/* * OMAP3-specific clock framework functions * * Copyright (C) 2007-2008 Texas Instruments, Inc. * Copyright (C) 2007-2008 Nokia Corporation * * Written by Paul Walmsley * Testing and integration fixes by Jouni Högander * * Parts of this code are based on code written by * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #undef DEBUG #include <linux/module.h> #include <linux/kernel.h> #include <linux/device.h> #include <linux/list.h> #include <linux/errno.h> #include <linux/delay.h> #include <linux/clk.h> #include <linux/io.h> #include <linux/limits.h> #include <linux/bitops.h> #include <mach/clock.h> #include <mach/sram.h> #include <asm/div64.h> #include <asm/clkdev.h> #include <mach/sdrc.h> #include "clock.h" #include "prm.h" #include "prm-regbits-34xx.h" #include "cm.h" #include "cm-regbits-34xx.h" static const struct clkops clkops_noncore_dpll_ops; #include "clock34xx.h" struct omap_clk { u32 cpu; struct clk_lookup lk; }; #define CLK(dev, con, ck, cp) \ { \ .cpu = cp, \ .lk = { \ .dev_id = dev, \ .con_id = con, \ .clk = ck, \ }, \ } #define CK_343X (1 << 0) #define CK_3430ES1 (1 << 1) #define CK_3430ES2 (1 << 2) static struct omap_clk omap34xx_clks[] = { CLK(NULL, "omap_32k_fck", &omap_32k_fck, CK_343X), CLK(NULL, "virt_12m_ck", &virt_12m_ck, CK_343X), CLK(NULL, "virt_13m_ck", &virt_13m_ck, CK_343X), CLK(NULL, "virt_16_8m_ck", &virt_16_8m_ck, CK_3430ES2), CLK(NULL, "virt_19_2m_ck", &virt_19_2m_ck, CK_343X), CLK(NULL, "virt_26m_ck", &virt_26m_ck, CK_343X), CLK(NULL, "virt_38_4m_ck", &virt_38_4m_ck, CK_343X), CLK(NULL, "osc_sys_ck", &osc_sys_ck, CK_343X), CLK(NULL, "sys_ck", &sys_ck, CK_343X), CLK(NULL, "sys_altclk", &sys_altclk, CK_343X), CLK(NULL, "mcbsp_clks", &mcbsp_clks, CK_343X), CLK(NULL, "sys_clkout1", &sys_clkout1, CK_343X), CLK(NULL, "dpll1_ck", &dpll1_ck, CK_343X), CLK(NULL, "dpll1_x2_ck", &dpll1_x2_ck, CK_343X), CLK(NULL, "dpll1_x2m2_ck", &dpll1_x2m2_ck, CK_343X), CLK(NULL, "dpll2_ck", &dpll2_ck, CK_343X), CLK(NULL, "dpll2_m2_ck", &dpll2_m2_ck, CK_343X), CLK(NULL, "dpll3_ck", &dpll3_ck, CK_343X), CLK(NULL, "core_ck", &core_ck, CK_343X), CLK(NULL, "dpll3_x2_ck", &dpll3_x2_ck, CK_343X), CLK(NULL, "dpll3_m2_ck", &dpll3_m2_ck, CK_343X), CLK(NULL, "dpll3_m2x2_ck", &dpll3_m2x2_ck, CK_343X), CLK(NULL, "dpll3_m3_ck", &dpll3_m3_ck, CK_343X), CLK(NULL, "dpll3_m3x2_ck", &dpll3_m3x2_ck, CK_343X), CLK(NULL, "emu_core_alwon_ck", &emu_core_alwon_ck, CK_343X), CLK(NULL, "dpll4_ck", &dpll4_ck, CK_343X), CLK(NULL, "dpll4_x2_ck", &dpll4_x2_ck, CK_343X), CLK(NULL, "omap_96m_alwon_fck", &omap_96m_alwon_fck, CK_343X), CLK(NULL, "omap_96m_fck", &omap_96m_fck, CK_343X), CLK(NULL, "cm_96m_fck", &cm_96m_fck, CK_343X), CLK(NULL, "omap_54m_fck", &omap_54m_fck, CK_343X), CLK(NULL, "omap_48m_fck", &omap_48m_fck, CK_343X), CLK(NULL, "omap_12m_fck", &omap_12m_fck, CK_343X), CLK(NULL, "dpll4_m2_ck", &dpll4_m2_ck, CK_343X), CLK(NULL, "dpll4_m2x2_ck", &dpll4_m2x2_ck, CK_343X), CLK(NULL, "dpll4_m3_ck", &dpll4_m3_ck, CK_343X), CLK(NULL, "dpll4_m3x2_ck", &dpll4_m3x2_ck, CK_343X), CLK(NULL, "dpll4_m4_ck", &dpll4_m4_ck, CK_343X), CLK(NULL, "dpll4_m4x2_ck", &dpll4_m4x2_ck, CK_343X), CLK(NULL, "dpll4_m5_ck", &dpll4_m5_ck, CK_343X), CLK(NULL, "dpll4_m5x2_ck", &dpll4_m5x2_ck, CK_343X), CLK(NULL, "dpll4_m6_ck", &dpll4_m6_ck, CK_343X), CLK(NULL, "dpll4_m6x2_ck", &dpll4_m6x2_ck, CK_343X), CLK(NULL, "emu_per_alwon_ck", &emu_per_alwon_ck, CK_343X), CLK(NULL, "dpll5_ck", &dpll5_ck, CK_3430ES2), CLK(NULL, "dpll5_m2_ck", &dpll5_m2_ck, CK_3430ES2), CLK(NULL, "clkout2_src_ck", &clkout2_src_ck, CK_343X), CLK(NULL, "sys_clkout2", &sys_clkout2, CK_343X), CLK(NULL, "corex2_fck", &corex2_fck, CK_343X), CLK(NULL, "dpll1_fck", &dpll1_fck, CK_343X), CLK(NULL, "mpu_ck", &mpu_ck, CK_343X), CLK(NULL, "arm_fck", &arm_fck, CK_343X), CLK(NULL, "emu_mpu_alwon_ck", &emu_mpu_alwon_ck, CK_343X), CLK(NULL, "dpll2_fck", &dpll2_fck, CK_343X), CLK(NULL, "iva2_ck", &iva2_ck, CK_343X), CLK(NULL, "l3_ick", &l3_ick, CK_343X), CLK(NULL, "l4_ick", &l4_ick, CK_343X), CLK(NULL, "rm_ick", &rm_ick, CK_343X), CLK(NULL, "gfx_l3_ck", &gfx_l3_ck, CK_3430ES1), CLK(NULL, "gfx_l3_fck", &gfx_l3_fck, CK_3430ES1), CLK(NULL, "gfx_l3_ick", &gfx_l3_ick, CK_3430ES1), CLK(NULL, "gfx_cg1_ck", &gfx_cg1_ck, CK_3430ES1), CLK(NULL, "gfx_cg2_ck", &gfx_cg2_ck, CK_3430ES1), CLK(NULL, "sgx_fck", &sgx_fck, CK_3430ES2), CLK(NULL, "sgx_ick", &sgx_ick, CK_3430ES2), CLK(NULL, "d2d_26m_fck", &d2d_26m_fck, CK_3430ES1), CLK(NULL, "modem_fck", &modem_fck, CK_343X), CLK(NULL, "sad2d_ick", &sad2d_ick, CK_343X), CLK(NULL, "mad2d_ick", &mad2d_ick, CK_343X), CLK(NULL, "gpt10_fck", &gpt10_fck, CK_343X), CLK(NULL, "gpt11_fck", &gpt11_fck, CK_343X), CLK(NULL, "cpefuse_fck", &cpefuse_fck, CK_3430ES2), CLK(NULL, "ts_fck", &ts_fck, CK_3430ES2), CLK(NULL, "usbtll_fck", &usbtll_fck, CK_3430ES2), CLK(NULL, "core_96m_fck", &core_96m_fck, CK_343X), CLK("mmci-omap-hs.2", "fck", &mmchs3_fck, CK_3430ES2), CLK("mmci-omap-hs.1", "fck", &mmchs2_fck, CK_343X), CLK(NULL, "mspro_fck", &mspro_fck, CK_343X), CLK("mmci-omap-hs.0", "fck", &mmchs1_fck, CK_343X), CLK("i2c_omap.3", "fck", &i2c3_fck, CK_343X), CLK("i2c_omap.2", "fck", &i2c2_fck, CK_343X), CLK("i2c_omap.1", "fck", &i2c1_fck, CK_343X), CLK("omap-mcbsp.5", "fck", &mcbsp5_fck, CK_343X), CLK("omap-mcbsp.1", "fck", &mcbsp1_fck, CK_343X), CLK(NULL, "core_48m_fck", &core_48m_fck, CK_343X), CLK("omap2_mcspi.4", "fck", &mcspi4_fck, CK_343X), CLK("omap2_mcspi.3", "fck", &mcspi3_fck, CK_343X), CLK("omap2_mcspi.2", "fck", &mcspi2_fck, CK_343X), CLK("omap2_mcspi.1", "fck", &mcspi1_fck, CK_343X), CLK(NULL, "uart2_fck", &uart2_fck, CK_343X), CLK(NULL, "uart1_fck", &uart1_fck, CK_343X), CLK(NULL, "fshostusb_fck", &fshostusb_fck, CK_3430ES1), CLK(NULL, "core_12m_fck", &core_12m_fck, CK_343X), CLK("omap_hdq.0", "fck", &hdq_fck, CK_343X), CLK(NULL, "ssi_ssr_fck", &ssi_ssr_fck, CK_343X), CLK(NULL, "ssi_sst_fck", &ssi_sst_fck, CK_343X), CLK(NULL, "core_l3_ick", &core_l3_ick, CK_343X), CLK("musb_hdrc", "ick", &hsotgusb_ick, CK_343X), CLK(NULL, "sdrc_ick", &sdrc_ick, CK_343X), CLK(NULL, "gpmc_fck", &gpmc_fck, CK_343X), CLK(NULL, "security_l3_ick", &security_l3_ick, CK_343X), CLK(NULL, "pka_ick", &pka_ick, CK_343X), CLK(NULL, "core_l4_ick", &core_l4_ick, CK_343X), CLK(NULL, "usbtll_ick", &usbtll_ick, CK_3430ES2), CLK("mmci-omap-hs.2", "ick", &mmchs3_ick, CK_3430ES2), CLK(NULL, "icr_ick", &icr_ick, CK_343X), CLK(NULL, "aes2_ick", &aes2_ick, CK_343X), CLK(NULL, "sha12_ick", &sha12_ick, CK_343X), CLK(NULL, "des2_ick", &des2_ick, CK_343X), CLK("mmci-omap-hs.1", "ick", &mmchs2_ick, CK_343X), CLK("mmci-omap-hs.0", "ick", &mmchs1_ick, CK_343X), CLK(NULL, "mspro_ick", &mspro_ick, CK_343X), CLK("omap_hdq.0", "ick", &hdq_ick, CK_343X), CLK("omap2_mcspi.4", "ick", &mcspi4_ick, CK_343X), CLK("omap2_mcspi.3", "ick", &mcspi3_ick, CK_343X), CLK("omap2_mcspi.2", "ick", &mcspi2_ick, CK_343X), CLK("omap2_mcspi.1", "ick", &mcspi1_ick, CK_343X), CLK("i2c_omap.3", "ick", &i2c3_ick, CK_343X), CLK("i2c_omap.2", "ick", &i2c2_ick, CK_343X), CLK("i2c_omap.1", "ick", &i2c1_ick, CK_343X), CLK(NULL, "uart2_ick", &uart2_ick, CK_343X), CLK(NULL, "uart1_ick", &uart1_ick, CK_343X), CLK(NULL, "gpt11_ick", &gpt11_ick, CK_343X), CLK(NULL, "gpt10_ick", &gpt10_ick, CK_343X), CLK("omap-mcbsp.5", "ick", &mcbsp5_ick, CK_343X), CLK("omap-mcbsp.1", "ick", &mcbsp1_ick, CK_343X), CLK(NULL, "fac_ick", &fac_ick, CK_3430ES1), CLK(NULL, "mailboxes_ick", &mailboxes_ick, CK_343X), CLK(NULL, "omapctrl_ick", &omapctrl_ick, CK_343X), CLK(NULL, "ssi_l4_ick