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Stephen Warren9a4fbe42013-01-29 16:37:41 +00001/*
2 * This code was extracted from:
3 * git://github.com/gonzoua/u-boot-pi.git master
4 * and hence presumably (C) 2012 Oleksandr Tymoshenko
5 *
6 * Tweaks for U-Boot upstreaming
7 * (C) 2012 Stephen Warren
8 *
9 * Portions (e.g. read/write macros, concepts for back-to-back register write
10 * timing workarounds) obviously extracted from the Linux kernel at:
11 * https://github.com/raspberrypi/linux.git rpi-3.6.y
12 *
13 * The Linux kernel code has the following (c) and license, which is hence
14 * propagated to Oleksandr's tree and here:
15 *
16 * Support for SDHCI device on 2835
17 * Based on sdhci-bcm2708.c (c) 2010 Broadcom
18 *
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License version 2 as
21 * published by the Free Software Foundation.
22 *
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
27 *
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
31 */
32
33/* Supports:
34 * SDHCI platform device - Arasan SD controller in BCM2708
35 *
36 * Inspired by sdhci-pci.c, by Pierre Ossman
37 */
38
39#include <common.h>
Simon Glasse6c6d072017-04-05 16:23:38 -060040#include <dm.h>
Stephen Warren9a4fbe42013-01-29 16:37:41 +000041#include <malloc.h>
Simon Glasse6c6d072017-04-05 16:23:38 -060042#include <memalign.h>
Stephen Warren9a4fbe42013-01-29 16:37:41 +000043#include <sdhci.h>
Simon Glasse6c6d072017-04-05 16:23:38 -060044#include <asm/arch/msg.h>
45#include <asm/arch/mbox.h>
Masahiro Yamadad6c418e2015-03-19 19:42:57 +090046#include <mach/sdhci.h>
Simon Glasse6c6d072017-04-05 16:23:38 -060047#include <mach/timer.h>
Stephen Warren9a4fbe42013-01-29 16:37:41 +000048
49/* 400KHz is max freq for card ID etc. Use that as min */
50#define MIN_FREQ 400000
Jocelyn Bohr4db2b612017-04-02 01:24:33 -070051#define SDHCI_BUFFER 0x20
Stephen Warren9a4fbe42013-01-29 16:37:41 +000052
Simon Glasse6c6d072017-04-05 16:23:38 -060053struct bcm2835_sdhci_plat {
54 struct mmc_config cfg;
55 struct mmc mmc;
56};
57
Stephen Warren9a4fbe42013-01-29 16:37:41 +000058struct bcm2835_sdhci_host {
59 struct sdhci_host host;
60 uint twoticks_delay;
61 ulong last_write;
62};
63
64static inline struct bcm2835_sdhci_host *to_bcm(struct sdhci_host *host)
65{
66 return (struct bcm2835_sdhci_host *)host;
67}
68
69static inline void bcm2835_sdhci_raw_writel(struct sdhci_host *host, u32 val,
Simon Glasse6c6d072017-04-05 16:23:38 -060070 int reg)
Stephen Warren9a4fbe42013-01-29 16:37:41 +000071{
72 struct bcm2835_sdhci_host *bcm_host = to_bcm(host);
73
74 /*
75 * The Arasan has a bugette whereby it may lose the content of
76 * successive writes to registers that are within two SD-card clock
77 * cycles of each other (a clock domain crossing problem).
78 * It seems, however, that the data register does not have this problem.
