kevin/linux
1
Fork 0
Code
cb6fcef8b4
linux/drivers/clk/clk-en7523.c
Lorenzo Bianconi 58c53d4314 clk: en7523: fix rate divider for slic and spi clocks 
Introduce div_offset field in en_clk_desc struct in order to fix rate
divider estimation in en7523_get_div routine for slic and spi fixed
rate clocks.
Moreover, fix base_shift for crypto clock.

Fixes: 1e62731791 ("clk: en7523: Add clock driver for Airoha EN7523 SoC")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/c491bdea05d847f1f1294b94f14725d292eb95d0.1718615934.git.lorenzo@kernel.org
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2024-07-08 14:43:28 -07:00

648 lines
16 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-only
#include <linux/delay.h>
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/reset-controller.h>
#include <dt-bindings/clock/en7523-clk.h>
#include <dt-bindings/reset/airoha,en7581-reset.h>
#define RST_NR_PER_BANK 32
#define REG_PCI_CONTROL 0x88
#define REG_PCI_CONTROL_PERSTOUT BIT(29)
#define REG_PCI_CONTROL_PERSTOUT1 BIT(26)
#define REG_PCI_CONTROL_REFCLK_EN0 BIT(23)
#define REG_PCI_CONTROL_REFCLK_EN1 BIT(22)
#define REG_PCI_CONTROL_PERSTOUT2 BIT(16)
#define REG_GSW_CLK_DIV_SEL 0x1b4
#define REG_EMI_CLK_DIV_SEL 0x1b8
#define REG_BUS_CLK_DIV_SEL 0x1bc
#define REG_SPI_CLK_DIV_SEL 0x1c4
#define REG_SPI_CLK_FREQ_SEL 0x1c8
#define REG_NPU_CLK_DIV_SEL 0x1fc
#define REG_CRYPTO_CLKSRC 0x200
#define REG_RESET_CONTROL2 0x830
#define REG_RESET2_CONTROL_PCIE2 BIT(27)
#define REG_RESET_CONTROL1 0x834
#define REG_RESET_CONTROL_PCIEHB BIT(29)
#define REG_RESET_CONTROL_PCIE1 BIT(27)
#define REG_RESET_CONTROL_PCIE2 BIT(26)
/* EN7581 */
#define REG_PCIE0_MEM 0x00
#define REG_PCIE0_MEM_MASK 0x04
#define REG_PCIE1_MEM 0x08
#define REG_PCIE1_MEM_MASK 0x0c
#define REG_PCIE2_MEM 0x10
#define REG_PCIE2_MEM_MASK 0x14
#define REG_NP_SCU_PCIC 0x88
#define REG_NP_SCU_SSTR 0x9c
#define REG_PCIE_XSI0_SEL_MASK GENMASK(14, 13)
#define REG_PCIE_XSI1_SEL_MASK GENMASK(12, 11)
#define REG_RST_CTRL2 0x00
#define REG_RST_CTRL1 0x04
struct en_clk_desc {
int id;
const char *name;
u32 base_reg;
u8 base_bits;
u8 base_shift;
union {
const unsigned int *base_values;
unsigned int base_value;
};
size_t n_base_values;
u16 div_reg;
u8 div_bits;
u8 div_shift;
u16 div_val0;
u8 div_step;
u8 div_offset;
};
struct en_clk_gate {
void __iomem *base;
struct clk_hw hw;
};
struct en_rst_data {
const u16 *bank_ofs;
const u16 *idx_map;
void __iomem *base;
struct reset_controller_dev rcdev;
};
struct en_clk_soc_data {
const struct clk_ops pcie_ops;
struct {
const u16 *bank_ofs;
const u16 *idx_map;
u16 idx_map_nr;
} reset;
int (*hw_init)(struct platform_device *pdev, void __iomem *np_base);
};
static const u32 gsw_base[] = { 400000000, 500000000 };
