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![Timur Tabi](/assets/img/avatar_default.png)
Refactor and document the Freescale PIXIS code, used on most 85xx and 86xx boards. This makes the code easier to read and more flexible. Delete pixis.h, because none of the exported functions were actually being used by any other file. Make all of the functions in pixis.c 'static'. Remove "#include pixis.h" from every file that has it. Remove some unnecessary #includes. Make 'pixis_base' into a macro, so that we don't need to define it in every function. Add "while(1);" loops at the end of functions that reset the board, so that execution doesn't continue while the reset is in progress. Replace in_8/out_8 calls with clrbits_8, setbits_8, or clrsetbits_8, where appropriate. Replace ulong/uint with their spelled-out equivalents. Remove unnecessary typecasts, changing the types of some variables if necessary. Add CONFIG_SYS_PIXIS_VCFGEN0_ENABLE and CONFIG_SYS_PIXIS_VBOOT_ENABLE to make it easier for specific boards to support variations in the PIXIS registers sets. No current boards appears to need this feature. Fix the definition of CONFIG_SYS_PIXIS_VBOOT_MASK for the MPC8610 HPCD. Apparently, "pixis_reset altbank" has never worked on this board. Signed-off-by: Timur Tabi <timur@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
559 lines
12 KiB
C
559 lines
12 KiB
C
/*
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* Copyright 2006,2010 Freescale Semiconductor
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* Jeff Brown
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* Srikanth Srinivasan (srikanth.srinivasan@freescale.com)
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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#include <asm/io.h>
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#define pixis_base (u8 *)PIXIS_BASE
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/*
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* Simple board reset.
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*/
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void pixis_reset(void)
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{
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out_8(pixis_base + PIXIS_RST, 0);
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while (1);
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}
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/*
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* Per table 27, page 58 of MPC8641HPCN spec.
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*/
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static int set_px_sysclk(unsigned long sysclk)
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{
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u8 sysclk_s, sysclk_r, sysclk_v, vclkh, vclkl, sysclk_aux;
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switch (sysclk) {
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case 33:
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sysclk_s = 0x04;
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sysclk_r = 0x04;
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sysclk_v = 0x07;
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sysclk_aux = 0x00;
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break;
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case 40:
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sysclk_s = 0x01;
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sysclk_r = 0x1F;
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sysclk_v = 0x20;
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sysclk_aux = 0x01;
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break;
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case 50:
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sysclk_s = 0x01;
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sysclk_r = 0x1F;
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sysclk_v = 0x2A;
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sysclk_aux = 0x02;
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break;
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case 66:
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sysclk_s = 0x01;
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sysclk_r = 0x04;
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sysclk_v = 0x04;
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sysclk_aux = 0x03;
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break;
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case 83:
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sysclk_s = 0x01;
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sysclk_r = 0x1F;
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sysclk_v = 0x4B;
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sysclk_aux = 0x04;
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break;
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case 100:
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sysclk_s = 0x01;
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sysclk_r = 0x1F;
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sysclk_v = 0x5C;
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sysclk_aux = 0x05;
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break;
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case 134:
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sysclk_s = 0x06;
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sysclk_r = 0x1F;
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sysclk_v = 0x3B;
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sysclk_aux = 0x06;
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break;
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case 166:
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sysclk_s = 0x06;
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sysclk_r = 0x1F;
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sysclk_v = 0x4B;
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sysclk_aux = 0x07;
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break;
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default:
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printf("Unsupported SYSCLK frequency.\n");
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return 0;
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}
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vclkh = (sysclk_s << 5) | sysclk_r;
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vclkl = sysclk_v;
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out_8(pixis_base + PIXIS_VCLKH, vclkh);
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out_8(pixis_base + PIXIS_VCLKL, vclkl);
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out_8(pixis_base + PIXIS_AUX, sysclk_aux);
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return 1;
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}
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/* Set the CFG_SYSPLL bits
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*
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* This only has effect if PX_VCFGEN0[SYSPLL]=1, which is true if
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* read_from_px_regs() is called.