79 * (Which is just as well - otherwise we'd have to nobble the DMA engine
80 * too)
81 */
Jocelyn Bohr4db2b612017-04-02 01:24:33 -070082 if (reg != SDHCI_BUFFER) {
83 while (timer_get_us() - bcm_host->last_write <
84 bcm_host->twoticks_delay)
85 ;
86 }
Stephen Warren9a4fbe42013-01-29 16:37:41 +000087
88 writel(val, host->ioaddr + reg);
Marek Vasut9f1b4452015-06-19 23:39:41 +020089 bcm_host->last_write = timer_get_us();
Stephen Warren9a4fbe42013-01-29 16:37:41 +000090}
91
92static inline u32 bcm2835_sdhci_raw_readl(struct sdhci_host *host, int reg)
93{
94 return readl(host->ioaddr + reg);
95}
96
97static void bcm2835_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
98{
99 bcm2835_sdhci_raw_writel(host, val, reg);
100}
101
102static void bcm2835_sdhci_writew(struct sdhci_host *host, u16 val, int reg)
103{
104 static u32 shadow;
105 u32 oldval = (reg == SDHCI_COMMAND) ? shadow :
106 bcm2835_sdhci_raw_readl(host, reg & ~3);
107 u32 word_num = (reg >> 1) & 1;
108 u32 word_shift = word_num * 16;
109 u32 mask = 0xffff << word_shift;
110 u32 newval = (oldval & ~mask) | (val << word_shift);
111
112 if (reg == SDHCI_TRANSFER_MODE)
113 shadow = newval;
114 else
115 bcm2835_sdhci_raw_writel(host, newval, reg & ~3);
116}
117
118static void bcm2835_sdhci_writeb(struct sdhci_host *host, u8 val, int reg)
119{
120 u32 oldval = bcm2835_sdhci_raw_readl(host, reg & ~3);
121 u32 byte_num = reg & 3;
122 u32 byte_shift = byte_num * 8;
123 u32 mask = 0xff << byte_shift;
124 u32 newval = (oldval & ~mask) | (val << byte_shift);
125
126 bcm2835_sdhci_raw_writel(host, newval, reg & ~3);
127}
128
129static u32 bcm2835_sdhci_readl(struct sdhci_host *host, int reg)
130{
131 u32 val = bcm2835_sdhci_raw_readl(host, reg);
132
133 return val;
134}
135
136static u16 bcm2835_sdhci_readw(struct sdhci_host *host, int reg)
137{
138 u32 val = bcm2835_sdhci_raw_readl(host, (reg & ~3));
139 u32 word_num = (reg >> 1) & 1;
140 u32 word_shift = word_num * 16;
141 u32 word = (val >> word_shift) & 0xffff;
142
143 return word;
144}
145
146static u8 bcm2835_sdhci_readb(struct sdhci_host *host, int reg)
147{
148 u32 val = bcm2835_sdhci_raw_readl(host, (reg & ~3));
149 u32 byte_num = reg & 3;
150 u32 byte_shift = byte_num * 8;
151 u32 byte = (val >> byte_shift) & 0xff;
152
153 return byte;
154}
155
156static const struct sdhci_ops bcm2835_ops = {
157 .write_l = bcm2835_sdhci_writel,
158 .write_w = bcm2835_sdhci_writew,
159 .write_b = bcm2835_sdhci_writeb,
160 .read_l = bcm2835_sdhci_readl,
161 .read_w = bcm2835_sdhci_readw,
162 .read_b = bcm2835_sdhci_readb,
163};
164
Simon Glasse6c6d072017-04-05 16:23:38 -0600165static int bcm2835_sdhci_bind(struct udevice *dev)
Stephen Warren9a4fbe42013-01-29 16:37:41 +0000166{
Simon Glasse6c6d072017-04-05 16:23:38 -0600167 struct bcm2835_sdhci_plat *plat = dev_get_platdata(dev);
Stephen Warren9a4fbe42013-01-29 16:37:41 +0000168
Simon Glasse6c6d072017-04-05 16:23:38 -0600169 return sdhci_bind(dev, &plat->mmc, &plat->cfg);
170}
171
172static int bcm2835_sdhci_probe(struct udevice *dev)
173{
174 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
175 struct bcm2835_sdhci_plat *plat = dev_get_platdata(dev);
176 struct bcm2835_sdhci_host *priv = dev_get_priv(dev);
177 struct sdhci_host *host = &priv->host;
178 fdt_addr_t base;
179 int emmc_freq;
180 int ret;
181
Simon Glassa821c4a2017-05-17 17:18:05 -0600182 base = devfdt_get_addr(dev);
Simon Glasse6c6d072017-04-05 16:23:38 -0600183 if (base == FDT_ADDR_T_NONE)
184 return -EINVAL;
185
186 ret = bcm2835_get_mmc_clock();
187 if (ret < 0) {
188 debug("%s: Failed to set MMC clock (err=%d)\n", __func__, ret);
189 return ret;
Stephen Warren9a4fbe42013-01-29 16:37:41 +0000190 }
Simon Glasse6c6d072017-04-05 16:23:38 -0600191 emmc_freq = ret;
Stephen Warren9a4fbe42013-01-29 16:37:41 +0000192
193 /*
194 * See the comments in bcm2835_sdhci_raw_writel().
