From: vaibhav.hiremath@linaro.org (Vaibhav Hiremath)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH-V2 11/12] i2c: pxa: Add ILCR (tLow & tHigh) configuration support
Date: Mon, 15 Jun 2015 21:19:58 +0530 [thread overview]
Message-ID: <1434383399-2370-12-git-send-email-vaibhav.hiremath@linaro.org> (raw)
In-Reply-To: <1434383399-2370-1-git-send-email-vaibhav.hiremath@linaro.org>
With addition of PXA910 family of devices, the TWSI module supports
SCL clock adjustment using ILCR register.
This patch enables the control and configuration of ICLR through DT
properties,
i2c-sclk-high-time-ns:
SCLK high time (tHigh), for standard/fast/high speed mode
i2c-sclk-low-time-ns:
SCLK low time (tLow), for standard/fast/high speed mode
Note that in case of standard and fast mod, the tLow and tHigh counters
are same, and software will use tLow value.
Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
Signed-off-by: Jett.Zhou <jtzhou@marvell.com>
Signed-off-by: Yi Zhang <yizhang@marvell.com>
---
drivers/i2c/busses/i2c-pxa.c | 66 ++++++++++++++++++++++++++++++++++++++++----
1 file changed, 60 insertions(+), 6 deletions(-)
diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index 97f9c7c..03b70f8 100644
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -195,6 +195,9 @@ struct pxa_i2c {
unsigned long rate;
bool highmode_enter;
bool disable_after_xfer;
+
+ unsigned int sclk_thigh_load_cnt;
+ unsigned int sclk_tlow_load_cnt;
};
#define _IBMR(i2c) ((i2c)->reg_ibmr)
@@ -507,6 +510,33 @@ static void i2c_pxa_set_slave(struct pxa_i2c *i2c, int errcode)
#define i2c_pxa_set_slave(i2c, err) do { } while (0)
#endif
+static void i2c_pxa_do_sclk_adj(struct pxa_i2c *i2c)
+{
+ unsigned int reg_ilcr;
+
+ reg_ilcr = readl(_ILCR(i2c));
+
+ /* For standard/fast mode tlow and thigh counters are same */
+ if (i2c->sclk_tlow_load_cnt) {
+ unsigned int mask, shift;
+
+ mask = i2c->high_mode ? ILCR_HLVL_MASK :
+ i2c->fast_mode ? ILCR_FLV_MASK : ILCR_SLV_MASK;
+ shift = i2c->high_mode ? ILCR_HLVL_SHIFT :
+ i2c->fast_mode ? ILCR_FLV_SHIFT : ILCR_SLV_SHIFT;
+
+ reg_ilcr &= ~mask;
+ reg_ilcr |= i2c->sclk_tlow_load_cnt << shift;
+ }
+
+ if (i2c->high_mode && i2c->sclk_thigh_load_cnt) {
+ reg_ilcr &= ~ILCR_HLVH_MASK;
+ reg_ilcr |= i2c->sclk_thigh_load_cnt << ILCR_HLVH_SHIFT;
+ }
+
+ writel(reg_ilcr, _ILCR(i2c));
+}
+
static void i2c_pxa_reset(struct pxa_i2c *i2c)
{
pr_debug("Resetting I2C Controller Unit\n");
@@ -526,6 +556,8 @@ static void i2c_pxa_reset(struct pxa_i2c *i2c)
writel(I2C_ICR_INIT | (i2c->fast_mode ? ICR_FM : 0), _ICR(i2c));
writel(readl(_ICR(i2c)) | (i2c->high_mode ? ICR_HS : 0), _ICR(i2c));
+ i2c_pxa_do_sclk_adj(i2c);
+
#ifdef CONFIG_I2C_PXA_SLAVE
dev_info(&i2c->adap.dev, "Enabling slave mode\n");
writel(readl(_ICR(i2c)) | ICR_SADIE | ICR_ALDIE | ICR_SSDIE, _ICR(i2c));
@@ -1204,6 +1236,26 @@ static int i2c_pxa_probe_dt(struct platform_device *pdev, struct pxa_i2c *i2c,
