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-rw-r--r--drivers/mtd/lpddr/Kconfig29
-rw-r--r--drivers/mtd/lpddr/Makefile7
-rw-r--r--drivers/mtd/lpddr/lpddr2_nvm.c507
-rw-r--r--drivers/mtd/lpddr/lpddr_cmds.c751
-rw-r--r--drivers/mtd/lpddr/qinfo_probe.c249
5 files changed, 1543 insertions, 0 deletions
diff --git a/drivers/mtd/lpddr/Kconfig b/drivers/mtd/lpddr/Kconfig
new file mode 100644
index 000000000..3a19cbee2
--- /dev/null
+++ b/drivers/mtd/lpddr/Kconfig
@@ -0,0 +1,29 @@
+menu "LPDDR & LPDDR2 PCM memory drivers"
+ depends on MTD
+
+config MTD_LPDDR
+ tristate "Support for LPDDR flash chips"
+ select MTD_QINFO_PROBE
+ help
+ This option enables support of LPDDR (Low power double data rate)
+ flash chips. Synonymous with Mobile-DDR. It is a new standard for
+ DDR memories, intended for battery-operated systems.
+
+config MTD_QINFO_PROBE
+ depends on MTD_LPDDR
+ tristate "Detect flash chips by QINFO probe"
+ help
+ Device Information for LPDDR chips is offered through the Overlay
+ Window QINFO interface, permits software to be used for entire
+ families of devices. This serves similar purpose of CFI on legacy
+ Flash products
+
+config MTD_LPDDR2_NVM
+ # ARM dependency is only for writel_relaxed()
+ depends on MTD && ARM
+ tristate "Support for LPDDR2-NVM flash chips"
+ help
+ This option enables support of PCM memories with a LPDDR2-NVM
+ (Low power double data rate 2) interface.
+
+endmenu
diff --git a/drivers/mtd/lpddr/Makefile b/drivers/mtd/lpddr/Makefile
new file mode 100644
index 000000000..881d440d4
--- /dev/null
+++ b/drivers/mtd/lpddr/Makefile
@@ -0,0 +1,7 @@
+#
+# linux/drivers/mtd/lpddr/Makefile
+#
+
+obj-$(CONFIG_MTD_QINFO_PROBE) += qinfo_probe.o
+obj-$(CONFIG_MTD_LPDDR) += lpddr_cmds.o
+obj-$(CONFIG_MTD_LPDDR2_NVM) += lpddr2_nvm.o
diff --git a/drivers/mtd/lpddr/lpddr2_nvm.c b/drivers/mtd/lpddr/lpddr2_nvm.c
new file mode 100644
index 000000000..063cec40d
--- /dev/null
+++ b/drivers/mtd/lpddr/lpddr2_nvm.c
@@ -0,0 +1,507 @@
+/*
+ * LPDDR2-NVM MTD driver. This module provides read, write, erase, lock/unlock
+ * support for LPDDR2-NVM PCM memories
+ *
+ * Copyright © 2012 Micron Technology, Inc.
+ *
+ * Vincenzo Aliberti <vincenzo.aliberti@gmail.com>
+ * Domenico Manna <domenico.manna@gmail.com>
+ * Many thanks to Andrea Vigilante for initial enabling
+ *
+ * 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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/ioport.h>
+#include <linux/err.h>
+
+/* Parameters */
+#define ERASE_BLOCKSIZE (0x00020000/2) /* in Word */
+#define WRITE_BUFFSIZE (0x00000400/2) /* in Word */
+#define OW_BASE_ADDRESS 0x00000000 /* OW offset */
+#define BUS_WIDTH 0x00000020 /* x32 devices */
+
+/* PFOW symbols address offset */
+#define PFOW_QUERY_STRING_P (0x0000/2) /* in Word */
+#define PFOW_QUERY_STRING_F (0x0002/2) /* in Word */
+#define PFOW_QUERY_STRING_O (0x0004/2) /* in Word */
+#define PFOW_QUERY_STRING_W (0x0006/2) /* in Word */
+
+/* OW registers address */
+#define CMD_CODE_OFS (0x0080/2) /* in Word */
+#define CMD_DATA_OFS (0x0084/2) /* in Word */
+#define CMD_ADD_L_OFS (0x0088/2) /* in Word */
+#define CMD_ADD_H_OFS (0x008A/2) /* in Word */
+#define MPR_L_OFS (0x0090/2) /* in Word */
+#define MPR_H_OFS (0x0092/2) /* in Word */
+#define CMD_EXEC_OFS (0x00C0/2) /* in Word */
+#define STATUS_REG_OFS (0x00CC/2) /* in Word */
+#define PRG_BUFFER_OFS (0x0010/2) /* in Word */
+
+/* Datamask */
+#define MR_CFGMASK 0x8000
+#define SR_OK_DATAMASK 0x0080
+
+/* LPDDR2-NVM Commands */
+#define LPDDR2_NVM_LOCK 0x0061
+#define LPDDR2_NVM_UNLOCK 0x0062
+#define LPDDR2_NVM_SW_PROGRAM 0x0041
+#define LPDDR2_NVM_SW_OVERWRITE 0x0042
+#define LPDDR2_NVM_BUF_PROGRAM 0x00E9
+#define LPDDR2_NVM_BUF_OVERWRITE 0x00EA
+#define LPDDR2_NVM_ERASE 0x0020
+
+/* LPDDR2-NVM Registers offset */
+#define LPDDR2_MODE_REG_DATA 0x0040
+#define LPDDR2_MODE_REG_CFG 0x0050
+
+/*
+ * Internal Type Definitions
+ * pcm_int_data contains memory controller details:
+ * @reg_data : LPDDR2_MODE_REG_DATA register address after remapping
+ * @reg_cfg : LPDDR2_MODE_REG_CFG register address after remapping
+ * &bus_width: memory bus-width (eg: x16 2 Bytes, x32 4 Bytes)
+ */
+struct pcm_int_data {
+ void __iomem *ctl_regs;
+ int bus_width;
+};
+
+static DEFINE_MUTEX(lpdd2_nvm_mutex);
+
+/*
+ * Build a map_word starting from an u_long
+ */
+static inline map_word build_map_word(u_long myword)
+{
+ map_word val = { {0} };
+ val.x[0] = myword;
+ return val;
+}
+
+/*
+ * Build Mode Register Configuration DataMask based on device bus-width
+ */
+static inline u_int build_mr_cfgmask(u_int bus_width)
+{
+ u_int val = MR_CFGMASK;
+
+ if (bus_width == 0x0004) /* x32 device */
+ val = val << 16;
+
+ return val;
+}
+
+/*
+ * Build Status Register OK DataMask based on device bus-width
+ */
+static inline u_int build_sr_ok_datamask(u_int bus_width)
+{
+ u_int val = SR_OK_DATAMASK;
+
+ if (bus_width == 0x0004) /* x32 device */
+ val = (val << 16)+val;
+
+ return val;
+}
+
+/*
+ * Evaluates Overlay Window Control Registers address
+ */
+static inline u_long ow_reg_add(struct map_info *map, u_long offset)
+{
+ u_long val = 0;
+ struct pcm_int_data *pcm_data = map->fldrv_priv;
+
+ val = map->pfow_base + offset*pcm_data->bus_width;
+
+ return val;
+}
+
+/*
+ * Enable lpddr2-nvm Overlay Window
+ * Overlay Window is a memory mapped area containing all LPDDR2-NVM registers
