1 files changed, 162 insertions, 0 deletions

diff --git a/drivers/bcma/sprom.c b/drivers/bcma/sprom.c
new file mode 100644
index 000000000000..ffbb0e32e921
--- /dev/null
+++ b/drivers/bcma/sprom.c
@@ -0,0 +1,162 @@
+/*
+ * Broadcom specific AMBA
+ * SPROM reading
+ *
+ * Licensed under the GNU/GPL. See COPYING for details.
+ */
+
+#include "bcma_private.h"
+
+#include <linux/bcma/bcma.h>
+#include <linux/bcma/bcma_regs.h>
+#include <linux/pci.h>
+#include <linux/io.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+
+#define SPOFF(offset)   ((offset) / sizeof(u16))
+
+/**************************************************
+ * R/W ops.
+ **************************************************/
+
+static void bcma_sprom_read(struct bcma_bus *bus, u16 *sprom)
+{
+        int i;
+        for (i = 0; i < SSB_SPROMSIZE_WORDS_R4; i++)
+                sprom[i] = bcma_read16(bus->drv_cc.core,
+                                       BCMA_CC_SPROM + (i * 2));
+}
+
+/**************************************************
+ * Validation.
+ **************************************************/
+
+static inline u8 bcma_crc8(u8 crc, u8 data)
+{
+        /* Polynomial:   x^8 + x^7 + x^6 + x^4 + x^2 + 1   */
+        static const u8 t[] = {
+                0x00, 0xF7, 0xB9, 0x4E, 0x25, 0xD2, 0x9C, 0x6B,
+                0x4A, 0xBD, 0xF3, 0x04, 0x6F, 0x98, 0xD6, 0x21,
+                0x94, 0x63, 0x2D, 0xDA, 0xB1, 0x46, 0x08, 0xFF,
+                0xDE, 0x29, 0x67, 0x90, 0xFB, 0x0C, 0x42, 0xB5,
+                0x7F, 0x88, 0xC6, 0x31, 0x5A, 0xAD, 0xE3, 0x14,
+                0x35, 0xC2, 0x8C, 0x7B, 0x10, 0xE7, 0xA9, 0x5E,
+                0xEB, 0x1C, 0x52, 0xA5, 0xCE, 0x39, 0x77, 0x80,
+                0xA1, 0x56, 0x18, 0xEF, 0x84, 0x73, 0x3D, 0xCA,
+                0xFE, 0x09, 0x47, 0xB0, 0xDB, 0x2C, 0x62, 0x95,
+                0xB4, 0x43, 0x0D, 0xFA, 0x91, 0x66, 0x28, 0xDF,
+                0x6A, 0x9D, 0xD3, 0x24, 0x4F, 0xB8, 0xF6, 0x01,
+                0x20, 0xD7, 0x99, 0x6E, 0x05, 0xF2, 0xBC, 0x4B,
+                0x81, 0x76, 0x38, 0xCF, 0xA4, 0x53, 0x1D, 0xEA,
+                0xCB, 0x3C, 0x72, 0x85, 0xEE, 0x19, 0x57, 0xA0,
+                0x15, 0xE2, 0xAC, 0x5B, 0x30, 0xC7, 0x89, 0x7E,
+                0x5F, 0xA8, 0xE6, 0x11, 0x7A, 0x8D, 0xC3, 0x34,
+                0xAB, 0x5C, 0x12, 0xE5, 0x8E, 0x79, 0x37, 0xC0,
+                0xE1, 0x16, 0x58, 0xAF, 0xC4, 0x33, 0x7D, 0x8A,
+                0x3F, 0xC8, 0x86, 0x71, 0x1A, 0xED, 0xA3, 0x54,
+                0x75, 0x82, 0xCC, 0x3B, 0x50, 0xA7, 0xE9, 0x1E,
+                0xD4, 0x23, 0x6D, 0x9A, 0xF1, 0x06, 0x48, 0xBF,
+                0x9E, 0x69, 0x27, 0xD0, 0xBB, 0x4C, 0x02, 0xF5,
+                0x40, 0xB7, 0xF9, 0x0E, 0x65, 0x92, 0xDC, 0x2B,
+                0x0A, 0xFD, 0xB3, 0x44, 0x2F, 0xD8, 0x96, 0x61,
