[PATCH v1 3/7] mfd: add atmel-lcdc driver
Sam Ravnborg
sam at ravnborg.org
Sun Aug 12 18:46:25 UTC 2018
The LCDC IP used by some Atmel SOC's have a
multifunction device that include two sub-devices:
- pwm
- display controller
This mfd device provide a regmap that can be used by the
sub-devices to safely access the registers.
The mfd device also support the clock used by the
LCDC IP + a bus clock that in some cases are required.
The driver is based on the atmel-hlcdc driver.
The Atmel SOC's are at91sam9261, at91sam9263 etc.
Signed-off-by: Sam Ravnborg <sam at ravnborg.org>
Cc: Lee Jones <lee.jones at linaro.org>
Cc: Boris Brezillon <boris.brezillon at free-electrons.com>
---
drivers/mfd/Kconfig | 10 +++
drivers/mfd/Makefile | 1 +
drivers/mfd/atmel-lcdc.c | 158 +++++++++++++++++++++++++++++++++++
include/linux/mfd/atmel-lcdc.h | 184 +++++++++++++++++++++++++++++++++++++++++
4 files changed, 353 insertions(+)
create mode 100644 drivers/mfd/atmel-lcdc.c
create mode 100644 include/linux/mfd/atmel-lcdc.h
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index b860eb5aa194..f4851f0f033f 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -121,6 +121,16 @@ config MFD_ATMEL_HLCDC
additional drivers must be enabled in order to use the
functionality of the device.
+config MFD_ATMEL_LCDC
+ tristate "Atmel LCDC (LCD Controller)"
+ select MFD_CORE
+ depends on OF
+ help
+ If you say yes here you get support for the LCDC block.
+ This driver provides common support for accessing the device,
+ additional drivers must be enabled in order to use the
+ functionality of the device.
+
config MFD_ATMEL_SMC
bool
select MFD_SYSCON
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index e9fd20dba18d..dba8465e0d96 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -186,6 +186,7 @@ obj-$(CONFIG_MFD_TPS65090) += tps65090.o
obj-$(CONFIG_MFD_AAT2870_CORE) += aat2870-core.o
obj-$(CONFIG_MFD_ATMEL_FLEXCOM) += atmel-flexcom.o
obj-$(CONFIG_MFD_ATMEL_HLCDC) += atmel-hlcdc.o
+obj-$(CONFIG_MFD_ATMEL_LCDC) += atmel-lcdc.o
obj-$(CONFIG_MFD_ATMEL_SMC) += atmel-smc.o
obj-$(CONFIG_MFD_INTEL_LPSS) += intel-lpss.o
obj-$(CONFIG_MFD_INTEL_LPSS_PCI) += intel-lpss-pci.o
diff --git a/drivers/mfd/atmel-lcdc.c b/drivers/mfd/atmel-lcdc.c
new file mode 100644
index 000000000000..8928976bafca
--- /dev/null
+++ b/drivers/mfd/atmel-lcdc.c
@@ -0,0 +1,158 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Sam Ravnborg
+ *
+ * Author: Sam Ravnborg <sam at ravnborg.org>
+ *
+ * Based on atmel-hlcdc.c wich is:
+ * Copyright (C) 2014 Free Electrons
+ * Copyright (C) 2014 Atmel
+ * Author: Boris BREZILLON <boris.brezillon at free-electrons.com>
+ */
+
+#include <linux/mfd/atmel-lcdc.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#define ATMEL_LCDC_REG_MAX (0x1000 - 0x4)
+
+struct lcdc_regmap {
+ void __iomem *regs;
+};
+
+static const struct mfd_cell lcdc_cells[] = {
+ {
+ .name = "atmel-lcdc-pwm",
+ .of_compatible = "atmel,lcdc-pwm",
+ },
+ {
+ .name = "atmel-lcdc-dc",
+ .of_compatible = "atmel,lcdc-display-controller",
+ },
+};
+
+static int regmap_lcdc_reg_write(void *context, unsigned int reg,
+ unsigned int val)
+{
+ struct lcdc_regmap *regmap = context;
+
+ writel(val, regmap->regs + reg);
+
+ return 0;
+}
+
+static int regmap_lcdc_reg_read(void *context, unsigned int reg,
+ unsigned int *val)
+{
