357 lines
8.3 KiB
C
357 lines
8.3 KiB
C
/*
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* General Purpose functions for the global management of the
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* 8260 Communication Processor Module.
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* Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com>
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* Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
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* 2.3.99 Updates
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*
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* 2006 (c) MontaVista Software, Inc.
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* Vitaly Bordug <vbordug@ru.mvista.com>
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* Merged to arch/powerpc from arch/ppc/syslib/cpm2_common.c
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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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*
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* In addition to the individual control of the communication
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* channels, there are a few functions that globally affect the
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* communication processor.
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*
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* Buffer descriptors must be allocated from the dual ported memory
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* space. The allocator for that is here. When the communication
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* process is reset, we reclaim the memory available. There is
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* currently no deallocator for this memory.
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*/
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/param.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/mpc8260.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/cpm2.h>
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#include <asm/rheap.h>
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#include <asm/fs_pd.h>
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#include <sysdev/fsl_soc.h>
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cpm_cpm2_t __iomem *cpmp; /* Pointer to comm processor space */
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/* We allocate this here because it is used almost exclusively for
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* the communication processor devices.
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*/
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cpm2_map_t __iomem *cpm2_immr;
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EXPORT_SYMBOL(cpm2_immr);
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#define CPM_MAP_SIZE (0x40000) /* 256k - the PQ3 reserve this amount
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of space for CPM as it is larger
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than on PQ2 */
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void __init cpm2_reset(void)
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{
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#ifdef CONFIG_PPC_85xx
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cpm2_immr = ioremap(get_immrbase() + 0x80000, CPM_MAP_SIZE);
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#else
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cpm2_immr = ioremap(get_immrbase(), CPM_MAP_SIZE);
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#endif
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/* Tell everyone where the comm processor resides.
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*/
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cpmp = &cpm2_immr->im_cpm;
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#ifndef CONFIG_PPC_EARLY_DEBUG_CPM
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/* Reset the CPM.
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*/
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cpm_command(CPM_CR_RST, 0);
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#endif
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}
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static DEFINE_SPINLOCK(cmd_lock);
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#define MAX_CR_CMD_LOOPS 10000
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int cpm_command(u32 command, u8 opcode)
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{
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int i, ret;
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unsigned long flags;
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spin_lock_irqsave(&cmd_lock, flags);
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ret = 0;
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out_be32(&cpmp->cp_cpcr, command | opcode | CPM_CR_FLG);
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for (i = 0; i < MAX_CR_CMD_LOOPS; i++)
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if ((in_be32(&cpmp->cp_cpcr) & CPM_CR_FLG) == 0)
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goto out;
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printk(KERN_ERR "%s(): Not able to issue CPM command\n", __func__);
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ret = -EIO;
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out:
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spin_unlock_irqrestore(&cmd_lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(cpm_command);
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/* Set a baud rate generator. This needs lots of work. There are
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* eight BRGs, which can be connected to the CPM channels or output
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* as clocks. The BRGs are in two different block of internal
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* memory mapped space.
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* The baud rate clock is the system clock divided by something.
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* It was set up long ago during the initial boot phase and is
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* is given to us.
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* Baud rate clocks are zero-based in the driver code (as that maps
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* to port numbers). Documentation uses 1-based numbering.
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*/
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void __cpm2_setbrg(uint brg, uint rate, uint clk, int div16, int src)
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{
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u32 __iomem *bp;
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u32 val;
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/* This is good enough to get SMCs running.....
