From 7435ac81de2ebe5b312b2435795c4c027d6add75 Mon Sep 17 00:00:00 2001 From: Paul Selkirk Date: Wed, 8 Apr 2015 16:38:45 -0400 Subject: Add EIM HAL. The eim and i2c support are copied from core/platform/novena. In future, we should maybe build a library there, and link it here. --- src/novena-eim.c | 708 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 708 insertions(+) create mode 100644 src/novena-eim.c (limited to 'src/novena-eim.c') diff --git a/src/novena-eim.c b/src/novena-eim.c new file mode 100644 index 0000000..85bfac0 --- /dev/null +++ b/src/novena-eim.c @@ -0,0 +1,708 @@ +/* + * novena-eim.c + * ------------ + * This module contains the userland magic to set up and use the EIM bus. + * + * + * Author: Pavel Shatov + * Copyright (c) 2014-2015, NORDUnet A/S All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * - Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * - Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * - Neither the name of the NORDUnet nor the names of its contributors may + * be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS + * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED + * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +//------------------------------------------------------------------------------ +// Headers +//------------------------------------------------------------------------------ +#include +#include +#include +#include +#include +#include +#include + +#include "novena-eim.h" + + +//------------------------------------------------------------------------------ +// Defines +//------------------------------------------------------------------------------ +#define MEMORY_DEVICE "/dev/mem" + +#define IOMUXC_MUX_MODE_ALT0 0 // 000 + +#define IOMUXC_PAD_CTL_SRE_FAST 1 // 1 +#define IOMUXC_PAD_CTL_DSE_33_OHM 7 // 111 +#define IOMUXC_PAD_CTL_SPEED_MEDIUM_10 2 // 10 +#define IOMUXC_PAD_CTL_ODE_DISABLED 0 // 0 +#define IOMUXC_PAD_CTL_PKE_DISABLED 0 // 0 +#define IOMUXC_PAD_CTL_PUE_PULL 1 // 1 +#define IOMUXC_PAD_CTL_PUS_100K_OHM_PU 2 // 10 +#define IOMUXC_PAD_CTL_HYS_DISABLED 0 // 0 + +#define CCM_CGR_OFF 0 // 00 +#define CCM_CGR_ON_EXCEPT_STOP 3 // 11 + + +//------------------------------------------------------------------------------ +// CPU Registers +//------------------------------------------------------------------------------ +enum IMX6DQ_REGISTER_OFFSET +{ + IOMUXC_SW_MUX_CTL_PAD_EIM_CS0_B = 0x020E00F8, + IOMUXC_SW_MUX_CTL_PAD_EIM_OE_B = 0x020E0100, + IOMUXC_SW_MUX_CTL_PAD_EIM_RW = 0x020E0104, + IOMUXC_SW_MUX_CTL_PAD_EIM_LBA_B = 0x020E0108, + IOMUXC_SW_MUX_CTL_PAD_EIM_AD00 = 0x020E0114, + IOMUXC_SW_MUX_CTL_PAD_EIM_AD01 = 0x020E0118, + IOMUXC_SW_MUX_CTL_PAD_EIM_AD02 = 0x020E011C, + IOMUXC_SW_MUX_CTL_PAD_EIM_AD03 = 0x020E0120, + IOMUXC_SW_MUX_CTL_PAD_EIM_AD04 = 0x020E0124, + IOMUXC_SW_MUX_CTL_PAD_EIM_AD05 = 0x020E0128, + IOMUXC_SW_MUX_CTL_PAD_EIM_AD06 = 0x020E012C, + IOMUXC_SW_MUX_CTL_PAD_EIM_AD07 = 0x020E0130, + IOMUXC_SW_MUX_CTL_PAD_EIM_AD08 = 0x020E0134, + IOMUXC_SW_MUX_CTL_PAD_EIM_AD09 = 0x020E0138, + IOMUXC_SW_MUX_CTL_PAD_EIM_AD10 = 0x020E013C, + IOMUXC_SW_MUX_CTL_PAD_EIM_AD11 = 0x020E0140, + IOMUXC_SW_MUX_CTL_PAD_EIM_AD12 = 0x020E0144, + IOMUXC_SW_MUX_CTL_PAD_EIM_AD13 = 0x020E0148, + IOMUXC_SW_MUX_CTL_PAD_EIM_AD14 = 0x020E014C, + IOMUXC_SW_MUX_CTL_PAD_EIM_AD15 = 0x020E0150, + IOMUXC_SW_MUX_CTL_PAD_EIM_WAIT_B = 0x020E0154, + IOMUXC_SW_MUX_CTL_PAD_EIM_BCLK = 