+ * used by device commands as well as uservisible resources like Device Status
+ * Register, Device ID, etc
+ */
+static inline void ow_enable(struct map_info *map)
+{
+ struct pcm_int_data *pcm_data = map->fldrv_priv;
+
+ writel_relaxed(build_mr_cfgmask(pcm_data->bus_width) | 0x18,
+ pcm_data->ctl_regs + LPDDR2_MODE_REG_CFG);
+ writel_relaxed(0x01, pcm_data->ctl_regs + LPDDR2_MODE_REG_DATA);
+}
+
+/*
+ * Disable lpddr2-nvm Overlay Window
+ * Overlay Window is a memory mapped area containing all LPDDR2-NVM registers
+ * used by device commands as well as uservisible resources like Device Status
+ * Register, Device ID, etc
+ */
+static inline void ow_disable(struct map_info *map)
+{
+ struct pcm_int_data *pcm_data = map->fldrv_priv;
+
+ writel_relaxed(build_mr_cfgmask(pcm_data->bus_width) | 0x18,
+ pcm_data->ctl_regs + LPDDR2_MODE_REG_CFG);
+ writel_relaxed(0x02, pcm_data->ctl_regs + LPDDR2_MODE_REG_DATA);
+}
+
+/*
+ * Execute lpddr2-nvm operations
+ */
+static int lpddr2_nvm_do_op(struct map_info *map, u_long cmd_code,
+ u_long cmd_data, u_long cmd_add, u_long cmd_mpr, u_char *buf)
+{
+ map_word add_l = { {0} }, add_h = { {0} }, mpr_l = { {0} },
+ mpr_h = { {0} }, data_l = { {0} }, cmd = { {0} },
+ exec_cmd = { {0} }, sr;
+ map_word data_h = { {0} }; /* only for 2x x16 devices stacked */
+ u_long i, status_reg, prg_buff_ofs;
+ struct pcm_int_data *pcm_data = map->fldrv_priv;
+ u_int sr_ok_datamask = build_sr_ok_datamask(pcm_data->bus_width);
+
+ /* Builds low and high words for OW Control Registers */
+ add_l.x[0] = cmd_add & 0x0000FFFF;
+ add_h.x[0] = (cmd_add >> 16) & 0x0000FFFF;
+ mpr_l.x[0] = cmd_mpr & 0x0000FFFF;
+ mpr_h.x[0] = (cmd_mpr >> 16) & 0x0000FFFF;
+ cmd.x[0] = cmd_code & 0x0000FFFF;
+ exec_cmd.x[0] = 0x0001;
+ data_l.x[0] = cmd_data & 0x0000FFFF;
+ data_h.x[0] = (cmd_data >> 16) & 0x0000FFFF; /* only for 2x x16 */
+
+ /* Set Overlay Window Control Registers */
+ map_write(map, cmd, ow_reg_add(map, CMD_CODE_OFS));
+ map_write(map, data_l, ow_reg_add(map, CMD_DATA_OFS));
+ map_write(map, add_l, ow_reg_add(map, CMD_ADD_L_OFS));
+ map_write(map, add_h, ow_reg_add(map, CMD_ADD_H_OFS));
+ map_write(map, mpr_l, ow_reg_add(map, MPR_L_OFS));
+ map_write(map, mpr_h, ow_reg_add(map, MPR_H_OFS));
+ if (pcm_data->bus_width == 0x0004) { /* 2x16 devices stacked */
+ map_write(map, cmd, ow_reg_add(map, CMD_CODE_OFS) + 2);
+ map_write(map, data_h, ow_reg_add(map, CMD_DATA_OFS) + 2);
+ map_write(map, add_l, ow_reg_add(map, CMD_ADD_L_OFS) + 2);
+ map_write(map, add_h, ow_reg_add(map, CMD_ADD_H_OFS) + 2);
+ map_write(map, mpr_l, ow_reg_add(map, MPR_L_OFS) + 2);
+ map_write(map, mpr_h, ow_reg_add(map, MPR_H_OFS) + 2);
+ }
+
+ /* Fill Program Buffer */
+ if ((cmd_code == LPDDR2_NVM_BUF_PROGRAM) ||
+ (cmd_code == LPDDR2_NVM_BUF_OVERWRITE)) {
+ prg_buff_ofs = (map_read(map,
+ ow_reg_add(map, PRG_BUFFER_OFS))).x[0];
+ for (i = 0; i < cmd_mpr; i++) {
+ map_write(map, build_map_word(buf[i]), map->pfow_base +
+ prg_buff_ofs + i);
+ }
+ }
+
+ /* Command Execute */
+ map_write(map, exec_cmd, ow_reg_add(map, CMD_EXEC_OFS));
+ if (pcm_data->bus_width == 0x0004) /* 2x16 devices stacked */
+ map_write(map, exec_cmd, ow_reg_add(map, CMD_EXEC_OFS) + 2);
+
+ /* Status Register Check */
+ do {
+ sr = map_read(map, ow_reg_add(map, STATUS_REG_OFS));
+ status_reg = sr.x[0];
+ if (pcm_data->bus_width == 0x0004) {/* 2x16 devices stacked */
+ sr = map_read(map, ow_reg_add(map,
+ STATUS_REG_OFS) + 2);
+ status_reg += sr.x[0] << 16;
+ }
+ } while ((status_reg & sr_ok_datamask) != sr_ok_datamask);
+
+ return (((status_reg & sr_ok_datamask) == sr_ok_datamask) ? 0 : -EIO);
+}
+
+/*
+ * Execute lpddr2-nvm operations @ block level
+ */
+static int lpddr2_nvm_do_block_op(struct mtd_info *mtd, loff_t start_add,
+ uint64_t len, u_char block_op)
+{
+ struct map_info *map = mtd->priv;
+ u_long add, end_add;
+ int ret = 0;
+
+ mutex_lock(&lpdd2_nvm_mutex);
+
+ ow_enable(map);
+
+ add = start_add;
+ end_add = add + len;
+
+ do {
+ ret = lpddr2_nvm_do_op(map, block_op, 0x00, add, add, NULL);
+ if (ret)
+ goto out;
+ add += mtd->erasesize;
+ } while (add < end_add);
+
+out:
+ ow_disable(map);
+ mutex_unlock(&lpdd2_nvm_mutex);
+ return ret;
+}
+
+/*
+ * verify presence of PFOW string
+ */
+static int lpddr2_nvm_pfow_present(struct map_info *map)
+{
+ map_word pfow_val[4];
+ unsigned int found = 1;
+
+ mutex_lock(&lpdd2_nvm_mutex);
+
+ ow_enable(map);
+
+ /* Load string from array */
+ pfow_val[0] = map_read(map, ow_reg_add(map, PFOW_QUERY_STRING_P));
+ pfow_val[1] = map_read(map, ow_reg_add(map, PFOW_QUERY_STRING_F));
+ pfow_val[2] = map_read(map, ow_reg_add(map, PFOW_QUERY_STRING_O));
+ pfow_val[3] = map_read(map, ow_reg_add(map, PFOW_QUERY_STRING_W));
+
+ /* Verify the string loaded vs expected */
+ if (!map_word_equal(map, build_map_word('P'), pfow_val[0]))
+ found = 0;
+ if (!map_word_equal(map, build_map_word('F'), pfow_val[1]))
+ found = 0;
+ if (!map_word_equal(map, build_map_word('O'), pfow_val[2]))
+ found = 0;
+ if (!map_word_equal(map, build_map_word('W'), pfow_val[3]))
+ found = 0;
+
+ ow_disable(map);
+
+ mutex_unlock(&lpdd2_nvm_mutex);
+
+ return found;
+}
+
+/*
+ * lpddr2_nvm driver read method
+ */
+static int lpddr2_nvm_read(struct mtd_info *mtd, loff_t start_add,
+ size_t len, size_t *retlen, u_char *buf)
+{
+ struct map_info *map = mtd->priv;
+
+ mutex_lock(&lpdd2_nvm_mutex);
+
+ *retlen = len;
+
+ map_copy_from(map, buf, start_add, *retlen);
