From patchwork Thu May 23 21:36:39 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dinh Nguyen X-Patchwork-Id: 2609081 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 47238DFB78 for ; Thu, 23 May 2013 21:36:48 +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 1UfdBD-000421-TI; Thu, 23 May 2013 21:36:12 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UfdAv-00009E-9B; Thu, 23 May 2013 21:35:53 +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 1UfdAr-00007e-R4 for linux-arm-kernel@lists.infradead.org; Thu, 23 May 2013 21:35:50 +0000 Received: from mail112-ch1-R.bigfish.com (10.43.68.245) by CH1EHSOBE010.bigfish.com (10.43.70.60) with Microsoft SMTP Server id 14.1.225.23; Thu, 23 May 2013 21:35:22 +0000 Received: from mail112-ch1 (localhost [127.0.0.1]) by mail112-ch1-R.bigfish.com (Postfix) with ESMTP id DDFF460627; Thu, 23 May 2013 21:35:22 +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: 0 X-BigFish: VS0(zzzz1f42h1ee6h1de0h1fdah1202h1e76h1d1ah1d2ah1fc6hzz8275ch8275bh8275dh84d07hz2fh2a8h668h839hd24he5bhf0ah1288h12a5h12a9h12bdh12e5h137ah139eh13b6h1441h14ddh1504h1537h162dh1631h1758h1898h18e1h1946h19b5h1ad9h1b0ah1d0ch1d2eh1d3fh1155h) Received-SPF: pass (mail112-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 mail112-ch1 (localhost.localdomain [127.0.0.1]) by mail112-ch1 (MessageSwitch) id 1369344890747555_1363; Thu, 23 May 2013 21:34:50 +0000 (UTC) Received: from CH1EHSMHS032.bigfish.com (snatpool3.int.messaging.microsoft.com [10.43.68.226]) by mail112-ch1.bigfish.com (Postfix) with ESMTP id B3593100209; Thu, 23 May 2013 21:34:50 +0000 (UTC) Received: from SJ-ITEXEDGE02.altera.priv.altera.com (66.35.236.232) by CH1EHSMHS032.bigfish.com (10.43.70.32) with Microsoft SMTP Server (TLS) id 14.1.225.23; Thu, 23 May 2013 21:34:48 +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, 23 May 2013 14:24:53 -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 r4NLYeRd019839; Thu, 23 May 2013 14:34:47 -0700 (PDT) From: To: Subject: [PATCHv3 3/6] ARM: socfpga: Add support to gate peripheral clocks Date: Thu, 23 May 2013 16:36:39 -0500 Message-ID: <1369345002-20002-3-git-send-email-dinguyen@altera.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1369345002-20002-1-git-send-email-dinguyen@altera.com> References: <1369345002-20002-1-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-20130523_173549_942766_13E4C45F X-CRM114-Status: GOOD ( 20.91 ) 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: Mike Turquette , Arnd Bergmann , Pavel Machek , linux@arm.linux.org.uk, Olof Johansson , dinh.linux@gmail.com, Dinh Nguyen 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 Add support to gate the clocks that directly feed peripherals. For clocks with multiple parents, add the ability to determine the correct parent, and also set parents. Also add support to calculate and set the clocks' rate. Signed-off-by: Dinh Nguyen Reviewed-by: Pavel Machek CC: Mike Turquette CC: Arnd Bergmann CC: Olof Johansson Cc: Pavel Machek CC: v3: - Addressed comments from Pavel v2: - Fix space/indent errors - Add streq for strcmp == 0 --- drivers/clk/socfpga/clk.c | 194 ++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 