static const u32 emi_base[] = { 333000000, 400000000 };
static const u32 bus_base[] = { 500000000, 540000000 };
static const u32 slic_base[] = { 100000000, 3125000 };
static const u32 npu_base[] = { 333000000, 400000000, 500000000 };
static const struct en_clk_desc en7523_base_clks[] = {
{
.id = EN7523_CLK_GSW,
.name = "gsw",
.base_reg = REG_GSW_CLK_DIV_SEL,
.base_bits = 1,
.base_shift = 8,
.base_values = gsw_base,
.n_base_values = ARRAY_SIZE(gsw_base),
.div_bits = 3,
.div_shift = 0,
.div_step = 1,
.div_offset = 1,
}, {
.id = EN7523_CLK_EMI,
.name = "emi",
.base_reg = REG_EMI_CLK_DIV_SEL,
.base_bits = 1,
.base_shift = 8,
.base_values = emi_base,
.n_base_values = ARRAY_SIZE(emi_base),
.div_bits = 3,
.div_shift = 0,
.div_step = 1,
.div_offset = 1,
}, {
.id = EN7523_CLK_BUS,
.name = "bus",
.base_reg = REG_BUS_CLK_DIV_SEL,
.base_bits = 1,
.base_shift = 8,
.base_values = bus_base,
.n_base_values = ARRAY_SIZE(bus_base),
.div_bits = 3,
.div_shift = 0,
.div_step = 1,
.div_offset = 1,
}, {
.id = EN7523_CLK_SLIC,
.name = "slic",
.base_reg = REG_SPI_CLK_FREQ_SEL,
.base_bits = 1,
.base_shift = 0,
.base_values = slic_base,
.n_base_values = ARRAY_SIZE(slic_base),
.div_reg = REG_SPI_CLK_DIV_SEL,
.div_bits = 5,
.div_shift = 24,
.div_val0 = 20,
.div_step = 2,
}, {
.id = EN7523_CLK_SPI,
.name = "spi",
.base_reg = REG_SPI_CLK_DIV_SEL,
.base_value = 400000000,
.div_bits = 5,
.div_shift = 8,
.div_val0 = 40,
.div_step = 2,
}, {
.id = EN7523_CLK_NPU,
.name = "npu",
.base_reg = REG_NPU_CLK_DIV_SEL,
.base_bits = 2,
.base_shift = 8,
.base_values = npu_base,
.n_base_values = ARRAY_SIZE(npu_base),
.div_bits = 3,
.div_shift = 0,
.div_step = 1,
.div_offset = 1,
}, {
.id = EN7523_CLK_CRYPTO,
.name = "crypto",
.base_reg = REG_CRYPTO_CLKSRC,
.base_bits = 1,
.base_shift = 0,
.base_values = emi_base,
.n_base_values = ARRAY_SIZE(emi_base),
}
};
static const u16 en7581_rst_ofs[] = {
REG_RST_CTRL2,
REG_RST_CTRL1,
};
static const u16 en7581_rst_map[] = {
/* RST_CTRL2 */
[EN7581_XPON_PHY_RST] = 0,
[EN7581_CPU_TIMER2_RST] = 2,
[EN7581_HSUART_RST] = 3,
[EN7581_UART4_RST] = 4,
[EN7581_UART5_RST] = 5,
[EN7581_I2C2_RST] = 6,
[EN7581_XSI_MAC_RST] = 7,
[EN7581_XSI_PHY_RST] = 8,
[EN7581_NPU_RST] = 9,
[EN7581_I2S_RST] = 10,
[EN7581_TRNG_RST] = 11,
[EN7581_TRNG_MSTART_RST] = 12,
[EN7581_DUAL_HSI0_RST] = 13,
[EN7581_DUAL_HSI1_RST] = 14,
[EN7581_HSI_RST] = 15,
[EN7581_DUAL_HSI0_MAC_RST] = 16,
[EN7581_DUAL_HSI1_MAC_RST] = 17,
[EN7581_HSI_MAC_RST] = 18,
[EN7581_WDMA_RST] = 19,
[EN7581_WOE0_RST] = 20,
[EN7581_WOE1_RST] = 21,
[EN7581_HSDMA_RST] = 22,
[EN7581_TDMA_RST] = 24,
[EN7581_EMMC_RST] = 25,
[EN7581_SOE_RST] = 26,
[EN7581_PCIE2_RST] = 27,
[EN7581_XFP_MAC_RST] = 28,
[EN7581_USB_HOST_P1_RST] = 29,
