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0195c00244
-----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIVAwUAT3NKzROxKuMESys7AQKElw/+JyDxJSlj+g+nymkx8IVVuU8CsEwNLgRk 8KEnRfLhGtkXFLSJYWO6jzGo16F8Uqli1PdMFte/wagSv0285/HZaKlkkBVHdJ/m u40oSjgT013bBh6MQ0Oaf8pFezFUiQB5zPOA9QGaLVGDLXCmgqUgd7exaD5wRIwB ZmyItjZeAVnDfk1R+ZiNYytHAi8A5wSB+eFDCIQYgyulA1Igd1UnRtx+dRKbvc/m rWQ6KWbZHIdvP1ksd8wHHkrlUD2pEeJ8glJLsZUhMm/5oMf/8RmOCvmo8rvE/qwl eDQ1h4cGYlfjobxXZMHqAN9m7Jg2bI946HZjdb7/7oCeO6VW3FwPZ/Ic75p+wp45 HXJTItufERYk6QxShiOKvA+QexnYwY0IT5oRP4DrhdVB/X9cl2MoaZHC+RbYLQy+ /5VNZKi38iK4F9AbFamS7kd0i5QszA/ZzEzKZ6VMuOp3W/fagpn4ZJT1LIA3m4A9 Q0cj24mqeyCfjysu0TMbPtaN+Yjeu1o1OFRvM8XffbZsp5bNzuTDEvviJ2NXw4vK 4qUHulhYSEWcu9YgAZXvEWDEM78FXCkg2v/CrZXH5tyc95kUkMPcgG+QZBB5wElR FaOKpiC/BuNIGEf02IZQ4nfDxE90QwnDeoYeV+FvNj9UEOopJ5z5bMPoTHxm4cCD NypQthI85pc= =G9mT -----END PGP SIGNATURE----- Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system Pull "Disintegrate and delete asm/system.h" from David Howells: "Here are a bunch of patches to disintegrate asm/system.h into a set of separate bits to relieve the problem of circular inclusion dependencies. I've built all the working defconfigs from all the arches that I can and made sure that they don't break. The reason for these patches is that I recently encountered a circular dependency problem that came about when I produced some patches to optimise get_order() by rewriting it to use ilog2(). This uses bitops - and on the SH arch asm/bitops.h drags in asm-generic/get_order.h by a circuituous route involving asm/system.h. The main difficulty seems to be asm/system.h. It holds a number of low level bits with no/few dependencies that are commonly used (eg. memory barriers) and a number of bits with more dependencies that aren't used in many places (eg. switch_to()). These patches break asm/system.h up into the following core pieces: (1) asm/barrier.h Move memory barriers here. This already done for MIPS and Alpha. (2) asm/switch_to.h Move switch_to() and related stuff here. (3) asm/exec.h Move arch_align_stack() here. Other process execution related bits could perhaps go here from asm/processor.h. (4) asm/cmpxchg.h Move xchg() and cmpxchg() here as they're full word atomic ops and frequently used by atomic_xchg() and atomic_cmpxchg(). (5) asm/bug.h Move die() and related bits. (6) asm/auxvec.h Move AT_VECTOR_SIZE_ARCH here. Other arch headers are created as needed on a per-arch basis." Fixed up some conflicts from other header file cleanups and moving code around that has happened in the meantime, so David's testing is somewhat weakened by that. We'll find out anything that got broken and fix it.. * tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system: (38 commits) Delete all instances of asm/system.h Remove all #inclusions of asm/system.h Add #includes needed to permit the removal of asm/system.h Move all declarations of free_initmem() to linux/mm.h Disintegrate asm/system.h for OpenRISC Split arch_align_stack() out from asm-generic/system.h Split the switch_to() wrapper out of asm-generic/system.h Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h Create asm-generic/barrier.h Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h Disintegrate asm/system.h for Xtensa Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt] Disintegrate asm/system.h for Tile Disintegrate asm/system.h for Sparc Disintegrate asm/system.h for SH Disintegrate asm/system.h for Score Disintegrate asm/system.h for S390 Disintegrate asm/system.h for PowerPC Disintegrate asm/system.h for PA-RISC Disintegrate asm/system.h for MN10300 ...
320 lines
7.1 KiB
C
320 lines
7.1 KiB
C
/*
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* linux/drivers/mfd/mcp-sa11x0.c
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*
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* Copyright (C) 2001-2005 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License.
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*
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* SA11x0 MCP (Multimedia Communications Port) driver.