+
+ mutex_unlock(&lpdd2_nvm_mutex);
+ return 0;
+}
+
+/*
+ * lpddr2_nvm driver write method
+ */
+static int lpddr2_nvm_write(struct mtd_info *mtd, loff_t start_add,
+ size_t len, size_t *retlen, const u_char *buf)
+{
+ struct map_info *map = mtd->priv;
+ struct pcm_int_data *pcm_data = map->fldrv_priv;
+ u_long add, current_len, tot_len, target_len, my_data;
+ u_char *write_buf = (u_char *)buf;
+ int ret = 0;
+
+ mutex_lock(&lpdd2_nvm_mutex);
+
+ ow_enable(map);
+
+ /* Set start value for the variables */
+ add = start_add;
+ target_len = len;
+ tot_len = 0;
+
+ while (tot_len < target_len) {
+ if (!(IS_ALIGNED(add, mtd->writesize))) { /* do sw program */
+ my_data = write_buf[tot_len];
+ my_data += (write_buf[tot_len+1]) << 8;
+ if (pcm_data->bus_width == 0x0004) {/* 2x16 devices */
+ my_data += (write_buf[tot_len+2]) << 16;
+ my_data += (write_buf[tot_len+3]) << 24;
+ }
+ ret = lpddr2_nvm_do_op(map, LPDDR2_NVM_SW_OVERWRITE,
+ my_data, add, 0x00, NULL);
+ if (ret)
+ goto out;
+
+ add += pcm_data->bus_width;
+ tot_len += pcm_data->bus_width;
+ } else { /* do buffer program */
+ current_len = min(target_len - tot_len,
+ (u_long) mtd->writesize);
+ ret = lpddr2_nvm_do_op(map, LPDDR2_NVM_BUF_OVERWRITE,
+ 0x00, add, current_len, write_buf + tot_len);
+ if (ret)
+ goto out;
+
+ add += current_len;
+ tot_len += current_len;
+ }
+ }
+
+out:
+ *retlen = tot_len;
+ ow_disable(map);
+ mutex_unlock(&lpdd2_nvm_mutex);
+ return ret;
+}
+
+/*
+ * lpddr2_nvm driver erase method
+ */
+static int lpddr2_nvm_erase(struct mtd_info *mtd, struct erase_info *instr)
+{
+ int ret = lpddr2_nvm_do_block_op(mtd, instr->addr, instr->len,
+ LPDDR2_NVM_ERASE);
+ if (!ret) {
+ instr->state = MTD_ERASE_DONE;
+ mtd_erase_callback(instr);
+ }
+
+ return ret;
+}
+
+/*
+ * lpddr2_nvm driver unlock method
+ */
+static int lpddr2_nvm_unlock(struct mtd_info *mtd, loff_t start_add,
+ uint64_t len)
+{
+ return lpddr2_nvm_do_block_op(mtd, start_add, len, LPDDR2_NVM_UNLOCK);
+}
+
+/*
+ * lpddr2_nvm driver lock method
+ */
+static int lpddr2_nvm_lock(struct mtd_info *mtd, loff_t start_add,
+ uint64_t len)
+{
+ return lpddr2_nvm_do_block_op(mtd, start_add, len, LPDDR2_NVM_LOCK);
+}
+
+/*
+ * lpddr2_nvm driver probe method
+ */
+static int lpddr2_nvm_probe(struct platform_device *pdev)
+{
+ struct map_info *map;
+ struct mtd_info *mtd;
+ struct resource *add_range;
+ struct resource *control_regs;
+ struct pcm_int_data *pcm_data;
+
+ /* Allocate memory control_regs data structures */
+ pcm_data = devm_kzalloc(&pdev->dev, sizeof(*pcm_data), GFP_KERNEL);
+ if (!pcm_data)
+ return -ENOMEM;
+
+ pcm_data->bus_width = BUS_WIDTH;
+
+ /* Allocate memory for map_info & mtd_info data structures */
+ map = devm_kzalloc(&pdev->dev, sizeof(*map), GFP_KERNEL);
+ if (!map)
+ return -ENOMEM;
+
+ mtd = devm_kzalloc(&pdev->dev, sizeof(*mtd), GFP_KERNEL);
+ if (!mtd)
+ return -ENOMEM;
+
+ /* lpddr2_nvm address range */
+ add_range = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ /* Populate map_info data structure */
+ *map = (struct map_info) {
+ .virt = devm_ioremap_resource(&pdev->dev, add_range),
+ .name = pdev->dev.init_name,
+ .phys = add_range->start,
+ .size = resource_size(add_range),
+ .bankwidth = pcm_data->bus_width / 2,
+ .pfow_base = OW_BASE_ADDRESS,
+ .fldrv_priv = pcm_data,
+ };
+ if (IS_ERR(map->virt))
+ return PTR_ERR(map->virt);
+
+ simple_map_init(map); /* fill with default methods */
+
+ control_regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ pcm_data->ctl_regs = devm_ioremap_resource(&pdev->dev, control_regs);
+ if (IS_ERR(pcm_data->ctl_regs))
+ return PTR_ERR(pcm_data->ctl_regs);
+
+ /* Populate mtd_info data structure */
+ *mtd = (struct mtd_info) {
+ .name = pdev->dev.init_name,
+ .type = MTD_RAM,
+ .priv = map,
+ .size = resource_size(add_range),
+ .erasesize = ERASE_BLOCKSIZE * pcm_data->bus_width,
+ .writesize = 1,
+ .writebufsize = WRITE_BUFFSIZE * pcm_data->bus_width,
+ .flags = (MTD_CAP_NVRAM | MTD_POWERUP_LOCK),
+ ._read = lpddr2_nvm_read,
+ ._write = lpddr2_nvm_write,
+ ._erase = lpddr2_nvm_erase,
+ ._unlock = lpddr2_nvm_unlock,
+ ._lock = lpddr2_nvm_lock,
+ };
+
+ /* Verify the presence of the device looking for PFOW string */
+ if (!lpddr2_nvm_pfow_present(map)) {
+ pr_err("device not recognized\n");
+ return -EINVAL;
+ }
+ /* Parse partitions and register the MTD device */
+ return mtd_device_parse_register(mtd, NULL, NULL, NULL, 0);
+}
+
+/*
+ * lpddr2_nvm driver remove method
+ */
+static int lpddr2_nvm_remove(struct platform_device *pdev)
+{
+ return mtd_device_unregister(dev_get_drvdata(&pdev->dev));
+}
+
+/* Initialize platform_driver data structure for lpddr2_nvm */
+static struct platform_driver lpddr2_nvm_drv = {
+ .driver = {
+ .name = "lpddr2_nvm",
+ },
+ .probe = lpddr2_nvm_probe,
+ .remove = lpddr2_nvm_remove,
+};
+
+module_platform_driver(lpddr2_nvm_drv);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Vincenzo Aliberti <vincenzo.aliberti@gmail.com>");
+MODULE_DESCRIPTION("MTD driver for LPDDR2-NVM PCM memories");
diff --git a/drivers/mtd/lpddr/lpddr_cmds.c b/drivers/mtd/lpddr/lpddr_cmds.c
new file mode 100644
index 000000000..018c75faa
--- /dev/null
+++ b/drivers/mtd/lpddr/lpddr_cmds.c
@@ -0,0 +1,751 @@
+/*
+ * LPDDR flash memory device operations. This module provides read, write,
+ * erase, lock/unlock support for LPDDR flash memories