[EN7581_USB_HOST_P1_U3_PHY_RST] = 30,
/* RST_CTRL1 */
[EN7581_PCM1_ZSI_ISI_RST] = RST_NR_PER_BANK + 0,
[EN7581_FE_PDMA_RST] = RST_NR_PER_BANK + 1,
[EN7581_FE_QDMA_RST] = RST_NR_PER_BANK + 2,
[EN7581_PCM_SPIWP_RST] = RST_NR_PER_BANK + 4,
[EN7581_CRYPTO_RST] = RST_NR_PER_BANK + 6,
[EN7581_TIMER_RST] = RST_NR_PER_BANK + 8,
[EN7581_PCM1_RST] = RST_NR_PER_BANK + 11,
[EN7581_UART_RST] = RST_NR_PER_BANK + 12,
[EN7581_GPIO_RST] = RST_NR_PER_BANK + 13,
[EN7581_GDMA_RST] = RST_NR_PER_BANK + 14,
[EN7581_I2C_MASTER_RST] = RST_NR_PER_BANK + 16,
[EN7581_PCM2_ZSI_ISI_RST] = RST_NR_PER_BANK + 17,
[EN7581_SFC_RST] = RST_NR_PER_BANK + 18,
[EN7581_UART2_RST] = RST_NR_PER_BANK + 19,
[EN7581_GDMP_RST] = RST_NR_PER_BANK + 20,
[EN7581_FE_RST] = RST_NR_PER_BANK + 21,
[EN7581_USB_HOST_P0_RST] = RST_NR_PER_BANK + 22,
[EN7581_GSW_RST] = RST_NR_PER_BANK + 23,
[EN7581_SFC2_PCM_RST] = RST_NR_PER_BANK + 25,
[EN7581_PCIE0_RST] = RST_NR_PER_BANK + 26,
[EN7581_PCIE1_RST] = RST_NR_PER_BANK + 27,
[EN7581_CPU_TIMER_RST] = RST_NR_PER_BANK + 28,
[EN7581_PCIE_HB_RST] = RST_NR_PER_BANK + 29,
[EN7581_XPON_MAC_RST] = RST_NR_PER_BANK + 31,
};
static unsigned int en7523_get_base_rate(void __iomem *base, unsigned int i)
{
const struct en_clk_desc *desc = &en7523_base_clks[i];
u32 val;
if (!desc->base_bits)
return desc->base_value;
val = readl(base + desc->base_reg);
val >>= desc->base_shift;
val &= (1 << desc->base_bits) - 1;
if (val >= desc->n_base_values)
return 0;
return desc->base_values[val];
}
static u32 en7523_get_div(void __iomem *base, int i)
{
const struct en_clk_desc *desc = &en7523_base_clks[i];
u32 reg, val;
if (!desc->div_bits)
return 1;
reg = desc->div_reg ? desc->div_reg : desc->base_reg;
val = readl(base + reg);
val >>= desc->div_shift;
val &= (1 << desc->div_bits) - 1;
if (!val && desc->div_val0)
return desc->div_val0;
return (val + desc->div_offset) * desc->div_step;
}
static int en7523_pci_is_enabled(struct clk_hw *hw)
{
struct en_clk_gate *cg = container_of(hw, struct en_clk_gate, hw);
return !!(readl(cg->base + REG_PCI_CONTROL) & REG_PCI_CONTROL_REFCLK_EN1);
}
static int en7523_pci_prepare(struct clk_hw *hw)
{
struct en_clk_gate *cg = container_of(hw, struct en_clk_gate, hw);
void __iomem *np_base = cg->base;
u32 val, mask;
/* Need to pull device low before reset */
val = readl(np_base + REG_PCI_CONTROL);
val &= ~(REG_PCI_CONTROL_PERSTOUT1 | REG_PCI_CONTROL_PERSTOUT);
writel(val, np_base + REG_PCI_CONTROL);
usleep_range(1000, 2000);
/* Enable PCIe port 1 */
val |= REG_PCI_CONTROL_REFCLK_EN1;
writel(val, np_base + REG_PCI_CONTROL);
usleep_range(1000, 2000);
/* Reset to default */
val = readl(np_base + REG_RESET_CONTROL1);
mask = REG_RESET_CONTROL_PCIE1 | REG_RESET_CONTROL_PCIE2 |
REG_RESET_CONTROL_PCIEHB;
