[U-Boot] [PATCH v2 4/5] Add fsl_iim driver

["Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>]

Add a fsl_iim driver common to i.MX and MPC.

Signed-off-by: Beno?t Th?baudeau <benoit.thebaudeau@advansee.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
---
This patch supersedes http://patchwork.ozlabs.org/patch/177245/ .
Changes for v2:
 - Rebase against latest master.

 .../drivers/misc/Makefile                          |    1 +
 /dev/null => u-boot-178d0cc/drivers/misc/fsl_iim.c |  318 ++++++++++++++++++++
 2 files changed, 319 insertions(+)
 create mode 100644 u-boot-178d0cc/drivers/misc/fsl_iim.c

diff --git u-boot-178d0cc.orig/drivers/misc/Makefile u-boot-178d0cc/drivers/misc/Makefile
index cdec88b..0833d78 100644
--- u-boot-178d0cc.orig/drivers/misc/Makefile
+++ u-boot-178d0cc/drivers/misc/Makefile
@@ -27,6 +27,7 @@ LIB	:= $(obj)libmisc.o
 
 COBJS-$(CONFIG_ALI152X) += ali512x.o
 COBJS-$(CONFIG_DS4510)  += ds4510.o
+COBJS-$(CONFIG_FSL_IIM) += fsl_iim.o
 COBJS-$(CONFIG_FSL_LAW) += fsl_law.o
 COBJS-$(CONFIG_GPIO_LED) += gpio_led.o
 COBJS-$(CONFIG_FSL_MC9SDZ60) += mc9sdz60.o
diff --git u-boot-178d0cc/drivers/misc/fsl_iim.c u-boot-178d0cc/drivers/misc/fsl_iim.c
new file mode 100644
index 0000000..1a3d5fc
--- /dev/null
+++ u-boot-178d0cc/drivers/misc/fsl_iim.c
@@ -0,0 +1,318 @@
+/*
+ * (C) Copyright 2009-2012 ADVANSEE
+ * Beno?t Th?baudeau <benoit.thebaudeau@advansee.com>
+ *
+ * Based on the mpc512x iim code:
+ * Copyright 2008 Silicon Turnkey Express, Inc.
+ * Martha Marx <mmarx@silicontkx.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <config.h>
+#include <common.h>
+#include <hwconfig.h>
+#include <fuse.h>
+#include <asm/errno.h>
+#include <asm/byteorder.h>
+#include <asm/io.h>
+
+/* FSL IIM-specific constants */
+#define STAT_BUSY		0x80
+#define STAT_PRGD		0x02
+#define STAT_SNSD		0x01
+
+#define STATM_PRGD_M		0x02
+#define STATM_SNSD_M		0x01
+
+#define ERR_PRGE		0x80
+#define ERR_WPE			0x40
+#define ERR_OPE			0x20
+#define ERR_RPE			0x10
+#define ERR_WLRE		0x08
+#define ERR_SNSE		0x04
+#define ERR_PARITYE		0x02
+
+#define EMASK_PRGE_M		0x80
+#define EMASK_WPE_M		0x40
+#define EMASK_OPE_M		0x20
+#define EMASK_RPE_M		0x10
+#define EMASK_WLRE_M		0x08
+#define EMASK_SNSE_M		0x04
+#define EMASK_PARITYE_M		0x02
+
+#define FCTL_DPC		0x80
+#define FCTL_PRG_LENGTH_MASK	0x70
+#define FCTL_ESNS_N		0x08
+#define FCTL_ESNS_0		0x04
+#define FCTL_ESNS_1		0x02
+#define FCTL_PRG		0x01
+
+#define UA_A_BANK_MASK		0x38
+#define UA_A_ROWH_MASK		0x07
+
+#define LA_A_ROWL_MASK		0xf8
+#define LA_A_BIT_MASK		0x07
+
+#define PREV_PROD_REV_MASK	0xf8
+#define PREV_PROD_VT_MASK	0x07
+
+/* Select the correct accessors depending on endianness */
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define iim_read32		in_le32