+ * (C) 2008 Korolev Alexey <akorolev@infradead.org>
+ * (C) 2008 Vasiliy Leonenko <vasiliy.leonenko@gmail.com>
+ * Many thanks to Roman Borisov for initial enabling
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ * TODO:
+ * Implement VPP management
+ * Implement XIP support
+ * Implement OTP support
+ */
+#include <linux/mtd/pfow.h>
+#include <linux/mtd/qinfo.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+static int lpddr_read(struct mtd_info *mtd, loff_t adr, size_t len,
+ size_t *retlen, u_char *buf);
+static int lpddr_write_buffers(struct mtd_info *mtd, loff_t to,
+ size_t len, size_t *retlen, const u_char *buf);
+static int lpddr_writev(struct mtd_info *mtd, const struct kvec *vecs,
+ unsigned long count, loff_t to, size_t *retlen);
+static int lpddr_erase(struct mtd_info *mtd, struct erase_info *instr);
+static int lpddr_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
+static int lpddr_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
+static int lpddr_point(struct mtd_info *mtd, loff_t adr, size_t len,
+ size_t *retlen, void **mtdbuf, resource_size_t *phys);
+static int lpddr_unpoint(struct mtd_info *mtd, loff_t adr, size_t len);
+static int get_chip(struct map_info *map, struct flchip *chip, int mode);
+static int chip_ready(struct map_info *map, struct flchip *chip, int mode);
+static void put_chip(struct map_info *map, struct flchip *chip);
+
+struct mtd_info *lpddr_cmdset(struct map_info *map)
+{
+ struct lpddr_private *lpddr = map->fldrv_priv;
+ struct flchip_shared *shared;
+ struct flchip *chip;
+ struct mtd_info *mtd;
+ int numchips;
+ int i, j;
+
+ mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
+ if (!mtd)
+ return NULL;
+ mtd->priv = map;
+ mtd->type = MTD_NORFLASH;
+
+ /* Fill in the default mtd operations */
+ mtd->_read = lpddr_read;
+ mtd->type = MTD_NORFLASH;
+ mtd->flags = MTD_CAP_NORFLASH;
+ mtd->flags &= ~MTD_BIT_WRITEABLE;
+ mtd->_erase = lpddr_erase;
+ mtd->_write = lpddr_write_buffers;
+ mtd->_writev = lpddr_writev;
+ mtd->_lock = lpddr_lock;
+ mtd->_unlock = lpddr_unlock;
+ if (map_is_linear(map)) {
+ mtd->_point = lpddr_point;
+ mtd->_unpoint = lpddr_unpoint;
+ }
+ mtd->size = 1 << lpddr->qinfo->DevSizeShift;
+ mtd->erasesize = 1 << lpddr->qinfo->UniformBlockSizeShift;
+ mtd->writesize = 1 << lpddr->qinfo->BufSizeShift;
+
+ shared = kmalloc(sizeof(struct flchip_shared) * lpddr->numchips,
+ GFP_KERNEL);
+ if (!shared) {
+ kfree(lpddr);
+ kfree(mtd);
+ return NULL;
+ }
+
+ chip = &lpddr->chips[0];
+ numchips = lpddr->numchips / lpddr->qinfo->HWPartsNum;
+ for (i = 0; i < numchips; i++) {
+ shared[i].writing = shared[i].erasing = NULL;
+ mutex_init(&shared[i].lock);
+ for (j = 0; j < lpddr->qinfo->HWPartsNum; j++) {
+ *chip = lpddr->chips[i];
+ chip->start += j << lpddr->chipshift;
+ chip->oldstate = chip->state = FL_READY;
+ chip->priv = &shared[i];
+ /* those should be reset too since
+ they create memory references. */
+ init_waitqueue_head(&chip->wq);
+ mutex_init(&chip->mutex);
+ chip++;
+ }
+ }
+
+ return mtd;
+}
+EXPORT_SYMBOL(lpddr_cmdset);
+
+static int wait_for_ready(struct map_info *map, struct flchip *chip,
+ unsigned int chip_op_time)
+{
+ unsigned int timeo, reset_timeo, sleep_time;
+ unsigned int dsr;
+ flstate_t chip_state = chip->state;
+ int ret = 0;
+
+ /* set our timeout to 8 times the expected delay */
+ timeo = chip_op_time * 8;
+ if (!timeo)
+ timeo = 500000;
+ reset_timeo = timeo;
+ sleep_time = chip_op_time / 2;
+
+ for (;;) {
+ dsr = CMDVAL(map_read(map, map->pfow_base + PFOW_DSR));
+ if (dsr & DSR_READY_STATUS)
+ break;
+ if (!timeo) {
+ printk(KERN_ERR "%s: Flash timeout error state %d \n",
+ map->name, chip_state);
+ ret = -ETIME;
+ break;
+ }
+
+ /* OK Still waiting. Drop the lock, wait a while and retry. */
+ mutex_unlock(&chip->mutex);
+ if (sleep_time >= 1000000/HZ) {
+ /*
+ * Half of the normal delay still remaining
+ * can be performed with a sleeping delay instead
+ * of busy waiting.
+ */
+ msleep(sleep_time/1000);
+ timeo -= sleep_time;
+ sleep_time = 1000000/HZ;
+ } else {
+ udelay(1);
+ cond_resched();
+ timeo--;
+ }
+ mutex_lock(&chip->mutex);
+
+ while (chip->state != chip_state) {
+ /* Someone's suspended the operation: sleep */
+ DECLARE_WAITQUEUE(wait, current);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ add_wait_queue(&chip->wq, &wait);
+ mutex_unlock(&chip->mutex);
+ schedule();
+ remove_wait_queue(&chip->wq, &wait);
+ mutex_lock(&chip->mutex);
+ }
+ if (chip->erase_suspended || chip->write_suspended) {
+ /* Suspend has occurred while sleep: reset timeout */
+ timeo = reset_timeo;
+ chip->erase_suspended = chip->write_suspended = 0;
+ }
+ }
+ /* check status for errors */
+ if (dsr & DSR_ERR) {
+ /* Clear DSR*/
+ map_write(map, CMD(~(DSR_ERR)), map->pfow_base + PFOW_DSR);
+ printk(KERN_WARNING"%s: Bad status on wait: 0x%x \n",
+ map->name, dsr);
+ print_drs_error(dsr);
+ ret = -EIO;
+ }
+ chip->state = FL_READY;
+ return ret;
+}
+
+static int get_chip(struct map_info *map, struct flchip *chip, int mode)
+{
+ int ret;
+ DECLARE_WAITQUEUE(wait, current);
+
+ retry:
+ if (chip->priv && (mode == FL_WRITING || mode == FL_ERASING)
+ && chip->state != FL_SYNCING) {
+ /*
+ * OK. We have possibility for contension on the write/erase
+ * operations which are global to the real chip and not per
+ * partition. So let's fight it over in the partition which
+ * currently has authority on the operation.
