[PATCH v4 3/4] soc: xilinx: vcu: use vcu-settings syscon registers
Michael Tretter
m.tretter at pengutronix.de
Mon Nov 9 08:48:17 EST 2020
Switch the "logicoreip" registers to the new xlnx,vcu-settings binding
to be able to read the settings if the settings are specified in a
separate device tree node that is shared with other drivers.
If the driver is not able to find a node with the new binding, fall back
to check for the logicore register bank to be backwards compatible.
Signed-off-by: Michael Tretter <m.tretter at pengutronix.de>
---
drivers/soc/xilinx/Kconfig | 1 +
drivers/soc/xilinx/xlnx_vcu.c | 94 ++++++++++++++---------------
include/linux/mfd/syscon/xlnx-vcu.h | 38 ++++++++++++
3 files changed, 86 insertions(+), 47 deletions(-)
create mode 100644 include/linux/mfd/syscon/xlnx-vcu.h
diff --git a/drivers/soc/xilinx/Kconfig b/drivers/soc/xilinx/Kconfig
index 646512d7276f..0b1708dae361 100644
--- a/drivers/soc/xilinx/Kconfig
+++ b/drivers/soc/xilinx/Kconfig
@@ -4,6 +4,7 @@ menu "Xilinx SoC drivers"
config XILINX_VCU
tristate "Xilinx VCU logicoreIP Init"
depends on HAS_IOMEM
+ select REGMAP_MMIO
help
Provides the driver to enable and disable the isolation between the
processing system and programmable logic part by using the logicoreIP
diff --git a/drivers/soc/xilinx/xlnx_vcu.c b/drivers/soc/xilinx/xlnx_vcu.c
index dcd8e7824b06..14daad4efc58 100644
--- a/drivers/soc/xilinx/xlnx_vcu.c
+++ b/drivers/soc/xilinx/xlnx_vcu.c
@@ -10,39 +10,12 @@
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/mfd/syscon/xlnx-vcu.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
-
-/* Address map for different registers implemented in the VCU LogiCORE IP. */
-#define VCU_ECODER_ENABLE 0x00
-#define VCU_DECODER_ENABLE 0x04
-#define VCU_MEMORY_DEPTH 0x08
-#define VCU_ENC_COLOR_DEPTH 0x0c
-#define VCU_ENC_VERTICAL_RANGE 0x10
-#define VCU_ENC_FRAME_SIZE_X 0x14
-#define VCU_ENC_FRAME_SIZE_Y 0x18
-#define VCU_ENC_COLOR_FORMAT 0x1c
-#define VCU_ENC_FPS 0x20
-#define VCU_MCU_CLK 0x24
-#define VCU_CORE_CLK 0x28
-#define VCU_PLL_BYPASS 0x2c
-#define VCU_ENC_CLK 0x30
-#define VCU_PLL_CLK 0x34
-#define VCU_ENC_VIDEO_STANDARD 0x38
-#define VCU_STATUS 0x3c
-#define VCU_AXI_ENC_CLK 0x40
-#define VCU_AXI_DEC_CLK 0x44
-#define VCU_AXI_MCU_CLK 0x48
-#define VCU_DEC_VIDEO_STANDARD 0x4c
-#define VCU_DEC_FRAME_SIZE_X 0x50
-#define VCU_DEC_FRAME_SIZE_Y 0x54
-#define VCU_DEC_FPS 0x58
-#define VCU_BUFFER_B_FRAME 0x5c
-#define VCU_WPP_EN 0x60
-#define VCU_PLL_CLK_DEC 0x64
-#define VCU_GASKET_INIT 0x74
-#define VCU_GASKET_VALUE 0x03
+#include <linux/regmap.h>
/* vcu slcr registers, bitmask and shift */
#define VCU_PLL_CTRL 0x24
@@ -106,11 +79,20 @@ struct xvcu_device {
struct device *dev;
struct clk *pll_ref;
struct clk *aclk;
- void __iomem *logicore_reg_ba;
+ struct regmap *logicore_reg_ba;
void __iomem *vcu_slcr_ba;
u32 coreclk;
};
+static struct regmap_config vcu_settings_regmap_config = {
+ .name = "regmap",
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = 0xfff,
+ .cache_type = REGCACHE_NONE,
+};
+
/**
* struct xvcu_pll_cfg - Helper data
* @fbdiv: The integer portion of the feedback divider to the PLL
@@ -300,10 +282,12 @@ static int xvcu_set_vcu_pll_info(struct xvcu_device *xvcu)
int ret, i;
const struct xvcu_pll_cfg *found = NULL;
- inte = xvcu_read(xvcu->logicore_reg_ba, VCU_PLL_CLK);
- deci = xvcu_read(xvcu->logicore_reg_ba, VCU_PLL_CLK_DEC);
- coreclk = xvcu_read(xvcu->logicore_reg_ba, VCU_CORE_CLK) * MHZ;
- mcuclk = xvcu_read(xvcu->logicore_reg_ba, VCU_MCU_CLK) * MHZ;
+ regmap_read(xvcu->logicore_reg_ba, VCU_PLL_CLK, &inte);
+ regmap_read(xvcu->logicore_reg_ba, VCU_PLL_CLK_DEC, &deci);
+ regmap_read(xvcu->logicore_reg_ba, VCU_CORE_CLK, &coreclk);
+ coreclk *= MHZ;