+ struct lcdc_regmap *regmap = context;
+
+ *val = readl(regmap->regs + reg);
+
+ return 0;
+}
+
+static const struct regmap_config lcdc_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = ATMEL_LCDC_REG_MAX,
+ .reg_write = regmap_lcdc_reg_write,
+ .reg_read = regmap_lcdc_reg_read,
+ .fast_io = true,
+};
+
+static int lcdc_probe(struct platform_device *pdev)
+{
+ struct atmel_mfd_lcdc *lcdc;
+ struct lcdc_regmap *regmap;
+ struct resource *res;
+ struct device *dev;
+ int ret;
+
+ dev = &pdev->dev;
+
+ regmap = devm_kzalloc(dev, sizeof(*regmap), GFP_KERNEL);
+ if (!regmap)
+ return -ENOMEM;
+
+ lcdc = devm_kzalloc(dev, sizeof(*lcdc), GFP_KERNEL);
+ if (!lcdc)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ regmap->regs = devm_ioremap_resource(dev, res);
+ if (IS_ERR(regmap->regs)) {
+ dev_err(dev, "Failed to allocate IO mem (%ld)\n",
+ PTR_ERR(regmap->regs));
+ return PTR_ERR(regmap->regs);
+ }
+
+ lcdc->irq = platform_get_irq(pdev, 0);
+ if (lcdc->irq < 0) {
+ dev_err(dev, "Failed to get irq (%d)\n", lcdc->irq);
+ return lcdc->irq;
+ }
+
+ lcdc->lcdc_clk = devm_clk_get(dev, "lcdc_clk");
+ if (IS_ERR(lcdc->lcdc_clk)) {
+ dev_err(dev, "failed to get lcdc clock (%ld)\n",
+ PTR_ERR(lcdc->lcdc_clk));
+ return PTR_ERR(lcdc->lcdc_clk);
+ }
+
+ lcdc->bus_clk = devm_clk_get(dev, "hclk");
+ if (IS_ERR(lcdc->bus_clk)) {
+ dev_err(dev, "failed to get bus clock (%ld)\n",
+ PTR_ERR(lcdc->bus_clk));
+ return PTR_ERR(lcdc->bus_clk);
+ }
+
+ lcdc->regmap = devm_regmap_init(dev, NULL, regmap,
+ &lcdc_regmap_config);
+ if (IS_ERR(lcdc->regmap)) {
+ dev_err(dev, "Failed to init regmap (%ld)\n",
+ PTR_ERR(lcdc->regmap));
+ return PTR_ERR(lcdc->regmap);
+ }
+
+ dev_set_drvdata(dev, lcdc);
+
+ ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
+ lcdc_cells, ARRAY_SIZE(lcdc_cells),
+ NULL, 0, NULL);
+ if (ret < 0)
+ dev_err(dev, "Failed to add %d mfd devices (%d)\n",
+ ARRAY_SIZE(lcdc_cells), ret);
+
+ return ret;
+}
+
+static const struct of_device_id lcdc_match[] = {
+ { .compatible = "atmel,at91sam9261-lcdc-mfd" },
+ { .compatible = "atmel,at91sam9263-lcdc-mfd" },
+ { .compatible = "atmel,at91sam9g10-lcdc-mfd" },
+ { .compatible = "atmel,at91sam9g45-lcdc-mfd" },
+ { .compatible = "atmel,at91sam9g46-lcdc-mfd" },
+ { .compatible = "atmel,at91sam9m10-lcdc-mfd" },
+ { .compatible = "atmel,at91sam9m11-lcdc-mfd" },
+ { .compatible = "atmel,at91sam9rl-lcdc-mfd" },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, lcdc_match);
+
+static struct platform_driver lcdc_driver = {
+ .probe = lcdc_probe,
+ .driver = {
+ .name = "atmel-lcdc",
+ .of_match_table = lcdc_match,
+ },
+};
+module_platform_driver(lcdc_driver);
+
+MODULE_ALIAS("platform:atmel-lcdc");
+MODULE_AUTHOR("Sam Ravnborg <sam at ravnborg.org>");
+MODULE_DESCRIPTION("Atmel LCDC mfd driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/mfd/atmel-lcdc.h b/include/linux/mfd/atmel-lcdc.h
new file mode 100644
index 000000000000..fdab269baa8e
--- /dev/null
+++ b/include/linux/mfd/atmel-lcdc.h
@@ -0,0 +1,184 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2018 Sam Ravnborg
+ *
+ * Author: Sam Ravnborg <sam at ravnborg.org>
+ */
+
+#ifndef __LINUX_MFD_LCDC_H
+#define __LINUX_MFD_LCDC_H
+
+#include <linux/regmap.h>
+#include <linux/clk.h>
+
+/**
+ * Structure shared by the Atmel LCD Controller device and its sub-devices.
