1 /* 2 * P1022 RDK board specific routines 3 * 4 * Copyright 2012 Freescale Semiconductor, Inc. 5 * 6 * Author: Timur Tabi <timur@freescale.com> 7 * 8 * Based on p1022_ds.c 9 * 10 * This file is licensed under the terms of the GNU General Public License 11 * version 2. This program is licensed "as is" without any warranty of any 12 * kind, whether express or implied. 13 */ 14 15 #include <linux/pci.h> 16 #include <linux/of_platform.h> 17 #include <asm/div64.h> 18 #include <asm/mpic.h> 19 #include <asm/swiotlb.h> 20 21 #include <sysdev/fsl_soc.h> 22 #include <sysdev/fsl_pci.h> 23 #include <asm/udbg.h> 24 #include <asm/fsl_guts.h> 25 #include "smp.h" 26 27 #include "mpc85xx.h" 28 29 #if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE) 30 31 /* DIU Pixel Clock bits of the CLKDVDR Global Utilities register */ 32 #define CLKDVDR_PXCKEN 0x80000000 33 #define CLKDVDR_PXCKINV 0x10000000 34 #define CLKDVDR_PXCKDLY 0x06000000 35 #define CLKDVDR_PXCLK_MASK 0x00FF0000 36 37 /** 38 * p1022rdk_set_pixel_clock: program the DIU's clock 39 * 40 * @pixclock: the wavelength, in picoseconds, of the clock 41 */ 42 void p1022rdk_set_pixel_clock(unsigned int pixclock) 43 { 44 struct device_node *guts_np = NULL; 45 struct ccsr_guts __iomem *guts; 46 unsigned long freq; 47 u64 temp; 48 u32 pxclk; 49 50 /* Map the global utilities registers. */ 51 guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts"); 52 if (!guts_np) { 53 pr_err("p1022rdk: missing global utilities device node\n"); 54 return; 55 } 56 57 guts = of_iomap(guts_np, 0); 58 of_node_put(guts_np); 59 if (!guts) { 60 pr_err("p1022rdk: could not map global utilities device\n"); 61 return; 62 } 63 64 /* Convert pixclock from a wavelength to a frequency */ 65 temp = 1000000000000ULL; 66 do_div(temp, pixclock); 67 freq = temp; 68 69 /* 70 * 'pxclk' is the ratio of the platform clock to the pixel clock. 71 * This number is programmed into the CLKDVDR register, and the valid 72 * range of values is 2-255. 73 */ 74 pxclk = DIV_ROUND_CLOSEST(fsl_get_sys_freq(), freq); 75 pxclk = clamp_t(u32, pxclk, 2, 255); 76 77 /* Disable the pixel clock, and set it to non-inverted and no delay */ 78 clrbits32(&guts->clkdvdr, 79 CLKDVDR_PXCKEN | CLKDVDR_PXCKDLY | CLKDVDR_PXCLK_MASK); 80 81 /* Enable the clock and set the pxclk */ 82 setbits32(&guts->clkdvdr, CLKDVDR_PXCKEN | (pxclk << 16)); 83 84 iounmap(guts); 85 } 86 87 /** 88 * p1022rdk_valid_monitor_port: set the monitor port for sysfs 89 */ 90 enum fsl_diu_monitor_port 91 p1022rdk_valid_monitor_port(enum fsl_diu_monitor_port port) 92 { 93 return FSL_DIU_PORT_DVI; 94 } 95 96 #endif 97 98 void __init p1022_rdk_pic_init(void) 99 { 100 struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN | 101 MPIC_SINGLE_DEST_CPU, 102 0, 256, " OpenPIC "); 103 BUG_ON(mpic == NULL); 104 mpic_init(mpic); 105 } 106 107 /* 108 * Setup the architecture 109 */ 110 static void __init p1022_rdk_setup_arch(void) 111 { 112 if (ppc_md.progress) 113 ppc_md.progress("p1022_rdk_setup_arch()", 0); 114 115 #if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE) 116 diu_ops.set_pixel_clock = p1022rdk_set_pixel_clock; 117 diu_ops.valid_monitor_port = p1022rdk_valid_monitor_port; 118 #endif 119 120 mpc85xx_smp_init(); 121 122 fsl_pci_assign_primary(); 123 124 swiotlb_detect_4g(); 125 126 pr_info("Freescale / iVeia P1022 RDK reference board\n"); 127 } 128 129 machine_arch_initcall(p1022_rdk, mpc85xx_common_publish_devices); 130 131 machine_arch_initcall(p1022_rdk, swiotlb_setup_bus_notifier); 132 133 /* 134 * Called very early, device-tree isn't unflattened 135 */ 136 static int __init p1022_rdk_probe(void) 137 { 138 unsigned long root = of_get_flat_dt_root(); 139 140 return of_flat_dt_is_compatible(root, "fsl,p1022rdk"); 141 } 142 143 define_machine(p1022_rdk) { 144 .name = "P1022 RDK", 145 .probe = p1022_rdk_probe, 146 .setup_arch = p1022_rdk_setup_arch, 147 .init_IRQ = p1022_rdk_pic_init, 148 #ifdef CONFIG_PCI 149 .pcibios_fixup_bus = fsl_pcibios_fixup_bus, 150 .pcibios_fixup_phb = fsl_pcibios_fixup_phb, 151 #endif 152 .get_irq = mpic_get_irq, 153 .restart = fsl_rstcr_restart, 154 .calibrate_decr = generic_calibrate_decr, 155 .progress = udbg_progress, 156 }; 157