0x020E0158, + + IOMUXC_SW_PAD_CTL_PAD_EIM_CS0_B = 0x020E040C, + IOMUXC_SW_PAD_CTL_PAD_EIM_OE_B = 0x020E0414, + IOMUXC_SW_PAD_CTL_PAD_EIM_RW = 0x020E0418, + IOMUXC_SW_PAD_CTL_PAD_EIM_LBA_B = 0x020E041C, + IOMUXC_SW_PAD_CTL_PAD_EIM_AD00 = 0x020E0428, + IOMUXC_SW_PAD_CTL_PAD_EIM_AD01 = 0x020E042C, + IOMUXC_SW_PAD_CTL_PAD_EIM_AD02 = 0x020E0430, + IOMUXC_SW_PAD_CTL_PAD_EIM_AD03 = 0x020E0434, + IOMUXC_SW_PAD_CTL_PAD_EIM_AD04 = 0x020E0438, + IOMUXC_SW_PAD_CTL_PAD_EIM_AD05 = 0x020E043C, + IOMUXC_SW_PAD_CTL_PAD_EIM_AD06 = 0x020E0440, + IOMUXC_SW_PAD_CTL_PAD_EIM_AD07 = 0x020E0444, + IOMUXC_SW_PAD_CTL_PAD_EIM_AD08 = 0x020E0448, + IOMUXC_SW_PAD_CTL_PAD_EIM_AD09 = 0x020E044C, + IOMUXC_SW_PAD_CTL_PAD_EIM_AD10 = 0x020E0450, + IOMUXC_SW_PAD_CTL_PAD_EIM_AD11 = 0x020E0454, + IOMUXC_SW_PAD_CTL_PAD_EIM_AD12 = 0x020E0458, + IOMUXC_SW_PAD_CTL_PAD_EIM_AD13 = 0x020E045C, + IOMUXC_SW_PAD_CTL_PAD_EIM_AD14 = 0x020E0460, + IOMUXC_SW_PAD_CTL_PAD_EIM_AD15 = 0x020E0464, + IOMUXC_SW_PAD_CTL_PAD_EIM_WAIT_B = 0x020E0468, + IOMUXC_SW_PAD_CTL_PAD_EIM_BCLK = 0x020E046C, + + CCM_CCGR6 = 0x020C4080, + + EIM_CS0GCR1 = 0x021B8000, + EIM_CS0GCR2 = 0x021B8004, + EIM_CS0RCR1 = 0x021B8008, + EIM_CS0RCR2 = 0x021B800C, + EIM_CS0WCR1 = 0x021B8010, + EIM_CS0WCR2 = 0x021B8014, + + EIM_WCR = 0x021B8090, + EIM_WIAR = 0x021B8094, + EIM_EAR = 0x021B8098, +}; + + +//------------------------------------------------------------------------------ +// Structures +//------------------------------------------------------------------------------ +struct IOMUXC_SW_MUX_CTL_PAD_EIM +{ + unsigned int mux_mode : 3; + unsigned int reserved_3 : 1; + unsigned int sion : 1; + unsigned int reserved_31_5 : 27; +}; + +struct IOMUXC_SW_PAD_CTL_PAD_EIM +{ + unsigned int sre : 1; + unsigned int reserved_2_1 : 2; + unsigned int dse : 3; + unsigned int speed : 2; + unsigned int reserved_10_8 : 3; + unsigned int ode : 1; + unsigned int pke : 1; + unsigned int pue : 1; + unsigned int pus : 2; + unsigned int hys : 1; + unsigned int reserved_31_17 : 15; +}; + +struct CCM_CCGR6 +{ + unsigned int cg0_usboh3 : 2; + unsigned int cg1_usdhc1 : 2; + unsigned int cg2_usdhc2 : 2; + unsigned int cg3_usdhc3 : 2; + + unsigned int cg3_usdhc4 : 2; + unsigned int cg5_eim_slow : 2; + unsigned int cg6_vdoaxiclk : 2; + unsigned int cg7_vpu : 2; + + unsigned int cg8_reserved : 2; + unsigned int cg9_reserved : 2; + unsigned int cg10_reserved : 2; + unsigned int cg11_reserved : 2; + + unsigned int cg12_reserved : 2; + unsigned int cg13_reserved : 2; + unsigned int cg14_reserved : 2; + unsigned int cg15_reserved : 2; +}; + +struct EIM_CS_GCR1 +{ + unsigned int csen : 1; + unsigned int swr : 1; + unsigned int srd : 1; + unsigned int mum : 1; + unsigned int wfl : 1; + unsigned int rfl : 1; + unsigned int cre : 1; + unsigned int crep : 1; + unsigned int bl : 3; + unsigned int wc : 1; + unsigned int bcd : 2; + unsigned int bcs : 2; + unsigned int dsz : 3; + unsigned int sp : 1; + unsigned int csrec : 3; + unsigned int aus : 1; + unsigned int gbc : 3; + unsigned int wp : 1; + unsigned int psz : 4; +}; + +struct EIM_CS_GCR2 +{ + unsigned int adh : 2; + unsigned int reserved_3_2 : 2; + unsigned int daps : 4; + unsigned int dae : 1; + unsigned int dap : 1; + unsigned int reserved_11_10 : 2; + unsigned int mux16_byp_grant : 1; + unsigned int reserved_31_13 : 19; +}; + +struct EIM_CS_RCR1 +{ + unsigned int rcsn : 3; + unsigned int reserved_3 : 1; + unsigned int rcsa : 