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authorRoger Quadros <rogerq@ti.com>2015-08-05 13:58:01 +0300
committerRoger Quadros <rogerq@ti.com>2016-04-15 11:51:34 +0300
commitf47fcad63f6847ea677c6c7030f30fd6438e0052 (patch)
tree756f2115f570e1c35a47f4e254d0196bc220ec0e /include/linux/omap-gpmc.h
parentfabe7d7756d17f5da4bd80fa2373c4bd93ed39e5 (diff)
downloadlinux-f47fcad63f6847ea677c6c7030f30fd6438e0052.tar.xz
memory: omap-gpmc: Introduce GPMC to NAND interface
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>
Diffstat (limited to 'include/linux/omap-gpmc.h')
-rw-r--r--include/linux/omap-gpmc.h35
1 files changed, 33 insertions, 2 deletions
diff --git a/include/linux/omap-gpmc.h b/include/linux/omap-gpmc.h
index 2dcef1c8c8d4..dc2ada6fb9b4 100644
--- a/include/linux/omap-gpmc.h
+++ b/include/linux/omap-gpmc.h
@@ -14,14 +14,45 @@
#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);