writel(val & ~mask, np_base + REG_RESET_CONTROL1);
usleep_range(1000, 2000);
writel(val | mask, np_base + REG_RESET_CONTROL1);
msleep(100);
writel(val & ~mask, np_base + REG_RESET_CONTROL1);
usleep_range(5000, 10000);
/* Release device */
mask = REG_PCI_CONTROL_PERSTOUT1 | REG_PCI_CONTROL_PERSTOUT;
val = readl(np_base + REG_PCI_CONTROL);
writel(val & ~mask, np_base + REG_PCI_CONTROL);
usleep_range(1000, 2000);
writel(val | mask, np_base + REG_PCI_CONTROL);
msleep(250);
return 0;
}
static void en7523_pci_unprepare(struct clk_hw *hw)
{
struct en_clk_gate *cg = container_of(hw, struct en_clk_gate, hw);
void __iomem *np_base = cg->base;
u32 val;
val = readl(np_base + REG_PCI_CONTROL);
val &= ~REG_PCI_CONTROL_REFCLK_EN1;
writel(val, np_base + REG_PCI_CONTROL);
}
static struct clk_hw *en7523_register_pcie_clk(struct device *dev,
void __iomem *np_base)
{
const struct en_clk_soc_data *soc_data = device_get_match_data(dev);
struct clk_init_data init = {
.name = "pcie",
.ops = &soc_data->pcie_ops,
};
struct en_clk_gate *cg;
cg = devm_kzalloc(dev, sizeof(*cg), GFP_KERNEL);
if (!cg)
return NULL;
cg->base = np_base;
cg->hw.init = &init;
if (init.ops->unprepare)
init.ops->unprepare(&cg->hw);
if (clk_hw_register(dev, &cg->hw))
return NULL;
return &cg->hw;
}
static int en7581_pci_is_enabled(struct clk_hw *hw)
{
struct en_clk_gate *cg = container_of(hw, struct en_clk_gate, hw);
u32 val, mask;
mask = REG_PCI_CONTROL_REFCLK_EN0 | REG_PCI_CONTROL_REFCLK_EN1;
val = readl(cg->base + REG_PCI_CONTROL);
return (val & mask) == mask;
}
static int en7581_pci_enable(struct clk_hw *hw)
{
struct en_clk_gate *cg = container_of(hw, struct en_clk_gate, hw);
void __iomem *np_base = cg->base;
u32 val, mask;
mask = REG_PCI_CONTROL_REFCLK_EN0 | REG_PCI_CONTROL_REFCLK_EN1 |
REG_PCI_CONTROL_PERSTOUT1 | REG_PCI_CONTROL_PERSTOUT2 |
REG_PCI_CONTROL_PERSTOUT;
val = readl(np_base + REG_PCI_CONTROL);
writel(val | mask, np_base + REG_PCI_CONTROL);
msleep(250);
return 0;
}
static void en7581_pci_disable(struct clk_hw *hw)
{
struct en_clk_gate *cg = container_of(hw, struct en_clk_gate, hw);
void __iomem *np_base = cg->base;
u32 val, mask;
mask = REG_PCI_CONTROL_REFCLK_EN0 | REG_PCI_CONTROL_REFCLK_EN1 |
REG_PCI_CONTROL_PERSTOUT1 | REG_PCI_CONTROL_PERSTOUT2 |
REG_PCI_CONTROL_PERSTOUT;
val = readl(np_base + REG_PCI_CONTROL);
writel(val & ~mask, np_base + REG_PCI_CONTROL);
usleep_range(1000, 2000);
}
static int en7581_clk_hw_init(struct platform_device *pdev,
void __iomem *np_base)
{
void __iomem *pb_base;
u32 val;
pb_base = devm_platform_ioremap_resource(pdev, 3);
if (IS_ERR(pb_base))
return PTR_ERR(pb_base);
val = readl(np_base + REG_NP_SCU_SSTR);
val &= ~(REG_PCIE_XSI0_SEL_MASK | REG_PCIE_XSI1_SEL_MASK);
writel(val, np_base + REG_NP_SCU_SSTR);
