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[POWERPC] Add common routines for 52xx support in arch/powerpc
Adds utility routines used by 52xx device drivers and board support code. Main functionality is to add device nodes to the of_platform_bus, retrieve the IPB bus frequency, and find+ioremap device registers. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Sylvain Munaut <tnt@246tNt.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
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Grant Likely
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Paul Mackerras
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Dec 4, 2006
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| /* | ||
| * | ||
| * Utility functions for the Freescale MPC52xx. | ||
| * | ||
| * Copyright (C) 2006 Sylvain Munaut <tnt@246tNt.com> | ||
| * | ||
| * This file is licensed under the terms of the GNU General Public License | ||
| * version 2. This program is licensed "as is" without any warranty of any | ||
| * kind, whether express or implied. | ||
| * | ||
| */ | ||
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| #undef DEBUG | ||
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| #include <linux/kernel.h> | ||
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| #include <asm/io.h> | ||
| #include <asm/prom.h> | ||
| #include <asm/of_platform.h> | ||
| #include <asm/mpc52xx.h> | ||
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| void __iomem * | ||
| mpc52xx_find_and_map(const char *compatible) | ||
| { | ||
| struct device_node *ofn; | ||
| const u32 *regaddr_p; | ||
| u64 regaddr64, size64; | ||
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| ofn = of_find_compatible_node(NULL, NULL, compatible); | ||
| if (!ofn) | ||
| return NULL; | ||
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| regaddr_p = of_get_address(ofn, 0, &size64, NULL); | ||
| if (!regaddr_p) { | ||
| of_node_put(ofn); | ||
| return NULL; | ||
| } | ||
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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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| /** | ||
| * mpc52xx_find_ipb_freq - Find the IPB bus frequency for a device | ||
| * @node: device node | ||
| * | ||
| * Returns IPB bus frequency, or 0 if the bus frequency cannot be found. | ||
| */ | ||
| unsigned int | ||
| mpc52xx_find_ipb_freq(struct device_node *node) | ||
| { | ||
| struct device_node *np; | ||
| const unsigned int *p_ipb_freq = NULL; | ||
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| of_node_get(node); | ||
| while (node) { | ||
| p_ipb_freq = get_property(node, "bus-frequency", NULL); | ||
| if (p_ipb_freq) | ||
| break; | ||
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| np = of_get_parent(node); | ||
| of_node_put(node); | ||
| node = np; | ||
| } | ||
| if (node) | ||
| of_node_put(node); | ||
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| return p_ipb_freq ? *p_ipb_freq : 0; | ||
| } | ||
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| void __init | ||
| mpc52xx_setup_cpu(void) | ||
| { | ||
| struct mpc52xx_cdm __iomem *cdm; | ||
| struct mpc52xx_xlb __iomem *xlb; | ||
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| /* Map zones */ | ||
| cdm = mpc52xx_find_and_map("mpc52xx-cdm"); | ||
| xlb = mpc52xx_find_and_map("mpc52xx-xlb"); | ||
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| if (!cdm || !xlb) { | ||
| printk(KERN_ERR __FILE__ ": " | ||
| "Error while mapping CDM/XLB during mpc52xx_setup_cpu. " | ||
| "Expect some abnormal behavior\n"); | ||
| goto unmap_regs; | ||
| } | ||
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| /* Use internal 48 Mhz */ | ||
| out_8(&cdm->ext_48mhz_en, 0x00); | ||
| out_8(&cdm->fd_enable, 0x01); | ||
| if (in_be32(&cdm->rstcfg) & 0x40) /* Assumes 33Mhz clock */ | ||
| out_be16(&cdm->fd_counters, 0x0001); | ||
| else | ||
| out_be16(&cdm->fd_counters, 0x5555); | ||
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| /* Configure the XLB Arbiter priorities */ | ||
| out_be32(&xlb->master_pri_enable, 0xff); | ||
| out_be32(&xlb->master_priority, 0x11111111); | ||
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| /* Disable XLB pipelining */ | ||
| /* (cfr errate 292. We could do this only just before ATA PIO | ||
| transaction and re-enable it afterwards ...) */ | ||
| out_be32(&xlb->config, in_be32(&xlb->config) | MPC52xx_XLB_CFG_PLDIS); | ||
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| /* Unmap zones */ | ||
| unmap_regs: | ||
| if (cdm) iounmap(cdm); | ||
| if (xlb) iounmap(xlb); | ||
| } | ||
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| static int __init | ||
| mpc52xx_declare_of_platform_devices(void) | ||
| { | ||
| /* Find every child of the SOC node and add it to of_platform */ | ||
| return of_platform_bus_probe(NULL, NULL, NULL); | ||
| } | ||
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| device_initcall(mpc52xx_declare_of_platform_devices); |
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