*i2c_types = (long)(of_id->data);
+ /* optional properties */
+ if (of_device_is_compatible(np, "mrvl,mmp-twsi")) {
+ unsigned int tlow = 0, thigh = 0;
+ unsigned int clk_ns;
+
+ /* clock time in nsec */
+ clk_ns = 1000000 / (i2c->rate / 1000);
+
+ of_property_read_u32(np, "i2c-sclk-high-time-ns", &thigh);
+ i2c->sclk_thigh_load_cnt = thigh / clk_ns;
+
+ of_property_read_u32(np, "i2c-sclk-low-time-ns", &tlow);
+ i2c->sclk_tlow_load_cnt = tlow / clk_ns;
+
+ /* For std/fast mode tlow & thigh have same bit-fields */
+ if (!i2c->high_mode &&
+ (i2c->sclk_tlow_load_cnt != i2c->sclk_thigh_load_cnt))
+ dev_warn(&i2c->adap.dev,
+ "mismatch of tLow & tHigh values, using tLow\n");
+ }
return 0;
}
@@ -1253,6 +1305,14 @@ static int i2c_pxa_probe(struct platform_device *dev)
return irq;
}
+ i2c->clk = devm_clk_get(&dev->dev, NULL);
+ if (IS_ERR(i2c->clk)) {
+ dev_err(&dev->dev, "failed to get the clk\n");
+ return PTR_ERR(i2c->clk);
+ }
+
+ i2c->rate = clk_get_rate(i2c->clk);
+
/* Default adapter num to device id; i2c_pxa_probe_dt can override. */
i2c->adap.nr = dev->id;
@@ -1270,12 +1330,6 @@ static int i2c_pxa_probe(struct platform_device *dev)
strlcpy(i2c->adap.name, "pxa_i2c-i2c", sizeof(i2c->adap.name));
- i2c->clk = devm_clk_get(&dev->dev, NULL);
- if (IS_ERR(i2c->clk)) {
- dev_err(&dev->dev, "failed to get the clk\n");
- return PTR_ERR(i2c->clk);
- }
-
i2c->reg_base = devm_ioremap_resource(&dev->dev, res);
if (IS_ERR(i2c->reg_base)) {
dev_err(&dev->dev, "failed to map resource: %ld\n",
--
1.9.1
WARNING: multiple messages have this Message-ID (diff)
From: Vaibhav Hiremath <vaibhav.hiremath-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
To: linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org,
robert.jarzmik-GANU6spQydw@public.gmane.org,
Vaibhav Hiremath
<vaibhav.hiremath-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
"Jett.Zhou" <jtzhou-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>,
Yi Zhang <yizhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>
Subject: [PATCH-V2 11/12] i2c: pxa: Add ILCR (tLow & tHigh) configuration support
Date: Mon, 15 Jun 2015 21:19:58 +0530 [thread overview]
Message-ID: <1434383399-2370-12-git-send-email-vaibhav.hiremath@linaro.org> (raw)
In-Reply-To: <1434383399-2370-1-git-send-email-vaibhav.hiremath-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
With addition of PXA910 family of devices, the TWSI module supports
SCL clock adjustment using ILCR register.
This patch enables the control and configuration of ICLR through DT
properties,
i2c-sclk-high-time-ns:
SCLK high time (tHigh), for standard/fast/high speed mode
i2c-sclk-low-time-ns:
SCLK low time (tLow), for standard/fast/high speed mode
Note that in case of standard and fast mod, the tLow and tHigh counters
are same, and software will use tLow value.
Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Signed-off-by: Jett.Zhou <jtzhou-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>
Signed-off-by: Yi Zhang <yizhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>
---
drivers/i2c/busses/i2c-pxa.c | 66 ++++++++++++++++++++++++++++++++++++++++----
1 file changed, 60 insertions(+), 6 deletions(-)
diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index 97f9c7c..03b70f8 100644
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -195,6 +195,9 @@ struct pxa_i2c {
unsigned long rate;
bool highmode_enter;
bool disable_after_xfer;
+
+ unsigned int sclk_thigh_load_cnt;
+ unsigned int sclk_tlow_load_cnt;
};
#define _IBMR(i2c) ((i2c)->reg_ibmr)
@@ -507,6 +510,33 @@ static void i2c_pxa_set_slave(struct pxa_i2c *i2c, int errcode)
#define i2c_pxa_set_slave(i2c, err) do { } while (0)
#endif
+static void i2c_pxa_do_sclk_adj(struct pxa_i2c *i2c)
+{
+ unsigned int reg_ilcr;
+
+ reg_ilcr = readl(_ILCR(i2c));
+
+ /* For standard/fast mode tlow and thigh counters are same */
+ if (i2c->sclk_tlow_load_cnt) {
+ unsigned int mask, shift;
+
+ mask = i2c->high_mode ? ILCR_HLVL_MASK :
+ i2c->fast_mode ? ILCR_FLV_MASK : ILCR_SLV_MASK;
+ shift = i2c->high_mode ? ILCR_HLVL_SHIFT :
+ i2c->fast_mode ? ILCR_FLV_SHIFT : ILCR_SLV_SHIFT;
+
+ reg_ilcr &= ~mask;
+ reg_ilcr |= i2c->sclk_tlow_load_cnt << shift;
+ }
+
+ if (i2c->high_mode && i2c->sclk_thigh_load_cnt) {
+ reg_ilcr &= ~ILCR_HLVH_MASK;
+ reg_ilcr |= i2c->sclk_thigh_load_cnt << ILCR_HLVH_SHIFT;
+ }
+
+ writel(reg_ilcr, _ILCR(i2c));
+}
+
static void i2c_pxa_reset(struct pxa_i2c *i2c)
{
pr_debug("Resetting I2C Controller Unit\n");
@@ -526,6 +556,8 @@ static void i2c_pxa_reset(struct pxa_i2c *i2c)
writel(I2C_ICR_INIT | (i2c->fast_mode ? ICR_FM : 0), _ICR(i2c));
writel(readl(_ICR(i2c)) | (i2c->high_mode ? ICR_HS : 0), _ICR(i2c));
+ i2c_pxa_do_sclk_adj(i2c);
+
#ifdef CONFIG_I2C_PXA_SLAVE
dev_info(&i2c->adap.dev, "Enabling slave mode\n");
writel(readl(_ICR(i2c)) | ICR_SADIE | ICR_ALDIE | ICR_SSDIE, _ICR(i2c));
@@ -1204,6 +1236,26 @@ static int i2c_pxa_probe_dt(struct platform_device *pdev, struct pxa_i2c *i2c,
*i2c_types = (long)(of_id->data);
+ /* optional properties */
+ if (of_device_is_compatible(np, "mrvl,mmp-twsi")) {
+ unsigned int tlow = 0, thigh = 0;
+ unsigned int clk_ns;
+
+ /* clock time in nsec */
+ clk_ns = 1000000 / (i2c->rate / 1000);
+
+ of_property_read_u32(np, "i2c-sclk-high-time-ns", &thigh);
+ i2c->sclk_thigh_load_cnt = thigh / clk_ns;
+
+ of_property_read_u32(np, "i2c-sclk-low-time-ns", &tlow);