", &ssi_l4_ick, CK_343X), CLK(NULL, "ssi_ick", &ssi_ick, CK_343X), CLK(NULL, "usb_l4_ick", &usb_l4_ick, CK_3430ES1), CLK(NULL, "security_l4_ick2", &security_l4_ick2, CK_343X), CLK(NULL, "aes1_ick", &aes1_ick, CK_343X), CLK("omap_rng", "ick", &rng_ick, CK_343X), CLK(NULL, "sha11_ick", &sha11_ick, CK_343X), CLK(NULL, "des1_ick", &des1_ick, CK_343X), CLK("omapfb", "dss1_fck", &dss1_alwon_fck, CK_343X), CLK("omapfb", "tv_fck", &dss_tv_fck, CK_343X), CLK("omapfb", "video_fck", &dss_96m_fck, CK_343X), CLK("omapfb", "dss2_fck", &dss2_alwon_fck, CK_343X), CLK("omapfb", "ick", &dss_ick, CK_343X), CLK(NULL, "cam_mclk", &cam_mclk, CK_343X), CLK(NULL, "cam_ick", &cam_ick, CK_343X), CLK(NULL, "csi2_96m_fck", &csi2_96m_fck, CK_343X), CLK(NULL, "usbhost_120m_fck", &usbhost_120m_fck, CK_3430ES2), CLK(NULL, "usbhost_48m_fck", &usbhost_48m_fck, CK_3430ES2), CLK(NULL, "usbhost_ick", &usbhost_ick, CK_3430ES2), CLK(NULL, "usim_fck", &usim_fck, CK_3430ES2), CLK(NULL, "gpt1_fck", &gpt1_fck, CK_343X), CLK(NULL, "wkup_32k_fck", &wkup_32k_fck, CK_343X), CLK(NULL, "gpio1_dbck", &gpio1_dbck, CK_343X), CLK("omap_wdt", "fck", &wdt2_fck, CK_343X), CLK(NULL, "wkup_l4_ick", &wkup_l4_ick, CK_343X), CLK(NULL, "usim_ick", &usim_ick, CK_3430ES2), CLK("omap_wdt", "ick", &wdt2_ick, CK_343X), CLK(NULL, "wdt1_ick", &wdt1_ick, CK_343X), CLK(NULL, "gpio1_ick", &gpio1_ick, CK_343X), CLK(NULL, "omap_32ksync_ick", &omap_32ksync_ick, CK_343X), CLK(NULL, "gpt12_ick", &gpt12_ick, CK_343X), CLK(NULL, "gpt1_ick", &gpt1_ick, CK_343X), CLK(NULL, "per_96m_fck", &per_96m_fck, CK_343X), CLK(NULL, "per_48m_fck", &per_48m_fck, CK_343X), CLK(NULL, "uart3_fck", &uart3_fck, CK_343X), CLK(NULL, "gpt2_fck", &gpt2_fck, CK_343X), CLK(NULL, "gpt3_fck", &gpt3_fck, CK_343X), CLK(NULL, "gpt4_fck", &gpt4_fck, CK_343X), CLK(NULL, "gpt5_fck", &gpt5_fck, CK_343X), CLK(NULL, "gpt6_fck", &gpt6_fck, CK_343X), CLK(NULL, "gpt7_fck", &gpt7_fck, CK_343X), CLK(NULL, "gpt8_fck", &gpt8_fck, CK_343X), CLK(NULL, "gpt9_fck", &gpt9_fck, CK_343X), CLK(NULL, "per_32k_alwon_fck", &per_32k_alwon_fck, CK_343X), CLK(NULL, "gpio6_dbck", &gpio6_dbck, CK_343X), CLK(NULL, "gpio5_dbck", &gpio5_dbck, CK_343X), CLK(NULL, "gpio4_dbck", &gpio4_dbck, CK_343X), CLK(NULL, "gpio3_dbck", &gpio3_dbck, CK_343X), CLK(NULL, "gpio2_dbck", &gpio2_dbck, CK_343X), CLK(NULL, "wdt3_fck", &wdt3_fck, CK_343X), CLK(NULL, "per_l4_ick", &per_l4_ick, CK_343X), CLK(NULL, "gpio6_ick", &gpio6_ick, CK_343X), CLK(NULL, "gpio5_ick", &gpio5_ick, CK_343X), CLK(NULL, "gpio4_ick", &gpio4_ick, CK_343X), CLK(NULL, "gpio3_ick", &gpio3_ick, CK_343X), CLK(NULL, "gpio2_ick", &gpio2_ick, CK_343X), CLK(NULL, "wdt3_ick", &wdt3_ick, CK_343X), CLK(NULL, "uart3_ick", &uart3_ick, CK_343X), CLK(NULL, "gpt9_ick", &gpt9_ick, CK_343X), CLK(NULL, "gpt8_ick", &gpt8_ick, CK_343X), CLK(NULL, "gpt7_ick", &gpt7_ick, CK_343X), CLK(NULL, "gpt6_ick", &gpt6_ick, CK_343X), CLK(NULL, "gpt5_ick", &gpt5_ick, CK_343X), CLK(NULL, "gpt4_ick", &gpt4_ick, CK_343X), CLK(NULL, "gpt3_ick", &gpt3_ick, CK_343X), CLK(NULL, "gpt2_ick", &gpt2_ick, CK_343X), CLK("omap-mcbsp.2", "ick", &mcbsp2_ick, CK_343X), CLK("omap-mcbsp.3", "ick", &mcbsp3_ick, CK_343X), CLK("omap-mcbsp.4", "ick", &mcbsp4_ick, CK_343X), CLK("omap-mcbsp.2", "fck", &mcbsp2_fck, CK_343X), CLK("omap-mcbsp.3", "fck", &mcbsp3_fck, CK_343X), CLK("omap-mcbsp.4", "fck", &mcbsp4_fck, CK_343X), CLK(NULL, "emu_src_ck", &emu_src_ck, CK_343X), CLK(NULL, "pclk_fck", &pclk_fck, CK_343X), CLK(NULL, "pclkx2_fck", &pclkx2_fck, CK_343X), CLK(NULL, "atclk_fck", &atclk_fck, CK_343X), CLK(NULL, "traceclk_src_fck", &traceclk_src_fck, CK_343X), CLK(NULL, "traceclk_fck", &traceclk_fck, CK_343X), CLK(NULL, "sr1_fck", &sr1_fck, CK_343X), CLK(NULL, "sr2_fck", &sr2_fck, CK_343X), CLK(NULL, "sr_l4_ick", &sr_l4_ick, CK_343X), CLK(NULL, "secure_32k_fck", &secure_32k_fck, CK_343X), CLK(NULL, "gpt12_fck", &gpt12_fck, CK_343X), CLK(NULL, "wdt1_fck", &wdt1_fck, CK_343X), }; /* CM_AUTOIDLE_PLL*.AUTO_* bit