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*/
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static int set_px_mpxpll(unsigned long mpxpll)
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{
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switch (mpxpll) {
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case 2:
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case 4:
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case 6:
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case 8:
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case 10:
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case 12:
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case 14:
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case 16:
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clrsetbits_8(pixis_base + PIXIS_VSPEED1, 0x1F, mpxpll);
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return 1;
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}
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printf("Unsupported MPXPLL ratio.\n");
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return 0;
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}
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static int set_px_corepll(unsigned long corepll)
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{
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u8 val;
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switch (corepll) {
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case 20:
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val = 0x08;
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break;
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case 25:
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val = 0x0C;
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break;
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case 30:
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val = 0x10;
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break;
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case 35:
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val = 0x1C;
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break;
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case 40:
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val = 0x14;
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break;
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case 45:
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val = 0x0E;
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break;
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default:
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printf("Unsupported COREPLL ratio.\n");
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return 0;
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}
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clrsetbits_8(pixis_base + PIXIS_VSPEED0, 0x1F, val);
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return 1;
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}
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#ifndef CONFIG_SYS_PIXIS_VCFGEN0_ENABLE
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#define CONFIG_SYS_PIXIS_VCFGEN0_ENABLE 0x1C
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#endif
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/* Tell the PIXIS where to find the COREPLL, MPXPLL, SYSCLK values
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*
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* The PIXIS can be programmed to look at either the on-board dip switches
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* or various other PIXIS registers to determine the values for COREPLL,
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* MPXPLL, and SYSCLK.
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*
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* CONFIG_SYS_PIXIS_VCFGEN0_ENABLE is the value to write to the PIXIS_VCFGEN0
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* register that tells the pixis to use the various PIXIS register.
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*/
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static void read_from_px_regs(int set)
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{
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u8 tmp = in_8(pixis_base + PIXIS_VCFGEN0);
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if (set)
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tmp = tmp | CONFIG_SYS_PIXIS_VCFGEN0_ENABLE;
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else
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tmp = tmp & ~CONFIG_SYS_PIXIS_VCFGEN0_ENABLE;
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out_8(pixis_base + PIXIS_VCFGEN0, tmp);
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}
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/* CONFIG_SYS_PIXIS_VBOOT_ENABLE is the value to write to the PX_VCFGEN1
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* register that tells the pixis to use the PX_VBOOT[LBMAP] register.
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*/
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#ifndef CONFIG_SYS_PIXIS_VBOOT_ENABLE
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#define CONFIG_SYS_PIXIS_VBOOT_ENABLE 0x04
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#endif
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/* Configure the source of the boot location
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*
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* The PIXIS can be programmed to look at either the on-board dip switches
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* or the PX_VBOOT[LBMAP] register to determine where we should boot.
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*
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* If we want to boot from the alternate boot bank, we need to tell the PIXIS
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* to ignore the on-board dip switches and use the PX_VBOOT[LBMAP] instead.
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*/
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static void read_from_px_regs_altbank(int set)
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{
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u8 tmp = in_8(pixis_base + PIXIS_VCFGEN1);
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if (set)
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tmp = tmp | CONFIG_SYS_PIXIS_VBOOT_ENABLE;
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else
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tmp = tmp & ~CONFIG_SYS_PIXIS_VBOOT_ENABLE;
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out_8(pixis_base + PIXIS_VCFGEN1, tmp);
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}
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/* CONFIG_SYS_PIXIS_VBOOT_MASK contains the bits to set in VBOOT register that
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* tells the PIXIS what the alternate flash bank is.
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*
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* Note that it's not really a mask. It contains the actual LBMAP bits that
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* must be set to select the alternate bank. This code assumes that the
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* primary bank has these bits set to 0, and the alternate bank has these
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* bits set to 1.
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*/
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#ifndef CONFIG_SYS_PIXIS_VBOOT_MASK
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#define CONFIG_SYS_PIXIS_VBOOT_MASK (0x40)
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#endif
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/* Tell the PIXIS to boot from the default flash bank
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*
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* Program the default flash bank into the VBOOT register. This register is
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* used only if PX_VCFGEN1[FLASH]=1.
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*/
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static void clear_altbank(void)
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{
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clrbits_8(pixis_base + PIXIS_VBOOT, CONFIG_SYS_PIXIS_VBOOT_MASK);
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}
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/* Tell the PIXIS to boot from the alternate flash bank
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*
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* Program the alternate flash bank into the VBOOT register. This register is
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* used only if PX_VCFGEN1[FLASH]=1.
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*/
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static void set_altbank(void)
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{
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setbits_8(pixis_base + PIXIS_VBOOT, CONFIG_SYS_PIXIS_VBOOT_MASK);
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}
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/* Reset the board with watchdog disabled.
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*
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* This respects the altbank setting.