+ i2c->sclk_tlow_load_cnt = tlow / clk_ns;
+
+ /* For std/fast mode tlow & thigh have same bit-fields */
+ if (!i2c->high_mode &&
+ (i2c->sclk_tlow_load_cnt != i2c->sclk_thigh_load_cnt))
+ dev_warn(&i2c->adap.dev,
+ "mismatch of tLow & tHigh values, using tLow\n");
+ }
return 0;
}
@@ -1253,6 +1305,14 @@ static int i2c_pxa_probe(struct platform_device *dev)
return irq;
}
+ i2c->clk = devm_clk_get(&dev->dev, NULL);
+ if (IS_ERR(i2c->clk)) {
+ dev_err(&dev->dev, "failed to get the clk\n");
+ return PTR_ERR(i2c->clk);
+ }
+
+ i2c->rate = clk_get_rate(i2c->clk);
+
/* Default adapter num to device id; i2c_pxa_probe_dt can override. */
i2c->adap.nr = dev->id;
@@ -1270,12 +1330,6 @@ static int i2c_pxa_probe(struct platform_device *dev)
strlcpy(i2c->adap.name, "pxa_i2c-i2c", sizeof(i2c->adap.name));
- i2c->clk = devm_clk_get(&dev->dev, NULL);
- if (IS_ERR(i2c->clk)) {
- dev_err(&dev->dev, "failed to get the clk\n");
- return PTR_ERR(i2c->clk);
- }
-
i2c->reg_base = devm_ioremap_resource(&dev->dev, res);
if (IS_ERR(i2c->reg_base)) {
dev_err(&dev->dev, "failed to map resource: %ld\n",
--
1.9.1
next prev parent reply other threads:[~2015-06-15 15:49 UTC|newest]
Thread overview: 125+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <vaibhav.hiremath@linaro.org>
2015-06-02 18:45 ` [PATCH-RESEND 0/3] i2c: core/pxa: Add support for hardware lock Vaibhav Hiremath
2015-06-02 18:45 ` Vaibhav Hiremath
2015-06-02 18:45 ` [PATCH-RESEND 1/3] i2c: core: append hardware lock with bus lock Vaibhav Hiremath
2015-06-02 18:45 ` Vaibhav Hiremath
2015-06-02 18:45 ` [PATCH-RESEND 2/3] i2c: pxa: Add support for hardware lock Vaibhav Hiremath
2015-06-02 18:45 ` Vaibhav Hiremath
2015-06-02 18:45 ` [PATCH-RESEND 3/3] i2c: pxa: Add pin ctrl support for CP core access Vaibhav Hiremath
2015-06-02 18:45 ` Vaibhav Hiremath
2015-06-16 8:28 ` [PATCH-RESEND 0/3] i2c: core/pxa: Add support for hardware lock Vaibhav Hiremath
2015-06-16 8:28 ` Vaibhav Hiremath
2015-07-07 6:43 ` Vaibhav Hiremath
2015-07-07 6:43 ` Vaibhav Hiremath
2015-10-25 9:52 ` Wolfram Sang
2015-10-25 9:52 ` Wolfram Sang
2015-06-15 15:49 ` [PATCH-V2 00/12] i2c: pxa: Fixes, cleanup and support for pxa910 family Vaibhav Hiremath
2015-06-15 15:49 ` Vaibhav Hiremath
2015-06-15 15:49 ` [PATCH-V2 01/12] i2c: pxa: keep i2c irq ON in suspend Vaibhav Hiremath
2015-06-15 15:49 ` Vaibhav Hiremath
2015-06-15 15:49 ` [PATCH-V2 02/12] i2c: pxa: No need to set slave addr for i2c master mode reset Vaibhav Hiremath
2015-06-15 15:49 ` Vaibhav Hiremath
