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linux/drivers/clk/clk-asm9260.c
Maxime Ripard b1ed311baf clk: asm9260: Fix of_io_request_and_map error check 
of_io_request_and map returns an error pointer, but the current code assumes
that on error the returned pointer will be NULL.

Obviously, that makes the check completely useless. Change the test to actually
check for the proper error code.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Mike Turquette <mturquette@linaro.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: linux-clk@vger.kernel.org
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2015-05-13 12:32:52 -07:00

349 lines
11 KiB
C
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/*
* Copyright (c) 2014 Oleksij Rempel <linux@rempel-privat.de>.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/clk-provider.h>
#include <linux/spinlock.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <dt-bindings/clock/alphascale,asm9260.h>
#define HW_AHBCLKCTRL0 0x0020
#define HW_AHBCLKCTRL1 0x0030
#define HW_SYSPLLCTRL 0x0100
#define HW_MAINCLKSEL 0x0120
#define HW_MAINCLKUEN 0x0124
#define HW_UARTCLKSEL 0x0128
#define HW_UARTCLKUEN 0x012c
#define HW_I2S0CLKSEL 0x0130
#define HW_I2S0CLKUEN 0x0134
#define HW_I2S1CLKSEL 0x0138
#define HW_I2S1CLKUEN 0x013c
#define HW_WDTCLKSEL 0x0160
#define HW_WDTCLKUEN 0x0164
#define HW_CLKOUTCLKSEL 0x0170
#define HW_CLKOUTCLKUEN 0x0174
#define HW_CPUCLKDIV 0x017c
#define HW_SYSAHBCLKDIV 0x0180
#define HW_I2S0MCLKDIV 0x0190
#define HW_I2S0SCLKDIV 0x0194
#define HW_I2S1MCLKDIV 0x0188
#define HW_I2S1SCLKDIV 0x018c
#define HW_UART0CLKDIV 0x0198
#define HW_UART1CLKDIV 0x019c
#define HW_UART2CLKDIV 0x01a0
#define HW_UART3CLKDIV 0x01a4
#define HW_UART4CLKDIV 0x01a8
#define HW_UART5CLKDIV 0x01ac
#define HW_UART6CLKDIV 0x01b0
#define HW_UART7CLKDIV 0x01b4
#define HW_UART8CLKDIV 0x01b8
#define HW_UART9CLKDIV 0x01bc
#define HW_SPI0CLKDIV 0x01c0
#define HW_SPI1CLKDIV 0x01c4
#define HW_QUADSPICLKDIV 0x01c8
#define HW_SSP0CLKDIV 0x01d0
#define HW_NANDCLKDIV 0x01d4
#define HW_TRACECLKDIV 0x01e0
#define HW_CAMMCLKDIV 0x01e8
#define HW_WDTCLKDIV 0x01ec
#define HW_CLKOUTCLKDIV 0x01f4
#define HW_MACCLKDIV 0x01f8
#define HW_LCDCLKDIV 0x01fc
#define HW_ADCANACLKDIV 0x0200
static struct clk *clks[MAX_CLKS];
static struct clk_onecell_data clk_data;
static DEFINE_SPINLOCK(asm9260_clk_lock);
struct asm9260_div_clk {
unsigned int idx;
const char *name;
const char *parent_name;
u32 reg;
};
struct asm9260_gate_data {
unsigned int idx;
const char *name;
const char *parent_name;
u32 reg;
u8 bit_idx;
unsigned long flags;
};
struct asm9260_mux_clock {
u8 mask;
u32 *table;
const char *name;
const char **parent_names;
u8 num_parents;
unsigned long offset;
unsigned long flags;
};
static void __iomem *base;
