]> git.kernelconcepts.de Git - karo-tx-uboot.git/blob - drivers/mmc/s5p_sdhci.c
ARM: at91sam9m10g45ek: add mmc environment configuration support
[karo-tx-uboot.git] / drivers / mmc / s5p_sdhci.c
1 /*
2  * (C) Copyright 2012 SAMSUNG Electronics
3  * Jaehoon Chung <jh80.chung@samsung.com>
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
6  */
7
8 #include <common.h>
9 #include <malloc.h>
10 #include <sdhci.h>
11 #include <fdtdec.h>
12 #include <libfdt.h>
13 #include <asm/gpio.h>
14 #include <asm/arch/mmc.h>
15 #include <asm/arch/clk.h>
16 #include <errno.h>
17 #ifdef CONFIG_OF_CONTROL
18 #include <asm/arch/pinmux.h>
19 #endif
20
21 static char *S5P_NAME = "SAMSUNG SDHCI";
22 static void s5p_sdhci_set_control_reg(struct sdhci_host *host)
23 {
24         unsigned long val, ctrl;
25         /*
26          * SELCLKPADDS[17:16]
27          * 00 = 2mA
28          * 01 = 4mA
29          * 10 = 7mA
30          * 11 = 9mA
31          */
32         sdhci_writel(host, SDHCI_CTRL4_DRIVE_MASK(0x3), SDHCI_CONTROL4);
33
34         val = sdhci_readl(host, SDHCI_CONTROL2);
35         val &= SDHCI_CTRL2_SELBASECLK_SHIFT;
36
37         val |=  SDHCI_CTRL2_ENSTAASYNCCLR |
38                 SDHCI_CTRL2_ENCMDCNFMSK |
39                 SDHCI_CTRL2_ENFBCLKRX |
40                 SDHCI_CTRL2_ENCLKOUTHOLD;
41
42         sdhci_writel(host, val, SDHCI_CONTROL2);
43
44         /*
45          * FCSEL3[31] FCSEL2[23] FCSEL1[15] FCSEL0[7]
46          * FCSel[1:0] : Rx Feedback Clock Delay Control
47          *      Inverter delay means10ns delay if SDCLK 50MHz setting
48          *      01 = Delay1 (basic delay)
49          *      11 = Delay2 (basic delay + 2ns)
50          *      00 = Delay3 (inverter delay)
51          *      10 = Delay4 (inverter delay + 2ns)
52          */
53         val = SDHCI_CTRL3_FCSEL0 | SDHCI_CTRL3_FCSEL1;
54         sdhci_writel(host, val, SDHCI_CONTROL3);
55
56         /*
57          * SELBASECLK[5:4]
58          * 00/01 = HCLK
59          * 10 = EPLL
60          * 11 = XTI or XEXTCLK
61          */
62         ctrl = sdhci_readl(host, SDHCI_CONTROL2);
63         ctrl &= ~SDHCI_CTRL2_SELBASECLK_MASK(0x3);
64         ctrl |= SDHCI_CTRL2_SELBASECLK_MASK(0x2);
65         sdhci_writel(host, ctrl, SDHCI_CONTROL2);
66 }
67
68 int s5p_sdhci_init(u32 regbase, int index, int bus_width)
69 {
70         struct sdhci_host *host = NULL;
71         host = (struct sdhci_host *)malloc(sizeof(struct sdhci_host));
72         if (!host) {
73                 printf("sdhci__host malloc fail!\n");
74                 return 1;
75         }
76
77         host->name = S5P_NAME;
78         host->ioaddr = (void *)regbase;
79
80         host->quirks = SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_BROKEN_VOLTAGE |
81                 SDHCI_QUIRK_BROKEN_R1B | SDHCI_QUIRK_32BIT_DMA_ADDR |
82                 SDHCI_QUIRK_WAIT_SEND_CMD | SDHCI_QUIRK_USE_WIDE8;
83         host->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
84         host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
85
86         host->set_control_reg = &s5p_sdhci_set_control_reg;
87         host->set_clock = set_mmc_clk;
88         host->index = index;
89
90         host->host_caps = MMC_MODE_HC;
91         if (bus_width == 8)
92                 host->host_caps |= MMC_MODE_8BIT;
93
94         return add_sdhci(host, 52000000, 400000);
95 }
96
97 #ifdef CONFIG_OF_CONTROL
98 struct sdhci_host sdhci_host[SDHCI_MAX_HOSTS];
99
100 static int do_sdhci_init(struct sdhci_host *host)
101 {
102         int dev_id, flag;
103         int err = 0;
104
105         flag = host->bus_width == 8 ? PINMUX_FLAG_8BIT_MODE : PINMUX_FLAG_NONE;
106         dev_id = host->index + PERIPH_ID_SDMMC0;
107
108         if (fdt_gpio_isvalid(&host->pwr_gpio)) {
