| Message ID | 20250102204015.222653-4-ivo.ivanov.ivanov1@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | soc: samsung: usi: implement support for USIv1 | expand |
On Thu, Jan 02, 2025 at 10:40:15PM +0200, Ivaylo Ivanov wrote: > /* USIv2: System Register: SW_CONF register bits */ > #define USI_V2_SW_CONF_NONE 0x0 > #define USI_V2_SW_CONF_UART BIT(0) > @@ -34,7 +46,8 @@ > #define USI_OPTION_CLKSTOP_ON BIT(2) > > enum exynos_usi_ver { > - USI_VER2 = 2, > + USI_VER1 = 1, > + USI_VER2, > }; > > struct exynos_usi_variant { > @@ -66,6 +79,16 @@ struct exynos_usi_mode { > unsigned int val; /* mode register value */ > }; > > +static const struct exynos_usi_mode exynos_usi_v1_modes[] = { > + [USI_V1_NONE] = { .name = "none", .val = USI_V1_SW_CONF_NONE }, > + [USI_V1_I2C0] = { .name = "i2c0", .val = USI_V1_SW_CONF_I2C0 }, > + [USI_V1_I2C1] = { .name = "i2c1", .val = USI_V1_SW_CONF_I2C1 }, > + [USI_V1_I2C0_1] = { .name = "i2c0_1", .val = USI_V1_SW_CONF_I2C0_1 }, > + [USI_V1_SPI] = { .name = "spi", .val = USI_V1_SW_CONF_SPI }, > + [USI_V1_UART] = { .name = "uart", .val = USI_V1_SW_CONF_UART }, > + [USI_V1_UART_I2C1] = { .name = "uart_i2c1", .val = USI_V1_SW_CONF_UART_I2C1 }, Now I see why you duplicated the IDs... With my approach your code here is even simpler. Allows to drop USI_VER1 as well. > +}; > + > static const struct exynos_usi_mode exynos_usi_modes[] = { > [USI_V2_NONE] = { .name = "none", .val = USI_V2_SW_CONF_NONE }, > [USI_V2_UART] = { .name = "uart", .val = USI_V2_SW_CONF_UART }, > @@ -83,11 +106,24 @@ static const struct exynos_usi_variant exynos850_usi_data = { > .clk_names = exynos850_usi_clk_names, > }; > > +static const struct exynos_usi_variant exynos8895_usi_data = { > + .ver = USI_VER1, > + .sw_conf_mask = USI_V1_SW_CONF_MASK, > + .min_mode = USI_V1_NONE, > + .max_mode = USI_V1_UART_I2C1, > + .num_clks = ARRAY_SIZE(exynos850_usi_clk_names), > + .clk_names = exynos850_usi_clk_names, > +}; > + > static const struct of_device_id exynos_usi_dt_match[] = { > { > .compatible = "samsung,exynos850-usi", > .data = &exynos850_usi_data, > }, > + { > + .compatible = "samsung,exynos8895-usi", > + .data = &exynos8895_usi_data, > + }, > { } /* sentinel */ > }; > MODULE_DEVICE_TABLE(of, exynos_usi_dt_match); > @@ -105,18 +141,32 @@ static int exynos_usi_set_sw_conf(struct exynos_usi *usi, size_t mode) > { > unsigned int val; > int ret; > + const char *name; > > + usi->mode = mode; > if (mode < usi->data->min_mode || mode > usi->data->max_mode) > return -EINVAL; > > - val = exynos_usi_modes[mode].val; > + switch (usi->data->ver) { > + case USI_VER1: > + val = exynos_usi_v1_modes[mode].val; > + name = exynos_usi_v1_modes[usi->mode].name; > + break; > + case USI_VER2: > + val = exynos_usi_modes[mode].val; > + name = exynos_usi_modes[usi->mode].name; > + break; > + default: > + return -EINVAL; > + } > + > ret = regmap_update_bits(usi->sysreg, usi->sw_conf, > usi->data->sw_conf_mask, val); > + No, why? Drop. Best regards, Krzysztof
On 04/01/2025 10:36, Ivaylo Ivanov wrote: >>> struct exynos_usi_variant { >>> @@ -66,6 +79,16 @@ struct exynos_usi_mode { >>> unsigned int val; /* mode register value */ >>> }; >>> >>> +static const struct exynos_usi_mode exynos_usi_v1_modes[] = { >>> + [USI_V1_NONE] = { .name = "none", .val = USI_V1_SW_CONF_NONE }, >>> + [USI_V1_I2C0] = { .name = "i2c0", .val = USI_V1_SW_CONF_I2C0 }, >>> + [USI_V1_I2C1] = { .name = "i2c1", .val = USI_V1_SW_CONF_I2C1 }, >>> + [USI_V1_I2C0_1] = { .name = "i2c0_1", .val = USI_V1_SW_CONF_I2C0_1 }, >>> + [USI_V1_SPI] = { .name = "spi", .val = USI_V1_SW_CONF_SPI }, >>> + [USI_V1_UART] = { .name = "uart", .val = USI_V1_SW_CONF_UART }, >>> + [USI_V1_UART_I2C1] = { .name = "uart_i2c1", .val = USI_V1_SW_CONF_UART_I2C1 }, >> Now I see why you duplicated the IDs... With my approach your code here >> is even simpler. Allows to drop USI_VER1 as well. > > We can't really drop USI_VER1, as we'll fall into USIV2-specific code, like so: > if (usi->data->ver == USI_VER2) return exynos_usi_enable(usi); Yeah, indeed. You still would have just one exynos_usi_mode table. Best regards, Krzysztof
