[PATCH 0/3] drivers: i2c: thunderx: Marvell thunderx i2c changes

[PATCH 0/3] drivers: i2c: thunderx: Marvell thunderx i2c changes

[Piyush Malgujar]

These patches includes the following changes:

- Handling clock divisor logic for Octeon SoC family using subsytem ID
- Support for high speed mode
- Setting the fwnode so that driver can work with ACPI defined TWSI
  controllers.

Piyush Malgujar (3):
  drivers: i2c: thunderx: octeontx2 clock divisor logic changes
  drivers: i2c: thunderx: Add support for High speed mode
  drivers: i2c: thunderx: Allow driver to work with ACPI defined TWSI 	
    	controllers

 drivers/i2c/busses/i2c-octeon-core.c     | 84 +++++++++++++++++-------
 drivers/i2c/busses/i2c-octeon-core.h     | 17 +++++
 drivers/i2c/busses/i2c-thunderx-pcidrv.c |  8 +++
 3 files changed, 85 insertions(+), 24 deletions(-)

-- 
2.17.1

[PATCH 1/3] drivers: i2c: thunderx: octeontx2 clock divisor logic changes

[Piyush Malgujar]

Handle changes to clock divisor logic for OcteonTX2 SoC family using
subsystem ID and using default reference clock source as 100MHz.

Signed-off-by: Suneel Garapati <sgarapati@marvell.com>
Signed-off-by: Piyush Malgujar <pmalgujar@marvell.com>
---
 drivers/i2c/busses/i2c-octeon-core.c     | 24 +++++++++++++++++++++---
 drivers/i2c/busses/i2c-octeon-core.h     | 14 ++++++++++++++
 drivers/i2c/busses/i2c-thunderx-pcidrv.c |  6 ++++++
 3 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/busses/i2c-octeon-core.c b/drivers/i2c/busses/i2c-octeon-core.c
index 845eda70b8cab52a0453c9f4cb545010fba4305d..49d07a63a01f0b0711f4fa7a5d13d684935e5cbc 100644
--- a/drivers/i2c/busses/i2c-octeon-core.c
+++ b/drivers/i2c/busses/i2c-octeon-core.c
@@ -17,6 +17,7 @@
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/pci.h>
 
 #include "i2c-octeon-core.h"
 
@@ -658,7 +659,16 @@ int octeon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
 void octeon_i2c_set_clock(struct octeon_i2c *i2c)
 {
 	int tclk, thp_base, inc, thp_idx, mdiv_idx, ndiv_idx, foscl, diff;
-	int thp = 0x18, mdiv = 2, ndiv = 0, delta_hz = 1000000;
+	/* starting value on search for lowest diff */
+	const int huge_delta = 1000000;
+	/*
+	 * Find divisors to produce target frequency, start with large delta
+	 * to cover wider range of divisors, note thp = TCLK half period.
+	 */
+	int thp = 0x18, mdiv = 2, ndiv = 0, delta_hz = huge_delta;
+
+	if (octeon_i2c_is_otx2(to_pci_dev(i2c->dev)))
+		thp = 0x3;
 
 	for (ndiv_idx = 0; ndiv_idx < 8 && delta_hz != 0; ndiv_idx++) {
 		/*
@@ -672,17 +682,25 @@ void octeon_i2c_set_clock(struct octeon_i2c *i2c)
 			 */
 			tclk = i2c->twsi_freq * (mdiv_idx + 1) * 10;
 			tclk *= (1 << ndiv_idx);
-			thp_base = (i2c->sys_freq / (tclk * 2)) - 1;
+			if (octeon_i2c_is_otx2(to_pci_dev(i2c->dev)))
+				thp_base = (i2c->sys_freq / tclk) - 2;
+			else
+				thp_base = (i2c->sys_freq / (tclk * 2)) - 1;
 
 			for (inc = 0; inc <= 1; inc++) {
 				thp_idx = thp_base + inc;
 				if (thp_idx < 5 || thp_idx > 0xff)
 					continue;
 