values */ #define DPLL_AUTOIDLE_DISABLE 0x0 #define DPLL_AUTOIDLE_LOW_POWER_STOP 0x1 #define MAX_DPLL_WAIT_TRIES 1000000 #define MIN_SDRC_DLL_LOCK_FREQ 83000000 #define CYCLES_PER_MHZ 1000000 /* Scale factor for fixed-point arith in omap3_core_dpll_m2_set_rate() */ #define SDRC_MPURATE_SCALE 8 /* 2^SDRC_MPURATE_BASE_SHIFT: MPU MHz that SDRC_MPURATE_LOOPS is defined for */ #define SDRC_MPURATE_BASE_SHIFT 9 /* * SDRC_MPURATE_LOOPS: Number of MPU loops to execute at * 2^MPURATE_BASE_SHIFT MHz for SDRC to stabilize */ #define SDRC_MPURATE_LOOPS 96 /** * omap3_dpll_recalc - recalculate DPLL rate * @clk: DPLL struct clk * * Recalculate and propagate the DPLL rate. */ static unsigned long omap3_dpll_recalc(struct clk *clk) { return omap2_get_dpll_rate(clk); } /* _omap3_dpll_write_clken - write clken_bits arg to a DPLL's enable bits */ static void _omap3_dpll_write_clken(struct clk *clk, u8 clken_bits) { const struct dpll_data *dd; u32 v; dd = clk->dpll_data; v = __raw_readl(dd->control_reg); v &= ~dd->enable_mask; v |= clken_bits << __ffs(dd->enable_mask); __raw_writel(v, dd->control_reg); } /* _omap3_wait_dpll_status: wait for a DPLL to enter a specific state */ static int _omap3_wait_dpll_status(struct clk *clk, u8 state) { const struct dpll_data *dd; int i = 0; int ret = -EINVAL; dd = clk->dpll_data; state <<= __ffs(dd->idlest_mask); while (((__raw_readl(dd->idlest_reg) & dd->idlest_mask) != state) && i < MAX_DPLL_WAIT_TRIES) { i++; udelay(1); } if (i == MAX_DPLL_WAIT_TRIES) { printk(KERN_ERR "clock: %s failed transition to '%s'\n", clk->name, (state) ? "locked" : "bypassed"); } else { pr_debug("clock: %s transition to '%s' in %d loops\n", clk->name, (state) ? "locked" : "bypassed", i); ret = 0; } return ret; } /* From 3430 TRM ES2 4.7.6.2 */ static u16 _omap3_dpll_compute_freqsel(struct clk *clk, u8 n) { unsigned long fint; u16 f = 0; fint = clk->dpll_data->clk_ref->rate / (n + 1); pr_debug("clock: fint is %lu\n", fint); if (fint >= 750000 && fint <= 1000000) f = 0x3; else if (fint > 1000000 && fint <= 1250000) f = 0x4; else if (fint > 1250000 && fint <= 1500000) f = 0x5; else if (fint > 1500000 && fint <= 1750000) f = 0x6; else if (fint > 1750000 && fint <= 2100000) f = 0x7; else if (fint > 7500000 && fint <= 10000000) f = 0xB; else if (fint > 10000000 && fint <= 12500000) f = 0xC; else if (fint > 12500000 && fint <= 15000000) f = 0xD; else if (fint > 15000000 && fint <= 17500000) f = 0xE; else if (fint > 17500000 && fint <= 21000000) f = 0xF; else pr_debug("clock: unknown freqsel setting for %d\n", n); return f; } /* Non-CORE DPLL (e.g., DPLLs that do not control SDRC) clock functions */ /* * _omap3_noncore_dpll_lock - instruct a DPLL to lock and wait for readiness * @clk: pointer to a DPLL struct clk * * Instructs a non-CORE DPLL to lock. Waits for the DPLL to report * readiness before returning. Will save and restore the DPLL's * autoidle state across the enable, per the CDP code. If the DPLL * locked successfully, return 0; if the DPLL did not lock in the time * allotted, or DPLL3 was passed in, return -EINVAL. */ static int _omap3_noncore_dpll_lock(struct clk *clk) { u8 ai; int r; if (clk == &dpll3_ck) return -EINVAL; pr_debug("clock: locking DPLL %s\n", clk->name); ai = omap3_dpll_autoidle_read(clk); omap3_dpll_deny_idle(clk); _omap3_dpll_write_clken(clk, DPLL_LOCKED); r = _omap3_wait_dpll_status(clk, 1); if (ai) omap3_dpll_allow_idle(clk); return r; } /* * _omap3_noncore_dpll_bypass - instruct a DPLL to bypass and wait for readiness * @clk: pointer