2015-07-03 20:58 ` Robert Jarzmik
2015-07-03 20:58 ` Robert Jarzmik
2015-06-15 15:49 ` [PATCH-V2 03/12] i2c: pxa: Return I2C_RETRY when timeout in pio mode Vaibhav Hiremath
2015-06-15 15:49 ` Vaibhav Hiremath
2015-06-16 5:31 ` Shubhrajyoti Datta
2015-06-16 5:31 ` Shubhrajyoti Datta
2015-06-16 7:41 ` Vaibhav Hiremath
2015-06-16 7:41 ` Vaibhav Hiremath
2015-07-03 21:07 ` Robert Jarzmik
2015-07-03 21:07 ` Robert Jarzmik
2015-06-15 15:49 ` [PATCH-V2 04/12] i2c: pxa: Reset i2c controller on timeout in interrupt and " Vaibhav Hiremath
2015-06-15 15:49 ` Vaibhav Hiremath
2015-07-03 15:27 ` Robert Jarzmik
2015-07-03 15:27 ` Robert Jarzmik
2015-07-03 18:13 ` Vaibhav Hiremath
2015-07-03 18:13 ` Vaibhav Hiremath
2015-06-15 15:49 ` [PATCH-V2 05/12] i2c: pxa: Remove compile warnning in 64bit mode Vaibhav Hiremath
2015-06-15 15:49 ` Vaibhav Hiremath
2015-06-15 15:49 ` [PATCH-V2 06/12] i2c: pxa: Update debug function to dump more info on error Vaibhav Hiremath
2015-06-15 15:49 ` Vaibhav Hiremath
2015-06-15 15:49 ` [PATCH-V2 07/12] i2c:pxa: Use devm_ variants in probe function Vaibhav Hiremath
2015-06-15 15:49 ` Vaibhav Hiremath
2015-07-03 15:28 ` Robert Jarzmik
2015-07-03 15:28 ` Robert Jarzmik
2015-07-03 18:14 ` Vaibhav Hiremath
2015-07-03 18:14 ` Vaibhav Hiremath
2015-06-15 15:49 ` [PATCH-V2 08/12] i2c: pxa: enable/disable i2c module across msg xfer Vaibhav Hiremath
2015-06-15 15:49 ` Vaibhav Hiremath
2015-07-03 15:28 ` Robert Jarzmik
2015-07-03 15:28 ` Robert Jarzmik
2015-07-03 18:23 ` Vaibhav Hiremath
2015-07-03 18:23 ` Vaibhav Hiremath
2015-07-03 18:48 ` Vaibhav Hiremath
2015-07-03 18:48 ` Vaibhav Hiremath
2015-07-03 19:44 ` Robert Jarzmik
2015-07-03 19:44 ` Robert Jarzmik
2015-06-15 15:49 ` [PATCH-V2 09/12] Documentation: binding: add new property 'disable_after_xfer' to i2c-pxa Vaibhav Hiremath
2015-06-15 15:49 ` Vaibhav Hiremath
2015-06-15 15:49 ` [PATCH-V2 10/12] i2c: pxa: Add support for pxa910/988 & new configuration features Vaibhav Hiremath
2015-06-15 15:49 ` Vaibhav Hiremath
2015-06-15 15:49 ` Vaibhav Hiremath [this message]
2015-06-15 15:49 ` [PATCH-V2 11/12] i2c: pxa: Add ILCR (tLow & tHigh) configuration support Vaibhav Hiremath
2015-07-03 15:28 ` Robert Jarzmik
2015-07-03 15:28 ` Robert Jarzmik
2015-07-03 18:17 ` Vaibhav Hiremath
2015-07-03 18:17 ` Vaibhav Hiremath
2015-06-15 15:49 ` [PATCH-V2 12/12] Documentation: binding: add sclk adjustment properties to i2c-pxa Vaibhav Hiremath
2015-06-15 15:49 ` Vaibhav Hiremath
2015-06-16 13:22 ` Rob Herring
2015-06-16 13:22 ` Rob Herring
