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/*
* Copyright (c) 2014, The Linux foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License rev 2 and
* only rev 2 as published by the free Software foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or fITNESS fOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <dt-bindings/soc/qcom,gsbi.h>
#define GSBI_CTRL_REG 0x0000
#define GSBI_PROTOCOL_SHIFT 4
#define MAX_GSBI 12
#define TCSR_ADM_CRCI_BASE 0x70
struct crci_config {
u32 num_rows;
const u32 (*array)[MAX_GSBI];
};
static const u32 crci_ipq8064[][MAX_GSBI] = {
{
0x000003, 0x00000c, 0x000030, 0x0000c0,
0x000300, 0x000c00, 0x003000, 0x00c000,
0x030000, 0x0c0000, 0x300000, 0xc00000
},
{
0x000003, 0x00000c, 0x000030, 0x0000c0,
0x000300, 0x000c00, 0x003000, 0x00c000,
0x030000, 0x0c0000, 0x300000, 0xc00000
},
};
static const struct crci_config config_ipq8064 = {
.num_rows = ARRAY_SIZE(crci_ipq8064),
.array = crci_ipq8064,
};
static const unsigned int crci_apq8064[][MAX_GSBI] = {
{
0x001800, 0x006000, 0x000030, 0x0000c0,
0x000300, 0x000400, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000
},
{
0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000020, 0x0000c0, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000
},
};
static const struct crci_config config_apq8064 = {
.num_rows = ARRAY_SIZE(crci_apq8064),
.array = crci_apq8064,
};
static const unsigned int crci_msm8960[][MAX_GSBI] = {
{
0x000003, 0x00000c, 0x000030, 0x0000c0,
0x000300, 0x000400, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000
},
{
0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000020, 0x0000c0, 0x000300,
0x001800, 0x006000, 0x000000, 0x000000
},
};
static const struct crci_config config_msm8960 = {
.num_rows = ARRAY_SIZE(crci_msm8960),
.array = crci_msm8960,
};
static const unsigned int crci_msm8660[][MAX_GSBI] = {
{ /* ADM 0 - B */
0x000003, 0x00000c, 0x000030, 0x0000c0,
0x000300, 0x000c00, 0x003000, 0x00c000,
0x030000, 0x0c0000, 0x300000, 0xc00000
},
{ /* ADM 0 - B */
0x000003, 0x00000c, 0x000030, 0x0000c0,
0x000300, 0x000c00, 0x003000, 0x00c000,
0x030000, 0x0c0000, 0x300000, 0xc00000
},
{ /* ADM 1 - A */
0x000003, 0x00000c, 0x000030, 0x0000c0,
0x000300, 0x000c00, 0x003000, 0x00c000,
0x030000, 0x0c0000, 0x300000, 0xc00000
},
{ /* ADM 1 - B */
0x000003, 0x00000c, 0x000030, 0x0000c0,
0x000300, 0x000c00, 0x003000, 0x00c000,
0x030000, 0x0c0000, 0x300000, 0xc00000
},
};
static const struct crci_config config_msm8660 = {
.num_rows = ARRAY_SIZE(crci_msm8660),
.array = crci_msm8660,
};
struct gsbi_info {
struct clk *hclk;
u32 mode;
u32 crci;
struct regmap *tcsr;
};
static const struct of_device_id tcsr_dt_match[] = {
{ .compatible = "qcom,tcsr-ipq8064", .data = &config_ipq8064},
{ .compatible = "qcom,tcsr-apq8064", .data = &config_apq8064},
{ .compatible = "qcom,tcsr-msm8960", .data = &config_msm8960},
{ .compatible = "qcom,tcsr-msm8660", .data = &config_msm8660},
{ },
};
static int gsbi_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct device_node *tcsr_node;
const struct of_device_id *match;
struct resource *res;
void __iomem *base;
struct gsbi_info *gsbi;
int i, ret;
u32 mask, gsbi_num;
const struct crci_config *config = NULL;
gsbi = devm_kzalloc(&pdev->dev, sizeof(*gsbi), GFP_KERNEL);
if (!gsbi)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
/* get the tcsr node and setup the config and regmap */
gsbi->tcsr = syscon_regmap_lookup_by_phandle(node, "syscon-tcsr");
if (!IS_ERR(gsbi->tcsr)) {
tcsr_node = of_parse_phandle(node, "syscon-tcsr", 0);
if (tcsr_node) {
match = of_match_node(tcsr_dt_match, tcsr_node);
if (match)
config = match->data;
else
dev_warn(&pdev->dev, "no matching TCSR\n");
of_node_put(tcsr_node);
}
}
if (of_property_read_u32(node, "cell-index", &gsbi_num)) {
dev_err(&pdev->dev, "missing cell-index\n");
return -EINVAL;
}
if (gsbi_num < 1 || gsbi_num > MAX_GSBI) {
dev_err(&pdev->dev, "invalid cell-index\n");
return -EINVAL;
}
if (of_property_read_u32(node, "qcom,mode", &gsbi->mode)) {
dev_err(&pdev->dev, "missing mode configuration\n");
return -EINVAL;
}
/* not required, so default to 0 if not present */
of_property_read_u32(node, "qcom,crci", &gsbi->crci);
dev_info(&pdev->dev, "GSBI port protocol: %d crci: %d\n",
gsbi->mode, gsbi->crci);
gsbi->hclk = devm_clk_get(&pdev->dev, "iface");
if (IS_ERR(gsbi->hclk))
return PTR_ERR(gsbi->hclk);
clk_prepare_enable(gsbi->hclk);
writel_relaxed((gsbi->mode << GSBI_PROTOCOL_SHIFT) | gsbi->crci,
base + GSBI_CTRL_REG);
/*
* modify tcsr to reflect mode and ADM CRCI mux
* Each gsbi contains a pair of bits, one for RX and one for TX
* SPI mode requires both bits cleared, otherwise they are set
*/
if (config) {
for (i = 0; i < config->num_rows; i++) {
mask = config->array[i][gsbi_num - 1];
if (gsbi->mode == GSBI_PROT_SPI)
regmap_update_bits(gsbi->tcsr,
TCSR_ADM_CRCI_BASE + 4 * i, mask, 0);
else
regmap_update_bits(gsbi->tcsr,
TCSR_ADM_CRCI_BASE + 4 * i, mask, mask);
}
}
/* make sure the gsbi control write is not reordered */
wmb();
platform_set_drvdata(pdev, gsbi);
ret = of_platform_populate(node, NULL, NULL, &pdev->dev);
if (ret)
clk_disable_unprepare(gsbi->hclk);
return ret;
}
static int gsbi_remove(struct platform_device *pdev)
{
struct gsbi_info *gsbi = platform_get_drvdata(pdev);
clk_disable_unprepare(gsbi->hclk);
return 0;
}
static const struct of_device_id gsbi_dt_match[] = {
{ .compatible = "qcom,gsbi-v1.0.0", },
{ },
};
MODULE_DEVICE_TABLE(of, gsbi_dt_match);
static struct platform_driver gsbi_driver = {
.driver = {
.name = "gsbi",
.of_match_table = gsbi_dt_match,
},
.probe = gsbi_probe,
.remove = gsbi_remove,
};
module_platform_driver(gsbi_driver);
MODULE_AUTHOR("Andy Gross <agross@codeaurora.org>");
MODULE_DESCRIPTION("QCOM GSBI driver");
MODULE_LICENSE("GPL v2");
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