memory: omap-gpmc: Introduce GPMC to NAND interface
authorRoger Quadros <rogerq@ti.com>
Wed, 5 Aug 2015 10:58:01 +0000 (13:58 +0300)
committerRoger Quadros <rogerq@ti.com>
Fri, 15 Apr 2016 08:51:34 +0000 (11:51 +0300)
The OMAP GPMC module has certain registers dedicated for NAND
access and some NAND bits mixed with other GPMC functionality.

For the NAND dedicated registers we have the struct gpmc_nand_regs.

The NAND driver needs to access NAND specific bits from the
following non-dedicated registers
- EMPTYWRITEBUFFERSTATUS from GPMC_STATUS

For accessing these bits we introduce the struct gpmc_nand_ops.

Add gpmc_omap_get_nand_ops() that returns the gpmc_nand_ops along
with updating the gpmc_nand_regs. This API will be called by the
OMAP NAND driver to access the necessary bits in GPMC register space.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
drivers/memory/omap-gpmc.c
include/linux/omap-gpmc.h

index 21825dd..0b62afd 100644 (file)
@@ -1118,6 +1118,27 @@ void gpmc_update_nand_reg(struct gpmc_nand_regs *reg, int cs)
        }
 }
 
+static struct gpmc_nand_ops nand_ops;
+
+/**
+ * gpmc_omap_get_nand_ops - Get the GPMC NAND interface
+ * @regs: the GPMC NAND register map exclusive for NAND use.
+ * @cs: GPMC chip select number on which the NAND sits. The
+ *      register map returned will be specific to this chip select.
+ *
+ * Returns NULL on error e.g. invalid cs.
+ */
+struct gpmc_nand_ops *gpmc_omap_get_nand_ops(struct gpmc_nand_regs *reg, int cs)
+{
+       if (cs >= gpmc_cs_num)
+               return NULL;
+
+       gpmc_update_nand_reg(reg, cs);
+
+       return &nand_ops;
+}
+EXPORT_SYMBOL_GPL(gpmc_omap_get_nand_ops);
+
 int gpmc_get_client_irq(unsigned irq_config)
 {
        int i;
index 2dcef1c..dc2ada6 100644 (file)
 #define GPMC_IRQ_FIFOEVENTENABLE       0x01
 #define GPMC_IRQ_COUNT_EVENT           0x02
 
+/**
+ * gpmc_nand_ops - Interface between NAND and GPMC
+ * @nand_write_buffer_empty: get the NAND write buffer empty status.
+ */
+struct gpmc_nand_ops {
+       bool (*nand_writebuffer_empty)(void);
+};
+
+struct gpmc_nand_regs;
+
+#if IS_ENABLED(CONFIG_OMAP_GPMC)
+struct gpmc_nand_ops *gpmc_omap_get_nand_ops(struct gpmc_nand_regs *regs,
+                                            int cs);
+#else
+static inline gpmc_nand_ops *gpmc_omap_get_nand_ops(struct gpmc_nand_regs *regs,
+                                                   int cs)
+{
+       return NULL;
+}
+#endif /* CONFIG_OMAP_GPMC */
+
+/*--------------------------------*/
+
+/* deprecated APIs */
+#if IS_ENABLED(CONFIG_OMAP_GPMC)
+void gpmc_update_nand_reg(struct gpmc_nand_regs *reg, int cs);
+#else
+static inline void gpmc_update_nand_reg(struct gpmc_nand_regs *reg, int cs)
+{
+}
+#endif /* CONFIG_OMAP_GPMC */
+/*--------------------------------*/
+
 extern int gpmc_calc_timings(struct gpmc_timings *gpmc_t,
                             struct gpmc_settings *gpmc_s,
                             struct gpmc_device_timings *dev_t);
 
-struct gpmc_nand_regs;
 struct device_node;
 
-extern void gpmc_update_nand_reg(struct gpmc_nand_regs *reg, int cs);
 extern int gpmc_get_client_irq(unsigned irq_config);
 
 extern unsigned int gpmc_ticks_to_ns(unsigned int ticks);