+                0x55, 0xA2, 0xEC, 0x1B, 0x70, 0x87, 0xC9, 0x3E,
+                0x1F, 0xE8, 0xA6, 0x51, 0x3A, 0xCD, 0x83, 0x74,
+                0xC1, 0x36, 0x78, 0x8F, 0xE4, 0x13, 0x5D, 0xAA,
+                0x8B, 0x7C, 0x32, 0xC5, 0xAE, 0x59, 0x17, 0xE0,
+                0x2A, 0xDD, 0x93, 0x64, 0x0F, 0xF8, 0xB6, 0x41,
+                0x60, 0x97, 0xD9, 0x2E, 0x45, 0xB2, 0xFC, 0x0B,
+                0xBE, 0x49, 0x07, 0xF0, 0x9B, 0x6C, 0x22, 0xD5,
+                0xF4, 0x03, 0x4D, 0xBA, 0xD1, 0x26, 0x68, 0x9F,
+        };
+        return t[crc ^ data];
+}
+
+static u8 bcma_sprom_crc(const u16 *sprom)
+{
+        int word;
+        u8 crc = 0xFF;
+
+        for (word = 0; word < SSB_SPROMSIZE_WORDS_R4 - 1; word++) {
+                crc = bcma_crc8(crc, sprom[word] & 0x00FF);
+                crc = bcma_crc8(crc, (sprom[word] & 0xFF00) >> 8);
+        }
+        crc = bcma_crc8(crc, sprom[SSB_SPROMSIZE_WORDS_R4 - 1] & 0x00FF);
+        crc ^= 0xFF;
+
+        return crc;
+}
+
+static int bcma_sprom_check_crc(const u16 *sprom)
+{
+        u8 crc;
+        u8 expected_crc;
+        u16 tmp;
+
+        crc = bcma_sprom_crc(sprom);
+        tmp = sprom[SSB_SPROMSIZE_WORDS_R4 - 1] & SSB_SPROM_REVISION_CRC;
+        expected_crc = tmp >> SSB_SPROM_REVISION_CRC_SHIFT;
+        if (crc != expected_crc)
+                return -EPROTO;
+
+        return 0;
+}
+
+static int bcma_sprom_valid(const u16 *sprom)
+{
+        u16 revision;
+        int err;
+
+        err = bcma_sprom_check_crc(sprom);
+        if (err)
+                return err;
+
+        revision = sprom[SSB_SPROMSIZE_WORDS_R4 - 1] & SSB_SPROM_REVISION_REV;
+        if (revision != 8) {
+                pr_err("Unsupported SPROM revision: %d\n", revision);
+                return -ENOENT;
+        }
+
+        return 0;
+}
+
+/**************************************************
+ * SPROM extraction.
+ **************************************************/
+
+static void bcma_sprom_extract_r8(struct bcma_bus *bus, const u16 *sprom)
+{
+        u16 v;
+        int i;
+
+        for (i = 0; i < 3; i++) {
+                v = sprom[SPOFF(SSB_SPROM8_IL0MAC) + i];
+                *(((__be16 *)bus->sprom.il0mac) + i) = cpu_to_be16(v);
+        }
+}
+
+int bcma_sprom_get(struct bcma_bus *bus)
+{
+        u16 *sprom;
+        int err = 0;
+
+        if (!bus->drv_cc.core)
+                return -EOPNOTSUPP;
+
+        sprom = kcalloc(SSB_SPROMSIZE_WORDS_R4, sizeof(u16),
+                        GFP_KERNEL);
+        if (!sprom)
+                return -ENOMEM;
+
+        bcma_sprom_read(bus, sprom);
+
+        err = bcma_sprom_valid(sprom);
+        if (err)
+                goto out;
+
+        bcma_sprom_extract_r8(bus, sprom);
+
+out:
+        kfree(sprom);
+        return err;
+}