[PATCH v1 3/7] mfd: add atmel-lcdc driver
Boris Brezillon
boris.brezillon at bootlin.com
Fri Aug 24 08:48:08 UTC 2018
On Sun, 12 Aug 2018 20:46:25 +0200
Sam Ravnborg <sam at ravnborg.org> wrote:
> 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.
Looks like it's (almost?) the same logic. It's probably better to have
only one driver and just add new compatibles.
>
> 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 */
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