static const struct asm9260_div_clk asm9260_div_clks[] __initconst = {
{ CLKID_SYS_CPU, "cpu_div", "main_gate", HW_CPUCLKDIV },
{ CLKID_SYS_AHB, "ahb_div", "cpu_div", HW_SYSAHBCLKDIV },
/* i2s has two deviders: one for only external mclk and internal
* devider for all clks. */
{ CLKID_SYS_I2S0M, "i2s0m_div", "i2s0_mclk", HW_I2S0MCLKDIV },
{ CLKID_SYS_I2S1M, "i2s1m_div", "i2s1_mclk", HW_I2S1MCLKDIV },
{ CLKID_SYS_I2S0S, "i2s0s_div", "i2s0_gate", HW_I2S0SCLKDIV },
{ CLKID_SYS_I2S1S, "i2s1s_div", "i2s0_gate", HW_I2S1SCLKDIV },
{ CLKID_SYS_UART0, "uart0_div", "uart_gate", HW_UART0CLKDIV },
{ CLKID_SYS_UART1, "uart1_div", "uart_gate", HW_UART1CLKDIV },
{ CLKID_SYS_UART2, "uart2_div", "uart_gate", HW_UART2CLKDIV },
{ CLKID_SYS_UART3, "uart3_div", "uart_gate", HW_UART3CLKDIV },
{ CLKID_SYS_UART4, "uart4_div", "uart_gate", HW_UART4CLKDIV },
{ CLKID_SYS_UART5, "uart5_div", "uart_gate", HW_UART5CLKDIV },
{ CLKID_SYS_UART6, "uart6_div", "uart_gate", HW_UART6CLKDIV },
{ CLKID_SYS_UART7, "uart7_div", "uart_gate", HW_UART7CLKDIV },
{ CLKID_SYS_UART8, "uart8_div", "uart_gate", HW_UART8CLKDIV },
{ CLKID_SYS_UART9, "uart9_div", "uart_gate", HW_UART9CLKDIV },
{ CLKID_SYS_SPI0, "spi0_div", "main_gate", HW_SPI0CLKDIV },
{ CLKID_SYS_SPI1, "spi1_div", "main_gate", HW_SPI1CLKDIV },
{ CLKID_SYS_QUADSPI, "quadspi_div", "main_gate", HW_QUADSPICLKDIV },
{ CLKID_SYS_SSP0, "ssp0_div", "main_gate", HW_SSP0CLKDIV },
{ CLKID_SYS_NAND, "nand_div", "main_gate", HW_NANDCLKDIV },
{ CLKID_SYS_TRACE, "trace_div", "main_gate", HW_TRACECLKDIV },
{ CLKID_SYS_CAMM, "camm_div", "main_gate", HW_CAMMCLKDIV },
{ CLKID_SYS_MAC, "mac_div", "main_gate", HW_MACCLKDIV },
{ CLKID_SYS_LCD, "lcd_div", "main_gate", HW_LCDCLKDIV },
{ CLKID_SYS_ADCANA, "adcana_div", "main_gate", HW_ADCANACLKDIV },
{ CLKID_SYS_WDT, "wdt_div", "wdt_gate", HW_WDTCLKDIV },
{ CLKID_SYS_CLKOUT, "clkout_div", "clkout_gate", HW_CLKOUTCLKDIV },
};
static const struct asm9260_gate_data asm9260_mux_gates[] __initconst = {
{ 0, "main_gate", "main_mux", HW_MAINCLKUEN, 0 },
{ 0, "uart_gate", "uart_mux", HW_UARTCLKUEN, 0 },
{ 0, "i2s0_gate", "i2s0_mux", HW_I2S0CLKUEN, 0 },
{ 0, "i2s1_gate", "i2s1_mux", HW_I2S1CLKUEN, 0 },
{ 0, "wdt_gate", "wdt_mux", HW_WDTCLKUEN, 0 },
{ 0, "clkout_gate", "clkout_mux", HW_CLKOUTCLKUEN, 0 },
};
static const struct asm9260_gate_data asm9260_ahb_gates[] __initconst = {
/* ahb gates */
{ CLKID_AHB_ROM, "rom", "ahb_div",
HW_AHBCLKCTRL0, 1, CLK_IGNORE_UNUSED},
{ CLKID_AHB_RAM, "ram", "ahb_div",
HW_AHBCLKCTRL0, 2, CLK_IGNORE_UNUSED},
{ CLKID_AHB_GPIO, "gpio", "ahb_div",
HW_AHBCLKCTRL0, 4 },
{ CLKID_AHB_MAC, "mac", "ahb_div",
HW_AHBCLKCTRL0, 5 },
{ CLKID_AHB_EMI, "emi", "ahb_div",
HW_AHBCLKCTRL0, 6, CLK_IGNORE_UNUSED},
{ CLKID_AHB_USB0, "usb0", "ahb_div",
HW_AHBCLKCTRL0, 7 },
{ CLKID_AHB_USB1, "usb1", "ahb_div",
HW_AHBCLKCTRL0, 8 },