+ *
+ * @regmap: register map used to access LCDC IP registers
+ * @lcdc_clk: the lcd controller peripheral clock
+ * @bus_clk: the bus clock clock (often the same as lcdc_clk)
+ * @irq: the lcdc irq
+ */
+struct atmel_mfd_lcdc {
+ struct regmap *regmap;
+ struct clk *lcdc_clk;
+ struct clk *bus_clk;
+ int irq;
+};
+
+#define ATMEL_LCDC_DMABADDR1 0x00
+#define ATMEL_LCDC_DMABADDR2 0x04
+#define ATMEL_LCDC_DMAFRMPT1 0x08
+#define ATMEL_LCDC_DMAFRMPT2 0x0c
+#define ATMEL_LCDC_DMAFRMADD1 0x10
+#define ATMEL_LCDC_DMAFRMADD2 0x14
+
+#define ATMEL_LCDC_DMAFRMCFG 0x18
+#define ATMEL_LCDC_FRSIZE (0x7fffff << 0)
+#define ATMEL_LCDC_BLENGTH_OFFSET 24
+#define ATMEL_LCDC_BLENGTH (0x7f << ATMEL_LCDC_BLENGTH_OFFSET)
+
+#define ATMEL_LCDC_DMACON 0x1c
+#define ATMEL_LCDC_DMAEN (0x1 << 0)
+#define ATMEL_LCDC_DMARST (0x1 << 1)
+#define ATMEL_LCDC_DMABUSY (0x1 << 2)
+#define ATMEL_LCDC_DMAUPDT (0x1 << 3)
+#define ATMEL_LCDC_DMA2DEN (0x1 << 4)
+
+#define ATMEL_LCDC_DMA2DCFG 0x20
+#define ATMEL_LCDC_ADDRINC_OFFSET 0
+#define ATMEL_LCDC_ADDRINC (0xffff)
+#define ATMEL_LCDC_PIXELOFF_OFFSET 24
+#define ATMEL_LCDC_PIXELOFF (0x1f << 24)
+
+#define ATMEL_LCDC_LCDCON1 0x0800
+#define ATMEL_LCDC_BYPASS (1 << 0)
+#define ATMEL_LCDC_CLKVAL_OFFSET 12
+#define ATMEL_LCDC_CLKVAL (0x1ff << ATMEL_LCDC_CLKVAL_OFFSET)
+#define ATMEL_LCDC_LINCNT (0x7ff << 21)
+
+#define ATMEL_LCDC_LCDCON2 0x0804
+#define ATMEL_LCDC_DISTYPE (3 << 0)
+#define ATMEL_LCDC_DISTYPE_STNMONO (0 << 0)
+#define ATMEL_LCDC_DISTYPE_STNCOLOR (1 << 0)
+#define ATMEL_LCDC_DISTYPE_TFT (2 << 0)
+#define ATMEL_LCDC_SCANMOD (1 << 2)
+#define ATMEL_LCDC_SCANMOD_SINGLE (0 << 2)
+#define ATMEL_LCDC_SCANMOD_DUAL (1 << 2)
+#define ATMEL_LCDC_IFWIDTH (3 << 3)
+#define ATMEL_LCDC_IFWIDTH_4 (0 << 3)
+#define ATMEL_LCDC_IFWIDTH_8 (1 << 3)
+#define ATMEL_LCDC_IFWIDTH_16 (2 << 3)
+#define ATMEL_LCDC_PIXELSIZE (7 << 5)
+#define ATMEL_LCDC_PIXELSIZE_1 (0 << 5)
+#define ATMEL_LCDC_PIXELSIZE_2 (1 << 5)
