232 lines
6.6 KiB
C
232 lines
6.6 KiB
C
/*
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* Copyright (C) 2015 Atmel
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*
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* Alexandre Belloni <alexandre.belloni@free-electrons.com
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* Boris Brezillon <boris.brezillon@free-electrons.com
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*
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*/
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#define pr_fmt(fmt) "AT91: " fmt
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <linux/slab.h>
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#include <linux/sys_soc.h>
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#include "soc.h"
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#define AT91_DBGU_CIDR 0x40
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#define AT91_DBGU_EXID 0x44
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#define AT91_CHIPID_CIDR 0x00
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#define AT91_CHIPID_EXID 0x04
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#define AT91_CIDR_VERSION(x) ((x) & 0x1f)
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#define AT91_CIDR_EXT BIT(31)
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#define AT91_CIDR_MATCH_MASK 0x7fffffe0
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static const struct at91_soc __initconst socs[] = {
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#ifdef CONFIG_SOC_AT91RM9200
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AT91_SOC(AT91RM9200_CIDR_MATCH, 0, "at91rm9200 BGA", "at91rm9200"),
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#endif
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#ifdef CONFIG_SOC_AT91SAM9
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AT91_SOC(AT91SAM9260_CIDR_MATCH, 0, "at91sam9260", NULL),
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AT91_SOC(AT91SAM9261_CIDR_MATCH, 0, "at91sam9261", NULL),
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AT91_SOC(AT91SAM9263_CIDR_MATCH, 0, "at91sam9263", NULL),
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AT91_SOC(AT91SAM9G20_CIDR_MATCH, 0, "at91sam9g20", NULL),
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AT91_SOC(AT91SAM9RL64_CIDR_MATCH, 0, "at91sam9rl64", NULL),
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AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9M11_EXID_MATCH,
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"at91sam9m11", "at91sam9g45"),
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AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9M10_EXID_MATCH,
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"at91sam9m10", "at91sam9g45"),
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AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9G46_EXID_MATCH,
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"at91sam9g46", "at91sam9g45"),
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AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9G45_EXID_MATCH,
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"at91sam9g45", "at91sam9g45"),
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AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G15_EXID_MATCH,
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"at91sam9g15", "at91sam9x5"),
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AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G35_EXID_MATCH,
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"at91sam9g35", "at91sam9x5"),
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AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9X35_EXID_MATCH,
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"at91sam9x35", "at91sam9x5"),
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AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G25_EXID_MATCH,
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"at91sam9g25", "at91sam9x5"),
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AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9X25_EXID_MATCH,
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"at91sam9x25", "at91sam9x5"),
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AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9CN12_EXID_MATCH,
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"at91sam9cn12", "at91sam9n12"),
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AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9N12_EXID_MATCH,
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"at91sam9n12", "at91sam9n12"),
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AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9CN11_EXID_MATCH,
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"at91sam9cn11", "at91sam9n12"),
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AT91_SOC(AT91SAM9XE128_CIDR_MATCH, 0, "at91sam9xe128", "at91sam9xe128"),
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AT91_SOC(AT91SAM9XE256_CIDR_MATCH, 0, "at91sam9xe256", "at91sam9xe256"),
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AT91_SOC(AT91SAM9XE512_CIDR_MATCH, 0, "at91sam9xe512", "at91sam9xe512"),
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#endif
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#ifdef CONFIG_SOC_SAMA5
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AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D21CU_EXID_MATCH,
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"sama5d21", "sama5d2"),
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AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D22CU_EXID_MATCH,
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"sama5d22", "sama5d2"),
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AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D23CU_EXID_MATCH,
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"sama5d23", "sama5d2"),
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AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D24CX_EXID_MATCH,
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"sama5d24", "sama5d2"),
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AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D24CU_EXID_MATCH,
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"sama5d24", "sama5d2"),
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AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D26CU_EXID_MATCH,
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"sama5d26", "sama5d2"),
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AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D27CU_EXID_MATCH,
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"sama5d27", "sama5d2"),
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AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D27CN_EXID_MATCH,
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"sama5d27", "sama5d2"),
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AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D28CU_EXID_MATCH,
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"sama5d28", "sama5d2"),
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AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D28CN_EXID_MATCH,
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"sama5d28", "sama5d2"),
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AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D31_EXID_MATCH,
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"sama5d31", "sama5d3"),
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AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D33_EXID_MATCH,
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"sama5d33", "sama5d3"),
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AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D34_EXID_MATCH,
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"sama5d34", "sama5d3"),
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AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D35_EXID_MATCH,
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"sama5d35", "sama5d3"),
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AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D36_EXID_MATCH,
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"sama5d36", "sama5d3"),