3; + unsigned int reserved_7 : 1; + unsigned int oen : 3; + unsigned int reserved_11 : 1; + unsigned int oea : 3; + unsigned int reserved_15 : 1; + unsigned int radvn : 3; + unsigned int ral : 1; + unsigned int radva : 3; + unsigned int reserved_23 : 1; + unsigned int rwsc : 6; + unsigned int reserved_31_30 : 2; +}; + +struct EIM_CS_RCR2 +{ + unsigned int rben : 3; + unsigned int rbe : 1; + unsigned int rbea : 3; + unsigned int reserved_7 : 1; + unsigned int rl : 2; + unsigned int reserved_11_10 : 2; + unsigned int pat : 3; + unsigned int apr : 1; + unsigned int reserved_31_16 : 16; +}; + +struct EIM_CS_WCR1 +{ + unsigned int wcsn : 3; + unsigned int wcsa : 3; + unsigned int wen : 3; + unsigned int wea : 3; + unsigned int wben : 3; + unsigned int wbea : 3; + unsigned int wadvn : 3; + unsigned int wadva : 3; + unsigned int wwsc : 6; + unsigned int wbed : 1; + unsigned int wal : 1; +}; + +struct EIM_CS_WCR2 +{ + unsigned int wbcdd : 1; + unsigned int reserved_31_1 : 31; +}; + +struct EIM_WCR +{ + unsigned int bcm : 1; + unsigned int gbcd : 2; + unsigned int reserved_3 : 1; + unsigned int inten : 1; + unsigned int intpol : 1; + unsigned int reserved_7_6 : 2; + unsigned int wdog_en : 1; + unsigned int wdog_limit : 2; + unsigned int reserved_31_11 : 21; +}; + +struct EIM_WIAR +{ + unsigned int ips_req : 1; + unsigned int ips_ack : 1; + unsigned int irq : 1; + unsigned int errst : 1; + unsigned int aclk_en : 1; + unsigned int reserved_31_5 : 27; +}; + +struct EIM_EAR +{ + unsigned int error_addr : 32; +}; + + +//------------------------------------------------------------------------------ +// Variables +//------------------------------------------------------------------------------ +static long mem_page_size = 0; +static int mem_dev_fd = -1; +static void * mem_map_ptr = MAP_FAILED; +static off_t mem_base_addr = 0; + + +//------------------------------------------------------------------------------ +// Prototypes +//------------------------------------------------------------------------------ +static void _eim_setup_iomuxc (void); +static void _eim_setup_ccm (void); +static void _eim_setup_eim (void); +static void _eim_cleanup (void); +static off_t _eim_calc_offset (off_t); +static void _eim_remap_mem (off_t); + + +//------------------------------------------------------------------------------ +// Set up EIM bus. Returns 0 on success, -1 on failure. +//------------------------------------------------------------------------------ +int eim_setup(void) +{ + // register cleanup function + if (atexit(_eim_cleanup) != 0) { + fprintf(stderr, "ERROR: atexit() failed.\n"); + return -1; + } + + // determine memory page size to use in mmap() + mem_page_size = sysconf(_SC_PAGESIZE); + if (mem_page_size < 1) { + fprintf(stderr, "ERROR: sysconf(_SC_PAGESIZE) == %ld\n", mem_page_size); + return -1; + } + + // try to open memory device + mem_dev_fd = open(MEMORY_DEVICE, O_RDWR | O_SYNC); + if (mem_dev_fd == -1) { + fprintf(stderr, "ERROR: open(%s) failed.\n", MEMORY_DEVICE); + return -1; + } + + // configure IOMUXC + _eim_setup_iomuxc(); + + // configure Clock Controller Module + _eim_setup_ccm(); + + /* We need to properly configure EIM mode and all the corresponding parameters. + * That's a lot of code, let's do it now. + */ + _eim_setup_eim(); + + // done + return 0; +} + + +//------------------------------------------------------------------------------ +// Shut down EIM bus. This is called automatically on exit(). +//------------------------------------------------------------------------------ +static void _eim_cleanup(void) +{ + // unmap memory if needed + if (mem_map_ptr != MAP_FAILED) + if (munmap(mem_map_ptr, mem_page_size) != 0) + fprintf(stderr, "WARNING: munmap() failed.