-				foscl = i2c->sys_freq / (2 * (thp_idx + 1));
+				if (octeon_i2c_is_otx2(to_pci_dev(i2c->dev)))
+					foscl = i2c->sys_freq / (thp_idx + 2);
+				else
+					foscl = i2c->sys_freq /
+						(2 * (thp_idx + 1));
 				foscl = foscl / (1 << ndiv_idx);
 				foscl = foscl / (mdiv_idx + 1) / 10;
 				diff = abs(foscl - i2c->twsi_freq);
+				/* Use it if smaller diff from target */
 				if (diff < delta_hz) {
 					delta_hz = diff;
 					thp = thp_idx;
diff --git a/drivers/i2c/busses/i2c-octeon-core.h b/drivers/i2c/busses/i2c-octeon-core.h
index 9bb9f64fdda0392364638ecbaafe3fab5612baf6..15d379bf1d3cbba78378edfb6d45415a31ab4072 100644
--- a/drivers/i2c/busses/i2c-octeon-core.h
+++ b/drivers/i2c/busses/i2c-octeon-core.h
@@ -211,6 +211,20 @@ static inline void octeon_i2c_write_int(struct octeon_i2c *i2c, u64 data)
 	octeon_i2c_writeq_flush(data, i2c->twsi_base + TWSI_INT(i2c));
 }
 
+#define PCI_SUBSYS_DEVID_9XXX 0xB
+/**
+ * octeon_i2c_is_otx2 - check for chip ID
+ * @pdev: PCI dev structure
+ *
+ * Returns TRUE if OcteonTX2, FALSE otherwise.
+ */
+static inline bool octeon_i2c_is_otx2(struct pci_dev *pdev)
+{
+	u32 chip_id = (pdev->subsystem_device >> 12) & 0xF;
+
+	return (chip_id == PCI_SUBSYS_DEVID_9XXX);
+}
+
 /* Prototypes */
 irqreturn_t octeon_i2c_isr(int irq, void *dev_id);
 int octeon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num);
diff --git a/drivers/i2c/busses/i2c-thunderx-pcidrv.c b/drivers/i2c/busses/i2c-thunderx-pcidrv.c
index 12c90aa0900e60b63e0a14215f3692c12876c9cf..9fd903196b6cf967cde321da04f8d0526d84cc2f 100644
--- a/drivers/i2c/busses/i2c-thunderx-pcidrv.c
+++ b/drivers/i2c/busses/i2c-thunderx-pcidrv.c
@@ -205,6 +205,12 @@ static int thunder_i2c_probe_pci(struct pci_dev *pdev,
 	if (ret)
 		goto error;
 
+	/*
+	 * For OcteonTX2 chips, set reference frequency to 100MHz
+	 * as refclk_src in TWSI_MODE register defaults to 100MHz.
+	 */
+	if (octeon_i2c_is_otx2(pdev))
+		i2c->sys_freq = 100000000;
 	octeon_i2c_set_clock(i2c);
 
 	i2c->adap = thunderx_i2c_ops;
-- 
2.17.1

Re: [PATCH 1/3] drivers: i2c: thunderx: octeontx2 clock divisor logic changes

[kernel test robot]

Hi Piyush,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on wsa/i2c/for-next]
[also build test ERROR on linux/master linus/master v5.18-rc7 next-20220516]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/Piyush-Malgujar/drivers-i2c-thunderx-Marvell-thunderx-i2c-changes/20220511-213853
base:   https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/for-next
config: mips-randconfig-r025-20220516 (https://download.01.org/0day-ci/archive/20220517/202205170856.ko6UxqWi-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 853fa8ee225edf2d0de94b0dcbd31bea916e825e)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/56654d280f7c130d4f1d78eb8a3fa57fedc86b7b
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Piyush-Malgujar/drivers-i2c-thunderx-Marvell-thunderx-i2c-changes/20220511-213853
        git checkout 56654d280f7c130d4f1d78eb8a3fa57fedc86b7b
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from drivers/i2c/busses/i2c-octeon-platdrv.c:27:
>> drivers/i2c/busses/i2c-octeon-core.h:223:21: error: incomplete definition of type 'struct pci_dev'
           u32 chip_id = (pdev->subsystem_device >> 12) & 0xF;
                          ~~~~^
   include/asm-generic/pci_iomap.h:10:8: note: forward declaration of 'struct pci_dev'
   struct pci_dev;
          ^
   1 error generated.


