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Subject[PATCH 8/8] misc: emif: add debugfs entries for emif
Date
Add debug entries for:
1. calculated registers per frequency
2. last polled value of MR4(temperature level
of LPDDR2 memory)

Cc: Greg KH <greg@kroah.com>
Signed-off-by: Aneesh V <aneesh@ti.com>
---
Changes since RFC:
- None
---
drivers/misc/emif.c | 138 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 138 insertions(+), 0 deletions(-)
diff --git a/drivers/misc/emif.c b/drivers/misc/emif.c
index da79dd6..79fb161 100644
--- a/drivers/misc/emif.c
+++ b/drivers/misc/emif.c
@@ -18,6 +18,7 @@
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
+#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/module.h>
#include <linux/list.h>
@@ -47,6 +48,7 @@
* frequency change (i.e. corresponding to the
* frequency in effect at the moment)
* @plat_data: Pointer to saved platform data.
+ * @debugfs_root: dentry to the root folder for EMIF in debugfs
*/
struct emif_data {
u8 duplicate;
@@ -60,6 +62,7 @@ struct emif_data {
struct emif_regs *regs_cache[EMIF_MAX_NUM_FREQUENCIES];
struct emif_regs *curr_regs;
struct emif_platform_data *plat_data;
+ struct dentry *debugfs_root;
};

static struct emif_data *emif1;
@@ -68,6 +71,130 @@ static unsigned long irq_state;
static u32 t_ck; /* DDR clock period in ps */
static LIST_HEAD(device_list);

+static void do_emif_regdump_show(struct seq_file *s, struct emif_data *emif,
+ struct emif_regs *regs)
+{
+ u32 type = emif->plat_data->device_info->type;
+ u32 ip_rev = emif->plat_data->ip_rev;
+
+ seq_printf(s, "EMIF register cache dump for %dMHz\n",
+ regs->freq/100000);
+
+ seq_printf(s, "ref_ctrl_shdw\t: 0x%08x\n", regs->ref_ctrl_shdw);
+ seq_printf(s, "sdram_tim1_shdw\t: 0x%08x\n", regs->sdram_tim1_shdw);
+ seq_printf(s, "sdram_tim2_shdw\t: 0x%08x\n", regs->sdram_tim2_shdw);
+ seq_printf(s, "sdram_tim3_shdw\t: 0x%08x\n", regs->sdram_tim3_shdw);
+
+ if (ip_rev == EMIF_4D) {
+ seq_printf(s, "read_idle_ctrl_shdw_normal\t: 0x%08x\n",
+ regs->read_idle_ctrl_shdw_normal);
+ seq_printf(s, "read_idle_ctrl_shdw_volt_ramp\t: 0x%08x\n",
+ regs->read_idle_ctrl_shdw_volt_ramp);
+ } else if (ip_rev == EMIF_4D5) {
+ seq_printf(s, "dll_calib_ctrl_shdw_normal\t: 0x%08x\n",
+ regs->dll_calib_ctrl_shdw_normal);
+ seq_printf(s, "dll_calib_ctrl_shdw_volt_ramp\t: 0x%08x\n",
+ regs->dll_calib_ctrl_shdw_volt_ramp);
+ }
+
+ if (type == DDR_TYPE_LPDDR2_S2 || type == DDR_TYPE_LPDDR2_S4) {
+ seq_printf(s, "ref_ctrl_shdw_derated\t: 0x%08x\n",
+ regs->ref_ctrl_shdw_derated);
+ seq_printf(s, "sdram_tim1_shdw_derated\t: 0x%08x\n",
+ regs->sdram_tim1_shdw_derated);
+ seq_printf(s, "sdram_tim3_shdw_derated\t: 0x%08x\n",
+ regs->sdram_tim3_shdw_derated);
+ }
+}
+
+static int emif_regdump_show(struct seq_file *s, void *unused)
+{
+ struct emif_data *emif = s->private;
+ struct emif_regs **regs_cache;
+ int i;
+
+ if (emif->duplicate)
+ regs_cache = emif1->regs_cache;
+ else
+ regs_cache = emif->regs_cache;
+
+ for (i = 0; i < EMIF_MAX_NUM_FREQUENCIES && regs_cache[i]; i++) {
+ do_emif_regdump_show(s, emif, regs_cache[i]);
+ seq_printf(s, "\n");
+ }
+
+ return 0;
+}
+
+static int emif_regdump_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, emif_regdump_show, inode->i_private);
+}
+
+static const struct file_operations emif_regdump_fops = {
+ .open = emif_regdump_open,
+ .read = seq_read,
+ .release = single_release,
+};
+
+static int emif_mr4_show(struct seq_file *s, void *unused)
+{
+ struct emif_data *emif = s->private;
+
+ seq_printf(s, "MR4=%d\n", emif->temperature_level);
+ return 0;
+}
+
+static int emif_mr4_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, emif_mr4_show, inode->i_private);
+}
+
+static const struct file_operations emif_mr4_fops = {
+ .open = emif_mr4_open,
+ .read = seq_read,
+ .release = single_release,
+};
+
+static int __init emif_debugfs_init(struct emif_data *emif)
+{
+ struct dentry *dentry;
+ int ret;
+
+ dentry = debugfs_create_dir(dev_name(emif->dev), NULL);
+ if (IS_ERR(dentry)) {
+ ret = PTR_ERR(dentry);
+ goto err0;
+ }
+ emif->debugfs_root = dentry;
+
+ dentry = debugfs_create_file("regcache_dump", S_IRUGO,
+ emif->debugfs_root, emif, &emif_regdump_fops);
+ if (IS_ERR(dentry)) {
+ ret = PTR_ERR(dentry);
+ goto err1;
+ }
+
+ dentry = debugfs_create_file("mr4", S_IRUGO,
+ emif->debugfs_root, emif, &emif_mr4_fops);
+ if (IS_ERR(dentry)) {
+ ret = PTR_ERR(dentry);
+ goto err1;
+ }
+
+ return 0;
+err1:
+ debugfs_remove_recursive(emif->debugfs_root);
+err0:
+ return ret;
+}
+
+static void __exit emif_debugfs_exit(struct emif_data *emif)
+{
+ debugfs_remove_recursive(emif->debugfs_root);
+ emif->debugfs_root = NULL;
+}
+
/*
* Calculate the period of DDR clock from frequency value
*/
@@ -1174,6 +1301,7 @@ static int __init emif_probe(struct platform_device *pdev)
}

emif_onetime_settings(emif);
+ emif_debugfs_init(emif);
disable_and_clear_all_interrupts(emif);
setup_interrupts(emif, irq);

@@ -1197,6 +1325,15 @@ error:
return -ENODEV;
}

+static int __exit emif_remove(struct platform_device *pdev)
+{
+ struct emif_data *emif = platform_get_drvdata(pdev);
+
+ emif_debugfs_exit(emif);
+
+ return 0;
+}
+
static void emif_shutdown(struct platform_device *pdev)
{
struct emif_data *emif = platform_get_drvdata(pdev);
@@ -1507,6 +1644,7 @@ static void __attribute__((unused)) freq_post_notify_handling(void)
}

static struct platform_driver emif_driver = {
+ .remove = __exit_p(emif_remove),
.shutdown = emif_shutdown,
.driver = {
.name = "emif",
--
1.7.1


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