2C_PXA && !X86_32
         help
           Support I2C slave mode communications on the PXA I2C bus.  This
           is necessary for systems where the PXA may be a target on the
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 3878c959d4fa..1dd554e51440 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -54,6 +54,7 @@ obj-$(CONFIG_I2C_PMCMSP)	+= i2c-pmcmsp.o
 obj-$(CONFIG_I2C_PNX)           += i2c-pnx.o
 obj-$(CONFIG_I2C_PUV3)          += i2c-puv3.o
 obj-$(CONFIG_I2C_PXA)           += i2c-pxa.o
+obj-$(CONFIG_I2C_PXA_PCI)       += i2c-pxa-pci.o
 obj-$(CONFIG_I2C_S3C2410)       += i2c-s3c2410.o
 obj-$(CONFIG_I2C_S6000)         += i2c-s6000.o
 obj-$(CONFIG_I2C_SH7760)        += i2c-sh7760.o
diff --git a/drivers/i2c/busses/i2c-pxa-pci.c b/drivers/i2c/busses/i2c-pxa-pci.c
new file mode 100644
index 000000000000..6659d269b841
--- /dev/null
+++ b/drivers/i2c/busses/i2c-pxa-pci.c
@@ -0,0 +1,176 @@
+/*
+ * The CE4100's I2C device is more or less the same one as found on PXA.
+ * It does not support slave mode, the register slightly moved. This PCI
+ * device provides three bars, every contains a single I2C controller.
+ */
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/i2c/pxa-i2c.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+
+#define CE4100_PCI_I2C_DEVS     3
+
+struct ce4100_devices {
+        struct platform_device *pdev[CE4100_PCI_I2C_DEVS];
+};
+
+static struct platform_device *add_i2c_device(struct pci_dev *dev, int bar)
+{
+        struct platform_device *pdev;
+        struct i2c_pxa_platform_data pdata;
+        struct resource res[2];
+        struct device_node *child;
+        static int devnum;
+        int ret;
+
+        memset(&pdata, 0, sizeof(struct i2c_pxa_platform_data));
+        memset(&res, 0, sizeof(res));
+
+        res[0].flags = IORESOURCE_MEM;
+        res[0].start = pci_resource_start(dev, bar);
+        res[0].end = pci_resource_end(dev, bar);
+
+        res[1].flags = IORESOURCE_IRQ;
+        res[1].start = dev->irq;
+        res[1].end = dev->irq;
+
+        for_each_child_of_node(dev->dev.of_node, child) {
+                const void *prop;
+                struct resource r;
+                int ret;
+
+                ret = of_address_to_resource(child, 0, &r);
+                if (ret < 0)
+                        continue;
+                if (r.start != res[0].start)
+                        continue;
+                if (r.end != res[0].end)
+                        continue;
+                if (r.flags != res[0].flags)
+                        continue;
+
+                prop = of_get_property(child, "fast-mode", NULL);
+                if (prop)
+                        pdata.fast_mode = 1;
+
+                break;
+        }
+
+        if (!child) {
+                dev_err(&dev->dev, "failed to match a DT node for bar %d.\n",
+                                bar);
+                ret = -EINVAL;
+                goto out;
+        }
+
+        pdev = platform_device_alloc("ce4100-i2c", devnum);
+        if (!pdev) {
+                of_node_put(child);
+                ret = -ENOMEM;
+                goto out;
+        }
+        pdev->dev.parent = &dev->dev;
+        pdev->dev.of_node = child;
+
+        ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res));
+        if (ret)
+                goto err;
+
+        ret = platform_device_add_data(pdev, &pdata, sizeof(pdata));
+        if (ret)
+                goto err;
+
+        ret = platform_device_add(pdev);
+        if (ret)
+                goto err;
+        devnum++;
+        return pdev;
+err:
+        platform_device_put(pdev);
+out:
+        return ERR_PTR(ret);
+}
+
+static int __devinit ce4100_i2c_probe(struct pci_dev *dev,
+                const struct pci_device_id *ent)
+{
+        int ret;
+        int i;
+        struct ce4100_devices *sds;
+
+        ret = pci_enable_device_mem(dev);
+        if (ret)
+                return ret;
+
+        if (!dev->dev.of_node) {
+                dev_err(&dev->dev, "Missing device tree node.\n");
+                return -EINVAL;
+        }
+        sds = kzalloc(sizeof(*sds), GFP_KERNEL);
+        if (!sds)
+                goto err_mem;
+
+        for (i = 0; i < ARRAY_SIZE(sds->pdev); i++) {
+                sds->pdev[i] = add_i2c_device(dev, i);
+                if (IS_ERR(sds->pdev[i])) {
+                        while (--i >= 0)
+                                platform_device_unregister(sds->pdev[i]);
+                        goto err_dev_add;
+                }
+        }
+        pci_set_drvdata(dev, sds);
+        return 0;
+
+err_dev_add:
+        pci_set_drvdata(dev, NULL);
+        kfree(sds);
+err_mem:
+        pci_disable_device(dev);
+        return ret;
+}
+
+static void __devexit ce4100_i2c_remove(struct pci_dev *dev)
+{
+        struct ce4100_devices *sds;
+        unsigned int i;
+
+        sds = pci_get_drvdata(dev);
+        pci_set_drvdata(dev, NULL);
+
+        for (i = 0; i < ARRAY_SIZE(sds->pdev); i++)
+                platform_device_unregister(sds->pdev[i]);
+
+        pci_disable_device(dev);
+        kfree(sds);
+}
+
+static struct pci_device_id ce4100_i2c_devices[] __devinitdata = {
+        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e68)},
+        { },
+};
+MODULE_DEVICE_TABLE(pci, ce4100_i2c_devices);
+
+static struct pci_driver ce4100_i2c_driver = {
+        .name           = "ce4100_i2c",
+        .id_table       = ce4100_i2c_devices,
+        .probe          = ce4100_i2c_probe,
+        .remove         = __devexit_p(ce4100_i2c_remove),
+};
+
+static int __init ce4100_i2c_init(void)
+{
+        return pci_register_driver(&ce4100_i2c_driver);
+}
+module_init(ce4100_i2c_init);
+
+static void __exit ce4100_i2c_exit(void)
+{
+        pci_unregister_driver(&ce4100_i2c_driver);
+}
+module_exit(ce4100_i2c_exit);
+
+MODULE_DESCRIPTION("CE4100 PCI-I2C glue code for PXA's driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index fc2a90ed14cc..ab59b7e492ed 100644
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -38,6 +38,13 @@
 