vim +223 drivers/i2c/busses/i2c-octeon-core.h

   213	
   214	#define PCI_SUBSYS_DEVID_9XXX 0xB
   215	/**
   216	 * octeon_i2c_is_otx2 - check for chip ID
   217	 * @pdev: PCI dev structure
   218	 *
   219	 * Returns TRUE if OcteonTX2, FALSE otherwise.
   220	 */
   221	static inline bool octeon_i2c_is_otx2(struct pci_dev *pdev)
   222	{
 > 223		u32 chip_id = (pdev->subsystem_device >> 12) & 0xF;
   224	
   225		return (chip_id == PCI_SUBSYS_DEVID_9XXX);
   226	}
   227	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

Re: [PATCH 1/3] drivers: i2c: thunderx: octeontx2 clock divisor logic changes

[Wolfram Sang]

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>    In file included from drivers/i2c/busses/i2c-octeon-platdrv.c:27:
> >> drivers/i2c/busses/i2c-octeon-core.h:223:21: error: incomplete definition of type 'struct pci_dev'
>            u32 chip_id = (pdev->subsystem_device >> 12) & 0xF;

I guess this needs some fixing?

Other than that, you should really add Robert Richter to CC when
resending. He is at least mentioned for 'Odd fixes' in MAINTAINERS.


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Re: [PATCH 1/3] drivers: i2c: thunderx: octeontx2 clock divisor logic changes

[Wolfram Sang]

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>    In file included from drivers/i2c/busses/i2c-octeon-platdrv.c:27:
> >> drivers/i2c/busses/i2c-octeon-core.h:223:21: error: incomplete definition of type 'struct pci_dev'
>            u32 chip_id = (pdev->subsystem_device >> 12) & 0xF;

I guess this needs some fixing?

Other than that, you should really add Robert Richter to CC when
resending. He is at least mentioned for 'Odd fixes' in MAINTAINERS.


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[PATCH 2/3] drivers: i2c: thunderx: Add support for High speed mode

[Piyush Malgujar]

Support High speed mode clock setup for OcteonTX2 platforms.

Signed-off-by: Suneel Garapati <sgarapati@marvell.com>
Signed-off-by: Piyush Malgujar <pmalgujar@marvell.com>
---
 drivers/i2c/busses/i2c-octeon-core.c     | 64 +++++++++++++++---------
 drivers/i2c/busses/i2c-octeon-core.h     |  3 ++
 drivers/i2c/busses/i2c-thunderx-pcidrv.c |  3 +-
 3 files changed, 46 insertions(+), 24 deletions(-)

diff --git a/drivers/i2c/busses/i2c-octeon-core.c b/drivers/i2c/busses/i2c-octeon-core.c
index 49d07a63a01f0b0711f4fa7a5d13d684935e5cbc..1588d9186b198bfe6ae78626829b3f221d51b8d9 100644
--- a/drivers/i2c/busses/i2c-octeon-core.c
+++ b/drivers/i2c/busses/i2c-octeon-core.c
@@ -608,25 +608,27 @@ int octeon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
 	struct octeon_i2c *i2c = i2c_get_adapdata(adap);
 	int i, ret = 0;
 
-	if (num == 1) {
-		if (msgs[0].len > 0 && msgs[0].len <= 8) {
-			if (msgs[0].flags & I2C_M_RD)
-				ret = octeon_i2c_hlc_read(i2c, msgs);
-			else
-				ret = octeon_i2c_hlc_write(i2c, msgs);
-			goto out;
-		}
-	} else if (num == 2) {
-		if ((msgs[0].flags & I2C_M_RD) == 0 &&
-		    (msgs[1].flags & I2C_M_RECV_LEN) == 0 &&
-		    msgs[0].len > 0 && msgs[0].len <= 2 &&
-		    msgs[1].len > 0 && msgs[1].len <= 8 &&
-		    msgs[0].addr == msgs[1].addr) {
-			if (msgs[1].flags & I2C_M_RD)
-				ret = octeon_i2c_hlc_comp_read(i2c, msgs);
-			else
-				ret = octeon_i2c_hlc_comp_write(i2c, msgs);
-			goto out;
+	if (IS_LS_FREQ(i2c->twsi_freq)) {
+		if (num == 1) {
+			if (msgs[0].len > 0 && msgs[0].len <= 8) {
+				if (msgs[0].flags & I2C_M_RD)
+					ret = octeon_i2c_hlc_read(i2c, msgs);
+				else
+					ret = octeon_i2c_hlc_write(i2c, msgs);
+				goto out;
+			}
+		} else if (num == 2) {
+			if ((msgs[0].flags & I2C_M_RD) == 0 &&
+			    (msgs[1].flags & I2C_M_RECV_LEN) == 0 &&
+			    msgs[0].len > 0 && msgs[0].len <= 2 &&
+			    msgs[1].len > 0 && msgs[1].len <= 8 &&
+			    msgs[0].addr == msgs[1].addr) {
+				if (msgs[1].flags & I2C_M_RD)
+					ret = octeon_i2c_hlc_comp_read(i2c, msgs);
+				else
+					ret = octeon_i2c_hlc_comp_write(i2c, msgs);
+				goto out;
+			}
 		}
 	}
 
