drivers: Introduce MEN Chameleon Bus
The MCB (MEN Chameleon Bus) is a Bus specific to MEN Mikroelektronik
FPGA based devices. It is used to identify MCB based IP-Cores within
an FPGA and provide the necessary framework for instantiating drivers
for these devices.
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@men.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/mcb/mcb-parse.c b/drivers/mcb/mcb-parse.c
new file mode 100644
index 0000000..d1278b5
--- /dev/null
+++ b/drivers/mcb/mcb-parse.c
@@ -0,0 +1,159 @@
+#include <linux/types.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <linux/io.h>
+#include <linux/mcb.h>
+
+#include "mcb-internal.h"
+
+struct mcb_parse_priv {
+ phys_addr_t mapbase;
+ void __iomem *base;
+};
+
+#define for_each_chameleon_cell(dtype, p) \
+ for ((dtype) = get_next_dtype((p)); \
+ (dtype) != CHAMELEON_DTYPE_END; \
+ (dtype) = get_next_dtype((p)))
+
+static inline uint32_t get_next_dtype(void __iomem *p)
+{
+ uint32_t dtype;
+
+ dtype = readl(p);
+ return dtype >> 28;
+}
+
+static int chameleon_parse_bdd(struct mcb_bus *bus,
+ phys_addr_t mapbase,
+ void __iomem *base)
+{
+ return 0;
+}
+
+static int chameleon_parse_gdd(struct mcb_bus *bus,
+ phys_addr_t mapbase,
+ void __iomem *base)
+{
+ struct chameleon_gdd __iomem *gdd =
+ (struct chameleon_gdd __iomem *) base;
+ struct mcb_device *mdev;
+ u32 offset;
+ u32 size;
+ int ret;
+ __le32 reg1;
+ __le32 reg2;
+
+ mdev = mcb_alloc_dev(bus);
+ if (!mdev)
+ return -ENOMEM;
+
+ reg1 = readl(&gdd->reg1);
+ reg2 = readl(&gdd->reg2);
+ offset = readl(&gdd->offset);
+ size = readl(&gdd->size);
+
+ mdev->id = GDD_DEV(reg1);
+ mdev->rev = GDD_REV(reg1);
+ mdev->var = GDD_VAR(reg1);
+ mdev->bar = GDD_BAR(reg1);
+ mdev->group = GDD_GRP(reg2);
+ mdev->inst = GDD_INS(reg2);
+
+ pr_debug("Found a 16z%03d\n", mdev->id);
+
+ mdev->irq.start = GDD_IRQ(reg1);
+ mdev->irq.end = GDD_IRQ(reg1);
+ mdev->irq.flags = IORESOURCE_IRQ;
+
+ mdev->mem.start = mapbase + offset;
+ mdev->mem.end = mdev->mem.start + size - 1;
+ mdev->mem.flags = IORESOURCE_MEM;
+
+ mdev->is_added = false;
+
+ ret = mcb_device_register(bus, mdev);
+ if (ret < 0)
+ goto err;
+
+ return 0;
+
+err:
+ mcb_free_dev(mdev);
+
+ return ret;
+}
+
+int chameleon_parse_cells(struct mcb_bus *bus, phys_addr_t mapbase,
+ void __iomem *base)
+{
+ char __iomem *p = base;
+ struct chameleon_fpga_header *header;
+ uint32_t dtype;
+ int num_cells = 0;
+ int ret = 0;
+ u32 hsize;
+
+ hsize = sizeof(struct chameleon_fpga_header);
+
+ header = kzalloc(hsize, GFP_KERNEL);
+ if (!header)
+ return -ENOMEM;
+
+ /* Extract header information */
+ memcpy_fromio(header, p, hsize);
+ /* We only support chameleon v2 at the moment */
+ header->magic = le16_to_cpu(header->magic);
+ if (header->magic != CHAMELEONV2_MAGIC) {
+ pr_err("Unsupported chameleon version 0x%x\n",
+ header->magic);
+ kfree(header);
+ return -ENODEV;
+ }
+ p += hsize;
+
+ pr_debug("header->revision = %d\n", header->revision);
+ pr_debug("header->model = 0x%x ('%c')\n", header->model,
+ header->model);
+ pr_debug("header->minor = %d\n", header->minor);
+ pr_debug("header->bus_type = 0x%x\n", header->bus_type);
+
+
+ pr_debug("header->magic = 0x%x\n", header->magic);
+ pr_debug("header->filename = \"%.*s\"\n", CHAMELEON_FILENAME_LEN,
+ header->filename);
+
+ for_each_chameleon_cell(dtype, p) {
+ switch (dtype) {
+ case CHAMELEON_DTYPE_GENERAL:
+ ret = chameleon_parse_gdd(bus, mapbase, p);
+ if (ret < 0)
+ goto out;
+ p += sizeof(struct chameleon_gdd);
+ break;
+ case CHAMELEON_DTYPE_BRIDGE:
+ chameleon_parse_bdd(bus, mapbase, p);
+ p += sizeof(struct chameleon_bdd);
+ break;
+ case CHAMELEON_DTYPE_END:
+ break;
+ default:
+ pr_err("Invalid chameleon descriptor type 0x%x\n",
+ dtype);
+ return -EINVAL;
+ }
+ num_cells++;
+ }
+
+ if (num_cells == 0)
+ num_cells = -EINVAL;
+
+ kfree(header);
+ return num_cells;
+
+out:
+ kfree(header);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(chameleon_parse_cells);