109                 gpio_direction_output(host->pwr_gpio.gpio, 1);
110                 err = exynos_pinmux_config(dev_id, flag);
111                 if (err) {
112                         debug("MMC not configured\n");
113                         return err;
114                 }
115         }
116
117         if (fdt_gpio_isvalid(&host->cd_gpio)) {
118                 gpio_direction_output(host->cd_gpio.gpio, 0xf);
119                 if (gpio_get_value(host->cd_gpio.gpio))
120                         return -ENODEV;
121
122                 err = exynos_pinmux_config(dev_id, flag);
123                 if (err) {
124                         printf("external SD not configured\n");
125                         return err;
126                 }
127         }
128
129         host->name = S5P_NAME;
130
131         host->quirks = SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_BROKEN_VOLTAGE |
132                 SDHCI_QUIRK_BROKEN_R1B | SDHCI_QUIRK_32BIT_DMA_ADDR |
133                 SDHCI_QUIRK_WAIT_SEND_CMD;
134         host->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
135         host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
136
137         host->set_control_reg = &s5p_sdhci_set_control_reg;
138         host->set_clock = set_mmc_clk;
139
140         host->host_caps = MMC_MODE_HC;
141
142         return add_sdhci(host, 52000000, 400000);
143 }
144
145 static int sdhci_get_config(const void *blob, int node, struct sdhci_host *host)
146 {
147         int bus_width, dev_id;
148         unsigned int base;
149
150         /* Get device id */
151         dev_id = pinmux_decode_periph_id(blob, node);
152         if (dev_id < PERIPH_ID_SDMMC0 && dev_id > PERIPH_ID_SDMMC3) {
153                 debug("MMC: Can't get device id\n");
154                 return -1;
155         }
156         host->index = dev_id - PERIPH_ID_SDMMC0;
157
158         /* Get bus width */
159         bus_width = fdtdec_get_int(blob, node, "samsung,bus-width", 0);
160         if (bus_width <= 0) {
161                 debug("MMC: Can't get bus-width\n");
162                 return -1;
163         }
164         host->bus_width = bus_width;
165
166         /* Get the base address from the device node */
167         base = fdtdec_get_addr(blob, node, "reg");
168         if (!base) {
169                 debug("MMC: Can't get base address\n");
170                 return -1;
171         }
172         host->ioaddr = (void *)base;
173
174         fdtdec_decode_gpio(blob, node, "pwr-gpios", &host->pwr_gpio);
175         fdtdec_decode_gpio(blob, node, "cd-gpios", &host->cd_gpio);
176
177         return 0;
178 }
179
180 static int process_nodes(const void *blob, int node_list[], int count)
181 {
182         struct sdhci_host *host;
183         int i, node;
184
185         debug("%s: count = %d\n", __func__, count);
186
187         /* build sdhci_host[] for each controller */
188         for (i = 0; i < count; i++) {
189                 node = node_list[i];
190                 if (node <= 0)
191                         continue;
192
193                 host = &sdhci_host[i];
194
195                 if (sdhci_get_config(blob, node, host)) {
196                         printf("%s: failed to decode dev %d\n", __func__, i);
197                         return -1;
198                 }
199                 do_sdhci_init(host);
200         }
201         return 0;
202 }
203
204 int exynos_mmc_init(const void *blob)
205 {
206         int count;
207         int node_list[SDHCI_MAX_HOSTS];
208
209         count = fdtdec_find_aliases_for_id(blob, "mmc",
210                         COMPAT_SAMSUNG_EXYNOS_MMC, node_list,
211                         SDHCI_MAX_HOSTS);
212
213         process_nodes(blob, node_list, count);
214
215         return 1;
216 }
217 #endif