2 * General Purpose functions for the global management of the
3 * 8260 Communication Processor Module.
4 * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com>
5 * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
8 * 2006 (c) MontaVista Software, Inc.
9 * Vitaly Bordug <vbordug@ru.mvista.com>
10 * Merged to arch/powerpc from arch/ppc/syslib/cpm2_common.c
12 * This file is licensed under the terms of the GNU General Public License
13 * version 2. This program is licensed "as is" without any warranty of any
14 * kind, whether express or implied.
19 * In addition to the individual control of the communication
20 * channels, there are a few functions that globally affect the
21 * communication processor.
23 * Buffer descriptors must be allocated from the dual ported memory
24 * space. The allocator for that is here. When the communication
25 * process is reset, we reclaim the memory available. There is
26 * currently no deallocator for this memory.
28 #include <linux/errno.h>
29 #include <linux/sched.h>
30 #include <linux/kernel.h>
31 #include <linux/param.h>
32 #include <linux/string.h>
34 #include <linux/interrupt.h>
35 #include <linux/module.h>
38 #include <asm/mpc8260.h>
40 #include <asm/pgtable.h>
42 #include <asm/rheap.h>
43 #include <asm/fs_pd.h>
45 #include <sysdev/fsl_soc.h>
47 static void cpm2_dpinit(void);
48 cpm_cpm2_t *cpmp; /* Pointer to comm processor space */
50 /* We allocate this here because it is used almost exclusively for
51 * the communication processor devices.
53 cpm2_map_t *cpm2_immr;
55 #define CPM_MAP_SIZE (0x40000) /* 256k - the PQ3 reserve this amount
56 of space for CPM as it is larger
62 cpm2_immr = (cpm2_map_t *)ioremap(CPM_MAP_ADDR, CPM_MAP_SIZE);
64 /* Reclaim the DP memory for our use.
68 /* Tell everyone where the comm processor resides.
70 cpmp = &cpm2_immr->im_cpm;
73 /* Set a baud rate generator. This needs lots of work. There are
74 * eight BRGs, which can be connected to the CPM channels or output
75 * as clocks. The BRGs are in two different block of internal
76 * memory mapped space.
77 * The baud rate clock is the system clock divided by something.
78 * It was set up long ago during the initial boot phase and is
80 * Baud rate clocks are zero-based in the driver code (as that maps
81 * to port numbers). Documentation uses 1-based numbering.
83 #define BRG_INT_CLK (get_brgfreq())
84 #define BRG_UART_CLK (BRG_INT_CLK/16)
86 /* This function is used by UARTS, or anything else that uses a 16x
90 cpm_setbrg(uint brg, uint rate)
94 /* This is good enough to get SMCs running.....
97 bp = (uint *)&cpm2_immr->im_brgc1;
99 bp = (uint *)&cpm2_immr->im_brgc5;
103 *bp = ((BRG_UART_CLK / rate) << 1) | CPM_BRG_EN;
106 /* This function is used to set high speed synchronous baud rate
110 cpm2_fastbrg(uint brg, uint rate, int div16)
115 bp = (uint *)&cpm2_immr->im_brgc1;
118 bp = (uint *)&cpm2_immr->im_brgc5;
122 *bp = ((BRG_INT_CLK / rate) << 1) | CPM_BRG_EN;
124 *bp |= CPM_BRG_DIV16;
128 * dpalloc / dpfree bits.
130 static spinlock_t cpm_dpmem_lock;
131 /* 16 blocks should be enough to satisfy all requests
132 * until the memory subsystem goes up... */
133 static rh_block_t cpm_boot_dpmem_rh_block[16];
134 static rh_info_t cpm_dpmem_info;
136 static void cpm2_dpinit(void)
138 spin_lock_init(&cpm_dpmem_lock);
140 /* initialize the info header */
141 rh_init(&cpm_dpmem_info, 1,
142 sizeof(cpm_boot_dpmem_rh_block) /
143 sizeof(cpm_boot_dpmem_rh_block[0]),
144 cpm_boot_dpmem_rh_block);
146 /* Attach the usable dpmem area */
147 /* XXX: This is actually crap. CPM_DATAONLY_BASE and
148 * CPM_DATAONLY_SIZE is only a subset of the available dpram. It
149 * varies with the processor and the microcode patches activated.
150 * But the following should be at least safe.
152 rh_attach_region(&cpm_dpmem_info, (void *)CPM_DATAONLY_BASE,
156 /* This function returns an index into the DPRAM area.
158 uint cpm_dpalloc(uint size, uint align)
163 spin_lock_irqsave(&cpm_dpmem_lock, flags);
164 cpm_dpmem_info.alignment = align;
165 start = rh_alloc(&cpm_dpmem_info, size, "commproc");
166 spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
170 EXPORT_SYMBOL(cpm_dpalloc);
172 int cpm_dpfree(uint offset)
177 spin_lock_irqsave(&cpm_dpmem_lock, flags);
178 ret = rh_free(&cpm_dpmem_info, (void *)offset);
179 spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
183 EXPORT_SYMBOL(cpm_dpfree);
185 /* not sure if this is ever needed */
186 uint cpm_dpalloc_fixed(uint offset, uint size, uint align)
191 spin_lock_irqsave(&cpm_dpmem_lock, flags);
192 cpm_dpmem_info.alignment = align;
193 start = rh_alloc_fixed(&cpm_dpmem_info, (void *)offset, size, "commproc");
194 spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
198 EXPORT_SYMBOL(cpm_dpalloc_fixed);
200 void cpm_dpdump(void)
202 rh_dump(&cpm_dpmem_info);
204 EXPORT_SYMBOL(cpm_dpdump);
206 void *cpm_dpram_addr(uint offset)
208 return (void *)&cpm2_immr->im_dprambase[offset];
210 EXPORT_SYMBOL(cpm_dpram_addr);