From patchwork Thu Apr 11 15:55:26 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dinh Nguyen X-Patchwork-Id: 2429491 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) by patchwork2.kernel.org (Postfix) with ESMTP id D6405DF230 for ; Thu, 11 Apr 2013 15:55:30 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UQJq7-0004TN-9z; Thu, 11 Apr 2013 15:55:07 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UQJpt-00053X-U1; Thu, 11 Apr 2013 15:54:53 +0000 Received: from ch1ehsobe003.messaging.microsoft.com ([216.32.181.183] helo=ch1outboundpool.messaging.microsoft.com) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UQJpT-00050B-V9 for linux-arm-kernel@lists.infradead.org; Thu, 11 Apr 2013 15:54:30 +0000 Received: from mail72-ch1-R.bigfish.com (10.43.68.237) by CH1EHSOBE003.bigfish.com (10.43.70.53) with Microsoft SMTP Server id 14.1.225.23; Thu, 11 Apr 2013 15:54:25 +0000 Received: from mail72-ch1 (localhost [127.0.0.1]) by mail72-ch1-R.bigfish.com (Postfix) with ESMTP id D6E21600E7; Thu, 11 Apr 2013 15:54:25 +0000 (UTC) X-Forefront-Antispam-Report: CIP:66.35.236.232; KIP:(null); UIP:(null); IPV:NLI; H:SJ-ITEXEDGE02.altera.priv.altera.com; RD:none; EFVD:NLI X-SpamScore: 3 X-BigFish: VS3(zzc8kzz1f42h1fc6h1ee6h1de0h1fdah1202h1e76h1d1ah1d2ahzz17326ah8275bh8275dh84d07hz2fh2a8h668h839hd24he5bhf0ah1288h12a5h12a9h12bdh12e5h137ah139eh13b6h1441h14ddh1504h1537h162dh1631h1758h1898h18e1h1946h19b5h1ad9h1b0ah1155h) Received-SPF: pass (mail72-ch1: domain of altera.com designates 66.35.236.232 as permitted sender) client-ip=66.35.236.232; envelope-from=dinguyen@altera.com; helo=SJ-ITEXEDGE02.altera.priv.altera.com ; v.altera.com ; Received: from mail72-ch1 (localhost.localdomain [127.0.0.1]) by mail72-ch1 (MessageSwitch) id 1365695663317530_30798; Thu, 11 Apr 2013 15:54:23 +0000 (UTC) Received: from CH1EHSMHS043.bigfish.com (snatpool2.int.messaging.microsoft.com [10.43.68.234]) by mail72-ch1.bigfish.com (Postfix) with ESMTP id 3F6262E004B; Thu, 11 Apr 2013 15:54:23 +0000 (UTC) Received: from SJ-ITEXEDGE02.altera.priv.altera.com (66.35.236.232) by CH1EHSMHS043.bigfish.com (10.43.69.252) with Microsoft SMTP Server (TLS) id 14.1.225.23; Thu, 11 Apr 2013 15:54:22 +0000 Received: from sj-mail01.altera.com (137.57.1.6) by SJ-ITEXEDGE02.altera.priv.altera.com (66.35.236.232) with Microsoft SMTP Server id 8.3.298.1; Thu, 11 Apr 2013 08:44:53 -0700 Received: from linux-builds1.altera.com (linux-builds1.altera.com [137.57.188.121]) by sj-mail01.altera.com (8.13.7+Sun/8.13.7) with ESMTP id r3BFsF1r026295; Thu, 11 Apr 2013 08:54:20 -0700 (PDT) From: To: Subject: [PATCHv3 3/3] ARM: socfpga: Upgrade clk driver for socfpga to make use of dts clock entries Date: Thu, 11 Apr 2013 10:55:26 -0500 Message-ID: <1365695726-26849-3-git-send-email-dinguyen@altera.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1365695726-26849-1-git-send-email-dinguyen@altera.com> References: <1365695726-26849-1-git-send-email-dinguyen@altera.com> MIME-Version: 1.0 X-OriginatorOrg: altera.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130411_115428_096317_84A1F2C4 X-CRM114-Status: GOOD ( 20.31 ) X-Spam-Score: -2.6 (--) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-2.6 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [216.32.181.183 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: dinh.linux@gmail.com, arnd@arndb.de, pavel@denx.de, Dinh Nguyen , olof@lixom.net, mturquette@linaro.