{ CLKID_AHB_DMA0, "dma0", "ahb_div",
HW_AHBCLKCTRL0, 9 },
{ CLKID_AHB_DMA1, "dma1", "ahb_div",
HW_AHBCLKCTRL0, 10 },
{ CLKID_AHB_UART0, "uart0", "ahb_div",
HW_AHBCLKCTRL0, 11 },
{ CLKID_AHB_UART1, "uart1", "ahb_div",
HW_AHBCLKCTRL0, 12 },
{ CLKID_AHB_UART2, "uart2", "ahb_div",
HW_AHBCLKCTRL0, 13 },
{ CLKID_AHB_UART3, "uart3", "ahb_div",
HW_AHBCLKCTRL0, 14 },
{ CLKID_AHB_UART4, "uart4", "ahb_div",
HW_AHBCLKCTRL0, 15 },
{ CLKID_AHB_UART5, "uart5", "ahb_div",
HW_AHBCLKCTRL0, 16 },
{ CLKID_AHB_UART6, "uart6", "ahb_div",
HW_AHBCLKCTRL0, 17 },
{ CLKID_AHB_UART7, "uart7", "ahb_div",
HW_AHBCLKCTRL0, 18 },
{ CLKID_AHB_UART8, "uart8", "ahb_div",
HW_AHBCLKCTRL0, 19 },
{ CLKID_AHB_UART9, "uart9", "ahb_div",
HW_AHBCLKCTRL0, 20 },
{ CLKID_AHB_I2S0, "i2s0", "ahb_div",
HW_AHBCLKCTRL0, 21 },
{ CLKID_AHB_I2C0, "i2c0", "ahb_div",
HW_AHBCLKCTRL0, 22 },
{ CLKID_AHB_I2C1, "i2c1", "ahb_div",
HW_AHBCLKCTRL0, 23 },
{ CLKID_AHB_SSP0, "ssp0", "ahb_div",
HW_AHBCLKCTRL0, 24 },
{ CLKID_AHB_IOCONFIG, "ioconf", "ahb_div",
HW_AHBCLKCTRL0, 25 },
{ CLKID_AHB_WDT, "wdt", "ahb_div",
HW_AHBCLKCTRL0, 26 },
{ CLKID_AHB_CAN0, "can0", "ahb_div",
HW_AHBCLKCTRL0, 27 },
{ CLKID_AHB_CAN1, "can1", "ahb_div",
HW_AHBCLKCTRL0, 28 },
{ CLKID_AHB_MPWM, "mpwm", "ahb_div",
HW_AHBCLKCTRL0, 29 },
{ CLKID_AHB_SPI0, "spi0", "ahb_div",
HW_AHBCLKCTRL0, 30 },
{ CLKID_AHB_SPI1, "spi1", "ahb_div",
HW_AHBCLKCTRL0, 31 },
{ CLKID_AHB_QEI, "qei", "ahb_div",
HW_AHBCLKCTRL1, 0 },
{ CLKID_AHB_QUADSPI0, "quadspi0", "ahb_div",
HW_AHBCLKCTRL1, 1 },
{ CLKID_AHB_CAMIF, "capmif", "ahb_div",
HW_AHBCLKCTRL1, 2 },
{ CLKID_AHB_LCDIF, "lcdif", "ahb_div",
HW_AHBCLKCTRL1, 3 },
{ CLKID_AHB_TIMER0, "timer0", "ahb_div",
HW_AHBCLKCTRL1, 4 },
{ CLKID_AHB_TIMER1, "timer1", "ahb_div",
HW_AHBCLKCTRL1, 5 },
{ CLKID_AHB_TIMER2, "timer2", "ahb_div",
HW_AHBCLKCTRL1, 6 },
{ CLKID_AHB_TIMER3, "timer3", "ahb_div",
HW_AHBCLKCTRL1, 7 },
{ CLKID_AHB_IRQ, "irq", "ahb_div",
HW_AHBCLKCTRL1, 8, CLK_IGNORE_UNUSED},
{ CLKID_AHB_RTC, "rtc", "ahb_div",
HW_AHBCLKCTRL1, 9 },
{ CLKID_AHB_NAND, "nand", "ahb_div",
HW_AHBCLKCTRL1, 10 },
{ CLKID_AHB_ADC0, "adc0", "ahb_div",
HW_AHBCLKCTRL1, 11 },
{ CLKID_AHB_LED, "led", "ahb_div",
HW_AHBCLKCTRL1, 12 },
{ CLKID_AHB_DAC0, "dac0", "ahb_div",
HW_AHBCLKCTRL1, 13 },
{ CLKID_AHB_LCD, "lcd", "ahb_div",
HW_AHBCLKCTRL1, 14 },
{ CLKID_AHB_I2S1, "i2s1", "ahb_div",
HW_AHBCLKCTRL1, 15 },
{ CLKID_AHB_MAC1, "mac1", "ahb_div",
HW_AHBCLKCTRL1, 16 },
};
static const char __initdata *main_mux_p[] = { NULL, NULL };
static const char __initdata *i2s0_mux_p[] = { NULL, NULL, "i2s0m_div"};
static const char __initdata *i2s1_mux_p[] = { NULL, NULL, "i2s1m_div"};
static const char __initdata *clkout_mux_p[] = { NULL, NULL, "rtc"};
static u32 three_mux_table[] = {0, 1, 3};
static struct asm9260_mux_clock asm9260_mux_clks[] __initdata = {
