diff options
Diffstat (limited to 'cpu/bf537/init_sdram.S')
| -rw-r--r-- | cpu/bf537/init_sdram.S | 178 |
1 files changed, 0 insertions, 178 deletions
diff --git a/cpu/bf537/init_sdram.S b/cpu/bf537/init_sdram.S deleted file mode 100644 index e997500..0000000 --- a/cpu/bf537/init_sdram.S +++ /dev/null @@ -1,178 +0,0 @@ -#define ASSEMBLY - -#include <linux/config.h> -#include <config.h> -#include <asm/blackfin.h> -#include <asm/mem_init.h> -#include <asm/mach-common/bits/bootrom.h> -#include <asm/mach-common/bits/ebiu.h> -#include <asm/mach-common/bits/pll.h> -#include <asm/mach-common/bits/uart.h> -.global init_sdram; - -#if (BFIN_BOOT_MODE != BF537_UART_BOOT) -#if (CONFIG_CCLK_DIV == 1) -#define CONFIG_CCLK_ACT_DIV CCLK_DIV1 -#endif -#if (CONFIG_CCLK_DIV == 2) -#define CONFIG_CCLK_ACT_DIV CCLK_DIV2 -#endif -#if (CONFIG_CCLK_DIV == 4) -#define CONFIG_CCLK_ACT_DIV CCLK_DIV4 -#endif -#if (CONFIG_CCLK_DIV == 8) -#define CONFIG_CCLK_ACT_DIV CCLK_DIV8 -#endif -#ifndef CONFIG_CCLK_ACT_DIV -#define CONFIG_CCLK_ACT_DIV CONFIG_CCLK_DIV_not_defined_properly -#endif -#endif - -init_sdram: - [--SP] = ASTAT; - [--SP] = RETS; - [--SP] = (R7:0); - [--SP] = (P5:0); - -#if (BFIN_BOOT_MODE == BF537_SPI_MASTER_BOOT) - p0.h = hi(SIC_IWR); - p0.l = lo(SIC_IWR); - r0.l = 0x1; - w[p0] = r0.l; - SSYNC; - - p0.h = hi(SPI_BAUD); - p0.l = lo(SPI_BAUD); - r0.l = CONFIG_SPI_BAUD; - w[p0] = r0.l; - SSYNC; -#endif - -#if (BFIN_BOOT_MODE != BF537_UART_BOOT) - -#ifdef CONFIG_BF537 - /* Enable PHY CLK buffer output */ - p0.h = hi(VR_CTL); - p0.l = lo(VR_CTL); - r0.l = w[p0]; - bitset(r0, 14); - w[p0] = r0.l; - ssync; -#endif - /* - * PLL_LOCKCNT - how many SCLK Cycles to delay while PLL becomes stable - */ - p0.h = hi(PLL_LOCKCNT); - p0.l = lo(PLL_LOCKCNT); - r0 = 0x300(Z); - w[p0] = r0.l; - ssync; - - /* - * Put SDRAM in self-refresh, incase anything is running - */ - P2.H = hi(EBIU_SDGCTL); - P2.L = lo(EBIU_SDGCTL); - R0 = [P2]; - BITSET (R0, 24); - [P2] = R0; - SSYNC; - - /* - * Set PLL_CTL with the value that we calculate in R0 - * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors - * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK - * - [7] = output delay (add 200ps of delay to mem signals) - * - [6] = input delay (add 200ps of input delay to mem signals) - * - [5] = PDWN : 1=All Clocks off - * - [3] = STOPCK : 1=Core Clock off - * - [1] = PLL_OFF : 1=Disable Power to PLL - * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL - * all other bits set to zero - */ - - r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */ - r0 = r0 << 9; /* Shift it over */ - r1 = CONFIG_CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/ - r0 = r1 | r0; - r1 = CONFIG_PLL_BYPASS; /* Bypass the PLL? */ - r1 = r1 << 8; /* Shift it over */ - r0 = r1 | r0; /* add them all together */ - - p0.h = hi(PLL_CTL); - p0.l = lo(PLL_CTL); /* Load the address */ - cli r2; /* Disable interrupts */ - ssync; - w[p0] = r0.l; /* Set the value */ - idle; /* Wait for the PLL to stablize */ - sti r2; /* Enable interrupts */ - -check_again: - p0.h = hi(PLL_STAT); - p0.l = lo(PLL_STAT); - R0 = W[P0](Z); - CC = BITTST(R0,5); - if ! CC jump check_again; - - /* Configure SCLK & CCLK Dividers */ - r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV); - p0.h = hi(PLL_DIV); - p0.l = lo(PLL_DIV); - w[p0] = r0.l; - ssync; -#endif - - /* - * Now, Initialize the SDRAM, - * start with the SDRAM Refresh Rate Control Register - */ - p0.l = lo(EBIU_SDRRC); - p0.h = hi(EBIU_SDRRC); - r0 = mem_SDRRC; - w[p0] = r0.l; - ssync; - - /* - * SDRAM Memory Bank Control Register - bank specific parameters - */ - p0.l = (EBIU_SDBCTL & 0xFFFF); - p0.h = (EBIU_SDBCTL >> 16); - r0 = mem_SDBCTL; - w[p0] = r0.l; - ssync; - - /* - * SDRAM Global Control Register - global programmable parameters - * Disable self-refresh - */ - P2.H = hi(EBIU_SDGCTL); - P2.L = lo(EBIU_SDGCTL); - R0 = [P2]; - BITCLR (R0, 24); - - /* - * Check if SDRAM is already powered up, if it is, enable self-refresh - */ - p0.h = hi(EBIU_SDSTAT); - p0.l = lo(EBIU_SDSTAT); - r2.l = w[p0]; - cc = bittst(r2,3); - if !cc jump skip; - NOP; - BITSET (R0, 23); -skip: - [P2] = R0; - SSYNC; - - /* Write in the new value in the register */ - R0.L = lo(mem_SDGCTL); - R0.H = hi(mem_SDGCTL); - [P2] = R0; - SSYNC; - nop; - - (P5:0) = [SP++]; - (R7:0) = [SP++]; - RETS = [SP++]; - ASTAT = [SP++]; - RTS; |