1 // SPDX-License-Identifier: GPL-2.0+
4 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
5 * Marius Groeger <mgroeger@sysgo.de>
8 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
9 * Alex Zuepke <azu@sysgo.de>
15 #include <asm/arch/pxa-regs.h>
16 #include <asm/cache.h>
18 #include <asm/system.h>
22 static void cache_flush(void)
26 asm ("mcr p15, 0, %0, c7, c5, 0" : : "r" (i));
29 int cleanup_before_linux(void)
32 * This function is called just before we call Linux. It prepares
33 * the processor for Linux by just disabling everything that can
34 * disturb booting Linux.
45 inline void writelrb(uint32_t val, uint32_t addr)
48 asm volatile("" : : : "memory");
50 asm volatile("" : : : "memory");
53 void pxa2xx_dram_init(void)
58 * 1) Initialize Asynchronous static memory controller
61 writelrb(CONFIG_SYS_MSC0_VAL, MSC0);
62 writelrb(CONFIG_SYS_MSC1_VAL, MSC1);
63 writelrb(CONFIG_SYS_MSC2_VAL, MSC2);
65 * 2) Initialize Card Interface
68 /* MECR: Memory Expansion Card Register */
69 writelrb(CONFIG_SYS_MECR_VAL, MECR);
70 /* MCMEM0: Card Interface slot 0 timing */
71 writelrb(CONFIG_SYS_MCMEM0_VAL, MCMEM0);
72 /* MCMEM1: Card Interface slot 1 timing */
73 writelrb(CONFIG_SYS_MCMEM1_VAL, MCMEM1);
74 /* MCATT0: Card Interface Attribute Space Timing, slot 0 */
75 writelrb(CONFIG_SYS_MCATT0_VAL, MCATT0);
76 /* MCATT1: Card Interface Attribute Space Timing, slot 1 */
77 writelrb(CONFIG_SYS_MCATT1_VAL, MCATT1);
78 /* MCIO0: Card Interface I/O Space Timing, slot 0 */
79 writelrb(CONFIG_SYS_MCIO0_VAL, MCIO0);
80 /* MCIO1: Card Interface I/O Space Timing, slot 1 */
81 writelrb(CONFIG_SYS_MCIO1_VAL, MCIO1);
84 * 3) Configure Fly-By DMA register
87 writelrb(CONFIG_SYS_FLYCNFG_VAL, FLYCNFG);
90 * 4) Initialize Timing for Sync Memory (SDCLK0)
94 * Before accessing MDREFR we need a valid DRI field, so we set
95 * this to power on defaults + DRI field.
98 /* Read current MDREFR config and zero out DRI */
99 tmp = readl(MDREFR) & ~0xfff;
100 /* Add user-specified DRI */
101 tmp |= CONFIG_SYS_MDREFR_VAL & 0xfff;
102 /* Configure important bits */
103 tmp |= MDREFR_K0RUN | MDREFR_SLFRSH;
104 tmp &= ~(MDREFR_APD | MDREFR_E1PIN);
106 /* Write MDREFR back */
107 writelrb(tmp, MDREFR);
110 * 5) Initialize Synchronous Static Memory (Flash/Peripherals)
113 /* Initialize SXCNFG register. Assert the enable bits.
115 * Write SXMRS to cause an MRS command to all enabled banks of
116 * synchronous static memory. Note that SXLCR need not be written
119 writelrb(CONFIG_SYS_SXCNFG_VAL, SXCNFG);
122 * 6) Initialize SDRAM
125 writelrb(CONFIG_SYS_MDREFR_VAL & ~MDREFR_SLFRSH, MDREFR);
126 writelrb(CONFIG_SYS_MDREFR_VAL | MDREFR_E1PIN, MDREFR);
129 * 7) Write MDCNFG with MDCNFG:DEx deasserted (set to 0), to configure
130 * but not enable each SDRAM partition pair.
133 writelrb(CONFIG_SYS_MDCNFG_VAL &
134 ~(MDCNFG_DE0 | MDCNFG_DE1 | MDCNFG_DE2 | MDCNFG_DE3), MDCNFG);
136 /* Wait for the clock to the SDRAMs to stabilize, 100..200 usec. */
138 while (readl(OSCR) < 0x300)
139 asm volatile("" : : : "memory");
142 * 8) Trigger a number (usually 8) refresh cycles by attempting
143 * non-burst read or write accesses to disabled SDRAM, as commonly
144 * specified in the power up sequence documented in SDRAM data
145 * sheets. The address(es) used for this purpose must not be
148 for (i = 9; i >= 0; i--) {
149 writel(i, 0xa0000000);
150 asm volatile("" : : : "memory");
153 * 9) Write MDCNFG with enable bits asserted (MDCNFG:DEx set to 1).