+ regmap_read(xvcu->logicore_reg_ba, VCU_MCU_CLK, &mcuclk);
+ mcuclk *= MHZ;
if (!mcuclk || !coreclk) {
dev_err(xvcu->dev, "Invalid mcu and core clock data\n");
return -EINVAL;
@@ -498,6 +482,7 @@ static int xvcu_probe(struct platform_device *pdev)
{
struct resource *res;
struct xvcu_device *xvcu;
+ void __iomem *regs;
int ret;
xvcu = devm_kzalloc(&pdev->dev, sizeof(*xvcu), GFP_KERNEL);
@@ -518,17 +503,32 @@ static int xvcu_probe(struct platform_device *pdev)
return -ENOMEM;
}
- res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "logicore");
- if (!res) {
- dev_err(&pdev->dev, "get logicore memory resource failed.\n");
- return -ENODEV;
- }
+ xvcu->logicore_reg_ba =
+ syscon_regmap_lookup_by_compatible("xlnx,vcu-settings");
+ if (IS_ERR(xvcu->logicore_reg_ba)) {
+ dev_info(&pdev->dev,
+ "could not find xlnx,vcu-settings: trying direct register access\n");
+
+ res = platform_get_resource_byname(pdev,
+ IORESOURCE_MEM, "logicore");
+ if (!res) {
+ dev_err(&pdev->dev, "get logicore memory resource failed.\n");
+ return -ENODEV;
+ }
- xvcu->logicore_reg_ba = devm_ioremap(&pdev->dev, res->start,
- resource_size(res));
- if (!xvcu->logicore_reg_ba) {
- dev_err(&pdev->dev, "logicore register mapping failed.\n");
- return -ENOMEM;
+ regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+ if (!regs) {
+ dev_err(&pdev->dev, "logicore register mapping failed.\n");
+ return -ENOMEM;
+ }
+
+ xvcu->logicore_reg_ba =
+ devm_regmap_init_mmio(&pdev->dev, regs,
+ &vcu_settings_regmap_config);
+ if (IS_ERR(xvcu->logicore_reg_ba)) {
+ dev_err(&pdev->dev, "failed to init regmap\n");
+ return PTR_ERR(xvcu->logicore_reg_ba);
+ }
}
xvcu->aclk = devm_clk_get(&pdev->dev, "aclk");
@@ -560,7 +560,7 @@ static int xvcu_probe(struct platform_device *pdev)
* Bit 0 : Gasket isolation
* Bit 1 : put VCU out of reset
*/
- xvcu_write(xvcu->logicore_reg_ba, VCU_GASKET_INIT, VCU_GASKET_VALUE);
+ regmap_write(xvcu->logicore_reg_ba, VCU_GASKET_INIT, VCU_GASKET_VALUE);
/* Do the PLL Settings based on the ref clk,core and mcu clk freq */
ret = xvcu_set_pll(xvcu);
@@ -597,7 +597,7 @@ static int xvcu_remove(struct platform_device *pdev)
return -ENODEV;
/* Add the the Gasket isolation and put the VCU in reset. */
- xvcu_write(xvcu->logicore_reg_ba, VCU_GASKET_INIT, 0);
+ regmap_write(xvcu->logicore_reg_ba, VCU_GASKET_INIT, 0);
clk_disable_unprepare(xvcu->pll_ref);
clk_disable_unprepare(xvcu->aclk);
diff --git a/include/linux/mfd/syscon/xlnx-vcu.h b/include/linux/mfd/syscon/xlnx-vcu.h
new file mode 100644
index 000000000000..d3edec4b7b1d
--- /dev/null
+++ b/include/linux/mfd/syscon/xlnx-vcu.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2020 Pengutronix, Michael Tretter <kernel at pengutronix.de>
+ */
+
+#ifndef __XLNX_VCU_H
+#define __XLNX_VCU_H
+
+#define VCU_ECODER_ENABLE 0x00
+#define VCU_DECODER_ENABLE 0x04
+#define VCU_MEMORY_DEPTH 0x08
+#define VCU_ENC_COLOR_DEPTH 0x0c
+#define VCU_ENC_VERTICAL_RANGE 0x10
+#define VCU_ENC_FRAME_SIZE_X 0x14
+#define VCU_ENC_FRAME_SIZE_Y 0x18
+#define VCU_ENC_COLOR_FORMAT 0x1c
+#define VCU_ENC_FPS 0x20
+#define VCU_MCU_CLK 0x24
+#define VCU_CORE_CLK 0x28
+#define VCU_PLL_BYPASS 0x2c
+#define VCU_ENC_CLK 0x30
+#define VCU_PLL_CLK 0x34
+#define VCU_ENC_VIDEO_STANDARD 0x38
+#define VCU_STATUS 0x3c
+#define VCU_AXI_ENC_CLK 0x40
+#define VCU_AXI_DEC_CLK 0x44
+#define VCU_AXI_MCU_CLK 0x48
+#define VCU_DEC_VIDEO_STANDARD 0x4c
+#define VCU_DEC_FRAME_SIZE_X 0x50
+#define VCU_DEC_FRAME_SIZE_Y 0x54
+#define VCU_DEC_FPS 0x58
+#define VCU_BUFFER_B_FRAME 0x5c
+#define VCU_WPP_EN 0x60
+#define VCU_PLL_CLK_DEC 0x64
+#define VCU_GASKET_INIT 0x74
+#define VCU_GASKET_VALUE 0x03
+
+#endif /* __XLNX_VCU_H */
--
2.20.1
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