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*/
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static void set_px_go(void)
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{
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/* Disable the VELA sequencer and watchdog */
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clrbits_8(pixis_base + PIXIS_VCTL, 9);
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/* Reboot by starting the VELA sequencer */
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setbits_8(pixis_base + PIXIS_VCTL, 0x1);
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while (1);
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}
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/* Reset the board with watchdog enabled.
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*
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* This respects the altbank setting.
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*/
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static void set_px_go_with_watchdog(void)
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{
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/* Disable the VELA sequencer */
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clrbits_8(pixis_base + PIXIS_VCTL, 1);
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/* Enable the watchdog and reboot by starting the VELA sequencer */
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setbits_8(pixis_base + PIXIS_VCTL, 0x9);
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while (1);
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}
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/* Disable the watchdog
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*
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*/
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static int pixis_disable_watchdog_cmd(cmd_tbl_t *cmdtp, int flag, int argc,
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char *argv[])
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{
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/* Disable the VELA sequencer and the watchdog */
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clrbits_8(pixis_base + PIXIS_VCTL, 9);
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return 0;
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}
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U_BOOT_CMD(
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diswd, 1, 0, pixis_disable_watchdog_cmd,
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"Disable watchdog timer",
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""
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);
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#ifdef CONFIG_PIXIS_SGMII_CMD
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/* Enable or disable SGMII mode for a TSEC
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*/
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static int pixis_set_sgmii(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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int which_tsec = -1;
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unsigned char mask;
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unsigned char switch_mask;
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if ((argc > 2) && (strcmp(argv[1], "all") != 0))
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which_tsec = simple_strtoul(argv[1], NULL, 0);
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switch (which_tsec) {
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#ifdef CONFIG_TSEC1
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case 1:
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mask = PIXIS_VSPEED2_TSEC1SER;
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switch_mask = PIXIS_VCFGEN1_TSEC1SER;
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break;
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#endif
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#ifdef CONFIG_TSEC2
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case 2:
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mask = PIXIS_VSPEED2_TSEC2SER;
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switch_mask = PIXIS_VCFGEN1_TSEC2SER;
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break;
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#endif
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#ifdef CONFIG_TSEC3
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case 3:
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mask = PIXIS_VSPEED2_TSEC3SER;
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switch_mask = PIXIS_VCFGEN1_TSEC3SER;
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break;
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#endif
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#ifdef CONFIG_TSEC4
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case 4:
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mask = PIXIS_VSPEED2_TSEC4SER;
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switch_mask = PIXIS_VCFGEN1_TSEC4SER;
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break;
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#endif
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default:
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mask = PIXIS_VSPEED2_MASK;
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switch_mask = PIXIS_VCFGEN1_MASK;
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break;
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}
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/* Toggle whether the switches or FPGA control the settings */
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if (!strcmp(argv[argc - 1], "switch"))
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clrbits_8(pixis_base + PIXIS_VCFGEN1, switch_mask);
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else
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setbits_8(pixis_base + PIXIS_VCFGEN1, switch_mask);
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/* If it's not the switches, enable or disable SGMII, as specified */
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if (!strcmp(argv[argc - 1], "on"))
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clrbits_8(pixis_base + PIXIS_VSPEED2, mask);
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else if (!strcmp(argv[argc - 1], "off"))
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setbits_8(pixis_base + PIXIS_VSPEED2, mask);
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return 0;
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}
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U_BOOT_CMD(
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pixis_set_sgmii, CONFIG_SYS_MAXARGS, 1, pixis_set_sgmii,
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"pixis_set_sgmii"
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" - Enable or disable SGMII mode for a given TSEC \n",
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"\npixis_set_sgmii [TSEC num] <on|off|switch>\n"
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" TSEC num: 1,2,3,4 or 'all'. 'all' is default.\n"
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" on - enables SGMII\n"
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" off - disables SGMII\n"
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" switch - use switch settings"
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);
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#endif
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/*
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* This function takes the non-integral cpu:mpx pll ratio
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* and converts it to an integer that can be used to assign
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* FPGA register values.
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* input: strptr i.e. argv[2]
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*/
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static unsigned long strfractoint(char *strptr)
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{
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int i, j;
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int mulconst;
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int intarr_len, no_dec = 0;
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unsigned long intval = 0, decval = 0;
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char intarr[3], decarr[3];
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/* Assign the integer part to intarr[]
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* If there is no decimal point i.e.
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* if the ratio is an integral value
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* simply create the intarr.