+ *
+ * The rules are as follows:
+ *
+ * - any write operation must own shared->writing.
+ *
+ * - any erase operation must own _both_ shared->writing and
+ * shared->erasing.
+ *
+ * - contension arbitration is handled in the owner's context.
+ *
+ * The 'shared' struct can be read and/or written only when
+ * its lock is taken.
+ */
+ struct flchip_shared *shared = chip->priv;
+ struct flchip *contender;
+ mutex_lock(&shared->lock);
+ contender = shared->writing;
+ if (contender && contender != chip) {
+ /*
+ * The engine to perform desired operation on this
+ * partition is already in use by someone else.
+ * Let's fight over it in the context of the chip
+ * currently using it. If it is possible to suspend,
+ * that other partition will do just that, otherwise
+ * it'll happily send us to sleep. In any case, when
+ * get_chip returns success we're clear to go ahead.
+ */
+ ret = mutex_trylock(&contender->mutex);
+ mutex_unlock(&shared->lock);
+ if (!ret)
+ goto retry;
+ mutex_unlock(&chip->mutex);
+ ret = chip_ready(map, contender, mode);
+ mutex_lock(&chip->mutex);
+
+ if (ret == -EAGAIN) {
+ mutex_unlock(&contender->mutex);
+ goto retry;
+ }
+ if (ret) {
+ mutex_unlock(&contender->mutex);
+ return ret;
+ }
+ mutex_lock(&shared->lock);
+
+ /* We should not own chip if it is already in FL_SYNCING
+ * state. Put contender and retry. */
+ if (chip->state == FL_SYNCING) {
+ put_chip(map, contender);
+ mutex_unlock(&contender->mutex);
+ goto retry;
+ }
+ mutex_unlock(&contender->mutex);
+ }
+
+ /* Check if we have suspended erase on this chip.
+ Must sleep in such a case. */
+ if (mode == FL_ERASING && shared->erasing
+ && shared->erasing->oldstate == FL_ERASING) {
+ mutex_unlock(&shared->lock);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ add_wait_queue(&chip->wq, &wait);
+ mutex_unlock(&chip->mutex);
+ schedule();
+ remove_wait_queue(&chip->wq, &wait);
+ mutex_lock(&chip->mutex);
+ goto retry;
+ }
+
+ /* We now own it */
+ shared->writing = chip;
+ if (mode == FL_ERASING)
+ shared->erasing = chip;
+ mutex_unlock(&shared->lock);
+ }
+
+ ret = chip_ready(map, chip, mode);
+ if (ret == -EAGAIN)
+ goto retry;
+
+ return ret;
+}
+
+static int chip_ready(struct map_info *map, struct flchip *chip, int mode)
+{
+ struct lpddr_private *lpddr = map->fldrv_priv;
+ int ret = 0;
+ DECLARE_WAITQUEUE(wait, current);
+
+ /* Prevent setting state FL_SYNCING for chip in suspended state. */
+ if (FL_SYNCING == mode && FL_READY != chip->oldstate)
+ goto sleep;
+
+ switch (chip->state) {
+ case FL_READY:
+ case FL_JEDEC_QUERY:
+ return 0;
+
+ case FL_ERASING:
+ if (!lpddr->qinfo->SuspEraseSupp ||
+ !(mode == FL_READY || mode == FL_POINT))
+ goto sleep;
+
+ map_write(map, CMD(LPDDR_SUSPEND),
+ map->pfow_base + PFOW_PROGRAM_ERASE_SUSPEND);
+ chip->oldstate = FL_ERASING;
+ chip->state = FL_ERASE_SUSPENDING;
+ ret = wait_for_ready(map, chip, 0);
+ if (ret) {
+ /* Oops. something got wrong. */
+ /* Resume and pretend we weren't here. */
+ put_chip(map, chip);
+ printk(KERN_ERR "%s: suspend operation failed."
+ "State may be wrong \n", map->name);
+ return -EIO;
+ }
+ chip->erase_suspended = 1;
+ chip->state = FL_READY;
+ return 0;
+ /* Erase suspend */
+ case FL_POINT:
+ /* Only if there's no operation suspended... */
+ if (mode == FL_READY && chip->oldstate == FL_READY)
+ return 0;
+
+ default:
+sleep:
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ add_wait_queue(&chip->wq, &wait);
+ mutex_unlock(&chip->mutex);
+ schedule();
+ remove_wait_queue(&chip->wq, &wait);
+ mutex_lock(&chip->mutex);
+ return -EAGAIN;
+ }
+}
+
+static void put_chip(struct map_info *map, struct flchip *chip)
+{
+ if (chip->priv) {
+ struct flchip_shared *shared = chip->priv;
+ mutex_lock(&shared->lock);
+ if (shared->writing == chip && chip->oldstate == FL_READY) {
+ /* We own the ability to write, but we're done */
+ shared->writing = shared->erasing;
+ if (shared->writing && shared->writing != chip) {
+ /* give back the ownership */
+ struct flchip *loaner = shared->writing;
+ mutex_lock(&loaner->mutex);
+ mutex_unlock(&shared->lock);
+ mutex_unlock(&chip->mutex);
+ put_chip(map, loaner);
+ mutex_lock(&chip->mutex);
+ mutex_unlock(&loaner->mutex);
+ wake_up(&chip->wq);
+ return;
+ }
+ shared->erasing = NULL;
+ shared->writing = NULL;
+ } else if (shared->erasing == chip && shared->writing != chip) {
+ /*
+ * We own the ability to erase without the ability
+ * to write, which means the erase was suspended
+ * and some other partition is currently writing.
+ * Don't let the switch below mess things up since
+ * we don't have ownership to resume anything.
