Re: [PATCH 2/3] pinctrl: actions: Add Actions S500 pinctrl driver

From: Cristian Ciocaltea
Date: Fri Jun 26 2020 - 13:11:59 EST

On Fri, Jun 26, 2020 at 07:59:41PM +0530, Manivannan Sadhasivam wrote:
> On Thu, Jun 25, 2020 at 11:16:19PM +0300, Cristian Ciocaltea wrote:
> > Add pinctrl and gpio driver for Actions Semi S500 SoC.
> >
> > The driver supports pinctrl, pinmux, pinconf, gpio and interrupt
> > functions using a set of registers shared between gpio and pinctrl.
> >
> > Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxx>
> > ---
> > drivers/pinctrl/actions/Kconfig | 6 +
> > drivers/pinctrl/actions/Makefile | 1 +
> > drivers/pinctrl/actions/pinctrl-s500.c | 1727 ++++++++++++++++++++++++
> > 3 files changed, 1734 insertions(+)
> > create mode 100644 drivers/pinctrl/actions/pinctrl-s500.c
> >
> > diff --git a/drivers/pinctrl/actions/Kconfig b/drivers/pinctrl/actions/Kconfig
> > index 966f1c2c89d6..a1d16e8280e5 100644
> > --- a/drivers/pinctrl/actions/Kconfig
> > +++ b/drivers/pinctrl/actions/Kconfig
> > @@ -10,6 +10,12 @@ config PINCTRL_OWL
> > help
> > Say Y here to enable Actions Semi OWL pinctrl driver
> >
> > +config PINCTRL_S500
> > + bool "Actions Semi S500 pinctrl driver"
> > + depends on PINCTRL_OWL
> > + help
> > + Say Y here to enable Actions Semi S500 pinctrl driver
> > +
> > config PINCTRL_S700
> > bool "Actions Semi S700 pinctrl driver"
> > depends on PINCTRL_OWL
> > diff --git a/drivers/pinctrl/actions/Makefile b/drivers/pinctrl/actions/Makefile
> > index 61aa9107a43a..b9e2c527c9d3 100644
> > --- a/drivers/pinctrl/actions/Makefile
> > +++ b/drivers/pinctrl/actions/Makefile
> > @@ -1,4 +1,5 @@
> > # SPDX-License-Identifier: GPL-2.0-only
> > obj-$(CONFIG_PINCTRL_OWL) += pinctrl-owl.o
> > +obj-$(CONFIG_PINCTRL_S500) += pinctrl-s500.o
> > obj-$(CONFIG_PINCTRL_S700) += pinctrl-s700.o
> > obj-$(CONFIG_PINCTRL_S900) += pinctrl-s900.o
> > diff --git a/drivers/pinctrl/actions/pinctrl-s500.c b/drivers/pinctrl/actions/pinctrl-s500.c
> > new file mode 100644
> > index 000000000000..38e30914af6e
> > --- /dev/null
> > +++ b/drivers/pinctrl/actions/pinctrl-s500.c
> > @@ -0,0 +1,1727 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Actions Semi S500 SoC Pinctrl driver
> > + *
> > + * Copyright (c) 2014 Actions Semi Inc.
> > + * Copyright (c) 2020 Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxx>
> > + */
> > +
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/pinctrl/pinconf-generic.h>
> > +#include <linux/pinctrl/pinctrl.h>
> > +#include "pinctrl-owl.h"
> > +
> > +/* Pinctrl registers offset */
> > +#define MFCTL0 (0x0040)
> > +#define MFCTL1 (0x0044)
> > +#define MFCTL2 (0x0048)
> > +#define MFCTL3 (0x004C)
> > +#define PAD_PULLCTL0 (0x0060)
> > +#define PAD_PULLCTL1 (0x0064)
> > +#define PAD_PULLCTL2 (0x0068)
> > +#define PAD_ST0 (0x006C)
