clk: at91: add at91rm9200 pmc driver

Add a driver for the PMC clocks of the at91rm9200.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lkml.kernel.org/r/20200214145934.53648-1-alexandre.belloni@bootlin.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

diff --git a/drivers/clk/at91/Makefile b/drivers/clk/at91/Makefile
index 7ab244f..8b90357 100644 (file)
--- a/drivers/clk/at91/Makefile
+++ b/drivers/clk/at91/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_HAVE_AT91_H32MX)         += clk-h32mx.o
 obj-$(CONFIG_HAVE_AT91_GENERATED_CLK)  += clk-generated.o
 obj-$(CONFIG_HAVE_AT91_I2S_MUX_CLK)    += clk-i2s-mux.o
 obj-$(CONFIG_HAVE_AT91_SAM9X60_PLL)    += clk-sam9x60-pll.o
+obj-$(CONFIG_SOC_AT91RM9200) += at91rm9200.o
 obj-$(CONFIG_SOC_AT91SAM9) += at91sam9260.o at91sam9rl.o at91sam9x5.o
 obj-$(CONFIG_SOC_AT91SAM9) += at91sam9g45.o
 obj-$(CONFIG_SOC_AT91SAM9) += at91sam9n12.o at91sam9x5.o

diff --git a/drivers/clk/at91/at91rm9200.c b/drivers/clk/at91/at91rm9200.c
new file mode 100644 (file)
index 0000000..c44a431
--- /dev/null
+++ b/drivers/clk/at91/at91rm9200.c
@@ -0,0 +1,199 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/clk-provider.h>
+#include <linux/mfd/syscon.h>
+#include <linux/slab.h>
+
+#include <dt-bindings/clock/at91.h>
+
+#include "pmc.h"
+
+struct sck {
+       char *n;
+       char *p;
+       u8 id;
+};
+
+struct pck {
+       char *n;
+       u8 id;
+};
+
+static const struct clk_master_characteristics rm9200_mck_characteristics = {
+       .output = { .min = 0, .max = 80000000 },
+       .divisors = { 1, 2, 3, 4 },
+};
+
+static u8 rm9200_pll_out[] = { 0, 2 };
+
+static const struct clk_range rm9200_pll_outputs[] = {
+       { .min = 80000000, .max = 160000000 },
+       { .min = 150000000, .max = 180000000 },
+};
+
+static const struct clk_pll_characteristics rm9200_pll_characteristics = {
+       .input = { .min = 1000000, .max = 32000000 },
+       .num_output = ARRAY_SIZE(rm9200_pll_outputs),
+       .output = rm9200_pll_outputs,
+       .out = rm9200_pll_out,
+};
+
+static const struct sck at91rm9200_systemck[] = {
+       { .n = "udpck", .p = "usbck",    .id = 2 },
+       { .n = "uhpck", .p = "usbck",    .id = 4 },
+       { .n = "pck0",  .p = "prog0",    .id = 8 },
+       { .n = "pck1",  .p = "prog1",    .id = 9 },
+       { .n = "pck2",  .p = "prog2",    .id = 10 },
+       { .n = "pck3",  .p = "prog3",    .id = 11 },
+};
+
+static const struct pck at91rm9200_periphck[] = {
+       { .n = "pioA_clk",   .id = 2 },
+       { .n = "pioB_clk",   .id = 3 },
+       { .n = "pioC_clk",   .id = 4 },
+       { .n = "pioD_clk",   .id = 5 },
+       { .n = "usart0_clk", .id = 6 },
+       { .n = "usart1_clk", .id = 7 },
+       { .n = "usart2_clk", .id = 8 },
+       { .n = "usart3_clk", .id = 9 },
+       { .n = "mci0_clk",   .id = 10 },
+       { .n = "udc_clk",    .id = 11 },
+       { .n = "twi0_clk",   .id = 12 },
+       { .n = "spi0_clk",   .id = 13 },
+       { .n = "ssc0_clk",   .id = 14 },
+       { .n = "ssc1_clk",   .id = 15 },
+       { .n = "ssc2_clk",   .id = 16 },
+       { .n = "tc0_clk",    .id = 17 },
+       { .n = "tc1_clk",    .id = 18 },
+       { .n = "tc2_clk",    .id = 19 },
+       { .n = "tc3_clk",    .id = 20 },
+       { .n = "tc4_clk",    .id = 21 },
+       { .n = "tc5_clk",    .id = 22 },
+       { .n = "ohci_clk",   .id = 23 },
+       { .n = "macb0_clk",  .id = 24 },
+};
+
+static void __init at91rm9200_pmc_setup(struct device_node *np)
+{
+       const char *slowxtal_name, *mainxtal_name;
+       struct pmc_data *at91rm9200_pmc;
+       u32 usb_div[] = { 1, 2, 0, 0 };
+       const char *parent_names[6];
+       struct regmap *regmap;
+       struct clk_hw *hw;
+       int i;
+       bool bypass;
+
+       i = of_property_match_string(np, "clock-names", "slow_xtal");
+       if (i < 0)
+               return;
+
+       slowxtal_name = of_clk_get_parent_name(np, i);
+
+       i = of_property_match_string(np, "clock-names", "main_xtal");
