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https://github.com/brain-hackers/u-boot-brain
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![Stephen Warren](/assets/img/avatar_default.png)
The following changes are made to the clock API: * The concept of "clocks" and "peripheral clocks" are unified; each clock provider now implements a single set of clocks. This provides a simpler conceptual interface to clients, and better aligns with device tree clock bindings. * Clocks are now identified with a single "struct clk", rather than requiring clients to store the clock provider device and clock identity values separately. For simple clock consumers, this isolates clients from internal details of the clock API. * clk.h is split so it only contains the client/consumer API, whereas clk-uclass.h contains the provider API. This aligns with the recently added reset and mailbox APIs. * clk_ops .of_xlate(), .request(), and .free() are added so providers can customize these operations if needed. This also aligns with the recently added reset and mailbox APIs. * clk_disable() is added. * All users of the current clock APIs are updated. * Sandbox clock tests are updated to exercise clock lookup via DT, and clock enable/disable. * rkclk_get_clk() is removed and replaced with standard APIs. Buildman shows no clock-related errors for any board for which buildman can download a toolchain. test/py passes for sandbox (which invokes the dm clk test amongst others). Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Simon Glass <sjg@chromium.org>
387 lines
10 KiB
C
387 lines
10 KiB
C
/*
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* (C) Copyright 2015 Google, Inc
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <common.h>
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#include <clk-uclass.h>
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#include <dm.h>
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#include <errno.h>
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#include <syscon.h>
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#include <asm/io.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/cru_rk3036.h>
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#include <asm/arch/hardware.h>
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#include <dm/lists.h>
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#include <dt-bindings/clock/rk3036-cru.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct rk3036_clk_priv {
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struct rk3036_cru *cru;
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ulong rate;
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};
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enum {
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VCO_MAX_HZ = 2400U * 1000000,
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VCO_MIN_HZ = 600 * 1000000,
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OUTPUT_MAX_HZ = 2400U * 1000000,
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OUTPUT_MIN_HZ = 24 * 1000000,
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};
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#define RATE_TO_DIV(input_rate, output_rate) \
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((input_rate) / (output_rate) - 1);
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#define DIV_TO_RATE(input_rate, div) ((input_rate) / ((div) + 1))
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#define PLL_DIVISORS(hz, _refdiv, _postdiv1, _postdiv2) {\
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.refdiv = _refdiv,\
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.fbdiv = (u32)((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ),\
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.postdiv1 = _postdiv1, .postdiv2 = _postdiv2};\
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_Static_assert(((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ) *\
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OSC_HZ / (_refdiv * _postdiv1 * _postdiv2) == hz,\
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#hz "Hz cannot be hit with PLL "\
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"divisors on line " __stringify(__LINE__));
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/* use interge mode*/
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static const struct pll_div apll_init_cfg = PLL_DIVISORS(APLL_HZ, 1, 3, 1);
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static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 2, 2, 1);
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static inline unsigned int log2(unsigned int value)
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{
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return fls(value) - 1;
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}
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void *rockchip_get_cru(void)
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{
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struct udevice *dev;
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fdt_addr_t addr;
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int ret;
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ret = uclass_get_device(UCLASS_CLK, 0, &dev);
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if (ret)
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return ERR_PTR(ret);
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addr = dev_get_addr(dev);
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if (addr == FDT_ADDR_T_NONE)
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return ERR_PTR(-EINVAL);
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return (void *)addr;
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}
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static int rkclk_set_pll(struct rk3036_cru *cru, enum rk_clk_id clk_id,
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const struct pll_div *div)
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{
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int pll_id = rk_pll_id(clk_id);
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struct rk3036_pll *pll = &cru->pll[pll_id];
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/* All PLLs have same VCO and output frequency range restrictions. */
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uint vco_hz = OSC_HZ / 1000 * div->fbdiv / div->refdiv * 1000;
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uint output_hz = vco_hz / div->postdiv1 / div->postdiv2;
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debug("PLL at %p: fbdiv=%d, refdiv=%d, postdiv1=%d, postdiv2=%d,\
