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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
327 lines
6.4 KiB
C
327 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2009 Samsung Electronics
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* Minkyu Kang <mk7.kang@samsung.com>
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* Heungjun Kim <riverful.kim@samsung.com>
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*/
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#include <common.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/clk.h>
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#define CLK_M 0
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#define CLK_D 1
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#define CLK_P 2
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#ifndef CONFIG_SYS_CLK_FREQ_C100
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#define CONFIG_SYS_CLK_FREQ_C100 12000000
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#endif
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#ifndef CONFIG_SYS_CLK_FREQ_C110
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#define CONFIG_SYS_CLK_FREQ_C110 24000000
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#endif
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/* s5pc110: return pll clock frequency */
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static unsigned long s5pc100_get_pll_clk(int pllreg)
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{
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struct s5pc100_clock *clk =
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(struct s5pc100_clock *)samsung_get_base_clock();
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unsigned long r, m, p, s, mask, fout;
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unsigned int freq;
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switch (pllreg) {
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case APLL:
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r = readl(&clk->apll_con);
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break;
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case MPLL:
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r = readl(&clk->mpll_con);
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break;
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case EPLL:
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r = readl(&clk->epll_con);
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break;
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case HPLL:
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r = readl(&clk->hpll_con);
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break;
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default:
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printf("Unsupported PLL (%d)\n", pllreg);
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return 0;
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}
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/*
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* APLL_CON: MIDV [25:16]
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* MPLL_CON: MIDV [23:16]
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* EPLL_CON: MIDV [23:16]
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* HPLL_CON: MIDV [23:16]
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*/
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if (pllreg == APLL)
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mask = 0x3ff;
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else
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mask = 0x0ff;
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m = (r >> 16) & mask;
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/* PDIV [13:8] */
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p = (r >> 8) & 0x3f;
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/* SDIV [2:0] */
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s = r & 0x7;
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/* FOUT = MDIV * FIN / (PDIV * 2^SDIV) */
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freq = CONFIG_SYS_CLK_FREQ_C100;
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fout = m * (freq / (p * (1 << s)));
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return fout;
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}
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/* s5pc100: return pll clock frequency */
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static unsigned long s5pc110_get_pll_clk(int pllreg)
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{
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struct s5pc110_clock *clk =
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(struct s5pc110_clock *)samsung_get_base_clock();
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unsigned long r, m, p, s, mask, fout;
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unsigned int freq;
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switch (pllreg) {
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case APLL:
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r = readl(&clk->apll_con);
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break;
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case MPLL:
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r = readl(&clk->mpll_con);
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break;
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case EPLL:
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r = readl(&clk->epll_con);
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break;
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case VPLL:
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r = readl(&clk->vpll_con);
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break;
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default:
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printf("Unsupported PLL (%d)\n", pllreg);
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return 0;
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}
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/*
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* APLL_CON: MIDV [25:16]
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* MPLL_CON: MIDV [25:16]
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* EPLL_CON: MIDV [24:16]
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* VPLL_CON: MIDV [24:16]
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*/
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if (pllreg == APLL || pllreg == MPLL)
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mask = 0x3ff;
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else
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mask = 0x1ff;
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m = (r >> 16) & mask;
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/* PDIV [13:8] */
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p = (r >> 8) & 0x3f;
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/* SDIV [2:0] */
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s = r & 0x7;
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freq = CONFIG_SYS_CLK_FREQ_C110;
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if (pllreg == APLL) {
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if (s < 1)
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s = 1;
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/* FOUT = MDIV * FIN / (PDIV * 2^(SDIV - 1)) */
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fout = m * (freq / (p * (1 << (s - 1))));
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} else
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/* FOUT = MDIV * FIN / (PDIV * 2^SDIV) */
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fout = m * (freq / (p * (1 << s)));
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return fout;
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}
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/* s5pc110: return ARM clock frequency */
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static unsigned long s5pc110_get_arm_clk(void)
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{
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struct s5pc110_clock *clk =
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(struct s5pc110_clock *)samsung_get_base_clock();
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unsigned long div;
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unsigned long dout_apll, armclk;
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unsigned int apll_ratio;
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div = readl(&clk->div0);
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/* APLL_RATIO: [2:0] */
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apll_ratio = div & 0x7;
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dout_apll = get_pll_clk(APLL) / (apll_ratio + 1);
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armclk = dout_apll;
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return armclk;
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}
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/* s5pc100: return ARM clock frequency */
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static unsigned long s5pc100_get_arm_clk(void)
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{
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struct s5pc100_clock *clk =
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(struct s5pc100_clock *)samsung_get_base_clock();
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unsigned long div;
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unsigned long dout_apll, armclk;
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unsigned int apll_ratio, arm_ratio;
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div = readl(&clk->div0);
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/* ARM_RATIO: [6:4] */
