[PATCH v2 2/2] i2c: samsung: Support platforms other than EXYNOS4 and EXYNOS5
Henrik Grimler
henrik at grimler.se
Fri Aug 9 23:08:18 CEST 2024
Hi David,
Thinking about this a bit more...
On Fri, Aug 02, 2024 at 09:19:16PM +0200, David Virag wrote:
> Newer Samsung SoCs (including newer Exynos, ExynosAuto, Google Tensor)
> still use these IPs, or slightly newer versions of it.
>
> Make these drivers available on these platforms by guarding
> EXYNOS4/EXYNOS5 specific code behind their configs, and using CCF for
> clocks on other platforms.
>
> Tested S3C I2C driver on Exynos7885.
> This along with extended clock driver should enable S3C I2C on
> Exynos850.
>
> Signed-off-by: David Virag <virag.david003 at gmail.com>
> ---
> drivers/i2c/Kconfig | 2 +-
> drivers/i2c/exynos_hs_i2c.c | 25 +++++++++++++++++++++++--
> drivers/i2c/s3c24x0_i2c.c | 30 +++++++++++++++++++++++++++---
> drivers/i2c/s3c24x0_i2c.h | 2 ++
> 4 files changed, 53 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
> index cba7f84894..52067fa7c1 100644
> --- a/drivers/i2c/Kconfig
> +++ b/drivers/i2c/Kconfig
> @@ -650,7 +650,7 @@ config SYS_I2C_GENI
>
> config SYS_I2C_S3C24X0
> bool "Samsung I2C driver"
> - depends on (ARCH_EXYNOS4 || ARCH_EXYNOS5) && DM_I2C
> + depends on DM_I2C
> help
> Support for Samsung I2C controller as Samsung SoCs.
>
> diff --git a/drivers/i2c/exynos_hs_i2c.c b/drivers/i2c/exynos_hs_i2c.c
> index 189ce6d509..fa0d1c8f64 100644
> --- a/drivers/i2c/exynos_hs_i2c.c
> +++ b/drivers/i2c/exynos_hs_i2c.c
> @@ -9,11 +9,15 @@
> #include <dm.h>
> #include <i2c.h>
> #include <log.h>
> +#if IS_ENABLED(CONFIG_ARCH_EXYNOS4) || IS_ENABLED(CONFIG_ARCH_EXYNOS5)
> #include <asm/arch/clk.h>
> #include <asm/arch/cpu.h>
> #include <asm/arch/pinmux.h>
> +#endif
We want to try to move the Exynos 4 and 5 devices to CCF and
OF_UPSTREAM as well, which will make this messy. Can we check
CONFIG_CLK_EXYNOS and CONFIG_PINCTRL_EXYNOS instead?
> #include <asm/global_data.h>
> +#include <asm/io.h>
> #include <linux/delay.h>
> +#include <clk.h>
> #include "s3c24x0_i2c.h"
>
> DECLARE_GLOBAL_DATA_PTR;
> @@ -137,15 +141,26 @@ static int hsi2c_wait_for_trx(struct exynos5_hsi2c *i2c)
> return I2C_NOK_TOUT;
> }
>
> -static int hsi2c_get_clk_details(struct s3c24x0_i2c_bus *i2c_bus)
> +static int hsi2c_get_clk_details(struct udevice *dev)
> {
> + struct s3c24x0_i2c_bus *i2c_bus = dev_get_priv(dev);
> struct exynos5_hsi2c *hsregs = i2c_bus->hsregs;
> ulong clkin;
> unsigned int op_clk = i2c_bus->clock_frequency;
> unsigned int i = 0, utemp0 = 0, utemp1 = 0;
> unsigned int t_ftl_cycle;
>
> +#if IS_ENABLED(CONFIG_ARCH_EXYNOS4) || IS_ENABLED(CONFIG_ARCH_EXYNOS5)
As above, can we check CONFIG_CLK_EXYNOS instead?
