250 lines
6.6 KiB
C
250 lines
6.6 KiB
C
/*
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* Marvell PXA family clocks
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*
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* Copyright (C) 2014 Robert Jarzmik
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*
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* Common clock code for PXA clocks ("CKEN" type clocks + DT)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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*/
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/of.h>
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#include <dt-bindings/clock/pxa-clock.h>
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#include "clk-pxa.h"
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#define KHz 1000
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#define MHz (1000 * 1000)
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#define MDREFR_K0DB4 (1 << 29) /* SDCLK0 Divide by 4 Control/Status */
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#define MDREFR_K2FREE (1 << 25) /* SDRAM Free-Running Control */
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#define MDREFR_K1FREE (1 << 24) /* SDRAM Free-Running Control */
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#define MDREFR_K0FREE (1 << 23) /* SDRAM Free-Running Control */
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#define MDREFR_SLFRSH (1 << 22) /* SDRAM Self-Refresh Control/Status */
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#define MDREFR_APD (1 << 20) /* SDRAM/SSRAM Auto-Power-Down Enable */
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#define MDREFR_K2DB2 (1 << 19) /* SDCLK2 Divide by 2 Control/Status */
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#define MDREFR_K2RUN (1 << 18) /* SDCLK2 Run Control/Status */
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#define MDREFR_K1DB2 (1 << 17) /* SDCLK1 Divide by 2 Control/Status */
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#define MDREFR_K1RUN (1 << 16) /* SDCLK1 Run Control/Status */
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#define MDREFR_E1PIN (1 << 15) /* SDCKE1 Level Control/Status */
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#define MDREFR_K0DB2 (1 << 14) /* SDCLK0 Divide by 2 Control/Status */
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#define MDREFR_K0RUN (1 << 13) /* SDCLK0 Run Control/Status */
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#define MDREFR_E0PIN (1 << 12) /* SDCKE0 Level Control/Status */
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#define MDREFR_DB2_MASK (MDREFR_K2DB2 | MDREFR_K1DB2)
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#define MDREFR_DRI_MASK 0xFFF
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static DEFINE_SPINLOCK(pxa_clk_lock);
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static struct clk *pxa_clocks[CLK_MAX];
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static struct clk_onecell_data onecell_data = {
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.clks = pxa_clocks,
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.clk_num = CLK_MAX,
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};
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struct pxa_clk {
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struct clk_hw hw;
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struct clk_fixed_factor lp;
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struct clk_fixed_factor hp;
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struct clk_gate gate;
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bool (*is_in_low_power)(void);
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};
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#define to_pxa_clk(_hw) container_of(_hw, struct pxa_clk, hw)
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static unsigned long cken_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct pxa_clk *pclk = to_pxa_clk(hw);
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struct clk_fixed_factor *fix;
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if (!pclk->is_in_low_power || pclk->is_in_low_power())
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fix = &pclk->lp;
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else
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fix = &pclk->hp;
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__clk_hw_set_clk(&fix->hw, hw);
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return clk_fixed_factor_ops.recalc_rate(&fix->hw, parent_rate);
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}
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static struct clk_ops cken_rate_ops = {
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.recalc_rate = cken_recalc_rate,
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};
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static u8 cken_get_parent(struct clk_hw *hw)
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{
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struct pxa_clk *pclk = to_pxa_clk(hw);
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if (!pclk->is_in_low_power)
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return 0;
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return pclk->is_in_low_power() ? 0 : 1;
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}
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static struct clk_ops cken_mux_ops = {
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.get_parent = cken_get_parent,
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.set_parent = dummy_clk_set_parent,
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};
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void __init clkdev_pxa_register(int ckid, const char *con_id,
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const char *dev_id, struct clk *clk)
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{
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if (!IS_ERR(clk) && (ckid != CLK_NONE))
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pxa_clocks[ckid] = clk;
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if (!IS_ERR(clk))
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clk_register_clkdev(clk, con_id, dev_id);
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}
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int __init clk_pxa_cken_init(const struct desc_clk_cken *clks, int nb_clks)
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{
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int i;
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struct pxa_clk *pxa_clk;
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struct clk *clk;
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for (i = 0; i < nb_clks; i++) {
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pxa_clk = kzalloc(sizeof(*pxa_clk), GFP_KERNEL);
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pxa_clk->is_in_low_power = clks[i].is_in_low_power;
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pxa_clk->lp = clks[i].lp;
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pxa_clk->hp = clks[i].hp;
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pxa_clk->gate = clks[i].gate;
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pxa_clk->gate.lock = &pxa_clk_lock;
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clk = clk_register_composite(NULL, clks[i].name,
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clks[i].parent_names, 2,
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&pxa_clk->hw, &cken_mux_ops,
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&pxa_clk->hw, &cken_rate_ops,
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&pxa_clk->gate.hw, &clk_gate_ops,
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clks[i].flags);
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clkdev_pxa_register(clks[i].ckid, clks[i].con_id,
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clks[i].dev_id, clk);
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}
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return 0;
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}
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void __init clk_pxa_dt_common_init(struct device_node *np)
