/arch/powerpc/sysdev/fsl_soc.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * FSL SoC setup code
  4 *
  5 * Maintained by Kumar Gala (see MAINTAINERS for contact information)
  6 *
  7 * 2006 (c) MontaVista Software, Inc.
  8 * Vitaly Bordug <vbordug@ru.mvista.com>
  9 */
 10
 11#include <linux/stddef.h>
 12#include <linux/kernel.h>
 13#include <linux/init.h>
 14#include <linux/errno.h>
 15#include <linux/major.h>
 16#include <linux/delay.h>
 17#include <linux/irq.h>
 18#include <linux/export.h>
 19#include <linux/device.h>
 20#include <linux/platform_device.h>
 21#include <linux/of.h>
 22#include <linux/of_platform.h>
 23#include <linux/phy.h>
 24#include <linux/spi/spi.h>
 25#include <linux/fsl_devices.h>
 26#include <linux/fs_enet_pd.h>
 27#include <linux/fs_uart_pd.h>
 28#include <linux/reboot.h>
 29
 30#include <linux/atomic.h>
 31#include <asm/io.h>
 32#include <asm/irq.h>
 33#include <asm/time.h>
 34#include <asm/prom.h>
 35#include <asm/machdep.h>
 36#include <sysdev/fsl_soc.h>
 37#include <mm/mmu_decl.h>
 38#include <asm/cpm2.h>
 39#include <asm/fsl_hcalls.h>	/* For the Freescale hypervisor */
 40
 41extern void init_fcc_ioports(struct fs_platform_info*);
 42extern void init_fec_ioports(struct fs_platform_info*);
 43extern void init_smc_ioports(struct fs_uart_platform_info*);
 44static phys_addr_t immrbase = -1;
 45
 46phys_addr_t get_immrbase(void)
 47{
 48	struct device_node *soc;
 49
 50	if (immrbase != -1)
 51		return immrbase;
 52
 53	soc = of_find_node_by_type(NULL, "soc");
 54	if (soc) {
 55		int size;
 56		u32 naddr;
 57		const __be32 *prop = of_get_property(soc, "#address-cells", &size);
 58
 59		if (prop && size == 4)
 60			naddr = be32_to_cpup(prop);
 61		else
 62			naddr = 2;
 63
 64		prop = of_get_property(soc, "ranges", &size);
 65		if (prop)
 66			immrbase = of_translate_address(soc, prop + naddr);
 67
 68		of_node_put(soc);
 69	}
 70
 71	return immrbase;
 72}
 73
 74EXPORT_SYMBOL(get_immrbase);
 75
 76u32 fsl_get_sys_freq(void)
 77{
 78	static u32 sysfreq = -1;
 79	struct device_node *soc;
 80
 81	if (sysfreq != -1)
 82		return sysfreq;
 83
 84	soc = of_find_node_by_type(NULL, "soc");
 85	if (!soc)
 86		return -1;
 87
 88	of_property_read_u32(soc, "clock-frequency", &sysfreq);
 89	if (sysfreq == -1 || !sysfreq)
 90		of_property_read_u32(soc, "bus-frequency", &sysfreq);
 91
 92	of_node_put(soc);
 93	return sysfreq;
 94}
 95EXPORT_SYMBOL(fsl_get_sys_freq);
 96
 97#if defined(CONFIG_CPM) || defined(CONFIG_QUICC_ENGINE)
 98
 99u32 get_brgfreq(void)
100{
101	static u32 brgfreq = -1;
102	struct device_node *node;
103
104	if (brgfreq != -1)
105		return brgfreq;
106
107	node = of_find_compatible_node(NULL, NULL, "fsl,cpm-brg");
108	if (node) {
109		of_property_read_u32(node, "clock-frequency", &brgfreq);
110		of_node_put(node);
111		return brgfreq;
112	}
113
114	/* Legacy device binding -- will go away when no users are left. */
115	node = of_find_node_by_type(NULL, "cpm");
116	if (!node)
117		node = of_find_compatible_node(NULL, NULL, "fsl,qe");
118	if (!node)
119		node = of_find_node_by_type(NULL, "qe");
120
121	if (node) {
122		of_property_read_u32(node, "brg-frequency", &brgfreq);
123		if (brgfreq == -1 || !brgfreq)
124			if (!of_property_read_u32(node, "bus-frequency",
125						  &brgfreq))
126				brgfreq /= 2;
127		of_node_put(node);
128	}
129
130	return brgfreq;
131}
132
133EXPORT_SYMBOL(get_brgfreq);
134
135u32 get_baudrate(void)
136{
137	static u32 fs_baudrate = -1;
138	struct device_node *node;
139
140	if (fs_baudrate != -1)
141		return fs_baudrate;
142
143	node = of_find_node_by_type(NULL, "serial");
144	if (node) {
145		of_property_read_u32(node, "current-speed", &fs_baudrate);
146		of_node_put(node);
147	}
148
149	return fs_baudrate;
150}
151
152EXPORT_SYMBOL(get_baudrate);
153#endif /* CONFIG_CPM2 */
154
155#if defined(CONFIG_FSL_SOC_BOOKE) || defined(CONFIG_PPC_86xx)
156static __be32 __iomem *rstcr;
157
158static int fsl_rstcr_restart(struct notifier_block *this,
159			     unsigned long mode, void *cmd)
160{
161	local_irq_disable();
162	/* set reset control register */
163	out_be32(rstcr, 0x2);	/* HRESET_REQ */
164
165	return NOTIFY_DONE;
166}
167
168static int __init setup_rstcr(void)
169{
170	struct device_node *np;
171
172	static struct notifier_block restart_handler = {
173		.notifier_call = fsl_rstcr_restart,
174		.priority = 128,
175	};
176
177	for_each_node_by_name(np, "global-utilities") {
178		if ((of_get_property(np, "fsl,has-rstcr", NULL))) {
179			rstcr = of_iomap(np, 0) + 0xb0;
180			if (!rstcr) {
181				printk (KERN_ERR "Error: reset control "
182						"register not mapped!\n");
183			} else {
184				register_restart_handler(&restart_handler);
185			}
186			break;
187		}
188	}
189
190	of_node_put(np);
191
192	return 0;
193}
194
195arch_initcall(setup_rstcr);
196
197#endif
198
199#if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)
200struct platform_diu_data_ops diu_ops;
201EXPORT_SYMBOL(diu_ops);
202#endif
203
204#ifdef CONFIG_EPAPR_PARAVIRT
205/*
206 * Restart the current partition
207 *
208 * This function should be assigned to the ppc_md.restart function pointer,
209 * to initiate a partition restart when we're running under the Freescale
210 * hypervisor.
211 */
212void __noreturn fsl_hv_restart(char *cmd)
213{
214	pr_info("hv restart\n");
215	fh_partition_restart(-1);
216	while (1) ;
217}
218
219/*
220 * Halt the current partition
221 *
222 * This function should be assigned to the pm_power_off and ppc_md.halt
223 * function pointers, to shut down the partition when we're running under
224 * the Freescale hypervisor.
225 */
226void __noreturn fsl_hv_halt(void)
227{
228	pr_info("hv exit\n");
229	fh_partition_stop(-1);
230	while (1) ;
231}
232#endif