\n"); + + // close memory device if needed + if (mem_dev_fd != -1) + if (close(mem_dev_fd) != 0) + fprintf(stderr, "WARNING: close() failed.\n"); +} + + +//------------------------------------------------------------------------------ +// Several blocks in the CPU have common pins. We use the I/O MUX Controller +// to configure what block will actually use I/O pins. We wait for the EIM +// module to be able to communicate with the on-board FPGA. +//------------------------------------------------------------------------------ +static void _eim_setup_iomuxc(void) +{ + // create structures + struct IOMUXC_SW_MUX_CTL_PAD_EIM reg_mux; // mux control register + struct IOMUXC_SW_PAD_CTL_PAD_EIM reg_pad; // pad control register + + // setup mux control register + reg_mux.mux_mode = IOMUXC_MUX_MODE_ALT0; // ALT0 mode must be used for EIM + reg_mux.sion = 0; // forced input not needed + reg_mux.reserved_3 = 0; // must be 0 + reg_mux.reserved_31_5 = 0; // must be 0 + + // setup pad control register + reg_pad.sre = IOMUXC_PAD_CTL_SRE_FAST; // fast slew rate + reg_pad.dse = IOMUXC_PAD_CTL_DSE_33_OHM; // highest drive strength + reg_pad.speed = IOMUXC_PAD_CTL_SPEED_MEDIUM_10; // medium speed + reg_pad.ode = IOMUXC_PAD_CTL_ODE_DISABLED; // open drain not needed + reg_pad.pke = IOMUXC_PAD_CTL_PKE_DISABLED; // neither pull nor keeper are needed + reg_pad.pue = IOMUXC_PAD_CTL_PUE_PULL; // doesn't matter actually, because PKE is disabled + reg_pad.pus = IOMUXC_PAD_CTL_PUS_100K_OHM_PU; // doesn't matter actually, because PKE is disabled + reg_pad.hys = IOMUXC_PAD_CTL_HYS_DISABLED; // use CMOS, not Schmitt trigger input + reg_pad.reserved_2_1 = 0; // must be 0 + reg_pad.reserved_10_8 = 0; // must be 0 + reg_pad.reserved_31_17 = 0; // must be 0 + + // all the pins must be configured to use the same ALT0 mode + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_CS0_B, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_OE_B, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_RW, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_LBA_B, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_AD00, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_AD01, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_AD02, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_AD03, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_AD04, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_AD05, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_AD06, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_AD07, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_AD08, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_AD09, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_AD10, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_AD11, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_AD12, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_AD13, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_AD14, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_AD15, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_WAIT_B, (uint32_t *)®_mux); + eim_write_32(IOMUXC_SW_MUX_CTL_PAD_EIM_BCLK, (uint32_t *)®_mux); + + // we need to configure all the I/O pads too + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_CS0_B, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_OE_B, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_RW, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_LBA_B, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_AD00, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_AD01, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_AD02, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_AD03, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_AD04, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_AD05, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_AD06, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_AD07, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_AD08, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_AD09, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_AD10, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_AD11, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_AD12, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_AD13, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_AD14, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_AD15, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_WAIT_B, (uint32_t *)®_pad); + eim_write_32(IOMUXC_SW_PAD_CTL_PAD_EIM_BCLK, (uint32_t *)®_pad); +} + + +//------------------------------------------------------------------------------ +// Configure Clock Controller Module to enable clocking of EIM block. +//------------------------------------------------------------------------------ +static void _eim_setup_ccm(void) +{ + // create structure + struct CCM_CCGR6 ccm_ccgr6; + + // read register + eim_read_32(CCM_CCGR6, (uint32_t *)&ccm_ccgr6); + + // modify register + ccm_ccgr6.cg0_usboh3 = CCM_CGR_ON_EXCEPT_STOP; + ccm_ccgr6.cg1_usdhc1 = CCM_CGR_OFF; + ccm_ccgr6.cg2_usdhc2 = CCM_CGR_ON_EXCEPT_STOP; + ccm_ccgr6.cg3_usdhc3 = CCM_CGR_ON_EXCEPT_STOP; + + ccm_ccgr6.cg3_usdhc4 = CCM_CGR_OFF; + ccm_ccgr6.cg5_eim_slow = CCM_CGR_ON_EXCEPT_STOP; + ccm_ccgr6.cg6_vdoaxiclk = CCM_CGR_OFF; + ccm_ccgr6.cg7_vpu = CCM_CGR_OFF; + + ccm_ccgr6.cg8_reserved = 0; + ccm_ccgr6.cg9_reserved = 0; + ccm_ccgr6.cg10_reserved = 0; + ccm_ccgr6.cg11_reserved = 0; + ccm_ccgr6.cg12_reserved = 0; + ccm_ccgr6.cg13_reserved = 0; + ccm_ccgr6.cg14_reserved = 0; + ccm_ccgr6.cg15_reserved = 0; + + // write register + eim_write_32(CCM_CCGR6, (uint32_t *)&ccm_ccgr6); +} + + +//------------------------------------------------------------------------------ +// Configure EIM mode and all the corresponding parameters. That's a lot of code. +//------------------------------------------------------------------------------ +static void _eim_setup_eim(void) +{ + // create structures + struct EIM_CS_GCR1 gcr1; + struct EIM_CS_GCR2 gcr2; + struct EIM_CS_RCR1 rcr1; + struct EIM_CS_RCR2 rcr2; + struct EIM_CS_WCR1 wcr1; + struct EIM_CS_WCR2 wcr2; + + struct EIM_WCR wcr; + struct EIM_WIAR wiar; + struct EIM_EAR ear; + + // read all the registers + eim_read_32(EIM_CS0GCR1, (uint32_t *)&gcr1); + eim_read_32(EIM_CS0GCR2, (uint32_t *)&gcr2); + eim_read_32(EIM_CS0RCR1, (uint32_t *)&rcr1); + eim_read_32(EIM_CS0RCR2, (uint32_t *)&rcr2); + eim_read_32(EIM_CS0WCR1, (uint32_t *)&wcr1); + eim_read_32(EIM_CS0WCR2, (uint32_t *)&wcr2); + + eim_read_32(EIM_WCR, (uint32_t *)&wcr); + eim_read_32(EIM_WIAR, (uint32_t *)&wiar); + eim_read_32(EIM_EAR, (uint32_t *)&ear); + + // manipulate registers as needed + gcr1.csen = 1; // chip select is enabled + gcr1.swr = 1; // write is sync + gcr1.srd = 1; // read is sync + gcr1.mum = 1; // address and data are multiplexed + gcr1.wfl = 0; // write latency is not fixed + gcr1.rfl = 0; // read latency is not fixed + gcr1.cre = 0; // CRE signal not needed + //gcr1.crep = x; // don't care, CRE not used + gcr1.bl = 4; // burst length + gcr1.wc = 0; // write is not continuous + gcr1.bcd = 3; // BCLK divisor is 3+1=4 + gcr1.bcs = 1; // delay from ~CS to BCLK is 1 cycle + gcr1.dsz = 1; // 16 bits per databeat at DATA[15:0] + gcr1.sp = 0; // supervisor protection is disabled + gcr1.csrec = 1; // ~CS recovery is 1 cycle + gcr1.aus = 1; // address is not shifted + gcr1.gbc = 1; // ~CS gap is 1 cycle + gcr1.wp = 0; // write protection is not enabled + //gcr1.psz = x; // don't care, page mode is not used + + gcr2.adh = 0; // address hold duration is 1 cycle + //gcr2.daps = x; // don't care, DTACK is not used + gcr2.dae = 0; // DTACK is not used + //gcr2.dap = x; // don't care, DTACK is not used + gcr2.mux16_byp_grant= 1; // enable grant mechanism + gcr2.reserved_3_2 = 0; // must be 0 + gcr2.reserved_11_10 = 0; // must be 0 + gcr2.reserved_31_13 = 0; // must be 0 + + //rcr1.rcsn = x; // don't care in sync mode + rcr1.rcsa = 0; // no delay for ~CS needed + //rcr1.oen = x; // don't care in sync mode + rcr1.oea = 0; // no delay for ~OE needed + rcr1.radvn = 0; // no delay for ~LBA needed + rcr1.ral = 0; // clear ~LBA when needed + rcr1.radva = 0; // no delay for ~LBA needed + rcr1.rwsc = 1; // one wait state + rcr1.reserved_3 = 0; // must be 0 + rcr1.reserved_7 = 0; // must be 0 + rcr1.reserved_11 = 0; // must be 0 + rcr1.reserved_15 = 0; // must be 0 + rcr1.reserved_23 = 0; // must be 0 + rcr1.reserved_31_30 = 0; // must be 0 + + //rcr2.rben = x; // don't care in sync mode + rcr2.rbe = 0; // BE is disabled + //rcr2.rbea = x; // don't care when BE is not used + rcr2.rl = 0; // read latency is 0 + //rcr2.pat = x; // don't care when page read is not used + rcr2.apr = 0; // page read mode is not used + rcr2.reserved_7 = 0; // must be 0 + rcr2.reserved_11_10 = 0; // must be 0 + rcr2.reserved_31_16 = 0; // must be 0 + + //wcr1.wcsn = x; // don't care in sync mode + wcr1.wcsa = 0; // no delay for ~CS needed + //wcr1.wen = x; // don't care in sync mode + wcr1.wea = 0; // no delay for ~WR_N needed + //wcr1.wben = x; // don't care in sync mode + //wcr1.wbea = x; // don't care in sync mode + wcr1.wadvn = 0; // no delay for ~LBA needed + wcr1.wadva = 0; // no delay for ~LBA needed + wcr1.wwsc = 1; // no wait state in needed + wcr1.wbed = 1; // BE is disabled + wcr1.wal = 0; // clear ~LBA when needed + + wcr2.wbcdd = 0; // write clock division is not needed + wcr2.reserved_31_1 = 0; // must be 0 + + wcr.bcm = 0; // clock is only active during access + //wcr.gbcd = x; // don't care when BCM=0 + wcr.inten = 0; // interrupt is not used + //wcr.intpol = x; // don't care when interrupt is not used + wcr.wdog_en = 1; // watchdog is enabled + wcr.wdog_limit = 00; // timeout is 128 BCLK cycles + wcr.reserved_3 = 0; // must be 0 + wcr.reserved_7_6 = 0; // must be 0 + wcr.reserved_31_11 = 0; // must be 0 + + wiar.ips_req = 0; // IPS not needed + wiar.ips_ack = 0; // IPS not needed + //wiar.irq = x; // don't touch + //wiar.errst = x; // don't touch + wiar.aclk_en = 1; // clock is enabled + wiar.reserved_31_5 = 0; // must be 0 + + //ear.error_addr = x; // read-only + + // write modified registers + eim_write_32(EIM_CS0GCR1, (uint32_t *)&gcr1); + eim_write_32(EIM_CS0GCR2, (uint32_t *)&gcr2); + eim_write_32(EIM_CS0RCR1, (uint32_t *)&rcr1); + eim_write_32(EIM_CS0RCR2, (uint32_t *)&rcr2); + eim_write_32(EIM_CS0WCR1, (uint32_t *)&wcr1); + eim_write_32(EIM_CS0WCR2, (uint32_t *)&wcr2); + eim_write_32(EIM_WCR, (uint32_t *)&wcr); + eim_write_32(EIM_WIAR, (uint32_t *)&wiar); +/* eim_write_32(EIM_EAR, (uint32_t *)&ear);*/ +} + + +//------------------------------------------------------------------------------ +// Write a 32-bit word to EIM. +// If EIM is not set up correctly, this will abort with a bus error. +//------------------------------------------------------------------------------ +void eim_write_32(off_t offset, uint32_t *pvalue) +{ + // calculate memory offset + uint32_t *ptr = (uint32_t *)_eim_calc_offset(offset); + + // write data to memory + memcpy(ptr, pvalue, sizeof(uint32_t)); +} + +//------------------------------------------------------------------------------ +// Read a 32-bit word from EIM. +// If EIM is not set up correctly, this will abort with a bus error. +//------------------------------------------------------------------------------ +void eim_read_32(off_t offset, uint32_t *pvalue) +{ + // calculate memory offset + uint32_t *ptr = (uint32_t *)_eim_calc_offset(offset); + + // read data from memory + memcpy(pvalue, ptr, sizeof(uint32_t)); +} + + +//------------------------------------------------------------------------------ +// Calculate an offset into the currently-mapped EIM page. +//------------------------------------------------------------------------------ +static off_t _eim_calc_offset(off_t offset) +{ + // make sure that memory is mapped + if (mem_map_ptr == MAP_FAILED) + _eim_remap_mem(offset); + + // calculate starting and ending addresses of currently mapped page + off_t offset_low = mem_base_addr; + off_t offset_high = mem_base_addr + (mem_page_size - 1); + + // check that offset is in currently mapped page, remap new page otherwise + if ((offset < offset_low) || (offset > offset_high)) + _eim_remap_mem(offset); + + // calculate pointer + return (off_t)mem_map_ptr + (offset - mem_base_addr); +} + + +//------------------------------------------------------------------------------ +// Map in a new EIM page. +//------------------------------------------------------------------------------ +static void _eim_remap_mem(off_t offset) +{ + // unmap old memory page if needed + if (mem_map_ptr != MAP_FAILED) { + if (munmap(mem_map_ptr, mem_page_size) != 0) { + fprintf(stderr, "ERROR: munmap() failed.\n"); + exit(EXIT_FAILURE); + } + } + + // calculate starting address of new page + while (offset % mem_page_size) + offset--; + + // try to map new memory page + mem_map_ptr = mmap(NULL, mem_page_size, PROT_READ | PROT_WRITE, MAP_SHARED, + mem_dev_fd, offset); + if (mem_map_ptr == MAP_FAILED) { + fprintf(stderr, "ERROR: mmap() failed.\n"); + exit(EXIT_FAILURE); + } + + // save last mapped page address + mem_base_addr = offset; +} + + +//------------------------------------------------------------------------------ +// End-of-File +//------------------------------------------------------------------------------ -- cgit v1.2.3