 #include <asm/irq.h>
 
+#ifndef CONFIG_HAVE_CLK
+#define clk_get(dev, id)        NULL
+#define clk_put(clk)            do { } while (0)
+#define clk_disable(clk)        do { } while (0)
+#define clk_enable(clk)         do { } while (0)
+#endif
+
 struct pxa_reg_layout {
         u32 ibmr;
         u32 idbr;
@@ -49,6 +56,7 @@ struct pxa_reg_layout {
 enum pxa_i2c_types {
         REGS_PXA2XX,
         REGS_PXA3XX,
+        REGS_CE4100,
 };
 
 /*
@@ -69,11 +77,19 @@ static struct pxa_reg_layout pxa_reg_layout[] = {
                 .isr =  0x18,
                 .isar = 0x20,
         },
+        [REGS_CE4100] = {
+                .ibmr = 0x14,
+                .idbr = 0x0c,
+                .icr =  0x00,
+                .isr =  0x04,
+                /* no isar register */
+        },
 };
 
 static const struct platform_device_id i2c_pxa_id_table[] = {
         { "pxa2xx-i2c",         REGS_PXA2XX },
         { "pxa3xx-pwri2c",      REGS_PXA3XX },
+        { "ce4100-i2c",         REGS_CE4100 },
         { },
 };
 MODULE_DEVICE_TABLE(platform, i2c_pxa_id_table);
@@ -442,7 +458,8 @@ static void i2c_pxa_reset(struct pxa_i2c *i2c)
         writel(I2C_ISR_INIT, _ISR(i2c));
         writel(readl(_ICR(i2c)) & ~ICR_UR, _ICR(i2c));
 
-        writel(i2c->slave_addr, _ISAR(i2c));
+        if (i2c->reg_isar)
+                writel(i2c->slave_addr, _ISAR(i2c));
 
         /* set control register values */
         writel(I2C_ICR_INIT | (i2c->fast_mode ? ICR_FM : 0), _ICR(i2c));
@@ -1074,7 +1091,8 @@ static int i2c_pxa_probe(struct platform_device *dev)
         i2c->reg_idbr = i2c->reg_base + pxa_reg_layout[i2c_type].idbr;
         i2c->reg_icr = i2c->reg_base + pxa_reg_layout[i2c_type].icr;
         i2c->reg_isr = i2c->reg_base + pxa_reg_layout[i2c_type].isr;
-        i2c->reg_isar = i2c->reg_base + pxa_reg_layout[i2c_type].isar;
+        if (i2c_type != REGS_CE4100)
+                i2c->reg_isar = i2c->reg_base + pxa_reg_layout[i2c_type].isar;
 
         i2c->iobase = res->start;
         i2c->iosize = resource_size(res);
@@ -1113,7 +1131,10 @@ static int i2c_pxa_probe(struct platform_device *dev)
         i2c->adap.algo_data = i2c;
         i2c->adap.dev.parent = &dev->dev;
 
-        ret = i2c_add_numbered_adapter(&i2c->adap);
+        if (i2c_type == REGS_CE4100)
+                ret = i2c_add_adapter(&i2c->adap);
+        else
+                ret = i2c_add_numbered_adapter(&i2c->adap);
         if (ret < 0) {
                 printk(KERN_INFO "I2C: Failed to add bus\n");
                 goto eadapt;