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*
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* MCP read/write timeouts from Jordi Colomer, rehacked by rmk.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/mfd/mcp.h>
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#include <mach/hardware.h>
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#include <asm/mach-types.h>
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#include <mach/mcp.h>
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#define DRIVER_NAME "sa11x0-mcp"
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struct mcp_sa11x0 {
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void __iomem *base0;
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void __iomem *base1;
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u32 mccr0;
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u32 mccr1;
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};
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/* Register offsets */
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#define MCCR0(m) ((m)->base0 + 0x00)
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#define MCDR0(m) ((m)->base0 + 0x08)
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#define MCDR1(m) ((m)->base0 + 0x0c)
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#define MCDR2(m) ((m)->base0 + 0x10)
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#define MCSR(m) ((m)->base0 + 0x18)
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#define MCCR1(m) ((m)->base1 + 0x00)
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#define priv(mcp) ((struct mcp_sa11x0 *)mcp_priv(mcp))
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static void
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mcp_sa11x0_set_telecom_divisor(struct mcp *mcp, unsigned int divisor)
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{
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struct mcp_sa11x0 *m = priv(mcp);
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divisor /= 32;
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m->mccr0 &= ~0x00007f00;
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m->mccr0 |= divisor << 8;
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writel_relaxed(m->mccr0, MCCR0(m));
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}
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static void
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mcp_sa11x0_set_audio_divisor(struct mcp *mcp, unsigned int divisor)
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{
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struct mcp_sa11x0 *m = priv(mcp);
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divisor /= 32;
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m->mccr0 &= ~0x0000007f;
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m->mccr0 |= divisor;
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writel_relaxed(m->mccr0, MCCR0(m));
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}
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/*
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* Write data to the device. The bit should be set after 3 subframe
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* times (each frame is 64 clocks). We wait a maximum of 6 subframes.
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* We really should try doing something more productive while we
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* wait.
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*/
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static void
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mcp_sa11x0_write(struct mcp *mcp, unsigned int reg, unsigned int val)
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{
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struct mcp_sa11x0 *m = priv(mcp);
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int ret = -ETIME;
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int i;
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writel_relaxed(reg << 17 | MCDR2_Wr | (val & 0xffff), MCDR2(m));
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for (i = 0; i < 2; i++) {
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udelay(mcp->rw_timeout);
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if (readl_relaxed(MCSR(m)) & MCSR_CWC) {
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ret = 0;
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break;
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}
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}
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if (ret < 0)
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printk(KERN_WARNING "mcp: write timed out\n");
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}
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/*
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* Read data from the device. The bit should be set after 3 subframe
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* times (each frame is 64 clocks). We wait a maximum of 6 subframes.
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* We really should try doing something more productive while we
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* wait.
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*/
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static unsigned int
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mcp_sa11x0_read(struct mcp *mcp, unsigned int reg)
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{
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struct mcp_sa11x0 *m = priv(mcp);
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int ret = -ETIME;
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int i;
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writel_relaxed(reg << 17 | MCDR2_Rd, MCDR2(m));
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for (i = 0; i < 2; i++) {
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udelay(mcp->rw_timeout);
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if (readl_relaxed(MCSR(m)) & MCSR_CRC) {
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ret = readl_relaxed(MCDR2(m)) & 0xffff;
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break;
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}
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}
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if (ret < 0)
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printk(KERN_WARNING "mcp: read timed out\n");
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return ret;
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}
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static void mcp_sa11x0_enable(struct mcp *mcp)
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{
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struct mcp_sa11x0 *m = priv(mcp);
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writel(-1, MCSR(m));
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m->mccr0 |= MCCR0_MCE;
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writel_relaxed(m->mccr0, MCCR0(m));
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}
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static void mcp_sa11x0_disable(struct mcp *mcp)
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{
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struct mcp_sa11x0 *m = priv(mcp);
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m->mccr0 &= ~MCCR0_MCE;
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writel_relaxed(m->mccr0, MCCR0(m));
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}
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/*
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* Our methods.