185 insertions(+), 9 deletions(-) diff --git a/drivers/clk/socfpga/clk.c b/drivers/clk/socfpga/clk.c index bd11315..5bb848c 100644 --- a/drivers/clk/socfpga/clk.c +++ b/drivers/clk/socfpga/clk.c @@ -24,15 +24,17 @@ #include /* Clock Manager offsets */ -#define CLKMGR_CTRL 0x0 -#define CLKMGR_BYPASS 0x4 +#define CLKMGR_CTRL 0x0 +#define CLKMGR_BYPASS 0x4 +#define CLKMGR_L4SRC 0x70 +#define CLKMGR_PERPLL_SRC 0xAC /* 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 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 @@ -41,6 +43,17 @@ #define SOCFPGA_PLL_DIVF_SHIFT 3 #define SOCFPGA_PLL_DIVQ_MASK 0x003F0000 #define SOCFPGA_PLL_DIVQ_SHIFT 16 +#define SOCFGPA_MAX_PARENTS 3 + +#define SOCFPGA_L4_MP_CLK "l4_mp_clk" +#define SOCFPGA_L4_SP_CLK "l4_sp_clk" +#define SOCFPGA_NAND_CLK "nand_clk" +#define SOCFPGA_NAND_X_CLK "nand_x_clk" +#define SOCFPGA_MMC_CLK "mmc_clk" +#define SOCFPGA_DB_CLK "gpio_db_clk" + +#define div_mask(width) ((1 << (width)) - 1) +#define streq(a, b) (strcmp((a), (b)) == 0) extern void __iomem *clk_mgr_base_addr; @@ -49,6 +62,9 @@ struct socfpga_clk { char *parent_name; char *clk_name; u32 fixed_div; + void __iomem *div_reg; + u32 width; /* only valid if div_reg != 0 */ + u32 shift; /* only valid if div_reg != 0 */ }; #define to_socfpga_clk(p) container_of(p, struct socfpga_clk, hw.hw) @@ -132,8 +148,9 @@ static __init struct clk *socfpga_clk_init(struct device_node *node, socfpga_clk->hw.hw.init = &init; - if (strcmp(clk_name, "main_pll") || strcmp(clk_name, "periph_pll") || - strcmp(clk_name, "sdram_pll")) { + if (streq(clk_name, "main_pll") || + streq(clk_name, "periph_pll") || + streq(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; @@ -148,6 +165,159 @@ static __init struct clk *socfpga_clk_init(struct device_node *node, return clk; } +static u8 socfpga_clk_get_parent(struct clk_hw *hwclk) +{ + u32 l4_src; + u32 perpll_src; + + if (streq(hwclk->init->name, SOCFPGA_L4_MP_CLK)) { + l4_src = readl(clk_mgr_base_addr + CLKMGR_L4SRC); + return l4_src &= 0x1; + } + if (streq(hwclk->init->name, SOCFPGA_L4_SP_CLK)) { + l4_src = readl(clk_mgr_base_addr + CLKMGR_L4SRC); + return !!(l4_src & 2); + } + + perpll_src = readl(clk_mgr_base_addr + CLKMGR_PERPLL_SRC); + if (streq(hwclk->init->name, SOCFPGA_MMC_CLK)) + return perpll_src &= 0x3; + if (streq(hwclk->init->name, SOCFPGA_NAND_CLK) || + streq(hwclk->init->name, SOCFPGA_NAND_X_CLK)) + return (perpll_src >> 2) & 3; + + /* QSPI clock */ + return (perpll_src >> 4) & 3; + +} + +static int socfpga_clk_set_parent(struct clk_hw *hwclk, u8 parent) +{ + u32 src_reg; + + if (streq(hwclk->init->name, SOCFPGA_L4_MP_CLK)) { + src_reg = readl(clk_mgr_base_addr + CLKMGR_L4SRC); + src_reg &= ~0x1; + src_reg |= parent; + writel(src_reg, clk_mgr_base_addr + CLKMGR_L4SRC); + } else if (streq(hwclk->init->name, SOCFPGA_L4_SP_CLK)) { + src_reg = readl(clk_mgr_base_addr + CLKMGR_L4SRC); + src_reg &= ~0x2; + src_reg |= (parent << 1); + writel(src_reg, clk_mgr_base_addr + CLKMGR_L4SRC); + } else { + src_reg = readl(clk_mgr_base_addr + CLKMGR_PERPLL_SRC); + if (streq(hwclk->init->name, SOCFPGA_MMC_CLK)) { + src_reg &= ~0x3; + src_reg |= parent; + } else if (streq(hwclk->init->name, SOCFPGA_NAND_CLK) || + streq(hwclk->init->name, SOCFPGA_NAND_X_CLK)) { + src_reg &= ~0xC; + src_reg |= (parent << 2); + } else {/* QSPI clock */ + src_reg &= ~0x30; + src_reg |= (parent << 4); + } + writel(src_reg, clk_mgr_base_addr + CLKMGR_PERPLL_SRC); + } + + return 0; +} + +static unsigned long socfpga_clk_recalc_rate(struct clk_hw *hwclk, + unsigned long parent_rate) +{ + struct socfpga_clk *socfpgaclk = to_socfpga_clk(hwclk); + u32 div = 1, val; + + if (socfpgaclk->fixed_div) + div = socfpgaclk->fixed_div; + else if (socfpgaclk->div_reg) { + val = readl(socfpgaclk->div_reg) >> socfpgaclk->shift; + val &= div_mask(socfpgaclk->width); + if (streq(hwclk->init->name, SOCFPGA_DB_CLK)) + div = val + 1; + else + div = (1 << val); + } + + return parent_rate / div; +} + +static struct clk_ops gateclk_ops = { + .recalc_rate = socfpga_clk_recalc_rate, + .get_parent = socfpga_clk_get_parent, + .set_parent = socfpga_clk_set_parent, +}; + +static void __init socfpga_gate_clk_init(struct device_node *node, + const struct clk_ops *ops) +{ + u32 clk_gate[2]; + u32 div_reg[3]; + u32 fixed_div; + struct clk *clk; + struct socfpga_clk *socfpga_clk; + const char *clk_name = node->name; + const char *parent_name[SOCFGPA_MAX_PARENTS]; + struct clk_init_data init; + int rc; + int i = 0; + + socfpga_clk = kzalloc(sizeof(*socfpga_clk), GFP_KERNEL); + if (WARN_ON(!socfpga_clk)) + return; + + rc = of_property_read_u32_array(node, "clk-gate", clk_gate, 2); + if (rc) + clk_gate[0] = 0; + + if (clk_gate[0]) { + socfpga_clk->hw.reg = clk_mgr_base_addr + clk_gate[0]; + socfpga_clk->hw.bit_idx = clk_gate[1]; + + gateclk_ops.enable = clk_gate_ops.enable; + gateclk_ops.disable = clk_gate_ops.disable; + } + + rc = of_property_read_u32(node, "fixed-divider", &fixed_div); + if (rc) + socfpga_clk->fixed_div = 0; + else + socfpga_clk->fixed_div = fixed_div; + + rc = of_property_read_u32_array(node, "div-reg", div_reg, 3); + if (!rc) { + socfpga_clk->div_reg = clk_mgr_base_addr + div_reg[0]; + socfpga_clk->shift = div_reg[1]; + socfpga_clk->width = div_reg[2]; + } else { + socfpga_clk->div_reg = 0; + } + + of_property_read_string(node, "clock-output-names", &clk_name); + + init.name = clk_name; + init.ops = ops; + init.flags = 0; + while (i < SOCFGPA_MAX_PARENTS && (parent_name[i] = + of_clk_get_parent_name(node, i)) != NULL) + i++; + + init.parent_names = parent_name; + init.num_parents = i; + socfpga_clk->hw.hw.init = &init; + + clk = clk_register(NULL, &socfpga_clk->hw.hw); + if (WARN_ON(IS_ERR(clk))) { + kfree(socfpga_clk); + return; + } + rc = of_clk_add_provider(node, of_clk_src_simple_get, clk); + if (WARN_ON(rc)) + return; +} + static void __init socfpga_pll_init(struct device_node *node) { socfpga_clk_init(node, &clk_pll_ops); @@ -160,6 +330,12 @@ static void __init socfpga_periph_init(struct device_node *node) } CLK_OF_DECLARE(socfpga_periph, "altr,socfpga-perip-clk", socfpga_periph_init); +static void __init socfpga_gate_init(struct device_node *node) +{ + socfpga_gate_clk_init(node, &gateclk_ops); +} +CLK_OF_DECLARE(socfpga_gate, "altr,socfpga-gate-clk", socfpga_gate_init); + void __init socfpga_init_clocks(void) { struct clk *clk;