val = readl(np_base + REG_NP_SCU_PCIC);
writel(val | 3, np_base + REG_NP_SCU_PCIC);
writel(0x20000000, pb_base + REG_PCIE0_MEM);
writel(0xfc000000, pb_base + REG_PCIE0_MEM_MASK);
writel(0x24000000, pb_base + REG_PCIE1_MEM);
writel(0xfc000000, pb_base + REG_PCIE1_MEM_MASK);
writel(0x28000000, pb_base + REG_PCIE2_MEM);
writel(0xfc000000, pb_base + REG_PCIE2_MEM_MASK);
return 0;
}
static void en7523_register_clocks(struct device *dev, struct clk_hw_onecell_data *clk_data,
void __iomem *base, void __iomem *np_base)
{
struct clk_hw *hw;
u32 rate;
int i;
for (i = 0; i < ARRAY_SIZE(en7523_base_clks); i++) {
const struct en_clk_desc *desc = &en7523_base_clks[i];
rate = en7523_get_base_rate(base, i);
rate /= en7523_get_div(base, i);
hw = clk_hw_register_fixed_rate(dev, desc->name, NULL, 0, rate);
if (IS_ERR(hw)) {
pr_err("Failed to register clk %s: %ld\n",
desc->name, PTR_ERR(hw));
continue;
}
clk_data->hws[desc->id] = hw;
}
hw = en7523_register_pcie_clk(dev, np_base);
clk_data->hws[EN7523_CLK_PCIE] = hw;
clk_data->num = EN7523_NUM_CLOCKS;
}
static int en7523_reset_update(struct reset_controller_dev *rcdev,
unsigned long id, bool assert)
{
struct en_rst_data *rst_data = container_of(rcdev, struct en_rst_data, rcdev);
void __iomem *addr = rst_data->base + rst_data->bank_ofs[id / RST_NR_PER_BANK];
u32 val;
val = readl(addr);
if (assert)
val |= BIT(id % RST_NR_PER_BANK);
else
val &= ~BIT(id % RST_NR_PER_BANK);
writel(val, addr);
return 0;
}
static int en7523_reset_assert(struct reset_controller_dev *rcdev,
unsigned long id)
{
return en7523_reset_update(rcdev, id, true);
}
static int en7523_reset_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
return en7523_reset_update(rcdev, id, false);
}
static int en7523_reset_status(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct en_rst_data *rst_data = container_of(rcdev, struct en_rst_data, rcdev);
void __iomem *addr = rst_data->base + rst_data->bank_ofs[id / RST_NR_PER_BANK];
return !!(readl(addr) & BIT(id % RST_NR_PER_BANK));
}
static int en7523_reset_xlate(struct reset_controller_dev *rcdev,
const struct of_phandle_args *reset_spec)
{
struct en_rst_data *rst_data = container_of(rcdev, struct en_rst_data, rcdev);
if (reset_spec->args[0] >= rcdev->nr_resets)
return -EINVAL;
return rst_data->idx_map[reset_spec->args[0]];
}
static const struct reset_control_ops en7523_reset_ops = {
.assert = en7523_reset_assert,
.deassert = en7523_reset_deassert,
.status = en7523_reset_status,
};
static int en7523_reset_register(struct platform_device *pdev,
const struct en_clk_soc_data *soc_data)
{
struct device *dev = &pdev->dev;
struct en_rst_data *rst_data;
void __iomem *base;
/* no reset lines available */
if (!soc_data->reset.idx_map_nr)
