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/fsl/guts.h>
16#include <linux/pci.h>
17#include <linux/of_platform.h>
18#include <asm/div64.h>
19#include <asm/mpic.h>
20#include <asm/swiotlb.h>
21
22#include <sysdev/fsl_soc.h>
23#include <sysdev/fsl_pci.h>
24#include <asm/udbg.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 */
42void 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 */
90enum fsl_diu_monitor_port
91p1022rdk_valid_monitor_port(enum fsl_diu_monitor_port port)
92{
93	return FSL_DIU_PORT_DVI;
94}
95
96#endif
97
98void __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 */
110static 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
129machine_arch_initcall(p1022_rdk, mpc85xx_common_publish_devices);
130
131machine_arch_initcall(p1022_rdk, swiotlb_setup_bus_notifier);
132
133/*
134 * Called very early, device-tree isn't unflattened
135 */
136static 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
143define_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