+ */
+ mutex_unlock(&shared->lock);
+ wake_up(&chip->wq);
+ return;
+ }
+ mutex_unlock(&shared->lock);
+ }
+
+ switch (chip->oldstate) {
+ case FL_ERASING:
+ map_write(map, CMD(LPDDR_RESUME),
+ map->pfow_base + PFOW_COMMAND_CODE);
+ map_write(map, CMD(LPDDR_START_EXECUTION),
+ map->pfow_base + PFOW_COMMAND_EXECUTE);
+ chip->oldstate = FL_READY;
+ chip->state = FL_ERASING;
+ break;
+ case FL_READY:
+ break;
+ default:
+ printk(KERN_ERR "%s: put_chip() called with oldstate %d!\n",
+ map->name, chip->oldstate);
+ }
+ wake_up(&chip->wq);
+}
+
+static int do_write_buffer(struct map_info *map, struct flchip *chip,
+ unsigned long adr, const struct kvec **pvec,
+ unsigned long *pvec_seek, int len)
+{
+ struct lpddr_private *lpddr = map->fldrv_priv;
+ map_word datum;
+ int ret, wbufsize, word_gap, words;
+ const struct kvec *vec;
+ unsigned long vec_seek;
+ unsigned long prog_buf_ofs;
+
+ wbufsize = 1 << lpddr->qinfo->BufSizeShift;
+
+ mutex_lock(&chip->mutex);
+ ret = get_chip(map, chip, FL_WRITING);
+ if (ret) {
+ mutex_unlock(&chip->mutex);
+ return ret;
+ }
+ /* Figure out the number of words to write */
+ word_gap = (-adr & (map_bankwidth(map)-1));
+ words = (len - word_gap + map_bankwidth(map) - 1) / map_bankwidth(map);
+ if (!word_gap) {
+ words--;
+ } else {
+ word_gap = map_bankwidth(map) - word_gap;
+ adr -= word_gap;
+ datum = map_word_ff(map);
+ }
+ /* Write data */
+ /* Get the program buffer offset from PFOW register data first*/
+ prog_buf_ofs = map->pfow_base + CMDVAL(map_read(map,
+ map->pfow_base + PFOW_PROGRAM_BUFFER_OFFSET));
+ vec = *pvec;
+ vec_seek = *pvec_seek;
+ do {
+ int n = map_bankwidth(map) - word_gap;
+
+ if (n > vec->iov_len - vec_seek)
+ n = vec->iov_len - vec_seek;
+ if (n > len)
+ n = len;
+
+ if (!word_gap && (len < map_bankwidth(map)))
+ datum = map_word_ff(map);
+
+ datum = map_word_load_partial(map, datum,
+ vec->iov_base + vec_seek, word_gap, n);
+
+ len -= n;
+ word_gap += n;
+ if (!len || word_gap == map_bankwidth(map)) {
+ map_write(map, datum, prog_buf_ofs);
+ prog_buf_ofs += map_bankwidth(map);
+ word_gap = 0;
+ }
+
+ vec_seek += n;
+ if (vec_seek == vec->iov_len) {
+ vec++;
+ vec_seek = 0;
+ }
+ } while (len);
+ *pvec = vec;
+ *pvec_seek = vec_seek;
+
+ /* GO GO GO */
+ send_pfow_command(map, LPDDR_BUFF_PROGRAM, adr, wbufsize, NULL);
+ chip->state = FL_WRITING;
+ ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->ProgBufferTime));
+ if (ret) {
+ printk(KERN_WARNING"%s Buffer program error: %d at %lx; \n",
+ map->name, ret, adr);
+ goto out;
+ }
+
+ out: put_chip(map, chip);
+ mutex_unlock(&chip->mutex);
+ return ret;
+}
+
+static int do_erase_oneblock(struct mtd_info *mtd, loff_t adr)
+{
+ struct map_info *map = mtd->priv;
+ struct lpddr_private *lpddr = map->fldrv_priv;
+ int chipnum = adr >> lpddr->chipshift;
+ struct flchip *chip = &lpddr->chips[chipnum];
+ int ret;
+
+ mutex_lock(&chip->mutex);
+ ret = get_chip(map, chip, FL_ERASING);
+ if (ret) {
+ mutex_unlock(&chip->mutex);
+ return ret;
+ }
+ send_pfow_command(map, LPDDR_BLOCK_ERASE, adr, 0, NULL);
+ chip->state = FL_ERASING;
+ ret = wait_for_ready(map, chip, (1<<lpddr->qinfo->BlockEraseTime)*1000);
+ if (ret) {
+ printk(KERN_WARNING"%s Erase block error %d at : %llx\n",
+ map->name, ret, adr);
+ goto out;
+ }
+ out: put_chip(map, chip);
+ mutex_unlock(&chip->mutex);
+ return ret;
+}
+
+static int lpddr_read(struct mtd_info *mtd, loff_t adr, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ struct map_info *map = mtd->priv;
+ struct lpddr_private *lpddr = map->fldrv_priv;
+ int chipnum = adr >> lpddr->chipshift;
+ struct flchip *chip = &lpddr->chips[chipnum];
+ int ret = 0;
+
+ mutex_lock(&chip->mutex);
+ ret = get_chip(map, chip, FL_READY);
+ if (ret) {
+ mutex_unlock(&chip->mutex);
+ return ret;
+ }
+
+ map_copy_from(map, buf, adr, len);
+ *retlen = len;
+
+ put_chip(map, chip);
+ mutex_unlock(&chip->mutex);
+ return ret;
+}
+
+static int lpddr_point(struct mtd_info *mtd, loff_t adr, size_t len,
+ size_t *retlen, void **mtdbuf, resource_size_t *phys)
+{
+ struct map_info *map = mtd->priv;
+ struct lpddr_private *lpddr = map->fldrv_priv;
+ int chipnum = adr >> lpddr->chipshift;
+ unsigned long ofs, last_end = 0;
+ struct flchip *chip = &lpddr->chips[chipnum];
+ int ret = 0;
+
+ if (!map->virt)
+ return -EINVAL;
+
+ /* ofs: offset within the first chip that the first read should start */
+ ofs = adr - (chipnum << lpddr->chipshift);
+ *mtdbuf = (void *)map->virt + chip->start + ofs;
+
+ while (len) {
+ unsigned long thislen;
+
+ if (chipnum >= lpddr->numchips)
+ break;
+
+ /* We cannot point across chips that are virtually disjoint */
+ if (!last_end)
+ last_end = chip->start;
+ else if (chip->start != last_end)
+ break;
+
+ if ((len + ofs - 1) >> lpddr->chipshift)
+ thislen = (1<<lpddr->chipshift) - ofs;
+ else
+ thislen = len;
+ /* get the chip */
+ mutex_lock(&chip->mutex);
+ ret = get_chip(map, chip, FL_POINT);
+ mutex_unlock(&chip->mutex);
+ if (ret)
+ break;
+
+ chip->state = FL_POINT;
+ chip->ref_point_counter++;
+ *retlen += thislen;
+ len -= thislen;
+
+ ofs = 0;
+ last_end += 1 << lpddr->chipshift;
+ chipnum++;
+ chip = &lpddr->chips[chipnum];
+ }
+ return 0;
+}
+
+static int lpddr_unpoint (struct mtd_info *mtd, loff_t adr, size_t len)
+{
+ struct map_info *map = mtd->priv;
+ struct lpddr_private *lpddr = map->fldrv_priv;
+ int chipnum = adr >> lpddr->chipshift, err = 0;
+ unsigned long ofs;
+
+ /* ofs: offset within the first chip that the first read should start */