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vco=%u Hz, output=%u Hz\n",
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pll, div->fbdiv, div->refdiv, div->postdiv1,
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div->postdiv2, vco_hz, output_hz);
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assert(vco_hz >= VCO_MIN_HZ && vco_hz <= VCO_MAX_HZ &&
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output_hz >= OUTPUT_MIN_HZ && output_hz <= OUTPUT_MAX_HZ);
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/* use interger mode */
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rk_clrreg(&pll->con1, 1 << PLL_DSMPD_SHIFT);
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rk_clrsetreg(&pll->con0,
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PLL_POSTDIV1_MASK << PLL_POSTDIV1_SHIFT | PLL_FBDIV_MASK,
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(div->postdiv1 << PLL_POSTDIV1_SHIFT) | div->fbdiv);
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rk_clrsetreg(&pll->con1, PLL_POSTDIV2_MASK << PLL_POSTDIV2_SHIFT |
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PLL_REFDIV_MASK << PLL_REFDIV_SHIFT,
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(div->postdiv2 << PLL_POSTDIV2_SHIFT |
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div->refdiv << PLL_REFDIV_SHIFT));
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/* waiting for pll lock */
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while (readl(&pll->con1) & (1 << PLL_LOCK_STATUS_SHIFT))
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udelay(1);
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return 0;
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}
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static void rkclk_init(struct rk3036_cru *cru)
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{
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u32 aclk_div;
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u32 hclk_div;
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u32 pclk_div;
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/* pll enter slow-mode */
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rk_clrsetreg(&cru->cru_mode_con,
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GPLL_MODE_MASK << GPLL_MODE_SHIFT |
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APLL_MODE_MASK << APLL_MODE_SHIFT,
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GPLL_MODE_SLOW << GPLL_MODE_SHIFT |
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APLL_MODE_SLOW << APLL_MODE_SHIFT);
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/* init pll */
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rkclk_set_pll(cru, CLK_ARM, &apll_init_cfg);
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rkclk_set_pll(cru, CLK_GENERAL, &gpll_init_cfg);
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/*
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* select apll as core clock pll source and
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* set up dependent divisors for PCLK/HCLK and ACLK clocks.
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* core hz : apll = 1:1
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*/
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aclk_div = APLL_HZ / CORE_ACLK_HZ - 1;
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assert((aclk_div + 1) * CORE_ACLK_HZ == APLL_HZ && aclk_div < 0x7);
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pclk_div = APLL_HZ / CORE_PERI_HZ - 1;
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assert((pclk_div + 1) * CORE_PERI_HZ == APLL_HZ && pclk_div < 0xf);
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rk_clrsetreg(&cru->cru_clksel_con[0],
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CORE_CLK_PLL_SEL_MASK << CORE_CLK_PLL_SEL_SHIFT |
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CORE_DIV_CON_MASK << CORE_DIV_CON_SHIFT,
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CORE_CLK_PLL_SEL_APLL << CORE_CLK_PLL_SEL_SHIFT |
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0 << CORE_DIV_CON_SHIFT);
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rk_clrsetreg(&cru->cru_clksel_con[1],
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CORE_ACLK_DIV_MASK << CORE_ACLK_DIV_SHIFT |
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CORE_PERI_DIV_MASK << CORE_PERI_DIV_SHIFT,
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aclk_div << CORE_ACLK_DIV_SHIFT |
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pclk_div << CORE_PERI_DIV_SHIFT);
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/*
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* select apll as cpu clock pll source and
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* set up dependent divisors for PCLK/HCLK and ACLK clocks.
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*/
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aclk_div = APLL_HZ / CPU_ACLK_HZ - 1;
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assert((aclk_div + 1) * CPU_ACLK_HZ == APLL_HZ && aclk_div < 0x1f);
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pclk_div = APLL_HZ / CPU_PCLK_HZ - 1;
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assert((pclk_div + 1) * CPU_PCLK_HZ == APLL_HZ && pclk_div < 0x7);
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hclk_div = APLL_HZ / CPU_HCLK_HZ - 1;
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assert((hclk_div + 1) * CPU_HCLK_HZ == APLL_HZ && hclk_div < 0x3);
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rk_clrsetreg(&cru->cru_clksel_con[0],
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CPU_CLK_PLL_SEL_MASK << CPU_CLK_PLL_SEL_SHIFT |
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ACLK_CPU_DIV_MASK << ACLK_CPU_DIV_SHIFT,
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CPU_CLK_PLL_SEL_APLL << CPU_CLK_PLL_SEL_SHIFT |
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aclk_div << ACLK_CPU_DIV_SHIFT);
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rk_clrsetreg(&cru->cru_clksel_con[1],
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CPU_PCLK_DIV_MASK << CPU_PCLK_DIV_SHIFT |
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CPU_HCLK_DIV_MASK << CPU_HCLK_DIV_SHIFT,
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pclk_div << CPU_PCLK_DIV_SHIFT |
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hclk_div << CPU_HCLK_DIV_SHIFT);
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/*
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* select gpll as peri clock pll source and
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* set up dependent divisors for PCLK/HCLK and ACLK clocks.
