diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/memory/emif.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/drivers/memory/emif.c b/drivers/memory/emif.c index 3dfffbb8ab40..33a4396b24cb 100644 --- a/drivers/memory/emif.c +++ b/drivers/memory/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/1000000); + + 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_or_module 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 */ @@ -1175,6 +1302,7 @@ static int __init_or_module emif_probe(struct platform_device *pdev) } emif_onetime_settings(emif); + emif_debugfs_init(emif); disable_and_clear_all_interrupts(emif); setup_interrupts(emif, irq); @@ -1198,6 +1326,15 @@ 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); @@ -1508,6 +1645,7 @@ 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", |