mtd: bcm47xxnflash: init NAND on BCM4706

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

2 files changed, 110 insertions, 0 deletions

diff --git a/drivers/mtd/nand/bcm47xxnflash/Makefile b/drivers/mtd/nand/bcm47xxnflash/Makefile
index 1d0693af6e98..4f688f9655ad 100644
--- a/drivers/mtd/nand/bcm47xxnflash/Makefile
+++ b/drivers/mtd/nand/bcm47xxnflash/Makefile
@@ -1,3 +1,4 @@
 bcm47xxnflash-y                         += main.o
+bcm47xxnflash-                          += ops_bcm4706.o
 
 obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH)    += bcm47xxnflash.o
diff --git a/drivers/mtd/nand/bcm47xxnflash/ops_bcm4706.c b/drivers/mtd/nand/bcm47xxnflash/ops_bcm4706.c
new file mode 100644
index 000000000000..ae8a79387c27
--- /dev/null
+++ b/drivers/mtd/nand/bcm47xxnflash/ops_bcm4706.c
@@ -0,0 +1,109 @@
+/*
+ * BCM47XX NAND flash driver
+ *
+ * Copyright (C) 2012 Rafał Miłecki <zajec5@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/bcma/bcma.h>
+
+#include "bcm47xxnflash.h"
+
+/**************************************************
+ * Various helpers
+ **************************************************/
+
+static inline u8 bcm47xxnflash_ops_bcm4706_ns_to_cycle(u16 ns, u16 clock)
+{
+        return ((ns * 1000 * clock) / 1000000) + 1;
+}
+
+/**************************************************
+ * NAND chip ops
+ **************************************************/
+
+/* Default nand_select_chip calls cmd_ctrl, which is not used in BCM4706 */
+static void bcm47xxnflash_ops_bcm4706_select_chip(struct mtd_info *mtd,
+                                                  int chip)
+{
+        return;
+}
+
+/**************************************************
+ * Init
+ **************************************************/
+
+int bcm47xxnflash_ops_bcm4706_init(struct bcm47xxnflash *b47n)
+{
+        int err;
+        u32 freq;
+        u16 clock;
+        u8 w0, w1, w2, w3, w4;
+
+        unsigned long chipsize; /* MiB */
+        u8 tbits, col_bits, col_size, row_bits, row_bsize;
+        u32 val;
+
+        b47n->nand_chip.select_chip = bcm47xxnflash_ops_bcm4706_select_chip;
+        b47n->nand_chip.ecc.mode = NAND_ECC_NONE; /* TODO: implement ECC */
+
+        /* Enable NAND flash access */
+        bcma_cc_set32(b47n->cc, BCMA_CC_4706_FLASHSCFG,
+                      BCMA_CC_4706_FLASHSCFG_NF1);
+
+        /* Configure wait counters */
+        if (b47n->cc->status & BCMA_CC_CHIPST_4706_PKG_OPTION) {
+                freq = 100000000;
+        } else {
+                freq = bcma_chipco_pll_read(b47n->cc, 4);
+                freq = (freq * 0xFFF) >> 3;
+                freq = (freq * 25000000) >> 3;
+        }
+        clock = freq / 1000000;
+        w0 = bcm47xxnflash_ops_bcm4706_ns_to_cycle(15, clock);
+        w1 = bcm47xxnflash_ops_bcm4706_ns_to_cycle(20, clock);
+        w2 = bcm47xxnflash_ops_bcm4706_ns_to_cycle(10, clock);
+        w3 = bcm47xxnflash_ops_bcm4706_ns_to_cycle(10, clock);
+        w4 = bcm47xxnflash_ops_bcm4706_ns_to_cycle(100, clock);
+        bcma_cc_write32(b47n->cc, BCMA_CC_NFLASH_WAITCNT0,
+                        (w4 << 24 | w3 << 18 | w2 << 12 | w1 << 6 | w0));
+
+        /* Scan NAND */
+        err = nand_scan(&b47n->mtd, 1);
+        if (err) {
+                pr_err("Could not scan NAND flash: %d\n", err);
+                goto exit;
+        }
+
+        /* Configure FLASH */
+        chipsize = b47n->nand_chip.chipsize >> 20;
+        tbits = ffs(chipsize); /* find first bit set */
+        if (!tbits || tbits != fls(chipsize)) {
+                pr_err("Invalid flash size: 0x%lX\n", chipsize);
+                err = -ENOTSUPP;
+                goto exit;
+        }
+        tbits += 19; /* Broadcom increases *index* by 20, we increase *pos* */
+
+        col_bits = b47n->nand_chip.page_shift + 1;
+        col_size = (col_bits + 7) / 8;
+
+        row_bits = tbits - col_bits + 1;
+        row_bsize = (row_bits + 7) / 8;
+
+        val = ((row_bsize - 1) << 6) | ((col_size - 1) << 4) | 2;
+        bcma_cc_write32(b47n->cc, BCMA_CC_NFLASH_CONF, val);
+
+exit:
+        if (err)
+                bcma_cc_mask32(b47n->cc, BCMA_CC_4706_FLASHSCFG,
+                               ~BCMA_CC_4706_FLASHSCFG_NF1);
+        return err;
+}