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path: root/drivers/soc/samsung/exynos-usi.c
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Diffstat (limited to 'drivers/soc/samsung/exynos-usi.c')
-rw-r--r--drivers/soc/samsung/exynos-usi.c108
1 files changed, 89 insertions, 19 deletions
diff --git a/drivers/soc/samsung/exynos-usi.c b/drivers/soc/samsung/exynos-usi.c
index 114352695ac2..5f7bdf3bab05 100644
--- a/drivers/soc/samsung/exynos-usi.c
+++ b/drivers/soc/samsung/exynos-usi.c
@@ -6,6 +6,7 @@
* Samsung Exynos USI driver (Universal Serial Interface).
*/
+#include <linux/array_size.h>
#include <linux/clk.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
@@ -16,6 +17,18 @@
#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 +47,8 @@
#define USI_OPTION_CLKSTOP_ON BIT(2)
enum exynos_usi_ver {
- USI_VER2 = 2,
+ USI_VER1 = 0,
+ USI_VER2,
};
struct exynos_usi_variant {
@@ -66,19 +80,39 @@ struct exynos_usi_mode {
unsigned int val; /* mode register value */
};
-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 },
- [USI_V2_SPI] = { .name = "spi", .val = USI_V2_SW_CONF_SPI },
- [USI_V2_I2C] = { .name = "i2c", .val = USI_V2_SW_CONF_I2C },
+#define USI_MODES_MAX (USI_MODE_UART_I2C1 + 1)
+static const struct exynos_usi_mode exynos_usi_modes[][USI_MODES_MAX] = {
+ [USI_VER1] = {
+ [USI_MODE_NONE] = { .name = "none", .val = USI_V1_SW_CONF_NONE },
+ [USI_MODE_UART] = { .name = "uart", .val = USI_V1_SW_CONF_UART },
+ [USI_MODE_SPI] = { .name = "spi", .val = USI_V1_SW_CONF_SPI },
+ [USI_MODE_I2C] = { .name = "i2c", .val = USI_V1_SW_CONF_I2C0 },
+ [USI_MODE_I2C1] = { .name = "i2c1", .val = USI_V1_SW_CONF_I2C1 },
+ [USI_MODE_I2C0_1] = { .name = "i2c0_1", .val = USI_V1_SW_CONF_I2C0_1 },
+ [USI_MODE_UART_I2C1] = { .name = "uart_i2c1", .val = USI_V1_SW_CONF_UART_I2C1 },
+ }, [USI_VER2] = {
+ [USI_MODE_NONE] = { .name = "none", .val = USI_V2_SW_CONF_NONE },
+ [USI_MODE_UART] = { .name = "uart", .val = USI_V2_SW_CONF_UART },
+ [USI_MODE_SPI] = { .name = "spi", .val = USI_V2_SW_CONF_SPI },
+ [USI_MODE_I2C] = { .name = "i2c", .val = USI_V2_SW_CONF_I2C },
+ },
};
static const char * const exynos850_usi_clk_names[] = { "pclk", "ipclk" };
static const struct exynos_usi_variant exynos850_usi_data = {
.ver = USI_VER2,
.sw_conf_mask = USI_V2_SW_CONF_MASK,
- .min_mode = USI_V2_NONE,
- .max_mode = USI_V2_I2C,
+ .min_mode = USI_MODE_NONE,
+ .max_mode = USI_MODE_I2C,
+ .num_clks = ARRAY_SIZE(exynos850_usi_clk_names),
+ .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_MODE_NONE,
+ .max_mode = USI_MODE_UART_I2C1,
.num_clks = ARRAY_SIZE(exynos850_usi_clk_names),
.clk_names = exynos850_usi_clk_names,
};
@@ -87,6 +121,9 @@ 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 */
};
@@ -109,14 +146,15 @@ static int exynos_usi_set_sw_conf(struct exynos_usi *usi, size_t mode)
if (mode < usi->data->min_mode || mode > usi->data->max_mode)
return -EINVAL;
- val = exynos_usi_modes[mode].val;
+ val = exynos_usi_modes[usi->data->ver][mode].val;
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",
+ exynos_usi_modes[usi->data->ver][usi->mode].name);
return 0;
}
@@ -168,10 +206,42 @@ static int exynos_usi_configure(struct exynos_usi *usi)
if (ret)
return ret;
- if (usi->data->ver == USI_VER2)
- return exynos_usi_enable(usi);
+ if (usi->data->ver == USI_VER1)
+ ret = clk_bulk_prepare_enable(usi->data->num_clks,
+ usi->clks);
+ else if (usi->data->ver == USI_VER2)
+ ret = exynos_usi_enable(usi);
- return 0;
+ return ret;
+}
+
+static void exynos_usi_unconfigure(void *data)
+{
+ struct exynos_usi *usi = data;
+ u32 val;
+ int ret;
+
+ if (usi->data->ver == USI_VER1) {
+ clk_bulk_disable_unprepare(usi->data->num_clks, usi->clks);
+ return;
+ }
+
+ ret = clk_bulk_prepare_enable(usi->data->num_clks, usi->clks);
+ if (ret)
+ return;
+
+ /* Make sure that we've stopped providing the clock to USI IP */
+ val = readl(usi->regs + USI_OPTION);
+ val &= ~USI_OPTION_CLKREQ_ON;
+ val |= USI_OPTION_CLKSTOP_ON;
+ writel(val, usi->regs + USI_OPTION);
+
+ /* Set USI block state to reset */
+ val = readl(usi->regs + USI_CON);
+ val |= USI_CON_RESET;
+ writel(val, usi->regs + USI_CON);
+
+ clk_bulk_disable_unprepare(usi->data->num_clks, usi->clks);
}
static int exynos_usi_parse_dt(struct device_node *np, struct exynos_usi *usi)
@@ -186,15 +256,11 @@ static int exynos_usi_parse_dt(struct device_node *np, struct exynos_usi *usi)
return -EINVAL;
usi->mode = mode;
- usi->sysreg = syscon_regmap_lookup_by_phandle(np, "samsung,sysreg");
+ usi->sysreg = syscon_regmap_lookup_by_phandle_args(np, "samsung,sysreg",
+ 1, &usi->sw_conf);
if (IS_ERR(usi->sysreg))
return PTR_ERR(usi->sysreg);
- ret = of_property_read_u32_index(np, "samsung,sysreg", 1,
- &usi->sw_conf);
- if (ret)
- return ret;
-
usi->clkreq_on = of_property_read_bool(np, "samsung,clkreq-on");
return 0;
@@ -255,6 +321,10 @@ static int exynos_usi_probe(struct platform_device *pdev)
if (ret)
return ret;
+ ret = devm_add_action_or_reset(&pdev->dev, exynos_usi_unconfigure, usi);
+ if (ret)
+ return ret;
+
/* Make it possible to embed protocol nodes into USI np */
return of_platform_populate(np, NULL, NULL, dev);
}
generated by cgit (git 2.34.1) at 2025-07-23 18:32:21 +0000