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Diffstat (limited to 'arch/powerpc/sysdev/cpm2.c')
| -rw-r--r-- | arch/powerpc/sysdev/cpm2.c | 469 |
1 files changed, 469 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/cpm2.c b/arch/powerpc/sysdev/cpm2.c new file mode 100644 index 000000000000..7be711232124 --- /dev/null +++ b/arch/powerpc/sysdev/cpm2.c @@ -0,0 +1,469 @@ +/* + * General Purpose functions for the global management of the + * 8260 Communication Processor Module. + * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com> + * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com) + * 2.3.99 Updates + * + * 2006 (c) MontaVista Software, Inc. + * Vitaly Bordug <vbordug@ru.mvista.com> + * Merged to arch/powerpc from arch/ppc/syslib/cpm2_common.c + * + * 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. + */ + +/* + * + * In addition to the individual control of the communication + * channels, there are a few functions that globally affect the + * communication processor. + * + * Buffer descriptors must be allocated from the dual ported memory + * space. The allocator for that is here. When the communication + * process is reset, we reclaim the memory available. There is + * currently no deallocator for this memory. + */ +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/param.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/of.h> + +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/mpc8260.h> +#include <asm/page.h> +#include <asm/pgtable.h> +#include <asm/cpm2.h> +#include <asm/rheap.h> +#include <asm/fs_pd.h> + +#include <sysdev/fsl_soc.h> + +#ifndef CONFIG_PPC_CPM_NEW_BINDING +static void cpm2_dpinit(void); +#endif + +cpm_cpm2_t __iomem *cpmp; /* Pointer to comm processor space */ + +/* We allocate this here because it is used almost exclusively for + * the communication processor devices. + */ +cpm2_map_t __iomem *cpm2_immr; + +#define CPM_MAP_SIZE (0x40000) /* 256k - the PQ3 reserve this amount + of space for CPM as it is larger + than on PQ2 */ + +void __init cpm2_reset(void) +{ +#ifdef CONFIG_PPC_85xx + cpm2_immr = ioremap(CPM_MAP_ADDR, CPM_MAP_SIZE); +#else + cpm2_immr = ioremap(get_immrbase(), CPM_MAP_SIZE); +#endif + + /* Reclaim the DP memory for our use. + */ +#ifdef CONFIG_PPC_CPM_NEW_BINDING + cpm_muram_init(); +#else + cpm2_dpinit(); +#endif + + /* Tell everyone where the comm processor resides. + */ + cpmp = &cpm2_immr->im_cpm; +} + +static DEFINE_SPINLOCK(cmd_lock); + +#define MAX_CR_CMD_LOOPS 10000 + +int cpm_command(u32 command, u8 opcode) +{ + int i, ret; + unsigned long flags; + + spin_lock_irqsave(&cmd_lock, flags); + + ret = 0; + out_be32(&cpmp->cp_cpcr, command | opcode | CPM_CR_FLG); + for (i = 0; i < MAX_CR_CMD_LOOPS; i++) + if ((in_be32(&cpmp->cp_cpcr) & CPM_CR_FLG) == 0) + goto out; + + printk(KERN_ERR "%s(): Not able to issue CPM command\n", __FUNCTION__); + ret = -EIO; +out: + spin_unlock_irqrestore(&cmd_lock, flags); + return ret; +} +EXPORT_SYMBOL(cpm_command); + +/* Set a baud rate generator. This needs lots of work. There are + * eight BRGs, which can be connected to the CPM channels or output + * as clocks. The BRGs are in two different block of internal + * memory mapped space. + * The baud rate clock is the system clock divided by something. + * It was set up long ago during the initial boot phase and is + * is given to us. + * Baud rate clocks are zero-based in the driver code (as that maps + * to port numbers). Documentation uses 1-based numbering. + */ +#define BRG_INT_CLK (get_brgfreq()) +#define BRG_UART_CLK (BRG_INT_CLK/16) + +/* This function is used by UARTS, or anything else that uses a 16x + * oversampled clock. + */ +void +cpm_setbrg(uint brg, uint rate) +{ + u32 __iomem *bp; + + /* This is good enough to get SMCs running..... + */ + if (brg < 4) { + bp = cpm2_map_size(im_brgc1, 16); + } else { + bp = cpm2_map_size(im_brgc5, 16); + brg -= 4; + } + bp += brg; + out_be32(bp, (((BRG_UART_CLK / rate) - 1) << 1) | CPM_BRG_EN); + + cpm2_unmap(bp); +} + +/* This function is used to set high speed synchronous baud rate + * clocks. + */ +void +cpm2_fastbrg(uint brg, uint rate, int div16) +{ + u32 __iomem *bp; + u32 val; + + if (brg < 4) { + bp = cpm2_map_size(im_brgc1, 16); + } else { + bp = cpm2_map_size(im_brgc5, 16); + brg -= 4; + } + bp += brg; + val = ((BRG_INT_CLK / rate) << 1) | CPM_BRG_EN; + if (div16) + val |= CPM_BRG_DIV16; + + out_be32(bp, val); + cpm2_unmap(bp); +} + +int cpm2_clk_setup(enum cpm_clk_target target, int clock, int mode) +{ + int ret = 0; + int shift; + int i, bits = 0; + cpmux_t __iomem *im_cpmux; + u32 __iomem *reg; + u32 mask = 7; + + u8 clk_map[][3] = { + {CPM_CLK_FCC1, CPM_BRG5, 0}, + {CPM_CLK_FCC1, CPM_BRG6, 1}, + {CPM_CLK_FCC1, CPM_BRG7, 2}, + {CPM_CLK_FCC1, CPM_BRG8, 3}, + {CPM_CLK_FCC1, CPM_CLK9, 4}, + {CPM_CLK_FCC1, CPM_CLK10, 5}, + {CPM_CLK_FCC1, CPM_CLK11, 6}, + {CPM_CLK_FCC1, CPM_CLK12, 7}, + {CPM_CLK_FCC2, CPM_BRG5, 0}, + {CPM_CLK_FCC2, CPM_BRG6, 1}, + {CPM_CLK_FCC2, CPM_BRG7, 2}, + {CPM_CLK_FCC2, CPM_BRG8, 3}, + {CPM_CLK_FCC2, CPM_CLK13, 4}, + {CPM_CLK_FCC2, CPM_CLK14, 5}, + {CPM_CLK_FCC2, CPM_CLK15, 6}, + {CPM_CLK_FCC2, CPM_CLK16, 7}, + {CPM_CLK_FCC3, CPM_BRG5, 0}, + {CPM_CLK_FCC3, CPM_BRG6, 1}, + {CPM_CLK_FCC3, CPM_BRG7, 2}, + {CPM_CLK_FCC3, CPM_BRG8, 3}, + {CPM_CLK_FCC3, CPM_CLK13, 4}, + {CPM_CLK_FCC3, CPM_CLK14, 5}, + {CPM_CLK_FCC3, CPM_CLK15, 6}, + {CPM_CLK_FCC3, CPM_CLK16, 7}, + {CPM_CLK_SCC1, CPM_BRG1, 0}, + {CPM_CLK_SCC1, CPM_BRG2, 1}, + {CPM_CLK_SCC1, CPM_BRG3, 2}, + {CPM_CLK_SCC1, CPM_BRG4, 3}, + {CPM_CLK_SCC1, CPM_CLK11, 4}, + {CPM_CLK_SCC1, CPM_CLK12, 5}, + {CPM_CLK_SCC1, CPM_CLK3, 6}, + {CPM_CLK_SCC1, CPM_CLK4, 7}, + {CPM_CLK_SCC2, CPM_BRG1, 0}, + {CPM_CLK_SCC2, CPM_BRG2, 1}, + {CPM_CLK_SCC2, CPM_BRG3, 