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*/
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i = 0;
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while (strptr[i] != '.') {
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if (strptr[i] == 0) {
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no_dec = 1;
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break;
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}
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intarr[i] = strptr[i];
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i++;
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}
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/* Assign length of integer part to intarr_len. */
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intarr_len = i;
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intarr[i] = '\0';
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if (no_dec) {
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/* Currently needed only for single digit corepll ratios */
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mulconst = 10;
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decval = 0;
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} else {
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j = 0;
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i++; /* Skipping the decimal point */
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while ((strptr[i] >= '0') && (strptr[i] <= '9')) {
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decarr[j] = strptr[i];
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i++;
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j++;
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}
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decarr[j] = '\0';
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mulconst = 1;
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for (i = 0; i < j; i++)
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mulconst *= 10;
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decval = simple_strtoul(decarr, NULL, 10);
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}
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intval = simple_strtoul(intarr, NULL, 10);
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intval = intval * mulconst;
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return intval + decval;
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}
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static int pixis_reset_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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unsigned int i;
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char *p_cf = NULL;
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char *p_cf_sysclk = NULL;
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char *p_cf_corepll = NULL;
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char *p_cf_mpxpll = NULL;
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char *p_altbank = NULL;
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char *p_wd = NULL;
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int unknown_param = 0;
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/*
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* No args is a simple reset request.
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*/
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if (argc <= 1) {
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pixis_reset();
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/* not reached */
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}
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for (i = 1; i < argc; i++) {
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if (strcmp(argv[i], "cf") == 0) {
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p_cf = argv[i];
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if (i + 3 >= argc) {
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break;
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}
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p_cf_sysclk = argv[i+1];
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p_cf_corepll = argv[i+2];
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p_cf_mpxpll = argv[i+3];
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i += 3;
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continue;
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}
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if (strcmp(argv[i], "altbank") == 0) {
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p_altbank = argv[i];
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continue;
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}
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if (strcmp(argv[i], "wd") == 0) {
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p_wd = argv[i];
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continue;
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}
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unknown_param = 1;
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}
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/*
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* Check that cf has all required parms
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*/
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if ((p_cf && !(p_cf_sysclk && p_cf_corepll && p_cf_mpxpll))
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|| unknown_param) {
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#ifdef CONFIG_SYS_LONGHELP
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puts(cmdtp->help);
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#endif
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return 1;
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}
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/*
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* PIXIS seems to be sensitive to the ordering of
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* the registers that are touched.
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*/
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read_from_px_regs(0);
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if (p_altbank)
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read_from_px_regs_altbank(0);
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clear_altbank();
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/*
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* Clock configuration specified.
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*/
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if (p_cf) {
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unsigned long sysclk;
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unsigned long corepll;
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unsigned long mpxpll;
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sysclk = simple_strtoul(p_cf_sysclk, NULL, 10);
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corepll = strfractoint(p_cf_corepll);
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mpxpll = simple_strtoul(p_cf_mpxpll, NULL, 10);
|
|
|
|
if (!(set_px_sysclk(sysclk)
|
|
&& set_px_corepll(corepll)
|
|
&& set_px_mpxpll(mpxpll))) {
|
|
#ifdef CONFIG_SYS_LONGHELP
|
|
puts(cmdtp->help);
|
|
#endif
|
|
return 1;
|
|
}
|
|
read_from_px_regs(1);
|
|
}
|
|
|
|
/*
|
|
* Altbank specified
|
|
*
|
|
* NOTE CHANGE IN BEHAVIOR: previous code would default
|
|
* to enabling watchdog if altbank is specified.
|
|
* Now the watchdog must be enabled explicitly using 'wd'.
|
|
*/
|
|
if (p_altbank) {
|
|
set_altbank();
|
|
read_from_px_regs_altbank(1);
|
|
}
|
|
|
|
/*
|
|
* Reset with watchdog specified.
|
|
*/
|
|
if (p_wd)
|
|
set_px_go_with_watchdog();
|
|
else
|
|
set_px_go();
|
|
|
|
/*
|
|
* Shouldn't be reached.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
|
|
U_BOOT_CMD(
|
|
pixis_reset, CONFIG_SYS_MAXARGS, 1, pixis_reset_cmd,
|
|
"Reset the board using the FPGA sequencer",
|
|
" pixis_reset\n"
|
|
" pixis_reset [altbank]\n"
|
|
" pixis_reset altbank wd\n"
|
|
" pixis_reset altbank cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>\n"
|
|
" pixis_reset cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>"
|
|
);
|