> > +#define PAD_ST1 (0x0070)
> > +#define PAD_CTL (0x0074)
> > +#define PAD_DRV0 (0x0080)
> > +#define PAD_DRV1 (0x0084)
> > +#define PAD_DRV2 (0x0088)
> > +
> > +#define _GPIOA(offset) (offset)
> > +#define _GPIOB(offset) (32 + (offset))
> > +#define _GPIOC(offset) (64 + (offset))
> > +#define _GPIOD(offset) (96 + (offset))
> > +#define _GPIOE(offset) (128 + (offset))
> > +
> > +#define NUM_GPIOS (_GPIOE(3) + 1)
> > +#define _PIN(offset) (NUM_GPIOS + (offset))
> > +
> > +#define DNAND_DQS _GPIOA(12)
> > +#define DNAND_DQSN _GPIOA(13)
> > +#define ETH_TXD0 _GPIOA(14)
> > +#define ETH_TXD1 _GPIOA(15)
> > +#define ETH_TXEN _GPIOA(16)
> > +#define ETH_RXER _GPIOA(17)
> > +#define ETH_CRS_DV _GPIOA(18)
> > +#define ETH_RXD1 _GPIOA(19)
> > +#define ETH_RXD0 _GPIOA(20)
> > +#define ETH_REF_CLK _GPIOA(21)
> > +#define ETH_MDC _GPIOA(22)
> > +#define ETH_MDIO _GPIOA(23)
> > +#define SIRQ0 _GPIOA(24)
> > +#define SIRQ1 _GPIOA(25)
> > +#define SIRQ2 _GPIOA(26)
> > +#define I2S_D0 _GPIOA(27)
> > +#define I2S_BCLK0 _GPIOA(28)
> > +#define I2S_LRCLK0 _GPIOA(29)
> > +#define I2S_MCLK0 _GPIOA(30)
> > +#define I2S_D1 _GPIOA(31)
> > +
> > +#define I2S_BCLK1 _GPIOB(0)
> > +#define I2S_LRCLK1 _GPIOB(1)
> > +#define I2S_MCLK1 _GPIOB(2)
> > +#define KS_IN0 _GPIOB(3)
> > +#define KS_IN1 _GPIOB(4)
> > +#define KS_IN2 _GPIOB(5)
> > +#define KS_IN3 _GPIOB(6)
> > +#define KS_OUT0 _GPIOB(7)
> > +#define KS_OUT1 _GPIOB(8)
> > +#define KS_OUT2 _GPIOB(9)
> > +#define LVDS_OEP _GPIOB(10)
> > +#define LVDS_OEN _GPIOB(11)
> > +#define LVDS_ODP _GPIOB(12)
> > +#define LVDS_ODN _GPIOB(13)
> > +#define LVDS_OCP _GPIOB(14)
> > +#define LVDS_OCN _GPIOB(15)
> > +#define LVDS_OBP _GPIOB(16)
> > +#define LVDS_OBN _GPIOB(17)
> > +#define LVDS_OAP _GPIOB(18)
> > +#define LVDS_OAN _GPIOB(19)
> > +#define LVDS_EEP _GPIOB(20)
> > +#define LVDS_EEN _GPIOB(21)
> > +#define LVDS_EDP _GPIOB(22)
> > +#define LVDS_EDN _GPIOB(23)
> > +#define LVDS_ECP _GPIOB(24)
> > +#define LVDS_ECN _GPIOB(25)
> > +#define LVDS_EBP _GPIOB(26)
> > +#define LVDS_EBN _GPIOB(27)
> > +#define LVDS_EAP _GPIOB(28)
> > +#define LVDS_EAN _GPIOB(29)
> > +#define LCD0_D18 _GPIOB(30)
> > +#define LCD0_D17 _GPIOB(31)
> > +
> > +#define DSI_DP3 _GPIOC(0)
> > +#define DSI_DN3 _GPIOC(1)
> > +#define DSI_DP1 _GPIOC(2)
> > +#define DSI_DN1 _GPIOC(3)
> > +#define DSI_CP _GPIOC(4)
> > +#define DSI_CN _GPIOC(5)
> > +#define DSI_DP0 _GPIOC(6)
> > +#define DSI_DN0 _GPIOC(7)
> > +#define DSI_DP2 _GPIOC(8)
> > +#define DSI_DN2 _GPIOC(9)
> > +#define SD0_D0 _GPIOC(10)
> > +#define SD0_D1 _GPIOC(11)
> > +#define SD0_D2 _GPIOC(12)
> > +#define SD0_D3 _GPIOC(13)
> > +#define SD1_D0 _GPIOC(14) /* SD0_D4 */
> > +#define SD1_D1 _GPIOC(15) /* SD0_D5 */
> > +#define SD1_D2 _GPIOC(16) /* SD0_D6 */
> > +#define SD1_D3 _GPIOC(17) /* SD0_D7 */