2}, + {CPM_CLK_SCC2, CPM_BRG4, 3}, + {CPM_CLK_SCC2, CPM_CLK11, 4}, + {CPM_CLK_SCC2, CPM_CLK12, 5}, + {CPM_CLK_SCC2, CPM_CLK3, 6}, + {CPM_CLK_SCC2, CPM_CLK4, 7}, + {CPM_CLK_SCC3, CPM_BRG1, 0}, + {CPM_CLK_SCC3, CPM_BRG2, 1}, + {CPM_CLK_SCC3, CPM_BRG3, 2}, + {CPM_CLK_SCC3, CPM_BRG4, 3}, + {CPM_CLK_SCC3, CPM_CLK5, 4}, + {CPM_CLK_SCC3, CPM_CLK6, 5}, + {CPM_CLK_SCC3, CPM_CLK7, 6}, + {CPM_CLK_SCC3, CPM_CLK8, 7}, + {CPM_CLK_SCC4, CPM_BRG1, 0}, + {CPM_CLK_SCC4, CPM_BRG2, 1}, + {CPM_CLK_SCC4, CPM_BRG3, 2}, + {CPM_CLK_SCC4, CPM_BRG4, 3}, + {CPM_CLK_SCC4, CPM_CLK5, 4}, + {CPM_CLK_SCC4, CPM_CLK6, 5}, + {CPM_CLK_SCC4, CPM_CLK7, 6}, + {CPM_CLK_SCC4, CPM_CLK8, 7}, + }; + + im_cpmux = cpm2_map(im_cpmux); + + switch (target) { + case CPM_CLK_SCC1: + reg = &im_cpmux->cmx_scr; + shift = 24; + case CPM_CLK_SCC2: + reg = &im_cpmux->cmx_scr; + shift = 16; + break; + case CPM_CLK_SCC3: + reg = &im_cpmux->cmx_scr; + shift = 8; + break; + case CPM_CLK_SCC4: + reg = &im_cpmux->cmx_scr; + shift = 0; + break; + case CPM_CLK_FCC1: + reg = &im_cpmux->cmx_fcr; + shift = 24; + break; + case CPM_CLK_FCC2: + reg = &im_cpmux->cmx_fcr; + shift = 16; + break; + case CPM_CLK_FCC3: + reg = &im_cpmux->cmx_fcr; + shift = 8; + break; + default: + printk(KERN_ERR "cpm2_clock_setup: invalid clock target\n"); + return -EINVAL; + } + + if (mode == CPM_CLK_RX) + shift += 3; + + for (i = 0; i < ARRAY_SIZE(clk_map); i++) { + if (clk_map[i][0] == target && clk_map[i][1] == clock) { + bits = clk_map[i][2]; + break; + } + } + if (i == ARRAY_SIZE(clk_map)) + ret = -EINVAL; + + bits <<= shift; + mask <<= shift; + + out_be32(reg, (in_be32(reg) & ~mask) | bits); + + cpm2_unmap(im_cpmux); + return ret; +} + +int cpm2_smc_clk_setup(enum cpm_clk_target target, int clock) +{ + int ret = 0; + int shift; + int i, bits = 0; + cpmux_t __iomem *im_cpmux; + u8 __iomem *reg; + u8 mask = 3; + + u8 clk_map[][3] = { + {CPM_CLK_SMC1, CPM_BRG1, 0}, + {CPM_CLK_SMC1, CPM_BRG7, 1}, + {CPM_CLK_SMC1, CPM_CLK7, 2}, + {CPM_CLK_SMC1, CPM_CLK9, 3}, + {CPM_CLK_SMC2, CPM_BRG2, 0}, + {CPM_CLK_SMC2, CPM_BRG8, 1}, + {CPM_CLK_SMC2, CPM_CLK4, 2}, + {CPM_CLK_SMC2, CPM_CLK15, 3}, + }; + + im_cpmux = cpm2_map(im_cpmux); + + switch (target) { + case CPM_CLK_SMC1: + reg = &im_cpmux->cmx_smr; + mask = 3; + shift = 4; + break; + case CPM_CLK_SMC2: + reg = &im_cpmux->cmx_smr; + mask = 3; + shift = 0; + break; + default: + printk(KERN_ERR "cpm2_smc_clock_setup: invalid clock target\n"); + return -EINVAL; + } + + for (i = 0; i < ARRAY_SIZE(clk_map); i++) { + if (clk_map[i][0] == target && clk_map[i][1] == clock) { + bits = clk_map[i][2]; + break; + } + } + if (i == ARRAY_SIZE(clk_map)) + ret = -EINVAL; + + bits <<= shift; + mask <<= shift; + + out_8(reg, (in_8(reg) & ~mask) | bits); + + cpm2_unmap(im_cpmux); + return ret; +} + +#ifndef CONFIG_PPC_CPM_NEW_BINDING +/* + * dpalloc / dpfree bits. + */ +static spinlock_t cpm_dpmem_lock; +/* 