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Date: Mon, 28 Apr 2014 14:29:58 +0530
From: Naveen Krishna Chatradhi <ch.naveen@...sung.com>
To: linux-i2c@...r.kernel.org
Cc: naveenkrishna.ch@...il.com, linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org, sjg@...omium.org,
linux-kernel@...r.kernel.org, wsa@...-dreams.de, cpgs@...sung.com,
broonie@...nel.org, t.figa@...sung.com
Subject: [PATCH] i2c: exynos5: add support for HSI2C on Exynos5260 SoC
HSI2C module on Exynos5260 differs from current modules in
following ways:
1. HSI2C on Exynos5260 has fifo_depth of 16bytes
2. Module needs to be reset as a part of init sequence.
Hence, Following changes are involved.
1. Add a new compatible string and Updates the Documentation dt bindings.
2. Introduce a variant struct to support the changes in H/W
3. Reset the module during init. Thus, bringing the module back
to default state irrespective of what firmware did with it.
Signed-off-by: Naveen Krishna Chatradhi <ich.naveen@...sung.com>
Signed-off-by: Pankaj Dubey <pankaj.dubey@...sung.com>
---
This patch is under review at https://lkml.org/lkml/2014/2/6/590
and https://lkml.org/lkml/2014/2/6/151
As per Wolfram's comments, both the patches were squashed here.
.../devicetree/bindings/i2c/i2c-exynos5.txt | 11 +++-
drivers/i2c/busses/i2c-exynos5.c | 67 ++++++++++++++++----
2 files changed, 64 insertions(+), 14 deletions(-)
diff --git a/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt b/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt
index 056732c..d4745e3 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt
@@ -5,7 +5,14 @@ at various speeds ranging from 100khz to 3.4Mhz.
Required properties:
- compatible: value should be.
- -> "samsung,exynos5-hsi2c", for i2c compatible with exynos5 hsi2c.
+ -> "samsung,exynos5-hsi2c", (DEPRECATED)
+ for i2c compatible with HSI2C available
+ on Exynos5250 and Exynos5420 SoCs.
+ -> "samsung,exynos5250-hsi2c", for i2c compatible with HSI2C available
+ on Exynos5250 and Exynos5420 SoCs.
+ -> "samsung,exynos5260-hsi2c", for i2c compatible with HSI2C available
+ on Exynos5260 SoCs.
+
- reg: physical base address of the controller and length of memory mapped
region.
- interrupts: interrupt number to the cpu.
@@ -26,7 +33,7 @@ Optional properties:
Example:
hsi2c@...a0000 {
- compatible = "samsung,exynos5-hsi2c";
+ compatible = "samsung,exynos5250-hsi2c";
reg = <0x12ca0000 0x100>;
interrupts = <56>;
clock-frequency = <100000>;
diff --git a/drivers/i2c/busses/i2c-exynos5.c b/drivers/i2c/busses/i2c-exynos5.c
index 00af0a0..043d6d8 100644
--- a/drivers/i2c/busses/i2c-exynos5.c
+++ b/drivers/i2c/busses/i2c-exynos5.c
@@ -76,12 +76,6 @@
#define HSI2C_RXFIFO_TRIGGER_LEVEL(x) ((x) << 4)
#define HSI2C_TXFIFO_TRIGGER_LEVEL(x) ((x) << 16)
-/* As per user manual FIFO max depth is 64bytes */
-#define HSI2C_FIFO_MAX 0x40
-/* default trigger levels for Tx and Rx FIFOs */
-#define HSI2C_DEF_TXFIFO_LVL (HSI2C_FIFO_MAX - 0x30)
-#define HSI2C_DEF_RXFIFO_LVL (HSI2C_FIFO_MAX - 0x10)
-
/* I2C_TRAILING_CTL Register bits */
#define HSI2C_TRAILING_COUNT (0xf)
@@ -183,14 +177,54 @@ struct exynos5_i2c {
* 2. Fast speed upto 1Mbps
*/
int speed_mode;
+
+ /* Version of HS-I2C Hardware */
+ struct exynos_hsi2c_variant *variant;
+};
+
+/**
+ * struct exynos_hsi2c_variant - platform specific HSI2C driver data
+ * @fifo_depth: the fifo depth supported by the HSI2C module
+ *
+ * Specifies platform specific configuration of HSI2C module.
