From patchwork Wed Jun 22 11:46:14 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Avinash H.M." X-Patchwork-Id: 904582 X-Patchwork-Delegate: paul@pwsan.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.4) with ESMTP id p5MBkad2006181 for ; Wed, 22 Jun 2011 11:47:23 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755071Ab1FVLqf (ORCPT ); Wed, 22 Jun 2011 07:46:35 -0400 Received: from bear.ext.ti.com ([192.94.94.41]:58598 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753450Ab1FVLqd (ORCPT ); Wed, 22 Jun 2011 07:46:33 -0400 Received: from dbdp20.itg.ti.com ([172.24.170.38]) by bear.ext.ti.com (8.13.7/8.13.7) with ESMTP id p5MBkPau004864 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 22 Jun 2011 06:46:28 -0500 Received: from dbde71.ent.ti.com (localhost [127.0.0.1]) by dbdp20.itg.ti.com (8.13.8/8.13.8) with ESMTP id p5MBkPYg016930; Wed, 22 Jun 2011 17:16:25 +0530 (IST) Received: from dbdp31.itg.ti.com (172.24.170.98) by DBDE71.ent.ti.com (172.24.170.149) with Microsoft SMTP Server id 8.3.106.1; Wed, 22 Jun 2011 17:16:25 +0530 Received: from avinash-laptop.apr.dhcp.ti.com (avinash-laptop.apr.dhcp.ti.com [172.24.137.100]) by dbdp31.itg.ti.com (8.13.8/8.13.8) with ESMTP id p5MBkGR8001208; Wed, 22 Jun 2011 17:16:22 +0530 (IST) From: "Avinash.H.M" To: , CC: "Avinash.H.M" , Rajendra Nayak , Paul Walmsley , Benoit Cousson , Kevin Hilman Subject: [PATCH v5 2/2] OMAP: hwmod: fix the i2c-reset timeout during bootup Date: Wed, 22 Jun 2011 17:16:14 +0530 Message-ID: <1308743174-12265-2-git-send-email-avinashhm@ti.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1308743174-12265-1-git-send-email-avinashhm@ti.com> References: <1308743174-12265-1-git-send-email-avinashhm@ti.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Wed, 22 Jun 2011 11:47:25 +0000 (UTC) The sequence of _ocp_softreset doesn't work for i2c. The i2c module has a special sequence to reset the module. The sequence is - Disable the I2C. - Write to SOFTRESET bit. - Enable the I2C. - Poll on the RESETDONE bit. The sequence is implemented as a function and the i2c_class is updated with the correct 'reset' pointer. omap_hwmod_softreset function is implemented which triggers the softreset by writing into sysconfig register. On following this sequence, i2c module resets properly and timeouts are not seen. Cc: Rajendra Nayak Cc: Paul Walmsley Cc: Benoit Cousson Cc: Kevin Hilman Signed-off-by: Avinash.H.M --- The patch is based on * git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git * master branch. * 5629937 commit (Linux 3.0-rc4). Changes from previous versions: from v4: - Fixed Tomi's comment. Removed including hwmod.h in i2c.h - The sequence is applicable even for omap4. So removed the INIT_NO_RESET flags from i2c hwmods and extend the patch to omap4 also. ( .reset pointer is populated accordingly ). - http://www.spinics.net/lists/linux-omap/msg51377.html from v3: - Addressed comments from Paul Walmsley. - http://www.spinics.net/lists/arm-kernel/msg124120.html from v2: - Avoided direct SYSCONFIG access in i2c.c - http://www.spinics.net/lists/linux-omap/msg49632.html from v1: - moved i2c specific things from hwmod files to i2c files. - fixed comments from Paul. - http://www.spinics.net/lists/linux-omap/msg49483.html Testing: * build tested omap2plus_defconfig for warnings and errors. none introduced. * boot tested on 2430, 4430. No timeouts are