to a DPLL struct clk * * Instructs a non-CORE DPLL to enter low-power bypass mode. In * bypass mode, the DPLL's rate is set equal to its parent clock's * rate. Waits for the DPLL to report readiness before returning. * Will save and restore the DPLL's autoidle state across the enable, * per the CDP code. If the DPLL entered bypass mode successfully, * return 0; if the DPLL did not enter bypass in the time allotted, or * DPLL3 was passed in, or the DPLL does not support low-power bypass, * return -EINVAL. */ static int _omap3_noncore_dpll_bypass(struct clk *clk) { int r; u8 ai; if (clk == &dpll3_ck) return -EINVAL; if (!(clk->dpll_data->modes & (1 << DPLL_LOW_POWER_BYPASS))) return -EINVAL; pr_debug("clock: configuring DPLL %s for low-power bypass\n", clk->name); ai = omap3_dpll_autoidle_read(clk); _omap3_dpll_write_clken(clk, DPLL_LOW_POWER_BYPASS); r = _omap3_wait_dpll_status(clk, 0); if (ai) omap3_dpll_allow_idle(clk); else omap3_dpll_deny_idle(clk); return r; } /* * _omap3_noncore_dpll_stop - instruct a DPLL to stop * @clk: pointer to a DPLL struct clk * * Instructs a non-CORE DPLL to enter low-power stop. Will save and * restore the DPLL's autoidle state across the stop, per the CDP * code. If DPLL3 was passed in, or the DPLL does not support * low-power stop, return -EINVAL; otherwise, return 0. */ static int _omap3_noncore_dpll_stop(struct clk *clk) { u8 ai; if (clk == &dpll3_ck) return -EINVAL; if (!(clk->dpll_data->modes & (1 << DPLL_LOW_POWER_STOP))) return -EINVAL; pr_debug("clock: stopping DPLL %s\n", clk->name); ai = omap3_dpll_autoidle_read(clk); _omap3_dpll_write_clken(clk, DPLL_LOW_POWER_STOP); if (ai) omap3_dpll_allow_idle(clk); else omap3_dpll_deny_idle(clk); return 0; } /** * omap3_noncore_dpll_enable - instruct a DPLL to enter bypass or lock mode * @clk: pointer to a DPLL struct clk * * Instructs a non-CORE DPLL to enable, e.g., to enter bypass or lock. * The choice of modes depends on the DPLL's programmed rate: if it is * the same as the DPLL's parent clock, it will enter bypass; * otherwise, it will enter lock. This code will wait for the DPLL to * indicate readiness before returning, unless the DPLL takes too long * to enter the target state. Intended to be used as the struct clk's * enable function. If DPLL3 was passed in, or the DPLL does not * support low-power stop, or if the DPLL took too long to enter * bypass or lock, return -EINVAL; otherwise, return 0. */ static int omap3_noncore_dpll_enable(struct clk *clk) { int r; struct dpll_data *dd; if (clk == &dpll3_ck) return -EINVAL; dd = clk->dpll_data; if (!dd) return -EINVAL; if (clk->rate == dd->clk_bypass->rate) { WARN_ON(clk->parent != dd->clk_bypass); r = _omap3_noncore_dpll_bypass(clk); } else { WARN_ON(clk->parent != dd->clk_ref); r = _omap3_noncore_dpll_lock(clk); } /* FIXME: this is dubious - if clk->rate has changed, what about propagating? */ if (!r) clk->rate = omap2_get_dpll_rate(clk); return r; } /** * omap3_noncore_dpll_enable - instruct a DPLL to enter bypass or lock mode * @clk: pointer to a DPLL struct clk * * Instructs a non-CORE DPLL to enable, e.g., to enter bypass or lock. * The choice of modes depends on the DPLL's programmed rate: if it is * the same as the DPLL's parent clock, it will enter bypass; * otherwise, it will enter lock. This code will wait for the DPLL to * indicate readiness before returning, unless the DPLL takes too long * to enter the target state. Intended to be used as the struct clk's * enable function. If DPLL3 was passed in, or the DPLL does not * support low-power stop, or if the DPLL took too long to enter * bypass or lock, return -EINVAL; otherwise, return 0. */ static void omap3_noncore_dpll_disable(struct clk *clk) { if (clk == &dpll3_ck) return; _omap3_noncore_dpll_stop(clk); } /* Non-CORE DPLL rate set code */ /* * omap3_noncore_dpll_program - set non-core DPLL M,N values directly * @clk: struct clk * of DPLL to set * @m: DPLL multiplier to set * @n: DPLL divider to set * @freqsel: FREQSEL value to set * * Program the DPLL with the supplied M, N values, and wait for the DPLL to * lock.. Returns -EINVAL upon error, or 0 upon success. */ static int omap3_noncore_dpll_program(struct clk *clk, u16 m, u8 n, u16 freqsel) { struct dpll_data *dd = clk->dpll_data; u32 v; /* 3430 ES2 TRM: 4.7.6.9 DPLL Programming Sequence */ _omap3_noncore_dpll_bypass(clk); /* Set jitter correction */ v = __raw_readl(dd->control_reg); v &= ~dd->freqsel_mask; v |= freqsel << __ffs(dd->freqsel_mask); __raw_writel(v, dd->control_reg); /* Set DPLL multiplier, divider */ v = __raw_readl(dd->mult_div1_reg); v &= ~(dd->mult_mask | dd->div1_mask); v |= m << __ffs(dd->mult_mask); v |= (n - 1) << __ffs(dd->div1_mask); __raw_writel(v, dd->mult_div1_reg); /* We let the clock framework set the other output dividers later */ /* REVISIT: Set ramp-up delay? */ _omap3_noncore_dpll_lock(clk); return 0; } /** * omap3_noncore_dpll_set_rate - set non-core DPLL rate * @clk: struct clk * of DPLL to set * @rate: rounded target rate * * Set the DPLL CLKOUT to the target rate. If the DPLL can enter * low-power bypass, and the target rate is the bypass source clock * rate, then configure the DPLL for bypass. Otherwise, round the * target rate if it hasn't been done already, then program and lock * the DPLL. Returns -EINVAL upon error, or 0 upon success. */ static int omap3_noncore_dpll_set_rate(struct clk *clk, unsigned long rate) { struct clk *new_parent = NULL; u16 freqsel; struct dpll_data *dd; int ret; if (!clk || !rate) return -EINVAL; dd = clk->dpll_data; if (!dd) return -EINVAL; if (rate == omap2_get_dpll_rate(clk)) return 0; /* * Ensure both the bypass and ref clocks are enabled prior to * doing anything; we need the bypass clock running to reprogram * the DPLL. */ omap2_clk_enable(dd->clk_bypass); omap2_clk_enable(dd->clk_ref); if (dd->clk_bypass->rate == rate && (clk->dpll_data->modes & (1 << DPLL_LOW_POWER_BYPASS))) { pr_debug("clock: %s: set rate: entering bypass.\n", clk->name); ret = _omap3_noncore_dpll_bypass(clk); if (!ret) new_parent = dd->clk_bypass; } else { if (dd->last_rounded_rate != rate) omap2_dpll_round_rate(clk, rate); if (dd->last_rounded_rate == 0) return -EINVAL; freqsel = _omap3_dpll_compute_freqsel(clk, dd->last_rounded_n); if (!freqsel) WARN_ON(1); pr_debug("clock: %s: set rate: locking rate to %lu.\n", clk->name, rate); ret = omap3_noncore_dpll_program(clk, dd->last_rounded_m, dd->last_rounded_n, freqsel); if (!ret) new_parent = dd->clk_ref; } if (!ret) { /* * Switch the parent clock in the heirarchy, and make sure * that the new parent's usecount is correct. Note: we * enable the new parent before disabling the old to avoid * any unnecessary hardware disable->enable transitions. */ if (clk->usecount) { omap2_clk_enable(new_parent); omap2_clk_disable(clk->parent); } clk_reparent(clk, new_parent); clk->rate = rate; } omap2_clk_disable(dd->clk_ref); omap2_clk_disable(dd->clk_bypass); return 0; } static int omap3_dpll4_set_rate(struct clk *clk, unsigned long rate) { /* * According to the 12-5 CDP code from TI, "Limitation 2.5" * on 3430ES1 prevents us from changing DPLL multipliers or dividers * on DPLL4. */ if (omap_rev() == OMAP3430_REV_ES1_0) { printk(KERN_ERR "clock: DPLL4 cannot change rate due to " "silicon 'Limitation 2.5' on 3430ES1.