+#define iim_write32		out_le32
+#define iim_clrsetbits32	clrsetbits_le32
+#define iim_clrbits32		clrbits_le32
+#define iim_setbits32		setbits_le32
+#elif __BYTE_ORDER == __BIG_ENDIAN
+#define iim_read32		in_be32
+#define iim_write32		out_be32
+#define iim_clrsetbits32	clrsetbits_be32
+#define iim_clrbits32		clrbits_be32
+#define iim_setbits32		setbits_be32
+#else
+#error "Endianess is not defined: please fix to continue"
+#endif
+
+/* IIM control registers */
+struct fsl_iim {
+	u32 stat;
+	u32 statm;
+	u32 err;
+	u32 emask;
+	u32 fctl;
+	u32 ua;
+	u32 la;
+	u32 sdat;
+	u32 prev;
+	u32 srev;
+	u32 prg_p;
+	u32 scs[0x1f5];
+	struct {
+		u32 row[0x100];
+	} bank[8];
+};
+
+int fuse_read_bit(u32 bank, u32 row, u32 bit, u32 *val)
+{
+	int ret;
+
+	if (bit >= 8) {
+		puts("fsl_iim fuse read: Invalid argument\n");
+		return -EINVAL;
+	}
+
+	ret = fuse_read_row(bank, row, val);
+	if (ret)
+		return ret;
+
+	*val = !!(*val & 1 << bit);
+	return 0;
+}
+
+int fuse_read_row(u32 bank, u32 row, u32 *val)
+{
+	volatile struct fsl_iim *regs =
+			(struct fsl_iim *)CONFIG_SYS_FSL_IIM_ADDR;
+	u32 err;
+
+	if (bank >= ARRAY_SIZE(regs->bank) ||
+			row >= ARRAY_SIZE(regs->bank[0].row) ||
+			val == NULL) {
+		puts("fsl_iim fuse read: Invalid argument\n");
+		return -EINVAL;
+	}
+
+	iim_write32(&regs->err, iim_read32(&regs->err));
+	*val = iim_read32(&regs->bank[bank].row[row]);
+	err = iim_read32(&regs->err);
+	iim_write32(&regs->err, iim_read32(&regs->err));
+
+	if (err & ERR_RPE) {
+		puts("fsl_iim fuse read: Read protect error\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+int fuse_sense_bit(u32 bank, u32 row, u32 bit, u32 *val)
+{
+	int ret;
+
+	if (bit >= 8) {
+		puts("fsl_iim fuse sense: Invalid argument\n");
+		return -EINVAL;
+	}
+
+	ret = fuse_sense_row(bank, row, val);
+	if (ret)
+		return ret;
+
+	*val = !!(*val & 1 << bit);
+	return 0;
+}
+
+int fuse_sense_row(u32 bank, u32 row, u32 *val)
+{
+	volatile struct fsl_iim *regs =
+			(struct fsl_iim *)CONFIG_SYS_FSL_IIM_ADDR;
+	u32 stat, err;
+
+	if (bank >= ARRAY_SIZE(regs->bank) ||
+			row >= ARRAY_SIZE(regs->bank[0].row) ||
+			val == NULL) {
+		puts("fsl_iim fuse sense: Invalid argument\n");
+		return -EINVAL;
+	}
+
+	iim_write32(&regs->stat, iim_read32(&regs->stat));
+	iim_write32(&regs->err, iim_read32(&regs->err));
+	iim_write32(&regs->ua, bank << 3 | row >> 5);
+	iim_write32(&regs->la, row << 3 & 0xff);
+	iim_write32(&regs->fctl, iim_read32(&regs->fctl) | FCTL_ESNS_N);
+	while (iim_read32(&regs->stat) & STAT_BUSY)
+		udelay(20);
+	stat = iim_read32(&regs->stat);
+	err = iim_read32(&regs->err);
+	iim_write32(&regs->stat, iim_read32(&regs->stat));
+	iim_write32(&regs->err, iim_read32(&regs->err));
+
+	if (err & ERR_SNSE) {
+		puts("fsl_iim fuse sense: Explicit sense cycle error\n");