seen with this patch. * tested for 'core off' in suspend resume on 3430 sdp. core off counters increment after suspend resume. Dependency: * This needs "OMAP2+: hwmod data: Set hwmod flags to only allow 16-bit accesses to i2c" from Andry Green for accessing i2c_sysc. Without this even with this patch, we will see i2c reset timeouts. arch/arm/mach-omap2/i2c.c | 63 ++++++++++++++++++++++++++ arch/arm/mach-omap2/omap_hwmod.c | 27 +++++++++++ arch/arm/mach-omap2/omap_hwmod_2420_data.c | 1 + arch/arm/mach-omap2/omap_hwmod_2430_data.c | 1 + arch/arm/mach-omap2/omap_hwmod_3xxx_data.c | 1 + arch/arm/mach-omap2/omap_hwmod_44xx_data.c | 2 + arch/arm/plat-omap/include/plat/i2c.h | 3 + arch/arm/plat-omap/include/plat/omap_hwmod.h | 1 + 8 files changed, 99 insertions(+), 0 deletions(-) diff --git a/arch/arm/mach-omap2/i2c.c b/arch/arm/mach-omap2/i2c.c index 79c478c..5c2445e 100644 --- a/arch/arm/mach-omap2/i2c.c +++ b/arch/arm/mach-omap2/i2c.c @@ -21,9 +21,19 @@ #include #include +#include +#include #include "mux.h" +/* In register I2C_CON, Bit 15 is the I2C enable bit */ +#define I2C_EN BIT(15) +#define OMAP2_I2C_CON_OFFSET 0x24 +#define OMAP4_I2C_CON_OFFSET 0xA4 + +/* Maximum microseconds to wait for OMAP module to softreset */ +#define MAX_MODULE_SOFTRESET_WAIT 10000 + void __init omap2_i2c_mux_pins(int bus_id) { char mux_name[sizeof("i2c2_scl.i2c2_scl")]; @@ -37,3 +47,56 @@ void __init omap2_i2c_mux_pins(int bus_id) sprintf(mux_name, "i2c%i_sda.i2c%i_sda", bus_id, bus_id); omap_mux_init_signal(mux_name, OMAP_PIN_INPUT); } + +/** + * omap_i2c_reset - reset the omap i2c module. + * @oh: struct omap_hwmod * + * + * The i2c moudle in omap2, omap3 had a special sequence to reset. The + * sequence is: + * - Disable the I2C. + * - Write to SOFTRESET bit. + * - Enable the I2C. + * - Poll on the RESETDONE bit. + * The sequence is implemented in below function. This is called for 2420, + * 2430 and omap3. + */ +int omap_i2c_reset(struct omap_hwmod *oh) +{ + u32 v; + u16 i2c_con; + int c = 0; + + if (cpu_is_omap44xx()) + i2c_con = OMAP4_I2C_CON_OFFSET; + else + i2c_con = OMAP2_I2C_CON_OFFSET; + + /* Disable I2C */ + v = omap_hwmod_read(oh, i2c_con); + v = v & ~I2C_EN; + omap_hwmod_write(v, oh, i2c_con); + + /* Write to the SOFTRESET bit */ + omap_hwmod_softreset(oh); + + /* Enable I2C */ + v = omap_hwmod_read(oh, i2c_con); + v |= I2C_EN; + omap_hwmod_write(v, oh, i2c_con); + + /* Poll on RESETDONE bit */ + omap_test_timeout((omap_hwmod_read(oh, + oh->class->sysc->syss_offs) + & SYSS_RESETDONE_MASK), + MAX_MODULE_SOFTRESET_WAIT, c); + + if (c == MAX_MODULE_SOFTRESET_WAIT) + pr_warning("%s: %s: softreset failed (waited %d usec)\n", + __func__, oh->name, MAX_MODULE_SOFTRESET_WAIT); + else + pr_debug("%s: %s: softreset in %d usec\n", __func__, + oh->name, c); + + return 0; +} diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c index 293fa6c..64ffec4 100644 --- a/arch/arm/mach-omap2/omap_hwmod.c +++ b/arch/arm/mach-omap2/omap_hwmod.c @@ -1562,6 +1562,33 @@ void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs) } /** + * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit + * @oh: struct omap_hwmod * + * + * This is a public function exposed to drivers. Some drivers may need to do + * some settings before and after resetting the device. Those drivers after + * doing the necessary settings could use this function to start a reset by + * setting the SYSCONFIG.SOFTRESET bit. + */ +int omap_hwmod_softreset(struct omap_hwmod *oh) +{ + u32 v; + int ret; + + if (!oh || !