| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright 2014 Rockchip Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <arch/io.h> |
| #include <assert.h> |
| #include <console/console.h> |
| #include <delay.h> |
| #include <soc/addressmap.h> |
| #include <soc/clock.h> |
| #include <soc/grf.h> |
| #include <soc/soc.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| struct pll_div { |
| u32 nr; |
| u32 nf; |
| u32 no; |
| }; |
| |
| struct rk3288_cru_reg { |
| u32 cru_apll_con[4]; |
| u32 cru_dpll_con[4]; |
| u32 cru_cpll_con[4]; |
| u32 cru_gpll_con[4]; |
| u32 cru_npll_con[4]; |
| u32 cru_mode_con; |
| u32 reserved0[3]; |
| u32 cru_clksel_con[43]; |
| u32 reserved1[21]; |
| u32 cru_clkgate_con[19]; |
| u32 reserved2; |
| u32 cru_glb_srst_fst_value; |
| u32 cru_glb_srst_snd_value; |
| u32 cru_softrst_con[12]; |
| u32 cru_misc_con; |
| u32 cru_glb_cnt_th; |
| u32 cru_glb_rst_con; |
| u32 reserved3; |
| u32 cru_glb_rst_st; |
| u32 reserved4; |
| u32 cru_sdmmc_con[2]; |
| u32 cru_sdio0_con[2]; |
| u32 cru_sdio1_con[2]; |
| u32 cru_emmc_con[2]; |
| }; |
| check_member(rk3288_cru_reg, cru_emmc_con[1], 0x021c); |
| |
| static struct rk3288_cru_reg * const cru_ptr = (void *)CRU_BASE; |
| |
| #define PLL_DIVISORS(hz, _nr, _no) {\ |
| .nr = _nr, .nf = (u32)((u64)hz * _nr * _no / OSC_HZ), .no = _no};\ |
| _Static_assert(((u64)hz * _nr * _no / OSC_HZ) * OSC_HZ /\ |
| (_nr * _no) == hz, #hz "Hz cannot be hit with PLL "\ |
| "divisors on line " STRINGIFY(__LINE__)); |
| |
| /* Keep divisors as low as possible to reduce jitter and power usage. */ |
| static const struct pll_div apll_init_cfg = PLL_DIVISORS(APLL_HZ, 1, 1); |
| static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 2, 2); |
| static const struct pll_div cpll_init_cfg = PLL_DIVISORS(CPLL_HZ, 1, 2); |
| |
| /*******************PLL CON0 BITS***************************/ |
| #define PLL_OD_MSK (0x0F) |
| |
| #define PLL_NR_MSK (0x3F << 8) |
| #define PLL_NR_SHIFT (8) |
| |
| /*******************PLL CON1 BITS***************************/ |
| #define PLL_NF_MSK (0x1FFF) |
| |
| /*******************PLL CON2 BITS***************************/ |
| #define PLL_BWADJ_MSK (0x0FFF) |
| |
| /*******************PLL CON3 BITS***************************/ |
| #define PLL_RESET_MSK (1 << 5) |
| #define PLL_RESET (1 << 5) |
| #define PLL_RESET_RESUME (0 << 5) |
| |
| /*******************CLKSEL0 BITS***************************/ |
| /* core clk pll sel: amr or general */ |
| #define CORE_SEL_PLL_MSK (1 << 15) |
| #define CORE_SEL_APLL (0 << 15) |
| #define CORE_SEL_GPLL (1 << 15) |
| |