+       if (i < 0)
+               return;
+       mainxtal_name = of_clk_get_parent_name(np, i);
+
+       regmap = device_node_to_regmap(np);
+       if (IS_ERR(regmap))
+               return;
+
+       at91rm9200_pmc = pmc_data_allocate(PMC_MAIN + 1,
+                                           nck(at91rm9200_systemck),
+                                           nck(at91rm9200_periphck), 0);
+       if (!at91rm9200_pmc)
+               return;
+
+       bypass = of_property_read_bool(np, "atmel,osc-bypass");
+
+       hw = at91_clk_register_main_osc(regmap, "main_osc", mainxtal_name,
+                                       bypass);
+       if (IS_ERR(hw))
+               goto err_free;
+
+       hw = at91_clk_register_rm9200_main(regmap, "mainck", "main_osc");
+       if (IS_ERR(hw))
+               goto err_free;
+
+       at91rm9200_pmc->chws[PMC_MAIN] = hw;
+
+       hw = at91_clk_register_pll(regmap, "pllack", "mainck", 0,
+                                  &at91rm9200_pll_layout,
+                                  &rm9200_pll_characteristics);
+       if (IS_ERR(hw))
+               goto err_free;
+
+       hw = at91_clk_register_pll(regmap, "pllbck", "mainck", 1,
+                                  &at91rm9200_pll_layout,
+                                  &rm9200_pll_characteristics);
+       if (IS_ERR(hw))
+               goto err_free;
+
+       parent_names[0] = slowxtal_name;
+       parent_names[1] = "mainck";
+       parent_names[2] = "pllack";
+       parent_names[3] = "pllbck";
+       hw = at91_clk_register_master(regmap, "masterck", 4, parent_names,
+                                     &at91rm9200_master_layout,
+                                     &rm9200_mck_characteristics);
+       if (IS_ERR(hw))
+               goto err_free;
+
+       at91rm9200_pmc->chws[PMC_MCK] = hw;
+
+       hw = at91rm9200_clk_register_usb(regmap, "usbck", "pllbck", usb_div);
+       if (IS_ERR(hw))
+               goto err_free;
+
+       parent_names[0] = slowxtal_name;
+       parent_names[1] = "mainck";
+       parent_names[2] = "pllack";
+       parent_names[3] = "pllbck";
+       for (i = 0; i < 4; i++) {
+               char name[6];
+
+               snprintf(name, sizeof(name), "prog%d", i);
+
+               hw = at91_clk_register_programmable(regmap, name,
+                                                   parent_names, 4, i,
+                                                   &at91rm9200_programmable_layout);
+               if (IS_ERR(hw))
+                       goto err_free;
+       }
+
+       for (i = 0; i < ARRAY_SIZE(at91rm9200_systemck); i++) {
+               hw = at91_clk_register_system(regmap, at91rm9200_systemck[i].n,
+                                             at91rm9200_systemck[i].p,
+                                             at91rm9200_systemck[i].id);
+               if (IS_ERR(hw))
+                       goto err_free;
+
+               at91rm9200_pmc->shws[at91rm9200_systemck[i].id] = hw;
+       }
+
+       for (i = 0; i < ARRAY_SIZE(at91rm9200_periphck); i++) {
+               hw = at91_clk_register_peripheral(regmap,
+                                                 at91rm9200_periphck[i].n,
+                                                 "masterck",
+                                                 at91rm9200_periphck[i].id);
+               if (IS_ERR(hw))
+                       goto err_free;
+
+               at91rm9200_pmc->phws[at91rm9200_periphck[i].id] = hw;
+       }
+
+       of_clk_add_hw_provider(np, of_clk_hw_pmc_get, at91rm9200_pmc);
+
+       return;
+
+err_free:
+       pmc_data_free(at91rm9200_pmc);
+}
+/*
+ * While the TCB can be used as the clocksource, the system timer is most likely
+ * to be used instead. However, the pinctrl driver doesn't support probe
+ * deferring properly. Once this is fixed, this can be switched to a platform
+ * driver.
+ */
+CLK_OF_DECLARE_DRIVER(at91rm9200_pmc, "atmel,at91rm9200-pmc",
+                     at91rm9200_pmc_setup);