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8203b201ea
The computation was not correct with low clock values: setting a 1MHz clock would result in an overlap that would then configure a 25Mhz clock. This patch implements a correct computation method according to the kirkwood functionnal spec. table 600 (Serial Memory Interface Configuration Register). Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com> cc: Holger Brunck <holger.brunck@keymile.com> cc: Prafulla Wadaskar <prafulla@marvell.com> Acked-by: Prafulla Wadaskar <Prafulla@marvell.com> Signed-off-by: Prafulla Wadaskar <prafulla@marvell.com>
68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
/*
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* (C) Copyright 2009
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* Marvell Semiconductor <www.marvell.com>
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* Written-by: Prafulla Wadaskar <prafulla@marvell.com>
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*
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* Derived from drivers/spi/mpc8xxx_spi.c
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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., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#ifndef __KW_SPI_H__
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#define __KW_SPI_H__
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/* SPI Registers on kirkwood SOC */
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struct kwspi_registers {
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u32 ctrl; /* 0x10600 */
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u32 cfg; /* 0x10604 */
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u32 dout; /* 0x10608 */
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u32 din; /* 0x1060c */
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u32 irq_cause; /* 0x10610 */
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u32 irq_mask; /* 0x10614 */
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};
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/* They are used to define CONFIG_SYS_KW_SPI_MPP
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* each of the below #defines selects which mpp is
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* configured for each SPI signal in spi_claim_bus
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* bit 0: selects pin for MOSI (MPP1 if 0, MPP6 if 1)
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* bit 1: selects pin for SCK (MPP2 if 0, MPP10 if 1)
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* bit 2: selects pin for MISO (MPP3 if 0, MPP11 if 1)
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*/
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#define MOSI_MPP6 (1 << 0)
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#define SCK_MPP10 (1 << 1)
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#define MISO_MPP11 (1 << 2)
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#define KWSPI_CLKPRESCL_MASK 0x1f
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#define KWSPI_CLKPRESCL_MIN 0x12
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#define KWSPI_CSN_ACT 1 /* Activates serial memory interface */
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#define KWSPI_SMEMRDY (1 << 1) /* SerMem Data xfer ready */
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#define KWSPI_IRQUNMASK 1 /* unmask SPI interrupt */
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#define KWSPI_IRQMASK 0 /* mask SPI interrupt */
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#define KWSPI_SMEMRDIRQ 1 /* SerMem data xfer ready irq */
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#define KWSPI_XFERLEN_1BYTE 0
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#define KWSPI_XFERLEN_2BYTE (1 << 5)
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#define KWSPI_XFERLEN_MASK (1 << 5)
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#define KWSPI_ADRLEN_1BYTE 0
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#define KWSPI_ADRLEN_2BYTE 1 << 8
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#define KWSPI_ADRLEN_3BYTE 2 << 8
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#define KWSPI_ADRLEN_4BYTE 3 << 8
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#define KWSPI_ADRLEN_MASK 3 << 8
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#define KWSPI_TIMEOUT 10000
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#endif /* __KW_SPI_H__ */
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