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*/
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aclk_div = GPLL_HZ / PERI_ACLK_HZ - 1;
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assert((aclk_div + 1) * PERI_ACLK_HZ == GPLL_HZ && aclk_div < 0x1f);
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hclk_div = log2(PERI_ACLK_HZ / PERI_HCLK_HZ);
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assert((1 << hclk_div) * PERI_HCLK_HZ ==
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PERI_ACLK_HZ && (pclk_div < 0x4));
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pclk_div = log2(PERI_ACLK_HZ / PERI_PCLK_HZ);
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assert((1 << pclk_div) * PERI_PCLK_HZ ==
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PERI_ACLK_HZ && pclk_div < 0x8);
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rk_clrsetreg(&cru->cru_clksel_con[10],
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PERI_PLL_SEL_MASK << PERI_PLL_SEL_SHIFT |
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PERI_PCLK_DIV_MASK << PERI_PCLK_DIV_SHIFT |
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PERI_HCLK_DIV_MASK << PERI_HCLK_DIV_SHIFT |
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PERI_ACLK_DIV_MASK << PERI_ACLK_DIV_SHIFT,
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PERI_PLL_GPLL << PERI_PLL_SEL_SHIFT |
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pclk_div << PERI_PCLK_DIV_SHIFT |
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hclk_div << PERI_HCLK_DIV_SHIFT |
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aclk_div << PERI_ACLK_DIV_SHIFT);
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/* PLL enter normal-mode */
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rk_clrsetreg(&cru->cru_mode_con,
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GPLL_MODE_MASK << GPLL_MODE_SHIFT |
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APLL_MODE_MASK << APLL_MODE_SHIFT,
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GPLL_MODE_NORM << GPLL_MODE_SHIFT |
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APLL_MODE_NORM << APLL_MODE_SHIFT);
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}
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/* Get pll rate by id */
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static uint32_t rkclk_pll_get_rate(struct rk3036_cru *cru,
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enum rk_clk_id clk_id)
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{
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uint32_t refdiv, fbdiv, postdiv1, postdiv2;
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uint32_t con;
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int pll_id = rk_pll_id(clk_id);
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struct rk3036_pll *pll = &cru->pll[pll_id];
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static u8 clk_shift[CLK_COUNT] = {
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0xff, APLL_MODE_SHIFT, DPLL_MODE_SHIFT, 0xff,
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GPLL_MODE_SHIFT, 0xff
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};
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static u8 clk_mask[CLK_COUNT] = {
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0xff, APLL_MODE_MASK, DPLL_MODE_MASK, 0xff,
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GPLL_MODE_MASK, 0xff
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};
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uint shift;
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uint mask;
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con = readl(&cru->cru_mode_con);
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shift = clk_shift[clk_id];
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mask = clk_mask[clk_id];
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switch ((con >> shift) & mask) {
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case GPLL_MODE_SLOW:
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return OSC_HZ;
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case GPLL_MODE_NORM:
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/* normal mode */
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con = readl(&pll->con0);
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postdiv1 = (con >> PLL_POSTDIV1_SHIFT) & PLL_POSTDIV1_MASK;
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fbdiv = (con >> PLL_FBDIV_SHIFT) & PLL_FBDIV_MASK;
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con = readl(&pll->con1);
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postdiv2 = (con >> PLL_POSTDIV2_SHIFT) & PLL_POSTDIV2_MASK;
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refdiv = (con >> PLL_REFDIV_SHIFT) & PLL_REFDIV_MASK;
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return (24 * fbdiv / (refdiv * postdiv1 * postdiv2)) * 1000000;
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case GPLL_MODE_DEEP:
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default:
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return 32768;
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}
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}
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static ulong rockchip_mmc_get_clk(struct rk3036_cru *cru, uint clk_general_rate,
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int periph)
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{
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uint src_rate;
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uint div, mux;
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u32 con;
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switch (periph) {
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case HCLK_EMMC:
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con = readl(&cru->cru_clksel_con[12]);
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mux = (con >> EMMC_PLL_SHIFT) & EMMC_PLL_MASK;
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div = (con >> EMMC_DIV_SHIFT) & EMMC_DIV_MASK;
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break;
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case HCLK_SDIO:
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con = readl(&cru->cru_clksel_con[12]);
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mux = (con >> MMC0_PLL_SHIFT) & MMC0_PLL_MASK;
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div = (con >> MMC0_DIV_SHIFT) & MMC0_DIV_MASK;
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break;
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default:
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return -EINVAL;
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}
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src_rate = mux == EMMC_SEL_24M ? OSC_HZ : clk_general_rate;
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return DIV_TO_RATE(src_rate, div);
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}
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static ulong rockchip_mmc_set_clk(struct rk3036_cru *cru, uint clk_general_rate,