+ ofs = adr - (chipnum << lpddr->chipshift);
+
+ while (len) {
+ unsigned long thislen;
+ struct flchip *chip;
+
+ chip = &lpddr->chips[chipnum];
+ if (chipnum >= lpddr->numchips)
+ break;
+
+ if ((len + ofs - 1) >> lpddr->chipshift)
+ thislen = (1<<lpddr->chipshift) - ofs;
+ else
+ thislen = len;
+
+ mutex_lock(&chip->mutex);
+ if (chip->state == FL_POINT) {
+ chip->ref_point_counter--;
+ if (chip->ref_point_counter == 0)
+ chip->state = FL_READY;
+ } else {
+ printk(KERN_WARNING "%s: Warning: unpoint called on non"
+ "pointed region\n", map->name);
+ err = -EINVAL;
+ }
+
+ put_chip(map, chip);
+ mutex_unlock(&chip->mutex);
+
+ len -= thislen;
+ ofs = 0;
+ chipnum++;
+ }
+
+ return err;
+}
+
+static int lpddr_write_buffers(struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf)
+{
+ struct kvec vec;
+
+ vec.iov_base = (void *) buf;
+ vec.iov_len = len;
+
+ return lpddr_writev(mtd, &vec, 1, to, retlen);
+}
+
+
+static int lpddr_writev(struct mtd_info *mtd, const struct kvec *vecs,
+ unsigned long count, loff_t to, size_t *retlen)
+{
+ struct map_info *map = mtd->priv;
+ struct lpddr_private *lpddr = map->fldrv_priv;
+ int ret = 0;
+ int chipnum;
+ unsigned long ofs, vec_seek, i;
+ int wbufsize = 1 << lpddr->qinfo->BufSizeShift;
+ size_t len = 0;
+
+ for (i = 0; i < count; i++)
+ len += vecs[i].iov_len;
+
+ if (!len)
+ return 0;
+
+ chipnum = to >> lpddr->chipshift;
+
+ ofs = to;
+ vec_seek = 0;
+
+ do {
+ /* We must not cross write block boundaries */
+ int size = wbufsize - (ofs & (wbufsize-1));
+
+ if (size > len)
+ size = len;
+
+ ret = do_write_buffer(map, &lpddr->chips[chipnum],
+ ofs, &vecs, &vec_seek, size);
+ if (ret)
+ return ret;
+
+ ofs += size;
+ (*retlen) += size;
+ len -= size;
+
+ /* Be nice and reschedule with the chip in a usable
+ * state for other processes */
+ cond_resched();
+
+ } while (len);
+
+ return 0;
+}
+
+static int lpddr_erase(struct mtd_info *mtd, struct erase_info *instr)
+{
+ unsigned long ofs, len;
+ int ret;
+ struct map_info *map = mtd->priv;
+ struct lpddr_private *lpddr = map->fldrv_priv;
+ int size = 1 << lpddr->qinfo->UniformBlockSizeShift;
+
+ ofs = instr->addr;
+ len = instr->len;
+
+ while (len > 0) {
+ ret = do_erase_oneblock(mtd, ofs);
+ if (ret)
+ return ret;
+ ofs += size;
+ len -= size;
+ }
+ instr->state = MTD_ERASE_DONE;
+ mtd_erase_callback(instr);
+
+ return 0;
+}
+
+#define DO_XXLOCK_LOCK 1
+#define DO_XXLOCK_UNLOCK 2
+static int do_xxlock(struct mtd_info *mtd, loff_t adr, uint32_t len, int thunk)
+{
+ int ret = 0;
+ struct map_info *map = mtd->priv;
+ struct lpddr_private *lpddr = map->fldrv_priv;
+ int chipnum = adr >> lpddr->chipshift;
+ struct flchip *chip = &lpddr->chips[chipnum];
+
+ mutex_lock(&chip->mutex);
+ ret = get_chip(map, chip, FL_LOCKING);
+ if (ret) {
+ mutex_unlock(&chip->mutex);
+ return ret;
+ }
+
+ if (thunk == DO_XXLOCK_LOCK) {
+ send_pfow_command(map, LPDDR_LOCK_BLOCK, adr, adr + len, NULL);
+ chip->state = FL_LOCKING;
+ } else if (thunk == DO_XXLOCK_UNLOCK) {
+ send_pfow_command(map, LPDDR_UNLOCK_BLOCK, adr, adr + len, NULL);
+ chip->state = FL_UNLOCKING;
+ } else
+ BUG();
+
+ ret = wait_for_ready(map, chip, 1);
+ if (ret) {
+ printk(KERN_ERR "%s: block unlock error status %d \n",
+ map->name, ret);
+ goto out;
+ }
+out: put_chip(map, chip);
+ mutex_unlock(&chip->mutex);
+ return ret;
+}
+
+static int lpddr_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
+{
+ return do_xxlock(mtd, ofs, len, DO_XXLOCK_LOCK);
+}
+
+static int lpddr_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
+{
+ return do_xxlock(mtd, ofs, len, DO_XXLOCK_UNLOCK);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Alexey Korolev <akorolev@infradead.org>");
+MODULE_DESCRIPTION("MTD driver for LPDDR flash chips");
diff --git a/drivers/mtd/lpddr/qinfo_probe.c b/drivers/mtd/lpddr/qinfo_probe.c
new file mode 100644
index 000000000..69f211234
--- /dev/null
+++ b/drivers/mtd/lpddr/qinfo_probe.c
@@ -0,0 +1,249 @@
+/*
+ * Probing flash chips with QINFO records.
+ * (C) 2008 Korolev Alexey <akorolev@infradead.org>
+ * (C) 2008 Vasiliy Leonenko <vasiliy.leonenko@gmail.com>
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+
+#include <linux/mtd/xip.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/pfow.h>
+#include <linux/mtd/qinfo.h>
+
+static int lpddr_chip_setup(struct map_info *map, struct lpddr_private *lpddr);
+struct mtd_info *lpddr_probe(struct map_info *map);
+static struct lpddr_private *lpddr_probe_chip(struct map_info *map);
+static int lpddr_pfow_present(struct map_info *map,
+ struct lpddr_private *lpddr);
+
+static struct qinfo_query_info qinfo_array[] = {
+ /* General device info */
+ {0, 0, "DevSizeShift", "Device size 2^n bytes"},
+ {0, 3, "BufSizeShift", "Program buffer size 2^n bytes"},
+ /* Erase block information */
+ {1, 1, "TotalBlocksNum", "Total number of blocks"},
+ {1, 2, "UniformBlockSizeShift", "Uniform block size 2^n bytes"},
+ /* Partition information */
+ {2, 1, "HWPartsNum", "Number of hardware partitions"},
+ /* Optional features */
+ {5, 1, "SuspEraseSupp", "Suspend erase supported"},
+ /* Operation typical time */
+ {10, 0, "SingleWordProgTime", "Single word program 2^n u-sec"},
+ {10, 1, "ProgBufferTime", "Program buffer write 2^n u-sec"},
+ {10, 2, "BlockEraseTime", "Block erase 2^n m-sec"},
+ {10, 3, "FullChipEraseTime", "Full chip erase 2^n m-sec"},
+};
+
+static long lpddr_get_qinforec_pos(struct map_info *map, char *id_str)
+{
+ int qinfo_lines = ARRAY_SIZE(qinfo_array);
+ int i;
+ int bankwidth = map_bankwidth(map) * 8;