> > +#define SD0_CMD _GPIOC(18)
> > +#define SD0_CLK _GPIOC(19)
> > +#define SD1_CMD _GPIOC(20)
> > +#define SD1_CLK _GPIOC(21)
> > +#define SPI0_SCLK _GPIOC(22)
> > +#define SPI0_SS _GPIOC(23)
> > +#define SPI0_MISO _GPIOC(24)
> > +#define SPI0_MOSI _GPIOC(25)
> > +#define UART0_RX _GPIOC(26)
> > +#define UART0_TX _GPIOC(27)
> > +#define I2C0_SCLK _GPIOC(28)
> > +#define I2C0_SDATA _GPIOC(29)
> > +#define SENSOR0_PCLK _GPIOC(31)
> > +
> > +#define SENSOR0_CKOUT _GPIOD(10)
> > +#define DNAND_ALE _GPIOD(12)
> > +#define DNAND_CLE _GPIOD(13)
> > +#define DNAND_CEB0 _GPIOD(14)
> > +#define DNAND_CEB1 _GPIOD(15)
> > +#define DNAND_CEB2 _GPIOD(16)
> > +#define DNAND_CEB3 _GPIOD(17)
> > +#define UART2_RX _GPIOD(18)
> > +#define UART2_TX _GPIOD(19)
> > +#define UART2_RTSB _GPIOD(20)
> > +#define UART2_CTSB _GPIOD(21)
> > +#define UART3_RX _GPIOD(22)
> > +#define UART3_TX _GPIOD(23)
> > +#define UART3_RTSB _GPIOD(24)
> > +#define UART3_CTSB _GPIOD(25)
> > +#define PCM1_IN _GPIOD(28)
> > +#define PCM1_CLK _GPIOD(29)
> > +#define PCM1_SYNC _GPIOD(30)
> > +#define PCM1_OUT _GPIOD(31)
> > +
> > +#define I2C1_SCLK _GPIOE(0)
> > +#define I2C1_SDATA _GPIOE(1)
> > +#define I2C2_SCLK _GPIOE(2)
> > +#define I2C2_SDATA _GPIOE(3)
> > +
> > +#define CSI_DN0 _PIN(0)
> > +#define CSI_DP0 _PIN(1)
> > +#define CSI_DN1 _PIN(2)
> > +#define CSI_DP1 _PIN(3)
> > +#define CSI_CN _PIN(4)
> > +#define CSI_CP _PIN(5)
> > +#define CSI_DN2 _PIN(6)
> > +#define CSI_DP2 _PIN(7)
> > +#define CSI_DN3 _PIN(8)
> > +#define CSI_DP3 _PIN(9)
> > +
> > +#define DNAND_D0 _PIN(10)
> > +#define DNAND_D1 _PIN(11)
> > +#define DNAND_D2 _PIN(12)
> > +#define DNAND_D3 _PIN(13)
> > +#define DNAND_D4 _PIN(14)
> > +#define DNAND_D5 _PIN(15)
> > +#define DNAND_D6 _PIN(16)
> > +#define DNAND_D7 _PIN(17)
> > +#define DNAND_WRB _PIN(18)
> > +#define DNAND_RDB _PIN(19)
> > +#define DNAND_RDBN _PIN(20)
> > +#define DNAND_RB _PIN(21)
> > +
> > +#define PORB _PIN(22)
> > +#define CLKO_25M _PIN(23)
> > +#define BSEL _PIN(24)
> > +#define PKG0 _PIN(25)
> > +#define PKG1 _PIN(26)
> > +#define PKG2 _PIN(27)
> > +#define PKG3 _PIN(28)
> > +
> > +#define _FIRSTPAD _GPIOA(0)
> > +#define _LASTPAD PKG3
> > +#define NUM_PADS (_PIN(28) + 1)
> > +
>
> [...]
>
> > +static const struct owl_gpio_port s500_gpio_ports[] = {
> > + OWL_GPIO_PORT(A, 0x0000, 32, 0x0, 0x4, 0x8, 0x204, 0x208, 0x20C, 0x230, 0),
> > + OWL_GPIO_PORT(B, 0x000C, 32, 0x0, 0x4, 0x8, 0x1F8, 0x204, 0x208, 0x22C, 1),
> > + OWL_GPIO_PORT(C, 0x0018, 32, 0x0, 0x4, 0x8, 0x1EC, 0x200, 0x204, 0x228, 2),
> > + OWL_GPIO_PORT(D, 0x0024, 32, 0x0, 0x4, 0x8, 0x1E0, 0x1FC, 0x200, 0x224, 3),
> > + OWL_GPIO_PORT(E, 0x0030, 4, 0x0, 0x4, 0x8, 0x1D4, 0x1F8, 0x1FC, 0x220, 4),
>
> Except PORT-A, rest of the offsets for ports seems to be wrong. From where did
> you get these?
>
> Thanks,
> Mani