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Dinh Nguyen With this patch, the socfpga clk driver is able to query the clock and clock rates appropriately. Signed-off-by: Dinh Nguyen Reviewed-by: Pavel Machek --- arch/arm/mach-socfpga/socfpga.c | 6 ++ drivers/clk/socfpga/clk.c | 163 ++++++++++++++++++++++++++++++++++----- 2 files changed, 148 insertions(+), 21 deletions(-) diff --git a/arch/arm/mach-socfpga/socfpga.c b/arch/arm/mach-socfpga/socfpga.c index 2cae16c..46a0513 100644 --- a/arch/arm/mach-socfpga/socfpga.c +++ b/arch/arm/mach-socfpga/socfpga.c @@ -15,6 +15,7 @@ * along with this program. If not, see . */ #include +#include #include #include #include @@ -29,6 +30,7 @@ void __iomem *socfpga_scu_base_addr = ((void __iomem *)(SOCFPGA_SCU_VIRT_BASE)); void __iomem *sys_manager_base_addr; void __iomem *rst_manager_base_addr; +void __iomem *clk_mgr_base_addr; unsigned long cpu1start_addr; static struct map_desc scu_io_desc __initdata = { @@ -77,6 +79,9 @@ void __init socfpga_sysmgr_init(void) np = of_find_compatible_node(NULL, NULL, "altr,rst-mgr"); rst_manager_base_addr = of_iomap(np, 0); + + np = of_find_compatible_node(NULL, NULL, "altr,clk-mgr"); + clk_mgr_base_addr = of_iomap(np, 0); } static void __init socfpga_init_irq(void) @@ -102,6 +107,7 @@ static void __init socfpga_cyclone5_init(void) { l2x0_of_init(0, ~0UL); of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); + of_clk_init(NULL); socfpga_init_clocks(); } diff --git a/drivers/clk/socfpga/clk.c b/drivers/clk/socfpga/clk.c index 2c855a6..bd11315 100644 --- a/drivers/clk/socfpga/clk.c +++ b/drivers/clk/socfpga/clk.c @@ -1,5 +1,6 @@ /* - * Copyright (C) 2012 Altera Corporation + * Copyright 2011-2012 Calxeda, Inc. + * Copyright (C) 2012-2013 Altera Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -11,41 +12,161 @@ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * + * Based from clk-highbank.c + * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include +#include +#include -#define SOCFPGA_OSC1_CLK 10000000 -#define SOCFPGA_MPU_CLK 800000000 -#define SOCFPGA_MAIN_QSPI_CLK 432000000 -#define SOCFPGA_MAIN_NAND_SDMMC_CLK 250000000 -#define SOCFPGA_S2F_USR_CLK 125000000 +/* Clock Manager offsets */ +#define CLKMGR_CTRL 0x0 +#define CLKMGR_BYPASS 0x4 -void __init socfpga_init_clocks(void) +/* Clock bypass bits */ +#define MAINPLL_BYPASS (1<<0) +#define SDRAMPLL_BYPASS (1<<1) +#define SDRAMPLL_SRC_BYPASS (1<<2) +#define PERPLL_BYPASS (1<<3) +#define PERPLL_SRC_BYPASS (1<<4) + +#define SOCFPGA_PLL_BG_PWRDWN 0 +#define SOCFPGA_PLL_EXT_ENA 1 +#define SOCFPGA_PLL_PWR_DOWN 2 +#define SOCFPGA_PLL_DIVF_MASK 0x0000FFF8 +#define SOCFPGA_PLL_DIVF_SHIFT 3 +#define SOCFPGA_PLL_DIVQ_MASK 0x003F0000 +#define SOCFPGA_PLL_DIVQ_SHIFT 16 + +extern void __iomem *clk_mgr_base_addr; + +struct socfpga_clk { + struct clk_gate hw; + char *parent_name; + char *clk_name; + u32 fixed_div; +}; +#define to_socfpga_clk(p) container_of(p, struct socfpga_clk, hw.hw) + +static unsigned long clk_pll_recalc_rate(struct clk_hw *hwclk, + unsigned long parent_rate) { + struct socfpga_clk *socfpgaclk = to_socfpga_clk(hwclk); + unsigned long divf, divq, vco_freq, reg; + unsigned long bypass; + + reg = readl(socfpgaclk->hw.reg); + bypass = readl(clk_mgr_base_addr + CLKMGR_BYPASS); + if (bypass & MAINPLL_BYPASS) + return parent_rate; + + divf = (reg & SOCFPGA_PLL_DIVF_MASK) >> SOCFPGA_PLL_DIVF_SHIFT; + divq = (reg & SOCFPGA_PLL_DIVQ_MASK) >> SOCFPGA_PLL_DIVQ_SHIFT; + vco_freq = parent_rate * (divf + 1); + return vco_freq / (1 + divq); +} + + +static struct clk_ops