1 /*
2 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
3 */
4
5 /*
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 */
20
21 #include <linux/io.h>
22 #include <linux/clk.h>
23 #include <linux/err.h>
24 #include <linux/device.h>
25 #include <linux/dma-mapping.h>
26 #include <asm/sizes.h>
27 #include <mach/hardware.h>
28 #include <mach/devices-common.h>
29
30 #define imx_ahci_imx_data_entry_single(soc, _devid) \
31 { \
32 .devid = _devid, \
33 .iobase = soc ## _SATA_BASE_ADDR, \
34 .irq = soc ## _INT_SATA, \
35 }
36
37 #ifdef CONFIG_SOC_IMX53
38 const struct imx_ahci_imx_data imx53_ahci_imx_data __initconst =
39 imx_ahci_imx_data_entry_single(MX53, "imx53-ahci");
40 #endif
41
42 enum {
43 HOST_CAP = 0x00,
44 HOST_CAP_SSS = (1 << 27), /* Staggered Spin-up */
45 HOST_PORTS_IMPL = 0x0c,
46 HOST_TIMER1MS = 0xe0, /* Timer 1-ms */
47 };
48
49 static struct clk *sata_clk, *sata_ref_clk;
50
51 /* AHCI module Initialization, if return 0, initialization is successful. */
imx_sata_init(struct device * dev,void __iomem * addr)52 static int imx_sata_init(struct device *dev, void __iomem *addr)
53 {
54 u32 tmpdata;
55 int ret = 0;
56 struct clk *clk;
57
58 sata_clk = clk_get(dev, "ahci");
59 if (IS_ERR(sata_clk)) {
60 dev_err(dev, "no sata clock.\n");
61 return PTR_ERR(sata_clk);
62 }
63 ret = clk_prepare_enable(sata_clk);
64 if (ret) {
65 dev_err(dev, "can't prepare/enable sata clock.\n");
66 goto put_sata_clk;
67 }
68
69 /* Get the AHCI SATA PHY CLK */
70 sata_ref_clk = clk_get(dev, "ahci_phy");
71 if (IS_ERR(sata_ref_clk)) {
72 dev_err(dev, "no sata ref clock.\n");
73 ret = PTR_ERR(sata_ref_clk);
74 goto release_sata_clk;
75 }
76 ret = clk_prepare_enable(sata_ref_clk);
77 if (ret) {
78 dev_err(dev, "can't prepare/enable sata ref clock.\n");
79 goto put_sata_ref_clk;
80 }
81
82 /* Get the AHB clock rate, and configure the TIMER1MS reg later */
83 clk = clk_get(dev, "ahci_dma");
84 if (IS_ERR(clk)) {
85 dev_err(dev, "no dma clock.\n");
86 ret = PTR_ERR(clk);
87 goto release_sata_ref_clk;
88 }
89 tmpdata = clk_get_rate(clk) / 1000;
90 clk_put(clk);
91
92 writel(tmpdata, addr + HOST_TIMER1MS);
93
94 tmpdata = readl(addr + HOST_CAP);
95 if (!(tmpdata & HOST_CAP_SSS)) {
96 tmpdata |= HOST_CAP_SSS;
97 writel(tmpdata, addr + HOST_CAP);
98 }
99
100 if (!(readl(addr + HOST_PORTS_IMPL) & 0x1))
101 writel((readl(addr + HOST_PORTS_IMPL) | 0x1),
102 addr + HOST_PORTS_IMPL);
103
104 return 0;
105
106 release_sata_ref_clk:
107 clk_disable_unprepare(sata_ref_clk);
108 put_sata_ref_clk:
109 clk_put(sata_ref_clk);
110 release_sata_clk:
111 clk_disable_unprepare(sata_clk);
112 put_sata_clk:
113 clk_put(sata_clk);
114
115 return ret;
116 }
117
imx_sata_exit(struct device * dev)118 static void imx_sata_exit(struct device *dev)
119 {
120 clk_disable_unprepare(sata_ref_clk);
121 clk_put(sata_ref_clk);
122
123 clk_disable_unprepare(sata_clk);
124 clk_put(sata_clk);
125
126 }
imx_add_ahci_imx(const struct imx_ahci_imx_data * data,const struct ahci_platform_data * pdata)127 struct platform_device *__init imx_add_ahci_imx(
128 const struct imx_ahci_imx_data *data,
129 const struct ahci_platform_data *pdata)
130 {
131 struct resource res[] = {
132 {
133 .start = data->iobase,
134 .end = data->iobase + SZ_4K - 1,
135 .flags = IORESOURCE_MEM,
136 }, {
137 .start = data->irq,
138 .end = data->irq,
139 .flags = IORESOURCE_IRQ,
140 },
141 };
142
143 return imx_add_platform_device_dmamask(data->devid, 0,
144 res, ARRAY_SIZE(res),
145 pdata, sizeof(*pdata), DMA_BIT_MASK(32));
146 }
147
imx53_add_ahci_imx(void)148 struct platform_device *__init imx53_add_ahci_imx(void)
149 {
150 struct ahci_platform_data pdata = {
151 .init = imx_sata_init,
152 .exit = imx_sata_exit,
153 };
154
155 return imx_add_ahci_imx(&imx53_ahci_imx_data, &pdata);
156 }
157