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arm_ratio = (div >> 4) & 0x7;
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/* APLL_RATIO: [0] */
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apll_ratio = div & 0x1;
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dout_apll = get_pll_clk(APLL) / (apll_ratio + 1);
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armclk = dout_apll / (arm_ratio + 1);
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return armclk;
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}
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/* s5pc100: return HCLKD0 frequency */
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static unsigned long get_hclk(void)
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{
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struct s5pc100_clock *clk =
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(struct s5pc100_clock *)samsung_get_base_clock();
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unsigned long hclkd0;
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uint div, d0_bus_ratio;
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div = readl(&clk->div0);
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/* D0_BUS_RATIO: [10:8] */
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d0_bus_ratio = (div >> 8) & 0x7;
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hclkd0 = get_arm_clk() / (d0_bus_ratio + 1);
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return hclkd0;
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}
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/* s5pc100: return PCLKD1 frequency */
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static unsigned long get_pclkd1(void)
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{
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struct s5pc100_clock *clk =
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(struct s5pc100_clock *)samsung_get_base_clock();
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unsigned long d1_bus, pclkd1;
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uint div, d1_bus_ratio, pclkd1_ratio;
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div = readl(&clk->div0);
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/* D1_BUS_RATIO: [14:12] */
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d1_bus_ratio = (div >> 12) & 0x7;
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/* PCLKD1_RATIO: [18:16] */
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pclkd1_ratio = (div >> 16) & 0x7;
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/* ASYNC Mode */
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d1_bus = get_pll_clk(MPLL) / (d1_bus_ratio + 1);
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pclkd1 = d1_bus / (pclkd1_ratio + 1);
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return pclkd1;
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}
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/* s5pc110: return HCLKs frequency */
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static unsigned long get_hclk_sys(int dom)
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{
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struct s5pc110_clock *clk =
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(struct s5pc110_clock *)samsung_get_base_clock();
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unsigned long hclk;
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unsigned int div;
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unsigned int offset;
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unsigned int hclk_sys_ratio;
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if (dom == CLK_M)
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return get_hclk();
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div = readl(&clk->div0);
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/*
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* HCLK_MSYS_RATIO: [10:8]
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* HCLK_DSYS_RATIO: [19:16]
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* HCLK_PSYS_RATIO: [27:24]
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*/
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offset = 8 + (dom << 0x3);
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hclk_sys_ratio = (div >> offset) & 0xf;
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hclk = get_pll_clk(MPLL) / (hclk_sys_ratio + 1);
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return hclk;
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}
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/* s5pc110: return PCLKs frequency */
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static unsigned long get_pclk_sys(int dom)
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{
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struct s5pc110_clock *clk =
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(struct s5pc110_clock *)samsung_get_base_clock();
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unsigned long pclk;
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unsigned int div;
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unsigned int offset;
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unsigned int pclk_sys_ratio;
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div = readl(&clk->div0);
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/*
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* PCLK_MSYS_RATIO: [14:12]
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* PCLK_DSYS_RATIO: [22:20]
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* PCLK_PSYS_RATIO: [30:28]
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*/
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offset = 12 + (dom << 0x3);
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pclk_sys_ratio = (div >> offset) & 0x7;
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pclk = get_hclk_sys(dom) / (pclk_sys_ratio + 1);
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return pclk;
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}
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/* s5pc110: return peripheral clock frequency */
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static unsigned long s5pc110_get_pclk(void)
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{
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return get_pclk_sys(CLK_P);
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}
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/* s5pc100: return peripheral clock frequency */
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static unsigned long s5pc100_get_pclk(void)
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{
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return get_pclkd1();
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}
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/* s5pc1xx: return uart clock frequency */
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static unsigned long s5pc1xx_get_uart_clk(int dev_index)
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{
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if (cpu_is_s5pc110())
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return s5pc110_get_pclk();
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else
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return s5pc100_get_pclk();
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}
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/* s5pc1xx: return pwm clock frequency */
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static unsigned long s5pc1xx_get_pwm_clk(void)
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{
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if (cpu_is_s5pc110())
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return s5pc110_get_pclk();
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else
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return s5pc100_get_pclk();
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}
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unsigned long get_pll_clk(int pllreg)
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{
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if (cpu_is_s5pc110())
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return s5pc110_get_pll_clk(pllreg);
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else
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return s5pc100_get_pll_clk(pllreg);
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}
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unsigned long get_arm_clk(void)
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{
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if (cpu_is_s5pc110())
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return s5pc110_get_arm_clk();
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else
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return s5pc100_get_arm_clk();
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}
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unsigned long get_pwm_clk(void)
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{
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return s5pc1xx_get_pwm_clk();
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}
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unsigned long get_uart_clk(int dev_index)
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{
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return s5pc1xx_get_uart_clk(dev_index);
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}
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void set_mmc_clk(int dev_index, unsigned int div)
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{
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/* Do NOTHING */
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}
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