memory: 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@ti.com> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Reviewed-by: Benoit Cousson <b-cousson@ti.com> [santosh.shilimkar@ti.com: Moved to drivers/memory from drivers/misc] Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Tested-by: Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aneesh V
Greg Kroah-Hartman
parent
98231c4fc3
commit
aac10aaa8c
1 changed files with 138 additions and 0 deletions
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@ -18,6 +18,7 @@
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/module.h>
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#include <linux/list.h>
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@ -47,6 +48,7 @@
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* frequency change (i.e. corresponding to the
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* frequency in effect at the moment)
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* @plat_data: Pointer to saved platform data.
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* @debugfs_root: dentry to the root folder for EMIF in debugfs
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*/
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struct emif_data {
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u8 duplicate;
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@ -60,6 +62,7 @@ struct emif_data {
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struct emif_regs *regs_cache[EMIF_MAX_NUM_FREQUENCIES];
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struct emif_regs *curr_regs;
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struct emif_platform_data *plat_data;
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struct dentry *debugfs_root;
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};
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static struct emif_data *emif1;
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@ -68,6 +71,130 @@ static unsigned long irq_state;
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static u32 t_ck; /* DDR clock period in ps */
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static LIST_HEAD(device_list);
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static void do_emif_regdump_show(struct seq_file *s, struct emif_data *emif,
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struct emif_regs *regs)
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{
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u32 type = emif->plat_data->device_info->type;
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u32 ip_rev = emif->plat_data->ip_rev;
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seq_printf(s, "EMIF register cache dump for %dMHz\n",
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regs->freq/1000000);
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seq_printf(s, "ref_ctrl_shdw\t: 0x%08x\n", regs->ref_ctrl_shdw);
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seq_printf(s, "sdram_tim1_shdw\t: 0x%08x\n", regs->sdram_tim1_shdw);
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seq_printf(s, "sdram_tim2_shdw\t: 0x%08x\n", regs->sdram_tim2_shdw);
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seq_printf(s, "sdram_tim3_shdw\t: 0x%08x\n", regs->sdram_tim3_shdw);
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if (ip_rev == EMIF_4D) {
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seq_printf(s, "read_idle_ctrl_shdw_normal\t: 0x%08x\n",
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regs->read_idle_ctrl_shdw_normal);
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seq_printf(s, "read_idle_ctrl_shdw_volt_ramp\t: 0x%08x\n",
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regs->read_idle_ctrl_shdw_volt_ramp);
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} else if (ip_rev == EMIF_4D5) {
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seq_printf(s, "dll_calib_ctrl_shdw_normal\t: 0x%08x\n",
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regs->dll_calib_ctrl_shdw_normal);
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seq_printf(s, "dll_calib_ctrl_shdw_volt_ramp\t: 0x%08x\n",
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regs->dll_calib_ctrl_shdw_volt_ramp);
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}
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if (type == DDR_TYPE_LPDDR2_S2 || type == DDR_TYPE_LPDDR2_S4) {
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seq_printf(s, "ref_ctrl_shdw_derated\t: 0x%08x\n",
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regs->ref_ctrl_shdw_derated);
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seq_printf(s, "sdram_tim1_shdw_derated\t: 0x%08x\n",
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regs->sdram_tim1_shdw_derated);
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seq_printf(s, "sdram_tim3_shdw_derated\t: 0x%08x\n",
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regs->sdram_tim3_shdw_derated);
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}
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}
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static int emif_regdump_show(struct seq_file *s, void *unused)
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{
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struct emif_data *emif = s->private;
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struct emif_regs **regs_cache;
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int i;
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if (emif->duplicate)
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regs_cache = emif1->regs_cache;
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else
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regs_cache = emif->regs_cache;
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for (i = 0; i < EMIF_MAX_NUM_FREQUENCIES && regs_cache[i]; i++) {
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do_emif_regdump_show(s, emif, regs_cache[i]);
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seq_printf(s, "\n");
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}
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return 0;
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}
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static int emif_regdump_open(struct inode *inode, struct file *file)
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{
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return single_open(file, emif_regdump_show, inode->i_private);
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}
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static const struct file_operations emif_regdump_fops = {
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.open = emif_regdump_open,
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.read = seq_read,
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.release = single_release,
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};
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static int emif_mr4_show(struct seq_file *s, void *unused)
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{
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struct emif_data *emif = s->private;
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seq_printf(s, "MR4=%d\n", emif->temperature_level);
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return 0;
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}
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static int emif_mr4_open(struct inode *inode, struct file *file)
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{
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return single_open(file, emif_mr4_show, inode->i_private);
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}
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static const struct file_operations emif_mr4_fops = {
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.open = emif_mr4_open,
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.read = seq_read,
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.release = single_release,
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};
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static int __init_or_module emif_debugfs_init(struct emif_data *emif)
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{
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struct dentry *dentry;
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int ret;
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dentry = debugfs_create_dir(dev_name(emif->dev), NULL);
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if (IS_ERR(dentry)) {
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ret = PTR_ERR(dentry);
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goto err0;
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}
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emif->debugfs_root = dentry;
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dentry = debugfs_create_file("regcache_dump", S_IRUGO,
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emif->debugfs_root, emif, &emif_regdump_fops);
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if (IS_ERR(dentry)) {
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ret = PTR_ERR(dentry);
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goto err1;
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}
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dentry = debugfs_create_file("mr4", S_IRUGO,
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emif->debugfs_root, emif, &emif_mr4_fops);
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if (IS_ERR(dentry)) {
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ret = PTR_ERR(dentry);
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goto err1;
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}
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return 0;
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err1:
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debugfs_remove_recursive(emif->debugfs_root);
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err0:
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return ret;
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}
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static void __exit emif_debugfs_exit(struct emif_data *emif)
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{
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debugfs_remove_recursive(emif->debugfs_root);
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emif->debugfs_root = NULL;
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}
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/*
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* Calculate the period of DDR clock from frequency value
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*/
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@ -1175,6 +1302,7 @@ static int __init_or_module emif_probe(struct platform_device *pdev)
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}
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emif_onetime_settings(emif);
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emif_debugfs_init(emif);
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disable_and_clear_all_interrupts(emif);
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setup_interrupts(emif, irq);
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@ -1198,6 +1326,15 @@ static int __init_or_module emif_probe(struct platform_device *pdev)
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return -ENODEV;
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}
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static int __exit emif_remove(struct platform_device *pdev)
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{
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struct emif_data *emif = platform_get_drvdata(pdev);
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emif_debugfs_exit(emif);
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return 0;
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}
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static void emif_shutdown(struct platform_device *pdev)
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{
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struct emif_data *emif = platform_get_drvdata(pdev);
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@ -1508,6 +1645,7 @@ static void __attribute__((unused)) freq_post_notify_handling(void)
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}
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static struct platform_driver emif_driver = {
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.remove = __exit_p(emif_remove),
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.shutdown = emif_shutdown,
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.driver = {
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.name = "emif",
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