+		return -EIO;
+	}
+
+	if (!(stat & STAT_SNSD)) {
+		puts("fsl_iim fuse sense: Explicit sense cycle "
+				"did not complete\n");
+		return -EIO;
+	}
+
+	*val = iim_read32(&regs->sdat);
+	return 0;
+}
+
+int fuse_prog_bit(u32 bank, u32 row, u32 bit)
+{
+	volatile struct fsl_iim *regs =
+			(struct fsl_iim *)CONFIG_SYS_FSL_IIM_ADDR;
+	u32 stat, err;
+
+	if (bank >= ARRAY_SIZE(regs->bank) ||
+			row >= ARRAY_SIZE(regs->bank[0].row) ||
+			bit >= 8) {
+		puts("fsl_iim fuse program: Invalid argument\n");
+		return -EINVAL;
+	}
+
+	iim_write32(&regs->stat, iim_read32(&regs->stat));
+	iim_write32(&regs->err, iim_read32(&regs->err));
+	iim_write32(&regs->ua, bank << 3 | row >> 5);
+	iim_write32(&regs->la, (row << 3 | bit) & 0xff);
+	iim_write32(&regs->prg_p, 0xaa);
+	iim_write32(&regs->fctl, iim_read32(&regs->fctl) | FCTL_PRG);
+	while (iim_read32(&regs->stat) & STAT_BUSY)
+		udelay(20);
+	stat = iim_read32(&regs->stat);
+	err = iim_read32(&regs->err);
+	iim_write32(&regs->stat, iim_read32(&regs->stat));
+	iim_write32(&regs->err, iim_read32(&regs->err));
+	iim_write32(&regs->prg_p, 0x00);
+
+	if (err & ERR_PRGE) {
+		puts("fsl_iim fuse program: Program error\n");
+		return -EIO;
+	}
+
+	if (err & ERR_WPE) {
+		puts("fsl_iim fuse program: Write protect error\n");
+		return -EIO;
+	}
+
+	if (!(stat & STAT_PRGD)) {
+		puts("fsl_iim fuse program: Program did not complete\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+int fuse_prog_row(u32 bank, u32 row, u32 val)
+{
+	int bit, ret;
+
+	if (val & ~0xff) {
+		puts("fsl_iim fuse program: Invalid argument\n");
+		return -EINVAL;
+	}
+
+	for (bit = 0; val; bit++, val >>= 1)
+		if (val & 0x01) {
+			ret = fuse_prog_bit(bank, row, bit);
+			if (ret)
+				return ret;
+		}
+
+	return 0;
+}
+
+int fuse_override_bit(u32 bank, u32 row, u32 bit, u32 val)
+{
+	u32 row_val;
+	int ret;
+
+	if (bit >= 8 || val > 1) {
+		puts("fsl_iim fuse override: Invalid argument\n");
+		return -EINVAL;
+	}
+
+	ret = fuse_read_row(bank, row, &row_val);
+	if (ret)
+		return ret;
+
+	return fuse_override_row(bank, row,
+			(row_val & ~(1 << bit)) | val << bit);
+}
+
+int fuse_override_row(u32 bank, u32 row, u32 val)
+{
+	volatile struct fsl_iim *regs =
+			(struct fsl_iim *)CONFIG_SYS_FSL_IIM_ADDR;
+	u32 err;
+
+	if (bank >= ARRAY_SIZE(regs->bank) ||
+			row >= ARRAY_SIZE(regs->bank[0].row) ||
+			val & ~0xff) {
+		puts("fsl_iim fuse override: Invalid argument\n");
+		return -EINVAL;
+	}
+
+	iim_write32(&regs->err, iim_read32(&regs->err));
+	iim_write32(&regs->bank[bank].row[row], val);
+	err = iim_read32(&regs->err);
+	iim_write32(&regs->err, iim_read32(&regs->err));
+
+	if (err & ERR_OPE) {
+		puts("fsl_iim fuse override: Override protect error\n");
+		return -EIO;
+	}
+
+	return 0;
+}