I computed the offsets using the S500 Datasheet, v1.6 (2016-03-07).

Below is an excerpt from chapter '30.4 Register List':

-------+--------------
Offset | Register Name
-------+--------------
0x000C | GPIO_BOUTEN
0x0010 | GPIO_BINEN
0x0014 | GPIO_BDAT
...
0x0204 | INTC_GPIOCTL
0x0210 | INTC_GPIOB_PD
0x0214 | INTC_GPIOB_MSK
...
0x0238 | INTC_GPIOB_TYPE0
-------+--------------

Hence, for PORT-B, I got the following values:

OWL_GPIO_PORT(B,
0x000C, /* base = GPIO_BOUTEN = 0x000C */
32,
0x0, /* GPIO_BOUTEN - base */
0x4, /* GPIO_BINEN - base */
0x8, /* GPIO_BDAT - base */
0x1F8, /* INTC_GPIOCTL - base */
0x204, /* INTC_GPIOB_PD - base */
0x208, /* INTC_GPIOB_MSK - base */
0x22C, /* INTC_GPIOB_TYPE0 - base */
1),

Did I miss something?

Thanks,
Cristi

>
> > +};
> > +
> > +enum s500_pinconf_pull {
> > + OWL_PINCONF_PULL_DOWN,
> > + OWL_PINCONF_PULL_UP,
> > +};
> > +
> > +static int s500_pad_pinconf_arg2val(const struct owl_padinfo *info,
> > + unsigned int param, u32 *arg)
> > +{
> > + switch (param) {
> > + case PIN_CONFIG_BIAS_PULL_DOWN:
> > + *arg = OWL_PINCONF_PULL_DOWN;
> > + break;
> > + case PIN_CONFIG_BIAS_PULL_UP:
> > + *arg = OWL_PINCONF_PULL_UP;
> > + break;
> > + case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
> > + *arg = (*arg >= 1 ? 1 : 0);
> > + break;
> > + default:
> > + return -EOPNOTSUPP;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int s500_pad_pinconf_val2arg(const struct owl_padinfo *padinfo,
> > + unsigned int param, u32 *arg)
> > +{
> > + switch (param) {
> > + case PIN_CONFIG_BIAS_PULL_DOWN:
> > + *arg = *arg == OWL_PINCONF_PULL_DOWN;
> > + break;
> > + case PIN_CONFIG_BIAS_PULL_UP:
> > + *arg = *arg == OWL_PINCONF_PULL_UP;
> > + break;
> > + case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
> > + *arg = *arg == 1;
> > + break;
> > + default:
> > + return -EOPNOTSUPP;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static struct owl_pinctrl_soc_data s500_pinctrl_data = {
> > + .padinfo = s500_padinfo,
> > + .pins = (const struct pinctrl_pin_desc *)s500_pads,
> > + .npins = ARRAY_SIZE(s500_pads),
> > + .functions = s500_functions,
> > + .nfunctions = ARRAY_SIZE(s500_functions),
> > + .groups = s500_groups,
> > + .ngroups = ARRAY_SIZE(s500_groups),
> > + .ngpios = NUM_GPIOS,
> > + .ports = s500_gpio_ports,
> > + .nports = ARRAY_SIZE(s500_gpio_ports),
> > + .padctl_arg2val = s500_pad_pinconf_arg2val,
> > + .padctl_val2arg = s500_pad_pinconf_val2arg,
> > +};
> > +
> > +static int s500_pinctrl_probe(struct platform_device *pdev)
> > +{
> > + return owl_pinctrl_probe(pdev, &s500_pinctrl_data);
> > +}
> > +
> > +static const struct of_device_id s500_pinctrl_of_match[] = {
> > + { .compatible = "actions,s500-pinctrl", },
> > + { }
> > +};
> > +
> > +static struct platform_driver s500_pinctrl_driver = {
> > + .driver = {
> > + .name = "pinctrl-s500",
> > + .of_match_table = of_match_ptr(s500_pinctrl_of_match),
> > + },
> > + .probe = s500_pinctrl_probe,
> > +};
> > +
> > +static int __init s500_pinctrl_init(void)
> > +{
> > + return platform_driver_register(&s500_pinctrl_driver);
> > +}
> > +arch_initcall(s500_pinctrl_init);
> > +
> > +static void __exit s500_pinctrl_exit(void)
> > +{
> > + platform_driver_unregister(&s500_pinctrl_driver);
> > +}
> > +module_exit(s500_pinctrl_exit);
> > +
> > +MODULE_AUTHOR("Actions Semi Inc.");
> > +MODULE_AUTHOR("Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxx>");
> > +MODULE_DESCRIPTION("Actions Semi S500 SoC Pinctrl Driver");
> > +MODULE_LICENSE("GPL");
> > --
> > 2.27.0
> >