1 /* 2 * (C) Copyright 2007 3 * Sascha Hauer, Pengutronix 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <div64.h> 10 #include <asm/arch/imx-regs.h> 11 #include <asm/arch/clock.h> 12 #include <asm/io.h> 13 #include <asm/arch/sys_proto.h> 14 15 static u32 mx31_decode_pll(u32 reg, u32 infreq) 16 { 17 u32 mfi = GET_PLL_MFI(reg); 18 s32 mfn = GET_PLL_MFN(reg); 19 u32 mfd = GET_PLL_MFD(reg); 20 u32 pd = GET_PLL_PD(reg); 21 22 mfi = mfi <= 5 ? 5 : mfi; 23 mfn = mfn >= 512 ? mfn - 1024 : mfn; 24 mfd += 1; 25 pd += 1; 26 27 return lldiv(2 * (u64)infreq * (mfi * mfd + mfn), 28 mfd * pd); 29 } 30 31 static u32 mx31_get_mpl_dpdgck_clk(void) 32 { 33 u32 infreq; 34 35 if ((readl(CCM_CCMR) & CCMR_PRCS_MASK) == CCMR_FPM) 36 infreq = MXC_CLK32 * 1024; 37 else 38 infreq = MXC_HCLK; 39 40 return mx31_decode_pll(readl(CCM_MPCTL), infreq); 41 } 42 43 static u32 mx31_get_mcu_main_clk(void) 44 { 45 /* For now we assume mpl_dpdgck_clk == mcu_main_clk 46 * which should be correct for most boards 47 */ 48 return mx31_get_mpl_dpdgck_clk(); 49 } 50 51 static u32 mx31_get_ipg_clk(void) 52 { 53 u32 freq = mx31_get_mcu_main_clk(); 54 u32 pdr0 = readl(CCM_PDR0); 55 56 freq /= GET_PDR0_MAX_PODF(pdr0) + 1; 57 freq /= GET_PDR0_IPG_PODF(pdr0) + 1; 58 59 return freq; 60 } 61 62 /* hsp is the clock for the ipu */ 63 static u32 mx31_get_hsp_clk(void) 64 { 65 u32 freq = mx31_get_mcu_main_clk(); 66 u32 pdr0 = readl(CCM_PDR0); 67 68 freq /= GET_PDR0_HSP_PODF(pdr0) + 1; 69 70 return freq; 71 } 72 73 void mx31_dump_clocks(void) 74 { 75 u32 cpufreq = mx31_get_mcu_main_clk(); 76 printf("mx31 cpu clock: %dMHz\n", cpufreq / 1000000); 77 printf("ipg clock : %dHz\n", mx31_get_ipg_clk()); 78 printf("hsp clock : %dHz\n", mx31_get_hsp_clk()); 79 } 80 81 unsigned int mxc_get_clock(enum mxc_clock clk) 82 { 83 switch (clk) { 84 case MXC_ARM_CLK: 85 return mx31_get_mcu_main_clk(); 86 case MXC_IPG_CLK: 87 case MXC_IPG_PERCLK: 88 case MXC_CSPI_CLK: 89 case MXC_UART_CLK: 90 case MXC_ESDHC_CLK: 91 case MXC_I2C_CLK: 92 return mx31_get_ipg_clk(); 93 case MXC_IPU_CLK: 94 return mx31_get_hsp_clk(); 95 } 96 return -1; 97 } 98 99 u32 imx_get_uartclk(void) 100 { 101 return mxc_get_clock(MXC_UART_CLK); 102 } 103 104 void mx31_gpio_mux(unsigned long mode) 105 { 106 unsigned long reg, shift, tmp; 107 108 reg = IOMUXC_BASE + (mode & 0x1fc); 109 shift = (~mode & 0x3) * 8; 110 111 tmp = readl(reg); 112 tmp &= ~(0xff << shift); 113 tmp |= ((mode >> IOMUX_MODE_POS) & 0xff) << shift; 114 writel(tmp, reg); 115 } 116 117 void mx31_set_pad(enum iomux_pins pin, u32 config) 118 { 119 u32 field, l, reg; 120 121 pin &= IOMUX_PADNUM_MASK; 122 reg = (IOMUXC_BASE + 0x154) + (pin + 2) / 3 * 4; 123 field = (pin + 2) % 3; 124 125 l = readl(reg); 126 l &= ~(0x1ff << (field * 10)); 127 l |= config << (field * 10); 128 writel(l, reg); 129 130 } 131 132 void mx31_set_gpr(enum iomux_gp_func gp, char en) 133 { 134 u32 l; 135 struct iomuxc_regs *iomuxc = (struct iomuxc_regs *)IOMUXC_BASE; 136 137 l = readl(&iomuxc->gpr); 138 if (en) 139 l |= gp; 140 else 141 l &= ~gp; 142 143 writel(l, &iomuxc->gpr); 144 } 145 146 void mxc_setup_weimcs(int cs, const struct mxc_weimcs *weimcs) 147 { 148 struct mx31_weim *weim = (struct mx31_weim *) WEIM_BASE; 149 struct mx31_weim_cscr *cscr = &weim->cscr[cs]; 150 151 writel(weimcs->upper, &cscr->upper); 152 writel(weimcs->lower, &cscr->lower); 153 writel(weimcs->additional, &cscr->additional); 154 } 155 156 struct mx3_cpu_type mx31_cpu_type[] = { 157 { .srev = 0x00, .v = 0x10 }, 158 { .srev = 0x10, .v = 0x11 }, 159 { .srev = 0x11, .v = 0x11 }, 160 { .srev = 0x12, .v = 0x1F }, 161 { .srev = 0x13, .v = 0x1F }, 162 { .srev = 0x14, .v = 0x12 }, 163 { .srev = 0x15, .v = 0x12 }, 164 { .srev = 0x28, .v = 0x20 }, 165 { .srev = 0x29, .v = 0x20 }, 166 }; 167 168 u32 get_cpu_rev(void) 169 { 170 u32 i, srev; 171 172 /* read SREV register from IIM module */ 173 struct iim_regs *iim = (struct iim_regs *)MX31_IIM_BASE_ADDR; 174 srev = readl(&iim->iim_srev); 175 176 for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++) 177 if (srev == mx31_cpu_type[i].srev) 178 return mx31_cpu_type[i].v | (MXC_CPU_MX31 << 12); 179 180 return srev | 0x8000; 181 } 182 183 static char *get_reset_cause(void) 184 { 185 /* read RCSR register from CCM module */ 186 struct clock_control_regs *ccm = 187 (struct clock_control_regs *)CCM_BASE; 188 189 u32 cause = readl(&ccm->rcsr) & 0x07; 190 191 switch (cause) { 192 case 0x0000: 193 return "POR"; 194 case 0x0001: 195 return "RST"; 196 case 0x0002: 197 return "WDOG"; 198 case 0x0006: 199 return "JTAG"; 200 case 0x0007: 201 return "ARM11P power gating"; 202 default: 203 return "unknown reset"; 204 } 205 } 206 207 #if defined(CONFIG_DISPLAY_CPUINFO) 208 int print_cpuinfo(void) 209 { 210 u32 srev = get_cpu_rev(); 211 212 printf("CPU: Freescale i.MX31 rev %d.%d%s at %d MHz.\n", 213 (srev & 0xF0) >> 4, (srev & 0x0F), 214 ((srev & 0x8000) ? " unknown" : ""), 215 mx31_get_mcu_main_clk() / 1000000); 216 printf("Reset cause: %s\n", get_reset_cause()); 217 return 0; 218 } 219 #endif 220