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int periph, uint freq)
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{
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int src_clk_div;
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int mux;
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debug("%s: clk_general_rate=%u\n", __func__, clk_general_rate);
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/* mmc clock auto divide 2 in internal */
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src_clk_div = (clk_general_rate / 2 + freq - 1) / freq;
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if (src_clk_div > 0x7f) {
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src_clk_div = (OSC_HZ / 2 + freq - 1) / freq;
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mux = EMMC_SEL_24M;
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} else {
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mux = EMMC_SEL_GPLL;
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}
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switch (periph) {
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case HCLK_EMMC:
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rk_clrsetreg(&cru->cru_clksel_con[12],
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EMMC_PLL_MASK << EMMC_PLL_SHIFT |
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EMMC_DIV_MASK << EMMC_DIV_SHIFT,
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mux << EMMC_PLL_SHIFT |
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(src_clk_div - 1) << EMMC_DIV_SHIFT);
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break;
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case HCLK_SDIO:
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rk_clrsetreg(&cru->cru_clksel_con[11],
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MMC0_PLL_MASK << MMC0_PLL_SHIFT |
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MMC0_DIV_MASK << MMC0_DIV_SHIFT,
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mux << MMC0_PLL_SHIFT |
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(src_clk_div - 1) << MMC0_DIV_SHIFT);
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break;
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default:
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return -EINVAL;
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}
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return rockchip_mmc_get_clk(cru, clk_general_rate, periph);
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}
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static ulong rk3036_clk_get_rate(struct clk *clk)
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{
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struct rk3036_clk_priv *priv = dev_get_priv(clk->dev);
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switch (clk->id) {
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case 0 ... 63:
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return rkclk_pll_get_rate(priv->cru, clk->id);
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default:
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return -ENOENT;
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}
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}
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static ulong rk3036_clk_set_rate(struct clk *clk, ulong rate)
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{
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struct rk3036_clk_priv *priv = dev_get_priv(clk->dev);
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ulong new_rate, gclk_rate;
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gclk_rate = rkclk_pll_get_rate(priv->cru, CLK_GENERAL);
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switch (clk->id) {
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case 0 ... 63:
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return 0;
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case HCLK_EMMC:
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new_rate = rockchip_mmc_set_clk(priv->cru, gclk_rate,
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clk->id, rate);
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break;
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default:
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return -ENOENT;
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}
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return new_rate;
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}
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static struct clk_ops rk3036_clk_ops = {
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.get_rate = rk3036_clk_get_rate,
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.set_rate = rk3036_clk_set_rate,
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};
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static int rk3036_clk_probe(struct udevice *dev)
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{
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struct rk3036_clk_priv *priv = dev_get_priv(dev);
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priv->cru = (struct rk3036_cru *)dev_get_addr(dev);
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rkclk_init(priv->cru);
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return 0;
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}
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static int rk3036_clk_bind(struct udevice *dev)
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{
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int ret;
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/* The reset driver does not have a device node, so bind it here */
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ret = device_bind_driver(gd->dm_root, "rk3036_sysreset", "reset", &dev);
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if (ret)
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debug("Warning: No RK3036 reset driver: ret=%d\n", ret);
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return 0;
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}
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static const struct udevice_id rk3036_clk_ids[] = {
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{ .compatible = "rockchip,rk3036-cru" },
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{ }
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};
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U_BOOT_DRIVER(clk_rk3036) = {
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.name = "clk_rk3036",
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.id = UCLASS_CLK,
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.of_match = rk3036_clk_ids,
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.priv_auto_alloc_size = sizeof(struct rk3036_clk_priv),
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.ops = &rk3036_clk_ops,
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.bind = rk3036_clk_bind,
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.probe = rk3036_clk_probe,
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};
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