[PATCH v2 3/4] clk: en7523: Add reset-controller support for EN7581 SoC
Lorenzo Bianconi
lorenzo at kernel.org
Fri May 17 05:28:13 PDT 2024
Introduce reset API support to EN7581 clock driver.
Tested-by: Zhengping Zhang <zhengping.zhang at airoha.com>
Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>
---
drivers/clk/clk-en7523.c | 189 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 187 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/clk-en7523.c b/drivers/clk/clk-en7523.c
index 381605be333f..20edfb2c43c7 100644
--- a/drivers/clk/clk-en7523.c
+++ b/drivers/clk/clk-en7523.c
@@ -6,7 +6,11 @@
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.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)
@@ -65,8 +69,20 @@ struct en_clk_gate {
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 *base,
void __iomem *np_base);
};
@@ -169,6 +185,69 @@ static const struct en_clk_desc en7523_base_clks[] = {
}
};
+static const u16 en7581_rst_ofs[] = {
+ REG_RESET_CONTROL2,
+ REG_RESET_CONTROL1,
+};
+
+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];
@@ -424,6 +503,96 @@ static void en7523_register_clocks(struct device *dev, struct clk_hw_onecell_dat
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;
+ void __iomem *addr;
+ u32 val;
+
+ rst_data = container_of(rcdev, struct en_rst_data, rcdev);
+ addr = rst_data->base + rst_data->bank_ofs[id / RST_NR_PER_BANK];
+
+ 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;
+ void __iomem *addr;
+
+ rst_data = container_of(rcdev, struct en_rst_data, rcdev);
+ 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;
+
+ 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 device *dev, void __iomem *base,
+ const struct en_clk_soc_data *soc_data)
+{
+ struct en_rst_data *rst_data;
+
+ /* no reset lines available */
+ if (!soc_data->reset.idx_map_nr)
+ return 0;
+
+ 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;
@@ -456,12 +625,23 @@ static int en7523_clk_probe(struct platform_device *pdev)
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)
+ if (r) {
dev_err(&pdev->dev,
"could not register clock provider: %s: %d\n",
pdev->name, r);
+ return r;
+ }
+
+ r = en7523_reset_register(&pdev->dev, np_base, soc_data);
+ if (r) {
+ dev_err(&pdev->dev,
+ "could not register reset controller: %s: %d\n",
+ pdev->name, r);
+ of_clk_del_provider(node);
+ return r;
+ }
- return r;
+ return 0;
}
static const struct en_clk_soc_data en7523_data = {
@@ -480,6 +660,11 @@ static const struct en_clk_soc_data en7581_data = {
.unprepare = en7581_pci_unprepare,
.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,
};
--
2.45.0
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