3 * Utility functions for the Freescale MPC52xx.
5 * Copyright (C) 2006 Sylvain Munaut <tnt@246tNt.com>
7 * This file is licensed under the terms of the GNU General Public License
8 * version 2. This program is licensed "as is" without any warranty of any
9 * kind, whether express or implied.
15 #include <linux/kernel.h>
16 #include <linux/of_platform.h>
19 #include <asm/mpc52xx.h>
23 mpc52xx_find_and_map(const char *compatible)
25 struct device_node *ofn;
27 u64 regaddr64, size64;
29 ofn = of_find_compatible_node(NULL, NULL, compatible);
33 regaddr_p = of_get_address(ofn, 0, &size64, NULL);
39 regaddr64 = of_translate_address(ofn, regaddr_p);
43 return ioremap((u32)regaddr64, (u32)size64);
45 EXPORT_SYMBOL(mpc52xx_find_and_map);
49 * mpc52xx_find_ipb_freq - Find the IPB bus frequency for a device
52 * Returns IPB bus frequency, or 0 if the bus frequency cannot be found.
55 mpc52xx_find_ipb_freq(struct device_node *node)
57 struct device_node *np;
58 const unsigned int *p_ipb_freq = NULL;
62 p_ipb_freq = of_get_property(node, "bus-frequency", NULL);
66 np = of_get_parent(node);
73 return p_ipb_freq ? *p_ipb_freq : 0;
75 EXPORT_SYMBOL(mpc52xx_find_ipb_freq);
79 mpc52xx_setup_cpu(void)
81 struct mpc52xx_cdm __iomem *cdm;
82 struct mpc52xx_xlb __iomem *xlb;
85 cdm = mpc52xx_find_and_map("mpc5200-cdm");
86 xlb = mpc52xx_find_and_map("mpc5200-xlb");
89 printk(KERN_ERR __FILE__ ": "
90 "Error while mapping CDM/XLB during mpc52xx_setup_cpu. "
91 "Expect some abnormal behavior\n");
95 /* Use internal 48 Mhz */
96 out_8(&cdm->ext_48mhz_en, 0x00);
97 out_8(&cdm->fd_enable, 0x01);
98 if (in_be32(&cdm->rstcfg) & 0x40) /* Assumes 33Mhz clock */
99 out_be16(&cdm->fd_counters, 0x0001);
101 out_be16(&cdm->fd_counters, 0x5555);
103 /* Configure the XLB Arbiter priorities */
104 out_be32(&xlb->master_pri_enable, 0xff);
105 out_be32(&xlb->master_priority, 0x11111111);
107 /* Disable XLB pipelining */
108 /* (cfr errate 292. We could do this only just before ATA PIO
109 transaction and re-enable it afterwards ...) */
110 out_be32(&xlb->config, in_be32(&xlb->config) | MPC52xx_XLB_CFG_PLDIS);
114 if (cdm) iounmap(cdm);
115 if (xlb) iounmap(xlb);
119 mpc52xx_declare_of_platform_devices(void)
121 /* Find every child of the SOC node and add it to of_platform */
122 if (of_platform_bus_probe(NULL, NULL, NULL))
123 printk(KERN_ERR __FILE__ ": "
124 "Error while probing of_platform bus\n");