clk_pll_ops = { + .recalc_rate = clk_pll_recalc_rate, +}; + +static unsigned long clk_periclk_recalc_rate(struct clk_hw *hwclk, + unsigned long parent_rate) +{ + struct socfpga_clk *socfpgaclk = to_socfpga_clk(hwclk); + u32 div; + + if (socfpgaclk->fixed_div) + div = socfpgaclk->fixed_div; + else + div = ((readl(socfpgaclk->hw.reg) & 0x1ff) + 1); + + return parent_rate / div; +} + +static const struct clk_ops periclk_ops = { + .recalc_rate = clk_periclk_recalc_rate, +}; + +static __init struct clk *socfpga_clk_init(struct device_node *node, + const struct clk_ops *ops) +{ + u32 reg; struct clk *clk; + struct socfpga_clk *socfpga_clk; + const char *clk_name = node->name; + const char *parent_name; + struct clk_init_data init; + int rc; + u32 fixed_div; + + rc = of_property_read_u32(node, "reg", ®); + if (WARN_ON(rc)) + return NULL; + + socfpga_clk = kzalloc(sizeof(*socfpga_clk), GFP_KERNEL); + if (WARN_ON(!socfpga_clk)) + return NULL; + + socfpga_clk->hw.reg = clk_mgr_base_addr + reg; + + rc = of_property_read_u32(node, "fixed-divider", &fixed_div); + if (rc) + socfpga_clk->fixed_div = 0; + else + socfpga_clk->fixed_div = fixed_div; + + of_property_read_string(node, "clock-output-names", &clk_name); + + init.name = clk_name; + init.ops = ops; + init.flags = 0; + parent_name = of_clk_get_parent_name(node, 0); + init.parent_names = &parent_name; + init.num_parents = 1; - clk = clk_register_fixed_rate(NULL, "osc1_clk", NULL, CLK_IS_ROOT, SOCFPGA_OSC1_CLK); - clk_register_clkdev(clk, "osc1_clk", NULL); + socfpga_clk->hw.hw.init = &init; - clk = clk_register_fixed_rate(NULL, "mpu_clk", NULL, CLK_IS_ROOT, SOCFPGA_MPU_CLK); - clk_register_clkdev(clk, "mpu_clk", NULL); + if (strcmp(clk_name, "main_pll") || strcmp(clk_name, "periph_pll") || + strcmp(clk_name, "sdram_pll")) { + socfpga_clk->hw.bit_idx = SOCFPGA_PLL_EXT_ENA; + clk_pll_ops.enable = clk_gate_ops.enable; + clk_pll_ops.disable = clk_gate_ops.disable; + } - clk = clk_register_fixed_rate(NULL, "main_clk", NULL, CLK_IS_ROOT, SOCFPGA_MPU_CLK/2); - clk_register_clkdev(clk, "main_clk", NULL); + clk = clk_register(NULL, &socfpga_clk->hw.hw); + if (WARN_ON(IS_ERR(clk))) { + kfree(socfpga_clk); + return NULL; + } + rc = of_clk_add_provider(node, of_clk_src_simple_get, clk); + return clk; +} - clk = clk_register_fixed_rate(NULL, "dbg_base_clk", NULL, CLK_IS_ROOT, SOCFPGA_MPU_CLK/2); - clk_register_clkdev(clk, "dbg_base_clk", NULL); +static void __init socfpga_pll_init(struct device_node *node) +{ + socfpga_clk_init(node, &clk_pll_ops); +} +CLK_OF_DECLARE(socfpga_pll, "altr,socfpga-pll-clock", socfpga_pll_init); - clk = clk_register_fixed_rate(NULL, "main_qspi_clk", NULL, CLK_IS_ROOT, SOCFPGA_MAIN_QSPI_CLK); - clk_register_clkdev(clk, "main_qspi_clk", NULL); +static void __init socfpga_periph_init(struct device_node *node) +{ + socfpga_clk_init(node, &periclk_ops); +} +CLK_OF_DECLARE(socfpga_periph, "altr,socfpga-perip-clk", socfpga_periph_init); - clk = clk_register_fixed_rate(NULL, "main_nand_sdmmc_clk", NULL, CLK_IS_ROOT, SOCFPGA_MAIN_NAND_SDMMC_CLK); - clk_register_clkdev(clk, "main_nand_sdmmc_clk", NULL); +void __init socfpga_init_clocks(void) +{ + struct clk *clk; + int ret; - clk = clk_register_fixed_rate(NULL, "s2f_usr_clk", NULL, CLK_IS_ROOT, SOCFPGA_S2F_USR_CLK); - clk_register_clkdev(clk, "s2f_usr_clk", NULL); + clk = clk_register_fixed_factor(NULL, "smp_twd", "mpuclk", 0, 1, 4); + ret = clk_register_clkdev(clk, NULL, "smp_twd"); + if (ret) + pr_err("smp_twd alias not registered\n"); }