| /* a12 core clock div: clk_core = clk_src / (div_con + 1) */ |
| #define A12_DIV_SHIFT (8) |
| #define A12_DIV_MSK (0x1F << 8) |
| |
| /* mp core axi clock div: clk = clk_src / (div_con + 1) */ |
| #define MP_DIV_SHIFT (4) |
| #define MP_DIV_MSK (0xF << 4) |
| |
| /* m0 core axi clock div: clk = clk_src / (div_con + 1) */ |
| #define M0_DIV_MSK (0xF) |
| |
| /*******************CLKSEL1 BITS***************************/ |
| /* pd bus clk pll sel: codec or general */ |
| #define PD_BUS_SEL_PLL_MSK (1 << 15) |
| #define PD_BUS_SEL_CPLL (0 << 15) |
| #define PD_BUS_SEL_GPLL (1 << 15) |
| |
| /* pd bus pclk div: |
| * pclk = pd_bus_aclk /(div + 1) |
| */ |
| #define PD_BUS_PCLK_DIV_SHIFT (12) |
| #define PD_BUS_PCLK_DIV_MSK (0x7 << 12) |
| |
| /* pd bus hclk div: |
| * aclk_bus: hclk_bus = 1:1 or 2:1 or 4:1 |
| */ |
| #define PD_BUS_HCLK_DIV_SHIFT (8) |
| #define PD_BUS_HCLK_DIV_MSK (0x3 << 8) |
| |
| /* pd bus aclk div: |
| * pd_bus_aclk = pd_bus_src_clk /(div0 * div1) |
| */ |
| #define PD_BUS_ACLK_DIV0_SHIFT (3) |
| #define PD_BUS_ACLK_DIV0_MASK (0x1f << 3) |
| #define PD_BUS_ACLK_DIV1_SHIFT (0) |
| #define PD_BUS_ACLK_DIV1_MASK (0x7 << 0) |
| |
| /*******************CLKSEL10 BITS***************************/ |
| /* peripheral bus clk pll sel: codec or general */ |
| #define PERI_SEL_PLL_MSK (1 << 15) |
| #define PERI_SEL_CPLL (0 << 15) |
| #define PERI_SEL_GPLL (1 << 15) |
| |
| /* peripheral bus pclk div: |
| * aclk_bus: pclk_bus = 1:1 or 2:1 or 4:1 or 8:1 |
| */ |
| #define PERI_PCLK_DIV_SHIFT (12) |
| #define PERI_PCLK_DIV_MSK (0x7 << 12) |
| |
| /* peripheral bus hclk div: |
| * aclk_bus: hclk_bus = 1:1 or 2:1 or 4:1 |
| */ |
| #define PERI_HCLK_DIV_SHIFT (8) |
| #define PERI_HCLK_DIV_MSK (0x3 << 8) |
| |
| /* peripheral bus aclk div: |
| * aclk_periph = |
| * periph_clk_src / (peri_aclk_div_con + 1) |
| */ |
| #define PERI_ACLK_DIV_SHIFT (0x0) |
| #define PERI_ACLK_DIV_MSK (0x1F) |
| |
| /*******************CLKSEL37 BITS***************************/ |
| #define L2_DIV_MSK (0x7) |
| |
| #define ATCLK_DIV_MSK (0x1F << 4) |
| #define ATCLK_DIV_SHIFT (4) |
| |
| #define PCLK_DBG_DIV_MSK (0x1F << 9) |
| #define PCLK_DBG_DIV_SHIFT (9) |
| |
| #define APLL_MODE_MSK (0x3) |
| #define APLL_MODE_SLOW (0) |
| #define APLL_MODE_NORM (1) |
| |
| #define DPLL_MODE_MSK (0x3 << 4) |
| #define DPLL_MODE_SLOW (0 << 4) |
| #define DPLL_MODE_NORM (1 << 4) |
| |
| #define CPLL_MODE_MSK (0x3 << 8) |
| #define CPLL_MODE_SLOW (0 << 8) |
| #define CPLL_MODE_NORM (1 << 8) |
| |
| #define GPLL_MODE_MSK (0x3 << 12) |
| #define GPLL_MODE_SLOW (0 << 12) |
| #define GPLL_MODE_NORM (1 << 12) |
