diff options
Diffstat (limited to 'qemu/roms/u-boot/board/freescale/common/ics307_clk.c')
| -rw-r--r-- | qemu/roms/u-boot/board/freescale/common/ics307_clk.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/board/freescale/common/ics307_clk.c b/qemu/roms/u-boot/board/freescale/common/ics307_clk.c new file mode 100644 index 000000000..6789efb9c --- /dev/null +++ b/qemu/roms/u-boot/board/freescale/common/ics307_clk.c @@ -0,0 +1,146 @@ +/* + * Copyright 2010-2011 Freescale Semiconductor, Inc. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/io.h> + +#include "ics307_clk.h" + +#if defined(CONFIG_FSL_NGPIXIS) +#include "ngpixis.h" +#define fpga_reg pixis +#elif defined(CONFIG_FSL_QIXIS) +#include "qixis.h" +#define fpga_reg ((struct qixis *)QIXIS_BASE) +#else +#include "pixis.h" +#define fpga_reg pixis +#endif + +/* define for SYS CLK or CLK1Frequency */ +#define TTL 1 +#define CLK2 0 +#define CRYSTAL 0 +#define MAX_VDW (511 + 8) +#define MAX_RDW (127 + 2) +#define MIN_VDW (4 + 8) +#define MIN_RDW (1 + 2) +#define NUM_OD_SETTING 8 +/* + * These defines cover the industrial temperature range part, + * for commercial, change below to 400000 and 55000, respectively + */ +#define MAX_VCO 360000 +#define MIN_VCO 60000 + +/* decode S[0-2] to Output Divider (OD) */ +static u8 ics307_s_to_od[] = { + 10, 2, 8, 4, 5, 7, 3, 6 +}; + +/* + * Find one solution to generate required frequency for SYSCLK + * out_freq: KHz, required frequency to the SYSCLK + * the result will be retuned with component RDW, VDW, OD, TTL, + * CLK2 and crystal + */ +unsigned long ics307_sysclk_calculator(unsigned long out_freq) +{ + const unsigned long input_freq = CONFIG_ICS307_REFCLK_HZ; + unsigned long vdw, rdw, odp, s_vdw = 0, s_rdw = 0, s_odp = 0, od; + unsigned long tmp_out, diff, result = 0; + int found = 0; + + for (odp = 0; odp < NUM_OD_SETTING; odp++) { + od = ics307_s_to_od[odp]; + if (od * out_freq < MIN_VCO || od * out_freq > MAX_VCO) + continue; + for (rdw = MIN_RDW; rdw <= MAX_RDW; rdw++) { + /* Calculate the VDW */ + vdw = out_freq * 1000 * od * rdw / (input_freq * 2); + if (vdw > MAX_VDW) + vdw = MAX_VDW; + if (vdw < MIN_VDW) + continue; + /* Calculate the temp out frequency */ + tmp_out = input_freq * 2 * vdw / (rdw * od * 1000); + diff = MAX(out_freq, tmp_out) - MIN(out_freq, tmp_out); + /* + * calculate the percent, the precision is 1/1000 + * If greater than 1/1000, continue + * otherwise, we think the solution is we required + */ + if (diff * 1000 / out_freq > 1) + continue; + else { + s_vdw = vdw; + s_rdw = rdw; + s_odp = odp; + found = 1; + break; + } + } + } + + if (found) + result = (s_rdw - 2) | (s_vdw - 8) << 7 | s_odp << 16 | + CLK2 << 19 | TTL << 21 | CRYSTAL << 22; + + debug("ICS307-02: RDW: %ld, VDW: %ld, OD: %d\n", s_rdw - 2, s_vdw - 8, + ics307_s_to_od[s_odp]); + return result; +} + +/* + * Calculate frequency being generated by ICS307-02 clock chip based upon + * the control bytes being programmed into it. + */ +static unsigned long ics307_clk_freq(u8 cw0, u8 cw1, u8 cw2) +{ + const unsigned long input_freq = CONFIG_ICS307_REFCLK_HZ; + unsigned long vdw = ((cw1 << 1) & 0x1FE) + ((cw2 >> 7) & 1); + unsigned long rdw = cw2 & 0x7F; + unsigned long od = ics307_s_to_od[cw0 & 0x7]; + unsigned long freq; + + /* + * CLK1 Freq = Input Frequency * 2 * (VDW + 8) / ((RDW + 2) * OD) + * + * cw0: C1 C0 TTL F1 F0 S2 S1 S0 + * cw1: V8 V7 V6 V5 V4 V3 V2 V1 + * cw2: V0 R6 R5 R4 R3 R2 R1 R0 + * + * R6:R0 = Reference Divider Word (RDW) + * V8:V0 = VCO Divider Word (VDW) + * S2:S0 = Output Divider Select (OD) + * F1:F0 = Function of CLK2 Output + * TTL = duty cycle + * C1:C0 = internal load capacitance for cyrstal + * + */ + + freq = input_freq * 2 * (vdw + 8) / ((rdw + 2) * od); + + debug("ICS307: CW[0-2]: %02X %02X %02X => %lu Hz\n", cw0, cw1, cw2, + freq); + return freq; +} + +unsigned long get_board_sys_clk(void) +{ + return ics307_clk_freq( + in_8(&fpga_reg->sclk[0]), + in_8(&fpga_reg->sclk[1]), + in_8(&fpga_reg->sclk[2])); +} + +unsigned long get_board_ddr_clk(void) +{ + return ics307_clk_freq( + in_8(&fpga_reg->dclk[0]), + in_8(&fpga_reg->dclk[1]), + in_8(&fpga_reg->dclk[2])); +} |