\n"); return -EINVAL; } return omap3_noncore_dpll_set_rate(clk, rate); } /* * CORE DPLL (DPLL3) rate programming functions * * These call into SRAM code to do the actual CM writes, since the SDRAM * is clocked from DPLL3. */ /** * omap3_core_dpll_m2_set_rate - set CORE DPLL M2 divider * @clk: struct clk * of DPLL to set * @rate: rounded target rate * * Program the DPLL M2 divider with the rounded target rate. Returns * -EINVAL upon error, or 0 upon success. */ static int omap3_core_dpll_m2_set_rate(struct clk *clk, unsigned long rate) { u32 new_div = 0; u32 unlock_dll = 0; u32 c; unsigned long validrate, sdrcrate, mpurate; struct omap_sdrc_params *sp; if (!clk || !rate) return -EINVAL; if (clk != &dpll3_m2_ck) return -EINVAL; validrate = omap2_clksel_round_rate_div(clk, rate, &new_div); if (validrate != rate) return -EINVAL; sdrcrate = sdrc_ick.rate; if (rate > clk->rate) sdrcrate <<= ((rate / clk->rate) >> 1); else sdrcrate >>= ((clk->rate / rate) >> 1); sp = omap2_sdrc_get_params(sdrcrate); if (!sp) return -EINVAL; if (sdrcrate < MIN_SDRC_DLL_LOCK_FREQ) { pr_debug("clock: will unlock SDRC DLL\n"); unlock_dll = 1; } /* * XXX This only needs to be done when the CPU frequency changes */ mpurate = arm_fck.rate / CYCLES_PER_MHZ; c = (mpurate << SDRC_MPURATE_SCALE) >> SDRC_MPURATE_BASE_SHIFT; c += 1; /* for safety */ c *= SDRC_MPURATE_LOOPS; c >>= SDRC_MPURATE_SCALE; if (c == 0) c = 1; pr_debug("clock: changing CORE DPLL rate from %lu to %lu\n", clk->rate, validrate); pr_debug("clock: SDRC timing params used: %08x %08x %08x\n", sp->rfr_ctrl, sp->actim_ctrla, sp->actim_ctrlb); omap3_configure_core_dpll(sp->rfr_ctrl, sp->actim_ctrla, sp->actim_ctrlb, new_div, unlock_dll, c, sp->mr, rate > clk->rate); return 0; } static const struct clkops clkops_noncore_dpll_ops = { .enable = &omap3_noncore_dpll_enable, .disable = &omap3_noncore_dpll_disable, }; /* DPLL autoidle read/set code */ /** * omap3_dpll_autoidle_read - read a DPLL's autoidle bits * @clk: struct clk * of the DPLL to read * * Return the DPLL's autoidle bits, shifted down to bit 0. Returns * -EINVAL if passed a null pointer or if the struct clk does not * appear to refer to a DPLL. */ static u32 omap3_dpll_autoidle_read(struct clk *clk) { const struct dpll_data *dd; u32 v; if (!clk || !clk->dpll_data) return -EINVAL; dd = clk->dpll_data; v = __raw_readl(dd->autoidle_reg); v &= dd->autoidle_mask; v >>= __ffs(dd->autoidle_mask); return v; } /** * omap3_dpll_allow_idle - enable DPLL autoidle bits * @clk: struct clk * of the DPLL to operate on * * Enable DPLL automatic idle control. This automatic idle mode * switching takes effect only when the DPLL is locked, at least on * OMAP3430. The DPLL will enter low-power stop when its downstream * clocks are gated. No return value. */ static void omap3_dpll_allow_idle(struct clk *clk) { const struct dpll_data *dd; u32 v; if (!clk || !clk->dpll_data) return; dd = clk->dpll_data; /* * REVISIT: CORE DPLL can optionally enter low-power bypass * by writing 0x5 instead of 0x1. Add some mechanism to * optionally enter this mode. */ v = __raw_readl(dd->autoidle_reg); v &= ~dd->autoidle_mask; v |= DPLL_AUTOIDLE_LOW_POWER_STOP << __ffs(dd->autoidle_mask); __raw_writel(v, dd->autoidle_reg); } /** * omap3_dpll_deny_idle - prevent DPLL from automatically idling * @clk: struct clk * of the DPLL to operate on * * Disable DPLL automatic idle control. No return value. */ static void omap3_dpll_deny_idle(struct clk *clk) { const struct dpll_data *dd; u32 v; if (!clk || !clk->dpll_data) return; dd = clk->dpll_data; v = __raw_readl(dd->autoidle_reg); v &= ~dd->autoidle_mask; v |= DPLL_AUTOIDLE_DISABLE << __ffs(dd->autoidle_mask); __raw_writel(v, dd->autoidle_reg); } /* Clock control for DPLL outputs */ /** * omap3_clkoutx2_recalc - recalculate DPLL X2 output virtual clock rate * @clk: DPLL output struct clk * * Using parent clock DPLL data, look up DPLL