+#define ATMEL_LCDC_PIXELSIZE_4 (2 << 5)
+#define ATMEL_LCDC_PIXELSIZE_8 (3 << 5)
+#define ATMEL_LCDC_PIXELSIZE_16 (4 << 5)
+#define ATMEL_LCDC_PIXELSIZE_24 (5 << 5)
+#define ATMEL_LCDC_PIXELSIZE_32 (6 << 5)
+#define ATMEL_LCDC_INVVD (1 << 8)
+#define ATMEL_LCDC_INVVD_NORMAL (0 << 8)
+#define ATMEL_LCDC_INVVD_INVERTED (1 << 8)
+#define ATMEL_LCDC_INVFRAME (1 << 9)
+#define ATMEL_LCDC_INVFRAME_NORMAL (0 << 9)
+#define ATMEL_LCDC_INVFRAME_INVERTED (1 << 9)
+#define ATMEL_LCDC_INVLINE (1 << 10)
+#define ATMEL_LCDC_INVLINE_NORMAL (0 << 10)
+#define ATMEL_LCDC_INVLINE_INVERTED (1 << 10)
+#define ATMEL_LCDC_INVCLK (1 << 11)
+#define ATMEL_LCDC_INVCLK_NORMAL (0 << 11)
+#define ATMEL_LCDC_INVCLK_INVERTED (1 << 11)
+#define ATMEL_LCDC_INVDVAL (1 << 12)
+#define ATMEL_LCDC_INVDVAL_NORMAL (0 << 12)
+#define ATMEL_LCDC_INVDVAL_INVERTED (1 << 12)
+#define ATMEL_LCDC_CLKMOD (1 << 15)
+#define ATMEL_LCDC_CLKMOD_ACTIVEDISPLAY (0 << 15)
+#define ATMEL_LCDC_CLKMOD_ALWAYSACTIVE (1 << 15)
+#define ATMEL_LCDC_MEMOR (1 << 31)
+#define ATMEL_LCDC_MEMOR_BIG (0 << 31)
+#define ATMEL_LCDC_MEMOR_LITTLE (1 << 31)
+
+#define ATMEL_LCDC_TIM1 0x0808
+#define ATMEL_LCDC_VFP_OFFSET 0
+#define ATMEL_LCDC_VFP (0xffU << 0)
+#define ATMEL_LCDC_VBP_OFFSET 8
+#define ATMEL_LCDC_VBP (0xffU << ATMEL_LCDC_VBP_OFFSET)
+#define ATMEL_LCDC_VPW_OFFSET 16
+#define ATMEL_LCDC_VPW (0x3fU << ATMEL_LCDC_VPW_OFFSET)
+#define ATMEL_LCDC_VHDLY_OFFSET 24
+#define ATMEL_LCDC_VHDLY (0xfU << ATMEL_LCDC_VHDLY_OFFSET)
+
+#define ATMEL_LCDC_TIM2 0x080c
+#define ATMEL_LCDC_HBP_OFFSET 0
+#define ATMEL_LCDC_HBP (0xffU << 0)
+#define ATMEL_LCDC_HPW_OFFSET 8
+#define ATMEL_LCDC_HPW (0x3fU << ATMEL_LCDC_HPW_OFFSET)
+#define ATMEL_LCDC_HFP_OFFSET 21
+#define ATMEL_LCDC_HFP (0x7ffU << ATMEL_LCDC_HFP_OFFSET)
+
+#define ATMEL_LCDC_LCDFRMCFG 0x0810
+#define ATMEL_LCDC_LINEVAL (0x7ff << 0)
+#define ATMEL_LCDC_HOZVAL_OFFSET 21
+#define ATMEL_LCDC_HOZVAL (0x7ff << ATMEL_LCDC_HOZVAL_OFFSET)
+
