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Date: Sat, 4 Feb 2012 17:46:11 +0530
From: Aneesh V <aneesh@...com>
To: linux-omap@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
Aneesh V <aneesh@...com>
Subject: [RFC PATCH 8/8] misc: emif: add debugfs entries for emif
Add debug entries for:
1. calculated registers per frequency
2. last polled value of MR4(temperature level
of LPDDR2 memory)
Signed-off-by: Aneesh V <aneesh@...com>
---
drivers/misc/emif.c | 129 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 129 insertions(+), 0 deletions(-)
diff --git a/drivers/misc/emif.c b/drivers/misc/emif.c
index 9d24cc7..f67a9e7 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/spinlock.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;
@@ -59,11 +61,136 @@ 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;
static u32 t_ck; /* DDR clock period in ps */
+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
*/
@@ -1114,6 +1241,7 @@ static int __init emif_probe(struct platform_device *pdev)
disable_and_clear_all_interrupts(emif);
emif_onetime_settings(emif);
+ emif_debugfs_init(emif);
dev_info(&pdev->dev, "Device configured with addr = %p and IRQ%d\n",
emif->base, emif->irq);
@@ -1129,6 +1257,7 @@ static int __exit emif_remove(struct platform_device *pdev)
{
struct emif_data *emif = platform_get_drvdata(pdev);
+ emif_debugfs_exit(emif);
cleanup_emif(emif);
return 0;
--
1.7.1
--
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