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*/
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if (brg < 4) {
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bp = cpm2_map_size(im_brgc1, 16);
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} else {
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bp = cpm2_map_size(im_brgc5, 16);
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brg -= 4;
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}
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bp += brg;
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/* Round the clock divider to the nearest integer. */
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val = (((clk * 2 / rate) - 1) & ~1) | CPM_BRG_EN | src;
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if (div16)
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val |= CPM_BRG_DIV16;
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out_be32(bp, val);
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cpm2_unmap(bp);
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}
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EXPORT_SYMBOL(__cpm2_setbrg);
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int cpm2_clk_setup(enum cpm_clk_target target, int clock, int mode)
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{
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int ret = 0;
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int shift;
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int i, bits = 0;
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cpmux_t __iomem *im_cpmux;
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u32 __iomem *reg;
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u32 mask = 7;
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u8 clk_map[][3] = {
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{CPM_CLK_FCC1, CPM_BRG5, 0},
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{CPM_CLK_FCC1, CPM_BRG6, 1},
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{CPM_CLK_FCC1, CPM_BRG7, 2},
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{CPM_CLK_FCC1, CPM_BRG8, 3},
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{CPM_CLK_FCC1, CPM_CLK9, 4},
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{CPM_CLK_FCC1, CPM_CLK10, 5},
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{CPM_CLK_FCC1, CPM_CLK11, 6},
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{CPM_CLK_FCC1, CPM_CLK12, 7},
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{CPM_CLK_FCC2, CPM_BRG5, 0},
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{CPM_CLK_FCC2, CPM_BRG6, 1},
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{CPM_CLK_FCC2, CPM_BRG7, 2},
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{CPM_CLK_FCC2, CPM_BRG8, 3},
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{CPM_CLK_FCC2, CPM_CLK13, 4},
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{CPM_CLK_FCC2, CPM_CLK14, 5},
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{CPM_CLK_FCC2, CPM_CLK15, 6},
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{CPM_CLK_FCC2, CPM_CLK16, 7},
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{CPM_CLK_FCC3, CPM_BRG5, 0},
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{CPM_CLK_FCC3, CPM_BRG6, 1},
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{CPM_CLK_FCC3, CPM_BRG7, 2},
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{CPM_CLK_FCC3, CPM_BRG8, 3},
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{CPM_CLK_FCC3, CPM_CLK13, 4},
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{CPM_CLK_FCC3, CPM_CLK14, 5},
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{CPM_CLK_FCC3, CPM_CLK15, 6},
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{CPM_CLK_FCC3, CPM_CLK16, 7},
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{CPM_CLK_SCC1, CPM_BRG1, 0},
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{CPM_CLK_SCC1, CPM_BRG2, 1},
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{CPM_CLK_SCC1, CPM_BRG3, 2},
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{CPM_CLK_SCC1, CPM_BRG4, 3},
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{CPM_CLK_SCC1, CPM_CLK11, 4},
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{CPM_CLK_SCC1, CPM_CLK12, 5},
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{CPM_CLK_SCC1, CPM_CLK3, 6},
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{CPM_CLK_SCC1, CPM_CLK4, 7},
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{CPM_CLK_SCC2, CPM_BRG1, 0},
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{CPM_CLK_SCC2, CPM_BRG2, 1},
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{CPM_CLK_SCC2, CPM_BRG3, 2},
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{CPM_CLK_SCC2, CPM_BRG4, 3},
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{CPM_CLK_SCC2, CPM_CLK11, 4},
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{CPM_CLK_SCC2, CPM_CLK12, 5},
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{CPM_CLK_SCC2, CPM_CLK3, 6},
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{CPM_CLK_SCC2, CPM_CLK4, 7},
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{CPM_CLK_SCC3, CPM_BRG1, 0},
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{CPM_CLK_SCC3, CPM_BRG2, 1},
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{CPM_CLK_SCC3, CPM_BRG3, 2},
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{CPM_CLK_SCC3, CPM_BRG4, 3},
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{CPM_CLK_SCC3, CPM_CLK5, 4},
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{CPM_CLK_SCC3, CPM_CLK6, 5},
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{CPM_CLK_SCC3, CPM_CLK7, 6},
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{CPM_CLK_SCC3, CPM_CLK8, 7},
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{CPM_CLK_SCC4, CPM_BRG1, 0},
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{CPM_CLK_SCC4, CPM_BRG2, 1},
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{CPM_CLK_SCC4, CPM_BRG3, 2},
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{CPM_CLK_SCC4, CPM_BRG4, 3},
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{CPM_CLK_SCC4, CPM_CLK5, 4},
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{CPM_CLK_SCC4, CPM_CLK6, 5},
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{CPM_CLK_SCC4, CPM_CLK7, 6},
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{CPM_CLK_SCC4, CPM_CLK8, 7},
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};
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im_cpmux = cpm2_map(im_cpmux);
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switch (target) {
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case CPM_CLK_SCC1:
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reg = &im_cpmux->cmx_scr;
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shift = 24;
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break;
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case CPM_CLK_SCC2:
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reg = &im_cpmux->cmx_scr;
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shift = 16;
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break;
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case CPM_CLK_SCC3:
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reg = &im_cpmux->cmx_scr;
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shift = 8;
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break;
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case CPM_CLK_SCC4:
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reg = &im_cpmux->cmx_scr;
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shift = 0;
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break;
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case CPM_CLK_FCC1:
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reg = &im_cpmux->cmx_fcr;
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shift = 24;
