162 lines
4.9 KiB
C
162 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2014 Angelo Dureghello <angelo@sysam.it>
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*
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*/
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#include <common.h>
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#include <cpu_func.h>
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#include <init.h>
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#include <watchdog.h>
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#include <asm/immap.h>
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#include <asm/io.h>
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#if defined(CONFIG_M5307)
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/*
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* Simple mcf5307 chip select module init.
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*
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* Note: this chip has an issue reported in the device "errata":
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* MCF5307ER Rev 4.2 reports @ section 35:
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* Corrupted Return PC in Exception Stack Frame
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* When processing an autovectored interrupt an error can occur that
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* causes 0xFFFFFFFF to be written as the return PC value in the
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* exception stack frame. The problem is caused by a conflict between
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* an internal autovector access and a chip select mapped to the IACK
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* address space (0xFFFFXXXX).
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* Workaround:
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* Set the C/I bit in the chip select mask register (CSMR) for the
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* chip select that is mapped to 0xFFFFXXXX.
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* This will prevent the chip select from asserting for IACK accesses.
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*/
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#define MCF5307_SP_ERR_FIX(cs_base, mask) \
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do { \
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if (((cs_base<<16)+(in_be32(&mask)&0xffff0000)) >= \
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0xffff0000) \
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setbits_be32(&mask, CSMR_CI); \
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} while (0)
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void init_csm(void)
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{
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csm_t *csm = (csm_t *)(MMAP_CSM);
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#if (defined(CONFIG_SYS_CS0_BASE) && defined(CONFIG_SYS_CS0_MASK) && \
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defined(CONFIG_SYS_CS0_CTRL))
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out_be16(&csm->csar0, CONFIG_SYS_CS0_BASE);
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out_be32(&csm->csmr0, CONFIG_SYS_CS0_MASK);
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out_be16(&csm->cscr0, CONFIG_SYS_CS0_CTRL);
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MCF5307_SP_ERR_FIX(CONFIG_SYS_CS0_BASE, csm->csmr0);
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#else
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#warning "Chip Select 0 are not initialized/used"
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#endif
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#if (defined(CONFIG_SYS_CS1_BASE) && defined(CONFIG_SYS_CS1_MASK) && \
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defined(CONFIG_SYS_CS1_CTRL))
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out_be16(&csm->csar1, CONFIG_SYS_CS1_BASE);
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out_be32(&csm->csmr1, CONFIG_SYS_CS1_MASK);
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out_be16(&csm->cscr1, CONFIG_SYS_CS1_CTRL);
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MCF5307_SP_ERR_FIX(CONFIG_SYS_CS1_BASE, csm->csmr1);
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#endif
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#if (defined(CONFIG_SYS_CS2_BASE) && defined(CONFIG_SYS_CS2_MASK) && \
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defined(CONFIG_SYS_CS2_CTRL))
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out_be16(&csm->csar2, CONFIG_SYS_CS2_BASE);
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out_be32(&csm->csmr2, CONFIG_SYS_CS2_MASK);
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out_be16(&csm->cscr2, CONFIG_SYS_CS2_CTRL);
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MCF5307_SP_ERR_FIX(CONFIG_SYS_CS2_BASE, csm->csmr2);
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#endif
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#if (defined(CONFIG_SYS_CS3_BASE) && defined(CONFIG_SYS_CS3_MASK) && \
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defined(CONFIG_SYS_CS3_CTRL))
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out_be16(&csm->csar3, CONFIG_SYS_CS3_BASE);
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out_be32(&csm->csmr3, CONFIG_SYS_CS3_MASK);
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out_be16(&csm->cscr3, CONFIG_SYS_CS3_CTRL);
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MCF5307_SP_ERR_FIX(CONFIG_SYS_CS3_BASE, csm->csmr3);
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#endif
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#if (defined(CONFIG_SYS_CS4_BASE) && defined(CONFIG_SYS_CS4_MASK) && \
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defined(CONFIG_SYS_CS4_CTRL))
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out_be16(&csm->csar4, CONFIG_SYS_CS4_BASE);
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out_be32(&csm->csmr4, CONFIG_SYS_CS4_MASK);
