128 lines
2.8 KiB
C
128 lines
2.8 KiB
C
/*
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*
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* Utility functions for the Freescale MPC52xx.
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*
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* Copyright (C) 2006 Sylvain Munaut <tnt@246tNt.com>
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*
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*/
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#undef DEBUG
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#include <linux/kernel.h>
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#include <asm/io.h>
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#include <asm/prom.h>
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#include <asm/of_platform.h>
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#include <asm/mpc52xx.h>
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void __iomem *
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mpc52xx_find_and_map(const char *compatible)
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{
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struct device_node *ofn;
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const u32 *regaddr_p;
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u64 regaddr64, size64;
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ofn = of_find_compatible_node(NULL, NULL, compatible);
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if (!ofn)
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return NULL;
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regaddr_p = of_get_address(ofn, 0, &size64, NULL);
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if (!regaddr_p) {
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of_node_put(ofn);
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return NULL;
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}
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regaddr64 = of_translate_address(ofn, regaddr_p);
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of_node_put(ofn);
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return ioremap((u32)regaddr64, (u32)size64);
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}
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EXPORT_SYMBOL(mpc52xx_find_and_map);
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/**
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* mpc52xx_find_ipb_freq - Find the IPB bus frequency for a device
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* @node: device node
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*
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* Returns IPB bus frequency, or 0 if the bus frequency cannot be found.
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*/
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unsigned int
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mpc52xx_find_ipb_freq(struct device_node *node)
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{
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struct device_node *np;
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const unsigned int *p_ipb_freq = NULL;
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of_node_get(node);
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while (node) {
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p_ipb_freq = get_property(node, "bus-frequency", NULL);
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if (p_ipb_freq)
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break;
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np = of_get_parent(node);
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of_node_put(node);
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node = np;
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}
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if (node)
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of_node_put(node);
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return p_ipb_freq ? *p_ipb_freq : 0;
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}
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EXPORT_SYMBOL(mpc52xx_find_ipb_freq);
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void __init
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mpc52xx_setup_cpu(void)
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{
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struct mpc52xx_cdm __iomem *cdm;
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struct mpc52xx_xlb __iomem *xlb;
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/* Map zones */
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cdm = mpc52xx_find_and_map("mpc52xx-cdm");
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xlb = mpc52xx_find_and_map("mpc52xx-xlb");
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if (!cdm || !xlb) {
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printk(KERN_ERR __FILE__ ": "
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"Error while mapping CDM/XLB during mpc52xx_setup_cpu. "
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"Expect some abnormal behavior\n");
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goto unmap_regs;
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}
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/* Use internal 48 Mhz */
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out_8(&cdm->ext_48mhz_en, 0x00);
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out_8(&cdm->fd_enable, 0x01);
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if (in_be32(&cdm->rstcfg) & 0x40) /* Assumes 33Mhz clock */
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out_be16(&cdm->fd_counters, 0x0001);
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else
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out_be16(&cdm->fd_counters, 0x5555);
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/* Configure the XLB Arbiter priorities */
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out_be32(&xlb->master_pri_enable, 0xff);
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out_be32(&xlb->master_priority, 0x11111111);
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/* Disable XLB pipelining */
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/* (cfr errate 292. We could do this only just before ATA PIO
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transaction and re-enable it afterwards ...) */
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out_be32(&xlb->config, in_be32(&xlb->config) | MPC52xx_XLB_CFG_PLDIS);
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/* Unmap zones */
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unmap_regs:
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if (cdm) iounmap(cdm);
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if (xlb) iounmap(xlb);
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}
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void __init
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mpc52xx_declare_of_platform_devices(void)
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{
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/* Find every child of the SOC node and add it to of_platform */
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if (of_platform_bus_probe(NULL, NULL, NULL))
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printk(KERN_ERR __FILE__ ": "
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"Error while probing of_platform bus\n");
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}
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