From: avinash philip avinashphi...@ti.com
ELM is used for locating bit-flip errors in when using BCH ECC scheme.
This patch adds suspend/resume support for leaf level ELM driver,
And also provides ELM register context save restore support, so that
configurations are preserved across hardware power-off/on transitions.
Signed-off-by: Philip Avinash avinashphi...@ti.com
Signed-off-by: Pekon Gupta pe...@ti.com
---
drivers/mtd/devices/elm.c | 117 ++
1 file changed, 117 insertions(+)
diff --git a/drivers/mtd/devices/elm.c b/drivers/mtd/devices/elm.c
index dccef9f..e6a7b89 100644
--- a/drivers/mtd/devices/elm.c
+++ b/drivers/mtd/devices/elm.c
@@ -20,14 +20,21 @@
#include linux/interrupt.h
#include linux/io.h
#include linux/of.h
+#include linux/sched.h
#include linux/pm_runtime.h
#include linux/platform_data/elm.h
+#define ELM_SYSCONFIG 0x010
#define ELM_IRQSTATUS 0x018
#define ELM_IRQENABLE 0x01c
#define ELM_LOCATION_CONFIG0x020
#define ELM_PAGE_CTRL 0x080
#define ELM_SYNDROME_FRAGMENT_00x400
+#define ELM_SYNDROME_FRAGMENT_10x404
+#define ELM_SYNDROME_FRAGMENT_20x408
+#define ELM_SYNDROME_FRAGMENT_30x40c
+#define ELM_SYNDROME_FRAGMENT_40x410
+#define ELM_SYNDROME_FRAGMENT_50x414
#define ELM_SYNDROME_FRAGMENT_60x418
#define ELM_LOCATION_STATUS0x800
#define ELM_ERROR_LOCATION_0 0x880
@@ -56,12 +63,27 @@
#define SYNDROME_FRAGMENT_REG_SIZE 0x40
#define ERROR_LOCATION_SIZE0x100
+struct elm_registers {
+ u32 elm_irqenable;
+ u32 elm_sysconfig;
+ u32 elm_location_config;
+ u32 elm_page_ctrl;
+ u32 elm_syndrome_fragment_6[ERROR_VECTOR_MAX];
+ u32 elm_syndrome_fragment_5[ERROR_VECTOR_MAX];
+ u32 elm_syndrome_fragment_4[ERROR_VECTOR_MAX];
+ u32 elm_syndrome_fragment_3[ERROR_VECTOR_MAX];
+ u32 elm_syndrome_fragment_2[ERROR_VECTOR_MAX];
+ u32 elm_syndrome_fragment_1[ERROR_VECTOR_MAX];
+ u32 elm_syndrome_fragment_0[ERROR_VECTOR_MAX];
+};
+
struct elm_info {
struct device *dev;
void __iomem *elm_base;
struct completion elm_completion;
struct list_head list;
enum bch_ecc bch_type;
+ struct elm_registers elm_regs;
};
static LIST_HEAD(elm_devices);
@@ -385,6 +407,100 @@ static int elm_remove(struct platform_device *pdev)
return 0;
}
+/**
+ * elm_context_save
+ * saves ELM configurations to preserve them across Hardware powered-down
+ */
+static int elm_context_save(struct elm_info *info)
+{
+ struct elm_registers *regs = info-elm_regs;
+ enum bch_ecc bch_type = info-bch_type;
+ u32 offset = 0, i;
+
+ regs-elm_irqenable = elm_read_reg(info, ELM_IRQENABLE);
+ regs-elm_sysconfig = elm_read_reg(info, ELM_SYSCONFIG);
+ regs-elm_location_config = elm_read_reg(info, ELM_LOCATION_CONFIG);
+ regs-elm_page_ctrl = elm_read_reg(info, ELM_PAGE_CTRL);
+ for (i = 0; i ERROR_VECTOR_MAX; i++) {
+ offset = i * SYNDROME_FRAGMENT_REG_SIZE;
+ switch (bch_type) {
+ case BCH8_ECC:
+ regs-elm_syndrome_fragment_3[i] = elm_read_reg(info,
+ ELM_SYNDROME_FRAGMENT_3 + offset);
+ regs-elm_syndrome_fragment_2[i] = elm_read_reg(info,
+ ELM_SYNDROME_FRAGMENT_2 + offset);
+ case BCH4_ECC:
+ regs-elm_syndrome_fragment_1[i] = elm_read_reg(info,
+ ELM_SYNDROME_FRAGMENT_1 + offset);
+ regs-elm_syndrome_fragment_0[i] = elm_read_reg(info,
+ ELM_SYNDROME_FRAGMENT_0 + offset);
+ default:
+ return -EINVAL;
+ }
+ /* ELM SYNDROME_VALID bit in SYNDROME_FRAGMENT_6[] needs
+* to be saved for all BCH schemes*/
+ regs-elm_syndrome_fragment_6[i] = elm_read_reg(info,
+ ELM_SYNDROME_FRAGMENT_6 + offset);
+ }
+ return 0;
+}
+
+/**
+ * elm_context_restore
+ * writes configurations saved duing power-down back into ELM registers
+ */
+static int elm_context_restore(struct elm_info *info)
+{
+ struct elm_registers *regs = info-elm_regs;
+ enum bch_ecc bch_type = info-bch_type;
+ u32 offset = 0, i;
+
+ elm_write_reg(info, ELM_IRQENABLE, regs-elm_irqenable);
+ elm_write_reg(info, ELM_SYSCONFIG, regs-elm_sysconfig);
+ elm_write_reg(info, ELM_LOCATION_CONFIG, regs-elm_location_config);
+ elm_write_reg(info, ELM_PAGE_CTRL, regs-elm_page_ctrl);
+ for (i = 0; i ERROR_VECTOR_MAX; i++) {
+ offset =