| |
| #define NPLL_MODE_MSK (0x3 << 14) |
| #define NPLL_MODE_SLOW (0 << 14) |
| #define NPLL_MODE_NORM (1 << 14) |
| |
| #define SOCSTS_DPLL_LOCK (1 << 5) |
| #define SOCSTS_APLL_LOCK (1 << 6) |
| #define SOCSTS_CPLL_LOCK (1 << 7) |
| #define SOCSTS_GPLL_LOCK (1 << 8) |
| #define SOCSTS_NPLL_LOCK (1 << 9) |
| |
| #define VCO_MAX_KHZ (2200 * (MHz/KHz)) |
| #define VCO_MIN_KHZ (440 * (MHz/KHz)) |
| #define OUTPUT_MAX_KHZ (2200 * (MHz/KHz)) |
| #define OUTPUT_MIN_KHZ 27500 |
| #define FREF_MAX_KHZ (2200 * (MHz/KHz)) |
| #define FREF_MIN_KHZ 269 |
| |
| static int rkclk_set_pll(u32 *pll_con, const struct pll_div *div) |
| { |
| /* All PLLs have same VCO and output frequency range restrictions. */ |
| u32 vco_khz = OSC_HZ/KHz * div->nf / div->nr; |
| u32 output_khz = vco_khz / div->no; |
| |
| printk(BIOS_DEBUG, "Configuring PLL at %p with NF = %d, NR = %d and " |
| "NO = %d (VCO = %uKHz, output = %uKHz)\n", |
| pll_con, div->nf, div->nr, div->no, vco_khz, output_khz); |
| assert(vco_khz >= VCO_MIN_KHZ && vco_khz <= VCO_MAX_KHZ && |
| output_khz >= OUTPUT_MIN_KHZ && output_khz <= OUTPUT_MAX_KHZ && |
| (div->no == 1 || !(div->no % 2))); |
| |
| /* enter rest */ |
| writel(RK_SETBITS(PLL_RESET_MSK), &pll_con[3]); |
| |
| writel(RK_CLRSETBITS(PLL_NR_MSK, (div->nr - 1) << PLL_NR_SHIFT) |
| | RK_CLRSETBITS(PLL_OD_MSK, (div->no - 1)), &pll_con[0]); |
| |
| writel(RK_CLRSETBITS(PLL_NF_MSK, (div->nf - 1)), &pll_con[1]); |
| |
| writel(RK_CLRSETBITS(PLL_BWADJ_MSK, ((div->nf >> 1) - 1)), &pll_con[2]); |
| |
| udelay(10); |
| |
| /* return form rest */ |
| writel(RK_CLRBITS(PLL_RESET_MSK), &pll_con[3]); |
| |
| return 0; |
| } |
| |
| /* |
| TODO: |
| it should be replaced by lib.h function |
| 'unsigned long log2(unsigned long x)' |
| */ |
| static unsigned int log2(unsigned int value) |
| { |
| unsigned int div = 0; |
| |
| while (value != 1) { |
| div++; |
| value = ALIGN_UP(value, 2) / 2; |
| } |
| return div; |
| } |
| |
| void rkclk_init(void) |
| { |
| u32 aclk_div; |
| u32 hclk_div; |
| u32 pclk_div; |
| |
| /* pll enter slow-mode */ |
| writel(RK_CLRSETBITS(GPLL_MODE_MSK, GPLL_MODE_SLOW) |
| | RK_CLRSETBITS(CPLL_MODE_MSK, CPLL_MODE_SLOW), |
| &cru_ptr->cru_mode_con); |
| |
| /* init pll */ |
| rkclk_set_pll(&cru_ptr->cru_gpll_con[0], &gpll_init_cfg); |
| rkclk_set_pll(&cru_ptr->cru_cpll_con[0], &cpll_init_cfg); |
| |
| /* waiting for pll lock */ |
| while (1) { |
| if ((readl(&rk3288_grf->soc_status[1]) |
| & (SOCSTS_CPLL_LOCK | SOCSTS_GPLL_LOCK)) |
| == (SOCSTS_CPLL_LOCK | SOCSTS_GPLL_LOCK)) |
| break; |
| udelay(1); |
| } |
| |