156 tmp = CONFIG_SYS_MDCNFG_VAL &
157 (MDCNFG_DE0 | MDCNFG_DE1 | MDCNFG_DE2 | MDCNFG_DE3);
158 tmp |= readl(MDCNFG);
159 writelrb(tmp, MDCNFG);
165 writelrb(CONFIG_SYS_MDMRS_VAL, MDMRS);
171 if (CONFIG_SYS_MDREFR_VAL & MDREFR_APD) {
174 writelrb(tmp, MDREFR);
178 void pxa_gpio_setup(void)
180 writel(CONFIG_SYS_GPSR0_VAL, GPSR0);
181 writel(CONFIG_SYS_GPSR1_VAL, GPSR1);
182 writel(CONFIG_SYS_GPSR2_VAL, GPSR2);
183 #if defined(CONFIG_CPU_PXA27X)
184 writel(CONFIG_SYS_GPSR3_VAL, GPSR3);
187 writel(CONFIG_SYS_GPCR0_VAL, GPCR0);
188 writel(CONFIG_SYS_GPCR1_VAL, GPCR1);
189 writel(CONFIG_SYS_GPCR2_VAL, GPCR2);
190 #if defined(CONFIG_CPU_PXA27X)
191 writel(CONFIG_SYS_GPCR3_VAL, GPCR3);
194 writel(CONFIG_SYS_GPDR0_VAL, GPDR0);
195 writel(CONFIG_SYS_GPDR1_VAL, GPDR1);
196 writel(CONFIG_SYS_GPDR2_VAL, GPDR2);
197 #if defined(CONFIG_CPU_PXA27X)
198 writel(CONFIG_SYS_GPDR3_VAL, GPDR3);
201 writel(CONFIG_SYS_GAFR0_L_VAL, GAFR0_L);
202 writel(CONFIG_SYS_GAFR0_U_VAL, GAFR0_U);
203 writel(CONFIG_SYS_GAFR1_L_VAL, GAFR1_L);
204 writel(CONFIG_SYS_GAFR1_U_VAL, GAFR1_U);
205 writel(CONFIG_SYS_GAFR2_L_VAL, GAFR2_L);
206 writel(CONFIG_SYS_GAFR2_U_VAL, GAFR2_U);
207 #if defined(CONFIG_CPU_PXA27X)
208 writel(CONFIG_SYS_GAFR3_L_VAL, GAFR3_L);
209 writel(CONFIG_SYS_GAFR3_U_VAL, GAFR3_U);
212 writel(CONFIG_SYS_PSSR_VAL, PSSR);
215 void pxa_interrupt_setup(void)
219 #if defined(CONFIG_CPU_PXA27X)
225 void pxa_clock_setup(void)
227 writel(CONFIG_SYS_CKEN, CKEN);
228 writel(CONFIG_SYS_CCCR, CCCR);
229 asm volatile("mcr p14, 0, %0, c6, c0, 0" : : "r"(0x0b));
231 /* enable the 32Khz oscillator for RTC and PowerManager */
232 writel(OSCC_OON, OSCC);
233 while (!(readl(OSCC) & OSCC_OOK))
234 asm volatile("" : : : "memory");
237 void pxa_wakeup(void)
242 writel(rcsr & (RCSR_GPR | RCSR_SMR | RCSR_WDR | RCSR_HWR), RCSR);
245 if (rcsr & RCSR_SMR) {
246 writel(PSSR_PH, PSSR);
250 asm volatile("mov pc, %0" : : "r"(readl(PSPR)));
254 int arch_cpu_init(void)
258 pxa_interrupt_setup();
263 void i2c_clk_enable(void)
265 /* Set the global I2C clock on */
266 writel(readl(CKEN) | CKEN14_I2C, CKEN);
269 void __attribute__((weak)) reset_cpu(ulong ignored) __attribute__((noreturn));
271 void reset_cpu(ulong ignored)
275 setbits_le32(OWER, OWER_WME);
280 writel(MDREFR_SLFRSH, MDREFR);
286 void enable_caches(void)
288 #if !CONFIG_IS_ENABLED(SYS_ICACHE_OFF)
291 #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)