(oh->_sysc_cache)) + return -EINVAL; + + v = oh->_sysc_cache; + ret = _set_softreset(oh, &v); + if (ret) + goto error; + _write_sysconfig(v, oh); + +error: + return ret; +} + +/** * omap_hwmod_set_slave_idlemode - set the hwmod's OCP slave idlemode * @oh: struct omap_hwmod * * @idlemode: SIDLEMODE field bits (shifted to bit 0) diff --git a/arch/arm/mach-omap2/omap_hwmod_2420_data.c b/arch/arm/mach-omap2/omap_hwmod_2420_data.c index c4d0ae8..8950ad3 100644 --- a/arch/arm/mach-omap2/omap_hwmod_2420_data.c +++ b/arch/arm/mach-omap2/omap_hwmod_2420_data.c @@ -1447,6 +1447,7 @@ static struct omap_hwmod_class_sysconfig i2c_sysc = { static struct omap_hwmod_class i2c_class = { .name = "i2c", .sysc = &i2c_sysc, + .reset = &omap_i2c_reset, }; static struct omap_i2c_dev_attr i2c_dev_attr; diff --git a/arch/arm/mach-omap2/omap_hwmod_2430_data.c b/arch/arm/mach-omap2/omap_hwmod_2430_data.c index 9682dd5..6b5413b 100644 --- a/arch/arm/mach-omap2/omap_hwmod_2430_data.c +++ b/arch/arm/mach-omap2/omap_hwmod_2430_data.c @@ -1524,6 +1524,7 @@ static struct omap_hwmod_class_sysconfig i2c_sysc = { static struct omap_hwmod_class i2c_class = { .name = "i2c", .sysc = &i2c_sysc, + .reset = &omap_i2c_reset, }; static struct omap_i2c_dev_attr i2c_dev_attr = { diff --git a/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c b/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c index 909a84d..2e21e2d 100644 --- a/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c +++ b/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c @@ -1460,6 +1460,7 @@ static struct omap_hwmod omap3xxx_uart4_hwmod = { static struct omap_hwmod_class i2c_class = { .name = "i2c", .sysc = &i2c_sysc, + .reset = &omap_i2c_reset, }; /* diff --git a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c index 2eaf40a..5e11c0b 100644 --- a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c +++ b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c @@ -22,6 +22,7 @@ #include #include +#include #include #include #include @@ -2125,6 +2126,7 @@ static struct omap_hwmod_class_sysconfig omap44xx_i2c_sysc = { static struct omap_hwmod_class omap44xx_i2c_hwmod_class = { .name = "i2c", .sysc = &omap44xx_i2c_sysc, + .reset = &omap_i2c_reset, }; /* i2c1 */ diff --git a/arch/arm/plat-omap/include/plat/i2c.h b/arch/arm/plat-omap/include/plat/i2c.h index 878d632..ad53959 100644 --- a/arch/arm/plat-omap/include/plat/i2c.h +++ b/arch/arm/plat-omap/include/plat/i2c.h @@ -52,4 +52,7 @@ struct omap_i2c_dev_attr { void __init omap1_i2c_mux_pins(int bus_id); void __init omap2_i2c_mux_pins(int bus_id); +struct omap_hwmod; +int omap_i2c_reset(struct omap_hwmod *oh); + #endif /* __ASM__ARCH_OMAP_I2C_H */ diff --git a/arch/arm/plat-omap/include/plat/omap_hwmod.h b/arch/arm/plat-omap/include/plat/omap_hwmod.h index 1adea9c..fe8a0a2 100644 --- a/arch/arm/plat-omap/include/plat/omap_hwmod.h +++ b/arch/arm/plat-omap/include/plat/omap_hwmod.h @@ -572,6 +572,7 @@ void omap_hwmod_ocp_barrier(struct omap_hwmod *oh); void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs); u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs); +int omap_hwmod_softreset(struct omap_hwmod *oh); int omap_hwmod_count_resources(struct omap_hwmod *oh); int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res);