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*/
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static struct mcp_ops mcp_sa11x0 = {
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.set_telecom_divisor = mcp_sa11x0_set_telecom_divisor,
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.set_audio_divisor = mcp_sa11x0_set_audio_divisor,
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.reg_write = mcp_sa11x0_write,
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.reg_read = mcp_sa11x0_read,
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.enable = mcp_sa11x0_enable,
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.disable = mcp_sa11x0_disable,
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};
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static int mcp_sa11x0_probe(struct platform_device *dev)
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{
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struct mcp_plat_data *data = dev->dev.platform_data;
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struct resource *mem0, *mem1;
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struct mcp_sa11x0 *m;
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struct mcp *mcp;
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int ret;
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if (!data)
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return -ENODEV;
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mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0);
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mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1);
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if (!mem0 || !mem1)
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return -ENXIO;
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if (!request_mem_region(mem0->start, resource_size(mem0),
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DRIVER_NAME)) {
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ret = -EBUSY;
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goto err_mem0;
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}
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if (!request_mem_region(mem1->start, resource_size(mem1),
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DRIVER_NAME)) {
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ret = -EBUSY;
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goto err_mem1;
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}
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mcp = mcp_host_alloc(&dev->dev, sizeof(struct mcp_sa11x0));
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if (!mcp) {
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ret = -ENOMEM;
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goto err_alloc;
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}
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mcp->owner = THIS_MODULE;
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mcp->ops = &mcp_sa11x0;
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mcp->sclk_rate = data->sclk_rate;
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m = priv(mcp);
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m->mccr0 = data->mccr0 | 0x7f7f;
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m->mccr1 = data->mccr1;
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m->base0 = ioremap(mem0->start, resource_size(mem0));
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m->base1 = ioremap(mem1->start, resource_size(mem1));
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if (!m->base0 || !m->base1) {
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ret = -ENOMEM;
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goto err_ioremap;
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}
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platform_set_drvdata(dev, mcp);
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/*
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* Initialise device. Note that we initially
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* set the sampling rate to minimum.
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*/
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writel_relaxed(-1, MCSR(m));
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writel_relaxed(m->mccr1, MCCR1(m));
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writel_relaxed(m->mccr0, MCCR0(m));
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/*
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* Calculate the read/write timeout (us) from the bit clock
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* rate. This is the period for 3 64-bit frames. Always
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* round this time up.
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*/
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mcp->rw_timeout = (64 * 3 * 1000000 + mcp->sclk_rate - 1) /
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mcp->sclk_rate;
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ret = mcp_host_add(mcp, data->codec_pdata);
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if (ret == 0)
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return 0;
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platform_set_drvdata(dev, NULL);
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err_ioremap:
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iounmap(m->base1);
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iounmap(m->base0);
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mcp_host_free(mcp);
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err_alloc:
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release_mem_region(mem1->start, resource_size(mem1));
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err_mem1:
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release_mem_region(mem0->start, resource_size(mem0));
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err_mem0:
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return ret;
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}
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static int mcp_sa11x0_remove(struct platform_device *dev)
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{
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struct mcp *mcp = platform_get_drvdata(dev);
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struct mcp_sa11x0 *m = priv(mcp);
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struct resource *mem0, *mem1;
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if (m->mccr0 & MCCR0_MCE)
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dev_warn(&dev->dev,
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"device left active (missing disable call?)\n");
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mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0);
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mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1);
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platform_set_drvdata(dev, NULL);
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mcp_host_del(mcp);
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iounmap(m->base1);
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iounmap(m->base0);
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mcp_host_free(mcp);
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release_mem_region(mem1->start, resource_size(mem1));
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release_mem_region(mem0->start, resource_size(mem0));
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int mcp_sa11x0_suspend(struct device *dev)
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{
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struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev));
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if (m->mccr0 & MCCR0_MCE)
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dev_warn(dev, "device left active (missing disable call?)\n");
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writel(m->mccr0 & ~MCCR0_MCE, MCCR0(m));
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return 0;
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}
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static int mcp_sa11x0_resume(struct device *dev)
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{
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struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev));
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writel_relaxed(m->mccr1, MCCR1(m));
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writel_relaxed(m->mccr0, MCCR0(m));
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return 0;
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}
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#endif
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static const struct dev_pm_ops mcp_sa11x0_pm_ops = {
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#ifdef CONFIG_PM_SLEEP
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.suspend = mcp_sa11x0_suspend,
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.freeze = mcp_sa11x0_suspend,
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.poweroff = mcp_sa11x0_suspend,
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.resume_noirq = mcp_sa11x0_resume,
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.thaw_noirq = mcp_sa11x0_resume,
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.restore_noirq = mcp_sa11x0_resume,
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#endif
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};
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static struct platform_driver mcp_sa11x0_driver = {
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.probe = mcp_sa11x0_probe,
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.remove = mcp_sa11x0_remove,
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.driver = {
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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.pm = &mcp_sa11x0_pm_ops,
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},
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};
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/*
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* This needs re-working
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*/
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module_platform_driver(mcp_sa11x0_driver);
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MODULE_ALIAS("platform:" DRIVER_NAME);
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MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
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MODULE_DESCRIPTION("SA11x0 multimedia communications port driver");
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MODULE_LICENSE("GPL");
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