| /* |
| * pd_bus clock pll source selection and |
| * set up dependent divisors for PCLK/HCLK and ACLK clocks. |
| */ |
| aclk_div = GPLL_HZ / PD_BUS_ACLK_HZ - 1; |
| assert((aclk_div + 1) * PD_BUS_ACLK_HZ == GPLL_HZ && aclk_div < 0x1f); |
| hclk_div = PD_BUS_ACLK_HZ / PD_BUS_HCLK_HZ - 1; |
| assert((hclk_div + 1) * PD_BUS_HCLK_HZ == |
| PD_BUS_ACLK_HZ && (hclk_div < 0x4) && (hclk_div != 0x2)); |
| |
| pclk_div = PD_BUS_ACLK_HZ / PD_BUS_PCLK_HZ - 1; |
| assert((pclk_div + 1) * PD_BUS_PCLK_HZ == |
| PD_BUS_ACLK_HZ && pclk_div < 0x7); |
| |
| writel(RK_SETBITS(PD_BUS_SEL_GPLL) |
| | RK_CLRSETBITS(PD_BUS_PCLK_DIV_MSK, |
| pclk_div << PD_BUS_PCLK_DIV_SHIFT) |
| | RK_CLRSETBITS(PD_BUS_HCLK_DIV_MSK, |
| hclk_div << PD_BUS_HCLK_DIV_SHIFT) |
| | RK_CLRSETBITS(PD_BUS_ACLK_DIV0_MASK, |
| aclk_div << PD_BUS_ACLK_DIV0_SHIFT) |
| | RK_CLRSETBITS(PD_BUS_ACLK_DIV1_MASK, 0 << 0), |
| &cru_ptr->cru_clksel_con[1]); |
| |
| /* |
| * peri clock pll source selection and |
| * set up dependent divisors for PCLK/HCLK and ACLK clocks. |
| */ |
| aclk_div = GPLL_HZ / PERI_ACLK_HZ - 1; |
| assert((aclk_div + 1) * PERI_ACLK_HZ == GPLL_HZ && aclk_div < 0x1f); |
| |
| hclk_div = log2(PERI_ACLK_HZ / PERI_HCLK_HZ); |
| assert((1 << hclk_div) * PERI_HCLK_HZ == |
| PERI_ACLK_HZ && (hclk_div < 0x4)); |
| |
| pclk_div = log2(PERI_ACLK_HZ / PERI_PCLK_HZ); |
| assert((1 << pclk_div) * PERI_PCLK_HZ == |
| PERI_ACLK_HZ && (pclk_div < 0x4)); |
| |
| writel(RK_SETBITS(PERI_SEL_GPLL) |
| | RK_CLRSETBITS(PERI_PCLK_DIV_MSK, |
| pclk_div << PERI_PCLK_DIV_SHIFT) |
| | RK_CLRSETBITS(PERI_HCLK_DIV_MSK, |
| hclk_div << PERI_HCLK_DIV_SHIFT) |
| | RK_CLRSETBITS(PERI_ACLK_DIV_MSK, |
| aclk_div << PERI_ACLK_DIV_SHIFT), |
| &cru_ptr->cru_clksel_con[10]); |
| |
| /* PLL enter normal-mode */ |
| writel(RK_CLRSETBITS(GPLL_MODE_MSK, GPLL_MODE_NORM) |
| | RK_CLRSETBITS(CPLL_MODE_MSK, CPLL_MODE_NORM), |
| &cru_ptr->cru_mode_con); |
| |
| } |
| |
| void rkclk_configure_cpu(void) |
| { |
| /* pll enter slow-mode */ |
| writel(RK_CLRSETBITS(APLL_MODE_MSK, APLL_MODE_SLOW), |
| &cru_ptr->cru_mode_con); |
| |
| rkclk_set_pll(&cru_ptr->cru_apll_con[0], &apll_init_cfg); |
| |
| /* waiting for pll lock */ |
| while (1) { |
| if (readl(&rk3288_grf->soc_status[1]) & SOCSTS_APLL_LOCK) |
| break; |
| udelay(1); |
| } |
| |
| /* |
| * core clock pll source selection and |
| * set up dependent divisors for MPAXI/M0AXI and ARM clocks. |
| * core clock select apll, apll clk = 1800MHz |
| * arm clk = 1800MHz, mpclk = 450MHz, m0clk = 900MHz |
| */ |
| writel(RK_CLRBITS(CORE_SEL_PLL_MSK) |
| | RK_CLRSETBITS(A12_DIV_MSK, 0 << A12_DIV_SHIFT) |
