From patchwork Mon Mar 15 16:26:12 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mika Westerberg X-Patchwork-Id: 85997 Received: from lists.sourceforge.net (lists.sourceforge.net [216.34.181.88]) by demeter.kernel.org (8.14.3/8.14.3) with ESMTP id o2FGQXwl015271 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 15 Mar 2010 16:27:09 GMT Received: from localhost ([127.0.0.1] helo=sfs-ml-3.v29.ch3.sourceforge.com) by sfs-ml-3.v29.ch3.sourceforge.com with esmtp (Exim 4.69) (envelope-from ) id 1NrD7h-0005Ye-GH; Mon, 15 Mar 2010 16:26:33 +0000 Received: from sfi-mx-2.v28.ch3.sourceforge.com ([172.29.28.122] helo=mx.sourceforge.net) by sfs-ml-3.v29.ch3.sourceforge.com with esmtp (Exim 4.69) (envelope-from ) id 1NrD7f-0005YR-TP for spi-devel-general@lists.sourceforge.net; Mon, 15 Mar 2010 16:26:31 +0000 Received-SPF: pass (sfi-mx-2.v28.ch3.sourceforge.com: domain of gmail.com designates 72.14.220.154 as permitted sender) client-ip=72.14.220.154; envelope-from=mika.westerberg@gmail.com; helo=fg-out-1718.google.com; Received: from fg-out-1718.google.com ([72.14.220.154]) by sfi-mx-2.v28.ch3.sourceforge.com with esmtp (Exim 4.69) id 1NrD7d-00075N-6U for spi-devel-general@lists.sourceforge.net; Mon, 15 Mar 2010 16:26:31 +0000 Received: by fg-out-1718.google.com with SMTP id e21so1093989fga.10 for ; Mon, 15 Mar 2010 09:26:22 -0700 (PDT) Received: by 10.87.46.12 with SMTP id y12mr6751595fgj.47.1268670382516; Mon, 15 Mar 2010 09:26:22 -0700 (PDT) Received: from localhost.localdomain (a88-115-42-115.elisa-laajakaista.fi [88.115.42.115]) by mx.google.com with ESMTPS id z10sm7344413fka.31.2010.03.15.09.26.21 (version=SSLv3 cipher=RC4-MD5); Mon, 15 Mar 2010 09:26:22 -0700 (PDT) From: Mika Westerberg To: spi-devel-general@lists.sourceforge.net Date: Mon, 15 Mar 2010 18:26:12 +0200 Message-Id: <7346460bf58ddd90037e92e70f44e60df64540fe.1268669236.git.mika.westerberg@iki.fi> X-Mailer: git-send-email 1.5.6.5 In-Reply-To: <3d93e748eb068963a9378b454ba9cd117cbbc737.1268669236.git.mika.westerberg@iki.fi> References: <774b9c08b6e9484a2ca5084b8b6019aa18dddd99.1268669236.git.mika.westerberg@iki.fi> <3d93e748eb068963a9378b454ba9cd117cbbc737.1268669236.git.mika.westerberg@iki.fi> In-Reply-To: References: X-Spam-Score: -1.5 (-) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -1.5 SPF_CHECK_PASS SPF reports sender host as permitted sender for sender-domain -0.0 SPF_PASS SPF: sender matches SPF record -0.0 DKIM_VERIFIED Domain Keys Identified Mail: signature passes verification 0.0 DKIM_SIGNED Domain Keys Identified Mail: message has a signature -0.0 AWL AWL: From: address is in the auto white-list X-Headers-End: 1NrD7d-00075N-6U Cc: linux-arm-kernel@lists.infradead.org Subject: [spi-devel-general] [PATCH 3/3] ep93xx: SPI driver platform support code X-BeenThere: spi-devel-general@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: Linux SPI core/device drivers discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: spi-devel-general-bounces@lists.sourceforge.net X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Mon, 15 Mar 2010 16:27:09 +0000 (UTC) diff --git a/arch/arm/mach-ep93xx/clock.c b/arch/arm/mach-ep93xx/clock.c index 5f80092..1dc22cc 100644 --- a/arch/arm/mach-ep93xx/clock.c +++ b/arch/arm/mach-ep93xx/clock.c @@ -100,6 +100,10 @@ static struct clk clk_pwm = { .parent = &clk_xtali, .rate = EP93XX_EXT_CLK_RATE, }; +static struct clk clk_spi = { + .parent = &clk_xtali, + .rate = EP93XX_EXT_CLK_RATE / 2, +}; static struct clk clk_video = { .sw_locked = 1, @@ -187,6 +191,7 @@ static struct clk_lookup clocks[] = { INIT_CK("ep93xx-keypad", NULL, &clk_keypad), INIT_CK("ep93xx-fb", NULL, &clk_video), INIT_CK(NULL, "pwm_clk", &clk_pwm), + INIT_CK(NULL, "spi_clk", &clk_spi), INIT_CK(NULL, "m2p0", &clk_m2p0), INIT_CK(NULL, "m2p1", &clk_m2p1), INIT_CK(NULL, "m2p2", &clk_m2p2), @@ -480,6 +485,22 @@ static int __init ep93xx_clock_init(void) clk_p.rate / 1000000); clkdev_add_table(clocks, ARRAY_SIZE(clocks)); + + /* + * EP93xx SSP clock rate was doubled in version E2 and forwards. For + * more information see: + * http://www.cirrus.com/en/pubs/appNote/AN273REV4.pdf + */ + if (ep93xx_chip_revision() >= EP93XX_CHIP_REV_E2) { + struct clk *clk; + + clk = clk_get(NULL, "spi_clk"); + if (!IS_ERR(clk)) { + clk->rate *= 2; + clk_put(clk); + } + } + return 0; } arch_initcall(ep93xx_clock_init); diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c index 2e496c9..36a7833 100644 --- a/arch/arm/mach-ep93xx/core.c +++ b/arch/arm/mach-ep93xx/core.c @@ -31,6 +31,7 @@ #include #include #include +#include #include #include @@ -389,6 +390,47 @@ void __init ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr) platform_device_register(&ep93xx_eth_device); } +static struct resource ep93xx_spi_resources[] = { + { + .start = EP93XX_SPI_PHYS_BASE, + .end = EP93XX_SPI_PHYS_BASE + SZ_4K - 1, + .flags = IORESOURCE_MEM, + }, + { + .start = IRQ_EP93XX_SSP, + .flags = IORESOURCE_IRQ, + }, +}; + +static struct platform_device ep93xx_spi_device = { + .name = "ep93xx-spi", + .id = -1, + .num_resources = ARRAY_SIZE(ep93xx_spi_resources), + .resource = ep93xx_spi_resources, +}; + +/** + * ep93xx_register_spi() - registers spi platform device + * @info: ep93xx board specific spi info + * + * This function registers platform device for the EP93xx SPI controller and + * also makes sure that SPI pins are muxed so that I2S is not using those + * pins. Caller should allocate necessary GPIO lines and register any SPI + * devices before calling this (see also spi_register_board_info()). + * + * Returns %0 in success and negative value in case of failure. + */ +int __init ep93xx_register_spi(struct ep93xx_spi_info *info) +{ + /* + * When SPI is used, we need to make sure that I2S is muxed off from + * SPI pins. + */ + ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2SONSSP); + + ep93xx_spi_device.dev.platform_data = info; + return platform_device_register(&ep93xx_spi_device); +} /************************************************************************* * EP93xx i2c peripheral handling diff --git a/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h b/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h index 93e2ecc..b1e096f 100644 --- a/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h +++ b/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h @@ -106,6 +106,7 @@ #define EP93XX_AAC_BASE EP93XX_APB_IOMEM(0x00080000) +#define EP93XX_SPI_PHYS_BASE EP93XX_APB_PHYS(0x000a0000) #define EP93XX_SPI_BASE EP93XX_APB_IOMEM(0x000a0000) #define EP93XX_IRDA_BASE EP93XX_APB_IOMEM(0x000b0000) diff --git a/arch/arm/mach-ep93xx/include/mach/platform.h b/arch/arm/mach-ep93xx/include/mach/platform.h index 8603837..1f02147 100644 --- a/arch/arm/mach-ep93xx/include/mach/platform.h +++ b/arch/arm/mach-ep93xx/include/mach/platform.h @@ -9,6 +9,7 @@ struct i2c_board_info; struct platform_device; struct ep93xxfb_mach_info; struct ep93xx_keypad_platform_data; +struct ep93xx_spi_info; struct ep93xx_eth_data { @@ -49,6 +50,7 @@ void ep93xx_register_i2c(struct i2c_gpio_platform_data *data, struct i2c_board_info *devices, int num); void ep93xx_register_fb(struct ep93xxfb_mach_info *data); void ep93xx_register_pwm(int pwm0, int pwm1); +int ep93xx_register_spi(struct ep93xx_spi_info *info); int ep93xx_pwm_acquire_gpio(struct platform_device *pdev); void ep93xx_pwm_release_gpio(struct platform_device *pdev); void ep93xx_register_keypad(struct ep93xx_keypad_platform_data *data);