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break;
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case CPM_CLK_FCC2:
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reg = &im_cpmux->cmx_fcr;
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shift = 16;
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break;
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case CPM_CLK_FCC3:
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reg = &im_cpmux->cmx_fcr;
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shift = 8;
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break;
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default:
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printk(KERN_ERR "cpm2_clock_setup: invalid clock target\n");
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return -EINVAL;
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}
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for (i = 0; i < ARRAY_SIZE(clk_map); i++) {
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if (clk_map[i][0] == target && clk_map[i][1] == clock) {
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bits = clk_map[i][2];
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break;
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}
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}
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if (i == ARRAY_SIZE(clk_map))
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ret = -EINVAL;
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bits <<= shift;
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mask <<= shift;
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if (mode == CPM_CLK_RTX) {
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bits |= bits << 3;
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mask |= mask << 3;
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} else if (mode == CPM_CLK_RX) {
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bits <<= 3;
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mask <<= 3;
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}
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out_be32(reg, (in_be32(reg) & ~mask) | bits);
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cpm2_unmap(im_cpmux);
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return ret;
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}
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int cpm2_smc_clk_setup(enum cpm_clk_target target, int clock)
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{
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int ret = 0;
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int shift;
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int i, bits = 0;
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cpmux_t __iomem *im_cpmux;
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u8 __iomem *reg;
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u8 mask = 3;
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u8 clk_map[][3] = {
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{CPM_CLK_SMC1, CPM_BRG1, 0},
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{CPM_CLK_SMC1, CPM_BRG7, 1},
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{CPM_CLK_SMC1, CPM_CLK7, 2},
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{CPM_CLK_SMC1, CPM_CLK9, 3},
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{CPM_CLK_SMC2, CPM_BRG2, 0},
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{CPM_CLK_SMC2, CPM_BRG8, 1},
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{CPM_CLK_SMC2, CPM_CLK4, 2},
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{CPM_CLK_SMC2, CPM_CLK15, 3},
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};
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im_cpmux = cpm2_map(im_cpmux);
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switch (target) {
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case CPM_CLK_SMC1:
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reg = &im_cpmux->cmx_smr;
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mask = 3;
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shift = 4;
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break;
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case CPM_CLK_SMC2:
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reg = &im_cpmux->cmx_smr;
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mask = 3;
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shift = 0;
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break;
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default:
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printk(KERN_ERR "cpm2_smc_clock_setup: invalid clock target\n");
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return -EINVAL;
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}
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for (i = 0; i < ARRAY_SIZE(clk_map); i++) {
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if (clk_map[i][0] == target && clk_map[i][1] == clock) {
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bits = clk_map[i][2];
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break;
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}
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}
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if (i == ARRAY_SIZE(clk_map))
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ret = -EINVAL;
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bits <<= shift;
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mask <<= shift;
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out_8(reg, (in_8(reg) & ~mask) | bits);
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cpm2_unmap(im_cpmux);
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return ret;
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}
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struct cpm2_ioports {
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u32 dir, par, sor, odr, dat;
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u32 res[3];
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};
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void cpm2_set_pin(int port, int pin, int flags)
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{
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struct cpm2_ioports __iomem *iop =
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(struct cpm2_ioports __iomem *)&cpm2_immr->im_ioport;
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pin = 1 << (31 - pin);
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if (flags & CPM_PIN_OUTPUT)
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setbits32(&iop[port].dir, pin);
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else
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clrbits32(&iop[port].dir, pin);
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if (!(flags & CPM_PIN_GPIO))
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setbits32(&iop[port].par, pin);
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else
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clrbits32(&iop[port].par, pin);
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if (flags & CPM_PIN_SECONDARY)
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setbits32(&iop[port].sor, pin);
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else
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clrbits32(&iop[port].sor, pin);
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if (flags & CPM_PIN_OPENDRAIN)
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setbits32(&iop[port].odr, pin);
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else
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clrbits32(&iop[port].odr, pin);
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}
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