2015-06-16 14:25 ` Vaibhav Hiremath
2015-06-16 14:25 ` Vaibhav Hiremath
2015-06-29 8:52 ` [PATCH-V2 00/12] i2c: pxa: Fixes, cleanup and support for pxa910 family Vaibhav Hiremath
2015-06-29 8:52 ` Vaibhav Hiremath
2015-07-02 16:54 ` Vaibhav Hiremath
2015-07-02 16:54 ` Vaibhav Hiremath
2015-06-17 18:58 [PATCH-v2 0/3] mfd: 88pm800: Add Device tree support Vaibhav Hiremath
2015-06-17 18:58 ` Vaibhav Hiremath
2015-06-17 18:58 ` [rtc-linux] " Vaibhav Hiremath
2015-06-17 18:58 ` [PATCH-v2 1/3] mfd: 88pm800: Add device " Vaibhav Hiremath
2015-06-17 18:58 ` Vaibhav Hiremath
2015-06-17 18:58 ` [rtc-linux] " Vaibhav Hiremath
2015-06-17 18:58 ` Vaibhav Hiremath
2015-06-17 18:58 ` [PATCH-v2] rtc: 88pm80x: add " Vaibhav Hiremath
2015-06-17 18:58 ` Vaibhav Hiremath
2015-06-17 18:58 ` [rtc-linux] " Vaibhav Hiremath
2015-06-20 0:43 ` Alexandre Belloni
2015-06-20 0:43 ` Alexandre Belloni
2015-06-20 0:43 ` Alexandre Belloni
2015-06-20 0:43 ` Alexandre Belloni
2015-06-25 7:46 ` Vaibhav Hiremath
2015-06-25 7:46 ` Vaibhav Hiremath
2015-06-25 7:46 ` Vaibhav Hiremath
2015-06-25 7:46 ` Vaibhav Hiremath
2015-07-07 6:37 ` Vaibhav Hiremath
2015-07-07 6:37 ` Vaibhav Hiremath
2015-07-07 6:37 ` Vaibhav Hiremath
2015-07-07 6:37 ` Vaibhav Hiremath
2015-06-17 18:58 ` [PATCH-v2 2/3] mfd: 88pm800: Allow configuration of interrupt clear method Vaibhav Hiremath
2015-06-17 18:58 ` Vaibhav Hiremath
2015-06-17 18:58 ` [rtc-linux] " Vaibhav Hiremath
2015-06-17 18:58 ` Vaibhav Hiremath
2015-06-17 18:58 ` [PATCH-v2 3/3] mfd: devicetree: bindings: Add new 88pm800 mfd binding Vaibhav Hiremath
2015-06-17 18:58 ` Vaibhav Hiremath
2015-06-17 18:58 ` [rtc-linux] " Vaibhav Hiremath
2015-06-17 18:58 ` Vaibhav Hiremath
2015-06-23 15:37 ` Rob Herring
2015-06-23 15:37 ` Rob Herring
2015-06-23 15:37 ` [rtc-linux] " Rob Herring
2015-06-23 15:37 ` Rob Herring
2015-06-23 17:02 ` Vaibhav Hiremath
2015-06-23 17:02 ` Vaibhav Hiremath
2015-06-23 17:02 ` [rtc-linux] " Vaibhav Hiremath
2015-06-24 0:29 ` Krzysztof Kozlowski
2015-06-24 0:29 ` Krzysztof Kozlowski
2015-06-24 0:29 ` [rtc-linux] " Krzysztof Kozlowski
2015-06-24 0:29 ` Krzysztof Kozlowski
2015-06-24 5:19 ` Vaibhav Hiremath
2015-06-24 5:19 ` Vaibhav Hiremath
2015-06-24 5:19 ` [rtc-linux] " Vaibhav Hiremath
2015-06-24 5:19 ` Vaibhav Hiremath
2015-06-23 5:07 ` [PATCH-v2 0/3] mfd: 88pm800: Add Device tree support Vaibhav Hiremath
2015-06-23 5:07 ` Vaibhav Hiremath
2015-06-23 5:07 ` [rtc-linux] " Vaibhav Hiremath
2015-06-23 5:07 ` Vaibhav Hiremath
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