diff --git a/drivers/soc/samsung/exynos-usi.c b/drivers/soc/samsung/exynos-usi.c index 114352695..29c3770e3 100644 --- a/drivers/soc/samsung/exynos-usi.c +++ b/drivers/soc/samsung/exynos-usi.c @@ -16,6 +16,18 @@ #include <dt-bindings/soc/samsung,exynos-usi.h> +/* USIv1: System Register: SW_CONF register bits */ +#define USI_V1_SW_CONF_NONE 0x0 +#define USI_V1_SW_CONF_I2C0 0x1 +#define USI_V1_SW_CONF_I2C1 0x2 +#define USI_V1_SW_CONF_I2C0_1 0x3 +#define USI_V1_SW_CONF_SPI 0x4 +#define USI_V1_SW_CONF_UART 0x8 +#define USI_V1_SW_CONF_UART_I2C1 0xa +#define USI_V1_SW_CONF_MASK (USI_V1_SW_CONF_I2C0 | USI_V1_SW_CONF_I2C1 | \ + USI_V1_SW_CONF_I2C0_1 | USI_V1_SW_CONF_SPI | \ + USI_V1_SW_CONF_UART | USI_V1_SW_CONF_UART_I2C1) + /* USIv2: System Register: SW_CONF register bits */ #define USI_V2_SW_CONF_NONE 0x0 #define USI_V2_SW_CONF_UART BIT(0) @@ -34,7 +46,8 @@ #define USI_OPTION_CLKSTOP_ON BIT(2) enum exynos_usi_ver { - USI_VER2 = 2, + USI_VER1 = 1, + USI_VER2, }; struct exynos_usi_variant { @@ -66,6 +79,16 @@ struct exynos_usi_mode { unsigned int val; /* mode register value */ }; +static const struct exynos_usi_mode exynos_usi_v1_modes[] = { + [USI_V1_NONE] = { .name = "none", .val = USI_V1_SW_CONF_NONE }, + [USI_V1_I2C0] = { .name = "i2c0", .val = USI_V1_SW_CONF_I2C0 }, + [USI_V1_I2C1] = { .name = "i2c1", .val = USI_V1_SW_CONF_I2C1 }, + [USI_V1_I2C0_1] = { .name = "i2c0_1", .val = USI_V1_SW_CONF_I2C0_1 }, + [USI_V1_SPI] = { .name = "spi", .val = USI_V1_SW_CONF_SPI }, + [USI_V1_UART] = { .name = "uart", .val = USI_V1_SW_CONF_UART }, + [USI_V1_UART_I2C1] = { .name = "uart_i2c1", .val = USI_V1_SW_CONF_UART_I2C1 }, +}; + static const struct exynos_usi_mode exynos_usi_modes[] = { [USI_V2_NONE] = { .name = "none", .val = USI_V2_SW_CONF_NONE }, [USI_V2_UART] = { .name = "uart", .val = USI_V2_SW_CONF_UART }, @@ -83,11 +106,24 @@ static const struct exynos_usi_variant exynos850_usi_data = { .clk_names = exynos850_usi_clk_names, }; +static const struct exynos_usi_variant exynos8895_usi_data = { + .ver = USI_VER1, + .sw_conf_mask = USI_V1_SW_CONF_MASK, + .min_mode = USI_V1_NONE, + .max_mode = USI_V1_UART_I2C1, + .num_clks = ARRAY_SIZE(exynos850_usi_clk_names), + .clk_names = exynos850_usi_clk_names, +}; + static const struct of_device_id exynos_usi_dt_match[] = { { .compatible = "samsung,exynos850-usi", .data = &exynos850_usi_data, }, + { + .compatible = "samsung,exynos8895-usi", + .data = &exynos8895_usi_data, + }, { } /* sentinel */ }; MODULE_DEVICE_TABLE(of, exynos_usi_dt_match); @@ -105,18 +141,32 @@ static int exynos_usi_set_sw_conf(struct exynos_usi *usi, size_t mode) { unsigned int val; int ret; + const char *name; + usi->mode = mode; if (mode < usi->data->min_mode || mode > usi->data->max_mode) return -EINVAL; - val = exynos_usi_modes[mode].val; + switch (usi->data->ver) { + case USI_VER1: + val = exynos_usi_v1_modes[mode].val; + name = exynos_usi_v1_modes[usi->mode].name; + break; + case USI_VER2: + val = exynos_usi_modes[mode].val; + name = exynos_usi_modes[usi->mode].name; + break; + default: + return -EINVAL; + } + ret = regmap_update_bits(usi->sysreg, usi->sw_conf, usi->data->sw_conf_mask, val); + if (ret) return ret; - usi->mode = mode; - dev_dbg(usi->dev, "protocol: %s\n", exynos_usi_modes[usi->mode].name); + dev_dbg(usi->dev, "protocol: %s\n", name); return 0; }
USIv1 IP-core is found on some ARM64 Exynos SoCs (like Exynos8895) and provides selectable serial protocols (one of: HSI2C0, HSI2C1, HSI2C0_1, SPI, UART, UART_HSI2C1). USIv1, unlike USIv2, doesn't have any known register map. Underlying protocols that it implements have no offset, like with Exynos850. Desired protocol can be chosen via SW_CONF register from System Register block of the same domain as USI. In order to select a particular protocol, the protocol has to be selected via the System Register. Unlike USIv2, there's no need for any setup before the given protocol becomes accessible. Modify the existing driver in order to allow USIv1 to probe and set its protocol. Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com> --- drivers/soc/samsung/exynos-usi.c | 58 +++++++++++++++++++++++++++++--- 1 file changed, 54 insertions(+), 4 deletions(-)