+ * Note: A structure for driver specific platform data is used for future
+ * expansion of its usage.
+ */
+struct exynos_hsi2c_variant {
+ unsigned int fifo_depth;
+};
+
+static const struct exynos_hsi2c_variant exynos5250_hsi2c_data = {
+ .fifo_depth = 64,
+};
+
+static const struct exynos_hsi2c_variant exynos5260_hsi2c_data = {
+ .fifo_depth = 16,
};
static const struct of_device_id exynos5_i2c_match[] = {
- { .compatible = "samsung,exynos5-hsi2c" },
- {},
+ {
+ .compatible = "samsung,exynos5-hsi2c",
+ .data = &exynos5250_hsi2c_data
+ }, {
+ .compatible = "samsung,exynos5250-hsi2c",
+ .data = &exynos5250_hsi2c_data
+ }, {
+ .compatible = "samsung,exynos5260-hsi2c",
+ .data = &exynos5260_hsi2c_data
+ }, {},
};
MODULE_DEVICE_TABLE(of, exynos5_i2c_match);
+static inline struct exynos_hsi2c_variant *exynos5_i2c_get_variant
+ (struct platform_device *pdev)
+{
+ const struct of_device_id *match;
+
+ match = of_match_node(exynos5_i2c_match, pdev->dev.of_node);
+ return (struct exynos_hsi2c_variant *)match->data;
+}
+
static void exynos5_i2c_clr_pend_irq(struct exynos5_i2c *i2c)
{
writel(readl(i2c->regs + HSI2C_INT_STATUS),
@@ -415,7 +449,7 @@ static irqreturn_t exynos5_i2c_irq(int irqno, void *dev_id)
fifo_status = readl(i2c->regs + HSI2C_FIFO_STATUS);
fifo_level = HSI2C_TX_FIFO_LVL(fifo_status);
- len = HSI2C_FIFO_MAX - fifo_level;
+ len = i2c->variant->fifo_depth - fifo_level;
if (len > (i2c->msg->len - i2c->msg_ptr))
len = i2c->msg->len - i2c->msg_ptr;
@@ -483,6 +517,7 @@ static void exynos5_i2c_message_start(struct exynos5_i2c *i2c, int stop)
u32 i2c_auto_conf = 0;
u32 fifo_ctl;
unsigned long flags;
+ unsigned short trig_lvl;
i2c_ctl = readl(i2c->regs + HSI2C_CTL);
i2c_ctl &= ~(HSI2C_TXCHON | HSI2C_RXCHON);
@@ -493,13 +528,19 @@ static void exynos5_i2c_message_start(struct exynos5_i2c *i2c, int stop)
i2c_auto_conf = HSI2C_READ_WRITE;
- fifo_ctl |= HSI2C_RXFIFO_TRIGGER_LEVEL(HSI2C_DEF_TXFIFO_LVL);
+ trig_lvl = (i2c->msg->len > i2c->variant->fifo_depth) ?
+ (i2c->variant->fifo_depth * 3/4) : i2c->msg->len;
+ fifo_ctl |= HSI2C_RXFIFO_TRIGGER_LEVEL(trig_lvl);
+
int_en |= (HSI2C_INT_RX_ALMOSTFULL_EN |
HSI2C_INT_TRAILING_EN);
} else {
i2c_ctl |= HSI2C_TXCHON;
- fifo_ctl |= HSI2C_TXFIFO_TRIGGER_LEVEL(HSI2C_DEF_RXFIFO_LVL);
+ trig_lvl = (i2c->msg->len > i2c->variant->fifo_depth) ?
+ (i2c->variant->fifo_depth * 1/4) : i2c->msg->len;
+ fifo_ctl |= HSI2C_TXFIFO_TRIGGER_LEVEL(trig_lvl);
+
int_en |= HSI2C_INT_TX_ALMOSTEMPTY_EN;
}
@@ -691,7 +732,9 @@ static int exynos5_i2c_probe(struct platform_device *pdev)
if (ret)
goto err_clk;
- exynos5_i2c_init(i2c);
+ i2c->variant = exynos5_i2c_get_variant(pdev);
+
+ exynos5_i2c_reset(i2c);
ret = i2c_add_adapter(&i2c->adap);
if (ret < 0) {
--
1.7.9.5
--
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