| | RK_CLRSETBITS(MP_DIV_MSK, 3 << MP_DIV_SHIFT) |
| | RK_CLRSETBITS(M0_DIV_MSK, 1 << 0), |
| &cru_ptr->cru_clksel_con[0]); |
| |
| /* |
| * set up dependent divisors for L2RAM/ATCLK and PCLK clocks. |
| * l2ramclk = 900MHz, atclk = 450MHz, pclk_dbg = 450MHz |
| */ |
| writel(RK_CLRSETBITS(L2_DIV_MSK, 1 << 0) |
| | RK_CLRSETBITS(ATCLK_DIV_MSK, (3 << ATCLK_DIV_SHIFT)) |
| | RK_CLRSETBITS(PCLK_DBG_DIV_MSK, (3 << PCLK_DBG_DIV_SHIFT)), |
| &cru_ptr->cru_clksel_con[37]); |
| |
| /* PLL enter normal-mode */ |
| writel(RK_CLRSETBITS(APLL_MODE_MSK, APLL_MODE_NORM), |
| &cru_ptr->cru_mode_con); |
| } |
| |
| void rkclk_configure_ddr(unsigned int hz) |
| { |
| struct pll_div dpll_cfg; |
| |
| switch (hz) { |
| case 300*MHz: |
| dpll_cfg = (struct pll_div){.nf = 25, .nr = 2, .no = 1}; |
| break; |
| case 533*MHz: /* actually 533.3P MHz */ |
| dpll_cfg = (struct pll_div){.nf = 400, .nr = 9, .no = 2}; |
| break; |
| case 666*MHz: /* actually 666.6P MHz */ |
| dpll_cfg = (struct pll_div){.nf = 500, .nr = 9, .no = 2}; |
| break; |
| case 800*MHz: |
| dpll_cfg = (struct pll_div){.nf = 100, .nr = 3, .no = 1}; |
| break; |
| default: |
| die("Unsupported SDRAM frequency, add to clock.c!"); |
| } |
| |
| /* pll enter slow-mode */ |
| writel(RK_CLRSETBITS(DPLL_MODE_MSK, DPLL_MODE_SLOW), |
| &cru_ptr->cru_mode_con); |
| |
| rkclk_set_pll(&cru_ptr->cru_dpll_con[0], &dpll_cfg); |
| |
| /* waiting for pll lock */ |
| while (1) { |
| if (readl(&rk3288_grf->soc_status[1]) & SOCSTS_DPLL_LOCK) |
| break; |
| udelay(1); |
| } |
| |
| /* PLL enter normal-mode */ |
| writel(RK_CLRSETBITS(DPLL_MODE_MSK, DPLL_MODE_NORM), |
| &cru_ptr->cru_mode_con); |
| } |
| |
| void rkclk_ddr_reset(u32 ch, u32 ctl, u32 phy) |
| { |
| u32 phy_ctl_srstn_shift = 4 + 5 * ch; |
| u32 ctl_psrstn_shift = 3 + 5 * ch; |
| u32 ctl_srstn_shift = 2 + 5 * ch; |
| u32 phy_psrstn_shift = 1 + 5 * ch; |
| u32 phy_srstn_shift = 5 * ch; |
| |
| writel(RK_CLRSETBITS(1 << phy_ctl_srstn_shift, |
| phy << phy_ctl_srstn_shift) |
| | RK_CLRSETBITS(1 << ctl_psrstn_shift, ctl << ctl_psrstn_shift) |
| | RK_CLRSETBITS(1 << ctl_srstn_shift, ctl << ctl_srstn_shift) |
| | RK_CLRSETBITS(1 << phy_psrstn_shift, phy << phy_psrstn_shift) |
| | RK_CLRSETBITS(1 << phy_srstn_shift, phy << phy_srstn_shift), |
| &cru_ptr->cru_softrst_con[10]); |
| } |
| |
| void rkclk_ddr_phy_ctl_reset(u32 ch, u32 n) |
| { |
| u32 phy_ctl_srstn_shift = 4 + 5 * ch; |
| |
| writel(RK_CLRSETBITS(1 << phy_ctl_srstn_shift, |
| n << phy_ctl_srstn_shift), |
| &cru_ptr->cru_softrst_con[10]); |
| } |
| |