> clkin = get_i2c_clk();
> +#else
> + struct clk clk;
> + int ret;
> +
> + ret = clk_get_by_name(dev, "hsi2c", &clk);
> + if (ret < 0)
> + return ret;
> + clkin = clk_get_rate(&clk);
> +#endif
> /* FPCLK / FI2C =
> * (CLK_DIV + 1) * (TSCLK_L + TSCLK_H + 2) + 8 + 2 * FLT_CYCLE
> * uTemp0 = (CLK_DIV + 1) * (TSCLK_L + TSCLK_H + 2)
> @@ -487,7 +502,7 @@ static int s3c24x0_i2c_set_bus_speed(struct udevice *dev, unsigned int speed)
>
> i2c_bus->clock_frequency = speed;
>
> - if (hsi2c_get_clk_details(i2c_bus))
> + if (hsi2c_get_clk_details(dev))
> return -EFAULT;
> hsi2c_ch_init(i2c_bus);
>
> @@ -514,7 +529,9 @@ static int s3c24x0_i2c_probe(struct udevice *dev, uint chip, uint chip_flags)
>
> static int s3c_i2c_of_to_plat(struct udevice *dev)
> {
> +#if IS_ENABLED(CONFIG_ARCH_EXYNOS4) || IS_ENABLED(CONFIG_ARCH_EXYNOS5)
> const void *blob = gd->fdt_blob;
> +#endif
> struct s3c24x0_i2c_bus *i2c_bus = dev_get_priv(dev);
> int node;
>
> @@ -522,7 +539,9 @@ static int s3c_i2c_of_to_plat(struct udevice *dev)
>
> i2c_bus->hsregs = dev_read_addr_ptr(dev);
>
> +#if IS_ENABLED(CONFIG_ARCH_EXYNOS4) || IS_ENABLED(CONFIG_ARCH_EXYNOS5)
> i2c_bus->id = pinmux_decode_periph_id(blob, node);
> +#endif
>
> i2c_bus->clock_frequency =
> dev_read_u32_default(dev, "clock-frequency",
> @@ -530,7 +549,9 @@ static int s3c_i2c_of_to_plat(struct udevice *dev)
> i2c_bus->node = node;
> i2c_bus->bus_num = dev_seq(dev);
>
> +#if IS_ENABLED(CONFIG_ARCH_EXYNOS4) || IS_ENABLED(CONFIG_ARCH_EXYNOS5)
> exynos_pinmux_config(i2c_bus->id, PINMUX_FLAG_HS_MODE);
> +#endif
I think these three #if def's can be consolidated in one #if def group
towards the end of s3c_i2c_of_to_plat to make it easier to follow.
Also, can we check CONFIG_PINCTRL_EXYNOS instead? That would make it
easier when migrating Exynos 4 and 5 devices to pinctrl driver and
OF_UPSTREAM.
Same comments apply to s3c24x0_i2c.c below.
Best regards,
Henrik Grimler
> i2c_bus->active = true;
>
> diff --git a/drivers/i2c/s3c24x0_i2c.c b/drivers/i2c/s3c24x0_i2c.c
> index ae3a801cad..ade1ad6cef 100644
> --- a/drivers/i2c/s3c24x0_i2c.c
> +++ b/drivers/i2c/s3c24x0_i2c.c
> @@ -9,12 +9,15 @@
> #include <fdtdec.h>
> #include <time.h>
> #include <log.h>
> +#if IS_ENABLED(CONFIG_ARCH_EXYNOS4) || IS_ENABLED(CONFIG_ARCH_EXYNOS5)
> #include <asm/arch/clk.h>
> #include <asm/arch/cpu.h>
> #include <asm/arch/pinmux.h>
> +#endif
> #include <asm/global_data.h>
> #include <asm/io.h>
> #include <i2c.h>
> +#include <clk.h>
> #include "s3c24x0_i2c.h"
>
> DECLARE_GLOBAL_DATA_PTR;
> @@ -46,10 +49,23 @@ static void read_write_byte(struct s3c24x0_i2c *i2c)
> clrbits_le32(&i2c->iiccon, I2CCON_IRPND);
> }
>
> -static void i2c_ch_init(struct s3c24x0_i2c *i2c, int speed, int slaveadd)