return 0;
base = devm_platform_ioremap_resource(pdev, 2);
if (IS_ERR(base))
return PTR_ERR(base);
rst_data = devm_kzalloc(dev, sizeof(*rst_data), GFP_KERNEL);
if (!rst_data)
return -ENOMEM;
rst_data->bank_ofs = soc_data->reset.bank_ofs;
rst_data->idx_map = soc_data->reset.idx_map;
rst_data->base = base;
rst_data->rcdev.nr_resets = soc_data->reset.idx_map_nr;
rst_data->rcdev.of_xlate = en7523_reset_xlate;
rst_data->rcdev.ops = &en7523_reset_ops;
rst_data->rcdev.of_node = dev->of_node;
rst_data->rcdev.of_reset_n_cells = 1;
rst_data->rcdev.owner = THIS_MODULE;
rst_data->rcdev.dev = dev;
return devm_reset_controller_register(dev, &rst_data->rcdev);
}
static int en7523_clk_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
const struct en_clk_soc_data *soc_data;
struct clk_hw_onecell_data *clk_data;
void __iomem *base, *np_base;
int r;
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return PTR_ERR(base);
np_base = devm_platform_ioremap_resource(pdev, 1);
if (IS_ERR(np_base))
return PTR_ERR(np_base);
soc_data = device_get_match_data(&pdev->dev);
if (soc_data->hw_init) {
r = soc_data->hw_init(pdev, np_base);
if (r)
return r;
}
clk_data = devm_kzalloc(&pdev->dev,
struct_size(clk_data, hws, EN7523_NUM_CLOCKS),
GFP_KERNEL);
if (!clk_data)
return -ENOMEM;
en7523_register_clocks(&pdev->dev, clk_data, base, np_base);
r = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
if (r)
return dev_err_probe(&pdev->dev, r, "Could not register clock provider: %s\n",
pdev->name);
r = en7523_reset_register(pdev, soc_data);
if (r) {
of_clk_del_provider(node);
return dev_err_probe(&pdev->dev, r, "Could not register reset controller: %s\n",
pdev->name);
}
return 0;
}
static const struct en_clk_soc_data en7523_data = {
.pcie_ops = {
.is_enabled = en7523_pci_is_enabled,
.prepare = en7523_pci_prepare,
.unprepare = en7523_pci_unprepare,
},
};
static const struct en_clk_soc_data en7581_data = {
.pcie_ops = {
.is_enabled = en7581_pci_is_enabled,
.enable = en7581_pci_enable,
.disable = en7581_pci_disable,
},
.reset = {
.bank_ofs = en7581_rst_ofs,
.idx_map = en7581_rst_map,
.idx_map_nr = ARRAY_SIZE(en7581_rst_map),
},
.hw_init = en7581_clk_hw_init,
};
static const struct of_device_id of_match_clk_en7523[] = {
{ .compatible = "airoha,en7523-scu", .data = &en7523_data },
{ .compatible = "airoha,en7581-scu", .data = &en7581_data },
{ /* sentinel */ }
};
static struct platform_driver clk_en7523_drv = {
.probe = en7523_clk_probe,
.driver = {
.name = "clk-en7523",
.of_match_table = of_match_clk_en7523,
.suppress_bind_attrs = true,
},
};
static int __init clk_en7523_init(void)
{
return platform_driver_register(&clk_en7523_drv);
}
arch_initcall(clk_en7523_init);
View Git Blame Copy Permalink