@@ -665,10 +667,13 @@ void octeon_i2c_set_clock(struct octeon_i2c *i2c)
 	 * Find divisors to produce target frequency, start with large delta
 	 * to cover wider range of divisors, note thp = TCLK half period.
 	 */
-	int thp = 0x18, mdiv = 2, ndiv = 0, delta_hz = huge_delta;
+	int ds = 10, thp = 0x18, mdiv = 2, ndiv = 0, delta_hz = huge_delta;
 
-	if (octeon_i2c_is_otx2(to_pci_dev(i2c->dev)))
+	if (octeon_i2c_is_otx2(to_pci_dev(i2c->dev))) {
 		thp = 0x3;
+		if (!IS_LS_FREQ(i2c->twsi_freq))
+			ds = 15;
+	}
 
 	for (ndiv_idx = 0; ndiv_idx < 8 && delta_hz != 0; ndiv_idx++) {
 		/*
@@ -680,7 +685,7 @@ void octeon_i2c_set_clock(struct octeon_i2c *i2c)
 			 * For given ndiv and mdiv values check the
 			 * two closest thp values.
 			 */
-			tclk = i2c->twsi_freq * (mdiv_idx + 1) * 10;
+			tclk = i2c->twsi_freq * (mdiv_idx + 1) * ds;
 			tclk *= (1 << ndiv_idx);
 			if (octeon_i2c_is_otx2(to_pci_dev(i2c->dev)))
 				thp_base = (i2c->sys_freq / tclk) - 2;
@@ -698,7 +703,9 @@ void octeon_i2c_set_clock(struct octeon_i2c *i2c)
 					foscl = i2c->sys_freq /
 						(2 * (thp_idx + 1));
 				foscl = foscl / (1 << ndiv_idx);
-				foscl = foscl / (mdiv_idx + 1) / 10;
+				foscl = foscl / (mdiv_idx + 1) / ds;
+				if (foscl > i2c->twsi_freq)
+					continue;
 				diff = abs(foscl - i2c->twsi_freq);
 				/* Use it if smaller diff from target */
 				if (diff < delta_hz) {
@@ -712,6 +719,17 @@ void octeon_i2c_set_clock(struct octeon_i2c *i2c)
 	}
 	octeon_i2c_reg_write(i2c, SW_TWSI_OP_TWSI_CLK, thp);
 	octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_CLKCTL, (mdiv << 3) | ndiv);
+	if (octeon_i2c_is_otx2(to_pci_dev(i2c->dev))) {
+		u64 mode;
+
+		mode = __raw_readq(i2c->twsi_base + MODE(i2c));
+		/* Set REFCLK_SRC and HS_MODE in TWSX_MODE register */
+		if (!IS_LS_FREQ(i2c->twsi_freq))
+			mode |= BIT(4) | BIT(0);
+		else
+			mode &= ~(BIT(4) | BIT(0));
+		octeon_i2c_writeq_flush(mode, i2c->twsi_base + MODE(i2c));
+	}
 }
 
 int octeon_i2c_init_lowlevel(struct octeon_i2c *i2c)
diff --git a/drivers/i2c/busses/i2c-octeon-core.h b/drivers/i2c/busses/i2c-octeon-core.h
index 15d379bf1d3cbba78378edfb6d45415a31ab4072..6a6c7c22c8bace850b9716a96a7d66827268f469 100644
--- a/drivers/i2c/busses/i2c-octeon-core.h
+++ b/drivers/i2c/busses/i2c-octeon-core.h
@@ -92,11 +92,13 @@ struct octeon_i2c_reg_offset {
 	unsigned int sw_twsi;
 	unsigned int twsi_int;
 	unsigned int sw_twsi_ext;
+	unsigned int mode;
 };
 