195 *
196 * This should probably be dynamically calculated based on the actual
197 * frequency. However, this is the longest we'll have to wait, and
198 * doesn't seem to slow access down too much, so the added complexity
199 * doesn't seem worth it for now.
200 *
201 * 1/MIN_FREQ is (max) time per tick of eMMC clock.
202 * 2/MIN_FREQ is time for two ticks.
203 * Multiply by 1000000 to get uS per two ticks.
204 * +1 for hack rounding.
205 */
Simon Glasse6c6d072017-04-05 16:23:38 -0600206 priv->twoticks_delay = ((2 * 1000000) / MIN_FREQ) + 1;
207 priv->last_write = 0;
Stephen Warren9a4fbe42013-01-29 16:37:41 +0000208
Simon Glasse6c6d072017-04-05 16:23:38 -0600209 host->name = dev->name;
210 host->ioaddr = (void *)base;
Stephen Warren9a4fbe42013-01-29 16:37:41 +0000211 host->quirks = SDHCI_QUIRK_BROKEN_VOLTAGE | SDHCI_QUIRK_BROKEN_R1B |
Lubomir Rintel64973022014-06-10 20:46:43 +0200212 SDHCI_QUIRK_WAIT_SEND_CMD | SDHCI_QUIRK_NO_HISPD_BIT;
Stefan Herbrechtsmeier6d0e34b2017-01-17 15:58:48 +0100213 host->max_clk = emmc_freq;
Stephen Warren9a4fbe42013-01-29 16:37:41 +0000214 host->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
215 host->ops = &bcm2835_ops;
216
Simon Glasse6c6d072017-04-05 16:23:38 -0600217 ret = sdhci_setup_cfg(&plat->cfg, host, emmc_freq, MIN_FREQ);
218 if (ret) {
219 debug("%s: Failed to setup SDHCI (err=%d)\n", __func__, ret);
220 return ret;
221 }
Stephen Warren9a4fbe42013-01-29 16:37:41 +0000222
Simon Glasse6c6d072017-04-05 16:23:38 -0600223 upriv->mmc = &plat->mmc;
224 host->mmc = &plat->mmc;
225 host->mmc->priv = host;
226
227 return sdhci_probe(dev);
Stephen Warren9a4fbe42013-01-29 16:37:41 +0000228}
Simon Glasse6c6d072017-04-05 16:23:38 -0600229
230static const struct udevice_id bcm2835_sdhci_match[] = {
231 { .compatible = "brcm,bcm2835-sdhci" },
232 { /* sentinel */ }
233};
234
235U_BOOT_DRIVER(sdhci_cdns) = {
236 .name = "sdhci-bcm2835",
237 .id = UCLASS_MMC,
238 .of_match = bcm2835_sdhci_match,
239 .bind = bcm2835_sdhci_bind,
240 .probe = bcm2835_sdhci_probe,
241 .priv_auto_alloc_size = sizeof(struct bcm2835_sdhci_host),
242 .platdata_auto_alloc_size = sizeof(struct bcm2835_sdhci_plat),
243 .ops = &sdhci_ops,
244};