{ 1, three_mux_table, "main_mux", main_mux_p,
ARRAY_SIZE(main_mux_p), HW_MAINCLKSEL, },
{ 1, three_mux_table, "uart_mux", main_mux_p,
ARRAY_SIZE(main_mux_p), HW_UARTCLKSEL, },
{ 1, three_mux_table, "wdt_mux", main_mux_p,
ARRAY_SIZE(main_mux_p), HW_WDTCLKSEL, },
{ 3, three_mux_table, "i2s0_mux", i2s0_mux_p,
ARRAY_SIZE(i2s0_mux_p), HW_I2S0CLKSEL, },
{ 3, three_mux_table, "i2s1_mux", i2s1_mux_p,
ARRAY_SIZE(i2s1_mux_p), HW_I2S1CLKSEL, },
{ 3, three_mux_table, "clkout_mux", clkout_mux_p,
ARRAY_SIZE(clkout_mux_p), HW_CLKOUTCLKSEL, },
};
static void __init asm9260_acc_init(struct device_node *np)
{
struct clk *clk;
const char *ref_clk, *pll_clk = "pll";
u32 rate;
int n;
u32 accuracy = 0;
base = of_io_request_and_map(np, 0, np->name);
if (IS_ERR(base))
panic("%s: unable to map resource", np->name);
/* register pll */
rate = (ioread32(base + HW_SYSPLLCTRL) & 0xffff) * 1000000;
ref_clk = of_clk_get_parent_name(np, 0);
accuracy = clk_get_accuracy(__clk_lookup(ref_clk));
clk = clk_register_fixed_rate_with_accuracy(NULL, pll_clk,
ref_clk, 0, rate, accuracy);
if (IS_ERR(clk))
panic("%s: can't register REFCLK. Check DT!", np->name);
for (n = 0; n < ARRAY_SIZE(asm9260_mux_clks); n++) {
const struct asm9260_mux_clock *mc = &asm9260_mux_clks[n];
mc->parent_names[0] = ref_clk;
mc->parent_names[1] = pll_clk;
clk = clk_register_mux_table(NULL, mc->name, mc->parent_names,
mc->num_parents, mc->flags, base + mc->offset,
0, mc->mask, 0, mc->table, &asm9260_clk_lock);
}
/* clock mux gate cells */
for (n = 0; n < ARRAY_SIZE(asm9260_mux_gates); n++) {
const struct asm9260_gate_data *gd = &asm9260_mux_gates[n];
clk = clk_register_gate(NULL, gd->name,
gd->parent_name, gd->flags | CLK_SET_RATE_PARENT,
base + gd->reg, gd->bit_idx, 0, &asm9260_clk_lock);
}
/* clock div cells */
for (n = 0; n < ARRAY_SIZE(asm9260_div_clks); n++) {
const struct asm9260_div_clk *dc = &asm9260_div_clks[n];
clks[dc->idx] = clk_register_divider(NULL, dc->name,
dc->parent_name, CLK_SET_RATE_PARENT,
base + dc->reg, 0, 8, CLK_DIVIDER_ONE_BASED,
&asm9260_clk_lock);
}
/* clock ahb gate cells */
for (n = 0; n < ARRAY_SIZE(asm9260_ahb_gates); n++) {
const struct asm9260_gate_data *gd = &asm9260_ahb_gates[n];
clks[gd->idx] = clk_register_gate(NULL, gd->name,
gd->parent_name, gd->flags, base + gd->reg,
gd->bit_idx, 0, &asm9260_clk_lock);
}
/* check for errors on leaf clocks */
for (n = 0; n < MAX_CLKS; n++) {
if (!IS_ERR(clks[n]))
continue;
pr_err("%s: Unable to register leaf clock %d\n",
np->full_name, n);
goto fail;
}
/* register clk-provider */
clk_data.clks = clks;
clk_data.clk_num = MAX_CLKS;
of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
return;
fail:
iounmap(base);
}
CLK_OF_DECLARE(asm9260_acc, "alphascale,asm9260-clock-controller",
asm9260_acc_init);
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