 #define SW_TWSI(x)	(x->roff.sw_twsi)
 #define TWSI_INT(x)	(x->roff.twsi_int)
 #define SW_TWSI_EXT(x)	(x->roff.sw_twsi_ext)
+#define MODE(x)		(x->roff.mode)
 
 struct octeon_i2c {
 	wait_queue_head_t queue;
@@ -211,6 +213,7 @@ static inline void octeon_i2c_write_int(struct octeon_i2c *i2c, u64 data)
 	octeon_i2c_writeq_flush(data, i2c->twsi_base + TWSI_INT(i2c));
 }
 
+#define IS_LS_FREQ(twsi_freq) ((twsi_freq) <= 400000)
 #define PCI_SUBSYS_DEVID_9XXX 0xB
 /**
  * octeon_i2c_is_otx2 - check for chip ID
diff --git a/drivers/i2c/busses/i2c-thunderx-pcidrv.c b/drivers/i2c/busses/i2c-thunderx-pcidrv.c
index 9fd903196b6cf967cde321da04f8d0526d84cc2f..5621e983406b0bebf9c5c9e30921e45f3f15909b 100644
--- a/drivers/i2c/busses/i2c-thunderx-pcidrv.c
+++ b/drivers/i2c/busses/i2c-thunderx-pcidrv.c
@@ -165,6 +165,7 @@ static int thunder_i2c_probe_pci(struct pci_dev *pdev,
 	i2c->roff.sw_twsi = 0x1000;
 	i2c->roff.twsi_int = 0x1010;
 	i2c->roff.sw_twsi_ext = 0x1018;
+	i2c->roff.mode = 0x1038;
 
 	i2c->dev = dev;
 	pci_set_drvdata(pdev, i2c);
@@ -209,7 +210,7 @@ static int thunder_i2c_probe_pci(struct pci_dev *pdev,
 	 * For OcteonTX2 chips, set reference frequency to 100MHz
 	 * as refclk_src in TWSI_MODE register defaults to 100MHz.
 	 */
-	if (octeon_i2c_is_otx2(pdev))
+	if (octeon_i2c_is_otx2(pdev) && IS_LS_FREQ(i2c->twsi_freq))
 		i2c->sys_freq = 100000000;
 	octeon_i2c_set_clock(i2c);
 
-- 
2.17.1

[PATCH 3/3] drivers: i2c: thunderx: Allow driver to work with ACPI defined TWSI controllers

[Piyush Malgujar]

Due to i2c->adap.dev.fwnode not being set, ACPI_COMPANION() wasn't properly
found for TWSI controllers.

Signed-off-by: Szymon Balcerak <sbalcerak@marvell.com>
Signed-off-by: Piyush Malgujar <pmalgujar@marvell.com>
---
 drivers/i2c/busses/i2c-thunderx-pcidrv.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/i2c/busses/i2c-thunderx-pcidrv.c b/drivers/i2c/busses/i2c-thunderx-pcidrv.c
index 5621e983406b0bebf9c5c9e30921e45f3f15909b..3dd5a4d798f99e9b5282360cf9d5840042fc8dcc 100644
--- a/drivers/i2c/busses/i2c-thunderx-pcidrv.c
+++ b/drivers/i2c/busses/i2c-thunderx-pcidrv.c
@@ -220,6 +220,7 @@ static int thunder_i2c_probe_pci(struct pci_dev *pdev,
 	i2c->adap.bus_recovery_info = &octeon_i2c_recovery_info;
 	i2c->adap.dev.parent = dev;
 	i2c->adap.dev.of_node = pdev->dev.of_node;
+	i2c->adap.dev.fwnode = dev->fwnode;
 	snprintf(i2c->adap.name, sizeof(i2c->adap.name),
 		 "Cavium ThunderX i2c adapter at %s", dev_name(dev));
 	i2c_set_adapdata(&i2c->adap, i2c);
-- 
2.17.1

Re: [PATCH 3/3] drivers: i2c: thunderx: Allow driver to work with ACPI defined TWSI controllers

[Wolfram Sang]

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On Wed, May 11, 2022 at 06:36:59AM -0700, Piyush Malgujar wrote:
> Due to i2c->adap.dev.fwnode not being set, ACPI_COMPANION() wasn't properly
> found for TWSI controllers.
> 
> Signed-off-by: Szymon Balcerak <sbalcerak@marvell.com>
> Signed-off-by: Piyush Malgujar <pmalgujar@marvell.com>

Applied to for-current, thanks!


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