| Łukasz Majewski | e542b7f | 2011-10-06 02:37:34 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2011 Samsung Electronics |
| 3 | * Lukasz Majewski <l.majewski@samsung.com> |
| 4 | * |
| 5 | * (C) Copyright 2010 |
| 6 | * Stefano Babic, DENX Software Engineering, sbabic@denx.de |
| 7 | * |
| 8 | * (C) Copyright 2008-2009 Freescale Semiconductor, Inc. |
| 9 | * |
| 10 | * See file CREDITS for list of people who contributed to this |
| 11 | * project. |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or |
| 14 | * modify it under the terms of the GNU General Public License as |
| 15 | * published by the Free Software Foundation; either version 2 of |
| 16 | * the License, or (at your option) any later version. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | * GNU General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public License |
| 24 | * along with this program; if not, write to the Free Software |
| 25 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 26 | * MA 02111-1307 USA |
| 27 | */ |
| 28 | |
| 29 | #include <common.h> |
| 30 | #include <linux/types.h> |
| 31 | #include <pmic.h> |
| 32 | #include <spi.h> |
| 33 | |
| 34 | static struct spi_slave *slave; |
| 35 | |
| 36 | void pmic_spi_free(struct spi_slave *slave) |
| 37 | { |
| 38 | if (slave) |
| 39 | spi_free_slave(slave); |
| 40 | } |
| 41 | |
| 42 | struct spi_slave *pmic_spi_probe(struct pmic *p) |
| 43 | { |
| 44 | return spi_setup_slave(p->bus, |
| 45 | p->hw.spi.cs, |
| 46 | p->hw.spi.clk, |
| 47 | p->hw.spi.mode); |
| 48 | } |
| 49 | |
| 50 | static u32 pmic_reg(struct pmic *p, u32 reg, u32 *val, u32 write) |
| 51 | { |
| 52 | u32 pmic_tx, pmic_rx; |
| 53 | u32 tmp; |
| 54 | |
| 55 | if (!slave) { |
| 56 | slave = pmic_spi_probe(p); |
| 57 | |
| 58 | if (!slave) |
| 59 | return -1; |
| 60 | } |
| 61 | |
| 62 | if (check_reg(reg)) |
| 63 | return -1; |
| 64 | |
| 65 | if (spi_claim_bus(slave)) |
| 66 | return -1; |
| 67 | |
| 68 | pmic_tx = p->hw.spi.prepare_tx(reg, val, write); |
| 69 | |
| 70 | tmp = cpu_to_be32(pmic_tx); |
| 71 | |
| 72 | if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx, |
| 73 | pmic_spi_flags)) { |
| 74 | spi_release_bus(slave); |
| 75 | return -1; |
| 76 | } |
| 77 | |
| 78 | if (write) { |
| 79 | pmic_tx = p->hw.spi.prepare_tx(0, NULL, write); |
| 80 | pmic_tx &= ~(1 << 31); |
| 81 | tmp = cpu_to_be32(pmic_tx); |
| 82 | if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx, |
| 83 | pmic_spi_flags)) { |
| 84 | spi_release_bus(slave); |
| 85 | return -1; |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | spi_release_bus(slave); |
| 90 | *val = cpu_to_be32(pmic_rx); |
| 91 | |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | int pmic_reg_write(struct pmic *p, u32 reg, u32 val) |
| 96 | { |
| 97 | if (pmic_reg(p, reg, &val, 1)) |
| 98 | return -1; |
| 99 | |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | int pmic_reg_read(struct pmic *p, u32 reg, u32 *val) |
| 104 | { |
| 105 | if (pmic_reg(p, reg, val, 0)) |
| 106 | return -1; |
| 107 | |
| 108 | return 0; |
| 109 | } |