| void rkclk_configure_spi(unsigned int bus, unsigned int hz) |
| { |
| int src_clk_div = GPLL_HZ / hz; |
| |
| assert((src_clk_div - 1 < 127) && (src_clk_div * hz == GPLL_HZ)); |
| |
| switch (bus) { /*select gpll as spi src clk, and set div*/ |
| case 0: |
| writel(RK_CLRSETBITS(1 << 7 | 0x1f << 0, 1 << 7 |
| | (src_clk_div - 1) << 0), |
| &cru_ptr->cru_clksel_con[25]); |
| break; |
| case 1: |
| writel(RK_CLRSETBITS(1 << 15 | 0x1f << 8, 1 << 15 |
| | (src_clk_div - 1) << 8), |
| &cru_ptr->cru_clksel_con[25]); |
| break; |
| case 2: |
| writel(RK_CLRSETBITS(1 << 7 | 0x1f << 0, 1 << 7 |
| | (src_clk_div - 1) << 0), |
| &cru_ptr->cru_clksel_con[39]); |
| break; |
| default: |
| printk(BIOS_ERR, "do not support this spi bus\n"); |
| } |
| } |
| |
| static u32 clk_gcd(u32 a, u32 b) |
| { |
| while (b != 0) { |
| int r = b; |
| b = a % b; |
| a = r; |
| } |
| return a; |
| } |
| |
| void rkclk_configure_i2s(unsigned int hz) |
| { |
| int n, d; |
| int v; |
| |
| /* i2s source clock: gpll |
| i2s0_outclk_sel: clk_i2s |
| i2s0_clk_sel: divider ouput from fraction |
| i2s0_pll_div_con: 0*/ |
| writel(RK_CLRSETBITS(1 << 15 | 1 << 12 | 3 << 8 | 0x7f << 0 , |
| 1 << 15 | 0 << 12 | 1 << 8 | 0 << 0), |
| &cru_ptr->cru_clksel_con[4]); |
| |
| /* set frac divider */ |
| v = clk_gcd(GPLL_HZ, hz); |
| n = (GPLL_HZ / v) & (0xffff); |
| d = (hz / v) & (0xffff); |
| assert(hz == GPLL_HZ / n * d); |
| writel(d << 16 | n, &cru_ptr->cru_clksel_con[8]); |
| } |
| |
| void rkclk_configure_tsadc(unsigned int hz) |
| { |
| u32 div; |
| u32 src_clk = 32 * KHz; /* tsadc source clock is 32KHz*/ |
| |
| div = src_clk / hz; |
| assert((div - 1 < 64) && (div * hz == 32 * KHz)); |
| writel(RK_CLRSETBITS(0x3f << 0, (div - 1) << 0), |
| &cru_ptr->cru_clksel_con[2]); |
| } |
| |
| static int pll_para_config(u32 freq_hz, struct pll_div *div) |
| { |
| u32 ref_khz = OSC_HZ / KHz, nr, nf = 0; |
| u32 fref_khz; |
| u32 diff_khz, best_diff_khz; |
| const u32 max_nr = 1 << 6, max_nf = 1 << 12, max_no = 1 << 4; |
| u32 vco_khz; |
| u32 no = 1; |
| u32 freq_khz = freq_hz / KHz; |
| |
| if (!freq_hz) { |
| printk(BIOS_ERR, "%s: the frequency can not be 0 Hz\n", __func__); |
| return -1; |
| } |
| no = div_round_up(VCO_MIN_KHZ, freq_khz); |
| |
| /* only even divisors (and 1) are supported */ |
| if (no > 1) |
| no = div_round_up(no, 2) * 2; |
| vco_khz = freq_khz * no; |
| if (vco_khz < VCO_MIN_KHZ || vco_khz > VCO_MAX_KHZ || no > max_no) { |
| printk(BIOS_ERR, "%s: Cannot find out a supported VCO" |
| " for Frequency (%uHz).\n", __func__, freq_hz); |
| return -1; |
| } |
| div->no = no; |
| |