16 blocks should be enough to satisfy all requests + * until the memory subsystem goes up... */ +static rh_block_t cpm_boot_dpmem_rh_block[16]; +static rh_info_t cpm_dpmem_info; +static u8 __iomem *im_dprambase; + +static void cpm2_dpinit(void) +{ + spin_lock_init(&cpm_dpmem_lock); + + /* initialize the info header */ + rh_init(&cpm_dpmem_info, 1, + sizeof(cpm_boot_dpmem_rh_block) / + sizeof(cpm_boot_dpmem_rh_block[0]), + cpm_boot_dpmem_rh_block); + + im_dprambase = cpm2_immr; + + /* Attach the usable dpmem area */ + /* XXX: This is actually crap. CPM_DATAONLY_BASE and + * CPM_DATAONLY_SIZE is only a subset of the available dpram. It + * varies with the processor and the microcode patches activated. + * But the following should be at least safe. + */ + rh_attach_region(&cpm_dpmem_info, CPM_DATAONLY_BASE, CPM_DATAONLY_SIZE); +} + +/* This function returns an index into the DPRAM area. + */ +unsigned long cpm_dpalloc(uint size, uint align) +{ + unsigned long start; + unsigned long flags; + + spin_lock_irqsave(&cpm_dpmem_lock, flags); + cpm_dpmem_info.alignment = align; + start = rh_alloc(&cpm_dpmem_info, size, "commproc"); + spin_unlock_irqrestore(&cpm_dpmem_lock, flags); + + return (uint)start; +} +EXPORT_SYMBOL(cpm_dpalloc); + +int cpm_dpfree(unsigned long offset) +{ + int ret; + unsigned long flags; + + spin_lock_irqsave(&cpm_dpmem_lock, flags); + ret = rh_free(&cpm_dpmem_info, offset); + spin_unlock_irqrestore(&cpm_dpmem_lock, flags); + + return ret; +} +EXPORT_SYMBOL(cpm_dpfree); + +/* not sure if this is ever needed */ +unsigned long cpm_dpalloc_fixed(unsigned long offset, uint size, uint align) +{ + unsigned long start; + unsigned long flags; + + spin_lock_irqsave(&cpm_dpmem_lock, flags); + cpm_dpmem_info.alignment = align; + start = rh_alloc_fixed(&cpm_dpmem_info, offset, size, "commproc"); + spin_unlock_irqrestore(&cpm_dpmem_lock, flags); + + return start; +} +EXPORT_SYMBOL(cpm_dpalloc_fixed); + +void cpm_dpdump(void) +{ + rh_dump(&cpm_dpmem_info); +} +EXPORT_SYMBOL(cpm_dpdump); + +void *cpm_dpram_addr(unsigned long offset) +{ + return (void *)(im_dprambase + offset); +} +EXPORT_SYMBOL(cpm_dpram_addr); +#endif /* !CONFIG_PPC_CPM_NEW_BINDING */ + +struct cpm2_ioports { + u32 dir, par, sor, odr, dat; + u32 res[3]; +}; + +void cpm2_set_pin(int port, int pin, int flags) +{ + struct cpm2_ioports __iomem *iop = + (struct cpm2_ioports __iomem *)&cpm2_immr->im_ioport; + + pin = 1 << (31 - pin); + + if (flags & CPM_PIN_OUTPUT) + setbits32(&iop[port].dir, pin); + else + clrbits32(&iop[port].dir, pin); + + if (!(flags & CPM_PIN_GPIO)) + setbits32(&iop[port].par, pin); + else + clrbits32(&iop[port].par, pin); + + if (flags & CPM_PIN_SECONDARY) + setbits32(&iop[port].sor, pin); + else + clrbits32(&iop[port].sor, pin); + + if (flags & CPM_PIN_OPENDRAIN) + setbits32(&iop[port].odr, pin); + else + clrbits32(&iop[port].odr, pin); +} |