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{
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of_clk_add_provider(np, of_clk_src_onecell_get, &onecell_data);
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}
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void pxa2xx_core_turbo_switch(bool on)
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{
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unsigned long flags;
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unsigned int unused, clkcfg;
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local_irq_save(flags);
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asm("mrc p14, 0, %0, c6, c0, 0" : "=r" (clkcfg));
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clkcfg &= ~CLKCFG_TURBO & ~CLKCFG_HALFTURBO;
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if (on)
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clkcfg |= CLKCFG_TURBO;
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clkcfg |= CLKCFG_FCS;
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asm volatile(
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" b 2f\n"
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" .align 5\n"
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"1: mcr p14, 0, %1, c6, c0, 0\n"
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" b 3f\n"
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"2: b 1b\n"
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"3: nop\n"
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: "=&r" (unused)
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: "r" (clkcfg)
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: );
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local_irq_restore(flags);
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}
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void pxa2xx_cpll_change(struct pxa2xx_freq *freq,
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u32 (*mdrefr_dri)(unsigned int), void __iomem *mdrefr,
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void __iomem *cccr)
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{
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unsigned int clkcfg = freq->clkcfg;
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unsigned int unused, preset_mdrefr, postset_mdrefr;
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unsigned long flags;
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local_irq_save(flags);
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/* Calculate the next MDREFR. If we're slowing down the SDRAM clock
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* we need to preset the smaller DRI before the change. If we're
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* speeding up we need to set the larger DRI value after the change.
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*/
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preset_mdrefr = postset_mdrefr = readl(mdrefr);
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if ((preset_mdrefr & MDREFR_DRI_MASK) > mdrefr_dri(freq->membus_khz)) {
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preset_mdrefr = (preset_mdrefr & ~MDREFR_DRI_MASK);
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preset_mdrefr |= mdrefr_dri(freq->membus_khz);
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}
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postset_mdrefr =
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(postset_mdrefr & ~MDREFR_DRI_MASK) |
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mdrefr_dri(freq->membus_khz);
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/* If we're dividing the memory clock by two for the SDRAM clock, this
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* must be set prior to the change. Clearing the divide must be done
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* after the change.
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*/
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if (freq->div2) {
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preset_mdrefr |= MDREFR_DB2_MASK;
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postset_mdrefr |= MDREFR_DB2_MASK;
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} else {
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postset_mdrefr &= ~MDREFR_DB2_MASK;
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}
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/* Set new the CCCR and prepare CLKCFG */
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writel(freq->cccr, cccr);
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asm volatile(
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" ldr r4, [%1]\n"
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" b 2f\n"
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" .align 5\n"
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"1: str %3, [%1] /* preset the MDREFR */\n"
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" mcr p14, 0, %2, c6, c0, 0 /* set CLKCFG[FCS] */\n"
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" str %4, [%1] /* postset the MDREFR */\n"
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" b 3f\n"
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"2: b 1b\n"
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"3: nop\n"
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: "=&r" (unused)
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: "r" (mdrefr), "r" (clkcfg), "r" (preset_mdrefr),
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"r" (postset_mdrefr)
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: "r4", "r5");
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local_irq_restore(flags);
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}
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int pxa2xx_determine_rate(struct clk_rate_request *req,
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struct pxa2xx_freq *freqs, int nb_freqs)
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{
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int i, closest_below = -1, closest_above = -1;
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unsigned long rate;
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for (i = 0; i < nb_freqs; i++) {
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rate = freqs[i].cpll;
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if (rate == req->rate)
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break;
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if (rate < req->min_rate)
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continue;
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if (rate > req->max_rate)
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continue;
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if (rate <= req->rate)
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closest_below = i;
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if ((rate >= req->rate) && (closest_above == -1))
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closest_above = i;
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}
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req->best_parent_hw = NULL;
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if (i < nb_freqs) {
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rate = req->rate;
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} else if (closest_below >= 0) {
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rate = freqs[closest_below].cpll;
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} else if (closest_above >= 0) {
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rate = freqs[closest_above].cpll;
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} else {
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pr_debug("%s(rate=%lu) no match\n", __func__, req->rate);
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return -EINVAL;
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}
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pr_debug("%s(rate=%lu) rate=%lu\n", __func__, req->rate, rate);
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req->rate = rate;
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return 0;
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}
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