> +static int i2c_ch_init(struct udevice *dev, int speed, int slaveadd)
> {
> + struct s3c24x0_i2c_bus *i2c_bus = dev_get_priv(dev);
> + struct s3c24x0_i2c *i2c = i2c_bus->regs;
> ulong freq, pres = 16, div;
> +
> +#if IS_ENABLED(CONFIG_ARCH_EXYNOS4) || defined(CONFIG_ARCH_EXYNOS5)
> freq = get_i2c_clk();
> +#else
> + struct clk clk;
> + int ret;
> +
> + ret = clk_get_by_name(dev, "i2c", &clk);
> + if (ret < 0)
> + return ret;
> + freq = clk_get_rate(&clk);
> +#endif
> /* calculate prescaler and divisor values */
> if ((freq / pres / (16 + 1)) > speed)
> /* set prescaler to 512 */
> @@ -67,6 +83,7 @@ static void i2c_ch_init(struct s3c24x0_i2c *i2c, int speed, int slaveadd)
> writel(slaveadd, &i2c->iicadd);
> /* program Master Transmit (and implicit STOP) */
> writel(I2C_MODE_MT | I2C_TXRX_ENA, &i2c->iicstat);
> + return 0;
> }
>
> #define SYS_I2C_S3C24X0_SLAVE_ADDR 0
> @@ -77,8 +94,9 @@ static int s3c24x0_i2c_set_bus_speed(struct udevice *dev, unsigned int speed)
>
> i2c_bus->clock_frequency = speed;
>
> - i2c_ch_init(i2c_bus->regs, i2c_bus->clock_frequency,
> - SYS_I2C_S3C24X0_SLAVE_ADDR);
> + if (i2c_ch_init(dev, i2c_bus->clock_frequency,
> + SYS_I2C_S3C24X0_SLAVE_ADDR))
> + return -EFAULT;
>
> return 0;
> }
> @@ -293,7 +311,9 @@ static int s3c24x0_i2c_xfer(struct udevice *dev, struct i2c_msg *msg,
>
> static int s3c_i2c_of_to_plat(struct udevice *dev)
> {
> +#if IS_ENABLED(CONFIG_ARCH_EXYNOS4) || IS_ENABLED(CONFIG_ARCH_EXYNOS5)
> const void *blob = gd->fdt_blob;
> +#endif
> struct s3c24x0_i2c_bus *i2c_bus = dev_get_priv(dev);
> int node;
>
> @@ -301,7 +321,9 @@ static int s3c_i2c_of_to_plat(struct udevice *dev)
>
> i2c_bus->regs = dev_read_addr_ptr(dev);
>
> +#if IS_ENABLED(CONFIG_ARCH_EXYNOS4) || IS_ENABLED(CONFIG_ARCH_EXYNOS5)
> i2c_bus->id = pinmux_decode_periph_id(blob, node);
> +#endif
>
> i2c_bus->clock_frequency =
> dev_read_u32_default(dev, "clock-frequency",
> @@ -309,7 +331,9 @@ static int s3c_i2c_of_to_plat(struct udevice *dev)
> i2c_bus->node = node;
> i2c_bus->bus_num = dev_seq(dev);
>
> +#if IS_ENABLED(CONFIG_ARCH_EXYNOS4) || IS_ENABLED(CONFIG_ARCH_EXYNOS5)
> exynos_pinmux_config(i2c_bus->id, 0);
> +#endif
>
> i2c_bus->active = true;
>
> diff --git a/drivers/i2c/s3c24x0_i2c.h b/drivers/i2c/s3c24x0_i2c.h
> index ec8f1acaef..12249d5c14 100644
> --- a/drivers/i2c/s3c24x0_i2c.h
> +++ b/drivers/i2c/s3c24x0_i2c.h
> @@ -54,7 +54,9 @@ struct s3c24x0_i2c_bus {
> struct exynos5_hsi2c *hsregs;
> int is_highspeed; /* High speed type, rather than I2C */
> unsigned clock_frequency;
> +#if IS_ENABLED(CONFIG_ARCH_EXYNOS4) || IS_ENABLED(CONFIG_ARCH_EXYNOS5)
> int id;
> +#endif
> unsigned clk_cycle;
> unsigned clk_div;
> };
> --
> 2.46.0
>
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