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out_be16(&csm->cscr4, CONFIG_SYS_CS4_CTRL);
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MCF5307_SP_ERR_FIX(CONFIG_SYS_CS4_BASE, csm->csmr4);
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#endif
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#if (defined(CONFIG_SYS_CS5_BASE) && defined(CONFIG_SYS_CS5_MASK) && \
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defined(CONFIG_SYS_CS5_CTRL))
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out_be16(&csm->csar5, CONFIG_SYS_CS5_BASE);
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out_be32(&csm->csmr5, CONFIG_SYS_CS5_MASK);
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out_be16(&csm->cscr5, CONFIG_SYS_CS5_CTRL);
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MCF5307_SP_ERR_FIX(CONFIG_SYS_CS5_BASE, csm->csmr5);
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#endif
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#if (defined(CONFIG_SYS_CS6_BASE) && defined(CONFIG_SYS_CS6_MASK) && \
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defined(CONFIG_SYS_CS6_CTRL))
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out_be16(&csm->csar6, CONFIG_SYS_CS6_BASE);
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out_be32(&csm->csmr6, CONFIG_SYS_CS6_MASK);
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out_be16(&csm->cscr6, CONFIG_SYS_CS6_CTRL);
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MCF5307_SP_ERR_FIX(CONFIG_SYS_CS6_BASE, csm->csmr6);
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#endif
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#if (defined(CONFIG_SYS_CS7_BASE) && defined(CONFIG_SYS_CS7_MASK) && \
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defined(CONFIG_SYS_CS7_CTRL))
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out_be16(&csm->csar7, CONFIG_SYS_CS7_BASE);
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out_be32(&csm->csmr7, CONFIG_SYS_CS7_MASK);
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out_be16(&csm->cscr7, CONFIG_SYS_CS7_CTRL);
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MCF5307_SP_ERR_FIX(CONFIG_SYS_CS7_BASE, csm->csmr7);
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#endif
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}
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/*
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* Set up the memory map and initialize registers
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*/
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void cpu_init_f(void)
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{
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sim_t *sim = (sim_t *)(MMAP_SIM);
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out_8(&sim->sypcr, 0x00);
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out_8(&sim->swivr, 0x0f);
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out_8(&sim->swsr, 0x00);
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out_8(&sim->mpark, 0x00);
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intctrl_t *icr = (intctrl_t *)(MMAP_INTC);
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/* timer 2 not masked */
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out_be32(&icr->imr, 0xfffffbff);
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out_8(&icr->icr0, 0x00); /* sw watchdog */
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out_8(&icr->icr1, 0x00); /* timer 1 */
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out_8(&icr->icr2, 0x88); /* timer 2 */
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out_8(&icr->icr3, 0x00); /* i2c */
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out_8(&icr->icr4, 0x00); /* uart 0 */
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out_8(&icr->icr5, 0x00); /* uart 1 */
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out_8(&icr->icr6, 0x00); /* dma 0 */
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out_8(&icr->icr7, 0x00); /* dma 1 */
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out_8(&icr->icr8, 0x00); /* dma 2 */
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out_8(&icr->icr9, 0x00); /* dma 3 */
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/* Chipselect Init */
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init_csm();
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/* enable data/instruction cache now */
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icache_enable();
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}
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/*
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* initialize higher level parts of CPU like timers
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*/
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int cpu_init_r(void)
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{
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return 0;
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}
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void uart_port_conf(int port)
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{
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}
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void arch_preboot_os(void)
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{
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/*
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* OS can change interrupt offsets and are about to boot the OS so
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* we need to make sure we disable all async interrupts.
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*/
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intctrl_t *icr = (intctrl_t *)(MMAP_INTC);
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out_8(&icr->icr1, 0x00); /* timer 1 */
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out_8(&icr->icr2, 0x00); /* timer 2 */
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}
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#endif
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