+#define ATMEL_LCDC_FIFO 0x0814
+#define ATMEL_LCDC_FIFOTH (0xffff)
+
+#define ATMEL_LCDC_MVAL 0x0818
+
+#define ATMEL_LCDC_DP1_2 0x081c
+#define ATMEL_LCDC_DP4_7 0x0820
+#define ATMEL_LCDC_DP3_5 0x0824
+#define ATMEL_LCDC_DP2_3 0x0828
+#define ATMEL_LCDC_DP5_7 0x082c
+#define ATMEL_LCDC_DP3_4 0x0830
+#define ATMEL_LCDC_DP4_5 0x0834
+#define ATMEL_LCDC_DP6_7 0x0838
+#define ATMEL_LCDC_DP1_2_VAL (0xff)
+#define ATMEL_LCDC_DP4_7_VAL (0xfffffff)
+#define ATMEL_LCDC_DP3_5_VAL (0xfffff)
+#define ATMEL_LCDC_DP2_3_VAL (0xfff)
+#define ATMEL_LCDC_DP5_7_VAL (0xfffffff)
+#define ATMEL_LCDC_DP3_4_VAL (0xffff)
+#define ATMEL_LCDC_DP4_5_VAL (0xfffff)
+#define ATMEL_LCDC_DP6_7_VAL (0xfffffff)
+
+#define ATMEL_LCDC_PWRCON 0x083c
+#define ATMEL_LCDC_PWR (1 << 0)
+#define ATMEL_LCDC_GUARDT_OFFSET 1
+#define ATMEL_LCDC_GUARDT (0x7f << ATMEL_LCDC_GUARDT_OFFSET)
+#define ATMEL_LCDC_BUSY (1 << 31)
+
+#define ATMEL_LCDC_CONTRAST_CTR 0x0840
+#define ATMEL_LCDC_PS (3 << 0)
+#define ATMEL_LCDC_PS_DIV1 (0 << 0)
+#define ATMEL_LCDC_PS_DIV2 (1 << 0)
+#define ATMEL_LCDC_PS_DIV4 (2 << 0)
+#define ATMEL_LCDC_PS_DIV8 (3 << 0)
+#define ATMEL_LCDC_POL (1 << 2)
+#define ATMEL_LCDC_POL_NEGATIVE (0 << 2)
+#define ATMEL_LCDC_POL_POSITIVE (1 << 2)
+#define ATMEL_LCDC_ENA (1 << 3)
+#define ATMEL_LCDC_ENA_PWMDISABLE (0 << 3)
+#define ATMEL_LCDC_ENA_PWMENABLE (1 << 3)
+
+#define ATMEL_LCDC_CONTRAST_VAL 0x0844
+#define ATMEL_LCDC_CVAL (0xff)
+
+#define ATMEL_LCDC_IER 0x0848
+#define ATMEL_LCDC_IDR 0x084c
+#define ATMEL_LCDC_IMR 0x0850
+#define ATMEL_LCDC_ISR 0x0854
+#define ATMEL_LCDC_ICR 0x0858
+#define ATMEL_LCDC_LNI (1 << 0)
+#define ATMEL_LCDC_LSTLNI (1 << 1)
+#define ATMEL_LCDC_EOFI (1 << 2)
+#define ATMEL_LCDC_UFLWI (1 << 4)
+#define ATMEL_LCDC_OWRI (1 << 5)
+#define ATMEL_LCDC_MERI (1 << 6)
+
+#define ATMEL_LCDC_LUT(n) (0x0c00 + ((n)*4))
+#define ATMEL_LCDC_LUT_SIZE 256
+
+#endif /* __LINUX_MFD_LCDC_H */
--
2.12.0
More information about the dri-devel
mailing list