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    Subject[RFC 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)

    Signed-off-by: Aneesh V <aneesh@ti.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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