[U-Boot] [PATCH v7 3/6] spi: cadence_qspi: fix base trigger address & transfer start address

[Vikas Manocha <vikas.manocha@st.com>]

This patch is to separate the base trigger from the read/write transfer start
addresses.

Base trigger register address (0x1c register) corresponds to the address which
should be put on AHB bus to handle indirect transfer triggered before.

To handle indirect transfer we need to issue addresses from (value of 0x1c) to
(value of 0x1c) + 15*4 ("4" corresponds to size of SRAM location).
There are no obstacles in issuing const address just equal to 0x1c. Important
thing to note is that indirect trigger address has nothing in common with your
physical or mapped NOR Flash address.

Transfer read/write start addresses (offset 0x68/0x78)should be programmed with
the absolute flash address to be read/written.

plat->triggerbase is added in device tree for mapped spi flash address.

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
---

Changes in v7: None.
Changes in v6: fixed binding for trigger-address.
Changes in v5: None.
Changes in v4:
- fifo-width & trigger address alligned to linux device tree binding.
- renaming of one parameter moved to separate patch.
- trigger address of socfpga reverted back to 0x0.

 arch/arm/dts/socfpga.dtsi      |    1 +
 arch/arm/dts/stv0991.dts       |    1 +
 drivers/spi/cadence_qspi.c     |    9 +++++----
 drivers/spi/cadence_qspi.h     |    1 +
 drivers/spi/cadence_qspi_apb.c |    7 +++----
 5 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/arch/arm/dts/socfpga.dtsi b/arch/arm/dts/socfpga.dtsi
index 9b12420..9756544 100644
--- a/arch/arm/dts/socfpga.dtsi
+++ b/arch/arm/dts/socfpga.dtsi
@@ -639,6 +639,7 @@
 			ext-decoder = <0>;  /* external decoder */
 			num-cs = <4>;
 			fifo-depth = <128>;
+			cdns,trigger-address = <0x00000000>;
 			sram-size = <128>;
 			bus-num = <2>;
 			status = "disabled";
diff --git a/arch/arm/dts/stv0991.dts b/arch/arm/dts/stv0991.dts
index fa3fd64..6bc5372 100644
--- a/arch/arm/dts/stv0991.dts
+++ b/arch/arm/dts/stv0991.dts
@@ -33,6 +33,7 @@
 				<0x40000000 0x1000000>;
 			clocks = <3750000>;
 			sram-size = <256>;
+			cdns,trigger-address = <0x40000000>;
 			status = "okay";
 
 			flash0: n25q32 at 0 {
diff --git a/drivers/spi/cadence_qspi.c b/drivers/spi/cadence_qspi.c
index 34a0f46..0d1abc8 100644
--- a/drivers/spi/cadence_qspi.c
+++ b/drivers/spi/cadence_qspi.c
@@ -290,6 +290,8 @@ static int cadence_spi_ofdata_to_platdata(struct udevice *bus)
 
 	plat->regbase = (void *)data[0];
 	plat->ahbbase = (void *)data[2];
+	plat->trigger_base = (u32 *)fdtdec_get_addr(blob, node,
+						    "cdns,trigger-address");
 
 	/* Use 500KHz as a suitable default */
 	plat->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency",
@@ -311,10 +313,9 @@ static int cadence_spi_ofdata_to_platdata(struct udevice *bus)
 	plat->tslch_ns = fdtdec_get_int(blob, subnode, "tslch-ns", 20);
 	plat->sram_size = fdtdec_get_int(blob, node, "sram-size", 128);
 
-	debug("%s: regbase=%p ahbbase=%p max-frequency=%d page-size=%d\n",
-	      __func__, plat->regbase, plat->ahbbase, plat->max_hz,
-	      plat->page_size);
-
+	debug("%s: regbase=%p ahbbase=%p trigger_base=%p max-frequency=%d page-size=%d\n",
+	      __func__, plat->regbase, plat->ahbbase, plat->trigger_base,
+	      plat->max_hz, plat->page_size);
 	return 0;
 }
 
diff --git a/drivers/spi/cadence_qspi.h b/drivers/spi/cadence_qspi.h
index 98e57aa..2f1bd92 100644
--- a/drivers/spi/cadence_qspi.h
+++ b/drivers/spi/cadence_qspi.h
@@ -18,6 +18,7 @@ struct cadence_spi_platdata {
 	unsigned int	max_hz;
 	void		*regbase;
 	void		*ahbbase;
+	void		*trigger_base;
 
 	u32		page_size;
 	u32		block_size;
diff --git a/drivers/spi/cadence_qspi_apb.c b/drivers/spi/cadence_qspi_apb.c
index c5b14c5..8156b2b 100644
--- a/drivers/spi/cadence_qspi_apb.c
+++ b/drivers/spi/cadence_qspi_apb.c
@@ -44,7 +44,6 @@
 #define CQSPI_INST_TYPE_QUAD			(2)
 
 #define CQSPI_STIG_DATA_LEN_MAX			(8)
-#define CQSPI_INDIRECTTRIGGER_ADDR_MASK		(0xFFFFF)
 
 #define CQSPI_DUMMY_CLKS_PER_BYTE		(8)
 #define CQSPI_DUMMY_BYTES_MAX			(4)
@@ -281,7 +280,7 @@ static int qpsi_write_sram_fifo_push(struct cadence_spi_platdata *plat,
 				const void *src_addr, unsigned int num_bytes)
 {
 	const void *reg_base = plat->regbase;
-	void *dest_addr = plat->ahbbase;
+	void *dest_addr = plat->trigger_base;
 	unsigned int retry = CQSPI_REG_RETRY;
 	unsigned int sram_level;
 	unsigned int wr_bytes;
@@ -534,7 +533,7 @@ void cadence_qspi_apb_controller_init(struct cadence_spi_platdata *plat)
 
 	/* Indirect mode configurations */
 	writel((plat->sram_size/2), plat->regbase + CQSPI_REG_SRAMPARTITION);
-	writel((u32)plat->ahbbase & CQSPI_INDIRECTTRIGGER_ADDR_MASK,
+	writel((u32)plat->trigger_base,
 	       plat->regbase + CQSPI_REG_INDIRECTTRIGGER);
 
 	/* Disable all interrupts */
@@ -753,7 +752,7 @@ int cadence_qspi_apb_indirect_read_execute(struct cadence_spi_platdata *plat,
 	       plat->regbase + CQSPI_REG_INDIRECTRD);
 
 	if (qspi_read_sram_fifo_poll(plat->regbase, (void *)rxbuf,
-				     (const void *)plat->ahbbase, rxlen))
+				     (const void *)plat->trigger_base, rxlen))
 		goto failrd;
 
 	/* Check flash indirect controller */
-- 
1.7.9.5