+ int major, minor;
+
+ for (i = 0; i < qinfo_lines; i++) {
+ if (strcmp(id_str, qinfo_array[i].id_str) == 0) {
+ major = qinfo_array[i].major & ((1 << bankwidth) - 1);
+ minor = qinfo_array[i].minor & ((1 << bankwidth) - 1);
+ return minor | (major << bankwidth);
+ }
+ }
+ printk(KERN_ERR"%s qinfo id string is wrong! \n", map->name);
+ BUG();
+ return -1;
+}
+
+static uint16_t lpddr_info_query(struct map_info *map, char *id_str)
+{
+ unsigned int dsr, val;
+ int bits_per_chip = map_bankwidth(map) * 8;
+ unsigned long adr = lpddr_get_qinforec_pos(map, id_str);
+ int attempts = 20;
+
+ /* Write a request for the PFOW record */
+ map_write(map, CMD(LPDDR_INFO_QUERY),
+ map->pfow_base + PFOW_COMMAND_CODE);
+ map_write(map, CMD(adr & ((1 << bits_per_chip) - 1)),
+ map->pfow_base + PFOW_COMMAND_ADDRESS_L);
+ map_write(map, CMD(adr >> bits_per_chip),
+ map->pfow_base + PFOW_COMMAND_ADDRESS_H);
+ map_write(map, CMD(LPDDR_START_EXECUTION),
+ map->pfow_base + PFOW_COMMAND_EXECUTE);
+
+ while ((attempts--) > 0) {
+ dsr = CMDVAL(map_read(map, map->pfow_base + PFOW_DSR));
+ if (dsr & DSR_READY_STATUS)
+ break;
+ udelay(10);
+ }
+
+ val = CMDVAL(map_read(map, map->pfow_base + PFOW_COMMAND_DATA));
+ return val;
+}
+
+static int lpddr_pfow_present(struct map_info *map, struct lpddr_private *lpddr)
+{
+ map_word pfow_val[4];
+
+ /* Check identification string */
+ pfow_val[0] = map_read(map, map->pfow_base + PFOW_QUERY_STRING_P);
+ pfow_val[1] = map_read(map, map->pfow_base + PFOW_QUERY_STRING_F);
+ pfow_val[2] = map_read(map, map->pfow_base + PFOW_QUERY_STRING_O);
+ pfow_val[3] = map_read(map, map->pfow_base + PFOW_QUERY_STRING_W);
+
+ if (!map_word_equal(map, CMD('P'), pfow_val[0]))
+ goto out;
+
+ if (!map_word_equal(map, CMD('F'), pfow_val[1]))
+ goto out;
+
+ if (!map_word_equal(map, CMD('O'), pfow_val[2]))
+ goto out;
+
+ if (!map_word_equal(map, CMD('W'), pfow_val[3]))
+ goto out;
+
+ return 1; /* "PFOW" is found */
+out:
+ printk(KERN_WARNING"%s: PFOW string at 0x%lx is not found \n",
+ map->name, map->pfow_base);
+ return 0;
+}
+
+static int lpddr_chip_setup(struct map_info *map, struct lpddr_private *lpddr)
+{
+
+ lpddr->qinfo = kzalloc(sizeof(struct qinfo_chip), GFP_KERNEL);
+ if (!lpddr->qinfo)
+ return 0;
+
+ /* Get the ManuID */
+ lpddr->ManufactId = CMDVAL(map_read(map, map->pfow_base + PFOW_MANUFACTURER_ID));
+ /* Get the DeviceID */
+ lpddr->DevId = CMDVAL(map_read(map, map->pfow_base + PFOW_DEVICE_ID));
+ /* read parameters from chip qinfo table */
+ lpddr->qinfo->DevSizeShift = lpddr_info_query(map, "DevSizeShift");
+ lpddr->qinfo->TotalBlocksNum = lpddr_info_query(map, "TotalBlocksNum");
+ lpddr->qinfo->BufSizeShift = lpddr_info_query(map, "BufSizeShift");
+ lpddr->qinfo->HWPartsNum = lpddr_info_query(map, "HWPartsNum");
+ lpddr->qinfo->UniformBlockSizeShift =
+ lpddr_info_query(map, "UniformBlockSizeShift");
+ lpddr->qinfo->SuspEraseSupp = lpddr_info_query(map, "SuspEraseSupp");
+ lpddr->qinfo->SingleWordProgTime =
+ lpddr_info_query(map, "SingleWordProgTime");
+ lpddr->qinfo->ProgBufferTime = lpddr_info_query(map, "ProgBufferTime");
+ lpddr->qinfo->BlockEraseTime = lpddr_info_query(map, "BlockEraseTime");
+ return 1;
+}
+static struct lpddr_private *lpddr_probe_chip(struct map_info *map)
+{
+ struct lpddr_private lpddr;
+ struct lpddr_private *retlpddr;
+ int numvirtchips;
+
+
+ if ((map->pfow_base + 0x1000) >= map->size) {
+ printk(KERN_NOTICE"%s Probe at base (0x%08lx) past the end of"
+ "the map(0x%08lx)\n", map->name,
+ (unsigned long)map->pfow_base, map->size - 1);
+ return NULL;
+ }
+ memset(&lpddr, 0, sizeof(struct lpddr_private));
+ if (!lpddr_pfow_present(map, &lpddr))
+ return NULL;
+
+ if (!lpddr_chip_setup(map, &lpddr))
+ return NULL;
+
+ /* Ok so we found a chip */
+ lpddr.chipshift = lpddr.qinfo->DevSizeShift;
+ lpddr.numchips = 1;
+
+ numvirtchips = lpddr.numchips * lpddr.qinfo->HWPartsNum;
+ retlpddr = kzalloc(sizeof(struct lpddr_private) +
+ numvirtchips * sizeof(struct flchip), GFP_KERNEL);
+ if (!retlpddr)
+ return NULL;
+
+ memcpy(retlpddr, &lpddr, sizeof(struct lpddr_private));
+
+ retlpddr->numchips = numvirtchips;
+ retlpddr->chipshift = retlpddr->qinfo->DevSizeShift -
+ __ffs(retlpddr->qinfo->HWPartsNum);
+
+ return retlpddr;
+}
+
+struct mtd_info *lpddr_probe(struct map_info *map)
+{
+ struct mtd_info *mtd = NULL;
+ struct lpddr_private *lpddr;
+
+ /* First probe the map to see if we havecan open PFOW here */
+ lpddr = lpddr_probe_chip(map);
+ if (!lpddr)
+ return NULL;
+
+ map->fldrv_priv = lpddr;
+ mtd = lpddr_cmdset(map);
+ if (mtd) {
+ if (mtd->size > map->size) {
+ printk(KERN_WARNING "Reducing visibility of %ldKiB chip"
+ "to %ldKiB\n", (unsigned long)mtd->size >> 10,
+ (unsigned long)map->size >> 10);
+ mtd->size = map->size;
+ }
+ return mtd;
+ }
+
+ kfree(lpddr->qinfo);
+ kfree(lpddr);
+ map->fldrv_priv = NULL;
+ return NULL;
+}
+
+static struct mtd_chip_driver lpddr_chipdrv = {
+ .probe = lpddr_probe,
+ .name = "qinfo_probe",
+ .module = THIS_MODULE
+};
+
+static int __init lpddr_probe_init(void)
+{
+ register_mtd_chip_driver(&lpddr_chipdrv);
+ return 0;
+}
+
+static void __exit lpddr_probe_exit(void)
+{
+ unregister_mtd_chip_driver(&lpddr_chipdrv);
+}
+
+module_init(lpddr_probe_init);
+module_exit(lpddr_probe_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Vasiliy Leonenko <vasiliy.leonenko@gmail.com>");
+MODULE_DESCRIPTION("Driver to probe qinfo flash chips");
+
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-05 22:03:35 +0000