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AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D41_EXID_MATCH,
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"sama5d41", "sama5d4"),
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AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D42_EXID_MATCH,
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"sama5d42", "sama5d4"),
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AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D43_EXID_MATCH,
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"sama5d43", "sama5d4"),
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AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D44_EXID_MATCH,
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"sama5d44", "sama5d4"),
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#endif
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{ /* sentinel */ },
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};
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static int __init at91_get_cidr_exid_from_dbgu(u32 *cidr, u32 *exid)
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{
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struct device_node *np;
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void __iomem *regs;
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np = of_find_compatible_node(NULL, NULL, "atmel,at91rm9200-dbgu");
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if (!np)
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np = of_find_compatible_node(NULL, NULL,
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"atmel,at91sam9260-dbgu");
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if (!np)
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return -ENODEV;
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regs = of_iomap(np, 0);
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of_node_put(np);
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if (!regs) {
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pr_warn("Could not map DBGU iomem range");
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return -ENXIO;
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}
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*cidr = readl(regs + AT91_DBGU_CIDR);
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*exid = readl(regs + AT91_DBGU_EXID);
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iounmap(regs);
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return 0;
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}
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static int __init at91_get_cidr_exid_from_chipid(u32 *cidr, u32 *exid)
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{
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struct device_node *np;
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void __iomem *regs;
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np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-chipid");
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if (!np)
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return -ENODEV;
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regs = of_iomap(np, 0);
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of_node_put(np);
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if (!regs) {
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pr_warn("Could not map DBGU iomem range");
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return -ENXIO;
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}
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*cidr = readl(regs + AT91_CHIPID_CIDR);
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*exid = readl(regs + AT91_CHIPID_EXID);
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iounmap(regs);
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return 0;
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}
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struct soc_device * __init at91_soc_init(const struct at91_soc *socs)
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{
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struct soc_device_attribute *soc_dev_attr;
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const struct at91_soc *soc;
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struct soc_device *soc_dev;
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u32 cidr, exid;
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int ret;
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/*
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* With SAMA5D2 and later SoCs, CIDR and EXID registers are no more
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* in the dbgu device but in the chipid device whose purpose is only
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* to expose these two registers.
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*/
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ret = at91_get_cidr_exid_from_dbgu(&cidr, &exid);
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if (ret)
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ret = at91_get_cidr_exid_from_chipid(&cidr, &exid);
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if (ret) {
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if (ret == -ENODEV)
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pr_warn("Could not find identification node");
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return NULL;
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}
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for (soc = socs; soc->name; soc++) {
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if (soc->cidr_match != (cidr & AT91_CIDR_MATCH_MASK))
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continue;
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if (!(cidr & AT91_CIDR_EXT) || soc->exid_match == exid)
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break;
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}
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if (!soc->name) {
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pr_warn("Could not find matching SoC description\n");
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return NULL;
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}
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soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
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if (!soc_dev_attr)
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return NULL;
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soc_dev_attr->family = soc->family;
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soc_dev_attr->soc_id = soc->name;
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soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%X",
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AT91_CIDR_VERSION(cidr));
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soc_dev = soc_device_register(soc_dev_attr);
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if (IS_ERR(soc_dev)) {
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kfree(soc_dev_attr->revision);
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kfree(soc_dev_attr);
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pr_warn("Could not register SoC device\n");
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return NULL;
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}
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if (soc->family)
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pr_info("Detected SoC family: %s\n", soc->family);
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pr_info("Detected SoC: %s, revision %X\n", soc->name,
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AT91_CIDR_VERSION(cidr));
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return soc_dev;
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}
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static int __init atmel_soc_device_init(void)
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{
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at91_soc_init(socs);
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return 0;
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}
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subsys_initcall(atmel_soc_device_init);
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