mirror of
https://github.com/brain-hackers/u-boot-brain
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83d290c56f
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>
146 lines
3.6 KiB
C
146 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2010-2011 Freescale Semiconductor, Inc.
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*/
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#include <common.h>
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#include <asm/io.h>
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#include "ics307_clk.h"
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#if defined(CONFIG_FSL_NGPIXIS)
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#include "ngpixis.h"
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#define fpga_reg pixis
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#elif defined(CONFIG_FSL_QIXIS)
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#include "qixis.h"
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#define fpga_reg ((struct qixis *)QIXIS_BASE)
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#else
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#include "pixis.h"
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#define fpga_reg pixis
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#endif
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/* define for SYS CLK or CLK1Frequency */
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#define TTL 1
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#define CLK2 0
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#define CRYSTAL 0
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#define MAX_VDW (511 + 8)
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#define MAX_RDW (127 + 2)
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#define MIN_VDW (4 + 8)
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#define MIN_RDW (1 + 2)
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#define NUM_OD_SETTING 8
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/*
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* These defines cover the industrial temperature range part,
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* for commercial, change below to 400000 and 55000, respectively
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*/
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#define MAX_VCO 360000
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#define MIN_VCO 60000
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/* decode S[0-2] to Output Divider (OD) */
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static u8 ics307_s_to_od[] = {
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10, 2, 8, 4, 5, 7, 3, 6
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};
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/*
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* Find one solution to generate required frequency for SYSCLK
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* out_freq: KHz, required frequency to the SYSCLK
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* the result will be retuned with component RDW, VDW, OD, TTL,
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* CLK2 and crystal
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*/
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unsigned long ics307_sysclk_calculator(unsigned long out_freq)
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{
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const unsigned long input_freq = CONFIG_ICS307_REFCLK_HZ;
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unsigned long vdw, rdw, odp, s_vdw = 0, s_rdw = 0, s_odp = 0, od;
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unsigned long tmp_out, diff, result = 0;
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int found = 0;
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for (odp = 0; odp < NUM_OD_SETTING; odp++) {
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od = ics307_s_to_od[odp];
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if (od * out_freq < MIN_VCO || od * out_freq > MAX_VCO)
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continue;
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for (rdw = MIN_RDW; rdw <= MAX_RDW; rdw++) {
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/* Calculate the VDW */
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vdw = out_freq * 1000 * od * rdw / (input_freq * 2);
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if (vdw > MAX_VDW)
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vdw = MAX_VDW;
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if (vdw < MIN_VDW)
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continue;
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/* Calculate the temp out frequency */
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tmp_out = input_freq * 2 * vdw / (rdw * od * 1000);
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diff = max(out_freq, tmp_out) - min(out_freq, tmp_out);
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/*
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* calculate the percent, the precision is 1/1000
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* If greater than 1/1000, continue
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* otherwise, we think the solution is we required
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*/
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if (diff * 1000 / out_freq > 1)
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continue;
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else {
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s_vdw = vdw;
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s_rdw = rdw;
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s_odp = odp;
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found = 1;
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break;
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}
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}
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}
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if (found)
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result = (s_rdw - 2) | (s_vdw - 8) << 7 | s_odp << 16 |
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CLK2 << 19 | TTL << 21 | CRYSTAL << 22;
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debug("ICS307-02: RDW: %ld, VDW: %ld, OD: %d\n", s_rdw - 2, s_vdw - 8,
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ics307_s_to_od[s_odp]);
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return result;
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}
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/*
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* Calculate frequency being generated by ICS307-02 clock chip based upon
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* the control bytes being programmed into it.
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*/
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static unsigned long ics307_clk_freq(u8 cw0, u8 cw1, u8 cw2)
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{
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const unsigned long input_freq = CONFIG_ICS307_REFCLK_HZ;
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unsigned long vdw = ((cw1 << 1) & 0x1FE) + ((cw2 >> 7) & 1);
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unsigned long rdw = cw2 & 0x7F;
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unsigned long od = ics307_s_to_od[cw0 & 0x7];
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unsigned long freq;
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/*
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* CLK1 Freq = Input Frequency * 2 * (VDW + 8) / ((RDW + 2) * OD)
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*
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* cw0: C1 C0 TTL F1 F0 S2 S1 S0
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* cw1: V8 V7 V6 V5 V4 V3 V2 V1
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* cw2: V0 R6 R5 R4 R3 R2 R1 R0
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*
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* R6:R0 = Reference Divider Word (RDW)
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* V8:V0 = VCO Divider Word (VDW)
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* S2:S0 = Output Divider Select (OD)
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* F1:F0 = Function of CLK2 Output
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* TTL = duty cycle
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* C1:C0 = internal load capacitance for cyrstal
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*
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*/
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freq = input_freq * 2 * (vdw + 8) / ((rdw + 2) * od);
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debug("ICS307: CW[0-2]: %02X %02X %02X => %lu Hz\n", cw0, cw1, cw2,
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freq);
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return freq;
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}
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unsigned long get_board_sys_clk(void)
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{
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return ics307_clk_freq(
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in_8(&fpga_reg->sclk[0]),
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in_8(&fpga_reg->sclk[1]),
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in_8(&fpga_reg->sclk[2]));
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}
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unsigned long get_board_ddr_clk(void)
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{
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return ics307_clk_freq(
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in_8(&fpga_reg->dclk[0]),
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in_8(&fpga_reg->dclk[1]),
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in_8(&fpga_reg->dclk[2]));
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}
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