| best_diff_khz = vco_khz; |
| for (nr = 1; nr < max_nr && best_diff_khz; nr++) { |
| fref_khz = ref_khz / nr; |
| if (fref_khz < FREF_MIN_KHZ) |
| break; |
| if (fref_khz > FREF_MAX_KHZ) |
| continue; |
| |
| nf = vco_khz / fref_khz; |
| if (nf >= max_nf) |
| continue; |
| diff_khz = vco_khz - nf * fref_khz; |
| if (nf + 1 < max_nf && diff_khz > fref_khz / 2) { |
| nf++; |
| diff_khz = fref_khz - diff_khz; |
| } |
| |
| if (diff_khz >= best_diff_khz) |
| continue; |
| |
| best_diff_khz = diff_khz; |
| div->nr = nr; |
| div->nf = nf; |
| } |
| |
| if (best_diff_khz > 4 * (MHz/KHz)) { |
| printk(BIOS_ERR, "%s: Failed to match output frequency %u, " |
| "difference is %u Hz,exceed 4MHZ\n", __func__, freq_hz, |
| best_diff_khz * KHz); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| void rkclk_configure_edp(void) |
| { |
| /* clk_edp_24M source: 24M */ |
| writel(RK_SETBITS(1 << 15), &cru_ptr->cru_clksel_con[28]); |
| |
| /* rst edp */ |
| writel(RK_SETBITS(1 << 15), &cru_ptr->cru_softrst_con[6]); |
| udelay(1); |
| writel(RK_CLRBITS(1 << 15), &cru_ptr->cru_softrst_con[6]); |
| } |
| |
| void rkclk_configure_vop_aclk(u32 vop_id, u32 aclk_hz) |
| { |
| u32 div; |
| |
| /* vop aclk source clk: cpll */ |
| div = CPLL_HZ / aclk_hz; |
| assert((div - 1 < 64) && (div * aclk_hz == CPLL_HZ)); |
| |
| switch (vop_id) { |
| case 0: |
| writel(RK_CLRSETBITS(3 << 6 | 0x1f << 0, |
| 0 << 6 | (div - 1) << 0), |
| &cru_ptr->cru_clksel_con[31]); |
| break; |
| |
| case 1: |
| writel(RK_CLRSETBITS(3 << 14 | 0x1f << 8, |
| 0 << 14 | (div - 1) << 8), |
| &cru_ptr->cru_clksel_con[31]); |
| break; |
| } |
| } |
| |
| int rkclk_configure_vop_dclk(u32 vop_id, u32 dclk_hz) |
| { |
| struct pll_div npll_config = {0}; |
| |
| if (pll_para_config(dclk_hz, &npll_config)) |
| return -1; |
| |
| /* npll enter slow-mode */ |
| writel(RK_CLRSETBITS(NPLL_MODE_MSK, NPLL_MODE_SLOW), |
| &cru_ptr->cru_mode_con); |
| |
| rkclk_set_pll(&cru_ptr->cru_npll_con[0], &npll_config); |
| |
| /* waiting for pll lock */ |
| while (1) { |
| if (readl(&rk3288_grf->soc_status[1]) & SOCSTS_NPLL_LOCK) |
| break; |
| udelay(1); |
| } |
| |
| /* npll enter normal-mode */ |
| writel(RK_CLRSETBITS(NPLL_MODE_MSK, NPLL_MODE_NORM), |
| &cru_ptr->cru_mode_con); |
| |
| /* vop dclk source clk: npll,dclk_div: 1 */ |
| switch (vop_id) { |
| case 0: |
| writel(RK_CLRSETBITS(0xff << 8 | 3 << 0, |
| 0 << 8 | 2 << 0), |
| &cru_ptr->cru_clksel_con[27]); |
| break; |
| |
| case 1: |
| writel(RK_CLRSETBITS(0xff << 8 | 3 << 6, |
| 0 << 8 | 2 << 6), |
| &cru_ptr->cru_clksel_con[29]); |
| break; |
| } |
| return 0; |
| } |