1 /* $NetBSD: imx23_platform.c,v 1.1 2025/10/09 06:15:16 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2025 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Yuri Honegger. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Platform code for the NXP i.MX23 SOC. 34 * 35 * This code is partially based on imx23_olinuxino_machdep.c 36 */ 37 38 #include <sys/types.h> 39 40 #include <uvm/uvm_extern.h> 41 42 #include <dev/fdt/fdt_platform.h> 43 #include <dev/fdt/fdtvar.h> 44 45 #include <arch/evbarm/fdt/platform.h> 46 #include <arm/cpufunc.h> 47 #include <arm/fdt/arm_fdtvar.h> 48 #include <arm/imx/imx23_clkctrlreg.h> 49 #include <arm/imx/imx23_digctlreg.h> 50 #include <arm/imx/imx23var.h> 51 #include <evbarm/dev/plcomreg.h> 52 53 #include "opt_console.h" 54 55 #define REG_RD(reg) *(volatile uint32_t *)(reg) 56 #define REG_WR(reg, val) \ 57 do { \ 58 *(volatile uint32_t *)((reg)) = val; \ 59 } while (0) 60 61 void imx23_platform_early_putchar(char); 62 63 static const struct pmap_devmap *imx23_platform_devmap(void); 64 65 void 66 imx23_platform_early_putchar(char c) 67 { 68 #ifdef CONSADDR 69 #define CONSADDR_VA ((CONSADDR - APBH_BASE) + KERNEL_IO_VBASE) 70 volatile uint32_t *uartaddr = cpu_earlydevice_va_p() 71 ? (volatile uint32_t *)CONSADDR_VA 72 : (volatile uint32_t *)CONSADDR; 73 74 while ((le32toh(uartaddr[PL01XCOM_FR / 4]) & PL01X_FR_TXFF) != 0) 75 continue; 76 77 uartaddr[PL01XCOM_DR / 4] = htole32(c); 78 dsb(sy); 79 80 while ((le32toh(uartaddr[PL01XCOM_FR / 4]) & PL01X_FR_TXFE) == 0) 81 continue; 82 #endif 83 } 84 85 static const struct pmap_devmap * 86 imx23_platform_devmap(void) { 87 static const struct pmap_devmap devmap[] = { 88 DEVMAP_ENTRY( 89 APBH_BASE, /* Virtual address. */ 90 APBH_BASE, /* Physical address. */ 91 APBH_SIZE + APBX_SIZE /* APBX located after APBH. */ 92 ), 93 DEVMAP_ENTRY_END 94 }; 95 96 return devmap; 97 } 98 99 static void 100 imx23_platform_init_attach_args(struct fdt_attach_args *faa) 101 { 102 faa->faa_bst = &imx23_bus_space; 103 faa->faa_dmat = &imx23_bus_dma_tag; 104 } 105 106 static void 107 imx23_platform_device_register(device_t self, void *aux) 108 { 109 } 110 111 static void 112 imx23_platform_reset(void) 113 { 114 // reboot 115 REG_WR(HW_CLKCTRL_BASE + HW_CLKCTRL_RESET, HW_CLKCTRL_RESET_CHIP); 116 } 117 118 /* 119 * Delay us microseconds. 120 */ 121 static void 122 imx23_platform_delay(unsigned int us) 123 { 124 uint32_t start; 125 uint32_t now; 126 uint32_t elapsed; 127 uint32_t total; 128 uint32_t last; 129 130 total = 0; 131 last = 0; 132 start = REG_RD(HW_DIGCTL_BASE + HW_DIGCTL_MICROSECONDS); 133 134 do { 135 now = REG_RD(HW_DIGCTL_BASE + HW_DIGCTL_MICROSECONDS); 136 137 if (start <= now) 138 elapsed = now - start; 139 else /* Take care of overflow. */ 140 elapsed = (UINT32_MAX - start) + 1 + now; 141 142 total += elapsed - last; 143 last = elapsed; 144 145 } while (total < us); 146 147 return; 148 } 149 150 static u_int 151 imx23_platform_uart_freq(void) 152 { 153 /* The documentation mentions the uart is driven by a 24MHz clock. */ 154 return 24000000; 155 } 156 157 static const struct fdt_platform imx23_platform = { 158 .fp_devmap = imx23_platform_devmap, 159 .fp_bootstrap = arm_fdt_cpu_bootstrap, 160 .fp_init_attach_args = imx23_platform_init_attach_args, 161 .fp_device_register = imx23_platform_device_register, 162 .fp_reset = imx23_platform_reset, 163 .fp_delay = imx23_platform_delay, 164 .fp_uart_freq = imx23_platform_uart_freq, 165 }; 166 167 FDT_PLATFORM(imx23, "fsl,imx23", &imx23_platform); 168