state. If locked, set our * rate to the dpll_clk * 2; otherwise, just use dpll_clk. */ static unsigned long omap3_clkoutx2_recalc(struct clk *clk) { const struct dpll_data *dd; unsigned long rate; u32 v; struct clk *pclk; /* Walk up the parents of clk, looking for a DPLL */ pclk = clk->parent; while (pclk && !pclk->dpll_data) pclk = pclk->parent; /* clk does not have a DPLL as a parent? */ WARN_ON(!pclk); dd = pclk->dpll_data; WARN_ON(!dd->enable_mask); v = __raw_readl(dd->control_reg) & dd->enable_mask; v >>= __ffs(dd->enable_mask); if (v != OMAP3XXX_EN_DPLL_LOCKED) rate = clk->parent->rate; else rate = clk->parent->rate * 2; return rate; } /* Common clock code */ /* * As it is structured now, this will prevent an OMAP2/3 multiboot * kernel from compiling. This will need further attention. */ #if defined(CONFIG_ARCH_OMAP3) static struct clk_functions omap2_clk_functions = { .clk_enable = omap2_clk_enable, .clk_disable = omap2_clk_disable, .clk_round_rate = omap2_clk_round_rate, .clk_set_rate = omap2_clk_set_rate, .clk_set_parent = omap2_clk_set_parent, .clk_disable_unused = omap2_clk_disable_unused, }; /* * Set clocks for bypass mode for reboot to work. */ void omap2_clk_prepare_for_reboot(void) { /* REVISIT: Not ready for 343x */ #if 0 u32 rate; if (vclk == NULL || sclk == NULL) return; rate = clk_get_rate(sclk); clk_set_rate(vclk, rate); #endif } /* REVISIT: Move this init stuff out into clock.c */ /* * Switch the MPU rate if specified on cmdline. * We cannot do this early until cmdline is parsed. */ static int __init omap2_clk_arch_init(void) { if (!mpurate) return -EINVAL; /* REVISIT: not yet ready for 343x */ #if 0 if (clk_set_rate(&virt_prcm_set, mpurate)) printk(KERN_ERR "Could not find matching MPU rate\n"); #endif recalculate_root_clocks(); printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL3/MPU): " "%ld.%01ld/%ld/%ld MHz\n", (osc_sys_ck.rate / 1000000), (osc_sys_ck.rate / 100000) % 10, (core_ck.rate / 1000000), (dpll1_fck.rate / 1000000)) ; return 0; } arch_initcall(omap2_clk_arch_init); int __init omap2_clk_init(void) { /* struct prcm_config *prcm; */ struct omap_clk *c; /* u32 clkrate; */ u32 cpu_clkflg; if (cpu_is_omap34xx()) { cpu_mask = RATE_IN_343X; cpu_clkflg = CK_343X; /* * Update this if there are further clock changes between ES2 * and production parts */ if (omap_rev() == OMAP3430_REV_ES1_0) { /* No 3430ES1-only rates exist, so no RATE_IN_3430ES1 */ cpu_clkflg |= CK_3430ES1; } else { cpu_mask |= RATE_IN_3430ES2; cpu_clkflg |= CK_3430ES2; } } clk_init(&omap2_clk_functions); for (c = omap34xx_clks; c < omap34xx_clks + ARRAY_SIZE(omap34xx_clks); c++) clk_preinit(c->lk.clk); for (c = omap34xx_clks; c < omap34xx_clks + ARRAY_SIZE(omap34xx_clks); c++) if (c->cpu & cpu_clkflg) { clkdev_add(&c->lk); clk_register(c->lk.clk); omap2_init_clk_clkdm(c->lk.clk); } /* REVISIT: Not yet ready for OMAP3 */ #if 0 /* Check the MPU rate set by bootloader */ clkrate = omap2_get_dpll_rate_24xx(&dpll_ck); for (prcm = rate_table; prcm->mpu_speed; prcm++) { if (!(prcm->flags & cpu_mask)) continue; if (prcm->xtal_speed != sys_ck.rate) continue; if (prcm->dpll_speed <= clkrate) break; } curr_prcm_set = prcm; #endif recalculate_root_clocks(); printk(KERN_INFO "Clocking rate (Crystal/DPLL/ARM core): " "%ld.%01ld/%ld/%ld MHz\n", (osc_sys_ck.rate / 1000000), (osc_sys_ck.rate / 100000) % 10, (core_ck.rate / 1000000), (arm_fck.rate / 1000000)); /* * Only enable those clocks we will need, let the drivers * enable other clocks as necessary */ clk_enable_init_clocks(); /* Avoid sleeping during omap2_clk_prepare_for_reboot() */ /* REVISIT: not yet ready for 343x */ #if 0 vclk = clk_get(NULL, "virt_prcm_set"); sclk = clk_get(NULL, "sys_ck"); #endif return 0; } #endif